摘要
与传统减水剂相比,聚羧酸减水剂具有减水率和净浆流动度高及坍落度损失小等特性。基于分子结构设计理论和自由基聚合理论,以两种不同分子量的甲代烯丙基聚乙二醇(TPEG)为大单体,马来酸酐(MAn)、甲基丙烯磺酸钠(MAS)、丙烯酰胺(AM)等为小单体,在引发剂过硫酸铵(APS)的作用下多元共聚合成聚羧酸减水剂。系统地研究了反应温度,反应时间,引发剂和单体用量对减水剂净浆流动度、减水率、坍落度等性能的影响,并探讨了聚羧酸减水剂结构与性能之间的关系。结果表明:与普通聚醚类减水剂相比,该聚羧酸高效减水剂具有较高的净浆流动度、减水率、强度等。当减水剂掺量为0.5%时,其净浆流动度达到315mm,而减水率可达35%。
Compared with the traditional water reducer, polycarboxylic superplasticizers exhibit the advantages of high water-reducing rate, cement paste fluidity and low slump loss, etc. On the basis of molecular structure design theory and free-radical polymerization theory, the polycarboxylic-type superplastics （PC） with methallyl polyoxyethylene ethers （TPEG） of two different molecular weights as the macromonomers, and maleic anhydride （MAn）, sodium methallyl sul fonate （MAS）, acrylamide （AM） as the micromonomers, were synthesized through multivariate copolymerization under the action of initiator, ammonium persulfate （APS）. The influence of reaction temperature, reaction time, initiator dos age and monomer dosage on the water reducing rate, cement paste fluidity and slump loss of water reducer were investi gated systematically. The relationship between structure and properties of polycarboxylate-type superplasticizers were ex plored. The results showed that the polycarboxylate-type superplasticizer is better than other ordinary water reducer. The paste flow can attain 315 mm and water reducing rate was 35% by using 0.5% of the product.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2012年第11期26-31,共6页
Journal of Wuhan University of Technology
关键词
聚羧酸高效减水剂
甲代烯丙基聚乙二醇
净浆流动度
减水率
polycarboxylate-type superplasticizer
methallyl polyoxyethylene ether
cement paste fluidity
water-reducing rate
