An object of the present invention is to provide an addition-curable silicone composition which provides silicone rubber which has excellent flame retardancy and is excellent in storage stability so that thickening due to dehydrogenation does not occur over time. The present invention provides an addition-curable silicone composition comprising the following components (A) to (E):
(A) 100 parts by mass of an organopolysiloxane having two or more alkenyl groups each bonded to a silicon atom and being liquid at 25 degrees C,
(B) an organohydrogenpolysiloxane having two or more hydrogen atoms each bonded to a silicon atom in an amount such that the number of the hydrogen atoms each bonded to a silicon atom in component (B) is 1 to 10 per the alkenyl group bonded to a silicon atom in component (A),
(C) a platinum group metal catalyst in a catalytic amount,
(D) 10 to 100 parts by mass of talc fine powder, and
(E) 1,2,3-benzotriazole, or a derivative thereof, in an amount of 2 to 500 moles per mole of the platinum group metal atom of component (C).
本发明的目的是提供一种加成固化
硅酮组合物,该组合物提供的
硅橡胶具有优异的阻燃性和出色的贮存稳定性,不会随着时间的推移因脱氢而变稠。本发明提供一种加成固化型有机
硅组合物,由以下组分(A)至(E)组成:
(A) 100 重量份的有机聚
硅氧烷,该有机聚
硅氧烷具有两个或两个以上的烯基,每个 烯基与一个
硅原子键合,在 25 摄氏度时呈液态、
(B) 有机氢聚
硅氧烷,该有机氢聚
硅氧烷具有两个或两个以上氢原子,每个氢原子均键 合到一个
硅原子上,其用量为:组分(B)中每个键合到
硅原子上的氢原子数与组分 (A)中键合到
硅原子上的烯基的比例为 1-10
(C) 催化量的
铂族
金属催化剂、
(D) 10 至 100 质量份的
滑石粉,以及
(E) 1,2,3-苯并三唑或其衍
生物,其用量为每摩尔组分(C)的
铂族
金属原子 2 至 500 摩尔。