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Development of uretdione powder coatings for the pre-coating of deep-drawable aluminum sheets

: Gedan-Smolka, M.; Demmler, M.; Edelmann, M.; Töpfer, A.

European Coatings Conference: Polyurethanes for High Performance Coatings IV : Berlin, Germany, March 23rd - 24th 2006
Hannover: Vincentz, 2006
European Coatings Conference "Polyurethanes for High Performance Coatings" <4, 2006, Berlin>
Fraunhofer IWU ()
pre-coating; powder coating; uretdione; deep drawing; aluminum sheet

Urethane powder coatings based upon uretdione crosslinkers are known for their outstanding properties like weathering resistance, superior flow properties and surface finish quality. However, the high curing temperatures prevented the use of those powder coatings for the pre-coating of aluminum-sheets and other thermo-sensitive substrates until recently.
During the last few years highly flexible and glossy powder coatings were developed which allow the coating of aluminum sheets at temperatures £ 150°C. In that way crystallization and solidification processes of the aluminum-substrate itself, resulting in a decrease of the formability, can be prevented. The pre-coated aluminum sheets are extremely shapeable by deep drawing at room temperature to 3-D-parts without showing any micro-cracks and negligible or no gloss reduction in forming zones.