Pigments are blended into exterior paints and renders in order to add rich, vivid color to the walls of homes and other buildings. While organic pigments are known for their wide variety of shades, they are not particularly stable, especially when exposed to UV radiation. As a result, they fade and become increasingly pale over time due to the sun and weather. Inorganic pigments, by contrast, are better able to resist the elements, but do not offer the same variety of shades and hues.
The new PRIMIS® AF 1000 binder significantly increases the stability of organic pigments in paint formulations. “Mineralization is a more efficient way of protecting organic pigments from UV radiation,” Kotschi notes. As the WACKER chemist then goes on to explain, “They lose their brilliance and intensity much more slowly as a consequence, allowing exterior paints to retain their original shade longer.” This enhanced color consistency and paint longevity has also been verified in the lab using what is known as a QUV tester to simulate accelerated weathering. In these experiments, lab employees exposed the test materials to alternating cycles of UV light and moisture at high and low temperatures, thereby mimicking the effects of sunlight, dew, rain and spray. Scientists can simulate within a few days or weeks the damage caused by months of exposure to climate and weather.