A novel betaine type asphalt emulsifier 3-(N,N,N-dimethyl acetoxy ammonium chloride)-2-hydroxypropyl laurate was synthesized after three steps by the reaction of lauric acid, epichlorohydrin, dimethylamine and sodium chloroacetate. The optimum reaction conditions were obtained for the synthesis of the first step of 3-chloro-2-hydroxypropyl laurate. The esterification yield reaches 97.1% at the optimum conditions of reaction temperature 80oC, reaction time 6 h, feedstock mole ratio of epichlorohydrin to lauric acid 1.5, mass ratio of catalyst to lauric acid 2%. The chemical structure of the product was characterized by FTIR and 1H NMR. The first synthesis step of 3-chloro-2-hydroxypropyl laurate was monitored by online FTIR technique. The by-product was detected by the online FTIR analysis. Based upon the experimental data, a plausible reaction mechanism was proposed for the reaction. The CMC of the objective product has a lower value of 7.4×10-4 mol/L. The surface tension at CMC is 30.85 mN/m. The emulsifier is a rapid-set asphalt emulsifier.

中文翻译：

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在线FTIR分光光度法研究合成新型甜菜碱型沥青乳化剂

通过月桂酸，表氯醇，二甲胺和氯乙酸钠的反应三步，合成了一种新型甜菜碱型沥青乳化剂3-（N，N，N-二甲基乙酰氧基氯化铵）-2-羟丙基月桂酸酯。获得了合成3-氯-2-羟丙基月桂酸酯第一步的最佳反应条件。在最佳反应温度80oC，反应时间6h，表氯醇与月桂酸的原料摩尔比为1.5，催化剂与月桂酸的质量比为2％的条件下，酯化反应的收率达到97.1％。产物的化学结构通过FTIR和1H NMR表征。通过在线FTIR技术监测月桂酸3-氯-2-羟丙基酯的第一步合成。通过在线FTIR分析检测到副产物。根据实验数据，提出了合理的反应机理。目标产品的CMC值较低，为7.4×10-4 mol / L。CMC处的表面张力为30.85 mN / m。乳化剂是快速凝固的沥青乳化剂。