将焦磷酸哌嗪（PPAP）分别与多种阻燃剂进行复配以制备膨胀型阻燃剂（IFR），最后与聚丙烯（PP）共混制备PP阻燃复合材料。采用垂直燃烧、极限氧指数（LOI）、锥形量热、热重分析和力学性能等测试手段对这几种复合材料进行表征。结果表明：与PP样品相比，复合材料的LOI由17.6%升至26%以上，残炭率由0.09%增加至1.98%以上，热分解T _1%和T _5%分别升高11.4 ℃和41.2 ℃以上，说明阻燃剂的加入增强了阻燃性能。同时，复合材料的热释放速率峰值、平均热释放量、总热释放量、总产烟量大幅降低，阻燃及抑烟性能明显提升，而力学性能反而降低。获得PPAP与三聚氰胺焦磷酸盐（DMPY）复配的阻燃效果最佳，其中LOI为29.2%，残炭率为2.65%，热分解T _1%和T _5%分别为286.6 ℃和372.7 ℃，且力学性能受影响最小。

Piperazine pyrophosphate (PPAP) was compounded with a variety of flame retardants to prepare intumescent flame retardant (IFR), and finally blended with polypropylene (PP) to prepare PP flame retardant composites. These composites were characterized by vertical combustion, limiting oxygen index (LOI), cone calorimetry, thermogravimetric analysis and mechanical properties. The results show that compared with PP samples, the LOI of these composites increases from 17.6% to more than 26%, the carbon residue rate increases from 0.09% to more than 1.98%, and the thermal decomposition T _1% and T _5% increase by 11.4 ℃ and 41.2 ℃, respectively, indicating that the addition of flame retardant enhanced the flame retardant. At the same time, the peak heat release rate, average heat release, total heat release and total smoke production of these composites are greatly reduced, and the flame retardancy and smoke suppression properties are significantly improved, while the mechanical properties are reduced. The flame retardant effect of PPAP and melamine pyrophosphate (DMPY) is the best, in which the LOI is 29.2%, the carbon residue rate is 2.65%, the thermal decomposition T _1% and T _5% are 286.6 °C and 372.7 °C, respectively, and the mechanical properties are the least affected.