缓释型聚羧酸减水剂的常温合成及其性能评价  

Synthesis and performance evaluation of sustained-release polycarboxylate water reducer at room temperature

作　　者：李安[1,2] 李顺 温永向 王胜年 张洋[2] LI An;LI Shun;WEN Yongxiang;WANG Shengnian;ZHANG Yang(Fourth Harbor Engineering Institute Co.Ltd.,Guangzhou 510230,China;Guangzhou Nansha Engineering Company of CCCC Fourth Harbor Engineering Co.Ltd.,Guangzhou 510230,China;CCCC Fourth Harbor Engineering Co.Ltd.,Guangzhou 510290,China)

机构地区：[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 [3]中交第四航务工程局有限公司,广东广州510290

出　　处：《新型建筑材料》2020年第8期5-8,13,共5页New Building Materials

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。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.

关 键 词：聚羧酸减水剂 缓释型 常温 合成 性能 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]