Preparation of Silicone Oil Emulsion by High-Speed Shear Emulsification Method

The silicone oil /water emulsion was prepared by high-speed shear emulsification method with dimethicone( 1 000 mPa · s) as the main material,nonionic surfactant NP- 4 and Tween- 80 as emulsifier,and gelatin as stabilizer. The preparation conditions affecting the performance of silicone oil emulsion were discussed,including HLB value,the amount of emulsifier,the amount of silicone oil,the amount of stabilizer,emulsification temperature,shear speed,and shear time. The optimal process conditions for preparing silicone oil emulsion were identified as follows: in the emulsion systems,w( silicone oil) = 35%,w( emulsifier) = 10.5% and w( stabilizer) = 0.3%; the emulsification temperature was 35 ℃,the shear speed was 11 000 r /min and the shear time was 10 min. Under these conditions,the obtained silicone oil emulsion was white,fine and homogeneous liquid,and had good dispersibility and stability. The average particle diameter was about 1. 2 μm,and the solid content of emulsion was about 46%.