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<p>The objective of this work is to investigate the roles of ATH particle size in pyrolysis, ignition and burning behaviors of FR-cable jacket, as well as effects of NS additive. Series of TG-DSC and Cone experiments were carried out for FR-samples with ATH particle diameters of 1, 2, 5 and 8&#xa0;μm, respectively. The TG-DSC results indicate that the ATH particle size plays some role in the pyrolysis and heat release behaviors of micro FR-samples in air atmosphere. The DTG peak in the first stage is the largest for the case of 1&#xa0;µm ATH particles, and the heat flow of the cases with smaller ATH particles is a little larger. However, much more obvious effects of ATH particle size on the fire performance of FR-samples are illustrated by Cone experiments. The ignition delay times are longer for FR-samples with smaller ATH particles. The Cone results also indicate that both the HRRs and SRRs re-increase obviously latterly to another smaller peaks for the FR-samples with smaller ATH particle size in the continuous burning stage. It suggests that the FR-samples with larger ATH particles will burn more strongly and quickly. Particularly, the depression and delay effects of 3% NS additive on HRR and SRR of the samples with large ATH particles in the second stage possess stability and high efficiency, which provides novel insights and directions for the application of flame retardants. Finally, the swelling and cracking behaviors in Cone experiments are obviously stronger for the FR-samples with larger ATH particles, which is not only helpful for quicker release of pyrolysis gases and stronger burning but also reveals a connection between the microscopic structure and burning behaviors. The results and methodologies analyses are helpful for the fire modeling and optimal design of FR-cable jacket for manufacturers.</p>

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Roles of ATH particle size in fire performance of FR-cable jacket: pyrolysis, ignition and burning behaviors

  • 期刊论文

  • 发表日期：

    2025年1月30日

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  • Xiongjun Liu,
  • Qing Shen,
  • Canxing He,
  • Ye Yang,
  • Xiao Han,
  • Qiyuan Xie

摘要

The objective of this work is to investigate the roles of ATH particle size in pyrolysis, ignition and burning behaviors of FR-cable jacket, as well as effects of NS additive. Series of TG-DSC and Cone experiments were carried out for FR-samples with ATH particle diameters of 1, 2, 5 and 8 μm, respectively. The TG-DSC results indicate that the ATH particle size plays some role in the pyrolysis and heat release behaviors of micro FR-samples in air atmosphere. The DTG peak in the first stage is the largest for the case of 1 µm ATH particles, and the heat flow of the cases with smaller ATH particles is a little larger. However, much more obvious effects of ATH particle size on the fire performance of FR-samples are illustrated by Cone experiments. The ignition delay times are longer for FR-samples with smaller ATH particles. The Cone results also indicate that both the HRRs and SRRs re-increase obviously latterly to another smaller peaks for the FR-samples with smaller ATH particle size in the continuous burning stage. It suggests that the FR-samples with larger ATH particles will burn more strongly and quickly. Particularly, the depression and delay effects of 3% NS additive on HRR and SRR of the samples with large ATH particles in the second stage possess stability and high efficiency, which provides novel insights and directions for the application of flame retardants. Finally, the swelling and cracking behaviors in Cone experiments are obviously stronger for the FR-samples with larger ATH particles, which is not only helpful for quicker release of pyrolysis gases and stronger burning but also reveals a connection between the microscopic structure and burning behaviors. The results and methodologies analyses are helpful for the fire modeling and optimal design of FR-cable jacket for manufacturers.