有机硅消泡剂的制备研究

以二甲基硅油和二氧化硅组成的硅膏为主体成分,Span-Tween为复合乳化剂,采用普通搅拌装置对硅膏在水相中进行复合乳化,制备了有机硅消泡剂。通过L9正交实验优化了有机硅消泡剂的合成条件,得到了稳定性较高的消泡剂。复合乳化剂用量对反应的影响为主要影响因素,二氧化硅(S iO2)用量和亲油亲水平衡值(HLB值)的影响次之;二甲基硅油用量的影响较小。当二甲基硅油的质量分数为16.0%,二氧化硅的质量分数为2.0%,复合乳化剂的质量分数为6.0%,亲油亲水平衡值为9.6时,制备的有机硅消泡剂的稳定性最好。

Study of Preparation of the Organ Silicon Deformer

Organic silicon defoamer can attract an alluring prospect of development and application in future for its numerous advanta- ges, for example, few raw materials, well defoamation, good capability of inhibiting foamings, no poison and no pollution and so on. In this paper, organic silicon defoamer is prepared by using a paste composed of dimethyl silicone and silicon dioxide as the main material ; Span/Tween blent as emulsifying agent. The emulsification process is carried out under water phase condition in a usual stirring device. The condition of synthesizing organic silicon defoamer is optimized by using L9 orthogonal design methods and the defoamer with preferable stability is obtained finally. The results show that the amount of compounded emulsifier is the most dominant to affect the stability of organic silicon defoamer, then the amount of SiO2 and HLB is next, and the last is the amount of dimethyl silicone. The best stability of organosilicon defoamer is achieved when the value of HLB is 9.6 and the mass fraction of dimethyl-silicon oil ,silicon dioxide and emulsifier are 16.0% ,2.0% and 6.0% separately.