摘要
采用自由基共聚法,将大单体聚乙二醇单甲醚甲基丙烯酸酯(MPA)、木质素磺酸钠(LS)、丙烯酸(AA)和甲基丙烯磺酸钠(MAS)4种单体进行共聚,合成木质素磺酸盐改性聚羧酸减水剂。在n(AA)∶n(MPA)∶n(MAS)=5.0∶1.0∶1.0,引发剂用量为2.5%,LS用量为9%,反应温度80℃和反应时间为5 h的条件下合成的减水剂,掺量为0.2%、水灰比为0.29时,掺减水剂水泥净浆初始流动度达290 mm、30 min经时流动度为285 mm,流动度保持性良好。减水剂PC-LS掺量为0.4%时,砂浆的减水率达30%。
By free radical copolymerization,the lignosulfonate based superplasticizer was synthesized by macromer MPA （methoxy polyethylene glycol methacrylate）, LS （lignosulfonate）, acrylic acid （AA） and sodium methylallyl sulfonate （MAS）.The results show that maintaining the AA,MPA,MAS molar ratio of 5.0：1.0：1.0, initiator of the mass fraction of 2.5%,LS mass fraction of 9%, reaction temperature of 80 ℃ and reaction time of 5 h,in the solid content of 0.2%,water-cement ratio of 0.29,the initial paste fluidity reaches 290 mm and it reaches 285 mm after 30 min. The fluidity retentivity is good. When the PC-LS content in the superplasticizer is 0.4%,the water-reducing rate of the mortar is 30%.
出处
《新型建筑材料》
2012年第1期58-61,共4页
New Building Materials
关键词
聚羧酸减水剂
木质素磺酸钠
改性
polyearboxylie acid type superplastieizer
sodium lignosulfonate
modified
