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以甲基丙烯酸聚乙二醇单甲醚酯600(MPEGMAA600)、烯丙基磺酸钠(SAS)、马来酸酐(MAH)和2-丙烯酰胺-2-甲基丙磺酸(AMPS)为原料,过硫酸铵-硫代硫酸钠为引发剂,合成了MPEGMAA-SAS-MAH-AMPS聚羧酸减水剂。经正交试验选出最佳合成工艺条件为∶n(MPEGMAA600)∶n(SAS)∶n(MAH)∶n(AMPS)=1.0∶0.3∶1.0∶0.4,过硫酸铵-硫代硫酸钠引发体系占聚合单体总质量的0.4%,聚合温度50℃,聚合时间4 h。该条件下单体转化率为93.67%。红外光谱仪和凝胶色谱分析结果表明,该减水剂链段中含有羧基、氨基、磺酸基、醚键等官能团,平均相对分子质量分布集中,峰值大都集中在1万~1.4万之间。
Polyethylene glycol monomethyl ether acetate 600 (MPEGMAA600), sodium allylsulfonate (SAS), maleic anhydride (MAH) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) Raw materials, ammonium persulfate - sodium thiosulfate as initiator, synthesized MPEGMAA-SAS-MAH-AMPS polycarboxylate superplasticizer. The optimal synthesis conditions were as follows: n (MPEGMAA600): n (SAS): n (MAH): n (AMPS) = 1.0: 0.3:1.0:0.4, ammonium persulfate-sodium thiosulfate System accounted for 0.4% of the total mass of the monomer, the polymerization temperature 50 ℃, polymerization time 4 h. Under these conditions, the monomer conversion was 93.67%. The results of FTIR and gel permeation chromatography showed that the superplasticizer segment contained functional groups such as carboxyl group, amino group, sulfonic acid group and ether bond. The average molecular weight distribution of the superplasticizer chain was concentrated. The peak value was mostly between 10,000 and 14,000.