酰胺基改性聚羧酸减水剂性能研究

Study on the properties of amide modified polycarboxylate water reducing agent

将丙烯酰胺,甲基烯丙基聚氧乙烯醚,丙烯酸利用水溶液自由基聚合法合成酰胺基改性聚羧酸减水剂,并与未改性聚羧酸减水剂的对比。结果表明:酰胺基的引入降低了聚羧酸减水剂中的羧基密度,因此降低水泥浆体初始流动度;而酰胺基在碱性环境中的水解,可显著改善水泥基材料的经时流动度,同时有效提高水泥基材料的早期和后期强度。

The amide-modified polycarboxylate water-reducing agent was synthesized by free radical polymerization of acrylamide,methylallyl polyoxyethylene ether and acrylic acid with an aqueous solution and compared with an unmodified polycarboxylate water-reducing agent.The results show that the introduction of amide groups reduces the carboxyl group density in the polycarboxylate water reducing agent,thus reducing the initial fluidity of the cement slurry.The hydrolysis of the amide group in the alkaline environment can significantly improve fluidity retention,while effectively improving the early and late strength of cement-based materials.