US20010050031A1 - Compositions for three-dimensional printing of solid objects - Google Patents
Compositions for three-dimensional printing of solid objects Download PDFInfo
- Publication number
- US20010050031A1 US20010050031A1 US09/835,292 US83529201A US2001050031A1 US 20010050031 A1 US20010050031 A1 US 20010050031A1 US 83529201 A US83529201 A US 83529201A US 2001050031 A1 US2001050031 A1 US 2001050031A1
- Authority
- US
- United States
- Prior art keywords
- composition
- filler
- adhesive
- particulate material
- sodium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 119
- 239000007787 solid Substances 0.000 title claims description 38
- 238000010146 3D printing Methods 0.000 title abstract description 8
- 239000000853 adhesive Substances 0.000 claims abstract description 94
- 230000001070 adhesive effect Effects 0.000 claims abstract description 94
- 239000011230 binding agent Substances 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 40
- 229920000642 polymer Polymers 0.000 claims abstract description 37
- 150000001875 compounds Chemical class 0.000 claims abstract description 36
- 239000000084 colloidal system Substances 0.000 claims abstract description 8
- 229920006317 cationic polymer Polymers 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims description 85
- 239000000945 filler Substances 0.000 claims description 60
- 239000011236 particulate material Substances 0.000 claims description 51
- 239000002904 solvent Substances 0.000 claims description 32
- 239000000178 monomer Substances 0.000 claims description 27
- 238000007639 printing Methods 0.000 claims description 25
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 21
- 229920002845 Poly(methacrylic acid) Polymers 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 17
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 16
- 235000019441 ethanol Nutrition 0.000 claims description 16
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 12
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 12
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 12
- 239000011118 polyvinyl acetate Substances 0.000 claims description 12
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 11
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 11
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 11
- 229920001467 poly(styrenesulfonates) Polymers 0.000 claims description 10
- 229920005989 resin Polymers 0.000 claims description 10
- 239000011347 resin Substances 0.000 claims description 10
- 235000002639 sodium chloride Nutrition 0.000 claims description 10
- 229940006186 sodium polystyrene sulfonate Drugs 0.000 claims description 10
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 claims description 10
- 239000004793 Polystyrene Substances 0.000 claims description 9
- PRXRUNOAOLTIEF-ADSICKODSA-N Sorbitan trioleate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OC[C@@H](OC(=O)CCCCCCC\C=C/CCCCCCCC)[C@H]1OC[C@H](O)[C@H]1OC(=O)CCCCCCC\C=C/CCCCCCCC PRXRUNOAOLTIEF-ADSICKODSA-N 0.000 claims description 9
- -1 polyoxyethylene Polymers 0.000 claims description 9
- 229920002223 polystyrene Polymers 0.000 claims description 9
- 159000000000 sodium salts Chemical class 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 229920002873 Polyethylenimine Polymers 0.000 claims description 8
- 239000004147 Sorbitan trioleate Substances 0.000 claims description 8
- DKGAVHZHDRPRBM-UHFFFAOYSA-N Tert-Butanol Chemical compound CC(C)(C)O DKGAVHZHDRPRBM-UHFFFAOYSA-N 0.000 claims description 8
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims description 8
- 229910052939 potassium sulfate Inorganic materials 0.000 claims description 8
- 235000011151 potassium sulphates Nutrition 0.000 claims description 8
- 235000019337 sorbitan trioleate Nutrition 0.000 claims description 8
- 229960000391 sorbitan trioleate Drugs 0.000 claims description 8
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 claims description 7
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
- 150000002148 esters Chemical class 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- 235000013772 propylene glycol Nutrition 0.000 claims description 7
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 claims description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 235000019270 ammonium chloride Nutrition 0.000 claims description 6
- 229910021538 borax Inorganic materials 0.000 claims description 6
- UQGFMSUEHSUPRD-UHFFFAOYSA-N disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound [Na+].[Na+].O1B([O-])OB2OB([O-])OB1O2 UQGFMSUEHSUPRD-UHFFFAOYSA-N 0.000 claims description 6
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 6
- 229920001451 polypropylene glycol Polymers 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 235000019830 sodium polyphosphate Nutrition 0.000 claims description 6
- 239000004328 sodium tetraborate Substances 0.000 claims description 6
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 6
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 claims description 5
- JTXMVXSTHSMVQF-UHFFFAOYSA-N 2-acetyloxyethyl acetate Chemical compound CC(=O)OCCOC(C)=O JTXMVXSTHSMVQF-UHFFFAOYSA-N 0.000 claims description 5
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 claims description 5
- DKMROQRQHGEIOW-UHFFFAOYSA-N Diethyl succinate Chemical compound CCOC(=O)CCC(=O)OCC DKMROQRQHGEIOW-UHFFFAOYSA-N 0.000 claims description 5
- MUXOBHXGJLMRAB-UHFFFAOYSA-N Dimethyl succinate Chemical compound COC(=O)CCC(=O)OC MUXOBHXGJLMRAB-UHFFFAOYSA-N 0.000 claims description 5
- 244000043261 Hevea brasiliensis Species 0.000 claims description 5
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- 229920000180 alkyd Polymers 0.000 claims description 5
- 239000004281 calcium formate Substances 0.000 claims description 5
- 229940044172 calcium formate Drugs 0.000 claims description 5
- 235000019255 calcium formate Nutrition 0.000 claims description 5
- 235000013773 glyceryl triacetate Nutrition 0.000 claims description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 5
- 229920003052 natural elastomer Polymers 0.000 claims description 5
- 229920001194 natural rubber Polymers 0.000 claims description 5
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 229960002622 triacetin Drugs 0.000 claims description 5
- 229920002554 vinyl polymer Polymers 0.000 claims description 5
- NYEZZYQZRQDLEH-UHFFFAOYSA-N 2-ethyl-4,5-dihydro-1,3-oxazole Chemical compound CCC1=NCCO1 NYEZZYQZRQDLEH-UHFFFAOYSA-N 0.000 claims description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- UDSFAEKRVUSQDD-UHFFFAOYSA-N Dimethyl adipate Chemical compound COC(=O)CCCCC(=O)OC UDSFAEKRVUSQDD-UHFFFAOYSA-N 0.000 claims description 4
- ULQMPOIOSDXIGC-UHFFFAOYSA-N [2,2-dimethyl-3-(2-methylprop-2-enoyloxy)propyl] 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC(C)(C)COC(=O)C(C)=C ULQMPOIOSDXIGC-UHFFFAOYSA-N 0.000 claims description 4
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 4
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 4
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 239000000378 calcium silicate Substances 0.000 claims description 4
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 4
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 239000002480 mineral oil Substances 0.000 claims description 4
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- 239000000244 polyoxyethylene sorbitan monooleate Substances 0.000 claims description 4
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 4
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 4
- ALSTYHKOOCGGFT-KTKRTIGZSA-N (9Z)-octadecen-1-ol Chemical compound CCCCCCCC\C=C/CCCCCCCCO ALSTYHKOOCGGFT-KTKRTIGZSA-N 0.000 claims description 3
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 3
- ZORQXIQZAOLNGE-UHFFFAOYSA-N 1,1-difluorocyclohexane Chemical compound FC1(F)CCCCC1 ZORQXIQZAOLNGE-UHFFFAOYSA-N 0.000 claims description 3
- VDYWHVQKENANGY-UHFFFAOYSA-N 1,3-Butyleneglycol dimethacrylate Chemical compound CC(=C)C(=O)OC(C)CCOC(=O)C(C)=C VDYWHVQKENANGY-UHFFFAOYSA-N 0.000 claims description 3
- LXOFYPKXCSULTL-UHFFFAOYSA-N 2,4,7,9-tetramethyldec-5-yne-4,7-diol Chemical class CC(C)CC(C)(O)C#CC(C)(O)CC(C)C LXOFYPKXCSULTL-UHFFFAOYSA-N 0.000 claims description 3
- LJRSZGKUUZPHEB-UHFFFAOYSA-N 2-[2-(2-prop-2-enoyloxypropoxy)propoxy]propyl prop-2-enoate Chemical compound C=CC(=O)OC(C)COC(C)COC(C)COC(=O)C=C LJRSZGKUUZPHEB-UHFFFAOYSA-N 0.000 claims description 3
- IGPIBLIHYRGADN-UHFFFAOYSA-N 2-hydroxyethyl decanoate Chemical compound CCCCCCCCCC(=O)OCCO IGPIBLIHYRGADN-UHFFFAOYSA-N 0.000 claims description 3
- CBLFQQQLPYAQCP-UHFFFAOYSA-N 2-hydroxyethyl octanoate Chemical compound CCCCCCCC(=O)OCCO CBLFQQQLPYAQCP-UHFFFAOYSA-N 0.000 claims description 3
- RZVINYQDSSQUKO-UHFFFAOYSA-N 2-phenoxyethyl prop-2-enoate Chemical compound C=CC(=O)OCCOC1=CC=CC=C1 RZVINYQDSSQUKO-UHFFFAOYSA-N 0.000 claims description 3
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 3
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical compound C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 claims description 3
- SAPGBCWOQLHKKZ-UHFFFAOYSA-N 6-(2-methylprop-2-enoyloxy)hexyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCCCOC(=O)C(C)=C SAPGBCWOQLHKKZ-UHFFFAOYSA-N 0.000 claims description 3
- XZIIFPSPUDAGJM-UHFFFAOYSA-N 6-chloro-2-n,2-n-diethylpyrimidine-2,4-diamine Chemical compound CCN(CC)C1=NC(N)=CC(Cl)=N1 XZIIFPSPUDAGJM-UHFFFAOYSA-N 0.000 claims description 3
- FIHBHSQYSYVZQE-UHFFFAOYSA-N 6-prop-2-enoyloxyhexyl prop-2-enoate Chemical compound C=CC(=O)OCCCCCCOC(=O)C=C FIHBHSQYSYVZQE-UHFFFAOYSA-N 0.000 claims description 3
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 3
- 239000005642 Oleic acid Substances 0.000 claims description 3
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 3
- 229920001800 Shellac Polymers 0.000 claims description 3
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 3
- SXQXMCWCWVCFPC-UHFFFAOYSA-N aluminum;potassium;dioxido(oxo)silane Chemical compound [Al+3].[K+].[O-][Si]([O-])=O.[O-][Si]([O-])=O SXQXMCWCWVCFPC-UHFFFAOYSA-N 0.000 claims description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 3
- 239000000920 calcium hydroxide Substances 0.000 claims description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 3
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 3
- 229910000397 disodium phosphate Inorganic materials 0.000 claims description 3
- 235000019800 disodium phosphate Nutrition 0.000 claims description 3
- MABAWBWRUSBLKQ-UHFFFAOYSA-N ethenyl-tri(propan-2-yloxy)silane Chemical compound CC(C)O[Si](OC(C)C)(OC(C)C)C=C MABAWBWRUSBLKQ-UHFFFAOYSA-N 0.000 claims description 3
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 3
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- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 3
- 229940055577 oleyl alcohol Drugs 0.000 claims description 3
- XMLQWXUVTXCDDL-UHFFFAOYSA-N oleyl alcohol Natural products CCCCCCC=CCCCCCCCCCCO XMLQWXUVTXCDDL-UHFFFAOYSA-N 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
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- 235000013874 shellac Nutrition 0.000 claims description 3
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 claims description 3
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- MLIKYFGFHUYZAL-UHFFFAOYSA-K trisodium;hydron;phosphonato phosphate Chemical compound [Na+].[Na+].[Na+].OP([O-])(=O)OP([O-])([O-])=O MLIKYFGFHUYZAL-UHFFFAOYSA-K 0.000 claims 1
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- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
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- B29C64/10—Processes of additive manufacturing
- B29C64/106—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material
- B29C64/112—Processes of additive manufacturing using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material using individual droplets, e.g. from jetting heads
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
- B29K2033/04—Polymers of esters
- B29K2033/08—Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0097—Glues or adhesives, e.g. hot melts or thermofusible adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
Definitions
- Rapid prototyping involves the production of prototype articles and small quantities of functional parts, as well as structural ceramics and ceramic shell molds for metal casting, directly from computer-generated design data.
- methods to form a three-dimensional article including a selective laser-sintering process as described in U.S. Pat. No. 4,863,568, which is incorporated herein by reference.
