CN104945794A - Filling-modified PTFE (polytetrafluoroethylene) sealing plate and preparation method thereof - Google Patents
Filling-modified PTFE (polytetrafluoroethylene) sealing plate and preparation method thereof Download PDFInfo
- Publication number
- CN104945794A CN104945794A CN201510137161.XA CN201510137161A CN104945794A CN 104945794 A CN104945794 A CN 104945794A CN 201510137161 A CN201510137161 A CN 201510137161A CN 104945794 A CN104945794 A CN 104945794A
- Authority
- CN
- China
- Prior art keywords
- filling
- sealing plate
- modified ptfe
- ptfe sealing
- silicon
- 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.)
- Granted
Links
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 84
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 84
- 238000007789 sealing Methods 0.000 title claims abstract description 77
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 42
- 239000000203 mixture Substances 0.000 claims abstract description 37
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 25
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 239000010703 silicon Substances 0.000 claims abstract description 22
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 128
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 23
- 230000015572 biosynthetic process Effects 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 14
- 238000007493 shaping process Methods 0.000 claims description 14
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 12
- 229910052863 mullite Inorganic materials 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000005995 Aluminium silicate Substances 0.000 claims description 6
- 235000012211 aluminium silicate Nutrition 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229960001866 silicon dioxide Drugs 0.000 claims description 3
- 239000003209 petroleum derivative Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 4
- 238000012545 processing Methods 0.000 description 10
- 238000010304 firing Methods 0.000 description 8
- 206010016654 Fibrosis Diseases 0.000 description 4
- 230000004761 fibrosis Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 241000219357 Cactaceae Species 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 description 1
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 description 1
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000005642 Oleic acid Substances 0.000 description 1
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
Abstract
The invention relates to a filling-modified PTFE (polytetrafluoroethylene) sealing plate comprising the following raw material components: 30-70wt% of PTFE, 10-60wt% of silicon-containing substances and 2-25wt% of talcum powder. The preparation process of the filling-modified PTFE sealing plate comprises the steps of (1) mixing and stirring all raw materials, and adding a processing aid in the stirring process to form a uniform mixture; (2) extruding and forming the mixture by using an extruder to form a pre-formed body; (3) rolling the formed pre-formed body by using a roller to form a sheet; (4) drying and removing the processing aid; and (5) sintering to obtain the filling-modified PTFE sealing plate. The filling-modified PTFE sealing plate prepared by the invention has the characteristics of low PTFE dosage and also has low creep relaxation and high sealing performance.
Description
Technical field
The present invention relates to a kind of filling-modified PTFE sealing plate material and preparation method thereof, be specifically related to a kind of to there is filling-modified PTFE sealing plate material of low creep and high sealing performance and preparation method thereof.
Background technology
Tetrafluoroethylene is a kind of perfluorinated polymers obtained through radical polymerization by monomer tetrafluoroethylene, because its special mechanical feature makes it have chemical stability, extremely strong high and low temperature resistance, the outstanding not viscosity of height, good oilness, useful electrical insulating property, ageing resistance, minimum water-absorbent etc., and use temperature scope is wide, is widely used as various sealing member.But single polytetrafluoroethylmaterial material mechanical property is poor, coefficient of linear expansion is large, and creep resistant is poor, wears no resistance, hardness is low, shaping and secondary processing difficult.
Carry out modification to tetrafluoroethylene, current methods mainly contains: surface modification, filling-modified and blending and modifying etc. improve its over-all properties, wherein filling-modified comparatively simple, price is low, effective.If patent application 103509300A is by mixing, for improving wear resistance and the mechanical property of material by the polytetrafluoro of 80-95 part and with the tensio-active agent of the ultrafine kaolin of 5-20 part, the filler of 0.01-1 and 0.005-0.1 part; Mix with the barium sulfate of the tetrafluoroethylene of 50-90% and surplus in patent application CN1687223A, for improving the creep relaxation of polytetrafluoroethylene PTFE and unfrequented defect problem; Carry out mixing rear mold pressing, sintering and cooling with the nanometer F3O4 of the oleic acid surface modification of 5-15% with the tetrafluoroethylene powder of 85-95% in patent application CN102627821A.As weighting agent, conventional at present also have various inorganic fibre class, as glass fibre, carbon fiber, graphite and various ceramics powders etc.
