聚丙烯（PP）的易燃性使其对环境和安全造成影响，开发环保且高效的无卤阻燃剂十分必要。Ⅱ型聚磷酸铵（APP）热稳定性差，因此需要对其进行改性研究。在不同温度下通过混合包覆制备新型磷系阻燃剂，评估其对PP材料力学性能和阻燃性能的影响。结果表明：由Ⅱ型聚磷酸铵、三聚氰胺与硅烷偶联剂KH560按照质量比3∶1∶0.01在200 ℃高混机混合60 min制备的阻燃剂，力学和阻燃性能最佳且稳定。该类材料的最大热释放率（MARHE）降低至249.96 kW/m²，热释放速率（HRR）降低至85.75 kW/m²，质量损失速率（MLR）降低至1.78 g/（s·m²），总热释放热量（THR）降低至68.04 MJ/m²，总产烟量（TSP）降低至9.07 m²，引燃时间（TTI）延长至33 s。该类阻燃剂高效且环保，改性后PP材料满足阻燃行业标准要求。

Polypropylene (PP) flammability poses an impact on the environment and safety, making the development of environmentally friendly and efficient halogen-free flame retardants essential. Type Ⅱ Ammonium polyphosphate (APP) has poor thermal stability, hence it needs for modification research. In this study, new phosphorus-based flame retardants were prepared by mixing and coating at different temperatures for the evaluation of their effects on the mechanical and flame-retardancy of PP materials. The results showed that the flame retardant prepared from type Ⅱ ammonium polyphosphate, melamine and silane coupling agent KH560 according to the mass ratio of 3∶1∶0.01 mixed at 200 ℃ for 60 min in a high mixer had the best and stable mechanical and flame retardancy. The maximum heat release rate (MARHE) of these materials was reduced to 249.96 kW/m², the heat release rate (HRR) was reduced to 85.75 kW/m², the mass loss rate (MLR) was reduced to 1.78 g/(s·m²), the total heat release heat (THR) was reduced to 68.04 MJ/m², the total smoke production (TSP) was reduced to 9.07 m², and the time to ignition (TTI) was extended to 33 s. The flame retardant is highly efficient and environmentally friendly, and the modified PP material meets the requirements of flame retardant industry standards.