Colored and paintable polyurethane dispersion coatings for sustainable building applications

Jeehoon Yu, Choyeon Park, Daeyul Kwon, Minji Choi, Jaeho Lee and Youngjae Yoo

Energy, 2025, vol. 330, issue C

Abstract: Innovations in passive daytime radiative cooling (PDRC) are driving sustainable architectural advancements. Traditionally, PDRC materials are effective within the 8–13 μm wavelength range, but challenges arise when solar irradiance (0.3–2.5 μm) surpasses their cooling capacity during the day. To address this, researchers are enhancing solar reflectance while maintaining cooling performance. This study presents the development of colored, paintable PDRC materials using polyurethane dispersions (PUDs) integrated with carefully selected pigments and glass bubbles. The pigments ensure vivid color representation, while the glass bubbles enhance scattering, optimizing solar reflectance. Our approach leverages the versatility of the PUD matrix to achieve both effective radiative cooling and a broad color spectrum. Experiments on 3D-printed model homes demonstrate that these cool paint coatings not only deliver significant temperature reductions but also maintain precise color consistency, offering a visually appealing and energy-efficient solution for architectural applications.

Keywords: CPPUD (colored and paintable polyurethane dispersion); CPPUD film; CPPUD coating; Radiative cooling (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:330:y:2025:i:c:s036054422502482x

DOI: 10.1016/j.energy.2025.136840

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