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    • 3. 发明授权
    • Process for preparing colloidal suspensions of organopolysiloxanes
    • 制备有机聚硅氧烷的胶体悬浮液的方法
    • US4857582A
    • 1989-08-15
    • US195567
    • 1988-05-18
    • Matthias WolfgruberBernward DeubzerVolker Frey
    • Matthias WolfgruberBernward DeubzerVolker Frey
    • C08L83/04C08G77/06C08J3/03
    • C08J3/03C08G77/06C08J2383/04
    • Colloidal suspensions of organopolysiloxanes are prepared by mixing an organosilicon compound selected from the group consisting of mixtures of alkoxysilanes and/or partial hydrolysates thereof and an organo(poly)siloxane which is optionally free of alkoxy groups and contains a maximum of 8 siloxane units, which is mixed with at least one alkoxysilane and/or a partial hydrolysate thereof, with water in the presence of an emulsifier, at a maximum rate of 5 moles of organosilicon compound per hour per liter of water, in which the organosilicon compound and the water is fed continuously, but separately from one another, into a reactor, in which at least one of the two substances contains an emulsifier, while the alkanol is being continuously removed by distillation from the aqueous suspension continuously emerging from the reactor. The aqueous suspension from which the alkanol has been removed by distillation is, if desired, recycled back into the reactor. A tubular reactor is preferably employed in which the water is added continuously at, or near the upper end of the tubular reactor and the organosilicon compound is added via several inlet points arranged along the longitudinal axis of the tubular reactor.
    • 有机聚硅氧烷的胶态悬浮液是通过混合选自烷氧基硅烷和/或其部分水解产物的混合物的有机硅化合物和任选不含烷氧基并且含有最多8个硅氧烷单元的有机(多)硅氧烷制备的, 与至少一种烷氧基硅烷和/或其部分水解产物在乳化剂存在下与水混合,其最大速率为每小时每升水5摩尔有机硅化合物,其中有机硅化合物和水为 连续地但彼此分开地进入反应器,其中两种物质中的至少一种含有乳化剂,同时通过蒸馏从连续从反应器中出来的水性悬浮液连续除去链烷醇。 通过蒸馏除去链烷醇的水性悬浮液如果需要,则循环回到反应器中。 优选使用管式反应器,其中水在管式反应器的上端处或附近连续加入,并且有机硅化合物通过沿着管式反应器的纵向轴线布置的几个入口点加入。