摘要
以丙烯酸甲酯(MA)、甲基丙烯磺酸钠(SMS)、甲基丙烯酸(MMa)、聚乙二醇单甲醚丙烯酸酯(P23MM)为原料,过硫酸铵(APS)为引发剂,进行水溶液自由基共聚,合成聚羧酸系水泥减水剂。以初始净浆流动度为考察指标,通过正交和单因素实验,确定合成聚羧酸系水泥减水剂的最佳工艺条件:APS用量为0.9%,n(P23MM)∶n(SMS)∶n(MA)∶n(MM a)=20∶8∶15∶47,反应温度80℃,反应时间8 h。合成的聚羧酸系水泥减水剂在低掺量(0.6%)、低水灰比(W/C=0.3)时,初始净浆流动度可达253 mm,2 h后净浆流动度仍有248 mm;减水剂水溶液(1%)的表面张力为53.88 mN/m,最优化条件下合成的减水剂水溶液为假塑性流体。
Polycarboxyhc water-reducing agent was synthesized with methyl acrylate, methylacrylamide sodium, methacrylate and polyethylene glycol monomethyl ether methylacrylate. Ammonium persulfate as the initiator was used for the radical aqueous solution polymerization. The formulation of the water-reducing agent [ APS,0.9 % ; n ( P23 MM) : n (SMS) : n (MA) : n (MMa) = 20 : 8 : 15 : 47 ] and optimized reaction conditions( RT = 80℃, RH = 8 h)were obtained via orthogonal test and single factor experiment. The initial fluidity of the cement paste containing the prepared water-reducing agent [ mix amount 0.6% ,w (water) :w (cement) = 0.3 ] was 253 mm and remained 248 mm after 2 h. The surface tension of the product solution( 1% ) was 53.88 mN/m. The water-reducing agent produced on optimum conditions is pseudo plastic.
出处
《应用化工》
CAS
CSCD
2008年第8期847-850,872,共5页
Applied Chemical Industry
基金
教育部跨世纪优秀人才基金(NCET-05-0487)
关键词
水泥
减水剂
聚羧酸
聚乙二醇单甲醚甲基丙烯酸酯
净浆流动度
cement
water-reducing agent
polycarboxylic acid
polyethylene glycol monomethyl ethermethyl acrylate
fluidity