废旧蜜胺塑料对聚丙烯的改性作用

Effects of Recycled Melamine-formaldehyde Plastic on Properties of Polypropylene

文章研究了废旧蜜胺塑料对聚丙烯的改性作用及效果,获得了较佳的制备配方和工艺,结果表明,随着废旧蜜胺塑料在体系中的含量增大,材料的拉伸强度、断裂伸长率、成型收缩率、冲击强度下降,但材料的刚性、热变形温度增大,熔体流动速率在废旧蜜胺含量20 wt%之前增大。重要的是,随着废旧密胺塑料添加量的增大,材料的氧指数增加,说明废旧密胺塑料的加入可以提高聚丙烯的刚性、尺寸稳定性、加工流动性和阻燃性。

The modification process of recycled melamine-formaldehyde（MF） plastic on polypropylene（PP） has been studied,and the optimal compounding parameters were obtained by twin extruding system in the paper.The results showed that with increasing of recycled MF plastic in PP,the tensile strength,elongation at break,molding shrinkage and impact strength decreased,the modulus,heat distortion temperature and melt flow rate increased,which indicates that the addition of recycled MF plastic can improve rigidity,heat resistance and flowability of PP.More importantly,the oxygen index of PP was increased with the addition of recycled MF plastic,which indicates that recycled MF plastic can improve the flame-retardant property of PP.