Scratch and mar performance of automotive topcoats has become an increasing customer concern in recent years. Therefore, my paper focuses firstly, on the influence of weathering on the scratch and mar resistance and secondly, on changes in the visibility of the scratches under the influence of the weather. Examining a series of modern automotive coatings with different PU clearcoats natural and artificial weathering were done before and after the scratch test. Scratching was carried out using two different scratch techniques. In comparison to other essential coating properties the scratch and mar resistance was most detrimentally affected by the weathering. Conclusions: The essential property of modern clearcoats which shows the most detrimental effect to weathering - is the scratch and mar resistance. The potential to reflow can get lost completely in the course of the pre-weathering. The optical properties changes only negligibly during long weathering period. The terms 'weatherabilitiy' and 'UV resistance' ought to be defined newly in favour of the more substantial effect of weathering on scratch and mar resistance. Gloss loss or haze increase must not be more the major criterion for UV resistance.
The influence of natural and artificial weathering on the scratch and mar resistance of automotive coatings
Der Einfluß künstlicher und natürlicher Bewitterung auf die Kratz- und Beschädigungsfestigkeit von Kraftfahrzeuglacken
2002
14 Seiten, 18 Bilder, 2 Tabellen, 13 Quellen
Conference paper
English
Changing of scratch and mar resistance by natural and artificial weathering
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