聚氨酯软泡及其焦油的热解特性及动力学分析

Pyrolysis Characteristics and Kinetic Analysis of Flexible Polyurethane Foam and the Tar

为研究软质聚氨酯泡沫(FPUF)及其焦油(Tar)的热解特性,采用FPUF30及热解生成的焦油在氮气、空气中进行热重分析,并通过Flynn-Wall-Ozawa法和Kissinger法分别计算FPFU30与Tar的活化能。热重分析结果表明:氮气气氛下FPUF的热解分为2个阶段,第一阶段为聚氨酯链中硬段(二异氰酸酯)的分解,第二阶段为软段(多元醇)的分解;Tar只有一个热解阶段,为聚氨酯长链中软段部分的分解。空气气氛下FPUF30和Tar都有2个分解阶段分别对应有机组分和残炭的分解,且有机组分的分解占主导地位。动力学分析结果表明:FPUF比Tar分解的平均活化能更低,这说明第一个阶段热氧化降解之后的焦油具有更高的热稳定性。本研究结果对FPUF火灾的防治具有重要指导意义和参考价值。

In order to study the pyrolysis characteristics of flexible polyurethane foam(FPUF)and its tar(Tar),FPUF30 and the tar generated from pyrolysis were subjected to thermogravimetric analysis in nitrogen and air,respectively.The activation energies of FPFU30 and Tar were calculated by Flynn-Wall-Ozawa method and Kissinger method.The results showed that the pyrolysis of FPUF under nitrogen atmosphere can be divided into two stages,the first stage is the decomposition of the hard segment(Diisocyanate)and the second stage is the decomposition of the soft segment(Polyol)in the polyurethane chain;Tar only has one pyrolysis stage,which is the decomposition of the soft segment in the polyurethane long chain.Under air at⁃mosphere,both FPUF30 and Tar have two decomposition stages corresponding to the decomposition of or⁃ganic components and residual carbon,and the decomposition of organic components dominates.The kinetic analysis results indicated that the average activation energy of FPUF decomposition is lower than that of Tar,indicating that the tar after thermal oxidation degradation in the first stage has higher thermal stability.The re⁃sults of this study have important guiding significance and reference value for the prevention and control of FPUF fires.