高速剪切乳化法制备硅油乳液

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

以二甲基硅油(1 000 mPa·s)为主要原料,非离子型表面活性剂NP-4和吐温-80复配为乳化剂,天然高分子明胶为稳定剂,采用高速剪切乳化法制备了水包油型(O/W)硅油乳液。考察了乳化剂HLB值及用量、硅油含量、稳定剂用量、乳化温度、剪切速度、剪切时间等制备条件对硅油乳液性能的影响。确定了最佳工艺条件为:在乳液体系中w(硅油)=35%,w(乳化剂)=10.5%,w(稳定剂)=0.3%;乳化温度35℃,剪切速度11 000r/min,剪切时间10 min。在上述工艺条件下,所制得的硅油乳液外观呈白色、细腻、均一的液体,具有良好的分散性和稳定性,乳液平均粒径为1.2μm左右,乳液固体质量分数为46%左右。

The silicone oil/water emulsion was prepared by high-speed shear emulsification method with dimethicone（1000 mPa·s）as the main material, nonionic surfactant NP-4 and Tween-80 as emulsifier, gelatin as stabilizer. The preparation conditions effecting on performances of silicone oil emulsion were discussed, such as HLB value, the amount of emulsifier, the amount of silicone oil, the amount of stabilizer, emulsification temperature, shear speed,shear time, etc. 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 11000 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 1.2μm, and the solid content of emulsion was about 46%.