壬基酚聚氧乙烯醚型阳离子沥青乳化剂的合成及在线红外光谱研究

以壬基酚聚氧乙烯醚(NP-10)、三乙胺和环氧氯丙烷为原料,反应合成出新型N-(3-壬基酚聚氧乙烯醚(10)-2-羟基)丙基-N,N,N-三乙基氯化铵阳离子沥青乳化剂.确定最佳反应条件为:反应时间8 h,反应温度70℃,Na OH与NP-10的摩尔比1.0,环氧氯丙烷与NP-10的摩尔比1.2,三乙胺与NP-10的摩尔比1.2.在最佳工艺条件下产物收率可达48.72%.采用红外光谱(FTIR)对产物结构进行了鉴定.采用在线红外光谱(online FTIR)手段对反应进程进行跟踪,检测出生成了中间体.基于相关实验数据,合理地提出了反应机理.产物的临界胶束浓度(CMC)为1.19×10-3mol/L,该数值较小,在CMC下的表面张力为40.13 m N/m.该乳化剂对沥青的乳化能力良好,得到的乳化沥青有良好的储存稳定性,归属于慢裂型产品.

Synthesis of Nonylphenol Polyoxyethylene Ether Type Cationic Asphalt Emulsifier and Its Investigation by Online FTIR Spectrophotometry

A novel cationic asphalt emulsifier of N-( 3-polyoxyethylene nonyl phenyl ether( 10)-2-hydroxyl)propyl-N,N,N-triethyl ammonium chloride is synthesized by nonylphenol polyoxyethylene ether( NP-10),epichlorohydrin and triethylamine. The optimum reaction condition is obtained. The yield reaches 48. 72% at the optimum conditions of the feedstock mole ratio of Na OH to NP-10 1. 0,the mole ratio of epichlorohydrin to NP-101. 2,the mole ratio of triethylamine to NP-10 1. 2,reaction temperature 70 ℃ and reaction time 8 h. The structure of the emulsifier is identified by FTIR. The synthesis process is monitored by online FTIR technique and the intermediate is detected. Based upon the experimental data,a plausible reaction mechanism is proposed for the reaction. The critical micelle concentration( CMC) of the asphalt emulsifier has a lower value of 1. 19 × 10- 3mol / L. The surface tension at CMC is 40. 13 m N / m. The asphalt emulsifier has good surface activity and satisfactory emulsification effect. The prepared bituminous emulsion shows higher storage stability. The emulsifier belongs to slow-set asphalt emulsifier.