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两性早强型聚羧酸减水剂的制备及其性能研究
作者：何舜，胡欣，吴金国，徐强
（江西省建筑材料工业科学研究设计院，江西 南昌 330200）
摘要：以异戊二烯基聚氧乙烯基醚（TPEG）为大单体，丙烯酸（AA）、2-丙烯酰胺-2-甲基丙磺酸（AMPS）和甲基丙烯酰氧乙基三甲基氯化铵（DMC）为小单体，合成了一种两性早强型聚羧酸减水剂（PCE）。对比分析了两性PCE与阴离子型PCE对水泥吸附-分散性、凝结时间及水化性能的影响。结果表明，两性PCE相对于普通阴离子型PCE，其在水泥颗粒表面的吸附速率较低，达到吸附平衡时的饱和吸附量较小，对水泥浆体的分散保持性较好，可一定程度缩短水泥凝结时间，对预制混凝土早期具有增强作用。
关键词：聚羧酸减水剂；两性早强型；合成；性能
中图分类号：TU528.042+.2 文献标识码：A 文章编号：1001-702X（2020）08-0018-04
Study on the preparation and properties of amphoteric-early strength-type polycarboxylate superplasticizer
HE Shun，HU Xin，WU Jinguo，XU Qiang
（Jiangxi Construction Materials Industry Research and Design Institute，Nanchang 330200，China）
Abstract：An amphoteric-early strength-polycarboxylate superplasticizer（PCE） was synthesized with isoprene polyoxyethylene ether（TPEG） as macromonomer，acrylic acid（AA），2 acrylamide 2-methylpropanesulfonic acid（AMPS） and methacrylic ethyl trimethyl ammonium chloride（DMC） as small monomers. The effects of amphoteric-early strength-polycarboxylate superplasticizer on adsorption-dispersion，setting time and hydration properties of cement paste were analyzed，in comparison with that of anionic polycarboxylate superplasticizer. The results show that the adsorption rate of amphoteric-early strength-polycarboxylate superplasticizer on the surface of cement particles is lower than that of ordinary anionic polycarboxylate superplasticizer，and the saturated adsorption capacity is lower that of the anionic polycarboxylate superplasticizer at the equilibrium adsorption point. Added with amphoteric-early strength-polycarboxylate superplasticizer，the dispersion and retention of cement paste is better，the setting time of cement can be shortened to a certain extent，and the hydration reaction rate of cement mineral components can be promoted in the early stage of precast concrete.
Key words：polycarboxylate superplasticizer，amphoteric early-strength type，synthesis，properties