Synthesis of a novel betaine-type asphalt emulsifier and its investigation by online FTIR spectrophotometry
作者:Chunlei Huai、Laishun Shi、Na Li
DOI:10.1007/s11164-012-0582-1
日期:2013.2
emulsifier, 3-(dodecyloxy)-2-hydroxypropan-N-carboxymethyl-N,N-dimethylammonium chloride, has been synthesized in a three-step reaction from lauryl alcohol, epichlorohydrin, dimethylamine, and chloroacetic acid. The optimum reaction conditions were obtained for synthesis of 2-(dodecyloxymethyl)oxirane in the first step. The yield reaches 75.7 % under the optimum conditions of reaction temperature 50 °C
新型甜菜碱型沥青乳化剂3-(十二烷氧基)-2-羟基丙烷-N-羧甲基-N,N由二月桂醇,表氯醇,二甲胺和氯乙酸经三步反应合成了氯化二甲基铵。在第一步中获得了合成2-(十二烷氧基甲基)环氧乙烷的最佳反应条件。在反应温度50℃,反应时间5h,表氯醇与月桂醇的原料摩尔比为1.4,碱度为33.3%的最佳条件下,收率达到75.7%。FTIR鉴定了这三种产品的结构。通过在线FTIR监测第一步中2-(十二烷氧基甲基)环氧乙烷的合成,并检测到中间体。在实验数据的基础上,提出了合理的反应机理。最终产物的临界胶束浓度(CMC)低,为8.8×10 -5 摩尔/升。CMC处的表面张力为21.2 mN / m。该产品是沥青的优良乳化剂。所制备的沥青乳液具有高的储存稳定性。乳化剂是快速凝固的沥青乳化剂。