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<p>Polypropylene (PP) is flammable and releases a large amount of smoke, which limits its wide application in construction, electrical appliances and medical fields. In this study, the flame retardancy and mechanical properties of PP materials were significantly improved by innovating the intumescent flame retardant system. In this study, the modified piperazine pyrophosphate (MF@PAPP) with core–shell structure was prepared by microencapsulation technology, in which melamine formaldehyde (MF) resin serves as shell and piperazine pyrophosphate (PAPP) as core, and it was compounded with magnesium hydroxide (MH) to prepare flame retardant polypropylene (PP) materials. The effects of MF@PAPP and MH on the flame retardancy and mechanical properties of PP flame retardant materials were studied by various test methods. The results showed that when 23 wt% MF@PAPP and 2 wt% MH were added, the limiting oxygen index (LOI) value of PP was 30.4%, and UL-94 was V-0 rating. The total heat release (THR) and total smoke release (TSR) were reduced by 39.7% and 82.8%, respectively, compared with pure PP. The tensile strength and elongation at break reached 30.4 MPa and 141.5%, respectively. The combination of MF resin and PAPP improved the compatibility of PAPP in PP. At the same time, MF@PAPP had synergistic effects with MH to obtain better thermal stability and catalytic carbonization effects. In summary, this study provides a potential direction for the development of efficient flame retardants and the development of PP flame retardant materials.</p>

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Study on properties of melamine–formaldehyde resin-coated piperazine pyrophosphate and magnesium hydroxide co-efficient flame retardant polypropylene

  • 期刊论文

  • 发表日期：

    2025年7月3日

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  • Ming Li,
  • Hongxiang Ou,
  • Zhe Tu,
  • Wenqian Zhou,
  • Honglai Xue,
  • Fang Zhu

摘要

Polypropylene (PP) is flammable and releases a large amount of smoke, which limits its wide application in construction, electrical appliances and medical fields. In this study, the flame retardancy and mechanical properties of PP materials were significantly improved by innovating the intumescent flame retardant system. In this study, the modified piperazine pyrophosphate (MF@PAPP) with core–shell structure was prepared by microencapsulation technology, in which melamine formaldehyde (MF) resin serves as shell and piperazine pyrophosphate (PAPP) as core, and it was compounded with magnesium hydroxide (MH) to prepare flame retardant polypropylene (PP) materials. The effects of MF@PAPP and MH on the flame retardancy and mechanical properties of PP flame retardant materials were studied by various test methods. The results showed that when 23 wt% MF@PAPP and 2 wt% MH were added, the limiting oxygen index (LOI) value of PP was 30.4%, and UL-94 was V-0 rating. The total heat release (THR) and total smoke release (TSR) were reduced by 39.7% and 82.8%, respectively, compared with pure PP. The tensile strength and elongation at break reached 30.4 MPa and 141.5%, respectively. The combination of MF resin and PAPP improved the compatibility of PAPP in PP. At the same time, MF@PAPP had synergistic effects with MH to obtain better thermal stability and catalytic carbonization effects. In summary, this study provides a potential direction for the development of efficient flame retardants and the development of PP flame retardant materials.