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Journal of Coatings Technology and Research

25-04-2024

Crosslinking characteristics of aziridine crosslinkers in polyurethane-based clearcoats for automotive applications

Authors: Daegeun Oh, Junyoung Park, Young Kyu Song, Seung Man Noh, Hyun Wook Jung

Published in: Journal of Coatings Technology and Research

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Abstract

Crosslinking systems play a vital role in the coating industry by significantly improving the wear resistance, chemical resistance, and toughness of the coatings. In particular, polyfunctional aziridines, known for their distinctive nitrogen-containing three-membered ring structures, serve as versatile crosslinkers in automotive coatings and adhesives. These crosslinkers can effectively enhance both the physical and chemical properties of polyurethane coatings. This study focuses on investigating the impact of two different trifunctional aziridines on the thermal curing characteristics of 2K clearcoats containing free-isocyanate crosslinker and polyacrylic resin. The analysis confirmed the ring-opening reaction of the aziridine crosslinker with the carboxyl groups in the resin at room temperature, as evidenced by changes in the –NH stretching frequency in the Fourier transform infrared spectra. To assess the real-time curing performance of aziridines during thermal curing at 80 °C, rheological storage modulus and curing behavior of the formulated 2K clearcoats were measured using a rotational rheometer and a rigid-body pendulum tester. Additionally, nano-indentation and nano-scratch tests were conducted to quantitatively evaluate the surface hardness and scratch resistance of the cured clearcoat films. By examining the relationship between the curing dynamics and the final mechanical properties, this study offers insights into optimizing the amount of aziridines required to enhance the properties of clearcoat films.

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Metadata
Title
Crosslinking characteristics of aziridine crosslinkers in polyurethane-based clearcoats for automotive applications
Authors
Daegeun Oh
Junyoung Park
Young Kyu Song
Seung Man Noh
Hyun Wook Jung
Publication date
25-04-2024
Publisher
Springer US
Published in
Journal of Coatings Technology and Research
Print ISSN: 1547-0091
Electronic ISSN: 1935-3804
DOI
https://doi.org/10.1007/s11998-024-00932-5

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