CA2073414A1 - Composition containing short aramid fibres - Google Patents

Composition containing short aramid fibres

Info

Publication number
CA2073414A1
CA2073414A1 CA002073414A CA2073414A CA2073414A1 CA 2073414 A1 CA2073414 A1 CA 2073414A1 CA 002073414 A CA002073414 A CA 002073414A CA 2073414 A CA2073414 A CA 2073414A CA 2073414 A1 CA2073414 A1 CA 2073414A1
Authority
CA
Canada
Prior art keywords
short
fibres
aramid fibres
moh
short aramid
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
Application number
CA002073414A
Other languages
French (fr)
Inventor
Maria G. M. M. W. Peters
Udo Schwartzkopff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2073414A1 publication Critical patent/CA2073414A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B30/00—Compositions for artificial stone, not containing binders
    • C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/58—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products
    • D01F6/60—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolycondensation products from polyamides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04—Macromolecular compounds
    • C04B16/06—Macromolecular compounds fibrous
    • C04B16/0608—Fibrilles, e.g. fibrillated films
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K3/1025—Materials in mouldable or extrudable form for sealing or packing joints or covers characterised by non-chemical features of one or more of its constituents
    • C09K3/1028—Fibres
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G3/00—Roughening of fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0088—Compounds chosen for their latent hydraulic characteristics, e.g. pozzuolanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
    • C09K2200/0692—Fibres
    • C09K2200/0695—Polyamide fibres

Abstract

Composition containinq short Aramid fibres Abstract Composition, which contains at least synthetic organic short Aramid fibres and a filler, characterised in that at least some of the fillers have a Moh's hard-ness of between 2 and 9 and in that the short fibres are split into several fibrils at their ends. In particular, the short fibres have crackc, protruding fibrils and/or splitting along the fibre axis. A process for the preparation of this composition is characterised in that short Aramid fibres are mixed with a filler of predeter-mined Moh's hardness using high shear forces.

Description

2~734~

Composition containinq short Aramid fibres Description The present invention relates to a composition which contains at least synthetic organic short Aramid fibres and a filler.
Compositions of this type are described, for example, in EP-A-261 820. The known composition i~ used for the production of fibrous materials. The known composition is less suitable for the production of mouldings which are intended to have particularly high strength, such as, for example, flat seals.
It is therefore the object of the present invention to provide a composition, in particular for the production of mouldings which are intended to have a particularly high strength. It is also the object of the present invention to provide a process for the production of this composition.
This object is achieved according to the inven-tion, for a composition of the initially mentioned type,in that at least some of the fillers have a Moh~s hard-ness of between 2 and 9 and in that the short fibres are split into several fibrils at their ends. In particular, the short fibres have cracks, protruding fibrils and, preferably, splitting along the fibre axis.
Fillers which have proved particularly suitable are Al4Si40lo(0H)B having a Moh's hardness of about 2 to 2.5 and zinc oxide having a Moh's hardness of about 4.
The Moh's hardness is determined by the method which is described in Fahrenwald Trans. Am. Inst. Mining. Mat.
Engrs. 112, 88, 1943.
The specified ob~ect according to the invention can be achieved, in the case of a process in which the short Aramid fibres and at least one filler are mixed, in that 20 - 900 ~ by weight, based on the weight of the short Aramid fibres, of a filler which has at least a .. .. ... .
.
:. :
.

