会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明授权
    • Method for the preparation of an organopolysiloxane containing
tetrafunctional siloxane units
    • 制备含四官能硅氧烷单元的有机聚硅氧烷的方法
    • US5070175A
    • 1991-12-03
    • US706148
    • 1991-05-28
    • Hiroshi TsumuraKiyoyuki MutohKazushi SatohKen-ichi Isobe
    • Hiroshi TsumuraKiyoyuki MutohKazushi SatohKen-ichi Isobe
    • C08G77/02C08G77/06C08G77/08
    • C08G77/08C08G77/06
    • An efficient and economically advantageous method is proposed for the preparation of an organopolysiloxane comprising tetrafunctional siloxane units, i.e. Q units, and, typically, monofunctional siloxy units, i.e. M units, and useful as a reinforcing agent in silicone rubbers. The method comprises the steps of: mixing the reactants for providing the Q and M units, such as ethyl orthosilicate and trimethyl methoxy silane, in a desired molar ratio; and heating the mixture at a temperature higher by at least 10.degree. C. than the boiling point of the mixture under normal pressure in a closed vessel in the presence of water and a catalyst such as a sulfonic acid group-containing compound. In addition to the greatly shortened reaction time and remarkably decreased contents of residual alkoxy groups and gelled matter in the product, the method is advantageous also in respect of the absence of the problems caused by the disposal of the waste water as well as the corrosiveness of hydrogen chloride unavoidably produced in the conventional prior art methods.
    • 提出了一种有效和经济上有利的方法,用于制备包含四官能硅氧烷单元即Q单元的有机聚硅氧烷,通常为单官能甲硅烷氧基单元,即M单元,并且可用作硅橡胶中的增强剂。 该方法包括以下步骤:以所需的摩尔比混合反应物以提供Q和M单元,如原硅酸乙酯和三甲基甲氧基硅烷; 并且在水和催化剂如含磺酸基化合物的存在下,在密闭容器中,在常压下,比混合物的沸点高至少10℃的温度加热该混合物。 除了反应时间大大缩短,产物中残留的烷氧基和凝胶物含量显着降低之外,该方法在废水处理不存在的问题以及废水处理的腐蚀性方面也是有利的 在常规现有技术方法中不可避免地产生氯化氢。