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<p>The increasing severity of electromagnetic pollution has prompted the development of various conductive polymer composite materials for electromagnetic protection in recent years. However, research specifically focused on conductive polymer composite coatings remains limited. In this study, we prepared two types of conductive coatings, which are designated as UP and UC coatings, using waterborne polyurethane (WPU) combined with polyaniline (PANI) or multi-walled carbon nanotubes (MWCNT) through a standard preparation method involving paint formulation and air spraying. We conducted a thorough evaluation and comparison of the performance of these coatings. Both UP and UC coatings exhibited commendable mechanical properties, including adhesion, impact strength, and hardness. Notably, the UC coatings demonstrated higher conductivity and electromagnetic interference (EMI) shielding capabilities compared to the UP coatings. Specifically, the UP-20 coating achieved a high conductivity of 97.79 S m<sup>−1</sup>, a moderate total shielding effectiveness (SE<sub>T</sub>) of 7.47&#xa0;dB, and an impressive specific shielding effectiveness (SSE) of 983.7&#xa0;dB cm<sup>2</sup>&#xa0;g<sup>−1</sup> at 8.2&#xa0;GHz. Overall, the UP coatings show significant potential and advantages for everyday applications in electromagnetic protection.</p>

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Preparation and performance of waterborne polyurethane composite coatings for electromagnetic interference shielding

  • 期刊论文

  • 发表日期：

    2025年1月31日

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  • Yue Zhang,
  • Zhengxun Liu,
  • Yunhua Han,
  • Shiyang Zhu,
  • Jiaqi Zhuo,
  • Yizeng Di,
  • Xihao Ling,
  • Hongyan Yao,
  • Shaowei Guan

摘要

The increasing severity of electromagnetic pollution has prompted the development of various conductive polymer composite materials for electromagnetic protection in recent years. However, research specifically focused on conductive polymer composite coatings remains limited. In this study, we prepared two types of conductive coatings, which are designated as UP and UC coatings, using waterborne polyurethane (WPU) combined with polyaniline (PANI) or multi-walled carbon nanotubes (MWCNT) through a standard preparation method involving paint formulation and air spraying. We conducted a thorough evaluation and comparison of the performance of these coatings. Both UP and UC coatings exhibited commendable mechanical properties, including adhesion, impact strength, and hardness. Notably, the UC coatings demonstrated higher conductivity and electromagnetic interference (EMI) shielding capabilities compared to the UP coatings. Specifically, the UP-20 coating achieved a high conductivity of 97.79 S m−1, a moderate total shielding effectiveness (SET) of 7.47 dB, and an impressive specific shielding effectiveness (SSE) of 983.7 dB cm2 g−1 at 8.2 GHz. Overall, the UP coatings show significant potential and advantages for everyday applications in electromagnetic protection.