蔗糖酯改性水泥基复合材料的合成和性能表征  

Synthesis and characterization of sucroseester modified cement-based composites

作　　者：李建伟[1] 苏亚林 孙玉[1] 王文平[1] 

机构地区：[1]合肥工业大学化学工程学院,安徽合肥230009

出　　处：《弹性体》2017年第5期17-21,共5页China Elastomerics

基　　金：国家自然科学基金项目(51372059)

摘　　要：合成了一种新的单体蔗糖酯,并通过化学接枝将其引入聚羧酸减水剂主链上合成蔗糖酯改性的聚羧酸减水剂,通过蔗糖酯的引入,改善了传统聚羧酸减水剂适应性差、试块后期强度不足的问题。通过自由基聚合反应,考察了不同反应条件对产物性能的影响,得出其最佳合成条件为:甲代烯丙基聚氧乙烯醚、丙烯酸、甲基丙烯酸蔗糖酯的量比为1∶4∶1.0,反应时间为5h,反应温度为50℃,引发剂质量分数为4%。后期混凝土性能测试表明,蔗糖酯改性减水剂的水泥净浆流动度相比于未改性聚羧酸减水剂的水泥样品有很大提高;抗压强度和抗折强度测试表明,蔗糖酯改性减水剂可以有效提高水泥试块的后期抗压、抗折强度;扫描电镜(SEM)分析测试表明,蔗糖酯改性聚羧酸减水剂有利于针状钙矾石的生成,从而提高水泥基体后期强度。A new monosaccharide sucrose ester was synthesized and introduced into the main chain of polycarboxylate superplasticizer by chemical grafting to synthesize sucrose ester modified polycarboxylate water reducing agent.The effects of different reaction conditions on the properties of the products were investigated.The optimum conditions were as follows：methylethyl allyl glycol：acrylic acid：maltose methacrylate was 1∶4∶1.0,reaction time was 5h,reaction temperature 50℃ and 4%for the initiator.The concrete performance test of the similar products at the later stage showed that the sucrose ester modified water reducing agent can effectively improve the initial fluidity and late strength of concrete.

关 键 词：聚羧酸减水剂 蔗糖酯 改性 净浆流动度 

分 类 号：TQ172.79[化学工程—水泥工业]