بررسي حفاظت پشم دندانه شده با دندانه هاي مختلف و رنگرزي شده با روناس در برابر امواج فرابنفش

An Investigation of Protection of Wool Mordanted with Various Mordants and Dyed with Madder against Ultra-Violet

UV irradiation was known as an important factor for skin cancer and also textile fibers and dyes degradation. UV rays have high energy photons degrading dyes and fibers causing fading and rotting of textiles when they are exposed to sunlight. The sun blocking properties of a textile are enhanced when a dye, pigment, delustrant, or UV absorber is present which absorbs UV radiation and releases heat. They block the transmission of UV and inhibit the dye and fiber exposure. In this study, natural dye of madder with different mordants and two organic acids including: tannic acid and citric acid were selected for dyeing wool. Impacts of tanninc acid and madder on UV transmission were investigated. Also the effects of madder on protecting fabrics against UV were determined by measuring their tensile strength. The results indicate that tannic acid has positive influences on blocking UV and even increasing the tensile strength. The results also reveal that silver nitrate and copper sulphate are the best UV blocking among others. Finally, the wool fabric sample treated with silver nitrate and dyed with madder along with tannic acid exhibits the highest protection against UV.