抗絮凝型聚羧酸减水剂的研究与制备  

Research and Preparation of Anti-Flocculation Polycarboxylate Superplasticizer

作　　者：荐凯 钱航 于浩 胡凯伟 杨维本[1] Jian Kai;Qian Hang;Yu Hao;Hu Kaiwei;Yang Weiben(School of Chemistry and Materials Science,Nanjing Normal University,Nanjing 210023,China;Jiangsu Bositong New Materials Co.,Ltd.,Nanjing 210000,China)

机构地区：[1]南京师范大学化学与材料科学学院,江苏南京210023 [2]江苏博思通新材料有限公司,江苏南京210000

出　　处：《南京师范大学学报(工程技术版)》2025年第1期30-37,共8页Journal of Nanjing Normal University(Engineering and Technology Edition)

基　　金：国家自然科学基金项目(52070100).

摘　　要：絮凝剂聚丙烯酰胺(polyacrylamide,PAM)是机制砂生产过程中使用的添加剂,其残留会影响混凝土外加剂的性能.采用新型聚醚大单体(diethylene glycol polyethylene glycol vinyl ether,GPEG)与丙烯酸、2-甲基-2-丙烯酸-2-羟乙基酯磷酸酯等小单体共聚合反应,合成具有抗絮凝性能的减水剂D-PCE;通过对聚合过程中酸醚比、磷酸基团用量、链转移剂用量、氧化剂用量、还原剂用量、反应温度与加料时间等影响因素的系统优化,并将最优抗絮凝型减水剂与市售减水剂进行应用对比研究,制备了具有较好的流动性和保持性的抗絮凝型聚羧酸减水剂;采用红外光谱与1H核磁共振光谱探究了合成产物的结构与反应机制.研究结果对解决含有絮凝剂PAM的水泥胶砂高效率使用问题有支撑作用.Polyacrylamide(PAM)is an additive used in sand production.Its residue interferes with the performance of concrete admixtures.A new polyether macromonomer(diethylene glycol polyethylene glycol vinyl ether,GPEG)is used to react with small monomers such as acrylic acid,2-methyl-2-acrylate-2-hydroxyethyl ester phosphate,etc.,to synthesize D-PCE,an anti-flocculating polycarboxylate superplasticizer.Through the systematic optimization of the acid to ether ratio,phosphate group dosage,chain transfer agent dosage,oxidant dosage,reductant dosage,the reaction temperature and the feeding time in the polymerization process,the optimal anti-flocculation superplasticizer is compared with the commercially available superplasticizer.The structure and reaction mechanism of the synthesized products are investigated by infrared spectroscopy and 1H NMR spectroscopy.The results show that the anti-flocculating superplasticizer has better fluidity and retention in cement mortar containing flocculant PAM than the commercially available superplasticizer.

关 键 词：聚羧酸减水剂 抗絮凝 絮凝剂 聚丙烯酰胺 磷酸基团 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]