But the defect of existing filling-modified PTFE stuffing materials be also polytetrafluoroethylene content higher, for filling-modified PTFE sealing plate material pad, there is creep resistance to relax and to treat coldly the ability of phenomenon poor, the latter's sealing property is not ideal enough, and the gasket seal simultaneously possessing low creep relaxation and high sealing performance is little.
Summary of the invention
The object of the invention is to the defect overcoming prior art, there is provided a kind of and there is filling-modified PTFE sealing plate material of low creep and high sealing performance and preparation method thereof, the sealing plate material of preparation has the advantage having low creep relaxation and high sealing performance concurrently, and greatly can extend the work-ing life of material.
The present invention is achieved by the following technical solutions:
A kind of filling-modified PTFE sealing plate material, be made up of the raw material comprising following weight percent:
Tetrafluoroethylene 30-70wt%;
Silicon-containing material 10-60wt%;
Talcum powder 2-25wt%;
Preferably, described tetrafluoroethylene is 30-60wt%, and silicon-containing material is 15-60wt%.
More preferably, described tetrafluoroethylene is 35-55wt%, and silicon-containing material is 27-53wt%.
Preferably, the standard relative density of described tetrafluoroethylene is 2.15 ~ 2.23, is more preferably 2.15 ~ 2.20, and the density of described silicon-containing material is not higher than 3.1g/cm
3.
Adopt formula of the present invention, when described polytetrafluoroethylene content is lower, if tetrafluoroethylene is 30-45wt%, silicon-containing material is 30-53wt%, even further described tetrafluoroethylene is 30-39wt%, when silicon-containing material is 36-53wt%, still can obtain excellent creep-resistant property and sealing property to meet service requirements, the usage quantity of tetrafluoroethylene can also be reduced simultaneously, reduce costs.
Preferably, described tetrafluoroethylene is Powdered dispersed polytetrafluoroethylresin, and median size is 350-750 μm.Such as, the PTFE fine powder CD-1 of Asahi Glass Co., Ltd can be selected.
In the present invention, talcously add the stopping property that can further improve sealing plate material.Preferably, described talcous content is 3-18wt%.Preferably, described talcous shape is flats or flaky powder, and median size is 1 μm-19 μm; Preferred median size is 3 μm-15 μm.
Preferably, described silicon-containing material is the mixing of one or more in mullite, silicon-dioxide or kaolin.
Preferably, the median size of described silicon-containing material is 5 μm-30 μm.
The present invention further provides the preparation method of described a kind of filling-modified PTFE sealing plate material, specifically comprise the following steps:
(1) each raw material is taken by proportioning;
(2) stirring is mixed: tetrafluoroethylene, silicon-containing material and talcum powder in batching being carried out mix and blend, adding processing aid, to forming uniform mixture in whipping process;
(3) preliminary shaping: utilize forcing machine by said mixture extrusion molding, forms preform;
(4) rolling: make the preform of above-mentioned formation be rolled into sheet material by roll;
(5) dry: the sheet drying that the rolling is formed, remove processing aid;
(6) sinter: carry out dried sheet material to sinter i.e. obtained described filling-modified PTFE sealing plate material.
Wherein,
Preferably, in step (2), the consumption of described processing aid is the 10-25wt% of tetrafluoroethylene, silicon-containing material and talcum powder gross weight, and being preferably 14-25wt%, is further 14-23wt%.
Preferably, described processing aid is selected from the petroleum hydrocarbon solvent of cut point below 125 DEG C, the ISOPAR C of such as Exxon Mobil, the CACTUS SOLVENT R5N etc. of Japan Energy Corp. company, be conducive to the volatilization of solvent in the subsequent handling such as drying, sintering.
Preferably, in step (3), described extrusion molding temperature is 19-40 DEG C; More preferably under room temperature (25 DEG C), extrusion moulding is carried out; Namely below the roller temperature of basic controlling in rolling process, make processing aid non-volatile, simultaneously shaping for making PTFE fine powder be convenient to, extrusion molding temperature should remain on more than 19 DEG C.
Preferably, in step (4), during described roll rolling, roll shop building is apart from being set as 0.5 ~ 20mm, and roller surface translational speed is 5 ~ 50mm/ second, and roller temperature is 40 ~ 80 DEG C.
