Preparation and characterization of a greenish yellow lackluster coating with low infrared emissivity based on Prussian blue modified aluminum

• PB surface modified Al powders were synthesized by a traditional wet chemical method.
• PB/Al coatings have low surface glosses and outstanding mechanical properties.
• PB/Al coatings have low infrared emissivities within the wavelength range of 8–14 μm.
• The more metallic filler contacts in the PB/Al coating lead to lower emissivity.

Greenish yellow lackluster coatings with low infrared emissivity were prepared by Prussian blue (PB) surface modified Al powders and polyurethanes. The morphology and component of PB/Al powder were characterized by scanning electron microscopy and X-ray diffractometer. The infrared emissivity, surface gloss and visible light color of PB/Al composite coating were investigated by an infrared emissometer, a glossmeter and a colorimeter, respectively. Mechanical properties of PB/Al composite coatings were studied by using adhesion test and impact strength test. The results indicate that PB/Al powder decreases not only the gloss of the coating, but also its emissivity within the wavelength range of 8–14 μm. The composite coatings have good adherence and impact strength at PB/Al content below 50 wt.%, and then the mechanical properties decrease in the PB/Al content range from 50 wt.% to 60 wt.%. By comparing PB/Al composite coating and Al powder tinting coating with the same color and surface gloss, PB/Al composite coating exhibits significant lower infrared emissivity, which is attributed to closer inter-powder distances of metallic fillers and higher electrical conductivity in the coating.

Greenish yellow PB/Al powders were successfully prepared, and the infrared emissivity of PB/Al composite coating is prominent lower comparing to Al powder tinting coating within the wavelength range of 8–14 μm.Figure optionsDownload as PowerPoint slide