磷-胺-醛树脂型阻燃剂处理落叶松的热分析及其动力学

将落叶松用一系列磷-胺-醛树脂型阻燃剂进行阻燃处理，所得阻燃落叶松采用热分析、锥形量热研究其热解行为，用氧指数、剩炭率、热释放速率、总热释放量等参数表征它的阻燃性能，并用Broido方程计算落叶松的动力学参数. 结果发现，阻燃落叶松氧指数、剩炭率增加，热释放速率、总热释放量降低，表明经阻燃剂处理的落叶松燃烧性降低. 落叶松经阻燃剂处理后，热解活化能降低很多，表明阻燃剂对落叶松热解具有催化作用，其主要热解阶段在低于300℃进行. 在此温度下，落叶松热解主要发生脱水、重排交联炭化反应，产生水、CO及CO2、固体残渣，可燃性气体大大降低，达到降低落叶松燃烧性的目的.

Thermal Analysis and Kinetics of Larch Treated by Phosphorus-Amine-Formaldehyde Flame Retardants

Larch was treated with phosphorus-amine-formaldehyde flame retardants. The thermal degradation of the treated larch samples was studied by thermal analysis and cone calorimeter. The flame retardant properties were characterized in limiting oxygen index, char yield, heat release rate and total heat release. Kinetic parameters of thermal degradation were obtained following the method of Broido. The limiting oxygen index and char yield increased while the heat release rate and total heat release decreased, which shows that combustibility of larch has largely decreased. For the degradation of the larch treated with flame retardants, the activation energy was greatly decreased, which shows that the flame retardants catalyze the dehydration and decomposition of larch. The main decomposition of larch occurred at lower temperatures (<300℃) through the reaction which includes dehydration, rearrangement, carbonization, evolution of carbon monoxide and carbon dioxide, and ultimately a carbonaceous residue, resulting in the formation of less flammable products and correspondingly more char, leading to low combustibility.