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Self-healing UV curable acrylate coatings for wood finishing system, part 1: impact of the formulation on self-healing efficiency

Chloé Paquet, Thomas Schmitt, Jolanta-Ewa Sapieha, Jean-François Morin and Véronic Landry

Article (2020)

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Abstract

In the wood flooring sector, good surface mechanical properties, such as abrasion and scratch resistance, are prerequisite. Surface wood protection is provided by finishing systems. Despite coating improvement, scratches formation on wood flooring is unavoidable. A new approach to increase service life is to confer the self-healing property to the finishing system. The most common coatings used for prefinished wood flooring are acrylate UV curable 100% solids coatings. They usually have good mechanical properties and high cross-linking density. The objective of this study was to develop and evaluate an intrinsic self-healing formulation, which is applicable to wood flooring. For this purpose, acrylate formulations were developed with monomers and oligomers carrying hydroxyl groups. To meet the requirements of wood application, hardness, and polymerization conversion of coatings were evaluated. König pendulum damping tests provide information on coating hardness and flexibility. Results around 80 oscillations is acceptable for UV curable wood sealer. The chemical composition was studied by FT-IR spectroscopy while dynamical mechanical analysis (DMA) was performed to determine glass transition temperature and cross-linking density. The self-healing behavior was evaluated by gloss and scratch depth measurements. The formulation’s composition impacted the hydrogen binding quantity, the conversion, the Tg and the cross-linking density. The (hydroxyethyl)methacrylate (HEMA) monomer provided self-healing and acrylated allophanate oligomer allowed self-healing and cross-linking. This study demonstrated that it is possible to combine high cross-linking density and self-healing property, using components with low steric hindrance.

Uncontrolled Keywords

acrylate; UV curable; self-healing; hydrogen bonds; cross-linking

Subjects: 2100 Mechanical engineering > 2100 Mechanical engineering
2100 Mechanical engineering > 2101 Solid mechanics
2100 Mechanical engineering > 2106 Stress analysis
Department: Department of Engineering Physics
Funders: CRSNG / NSERC, Canlak Industrial Research Chair in Finishes for Interior wood products (CRIF)
Grant number: PCISA 514917–16
PolyPublie URL: https://publications.polymtl.ca/9376/
Journal Title: Coatings (vol. 10, no. 8)
Publisher: MDPI
DOI: 10.3390/coatings10080770
Official URL: https://doi.org/10.3390/coatings10080770
Date Deposited: 16 Aug 2023 13:38
Last Modified: 05 Apr 2024 17:18
Cite in APA 7: Paquet, C., Schmitt, T., Sapieha, J.-E., Morin, J.-F., & Landry, V. (2020). Self-healing UV curable acrylate coatings for wood finishing system, part 1: impact of the formulation on self-healing efficiency. Coatings, 10(8), 770 (19 pages). https://doi.org/10.3390/coatings10080770

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