Ammonium polyphosphate (APP) and aluminium diethylphosphonate (ADP) were mixed according to the mass ratio of 4:1, compounded with dipentaerythritol (DPER) to construct a novel intumescent flame retardant (IFR), and organo-montmorillonite (OMMT) as a synergistic flame retardant, then melt blended to prepare intumescent flame retardant polypropylene (PP) composites. The flame retardancy, thermal stability, and mechanical properties of flame retardant polypropylene composites were examined using the limiting oxygen index (LOI), vertical combustion test, thermogravimetric analysis, and cone calorimetry test. The results showed that the LOI value of the flame retardant composite PP3 reached 31.3%, UL-94 reached V-0 level, the peak heat release rate (pHRR) and the total heat release (THR) decreased by 87.8% and 33.7%, respectively, compared with the original sample of PP, and the break elongation increased by 216.4% compared with that of the sample PP1 without the addition of OMMT. The findings demonstrated that adding OMMT to IFR in the right dosage can have a positive synergistic flame retardant impact.

将聚磷酸铵(APP)和二乙基膦酸铝(ADP)按照4:1的质量比混合，与二季戊四醇(DPER)复配构建新型膨胀型阻燃剂(IFR)，与有机蒙脱石(OMMT)作为协同剂阻燃剂，然后熔融共混制备膨胀型阻燃聚丙烯（PP）复合材料。采用极限氧指数(LOI)、垂直燃烧试验、热重分析和锥形量热试验等方法考察了阻燃聚丙烯复合材料的阻燃性能、热稳定性和力学性能。结果表明，阻燃复合材料PP3的LOI值达到31.3%，UL-94达到V-0级，峰值放热量（pHRR）和总放热量（THR）分别下降87.8%和33.7%，与PP原样品相比，断裂伸长率比未添加OMMT的样品PP1提高了216.4%。研究结果表明，在 IFR 中添加正确剂量的 OMMT 可以产生积极的协同阻燃效果。