新型有机硅消泡剂的研制

Preparation of New Organic Silicon Defoamer

以二甲基硅油和超细硅酸铝组成的硅膏为主体,Span-Tween为复合乳化剂,采用普通搅拌的方式对硅膏在水相中进行乳化,制备有机硅乳液型消泡剂.考察了各组分含量对消泡剂性能的影响,得到最佳制备工艺:以硅油∶超细硅酸铝为15∶1的比例在130℃处理4 h得到硅膏,乳液中硅膏的质量分数为14%,复合乳化剂的HLB为9,质量分数为5%.实验结果表明,所制得消泡剂消泡性能、稳定性和水分散性均较好.

Emulsion organic silicon defoamer was prepared with a paste composed of dimethyl silicone and a luminum silicate mass fraction as the main material, Span Tween blend as emulsifying agent. The emulsifica tion process was carried out under water phase condition in a conventional mixing device. The effects of mass fraction of the components on the defoamer performance was investigated. The optimization of the formulation shows as following： silicone paste was prepared by reacting dimethyl silicone with aluminum silicate mass fraction （their mass ratio is 15：1 ） at 130 ℃ for 4 h, the mass fraction of silicone paste was 14% in the emulsion, Span Tween blend emulsifier was 5% with HLB value of 9. The experimental results show that the defoaming prop erties, stability and dispersibility in the water of the defoamer are good.