苯并咪唑季铵盐表面活性剂的合成及性能

摘要

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.%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1H- 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0.51 mmol/L,临界胶束浓度时的表面张力(γCMC)为39.6 mN/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,UPS的发泡能力强于LAS和OP- 10,稳泡性较低.