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| Preparation and Infrared Emissivity of Polyurethane/Composite Metal Pigments Coatings |
| ZHANG Weigang**, XU Guoyue, DUAN Kaige, DING Ruya, QIAO Jialiang |
| (College of Material Science & Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106) |
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Cite this article:
ZHANG Weigang**,XU Guoyue,DUAN Kaige,DING Ruya,QIAO Jialiang. Preparation and Infrared Emissivity of Polyurethane/Composite Metal Pigments Coatings. Chinese Journal of Materials Research, 2013, 27(1): 49-52.
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Abstract ABSTRACT Polyurethane (PU)/AlBronze composite coatings were prepared by using flaky Al and bronze powders and PU as composite pigments and adhesives, respectively. The microstructure and infrared emissivity of the coatings were systematically investigated by scanning electron microscopy, infrared emissometer and theoretical simulation. The results show that PU/AlBronze composite coatings have similar one-dimensional photonic structural characteristics. The infrared emissivity of PU/AlBronze composite coatings with composite metal pigments is as low as 0.186 at the pigments content of 40%, and it is significantly lower than that of PU/Al and PU/Bronze composite coatings with single metal pigments. The reasons for this phenomenon are: (1) the reflection spectra of one-dimensional photonic structure in PU/AlBronze composite coatings have multiple reflection peaks; (2) comparing to PU/Bronze composite coatings with high density metal pigments, PU/AlBronze composite coatings have lower thickness of surface resin layer, reducing the emissivity increment of the coatings significantly.
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