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A fluororubber and composition technology, applied in other chemical processes, chemical instruments and methods, etc., can solve problems such as difficulty in ensuring sealing performance, leakage, etc.
Pending Publication Date: 2018-01-02
NOK CORP
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Problems solved by technology
If foaming occurs near the sealing (sliding) surface, it becomes difficult to ensure stable sealing performance, and in the worst case, leakage occurs
Method used
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Examples
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Embodiment 1
[0061] Solid state fluororubber (DuPont products Viton A-500) 80 parts by weight
[0062] Liquid fluororubber (Daikin products Daiel G-101, 20 parts by weight
[0063] Viscosity (100℃) is 1200cps)
[0064] 20 parts by weight of wollastonite treated with silane coupling agent containing epoxy groups
[0065] (NYCO product Wollastcoat 10222, aspect ratio 5)
[0066] SRF carbon black 25 parts by weight
[0067] MgO 3 parts by weight
[0068] Ca(OH) 2 6 parts by weight
[0069] Processing aid (DuPont Dow Elastomers product VPA No. 2) 2 parts by weight
[0070] Bisphenol AF 1.5 parts by weight
[0071] 1.5 parts by weight of quaternary phosphonium salt (Viton VC#20, product of DuPont Company)
[0072] An unvulcanized fluororubber composition is prepared by using any kneading method using an open roll, a kneader, etc. for each of the above components. As a test, the fluororubber composition was extruded and vulcanized at 180° C. for 8 minutes, and then maintained at 230° C...
Embodiment 2
[0078] In Example 1, the amount of silane coupling agent-treated wollastonite was changed to 40 parts by weight, and the amount of SRF carbon black for hardness adjustment (about 80) was changed to 15 parts by weight.
Embodiment 3
[0080] In Example 1, the amount of silane coupling agent-treated wollastonite was changed to 60 parts by weight, and the amount of SRF carbon black for hardness adjustment (about 80) was changed to 5 parts by weight.
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Abstract
A fluororubber composition whereby a vulcanizate having excellent blister resistance can be obtained, the fluororubber composition being obtained by blending 10-100 parts by weight of wollastonite surface-treated with a silane coupling agent and having an aspect ratio of 2 or greater and 0.5-10 parts by weight of a polyol-based cross-linking agent per 100 parts by weight of a fluororubber comprising 60-100 wt% of a solid fluororubber polymer and 40-0 wt% of a liquid fluororubber polymer. Preferably, from the perspective of both cost and ensuring blister resistance, 30-70 wt% of the wollastonite surface-treated with a silane coupling agent is substituted with wollastonite not surface-treated with a silane coupling agent.
Description
technical field [0001] The present invention relates to fluororubber compositions. More specifically, it relates to a fluororubber composition capable of providing a vulcanized compound having excellent blister resistance. Background technique [0002] Fluororubber compositions are excellent in heat resistance, oil resistance, etc., and are widely used as vulcanization molding materials for various sealing materials in a wide range of fields such as automobiles and various industrial machines. Especially for a sealing material used in a part under a high-temperature environment, a fluororubber composition is preferable as the sealing material. [0003] Here, in a high-temperature environment, if components of the material to be sealed volatilize, foaming (expansion, foaming) may occur in the sealing portion. If foaming occurs near the sealing (sliding) surface, it will become difficult to ensure stable sealing performance, and in the worst case, leakage will occur. Theref...
Claims
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Application Information
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