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抗泥缓释型聚羧酸保坍剂的制备及性能研究
作者：汪源1，汪苏平2，纪宪坤1
（1.武汉三源特种建材有限责任公司，湖北 武汉 430000；2.武汉源锦建材科技有限公司，湖北 武汉 430000）
摘要：为了减少泥土对聚羧酸减水剂的吸附，试验制备了抗泥小单体，通过自由基共聚反应将抗泥小单体引入到聚羧酸减水剂分子结构中，合成抗泥缓释型聚羧酸保坍剂，测试其抗泥性能，并与市售缓释型聚羧酸保坍剂M21进行对比。结果表明，对不同种类水泥，0~40 ℃温度范围内，加入2.0%蒙脱土时，合成保坍剂KN-4的保坍和抗泥效果及对水泥种类和温度的适应性均优于M21；将KN-4应用到混凝土中，其抗泥和保坍效果优于M21，并且对混凝土有明显的增强作用。
关键词：聚羧酸保坍剂；缓释型；抗泥性能；混凝土
中图分类号：TU528.042 文献标识码：A 文章编号：1001-702X（2020）05-0134-04
Research on the synthesis and performance of an anti-mud slow-released polycarboxylate slump retaining agent
WANG Yuan1，WANG Suping2，JI Xiankun1
（1.Wuhan Sanyuan Special Building Materials Co. Ltd.，Wuhan 430000，China；
2.Wuhan Ujoin Building Material Technology Co. Ltd.，Wuhan 430000，Chin）
Abstract：In order to reduce the adsorption of clay on polycarboxylate superplasticizer，a small anti-mud monomer was prepared and introduced into the molecular structure of polycarboxylate superplasticizer by free radical copolymerization to form anti-mud sustain released polycarboxylate slump retaining agent. Then its anti-mud properties were tested and comparison was made to the commercially available product slow-released polycarboxylate herbicide M21. The results show that for different cement types，with 2.0% montmorillonite in the temperature range of 0~40 ℃，KN-4's moisture retention and anti-mud effect and adaptability to cement type and temperature are better than M21，KN-4 is applied to concrete，its anti-mud and moisture-preserving effect is better than M21，and it has a significant improvement effect on the strength of concrete.
Key words：polycarboxylate herbicide，slow-released，anti-mud properties，concrete