- Three-dimensional printing is a process invented by Sachs et al. at Massachusetts Institute of Technology in the early 1980's.
- an ink-jet printhead is used to deposit a liquid ink or binder onto a print plane composed of a powdered receiving medium.
- the combination of liquid binder and solid powder solidifies to form a finished article.
- the three-dimensional ink-jet printing technique (hereafter “liquid-binder method”) involves applying a layer of a powdered material to a surface using a counter roller. After the powdered material is applied to the surface, the ink-jet printhead delivers a liquid binder to the layer of powder. The binder infiltrates into gaps in the powder material, hardening to bond the powder material into a solidified layer. The hardened binder also bonds each layer to the previous layer.
- the binder can be suspended in a carrier that evaporates, leaving the hardened binder behind.
- the powdered material can be ceramic, metal, plastic or a composite material, and can also include fiber.
- the liquid-binder material can be organic or inorganic. Typical organic binder materials used are polymeric resins, or ceramic precursors such as polycarbosilazane. Inorganic binders are used where the binder is incorporated into the final articles; silica is typically used in such an application.
- ink-jet printing there are a number of different types of printheads distinguished by the mechanism by which ink is ejected onto the printing plane.
- the two broadest classes of printheads are called, “continuous-jet” and “drop-on-demand.”
- a continuous-jet printhead a liquid ink or binder is projected continuously through a nozzle.
- the jet is deflected alternatively onto the print plane or in to a collector that masks the printing plane.
- drop-on-demand printhead ink or binder is ejected when it is needed by sending an impulse, most usually electrical, that causes an actuator in the printhead to eject a droplet of ink or binder onto the print plane.
- liquid-binder printing techniques with a thermal (bubble) printhead can present reliability problem associated with the spray nozzle becoming clogged with the binder material. Clogging can occur when binders having high levels of solids are used. The problem with clogging requires frequent interruptions of the build in order to clean the spray nozzle; this problem also increases the time and labor required to build parts and to maintain the equipment. Therefore, although the liquid-binder printing technique represents an advance in speed and cost over the selective laser-sintering process, it suffers from reliability problems that slow down the build rate, increasing labor and equipment maintenance costs. This problem interferes with the potential speed advantage of increased printing capability presented by the plurality of spray nozzles.
- the materials for fabricating three-dimensional objects lead to a materials system and method that produce both appearance models and small numbers of functional parts in an office environment.
- the materials system can include at least one solid filler and a liquid binder composition.
- Particular binder compositions can be effectively deposited using an electromechanical printhead having suitable components.
- the fabrication methods can be quick, reliable, safe, and inexpensive.
- An article can be made of a mixture of particles including adhesive and at least one filler.
- the adhesive may be activated by a fluid including a solvent.
- the binder can also include various processing aids or additions that modify the working properties of the fluid and adhesive or that enhance the mechanical properties of the finished article.
- the mixture of particles can also optionally include particles of fiber and various processing aids.
- the activated adhesive causes the filler particles to adhere together, and to adhere to previously formed adjacent layers.
- Adhesive can be supplied to the article by coating it on the fiber and/or filler, by directly mixing it with the fiber and filler before delivering the fluid and/or by dissolving or mixing the adhesive in the fluid before the fluid is delivered to the mixture of particles.
- a particular method for producing such articles can include applying a layer of the above-mentioned mixture onto a flat surface that can be indexed downward.
- Cross-sectional portions of an article can be defined by delivering an activating fluid, the adhesive, to the layer of the mixture of particles in a predetermined two-dimensional pattern.
- the fluid activates the adhesive, and the activated adhesive causes the particles to adhere together in an essentially solid layer.
- the movable surface can be indexed downward by an amount corresponding to the desired layer thickness.
- Successive layers of the mixture of particles are applied to previous layers in the same manner.
- Application of the fluid using an electromechanical ink-jet print head follows the application of each successive layer of the mixture of particulate material.
- Depositing a layer of the mixture of particulate material and delivering the fluid to the layer can be repeated until the required number of cross-sectional portions have been built, completing formation of the article.
- After formation of the article has been completed it typically remains immersed in a bed of unbound particulate material, where it can remain until the article is completely dry.
- Delicate features of the article remain supported by the unbound particulate material while drying.
- the finished article can then be removed from the bed of unbound particulate material and any excess unbound particulate material clinging to the finished article can be removed by a suitable cleaning process.
- excess powder can be removed by vacuuming it off the article, by blowing it off the article, and by brushing to remove any powder left in crevices.
- the finished article can be placed in an oven for more rapid drying.
- optional post-processing actions can include heat-treating, resin or wax infiltration, painting and sanding.
- Heat treating and infiltration can increase the strength and durability of the finished article. Infiltration can reduce porosity, making the article water resistant and more readily sanded.
- Painting the article can provide a more aesthetically pleasing appearance, and may also contribute to the strength and water resistance of the final articles.
- Sanding improves the surface smoothness, reducing any surface irregularities caused, for example, by fiber penetrating through the surface. Parts can be glued or fastened, or used as patterns for subsequent molding operations.
- electromechanical ink-jet printheads to deliver the fluid compositions allows for the incorporation of thermally-sensitive adhesives in the fluid due to the fact that electromechanical ink-jet printheads typically operate at ambient-temperature. Further, fluids with a large amount of dissolved or suspended solids subject to degradation with temperature excursions can likewise be better accommodated by an electromechanical printhead relative to a thermal printhead.
- the use of fluids with higher solids content with an electromechanical printhead further allows for the formation of materials that will shrink less (due to fewer escaping components) and that have higher strength and greater dimensional stability than materials formed with more dilute binders. Further still, the incorporation of adhesives in the activating fluid and the delivery of that fluid to the particulate bed allows for an increased amount of adhesive to be incorporated into the final part.
- the composition selectively adhere particulate material to form a solid object in a three-dimensional printer.
- the composition comprises a nonaqueous organic monomeric compound. That compound can include at least one of an alcohol, an ester, an ether, a silane, a vinyl monomer, an acrylic monomer, or a methacrylate monomer.
- the composition can include a solvent and a solute, and in one embodiment, the compound is the solvent.
- the solvent can include an alcohol such as methyl alcohol, ethyl alcohol, isopropanol, or t-butanol.
- the solvent includes an ester that includes at least one of ethyl acetate, dimethyl succinate, diethyl succinate, dimethyl adipate, or ethylene glycol diacetate.
- the compound is a solvent for a resin in the particulate material.
- the resin can include at least one of shellac, polyvinyl pyrrolidone, polyvinyl acetate, polyvinyl alcohol, polystyrene, styrene-butadiene copolymer, or acrylonitrile-butadiene-styrene copolymer.
- organic acids and sugars such as sucrose, dextrose, malic acid, and sodium citrate, and other compounds such as urea and hydrolized amino acids can be used as solutes in water solution. These compounds bind the particulate material together by drying in the powder, and not have any appreciable solvent character on their own.
- the monomeric compound can include a mixed monomer vinyl-silane and can include vinyltriisopropoxysilane.
- the acrylic monomer can include at least one of tri(propylene glycol) diacrylate, ethylene glycol phenyl ether acrylate, or 1,6 hexanediol diacrylate.
- the methacrylic monomer can include at least one of 1,3 butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, butyl methacrylate, 1,6 hexanediol dimethacrylate, or di(propylene glycol) allyl ether methacrylate.
- the compound can be curable, in combination with a photoinitiator in a solid, by ultraviolet radiation having a wavelength between about 320-500 nm and an energy density of about 1 joule/cm 2 .
- the particulate material can include a filler that includes an inorganic compound.
- the filler includes at least one of clay, aluminum oxide, silicon dioxide, aluminum silicate, potassium aluminum silicate, calcium silicate, calcium hydroxide, calcium aluminate, calcium carbonate, sodium silicate, zinc oxide, titanium dioxide, or magnetite.
- a printing aid can be dispersed throughout the filler.
- the printing aid can include at least one of sorbitan trioleate, sorbitan mono-oleate, sorbitan monolaurate, polyoxyethylene sorbitan mono-oleate, polyethylene glycol, soybean oil, mineral oil, propylene glycol, fluroaklkyl polyoxyethylene polymers, glycerol triacetate, polypropylene glycol, ethylene glycol octanoate, ethylene glycol decanoate, ethoxylated derivatives of 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, oleyl alcohol, or oleic acid.
- a binder composition is also provided, which can include an adhesive in combination with a fluid, for selectively adhering particulate material to form a solid object in a three-dimensional printer.
- the adhesive can include a nonaqueous organic monomeric compound.
- an adhesive for selectively adhering particulate material to form a solid object in a three-dimensional printer includes an anionically ionizable polymer consisting of compounds selected from the group including polymethacrylic acid, polymethacrylic acid sodium salt, and sodium polystyrene sulfonate.
- the adhesive includes a cationic polymer such as polyethyleneimine and polydiallyldimethylammonium chloride.
- the adhesive includes a nonionic polymer.
- the polymer can include at least one of polyvinyl pyrrolidone, polyvinyl pyrrolidone copolymer with polyvinyl acetate, polyvinyl alcohol, polyvinyl methyl ether, polyacrylamide, or poly-2-ethyl-2-oxazoline.
- the adhesive includes a polymer selected from the group consisting of polymethacrylic acid, polymethacrylic acid sodium salt, sodium polystyrene sulfonate, and polyethyleneimine.
- the adhesive includes a waterborne colloid such as polymethyl methacrylate, polystyrene, natural rubber, polyurethane, polyvinyl acetate, and alkyd resins.
- the adhesive includes an inorganic solute selected from the group consisting of sodium polyphosphate, sodium tetraborate, sodium chloride, ammonium nitrate, potassium sulfate, ammonium chloride, and calcium formate.
- FIG. 1 schematically illustrates a first layer of a mixture of particulate material deposited onto a downwardly movable surface on which an article is to be built, before any fluid has been delivered;
- FIG. 2 schematically illustrates an electromechanical ink-jet nozzle delivering an activating fluid to a portion of the layer of particulate material of FIG. 1 in a predetermined pattern
- FIG. 3 schematically illustrates a view of a final article made from a series of steps illustrated in FIG. 2 enclosed in the container while it is still immersed in the loose unactivated particles;
- FIG. 4 schematically illustrates a view of the final article from FIG. 3.
- a materials system for three-dimensional printing comprises a mixture of particles including a filler and possibly an adhesive.
- the materials system can also include a fibrous component, a printing aid for reducing edge curl due to uneven curing of the adhesive and resultant distortion of a part that is three-dimensionally printed, and an activating fluid comprising additional adhesive and a solvent that activates the adhesive.
- the activating fluid can also include such processing aids as a humectant, a flowrate enhancer, and a dye. The fluid activates the adhesive in the particulate mixture, adhesively bonding the material together to form an essentially solid article.
- FIG. 1 schematically illustrates a first layer of a mixture of particulate material deposited onto a downwardly movable surface on which an article is to be built, before any fluid has been delivered.
- a layer or film of particulate material 20 is applied on a downwardly movable surface 22 of a container 24 .
- the layer or film of particulate material can be formed in any manner; in one embodiment, the particulate material is applied using a counter roller.
- the particulate material applied to the surface includes a filler and, possibly, adhesive.
- adhesive is meant to define a component that forms the primary adhesive bonds in the mixture of material between portions of the mixture that were separate prior to delivery of the activating fluid.
- the adhesive can be included both in the particle mixture and in the activating fluid.
- a “filler” is meant to define a component that is solid prior to application of the activating fluid, which is substantially less soluble in the fluid than the adhesive, and which gives structure to the final article.
- the particulate mixture includes a reinforcing fiber, or a reinforcing fibrous component, added to provide structural reinforcement to the final article.
- the particulate material may include a plurality of particles of mean diameter of about 10-300 microns.
- fiber or “fibrous component” is meant to define a component that is solid prior to application of the activating fluid, which can be but is not necessarily insoluble in the fluid, that is added to increase the final article strength.
- the reinforcing fiber length is restricted to a length approximately equal to the thickness of the layer of particulate mixture.
- the reinforcing fiber is typically about 60 to about 200 microns in length, and is included in an amount not greater than 20 percent, by weight, of the total mixture.
- a stabilizing fiber can be added to the filler to provide dimensional stability to the final article, as well as to slightly increase the article strength.
