脂肪醇聚醚类乳化剂对低粘乳液制备的影响

Effects of fatty alcohol polyether emulsifiers on the preparation of low-viscosity emulsions

研究乳化剂对低粘乳液制备的影响,从而筛选出适合制备低粘乳液的乳化剂,并通过流变性能对其稳定性进行了初步考察。实验结果表明:鲸蜡硬脂醇聚醚类乳化剂比较适合制备低粘乳液;对于水包油类型乳化剂,相同的亲脂性基团下,亲水基越短屈服应力越高,同时离心稳定性越好。鲸蜡硬脂醇聚醚类乳化剂在配方中单用时存在一个较佳用量,在该用量下与低HLB值非离子乳化剂复配使用后乳液屈服应力明显提高,同时粒径更小。因为配方体系只有乳化剂变化,屈服应力提高很有可能是因为复配乳化剂导致更高的界面膜强度所致。

The effects of emulsifiers on the preparation of low-viscosity emulsions were studied.The long-term thermal stability of low-viscosity emulsions was monitored by investigating their rheological properties.The results show that cetearyl alcohol polyether emulsifier is suitable for preparing low-viscosity emulsions.For oil-in-water emulsifiers,given the same lipophilic group,the shorter the EO chain length,the better the yield stress and the centrifugal stability of the resulting emulsion.There is an optimal amount for cetearyl alcohol polyether emulsifier when it is solely used as the emulsifier.Its emulsifying property is good.The yield stress of the low-viscosity emulsion is significantly higher when cetearyl alcohol polyether emulsifier is combined with a low-HLB nonionic emulsifier,and the resulting particle size is smaller.It is highly likely due to the stronger interfacial film strength in the presence of two emulsifiers,because the emulsifier is the only variable in the studied emulsions.