Correlation between the scratch resistance of UV-cured PUA-based coatings and the structure and functionality of reactive diluents

• Published in: Progress in organic coatings Vol. 124; pp. 193 - 199
• Main Authors: Magnoni, Federico, Rannée, Agnès, Marasinghe, Liza, El-Fouhaili, Bandar, Allonas, Xavier, Croutxé-Barghorn, Céline
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-11-2018; Elsevier BV
• Subjects: Abrasion resistance; Abrasion resistant coatings; Adhesion; Adhesive strength; Aeronautics; Automobile industry; Automotive engineering; Automotive parts; Controllability; Curing; Food packaging; Food packaging industry; Formulations; Migration; Polyurethane; Polyurethane resins; Protective coatings; PUA based coatings; Raw materials; Reactive diluent; Scratch resistance; Substrates; Ultraviolet radiation; UV-cured coatings; PUA based coatings; Reactive diluent; UV-cured coatings; Abrasion resistance; Scratch resistance
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2018.06.015

Influence of the reactive monomer amount, its functionality and chemical structure on the scratch resistance of UV-cured PUA coatings.
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UV-curing technology is a powerful technique for a wide range of applications. The advantages of UV-curing, including speed and process controllability, and the wide range of raw materials and solvent-free formulations are well-known. However, some specific end-product issues such as the migration of components in food packaging, the odor in thiol-based formulations, the scratch or abrasion resistance in the automotive and aeronautic industry still need to be addressed. In this work, the predictable tendency of the scratch resistance of a polyurethane acrylate (PUA)-based coating is proposed with respect to the structure and functionality of the reactive diluent used. The correlation between the scratch resistance and abrasion resistance of or adhesion to the substrate was also demonstrated.