- Spreading the particulate mixture with the counter roller becomes increasingly difficult as friction caused by an excess of stabilizing fiber in the mixture increases, reducing the packing density. Restricting both the amount and length of the stabilizing fiber increases the packing density of the mixture resulting in finished parts of greater strength.
- the stabilizing fiber may be restricted to a length of less than half of the reinforcing fiber, in an amount not greater than 30 percent, by weight, of the total mixture. Optimal values can be determined with routine experimentation using, for example, a counter roller.
- a printing aid in the form of an emulsifier such as sorbitan trioleate (commercially available as SPAN 85 from Sigma Chemical Co., St. Louis, Mo. USA), can be added to the particulate mixture to prevent distortions in printing.
- the printing aid prevents fine particles of the mixture from becoming airborne while the fluid is dispensed from the print head which would distort the printed article.
- Lecithin which also serves as a printing aid can be used as well.
- composition of the particulate mixture and fluid (binder) of a particular embodiment using a polymer solution as the adhesive is provided in Table 1, below.
- composition of the particulate mixture and fluid (binder) of a particular embodiment using a colloidal suspension as the adhesive is provided in Table 2, below.
- FIG. 2 schematically illustrates an electromechanical ink-jet nozzle delivering an activating fluid to a portion of the layer of particulate material of FIG. 1 in a predetermined pattern.
- the fluid 26 is delivered to the layer or film of particulate material in any predetermined two-dimensional pattern (circular, in the figures, for purposes of illustration only), using any convenient mechanism, such as a drop-on-demand (hereinafter “DOD”) electromechanical printhead driven by customized software which receives data from a computer-assisted-design (hereinafter “CAD”) system as described in greater detail in U.S. application Ser. No. 09/416,707, which is incorporated herein by reference in its entirety.
- DOD drop-on-demand
- CAD computer-assisted-design
- piezoelectric printheads examples include the Tektronix PHASOR 340 printhead by Xerox (Stanford, Conn. USA), the PJN 320 printhead from PicoJet, Inc. (Hillsboro, Oreg. USA), and the EPSON 900 printhead from Epson America, Inc. (Portland, Oreg. USA).
- a suitable solenoid valve printhead is the 1200 Hz INKA printhead from The Lee Co. (Westbrook, Conn. USA).
- the first portion 30 of the particulate mixture is activated by the fluid, causing the activated adhesive to adhere the particles together to form an essentially-solid circular layer that becomes a cross-sectional portion of the final article.
- activates is meant to define a change in state from essentially inert to adhesive.
- a typical droplet of activating fluid has a volume of about 50 pL, and spreads to about 100 microns once it comes into contact with the particulate mixture. As the solvent dissolves the adhesive, the fluid viscosity increases dramatically, arresting further migration of the fluid from the initial point of impact.
- An adhesive can be dissolved, suspended, or otherwise included in the activating fluid before delivery, in addition to being in the powder mixture.
- the adhesive that is pre-mixed with the activating fluid will already be activated when delivered to the powder mixture and will adhere filler and other particles to form a solid, agglomerated structure, as described above.
- the fluid within a few minutes after the activating fluid is delivered to the particulate mixture, the fluid (with adhesive dissolved or suspended therein) infiltrates the less-soluble and slightly-porous particles, forming adhesive bonds between the filler and the fiber.
- the activating fluid is capable of bonding the particulate mixture in an agglomerated mass that is several times the mass of a droplet of the fluid. As volatile components of the fluid evaporate, the adhesive bonds harden, joining the filler and, optionally, fiber particulates into a rigid structure, which becomes a cross-sectional portion of the finished article.
- any portion of the particulate mixture 32 that was not exposed to the fluid remains loose and free-flowing on the movable surface.
- the unbound particulate mixture can be left in place until formation of the final article is complete. Leaving the unbound, loose-particulate mixture in place ensures that the article is supported during processing, allowing features such as overhangs, undercuts, and cavities (not illustrated, but conventional) to be defined without using support structures.
- the movable surface is indexed downward.
- a second film or layer of the particulate mixture is then applied over the first, covering both the rigid first cross-sectional portion, and any loose particulate mixture by which it is surrounded.
- a second application of fluid follows in the manner described above, forming adhesive bonds between a portion of the previous cross-sectional portion, the filler, and, optionally, fiber of the second layer, and hardening to form a second rigid cross-sectional portion added to the first rigid cross-sectional portion of the final article.
- the movable surface is again indexed downward.
- FIG. 3 schematically illustrates a view of a final article made from a series of steps illustrated in FIG. 2 enclosed in the container while it is still immersed in the loose unactivated particles.
- the final article can be completely immersed in a bed 36 of unactivated particulate material.
- those skilled in this art would know how to build an article in layers upward from an immovable platform, by successively depositing, smoothing and printing a series of such layers.
- FIG. 4 schematically illustrates a view of the final article from FIG. 3.
- the unactivated particulate material can be removed by blown air or a vacuum.
- post-processing treatment may be performed, including cleaning, infiltration with stabilizing materials, painting, etc.
- the method of the present invention is capable of producing features on the order of about 250 ⁇ m.
- the accuracy achieved by the method of the present invention is in the range of about +/ ⁇ 250 ⁇ m.
- Shrinkage of the final article is about 1%, which can easily be factored into the build to increase accuracy.
- the adhesive is a compound selected for the characteristics of high solubility in the activating fluid, low solution viscosity, low hygroscopicity, and high bonding strength.
- the adhesive should be highly soluble in the solvent in order to ensure that it is incorporated rapidly and completely into the activating fluid. Low solution viscosity can be used to ensure that activating fluid having adhesive dissolved therein will migrate quickly to sites in the powder bed to adhesively bond together the reinforcing materials. If the adhesive is naturally a solid, the adhesive can be milled as finely as possible prior to mixing with the filler and/or activating fluid and/or prior to coating the filler particles.
- the fine particle size enhances the available surface area, enhancing dissolution in the solvent, without being so fine as to cause “caking”, an undesirable article characteristic.
- Typical adhesive particle grain sizes are about 5-50 ⁇ m.
- Low hygroscopicity of an adhesive used in the particulate mixture avoids absorption of excessive moisture from the air, which causes “caking”, in which unactivated powder spuriously adheres to the outside surface of the part, resulting in poor surface definition.
- the filler of the present invention is a compound selected for the characteristics of insolubility in the activating fluid, or extremely low solubility in the activating fluid, rapid wetting, low hygroscopicity, and high bonding strength.
- the filler provides mechanical structure to the hardened composition. Sparingly soluble filler material is used in particular, although insoluble filler material can also be used.
- the filler particles become adhesively bonded together when the adhesive dries/hardens after the activating fluid has been applied.
- the filler can include a distribution of particle grain sizes, ranging from the practical maximum of about 200 ⁇ m downward, to the practical minimum of about 5 ⁇ m. Large grain sizes appear to improve the final article quality by forming large pores in the powder through which the fluid can migrate rapidly, permitting production of a more homogeneous material. Smaller grain sizes serve to reinforce article strength.
- Compounds suitable for use as the filler of the present invention can be selected from the same general groups from which the adhesive is selected, provided that the solubility, hygroscopicity, bonding strength and solution viscosity criteria described above are met.
- fillers which can be used alone or in combination, include starches such as maltodextrin, clay, cellulose fiber, glass, limestone, gypsum, aluminum oxide, aluminum silicate, potassium aluminum silicate, calcium silicate, calcium hydroxide, calcium aluminate, and sodium silicate; metals; metal oxides such as zinc oxide, titanium dioxide, and magnetite (Fe 3 O 4 ); carbides such as silicon carbide; and borides such as titanium diboride.
- the filler is limestone, which can be used alone or in combination with other inorganic fillers.
- the filler can be a combination of plaster (0-20%), limestone (calcium carbonate) (40-95%) and glass beads (0-80%).
- the filler materials are selected on the basis of their ability to bond with the adhesive components, combined with the spreading characteristics of the dry powder. The selection of the solvent also typically determines which filler can be used.
- the reinforcing fiber can be insoluble or can dissolve substantially slower in the fluid than the adhesive dissolves.
- the reinforcing fiber is a stiff material chosen to increase the mechanical reinforcement and dimensional control of the final article without making the powder too difficult to spread. In order to promote wetting of the reinforcing fibers, the chosen fibers have a high affinity for the solvent.
- a particular embodiment includes a fiber length approximately equal to the layer thickness, which provides the greatest degree of mechanical reinforcement. Using longer fibers adversely affects the surface finish, and using too much fiber of any length can make spreading of the powder increasingly difficult.
- Fibrous material suitable for reinforcing the present invention includes, but is not limited to polymeric fiber, ceramic fiber, graphite fiber and fiberglass.
- the polymeric fiber may be cellulose and cellulose derivatives or substituted or unsubstituted, straight or branched, alkyl or alkene, including monomers up to eight carbon atoms in length.
- Specific useable fibrous materials include, but are not limited to cellulose fiber, silicon carbide fiber, graphite fiber, aluminosilicate fiber, polypropylene fiber, fiberglass, nylon, and rayon.
- both the reinforcing fiber and the stabilizing fiber are can be cellulose.
- Some of the useful properties of cellulose making it particularly suitable for use in connection with the invention are low toxicity, biodegradability, low cost and availability in a wide variety of lengths.
- the final strength of the finished article depends largely on the quality of the adhesive contacts between the particles of the mixture, and the size of the empty pores that persist in the material after the adhesive has hardened; both of these factors vary with the grain size of the particulate material.
- the mean size of the grains of particulate material should not be larger than the layer thickness. A distribution of grain sizes increases the packing density of the particulate material, which in turn increases both article strength and dimensional control.
- sorbitan trioleate (SPAN 85) is used as a printing aid in the exemplary particulate mixture.
- Sorbitan trioleate is a liquid which is only slightly soluble in water. By adding a small amount to the powder, the sorbitan trioleate provides a light adhesion between powder grains before printing, thereby reducing dust formation. After printing, the sorbitan trioleate continues to adhere insoluble grains together for a short time until it dissolves. This effect tends to reduce distortion in printed layers in the brief time that is required for the adhesive to dissolve and redistribute in the powder. Hydrophillic grades of lecithin are particularly suitable. A wide variety of other liquid compounds work for the same purpose.
- Polypropylene glycol (PPG), especially with a molecular weight of about 400, and citronellol are two examples.
- Other suitable printing aides include ethylene glycol octanoate, ethylene glycol decanoate, and ethoxylated derivatives of 2,4,7,9-Tetramethyl-5-decyne-4,7-diol. Sorbitan trioleate can be used in combination with lethicin, which also functions as a printing aid.
- liquid compounds that can be used as printing aids include sorbitan mono-oleate, sorbitan monolaurate, polyoxyethylene sorbitan mono-oleate, polyethylene glycol, soybean oil, mineral oil, propylene glycol, fluroalkyl polyoxyethylene polymers, glycerol triacetate, oleyl alcohol, and oleic acid.
- the fluid of the present invention is selected to comport with the degree of solubility required for the various particulate components of the mixture, as described above.
- the fluid includes a solvent in which the adhesive is active, particularly soluble, and can include processing aids such as a humectant, a flowrate enhancer, and a dye.
- An ideal solvent is one in which the adhesive component of the powder is highly soluble, and in which both the filler and fiber are substantially less soluble.
- the solvent can be aqueous or non-aqueous, although aqueous solvents offer some advantages.
- Suitable solvents can be selected from the following non-limiting list: water, methyl alcohol, ethyl alcohol, isopropanol, t-butanol, ethyl acetate, dimethyl succinate, diethyl succinate, dimethyl adipate, and ethylene glycol diacetate.
- the activating fluid which can have adhesive pre-mixed, is also referred to as the “binder.”
- the function of the binder is to infiltrate the insoluble or semi-soluble particle mixture and to bond the grains together.
- the activating fluid, with adhesive included can belong to any one of the following classes: (1) polymer solutions, (2) colloidal suspensions, (3) inorganic (salt) solutions, (4) organic monomeric solutions, (5) non aqueous liquids. Classes 1-4 can be aqueous.
- the following description of particular fluids and adhesives are not meant to be limiting, other suitable compounds may be used in place of or in combination with the listed compounds.
- a water-soluble polymer can be dissolved in the binder to form a relatively low viscosity solution.
- a water-soluble polymer can be dissolved in the binder to form a relatively low viscosity solution.
- suitable polymers include anionically ionizable polymers, cationic polymers and nonionic polymers.
