菜籽油酸制备C21二元酸及其衍生物性能的研究

摘要

以菜籽油酸为原料,通过Diels Alder反应得到C21二元酸,经提纯、中和制备C21二元酸钠表面活性剂.采用质谱对C21二元酸进行分析,并对C21二元酸钠的表面性能进行研究.结果表明:以产物中亚油酸含量为指标,得到最佳反应条件为亚油酸与碘质量比1:0.002、亚油酸与丙烯酸摩尔比1:1.2、反应温度240℃,在此条件下产物中亚油酸含量低于1%;C21二元酸钠表面活性剂的临界胶束浓度为5.75 ×10 -3mol/L,表面张力可达37.98 mN/m,与月桂酸钠性能相当.%With rapeseed oleic acid as raw material,the C21dicarboxylic acid was obtained by Diels Alder addition reaction,and C21dicarboxylic acid sodium surfactant was synthesized by purification and neutral-ization.The C21dicarboxylic acid was analyzed by mass spectrum,and the surface properties of C21dicar-boxylic acid sodium were studied.The results showed that with the content of linoleic acid in the product as index,the optimal reaction conditions were obtained as follows:mass ratio of linoleic acid to iodine 1:0.002,molar ratio of linoleic acid to acrylic acid 1:1.2 and reaction temperature 240℃.Under these conditions,the content of linoleic acid in the product was less than 1%.The critical micelle concentration (CMC)of the C21dicarboxylic acid sodium surfactant was 5.75 ×1 0 -3mol/L and the surface tension (γ)reached 37.98 mN/m,which was comparable to the performance of sodium laurate.