WO2000055252A1 - Compositions de fluoropolymere moulables, resistant a l'usure - Google Patents

Compositions de fluoropolymere moulables, resistant a l'usure Download PDF

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Publication number
WO2000055252A1
WO2000055252A1 PCT/US1999/015740 US9915740W WO0055252A1 WO 2000055252 A1 WO2000055252 A1 WO 2000055252A1 US 9915740 W US9915740 W US 9915740W WO 0055252 A1 WO0055252 A1 WO 0055252A1
Authority
WO
WIPO (PCT)
Prior art keywords
volume
fluoropolymer
moldable
tetrafluoroethylene
composition according
Prior art date
Application number
PCT/US1999/015740
Other languages
English (en)
Inventor
James S. Temple
Robert Romeo
Original Assignee
Dyneon Llc
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 Dyneon Llc filed Critical Dyneon Llc
Priority to AU49873/99A priority Critical patent/AU4987399A/en
Publication of WO2000055252A1 publication Critical patent/WO2000055252A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
    • C08L77/06—Polyamides derived from polyamines and polycarboxylic acids
    • C08L77/08—Polyamides derived from polyamines and polycarboxylic acids from polyamines and polymerised unsaturated fatty acids

Definitions

  • This invention relates to a moldable fluoropolymer compound having improved wear resistance. More particularly it relates to fluoropolymer compounds comprised of a mixture of polyparaphenylene terephthalate (hereinafter referred to as aramid) and a fluoropolymer that comprises a homopolymer of tetrafluoroethylene (TFE) or a copolymer of TFE with up to 10% by weight of a monomer copolymerizable with TFE.
  • aramid polyparaphenylene terephthalate
  • TFE tetrafluoroethylene
  • JP-B 4-65,866 discloses an article molded from a composition of 100 parts by weight of polyphenylene sulphide (PPS), 3 to 60 parts by weight of a fluoroplastic and 3 to 60 parts by weight of an aromatic polyamide.
  • PPS polyphenylene sulphide
  • JP-A 62-10,166 discloses an article made from a composition of 40 to 75% by volume of a heat-resistant synthetic resin such as PPS, 5 to 25% by volume of an aromatic polyamide, 5 to 30% by volume of a polytetrafluoroethylene (PTFE) and 5 to 35% by volume of lead oxide.
  • a heat-resistant synthetic resin such as PPS
  • PPS polytetrafluoroethylene
  • PTFE polytetrafluoroethylene
  • U.S. Patent 5,618,873 discloses a sliding member made by molding a composition of from 10 to 30% by volume of an aromatic polyamide, 5 to 20 by volume of PTFE, 0.1 to less than 5% by volume of lead oxide, and at least one other heat resistant synthetic resin, provided that the total of all components totals 100% by volume. While such compounds have been somewhat successful, the number of components necessary to achieve the desired result is large. This requires maintaining a large inventory of numerous materials; adds to the complexity of manufacturing the compounds; and in some cases exposes workers to lead-based compounds.
  • a fluoropolymer that comprises a homopolymer of TFE or a copolymer of TFE with up to 10% by weight of a monomer copolymerizable with TFE to provide a moldable composition.
  • the fluoropolymer comprises the matrix of the compound. As such, it comprises at least 50% by volume of the combined volume of the aramid and the fluoropolymer.
  • the present invention comprises a moldable fluoropolymer compound containing a defined volume of aramid and a defined volume of the fluoropolymer.
  • the present invention further comprises molded articles prepared from the moldable composition and a process for improving the wear resistance of molded polytetrafluoroethylene.
  • the wear-resistant composition contain aramid at a level of from 20 to 50 (preferably 30 to 45, most preferably 35 to 40) % by volume of the combined volume of the aramid and the fluoropolymer.
  • the composition contains 80 to 50 (preferably 70 to 55, most preferably from 65 to 60) % by volume of the combined volume of the aramid and the fluoropolymer.
  • Other ingredients that may be used include synthetic resins, colorants (e.g., pigments and dyes), ultraviolet light stabilizers, etc. Preferably these other ingredients are heat resistant.
  • the process of the invention comprises the steps of mixing the polytetrafluoroethylene with the aramid to provide the moldable composition of the invention, forming the moldable composition into a desired shape and causing the composition to form a unified mass, typically by heating the composition to a temperature sufficient to melt the fluoropolymer, allowing the components to form the unified mass, and then solidifying the unified mass.
  • the aramid useful in the invention is a known material and has the repeating structure
  • These materials typically are provided in the form of a fiber whose length can vary widely
  • Average particle size means the average of the largest dimension of the aramid
  • aramids examples include TECHNORA and CONEX aramid from Teijin, KEVLAR aramid from DuPont and TWARON aramid from Akzo Nobel.
  • the fluoropolymer useful in the invention is a crystalline material that is either a homopolymer of TFE or a copolymer of TFE with up to 10% by weight of at least one other monomer copolymerizable with TFE
  • the comonomer comprises from 0.001 to 5, more preferably from 0 001 to 1 and most preferably from 001 to 0 5 of the fluoropolymer
  • examples of such other monomers include perfluoro(alkylvinyl ether), hexafluoropropylene, vinylidene fluoride, ethylene, propylene and the like
  • the comonomer is perfluor(alkylvinyl ether)
  • useful perfluoro(alkyl vinyl ethers) include the methyl, ethyl and propyl vinyl ethers
  • the invention and its improved wear characteristics are illustrated in the following examples.
  • HostaflonTM TF1750 is a suspension polymerized PTFE It is a non-free flowing, high molecular weight polytetrafluoroethylene It has a bulk density of 370 kg/m 3 (DIN 53466) and an average particle size of 20 ⁇ m (ASTM D 4894) TWARONTM
  • 5011 is a powder having a specific gravity of 1 4393 and an average particle size of 55 ⁇ m.
  • the compounds were molded into cylindrical billets which were then machined into cylindrical test specimens having a diameter of 2 858 cm and a thickness of 0 476 cm
  • the test specimens were each evaluated for wear resistance against a steel surface under dry conditions on a Lewis Wear Tester available from Lewis Research, Inc , Lewes, Delaware Two linear speeds, low speed and high speed, were used to evaluate wear
  • the low speed was 100 ft/min (30 5 m/min) and the high speed was 400 ft/min (122 m/min)
  • the level of pressure was increased in a step-wise manner at each speed and the resistance to wear was observed The higher the combination of speed times pressure, the more aggressive the test conditions
  • the speed times pressure value is referred to hereinafter as the PV value Failure of each test specimen occurred when wear resistance equaled zero Wear resistance is a calculated value equal to the PV value divided by the observed wear rate in in/min
  • the higher the PV value at zero wear resistance, the more wear resistant the compound Table 1 reports the PV limits of the compounds tested
  • fluoropolymer/aramid compounds containing less than 20 volume % aramid exhibit little improvement in wear resistance
  • those containing at least 20 volume % aramid show a dramatic increase in wear resistance

