化工设计通讯

为改善木塑复合材料（WPC）的阻燃性能，拓宽WPC的功能性，以聚磷酸铵（APP）和氢氧化铝（ATH）为阻燃剂，通过高速混合和热压的方式制备出松木粉/PE复合材料，进而研究APP/ATH协效阻燃剂的不同质量比对WPC极限氧指数、垂直燃烧性能及燃烧残炭形貌的影响。结果表明，APP复配ATH样本的LOI均优于单独添加APP以及单独添加ATH样本的LOI。当m(APP)∶m(ATH)=2∶1时，样本的LOI值最高；当APP和ATH的质量比为2∶1和1∶2时，样本的垂直燃烧等级均达到V-0级。通过扫描电镜观察，样本中阻燃剂APP和ATH的质量比为2∶1时，炭层结构更加完整致密；样本中阻燃剂APP和ATH的质量比为1∶2时，样本燃烧后的表层结构变得较为松散，表面的缝隙和孔洞也相应增多。

Ammonium polyphosphate(APP) and aluminum hydroxide(ATH) were used as flame retardants in order to improve the flame retardancy of wood-plastic composites(WPC) and broaden the functionality of WPC.Wood powder/PE composites were prepared by high speed mixing and hot pressing, and the effects of different mass ratios of APP/ATH co-acting flame retardants on WPC limiting oxygen index, vertical combustion index and residual carbon morphology were studied.The results showed that,the LOI of APP combined with ATH samples is better than that of APP alone and ATH samples alone.When the mass ratio of APP to ATH was 2:1, the LOI value of the sample was the highest.At the mass ratio of APP to ATH of 2:1 and 1:2,the vertical combustion grade of the samples reached V-0.According to SEM, the carbon layer structure was more complete and dense when the mass ratio of flame retardant APP to ATH was 2:1.When the mass ratio of flame retardant APP and ATH in the sample was 1:2, the structure of the carbon layer after combustion of the composite material become relatively loose, and the cracks and holes on the surface of the material increased correspondingly.