Accurate thermal decomposition mechanism and kinetic parameters are helpful to analyze the combustion process of flexible polyurethane foam. The thermal decomposition process of flexible polyurethane foam products (amine derivatives) was ignored in the past. Three thermal decomposition mechanisms of flexible polyurethane foam were proposed according to the thermogravimetry experiment of flexible polyurethane foam in the nitrogen atmosphere, two of which included the thermal decomposition of amine derivatives. The global search algorithm was proposed to estimate the kinetic parameters of the thermal decomposition of solid material. The results show that the global search algorithm is efficient and accurate in estimating kinetic parameters. The results also show the thermal decomposition mechanism including the carbodiimide and polycarbondiimide can well describe the thermal decomposition process of flexible polyurethane foam and amine derivatives. The activation energy, pre-exponential factor, and reaction order of flexible polyurethane foam are 187.3 kJ mol⁻¹, 10^15.6 s⁻¹, and 1.22, respectively.

准确的热分解机理和动力学参数有助于分析软质聚氨酯泡沫的燃烧过程。过去忽略了软质聚氨酯泡沫产品（胺衍生物）的热分解过程。根据氮气环境下软质聚氨酯泡沫塑料的热重实验，提出了三种软质聚氨酯泡沫塑料的热分解机理，其中两种包括胺衍生物的热分解。提出了全局搜索算法来估计固体材料热分解的动力学参数。结果表明，全局搜索算法在动力学参数估计中是高效且准确的。结果还表明，包括碳二亚胺和聚碳二亚胺在内的热分解机理可以很好地描述软质聚氨酯泡沫和胺衍生物的热分解过程。柔性聚氨酯泡沫的活化能，预指数因子和反应阶数为187.3 kJ mol^-1，10个^15.6小号^-1，和1.22，分别。