NKC-9催化D_4开环聚合制备高粘度二甲基硅油

Preparation of high viscosity dimethicone with NKC-9 catalyzed D_4 ring-opening polymerization

报道了采用高活性、低腐蚀性的强酸性阳离子交换树脂(NKC-9)催化八甲基环四硅氧烷(D_4)开环聚合,六甲基二硅氧烷(MM)封端,制备高粘度二甲基硅油的方法。探讨了聚合温度、聚合时间、催化剂量、封端剂用量等因素对聚合反应的影响。研究结果表明,当n(D_4)∶n(MM)=75、催化剂量为7%(质量分数)、聚合温度80℃、聚合时间3.5h时,获得的二甲基硅油产率为88.51%,粘度为23 520mPa·s。

Here a convenient method for preparation of high viscosity dimethicone with ring-opening polymerization of octmethylcyclotetrasiloxane（D4）and end-capped with hexamethyldisiloxane（MM）catalyzed with highly active and low corrosive strong acidic cation exchange resin（NKC-9）was explored.The influences of catalyst dosage,polymerization time,polymerization temperature and end-capped reagent on the polymerization were studied.The results exhibited that when n（D4）∶n（MM）=75,catalyst dosage was 7 wt% of the amount of D4,polymerization temperature was 80℃and its time was 3.5 h,the yield of the dimethicone obtained was 88.51%and the viscosity was 23 520 mPa·s.