THE EFFECT OF UV ABSORBERS ON THE LIGHTFASTNESS OF DYED VENEERS

To address the problems of fading, surface yellowing and breakage of dyed veneers under prolonged sunlight, this paper uses ash veneers as raw material and new coccine as dye to investigate the effects of bleaching pretreatment, different concentrations (0.5%, 1% and 1.5%) and types of UV absorbers (benzotriazole, TiO2, nano-TiO2) on the color difference value △E of the dyed veneers in the process of aging by natural light and aging by artificial light. The effect of UV absorbers on the color difference △E of dyed veneers during natural light aging and artificial light aging was clarified. The experimental results show that under the natural light condition, the bleached dyed veneer with 0.5% benzotriazole has the lowest △E value, which is about 1.3, and under the artificial UV irradiation condition, the bleached dyed veneer with 1% TiO2 has the smallest △E value, which is about 0.4.