Synthesis And Performance Characterization Of Novel Asphalt Emulsifiers And Anti-stripping Agent

A novel betaine-type asphalt emulsifier, a cationic asphalt emulsifier and a asphalt anti-stripping agent were synthesized in this paper. The optimum reaction conditions were obtained by the close investigation of various factors that influenced the reaction yield. The reactions were tested by React IR to get theoretical data. The structures of the products were identified by FTIR. The performance tests of emulsifiers and anti-stripping agent were investigated in the mixing test with rock material.A novel betaine-type asphalt emulsifier,3-(dodecyloxy)-2-hydroxypropan-N-carboxymethyl-N,N-dimethylammonium chloride, was synthesized in a three-step reaction from lauryl alcohol, epichlorohydrin, dimethylamine, and chloroacetic acid. The optimum reaction conditions were obtained for synthesis of2-(dodecyloxymethyl)-oxirane in the first step. The structures of the three products were identified by FTIR. Synthesis of2-(dodecyloxymethyl) oxirane in the first step was monitored by online FTIR, and an intermediate was detected. The CMC of the emulsifier and the surface tension at CMC were determined by the surface tension method. The performance research indicated the product is an excellent emulsifier for asphalt. The prepared bituminous emulsion had high storage stability. The emulsifier is a medium-set asphalt emulsifier.A novel cationic asphalt emulsifier N-(3-(N’,N’-dimethylamino)-2-hydroxypropyl)-N,N-dimethyloctadecan-l-aminium chloride was synthesized in a two-step reaction of epichlorohydrin, N,N-dimethyloctadecylamine, and dimethylamine aqueous solution. The structures of the products were identified by FTIR. The first synthesis step of N,N-dimethyl-N-(oxiran-2-ylmethyl)octadecan-l-aminium chloride was monitored by online FTIR. The CMC of the emulsifier and the surface tension at CMC were determined by the surface tension method. The performance research indicated the product an excellent emulsifier for asphalt. The prepared bituminous emulsion had high storage stability. The emulsifier belongs to medium-set asphalt emulsifier.A novel phosphate type asphalt anti-stripping agent was synthesized in a two-step reaction from phosphorus pentaoxide and lauryl alcohol. Mixed phosphates were synthesized in the first step and the pyrophosphates were hydrolyzed in the second step. The optimum reaction conditions were obtained for synthesis of phosphate monoester. The structure of the phosphate monoester was identified by FTIR. The reactions were monitored by online FTIR. The performance research indicated the anti-stripping agent had strong anti-stripping power.