WO1996011980A1 - Process for producing cellulose fibre particles and cellulose fibre particles - Google Patents

Process for producing cellulose fibre particles and cellulose fibre particles Download PDF

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Publication number
WO1996011980A1
WO1996011980A1 PCT/DK1995/000401 DK9500401W WO9611980A1 WO 1996011980 A1 WO1996011980 A1 WO 1996011980A1 DK 9500401 W DK9500401 W DK 9500401W WO 9611980 A1 WO9611980 A1 WO 9611980A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
oil
particles
cellulose fibre
silica
Prior art date
Application number
PCT/DK1995/000401
Other languages
French (fr)
Inventor
Jarn Pedersen
Original Assignee
I/S Kara
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by I/S Kara filed Critical I/S Kara
Publication of WO1996011980A1 publication Critical patent/WO1996011980A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/12—Powdering or granulating
    • 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
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/02—Cellulose; Modified cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
    • C08J2301/02—Cellulose; Modified cellulose

Definitions

  • the present invention relates to a process for producing cellulose fibre particles for use as an additive wherein a composite mass comprising cellulose fibres and oil is prepared and thereafter the composite mass is, under compression, transformed into particles.
  • WO 88/08438 discloses a granulate of fibres for use as a filler material in bitumen wherein the fibres in the granulate are bonded together by bitumen.
  • the oil forms a coherent, workable mass which is held together solely by cohesion. Furthermore, the oil functions as a lubricant/parting agent in the pelleting of the composite mass. Oil has no binding effect in the additive and is compatible with the material into which the additive is to be admixed and accordingly the oil does neither prevent nor obstruct the dispersion of the additive in the material .
  • the pellets prepared by the above-mentioned prior art process usually have an oil content of about 25% by weight. By reducing the oil content to below 25% by weight the amount of energy consumed during the pelleting will increase because, as mentioned above, the oil functions as a lubricant. An oil content of at least 12% is required in the finished pellets in order to permit pelleting.
  • the object of the present invention is to provide a process of the type stated in the introductory part of claim 1 by which cellulose fibre particles with a reduced oil content can be prepared.
  • silica functions as a parting and releasing agent.
  • the process according to the invention preferably uses a composite mass comprising, on an anhydrous basis, 2.0-5.0% by weight of silica and 5.0- 15.0% by weight of oil, preferably 2.5-3.5% by weight of silica and 10.0- 14.0% by weight of oil .
  • sica means silicium dioxide.
  • the cellulose fibres used in the process of the invention may be any type, e.g. cellulose fibres prepared by processing waste paper material such as newspapers.
  • a preferred embodiment of the invention is characterized in that the composite mass further comprises water.
  • Water serves as an additional lubricating and releasing agent in the apparatus in which the compression of the composite mass is performed.
  • a further special embodiment of the invention is characterized in that a pair of rollers is used for transforming the composite mass into particles.
  • the particles prepared by the process of the invention may e.g. be in the form of pellets with a cylindrical shape, granules or flakes.
  • the cellulose fibre particles according to the invention are charac- terized in that they comprise cellulose fibres in an amount of 80.0-93.0% by weight, oil in an amount of 5.0-15.0% by weight, and silica in an amount of 2.0-5.0% by weight.
  • a preferred embodiment of the invention is characterized in that the cellulose fibre particles comprise mineral fibres in an amount of 82.5- 87.5% by weight, oil in an amount of 10.0-14.0% by weight, and silica in an amount of 2.5-3.5% by weight.
  • Cellulose fibre particles of the invention were prepared using the process of the invention.
  • the cellulose fibre starting material is a mixture of various newspapers.
  • the newspaper material is decomposed in an Acta crusher and finely divided in a shredder to which silica of the type Elkern Microsilica ⁇ from Elkern Materials is added by means of a vibrating metering device.
  • the mixture of finely divided newspaper material and silica is thereafter milled in a FCC 10 hammer mill provided with a sieve having openings with a diameter of 2 mm to effect an efficient mixing of newspaper material and silica.
  • the resulting fibre mixture is by means of a conveyor belt led from the hammer mill via a belt weigher to a cascade mixer.
  • Oil of the type Mobilsol 41 is heated to 90 * C in a heat exchanger and together with steam injected into the fibre mixture.
  • the dosing of the oil is controlled electronically on the basis of the amount of fibre mixture supplied to the cascade mixer, the amount being measured on the belt weigher.
  • the mixture obtained in the cascade mixer is thereafter pelleted in a Swiss Co bi pelleting press provided with a matrix having openings with a diameter of 3 mm and a length of 4 mm.
  • Various operational parameters for two experiments will appear from Table 1.
  • the extrusion proceeded with no tendency of clotting of the openings and with no tendency of overheating of the matrix.
  • the resulting fibre pellets had a cylindrical shape with a diameter of about 3 mm and a length of 3-6 mm.
  • the pellets had a good coherence and a good ability to be mixed with bitumen.
  • the energy consumption in the pelleting press during the extrusion was 40-45 Amperes.
  • the resulting pellets had a good coherence and they remained sub ⁇ stantially intact during handling, packaging, transportation and processing in feeding apparatus in connection with the addition to a bitumen product.
  • the resulting bituminous mixture had a fibre content of 0.25% by weight.
  • the pellets used were highly flowable and the feeding proceeded without problems like clotting in the feeding box.
  • the resulting bituminous product containing fibres was laid out on a section of a motorway.

