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VPEG型聚羧酸减水剂低温制备及其性能研究
作者：王昭鹏，钟丽娜，柯余良，方云辉，张小芳
（科之杰新材料集团有限公司，福建 厦门 361101）
摘要：采用新型聚醚大单体4-羟丁基乙烯基聚氧乙烯醚（VPEG）和小单体丙烯酸，在低温双氧水-还原剂体系中，通过自由基聚合制备了VPEG型聚羧酸高性能减水剂。通过正交试验及单因素试验确定了最佳合成工艺。采用傅里叶红外光谱（FTIR）、凝胶渗透色谱（GPC）等对减水剂进行了表征。结果表明，该减水剂的最佳合成工艺为：酸醚比为3.87，双氧水（H2O2）、甲醛合次硫酸氢钠（FF6）、硫代乙醇酸（TGA）的用量分别为大单体质量的1.25%、0.18%、0.45%，聚合温度为10 ℃，保温时间为1 h；所合成的减水剂与预期设计相符合，且比市售同类减水剂的分散性和保坍性更优。
关键词：VPEG；聚羧酸减水剂；低温合成；结构性能
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2022）01-0085-04
Low-temperature preparation and performance study of VPEG-type polycarboxylate superplasticizer
WANG Zhaopeng，ZHONG Lina，KE Yuliang，FANG Yunhui，ZHANG Xiaofang
（KZJ New Materials Group Co. Ltd.，Xiamen 361101，China）
Abstract：The VPEG polycarboxylate superplasticizer was synthesized by free radical polymerization using a new polyether monomer（4-hydroxybutyl vinyl polyoxyethylene ether） as the starting agent and acrylic acid as the small monomer under low temperature hydrogen peroxide-reducer system. The optimal synthesis process was determined by orthogonal experiment and single factor experiment. And it is characterized by Fourier infrared spectroscopy（FTIR） and gel permeation chromatography（GPC）. The test results showed that the best synthesis process：the ratio of acid to ether was 3.87，the amount of H2O2，FF6 and TGA were 1.25%，0.18% and 0.45% of the mass percentage of the VPEG，the polymerization temperature was 10 ℃，and the temperature was held for one hour. The VPEG polycarboxylate superplasticizer conforms to the expected design and has better dispersion and slump retention performance than the commercially available water reducer.
Key words：VPEG，polycarboxylate superplasticizer，low-temperature synthesis，structure property