高填充量下氢氧化镁粒子尺寸对其填充聚丙烯材料性能影响

Effects of Particle Size on the Properties of Mg(OH)_2-Filled Polypropylene with High Filler Content

氢氧化镁是一种填充在高分子材料中的环境友好型无机阻燃剂,其形貌和尺寸会对高分子材料性能产生较大的影响。论文选取四种具有相同晶相、不同粒径尺寸的片状氢氧化镁,与聚丙烯(PP)材料熔融共混,制备氢氧化镁填充量为50%(wt)的阻燃PP规整样条。结果表明,尺寸不同的氢氧化镁均能在PP中高度分散,均可以较大地提高PP的阻燃性能,其中颗粒尺寸分布在150nm和大于800nm的氢氧化镁表现出较好的阻燃性能。但是氢氧化镁的填充使PP机械性能下降,其中具有800nm尺寸的氢氧化镁填充对PP机械性能破坏最小。综合比较,800nm左右的片状氢氧化镁填充的PP复合材料综合性能最优。

Magnesium hydroxide is an environmental friendly inorganic flame retardant filled in the polymer materials,its morphology and size can have a great influence on the properties of the doped polymer material.Four kinds of magnesium hydroxide particles with the same crystal phase and different particle sizes were prepared by coprecipitation method,and were doped in polypropylene（PP） with filling level of 50 %（wt）,respectively.Results reveal that the four kinds of magnesium hydroxide particles are highly dispersed in PP,and improve the flame retardancy of the PP.The Mg（OH）2 with particle size of ≤150 nm or ≥800 nm shows better flame-retardant effect on PP material.However,magnesium hydroxide doping will destroy the mechanical properties of PP.The Mg（OH）2 with the particle size of 800～1500 nm has a relatively better compatibility with PP,and the MH/PP composite shows the best mechanical properties.