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新型磷酸基缓凝剂的合成及性能评价

作者:王涛,王兵,马建峰,亓帅,黄振,夏正奕,杨勇

关键字:新型,磷酸,基缓,凝剂,的,合成,及,性能,评价,

 
(江苏苏博特新材料股份有限公司,江苏 南京  211103)
    摘要:以尿素、亚磷酸和甲醛溶液为原料,以质子酸硫酸为催化剂,在一定温度下发生类曼尼希反应,采用一步法制备了一种新型结构磷酸基缓凝剂HN-101,其单分子结构含有4个磷酸根。通过净浆、砂浆和混凝土试验,考察了该缓凝剂与减水组分聚羧酸减水剂复配时的应用性能.结果表明:该缓凝剂具有耐黏土的特点,对机制砂具有良好的适应性,同时,该缓凝剂能大幅延长缓凝时间,并不影响水化后期混凝土的强度,对大体积混凝土具有潜在的应用价值。
    关键词:缓凝剂;磷酸根;新型结构;强缓凝;黏土耐受性
    中图分类号:TU528.042+.3        文献标识码:A        文章编号:1001-702X(2020)05-0130-04
 
Synthesis and performance evaluation of a new phosphate retarder
WANG Tao,WANG Bing,MA Jianfeng,QI Shuai,HUANG Zhen,XIA Zhengyi,YANG Yong
(Jiangsu Sobute New Materials Co. Ltd.,Nanjing 211103,China)
    Abstract:A phosphate retarder HN-101 with a new structure was prepared in one step by using urea,phosphorous acid and formaldehyde solution as raw materials and proton acid sulfuric acid as catalyst,with Mannich-like reaction under certain temperature. Its single molecular structure contains 4 phosphates. The application performance of this sample was tested with cement paste,cement mortar and concrete mixed with the PCE as the water-reducing component. The results showed that the HN-101 has the characteristics of clay resistance and good adaptability to machine-made sand. And also the HN-101 can greatly extend the retardation time without affecting concrete strength in the later stage of hydration. It would be beneficial to the application of large volume concrete.
    Key words:retarder,phosphate,novel structure,strong retarding,clay tolerance