PROCESS OF POWDER COATING ALUMINIUM SUBSTRATES

• Main Authors: MARELLI, ERNESTO, RODRIGUEZ-SANTAMARTA, CARLOS, REKOWSKI, VOLKER
• Format: Patent
• Language: English; French
• Published: 05.03.2009
• Subjects: APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; PERFORMING OPERATIONS; PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; SPRAYING OR ATOMISING IN GENERAL; TRANSPORTING

The present invention provides a process of powder coating aluminium substrate surfaces comprising the steps a) pre-treating the aluminium substrate surface by a color-less chemical treatment process, b) applying a clear powder coating composition based on at least one (meth)acrylic resin and at least one resin selected from the group consisting of polyester resin and polyurethane resin providing a low gloss of the cured coating in the range of 1 to 20 gloss units at 60°, and curing the coating composition. The process according to the invention makes it possible to provide a desired special effect of the coated surface which meets the effect resulted using the anodizing process, called as 'anodizing effect'. A one-layer coating of the substrate is possible providing additionally a high appearance and smoothness of the cured coating, a strong adhesion to non-primered aluminium substrate surfaces as well as an excellent hardness, corrosion- resistance, weather resistance and light fastness of the cured coating.