聚氨酯改性聚羧酸盐的合成及与水泥净浆的相互作用  

Synthesis of Polyurethane Modified Polycarboxylate and Its Interaction withCement Paste

作　　者：向顺成 郑廷祥 高英力[1] 史威 蒋震 何彦琪 曾维 XIANG Shuncheng;ZHENG Tingxiang;GAO Yingli;SHI Wei;JIANG Zhen;HE Yanqi;ZENG Wei(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410082,China;Hunan Provincial Science and Technology Affairs Center,Changsha 410082,China;China West Construction Group Co.,Ltd.Hunan Branch,Changsha 410082,China)

机构地区：[1]长沙理工大学交通运输工程学院,长沙410082 [2]湖南省科学技术事务中心,长沙410082 [3]中建西部建设湖南有限公司,长沙410082

出　　处：《材料导报》2024年第21期292-298,共7页Materials Reports

基　　金：国家自然科学基金(52209154;52278239);湖南省“三尖”创新人才工程-“荷尖”人才项目(2022RC1175);教育部“春晖计划”合作科研项目(HZKY20220358);湖南省科技厅重点研发计划项目(2021SK2044);湖南省自然科学基金(2022JJ30042;2023JJ30040);湖南省研究生创新项目(CX20220869)。

摘　　要：通过正交实验设计获得了最佳制备工艺,采用自由基聚合方式合成了主链聚合度基本相同、侧链长度和官能团不同的梳状聚羧酸盐(M-PCE和O-PCE),将其与两种商用聚羧酸盐(C-PCE-1和C-PCE-2)进行比较,通过分析不同聚羧酸盐与硅酸盐水泥的吸附行为、流动性、Zeta电位和液面表面张力,探究了聚氨酯改性聚羧酸盐(M-PCE)与水泥净浆的相互作用关系。结果表明,由于硅氧烷基团的水解不完全,M-PCE促进了水泥基材料中水泥的水化作用;其他三种聚羧酸盐(O-PCE、C-PCE-1和C-PCE-2)由于其链烷基的屏蔽效应而延迟水化;同时,附带硅氧烷基团的M-PCE具有较高的Zeta电位绝对值,使水泥混凝土具有优异的表面张力和流动性,即聚氨酯侧链的接入对聚羧酸在水泥净浆中的各项性能有显著的积极影响。The optimum preparation process was obtained by orthogonal experimental design.Comb-like polycarboxylates(M-PCE and O-PCE)with the same degree of polymerization of main chain and different side chain length and functional groups were synthesized by free radical polymerization.They were compared with two commercial polycarboxylates(C-PCE-1 and C-PCE-2).The adsorption behavior,fluidity,Zeta potential and surface tension of different polycarboxylates and Portland cement were analyzed,the interaction between polyurethane modified polycarboxylate(M-PCE)and cement paste was investigated.The results show that due to the incomplete hydrolysis of the siloxane group,the role of M-PCE in cement-based materials can promote cement hydration,and the other three polycarboxylates(O-PCE,C-PCE-1 and C-PCE-2)can delay the hydration due to the shielding effect of their chain alkyl.At the same time,it is found that M-PCE with siloxane group has a high Zeta potential absolute value,which can make cement concrete have excellent surface tension and fluidity,that is,the access of polyurethane side chain has a significant positive impact on the performance of polycarboxylic acid in cement paste.

关 键 词：聚羧酸减水剂 聚氨酯改性 水泥净浆 

分 类 号：TQ172[化学工程—水泥工业]