梯度缓释型聚羧酸减水剂的合成与性能研究  

Synthesis and properties of gradient-releasing polycarboxylic superplaticizers

作　　者：简振威 张金龙 邵强 钟开红 JIAN Zhenwei;ZHANG Jinlong;SHAO Qiang;ZHONG Kaihong(Guangzhou Institute of Building Science Co.,Ltd.,Guangzhou 510440,China)

机构地区：[1]广州市建筑科学研究院有限公司,广东广州510440

出　　处：《混凝土》2022年第6期57-60,共4页Concrete

基　　金：中国博士后科学基金项目(2019M662898);广州市科技计划项目(201806010028,201906010006)。

摘　　要：在双氧水-抗坏血酸引发体系下,采用丙烯酸羟丙酯(HPA)替代部分丙烯酸羟乙酯(HEA),合成具有梯度缓释性能的聚羧酸减水剂。核磁共振氢谱、红外光谱和凝胶渗透色谱结果表明HPA被成功聚合到聚羧酸减水剂分子中。水泥净浆对比试验和混凝土对比试验表明,当HPA替代HEA的量为40%或50%时,所得到的聚羧酸减水剂具有最优的缓释性能,能够实现混凝土拌合物长时间的保坍,且不影响其抗压强度。A gradient-releasing polycarboxylic superplaticizer(PCE)was synthesized by substituting the 2-hydroxyethyl acrylate(HEA)with hydroxypropyl acrylate(HPA)under the hydrogen peroxide-ascorbic acid initiator system.The analysis of 1H-NMR,FT-IR and gel permeation chromatography illustrated that HPA was successfully added into the stucture of PCE.Results on comparative experiments of cement paste and concrete demonstrated that as 40%or 50%HEA was substituted by HPA,the related PCE exhibited the optimal releasing abilities,leading to a long-time of slump-retaining with no obvious effect on the compressive strength.

关 键 词：聚羧酸减水剂 梯度缓释 保坍性能 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]