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<p>Polyvinylidene fluoride (PVDF) is suitable as a base material for electromagnetic-shielding applications due to its excellent properties such as oxidation resistance, high-temperature resistance, corrosion resistance, and dielectric performance. Moreover, the industrial production of this material is characterized by large-scale operations and mature manufacturing processes, which makes it a common plastic product. Its low cost and easy availability of raw materials foster its application in electromagnetic-shielding materials. PVDF was used as the base material in the work, with magnetite (Ma)/coking coal (Coke) employed as filler particles. A ternary composite thin film, Ma/Coke/PVDF (MCP), was prepared using a simple solvent method and hot-pressing process. Sample MCP-10 demonstrated effective electromagnetic protection at the broad frequency of 18–26.5&#xa0;GHz, with the average total shielding effectiveness (SE) of 33.58&#xa0;dB. This achievement applied porous pellet-structured Ma/Coke powders to film materials. Ma/Coke powders exhibited great application potential due to their surprising reflection loss and impressive effective bandwidth. Therefore, film-like or coating-like new materials were obtained by the secondary combination of powder materials with polymer materials. The MCP ternary composite film material could achieve electromagnetic protection and maintain the low cost and scale production of mineral materials. This cost-effective, efficient, eco-friendly, and scalable preparation method for natural mineral-based electromagnetic-shielding materials presents a new feasibility option for the functional application of natural mineral materials, expanding their utility across a wider range of applications.</p>

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Natural magnetite and coking coal composite films with excellent electromagnetic-shielding properties

  • 期刊论文

  • 发表日期：

    2026年1月10日

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  • Jianying Deng,
  • Hui Xu,
  • Qizheng Qin,
  • Jiushuai Deng,
  • Zhongyi Bai,
  • Biao Zhao

摘要

Polyvinylidene fluoride (PVDF) is suitable as a base material for electromagnetic-shielding applications due to its excellent properties such as oxidation resistance, high-temperature resistance, corrosion resistance, and dielectric performance. Moreover, the industrial production of this material is characterized by large-scale operations and mature manufacturing processes, which makes it a common plastic product. Its low cost and easy availability of raw materials foster its application in electromagnetic-shielding materials. PVDF was used as the base material in the work, with magnetite (Ma)/coking coal (Coke) employed as filler particles. A ternary composite thin film, Ma/Coke/PVDF (MCP), was prepared using a simple solvent method and hot-pressing process. Sample MCP-10 demonstrated effective electromagnetic protection at the broad frequency of 18–26.5 GHz, with the average total shielding effectiveness (SE) of 33.58 dB. This achievement applied porous pellet-structured Ma/Coke powders to film materials. Ma/Coke powders exhibited great application potential due to their surprising reflection loss and impressive effective bandwidth. Therefore, film-like or coating-like new materials were obtained by the secondary combination of powder materials with polymer materials. The MCP ternary composite film material could achieve electromagnetic protection and maintain the low cost and scale production of mineral materials. This cost-effective, efficient, eco-friendly, and scalable preparation method for natural mineral-based electromagnetic-shielding materials presents a new feasibility option for the functional application of natural mineral materials, expanding their utility across a wider range of applications.