摘要
以过硫酸铵(APS)为引发剂,N-氨基甲酰马来酸(NCMA)、聚乙二醇单烯丙基醚(APEG)和甲基丙烯磺酸钠(SMAS)为聚合单体,合成N-氨基甲酰马来酸-甲基丙烯磺酸钠-聚乙二醇单烯丙基醚(SP)。通过FTIR和1H NMR谱图对SP结构进行表征。以净浆流动度为指标,考察了引发剂用量、反应温度、SMAS/APEG摩尔比和NCMA/APEG摩尔比对净浆流动度的影响,并以净浆流动度、Zeta电位和吸附量为指标,探讨了酰胺型聚羧酸系减水剂与水泥的作用机理。试验结果表明,最佳反应条件为SMAS/APEG摩尔比1.2,NCMA/APEG摩尔比1.0,引发剂用量0.4%(质量分数)和反应温度为50℃;其分散机理主要是由于减水剂分子中的阴阳离子基团与水泥颗粒表面形成物理吸附,使水泥颗粒之间产生了立体斥力而产生分散作用。
Polycarboxylate based superplasticizer （SP） was prepared from N-carbamoylmaleamic acid （NCMA）, sodium methylallyl sulfonate （SMAS） and polyethylene glycol monoallyl ether （APEG） with ammonium persulphate （APS） as initiator. The molecular structure of SP was characterized by FTIR and 1H NMR. Effects of SMAS/APEG monomer mole ratio, NCMA/APEG monomer mole ratio, the degree of initiator and polymerization temperature were investigated with initial fluidity as measurement index. In or- der to study its action mechanism, the effect of SMAS/NCMA monomer mole ratio was investigated with initial fluidity, Zeta potential and adsorption as measurement index. The result shows that the optimal con- dition were as follows： the monomer mole ratio of SMAS/APEG is 1.2, the monomer mole ratio of NCMA/ APEG is 1.0, the amount of initiator is 0.4% according to the mass and the reaction temperature is 50℃. In addition,it was suggested that the mechanism of the SP force from the physical adsorption between the cationic groups and cement particles. was mainly owing to the steric repulsive anionic groups of SP and the surface of
出处
《应用化工》
CAS
CSCD
北大核心
2015年第6期1029-1032,1036,共5页
Applied Chemical Industry
基金
辽宁省博士科研启动基金(20131084)