- the anionically ionizable polymers include polymethacrylic acid, polymethacrylic acid sodium salt, and sodium polystyrene sulfonate.
- the cationic polymers include polyethyleneimine and polydiallyldimethyl ammonium chloride.
- polyethyleneimine comes in two forms, linear and branched, both of which are useful.
- the nonionic soluble polymers that are particularly useful as binders are polyvinyl pyrrolidone, polyvinyl pyrrolidone copolymer with polyvinyl acetate, polyvinyl alcohol, polyvinyl methyl ether, polyacrylamide, and poly-2-ethyl-2-oxazoline.
- a low molecular weight polymer such as sodium polystyrene sulfonate is dissolved in water to form a solution containing approximately 20% solids by weight.
- a cosolvent such as isopropyl alcohol, at approximately 1% to 5% by weight, can modify the viscosity of the solution by controlling the conformation of the polymer chains in solution.
- a humectant such as glycerol used at approximately 5% to 10% will reduce the tendency of the binder to dry in the printhead.
- Other solution parameters such as pH and salt concentration may be used to modify flow properties. Added salts tend to lower the viscosity of binders that include a polyelectrolyte, such as sodium chloride, sodium phosphate, sodium sulfate, and potassium sulfate.
- colloidal suspensions of materials can be used as binders in three-dimensional printing.
- Organic latexes such as polymethyl methacrylate, polystyrene, styrenated polyacrylic acid, natural rubber, polyurethane latex, polyvinyl acetate latex, and alkyd resin latex are materials that can be applied to the process.
- inorganic suspensions such as colloidal alumina, clay, and colloidal graphite could all be used to for solid articles containing substantial amounts of these technologically important materials.
- the advantage of using a colloid over a solution is that a very large content of solid materials can be suspended without greatly increasing the viscosity of the fluid.
- the first two classes do not necessarily exclude one another. Very often, a soluble polyelectrolyte will be used to stabilize a suspension of solid particles. The polyelectrolyte will contribute to the structure of the finished article in addition to the dispersed particles.
- a typical embodiment of a colloid-based binder comprises a polyvinyl acetate including approximately 30% solids. Additional additives such as triethanolamine at 2% to 5% by weight are used to control the pH of the suspension. Additionally, a humectant such as glycerol at 5% to 10% is used to reduce the tendency of the latex to dry in the printhead during idle periods.
- inorganic solutes can be dissolved in an aqueous solvent and printed as a binder.
- Glass-forming solutes such as sodium silicate, sodium polyphosphate and sodium tetraborate can be used to deposit a ceramic binder in a finished article. This ceramic binder could be fused in a subsequent heat treatment into a glass-bonded ceramic.
- Other inorganic solutes that could be printed include sodium chloride, ammonium nitrate, and potassium sulfate, ammonium chloride, and calcium formate.
- Inorganic solutes participate in acid-base reactions.
- sodium hydrogen phosphate solution could be printed onto powdered calcium carbonate.
- the acid binder etches the alkaline powder and forms calcium phosphate that recrystallizes and cements together the grains of powder.
- sodium silicate which can be printed in a binder solution and can react with, for example, gypsum plaster to form calcium silicate.
- a solution of monomeric organic compounds can be printed through an electromechanical drop-on-demand printhead for three-dimensionally printed articles.
- monomeric organic compounds generally fall into several broad classes: alcohols, esters, ethers, silanes, vinyl monomers, acrylic monomers, and methacrylate monomers.
- Alcohols and esters that have been found to function well as the solvent phase, in addition to functioning as a solute in another solvent are: methyl alcohol, ethyl alcohol, isopropanol, t-butanol, ethyl acetate, dimethyl succinate, diethyl succinate, dimethyl adipate, and ethylene glycol diacetate. These materials act as solvents for resins in the powder bed.
- Resins that have been found to work in a 3-D printer are: shellac, polyvinyl pyrrolidone, polyvinyl acetate, polyvinyl alcohol, polystyrene, styrene-butadiene copolymer, and acrylonitrile-butadiene-styrene copolymer. These resins can be used in combination with any filler, or they can be used by themselves. A particularly suitable combination is 100% dimethyl succinate binder printed over a powder of 100% acrylonitrile-butadiene-styrene copolymer.
- the other monomers contain active sites for polymerization, and possess mixed characteristics.
- the classes of polymerizable monomers are the vinyl monomers, acrylic monomers, and methacrylate monomers.
- a exemplary mixed vinyl-silane monomer is vinyltriisopropoxysilane.
- Acrylic monomers include tri(propylene glycol) diacrylate, ethylene glycol phenyl ether acrylate, and 1,6 hexanediol diacrylate.
- Methacrylates include 1,3 butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, butyl methacrylate, 1,6 hexanediol dimethacrylate, and di(propylene glycol) allyl ether methacrylate.
- organic acids and sugars sucrose, dextrose, malic acid, and sodium citrate, and other compounds such as urea and the hydrolyzed amino acids that can be used as solutes in water solution. These compounds would bind by drying in the powder, and not have any appreciable solvent character on their own.
- reactive monomers such as melamine-formaldehyde, can be printed in a liquid solution and later polymerized by heat, by an initiator, or by actinic radiation such as ultra-violet radiation.
- the fifth class includes members that can be used with electromechanical printheads that are designed for printing molten wax, such as the Tektronix Phasor 340 printhead (which includes a temperature control).
- a room temperature solid such as wax can be used by itself or to replace water as a medium to convey the primary adhesives discussed in categories 1-4.
- the wax itself would serve as an adhesive to cement together powder particles.
- Binders formulated from these materials would be appropriate for electromechanical printheads that work at elevated temperatures. At these operating temperatures, the binder would become fluid and could then be used in the three-dimensional printing process.
- Typical wax-based binder formulations would include waxes with a low melt viscosity (less than 100 centipoise) such as different grades of natural mineral, or refined waxes. Examples include but are not limited to carnauba wax beeswax, ceresine, ozokerite, montan, orlcury wax, paraffin, and microcrystalline wax.
- the waxes can be chemically modified to include reactive groups such as alcohols, organic acids, alcohol oxazolates, and urethane derivatives.
- binder material properties such as melting point, melt viscosity, toughness and hardening rate, as well as to increase compatibility with added components, the waxes can be blended or compounded with resins, oils, and other polymers.
- Resins include polyethylene, polypropylene, polybutadiene, polyethylene oxide, polyethylene glycol, polymethyl methacrylate, poly-2-ethyl-oxazoline, polyvinylpyrrollidone, polyacrylamide, and polyvinyl alcohol.
- Adhesives in members of the first class (polymer solutions) and the second class (inorganic solutions) will often adsorb water if left exposed to ambient atmosphere. However, these adhesives will generally perform with greater reliability and efficacy if maintained in either a completely dry or wet state. By incorporating the adhesives in the liquid binder, they can thereby be maintained in a wet state and therefore exhibit the desired reliability and efficacy.
- a humectant can be included in the inventive mixture to retard evaporation of the solvent from the printed material, and to prevent drying/clogging of the printhead delivery system.
- Glycerol is a particularly suitable humectant when the solvent is aqueous.
- Other polyhydric alcohols including but not limited to ethylene glycol, diethylene glycol, and propylene glycol, are also known in the art to retard evaporation.
- Additional humectants include thiodiethanol, n-methyl pyrrolidinone, and dimethyl hydantoin.
- a flowrate enhancer can be included that has some humectant properties, but serves mainly to alter the hydrodynamic properties or wetting characteristics of the fluid to maximize the volume of fluid delivered by the printhead.
- Flowrate enhancement is thought to be a viscoelastic phenomena increasing the flow rate of the fluid, allowing thicker layers to be printed, thus allowing the final article to be built more quickly.
- Specific compounds that increase the flowrate of the fluid, either by reducing friction between the fluid and the walls of the jet, or by reducing the viscosity of the fluid include ethylene glycol diacetate and potassium aluminum sulfate.
- Suitable compounds for use as the flowrate enhancer can be selected from the following non-limiting list: tetraethylene glycol dimethylether, isopropyl alcohol, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, dodecyl dimethylammoniopropane sulfonate, glycerol triacetate, ethyl acetoacetate, and water-soluble polymers including polyvinyl pyrrolidone with a molecular weight of about 30,000 units, polyethylene glycol, polyacrylic acid, and sodium polyacrylate.
- the ionic polymers such as sodium polyacrylate
- Salts that can be used to enhance flowrate include potassium sulfate, potassium aluminum sulfate, sodium hydrogen phosphate and sodium polyphosphate.
- the fluid of the present invention can include a dye to provide a visual aid to the operator while building the article.
- the dye provides contrast between activated and unactivated powder which allows the operator to monitor the printed layers while building the article.
- the dye can be selected from the group including, but not limited to, naphthol blue-black and direct red. Other dyes that are compatible with the fluid can likewise be used.
- Cosolvents can be added to an aqueous solution to alter the viscosity of a solution by altering the solvency of the liquid for the solute.
- Long-chain molecules in solution conform themselves either into extended chains or into coiled structures. If the solvent has a high affinity for the solute, long molecules will spread out causing the viscosity of the solution to be high.
- the polymer can be come less strongly attracted to other dissolved polymer molecules, and begin to coil into compact balls. This tends to reduce the viscosity of a polymer solution and allows more polymer to be dissolved.
- Cosolvents include isopropanol, ethyl alcohol, ethylene glycol monobutyl ether, butyrolactone and acetone.
- Additives that control the pH of the binder can impart increased stability to the adhesive solutions and suspensions.
- Such materials include, but are not limited to, potassium hydroxide, ammonia, ammonium chloride, triethanolamine, sodium acetate, sodium gluconate, potassium sulfate, potassium hydrogen sulfate, sodium aluminum sulfate, and sodium tetraborate.
- Wetting agents are substances that control the surface tension of a liquid. These can be used to modify the spreading of the liquid adhesive on the surfaces of the printhead mechanism. These include, but are not limited to, sodium dodecyl sulfate, sodium di-octyl sulfosuccinate, ethyl butyrate, diethylene glycol monobutyl ether, polyethylene glycol alkyl ether, and sodium p-toluene sulfonate.
- Lubricants can be used to increase the rate at which liquid binder passes through the nozzles of a printhead.
- substances such as glycerol triacetate, polyethylene oxide, polypropylene glycol, ethyl acetoacetate, diethyl succinate, and sodium polyacrylate can be used.
- Stabilizers include emulsifiers such as sorbitan trioleate, polyoxyethylene mono-dodecyl ether, polyoxyethylene sorbitan mono-oleate, and protective colloids such as polyoxyethylene-co-polyoxypropylene, polyvinyl pyrrolidone, polyacrylic acid, gelatin, and acacia gum.
- emulsifiers such as sorbitan trioleate, polyoxyethylene mono-dodecyl ether, polyoxyethylene sorbitan mono-oleate
- protective colloids such as polyoxyethylene-co-polyoxypropylene, polyvinyl pyrrolidone, polyacrylic acid, gelatin, and acacia gum.
- the equipment used in the method of the present invention is reliable, inexpensive, and easy to maintain, making it ideal for use in an office environment.
- the materials used in the present invention are capable of achieving much better performance in 3D Printing than those presently used in the liquid binder method.
- less equipment maintenance is required, and the reliability of the equipment is increased. Therefore, methods of the present invention can involve shorter build times and less labor than prior art methods.
Abstract
A three-dimensional printing materials system and method can produce both appearance models and small numbers of functional parts in an office environment. The method can include building cross-sectional portions of a three-dimensional article, and assembling the individual cross-sectional areas in a layer-wise fashion to form a final article. The individual cross-sectional areas can be built by using an ink-jet printhead to deliver an aqueous solvent or binder to an adhesive particulate mixture, causing the particles of the mixture to adhere together, and to previous cross-sectional areas. The binder can include at least one of nonaqueous organic monomeric compound, anionically ionizable polymer, cationic polymer, polymer, waterborne colloid, or inorganic solute.
Description
- This application claims the benefit of U.S. Provisional Application Nos. 60/197,118 and 60/197,526, both filed Apr. 14, 2000. This application is related to U.S. application Ser. No. 09/234,349, filed Jan. 20, 1999, which is a divisional application of U.S. Pat. No. 5,902,441, issued May 11, 1999, and to U.S. application Ser. No. 09/416,787, which is a continuation-in-part of U.S. Pat. No. 6,007,318. The teachings of each of these references are incorporated herein by reference in their entirety.
