Preparation and Characterization of Low Infrared Emissive Aluminum/Waterborne Acrylic Coatings

Abstract

An aluminum/waterborne acrylic coating was developed by orthogonal experiments, and the gloss, emissivity, chromatic distortion, hardness, adhesion, impact resistance, and corrosion resistance of the coatings were examined. The results showed that the effect of drying time on the infrared emissivity of coatings was more significant than that of the Al powder concentration and nano-silica slurry. When the drying time was prolonged from 0.5 to 6.0 min, the gloss of the coating decreased slowly and the gloss remained low. The infrared emissivity first decreased and then increased. The infrared emissivity of coatings dried for 2.0 min was better. The L' value gradually decreased and showed a small change of range. With the increasing of the drying time, the hardness of the coating gradually decreased and was the highest at 0.5-2.0 min. The drying time had no effect on the adhesion level. The impact resistance of the coating was better during the drying period of 1.0-3.0 min. The corrosion resistance of the coating was better at 2.0 min. When the drying time was 2.0 min, the waterborne coating showed the better comprehensive performance. This study provides new prospects in using low infrared emissive coatings for infrared stealth and compatibility with visible light.

2D MXenes: the lowest-emissivity black materials

“…Besides the solar-thermal conversion, the low-emissivity black MXenes can bene t many other areas such as multispectral camou age and anti-counterfeiting. In conventional IR camou age coatings that are mostly made of metallic micro powders such as aluminum, both the high glossiness and high brightness limit their compatibility with visible and even near-IR light 22,48 . Figs.…”

“…The more generated thermal energy and larger temperature rises are highly bene cial for a lot of heat-driven applications including passive heating 17 , anti-icing/deicing 18 , steam generation 1,4 , lowtemperature batteries 19 , catalysis 9 , actuators 20 , and electricity generation 21 . Moreover, even with higher surface temperatures, low-emissivity black materials have the counter-intuitive ability to conceal themselves from IR detection due to their limited thermal radiation, showing great potential in multispectral (IR and visible) camou age assisted by their dark colors 8,22 .…”

The Properties of an Aluminum/UV-Curable, Infrared, Low-Emissivity Coating Modified by Nano-Silica Slurry

“…Some representative points were selected from the test. This method is scientific, fast, economical, and can reduce the workload [18]. The concentration of Al powder was 20.0%-40.0%; the concentration of nano-silica slurry was 2.0%-10.0%; and the UV-curing time was 120-360 s. The three-factor and two-level orthogonal experimental variables of the design are shown in Table 1.…”

“…When the Al powder concentration was 40.0%, the nano-silica slurry concentration was 2.0%, and UV-curing time was 180 s; the coating had low infrared emissivity and glossiness. The comparison results with other infrared low-emissivity coatings [18,[33][34][35][36] are shown in Table 9. The glossiness of Al/UV-curable coating modified by nano-silica slurry is lower than that of PU-based coating, which is similar to that of epoxy based coating and Al/waterborne acrylic coating.…”

Using Graphene-Based Composite Materials to Boost Anti-Corrosion and Infrared-Stealth Performance of Epoxy Coatings

“…Metal powders such as Al, Zn, Cu and Ni are often used as low-IR-emissivity pigments [ 29 , 30 , 31 ] for their high reflectivity, hence small absorption and low emissivity. Al powders are very frequently used owing to their low cost and low density [ 29 , 30 , 31 , 32 , 33 ]. In this work, graphene and Al powders are added to epoxy resin coatings to perform the functions of anticorrosion and low-emissivity pigment, respectively.…”