Verwertung von Overspray aus der Verarbeitung von Wasserbasislack Abschlussbericht

For the first time overspray of water basecoat within the automobile series coating could be recycled successfully at high level. Up to now this seemed to be impossible, as the overspray contains coatings of different colours and of different manufacturers. All known methods to recycle coatings have been examined in a technical pilot plant. No success was achieved by 1) coagulation of the overspray and following extraction of the binder, nor by 2) stabilisation of the overspray in the spray booth water and following electrophoresis. Very good results, however, were achieved by stabilisation with ultrafiltration or vaporization following. It was possible to transform the concentrated coating to a modified water filler, which can be used for the coating of new cars. Advantages: 1) Recycling process is integrated in production. 2) Conservation of the high technological potential of the overspray. 3) Cost reduction by saving raw material for the water filler production. 4) The recycled product is recyclable again. The results of the project have led to a concept for an industrial pilot plant to be built at the automobile car factory of Daimler-Benz AG in Bremen, Germany. (orig.)SIGLEAvailable from TIB Hannover: F97B2123+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman