不对称型磺基琥珀酸双酯盐双子表面活性剂的合成与性能

摘要

Lauryl alcohol,maleic anhydride and lauric acid monoethanolamide were used as starting materials to synthesized asymmetric Gemini sulfosuccinate surfactant. The optimized conditions for diesterification are as following:reaction temperature,140 ℃;reaction time,6 h;and n (lauryl alcohol maleic acid monoester)∶n(lauric acid monoethanolamide)= 1∶ 1. The structure of the target compound was characterized by FTIR and 1 HNMR. The surface tension,foaming performance and emulsifying power of the product were measured. Results showed that the product has low cmc as 2. 21 × 10 - 5 mol/ L and γcmc as 31. 1 mN/ m. It displays stronger foaming power and better foam stability. Water separation time of the emulsion made of the product achieves 278 s.%以十二醇、顺丁烯二酸酐及月桂酸单乙醇酰胺为原料，合成了一种不对称型磺基琥珀酸双酯盐双子表面活性剂。通过单因素试验法优化了双酯化反应条件，其较佳反应条件为：n（十二醇马来酸单酯）∶ n（月桂酸单乙醇酰胺）＝1∶1，反应温度为140℃，反应时间为6 h。通过傅里叶红外光谱、核磁共振对所得表面活性剂的结构进行了表征，并对其表面张力、泡沫性能、乳化力等进行了测定。结果表明：该双子表面活性剂的临界胶束浓度（cmc）为2.21×10－5 mol／ L，γcmc为31.1 mN／ m；乳化分水时间为278 s，起泡性和稳泡性良好。