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为了探究140℃条件下不同热氧老化时间对红磷(RP)/长玻纤增强聚丙烯(LGFPP)阻燃体系的阻燃性能、燃烧性能以及残炭形貌的影响。并采用极限氧指数值测试(LOI)、垂直燃烧测试(UL-94)、锥形量热仪(CONE)等对热氧老化后RP/LGFPP阻燃体系结构与性能的影响进行了测试表征。结果表明:伴随热氧老化时间的增加,RP/LGFPP阻燃体系的LOI表现为先增大后减小变化规律,阻燃等级均保持为V-0级;试样的引燃时间(TTI)逐渐增加,热释放速率峰值(PHRR)及其平均值(MHRR)、总热释放速率(THR)值匀呈现不断下降的趋势。通过对锥形量热仪燃烧测试残留炭层的宏观形貌图分析,结果表明:未老化试样燃烧后形成黑色致密而均匀的残留炭层,试样燃烧后生成的炭层颜色随着经过热氧老化的延长逐渐变浅,且炭层表现为不致密和较多裂纹。
In order to investigate the effect of different thermal aging time on flame retardancy, combustion performance and residual carbon morphology of red phosphorus (RP) / long glass fiber reinforced polypropylene (LGFPP) flame retardant system at 140 ℃. The effects of LOI, UL-94 and CONE on the structure and properties of RP / LGFPP flame retardant composites after thermal aging were characterized. The results showed that the LOI of RP / LGFPP flame-retardant system firstly increased and then decreased with the increase of the aging time of hot oxygen, and the flame retardancy of the RP-LGFPP system remained V-0. The ignition time (TTI) (PHRR) and their average (MHRR), total heat release rate (THR) values showed a declining trend. The results of the macroscopic topography analysis of the residual charcoal layer after combustion by the cone calorimeter show that the unburned black carbon layer forms a dense and uniform residual charcoal layer after burning, The extension of thermal aging gradually lightened, and the carbon layer showed no dense and more cracks.