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Emergence of Wrinkles during the Curing of Coatings

1
Fukuoka Institute of Technology, Fukuoka 811-0295, Japan
2
Department of Computer Science, Ochanomizu University, Tokyo 112-8610, Japan
*
Author to whom correspondence should be addressed.
Received: 15 February 2018 / Revised: 4 April 2018 / Accepted: 29 April 2018 / Published: 3 May 2018
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Abstract

Wrinkles often emerge on a paint layer when a second coat of paint is applied on an already-coated substrate. Wrinkle formation occurs when the first layer absorbs organic solvent from the second layer. We set up experiments to mimic the double-coating process, focusing on the interaction between a paint layer and an organic solvent. In the experiments, we investigated the characteristic wavelengths of the wrinkles and the time of wrinkle emergence. We employed a simple model to explain the wrinkle emergence and performed numerical simulations. The linear stability analysis of the model provides a relation between the wavelengths and the characteristic timescale that agrees reasonably well with our experimental data as well as numerical results. Our results indicate that compression of the layer due to swelling and delamination are both important factors in the formation of wrinkles. View Full-Text
Keywords: paint coating; wrinkle; swelling; buckling paint coating; wrinkle; swelling; buckling
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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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Shimokawa, M.; Yoshida, H.; Komatsu, T.; Omachi, R.; Kudo, K. Emergence of Wrinkles during the Curing of Coatings. Gels 2018, 4, 41.

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