制备有机聚硅氧烷凝胶的方法
阅读说明:本技术 制备有机聚硅氧烷凝胶的方法 (Process for preparing organopolysiloxane gels ) 是由 F·桑德迈尔 C·朔塞尔 于 2017-06-12 设计创作,主要内容包括:本发明描述了一种制备有机聚硅氧烷凝胶的方法,其中使用(1a)由式SiO<Sub>2</Sub>(Q单元)和R<Sub>3</Sub>SiO<Sub>1/2</Sub>和R<Sub>2</Sub>R<Sup>1</Sup>SiO<Sub>1/2</Sub>(M单元)组成的不饱和有机聚硅氧烷树脂,其中,R和R<Sup>1</Sup>是具有权利要求1中所限定的定义,以及任选存在的(1b)具有极性有机基团和可氢化硅烷化端基的化合物,与(2)两种具有不同的平均链长和下式(R<Sup>2</Sup><Sub>3-x</Sub>H<Sub>x</Sub>SiO<Sub>1/2</Sub>)(R<Sup>2</Sup><Sub>2</Sub>SiO<Sub>2/2</Sub>)<Sub>a</Sub>(R<Sup>2</Sup>HSiO<Sub>2/2</Sub>)<Sub>b</Sub>(R<Sup>2</Sup><Sub>3-x</Sub>H<Sub>x</Sub>SiO<Sub>1/2</Sub>)(I)的含Si-H的有机聚硅氧烷的混合物在(3)促进Si-键合氢加成到脂族多键的催化剂的存在下进行反应,其中R<Sup>2</Sup>具有权利要求1中所限定的定义,x是0或1,a和b各自为≥0的整数,条件是总和a+b≥30,所述有机聚硅氧烷平均含有至少2个Si-键合的氢原子,优选至少3个Si-键合的氢原子,并且所述两种有机聚硅氧烷的长链的链长(a+b)是短链有机聚硅氧烷的链长(a+b)的至少3倍,其中(1a),任选存在的(1b)和(2)分散在(4)稀释剂中,并且该反应在加入(5)用作催化剂毒物的终止剂化合物而终止。(The invention relates to a method for producing organopolysiloxane gels, wherein (1a) is used 2 (Q unit) and R 3 SiO 1/2 And R 2 R 1 SiO 1/2 (M units) of an unsaturated organopolysiloxane resin of which R and R 1 Is a compound having the definition as defined in claim 1, and optionally present (1b) a compound having a polar organic group and a hydrosilylatable end group, and (2) two compounds having different average chain lengths and the formula (R) 2 3‑x H x SiO 1/2 )(R 2 2 SiO 2/2 ) a (R 2 HSiO 2/2 ) b (R 2 3‑x H x SiO 1/2 ) (ii) a mixture of Si-H containing organopolysiloxanes of formula (I) in which R is reacted in the presence of (3) a catalyst which promotes the addition of Si-bonded hydrogen to aliphatic multiple bonds 2 Having the definitions defined in claim 1X is 0 or 1, a and b are each integers > 0, with the proviso that the sum a + b > 30, the organopolysiloxanes containing on average at least 2 Si-bonded hydrogen atoms, preferably at least 3 Si-bonded hydrogen atoms, and the chain length of the long chains (a + b) of the two organopolysiloxanes being at least 3 times the chain length (a + b) of the short-chain organopolysiloxanes, wherein (1a), optionally (1b) and (2) are dispersed in (4) diluents and the reaction is terminated by addition of (5) terminator compounds which act as catalyst poisons.)
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