Weathering of selected pigments in an industrial city atmosphere

摘要

Stability of phthalocyanine,1-nitroso-2-naphthol Fe,Co,and Mn complexes,diketopyrrolopyrrole,and tetrachloroisoin-dolinone used alone and as pigments (0.5 or 1%) in a standard vinyl-acrylic paint,was examd.on a 12-week (June-Sept.2003) outdoor and indoor exposures in terms of color change detd.by an X-Rite spectrophotometer and pigment's structure change detd.by UV-VIS and IR spectroscopy.Coatings applied to glass conditioned 14 days at 23 +- 2 deg C,RH 50 +- 2%,were exposed to the atm.at Oswiecim,PL Nondi-spersed pigments were lit for 168 hrs.with a 280-nm Xe lamp at 55 deg C and then IR analyzed.In IR terms,the Fe complex was most resistant,and the other pigments were fully resistant,to accelerated aging.The Co and Mn complexes were least resistant to the 12-week outdoor exposure.Most fading were the diketo and the tetrachloro pigments,but the Xe lamp irradiation produced no major structure changes.The color changes in the tetrachloro pigments produced in the 12-week test were invisible to the human eye.