Addition curable liquid silicone rubber composition for flame retardant airbag
An addition curable liquid silicone rubber composition for airbag includes an organopolysiloxane which is liquid at 25° C. and contains two or more alkenyl groups bonded to silicon atoms within one molecule, an organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms within one molecule, a silica fine powder having a BET specific surface area of 50 m 2 /g or more, a catalyst for hydrosilylation reaction, an organosilicon compound containing an adhesion-imparting functional group, an organopolysiloxane resin having a three-dimensional network structure, and iron(III) oxide monohydrate, α-iron(II) oxide, or both of them having a pH of 5 to 9.
1 . An addition curable liquid silicone rubber composition for airbag comprising:
(A) 100 parts by mass of an organopolysiloxane which is liquid at 25° C. and contains two or more alkenyl groups bonded to silicon atoms within one molecule,
(B) an organohydrogenpolysiloxane containing two or more hydrogen atoms bonded to silicon atoms within one molecule in such an amount that a hydrosilyl group contained in a composition is 1 to 10 moles per 1 mole of the total alkenyl groups bonded to silicon atoms contained in the composition,
(C) 1 to 50 parts by mass of a silica fine powder having a BET specific surface area of 50 m 2 /g or more,
(D) a catalytic amount of a catalyst for hydrosilylation reaction,
(E) 0.1 to 10 parts by mass of an organosilicon compound containing an adhesion-imparting functional group,
(F) 0.1 to 100 parts by mass of an organopolysiloxane resin having a three-dimensional network structure, and
(G) 1.2 to 6.0 parts by mass of iron (III) oxide monohydrate or a combination of iron (III) oxide monohydrate and α-iron (III) oxide, having a pH of 5 to 9,
wherein the adhesion-imparting functional group of the component (E) is one or more groups selected from the group consisting of an epoxy group, an alkoxy group bonded to a silicon atom, an alkenyl group, a hydrosilyl group, an isocyanate group, a (meth)acryl group, and a (meth)acryloxy group.
2 . The addition curable liquid silicone rubber composition for airbag according to claim 1 , further comprising, as a component (H), 0.1 to 5 parts by mass of at least one condensation cocatalyst selected from an organotitanium compound, an organozirconium compound, and an organoaluminum compound relative to 100 parts by mass of the component (A).
3 . An airbag comprising a cured film of the addition curable liquid silicone rubber composition for airbag according to claim 1 , on a base cloth for airbag.
4 . An airbag comprising a cured film of the addition curable liquid silicone rubber composition for airbag according to claim 2 , on a base cloth for airbag.