N-月桂酰基乙二胺二乙酸钠的合成及性能研究

摘要

The intermediate N-lauryl acyl ethylenediamine (LED) was synthesized with ethylenediamine and lauric acid as raw materials, and further reaction with sodium chloroacetate, then the final product N-lauryl -ethylenediamine-diacetate (LEDC) was synthesized.The product structure was characterized by IR and 'HNMR spectroscopy. The surface properties of LEDC were measured. The results show that At 25℃, the critical micelle concentration (CMC) of LEDC is 1.9 mmol·L-1 and the surface tension at CMC (γCMC) is 25.0 mN·m-1. As the temperature increases, the CMC of LEDC first decreases and then increases, and the γCMC decreases. The foam property of LEDC is between LAS and OP-10, and emulsifying ability is the highest among of them, and the stability in hard water is better than LAS.%以月桂酸和乙二胺为原料,合成了中间体N-月桂酰基乙二胺(LED),进一步与氯乙酸钠反应,得到目标产物N-月桂酰基乙二胺二乙酸钠(LEDC).通过IR和1HNMR对产物进行结构表征.测定了LEDC在水溶液中的表面活性,其临界胶束浓度(CMC)约为2.0mmol·L-1,临界胶束浓度时的表面张力(γCMC)为25mN·m-1；随着温度变化,其CMC及γCMC变化不大.LEDC的泡沫性能介于LAS和OP-10之间,乳化能力强于两者,在硬水中的稳定性优于LAS.