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硅烷改性聚羧酸减水剂的合成及应用性能研究
作者：张振亚1，2，温小栋1，2
（1.宁波工程学院 建筑与交通工程学院，浙江 宁波 315211；2.云南民族大学 电气信息工程学院，云南 昆明 650504）
摘要：通过丙烯酸（AA）、异戊烯基聚氧乙烯醚（TPEG）和甲基丙烯酰氧丙基三甲氧基硅烷（KH-570）的水溶液自由基共聚合成硅烷改性聚羧酸减水剂PCE-1。研究了单体比例、聚合工艺对减水剂分散性的影响。结果表明，该减水剂的最佳制备工艺为：n（AA）∶n（KH-570）∶n（TPEG）=4.5∶1∶1，链转移剂用量为单体总物质的量的3%，聚合温度为45 ℃。在此条件下合成的减水剂相对无硅烷改性的聚羧酸减水剂PCE-2对水泥颗粒具有更强的吸附能力，因而分散性明显提高，可显著降低砂浆黏度。掺PCE-1的混凝土2 h扩展度比掺PCE-2的大80 mm，初始和2 h的排空时间分别缩短3.8 s和13.7 s。
关键词：聚羧酸减水剂；KH-570；改性；降黏
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2019）07-0122-04
Synthesis and application performance of silane modified polycarboxylate superplasticizer
ZHANG Zhenya1，2，WEN Xiaodong1，2
（1.School of Civil and Transportion Engineering，Ningbo University of Technology，Ningbo 315211，China；
2.School of Electrical Information Engineering，Yunnan Nationalities University，Kunming 650504，China）
Abstract：A novel silane modified polycarboxylate superplasticizer PC-1 for concrete was prepared by aqueous free radical polymerization of acrylic acid（AA），isopentene polyoxyethylene ether（TPEG） and γ-methacyloxypropyltrimethoxylsilane（KH-570）.
Effects of monomer ratio of and polymerization process on the dispersibility of superplasticizer were studied. The results show that when AA∶TPEG∶KH-570=4.5∶1∶1，chain-transfer agent dosage 3%，reaction temperature 45 ℃，show best dispersity performance. The synthetic silane modified polycarboxylate superplasticizer has a stronger adsorption capacity to cement particles than non-silane modified polycarboxylate superplasticizer，thus the dispersion performance is obviously enhanced and the viscosity of mortar can be significantly reduced. Slump flow after 2 h of the concrete made of this silane modified superplasticizer is 80 mm larger than that of the contrast sample，and draining time at the initial time and after 2 h are 3.8 s and 13.7 s less respectively.
Key words：polycarboxylate superplasticizer，KH-570，modification，viscosity-reducing