- Rapid prototyping involves the production of prototype articles and small quantities of functional parts, as well as structural ceramics and ceramic shell molds for metal casting, directly from computer-generated design data. There are a variety of methods to form a three-dimensional article including a selective laser-sintering process as described in U.S. Pat. No. 4,863,568, which is incorporated herein by reference.
- Three-dimensional printing is a process invented by Sachs et al. at Massachusetts Institute of Technology in the early 1980's. In accordance with the process, an ink-jet printhead is used to deposit a liquid ink or binder onto a print plane composed of a powdered receiving medium. The combination of liquid binder and solid powder solidifies to form a finished article.
- U.S. Pat. No. 5,204,055, incorporated herein by reference, describes an early three-dimensional printing technique that involves the use of an ink-jet printing head to deliver a liquid or colloidal binder material to layers of powdered material. The three-dimensional ink-jet printing technique (hereafter “liquid-binder method”) involves applying a layer of a powdered material to a surface using a counter roller. After the powdered material is applied to the surface, the ink-jet printhead delivers a liquid binder to the layer of powder. The binder infiltrates into gaps in the powder material, hardening to bond the powder material into a solidified layer. The hardened binder also bonds each layer to the previous layer. After the first cross-sectional portion is formed, the previous steps are repeated, building successive cross-sectional portions until the final article is formed. Optionally, the binder can be suspended in a carrier that evaporates, leaving the hardened binder behind. The powdered material can be ceramic, metal, plastic or a composite material, and can also include fiber. The liquid-binder material can be organic or inorganic. Typical organic binder materials used are polymeric resins, or ceramic precursors such as polycarbosilazane. Inorganic binders are used where the binder is incorporated into the final articles; silica is typically used in such an application.
- In the technology of ink-jet printing, there are a number of different types of printheads distinguished by the mechanism by which ink is ejected onto the printing plane. The two broadest classes of printheads are called, “continuous-jet” and “drop-on-demand.” In a continuous-jet printhead, a liquid ink or binder is projected continuously through a nozzle. To print segmented lines, the jet is deflected alternatively onto the print plane or in to a collector that masks the printing plane. In a drop-on-demand printhead, ink or binder is ejected when it is needed by sending an impulse, most usually electrical, that causes an actuator in the printhead to eject a droplet of ink or binder onto the print plane.
- The use of liquid-binder printing techniques with a thermal (bubble) printhead can present reliability problem associated with the spray nozzle becoming clogged with the binder material. Clogging can occur when binders having high levels of solids are used. The problem with clogging requires frequent interruptions of the build in order to clean the spray nozzle; this problem also increases the time and labor required to build parts and to maintain the equipment. Therefore, although the liquid-binder printing technique represents an advance in speed and cost over the selective laser-sintering process, it suffers from reliability problems that slow down the build rate, increasing labor and equipment maintenance costs. This problem interferes with the potential speed advantage of increased printing capability presented by the plurality of spray nozzles.
- The materials for fabricating three-dimensional objects lead to a materials system and method that produce both appearance models and small numbers of functional parts in an office environment. The materials system can include at least one solid filler and a liquid binder composition. Particular binder compositions can be effectively deposited using an electromechanical printhead having suitable components. The fabrication methods can be quick, reliable, safe, and inexpensive.
- An article can be made of a mixture of particles including adhesive and at least one filler. The adhesive may be activated by a fluid including a solvent. Optionally, the binder can also include various processing aids or additions that modify the working properties of the fluid and adhesive or that enhance the mechanical properties of the finished article. The mixture of particles can also optionally include particles of fiber and various processing aids. The activated adhesive causes the filler particles to adhere together, and to adhere to previously formed adjacent layers. Adhesive can be supplied to the article by coating it on the fiber and/or filler, by directly mixing it with the fiber and filler before delivering the fluid and/or by dissolving or mixing the adhesive in the fluid before the fluid is delivered to the mixture of particles.
- A particular method for producing such articles can include applying a layer of the above-mentioned mixture onto a flat surface that can be indexed downward. Cross-sectional portions of an article can be defined by delivering an activating fluid, the adhesive, to the layer of the mixture of particles in a predetermined two-dimensional pattern. The fluid activates the adhesive, and the activated adhesive causes the particles to adhere together in an essentially solid layer. After the first cross-sectional portion of the article is formed, the movable surface can be indexed downward by an amount corresponding to the desired layer thickness. Successive layers of the mixture of particles are applied to previous layers in the same manner. Application of the fluid using an electromechanical ink-jet print head follows the application of each successive layer of the mixture of particulate material.
- Depositing a layer of the mixture of particulate material and delivering the fluid to the layer can be repeated until the required number of cross-sectional portions have been built, completing formation of the article. After formation of the article has been completed, it typically remains immersed in a bed of unbound particulate material, where it can remain until the article is completely dry. Delicate features of the article remain supported by the unbound particulate material while drying. The finished article can then be removed from the bed of unbound particulate material and any excess unbound particulate material clinging to the finished article can be removed by a suitable cleaning process. For example, excess powder can be removed by vacuuming it off the article, by blowing it off the article, and by brushing to remove any powder left in crevices. In addition, the finished article can be placed in an oven for more rapid drying.
- After cleaning, optional post-processing actions can include heat-treating, resin or wax infiltration, painting and sanding. Heat treating and infiltration can increase the strength and durability of the finished article. Infiltration can reduce porosity, making the article water resistant and more readily sanded. Painting the article can provide a more aesthetically pleasing appearance, and may also contribute to the strength and water resistance of the final articles. Sanding improves the surface smoothness, reducing any surface irregularities caused, for example, by fiber penetrating through the surface. Parts can be glued or fastened, or used as patterns for subsequent molding operations.
- Various materials systems and methods offer the advantages of being able to fabricate relatively complex shapes reliably, quickly, safely and inexpensively compared to the selective laser-sintering and liquid-binder methods. Because various materials used in the present system present little or no problems with clogging, higher reliability can be offered relative to prior art methods, particularly prior art methods in which high levels of suspended solids are contained in the binder. The higher reliability results in reduced build times compared with prior art methods. Further, embodiments can be made and practiced more economically than prior art methods because inexpensive equipment and materials can be used, and the high reliability associated with materials and methods reduces cost even further. In addition, because non-toxic materials can be used, these methods can be carried out safely in a typical office environment.
- Additionally, the use of electromechanical ink-jet printheads to deliver the fluid compositions allows for the incorporation of thermally-sensitive adhesives in the fluid due to the fact that electromechanical ink-jet printheads typically operate at ambient-temperature. Further, fluids with a large amount of dissolved or suspended solids subject to degradation with temperature excursions can likewise be better accommodated by an electromechanical printhead relative to a thermal printhead. The use of fluids with higher solids content with an electromechanical printhead further allows for the formation of materials that will shrink less (due to fewer escaping components) and that have higher strength and greater dimensional stability than materials formed with more dilute binders. Further still, the incorporation of adhesives in the activating fluid and the delivery of that fluid to the particulate bed allows for an increased amount of adhesive to be incorporated into the final part.
- The composition selectively adhere particulate material to form a solid object in a three-dimensional printer. In one embodiment, the composition comprises a nonaqueous organic monomeric compound. That compound can include at least one of an alcohol, an ester, an ether, a silane, a vinyl monomer, an acrylic monomer, or a methacrylate monomer.
- The composition can include a solvent and a solute, and in one embodiment, the compound is the solvent. The solvent can include an alcohol such as methyl alcohol, ethyl alcohol, isopropanol, or t-butanol. In alternative embodiments, the solvent includes an ester that includes at least one of ethyl acetate, dimethyl succinate, diethyl succinate, dimethyl adipate, or ethylene glycol diacetate.
- In alternative embodiments, the compound is a solvent for a resin in the particulate material. The resin can include at least one of shellac, polyvinyl pyrrolidone, polyvinyl acetate, polyvinyl alcohol, polystyrene, styrene-butadiene copolymer, or acrylonitrile-butadiene-styrene copolymer.
- Additionally, organic acids and sugars such as sucrose, dextrose, malic acid, and sodium citrate, and other compounds such as urea and hydrolized amino acids can be used as solutes in water solution. These compounds bind the particulate material together by drying in the powder, and not have any appreciable solvent character on their own.
- The monomeric compound can include a mixed monomer vinyl-silane and can include vinyltriisopropoxysilane.
- The acrylic monomer can include at least one of tri(propylene glycol) diacrylate, ethylene glycol phenyl ether acrylate, or 1,6 hexanediol diacrylate. The methacrylic monomer can include at least one of 1,3 butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, butyl methacrylate, 1,6 hexanediol dimethacrylate, or di(propylene glycol) allyl ether methacrylate.
- The compound can be curable, in combination with a photoinitiator in a solid, by ultraviolet radiation having a wavelength between about 320-500 nm and an energy density of about 1 joule/cm2.
- The particulate material can include a filler that includes an inorganic compound. In one embodiment, the filler includes at least one of clay, aluminum oxide, silicon dioxide, aluminum silicate, potassium aluminum silicate, calcium silicate, calcium hydroxide, calcium aluminate, calcium carbonate, sodium silicate, zinc oxide, titanium dioxide, or magnetite. A printing aid can be dispersed throughout the filler. The printing aid can include at least one of sorbitan trioleate, sorbitan mono-oleate, sorbitan monolaurate, polyoxyethylene sorbitan mono-oleate, polyethylene glycol, soybean oil, mineral oil, propylene glycol, fluroaklkyl polyoxyethylene polymers, glycerol triacetate, polypropylene glycol, ethylene glycol octanoate, ethylene glycol decanoate, ethoxylated derivatives of 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, oleyl alcohol, or oleic acid.
- A binder composition is also provided, which can include an adhesive in combination with a fluid, for selectively adhering particulate material to form a solid object in a three-dimensional printer. In one embodiment, the adhesive can include a nonaqueous organic monomeric compound.
- In alternative embodiments, an adhesive for selectively adhering particulate material to form a solid object in a three-dimensional printer includes an anionically ionizable polymer consisting of compounds selected from the group including polymethacrylic acid, polymethacrylic acid sodium salt, and sodium polystyrene sulfonate.
- In other embodiments, the adhesive includes a cationic polymer such as polyethyleneimine and polydiallyldimethylammonium chloride. In other embodiments, the adhesive includes a nonionic polymer. The polymer can include at least one of polyvinyl pyrrolidone, polyvinyl pyrrolidone copolymer with polyvinyl acetate, polyvinyl alcohol, polyvinyl methyl ether, polyacrylamide, or poly-2-ethyl-2-oxazoline. In yet other embodiments, the adhesive includes a polymer selected from the group consisting of polymethacrylic acid, polymethacrylic acid sodium salt, sodium polystyrene sulfonate, and polyethyleneimine.
- In further embodiments, the adhesive includes a waterborne colloid such as polymethyl methacrylate, polystyrene, natural rubber, polyurethane, polyvinyl acetate, and alkyd resins. In yet other embodiments, the adhesive includes an inorganic solute selected from the group consisting of sodium polyphosphate, sodium tetraborate, sodium chloride, ammonium nitrate, potassium sulfate, ammonium chloride, and calcium formate.
- FIG. 1 schematically illustrates a first layer of a mixture of particulate material deposited onto a downwardly movable surface on which an article is to be built, before any fluid has been delivered;
- FIG. 2 schematically illustrates an electromechanical ink-jet nozzle delivering an activating fluid to a portion of the layer of particulate material of FIG. 1 in a predetermined pattern;
- FIG. 3 schematically illustrates a view of a final article made from a series of steps illustrated in FIG. 2 enclosed in the container while it is still immersed in the loose unactivated particles;
- FIG. 4 schematically illustrates a view of the final article from FIG. 3.
- The foregoing and other objects, features and advantages will be apparent from the following more particular description of embodiments, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
- A materials system for three-dimensional printing comprises a mixture of particles including a filler and possibly an adhesive. The materials system can also include a fibrous component, a printing aid for reducing edge curl due to uneven curing of the adhesive and resultant distortion of a part that is three-dimensionally printed, and an activating fluid comprising additional adhesive and a solvent that activates the adhesive. The activating fluid can also include such processing aids as a humectant, a flowrate enhancer, and a dye. The fluid activates the adhesive in the particulate mixture, adhesively bonding the material together to form an essentially solid article.
