Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Why the binder is critical to minimising colour shifts on wall finishes. An end to fast fading facades
In recent years more and more exterior paints have been sold tinted, not only in light pastel tones but also in deeper shades. The inorganic pigments are generally based on metal oxides. In general, these oxides provide less colour intensity than organic pigments, but have better resistance to outdoor weathering effects Paints with inorganic colour pigments are almost as durable as white ones. These paints usually have high hiding power, but they lack brilliance. For brighter colours, organic pigments have to be used in the paint formulation. These organic pigments are known to be less stable during outdoor weathering; The increasing use of deep coloured finishes on facades has revealed problems of relatively rapid colour fading. lt is shown that the reason for this is not purely fading of the organic colour pigment by UV exposure, but also erosion of the binder, leading to more titanium dioxide becoming exposed an the surface. These paints ade normally formulated above the CPVC. The use of lower PVC levels might improve this situation, but could impair the required waten vapour permeability. A new acrylic binder was compared with a standard one in high PVC wall paint formulations tinted with organic pigments. Accelerated weathering tests with a "Xenotest" and natural weathering showed in all cases that the new binder led to significantly less colour fading, both visually and in terms of the CIELab ΔE value.
Why the binder is critical to minimising colour shifts on wall finishes. An end to fast fading facades
In recent years more and more exterior paints have been sold tinted, not only in light pastel tones but also in deeper shades. The inorganic pigments are generally based on metal oxides. In general, these oxides provide less colour intensity than organic pigments, but have better resistance to outdoor weathering effects Paints with inorganic colour pigments are almost as durable as white ones. These paints usually have high hiding power, but they lack brilliance. For brighter colours, organic pigments have to be used in the paint formulation. These organic pigments are known to be less stable during outdoor weathering; The increasing use of deep coloured finishes on facades has revealed problems of relatively rapid colour fading. lt is shown that the reason for this is not purely fading of the organic colour pigment by UV exposure, but also erosion of the binder, leading to more titanium dioxide becoming exposed an the surface. These paints ade normally formulated above the CPVC. The use of lower PVC levels might improve this situation, but could impair the required waten vapour permeability. A new acrylic binder was compared with a standard one in high PVC wall paint formulations tinted with organic pigments. Accelerated weathering tests with a "Xenotest" and natural weathering showed in all cases that the new binder led to significantly less colour fading, both visually and in terms of the CIELab ΔE value.
Why the binder is critical to minimising colour shifts on wall finishes. An end to fast fading facades
Warum der Binder kritisch beim Minimieren von Farbveränderungen von Fassadenfarben ist. Ein Ende des schnellen Ausbleichens von Fassaden
Cabrera, Ivan (Autor:in) / Mollat-du-jordin, Xavier (Autor:in) / Tissier, Nicolas (Autor:in) / Jahns, Ekkehard (Autor:in)
European Coatings Journal ; 140-143
2013
4 Seiten, 7 Bilder, 1 Tabelle
Aufsatz (Zeitschrift)
Englisch
Minimising colour variation in formed finishes
British Library Online Contents | 2003
The Deterioration of Building Facades and Minimising the Costs of Maintenance
| British Library Conference Proceedings | 1998
| British Library Online Contents | 2015