Self-Healing UV Curable Acrylate Coatings for Wood Finishing System, Part 1: Impact of the Formulation on Self-Healing Efficiency

Coatings

卷:10

Jean-François Morin¹  JolantaE. Klemberg-Sapieha²  Thomas Schmitt²  Chloé Paquet³  Véronic Landry³ 

[1] Département de Chimie et Centre de Recherche sur les Matériaux Avancés (CERMA), Université Laval, Québec, QC G1V 0A6, Canada;

[2] Département de Génie Physique, Polytechnique Montréal, Montréal, QC H3T 1J4, Canada;

[3] Département des Sciences du Bois et de la Forêt, Chaire de Recherche Industrielle CRSNG–Canlak en Finition des Produits du Bois d’Intérieur (CRIF), Université Laval, Québec, QC G1V 0A6, Canada;

关键词: acrylate;    UV curable;    self-healing;    hydrogen bonds;    cross-linking;   

DOI  :  10.3390/coatings10080770

来源: DOAJ

【 摘 要 】

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 T_g 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.

【 授权许可】

Unknown