缓释型聚羧酸减水剂的分子结构设计及制备

发布时间：2018-01-13 20:40

本文关键词：缓释型聚羧酸减水剂的分子结构设计及制备　出处：《建筑材料学报》2017年04期 　论文类型：期刊论文

【摘要】：基于2-甲基丙-2-烯基聚乙二醇醚-丙烯酸(HPEG-AA)体系研究了接枝密度、主链聚合度及侧链长度对聚羧酸减水剂(PCE)净浆流动度的影响,建立了PCE理想分子结构的数学模型,研究了酯基密度对PCE性能的影响.采用相对分子质量为4 000的HPEG设计并制备出2种缓释型减水剂PC-R1和PC-R2.对缓释型PCE的分子结构进行了表征,采用凝胶色谱仪(GPC)测定了其重均相对分子质量和数均相对分子质量,用红外光谱表征了其官能团.研究了掺缓释型PCE的新拌混凝土性能和硬化混凝土性能,验证了所建数学模型和设计方法的正确性.
[Abstract]:2- -2- methyl vinyl ether acrylic acid polyethylene glycol (HPEG-AA) system based on the study of graft density, the main chain and side chain length on the degree of polymerization of polycarboxylate superplasticizer (PCE) paste fluidity influence, establishes the mathematical model of PCE ideal molecular structure, studied the effect of ester density on the performance of PCE used. The relative molecular mass of 4000 HPEG designed and prepared 2 kinds of sustained-release reducing agent PC-R1 and PC-R2. on the molecular structure of the slow-release PCE were characterized by gel chromatography (GPC) and the average molecular weight and number average relative molecular mass was determined by infrared spectroscopy, characterized the functional properties of fresh. The performance of concrete and hardened concrete were studied with slow release PCE, validated the mathematical model and design method.

【作者单位】：中建材中岩科技有限公司;中国建筑材料科学研究总院;
【分类号】：TU528.042.2
【正文快照】： 近年来,中国对内加大基础设施建设,对外积极参与国外重点工程项目及高铁技术的输出,这都离不开高性能混凝土技术的提高[1],对混凝土外加剂特别是聚羧酸减水剂(PCE)也提出了更高、更多样化的需求.前人已在PCE的制备、性能、应用与作用机理方面进行了大量的工作[2-4],也取得了一

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