长链烷基硅油的制备

Synthesis of alkyl siloxane

文中以α 烯烃化合物和含氢硅油为原料在铂催化剂的作用下 ,用硅氢化反应合成长链烷基硅油。考查了各种反应条件的影响 ,确定最佳反应条件 :反应原料α 烯烃化合物与低含氢硅油的质量比为 35∶5 2 5 ;反应温度1 35℃ ;反应时间 1 3h ;催化剂用量为反应原料总质量的 0 0 0 35 % ;滴加含氢硅油所用时间 4 5min。对产品结构进行了核磁和折射率的测定 。

Alkyl siloxane was prepared by hydrosilation of poly(melthylhydrosiloxane) and α olefin, in the presence of platinum catalyst. The effects of various reaction conditions were investigated and the optimum reaction conditions were showed as follows: the proportion of the raw material was m (melthylhydrosiloxane): m(α olefin) =35∶52 5; the reaction temperature was 135?℃; the reaction time was 13 hours; content of the catalyst used was based on the raw material weight of 0 003?5% and poly(melthylhydrosiloxane) was added dripwise over a period of 45 min. The structure of the product was determined by NMR and refractive index,and its reaction mechanism was studied prelimarily.