Abstract: An amphoteric surfactant,3-bis(octylamidoethyl)amino-2-hydroxypropane sulfonate(BHS),was synthesized using octanoic acid,diethylenetriamine,epichlorohydrin and sodium bisulfite as starting materials. The structure of this surfactant was confirmed by FTIR,ESI-MS and ¹H NMR. The critical micelle concentration(cmc)was 0.52×10^-4mol/L and the lowest surface tension(γ_cmc)was 24mN/m at 25℃。 With the addition of NaCl solution (0.1mol/L),the cmc and γ_cmc decreased to 0.47×10^-4mol/L and 23.7mN/m,respectively. With an increase in temperature,the cmc increased,while the γ_cmc decreased. The performance of BHS showed that this surfactant exhibited better foam stability,wetting and emulsifying abilities than another typical surfactant bis(octylamidoethyl)amino propane sulfonate.

Key words: amphoteric surfactant, amino acid, interface tension, critical micelle concentration

摘要： 以正辛酸、二乙烯三胺、环氧氯丙烷和亚硫酸钠为主要原料合成了一种氨基磺酸盐型两性表面活性剂3-双(辛酰胺乙基)氨基-2-羟基-1-丙基磺酸钠(BHS),用红外光谱、质谱和核磁共振谱图确证了产物的结构。该表面活性剂水溶液性能测试结果表明:25℃时临界胶束浓度(cmc)为5.2×10^-4mol/L,最低水/空气界面张力(γ_cmc)低至24mN/m.加入0.1mol/L NaCl后,cmc减小至4.7×10^-4mol/L,γ_cmc降低至23.7mN/m.升高温度,cmc增加,γ_cmc下降。BHS的润湿性、乳化性能优于双辛酰胺乙基丙烷磺酸钠表面活性剂。

关键词: 两性表面活性剂, 氨基磺酸, 界面张力, 临界胶束浓度