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降黏型聚羧酸系减水剂的制备与性能研究
作者：王小燕，周普玉，徐忠洲，高文富，朱佳宁，张智达
（山西佳维新材料股份有限公司，山西 运城 044000）
摘要：针对高强度等级混凝土在低水胶比条件下出现的黏度大、流速慢、不易泵送等问题，研发了一种降黏型聚羧酸系减水剂。讨论酸醚比、甲基丙烯酸甲酯、引发剂、链转移剂用量等对减水剂分散性能及降黏性能的影响。结果表明，在酸醚比为3.25，甲基丙烯酸甲酯、引发剂、链转移剂用量分别为单体质量的2.0%、0.75%、0.49%时，所合成的减水剂分散和保持性能最佳，且拌制的混凝土松软、流速快。与市售同类产品相比，合成减水剂能显著降低高强度等级混凝土的黏度。
关键词：降黏；功能单体；聚羧酸系减水剂；合成研究
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2019）01-0109-04
Research on preparation and properties of viscosity-reducing polycarboxylate type superplasticizer
WANG Xiaoyan，ZHOU Puyu，XU Zhongzhou，GAO Wenfu，ZHU Jianing，ZHANG Zhida
（Shanxi Jiawei New Materials Co. Ltd.，Yuncheng 044000，China）
Abstract：In this paper，a low viscosity polycarboxylate type superplasticizer was developed to solve the problems of high viscosity of cement，slow flow rate and difficulty of pumping under low water cement ratio conditions of high-grade concrete. The effects of the molar ratio of ether to ether，methyl methacrylate，initiator and chain transfer agent on the dispersibility and viscosity reduction of superplasticizer were discussed. The results show that the superplasticizer has the excellent dispersion and retention performance when the molar ratio of ether to ether was 3.25，the methyl methacrylate，initiator and chain transfer agent were 2.0%，0.75% and 0.49% respectively. And the mixed concrete showed soft，fast flow. Compared with the product commercially available，the synthesized products can reduce the viscosity of high grade concrete significantly.
Key words：viscosity-reducing，functional monomers，polycarboxylate superplasticizer，synthesis research