新型缓释型聚羧酸减水剂的合成及性能研究

Study on synthesis and performance of a novel slow release polycarboxylic superplasticizer

以甲基烯丙基聚氧乙烯醚(TPEG)、丙烯酸羟乙酯(HEA)、丙烯酸(AA)、钙离子螯合单体(GMA-IDA)等为合成主要原料,经自由基聚合制备了新型缓释型聚羧酸减水剂(RPE)。采用红外光谱对合成减水剂的分子结构进行表征,对合成产品进行了水泥净浆经时流动度测试,结果表明,TPEG、HEA、AA和GMA-IDA聚合顺利进行,合成产物为目标产物;当GMA-IDA替代TPEG质量的10%时,RPE的分散性及分散保持性显著提高,表现出缓释性能和较好的保坍性。

A new slow-releasing polycarboxylic superplasticizer （RPE） was synthesized by radical copolymerization with polyoxyethylene allyl methyl ether （TPEG）,2-hydroxyethyl acrylate （HEA）,acrylic acid （AA）,calcium ion chelating monomer （GMA-IDA） as the main synthesis raw materials. Molecular structure of RPE was characterized by Fourier transform infrared spectrum （FT-IR）. The cement paste fluidity over time were studied. The results showed that the copolymerization reaction of TPEG, HEA,AA and GMA-IDA was carried out successfully,the product was target product. When the GMA-IDA replace 10% of TPEG weight,the dispersion and slump-retention-ability of RPE will be significantly improved. RPE exhibits a good slow-release function and a greater slump retaining property.