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以氰胺和十二烷基伯胺为原料,一步合成了十二烷基胍盐酸盐表面活性剂,经单因素实验确定了较佳工艺条件为:体积分数95%乙醇为溶剂,n(十二胺):n(氰胺):n(盐酸)=1:1.5:1.1,反应时间2 h。产品通过IR、1HNMR和元素分析进行了结构表征,并对其表面活性、泡沫性、乳化性和抑菌性进行了测试。结果表明,十二烷基胍盐酸盐的CMC为5.5 mmol/L,最低表面张力为24.1 mN/m,与DTAC相比,具有较好的泡沫性能,较差的乳化能力,较强的抑菌活性,在25 mg/L质量浓度下对金黄色葡萄球菌和大肠埃希氏菌的抑菌率达100%,在100 mg/L质量浓度下对白色念珠菌的抑菌率达99.5%。
Using dicyclohexyl amine and dodecyl primary amine as raw materials, dodecylguanidine hydrochloride surfactant was synthesized in one step. The optimum technological conditions were determined by single factor experiments: 95% ethanol as solvent, n Dodecylamine): n (cyanamide): n (hydrochloric acid) = 1: 1.5: 1.1, the reaction time 2 h. The product was characterized by IR, 1HNMR and elemental analysis, and its surface activity, foaming, emulsifying and bacteriostasis were tested. The results showed that CMC of dodecylguanidine hydrochloride was 5.5 mmol / L and the lowest surface tension was 24.1 mN / m. Compared with DTAC, it had better foam properties, poorer emulsifying ability and stronger The antibacterial activity against Staphylococcus aureus and Escherichia coli was 100% at a concentration of 25 mg / L. The antibacterial activity against Candida albicans at a concentration of 100 mg / L was 99.5%.