Preferably, in step (5), dry temperature can be placed and be carried out under normal temperature, or the heating temperatures below the boiling point of teflon resin, removes processing aid by this.
Preferably, in step (6), the temperature of described sintering is 345 ~ 375 DEG C, and be preferably 350 ~ 375 DEG C, the time of sintering is 0.5h-4.0h, is preferably 1.5-3.0h.
Preferably, the thickness of the filling-modified PTFE sealing plate material of preparation is 0.8-4.0mm.
What the present invention made full use of that PTFE material has can fibrosis and agglomerability feature, packing material mullite, talcum powder and PTFE base material is held tightly together, forms the PTFE sealing plate material pad with low creep, high sealing performance.And talcum powder has the feature of satiny property, also helps the processibility greatly improving sheet material.Wherein PTFE base material plays primary seal effect, mullite and talcum powder play the effect improving PTFE creep relaxation, utilize talcous laminate structure simultaneously and there is the trend that easily splits into scale and special slip and assist and improve sealing property, prepare material and mainly have the following advantages:
(1) low creep relaxation feature: use a large amount of containing silicon ore and talc in PTFE material, reduce PTFE at the whole content coordinated in composition, significantly reduce creep relaxation or unfrequented phenomenon, there is low creep relaxation feature; For the trial target of 1.5mm thickness, under 200 DEG C of hot conditionss, the purer PTFE pad of its stress relaxation ability improves more than 40%, substantially prolongs the work-ing life of gasket seal.
(2) excellent sealing property: connected by very weak Van der Waals force between the table plane of talcum powder laminate structure, in the course of processing, apply certain shearing force just can by its layering, extend the formation scale structure that comes, make it have low gas percent of pass, thus greatly improve the sealing property of pad.
(3) excellent chemical resistance: be applicable to the fluids such as acid, alkali, oil, salts solution, organic solvent, there is good chemical-resistant.
(4) low cost: cheap inorganic materials (mullite, silicon-dioxide, kaolin etc.), talcum powder content in composition and ratio are high.
(5) intensity is good: tensile break strength and to damage intensity by pressure good, can meet usual working condition.
Accompanying drawing explanation
One filling-modified PTFE sealing plate material diagrammatic cross-section prepared by Fig. 1 embodiment 2
Reference numeral:
1, talcum powder;
2, fibrosis PTFE resin;
3, mullite.
Embodiment
Below by way of specific specific examples, technical scheme of the present invention is described.Should be understood that one or more method stepss that the present invention mentions do not repel and before and after described combination step, also to there is additive method step or can also insert additive method step between these steps clearly mentioned; Should also be understood that these embodiments are only not used in for illustration of the present invention to limit the scope of the invention.And, except as otherwise noted, the numbering of various method steps is only the convenient tool differentiating various method steps, but not be ordering or the enforceable scope of restriction the present invention of restriction various method steps, the change of its relativeness or adjustment, when changing technology contents without essence, when being also considered as the enforceable category of the present invention.
Embodiment 1: prepare a kind of filling-modified PTFE sealing plate material
(1) stir mixed: the SiO by the Powdered dispersed polytetrafluoroethylresin (Asahi Glass Co., Ltd PTFE fine powder CD-1) of 47wt%, the median size of 50wt% being 9 ~ 13 μm
2mix and blend is carried out with the talcum powder (three total amount 100wt%) that 3wt% median size is 5 ~ 9 μm of flats, add the processing aid (the ISOPAR C of Exxon Mobil) of afore-mentioned materials total amount 23wt% in whipping process, be stirred to formation uniform mixture;
(2) preliminary shaping: under room temperature (25 DEG C), extrude with the forcing machine of mouth mould 300mm × 20mm, make preform;
(3) rolling: roller diameter 700mm, roll shop building under the condition of 20mm, roller surface translational speed 10mm/ second, roller temperature 80 DEG C with the preform of the above-mentioned formation of twin shaft roll rolling; Finally roll shop building distance is adjusted to 1.5mm, rolling obtains the sheet material that thickness is 1.5mm;
(4) dry: the sheet material that the rolling is formed to be placed under room temperature (25 DEG C) 24 hours except desolventizing;
(5) sinter: dried sheet material is burnt till 3 hours with 350 DEG C in firing furnace, obtains the sealing plate material of thickness 1.5mm.
