木塑复合材料燃烧性能的研究

利用锥形量热仪等评价方法，从引燃时间、释热、质量损失和发烟等方面对木塑复合材料（WPC）以及阻燃WPC的燃烧性能进行了研究。结果表明：WPC的引燃时间为27 s，比人工林木材的引燃时间长，与中密度纤维板（密度086 g/cm3）相当；WPC的释热速率峰值404 kW/m2，燃烧1 200 s的释热总量为180 MJ/m2，平均有效燃烧热为28 MJ/kg，燃烧释热高于人工林木材；WPC的平均质量损失速率为7 g/(s·m2)，低于人工林杨木和马尾松木材；WPC的发烟总量高于人工林木材。相对于聚丙烯（PP）而言，WPC的释热速率峰值远低于PP，木材的引入降低了PP的高释热速率，且质量损失率峰值也大幅度降低。阻燃WPC的释热速率和释热总量有所降低，但发烟量增大，尤其是含卤阻燃物质。因此，对于WPC不宜选择有卤阻燃剂。

Study on burning behavior of wood-plastic composites

The burning behaviors of wood-plastic composites(WPC) and fire-retardant WPC were investigated by testing the ignition time,heat release rate,mass loss,and smoke generation with cone calorimeter in this research.Test results showed that the ignition time of WPC was 27 s,which was longer than that of the plantation wood and similar to that of MDF with a density of 0.86 g/cm3.The peek value of heat release rate(HRR) of WPC was 404 kW/m2,and the total heat released(THR) after combustion for 1 200 s was 180 MJ/m2,and the average effective heat of combustion(HOC) of WPC was 28 MJ/kg which was higher than that of the planted wood.The average mass loss rate(MLR) of WPC was about 7 g/(s·m2),which was lower than that of poplar and masson pine.The total amount of the smoke emitted in the combustion process of WPC was higher than that of the plantation wood.The peek HRR and the MLR of were lower than PP because the wood is dehydrated and given off none combustion composition,for example,water,CO2,CO et al,and take effect as fire retardant.The HRR and THR of WPC treated with fire retardant(nonhalogen and halogen containing fire retardants) has decreased,and the SP has increased,especially the halogen containing fire retardant.Therefore,the halogen containing fire retardant does not fit WPC.