六苯氧基环三磷腈对PC/ABS合金的阻燃作用

通过极限氧指数测定(LOI)、垂直燃烧试验和锥型量热分析研究了六苯氧基环三磷腈(HPTCP)对聚碳酸酯/丙烯腈-苯乙烯-丁二烯共聚物(PC/ABS)合金的阻燃作用。结果表明:HPTCP对PC/ABS具有良好的阻燃效果。当添加量为15%时,阻燃PC/ABS的LOI为25.0%,阻燃等级达FV-0,并且与未阻燃PC/ABS相比,燃烧时的热释放速率、总热释放量、最高热释放速率、平均热释放速率,平均有效燃烧热和质量损失明显降低;热重分析表明,HPTCP对PC/ABS合金的热稳定性影响较小。热重和残余物分析结果表明,HPTCP主要是通过凝聚相产生阻燃作用,HPTCP的添加可有效抑制PC/ABS的分解,促进它成炭,形成膨胀性炭层,该炭层通过隔热、隔氧及阻止PC/ABS分解产物的挥发而产生阻燃作用。

Flame retardancy of hexaphenoxycyclotriphosphazene in PC/ABS alloy

Flame retardancy of hexaphenoxycyclotriphosphazene （HPTCP） in Polycarbonate/acrylonitrile - styrene - butadiene copolymer （PC/ABS） alloy was studied by limiting oxygen index （LOI） measurement, vertical burning and cone calorimeter test （CCT）. The results showed that HPTCP had a good flame retardancy in PC/ABS. When the loading of HPTCP was 15% based on the total weight of the composite, the LOI of the fla me retarded PC/ABS was 25.0% and the flame retarding class meet FV-0, and the heat release rate, total heat release, peak heat release rate, average heat release rate, average effective heat of combustion and mass loss were significantly decreased compared with PC/ABS. The thermogravimetric results showed that HPTCP a less impact on the thermal stability of PC/ABS. The thermogravimetrie results and the analysis of the residues obtained in the cone calorimeter test indicated that HPTCP played a flame retardancy mainly by condensed phase mechanisms, where the addition of HPTCP could effectively retarted the decomposition and promoted the carbonization of PC/ABS, and the formed intumescent layer resulted in a flame retardancy by the barrier effect on heat, air and decomposition products.