玻纤增强阻燃共聚尼龙66复合材料的阻燃性能研究

Study on the Flame Retardancy of Glass Fiber Reinforced Flame Retardant Copolyamide 66 Composites

采用双螺杆挤出机,将玻纤(GF)、玻纤分散润滑剂(TAF)、抗氧剂等添加到阻燃共聚尼龙66(FRPA66)中制备了玻纤增强阻燃共聚尼龙66(GF/FR-PA66)新型复合材料。通过场发射扫描电镜(SEM)、热重分析仪(TGA)、氧指数仪及垂直燃烧仪,研究了玻纤在阻燃尼龙66基体中的分散性、复合材料的热稳定性、阻燃性及残炭形貌。结果表明:随着含量的增加,玻纤在复合材料中的分散性越好,提高了复合材料的热稳定性,但降低了氧指数和垂直燃烧等级;与FR-PA66相比,添加25%玻纤的GF/FR-PA66残炭表面炭层疏松、致密度减小,炭层的隔氧、隔热作用降低。

The glass fiber （GF）, TAF and antioxidants were added into the flame-retardant copolymer nylon 66 （FR-PA66） to prepare glass fiber reinforced flame retardant copolyamide 66 （GF/FR-PA66） composite materials by a twin-screw extruder. The dispersion property of glass fiber in the flame retardant nylon 66 matrix, thermal stability, flame retardancy and residual char morphology of the composites were investigated by field emission scanning electron microscope （SEM）, thermogravimetric analysis （TGA）, oxygen index instruments and vertical burning instrument. The results show that with the rise of glass fiber content, a good dispersion property was obtained and the thermal stabilities of the composites were improved, but the value of oxygen index and vertical combustion grade decreased. Compared with FR- PA66, the surface of residual char of GF/FR-PA66 in which 25% of GF was added became looser and the char layer density decreased, leading to a decrease in oxygen isolation and thermal insulation functions of char layer.