聚硅氧烷与具有表面活性的聚醚反应,形成改性的含硅表面活性剂。可用于乳状液的破乳和原油脱水,称之为含硅破乳剂。聚硅氧烷与聚醚反应后的产物,其联结方式,可分为Si—O—C键键合的和Si—C键键合的两类聚硅氧烧—聚醚嵌段共聚物。合成这两类共聚物可用不同的工艺来实现。而合成Si—O—C键键合的嵌段共聚物,具有以下三种缩聚反应类型: The polysiloxane reacts with the surface-active polyether to form a modified silicon-containing surfactant. Can be used for emulsion demulsification and dehydration of crude oil, known as silicon-containing demulsifier. Polysiloxane and polyether products after the reaction, the connection can be divided into Si-O-C bond and Si-C bond two types of polysiloxane-polyether block copolymer. The synthesis of these two types of copolymers can be achieved with different processes. The synthesis of Si-O-C bond block copolymer, with the following three types of polycondensation reaction: