聚氨酯泡沫材料阴燃发展过程的特性分析

分析对比了相同加热条件下的聚氨酯泡沫材料在有氧和无氧气氛下的升温过程,并对不同加热条件下的聚氨酯泡沫材料的阴燃传播速度进行研究.结果表明:沿着反应进行的方向,分离点的温度越来越低,不同热流条件下的温度分离曲线斜率在实验稳定发展段的变化规律表现得很相似,并在分离点出现后,有氧气氛中的该位置温度在短时间内急剧上升;在阴燃不稳定传播阶段时,热解前锋的速度小于氧化前锋的速度,在稳定传播阶段时,热解前锋速度与氧化前锋速度近乎相等.

Characteristic Analysis for Smoldering Process of Polyurethane Foam

In this paper, an analysis of the temperature-rising processes of polyurethane foam placed in oxygenated and deoxygenated atmosphere respectively but under the same heat flux was made. And give a close study of the smoldering velocities of polyurethane foam under different heat fluxes. The result shows the temperature of separation point gets lower and lower as the smolder reaction propagates. And the rules of curve slope of separation temperature of the different heat fluxes in steady reaction zone are quite similar. Furthermore, after the separation point appears, the temperature of the very point in oxygenated atmosphere rises steeply in a short time. In the unsteady stage of smolder, the velocity of pyrolysis front is slower than that of oxidation front. However in the steady stage of smolder, their propagation velocities are approximately the same for a given heat flux.