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早强型聚羧酸高性能减水剂的合成及应用研究
作者：徐忠洲，周普玉，范瑞波，王小燕，王丽秀
（山西佳维新材料股份有限公司，山西 运城 044000）
摘要：以高侧链聚合度的甲基烯丙基聚氧乙烯醚（HPEG-4000）、丙烯酸（AA）、丙烯酰胺（AM）、2-丙烯酰胺-2-甲基丙磺酸（AMPS）为聚合单体，在H2O2-VC氧化还原引发下，利用自由基聚合反应合成了一种早强型聚羧酸高性能减水剂。探讨了各因素对减水剂分散性和早强性的影响，确定了最佳合成工艺条件。通过混凝土应用性能对比及在装配式预制构件中的应用结果表明，早强型聚羧酸减水剂ZQPC-I具有较高的减水率和良好的工作性能，可有效促进水泥水化，大幅提高混凝土的早期强度。
关键词：聚羧酸；酰胺基；早期强度；装配式预制构件
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2019）02-0057-04
Research on synthesis and application of polycarboxylate superplasticizer with early strength
XU Zhongzhou，ZHOU Puyu，FAN Ruibo，WANG Xiaoyan，WANG Lixiu
（Shanxi Jiawei New Materials Co. Ltd.，Yuncheng 044000，China）
Abstract：Using the H2O2-VC as redox initiator，a type of polycarboxylate superplasticizer with high early strength was synthesized by free radical aqueous solution polymerization with methyl allyl polyoxyethylene ether with high side chain degree of polymerization（HPEG-4000），acrylic acid（AA），acrylamide（AM），2-acrylamide-2-methylpropanesulfonic acid（AMPS）. The influence of the synthesis process on dispersibility and early strength of superplasticizer were discussed，and the optimum synthesis conditions were determined. By comparing the performance of concrete and applying in prefabricated construction precast concrete components，test results indicated that the early strength polycarboxylate superplasticizer ZQPC-I has higher water-reducing and good workability，effectively promote the hydration of cement and greatly enhance the early strength of concrete.
Key words：polycarboxylate，amide groups，early strength，precast concrete components