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羧酸酯水解速率对缓释型聚羧酸超塑化剂分散性能的影响
作者:李慧群1  燕1 2 王子明1 3 崔素萍1 3 
单位:(1. 北京工业大学材料科学与工程学院 北京 100124 2. 中国建筑材料科学研究总院 北京 100024  3. 工业大数据应用技术国家工程实验室 北京 100124) 
关键词:聚羧酸超塑化剂 缓释 不饱和羧酸酯 水解速率 净浆流动度 
分类号:TU528
出版年,卷(期):页码:2020,48(2):0-0
DOI:
摘要:

 为研究羧酸酯单体对缓释型聚羧酸超塑化剂(PCE)缓释及其分散性能的影响,首先系统测定了不同结构的羧酸酯单体在pH=12.0的氢氧化钠溶液中水解率随反应时间的变化趋势,通过线性拟合得到羧酸酯的水解反应速率常数。以不同结构的不饱和羧酸酯作为功能单体制备缓释型聚羧酸超塑化剂,测定掺加缓释型聚羧酸超塑化剂水泥净浆流动度随时间的变化趋势。分析了羧酸酯的水解速率对超塑化剂的分散及缓释效果的影响。结果表明:丙烯酸甲酯和亚甲基丁二酸二甲酯各代替33.3%和25.0%的丙烯酸使PCE分散性能增强明显,水泥净浆流动度在2 h内分别从149 mm和104 mm增加到223 mm和212 mm;羧酸酯水解速率越快,所制备的PCE的缓释速率越快,达到最高分散性能所需的时间越短;所制备的PCE所含酯基越多,得到的PCE缓释能力越强,分散性能随时间增加越明显。聚羧酸超塑化剂的缓释效果不仅与所含羧酸酯的水解反应速率和可释放的羧基数量有关,还取决于其羧酸酯单体聚合活性与聚合反应体系的匹配程度。

基金项目:
工业大数据应用技术国家工程实验室建设项目(312000522303);国家自然科学基金项目(51578025)。
作者简介:
参考文献:

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