农用聚磷酸铵的制备与表征
发布时间：2018-10-23 18:00
【摘要】：农用聚磷酸铵在中国的发展和研究起步较晚,因此有必要对其生产技术做深入的研究。对磷酸法、磷酸尿素缩合法制备农用聚磷酸铵做了研究,考察了反应温度、反应时间、初始磷酸浓度、反应物料配比等对产品性质的影响。研究表明,当磷酸中P_2O_5质量分数为50%、聚合温度为240℃、聚合时间为180 min时,磷酸法所制备的产品聚合度可以达到14.9;尿素对聚磷酸铵的聚合度具有显著影响,若聚合温度为240℃、磷酸中P_2O_5质量分数为50%条件下引入与磷酸物质的量比为1.4的尿素反应120 min,可制得聚合度为31.5的Ⅰ型聚磷酸铵。
[Abstract]:Since the development and research of agricultural ammonium polyphosphate in China is late, it is necessary to study the production technology of agricultural ammonium polyphosphate. The preparation of agricultural ammonium polyphosphate by phosphoric acid and urea phosphate condensation was studied. The effects of reaction temperature, reaction time, initial phosphoric acid concentration and ratio of reactants on the properties of agricultural ammonium polyphosphate were investigated. The results show that when the mass fraction of P_2O_5 in phosphoric acid is 50%, the polymerization temperature is 240 鈩，
本文编号：2290047
[Abstract]:Since the development and research of agricultural ammonium polyphosphate in China is late, it is necessary to study the production technology of agricultural ammonium polyphosphate. The preparation of agricultural ammonium polyphosphate by phosphoric acid and urea phosphate condensation was studied. The effects of reaction temperature, reaction time, initial phosphoric acid concentration and ratio of reactants on the properties of agricultural ammonium polyphosphate were investigated. The results show that when the mass fraction of P_2O_5 in phosphoric acid is 50%, the polymerization temperature is 240 鈩，
本文编号：2290047
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