5VA级环保阻燃PP复合材料的制备及研究

Preparation and Study of 5VA Environmentally Friendly Flame-Retardant PP Composites

采用双螺杆挤出机制备5VA级环保阻燃聚丙烯(PP)复合材料,研究阻燃剂添加量、阻燃剂表面处理、双螺杆螺纹组合对PP复合材料阻燃性能、物理力学性能和生产状况的影响。结果表明:阻燃剂含量为33%时,PP复合材料的阻燃性能达到5VA级,但使拉伸强度、断裂伸长率、冲击强度和熔体流动速率大幅度下降;硅烷偶联剂、钛酸酯偶联剂、硅烷处理阻燃剂提高了5VA级环保阻燃PP复合材料的韧性和流动性,硅蜡效果最好;在放大生产中,螺纹组合在下料端添加SK深螺纹元件压实物料,添加密炼、SME元件降低剪切促进分散,可有效解决5VA级阻燃PP复合材料发泡、牵条困难导致无法正常生产的问题。

A 5VA environmentally friendly flame retardant polypropylene(PP)composites was prepared using a twinscrew extrusion mechanism.The effects of flame retardant addition,flame retardant surface treatment,and twin-screw thread combination on the flame retardancy,physical and mechanical properties,and production status of PP composites were studied.The results show that when the flame retardant content is 33%,the flame retardancy of PP composites reaches 5VA level,but it significantly reduces the tensile strength,elongation at break,impact strength,and melt flow rate.Silane coupling agents,titanate coupling agents,and silane wax treated flame retardants have improved the toughness and flowability of 5VA environmentally friendly flame retardant PP composites,with the best effect of silicone wax.In scaled up production,SK deep thread components are added to the cutting end of the thread combination to compact the material,and internal mixing and SME components are added to reduce shear and promote dispersion,effectively solving the problems of foaming and difficult pulling of 5VA grade flame-retardant PP composites that prevent normal production.