Separator and separator seal for polymer electrolyte fuel cells
AssigneesHonda Motor Co., Ltd., Shin-Etsu Chemical Co., Ltd.
InventorsDaisuke Okonogi, Satoru Terada, Noriyuki Meguriya, Osamu Hayashida
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Abstract
Disclosed is a rubber composition for separator seal, comprising (A) a mixture of two or more alkenyl-containing liquid organopolysiloxanes having different weight average molecular weights, (B) an organohydrogenpolysiloxane, (C) fumed silica having a BET specific surface area of 50-400 m2/g, (D) carbon black having a BET specific surface area of 30 to 120 m2/g, an iodine adsorption value of 30 to 120 mg/g, and a DBP absorption value of 100 to 200 ml/100 g, and (E) an addition reaction catalyst cures into a product which is useful as a separator seal in PEFCs.
Claims15
A separator seal for use in polymer electrolyte fuel cells which is formed of a sealing composition in the cured state, said sealing composition comprising:
- (A) 100 parts by weight of a liquid organopolysiloxane containing at least two alkenyl groups each attached to a silicon atom in a molecule,
- (B) 0.5 to 20 parts by weight of an organohydrogenpolysiloxane containing at least three hydrogen atoms each attached to a silicon atom in a molecule,
- (C) 10 to 30 parts by weight of fumed silica having a BET specific surface area of 50 to 400 m2/g,
- (D) 0.1 to 3 parts by weight of carbon black having a BET specific surface area of 30 to 120 m2/g, an iodine adsorption value of 30 to 120 mg/g, and a DBP absorption value of 100 to 200 ml/100 g, and
- (E) a catalytic amount of an addition reaction catalyst,
- said alkenyl-containing liquid organopolysiloxane (A) being a mixture of at least two liquid organopolysiloxanes having different weight average molecular weights.
A separator seal for use in polymer electrolyte fuel cells which is formed of a sealing composition in the cured state, said sealing composition consisting of:
- (A) 100 parts by weight of a liquid organopolysiloxane containing at least two alkenyl groups each attached to a silicon atom in a molecule,
- (B) 0.5 to 20 parts by weight of an organohydrogenpolysiloxane containing at least three hydrogen atoms each attached to a silicon atom in a molecule,
- (C) 10 to 30 parts by weight of fumed silica having a BET specific surface area of 50 to 400 m2/g,
- (D) 0.1 to 3 parts by weight of carbon black having a BET specific surface area of 30 to 120 m2/g, an iodine adsorption value of 30 to 120 mg/g, and a DBP absorption value of 100 to 200 ml/100 g,
- (E) a catalytic amount of an addition reaction catalyst, and
- (F) at least one component selected from the group consisting of fillers, internal parting agents, tackifiers and thixotropic agents,
- said alkenyl-containing liquid organopolysiloxane (A) being a mixture of at least two liquid organopolysiloxanes having different weight average molecular weights.
A separator seal for use in polymer electrolyte fuel cells which is formed of a sealing composition in the cured state, said sealing composition consisting essentially of:
- (A) 100 parts by weight of a liquid organopolysiloxane containing at least two alkenyl groups each attached to a silicon atom in a molecule,
- (B) 0.5 to 20 parts by weight of an organohydrogenpolysiloxane containing at least three hydrogen atoms each attached to a silicon atom in a molecule,
- (C) 10 to 30 parts by weight of fumed silica having a BET specific surface area of 50 to 400 m2/g,
- (D) 0.1 to 3 parts by weight of carbon black having a BET specific surface area of 30 to 120 m2/g, an iodine adsorption value of 30 to 120 mg/g, and a DBP absorption value of 100 to 200 ml/100 g,
- (E) a catalytic amount of an addition reaction catalyst, and
- (F) at least one component selected from the group consisting of fillers, internal parting agents, tackifiers and thixotropic agents,
- said alkenyl-containing liquid organopolysiloxane (A) being a mixture of at least two liquid organopolysiloxanes having different weight average molecular weights.
Dependencies are inferred from the claim text.