How to improve the color fastness of textiles? The low staining of textiles on nylon and acetate fiber linings is a problem that has always existed in the dyeing and finishing industry. The staining of cotton, wool, polyester, nylon and their blended fabrics, and spandex-containing elastic fabrics is usually at level 3. And about level 3. Although different fiber materials use different dyes and printing processes, the problems that arise are quite similar. This is mainly related to the floating color of the cloth and the transfer of some colored fiber particles, so it is also related to the type of dye used, the dyeing process and the post-treatment process.
Taking reactive dyes as an example, in theory, because dyes and fibers form covalent bonds, water washing cannot easily cause dye desorption, fading, and bleeding. Therefore, the fastness of soaping of reactive dyeing products depends on the quality of soaping. Number of unfixed dyes (hydrolyzed dyes and small amounts of unreacted dyes). If the hydrolyzed dye is not completely removed by soaping, subsequent washing will cause continuous discoloration. The soaping fastness is also related to the bond-forming stability of the bonding dye, and the broken dye will also be washed away by water.
The fixing rate of reactive dyes is high, or the hydrolysis rate is slow, the amount of hydrolyzed dyes is small, and the amount of dyes to be removed is also small. Unfixed dyes and hydrolyzed dyes have low directness, good water solubility, not easy to stain, and easy to wash off. The high dye concentration and the large amount of residual dye make it difficult to wash off. To solve this problem, the key is to choose high-quality soaping agents.