【摘要】 采用以磷酸氢二铵（DAP）为原料的高温熔融聚合工艺制备了高聚合度Ⅱ型聚磷酸铵（Ⅱ-APP）。利用XRD、FT-IR、SEM等表征手段对其结构形貌进行表征，以产品水溶性为质量指标，考察了氧化铁、氧化镁、磷酸氢钙3种杂质以及杂质质量分数对高聚Ⅱ-APP产品水溶性和形貌的影响。结果表明，在实验设定的添加量范围内，杂质不影响高聚Ⅱ-APP的晶型结构，但会使1 100～850 cm^-1范围内的红外吸收峰发生偏移，降低产品聚合度，增大产品水溶性。当原料中氧化铁、氧化镁以及磷酸氢钙质量分数分别低于DAP质量分数的0.364%、0.122%、0.163%时，聚合所得高聚Ⅱ-APP产品的溶解度能够满足国标要求。原料中的杂质会对Ⅱ-APP产品的形貌产生影响，过量杂质会造成聚合物颗粒表面粗糙，增加产品的团聚。但是当镁离子质量分数低于DAP质量分数的0.182%时，Ⅱ-APP产品的粒径及形貌均优于未添加杂质的产品，表明适量的金属镁离子可以起到修饰高聚Ⅱ-APP产品形貌的作用。更多还原

【Abstract】 A high polymerization degree Ⅱ-type ammonium polyphosphate（Ⅱ-APP） is prepared via high temperature melt polymerization process with diammonium hydrogen phosphate（DAP） as raw material.XRD,FTIR and SEM are employed to characterize the product sample’s structure and morphology.Taking water solubility of the product as quality index, the effects of iron oxide, magnesium oxide and calcium hydrogen phosphate as well as the content of impurities on the water solubility and morphology of Ⅱ-APP product are evaluated.It is shown from the results that the impurities, within the designed experimental addition range, do not affect the crystal structure of Ⅱ-APP,but can offset the infrared absorption peak in the range of 1 100-850 cm^-1,reduce the polymerization degree of Ⅱ-APP and increase its water solubility.The solubility of Ⅱ-APP product obtained can meet the requirements of China’s national standard when the concentrations of iron oxide, magnesium oxide and calcium hydrogen phosphate in the raw material are lower than 0.364%,0.122% and 0.163% of DAP mass concentration, respectively.Impurities generally affect the morphology of Ⅱ-APP product.Excessive impurities will make the surface of polymer particles rough and increase the agglomeration of products.However, when the addition of magnesium ions is lower than 0.182% of DAP mass concentration, the particle size and morphology of Ⅱ-APP product are better than those of the product without impurities, indicating that an appropriate amount of magnesium ions can modify the morphology of Ⅱ-APP product.更多还原