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EG与APP协同阻燃硬质聚氨酯泡沫塑料燃烧及热降解机理研究

Keywords: 硬质聚氨酯泡沫,可膨胀石墨,聚磷酸铵,阻燃,热降解

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Abstract:

将可膨胀石墨(EG)与聚磷酸铵(APP)复合用于阻燃硬质聚氨酯泡沫(RPUF),采用极限氧指数及锥形量热仪研究了EG/APP对RPUF燃烧性能的影响;通过扫描电镜、热失重分析及X射线光电子能谱表征了RPUF/EG/APP残炭的微观形貌、热降解行为及化学组成.结果表明,添加质量分数20%、质量比为7:3的EG/APP阻燃RPUF的协同效果最好,氧指数可达36.0%,热释放速率最小,有一定的抑制产烟和CO释放的作用.在阻燃RPUF燃烧过程中,EG热解残炭虽松散,但燃烧初期抑制烟气效果突出;APP残炭连续致密,但热稳定性不足,且易于生烟;而RPUF/EG/APP残炭隔热效果显著、抑制烟气效果较好.其作用机理与多磷酸渗入EG残炭,增加了炭层的耐热性及炭层表面N/C、P/C元素摩尔比的增加有关.

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