- FIG. 1 schematically illustrates a first layer of a mixture of particulate material deposited onto a downwardly movable surface on which an article is to be built, before any fluid has been delivered. According to the method, a layer or film of
particulate material 20 is applied on a downwardlymovable surface 22 of acontainer 24. The layer or film of particulate material can be formed in any manner; in one embodiment, the particulate material is applied using a counter roller. The particulate material applied to the surface includes a filler and, possibly, adhesive. - As used herein, “adhesive” is meant to define a component that forms the primary adhesive bonds in the mixture of material between portions of the mixture that were separate prior to delivery of the activating fluid. The adhesive can be included both in the particle mixture and in the activating fluid. As used herein, a “filler” is meant to define a component that is solid prior to application of the activating fluid, which is substantially less soluble in the fluid than the adhesive, and which gives structure to the final article.
- According to a particular embodiment, the particulate mixture includes a reinforcing fiber, or a reinforcing fibrous component, added to provide structural reinforcement to the final article. The particulate material may include a plurality of particles of mean diameter of about 10-300 microns. As used herein, “fiber” or “fibrous component” is meant to define a component that is solid prior to application of the activating fluid, which can be but is not necessarily insoluble in the fluid, that is added to increase the final article strength. The reinforcing fiber length is restricted to a length approximately equal to the thickness of the layer of particulate mixture. The reinforcing fiber is typically about 60 to about 200 microns in length, and is included in an amount not greater than 20 percent, by weight, of the total mixture.
- Additionally, a stabilizing fiber can be added to the filler to provide dimensional stability to the final article, as well as to slightly increase the article strength. Spreading the particulate mixture with the counter roller becomes increasingly difficult as friction caused by an excess of stabilizing fiber in the mixture increases, reducing the packing density. Restricting both the amount and length of the stabilizing fiber increases the packing density of the mixture resulting in finished parts of greater strength. The stabilizing fiber may be restricted to a length of less than half of the reinforcing fiber, in an amount not greater than 30 percent, by weight, of the total mixture. Optimal values can be determined with routine experimentation using, for example, a counter roller.
- According to another particular embodiment, a printing aid in the form of an emulsifier, such as sorbitan trioleate (commercially available as SPAN 85 from Sigma Chemical Co., St. Louis, Mo. USA), can be added to the particulate mixture to prevent distortions in printing. The printing aid prevents fine particles of the mixture from becoming airborne while the fluid is dispensed from the print head which would distort the printed article. Lecithin, which also serves as a printing aid can be used as well.
- The composition of the particulate mixture and fluid (binder) of a particular embodiment using a polymer solution as the adhesive is provided in Table 1, below. The composition of the particulate mixture and fluid (binder) of a particular embodiment using a colloidal suspension as the adhesive is provided in Table 2, below.
TABLE 1 Example Example Particle Particular Composition Composition Size Ingredient Compound Range (W/W) (W/W) Range (μm) Particulate Mixture Adhesive sucrose 10-50% 30% 10 Reinforcing cellulose 0-20% 10% 100 Fiber Filler maltodextrin 0-80% 50% <300 (dextrose equivalent = 5) Stabilizing cellulose 0-30% 10% 60 Fiber Printing lecithin 0-3% 0.27% N/A Aids sorbitan 0-3% 0.03% N/A trioleate Fluid Solvent water 20-88% 68% N/A Solvent isopropyl 0-5% 1% N/A alcohol water-sol. sulfonated 10-50% 25% N/A adhesive polystyrene Humectant glycerol 0-15% 5% N/A Flowrate diethylene 0-10% 1% N/A Enhancer glycol mono- butyl ether Dye naphthol 0-0.1% 0.1% N/A blue-black -
TABLE 2 Example Example Particle Particular Composition Composition Size Ingredient Compound Range (W/W) (W/W) Range (μm) Particulate Mixture Adhesive sucrose 10-50% 30% 10 Reinforcing cellulose 0-20% 10% 100 Fiber Filler maltodextrin 0-80% 50% <300 (dextrose equivalent = 5) Stabilizing cellulose 0-30% 10% 60 Fiber Printing lecithin 0-3% 0.27% N/A Aids sorbitan 0-3% 0.03% N/A trioleate Fluid Suspending water 20-88% 72% N/A Fluid Solvent isopropyl 0-5% 1% N/A alcohol Colloid polyvinyl 10-50% 20% 50-500 nm Adhesive acetate Inorganic acetic acid 0-2% 1% N/A Buffer Humectant glycerol 0-15% 5% N/A Flowrate diethylene 0-10% 1% N/A Enhancer glycol mono- butyl ether Dye naphthol 0-0.1% 0.1% N/A blue-black - FIG. 2 schematically illustrates an electromechanical ink-jet nozzle delivering an activating fluid to a portion of the layer of particulate material of FIG. 1 in a predetermined pattern. The fluid26 is delivered to the layer or film of particulate material in any predetermined two-dimensional pattern (circular, in the figures, for purposes of illustration only), using any convenient mechanism, such as a drop-on-demand (hereinafter “DOD”) electromechanical printhead driven by customized software which receives data from a computer-assisted-design (hereinafter “CAD”) system as described in greater detail in U.S. application Ser. No. 09/416,707, which is incorporated herein by reference in its entirety. Examples of suitable piezoelectric printheads include the Tektronix PHASOR 340 printhead by Xerox (Stanford, Conn. USA), the PJN 320 printhead from PicoJet, Inc. (Hillsboro, Oreg. USA), and the EPSON 900 printhead from Epson America, Inc. (Portland, Oreg. USA). A suitable solenoid valve printhead is the 1200 Hz INKA printhead from The Lee Co. (Westbrook, Conn. USA).
- In one embodiment, where adhesive is mixed with the other particles, the
first portion 30 of the particulate mixture is activated by the fluid, causing the activated adhesive to adhere the particles together to form an essentially-solid circular layer that becomes a cross-sectional portion of the final article. As used herein, “activates” is meant to define a change in state from essentially inert to adhesive. When the fluid initially comes into contact with the particulate mixture, it immediately flows outward (on the microscopic scale) from the point of impact by capillary action, dissolving the adhesive in the particulate mixture within the first few seconds. A typical droplet of activating fluid has a volume of about 50 pL, and spreads to about 100 microns once it comes into contact with the particulate mixture. As the solvent dissolves the adhesive, the fluid viscosity increases dramatically, arresting further migration of the fluid from the initial point of impact. - An adhesive can be dissolved, suspended, or otherwise included in the activating fluid before delivery, in addition to being in the powder mixture. The adhesive that is pre-mixed with the activating fluid will already be activated when delivered to the powder mixture and will adhere filler and other particles to form a solid, agglomerated structure, as described above.
- Within a few minutes after the activating fluid is delivered to the particulate mixture, the fluid (with adhesive dissolved or suspended therein) infiltrates the less-soluble and slightly-porous particles, forming adhesive bonds between the filler and the fiber. The activating fluid is capable of bonding the particulate mixture in an agglomerated mass that is several times the mass of a droplet of the fluid. As volatile components of the fluid evaporate, the adhesive bonds harden, joining the filler and, optionally, fiber particulates into a rigid structure, which becomes a cross-sectional portion of the finished article.
- Any portion of the
particulate mixture 32 that was not exposed to the fluid remains loose and free-flowing on the movable surface. The unbound particulate mixture can be left in place until formation of the final article is complete. Leaving the unbound, loose-particulate mixture in place ensures that the article is supported during processing, allowing features such as overhangs, undercuts, and cavities (not illustrated, but conventional) to be defined without using support structures. After formation of the first cross-sectional portion of the final article, the movable surface is indexed downward. - Using, for example, a counter-rolling mechanism, a second film or layer of the particulate mixture is then applied over the first, covering both the rigid first cross-sectional portion, and any loose particulate mixture by which it is surrounded. A second application of fluid follows in the manner described above, forming adhesive bonds between a portion of the previous cross-sectional portion, the filler, and, optionally, fiber of the second layer, and hardening to form a second rigid cross-sectional portion added to the first rigid cross-sectional portion of the final article. The movable surface is again indexed downward.
- The previous steps of applying a layer of particulate mixture, applying the fluid, and indexing the movable surface downward are repeated until the final article is completed.
- FIG. 3 schematically illustrates a view of a final article made from a series of steps illustrated in FIG. 2 enclosed in the container while it is still immersed in the loose unactivated particles. The final article can be completely immersed in a
bed 36 of unactivated particulate material. Alternatively, those skilled in this art would know how to build an article in layers upward from an immovable platform, by successively depositing, smoothing and printing a series of such layers. - FIG. 4 schematically illustrates a view of the final article from FIG. 3. The unactivated particulate material can be removed by blown air or a vacuum. After removal of the unactivated particulate material from the
final article 38, post-processing treatment may be performed, including cleaning, infiltration with stabilizing materials, painting, etc. - The method of the present invention is capable of producing features on the order of about 250 μm. The accuracy achieved by the method of the present invention is in the range of about +/−250 μm. Shrinkage of the final article is about 1%, which can easily be factored into the build to increase accuracy.
- The adhesive is a compound selected for the characteristics of high solubility in the activating fluid, low solution viscosity, low hygroscopicity, and high bonding strength. The adhesive should be highly soluble in the solvent in order to ensure that it is incorporated rapidly and completely into the activating fluid. Low solution viscosity can be used to ensure that activating fluid having adhesive dissolved therein will migrate quickly to sites in the powder bed to adhesively bond together the reinforcing materials. If the adhesive is naturally a solid, the adhesive can be milled as finely as possible prior to mixing with the filler and/or activating fluid and/or prior to coating the filler particles. The fine particle size enhances the available surface area, enhancing dissolution in the solvent, without being so fine as to cause “caking”, an undesirable article characteristic. Typical adhesive particle grain sizes are about 5-50 μm. Low hygroscopicity of an adhesive used in the particulate mixture avoids absorption of excessive moisture from the air, which causes “caking”, in which unactivated powder spuriously adheres to the outside surface of the part, resulting in poor surface definition.
- Various types of adhesives that can be used with this invention are further and more specifically described under the section entitled, “Activating Fluid,” below.
- The filler of the present invention is a compound selected for the characteristics of insolubility in the activating fluid, or extremely low solubility in the activating fluid, rapid wetting, low hygroscopicity, and high bonding strength. The filler provides mechanical structure to the hardened composition. Sparingly soluble filler material is used in particular, although insoluble filler material can also be used. The filler particles become adhesively bonded together when the adhesive dries/hardens after the activating fluid has been applied. The filler can include a distribution of particle grain sizes, ranging from the practical maximum of about 200 μm downward, to the practical minimum of about 5 μm. Large grain sizes appear to improve the final article quality by forming large pores in the powder through which the fluid can migrate rapidly, permitting production of a more homogeneous material. Smaller grain sizes serve to reinforce article strength.
- Compounds suitable for use as the filler of the present invention can be selected from the same general groups from which the adhesive is selected, provided that the solubility, hygroscopicity, bonding strength and solution viscosity criteria described above are met. Examples of such fillers, which can be used alone or in combination, include starches such as maltodextrin, clay, cellulose fiber, glass, limestone, gypsum, aluminum oxide, aluminum silicate, potassium aluminum silicate, calcium silicate, calcium hydroxide, calcium aluminate, and sodium silicate; metals; metal oxides such as zinc oxide, titanium dioxide, and magnetite (Fe3O4); carbides such as silicon carbide; and borides such as titanium diboride. In other embodiments, the filler is limestone, which can be used alone or in combination with other inorganic fillers. For example, the filler can be a combination of plaster (0-20%), limestone (calcium carbonate) (40-95%) and glass beads (0-80%). Generally the filler materials are selected on the basis of their ability to bond with the adhesive components, combined with the spreading characteristics of the dry powder. The selection of the solvent also typically determines which filler can be used.
