丁二酸酐酯化改性聚羧酸长侧链端羟基及减水剂

（武汉理工大学 化学化工与生命科学学院，湖北 武汉  430070）

    摘要：将甲基烯丙基聚氧乙烯醚（HPEG）与丁二酸酐（SAE）进行酯化，得到聚醚端羟基被丁二酸酯化的改性聚醚（SAE-HPEG）。再以不同比例的SAE-HPEG和HPEG与丙烯酸聚合，得到一系列分子中含SAE-HPEG长支链的新型聚羧酸减水剂（SAE-PCE）。采用红外光谱和核磁氢谱对SAE-PCE的分子结构进行了表征，并对改性前后PCE在水泥浆体中的吸附量进行了测试比较，试验结果表明，改性后减水剂SAE-PCE具有良好的分散性和分散保持性。

    关键词：聚羧酸减水剂；端羟基酯化改性；水泥；砂浆；流动性

    中图分类号：TU528.042+.2        文献标识码：A        文章编号：1001-702X（2018）08-0035-03

 

Longside chain hydroxyl group of polycarboxylate superplasticizer modified with

succinic anhydride and superplasticizer performance

DU Yong，GUO Liping，CHEN Gang，CHEN Changliang，LEI Jiaheng

（School of Chemistry，Chemical Engineering and Life Sciences，Wuhan University of Technology，Wuhan 430070，China）

  Abstract：A modified polyether（SAE-HPEG） with polyether terminal hydroxyl groups esterified by butanedioic acid was obtained by the esterify of methyl allyl polyoxyethylene ether（HPEG） and succinic anhydride（SAE）. And a series of novel polycarboxylate superplasticizer（SAE-PCE） with SAE-HPEG long-chain branches were synthesized by the polymerization of different proportions of SAE-HPEG and HPEG with acrylic acid. FTIR and 1HNMR were used to characterize the structure of SAE-PCE，and the adsorption capacity of PCE and SAE-PCE in cement paste were also measured and compared. The experimental results show that the modified superplasticizer SAE-PCE has good dispersity and dispersion stability.

    Key words：polycarboxylate superplasticizer，esterification of terminal hydroxyl，cement，mortar，fluidity