表面活性剂克拉夫特点测定方法的探讨

Discussion on Measurement of Krafft Point of Surfactants

受非离子表面活性剂浊点测定方法的误导,一些教科书和实验讲义将离子型表面活性剂的克拉夫特点定义为1％质量分数的表面活性剂水溶液加热时溶液由浑浊变澄清时的温度.在此,结合阴离子表面活性剂十二烷基硫酸钠水溶液的相图详细分析了该定义的不合理之处,提出了快速、准确地测定离子型表面活性剂克拉夫特点的方法.

Misled by the definition of cloud point of nonionic surfactants, many textbooks and experimental handouts define the Krafft point of ionic surfactants as the temperature when the 1. 0wt% aqueous solution of ionic surfactants turn from turbid into transparent with tempera- ture increasing. Herein, the irrational point was pointed out through the analysis of solubility features of the typical anionic surfactants, sodium lauryl sulfate. Finally, a simple and fast strat- egy was proposed to measure the Krafft point of ionic surfactants accurately.