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采用可聚合单体直接共聚法,以过硫酸铵(APS)为引发剂,选用丙烯酸(AA)、甲基丙烯磺酸钠(SMAS)、烯丙基聚氧乙烯醚(JFB-23)为单体合成了聚羧酸系减水剂,考察了SMAS、AA、JFB-23物质的量之比、引发剂用量、聚合温度、滴加时间和保温时间对合成的聚羧酸减水剂性能的影响。减水剂的结构和分子质量分别用FTIR和GPC进行表征。结果表明最佳实验条件为SMAS、AA、JFB-23的物质的量之比为0.8∶3∶1,引发剂用量为单体总质量的4%,聚合温度为85℃,滴加时间为2 h,保温时间2.5 h。
Polymerization was carried out by using the method of direct copolymerization of polymerizable monomer, ammonium persulfate (APS) as initiator, acrylic acid (AA), sodium methacylsulfonate (SMAS) and allyl polyoxyethylene ether (JFB-23) Polycarboxylate superplasticizer was synthesized and the effects of the amount ratio of SMAS, AA and JFB-23, the amount of initiator, the polymerization temperature, the dropping time and the holding time on the properties of polycarboxylate superplasticizer influences. The structure and molecular weight of water reducer were characterized by FTIR and GPC, respectively. The results showed that the best experimental conditions for the material ratio of SMAS, AA, JFB-23 is 0.8: 3: 1, the amount of initiator is 4% of the total mass, the polymerization temperature is 85 ℃, the dropping time is 2 h, holding time 2.5 h.