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保坍型聚羧酸减水剂的合成及性能研究

作者:张和1,2,杨彩兰1,蒋喆3,李瑞1,李多金1,刘惠银1,2

关键字:保坍型,聚,羧酸,减,水剂,的,合成,及,性能,宁,

 
(1.宁夏新华轩高新技术有限公司,宁夏 青铜峡  751600;2.青铜峡市恒源砼业有限公司,宁夏 青铜峡  751600;3.宁夏建设工程质量安全总站,宁夏 银川  750000)
    摘要:采用异戊烯醇聚氧乙烯醚(TPEG)、丙烯酸(AA)、丙烯酸羟乙酯(HEA)、抗坏血酸(Vc)、巯基丙酸(MPA)等为主要原材料,经自由基聚合反应合成一种保坍型聚羧酸减水剂,并对其结构进行了表征。通过单因素试验,分别考察了酸醚比、酯醚比、链转移剂和还原剂用量、反应初始温度对合成减水剂分散性的影响,优化了合成工艺条件。试验结果表明,酸醚比为2.60、酯醚比为2.43、链转移剂和还原剂用量分别为大单体质量的0.44%和0.35%、反应初始温度为24 ℃时,合成的保坍型聚羧酸减水剂的分散性和分散保持性最佳,混凝土和易性与保坍性良好。
    关键词:保坍型;聚羧酸减水剂;自由基聚合;分散性
    中图分类号:TU528.042+.2        文献标识码:A        文章编号:1001-702X(2022)07-0118-04
 
Synthesis and performance evaluation of slump-retaining type polycarboxylate superplasticizer
ZHANG He1,2,YANG Cailan1,JIANG Zhe3,LI Rui1,LI Duojin1,LIU Huiyin1,2
(1.Ningxia Xinhua Xuan High-tech Co. Ltd.,Qingtongxia 751600,China;2.Qingtongxia Hengyuan Concrete Industry Co. Ltd.,Qingtongxia 751600,China;3.Ningxia Construction Project Quality and Safety Station,Yinchuan 750000,China)
    Abstract:A slump-retaining type polycarboxylate superplasticizer was synthesized by free radical polymerization using Isoamyl alcohol polyoxyethylene ether(TPEG),acrylic acid(AA),hydroxyl ethyl acrylate(HEA),ascorbic acid(Vc) and mercapto propionic acid(MPA) as the main raw materials,and its structure was characterized. The influences of acid-ether ratio,ester ether ratio,amount of chain transfer agent,amount of reducing agent and initial reaction temperature on dispersion properties by single factor variable method were investigated in order to optimize the reaction condition. The results showed that when the acid-ether ratio is 2.60,the ester ether ratio is 2.43,the amount of chain transfer agent is 0.44%(mass of large monomer),the amount of reducing agent is 0.35%(mass of large monomer),and the initial reaction temperature is 24 ℃,the dispersion and retention of slump-retaining type polycarboxylate superplasticizer is the best,and the workability and slump retention of concrete are good.
    Key words:slump-retaining type,polycarboxylate superplasticizer,free radical polymerization,dispersion performance