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以MPEGMA(马来酸单聚乙二醇单甲醚酯)、SMAS(甲基丙烯磺酸钠)和IA(衣康酸)等为主要原料,通过分子结构设计合成了MPEGMA-SMAS-IA三元共聚的聚羧酸系减水剂,并考察了单体配比、引发剂含量和聚合时间等对其性能的影响。研究结果表明:当n(MPEGMA):n(SMAS):n(IA)=1:0.9:0.2、聚合温度为80℃、聚合时间为5 h和w(引发剂)=10%(相对于单体总质量而言)时,聚羧酸系减水剂的综合性能相对较好;以此作为改性剂,当w(减水剂)=0.33%(相对于水泥质量而言)、水灰比为0.29时,改性水泥净浆的流动度(272 mm)相对最大。
MPEGMA-SMAS-IA tris (3-hydroxyethyl methacrylate) was synthesized by molecular structure design using MPEGMA (monoglyceryl maleate), SMAS (sodium methallyl sulfonate) and IA (itaconic acid) as main raw materials Yuan polycarboxylate superplasticizer, and investigated the monomer ratio, initiator content and polymerization time on its performance. The results show that when n (MPEGMA): n (SMAS): n (IA) = 1: 0.9: 0.2, the polymerization temperature is 80 ℃, the polymerization time is 5 h and w (initiator) The overall performance of the polycarboxylate water reducing agent is relatively good; as a modifier, when w (water reducer) = 0.33% (with respect to the mass of the cement), the water ash When the ratio is 0.29, the fluidity (272 mm) of the modified cement paste is the largest.