化工进展2018，Vol.37Issue(6)：2364-2369,6.DOI:10.16085/j.issn.1000-6613.2017-1484
磷酸酯功能单体对聚羧酸减水剂抗泥性能的影响
Effect of phosphate functional monomer on anti-clay properties of polycarboxylate superplasticizer
摘要
Abstract
Polycarboxylate superplasticizer bearing phosphate group was synthesized by aqueous solution radical polymerization,using acrylic acid(AA),methyl allyl polyoxyethylene ether(HPEG) and 2-hydroxyethyl methacrylate phosphate(HEMAP)as monomers,hydrogen peroxide(H2O2)and ascorbic acid(Vc)as initiators,and thioglycolic acid as the chain transfer agent. The copolymer was characterized by FTIR and 1H NMR. In order to investigate the effect of phosphate functional monomer on anti-clay properties of polycarboxylate superplasticizer,the water reduction performance of the superplasticizer was investigated by fluidity tests. The interlayer spacing of montmorillonite modified with superplasticizer was measured by X-ray diffraction(XRD). Adsorption of water reducing agents on cement and montmorillonite were measured by Total Organic Carbon(TOC)analyzer. The results showed that the fluidity of cement paste can exceed 275mm after 2h,when the dosage of superplasticizer was 0.20% of cement mass and the content of montmorillonite was 2% of cement.Compared with the interlayer spacing of montmorillonite treated with pure water,the interlayer spacing of montmorillonite treated with polycarboxylate superplasticizer containing phosphate did not change significantly and the side chains of the superplasticizer did not intercalate into the interlayer of montmorillonite. The adsorption process of polycarboxylate superplasticizer with phosphate group on montmorillonite was in accordance with the quasi-second-order adsorption kinetic equation. Phosphate ester group competed with carboxyl group for adsorption,which effectively weakened the adsorption of carboxyl group on montmorillonite.关键词
聚羧酸减水剂/磷酸酯/蒙脱土/净浆流动度/吸附Key words
polycarboxylate superplasticizer/phosphate/montmorillonite/cement paste fluidity/adsorption分类
建筑与水利引用本文复制引用
张光华,危静,崔鸿跃..磷酸酯功能单体对聚羧酸减水剂抗泥性能的影响[J].化工进展,2018,37(6):2364-2369,6.基金项目
国家自然科学基金项目(21176148). （21176148）
