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磷酸基团改性聚羧酸减水剂对硫酸盐适应性改善效果
作者：何易1，舒鑫2，王秀梅2，杨勇2，刘加平1，冉千平2
（1.东南大学 材料科学与工程学院，江苏 南京 211189；2.江苏苏博特新材料股份有限公司，江苏 南京 211103）
摘要：为系统探究磷酸基团改性聚羧酸减水剂对硫酸盐适应性的改善效果及作用规律，合成了一系列不同取代方式及取代比例的磷酸基团改性聚合物，通过结构表征、吸附量及流动度测试、屈服应力拟合，研究其在硫酸盐环境下的吸附-分散作用规律。结果表明，具有较多负电荷和较强Ca2+络合作用的磷酸基团能有效降低SO42-的竞争吸附，改善聚羧酸减水剂的硫酸盐适应性问题，其中以等物质的量取代的磷酸基团改性聚合物的硫酸盐适应性为最优。
关键词：聚羧酸减水剂；硫酸盐适应性；流体力学半径；竞争吸附；净浆流动度；屈服应力
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2019）10-0072-06
Improvement effect of phosphate-modified polycarboxylate superplasticizer on sulfate adaptability
HE Yi1，SHU Xin2，WANG Xiumei2，YANG Yong2，LIU Jiaping1，RAN Qianping2
（1.School of Material Science and Engineering，Southeast University，Nanjing 211189，China；
2. Jiangsu Sobute New Materials Co. Ltd.，Nanjing 211103，China）
Abstract：In order to systematically explore the improvement effect and mechanism of phosphate-modified polycarboxylate superplasticizer on sulfate adaptability，a series of phosphate-modified polymers with different substitution modes and different substitution ratios were synthesized. The adsorption-dispersion law in the sulfate environment was investigated by structural characterization，adsorption amount and fluidity measurement and yield stress fitting. And the results show that the phosphate group with more negative charges and stronger Ca2+ complexation could effectively reduce the competitive adsorption of SO42-，and significantly improve the sulfate adaptability of polycarboxylate superplasticizer. Especially the phosphate-modified polymer substituted by equimolar number had excellent sulfate adaptability.
Key words：polycarboxylate superplasticizer，sulfate adaptability，hydrodynamic radius，competitive adsorption，fluidity of slurry，yield stress