制备了聚磷酸铵(APP)/可膨胀石墨(EG)复配阻燃的硬质聚氨酯泡沫塑料,并分析了复配阻燃剂对其氧指数、烟密度、炭层形貌以及力学性能的影响。结果表明:当APP∶EG为1∶3时,各添加量下的氧指数均达到最高,最高可达35.5%;APP的加入可明显改善EG烟密度大的缺点,且APP生成的紧密炭层将EG生成的蠕虫状炭层固定在材料内部;随着复配阻燃剂的加入泡沫压缩性能提高,冲击性能下降。 Ammonium polyphosphate (APP) / expandable graphite (EG) composite flame retardant rigid polyurethane foam was prepared and its oxygen index, smoke density, carbon layer morphology and mechanical properties were analyzed influences. The results showed that when the APP: EG was 1: 3, the oxygen index reached the maximum at 35.5%, and the addition of APP could obviously improve the shortcomings of the EG smoke density. The worm-like charcoal layer formed by EG was fixed inside the material. With the increase of the compressive properties of foam, the impact properties were decreased.