MAPEG-MA-SMAS三元共聚物高效减水剂的制备及性能研究  

Preparation and performance of polycarboxylate terpolymer superplasticizer MAPEG-MA-SMAS

作　　者：张昌辉[1] 李林东[1] 杜双[1] 吕生华[1] 

机构地区：[1]陕西科技大学教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《现代化工》2013年第3期62-65,共4页Modern Chemical Industry

基　　金：国家自然科学基金资助项目(21076121)

摘　　要：以马来酸聚乙二醇单酯(MAPEG)、丙酸甲酯(MA)和甲基烯丙基磺酸钠(SMAS)为原料,通过共聚反应制得MAPEG-MA-SMAS三元共聚物高效减水剂。讨论了共聚反应中影响合成减水剂性能的因素,并用GPC表征了减水剂的相对分子质量及其分布。通过SEM分析了水泥石的微观结构。结果显示,当n(MAPEG)∶n(MA)∶n(SMAS)=1.0∶0.5∶0.5,聚合反应温度为85℃,聚合反应时间为7 h,引发剂用量为单体总质量的3.6%,合成的减水剂综合性能良好。当其掺量为0.3%时,水泥净浆初始流动度达325 mm。GPC分析显示减水剂平均相对分子质量Mw=15 345,分散系数Mw/Mn=2.087。SEM分析结果显示减水剂使水泥石大孔率降低,晶形更完整。The polycarboxylate terpolymer superplasticizer MAPEG-MA-SMAS is prepared by copolymerization of esterification intermediate （ MAPEG）, methyl acrylate （ MA ） and sodium methallyl sulfonate （ SMAS ）. The effect of copolymerization reaction on the performance of superplasticizer is studied. Relative molecule weight and its distribution of superplasticizer are measured by GPC. The microstructure of cement is characterized by SEM. The results show that the superplasticizer with good performance can be obtained under the following conditions ： 1.0 ： 0. 5 ： 0. 5 molar ratio of MAPEG, MA and SMAS, 85℃of the polymerization reaction temperature, 7 h of the polymerization reaction time and 3.6% （based on total monomer mass） of the dosage of initiator. The initial fluidity of cement paste can reach 325 mm with 0. 3% of the superplasticizer. GPC result shows that the mean molecular weight （Mw ） and polydispersity （MJM,） of the superplasticizer are 15 345 and 2. 087, respectively. SEM result shows the amount of macropors of cement are reduced by adding the suoerolasticizer, and the crystals a＇row more Deflect.

关 键 词：高效减水剂 净浆流动度 三元共聚物 马来酸酐 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]