阻燃超低密度植物纤维材料的热解动力学分析

Investigation on pyrolysis kinetics of fire retardant plant fiber-based ultra-low density materials

利用动态热重法,对阻燃剂施加量分别为0、30%、40%的超低密度植物纤维发泡材料的TG-DSC-T曲线进行分析。结果表明,热解过程可分为5个阶段,其中爆燃阶段是控制火灾蔓延的关键,阻燃剂施加量达到40%才有理想的阻燃效果。通过预设热解反应的反应级数,对TG数据线性拟合,根据线性相关度选择合理的反应级数,建立热解各阶段的反应动力学模型,结果显示热解过程中的反应速率越稳定,则反应级数越小。

Through dynamic thermogravimetry, the pyrolysis curve of ultra-low density plant fibre-based foaming materials （ ULD materials）, which were treated by fire-retardant with different dosage based on weight of oven dried fiber as 0, 30% wt and 40% wt respectively, was studied. The result showed the pyrolysis curve experienced five stages and the deflagration stage was key stage to control fire spread, furthermore, the ideal purpose of fire-retardance was achieved under dosage as 40% wt. The experimental data were treated by supposing the reaction order of ULD materials pyrolysis to be 0.5, 1, 1.5 and 2, respectively. The appropriate reac- tion order of 0.5 or 2 was obtained by minimizing the difference between the calculated and measured data. Reaction kinetics equa- tions were established and indicated that more stable is the reaction velocity, less is the reaction order.