利用熔融共混法制备了长玻纤增强聚丙烯/红磷(LGFPP/RP)阻燃复合材料。采用热烘箱老化法分析了140℃条件下不同热氧老化时间对LGFPP/RP阻燃体系热氧老化性能的影响;并通过氧指数(OI)、垂直燃烧、热性能和力学性能测试对LGFPP/RP阻燃体系的阻燃性能、热稳定性和力学性能进行了研究。结果表明:随着热氧老化时间的延长,LGFPP/RP阻燃体系的OI值呈先增大后减小的趋势,且垂直燃烧等级始终保持在FV-0级;同时,LGFPP/RP阻燃体系的最大质量损失速率所对应的温度(Tmax)变化不大,体系的起始分解温度(T5%)则呈现出先升高后下降的趋势。另外,经热氧老化后,试样的力学性能显著下降。 The long glass fiber reinforced polypropylene / red phosphorus (LGFPP / RP) flame retardant composite was prepared by melt blending method. The effect of different thermal aging time on the thermal aging properties of LGFPP / RP flame retardant system was analyzed by hot oven aging method. The effects of different aging time on the thermal aging performance of LGFPP / RP flame retardant system were analyzed. The oxygenation index (OI), vertical burning, thermal and mechanical properties of LGFPP / RP flame retardant system flame retardant properties, thermal stability and mechanical properties were studied. The results showed that the OI value of LGFPP / RP flame retardant system first increased and then decreased with the prolongation of thermal oxygen aging time, and the vertical combustion rating remained at FV-0 level. Meanwhile, the flame retardancy of LGFPP / RP flame retardant system The temperature (Tmax) corresponding to the maximum mass loss rate of the system does not change much, and the initial decomposition temperature (T5%) of the system shows a trend of first increasing and then decreasing. In addition, after thermal aging, the mechanical properties of the sample decreased significantly.