Fluororubber composition
A fluororubber composition comprising 3 to 20 parts by weight of carbon fibers and 1 to 8 parts by weight of carbon nanotubes based on 100 parts by weight of fluororubber. The crosslinked molded article obtained from the fluororubber composition has excellent effects of not only imparting oil film retention, but also improving the material strength of fluororubber due to the combined use of carbon nanotubes, which have high reinforcing properties. Further, the fluororubber composition can give a fluororubber crosslinked product excellent in abrasion resistance and pressure resistance.
1 . A transmission sealing member comprising a crosslinked fluororubber composition comprising 10 to 20 parts by weight of carbon fibers and 3 to 5 parts by weight of carbon nanotubes based on 100 parts by weight of fluororubber,
wherein the fluororubber comprises at least one selected from the group consisting of vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer, and vinylidene fluoride-hexafluoropropylene-perfluoroalkyl vinyl ether terpolymer,
wherein the carbon fibers have an average fiber diameter of 5 to 20 μm, an average fiber length of 10 to 200 μm, and a Mohs hardness of 3 to 6.
2 . The transmission sealing member according to claim 1 , wherein the fluororubber composition further comprises 3 to 20 parts by weight of polytetrafluoroethylene.
3 . The transmission seal member according to claim 1 , wherein the transmission seal member is a continuously variable vehicle pulley seal member.
4 . The transmission sealing member according to claim 1 , wherein the carbon fibers have an average fiber diameter of 5 to 15 μm, an average fiber length of 20 to 100 μm, and a Mohs hardness of 4 to 6.
5 . The transmission sealing member according to claim 1 , wherein the carbon nanotubes have an average diameter of about 1 to 20 nm.
6 . The transmission sealing member according to claim 5 , wherein the carbon nanotubes have an average diameter of 5 to 15 nm, an average fiber length of 1-18 μm, and a BET specific surface area of 100-500 m 2 /g.
7 . The transmission sealing member according to claim 6 , wherein the carbon fibers have an average fiber diameter of 5 to 15 μm, an average fiber length of 20 to 100 μm, and a Mohs hardness of 4 to 6.