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Boosting the NIR reflective properties of perylene organic coatings with thermoplastic hollow microspheres: Optical and structural properties by a multi-technique approach.

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Title: Boosting the NIR reflective properties of perylene organic coatings with thermoplastic hollow microspheres: Optical and structural properties by a multi-technique approach.
Authors: Minei, Pierpaolo1 (AUTHOR), Lessi, Marco1 (AUTHOR), Contiero, Luca2 (AUTHOR), Borsacchi, Silvia3,4 (AUTHOR), Martini, Francesca1,4 (AUTHOR), Ruggeri, Giacomo1,4 (AUTHOR), Geppi, Marco1,4 (AUTHOR), Bellina, Fabio1 (AUTHOR), Pucci, Andrea1,4 (AUTHOR) andrea.pucci@unipi.it
Source: Solar Energy. Mar2020, Vol. 198, p689-695. 7p.
Subjects: Organic coatings, Perylene, Acrylic coatings, Optical properties, Microspheres, Reflectance, Time management
Abstract: • Paliogen black was utilized as cool organic pigment. • Waterborne acrylic coatings were obtained on white and black substrates. • Thermoplastic hollow microspheres were utilized to boost NIR reflectivity. • SR measurements allowed to determine the cooling features of the prepared coatings. This study reports for the first time the use of thermoplastic hollow microspheres (THM) in combination with a perylene bisimide pigment (Paliogen® Black L0086 (P-black)) for the preparation of acrylic coatings with near-infrared (NIR) reflecting and cooling characteristics. VIS-NIR spectra showed that P-black solid dispersions provide reflectance values in agreement with the P-black content and its crystalline nature. The introduction of THM with average diameter of 25 ± 5 μm with the same weight content of P-black did not substantially affect the crystalline nature of the pigment within the organic coating even if a decreasing of the long range order in the molecular packing of the perylene chromophores emerged from XRD and solid-state NMR investigations. Noteworthy, the addition of the THM successfully contributed in the exponential raising of the solar reflectance (SR) of coated black substrates, i.e. reaching up to the 22% at the highest organic layer thickness of 255 μm. The effective combination between THM and P-black was well reflected on the temperature of the back side of the coated surface after irradiation with a solar simulator, i.e. with a maximum cooling effect of about 6 °C. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:• Paliogen black was utilized as cool organic pigment. • Waterborne acrylic coatings were obtained on white and black substrates. • Thermoplastic hollow microspheres were utilized to boost NIR reflectivity. • SR measurements allowed to determine the cooling features of the prepared coatings. This study reports for the first time the use of thermoplastic hollow microspheres (THM) in combination with a perylene bisimide pigment (Paliogen® Black L0086 (P-black)) for the preparation of acrylic coatings with near-infrared (NIR) reflecting and cooling characteristics. VIS-NIR spectra showed that P-black solid dispersions provide reflectance values in agreement with the P-black content and its crystalline nature. The introduction of THM with average diameter of 25 ± 5 μm with the same weight content of P-black did not substantially affect the crystalline nature of the pigment within the organic coating even if a decreasing of the long range order in the molecular packing of the perylene chromophores emerged from XRD and solid-state NMR investigations. Noteworthy, the addition of the THM successfully contributed in the exponential raising of the solar reflectance (SR) of coated black substrates, i.e. reaching up to the 22% at the highest organic layer thickness of 255 μm. The effective combination between THM and P-black was well reflected on the temperature of the back side of the coated surface after irradiation with a solar simulator, i.e. with a maximum cooling effect of about 6 °C. [ABSTRACT FROM AUTHOR]
ISSN:0038092X
DOI:10.1016/j.solener.2020.02.017