DETERMINATION AND DEVELOPMENT OF LIGHT FASTNESS OF LEATHER TANNED WITH DIFFERENT TANNING MATERIALS
Project no. 1363 · Status: Kapanmış · 2017
Summary
Light fastness of a skin is the feature of not fading or darkening in color due to the light which receives over time. It can be faded, darkened or bleached in the surface color of the skin that stays under the light for a long time. Changing the color under the light causes the useful life of the skin to decrease. The light fastness of the skin is associated with the tanning agents dyes, retanning agents and other auxiliaries. Tanning agents have varied efficiency on the UV durability and stabilization of collagen. They have different bond strengths and binding mechanisms with leather. In this project, light fastness properties of the leathers tanned with most commonly used white tanning agents were evaluated by using ATLAS XENOTEST ALPHA+ test instrument according to ISO 105-B02 standard test method and compared with chromium tanning agent. Blue wool test references were evaluated to the scale, then evaluation of the color changing on the tanned and dyed leathers against UV application of an artificial light source representative of natural daylight was carried out. Moreover, colorimetric measurements of the treated samples and color changes after UV application were also spectrophotometrically evaluated by Konica Minolta CM-3600d test device. The results showed that chromium provided the best light fastness to leather compared to other white tannages. Zirconium and phosphonium tanned leathers had the same values and better than aluminium and vegetable tanned leathers. These differences were also observed and proved by spectrophotometrically measurements. Key words: Leather, light fastness, fading, tanning materials.