摘要
以聚乙二醇和甲基丙烯酸为原料,在催化剂作用下,通过酯化合成出甲基丙烯酸聚乙二醇单酯,通过正交试验得到制备大单体的最佳反应条件。并以甲基丙烯酸、甲基丙烯磺酸钠和自制大单体为主要原料合成聚羧酸减水剂,通过正交试验确定了最佳反应条件:在单体摩尔比n(MAA)∶n(MPEGMAA)∶n(SMAS)=3∶1∶1,引发剂用量为7.0%,反应温度为75℃,反应物浓度为25%,反应时间为3.0h的条件下,所得产品可使水泥净浆的流动度达到296mm。产品经红外光谱分析,证明为目标产物。
Polyethylene glycol acrylate was prepared by esterification of polyethylene glycol and methacrylic acid.The optimal conditions of esterification were studied by orthogonal tests.Polycarboxylate superplasticizer was synthesized by condensation of methyl acrylate,sodium methacrylate and the made macromonomer.The results showed that when the monomer ratio was 3∶1∶1,the amount of initiator was 7%,the reaction temperature was 75℃,the reactant concentration was 25%,and the reaction time was 3.0 h,the fluidity of cement paste reached 296 mm.The structure of the products was characterized by FT IR.
出处
《化学世界》
CAS
CSCD
北大核心
2013年第1期39-42,共4页
Chemical World
关键词
聚羧酸系减水剂
合成
流动度
正交试验
polycarboxylate superplasticizer
synthesis
fluidity
orthogonal test
