Assessment of the factors affecting the weathering properties of Pigment Yellow 74 in decorative paint

Abstract

Color or shade fading is one of the major issues observed in decorative paints. Here we have carried out a systematic artificial weathering study using QUV and ATLAS weathering test chambers for Pigment Yellow 74 (PY 74). Pigment dispersion of PY 74 received from three different manufacturers are prepared. Various factors, such as the processing parameter, for example, grinding temperature (with and without cooling water circulation during the processing of pigment dispersion), with respect to paints the factors such as primers and clear base paints of different batches, and as for the ATLAS and QUV weatherability test concerned, test panels of different lots, and multiple QUV chambers are evaluated. The color difference was recorded at regular time intervals for the panels exposed to ATLAS and QUV test of 1000 hours using color spectrophotometer. A significant color difference was recorded for the panels coated with paints based on pigment dispersion prepared using PY 74 from different manufacturers, and the difference in grinding temperature. These results show the importance of process parameters such as grinding temperature on weathering properties, and systematic testing approaches for QUV/ATLAS for the pigments from different manufacturers.