聚醚接枝聚羧酸系高效减水剂的合成  

Synthesis of Polyether-grafted Polycarboxylate-based Superplasticizer with High Performances

作　　者：韩武军[1] 郑广军[1] 韩周冰[1] 周辉[1] 袁明华[1] 李康林[1] 

机构地区：[1]中建商品混凝土有限公司,武汉430205

出　　处：《精细石油化工进展》2013年第1期34-37,共4页Advances in Fine Petrochemicals

摘　　要：采用一步合成法,以异戊烯醇聚氧乙烯醚(TPEG)、烯丙醇聚氧乙烯醚(APEG)、功能性单体(酯化物)和丙烯酸(AA)为单体,在引发剂过硫酸铵和链转移剂巯基乙酸作用下,直接聚合制得聚羧酸系改性聚醚类减水剂,探讨了大单体配比、引发剂用量、链转移剂用量、滴定时间和聚合温度对聚合产物分散性的影响。得出制备高效减水剂适宜的工艺条件如下:丙烯酸和功能性单体用量各为15.0 g,n(APEG)∶n(TPEG)=2∶1,引发剂用量和链转移剂用量(以大单体质量计)分别为0.9%和0.8%,滴定时间为3.5 h,聚合温度为60℃,合成的聚羧酸系减水剂掺量为0.16%时,净浆流动度可达285 mm,说明合成的聚羧酸减水剂具有很好的分散性。Polycarboxylate superplasticizer was synthesized by direct polymerization from TPEG,APEG,a functional monomer(a kind of ester),and AA as monomers in the presence of APS as initiator and TGA as chain transfer agent through one pot synthesis.The effects on reaction conditions such as mass ratio of big monomers,amount of the initiator,chain-transfer agent,titration time and reaction temperature on dispersion and fluidity-retaining ability were examined.The suitable conditions for synthesizing superplasticizer with high performance were determined as follows: the amounts of AA and functional monomer were both 15.0 g,ratio of APEG to TPEG 2:1,the contents of initiator and chain-transfer agent were 0.9% and 0.8% respectively,titration time 3.5 hours,polymerization temperature 60 ℃.The synthesized polycarboxylate superplasticizer had excellant dispersion with the fluidity of cement paste up to 285 mm when blending 0.16% superplasticizer.

关 键 词：聚羧酸类减水剂 分散性 坍落度损失 水泥净浆流动度 减水率 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]