According to above-mentioned processing step, adjustment rolled sheet thickness, obtained thickness is the filling-modified PTFE sealing plate material of 3.0mm.
3wt% talcum powder in example is adopted SiO simultaneously
2substitute and do ratio.
Embodiment 2: prepare a kind of filling-modified PTFE sealing plate material
(1) stir mixed: the talcum powder (three total amount 100wt%) of 11-15 μm of sheet that to be the mullite of 16-20 μm and 18wt% median size by the Powdered dispersed polytetrafluoroethylresin (Asahi Glass Co., Ltd PTFE fine powder CD-1) of 55wt%, the median size of 27wt% be carries out mix and blend, add the ISOPAR C processing aid of the Exxon Mobil of afore-mentioned materials total amount 14wt% in whipping process, be stirred to formation uniform mixture;
(2) preliminary shaping: under room temperature (25 DEG C), extrude with the forcing machine of mouth mould 300mm × 20mm, make preform;
(3) rolling: roller diameter 700mm, roll shop building under the condition of 20mm, roller surface translational speed 50mm/ second, roller temperature 60 DEG C with the preform of the above-mentioned formation of twin shaft roll rolling; Finally roll shop building distance is adjusted to 1.5mm, rolling obtains the sheet material that thickness is 1.5mm;
(4) dry: the sheet material that the rolling is formed to be placed under room temperature (25 DEG C) 24 hours except desolventizing;
(5) sinter: dried sheet material is burnt till 2 hours with 375 DEG C in firing furnace, obtains the sealing plate material of thickness 1.5mm.
According to above-mentioned processing step, adjustment rolled sheet thickness, obtained thickness is the filling-modified PTFE sealing plate material of 3.0mm.The diagrammatic cross-section of obtained sheet material as shown in Figure 1.Powdery dispersed polytetrafluoroethylresin, stirring in preparation process, extrude in preliminary shaping and the operation of rolling and fibrosis can occur, in sintering process, tetrafluoroethylene is melt shape, other filler is bonded together, finally forms this filling-modified PTFE sealing plate material as shown in Figure 1.
Adopt equivalent mullite to substitute talcum powder in example to do ratio simultaneously.
Embodiment 3: prepare a kind of filling-modified PTFE sealing plate material
(1) stir mixed: the talcum powder (three total amount 100wt%) of 3 ~ 7 μm of sheets that to be the kaolin of 18 ~ 22 μm and 2wt% median size by the Powdered dispersed polytetrafluoroethylresin (Asahi Glass PTFE fine powder CD-1) of 47wt%, the median size of 51wt% be carries out mix and blend, add the ISOPAR C processing aid of the Exxon Mobil of afore-mentioned materials total amount 16wt% in whipping process, be stirred to formation uniform mixture;
(2) preliminary shaping: under room temperature (25 DEG C), extrude with the forcing machine of mouth mould 300mm × 20mm, make preform;
(3) rolling: roller diameter 700mm, roll shop building under the condition of 20mm, roller surface translational speed 30mm/ second, roller temperature 40 DEG C with the preform of the above-mentioned formation of twin shaft roll rolling; Finally roll shop building distance is adjusted to 1.5mm, rolling obtains the sheet material that thickness is 1.5mm;
(4) dry: the sheet material that the rolling is formed to be placed under room temperature (25 DEG C) 24 hours except desolventizing;
(5) sinter: dried sheet material is burnt till 3 hours with 365 DEG C in firing furnace, obtains the sealing plate material of thickness 1.5mm.
According to above-mentioned processing step, adjustment rolled sheet thickness, obtained thickness is the filling-modified PTFE sealing plate material of 3.0mm.
Adopt equivalent kaolin to substitute talcum powder in example to do ratio simultaneously.
