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<p>Here, in order to overcome the drawbacks of carbon spheres (CS) as a single additive with high smoke emission and limited thermal stability, we constructed a highly flame retardant carbon sphere composite (CS/PCP) with C-N-P structure by chemically bonding hexachlorocyclic triphosphate (HCCP) to the surface of CS using polydopamine (PDA) as the linking medium. Moreover, the TA-Fe complex layer was uniformly wrapped around the surface of CS/PCP to obtain CS/PCP@TA-Fe composite flame retardant. The complex flame retardant additives obtained were used for the improvement of thermal insulation properties of waterborne epoxy coatings. Fire resistance tests show that the CS/PCP@TA-Fe nanomaterials enhance the thermal insulation of EP to a minimum of 171.5&#xa0;°C on the backside of the samples, providing support for the high thermal insulation performance. In furnace tests, the CS/PCP@TA-Fe/EP composite coating demonstrated the highest swelling height (20.2&#xa0;mm) and the largest swelling n rate (15.66), far exceeding other coatings. Besides, the CS/PCP@TA-Fe/EP composite coating obtained the largest carbon residue (28.5%) due to the metal promoting the production of carbon. Observation of the carbon surface of the CS/PCP@TA-Fe/EP composite coating after combustion revealed that the residual carbon was dense and intact compared to that of the other coatings, indicating that it could effectively inhibit the entry of heat. Therefore, the successful development of this nanocomposite fire retardant coating contributes to the further development of waterborne epoxy intumescent fire retardant coatings.</p>

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Polyphenol tannic acid fixes iron ions on organophosphorus–nitrogen grafted carbon spheres surface for enhancing the fire resistance of waterborne epoxy coatings

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Lan Ma,
  • Bin Wang,
  • Chunlin Chen,
  • Xinyi Wang,
  • Xinyu Bai,
  • Liyun Zhang

摘要

Here, in order to overcome the drawbacks of carbon spheres (CS) as a single additive with high smoke emission and limited thermal stability, we constructed a highly flame retardant carbon sphere composite (CS/PCP) with C-N-P structure by chemically bonding hexachlorocyclic triphosphate (HCCP) to the surface of CS using polydopamine (PDA) as the linking medium. Moreover, the TA-Fe complex layer was uniformly wrapped around the surface of CS/PCP to obtain CS/PCP@TA-Fe composite flame retardant. The complex flame retardant additives obtained were used for the improvement of thermal insulation properties of waterborne epoxy coatings. Fire resistance tests show that the CS/PCP@TA-Fe nanomaterials enhance the thermal insulation of EP to a minimum of 171.5 °C on the backside of the samples, providing support for the high thermal insulation performance. In furnace tests, the CS/PCP@TA-Fe/EP composite coating demonstrated the highest swelling height (20.2 mm) and the largest swelling n rate (15.66), far exceeding other coatings. Besides, the CS/PCP@TA-Fe/EP composite coating obtained the largest carbon residue (28.5%) due to the metal promoting the production of carbon. Observation of the carbon surface of the CS/PCP@TA-Fe/EP composite coating after combustion revealed that the residual carbon was dense and intact compared to that of the other coatings, indicating that it could effectively inhibit the entry of heat. Therefore, the successful development of this nanocomposite fire retardant coating contributes to the further development of waterborne epoxy intumescent fire retardant coatings.