- The reinforcing fiber can be insoluble or can dissolve substantially slower in the fluid than the adhesive dissolves. The reinforcing fiber is a stiff material chosen to increase the mechanical reinforcement and dimensional control of the final article without making the powder too difficult to spread. In order to promote wetting of the reinforcing fibers, the chosen fibers have a high affinity for the solvent. A particular embodiment includes a fiber length approximately equal to the layer thickness, which provides the greatest degree of mechanical reinforcement. Using longer fibers adversely affects the surface finish, and using too much fiber of any length can make spreading of the powder increasingly difficult. Fibrous material suitable for reinforcing the present invention includes, but is not limited to polymeric fiber, ceramic fiber, graphite fiber and fiberglass. The polymeric fiber may be cellulose and cellulose derivatives or substituted or unsubstituted, straight or branched, alkyl or alkene, including monomers up to eight carbon atoms in length. Specific useable fibrous materials include, but are not limited to cellulose fiber, silicon carbide fiber, graphite fiber, aluminosilicate fiber, polypropylene fiber, fiberglass, nylon, and rayon.
- As indicated in Table 1, both the reinforcing fiber and the stabilizing fiber are can be cellulose. Some of the useful properties of cellulose making it particularly suitable for use in connection with the invention are low toxicity, biodegradability, low cost and availability in a wide variety of lengths.
- Further considerations when selecting the adhesive, filler and fiber depend on the desired properties of the final article. The final strength of the finished article depends largely on the quality of the adhesive contacts between the particles of the mixture, and the size of the empty pores that persist in the material after the adhesive has hardened; both of these factors vary with the grain size of the particulate material. In general, the mean size of the grains of particulate material should not be larger than the layer thickness. A distribution of grain sizes increases the packing density of the particulate material, which in turn increases both article strength and dimensional control.
- As indicated in Table 1, sorbitan trioleate (SPAN 85) is used as a printing aid in the exemplary particulate mixture. Sorbitan trioleate is a liquid which is only slightly soluble in water. By adding a small amount to the powder, the sorbitan trioleate provides a light adhesion between powder grains before printing, thereby reducing dust formation. After printing, the sorbitan trioleate continues to adhere insoluble grains together for a short time until it dissolves. This effect tends to reduce distortion in printed layers in the brief time that is required for the adhesive to dissolve and redistribute in the powder. Hydrophillic grades of lecithin are particularly suitable. A wide variety of other liquid compounds work for the same purpose. Polypropylene glycol (PPG), especially with a molecular weight of about 400, and citronellol are two examples. Other suitable printing aides include ethylene glycol octanoate, ethylene glycol decanoate, and ethoxylated derivatives of 2,4,7,9-Tetramethyl-5-decyne-4,7-diol. Sorbitan trioleate can be used in combination with lethicin, which also functions as a printing aid. Other liquid compounds that can be used as printing aids include sorbitan mono-oleate, sorbitan monolaurate, polyoxyethylene sorbitan mono-oleate, polyethylene glycol, soybean oil, mineral oil, propylene glycol, fluroalkyl polyoxyethylene polymers, glycerol triacetate, oleyl alcohol, and oleic acid.
- The fluid of the present invention is selected to comport with the degree of solubility required for the various particulate components of the mixture, as described above. The fluid includes a solvent in which the adhesive is active, particularly soluble, and can include processing aids such as a humectant, a flowrate enhancer, and a dye. An ideal solvent is one in which the adhesive component of the powder is highly soluble, and in which both the filler and fiber are substantially less soluble. The solvent can be aqueous or non-aqueous, although aqueous solvents offer some advantages. Suitable solvents can be selected from the following non-limiting list: water, methyl alcohol, ethyl alcohol, isopropanol, t-butanol, ethyl acetate, dimethyl succinate, diethyl succinate, dimethyl adipate, and ethylene glycol diacetate.
- The activating fluid, which can have adhesive pre-mixed, is also referred to as the “binder.” The function of the binder is to infiltrate the insoluble or semi-soluble particle mixture and to bond the grains together. The activating fluid, with adhesive included, can belong to any one of the following classes: (1) polymer solutions, (2) colloidal suspensions, (3) inorganic (salt) solutions, (4) organic monomeric solutions, (5) non aqueous liquids. Classes 1-4 can be aqueous. The following description of particular fluids and adhesives are not meant to be limiting, other suitable compounds may be used in place of or in combination with the listed compounds.
- There also exists a collection of water-based compounds that have been found to work particularly well in electromechanical printheads. In the first category, a water-soluble polymer can be dissolved in the binder to form a relatively low viscosity solution. Of these, there are a few particularly suitable polymers. These are anionically ionizable polymers, cationic polymers and nonionic polymers. The anionically ionizable polymers include polymethacrylic acid, polymethacrylic acid sodium salt, and sodium polystyrene sulfonate. The cationic polymers include polyethyleneimine and polydiallyldimethyl ammonium chloride. As a class, polyethyleneimine comes in two forms, linear and branched, both of which are useful. The nonionic soluble polymers that are particularly useful as binders are polyvinyl pyrrolidone, polyvinyl pyrrolidone copolymer with polyvinyl acetate, polyvinyl alcohol, polyvinyl methyl ether, polyacrylamide, and poly-2-ethyl-2-oxazoline.
- In a typical embodiment, a low molecular weight polymer such as sodium polystyrene sulfonate is dissolved in water to form a solution containing approximately 20% solids by weight. A cosolvent such as isopropyl alcohol, at approximately 1% to 5% by weight, can modify the viscosity of the solution by controlling the conformation of the polymer chains in solution. A humectant such as glycerol used at approximately 5% to 10% will reduce the tendency of the binder to dry in the printhead. Other solution parameters such as pH and salt concentration may be used to modify flow properties. Added salts tend to lower the viscosity of binders that include a polyelectrolyte, such as sodium chloride, sodium phosphate, sodium sulfate, and potassium sulfate.
- In the second category, colloidal suspensions of materials can be used as binders in three-dimensional printing. Organic latexes such as polymethyl methacrylate, polystyrene, styrenated polyacrylic acid, natural rubber, polyurethane latex, polyvinyl acetate latex, and alkyd resin latex are materials that can be applied to the process. Additionally, inorganic suspensions such as colloidal alumina, clay, and colloidal graphite could all be used to for solid articles containing substantial amounts of these technologically important materials. The advantage of using a colloid over a solution is that a very large content of solid materials can be suspended without greatly increasing the viscosity of the fluid.
- The first two classes do not necessarily exclude one another. Very often, a soluble polyelectrolyte will be used to stabilize a suspension of solid particles. The polyelectrolyte will contribute to the structure of the finished article in addition to the dispersed particles.
- A typical embodiment of a colloid-based binder comprises a polyvinyl acetate including approximately 30% solids. Additional additives such as triethanolamine at 2% to 5% by weight are used to control the pH of the suspension. Additionally, a humectant such as glycerol at 5% to 10% is used to reduce the tendency of the latex to dry in the printhead during idle periods.
- In the third category, inorganic solutes can be dissolved in an aqueous solvent and printed as a binder. Glass-forming solutes such as sodium silicate, sodium polyphosphate and sodium tetraborate can be used to deposit a ceramic binder in a finished article. This ceramic binder could be fused in a subsequent heat treatment into a glass-bonded ceramic. Other inorganic solutes that could be printed include sodium chloride, ammonium nitrate, and potassium sulfate, ammonium chloride, and calcium formate.
- Inorganic solutes participate in acid-base reactions. For example, sodium hydrogen phosphate solution could be printed onto powdered calcium carbonate. The acid binder etches the alkaline powder and forms calcium phosphate that recrystallizes and cements together the grains of powder. Another example is sodium silicate, which can be printed in a binder solution and can react with, for example, gypsum plaster to form calcium silicate.
- In the fourth category, a solution of monomeric organic compounds can be printed through an electromechanical drop-on-demand printhead for three-dimensionally printed articles. These monomeric organic compounds generally fall into several broad classes: alcohols, esters, ethers, silanes, vinyl monomers, acrylic monomers, and methacrylate monomers.
- Alcohols and esters that have been found to function well as the solvent phase, in addition to functioning as a solute in another solvent (usually water) are: methyl alcohol, ethyl alcohol, isopropanol, t-butanol, ethyl acetate, dimethyl succinate, diethyl succinate, dimethyl adipate, and ethylene glycol diacetate. These materials act as solvents for resins in the powder bed.
- Resins that have been found to work in a 3-D printer are: shellac, polyvinyl pyrrolidone, polyvinyl acetate, polyvinyl alcohol, polystyrene, styrene-butadiene copolymer, and acrylonitrile-butadiene-styrene copolymer. These resins can be used in combination with any filler, or they can be used by themselves. A particularly suitable combination is 100% dimethyl succinate binder printed over a powder of 100% acrylonitrile-butadiene-styrene copolymer.
- The other monomers contain active sites for polymerization, and possess mixed characteristics. The classes of polymerizable monomers are the vinyl monomers, acrylic monomers, and methacrylate monomers. A exemplary mixed vinyl-silane monomer is vinyltriisopropoxysilane. Acrylic monomers include tri(propylene glycol) diacrylate, ethylene glycol phenyl ether acrylate, and 1,6 hexanediol diacrylate. Methacrylates include 1,3 butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, butyl methacrylate, 1,6 hexanediol dimethacrylate, and di(propylene glycol) allyl ether methacrylate.
- In addition, there are some proprietary monomers of unknown character that have been found to print well. These are manufactured by Sartomer Co. of Exton, Pa., with designations SR 521, SR 516, and CN 131. These materials are reactive, and when mixed with a photoinitiator, they can be solidified by applying ultraviolet radiation. A particularly suitable binder formula for this polymerizable class is 99% neopentyl glycol dimethacrylate mixed with 1% of Sartomer product # KT046 as a photoinitiator. Any of the above-listed monomers can be made to work, but this formula yields a suitable flow through the printhead and suitable reactivity. The radiation necessary to cure these materials is ultraviolet light with a wavelength of 363-378 nm and an energy density of 1 joule/cm2. A particularly suitable powder formula for this mixture is given in Table 1, above.
- Additionally, there are organic acids and sugars: sucrose, dextrose, malic acid, and sodium citrate, and other compounds such as urea and the hydrolyzed amino acids that can be used as solutes in water solution. These compounds would bind by drying in the powder, and not have any appreciable solvent character on their own. In addition, reactive monomers, such as melamine-formaldehyde, can be printed in a liquid solution and later polymerized by heat, by an initiator, or by actinic radiation such as ultra-violet radiation.
- The fifth class includes members that can be used with electromechanical printheads that are designed for printing molten wax, such as the Tektronix Phasor 340 printhead (which includes a temperature control). In this category, a room temperature solid such as wax can be used by itself or to replace water as a medium to convey the primary adhesives discussed in categories 1-4. The wax itself would serve as an adhesive to cement together powder particles. Binders formulated from these materials would be appropriate for electromechanical printheads that work at elevated temperatures. At these operating temperatures, the binder would become fluid and could then be used in the three-dimensional printing process.
- Typical wax-based binder formulations would include waxes with a low melt viscosity (less than 100 centipoise) such as different grades of natural mineral, or refined waxes. Examples include but are not limited to carnauba wax beeswax, ceresine, ozokerite, montan, orlcury wax, paraffin, and microcrystalline wax. The waxes can be chemically modified to include reactive groups such as alcohols, organic acids, alcohol oxazolates, and urethane derivatives. To modify binder material properties such as melting point, melt viscosity, toughness and hardening rate, as well as to increase compatibility with added components, the waxes can be blended or compounded with resins, oils, and other polymers. Additional components include rosin, fatty acids, fatty acid salts, mono and diglycerides, mineral oils, and turpentines. Resins include polyethylene, polypropylene, polybutadiene, polyethylene oxide, polyethylene glycol, polymethyl methacrylate, poly-2-ethyl-oxazoline, polyvinylpyrrollidone, polyacrylamide, and polyvinyl alcohol.
- Adhesives in members of the first class (polymer solutions) and the second class (inorganic solutions) will often adsorb water if left exposed to ambient atmosphere. However, these adhesives will generally perform with greater reliability and efficacy if maintained in either a completely dry or wet state. By incorporating the adhesives in the liquid binder, they can thereby be maintained in a wet state and therefore exhibit the desired reliability and efficacy.
- A humectant can be included in the inventive mixture to retard evaporation of the solvent from the printed material, and to prevent drying/clogging of the printhead delivery system. Glycerol is a particularly suitable humectant when the solvent is aqueous. Other polyhydric alcohols, including but not limited to ethylene glycol, diethylene glycol, and propylene glycol, are also known in the art to retard evaporation. Additional humectants include thiodiethanol, n-methyl pyrrolidinone, and dimethyl hydantoin.
