Abstract: Superplasticizer of MPEGAA-AA-AMPS was synthesized with self-made active macromonomer methoxyl (polyethyleneglycol) acrylate (MPEGAA)，acrylic acid (AA)，2-acrylamido-2 methyl-propane sulfonic acid (AMPS) by free radical copolymerization in agueous solution. The influences of molar ratio of monomer，dosage of initiator (APS)，reaction temperature and reaction time on the copolymerization were investigated. The results showed that the optimum reaction condition was as follows：molar ratio of MPEGAA to AA to AMPS 1∶4.3∶1.10，dosage of ammonium persulfate 5% of total monomers by mass，reaction temperature 80 ℃，reaction time 5 h. The superplasticizer MPEGAA-AA-AMPS prepared under this condition had good fluidity and plasticization，with remarkable effects of water reduction and enhancement.

Key words: superplasticizer, polymerization, synthesis, performance

摘要： 以自制的活性大单体聚乙二醇单甲醚丙烯酸酯（MPEGAA）、丙烯酸（AA）和2-丙烯酰胺基-2-甲基丙磺酸（AMPS）为原料，在水溶液中共聚合成了MPEGAA-AA-AMPS高效减水剂。重点考察了单体的摩尔比、引发剂（APS）用量、反应温度和反应时间等合成条件对MPEGAA-AA-AMPS高效减水剂的影响。结果表明：最佳的高效减水剂的合成条件是：n(MPEGAA)∶n(AA)∶n(AMPS)=1∶4.3∶1.10，引发剂APS用量为单体总质量的5%，聚合温度和反应时间分别为80 ℃和5 h。在该条件下合成的MPEGAA-AA-AMPS高效减水剂，其分散性和保塑性理想，减水增强效果明显。

关键词: 高效减水剂, 聚合, 合成, 性能