聚羧酸系高效减水剂合成工艺的优化研究  

Optimization of synthesis process of polycarboxylate superplasticizer

作　　者：戚龙娟 王立艳[1] 李修固 盖广清[1] QI Long-juan;WANG Li-yan;LI Xiu-gu;GAI Guang-qing(Jilin building energy saving technology Engineering Laboratory,School of Materials Science and Engineering,Jilin Jianzhu University,Changchun 130118 China)

机构地区：[1]吉林建筑大学材料科学与工程学院吉林省建筑节能技术工程实验室,吉林长春130118

出　　处：《化学研究与应用》2022年第1期219-224,共6页Chemical Research and Application

基　　金：吉林省产业技术研究与开发项目(2019C059)资助;住房与城乡建设部研究开发项目(2019-K-050)资助;吉林省科技发展计划项目(20180520217JH)资助。

摘　　要：以甲基烯丙基聚氧乙烯醚(HPEG)和丙烯酸(AA)为单体,以过氧化氢-抗坏血酸(H2O2-Vc)为氧化还原引发体系,以巯基丙酸(MPA)为链转移剂,共聚合成了HPEGAA型聚羧酸减水剂。研究了合成温度、酸醚比及引发剂用量对聚羧酸减水剂分散性能的影响。结果表明,聚羧酸减水剂的最佳合成工艺为:n(AA):n(HPEG)=3.5:1;H_(2)O_(2)及MPA用量分别为HPEG大单体质量的0.67%和0.34%;合成温度为40℃。合成的HPEGAA型减水剂具有高效分散性与分散保持性,水泥净浆初始流动度可达到320mm,2h流动度仍可保持304mm。当减水剂折固掺量为0.2%时,水泥胶砂减水率为26%,加入减水剂后试块抗折强度提高了12%,抗压强度提高了20%。A HPEGAA type polycarboxylate superplasticizer was synthesized by copolymerization of methyl allyl polyoxyethylene ether(HPEG)and acrylic acid(AA).Hydrogen peroxide and ascorbic acid was used as redox initiator,andβ-mercaptopropionic acid was used as chain transfer agent.The influence of synthesis temperature,monomer molar ratio and initiator dosage on the dispersion performance of polycarboxylate superplasticizer was discussed.The results indicate that the optimum synthesis process for polycarboxylate superplasticizer is as follows:n(AA):n(HPEG)=3.5:1;the amount of H_(2)O_(2) and MPA is 0.67%and 0.34%of the mass of HPEG,respectively;the synthesis temperature is 40℃.The synthesized HPEGAA type polycarboxylate superplasticizer has high efficiency dispersibility and dispersive retentivity.The initial fluidity of cement pastes with HPEGAA superplasticizer reached up to 320mm and this high fluidity still could be maintained at 304mm for 2h.When the content of superplasticizer is 0.2%,the water reduction rate of mortar reached up to 26%,and the flexural strength and compressive strength of mortar were increased by 12%and 20%,separately.

关 键 词：聚羧酸减水剂 甲基烯丙基聚氧乙烯醚 丙烯酸 

分 类 号：O633.1[理学—高分子化学]