Crosslinkable fluorine rubber composition, fluorine rubber molded article, and method for producing the same
AssigneeDaikin Industries, Ltd.
InventorsKouhei Takemura, Tomihiko Yanagiguchi
Life of this patent
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Abstract
Provided is a cross-linkable fluororubber composition capable of giving a fluororubber cross-linked molded article that has excellent mechanical strength and low friction properties. The cross-linkable fluororubber composition includes a coagulum obtained by co-coagulating a fluororubber (A) and a fluororesin (B).
Claims8
A fluororubber molded article obtained by cross-linking a cross-linkable fluororubber composition comprising a coagulum obtained by co-coagulating a fluororubber (A) and a fluororesin (B), and heat-treating the cross-linked fluororubber composition at a temperature higher than a melting point of the fluororesin (B) by 5° C. or more for 1 minute to 48 hours,
- wherein the fluororubber (A) is a copolymer containing a vinylidene fluoride unit,
- the fluororesin (B) is tetrafluoroethylene/hexafluoropropylene copolymer, and
- a mass ratio (A)/(B) of the fluororubber (A) to the fluororesin (B) is 60/40 to 97/3.
A method for producing a fluororubber molded article, comprising
- (I) a step of obtaining a cross-linkable fluororubber composition comprising a coagulum obtained by co-coagulating a fluororubber (A) and a fluororesin (B) by co-coagulating the fluororubber (A) and the fluororesin (B), wherein the fluororubber (A) is a copolymer containing a vinylidene fluoride unit,
- the fluororesin (B) is tetrafluoroethylene/hexafluoropropylene copolymer, and
- a mass ratio (A)/(B) of the fluororubber (A) to the fluororesin (B) is 60/40 to 97/3;
- (II) a molding and cross-linking step of obtaining a cross-linked molded article by molding and cross-linking the cross-linkable fluororubber composition;
- and
- (III) a heat-treatment step of obtaining a fluororubber molded article by heating the cross-linked molded article at a temperature higher than a melting point of the fluororesin (B) by 5° C. or more for 1 minute to 48 hours.
Dependencies are inferred from the claim text.