~07~a~

Moh's hardness of 2 but at most a Moh's hardness which, as a function of the microcavities having a size H which are contained on average in the short Aramid fibres, satisfies the condition M = 2.75 x 10 3 X H - 2 the sizes H of the micro cavities being able to assume values of between 2000 and 5000 ~ (Angstrom), are added to the short Aramid fibres and in that the resulting mixture is introduced into a mixer, which is capable of transferring high shear forces to the mixture, and is mixed until the ends of the short Aramid fibres in the mixture have severa~ split ends. Fillers which have proved most suitable are, in particular, minerals, such as, for example, kaolin, magnesium oxide, white clay, zinc oxide, aluminium oxide, barytes, quartz or mineral fibres (obtainable under the trade names Inorphil and Rockwool). However, the only fillers which can be used are those which have the requisite Moh's hardness.
Mixers able to transfer high shear forces which can be used are those mixers known for the production of Aramid pulp which possess a high power consumption and a low rotor speed. The so-called Banburry mixer with tangential rotor blad~s has proved particularly suitable in this context. However, mixers in which the mixture is abrasively treated between two discs are also suitable.
In the case of the ma~ority of mixers, care must be taken that they are well cooled. In the case of Banburry mixers in particular, it has proved particularly advantageous to maintain a temperature of at most 80C in the composition during mixing.
Short Aramid fibres which have an average length of about 6 mm are particularly suitable for mixing into the composition. An excellent composition for the production of mouldings, in particular of flat seals, is achieved in this way.
The invention is illustrated in more detail with reference to the following drawings.
In the drawings .

2 ~ 7 ~
Figure 1 shows a short Aramid fibre of the type known from the known prior art, and Figure 2 shows a short Aramid fibre as used according to the inven-tion.
Figure l shows a short Aramid fibre 1 according to the prior art. The short fibre 1 has frayed ends 2 and a few, not very pronounced, fibrils 3 as well as a few cracXs 4 along the fibre axis.
The short Aramid fibre 11 contained in the composition according to the invention is shown in Figure 2. In contrast to the prior art, the short fibre 11 has several split fibrils 12 at its ends. The fibrils 13 and the cracks 14 along the fibre axis are more frequent and more pronounced than in the prior art and, in addition, the short fibres 11 can also have splitting 15 along the fibre axis.

Claims (8)

1. Composition, which contains at least synthetic organic short Aramid fibres (11) and a filler, charac-terised in that at least some of the fillers have a Moh's hardness of between 2 and 9 and in that the short fibres (11) are split into several fibrils (12) at their ends.
2. Composition according to Claim 1, characterised in that the short fibres (11) have cracks (14) and protruding fibrils (13) along the fibre axis.
3. Composition according to Claim 1 or 2, charac-terised in that the short fibres (11) have splitting (15) along the fibre axis.
4. Composition according to one or more of Claims 1 to 3, characterised in that the filler contains Al4Si4O10(OH)8 having a Moh's hardness of about 2 to 2.5.
5. Composition according to one or more of Claims 1 to 3, characterised in that the filler contains zinc oxide having a Moh's hardness of about 4.
6. Process for the preparation of a composition according to one or more of Claims 1 to 5, in which short Aramid fibres are mixed with at least one filler, charac-terised in that 20 - 900 % by weight, based on the weight of the short Aramid fibres, of a filler which has at least a Moh's hardness of 2 but at most a Moh's hardness which, as a function of the microcavities having a size H which are contained on average in the short Aramid fibres, satisfies the condition M = 2.75 x 10 3 X H - 2 the size H of the microcavities being able to assume values of between 2000 and 5000 .ANG., and optionally further fillers are added to the short Aramid fibres and in that the resulting mixture is mixed in a mixer, which is capable of transferring high shear forces to the mixture, until the ends of the short Aramid fibres in the mixture have several split ends.
7. Process according to Claim 6, characterised in that the composition is cooled to a temperature of at most 80°C during the mixing operation.
8. Process according to Claim 6 or 7, characterised in that short Aramid fibres having an average length of about 6 mm are used for mixing.
CA002073414A 1991-07-10 1992-07-09 Composition containing short aramid fibres Abandoned CA2073414A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4122737A DE4122737A1 (en) 1991-07-10 1991-07-10 COMPOSITION WITH SHORT FIBERS MADE OF ARAMID
DEP4122737.9 1991-07-10

Publications (1)

Publication Number Publication Date
CA2073414A1 true CA2073414A1 (en) 1993-01-11

Family

ID=6435779

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002073414A Abandoned CA2073414A1 (en) 1991-07-10 1992-07-09 Composition containing short aramid fibres

Country Status (9)

