Modificação de superfície de tecido de poliéster para o tingimento com o corante C.I. disperso amarelo 211

Abstract

The modification of the surface of fabrics is a process that gives the textile substrate the characteristics required in its final use or as an optimization of processes. Polyester fiber (PES) is the most consumed fiber in the world. However, polyester has low water absorption, becoming highly hydrophobic, which makes wet processing processes on this material difficult, such as dyeing. Surface modification with ozone in polyester fibers appears as an oxidative treatment capable of improving the hydrophilicity of PES bringing benefits to the process in a way that reduces inputs, such as dye, water and process time reduction, in addition to contributing in the reduction of pollutants in the textile effluent. Within this context, dyeing was performed on polyester fabric treated with ozone and without treatment with CI Yellow Dispersed 211. For this purpose, characterizations were carried out with FTIR­AT, Raman and SEM and it was possible to verify that ozone introduced hydroxyl groups on the fiber surface. Another important point analyzed was that the modification with O3 caused an increase in the amount of dye adsorbed by the fiber, which can help in reducing the dye used during the dyeing process. In addition, it was found that the textile material showed greater friction strength, improvements in capillarity and greater amount of adsorbed dye. With this, it can be proved that the modification of the polyester fabric with ozone contributes to the reduction of dye in the dyeing process and in the residual, effluent, as well as in its characteristics.