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NIR reflective surfaces based on organic coatings

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Chemistry meets Industry & Society (CIS2019)

WS4 XY00

NIR reflective surfaces based on organic coatings

Andrea Puccia, Pierpaolo Mineia, Giacomo Ruggeria, Marco Geppia, Fabio Bellinaa, Bruno

Maravigliab, Valter Fontanib, Andrea Pallesic, Luca Contierod

a Dipartimento di Chimica e Chimica Industriale, Università di Pisa, via Moruzzi 13, 56124 Pisa, Italy; b

IEXI SRL, Piazza Paolo Uccello 5, 50142 Firenze, Italy; c TECNOCHIMICA S.P.A Via Del Salice 16/18

56022 Castelfranco Di Sotto, Pisa, Italy; d CROMOLOGY ITALIA S.P.A. Via 4 Novembre 4, 55016 Porcari,

Lucca, Italy; andrea.pucci@unipi.it

Poor attention has been paid so far to the 50% of NIR radiation flux (750-2500 nm), coming from direct, diffused and reflected sun radiation, which contributes to increase the temperature in urban areas. To reduce the increasing demand for energy consumption for air conditioning or to produce cool fabrics, there is a need for NIR reflective pigments and coatings formulation since reflecting the sun’s radiation minimizes the amount of energy absorbed by the surface (1). To date, NIR reflectivity is obtained with the use of inorganic pigments such as expensive metal oxides and complexes (2). The key to obtaining innovative cool pigments is instead the production of NIR reflective organic molecules to avoid the inconveniences related to costs, environmental impacts, while maintaining the efficiency and color provided by the current inorganic pigments. This work aims at the preparation of organic coatings containing designed perylene- and naphthalene-bis imides properly functionalized with peripheral moieties able to confer the desired color and NIR reflectivity according to the π-π stacking behavior of the extended conjugated nuclei (3). Notably, different pigment formulations are prepared from commercially available resin dispersions in water and the NIR reflective features of the derived coatings are discussed in terms of the utilized pigments, additives and their content, and compared with those of commercially available inorganic benchmarks.

Acknowledgements

This work was supported by the Tuscany region POR FESR 2014-2020 COOLSUN - New NIR-reflective “cool” organic pigments

References: 1. I. Hernández-Pérez, G. Álvarez, J. Xamán, I. Zavala-Guillén, J. Arce and E. Simá, Energy and Buildings, 2014, 80, 81-105. 2. R. Levinson, P. Berdahl and H. Akbari, Solar Energy Materials and Solar Cells, 2005, 89, 351-389. 3. M. Mazhar, M. Abdouss, K. Gharanjig and R. Teimuri-Mofrad, Progress in Organic Coatings, 2016, 101, 297-304.

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