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<p>Ultra-low near-infrared reflectance coatings with a reflectivity of less than 10% at 1.06&#xa0;µm are a research hotspot in the field of laser stealth. In this paper, various types of ultra-low near-infrared reflectance coatings were prepared using polyurethane (PU) as the binder and carbon nanotubes, carbon black, and graphite as the functional fillers. The effects of the types of carbon-based materials, the addition amount of fillers, and the particle size of graphite on the micro-structure, near-infrared reflectivity, and mechanical properties of the PU/carbon-based material composite coatings were systematically investigated. The results indicate that as the addition amount of carbon nanotubes increases, the reflectivity of the PU/carbon nanotubes composite coating towards 1.06&#xa0;µm near-infrared light generally shows a gradual upward trend. When the addition amount of carbon nanotubes reaches 4 wt.%, the reflectivity of the coating towards 1.06&#xa0;µm near-infrared light can be as low as 2.909%. As the addition amount of carbon black increases, the reflectivity of the PU/carbon black composite coating towards 1.06&#xa0;µm near-infrared light generally shows a gradual downward trend. When the addition amount of carbon black reaches 10 wt.%, the reflectivity of the coating towards 1.06&#xa0;µm near-infrared light can be as low as 2.319%. When the graphite addition amount is 8 wt.%, the reflectivity of the coating towards 1.06&#xa0;µm near-infrared light can be as low as 2.601%. Under the optimal conditions of carbon-based material addition amount, the coating can achieve an ultra-low near-infrared reflectivity of less than 3% for 1.06&#xa0;µm near-infrared light, demonstrating outstanding laser stealth performance. When the graphite particle size is 4000 mesh, the reflectivity of the PU/graphite composite coating to 1.06&#xa0;µm near-infrared light can reach its lowest level (2.601%), while the coating maintains outstanding mechanical properties.</p>

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Ultra-Low Near-Infrared Reflectivity and Mechanical Properties of Polyurethane/Carbon-Based Material Composite Coatings

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Guojuan Xu,
  • Weigang Zhang,
  • Jialun Zhang,
  • Zhifeng Xin

摘要

Ultra-low near-infrared reflectance coatings with a reflectivity of less than 10% at 1.06 µm are a research hotspot in the field of laser stealth. In this paper, various types of ultra-low near-infrared reflectance coatings were prepared using polyurethane (PU) as the binder and carbon nanotubes, carbon black, and graphite as the functional fillers. The effects of the types of carbon-based materials, the addition amount of fillers, and the particle size of graphite on the micro-structure, near-infrared reflectivity, and mechanical properties of the PU/carbon-based material composite coatings were systematically investigated. The results indicate that as the addition amount of carbon nanotubes increases, the reflectivity of the PU/carbon nanotubes composite coating towards 1.06 µm near-infrared light generally shows a gradual upward trend. When the addition amount of carbon nanotubes reaches 4 wt.%, the reflectivity of the coating towards 1.06 µm near-infrared light can be as low as 2.909%. As the addition amount of carbon black increases, the reflectivity of the PU/carbon black composite coating towards 1.06 µm near-infrared light generally shows a gradual downward trend. When the addition amount of carbon black reaches 10 wt.%, the reflectivity of the coating towards 1.06 µm near-infrared light can be as low as 2.319%. When the graphite addition amount is 8 wt.%, the reflectivity of the coating towards 1.06 µm near-infrared light can be as low as 2.601%. Under the optimal conditions of carbon-based material addition amount, the coating can achieve an ultra-low near-infrared reflectivity of less than 3% for 1.06 µm near-infrared light, demonstrating outstanding laser stealth performance. When the graphite particle size is 4000 mesh, the reflectivity of the PU/graphite composite coating to 1.06 µm near-infrared light can reach its lowest level (2.601%), while the coating maintains outstanding mechanical properties.