硅烷交联无卤阻燃PP/POE复合材料的制备和性能

采用双螺杆挤出机和单螺杆挤出机两步熔融共混的方法，制备了硅烷接枝交联聚丙烯(PP)/乙烯辛烯共聚物(POE)/氢氧化镁（MH）/氢氧化铝（ATH）复合材料，并研究了不同硅烷接枝PP/POE共混物的效率和硅烷交联阻燃PP/POE复合材料的力学、热延伸、热失重和阻燃等性能。结果表明，PP/POE/MH/ATH/硅烷偶联剂A-151质量比为50∶50∶（95~47.5）∶（0~47.5）∶3.0时，复合材料的热延伸变形率≤25 %，冷却后永久变形率≤4 %；阻燃剂用量一定时，硅烷交联PP/POE/MH/ATH的极限氧指数随ATH含量增加而小幅度提高；PP/POE/MH/ATH复合材料的热稳定性低于PP/POE/MH复合材料；PP/POE/MH、PP/POE/MH/ATH、PP/POE/ATH的生烟速率依次变大。

Preparation and Properties of Silane-crosslinked Halogen-free Flame Retardant Polypropylene/Poly(ethylene-1-octene) Compounds

Silane-crosslinked halogen-free flame-retardant polypropylene(PP)/poly(ethylene 1-octene(POE) composites were prepared by a two-step melt extrusion method using magnesium hydroxide(MH) and aluminum hydroxide（ATH）as flame retardants. The graft ratio of silane, mechanical properties, thermal performance and flame retardancy of the resulting compounds were extensively investigated. The results indicated that the compounds achieved a creep elongation lower than 25 % and an eternal deformation ratio lower than 4 % at the PP/POE/MH/ATH/silane weight ratio of 50/50/95~47.5/0~47.5/3. The limiting oxygen index of the compounds was improved slightly with increasing ATH content at a fixed content of the flame retardants. The compounds containing MH exhibited a higher thermal stability than those containing MH and ATH. The decreasing smoke release rate was also found to show a variation trend in an order of PP/POE/ATH compounds>PP/POE/MH/ATH compounds>PP/POE/MH compounds.