EP0916001B1 - Gasket paper - Google Patents

Gasket paper Download PDF

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Publication number
EP0916001B1
EP0916001B1 EP97926103A EP97926103A EP0916001B1 EP 0916001 B1 EP0916001 B1 EP 0916001B1 EP 97926103 A EP97926103 A EP 97926103A EP 97926103 A EP97926103 A EP 97926103A EP 0916001 B1 EP0916001 B1 EP 0916001B1
Authority
EP
European Patent Office
Prior art keywords
mixture
binder
silicate mineral
inorganic binder
polymeric binder
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.)
Expired - Lifetime
Application number
EP97926103A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0916001A1 (en
Inventor
David Geoffrey Hall
Antony Latkowski
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.)
Federal Mogul Technology Ltd
Original Assignee
Federal Mogul Technology Ltd
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 Federal Mogul Technology Ltd filed Critical Federal Mogul Technology Ltd
Publication of EP0916001A1 publication Critical patent/EP0916001A1/en
Application granted granted Critical
Publication of EP0916001B1 publication Critical patent/EP0916001B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H13/00Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10Organic non-cellulose fibres
    • D21H13/20Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26Polyamides; Polyimides
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63Inorganic compounds
    • D21H17/67Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/68Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays

Definitions

  • This invention relates to papers particularly, but not exclusively, suitable for use in fluid sealing applications such as cylinder head gaskets. It is known to make gasket papers from non-asbestos formulations based on other fibres such as glass fibres and/or mineral fibres and including a minor proportion of cellulose as a web-forming agent.
  • GB-A-2138854 and 2138855 disclose cellulose-containing compositions using ball clay as a filler.
  • GB-A-2250302 discloses a gasket material which is cellulose-free and which includes a carefully selected mixture of calcined china clay and ball clay as filler.
  • GB-A-2254346 discloses a high temperature gasket material including glass or carbon fibre staples and temperature tolerants. fillers.
  • GB-A-2093474 and EP-A2-0522441 disclose compositions including aramid fibre staple materials.
  • a method of manufacture of a paper stock for dewatering to paper comprising, by weight, 4-15% aramid fibre pulp, 60-90% silicate mineral, 4-10% polymeric binder, and 2-15% inorganic binder, comprises the steps set out in the precharaterising part of claim 1 further characterised by producing a first mixture containing said aramid fibres and silicate mineral prior to adding the inorganic binder thereto and, prior to adding said inorganic binder, adding to said first mixture a 10% solution of papermakers alum such that the dry content is 1% of the total composition and agitating the mixture to prepare the surface of the silicate mineral by said alum to receive the inorganic binder, and, after addition of said inorganic binder, adding said polymeric binder having a solid content of 50% by weight and dispersing said polymeric binder in the mixture without precipitation thereof.
  • At least some of the silicate mineral is constituted by attapulgite.
  • the inorganic binder is preferably colloidal silica.
  • the polymeric material is preferably nitrile rubber.
  • a particularly preferred paper according to the inventive method comprises by weight, 4-8% aramid fibre pulp, 5-8% polymeric binder, 75-87% silicate mineral and 4-10% colloidal silica. It will be appreciated that in the present context "aramid” is a reference to polyaromatic amide material.
  • the formulations of the present invention may be used in at least two different ways.
  • the use of calcined china clay in combination with colloidal silica lends itself to the product of a paper which can be impregnated with a silicone or other resin such as polybutadiene in order to enhance resistance to and sealabilty against fluids such as water-antifreeze mixtures and oil.
  • a paper which can be impregnated with a silicone or other resin such as polybutadiene in order to enhance resistance to and sealabilty against fluids such as water-antifreeze mixtures and oil.
  • attapulgite it is possible to produce a paper which swells when exposed to water.
  • Such papers can be used without a resin impregnation treatment.
  • the process of the invention leads to a paper stock which is capable of producing gaskets both with and without a post-treatment with a resin impregnant.
  • testing was carried out by bonding the test paper to both sides of a plain steel core, blanking out annular samples of inside diameter 14.7mm and outside diameter 34.5mm. These were then tested, again based on ASTM F1276, by applying an initial stress of 58.6 MPa. After 22 hours at 300°C the residual stress was measured, the stress relaxation calculated and then normalised to a paper thickness of 1.0mm, in the usual way. This procedure was used throughout the following Examples, including tests on paper made according to prior art.
  • a paper was made having the following composition: % by dry weight Fibrillated Aramid Fibre Pulp 8 Calcined China Clay 76 Nitrile Rubber 6 Colloidal Silica 10
  • the aramid fibres were dispersed in water to give a slurry of around 2% solids content by weight. This pulp had a freeness of 50°SR. The pulp was transferred to a mixing vessel and further diluted with water at 40°C. The calcined china clay was added and the mixture agitated. Further water was added to give a slurry having a solids content of approximately 4% by weight. A 10% solution of papermakers alum was added such that the dry content was approximately 1% of the total composition. The mixture was agitated for 2 minutes before adding the colloidal silica as a 30% solids content suspension. The mixture was agitated for a further 5 minutes and nitrile rubber added in latex form, having a solids content of around 50%.
  • the nitrile rubber latex was diluted 5:1 with water before adding to the mix. When fully dispersed the latex was then caused to precipitate onto the fibres and fillers by the addition of a further quantity of papermakers alum solution until the supernatant liquid became clear.
  • a paper was produced from the above stock by the conventional technique of dewatering on a wire mesh, pressing and drying, a polyacrylamide flocculant was used to aid processing.
  • the paper was subsequently calendered to the required density using a conventional 2-bowl calender.
  • the resulting paper had the following properties: Thickness 0.83mm Substance 920gm -2 Density 1100kgm -3 Tensile Strength 4.2 MPa Compression at 34.5 MPa 14.3% Stress Relaxation 24.8%
  • a conventional paper made according to GB 2250302 showed a stress relaxation of 42% by the same test method.
  • a paper was prepared largely as described above from the following formulation. % by dry weight Fibrillated Aramid Fibre Pulp 4 Calcined China Clay 30 Attapulgite 50 Colloidal Silica 10 Nitrile Rubber 6
  • the paper had the following properties: Thickness 0.65mm Substance 860gm -2 Density 1330kgm -3 Tensile Strength 7.0 MPa Compression at 34.5 MPa 15.3% Stress Relaxation 29.8%
  • a sealing test was carried out as described above and the paper was found to seal an internal pressure of 10 bar without detectable leakage at a sealing stress of 10.3 MPa.
  • the paper also sealed 10 bar fluid pressure at a reduced sealing stress of 3.4 MPa.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Sealing Material Composition (AREA)
  • Materials For Medical Uses (AREA)
EP97926103A 1996-06-27 1997-06-12 Gasket paper Expired - Lifetime EP0916001B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9613456A GB2314569B (en) 1996-06-27 1996-06-27 Gasket paper
GB9613456 1996-06-27
PCT/GB1997/001587 WO1997049864A1 (en) 1996-06-27 1997-06-12 Gasket paper

