Fluororubber composition, crosslinked fluororubber, process for production of the same, and crosslinked fluororubber for o-rings

Abstract

[Problem] To provide a fluororubber composition that does not suffer from deposition, during extrusion, of a talc component contained in a heat- and low-temperature-resistant colorable fluororubber, that is capable of providing products having performance equal to that of conventional mass-produced materials, and that is capable of substantially reducing the rejection rate in the preparation of green stock; and a process for producing a crosslinked fluororubber product. [Means for Solving the Problem] A fluororubber composition comprising a fluororubber containing a fluoropolymer that is crosslinkable with a peroxide; a peroxide crosslinking agent; and a heat-resistant filler containing a calcined talc having a hydrophilic surface; a content of the calcined talc being from 2 to 20 parts by weight based on 100 parts by weight of the fluoropolymer. Preferably, the fluoropolymer that is crosslinkable with a peroxide is a low-temperature-type terfluoropolymer having a TR10 value of from -40 to -25°C; and more preferably, the low-temperature-type terfluoropolymer is a vinylidene fluoride / perfluoro(methyl vinyl ether) / tetrafluoroethylene terfluoropolymer.

Description

technical field [0001] The present invention relates to a colorable fluororubber composition having low temperature and heat resistance, a crosslinked fluororubber and a manufacturing method thereof, and a crosslinked fluororubber used for an O-ring. A fluororubber composition for preventing talc precipitation, a crosslinked fluororubber, a method for producing the same, and a crosslinked fluororubber for an O-ring. Background technique [0002] Since fluororubber is excellent in oil resistance and heat resistance, it is used in a wide range of applications such as O-rings used in combustion systems of automobiles and the like. [0003] However, fluororubber generally has a higher glass transition temperature than other elastomer materials. If the temperature is below the glass transition temperature, it becomes completely glassy and cannot function as a rubber material. Therefore, it has the disadvantage of poor low temperature resistance. Therefore, fluororubbers excellen...

AI Technical Summary

Problems solved by technology

[0008] That is, there is the following problem: during extrusion, the talc component added to the heat-resistant, low-temperature resistant, and colorable fluororubber is separated at the front end of the metal mouth (die) of the extruder. To some extent, it will be attached to the extruded green embryo as foreign matter

Precipitated talc is a component added to fluororubber, but if it agglomerates in one place, it will inevitably cause the problem of lowering the function of the rubber

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