酸醚比对聚羧酸系减水剂组成与性能的影响研究  

Influence of acid/ether-ratio on composition and dispersive property of polycarboxylic type water reducers

作　　者：李崇智[1] 刘骏超[1] 王琴[1] 周永辉 王昌祥 

机构地区：[1]北京建筑大学北京高等学校"工程结构与新材料"研究中心,北京100044 [2]上饶市天佳新型材料有限公司技术中心,江西上饶334100

出　　处：《新型建筑材料》2013年第12期80-83,87,共5页New Building Materials

基　　金：北京自然科学基金资助项目(2112012);北京教育委员会基金资助项目(KM201210016009);北京市属高校创新团队建设与教师职业发展计划项目(IDHT20130512)

摘　　要：将丙烯酸与甲基烯丙基聚乙二醇2400以不同的酸醚摩尔比合成聚羧酸系减水剂,采用凝胶色谱GPC方法和水泥净浆流动度方法分析反应体系的醚酸比对聚羧酸系减水剂聚合物组成与分散性能的影响。GPC分析结果表明,酸醚比增加,聚合物的平均分子质量及多分散性增大,但聚合度达到一定值后不再无限增加,大单体消耗完后过量的小单体则自聚成小单体聚合物,当酸醚摩尔比达到5∶1时,合成的减水剂溶液最终产物中聚合物减水剂约占92%,未反应大单体约占6%,小单体聚合物约占2%。酸醚比影响聚羧酸系减水剂对不同水泥的分散性能,当酸醚比达到3.5∶1.0时,对水泥的分散与分散保持能力较好。Polycarboxylic type water reducers were synthesized at different molar ratios of acrylic acid to methyl-allyl polyethylene, glycol 2400 （acid/ether-ratio）. Influence of the acid/ether ratio on its composition and dispersive property were studied by means of Gel Permeation in Chromatography （GPC） and fluidity test of cement paste. The GPC analysis results show that the average molecular weight and polydispersity were increased with the increase of acid/ether-ratio,but the polymerization degree should be no longer increased as which reached to a certain value,the excessive small-monomers would be self-polymerizcd when had been consumed. As the final product of polymer at an acid/ether ratio of 5：1 ,was composed of un-reacting （about 6%） and the copolymer of water reducers （about 92%） and the copolymer of small monomers （about 2%）. The result of fluidity of cement paste show that the acid/ether-ratio also influenced the dispersive property to different cement,The property of dispersive and fluidity retaining should be all well if st 3.5：1.

关 键 词：凝胶色谱法分析 酸醚比 聚羧酸系减水剂 聚合物组成 分散性能 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]