Embodiment 4: prepare a kind of filling-modified PTFE sealing plate material
(1) stir mixed: the talcum powder (three total amount 100wt%) of 3 ~ 7 μm of sheets that to be the mullite of 24 ~ 30 μm and 25wt% median size by the Powdered dispersed polytetrafluoroethylresin (Asahi Glass PTFE fine powder CD-1) of 30wt%, the median size of 45wt% be carries out mix and blend, add the CACTUS SOLVENT R5N processing aid of the Japan Energy Corp. company of afore-mentioned materials total amount 25wt% in whipping process, be stirred to formation uniform mixture;
(2) preliminary shaping: under room temperature (25 DEG C), extrude with the forcing machine of mouth mould 300mm × 20mm, make preform;
(3) rolling: roller diameter 700mm, roll shop building under the condition of 20mm, roller surface translational speed 5mm/ second, roller temperature 80 DEG C with the preform of the above-mentioned formation of twin shaft roll rolling; Finally roll shop building distance is adjusted to 1.5mm, rolling obtains the sheet material that thickness is 1.5mm;
(4) dry: the sheet material formed by the rolling removes desolventizing with 100 DEG C of heating temperatures in sintering oven;
(5) sinter: dried sheet material is burnt till 3 hours with 370 DEG C in firing furnace, obtains the sealing plate material of thickness 1.5mm.
According to above-mentioned processing step, adjustment rolled sheet thickness, obtained thickness is the filling-modified PTFE sealing plate material of 3.0mm.
Embodiment 5: prepare a kind of filling-modified PTFE sealing plate material
(1) stir mixed: the talcum powder (three total amount 100wt%) of 5 ~ 9 μm of sheets that to be SiO2 and the 2wt% median size of 5 ~ 9 μm by the Powdered dispersed polytetrafluoroethylresin (Asahi Glass PTFE fine powder CD-1) of 70wt%, the median size of 28wt% be carries out mix and blend, add the CACTUS SOLVENT R5N processing aid of the Japan Energy Corp. company of afore-mentioned materials total amount 15wt% in whipping process, be stirred to formation uniform mixture;
(2) preliminary shaping: under room temperature (25 DEG C), extrude with the forcing machine of mouth mould 300mm × 20mm, make preform;
(3) rolling: roller diameter 700mm, roll shop building under the condition of 20mm, roller surface translational speed 20mm/ second, roller temperature 50 DEG C with the preform of the above-mentioned formation of twin shaft roll rolling; Finally roll shop building distance is adjusted to 1.5mm, rolling obtains the sheet material that thickness is 1.5mm;
(4) dry: the sheet material formed by the rolling removes desolventizing with 100 DEG C of heating temperatures in sintering oven;
(5) sinter: dried sheet material is burnt till 1.5 hours with 360 DEG C in firing furnace, obtains the sealing plate material of thickness 1.5mm.
According to above-mentioned processing step, adjustment rolled sheet thickness, obtained thickness is the filling-modified PTFE sealing plate material of 3.0mm.
Embodiment 6: prepare a kind of filling-modified PTFE sealing plate material
(1) stirring is mixed: the SiO that the mullite being 9 ~ 13 μm by the Powdered dispersed polytetrafluoroethylresin (Asahi Glass PTFE fine powder CD-1) of 55wt%, the median size of 24wt%, 9wt% median size are 5 ~ 9 μm
2mix and blend is carried out with the talcum powder (four total amount 100wt%) that 12wt% median size is 5 ~ 9 μm of flats, add the ISOPAR C processing aid of the Exxon Mobil of afore-mentioned materials total amount 20wt% in whipping process, be stirred to formation uniform mixture;
(2) preliminary shaping: under room temperature (25 DEG C), extrude with the forcing machine of mouth mould 300mm × 20mm, make preform;
(3) rolling: roller diameter 700mm, roll shop building under the condition of 20mm, roller surface translational speed 20mm/ second, roller temperature 50 DEG C with the preform of the above-mentioned formation of twin shaft roll rolling; Finally roll shop building distance is adjusted to 1.5mm, rolling obtains the sheet material that thickness is 1.5mm;
(4) dry: the sheet material formed by the rolling removes desolventizing with 100 DEG C of heating temperatures in sintering oven;
(5) sinter: dried sheet material is burnt till 2 hours with 360 DEG C in firing furnace, obtains the sealing plate material of thickness 1.5mm.
According to above-mentioned processing step, adjustment rolled sheet thickness, obtained thickness is the filling-modified PTFE sealing plate material of 3.0mm.
Adopt equivalent mullite to substitute talcum powder in example to do ratio simultaneously.
