支链型硅烷、聚醚烷基共改性硅油乳化剂的制备及性能研究

Synthesis and properties of the modified silicone emulsifier with branched-silicone-polyether and alkyl group

以乙烯基三乙氧基硅烷和三甲基乙氧基硅烷为原料水解缩合得到了乙烯基三(三甲基硅氧烷基)硅烷(即支链型硅烷)。以含氢硅油、支链型硅烷、烯丙基聚醚及1-十二烯为原料,氯铂酸为催化剂,异丙醇为溶剂,合成了共改性硅油乳化剂,并对产物结构进行了红外和核磁表征。研究了温度、时间、催化剂用量、物料比等因素对共改性硅油乳化剂转化率的影响及其结构对油包水乳液稳定性的影响。结果表明,95℃下反应5h,催化剂用量0.20%,物料比n(Si-H)∶n(混合物组成的C=C)=1∶1.1时合成的有机硅乳化剂,转化率高达94.97%;当乳化剂HLB=5,疏水基接枝比为n(支链型硅烷)∶n(烷基)=25∶75时,可以制备硅油、酯油和烃油为混合油相的稳定油包水乳液。

The vinyltris(trimethylsiloxy)silane(branched-silicone)was synthesized by the hydrolytic condensation of triethoxyvinylsilane and ethoxytrimethylsilane.The modified silicone emulsifier was synthesized through hydrosilylation reactions,using hexachloroplatinic acid as catalyst,isopropanol as solvent,and polymethylhydrosiloxane,vinyltris(trimethylsiloxy)silane,allyl polyther and 1-dodecene as raw materials.The structure of the modified silicone was characterized by 1H NMR and FT-IR.The effects of reaction temperature (T),time(t),catalyst dosage and material ratio on the conversion were investigated.The effects of the structure of modified silicone emulsifier on the stability of water-in-oil emulsion was also studied.The results show that the conversion is 94.97% when T=95 ℃,t=5 h,the catalyst dosage of 0.20% and n(Si-H)∶ n(C=C content of the mixture)=1∶1.1.When the HLB value of the emulsifier is equal to 5 and n(branchedsilicone)∶ n(alkyl)=25∶75,stable water-in-oil emulsion can be prepared by using the mixed oil phase composed of silicone oil,ester oil and hydrocarbon oil.