阻燃木粉—聚丙烯复合材料的热解特性及热解动力学研究

Pyrolysis characteristics and pyrolysis kinetics analysis of flame retarded wood flour-PP composites

采用热重分析仪分析阻燃木粉—聚丙烯复合材料的热解特性,并研究不同升温速率对添加聚磷酸铵(APP)、改性聚磷酸铵(M-APP)的阻燃木塑复合材料热解行为的影响,通过热重曲线建立热解动力学方程和分布活化能模型,揭示了阻燃木粉—聚丙烯复合材料的热稳定性、热解反应活化能。结果表明:APP和M-APP2种阻燃剂相比,M-APP降低了复合材料的起始分解温度,并提高了木塑复合材料的残炭量;M-APP使木粉最高分解温度由344.8℃降低到334.1℃,使聚丙烯的最高分解温度由518.5℃提高到525.6℃,残炭量由19.4%提高到21.7%;添加M-APP木塑复合材料的活化能比添加APP的低。所以作为木粉—聚丙烯木塑复合材料的阻燃剂,M-APP的阻燃效果优于APP。

In order to research the pyrolysis characteristics of flame retarded wood flour （WF） -PP composites, thermogravimetric study of flame retarded wood-plastic composites using APP and M-APP was carried out using thermogravimetric analyzer （TGA） with N2 atmosphere at different heating rates. The pyrolysis kinetic equation was found, and the activation energy of pyrolysis process was obtained by TG spectra. The results showed that the initial decomposition temperature of WF-PP composite added with M-APP decreased, and the carbon residue was improved. The maximum decomposition temperature with WF decreased from 344.8 to 334.1℃, the maximum decomposition temperature with PP was improved from 518.5 to 525.6 ℃, and the carbon residue was increased from 19.4% to 21.7%. Then the activation energy with added M-APP was lower than that of added APP, so flame retardant effect of M-APP is better than APP for wood flour-PP composites.