Abstract
An Al powder filler, nano silica slurry and KH560 were mixed with a prepared waterborne UV-curable coating, and the coating was optimized by an orthogonal experiment. Influences of the Al powder concentration on the gloss, infrared emissivity, brightness, mechanical properties, corrosion resistance and other related properties of the coating were further discussed. The results show that the influence of the Al powder concentration on the gloss was more significant, followed by the UV curing time and nano silica slurry concentration. After studying the key role of the concentration of the Al powder, we found that as the concentration of the Al powder is augmented from 10.0% to 25.0%, the gloss lessened from 19.1% to 8.5%. As the concentration of the Al powder was augmented from 10.0% to 40.0%, the infrared emissivity lessened from 0.649 to 0.083 and the brightness L’ value of the coating was step-by-step augmented and inclined to be stable; in addition, the coating’s mechanical properties reached an excellent level. The coating containing 25.0% Al powder had the best corrosion resistance, surface morphology and comprehensive properties, which can potentially be used for infrared stealth technology.
Highlights
Infrared low emissivity coatings can benefit infrared stealth militarily, and reduce the harm of infrared light to the human body in daily life by virtue of its ability to reflect more and absorb less infrared light [1]
Compared with pure flaky aluminum, the Vis-NIR diffuse reflectance of the rGO-FAl complex powders was significantly decreased, which was good for the low gloss of the coating
The results investigated that the low emissivity coating displayed favorable thermal stability at a 1.5 Al/polysiloxane ratio and the coating infrared emissivity was about 0.25 at 600 ◦ C, which can show a good application prospect
Summary
Infrared low emissivity coatings can benefit infrared stealth militarily, and reduce the harm of infrared light to the human body in daily life by virtue of its ability to reflect more and absorb less infrared light [1]. Lv et al [3] fabricated a polydimethylsiloxane (PDMS)-modified polyurethane (PU)/Ag composite coating with super-hydrophobicity and low infrared emissivity via the glass rod scraping method. 50% concentration of Ag powder in the coating, the coating had a dense surface structure and the lowest infrared emissivity. He et al [4] fabricated a low infrared emissivity coating using graphene surface-modified flaky aluminum complex powders (rGO-FAl) as fillers. Compared with pure flaky aluminum, the Vis-NIR diffuse reflectance of the rGO-FAl complex powders was significantly decreased, which was good for the low gloss of the coating. The multilayer structure was optimized to realize a low emissivity filter at high temperatures, useful for military purposes
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