Embodiment 7: prepare a kind of filling-modified PTFE sealing plate material
(6) stir mixed: the talcum powder (three total amount 100wt%) of 11-15 μm of sheet that to be the mullite of 16-20 μm and 2wt% median size by the Powdered dispersed polytetrafluoroethylresin (Asahi Glass Co., Ltd PTFE fine powder CD-1) of 45wt%, the median size of 53wt% be carries out mix and blend, add the ISOPAR C processing aid of the Exxon Mobil of afore-mentioned materials total amount 14wt% in whipping process, be stirred to formation uniform mixture;
(7) preliminary shaping: under room temperature (25 DEG C), extrude with the forcing machine of mouth mould 300mm × 20mm, make preform;
(8) rolling: roller diameter 700mm, roll shop building under the condition of 20mm, roller surface translational speed 50mm/ second, roller temperature 60 DEG C with the preform of the above-mentioned formation of twin shaft roll rolling; Finally roll shop building distance is adjusted to 1.5mm, rolling obtains the sheet material that thickness is 1.5mm;
(9) dry: the sheet material that the rolling is formed to be placed under room temperature (25 DEG C) 24 hours except desolventizing;
(10) sinter: dried sheet material is burnt till 2 hours with 375 DEG C in firing furnace, obtains the sealing plate material of thickness 1.5mm.
According to above-mentioned processing step, adjustment rolled sheet thickness, obtained thickness is the filling-modified PTFE sealing plate material of 3.0mm.The diagrammatic cross-section of obtained sheet material as shown in Figure 1.Powdery dispersed polytetrafluoroethylresin, stirring in preparation process, extrude in preliminary shaping and the operation of rolling and fibrosis can occur, in sintering process, tetrafluoroethylene is melt shape, other filler is bonded together, finally forms this filling-modified PTFE sealing plate material as shown in Figure 1.
Embodiment 8: prepare a kind of filling-modified PTFE sealing plate material
(6) stir mixed: the SiO by the Powdered dispersed polytetrafluoroethylresin (Asahi Glass Co., Ltd PTFE fine powder CD-1) of 45wt%, the median size of 30wt% being 9 ~ 13 μm
2mix and blend is carried out with the talcum powder (three total amount 100wt%) that 25wt% median size is 5 ~ 9 μm of flats, add the processing aid (the ISOPAR C of Exxon Mobil) of afore-mentioned materials total amount 23wt% in whipping process, be stirred to formation uniform mixture;
(7) preliminary shaping: under room temperature (25 DEG C), extrude with the forcing machine of mouth mould 300mm × 20mm, make preform;
(8) rolling: roller diameter 700mm, roll shop building under the condition of 20mm, roller surface translational speed 10mm/ second, roller temperature 80 DEG C with the preform of the above-mentioned formation of twin shaft roll rolling; Finally roll shop building distance is adjusted to 1.5mm, rolling obtains the sheet material that thickness is 1.5mm;
(9) dry: the sheet material that the rolling is formed to be placed under room temperature (25 DEG C) 24 hours except desolventizing;
(10) sinter: dried sheet material is burnt till 3 hours with 350 DEG C in firing furnace, obtains the sealing plate material of thickness 1.5mm.
According to above-mentioned processing step, adjustment rolled sheet thickness, obtained thickness is the filling-modified PTFE sealing plate material of 3.0mm.
The performance test results that embodiment 1-8 obtains filling-modified PTFE sealing plate material is as shown in table 1
Table 1 embodiment 1-8 obtains filling-modified PTFE sealing plate material batching and the performance test results
Note: in table, the testing experiment of stopping property uses shim size to be 50mm × 65mm, and test fluid flow is N
2, interior pressure is 1MPa, and fastening surface pressure is 19.6MPa.
As can be seen from Table 1, by the present invention, obtained sealing plate material has the low feature of tetrafluoroethylene consumption, and has low creep relaxation and high sealing performance simultaneously.
Claims (15)
1. a filling-modified PTFE sealing plate material, be made up of the raw material comprising following weight percent:
Tetrafluoroethylene 30-70wt%;
Silicon-containing material 10-60wt%;
Talcum powder 2-25wt%.
2. a kind of filling-modified PTFE sealing plate material as claimed in claim 1, it is characterized in that, described polytetrafluoroethylene content is 30-60wt%, and silicon-containing material is 15-60wt%.
3. a kind of filling-modified PTFE sealing plate material as claimed in claim 1, is characterized in that, the standard relative density of described tetrafluoroethylene is 2.15 ~ 2.23, and the density of described silicon-containing material is not higher than 3.1g/cm
3.