Country Link
EP (1) EP0522441A3 (en)
JP (1) JPH06122821A (en)
KR (1) KR930002558A (en)
AU (1) AU1957892A (en)
BR (1) BR9202519A (en)
CA (1) CA2073414A1 (en)
DE (1) DE4122737A1 (en)
TW (1) TW201796B (en)
ZA (1) ZA924673B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10508342A (en) * 1994-05-16 1998-08-18 ヘキスト・セラニーズ・コーポレーション Cut resistant fiber with filler
GB2314569B (en) * 1996-06-27 2000-01-26 T & N Technology Ltd Gasket paper
EP0994215B1 (en) 1998-10-15 2003-06-04 Teijin Limited Wholly aromatic polyamide fiber synthetic paper sheet
JP3475234B2 (en) * 1998-10-15 2003-12-08 帝人テクノプロダクツ株式会社 Aromatic polyamide fiber paper
CA2412599C (en) 2000-06-28 2011-09-27 Dow Global Technologies Inc. Plastic fibers for improved concrete
KR20100083794A (en) * 2007-10-17 2010-07-22 데이진 아라미드 게엠베하 Method for producing high-performance chopped fiber having fibrils, high-performance chopped fiber having fibrils, and articles comprising the same
JP5425304B2 (en) * 2009-06-23 2014-02-26 コーロン コンストラクション カンパニーリミテッド Reinforcing fiber and shotcrete composition containing the same

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2226932B2 (en) * 1972-06-02 1976-03-18 Basf Ag, 6700 Ludwigshafen GLASS FIBER REINFORCED THERMOPLASTIC MOLDING COMPOUNDS PIGMENTED WITH INORGANIC PIGMENTS
US4374211A (en) * 1981-09-15 1983-02-15 Thiokol Corporation Aramid containing friction materials
US4387178A (en) * 1981-11-02 1983-06-07 Rogers Corporation Compressible soft asbestos free gasket material
US4492779A (en) * 1981-12-07 1985-01-08 Thiokol Corporation Aramid polymer and powder filler reinforced elastomeric composition for use as a rocket motor insulation
DE3221266A1 (en) * 1982-06-04 1983-12-08 Frenzelit Werke GmbH & Co KG, 8582 Bad Berneck ASBEST-FREE SEALING MATERIAL FOR TECHNICAL PURPOSES
US4477526A (en) * 1982-06-18 1984-10-16 E. I. Du Pont De Nemours And Company High strength aramid spun yarn
GB2138854B (en) * 1983-04-27 1986-03-26 T & N Materials Res Ltd Gasket paper
GB2138855B (en) * 1983-04-27 1986-03-26 T & N Materials Res Ltd Gasket paper
EP0152490A1 (en) * 1983-11-08 1985-08-28 Jose Manuel Restrepo Improved fibre-reinforced cement and process
DE3341461A1 (en) * 1983-11-17 1985-05-30 Basf Ag, 6700 Ludwigshafen AREA GASKET MATERIAL
US4552805A (en) * 1984-12-17 1985-11-12 E. I. Du Pont De Nemours And Company Composites reinforced with high strength aramid fibers having fibrillated ends
GB8621680D0 (en) * 1986-09-09 1986-10-15 Du Pont Filler compositions
US4811908A (en) * 1987-12-16 1989-03-14 Motion Control Industries, Inc. Method of fibrillating fibers
EP0322838B1 (en) * 1987-12-28 1994-04-06 Teijin Limited Process for producing shaped wholly aromatic polyamide resin composition articles
JPH03161547A (en) * 1989-11-16 1991-07-11 Asahi Chem Ind Co Ltd Production of base material for composite material composed of fibrilized polybenzoxazole-based fiber
GB9025983D0 (en) * 1990-11-29 1991-01-16 T & N Technology Ltd Non-asbestos flexible sheet material
DE4109681C1 (en) * 1991-03-23 1992-11-05 Goetze Ag, 5093 Burscheid, De

Also Published As

Publication number Publication date
KR930002558A (en) 1993-02-23
EP0522441A3 (en) 1993-09-08
TW201796B (en) 1993-03-11
JPH06122821A (en) 1994-05-06
AU1957892A (en) 1993-01-14
DE4122737A1 (en) 1993-01-14
BR9202519A (en) 1993-03-16
ZA924673B (en) 1993-03-31
EP0522441A2 (en) 1993-01-13

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Legal Events

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FZDE Dead