摘要
选择目前市场上最常见的热塑性装饰材料PP,PE,PS,PMMA和PVC,借助ISO9705全尺寸多功能热释放速率实验台对其火灾特性进行研究.研究发现,热塑性材料存在固体表面燃烧(PMMA和PVC)与流动燃烧(PP,PE和PS)2种燃烧形式,其中固体表面燃烧受壁面火蔓延控制,流动燃烧受油池火控制;通过对热解机理的探讨发现热解机理是控制材料燃烧形式的主要因素;通过材料流动能力、油池火发展和热释放速率的比较发现,流动能力对流动燃烧的影响非常大,材料流动能力越好越不利于油池火的形成与发展,所能达到的火灾规模越小.
The most common thermoplastic lining materials PP, PE, PS, PMMA and PVC were chosen to be tested using the ISO 9705 rig. It was observed that there existed two burning modes for the thermoplastics, one is solid surface burning, the other is melt flow burning, which is controlled by the surface flame spread and the development of pool fire on the floor beneath the bottom of the lining respectively. Through discussion, it was discovered that the thermal decomposition mechanisms control the burning modes of thermoplastic linings. Comparison of melt flow viscosity, development of pool fire and heat release rate indicated that viscosity has a great impact on melt flow burning behaviour, the lower the viscosity the more difficult for the pool fire to grow, and the smaller the peak heat release rate.
基金
国家自然科学基金重点项目(50536030)
国家“十一五”科技支撑计划(2006BAK06B02)资助
