详细探究二乙基次膦酸铝(AlPi)、勃姆石(BM)复配使用对玻纤增强尼龙PA6T-66的阻燃协效作用。AlPi加入质量为14%时,复合材料试样通过UL 94 0.8mm/V级阻燃测试;极限氧指数(LOI)由纯玻纤增强树脂的24.5%提高至45.3%。AlPi的添加质量继续提高至16%或者复配1.5% BM时,复合材料试样通过UL 94 0.8mm V-0级阻燃测试,且14% AlPi/1.5% BM的阻燃性能甚至优于16% AlPi,显示了AlPi与BM的明显阻燃协同作用。热重分析测试表明,加入BM后,热氧降解过程中结焦量和最终残留率都明显增加,这可能是导致BM和AlPi间阻燃协效作用的主要原因。复合材料燃烧行为的锥形量热仪表征结果表明,AlPi和BM复配使用能够显著地降低热释放速率(HRR)和总热释放量(THR)等。
The effect of boehmite (BM) as a synergistic agent with aluminium diethyphosphinate (AlPi) on the flame retardancy and thermal degradation of glass fiber-reinforced(GFR) polyamide 6T-66 were fully investigated.The results demonstrated that standard specimens passed vertical burning UL-94 0.8mm V-1 flammability rating,and the limiting oxygen index (LOI) was increased by 20.8% to 45.3% when the loading amount of AlPi was 14wt%.The specimens passed V-0 when the loading amount of AlPi was further increased to 16wt% or when 1wt% boehmite was added,which indicated synergistic action between AlPi and BM.Thermogravimetric analysis (TGA) revealed that adding BM facilitated the char formation during thermo-oxidative degradation,which may attribute to the above synergistic effect.Cone calorimeter test was applied to evaluate the fire behaviors,which demonstrated that AlPi combined with BM efficiently reduced the fire behavior parameters such as heat release rate (HRR) and total heat release (THR).
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