EMULSIFIERS WITH HIGH CHEMICAL-RESISTANCE - A KEY TO HIGH-PERFORMANCEWATERBORNE COATINGS

A powerful way to coatings with low volatile content are waterborne sy stems. They are an important alternative to high solid- and powder coa tings. It is essential, that waterborne coatings should not have a low er property level compared with conventional systems. A novel type of emulsifier allows the preparation of non-ionic stabilized aqueous emul sions. The main advantage of this new type of emulsifier consists in i mproving the chemical resistance of the resulting crosslinked films, e specially against acids. There upon they show no discoloring even at h igh staving temperatures and a very good emulsifying behavior. The bas e type can be easily functionalized with a multitude of chemical funct ionalities like -OH, -COOH or vinyl groups. That means the emulsifier can be incorporated in the film during the crosslinking reaction. A mi gration to the coating surface can be avoided under these conditions. The different synthesis routes will be described in detail. A comparis on of three non-ionic stabilized waterborne automotive coating systems with different crosslinking reactions (polyurethane, transetherifying and nucleophilic addition) with the corresponding ionic stabilized sy stems shows the extraordinary quality of the new tones of emulsifiers. (C) 1998 Published by Elsevier Science S.A. All rights reserved.