Abstract
A solventborne linseed oil alkyd was formulated with two different free radical photo-initiators and a photosensitizer to enhance autoxidative crosslinking. Irgacure 784 and Irgacure 819 significantly decreased the dry-to-touch and through-cure times of alkyd systems at ambient conditions using indoor lighting. Real-time Fourier transform infrared spectroscopy, and solid state 13C NMR were used to monitor the curing process and two mechanisms are proposed to explain the increase in crosslinking. Films were evaluated for tensile, viscoelastic, and thermal properties, indicating an increase in crosslink density. Coating performance was evaluated, significantly increasing film hardness, while maintaining appearance. However, the adhesion and chemical resistance decreased. Visible-light curable alkyds offer excellent appearance and fast curing rates, without the use of cobalt driers.
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