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酯醚型聚羧酸减水剂的制备及性能
作者:何廷树1 杨仁和1 徐一伦2  琛1 邹亚婷1 李红艳1 房佳斌1 
单位:1. 西安建筑科技大学材料与矿资学院 西安 710055 2. 陕西友邦新材料科技有限公司 西安 712046 
关键词:聚羧酸系减水剂 酯醚共聚 分子结构 性能对比 
分类号:TU528
出版年,卷(期):页码:2018,46(2):218-223
DOI:
摘要:

采用自由基共聚法合成了酯醚共聚型聚羧酸减水剂(PCst),红外光谱分析表明该减水剂分子结构中同时含有酯型与醚型支链。将PCst与酯型聚羧酸减水剂(PCes)和醚型聚羧酸减水剂(PCet)进行了性能对比研究。水泥净浆试验表明,PCet的净浆流动度大,PCes较小,PCst的流动度介于两者之间;掺加PCet的水泥净浆易泌水,且对用水量波动和含泥量的敏感性大,PCes与PCst的净浆粘聚性好,对用水量波动和含泥量的敏感性小。混凝土试验表明,PCet的减水率大,PCes较小,PCst介于两者之间,但掺加PCet的新拌混凝土和易性略差,坍落度经时损失大,PCes与PCst的混凝土拌合物不但和易性好,而且坍落度经时损失小

The ester ether copolymer polycarboxylate superplasticizer (PCst) was synthesized via free radical copolymerization. Based on the analysis by infrared spectroscpy, the structure of PCst contains ester and ether side chains. The properties of PCst, ester type polycarboxylate superplasticizer (PCes) and ether type polycarboxylate superplasticizer (PCet) were investigated. The results indicate that the sequence for the fluidity of cement pastes with three different polycarboxylate superplasticizers (PC) is PCet > PCst > PCes. The cement pastes with PCet are easily bleeding, which is sensitive to the change of water consumption and mud content. The cement pastes with PCst and PCes have the excellent cohesiveness, which is less sensitive to the fluctuation of water consumption and mud content. For concrete, the sequenceincreased order for the water reducing rate for different polycarboxylates is PCet > PCst > PCes. However, the workability of fresh concrete mixed with PCet is slightly worse, and the slump loss is greater. The concrete mixture with PCes and PCst has an excellent workability and a less slump loss with time.
Keywords: polycarboxylate superplasticizers; ester ether copolymerization; molecular structure; properties comparison
基金项目:
陕西省工业攻关项目(2016GY—205)。
作者简介:
何廷树(1965—),男,博士,教授
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