Development of a durable, low fungicide content coating system for wood facades
In recent years, wooden facades treated with water-borne coatings show an increasing tendency to discoloration or damage by mould and blue-stain fungi after a short period of time. Within the scope of a KTI research project in collaboration with the UAS for architecture, building structure and wood (HSB Biel), and industrial partners of the woodworking, biocide and coating industries, a range of water-borne coating systems are being assessed. It is envisaged that the appraisal of a range of biological, physical and chemical factors may allow a better understanding why some coating systems are colonized earlier than others. At the Empa we examine whether the coating system itself can be utilized by fungi as a nutrient source or if the resistance of the active substance is influenced by abiotic conditions such as heat, frost, leaching and ultraviolet light. Furthermore spore adhesion to the surface of coatings and subsequent spore germination will be investigated. A new approach is based on the biotechnological preconditioning of the wood surface by appropriate microorganisms prior to application of the primer to achieve a better absorption and penetration depth of preservatives.
Contact: Francis Schwarze