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Cette invention se rapporte à une composition de fluoropolymère moulable, possédant une résistance à l'usure améliorée. Cette composition contient un mélange de téréphtalate de polyparaphénylène (appelé ici aramide) et d'un fluoropolymère, qui comprend un homopolymère de tétrafluoroéthylène (TFE) ou un copolymère de TFE avec au maximum 10 % en poids d'un monomère copolymérisable avec le TFE.
PCT/US1999/015740 1999-03-15 1999-07-13 Compositions de fluoropolymere moulables, resistant a l'usure WO2000055252A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49873/99A AU4987399A (en) 1999-03-15 1999-07-13 Moldable wear-resistant fluoropolymer compositions

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12454699P 1999-03-15 1999-03-15
US60/124,546 1999-03-15

Publications (1)

Publication Number Publication Date
WO2000055252A1 true WO2000055252A1 (fr) 2000-09-21

Family

ID=22415505

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/015740 WO2000055252A1 (fr) 1999-03-15 1999-07-13 Compositions de fluoropolymere moulables, resistant a l'usure

Country Status (2)

Country Link
AU (1) AU4987399A (fr)
WO (1) WO2000055252A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6652498B1 (en) 1999-11-08 2003-11-25 Mcneil-Ppc, Inc. Tapered compound sanitary napkin
WO2005118714A1 (fr) * 2004-05-28 2005-12-15 E.I. Dupont De Nemours And Company Compositions de fluoropolymère résistantes à l’abrasion contenant des micro-pulpes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5230952A (en) * 1991-06-17 1993-07-27 Coltec Industries Inc. Sintered composite friction material comprising fluorocarbon resin
JPH06122887A (ja) * 1992-10-12 1994-05-06 Daido Metal Co Ltd 摺動部材用組成物
GB2291879A (en) * 1994-08-04 1996-02-07 Daido Metal Co Sliding member
EP0939106A1 (fr) * 1998-02-28 1999-09-01 Federal-Mogul Wiesbaden GmbH Couche de glissement et matériau multicouche

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5230952A (en) * 1991-06-17 1993-07-27 Coltec Industries Inc. Sintered composite friction material comprising fluorocarbon resin
JPH06122887A (ja) * 1992-10-12 1994-05-06 Daido Metal Co Ltd 摺動部材用組成物
GB2291879A (en) * 1994-08-04 1996-02-07 Daido Metal Co Sliding member
EP0939106A1 (fr) * 1998-02-28 1999-09-01 Federal-Mogul Wiesbaden GmbH Couche de glissement et matériau multicouche

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 121, no. 20, 14 November 1994, Columbus, Ohio, US; abstract no. 232690, XP002122154 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6652498B1 (en) 1999-11-08 2003-11-25 Mcneil-Ppc, Inc. Tapered compound sanitary napkin
WO2005118714A1 (fr) * 2004-05-28 2005-12-15 E.I. Dupont De Nemours And Company Compositions de fluoropolymère résistantes à l’abrasion contenant des micro-pulpes
US7531113B2 (en) 2004-05-28 2009-05-12 E.I. Du Pont De Nemours And Company Abrasion resistant fluoropolymer compositions containing micropulp

Also Published As

Publication number Publication date
AU4987399A (en) 2000-10-04

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