AMPS改性聚羧酸减水剂性能研究

Study on the performance of AMPS modified polycarboxylate superplasticizer

引入2-丙烯酰胺-2-甲基丙稀磺酸(AMPS)合成磺酸盐官能团改性聚羧酸减水剂A-PCE。通过水泥净浆和水泥胶砂流动度试验研究了A-PCE减水剂的分散能力,由特征黏度试验研究了A-PCE系列减水剂的相对分子量变化规律,基于小角度XRD法研究了其在蒙脱土表面的吸附方式。结果表明:与未改性PCE相比,改性A-PCE减水剂的分散能力有所提高,当AMPS为丙烯酸AA的60%时,制备的减水剂具有最优的流动度保持能力与良好的水泥适应性,对蒙脱土的吸附形式为表层吸附,具有较强的抗泥能力。

2-acrylamide-2-methylpropane sulfonic acid(AMPS)was introduced to synthesize polycarboxylate superplasticizers(A-PCE)by low-temperature polymerization method.The dispersing ability of A-PCE was studied by the fluidity of cement paste and cement mortar.The relative molecular variation of A-PCE was studied by the characteristic viscosity,and the adsorption properties of A-PCEon the surface of montmorillonite was studied by small angle XRD.The results show that the dispersion ability of modified A-PCE is improved.When the AMPS is 60wt% of acrylic acid(AA),the prepared superplasticizer(A-PCE-2)has the best fluidity retention ability and well cement adaptability.The adsorption form of A-PCE-2 on the surface of montmorillonite is surface adsorption,which has the strongest mud resistance ability.