摘要
以三聚氰胺(M)和甲醛(F)为原料、亚硫酸氢钠(SB)为磺化剂,采用四步法合成了三聚氰胺高效减水剂,并着重探讨了不同因素对该减水剂分散性能的影响。研究结果表明:采用单因素试验法优选出制备该减水剂的最佳工艺条件是n(M)∶n(F)∶n(SB)=1∶6∶1.3,羟甲基化阶段的温度、时间和pH分别为70℃、1.5 h和8.5,磺化阶段的温度、时间和pH分别为80℃、3.0 h和12,酸性缩聚阶段的温度、时间和pH分别为60℃、1 h和4,碱性重整阶段的温度、时间和pH分别为80℃、1 h和8.5;此时,该减水剂的分散性能相对最好,当w(减水剂)=1.0%(相对于水泥质量而言)时,水泥净浆的初始流动度(267 mm)相对最大。
With melamine (M) and fimnahlehwle (F) as raw materials, sodium bisulfile (SB) as sulfonating agent,a melamine effivient superplastieizer was synthesized by four steps niethod,and the inlluenees of different [hclors on the dispersion properly of superplasticizer were eniphatieally discussed. The research results showed lilal lhe opliinal tlroeess conditions of preparing SUllerplaslieizer were preferred by single-laelor exllerimenl when mollar ratio of ll ( M ):It ( P ):It (SIS) was 1:6:1.3, the ienlperalure, lime and pH were 70 ℃, 1.5 h alid 8.5 respectively st hydroxyl nielhylalioll slage,80 ℃,3 h and 12 respeclively al su]foualed stage,60 ℃, 1 h and 4 respeelively at avidie llol.s'condellsalion slage,and 80 ℃ ,1 h and 8.5 respeclively al alkaline reforming stage. Here,lhe superlllaslivizer had Ihe relalivelv best dispersion prolwrly because the inilial eelnenl paste fluidity(267 ram) wax relalively maxinlal when mass fraction of superphislicizer was 1.0% in cemenl.
出处
《中国胶粘剂》
CAS
北大核心
2013年第12期9-12,共4页
China Adhesives
基金
常熟理工学院2013年大学生实践创新训练计划项目
关键词
减水剂
三聚氰胺
亚硫酸氢钠
磺化
水泥净浆流动度
superplasticizer
melamine
sodium bisulfile (SB)
sulhmaled
cemenl pasle fluidity