摘要
以丙烯酸(AA)、异丁烯醇聚氧乙烯醚(HPEG)、甲基丙烯磺酸钠(SMAS)等为单体,分别采用丙烯酰胺(AM)、羟甲基丙烯酰胺(HAM)取代部分丙烯酸,通过水溶液聚合法制备出具有早强功能的聚羧酸系减水剂,并探讨了合成条件对水泥净浆流动度的影响.研究结果表明:在单体摩尔比n(AA)∶n(HPEG)∶n(SMAS)=4∶1∶0.36、反应温度为80℃、过硫酸铵(APS)用量为单体总质量的3%时,制备出的聚羧酸减水剂的分散性能较优.当AM取代为18%时,对提高混凝土的早期强度效果较佳,AM比HAM具有更好的早强效果.
Early strength polycarboxylate superplasticizer was synthesized by aqueous solution polymerization with acrylic acid （AA）, isobutylene alcohol ethoxylates （HPEG）, sodium methacrylic sulfonate （SMAS）, acrylamide （AM） or methylolacrylamide （HAM）. The influence of the synthesis process on fluidity of cement paste was discussed. The results showed that the polycarboxylate superplasticizer which had the good performance was prepared when the molar ratio of acrylic acid,isobutylene alcohol ethoxylates, sodium and methacrylic sulfonate was 4：1： 0.36,the reaction temperature was about 80 ℃, the amount of initiator was 3% to the weight of total monomer. Moreover, 18% placement rate by AM had good early strength effect, the early strength effect of AM was better than HAM.
出处
《陕西科技大学学报（自然科学版）》
2014年第4期61-65,共5页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(21303098
21176148)
关键词
聚羧酸减水剂
合成
水泥净浆流动度
早强
polycarboxylate superplasticizer
synthesis
fluidity of cement paste
early strength
