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What measures can be taken to improve the wet rub fastness?
1.Selection of grey cloth
Dyeing grey fabrics of the same variety and specifications, due to factors such as the quality of the yarn and the different weaving methods, will also cause differences in wet rubbing fastness of dyed fabrics processed using the same process conditions. Therefore, it is better to choose a gray fabric with excellent yarn quality, uniform yarn count, and smooth cloth surface.
The smoother the surface of the fabric, the higher the wet rubbing fastness, so the scorching should be clean, and the colored fiber particles should be reduced; the pressure and temperature of the scouring and bleaching process should be uniform, so that the fabric has uniform wool effect and whiteness Facilitates the diffusion and penetration of the dye.
3.Dye selection and dyeing process
Choose dyes with higher lifting power and less float. When color matching is required, try to choose the same category and the same manufacturer's dyes, and the compatibility values of the color matching dyes should be similar. In the configuration of the dyeing solution, soft water should be used as much as possible. Water softeners can be added when appropriate, and some penetrants can be added to improve the penetrating performance of the dye. During the dyeing process, the pH value of the cloth surface should be controlled between 4.0-7.5 to prevent the strong alkali from destroying the binding force between the dye and the fiber, so that the wet rubbing fastness of the fabric is reduced. The soaping process should remove floating colors as much as possible, which can increase the number of washings and increase the water flow. At this time, a neutral detergent should be used to prevent the alkaline detergent from causing the hydrolysis of the dye again.
In order to improve the rubbing fastness after dyeing, fixation post-treatment is required after dyeing. There are two types of post-treatment: one is a cationic fixing agent, which uses a relatively large molecular weight quaternary ammonium salt cation to combine with the dye anion to block its water-soluble groups, thereby reducing the water solubility of the dye and improving wet rubbing fastness However, this often causes a decrease in the fastness to sunlight; the other is a wet rubbing fastness improver, most of which are polyethylene emulsions and special amino silicone softeners, which crosslink to form a film on the surface of the fabric, thereby reducing the surface The friction force can improve the fastness of wet friction.
How to improve the color fastness to wet rubbing of dyes is a comprehensive issue, which must be controlled from various aspects such as selection of grey fabrics, pretreatment, selection of dyes, and dyeing processes.