Abstract

A process for producing cellulose fibre particles for use as an additive wherein a composite mass is prepared comprising cellulose fibres, oil and silica and wherein the composite mass is thereafter, under compression, transformed into particles.

Description

PROCESS FOR PRODUCING CELLULOSE FIBRE PARTICLES AND CELLULOSE FIBRE PARTICLES
The present invention relates to a process for producing cellulose fibre particles for use as an additive wherein a composite mass comprising cellulose fibres and oil is prepared and thereafter the composite mass is, under compression, transformed into particles.
Cellulose fibres are used as an additive for a variety of materials, such as asphalt and other bitumen-based products, joint fillers and sealing materials, paint and lacquer products, plaster products, adhesives, and plastics and gum products, wherein they function as a thickening and reinforcing agent and serve to improve the rheological properties of the material.
Generally, cellulose fibre additives are prepared in the form of particles, such as pellets, in order to make the handling and trans¬ portation of the fibres easier and to reduce the release of fibres into the environment during handling and transportation. By adding the particles to a receiving material the particles are broken up so that the fibres can be uniformly dispersed throughout the material.
WO 88/08438 discloses a granulate of fibres for use as a filler material in bitumen wherein the fibres in the granulate are bonded together by bitumen.
In a well-known process of the type stated in the introductory part of claim 1 finely divided paper fibre material and oil are mixed to form a pulp which is thereafter transferred to a pelleting press in which the pulp is transformed into pellets.
Together with the cellulose fibres the oil forms a coherent, workable mass which is held together solely by cohesion. Furthermore, the oil functions as a lubricant/parting agent in the pelleting of the composite mass. Oil has no binding effect in the additive and is compatible with the material into which the additive is to be admixed and accordingly the oil does neither prevent nor obstruct the dispersion of the additive in the material .
The pellets prepared by the above-mentioned prior art process usually have an oil content of about 25% by weight. By reducing the oil content to below 25% by weight the amount of energy consumed during the pelleting will increase because, as mentioned above, the oil functions as a lubricant. An oil content of at least 12% is required in the finished pellets in order to permit pelleting.
A high content of oil in the additive is, however, undesirable because oil usually has an adverse effect on the material into which the additive is to be admixed.
Furthermore, it would be desirable to reduce the oil content in the additive in order to increase the content of the active ingredient, viz. the cellulose fibres.
The object of the present invention is to provide a process of the type stated in the introductory part of claim 1 by which cellulose fibre particles with a reduced oil content can be prepared.
This object is achieved by the process according to the invention which is characterized in that the composite mass additionally comprises silica.
It has surprisingly been found that the addition of silica to the composite mass permits a considerable reduction of the oil content while the ability of such a mass to slide through the apparatus in which the mass is, under compression, transformed into particles is not impaired and that the coherence of the particles produced from such a mass is not reduced.
It is assumed that silica functions as a parting and releasing agent. The process according to the invention preferably uses a composite mass comprising, on an anhydrous basis, 2.0-5.0% by weight of silica and 5.0- 15.0% by weight of oil, preferably 2.5-3.5% by weight of silica and 10.0- 14.0% by weight of oil .
In the context of the present invention "silica" means silicium dioxide.
The oil used in the process of the invention may be any suitable oil product.
The cellulose fibres used in the process of the invention may be any type, e.g. cellulose fibres prepared by processing waste paper material such as newspapers.
A preferred embodiment of the invention is characterized in that the composite mass further comprises water.
Water serves as an additional lubricating and releasing agent in the apparatus in which the compression of the composite mass is performed.
A special embodiment of the invention is characterized in that a pelleting press is used to transform the composite mass into particles.