Publications (2)

Publication Number Publication Date
EP0916001A1 EP0916001A1 (en) 1999-05-19
EP0916001B1 true EP0916001B1 (en) 2001-05-23

Family

ID=10795958

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97926103A Expired - Lifetime EP0916001B1 (en) 1996-06-27 1997-06-12 Gasket paper

Country Status (9)

Country Link
EP (1) EP0916001B1 (ja)
JP (1) JP2000513053A (ja)
KR (1) KR20000015807A (ja)
AU (1) AU713243B2 (ja)
BR (1) BR9709944A (ja)
DE (1) DE69704947T2 (ja)
GB (1) GB2314569B (ja)
WO (1) WO1997049864A1 (ja)
ZA (1) ZA975620B (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011053389A1 (de) * 2011-09-08 2013-03-14 Elringklinger Ag Dichtungsanordnung und Verfahren zur Herstellung derselben

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4271228A (en) * 1980-02-04 1981-06-02 Hollingsworth & Vose Company Sheet material containing exfoliated vermiculite
US4330442A (en) * 1980-05-07 1982-05-18 Armstrong World Industries, Inc. Asbestos free gasket forming compositions
GB2093474B (en) * 1981-02-10 1984-10-24 Texon Inc High temperature resistant gasketing material incorporating organic fibers
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
US4786670A (en) * 1987-01-09 1988-11-22 Lydall, Inc. Compressible non-asbestos high-temperature sheet material usable for gaskets
GB9025983D0 (en) * 1990-11-29 1991-01-16 T & N Technology Ltd Non-asbestos flexible sheet material
GB9106806D0 (en) * 1991-04-02 1991-05-22 T & N Technology Ltd Non-asbestos flexible sheet material
DE4113153A1 (de) * 1991-04-23 1992-10-29 Du Pont Int Industriedichtung fuer den einsatz mit dampf
DE4122737A1 (de) * 1991-07-10 1993-01-14 Akzo Nv Zusammensetzung mit kurzfasern aus aramid

Also Published As

Publication number Publication date
ZA975620B (en) 1997-12-29
AU713243B2 (en) 1999-11-25
GB9613456D0 (en) 1996-08-28
DE69704947T2 (de) 2001-09-06
DE69704947D1 (de) 2001-06-28
GB2314569A (en) 1998-01-07
WO1997049864A1 (en) 1997-12-31
BR9709944A (pt) 1999-08-10
JP2000513053A (ja) 2000-10-03
AU3099097A (en) 1998-01-14
EP0916001A1 (en) 1999-05-19
KR20000015807A (ko) 2000-03-15
GB2314569B (en) 2000-01-26

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