聚醚单体GPEG合成保坍型聚羧酸减水剂及其性能研究  

Synthesis and research on the properties of slump-preserving type polycarboxylate superplasticizer with polyether monomer GPEG

作　　者：孙友 曾珣 敖凡 龙潇 刘星 SUN You;ZENG Xun;AO Fan;LONG Xiao;LIU Xing(Guizhou Dr.Stone Technology Co.Ltd.,Guiyang 550014,China)

机构地区：[1]贵州石博士科技股份有限公司,贵州贵阳550014

出　　处：《新型建筑材料》2022年第3期127-130,135,共5页New Building Materials

摘　　要：采用大单体乙二醇单乙烯基聚乙烯醇醚(GPEG)、丙烯酸、丙烯酸羟乙酯、双氧水(H2O2)/E51氧化还原体系及分子质量调节剂巯基丙酸(MPA),通过自由基聚合反应,制备保坍型聚羧酸减水剂(GPEG-PCE),并探讨原材料比例及制备工艺对其性能的影响。试验结果表明:GPEG-PCE的最佳反应工艺参数为:反应温度20℃,酸醚比1.6,酯醚比3.6,H2O2、MPA用量分别为大单体质量的0.63%、0.40%,反应时间1 h;所合成GPEG-PCE的分散性和分散保持性优于由HPEG/TPEG聚醚单体合成的保坍型聚羧酸减水剂,将其与普通型聚羧酸减水剂按照一定比例复配应用于混凝土中,能使混凝土坍落度在3 h内略有增大。In this paper,slump-preserving polycarboxylate superplasticizer(GPEG-PCE) was synthesized by free radical copoly merization reaction by ethylene glycol monovinyl polyethylene glycol ether(GPEG),acrylic acid,hydroxyethyl acrylate,and the redox system is hydrogen peroxide/E51 and molecular mass regulator mercappropylic acid(MPA).Discuss the effect of raw material ratio and synthesis process on its performance.The test results showed that the best reaction process parameters of GPEG-PCE are:the initial temperature is 20 ℃,the ratio of acid to ether is 1.6,the ratio of ester to ether is 3.6,and the amount of initiator(H2O2)and molecular weight regulator(MPA) are 0.40% and 0.63% of macromonomer,respectively.The reaction time is 1 h.The synthesized GPEG-PCE has better dispersibility and slump retention than the slump-retaining polycarboxylate superplasticizer synthesized by HPEG/TPEG polyether monomer.GPEG-PCE and ordinary polycarboxylate superplasticizer are compounded and applied to con-crete in a certain proportion,which can make the concrete slumps slightly increased within 3 h.

关 键 词：GPEG 氧化还原体系 自由基聚合 保坍型聚羧酸减水剂 分散性 分散保持性 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]