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Published in: Journal of Coatings Technology and Research 2/2021

08-01-2021

Ambient temperature and UV-cured hybrid coatings from acetoacetylated non-isocyanate polyurethanes

Authors: H. R. Asemani, V. Mannari

Published in: Journal of Coatings Technology and Research | Issue 2/2021

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Abstract

Preparation of ambient and UV curing non-isocyanate polyurethane (NIPU) coatings has been reported using a series of acetoacetylated non-isocyanate polyurethane (AA-NI-PUPO) oligomers. Synthesized oligomers were characterized using various techniques such as Fourier transform infrared and nuclear magnetic resonance spectroscopy. AA-NI-PUPOs showed significantly lower viscosity compared to their non-acetoacetylated counterparts. Ambient temperature-cured systems were formulated by mixing AA-NI-PUPOs and different primary amine compounds in stoichiometric proportions. Michael addition reaction of acrylates and AA-NI-PUPOs was initiated by UV curing using a photobase generator as the catalyst. NIPU coatings were studied for various thermo-mechanical properties and corrosion resistance. The selected UV-cured and ambient-cured samples showed instant and 1-h tack-free time, respectively. Results revealed that with proper selection of acetoacetylated resin and crosslinker type, coatings with properties comparable to conventional PU coatings could be formulated. Moreover, UV-curable coatings with up to 90 wt% solid could be formulated using conventional monomeric acrylates as a reactive diluent. The study demonstrates the feasibility of formulating solvent-free rapid ambient curing non-isocyanate polyurethane coatings.

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Literature
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Metadata
Title
Ambient temperature and UV-cured hybrid coatings from acetoacetylated non-isocyanate polyurethanes
Authors
H. R. Asemani
V. Mannari
Publication date
08-01-2021
Publisher
Springer US
Published in
Journal of Coatings Technology and Research / Issue 2/2021
Print ISSN: 1547-0091
Electronic ISSN: 1935-3804
DOI
https://doi.org/10.1007/s11998-020-00425-1

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