A novel phosphorus-nitrogen flame retardant, nano zirconium amino-tris-(methylenephosphonate) (Zr-AMP), successfully synthesized by allowing amino trimethylene phosphonic acid (AMP) to react with ZrOCl·8H₂O, was incorporated into rigid polyurethane (RPU) foam with expandable graphite (EG) to prepare flame retarded composites. A synergistic effect between nano Zr-AMP and EG on flame retarded and physical-mechanical properties of RPU foam was observed. The RPU foam containing 3 wt% nano Zr-AMP and 12 wt% EG (RPU/12EG/3Zr-AMP) achieved a UL-94 V0 rating with a limiting oxygen index of 30.5%. RPU/12EG/3Zr-AMP showed a 74.4% reduction of peak heat release rate relative to untreated RPU foam. Furthermore, RPU/12EG/3Zr-AMP possessed lower thermal conductivity compared with the RPU foam with 15 wt% EG (RPU/15EG), while the compressive strength of RPU/12EG/3Zr-AMP was enhanced by 40% compared with the one of the latter. The thermogravimetric analysis showed that the simultaneous addition of nano Zr-AMP and EG had a positive impact on improving the char yield and thermal stability of RPU foam.

氨基三亚甲基膦酸（AMP）与ZrOCl·8H ₂反应成功合成了一种新型的磷氮阻燃剂氨基三（亚甲基膦酸酯）纳米锆将O掺入具有可膨胀石墨（EG）的硬质聚氨酯（RPU）泡沫中，以制备阻燃复合材料。观察到纳米Zr-AMP和EG对RPU泡沫的阻燃和物理力学性能的协同作用。包含3 wt％纳米Zr-AMP和12 wt％EG（RPU / 12EG / 3Zr-AMP）的RPU泡沫达到UL-94 V0等级，极限氧指数为30.5％。与未处理的RPU泡沫相比，RPU / 12EG / 3Zr-AMP的峰值放热率降低了74.4％。此外，与含15 wt％EG的RPU泡沫（RPU / 15EG）相比，RPU / 12EG / 3Zr-AMP的导热系数更低，而与之相比，RPU / 12EG / 3Zr-AMP的抗压强度提高了40％后者。