一种新型保坍型聚羧酸减水剂的合成及其应用性能研究

Synthesis and application of a new slump retarding polycarboxylate superplasticizer

以甲基烯丙基聚氧乙烯醚(TPEG)、丙烯酸(AA)和聚甘油丙烯酸酯(PA)为共聚单体,在维生素C(V_C)、过氧化氢(H_2O_2)和链转移剂巯基乙酸(TGA)作用下,合成了新型保坍型聚羧酸减水剂HS-JG,利用凝胶色谱和红外光谱对产物的结构进行表征,并对其应用性能进行研究。结果表明,在n(AA)∶n(PA)∶n(TPEG)=2∶0.15∶1,V_C、H_2O_2和TGA用量分别为TPEG质量的0.5%,1.4%和0.5%,反应温度50℃,反应时间3 h的条件下合成的HS-JG对水泥有较好的适应性,对水泥净浆以及混凝土坍落度有较好的保持能力。

Taking polyoxyethylene allyl methyl ether （TPEG）, acrylic acid （AA） and polyglycerol acrylate （PA） as comonomer, under the action of vitamin C （ Vc ）, hydrogen peroxide （ H2O2 ） and chain transfer agent thioglyeolic acid （ TGA）, a new slump retarding superplasticizer HS - JG was synthesized. The structure of the product was characterized by using gel chromatography and infrared spectrum, and the study on its application performance was carried out. Results show that when n（AA）： n（PA） ： n（TPEG） = 2： 0. 15： 1, the content of Vc ,H2O2 and TGA is 0.5% ,1.4% and 0. 5% of the mass of TPEG respectively,the reaction temperature is 50 ℃, and the reaction time is 3 h, the synthesized product HS -JG has good adaptability to cement. The slump retarding property is better in ability to maintain for cement paste and concrete.