| Résumé : |
Waterborne 2K polyurethane coatings based on the new generation of cosolvent-free, OH-functional polyurethane dispersions and internally activated polyacrylate dispersions are excellently suited for the use in transportation (eg trains, trucks, buses and ACE market) clearcoats and topcoats as well as for metal, plastic and wood substrates. Depending on the coating formulation, they prove to be hard, yet still flexible, even in cold weather.
Additional values to mention are the corresponding coatings are high-gloss, weather resistant, highly chemical resistant and, depending on the dispersion used, characterised by a pronounced self-healing effect after scratching or are very fast drying, meaning the oven temperature for drying coated objects can be reduced to cut energy costs and CO2 emissions. These new PU and PAC dispersions are already used in the field of general industrial, wood and furniture coating. The dispersions presented here make it possible, using waterborne products, to fulfill or even exceed the requirements imposed on coatings in market segments previously dominated by conventional coating systems and they are very eco-friendly thanks to their low VOC content. A significant expansion is expected in the use of waterborne polyurethane coatings in the medium term. These new building blocks, therefore, will add a new chapter to the overall success story of aliphatic 2K polyurethane coatings. |
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Accueil
Modern 2K PU waterborne in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 203, N° 4580 (01/2013)
