采用锥形量热仪、垂直水平燃烧试验仪、极限氧指数测试仪等手段研究玻璃纤维/环氧树脂复合材料在不同火灾环境下的燃烧特性。结果表明:随热辐射强度的增加,实验样品的平均点燃时间逐渐缩短,热释放速率和热释放速率峰值均增大,峰值出现时间提前,燃烧后残余率降低。由于玻璃纤维的抑制作用,复合材料总体质量损失幅度较小。实验样品在水平燃烧试验中未能点燃,在垂直燃烧试验中,平均烧焦长度48.3mm,移去火源后的平均焰燃时间为11.8s。氧指数试验显示,温度升高200℃后,其值降为室温氧指数的74.9%,表明在高温环境下复合材料更易被点燃。玻璃纤维的存在能够抑制环氧树脂的热解和燃烧。
The combustion characteristics of glass fiber/epoxy resin composites in different fire environments were tested by cone calorimeter,vertical/horizontal burning tester,and limiting oxygen index tester.The results showed that with the increase of thermal radiation intensity,the mean ignition time gradually decreased,the heat release rate and the peak value of the heat release rate both increased,the peak value appeared earlier,and the residual rate after combustion decreased.Due to the inhibition effect of glass fiber,the overall mass loss of the composite was small.The test sample failed to ignite in the horizontal combustion test.In the vertical combustion test,the average burning length was 48.3mm,and the average flame burning time after removing the ignition source was 11.8 seconds.The oxygen index test revealed that the oxygen index decreased to 74.9% of the room temperature oxygen index when the temperature increased by 200℃,indicating that the composite was more easily ignited at a high temperature.The presence of glass fiber could inhibit the pyrolysis and combustion of epoxy resin.
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基金资助
国家自然科学基金(61901283);辽宁省自然科学基金项目(201602567)
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