- A flowrate enhancer can be included that has some humectant properties, but serves mainly to alter the hydrodynamic properties or wetting characteristics of the fluid to maximize the volume of fluid delivered by the printhead. Flowrate enhancement is thought to be a viscoelastic phenomena increasing the flow rate of the fluid, allowing thicker layers to be printed, thus allowing the final article to be built more quickly. Specific compounds that increase the flowrate of the fluid, either by reducing friction between the fluid and the walls of the jet, or by reducing the viscosity of the fluid, include ethylene glycol diacetate and potassium aluminum sulfate. Other suitable compounds for use as the flowrate enhancer can be selected from the following non-limiting list: tetraethylene glycol dimethylether, isopropyl alcohol, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, dodecyl dimethylammoniopropane sulfonate, glycerol triacetate, ethyl acetoacetate, and water-soluble polymers including polyvinyl pyrrolidone with a molecular weight of about 30,000 units, polyethylene glycol, polyacrylic acid, and sodium polyacrylate. For the ionic polymers, such as sodium polyacrylate, the increase in flow rate varies with pH. Salts that can be used to enhance flowrate include potassium sulfate, potassium aluminum sulfate, sodium hydrogen phosphate and sodium polyphosphate.
- The fluid of the present invention can include a dye to provide a visual aid to the operator while building the article. The dye provides contrast between activated and unactivated powder which allows the operator to monitor the printed layers while building the article. The dye can be selected from the group including, but not limited to, naphthol blue-black and direct red. Other dyes that are compatible with the fluid can likewise be used.
- Cosolvents can be added to an aqueous solution to alter the viscosity of a solution by altering the solvency of the liquid for the solute. Long-chain molecules in solution conform themselves either into extended chains or into coiled structures. If the solvent has a high affinity for the solute, long molecules will spread out causing the viscosity of the solution to be high. By adding a cosolvent to the solution, the polymer can be come less strongly attracted to other dissolved polymer molecules, and begin to coil into compact balls. This tends to reduce the viscosity of a polymer solution and allows more polymer to be dissolved. Cosolvents include isopropanol, ethyl alcohol, ethylene glycol monobutyl ether, butyrolactone and acetone.
- Additives that control the pH of the binder, generally called buffers, can impart increased stability to the adhesive solutions and suspensions. Such materials include, but are not limited to, potassium hydroxide, ammonia, ammonium chloride, triethanolamine, sodium acetate, sodium gluconate, potassium sulfate, potassium hydrogen sulfate, sodium aluminum sulfate, and sodium tetraborate.
- Wetting agents are substances that control the surface tension of a liquid. These can be used to modify the spreading of the liquid adhesive on the surfaces of the printhead mechanism. These include, but are not limited to, sodium dodecyl sulfate, sodium di-octyl sulfosuccinate, ethyl butyrate, diethylene glycol monobutyl ether, polyethylene glycol alkyl ether, and sodium p-toluene sulfonate.
- Lubricants can be used to increase the rate at which liquid binder passes through the nozzles of a printhead. Depending on the materials of construction, substances such as glycerol triacetate, polyethylene oxide, polypropylene glycol, ethyl acetoacetate, diethyl succinate, and sodium polyacrylate can be used.
- Additional substances can be used to promote the stability of suspensions. Stabilizers include emulsifiers such as sorbitan trioleate, polyoxyethylene mono-dodecyl ether, polyoxyethylene sorbitan mono-oleate, and protective colloids such as polyoxyethylene-co-polyoxypropylene, polyvinyl pyrrolidone, polyacrylic acid, gelatin, and acacia gum.
- The equipment used in the method of the present invention is reliable, inexpensive, and easy to maintain, making it ideal for use in an office environment. The materials used in the present invention are capable of achieving much better performance in 3D Printing than those presently used in the liquid binder method. Thus, less equipment maintenance is required, and the reliability of the equipment is increased. Therefore, methods of the present invention can involve shorter build times and less labor than prior art methods.
- Those skilled in the art will readily appreciate that all parameters listed herein are meant to be exemplary and actual parameters depend upon the specific application for which the methods and materials of the present invention are used. It is, therefore, to be understood that the foregoing embodiments are presented by way of example only and that, within the scope of the appended claims and equivalents thereto, the invention can be practiced otherwise than as specifically described.
Claims (40)
1. A chemical composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the component comprising a nonaqueous organic monomeric compound.
2. The compositing of , wherein the compound includes at least one of an alcohol, an ester, an ether, a silane, a vinyl monomer, an acrylic monomer, or a methacrylate monomer.
claim 1
3. The composition of , comprising a solvent and a solute, and wherein the compound is the solvent.
claim 1
4. The composition of , wherein the solvent includes an alcohol.
claim 3
5. The composition of , wherein the alcohol is methyl alcohol, ethyl alcohol, isopropanol, or t-butanol.
claim 4
6. The composition of , wherein the solvent includes an ester.
claim 3
7. The composition of , wherein the ester includes at least one of ethyl acetate, dimethyl succinate, diethyl succinate, dimethyl adipate, or ethylene glycol diacetate.
claim 6
8. The composition of , wherein the compound includes a mixed vinyl-silane monomer.
claim 2
9. The composition of , wherein the mixed monomer includes vinyltriisopropoxysilane.
claim 8
10. The composition of , wherein the acrylic monomer includes at least one of tri(propylene glycol) diacrylate, ethylene glycol phenyl ether acrylate, or 1,6 hexanediol diacrylate.
claim 2
11. The composition of , wherein the methacrylic monomer includes at least one of 1,3 butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, butyl methacrylate, 1,6 hexanediol dimethacrylate, or di(propylene glycol) allyl ether methacrylate.
claim 2
12. The composition of , wherein the compound is curable in combination with a photoinitiator to form a solid, by ultraviolet radiation having a wavelength between about 320-500 nm and an energy density of about 1 joule/cm2.
claim 1
13. The composition of , wherein the compound is a solvent for a resin in the particulate material.
claim 1
14. The composition of , wherein the resin includes at least one of shellac, polyvinyl pyrrolidone, polyvinyl acetate, polyvinyl alcohol, polystyrene, styrene-butadiene copolymer, or acrylonitrile-butadiene-styrene copolymer.
claim 13
15. The composition of , wherein the particulate material includes a filler that includes an inorganic compound.
claim 1
16. The composition of , wherein the filler includes at least one of clay, aluminum oxide, silicon dioxide, aluminum silicate, potassium aluminum silicate, calcium silicate, calcium hydroxide, calcium aluminate, calcium carbonate, sodium silicate, zinc oxide, titanium dioxide, or magnetite.
claim 15
17. The composition of , further comprising a printing aid dispersed throughout the filler.
claim 15
18. The composition of , wherein the printing aid includes at least one of sorbitan trioleate, sorbitan mono-oleate, sorbitan monolaurate, polyoxyethylene sorbitan mono-oleate, polyethylene glycol, soybean oil, mineral oil, propylene glycol, fluroaklkyl polyoxyethylene polymers, glycerol triacetate, polypropylene glycol, ethylene glycol octanoate, ethylene glycol decanoate, ethoxylated derivatives of 2,4,7,9-Tetramethyl-5-decyne-4,7-diol, oleyl alcohol, or oleic acid.
claim 17
19. A binder composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the binder composition including an adhesive in combination with a fluid, the adhesive comprising a nonaqueous organic monomeric compound.
20. A chemical composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the composition comprising an anionically ionizable polymer consisting of compounds selected from the group including polymethacrylic acid, polymethacrylic acid sodium salt, and sodium polystyrene sulfonate.
21. A chemical composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the composition including an adhesive in combination with a fluid, the adhesive comprising an anionically ionizable polymer consisting of compounds selected from the group including polymethacrylic acid, polymethacrylic acid sodium salt, and sodium polystyrene sulfonate.
22. A chemical composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the composition comprising a cationic polymer.
23. The composition of , wherein the polymer includes polyethyleneimine and polydiallyldimethylammonium chloride.
claim 22
24. A binder composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the binder composition including an adhesive in combination with a fluid, the adhesive comprising a cationic polymer.
25. A chemical composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the composition comprising a nonionic polymer.
26. The composition of , wherein the polymer includes at least one of polyvinyl pyrrolidone, polyvinyl pyrrolidone copolymer with polyvinyl acetate, polyvinyl alcohol, polyvinyl methyl ether, polyacrylamide, or poly-2-ethyl-2-oxazoline.
claim 25
27. A binder composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the binder including an adhesive in combination with a fluid, the adhesive comprising a nonionic polymer.
28. A chemical composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the adhesive comprising a polymer selected from the group consisting of polymethacrylic acid, polymethacrylic acid sodium salt, sodium polystyrene sulfonate, and polyethyleneimine.
29. A binder composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the binder including an adhesive in combination with a fluid, the adhesive comprising a polymer selected from the group consisting of polymethacrylic acid, polymethacrylic acid sodium salt, sodium polystyrene sulfonate, and polyethyleneimine.
30. A chemical composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the adhesive comprising a waterborne colloid selected from the group consisting of polymethyl methacrylate, polystyrene, natural rubber, polyurethane, polyvinyl acetate, and alkyd resins.
31. A binder composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the binder including an adhesive in combination with a fluid, the adhesive comprising a polymer selected from the group consisting of polymethyl methacrylate, polystyrene, natural rubber, polyurethane, polyvinyl acetate, and alkyd resins.
32. A chemical composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the adhesive comprising an inorganic solute selected from the group consisting of sodium polyphosphate, sodium hydrogen phosphate, sodium hydrogen pyrophosphate, sodium tetraborate, ammonium hydrogen phosphate, sodium chloride, ammonium nitrate, potassium sulfate, ammonium chloride, and calcium formate.
33. A binder composition for selectively adhering particulate material to form a solid object in a three-dimensional printer, the binder including an adhesive in combination with a fluid, the adhesive comprising an inorganic solute selected from the group consisting of sodium polyphosphate, sodium tetraborate, sodium chloride, ammonium nitrate, potassium sulfate, ammonium chloride, and calcium formate.
34. A method of forming a three-dimensional object, comprising:
forming a layer of filler that includes a particulate material; and
applying a chemical composition to the layer of filler at particular locations to bind the filler at particular locations, the composition including a nonaqueous organic monomeric compound.
35. A method of forming a three-dimensional object, comprising:
forming a layer of filler that includes a particulate material; and
applying a chemical composition to the layer of filler at particular locations to bind the filler at particular locations, the composition comprising an anionically ionizable polymer consisting of compounds selected from the group including polymethacrylic acid, polymethacrylic acid sodium salt, and sodium polystyrene sulfonate.
36. A method of forming a three-dimensional object, comprising:
forming a layer of filler that includes a particulate material; and
applying a chemical composition to the layer of filler at particular locations to bind the filler at particular locations, the composition comprising a cationic polymer.
37. A method of forming a three-dimensional object, comprising:
forming a layer of filler that includes a particulate material; and
applying a chemical composition to the layer of filler at particular locations to bind the filler at particular locations, the composition comprising a nonionic polymer.
38. A method of forming a three-dimensional object, comprising:
forming a layer of filler that includes a particulate material; and
applying a chemical composition to the layer of filler at particular locations to bind the filler at particular locations, the composition comprising a polymer selected from the group consisting of polymethacrylic acid, polymethacrylic acid sodium salt, sodium polystyrene sulfonate, and polyethyleneimine.
39. A method of forming a three-dimensional object, comprising:
forming a layer of filler that includes a particulate material; and
applying a chemical composition to the layer of filler at particular locations to bind the filler at particular locations, the composition comprising a waterborne colloid selected from the group consisting of polymethyl methacrylate, polystyrene, natural rubber, polyurethane, polyvinyl acetate, and alkyd resins.
40. A method of forming a three-dimensional object, comprising:
forming a layer of filler that includes a particulate material; and
applying a chemical composition to the layer of filler at particular locations to bind the filler at particular locations, the composition comprising an inorganic solute selected from the group consisting of sodium polyphosphate, sodium tetraborate, sodium chloride, ammonium nitrate, potassium sulfate, ammonium chloride, and calcium formate.
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Owner name: Z CORPORATION, MASSACHUSETTS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BREDT, JAMES F.;CLARK, SARAH L.;UY, EVERT F.;AND OTHERS;REEL/FRAME:011914/0145;SIGNING DATES FROM 20010523 TO 20010531 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |