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<p>A novel aluminum dicyclohexyl hypophosphonate (ADCP) was synthesized via a free radical addition reaction under mild conditions. The product's structure was verified using infrared spectroscopy and nuclear magnetic resonance, the thermal stability of the product and its flame retardant effect on polyamide 66 (PA66) were tested, and it was used in combination with the co-effector melamine polyphosphate (MPP) to study its synergistic flame retardant effect and flame retardant mechanism. The results indicated that ADCP exhibited good thermal stability, as it only lost 5% of its mass at a temperature of 305&#xa0;℃. The flame retardancy test indicated that ADCP has excellent flame retardancy, the UL-94 achieving V-0 rating and the limiting oxygen index (LOI) to 30.8% when added at 15%. When combined with MPP as a coagent, the LOI of PA66/10%ADCP/5%MPP composite reached 34.6%, and UL-94 was rated V-0. The peak heat release rate and total heat release of PA66/ADCP/MPP and PA66/ADCP composites were significantly reduced compared to PA66 alone. The smoke suppression effect of the synergistic flame retardant material was better than that of the material with only ADCP, indicating that the two have good synergistic flame retardancy.</p>

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Synergistic flame retardant mechanism of PA66 with aluminum dicyclohexyl hypophosphonate and melamine polyphosphate

  • 期刊论文

  • 发表日期：

    2025年3月15日

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  • Xue Li,
  • Chaojie Li,
  • Long Wang,
  • Zi`ang Xia,
  • Baoming Xu,
  • Xinhui Wang,
  • Guorong Chen,
  • Heng Zhang

摘要

A novel aluminum dicyclohexyl hypophosphonate (ADCP) was synthesized via a free radical addition reaction under mild conditions. The product's structure was verified using infrared spectroscopy and nuclear magnetic resonance, the thermal stability of the product and its flame retardant effect on polyamide 66 (PA66) were tested, and it was used in combination with the co-effector melamine polyphosphate (MPP) to study its synergistic flame retardant effect and flame retardant mechanism. The results indicated that ADCP exhibited good thermal stability, as it only lost 5% of its mass at a temperature of 305 ℃. The flame retardancy test indicated that ADCP has excellent flame retardancy, the UL-94 achieving V-0 rating and the limiting oxygen index (LOI) to 30.8% when added at 15%. When combined with MPP as a coagent, the LOI of PA66/10%ADCP/5%MPP composite reached 34.6%, and UL-94 was rated V-0. The peak heat release rate and total heat release of PA66/ADCP/MPP and PA66/ADCP composites were significantly reduced compared to PA66 alone. The smoke suppression effect of the synergistic flame retardant material was better than that of the material with only ADCP, indicating that the two have good synergistic flame retardancy.