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

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 ma...

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Bibliographic Details
Published in:JCT research 2021-03, Vol.18 (2), p.469-488
Main Authors: Asemani, H. R., Mannari, V.
Format: Article
Language:English
Subjects:
Acrylates
Ambient temperature
Chemistry and Materials Science
Coatings
Corrosion and Coatings
Corrosion resistance
Curing
Feasibility studies
Fourier transforms
Industrial Chemistry/Chemical Engineering
Isocyanates
Materials Science
Mechanical properties
Michael reaction
NMR spectroscopy
Oligomers
Polymer Sciences
Polyurethane
Polyurethane resins
Surfaces and Interfaces
Thermomechanical properties
Thin Films
Tribology
Ultraviolet radiation
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Summary: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. Graphic abstract
ISSN:1547-0091
1935-3804
2168-8028
DOI:10.1007/s11998-020-00425-1