两性离子_阴离子表面活性剂复配体系协同作用的(5)

表面活性剂

第3期 张雪勤等：两性离子/阴离子表面活性剂复配体系协同作用的研究 5 Study of Cooperative Effect of Mixed System of

Zwitterionic and Anionic Surfactants

Zhang Xueqin，Cai Yi，Yang Yajiang

(Department of Chemistry, Hua Zhong University of Science and Technology, Wuhan, 430074)

Abstract The formation ability of micelle, the ability of reducing surface tension and foaming performance has been investigated for the mixed system of zwitterionic and anionic surfactant (Lauramidopropyl Betaine / Sodium Dodecyl Sulphate). The optimal surface activity was found when the mass fraction of Lauramidopropyl Betaine was about 3～7. The influence of salts on surface properties and foaming properties for the mixed system has been also studied. It was found that the surface activity was enhanced and the ｃｍｃ values were reduced in this system. The foamability of this system will be reduced when salts were applied at higher concentration. For instance, surface tension of mixed system (0.0025%) was reduced 1.73 mN / m in the presence of 0.1 mol/L of NaCl. and foamability were increase 7.2% in the presence of 0.17 mol/L of NaCl. Exceptionally foaming properties become worse when the concentration of NaCl was higher than 0.26 mol/L.

Keywords SDS/LMB mixed system； Cooperative effect； Foaming properties

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