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通过锥形量热器试验、热重分析、拉曼光谱分析、氧指数、垂直燃烧试验及流变性能测试,研究了氰尿酸三聚氰胺(MCA)和氢氧化镁在无卤阻燃乙烯—醋酸乙烯共聚(EVA)混合物中的协效阻燃作用。锥形量热器试验结果表明,一定量的MCA可明显延缓材料的点燃时间,降低热释放速率;垂直燃烧和氧指数试验结果显示,MCA可有效改善材料的熔体滴落性能,增强火焰的自熄能力,但会降低材料的氧指数;流变性能测试结果表明,MCA的加入可明显降低材料的熔体粘度,改善材料的可加工性;热重分析结果显示,MCA可延缓EVA树脂的热氧降解并能促进炭层的生成;拉曼光谱证明了阻燃材料形成的炭层具有类石墨结构。MCA与氢氧化镁的协效阻燃效果归因于惰性气体保护层和炭层的形成。
The effects of melamine cyanurate (MCA) and magnesium hydroxide on the flame retardancy of ethylene-vinyl acetate-ethylene-vinyl acetate copolymer were studied by means of cone calorimeter test, TGA, Raman spectroscopy, oxygen index, vertical burning test and rheological property test. Copolymerization (EVA) in the flame retardant synergistic effect. Cone calorimeter test results show that a certain amount of MCA can significantly delay the ignition time of the material and reduce the heat release rate. The results of vertical combustion and oxygen index show that MCA can effectively improve the melt dripping performance of the material and enhance the flame Self-extinguishing ability, but will reduce the oxygen index of the material; rheological properties test results show that the addition of MCA can significantly reduce the melt viscosity of the material to improve the workability of the material; thermogravimetric analysis showed that MCA can delay the EVA resin Thermal decomposition of oxygen and can promote the formation of carbon layer; Raman spectroscopy proved that the flame retardant carbon layer formed by the material has a graphite-like structure. The synergistic flame retardant effect of MCA with magnesium hydroxide is attributed to the formation of inert gas protective layer and carbon layer.