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中文摘要: 以5种化妆品常用的聚丙烯酸类增稠剂作为研究对象，通过测试流变学参数黏度对其增稠性及耐离子性进行分析。考察了5种增稠剂水溶液在不同质量分数和pH下的黏度变化，结果表明，共聚物Carbomer 940的增稠效果最好，但黏度在pH=2~11时变化较大；含金属离子共聚物AVS、EMT-10和HMB增稠效果一般，黏度在pH=5~11时保持稳定；自聚物Zen增稠效果最差，但黏度在pH=2~8时保持稳定。在增稠剂水溶液中加入NaCl和MgCl2，考察化妆品中常见离子对增稠剂水溶液稳定性的影响，结果显示，盐的加入均破坏了5种增稠剂水溶液的稳定性，其中自聚物Zen的耐离子性最好；对增稠性和耐离子性最好的2种增稠剂复配体系进行分析，发现Carbomer 940和Zen的复配体系在增稠性方面起到协同增效的作用，两者复配使用能得到增稠性和耐离子性都较好的增稠剂体系。
Abstract:The thickening and ion resisting effect of five kinds of polyacrylic acid type common thickeners were tested. Viscosity of their aqueous solutions at different mass fraction were measured, and the variations of viscosity with pH value were examined. Results show that co-polymer Carbomer 940 displays the best thickening performance, but its viscosity varies with pH value 2-11. The thickening effect of co-polymers that contain metal ions AVS, EMT-10 and HMB displays a general state, and their viscosity is stable within pH value 5-11. The thickening effect of bulk-polymer Zen is the lowest, while its viscosity is stable within pH value 2-8. NaCl and MgCl2 were added separately to aqueous solution of the five kinds of thickener to examine the influence of common ions in cosmetics on their viscosity. Addition of the salts declines the stability of the aqueous solution of all the five kinds of thickener. However, bulk-polymer Zen displays the best ion resistance. Blends composed of Carbomer 940 and Zen were tested, and their thickening and ion resistance were measured. Result shows that there is synergic effect for thickening performance of the Carbomer 940-Zen system. Both thickening effect and ion resistance can be improved by blending of Carbomer 940 and Zen.
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|LIU Xiao-min||School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan, Guangdong 528458, China|