聚羧酸保坍剂的合成优化及性能研究

Synthesis optimization and performance study of polycarboxylate superplasticizer

以异戊烯基聚氧乙烯醚为起始原材料合成了一种聚羧酸保坍剂,通过单因素调整和正交试验优化,探究了不同投料量合成的聚羧酸保坍剂对净浆以及混凝土性能的影响。结果表明:适当增加丙烯酸羟乙酯用量能提高聚羧酸保坍剂对净浆的分散保持性;制备聚羧酸保坍剂的最佳配方为:过氧化氢、还原剂TP1351、丙烯酸、丙烯酸羟乙酯用量分别为2.35、0.20、10.33、33.97 g;按最佳配方制备的聚羧酸保坍剂PCE-5,可提高混凝土的保坍性,且对混凝土强度无影响。

A polycarboxylate slump retainer synthesized from isoprenyl polyoxyethylene ether(TPEG)as the starting raw material was used to explore the effects of polycarboxylic acid slump retaining agent synthesized with different dosages on the properties of slurry and concrete through single factor adjustment and orthogonal test.The results show that the slump retention of polycarboxylate can be improved by increasing the dosage of hydroxyethyl acrylate appropriately,the optimal formula for preparing polycarboxylate superplasticizer is that the dosage of hydrogen peroxide,reducing agent TP1351,acrylic acid,and hydroxyethyl acrylate are 2.35,0.20,10.33,and 33.97 g,respectively.The polycarboxylate superplasticizer PCE-5 prepared according to the optimal formula can improve the slump retention of concrete without affecting its strength.