EPEG型两性聚羧酸减水剂的合成及性能研究

Study on synthesis and properties of EPEG type amphoteric polycarboxylate superplasticizer

将六碳高活性大单体乙二醇单乙烯基聚乙二醇醚(EPEG)与丙烯酸(AA)、丙烯酰氧乙基三甲基氯化铵(DAC)、对苯乙烯磺酸钠(SSS)进行四元自由基水溶液聚合反应,得到EPEG型两性聚羧酸减水剂(PCE-EADS),采用FTIR、^(1)H NMR对产物结构进行表征,通过水泥净浆流动度试验和混凝土性能试验测试了PCE-EADS对水泥的分散性。结果表明,PCE-EADS比普通EPEG型聚羧酸减水剂(PCE-EA)分散性更好,比市售聚羧酸减水剂(Point-S)分散性和保坍性要优,相同条件下掺量比Point-S掺量更少,且混凝土7、28 d抗压强度更高。

EPEG type amphoteric polycarboxylate superplasticizer PCE-EADS were synthesized by free radical aqueous solution polymerization reaction of a new type of macromonomer ethylene glycol monovinyl polyethylene glycol ether(EPEG),acrylic acid(AA),acryloyloxyethyl trimethyl ammonium chloride(DAC)and sodium p-styrenesulfonate(SSS)as macromonomer,and the structure of the target product was analyzed and characterized by FTIR and^(1)H NMR,the dispersion performance of water reducing agents on cement was tested through the flowability of cement slurry and concrete properties.The results show that PCE-EADS has better dispersion than ordinary EPEG type polycarboxylate superplasticizer.PCE-EADS has better dispersion and slump retaining properties than the commercial polycarboxylate superplasticizer product Point-S,and under the same conditions,the dosage is less than that of Point-S,and the compressive strength of concrete at 7 and 28 days is higher.