| 摘要 |
PURPOSE:A rapid-curing liquid silicone rubber composition free of catalyst poisoning, comprising specified two kinds of organopolysiloxanes and an epoxy curing catalyst. CONSTITUTION:A liquid silicone rubber composition comprising an organopolysiloxane of formula I containing at least two epoxy groups in the molecule (wherein R<1> is H, a 9C or lower organic group, or OH, R<2> is a group of formula II, III, IV, or V, a is a positive number <=4 and b is a positive number <=1), an organopolysiloxane of formula VI containing at least two amino groups in the molecule (wherein R<3> is H, a 9C or lower organic group, or OH, R<4> is a group of formula VII or VIII, c is a positive number <=4, and d is a positive number <=1), and an epoxy curing catalyst (e.g, tributylamine or phenylimidazole). This composition cures at room temperature or by heating. This composition is freed from drawbacks such as catalyst poisoning and inhibition by oxygen and, besides, it does not form by-products when cured, so that it can give moldings of high dimensional stability.
|
