Abstract
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.
Highlights
This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum oxide nanoparticles for preparing thin polymeric heat insulation coatings
Reinforced composites using microfibers and ceramic particles in the form of thin layer and coatings, are effectively used to enhance the mechanical features[3,4] while reducing the emissivity coefficient and heat transfer that results in reducing the thermal energy and annual electricity c onsumption[5,6,7,8], while in buildings under different climate changes
This study indicated that surface with low emissivity can increase indoor air temperature vertical gradient, which is dependent on the time of day and outside weather conditions
Summary
This study aims to improve polyurethane-based coating by modified zirconium oxide and aluminum oxide nanoparticles for preparing thin polymeric heat insulation coatings. 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 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). A testing method has been developed to evaluate the energy performance and sustainability of innovative new products, which are known as cool c olors[13] These products were the component of selective materials (high absorption coefficient in the visible light region and high reflectance in the infrared light region), and they had both the aesthetics and cooling capabilities parameters in construction application.
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