- 目录
- 化学建材
- 首页
缓释型聚羧酸减水剂的常温合成及其性能评价
作者：李安1，2，李顺2，温永向2，王胜年3，张洋2
（1.中交四航工程研究院有限公司，广东 广州 510230；
2.中交四航局广州南沙工程有限公司，广东 广州 510230；
2.中交四航局广州南沙工程有限公司，广东 广州 510230；
3.中交第四航务工程局有限公司，广东 广州 510290）
摘要：采用甲基烯丙基聚氧乙烯醚（TPEG）、丙烯酸、缓释功能单体三元共聚体系，在氧化还原引发体系下常温合成了一种缓释型聚羧酸减水剂（PCE），探讨了缓释功能单体种类、反应温度、酸醚比、缓释功能单体BM3等对其性能的影响。结果表明，该缓释型PCE的最佳合成工艺为：缓释功能单体选用羧酸某羟丙基酯（BM3），起始反应温度10~35 ℃，酸醚比1.8，n（BM3）∶n（TPEG）=5；掺该PCE的混凝土坍落度3 h无损失，保坍性能优于市售同类产品SK-10B。
关键词：聚羧酸减水剂；缓释型；常温；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）08-0005-04
Synthesis and performance evaluation of sustained-release polycarboxylate water reducer at room temperature
LI An1，2，LI Shun2，WEN Yongxiang2，WANG Shengnian3，ZHANG Yang2
（1.Fourth Harbor Engineering Institute Co. Ltd.，Guangzhou 510230，China；
2.Guangzhou Nansha Engineering Company of CCCC Fourth Harbor Engineering Co. Ltd.，Guangzhou 510230，China；
3.CCCC Fourth Harbor Engineering Co. Ltd.，Guangzhou 510290，China）
Abstract：A sustained-release polycarboxylate water reducer（PCE） was synthesized at room-temperature by the ternary copolymerization of methyl vinyl polyoxyethylene ether（TPEG），acrylic acid and sustained-release functional monomer under redox initiation system. The effects of the types of sustained-release functional monomers，reaction temperature，acid ether ratio and sustained- release functional monomer BM3 on the properties of PCE were discussed. The results showed that the synthesis process of sustained-release PCE was BM3，the initial reaction temperature was 10~35 ℃，acid ether ratio was 1.8，n（BM3）∶n（TPEG） was 5，and the slump of the synthesized sustained-release PCE of concrete were no loss for 3 hours. The slump retention performance of the sustained- release water reducer was better than SK-10B sustained-release PCE.
Key words：polycarboxylate water reducer，sustained-release，room temperature，synthesis，performance