Rheological behavior of spectrally selective coatings for polymeric solar absorbers

Mihelčič, Mohor (author), Klanjšek Gunde, Marta (author), Slemenik Perše, Lidija (author)

Since the world’s energy demands are growing rapidly, there is a constant need for new energy systems. One of the cleanest, most abundant, and renewable natural resources available is solar energy; therefore, the development of surfaces with high absorption of solar radiation is increasing. To achieve the best efficiency, such surfaces are coated with spectrally selective coatings, which are strongly influenced by the pigments and resin binders. Spectrally selective paints have a very specific formulation, and since the applied dry coatings should exhibit high spectral selectivity, i.e., high solar absorptivity and low thermal emissivity, the rheological properties of liquid paints are of great importance. In the present work, we studied the effect of the rheological properties of liquid thickness-insensitive spectrally selective (TISS) paints on the spectral selectivity and adhesion of dry coatings on a polymeric substrate. The results showed that the functional and adhesion properties of dry coating on polymeric substrates is strongly dependent on the rheological properties of the binder and catalyst used for the preparation of the liquid paints. It was shown that the paints with good spectral selective properties (thermal emissivity e$_T$ < 0.36 and solar absorptivity a$_S$ > 0.92) and good adhesion (5B) can be prepared for polymer substrates.

• Language: English
• Keywords: spectrally selective paints, polymer solar absorbers, rheological characterization
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: 15 str.
• Numbering: Vol. 12, iss. 3, art. 388
• PID: 20.500.12556/RUL-135895
• UDC: 532.135:678
• ISSN on article: 2079-6412
• DOI: 10.3390/coatings12030388
• COBISS.SI-ID: 102868227
• Publication date in RUL: 31.03.2022

Record is a part of a journal

• Title: Coatings
• Shortened title: Coatings
• Publisher: MDPI AG
• ISSN: 2079-6412
• COBISS.SI-ID: 523035673

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 15.03.2022

Secondary language

• Language: Slovenian
• Keywords: spektralno selektivni premazi, polimerni sončni absorberji, reološka karakterizacija

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0264
• Name: Trajnostni polimerni materiali in tehnologije

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0393
• Name: Napredni materiali za nizkoogljično in trajnostno družbo