SILICONE RUBBER COMPOSITION, METHOD FOR PRODUCING THE SAME, HEAT-CURABLE SILICONE RUBBER COMPOSITION, AND RUBBER SEALING PART FOR AUTOMOBILES

摘要

A silicone rubber composition comprising (A-1) a diorganopolysiloxane having at least two silicon atom-bonded alkenyl groups per molecule in which at least 48 % by mole of silicon atom-bonded groups are fluorine atom-substituted alkyl groups, (A-2) a diorganopolysiloxane having at least two silicon atom-bonded alkenyl groups per molecule and having no silicon atom-bonded fluorine atom-substituted alkyl group with the proviso that the weight ratio of component (A-1) to component (A-2) is from 70:30 to 98:2, (B) a dry-process silica of which surface has been hydrophobically treated with a cyclic dimethylsiloxane oligomer, (C) a silanol group-containing organosiloxane oligomer or organosilane. A heat-curable silicone rubber composition comprising the silicone rubber composition and (D) a curing catalyst. A rubber sealing part for automobiles resulting from curing of the heat-curable silicone rubber composition.