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Sustainable, Fluorine-Free, Low Cost and Easily Processable Materials for Hydrophobic Coatings on Flexible Plastic Substrates

1
Department of Chemical Sciences, University of Naples Federico II, via Cintia 4, I-80126 Napoli, Italy
2
Laboratory for Nanomaterials and Devices (SSPT-PROMAS-NANO), ENEA—C. R. Portici, Piazzale Enrico Fermi 1, I-80055 Portici (Napoli), Italy
3
IMAST S.c.a.r.l., Piazza Bovio, 22, I-80133 Napoli, Italy
*
Author to whom correspondence should be addressed.
Materials 2019, 12(14), 2234; https://doi.org/10.3390/ma12142234
Received: 21 June 2019 / Revised: 5 July 2019 / Accepted: 9 July 2019 / Published: 11 July 2019
(This article belongs to the Special Issue Thin Film Fabrication and Surface Techniques)
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Abstract

Zinc oxide nanoparticles (ZnONPs) and stearic acid are herein used for the preparation of hydrophobic coatings with good moisture barrier property on flexible plastic substrates. Fast, high throughput, mild and easy-to-run processing techniques, like airbrushing and gravure printing, are applied for thin films deposition of these materials. The results of this study indicated that the best hydrophobic coating in terms of water contact angle (115°) is obtained through a two-steps printing deposition of a ZnONPs layer followed by a stearic acid layer. All the deposition procedures proved to be effective in terms of water vapor barrier properties, reaching values of 0.89 g/m2/day, with a 45% reduction with respect to the bare substrate. These preliminary data are very encouraging in the perspective of a low cost and green approach for the realization of functional coatings for packaging applications. View Full-Text
Keywords: zinc oxide nanoparticles; hydrophobic coating; water vapor transmission rate; green processing zinc oxide nanoparticles; hydrophobic coating; water vapor transmission rate; green processing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Prontera, C.T.; Sico, G.; Montanino, M.; De Girolamo Del Mauro, A.; Tassini, P.; Maglione, M.G.; Minarini, C.; Manini, P. Sustainable, Fluorine-Free, Low Cost and Easily Processable Materials for Hydrophobic Coatings on Flexible Plastic Substrates. Materials 2019, 12, 2234.

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