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首页> 外文期刊>Journal of Applied Polymer Science >Thermal decomposition kinetics of rigid polyurethane foam and ignition risk by a hot particle
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Thermal decomposition kinetics of rigid polyurethane foam and ignition risk by a hot particle

机译：硬质聚氨酯泡沫的热分解动力学和热粒子引起的着火危险

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摘要

Rigid polyurethane foam, one kind of building insulation material used in China, is prone to being ignited by hot particles from fireworks or welding processes and has been the fuel for some catastrophic fire accidents. Thermal decomposition has long been recognized to play an important role in the ignition and fire-spreading processes of materials, and thus, it is important to understand the behavior and kinetics of material decomposition. In this study, the characteristics of the thermal decomposition of polyurethane foam were investigated in an air atmosphere with nonisothermal thermogravimetry and differential scanning calorimetry (DSC). Model-free (isoconversional) methods and model-fitting methods were used to study the decomposition kinetics. The results reveal that the decomposition process of polyurethane foam in air presented three main stages: the loss of low-stability organic compounds (bond fission of the weakest link in the chain), oxidative degradation of organic components, and oxidative degradation of residue material. A scheme containing three consecutive reactions was proposed to describe the decomposition process, and good agreement was found between the experimental and simulated curves. The heat during decomposition was calculated from DSC measurement. On the basis of the kinetics and heat of decomposition, the critical conditions for a hot particle to ignite polyurethane foam was evaluated, and this was helpful for the understanding the ignition risk of polyurethane foam.
机译：硬质聚氨酯泡沫是在中国使用的一种建筑保温材料，容易被烟花或焊接过程中的热颗粒点燃，并已成为某些灾难性火灾事故的燃料。长期以来，人们一直认为热分解在材料的着火和蔓延过程中起着重要作用，因此，了解材料分解的行为和动力学非常重要。在这项研究中，采用非等温热重法和差示扫描量热法（DSC）研究了空气中聚氨酯泡沫的热分解特性。使用无模型（等转化）方法和模型拟合方法来研究分解动力学。结果表明，聚氨酯泡沫在空气中的分解过程主要表现为三个阶段：低稳定性有机化合物的损失（链中最薄弱环节的键裂变），有机成分的氧化降解以及残余物材料的氧化降解。提出了一个包含三个连续反应的方案来描述分解过程，并在实验和模拟曲线之间找到了很好的一致性。分解时的热量通过DSC测定算出。根据动力学和分解热，评估了热粒子点燃聚氨酯泡沫的临界条件，这有助于理解聚氨酯泡沫的着火风险。

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