Multi-Component Room-Temperature-Curable Silicone Elastomer Composition

摘要

A multi-component room-temperature-curable silicone elastomer composition comprises (A) a diorganopolysiloxane including (A-1) a diorganopolysiloxane capped at both molecular terminals with alkoxysilyl groups or hydroxysilyl groups and (A-2) a diorganopolysiloxane capped at only one molecular terminal by an alkoxysilyl group or a hydroxysilyl group and at the other molecular terminal with an alkyl group or an alkenyl group, having a viscosity at 25° C. of 20 to 1,000,000 mPa·s. The composition further comprises (B) a silicon-bonded aryl group-containing alkoxysilane, (C) an organic compound having at least two alkoxysilyl groups in one molecule (and being free of siloxane bonds), and (D) a curing catalyst. Components (A), (B), (C), and (D) are not contained simultaneously in the composition. The composition generally shows sufficient usable life at low temperatures, curing properties with low dependence on temperature and excellent curability at low temperatures, and excellent adhesion.

主权项

1. A multi-component room-temperature-curable silicone elastomer composition comprising:
(A) 100 parts by weight of a diorganopolysiloxane capped at the molecular terminals by alkoxysilyl groups or hydroxysilyl groups, having a viscosity at 25° C. of 20 to 1,000,000 mPa·s; (B) from 0.1 to 20 parts by weight of a silicon-bonded aryl group-containing alkoxysilane; (C) from 0.1 to 10 parts by weight of an organic compound having at least two alkoxysilyl groups in one molecule, and being free of siloxane bonds, with a weight ratio of component (B) to component (C) being from 95:5 to 30:70; and (D) from 0.001 to 0.2 parts by weight of a curing catalyst;
wherein the multi-component room-temperature-curable silicone elastomer composition is a two-component room-temperature-curable silicone elastomer composition comprising:(I) a composition including component (A), but not component (B), (C), or (D); and(II) a composition including component (B), (C), and (D), but not component (A).