Effective measures to improve colour fastness to wet friction（3）

Based on the characteristics of the dyed fabric, finishing the fabric, such as enzymatic polishing treatment, increases the finish of the fabric, decreases the friction, and thus improves the color fastness to wet friction.  

The floating color on the fiber is very unfavorable to the color fastness to wet rubbing. It is advisable to soaps the fabric dyed with deep reactive dyes twice, but too many soaps will destroy the dyed dye, resulting in bond breakage, resulting in reduced effect. It has been tested that the wet rubbing fastness of dyed fabrics can reach grade 3 by washing them with anti-stain detergent (dosage 2-3g/L, treated at 95℃ for 10min). In the actual large-scale production, often occur many conditions, such as steam pressure fluctuation, so that the temperature is not high in the specified time; Stop vehicle operation error or sudden equipment failure, and make the scheduled program deviation, color difference after the addition of dye chemicals, and so on, resulting in color fastness difference (including cylinder difference). For some mechanical equipment and dye varieties, alkali and other chemical agents, in mass production to make the cleaning after dyeing is not very practical, so it should be reasonable choice.  

Because the floating color after reactive dye dyeing is difficult to remove clean, therefore, after the soap is cooked, appropriate stripping agent can be used to remove the floating color clean, so that the fabric dye after removing the floating color and fiber form a complete body, so as to improve its wet rubbing color fastness.  

In view of the covalent bond formed by reactive dyes and fibers may become unstable or even broken under acid or alkali conditions, we can form a soft, strong and water-resistant film on its surface, and improve wet rubbing fastness with its water repellency and soft smoothness. Sol Gel method is an important method for preparing inorganic films. By sol-gel technology, thin films with different components are formed on the fabric, which can improve the wear resistance, water and oil resistance of the fabric and improve the wet rubbing fastness to a certain extent. However, it has a strong influence on its feel. It has been reported that YKA2955 and YKA2977 developed by Yonosheshi Oil Company in Japan can form a soft and strong film on the fabric surface by impregnating with reactive dyes in a mixture of 4∶1, thus improving the wet rubbing fastness.