核心层厚度对聚乙烯基铝塑板燃烧特性影响研究

Study on the influence of core layer thickness on combustion characteristics of polyethylenebased aluminum composite panel

通过锥形量热仪研究了不同核心层厚度聚乙烯基铝塑板的燃烧特性。选用35、50、65、80 kW/m2共4种热流强度,得到不同核心层厚度铝塑板的点燃特性、火灾风险和烟气毒性等。结果发现:聚乙烯基铝塑板符合热薄型材料点燃规律,3、4、5 mm厚核心层铝塑板临界点燃热流强度的推导值分别为33.9、25.1、9.9 kW/m2。铝塑板燃烧的热释放速率随热流强度增加而明显增加,且有向双峰发展的趋势。随着热流强度和铝塑板核心层厚度增加,聚乙烯基铝塑板的火灾性能指数(FPI)由41迅速下降到0.14,火灾蔓延指数(FGI)则由0.02迅速增加到3.19,CO释放速率也迅速增大,导致火灾危险性大幅增加。

The combustion characteristics of polyethylene-based aluminum composite panels with different core layer thicknesses were studied by using cone calorimeter.Four heat fluxes of 35,50,65,and 80 kW/m2 were selected to obtain the ignition characteristics,fire risk,and smoke toxicity.The results showed that polyethylene-based aluminum composite panels conform to the ignition law of thermal thin materials,and the derived critical ignition heat fluxes of 3,4,5 mm thick core layers are 33.9,25.1,9.9 kW/m2,respectively.With the increase of heat flux,the heat release rate of aluminum composite panels of each thickness increases obviously,and the heat release rate tends to double peak.With the increase in heat flux and core layer thickness,there was a rapid decrease in the Fire Performance Index(FPI)from 41 to 0.14,accompanied by a rapid increase in the Fire Growth Index(FGI)from 0.02 to 3.19,and the CO release rate also rapidly increases,resulting in a significant increase in fire hazard.