| 摘要 |
1515651 Silicone rubber compositions curable by heat and moisture DOW CORNING CORP 10 Jan 1977 [15 Jan 1976] 0705/77 Heading C3T An anhydrous composition, heat-curable in the presence of moisture, comprises (A) 100 p.b.w. of a vinyl-terminated polydiorganosiloxane, free of SiOH and hydrolysable groups, of viscosity at least 1 Pa-sec. but less than 100 Pa-sec. at 25‹ C., having hydrocarbyl and/or fluorinated hydrocarbyl organic groups, at least 50% being methyl groups; (B) 3-10 p.b.w. of an alkenyl triacetoxysilane; (C) 0À1-10 p.b.w. of an organic peroxy compound; and (D) 10-300 p.b.w. of a filler. In the examples 100 p.b.w. of vinyl-terminated polydimethylsiloxane of 55,000 cP/25‹ C. is mixed mixed with 3 p.b.w. fume silica, 0À85 p.b.w. hydroxy - terminated methyl phenyl polysiloxane (500 cP/25‹ C.), 69 p.b.w. of 5 micron quartz, or 36 of this plug 33 p.b.w. of CaCO3, 3 p.b.w. Fe2O3 and 6 p.b.w. of a 1 : 1 mixture of 2 - 4-dichlorobenzoyl peroxide and a silicone oil; to this is added 4À15 or 5À45 p.b.w. ViSi(O.CO.CH3)3; the samples are cured in 50% relative humidity at 150‹ C. for 10 mins. and adhere well to Al, steel and glass. |
