新型嵌段聚醚型减水剂的研制

Development of new unsaturated block polyether-type water reducing agent

通过设计合成减水剂所用的聚醚单体时加入环氧丙烷组分得到环氧乙烷环氧丙烷嵌段的多元聚醚体系,使憎水甲基远离水分子,保证添加减水剂的水泥浆体初始分散性,同时提高减水剂的保坍性。以新型不饱和嵌段聚醚OXAB-505和马来酸酐为主要聚合单体,通过水溶液自由基聚合合成一种高效减水剂。考察了嵌段聚醚分别与马来酸酐、醋酸乙烯酯、第四聚合单体摩尔比等因素对减水剂应用性能的影响,得出嵌段聚醚类减水剂最佳合成工艺为:聚醚与马来酸酐的摩尔比为1∶2,聚醚与醋酸乙烯酯的摩尔比为1∶3,AMPS与聚醚的摩尔比为1∶4。研究了各因素对减水剂应用性能的影响,嵌段聚醚的应用使减水剂显示出较好的功能性。

A multiple polyether system with blocks of ethylene oxide and propylene oxide is obtained through adding propylene oxide into a polyether monomer for synthesizing a water reducing agent,which keeps the hydrophobic methyl group away from water molecules,ensuring the initial dispersibility of the cement slurry added with the water reducing agent and improving the moisture retention of the water reducing agent.A novel efficient water reducing agent is synthesized via free radical polymerization in aqueous solution with the new unsaturated block polyether OXAB-505 and maleic anhydride as main monomers.The effects of the molar ratios of block polyether to maleic anhydride,vinyl acetate and the fourth monomer respectively on the application properties of the water reducing agent are investigated.The optimal synthesis process for the block polyether water reducing agent is as follows：the molar ratio of polyether to maleic anhydride is 1∶2,the molar ratio of polyether to vinyl acetate is 1∶3 and the molar ratio of AMPS to polyether is 1∶4.The influences of various factors on the application performance of the water reducing agent are studied.The applications of the block polyether help the water reducing agent show better functionality.