磷酸二氢铵-尿素缩聚法制备聚磷酸铵研究
发布时间：2019-06-28 18:40
【摘要】：采用磷酸铵盐-尿素脱水聚合法制备聚磷酸铵,通过单一变量的方法讨论反应时间、反应温度、配料比等因素对聚磷酸铵产品性能的影响。分别采用重量法测定产品的磷含量,蒸馏法测产品的含氮量,端基滴定法来确定产品的平均聚合度,并通过XRD验证聚磷酸铵产品的晶型。实验结果表明,最佳工艺条件为:原料配比[n(磷酸二氢铵)∶n(尿素)]为1∶1.1,反应时间为1.5 h,反应温度为260℃,在此条件下所得聚磷酸铵产品磷质量分数能达到73.1%,氮质量分数能达到14.6%,平均聚合度为46.9,完全达到I型工业聚磷酸铵要求。
[Abstract]:Ammonium polyphosphate was prepared by dehydration polymerization of ammonium phosphate and urea. The effects of reaction time, reaction temperature and proportioning ratio on the properties of ammonium polyphosphate were discussed by a single variable method. The phosphorus content of the product was determined by gravimetric method, the nitrogen content of the product was measured by distillation method, and the average degree of polymerization was determined by end group titration. The crystal form of ammonium polyphosphate product was verified by XRD. The experimental results show that the optimum technological conditions are as follows: the ratio of raw material [n (ammonium dihydrogen phosphate): n (urea)] is 1 鈮，
本文编号：2507521
[Abstract]:Ammonium polyphosphate was prepared by dehydration polymerization of ammonium phosphate and urea. The effects of reaction time, reaction temperature and proportioning ratio on the properties of ammonium polyphosphate were discussed by a single variable method. The phosphorus content of the product was determined by gravimetric method, the nitrogen content of the product was measured by distillation method, and the average degree of polymerization was determined by end group titration. The crystal form of ammonium polyphosphate product was verified by XRD. The experimental results show that the optimum technological conditions are as follows: the ratio of raw material [n (ammonium dihydrogen phosphate): n (urea)] is 1 鈮，
本文编号：2507521
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