双十二烷基对苯二甲酰胺丙酸钠的合成与性能研究

Synthesis and Properties of Sodium Dilauroylterephthalamide Propionate Acid

摘要:

以十二胺、丙烯酸甲酯、对苯二甲酰氯等为主要原料经加成、酰胺化、皂化等反应合成了一种酰胺型羧酸盐Gemini表面活剂N，N＇-双十二烷基对苯二甲酰胺丙酸钠(SDPA-12)。经单因素考查酰胺化反应的最佳工艺条件为：n (N-十二烷基-β-氨基丙酸甲酯)：n (对苯二甲酰氯) = 2.2：1，35 ℃回流反应8 h，收率68.7 %；经红外光谱，元素分析仪和核磁共振谱对产物结构进行了确认。性能测定表明：25 ℃时SDPA-12的表面张力为27.09 mN/m，临界胶束浓度为1.83?0-5 mol/L。

Abstract:

With dodecylamine，methyl acrylate and terephthaloyl chloride as raw material, Sodium N,N′-dilauroylterephthaloylamide propionate acid (SDPA-12) is synthesized by addition, amidation reaction and saponification. The influences of the reaction temperature, the reaction time and the ratios of reactants on the conversion in the amide reaction were investigated. The optimum reaction conditions were: n ( N-dodecyl-β-amino propionate acid methyl ester )：n (terephthaloyl chloride) = 2.2：1, reaction temperature is 35 ℃ and reaction time is 8 h, under these conditions, the conversion of terephthaloyl chloride is 68.7%. The SDPA-12’s structure were proved by Elemental analyzer, IR and NMR, (The SDPA-12’s structure were proved by confirming DPA-12’s structure, DPA-12: N,N′-dilauroylterephthaloylamide propionate acid). Experimental results show that SDPA-12 had a good surface activity, which the surface tension is 27.09 mN/m, and the critical micelle concentration is 1.83?0-5mol/L.