高效降粘型和消泡型聚羧酸减水剂的合成及性能

HIGH EFFICIENCY VISCOSITY REDUCING AND DEFOAMING POLYCARBOXYLIC ACIDS SYNTHESIS AND PROPERTIES OF WATER REDUCING AGENT

采用低温自由基聚合的方法,分别制备了新型降粘型、消泡型聚羧酸减水剂。通过IR测试得到降粘型和消泡型聚羧酸减水剂均成功聚合;降粘型聚羧酸减水剂配制水泥混凝土的倒置坍落度桶排空时间为14 s;消泡型聚羧酸减水剂配制水泥混凝土的含气量仅为0.6%,且结合SEM图证明了其28 d测得的74.5 MPa高抗压强度。不同功能型聚羧减水剂适用于不同施工工艺的实际工程,具有良好的应用前景。

In this paper,new viscosity reducing and defoaming polycarboxylic acid water reducing agents were prepared by low-temperature free radical polymerization.The viscosity reducing and defoaming polycarboxylic acid water reducing agents were successfully polymerized by IR test;the emptying time of inverted slump bucket of cement concrete prepared with viscosity reducing polycarboxylic acid water reducer is 14 s;the air content of cement concrete prepared with defoaming polycarboxylic acid water reducer is only 0.6%,and the high compressive strength of 74.5 MPa measured in 28 days is proved by SEM.Different functional polycarboxylate water reducing agents are suitable for practical projects with different construction processes,and have good application prospects.