申请人:——
公开号:US20040133025A1
公开(公告)日:2004-07-08
Mercaptoalkylalkyldialkoxysilane compositions are prepared by reacting an alkoxysilane containing an unsaturated organic group, with a sulfur containing organic acid, in the presence of a peroxide catalyst. This step produces a thiol ester. In the next step, methanolysis of the thiol ester is carried out in the presence of a basic catalyst. The resulting product is a mercaptoalkylalkyldialkoxysilane composition such as mercaptoethylmethyldimethoxysilane, mercaptomethylmethyldiethoxysilane, mercaptopropylmethyldiethoxysilane, or mercaptopropylmethyldimethoxysilane. Carrying out the first step of the reaction at least in part in the presence of air obtains maximum efficiency.
Mercaptoalkylalkyldialkoxysilane组合物是通过在过氧化物催化剂存在下,将含有不饱和有机基团的烷氧基硅烷与含硫有机酸反应制备的。这一步骤产生硫醇酯。在下一步骤中,在碱性催化剂存在下进行硫醇酯的甲醇解反应。得到的产物是Mercaptoalkylalkyldialkoxysilane组合物,例如mercaptoethylmethyldimethoxysilane,mercaptomethylmethyldiethoxysilane,mercapto propylmethyldiethoxysilane或mercapto propylmethyldimethoxysilane。至少部分在空气存在下进行反应的第一步骤可以获得最大效率。