A novel cationic asphalt emulsifier N,N-dimethyl-N-(oxiran-2-ylmethyl)octadecan-1-aminium chloride was synthesized by reaction of epichlorohydrin and N,N-dimethyloctadecylamine. The optimum reaction condition was obtained. The yield and epoxy group value reached 98.0 and 41.8 %, respectively, at the optimum conditions: reaction temperature of 50 °C, reaction time of 5 h, and feedstock mole ratio of epichlorohydrin to N,N-dimethyloctadecylamine of 1.2. The chemical structure of the emulsifier was confirmed by Fourier-transform infrared (FTIR), 1H nuclear magnetic resonance (NMR), and elemental analysis. The synthesis process was monitored by the online FTIR technique. The by-product was detected by online FTIR analysis. Based upon the experimental data, a plausible reaction mechanism is proposed for the reaction. The critical micelle concentration (CMC) of the emulsifier has a lower value of 4.35 × 10−4 mol/L. The surface tension at CMC is 28.51 mN/m. The emulsifier exhibits satisfactory emulsification. The prepared bituminous emulsion showed higher storage stability. The emulsifier belongs to the class of medium-set asphalt emulsifiers.
Research on Chemical Intermediates – Springer Journals
Published: Jun 29, 2013
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