4. a kind of filling-modified PTFE sealing plate material as claimed in claim 1, it is characterized in that, described polytetrafluoroethylene content is 35-55wt%, and silicon-containing material is 27-53wt%; Or described polytetrafluoroethylene content is 30-45wt%, silicon-containing material is 30-53wt%; Or described polytetrafluoroethylene content is 30-39wt%, silicon-containing material is 36-53wt%.
5. a kind of filling-modified PTFE sealing plate material as claimed in claim 1, it is characterized in that, described tetrafluoroethylene is Powdered dispersed polytetrafluoroethylresin, and median size is 350-750 μm.
6. a kind of filling-modified PTFE sealing plate material as claimed in claim 1, it is characterized in that, described talcous shape is flats or flaky powder, and median size is 1 μm-19 μm.
7. a kind of filling-modified PTFE sealing plate material as claimed in claim 1, is characterized in that, described silicon-containing material is the mixing of one or more in mullite, silicon-dioxide or kaolin.
8. a kind of filling-modified PTFE sealing plate material as claimed in claim 1, is characterized in that, the median size of described silicon-containing material is 5 μm-30 μm.
9. a kind of filling-modified PTFE sealing plate material as claimed in claim 1, is characterized in that, the thickness of described filling-modified PTFE sealing plate material is 0.8-4.0mm.
10. the preparation method of a kind of filling-modified PTFE sealing plate material as described in as arbitrary in claim 1-9, specifically comprises the following steps:
(1) each raw material is taken by proportioning;
(2) stirring is mixed: tetrafluoroethylene, silicon-containing material and talcum powder in batching being carried out mix and blend, adding processing aid, to forming uniform mixture in whipping process;
(3) preliminary shaping: utilize forcing machine by said mixture extrusion molding, forms preform;
(4) rolling: make the preform of above-mentioned formation be rolled into sheet material by roll;
(5) dry: the sheet drying that the rolling is formed, remove processing aid;
(6) sinter: carry out dried sheet material to sinter i.e. obtained described filling-modified PTFE sealing plate material.
The preparation method of 11. a kind of filling-modified PTFE sealing plate materials as shown in claim 10, it is characterized in that, in step (2), the consumption of described processing aid is the 10-25wt% of tetrafluoroethylene, silicon-containing material and talcum powder gross weight.
The preparation method of 12. a kind of filling-modified PTFE sealing plate materials as shown in claim 10, it is characterized in that, described processing aid is selected from the petroleum hydrocarbon solvent of cut point below 125 DEG C.
The preparation method of 13. a kind of filling-modified PTFE sealing plate materials as shown in claim 10, it is characterized in that, in step (3), described extrusion molding temperature is 19-40 DEG C.
The preparation method of 14. a kind of filling-modified PTFE sealing plate materials as shown in claim 10, is characterized in that, in step (4), during described roll rolling, roll shop building is apart from being set as 0.5 ~ 20mm, and roller surface translational speed is 5 ~ 50mm/ second, and roller temperature is 40 ~ 80 DEG C.
