苯并咪唑季铵盐表面活性剂的合成及性能

Synthesis of a Surfactant of Benzimidazole Quaternary Ammonium Salt and Its Properties

以邻苯二胺和月桂酸为原料,合成了中间体2-十一烷基苯并咪唑,进一步与苄基氯反应合成了阳离子表面活性剂1,3-二苄基-2-十一烷基苯并咪唑季铵盐(UBS)。通过IR和1 H-NMR对中间体及目标产物进行了结构表征。研究了UBS在水溶液中的表面活性。35℃下,它的临界胶束浓度(CMC)为0.51mmol/L,临界胶束浓度时的表面张力(γCMC)为39.6mN/m;随着温度降低,其CMC略有减小,γCMC升高。比较了UBS与常见表面活性剂LAS和OP-10的泡沫性能,UBS的发泡能力强于LAS和OP-10,稳泡性较低。

The cationic surfactant 1,3-dibenzyl-2-undecyl benzimidazole quaternary ammonium salt（UBS） was prepared by the reaction of benzyl chloride with 2-undecyl benzimidazole（UB）,which was synthesized with o-phenylenediamine and lauric acid.The structures of UB and UBS were characterized by IR and 1H-NMR.The surface activities of UBS in aqueous solution were studied at different temperature.At 35 ℃,the critical micelle concentration（CMC） of UBS is 0.51 mmol/L and the surface tension at CMC（γCMC） is 39.6 mN/m.As the temperature decreases,the CMC of UBS lessens slightly and the γCMC increases.The foam properties of UBS aqueous solution were determined and compared with LAS and OP-10,the foaming power of UBS is the highest and its steady of foam is the lowest among of them.