摘要
采用先酯化后共聚的方法合成聚羧酸系减水剂,考察以甲基丙烯酸(MMA)和甲氧基聚乙二醇(MPEG)为原料酯化合成大单体甲氧基聚乙二醇甲基丙烯酸酯(MPEGMA)过程中阻聚剂对苯二酚用量、酸醇摩尔比、反应温度等对酯化率的影响.以大单体MPEGMA与马来酸酐、MMA和2-丙烯酰胺基-2-甲基丙烷磺酸共聚合成聚羧酸类减水剂,考察减水剂合成过程中MPEG相对分子质量和引发剂过硫酸铵用量以及减水剂掺量对减水剂性能的影响.结果表明:阻聚剂质量分数为0.4%、酸醇摩尔比为1.5∶1、反应温度为120℃时,酯化率可达到92.3%.当MPEG相对分子质量为1 000、引发剂的质量分数为5%,合成的减水剂掺量质量分数为0.3%时,水泥的净浆流动度可达281 mm.
Polycarboxylate based superplasticizer was synthesized by esterification and polymerization. The influences of inhibitor dosage, mole ratio of methacrylic acid （MMA） to methoxy polyoxyethy lene （MPEG） and reaction temperature on the yield of esterification for methoxy（polyethyleneglycol） methacrylate （MPEGMA） were studied. The influences of the amount of superplasticizer, the molecular weight of MPEG and the amount of initiator were also investigated on the copolymerization for polycarboxylate based superplasticizer by MPEGMA, maleic anhydride, MMA and 2-acryloylamino-2-methyl-1-propanesulfonic acid. The results indicated that at the inhibitor dosage of 0.4% ,mole ratio of methacrylic acid to MPEG of 1.5：1 and reaction temperature of 120 ℃ ,the yield of MPEGMA could reach 92.3%. Thus, the fluidity of the cement paste could reach 281 mm with 0.3% percentage mass content of this polycarboxylate based superplasticizer with the molecular weight of MPEG 1 000 and initiator amount of 5%.
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2009年第6期12-15,72,共5页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省重大科技成果转化基金资助项目(BA200620)
国家高技术研究发展计划(863计划)资助项目(2009AA03Z222)
国家自然科学基金资助项目(20906013)
关键词
甲氧基聚乙二醇甲基丙烯酸酯
聚羧酸系减水剂
酯化
共聚
methoxy （polyethyleneglycol） methacrylate
polycarboxylate based superplasticizer
esterifi- cation
copolymerization
