摘要
以乙烯基乙二醇醚聚氧乙烯醚(EPEG-3000)、丙烯酸、功能单体作为主要原材料,巯基丙酸(MPA)为链转移剂,经氧化还原体系引发剂引发,常温条件下(8~20℃)合成了一种既有较高减水率又对机制砂混凝土有较好适应性的聚羧酸减水剂。最佳合成工艺为:初始反应温度10~20℃,n(BA)∶n(AA)∶n(EPEG)=0.7∶3.8∶1.0,MPA掺量为EPEG质量的0.45%。按此工艺合成的聚羧酸减水剂PCA-850在相同掺量下比低温工艺条件下合成的减水剂PCA-810具有更好的坍落度保持性及和易性,且操作温度范围更宽,生产操作性强。
A polycarboxylate superplasticizer with high water-reducing rate and good adaptability to machine-made sand con-crete was synthesized at normal temperature(8~20 ℃) initiated by redox system initiator using ethylene glycol ether polyoxyethylene ether(EPEG-3000),acrylic acid and functional monomers as main raw materials,mercaptopropionic acid(MPA) as chain transfer agent. The optimum synthesis process is as follows:initial reaction temperature 10~20 ℃,n(BA)∶n(AA)∶n(EPEG)=0.7∶3.8∶1.0,and the content of MPA is 0.45% of the mass of EPEG. The polycarboxylate superplasticizer PCA-850 synthesized by this process has bet-ter slump retention and workability than the water-reducing agent PCA-810 synthesized under low temperature process conditions at the same dosage,and has wider operating temperature range and strong production operability.
作者
张朝辉
王文军
祝顺
濮熊熊
ZHANG Zhaohui;WANG Wenjun;ZHU Shun;PU Xiongxiong(Jiangsu Nigao Technology Co.Ltd.,Changzhou 213023,China)
出处
《新型建筑材料》
2023年第2期66-68,共3页
New Building Materials
关键词
EPEG-3000
聚羧酸减水剂
机制砂
常温合成
EPEG-3000
polycarboxylate superplasticizer
machine-made sand
synthesis at room temperature
作者简介
张朝辉,男,1982年生,高级工程师,主要从事新型绿色建筑功能材料的开发与研究,E-mail:zhangchaohui@czjky.wecom.work。
