Improvement of the dimensional stability and other material properties of extruded wood-plastic composites (WPC) for outdoor use by chemical modification of the wood filler

Through chemically modifying the wood filler (similar to the modification of solid wood), various properties of wood-polymer composites (WPC) are to be significantly improved. These properties include in particular the dimensional stability, interphase adhesion between wood and plastic, mechanical-physical properties, as well as resistance to wood-destroying fungi, soil fungi, mould, and blue fungus. In combination with an FNR project for the development of novel wood-based materials (FKZ 22009206), chips (fibres) are treated by various modification methods and characterized by various analytical methods. From the treated chips, WPC formulations are then prepared by thermal moulding processes with various properties then examined. The developed technology is finally transferred to technical scale and integrated into existing industrial processes. The recycling takes place together with the industrial partner companys Werzalit AG and Kosche in the context of the industrial implementation. Chemical manufacturers are also involved in this process.