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<p>Polyester (PET) textiles, which are widely used in interior furnishings, seating and clothing, are highly flammable and readily produce high temperature melt droplets, which present significant safety hazards in everyday use. To enhance the flame retardant and anti-melt drop properties of PET fabrics, the DOPO derivative (DTA) with benzimidazole structure was synthesised. Furthermore, the silica sol was prepared with the silane coupling agent KH602, which was used as an additive. When the total loading was 15% and the mass ratio of DTA to KH602 was 2:1, the LOI value of the flame-retardant PET fabric was 29.2%, and the melt drop was completely inhibited. In addition, the HRC and PHRR were reduced by 54% and 68%, respectively, compared to the untreated fabric. The thermogravimetric tests showed that the carbon content of the flame retarded PET fabric increased from 6.5 to 20.7% in the higher temperature zone. Scanning electron microscopy of the residual char showed that the flame retardant facilitated the formation of the expansive char layer on the PET fabric. The mechanism of the DTA/KH602 flame retarded PET fabric was investigated based on the results of thermal cracking gas chromatography, Raman spectroscopy, and X-ray photoelectron spectroscopy of the residual char. The results showed that DTA/KH602 exerted a flame retardant effect in both the gaseous and condensed phases. The expanded carbon layer, which is rich in phosphorus and silicon elements, acts as a support structure and inhibits the dripping of molten droplets.</p>

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Synthesis of a Dopo-Based Imidazole Compound and Analysis of its Flame Retardant Pet Fabric

  • 期刊论文

  • 发表日期：

    2025年5月15日

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  • Xin Yan,
  • Yong Shen,
  • Hong Pan,
  • Yihong Wang,
  • Lihui Xu,
  • Liming Wang

摘要

Polyester (PET) textiles, which are widely used in interior furnishings, seating and clothing, are highly flammable and readily produce high temperature melt droplets, which present significant safety hazards in everyday use. To enhance the flame retardant and anti-melt drop properties of PET fabrics, the DOPO derivative (DTA) with benzimidazole structure was synthesised. Furthermore, the silica sol was prepared with the silane coupling agent KH602, which was used as an additive. When the total loading was 15% and the mass ratio of DTA to KH602 was 2:1, the LOI value of the flame-retardant PET fabric was 29.2%, and the melt drop was completely inhibited. In addition, the HRC and PHRR were reduced by 54% and 68%, respectively, compared to the untreated fabric. The thermogravimetric tests showed that the carbon content of the flame retarded PET fabric increased from 6.5 to 20.7% in the higher temperature zone. Scanning electron microscopy of the residual char showed that the flame retardant facilitated the formation of the expansive char layer on the PET fabric. The mechanism of the DTA/KH602 flame retarded PET fabric was investigated based on the results of thermal cracking gas chromatography, Raman spectroscopy, and X-ray photoelectron spectroscopy of the residual char. The results showed that DTA/KH602 exerted a flame retardant effect in both the gaseous and condensed phases. The expanded carbon layer, which is rich in phosphorus and silicon elements, acts as a support structure and inhibits the dripping of molten droplets.