本体聚合法制备保塑-减缩型聚羧酸系减水剂

Study on Synthesis of Slumpmaintaining and Shrinkagereducing Type Polycarboxylate Superplasticizer Utilizing the Method of Bulk Polymerization

摘要:

以丙烯醇聚氧乙烯醚（APEG）和二乙二醇单丁醚单马来酸酯（MADGBE）为原料，在本体聚合条件下合成聚羧酸系减水剂(PCE).研究了单体摩尔比、聚合温度以及引发剂的投料方式对产物性能的影响.试验结果表明，当MADGBE与APEG的摩尔比为3.5∶1，聚合温度为90 ℃，引发剂均分三份后分批加入所制备的聚羧酸系减水剂具有良好的混凝土坍落度保持性，且显著降低了混凝土的收缩率，但在一定程度上延长了混凝土的凝结时间.最后，利用红外光谱对产物分子结构进行表征，结果表明所得产物分子结构与预期相符.

Abstract:

In this paper, the polycarboxylate superplasticizers (PCE) were synthesized with allyl polyethylene glycol (APEG) and maleic anhydride diethylene glycol butyl ether monoester (MADGBE) as main raw materials using the method of bulk polymerization. And the influence of the ratio of monomer, the polymerization temperature and the mode of adding polymerization initiator on the performance of polycarboxylate superplasticizers were investigated. The results showed that the synthesized PCE, under the optimum polymerization conditions: the ratio of MADGBE and APEG is 3.5∶1, the polymerization temperature is 90 ℃ and the polymerization initiator is added in three times equally, performs excellent slumpmaintaining and shrinkagereducing. But the PCE extended the setting time of concrete. At the last, the molecular structure of the PCE was characterized using Fourier transform infrared spectromet (FTIR) analysis.