Heat-resistant crosslinkable fluororubber composition, heat-resistant crosslinkable fluororubber molded article, heat-resistant product, and method for manufacturing heat-resistant crosslinkable fluororubber molded article

Abstract

The present invention provides a heat-resistant crosslinkable fluororubber composition that exhibits high levels of mechanical properties and heat resistance when molded, making it applicable to high-performance applications, as well as a heat-resistant crosslinkable fluororubber molded article and heat-resistant product thereof, and a method for manufacturing a heat-resistant crosslinkable fluororubber molded article. [Solution] A heat-resistant crosslinkable fluororubber composition containing silane graft rubber obtained by grafting 2 to 15 parts by mass of a silane coupling agent with 100 parts by mass of a base rubber containing fluororubber, 20 to 100 parts by mass of zinc oxide, 0 to 30 parts by mass of an inorganic filler other than zinc oxide, and a silanol condensation catalyst with respect to 100 parts by mass of the base rubber, a heat-resistant crosslinkable fluororubber molded article and a heat-resistant product obtained by crosslinking the heat-resistant crosslinkable fluororubber composition after molding by a specific process.

Claims

1. A heat-resistant crosslinkable fluororubber composition comprising: a silane graft rubber obtained by grafting 2 to 15 parts by mass of a silane coupling agent having graft reaction sites onto 100 parts by mass of a base rubber containing fluororubber; and 20 to 100 parts by mass of zinc oxide, 0 to 30 parts by mass of an inorganic filler other than zinc oxide, and a silanol condensation catalyst, per 100 parts by mass of the base rubber.

2. The heat-resistant crosslinkable fluororubber composition according to claim 1, comprising 0.5 to 20 parts by mass of an inorganic filler other than zinc oxide per 100 parts by mass of the base rubber.

3. The heat-resistant crosslinkable fluororubber composition according to claim 1, wherein the inorganic filler other than zinc oxide contains silica.

4. The heat-resistant crosslinkable fluororubber composition according to claim 1, wherein the inorganic filler other than zinc oxide contains amorphous silica.

5. The heat-resistant crosslinkable fluororubber composition according to claim 1, comprising 20 to 50 parts by mass of zinc oxide per 100 parts by mass of the base rubber.

6. The heat-resistant crosslinkable fluororubber composition according to claim 1, wherein the fluororubber is a tetrafluoroethylene-propylene copolymer rubber.

7. A heat-resistant crosslinked fluororubber molded article obtained by crosslinking a heat-resistant crosslinkable fluororubber composition according to any one of claims 1 to 6.

8. A heat-resistant product comprising a heat-resistant crosslinked fluororubber molded article as described in claim 7.

9. The heat-resistant product according to claim 8, wherein the heat-resistant crosslinked fluororubber molded body is a coating layer for an electric wire or optical fiber cable.

10. A method for producing a heat-resistant crosslinked fluororubber molded article according to claim 7, Step (1) to prepare a heat-resistant crosslinkable fluororubber composition by mixing 0.01 to 0.5 parts by mass of organic peroxide, 20 to 100 parts by mass of zinc oxide, 0 to 30 parts by mass of inorganic filler other than zinc oxide, 2 to 15 parts by mass of silane coupling agent, and silanol condensation catalyst with 100 parts by mass of base rubber containing fluororubber, Step (2) involves molding the heat-resistant crosslinkable fluororubber composition obtained in step (1) to obtain a molded article, A method for producing a heat-resistant crosslinked fluororubber molded article, comprising the steps of: (3) bringing the molded article obtained in step (2) into contact with water to obtain a heat-resistant crosslinked fluororubber molded article.

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