Paint does not only provide protection, but also a decorative finish. Most coatings, however, are exposed to the normal weathering process, which includes dirt pick-up. Over time the appearance deteriorates. Accordingly, there is a high interest in the industry for coatings with self-cleaning or easy-cleaning properties. In nature, there are perfect examples for self-cleaning effects, where rain water easily removes dirt from surfaces. Scientific studies have identified the three major properties for this self-cleaning effect, namely: Low surface tension, a permanent hydrophobic surface and a surface micro structure.
One can reproduce this effect in a coating, but a micro structure will result in a matt coating. However, additives can provide a long term self-cleaning effect without the necessity of a structured surface, so that high gloss systems with easy-to-clean surfaces can be achieved. This concept is available for solvent-borne as well as for water-borne systems.
Edited by: Andy
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