芳纶浆粕对膨胀阻燃聚脲的燃烧行为影响分析

In response to the thermal protection requirements of ammunition under extreme thermal shock conditions, this study systematically investigated the effects of aramid pulp (AF) on the specific thermal protection properties of intumescent flame-retardant polyurea (PUA) by modifying PUA with AF in combination with an intumescent flame retardant. The results indicated that, compared with conventional intumescent flame-retardant PUA composites, the composites incorporating AF exhibited a lower limiting oxygen index (LOI) and a higher heat release rate in the microscale combustion calorimeter (MCC) test. However, in the cone calorimeter and oxyacetylene ablation tests, the addition of low levels of AF (0.5 wt% and 1.0 wt%) further reduced the heat release and significantly enhanced the ablation resistance of the materials. The rational explanation proposed in this paper for this specific thermal protection phenomenon will contribute to the further development of the flame-retardant mechanisms of one-dimensional materials and their applications in the field of thermal protection coatings for safe ammunition.