木质素与氢氧化镁在聚乙烯-醋酸乙烯酯中的协同阻燃作用

F. Laoutid, V. Duriez, Loic Brison, S. Aouadi, H. Vahabi, P. Dubois
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引用次数: 11

摘要

摘要在本研究中,我们评估了氢氧化镁(MDH)和木质素在聚乙烯-醋酸乙烯酯(EVA)中形成互补阻燃作用的兴趣。选择木质素是因为木质素的成焦能力可以增强MDH的吸热效应。评价了磷酸铵对木质素进行化学改性以提高木质素的炭化效果。采用锥形量热仪、热解燃烧流量热仪(PCFC)和热重分析(TGA)对EVA复合材料的燃烧性能和热行为进行了表征。首先评价了木质素单独掺入对复合材料热性能和燃烧性能的影响。结果表明,木质素的掺入,无论其性质如何,在TGA分析中引起复合材料热稳定性的显著降低,在锥形量热计测试中引起点火时间(TTI)的显著降低。然而,观察到热释放率峰值(pHRR)显著降低,高于MDH。木质素与MDH的结合使pHRR进一步降低。此外,还得出结论,在获得更好的阻燃性能之前,不需要对木质素进行化学改性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synergistic flame-retardant effect between lignin and magnesium hydroxide in poly(ethylene-co-vinyl acetate)
Abstract In this study, we evaluated the interest of combining magnesium hydroxide (MDH) and lignin for developing complementary flame retardant actions in poly(ethylene-co-vinyl acetate) (EVA). Lignin was selected owing to its char forming ability thatwas supposed to reinforce the endothermic effect provided by MDH. The effect of lignin chemical modification by ammonium phosphate functions also evaluated as a way for enhancing its charring effect. Fire properties and thermal behavior of EVA composites were characterized using cone calorimeter, Pyrolysis Combustion Flow Calorimeter (PCFC) and thermogravimetric analysis (TGA). The effect of the incorporation of lignin alone on EVAcomposite thermal and fire behavior first evaluated. Results evidenced that the incorporation of lignin, whatever its nature, induced important reduction of composite thermal stability during TGA analysis as well as significant reduction of the time to ignition (TTI) in cone calorimeter test. However, a significant reduction of peak of heat release rate (pHRR), higher than that obtained with MDH was observed. The combination of lignin and MDH was led to further reduction of pHRR. Furthermore, it was concluded that the chemical modification of lignin is not required prior obtaining improved flame-retardant properties.
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