Development And Preparation Of Organic Silicon Defoamer

Organic silicon defoamer can attract an alluring prospect of development and application in future for its numerous advantages, 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 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 organicsilicon defoamer, then the amount of SiO₂, and HLB is next, and the last is the amount of dimethyl silicone. The best stability of organosilicon deofamer is achieved when the value of HLB is 8.9 and the mass fraction of dimethyl-silicon oil,silicon dioxide and emulsifier are 20 %,3% and 6 % separately.