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小坍落度保持型聚羧酸保坍剂的合成及性能研究

作者:张华,袁宵梅,茹晓红,王玉江,罗林豪

关键字:小坍,落度,保持型,聚,羧酸,保坍剂,的,合成,及,

 
(洛阳理工学院 材料科学与工程学院,河南 洛阳  471023)
摘要:以异戊烯醇聚氧乙烯醚(TPEG)、丙烯酸、丙烯酸羟丙酯为原料,根据自由基聚合原理,合成了小坍落度保持型聚羧酸保坍剂。其最佳合成工艺为:酸醚比1.8,酯醚比2.5,链转移剂巯基丙酸和还原剂维生素C用量分别为单体总质量的0.8%和0.45%,反应温度为25 ℃。并通过红外光谱和凝胶渗透色谱分析了该保坍剂的分子结构,同时验证了其在新拌混凝土中的应用效果。
关键词:聚羧酸减水剂;小坍落度混凝土;保坍剂
中图分类号:TU528.042+.2        文献标识码:A        文章编号:1001-702X(2019)04-0121-03
 
Study on the synthesis and properties of low collapse polycarboxylate slump-loss resistance agent
ZHANG Hua,YUAN Xiaomei,RU Xiaohong,WANG Yujiang,LU Linhao
(School of Materials Science and Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,China)
Abstracts:Low collapse polycarboxylate slump-loss resistance agent were synthesized utilizing Isoamyl enol polyoxyethylene ether,acrylic acid,hydroxypropylacrylate as raw materials based on the reaction theory of free radical copolymerization. The best synthesis process is as follows:the ratio of acid to ether is 1.8,the ratio of ester to ether is 2.5,the amount of chain transfer agent Mercaptopropionic Acid is 0.8% of the total mass of monomer,the reaction temperature is 25 ℃,and the amount of reducing agent Vitamin C is 0.45% of the total mass of monomer. The molecular structure of the low collapse polycarboxylate slump-loss resistance agent was characterized by Fourier transform infrared spectrometer and gel permeation chromatography,and its application effect in the new mixed concrete was verified.
Key words:polycarboxylate superplasticizer,low-slump concrete,slump loss resistant agent
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