摘要
采用氧化还原引发体系，以异戊烯醇聚氧乙烯醚（TPEG）、丙烯酸（AA）和丙烯腈（AN）为单体，合成了氰基改性聚羧酸减水剂，其最佳合成条件为：n（AA）：n（TPEG）=4：1，n（氧化剂）：n（还原剂）=4：1，AN对AA的摩尔替代量为7％，巯基乙酸用量为单体总质量分数的0．4％，反应温度为45℃，巯基乙酸和还原剂混合溶液滴加时间为1．5h，保温时间为2h。相比于未改性的聚羧酸减水剂（PCA1），改性后的聚羧酸减水剂（PCA2）减水率提高2．2～4．6个百分点，硬化混凝土各龄期强度增长更好。
A cyano-modified polycarboxylate superplasticizer was synthesized in an oxidation-reduction initiator system with the monomers including isoamyl ethoxylate （TPEG）, acrylic acid （AA） and acrylonitrile （AN）. The optimum polymerization conditions for the preparation of cyano-modified polycarboxylate superplasticizer are as follows：the molar ratios of AA to TPEG and oxidant to reductant are both 4：1,7.0 mole% of AA is replaced by AN,the dosage of mercaptoacetic acid is 0.4% of total monomers,the reaction temperature is 45 cC,tbe dropping time of solution B is 1.5 hours, and holding time is 2 hours. Compared to the unmodified polycarboxylic acid type superplasticizer （PCA1）,cyano-modified polycarboxylic acid type superplasticizer（PCA2） has a 2.2%-4.6% higher water reducing ratio,and a better strength growth of concrete at different ages.
出处
《新型建筑材料》
北大核心
2015年第7期33-36,39,共5页
New Building Materials
关键词
聚羧酸减水剂
丙烯腈
净浆流动度
ZETA电位
混凝土性能
polycarboxylic acid type superplasticizer, acrylonitrile,fluidity of cement paste,Zeta potential,concrete performance
