烯丙基聚乙二醇系聚羧酸类减水剂的研究

Study on Allyl Polyethylene Glycol Based Polycarboxylate Superplasticizer

采用一步合成法,以烯丙基聚乙二醇(APEG)、马来酸酐和丙烯酸甲酯为单体,在引发剂作用下,直接聚合制得烯丙基聚乙二醇系聚羧酸类减水剂.通过试验,研究了单体摩尔比、引发剂用量、聚合温度、聚合时间和滴加时间对聚合产物分散性和保塑性的影响规律.通过正交试验,得到了最佳合成工艺为:n(APEG)∶n(马来酸酐)∶n(丙烯酸甲酯)=7∶8∶7、引发剂用量为1.7%(摩尔分数)、聚合温度为80℃、反应时间为8 h、丙烯酸甲酯和引发剂溶液滴加时间均为1 h.与以聚乙二醇单甲醚(MPEG)和甲基丙烯酸为单体合成的产品进行性能对比后发现,烯丙基聚乙二醇系聚羧酸类减水剂是一种性价比较好的聚羧酸类减水剂.

One-step method was used to make new polycarboxylate superplasticizer. The superplasticizer was directly polymerized using allyl polyethylene glycols（APEG）, maleic anhydride and methyl acrylate as monomers and ammonium persulfate as initiator. The influence of monomer ratio, initiator dosage, reaction time, reaction temperature and dropping time on dispersing ability and fluidity-retaining ability of superplasticizer was studied. Based on the orthogoned experiment, the best process was obtained. The comparison was made on performance of the product synthesized and another widely used product at present which is synthesized by methoxy polyethylene glycol（MPEG） and methyl acrylic acid（MAA）. The results show that the former has letter performance price ratio.