This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum oxide nanoparticles for preparing thin polymeric heat insulation coatings. In the first step, the nanoparticles were chemically modified with the silane coupling agent. Then, three different weight percent of modified nanoparticles (1, 3, and 5% w/w) were mixed with polyurethane, to prepare the nanocomposites, which were coated on metallic plate samples. Then, these plates are used to measure the radiation heat transfer coefficients, absorption coefficient in a region of short wavelengths (UV/VIS/NIR), the emissivity coefficient, and thermography of the samples in a region of long wavelengths (IR). Results showed that by adding the modified nanoparticles to the polyurethane matrix, absorption was decreased and the emissivity coefficient was increased. According to the thermography results, it was observed that the surface temperature of both samples with 3% w/w of nanoparticles had the minimum temperature compare to others. Minimum heat surface observed for 3% w/w of modified nano zirconium oxide.

Department of Color Imaging and Color Image Processing Institute for Color Science and Technology Tehran 1668836471 Iran

Department of Mechanical Engineering Abadan Branch Islamic Azad University Abadan 6317836531 Iran

Department of Resin and Additives Institute for Color Science and Technology Tehran 1668836471 Iran

Department of Thermo Fluids Faculty of Mechanical Engineering University of Kashan Kashan 8731753153 Iran

Institute for Nanomaterials Advanced Technologies and Innovation 460 01 Liberec Czech Republic

Technical University of Liberec 460 01 Liberec Czech Republic

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