A further special embodiment of the invention is characterized in that a pair of rollers is used for transforming the composite mass into particles.
Depending on the formulating apparatus used, the particles prepared by the process of the invention may e.g. be in the form of pellets with a cylindrical shape, granules or flakes.
The invention further relates to cellulose fibre particles.
The cellulose fibre particles according to the invention are charac- terized in that they comprise cellulose fibres in an amount of 80.0-93.0% by weight, oil in an amount of 5.0-15.0% by weight, and silica in an amount of 2.0-5.0% by weight. A preferred embodiment of the invention is characterized in that the cellulose fibre particles comprise mineral fibres in an amount of 82.5- 87.5% by weight, oil in an amount of 10.0-14.0% by weight, and silica in an amount of 2.5-3.5% by weight.
In the following the invention will be further described with reference to the below examples.
Example 1
Cellulose fibre particles of the invention were prepared using the process of the invention.
The cellulose fibre starting material is a mixture of various newspapers. The newspaper material is decomposed in an Acta crusher and finely divided in a shredder to which silica of the type Elkern Microsilica\ from Elkern Materials is added by means of a vibrating metering device.
The mixture of finely divided newspaper material and silica is thereafter milled in a FCC 10 hammer mill provided with a sieve having openings with a diameter of 2 mm to effect an efficient mixing of newspaper material and silica.
The resulting fibre mixture is by means of a conveyor belt led from the hammer mill via a belt weigher to a cascade mixer. Oil of the type Mobilsol 41 is heated to 90*C in a heat exchanger and together with steam injected into the fibre mixture. The dosing of the oil is controlled electronically on the basis of the amount of fibre mixture supplied to the cascade mixer, the amount being measured on the belt weigher.
Optionally, water is added to the mixture in the cascade mixer in order to facilitate the subsequent pelleting of the mixture, vide below.
The mixture obtained in the cascade mixer is thereafter pelleted in a Swiss Co bi pelleting press provided with a matrix having openings with a diameter of 3 mm and a length of 4 mm. Various operational parameters for two experiments will appear from Table 1.
Table 1
Experiment 1 2
Silica, kg per hour 16 16 Cellulose fibres, kg per hour 400 400
Oil, kg per hour 27 27
Water, kg per hour 27 0
Injection of steam into cascade mixer Yes Yes
Temp, of mixture in cascade mixer, *C 80 80 Energy consumption in pelleting press, Amperes 32 40
Composition of extruded product (Anhydrous basis)
Silica, % by weight 3.6 3.6
Cellulose fibres, % by weight 90.3 90.3 Oil, % by weight 6.1 6.1
The extrusion proceeded with no tendency of clotting of the openings and with no tendency of overheating of the matrix.
The resulting fibre pellets had a cylindrical shape with a diameter of about 3 mm and a length of 3-6 mm. The pellets had a good coherence and a good ability to be mixed with bitumen.
Accordingly, it can be concluded that the use of the process of the invention permits the preparation of cellulose fibre particles with an oil content of 6.1% by weight.
Example I
Using the process described in Example 1, 1070 kg of pellets were prepared with a diameter of about 3 mm and a length of 3-6 mm and having the following composition: Cellulose fibres 84.5% by weight, oil 12.2% by weight, and silica 3.3% by weight. Water was added to the mixture in the cascade mixer in order to facilitate the pelleting.
The energy consumption in the pelleting press during the extrusion was 40-45 Amperes.
The resulting pellets had a good coherence and they remained sub¬ stantially intact during handling, packaging, transportation and processing in feeding apparatus in connection with the addition to a bitumen product.
1070 kg of fibre pellets were supplied to a feeding box from which the pellets through a lock were continuously fed to an Ermont drum mixer containing bitumen. In the drum mixer the fibre pellets were broken up into single fibres which were dispersed throughout the bituminous mass.
The resulting bituminous mixture had a fibre content of 0.25% by weight.
The pellets used were highly flowable and the feeding proceeded without problems like clotting in the feeding box.
The breaking up of the pellets proceeded without any problems and was complete.
The resulting bituminous product containing fibres was laid out on a section of a motorway.

