聚磷酸铵/聚酰亚胺微胶囊化改性阻燃聚丙烯薄膜性能研究

Study on properties of flame-retardant polypropylene film modified by ammonium polyphosphate/polyimide microencapsulation

以聚磷酸铵(APP)为芯材、聚酰亚胺(PI)为囊材,通过低温喷雾干燥法制备微胶囊化改性APP阻燃剂。扫描电镜和红外光谱分析表明,改性后的APP分散性得到改善,并且PI较好地包覆在APP表面。将改性APP按照一定比例加入到PP树脂中制得薄膜,结果表明,改性APP的添加有提改善了薄膜的阻燃性能,极限氧指数比空白组最高提升了42.2%,UL-94达到V-0级,且热释放速率明显减缓,残炭量显著提升。此外,薄膜的机械性能、微观结构均未发生较大改变,可适用于物品的阻燃包装。

Microencapsulated modified APP flame retardants were prepared by low temperature spray drying method using ammonium polyphosphate(APP) as core and polyimide(PI) as the material.Scanning electron microscopy and infrared spectrum analysis showed that the APP dispersion was improved and PI was well coated on the surface of APP.The modified app was added into PP resin in a certain proportion to prepare a film.The results revealed that the addition of modified app improved the flame-retardant performance of the film, the limiting oxygen index increased by 42.2% compared with the blank group, UL-94 reached V-0,the heat release rate slowed down significantly, and the amount of residual carbon increased significantly.In addition, the mechanical properties and microstructure of the film did not changed greatly, so it could be used for flame retardant packaging of articles.