以非离子型乳化剂为原料制备油包水型有机硅乳液

为获得稳定的有机硅乳液,分别采用几种不同亲水亲油平衡值的非离子型乳化剂(Gransurf 71,77,90,Span 60,Tween85)制备了有机硅乳液。考察了乳化剂Gransurf 77(R77)浓度、乳化剂并用、油水质量比、环境温度对有机硅乳液类型、液滴尺寸、黏度及稳定性的影响。采用乳化剂R77与R71复配获得了液滴尺寸小、稳定性较好的乳液。研究表明,随着乳化剂浓度的增加,液滴尺寸减小,乳液的稳定性提高;与含水量50%的乳液相比,高含水量乳液的液滴尺寸较小,黏度增加;乳液在室温下稳定,70℃时稳定性降低。

WATER-INOIL POLYSILOXANE EMULSION PREPARED BY NONIONIC EMULSIFIER

In order to obtain the stable polysiloxane emulsion,some nonionic emulsifiers(Gransurf 71,77,90,Span60 and Tween85) with different HLB value and their composite were used to prepare the polysiloxane emulsion respectively.The influences of the emulsifier Gransurf 77 concentration and composite,Roi(the volume ratio of oil/water solution) and the temperature on the stability of the prepared water-in-oil emulsions were studied by measuring its droplet size,viscosity and de-emulsifying ratio.The water-in-oil emulsion with small droplet size and good stability were obtained when Gransurf 77 and its composite were used as emulsifiers.The results show that the prepared emulsion has the following properties: with the increases of the Gransurf 77 concentration,the droplet size decreases,the emulsion viscosity and stability increase.Compared with the emulsion of 50% water content,the viscosity of high water content emulsion increases and its droplet size decreases.The emulsion keeps steady at room temperature,but its stability decreases when the temperature is above 70 ℃.