二羟乙基己二酰胺油酸酯的制备与表征

Preparation and Characterization of Dihydroxyethyl Adipamide Oleate

用乙醇胺和己二酸二甲酯反应生成了中间体二羟乙基己二酰胺,当n(乙醇胺)∶n(己二酸二甲酯)=2时,收率95.2%。再将中间体与油酸进行酯化反应合成了具有润滑性能的二羟乙基己二酰胺油酸酯。合成的酯具有优良的热稳定性能、低挥发性、较低的毒性和良好的生物降解性,可成为环境友好型润滑剂。比较了酯化率和产品最终颜色,探讨了反应时间、反应温度对油酸酯化率的影响,优化了二羟乙基己二酰胺油酸酯合成条件:在吸水剂分子筛存在下,醇酸摩尔比为1∶2.2,反应时间为4 h,反应温度为125℃条件下,重复试验油酸的酯化率均在95%以上,产品的收率均在90%以上。

The dihroxyethyl adipamide intermediate was synthesized by reaction of ethanolamine with dimethyl adipate. The yield is 95.2% when the molar ratio of ethanolamine to dimethyl adipate is 2. The dihydroxyethyl adipamide oleate with lubricating performance was subsequently synthesized by the esterification reaction of the intermediate and oleic acid. The synthesized esters possess excellent thermal stability, low volatility and toxicity, as well as good bio-degradability, so that they can be used as the eco-friendly lubricants. The esterification rate and the terminal color of the products were compared. The influence of reaction time, reaction temperature on the esterification rate of oleic acid was discussed. The synthesis conditions of dihydroxyethyl adipamide oleate were optimized as follows： in the presence of hygroscopic agent molecular sieve, the molar ratio of alcohol to acid is 1 ： 2.2, the reaction time is 4h, the reaction temperature is 125 ℃. The esterification rates of oleic acid in the repetitive experiments are more than 95%, the yields of products are more than 90%.