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三臂交联型聚羧酸高效减水剂的制备与性能研究
作者：胡聪，周栋梁，舒鑫，杨勇
（高性能土木工程材料国家重点实验室，江苏苏博特新材料股份有限公司，江苏 南京 211103）
摘要：以甘油、丙烯酸和甲基烯丙基聚氧乙烯醚为主要原料，通过简单的两步法设计合成了一系列交联程度、分子质量不同的新型三臂交联型聚羧酸高效减水剂（Tri-PCE）和梳状聚羧酸高效减水剂，并采用核磁共振和红外光谱对合成产物的结构进行了表征。净浆和砂浆试验结果表明：与梳形聚羧酸减水剂相比，Tri-PCE的初始分散性及分散保持性略低；在水泥浆中Tri-PCE的吸附量较高，并且饱和吸附量与交联程度正相关；同时，多臂体型的拓扑结构可以有效改善浆体的和易性、增大拌合物的含气量、提高新拌水泥砂浆的工作性能。
关键词：三臂交联；聚羧酸减水剂；合成；和易性
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2021）02-0001-06
Synthesis and performances of a novel three-arm crosslinked polycarboxylate superplasticizer
HU Cong，ZHOU Dongliang，SHU Xin，YANG Yong
（State Key Laboratory of High Performance Civil Engineering Materials，Jiangsu Sobute New Materials Co. Ltd.，Nanjing 211103，China）
Abstract：A series of novel three-arm cross-linked polycarboxylate superplasticizer（Tri-PCE） and comb-like polycarboxylate superplasticizer（Comb-PCE） with different crosslinking degree and molecular weight were designed and synthesized by a simple two-step method by taking glycerin，acrylic acid and methallylpolyoxyethylene ether as main raw materials，and nuclear magnetic resonance（1H NMR） and infrared spectroscopy（IR） measurements were used for structural characterization. Compared with Comb-PCE，cement slurry containing Tri-PCE showed lower level of the dispersing capability and fluidity preservation of paste in the early stage. The adsorption behavior in cement indicated that Tri-PCE has a higher adsorption capacity and the saturation adsorption capacity is positively correlated with the cross-linking degree. At the same time，the multi-arm-type topology can effectively improve the workability of the slurry，increase the air content during mixing，so as to enhance the working performance of fresh cement-based materials.
Key words：triple-arm cross-linking，polycarboxylate superplasticizer，synthesis，workability