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Michaela Gedan-Smolka - Polyallophanate Powder Coatings as Latent Reactive Layer for Chemical Bonded Metal-plastic Hybrids


Michaela Gedan-Smolka - Polyallophanate Powder Coatings as Latent Reactive Layer for Chemical Bonded Metal-plastic Hybrids


Michaela Gedan-Smolka
Leibniz-Institute für Polymerforschung Dresden
Co-authors: Ines Kühnert, Peter Scholz, Dieter Lehmann


PhD 2003 at the Technical university of Dresden, Polymer chemist
Research group leader in the Department of Reactive Processing with the topic “Thermo-controlled reactions in Polymer Melts”. More than 15 years experience in fundamental and applied research of coatings.

Subjects of recent work:
- Fundamental and applied research of thermo-controllable reactions in polymer melts, catalysis.
- Basic and applied research for the development of novel functional organic coatings(e.g. post-formable,
  anti-friction, hydrophobic, scratch resistant/  powder,  solvent-, water-based).
- Investigations in the field of functional additives (e.g. antistatic additives for wood materials, plastics).


Caused by the demands of lowering the fuel consumption the automotive industry enhances their efforts of weight-reduction. For that reason a multi-material design, the use of plastics and fibre reinforced structural parts become more and more important. The steadily increasing use of these materials in combination with metal parts made it necessary to change the joining technologies from mechanical joining or welding to adhesive bonding. Therefore usually a further technology step is needed whereas the glue is applied, followed by the assembling. The aim of our research work was to develop powder coating materials with an additional latent adhesive function which enable highly efficient production lines for metal-plastic hybrids. An initial proof of concept has been confirmed in the past by using a powder coating formulation based on uretdione crosslinkers and polyester resins, which was developed with the scope of low temperature curing for post-forming operations. This study is focused on the development of novel powder formulations to get a further improvement of the adhesive strength for metal-plastic hybrids. The goal was to investigate the influence of the OH-group number of the resin on powder coating properties, the formability of powder coating systems after application to aluminum sheet material and resulting adhesive strength after injection moulding of thermoplastic polyurethane to the precoated aluminum substrate. Very flexible powder coating films were developed with enhanced powder Tg and film Tg values 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 molded thermoplastic is relatively independent on the OH group content.

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