Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Powder coating films with latent adhesive function for metal-plastic hybrids

Pulverlacke mit latent vorhandener haftvermittelnden Funktion für Metall-Kunststoff-Verbunde
: Gedan-Smolka, Michaela; Kühnert, Ines; Scholz, Peter; Fischer, Matthieu; Berger, J.; Tuschla, Marcel; Landgrebe, Dirk; Lehmann, D.

Institute of Materials -IOM-, Communications Limited, London:
EURADH 2016, ADHESION 2016 : Eleventh European Adhesion Conference and Thirteenth International Trienniall Conference on the Science and Technology of Adhesion and Adhesives; 21 September - 23 September 2016, Glasgow
London: IOM, 2016
European Adhesion Conference (EURADH) <11, 2016, Glasgow>
International Trienniall Conference on the Science and Technology of Adhesion and Adhesives (ADHESION) <13, 2016, Glasgow>
Fraunhofer IWU ()
Metall-Kunststoff-Verbunde; Hybrid-Bauteile; Haftvermittler; uretdione powder coating; precoated aluminium; polyallophanate network; latent heat storage; adhesive layer; metal-plastic hybrids; injection moulding; overmoulding

In the presence of specific catalysts the reaction between uretdione crosslinkers and Ohpolyester resins results in a two-step curing mechanism. A polyallophanate network is formed at crosslinking temperatures up to 150 °C. At temperatures higher than 170° C the polyallophanate network is transferred into polyurethane structures completely. It was already proved earlier that the second reaction can be used as a reactive adhesive layer in a subsequent injection moulding process. The goal of this study was to investigate the influence of the OH number of the resin on powder coating properties, the formability of aluminiumpowder coating systems and resulting adhesive strength after injection moulding of thermoplastic polyurethane to the precoated aluminium substrate. Very flexible powder coating films were developed which are able to post-form by e.g. deep drawing. It was shown that the adhesive strength between the powder coating layer and the following injection moulded thermoplastic is relatively independent on the OH group content.