How to improve textile fastness

How to improve textile fastness? The dyeing and finishing problem is that the dyeing and finishing of textiles is low to nylon and acetate fiber lining. The dyeing and finishing problems of cotton, wool, polyester, nylon and their blended fabrics, as well as elastic fabrics containing spandex are usually at grade 3 or below. Although the dyes and printing and dyeing processes used vary from fiber material to fiber material, the problems that arise are quite similar. This is mainly related to the transfer of floating color and some colored fiber particles on the cloth surface, so it is related to the dye varieties, dyeing process and post-treatment process used.

Taking reactive dyes as an example, theoretically speaking, due to the formation of covalent bond between dyes and fibers, water washing can not easily cause dye desorption, fading and color infiltration. Therefore, the color fastness of reactive dye dyeing products to soap is determined by the amount of unfixed dyes (hydrolyzed dyes and a small amount of unreacted dyes). If the hydrolytic dye soap is not removed, the subsequent washing will continue to fade. The fastness of soap washing is also related to the bond stability of the bond dye, and the broken bond dye will also be washed off.

Reactive dye fixation rate is high, or the hydrolysis rate is slow, the amount of hydrolyzed dye is less, and the amount of dye to be removed by washing is also less. Unfixed dyes and hydrolyzed dyes have low directness, good water solubility, not easy to stain and easy to wash away. But the dye concentration is high, the residual dye amount is much, it is not easy to wash clean. To solve this problem, the key is to choose high-quality soap.