Weather-proof coatings of wood and WPC based on low-grade solvent transparent acrylate-silica-ZnOnano-composites
: 18 - 21
Nano-composite UV-coatings with adjustable properties for use on wood substrates in outdoor conditions were developed. The coatings were characterized in terms of elongation at brake, residual photo-initiator content, and double bond conversion as well as of universal hardness, transparency, hydrophobicity, and yellowing. Their suitability for use in outdoor conditions was additionally assured by optimizing the elasticity of the coating and decreasing its water permeability. Coated samples were artificially weathered and studied with regard to their optical and mechanical properties, as well as to changes in brightness, transparency, hydrophobicity and water permeability. Nanoscale ZnO was shown to be an efficient light absorber, particularly when used in combination with a lignin stabilizing wood impregnation. The prepared wood coatings showed an increased weather fastness and improved optical properties. These coatings can also be used for weather protection of WPC façade panels.