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Studies on melt flow properties during capillary extrusion of PP/Al(OH)3/Mg(OH)2 flame retardant composites

机译:PP / Al(OH)3 / Mg(OH)2阻燃复合材料毛细管挤出过程中的熔体流动特性研究

摘要

The apparent melt shear viscosity of polypropylene (PP) composites filled with aluminium hydroxide (Al(OH)3) and magnesium hydroxide (Mg(OH)2) was measured by means of a melt flow rate instrument under experimental conditions of temperature ranging from 170 to 195 °C and load varying from 2.16 to 12.5 kg, to identify the effects of particle size and content. The results showed that the melt shear flow of the composites obeyed the power law under the experimental conditions, the dependence of the melt apparent shear viscosity (ηa) on temperature was consistent with the Arrhenius equation, and the sensitivity of the ηa for the composite melts to temperature increased with addition of flame retardant. The ηa of the composites decreased with increasing apparent shear rate. The ηa increased with an increase of the content of flame retardant, but this rate of increase decreased with a rise of temperature or load. When the particle size of flame retardant was smaller than 5 μm, the ηa of the composites increased with increase of particle size of flame retardant, and then reduced with a further increase of particle size of flame retardant.
机译:通过熔体流动速率仪,在170℃的实验条件下测量填充有氢氧化铝(Al(OH)3)和氢氧化镁(Mg(OH)2)的聚丙烯(PP)复合材料的表观熔体剪切粘度。到195°C,负荷从2.16到12.5 kg不等,以确定颗粒大小和含量的影响。结果表明,在实验条件下,复合材料的熔体剪切流动服从幂律,熔体的表观剪切粘度(ηa)对温度的依赖性与Arrhenius方程一致,ηa对复合熔体的敏感性加入阻燃剂会使温度升高。复合材料的ηa随着表观剪切速率的增加而降低。 ηa随着阻燃剂含量的增加而增加,但是这种增加速率随温度或负荷的增加而降低。当阻燃剂的粒径小于5μm时,复合物的ηa随着阻燃剂的粒径增加而增加,然后随着阻燃剂的粒径进一步增加而减小。

著录项

  • 作者

    Yang J; Liang JZ; Tang CY;

  • 作者单位
  • 年度 2009
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类

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