The preparation method of 15. a kind of filling-modified PTFE sealing plate materials as shown in claim 10, it is characterized in that, in step (6), the temperature of described sintering is 345 ~ 375 DEG C, and the time of sintering is 0.5h-4.0h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510137161.XA CN104945794B (en) | 2014-03-31 | 2015-03-26 | A kind of filling-modified PTFE seal sheet material and preparation method thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410125990 | 2014-03-31 | ||
| CN2014101259901 | 2014-03-31 | ||
| CN201510137161.XA CN104945794B (en) | 2014-03-31 | 2015-03-26 | A kind of filling-modified PTFE seal sheet material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104945794A true CN104945794A (en) | 2015-09-30 |
| CN104945794B CN104945794B (en) | 2018-02-06 |
Family
ID=54160893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510137161.XA Active CN104945794B (en) | 2014-03-31 | 2015-03-26 | A kind of filling-modified PTFE seal sheet material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104945794B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106398059A (en) * | 2016-06-20 | 2017-02-15 | 安徽荣达阀门有限公司 | Carbon nanotube-polytetrafluoroethylene valve sealing ring filled with modified mullite powder |
| CN112172211A (en) * | 2020-09-29 | 2021-01-05 | 江苏中际信通讯材料有限公司 | Processing method for reducing thickness of PTFE (polytetrafluoroethylene) membrane containing filler |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4580790A (en) * | 1984-06-21 | 1986-04-08 | Hughes Aircraft Company | Sintered polytetrafluoroethylene composite material and seal assembly |
| CN1071179A (en) * | 1991-09-29 | 1993-04-21 | 中国人民解放军工程兵工程学院 | Carbon-fibre reinforced polytetrafluorethylesealing sealing material and preparation method thereof |
| CN102731942A (en) * | 2012-06-13 | 2012-10-17 | 浙江大学 | Preparation method of talc filled PTFE composite material |
-
2015
- 2015-03-26 CN CN201510137161.XA patent/CN104945794B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4580790A (en) * | 1984-06-21 | 1986-04-08 | Hughes Aircraft Company | Sintered polytetrafluoroethylene composite material and seal assembly |
| CN1071179A (en) * | 1991-09-29 | 1993-04-21 | 中国人民解放军工程兵工程学院 | Carbon-fibre reinforced polytetrafluorethylesealing sealing material and preparation method thereof |
| CN102731942A (en) * | 2012-06-13 | 2012-10-17 | 浙江大学 | Preparation method of talc filled PTFE composite material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106398059A (en) * | 2016-06-20 | 2017-02-15 | 安徽荣达阀门有限公司 | Carbon nanotube-polytetrafluoroethylene valve sealing ring filled with modified mullite powder |
| CN112172211A (en) * | 2020-09-29 | 2021-01-05 | 江苏中际信通讯材料有限公司 | Processing method for reducing thickness of PTFE (polytetrafluoroethylene) membrane containing filler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104945794B (en) | 2018-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102348754B (en) | Filled fluororesin sheet, process for producing same, and gasket | |
| CN108659575A (en) | A kind of superfine heavy calcium carbonate filler and preparation method thereof | |
| CN103013001A (en) | Aging-resistant rubber | |
| CN103772973B (en) | A kind of high abrasion silicon nitride/nylon 6 nano-composite and preparation method thereof | |
| CN102181111B (en) | Process for producing a fluororesin sheet containing a filler and a fluororesin sheet containing a filler | |
| CN104945794A (en) | Filling-modified PTFE (polytetrafluoroethylene) sealing plate and preparation method thereof | |
| JP2022544465A (en) | PVC formulations with high inorganic filler content and hydroxyl-functional organopolysiloxanes | |
| KR102294859B1 (en) | Silicone rubber composite and manufacturing method thereof | |
| CN107880523B (en) | Polyether ketone/fusible fluoroplastic alloy and preparation method thereof | |
| JP4909969B2 (en) | Fluororesin sheet for gasket, manufacturing method thereof, and sheet gasket | |
| EP3418260B1 (en) | Flake glass and resin composition | |
| JP5391188B2 (en) | Fluororesin sheet for gasket, method for producing fluororesin sheet for gasket, and sheet gasket | |
| JPH04202329A (en) | Production of tetrafluoroethylene copolymer powder | |
| CN104086925A (en) | Preparation method of ultralow-temperature sealing element for spaceflight | |
| CN108659545A (en) | A kind of silicon rubber composite material and preparation method thereof | |
| EP2986667A1 (en) | Fluororesin and mesoporous silica composition and molded product thereof | |
| CN103509253A (en) | Submerged pump cable rubber sheath rubber composition | |
| CN109679257A (en) | A kind of FEP color resin formula | |
| CN111040348B (en) | Preparation method of fluororesin composite membrane material with high filling amount and large width | |
| CN115349004A (en) | Sealing material | |
| CN111454561A (en) | High-performance white carbon black dispersing agent and preparation method thereof | |
| CN107603083B (en) | High-thermal-conductivity fluororubber premix and preparation method thereof | |
| CN114644778B (en) | Low-crushing-rate high-hardness talcum powder master batch and preparation method and application thereof | |
| KR100926952B1 (en) | Oil-containing powder for polymer compound | |
| CN110255977B (en) | Hard asphalt mixture and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Tokyo, Japan Patentee after: Company Walka Address before: Tokyo, Japan Patentee before: Nippon Valqua Industries, Ltd. |