Claims

C l a i m s
1. A process for producing cellulose fibre particles for use as an additive, wherein a composite mass comprising cellulose fibres and oil is prepared and thereafter the composite mass is, under compression, transformed into particles, c h a r a c t e r i z e d in that the composite mass further comprises silica.
2. The process according to claim 1, c h a r a c t e r i z e d in using a composite mass comprising 2.0-5.0% by weight of silica and 5.0-
15.0% by weight of oil .
3. The process according to claim 2, c h a r a c t e r i z e d in using a composite mass comprising 2.5-3.5% by weight of silica and 10.0- 14.0% by weight of oil.
4. The process according to any one of the preceding claims, c h a ¬ r a c t e r i z e d in that the composite mass further comprises water.
5. The process according to any one of the preceding claims, c h a ¬ r a c t e r i z e d in using an extruder to transform the composite mass into particles.
6. The process according to any one of claims 1-3, c h a r a c t e - r i z e d in using a pair of rollers to transform the composite mass into particles.
7. Cellulose fibre particles, c h a r a c t e r i z e d in that they comprise cellulose fibres in an amount of 80.0-93.0% by weight, oil in an amount of 5.0-15.0% by weight, and silica in an amount of 2.0-5.0% by weight.
8. The cellulose fibre particles according to claim 7, c h a r a c ¬ t e r i z e d in that they comprise cellulose fibres in an amount of 82.5-87.5% by weight, oil in an amount of 10.0-14.0% by weight, and silica in an amount of 2.5-3.5% by weight.
PCT/DK1995/000401 1994-10-12 1995-10-10 Process for producing cellulose fibre particles and cellulose fibre particles WO1996011980A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK1180/94 1994-10-12
DK118094 1994-10-12

Publications (1)

Publication Number Publication Date
WO1996011980A1 true WO1996011980A1 (en) 1996-04-25

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998038250A1 (en) * 1997-02-28 1998-09-03 Ingvar Tuft Method and fibre pellets for producing fibrous asphalt
WO1998044046A1 (en) * 1997-03-27 1998-10-08 Aggregate Industries Uk Limited Road surfacing composition
WO2001053417A2 (en) * 2000-01-19 2001-07-26 SCHÜMANN SASOL GmbH Method for producing a bituminous mixture, compact for the implementation of said method and bituminous mixture for road coverings
WO2004056613A1 (en) * 2002-12-20 2004-07-08 Schmidt Axel H Damping material and method for the production thereof
EP1580225A1 (en) * 2004-03-23 2005-09-28 Saint-Gobain Revetex S.r.l. Additive for reinforcing bitumen matrices

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943079A (en) * 1974-03-15 1976-03-09 Monsanto Company Discontinuous cellulose fiber treated with plastic polymer and lubricant
DE3223178C1 (en) * 1982-06-22 1984-03-22 Fels-Werke Peine-Salzgitter Gmbh, 3380 Goslar Process for producing organic fibres coated with mineral substances
WO1988008438A1 (en) * 1987-05-01 1988-11-03 Stephan Rettenmaier Fibre-filled granules
DE3736215A1 (en) * 1987-10-26 1989-05-03 Juergen Dipl Chem Dr Kuether Pourable, loose bitumen mixture, process for the preparation thereof, and the use thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3943079A (en) * 1974-03-15 1976-03-09 Monsanto Company Discontinuous cellulose fiber treated with plastic polymer and lubricant
DE3223178C1 (en) * 1982-06-22 1984-03-22 Fels-Werke Peine-Salzgitter Gmbh, 3380 Goslar Process for producing organic fibres coated with mineral substances
WO1988008438A1 (en) * 1987-05-01 1988-11-03 Stephan Rettenmaier Fibre-filled granules
DE3736215A1 (en) * 1987-10-26 1989-05-03 Juergen Dipl Chem Dr Kuether Pourable, loose bitumen mixture, process for the preparation thereof, and the use thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998038250A1 (en) * 1997-02-28 1998-09-03 Ingvar Tuft Method and fibre pellets for producing fibrous asphalt
WO1998044046A1 (en) * 1997-03-27 1998-10-08 Aggregate Industries Uk Limited Road surfacing composition
GB2338486A (en) * 1997-03-27 1999-12-22 Aggregate Ind Uk Ltd Road surfacing composition
GB2338486B (en) * 1997-03-27 2000-08-09 Aggregate Ind Uk Ltd Road surfacing composition
WO2001053417A2 (en) * 2000-01-19 2001-07-26 SCHÜMANN SASOL GmbH Method for producing a bituminous mixture, compact for the implementation of said method and bituminous mixture for road coverings
WO2001053417A3 (en) * 2000-01-19 2002-02-07 Schuemann Sasol Gmbh Method for producing a bituminous mixture, compact for the implementation of said method and bituminous mixture for road coverings
WO2004056613A1 (en) * 2002-12-20 2004-07-08 Schmidt Axel H Damping material and method for the production thereof
EP1580225A1 (en) * 2004-03-23 2005-09-28 Saint-Gobain Revetex S.r.l. Additive for reinforcing bitumen matrices

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