增稠氨基酸表面活性剂的吡咯烷酮柠檬酸盐

Pyrrolidone citrate used for thickening of amino acid surfactants

摘要:

利用吡咯烷酮表面活性剂〔N-辛基-2-吡咯烷酮（C8P）和N-十二烷基-2-吡咯烷酮（C12P）〕与柠檬酸以非共价键形式构筑了一系列吡咯烷酮柠檬酸盐表面活性剂(HCA-nC8P，HCA-nC12P)，考察了表面化学性能的影响因素以及不同比例的柠檬酸对C8P或C12P溶解和润湿性能的影响。通过表面张力和电导率实验表明，形成了离子型表面活性剂，并且相较于HCA-nC8P，柠檬酸的引入更能影响HCA-nC12P的表面活性。随着C8P或C12P与柠檬酸物质的量比增大，CMC和Γmax逐渐减小，pC20和Amin逐渐增大。当C8P或C12P与柠檬酸物质的量比为1:1时，产物HCA-1C8P和HCA-1C12P的水溶性增强，随着柠檬酸摩尔分数的减小，润湿性越来越好。流变实验发现，吡咯烷酮柠檬酸盐能显著增加月桂酰肌氨酸钠表面活性剂水溶液的黏度，其中，HCA-2C12P的加入使得黏度增加到质量分数为15%的月桂酰肌氨酸钠的80倍。

Abstract:

New pyrrolidone citrate surfactants(HCA-nC8P, HCA-nC12P) were constructed via acid-alkali reactions of pyrrolidone surfactants (N-octyl-2-pyrrolidone, C8P and N-dodecyl-2- pyrrolidone, C12P) with citric acid. The related factors affecting surface-active properties and the effects of different proportions of citric acid on the solubility and wetting of C8P or C12P were studied. The experiments of surface tension and electrical conductivity show that the ionic surfactants are formed, and the addition of citric acid can affect the surface activity of HCA-nC12P more than that of HCA-nC8P. When the mole ratio of C8P or C12P and citric acid increases, CMC and Γmax gradually decrease, pC20 and Amin increase. When the mole ratio is 1:1, the water solubility of HCA-1C8P or HCA-1C12P increases, and the wettability gets better as the ratio increases. Through rheological experiments, pyrrolidone citrate surfactants can well increase the viscosity of sodium lauroyl sarcosine aqueous solution. The addition of HCA-nC8P can increase the viscosity of 15 wt% sodium lauryl sarcosine aqueous solution by 10~15 times, and with the increase of carbon chain length(HCA-nC12P), the viscosity can increase to 70~80 times.