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苯甲酸酐接枝改性聚羧酸减水剂长侧链端羟基及其性能
作者：蔡建文1，韦鹏亮2，蔡宏伟1，蔡昱2，陈露一2
（1.武汉理工大学 化学化工与生命科学学院，湖北 武汉 430070；
2.中铁桥研科技有限公司，湖北 武汉 430034）
2.中铁桥研科技有限公司，湖北 武汉 430034）
摘要：采用苯甲酸酐（BA）酯化改性甲基烯丙基聚氧乙烯醚（HPEG）端羟基，制备大单体BA-HPEG，按n（HPEG）∶n（BA-HPEG）=9∶1、8∶2、7∶3的摩尔比与丙烯酸（AA）室温聚合，控制醇酸比为1∶2.5，得到3种聚羧酸减水剂BA-PCE。结果表明，BA与HPEG的端羟基酯化反应完全，所制备的3种BA-PCE其重均分子质量在36 800~37 700 g/mol，掺3%蒙脱土时，对照组及掺3种BA-PCE的水泥净浆初始流动度分别为190、260、270、275 mm，60 min后对照组已无流动性，掺3种BA-PCE的净浆流动度分别为160、175、183 mm，具有良好的抗泥保坍作用。
关键词：聚羧酸减水剂；端羟基改性；苯甲酸酐；抗泥保坍
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2023）04-0080-04
Long side chain hydroxyl group of polycarboxylate superplasticizer modified with
benzoic anhydride and its performance
CAI Jianwen1，WEI Pengliang2，CAI Hongwei1，CAI Yu2，CHEN Luyi2
（1.School of Chemistry，Chemical Engineering and Life Sciences，Wuhan University of Technology，Wuhan 430070，China；
2.China Railway Britech Co. Ltd.，Wuhan 430034，China）
Abstract：The macromonomer BA-HPEG was prepared by esterifation and modification of hydroxyl-terminated of methyl allyl polyoxyethylene ether（HPEG） by benzoic anhydride（BA）. At the mole ratio of n（HPEG）∶n（BA-HPEG）=9∶1，8∶2，7∶3，they were copolymerized with acrylic acid（AA） at room temperature and the alkyd ratio was controlled at 1∶2.5，three novel polycarboxylate superplasticizer BA-PCE were synthesized. The results showed that the hydroxyl end esterification reaction of BA and HPEG was complete，and the weight average molecular weight of the three BA-PCE were all between 36 800 and 37 700. When 3% montmorillonite is added，the initial flowability of the control group and the cement paste mixed with three types of BA-PCEs are 190，260，270，and 275 mm，respectively. After 60 minutes, the control group has no flowability，and the flowability of the cement paste mixed with three types of BA-PCEs is 160，175，and 183 mm，respectively，showing good mud resistant and slump retention behaviors.
Key words：polycarboxylate superplasticizer，modification of hydroxyl-terminated，benzoic anhydride，mud resistant and slump retention