新型磷酸基缓凝剂的合成与性能评价  

Preparation and Properties of Phosphate Retarders for Concrete

作　　者：张堃宇 韩正 闫晶晶 黄振 夏正奕 ZHANG Kun-yu;HAN Zheng;YAN Jing-jing;HUANG Zhen;XIA Zheng-yi(Jiangsu Sobute New Materials Co.,Ltd.,Jiangsu Nanjing 211103,China)

机构地区：[1]江苏苏博特新材料股份有限公司,江苏南京211103

出　　处：《广州化工》2024年第18期33-35,58,共4页GuangZhou Chemical Industry

基　　金：国家自然科学基金青年基金(52102022);江宁区关键核心技术攻关“揭榜挂帅”项目(2023JBGS009)。

摘　　要：以缩水甘油、乙二胺为原料,经反应合成得到了一种新型的磷酸基缓凝剂(GEP),通过对反应条件的优化确定了最优的合成条件:乙二胺和缩水甘油摩尔比为1∶1.25,硫酸、亚磷酸、甲醛的摩尔量与体系内剩余胺基氢摩尔量之比为1∶1.1∶1.2∶1,反应温度为120℃、反应时长为10 h。与市售缓凝剂HEDP和EDTMPS进行了净浆中性能的对比分析、水化热及混凝土性能测试发现,样品符合国标要求,缓凝能力EDTMPS>GEP>HEDP,GEP样品水化热出峰靠后但放热量高,可能是造成其在净浆中初始流动性好,而缓凝效果稍差于EDTMPS的原因。A new phosphoric acid-based retarder(GEP)was synthesized with the raw materials of glycidyl and ethanediamine.And the optimum synthesis conditions were determined by optimizing.The molar ratio of ethanediamine and glycidyl was 1∶1.25.While sulfuric acid,phosphorous acid,formaldehyde to the residual amino hydrogens was 1∶1.1∶1.2∶1.The reaction temperature was 120℃,and the reaction time was 10 h.The hydration heat test and the concrete performance test were used to determine the excellent performance of the synthesized retarder comparing with the HEDP and EDTMPS.It was found that all the samples conformed to the national standard,the retarding capacity was EDTMPS>GEP>HEDP.The delayed peak of GEP samples but high heat release may be the reason that the initial fluidity of GEP sample was better than that of EDTMPS,but the retarding effect was slightly worse.

关 键 词：缩水甘油 乙二胺 亚磷酸 缓凝剂 凝结时间 

分 类 号：TQ172.46[化学工程—水泥工业]