The manipulation of emulsion stability for kinetically sustainable cosmetic emulsions is an important technology in cosmetic industry, however the relationship between emulsifying process and long-term emulsion stability has not been elucidated. Herein, the effect of shear mixing process on the stability of oil-in-water cosmetic emulsions is investigated by varying the shear mixing rate, emulsification time, and water phase temperature. The analysis on droplet size distribution and shear viscosity revealed that the strong viscous forces at optimal shear mixing rate of 4000 rpm afforded the fine and uniform droplets for cosmetic emulsions, leading to the improvement of long-term emulsion stability. Moreover, since the prolonged shear mixing induced the destabilization of emulsion droplets through droplet coalescence, optimal shear mixing time of 3 min could improve the kinetic stability of cosmetic emulsions. The dependence of long-term emulsion stability on emulsification temperature was relatively low. The theoretical analysis using the Derjaguin-Landau-Verwey-Overbeek theory demonstrated that the shear mixing rate played a major role in sustaining fine and uniform cosmetic emulsions with long-term stability. The present study can greatly contribute to the fabrication of functional cosmetic emulsions with long-term stability by controlling the shear mixing parameters in simple emulsification process.

用于动力学上可持续的化妆品乳液的乳液稳定性的操纵是化妆品工业中的一项重要技术，但是尚未阐明乳化过程与长期乳液稳定性之间的关系。本文中，通过改变剪切混合速率，乳化时间和水相温度，研究了剪切混合工艺对水包油型化妆品乳液稳定性的影响。对液滴尺寸分布和剪切粘度的分析表明，在最佳剪切混合速率为4000 rpm时，强大的粘性力可为化妆品乳液提供细小且均匀的液滴，从而改善了长期乳液的稳定性。此外，由于长时间的剪切混合会通过液滴的聚结而引起乳液液滴的失稳，3分钟的最佳剪切混合时间可以提高化妆品乳液的动力学稳定性。长期乳液稳定性对乳化温度的依赖性相对较低。使用Derjaguin-Landau-Verwey-Overbeek理论进行的理论分析表明，剪切混合速率在维持具有长期稳定性的精细且均匀的化妆品乳液方面起着主要作用。通过控制简单的乳化过程中的剪切混合参数，本研究可以为具有长期稳定性的功能性化妆品乳液的制备做出巨大贡献。使用Derjaguin-Landau-Verwey-Overbeek理论进行的理论分析表明，剪切混合速率在维持具有长期稳定性的精细且均匀的化妆品乳液方面起着主要作用。通过控制简单的乳化过程中的剪切混合参数，本研究可以为具有长期稳定性的功能性化妆品乳液的制备做出巨大贡献。使用Derjaguin-Landau-Verwey-Overbeek理论进行的理论分析表明，剪切混合速率在维持具有长期稳定性的精细且均匀的化妆品乳液方面起着主要作用。通过控制简单的乳化过程中的剪切混合参数，本研究可以为具有长期稳定性的功能性化妆品乳液的制备做出巨大贡献。