Influencing factors of color fastness to rubbing

1. The influence of fabric surface morphology. Unfixed dyes are the main cause of poor color fastness to rubbing. Under dry conditions, the surface is rough or nubuck and raised fabrics are as hard as hemp fabrics, denim fabrics and pigment printing fabrics. If dry rubbing is performed, it is easy to grind off the dyes, coatings or other colored substances accumulated on the surface of the fabric, and even cause some of the colored fibers to break and form colored particles, which further reduces the color fastness to dry rubbing.

2. The influence of fabric structure The sample surface of light and thin fabrics (usually synthetic fibers or silk fabrics) is relatively loose. During dry friction, the sample will change under the action of pressure and friction. Part of the slip occurs due to the movement of the friction head, which increases the friction resistance and improves the friction efficiency.

3. The influence of the chemical structure of reactive dyes

There are certain differences in the covalent bond strength, bond stability and adhesion between reactive dyes of different chemical structures and cellulose fibers, but there is no significant difference in the effect on the color fastness to wet rubbing of dyed fabrics.

4.The influence of the degree of dyeing of reactive dyes The color fastness to wet rubbing of reactive dyed fabrics is closely related to the depth of dyeing, that is, when wet rubbing, the amount of color transfer and the depth of dyeing are almost in a good linear relationship. Excessive dyes cannot be combined with fibers, but can only accumulate on the surface of the fabric to form a floating color, which seriously affects the color fastness to wet rubbing of the fabric.

5. The effect of softening agent Improve the color fastness of reactive dye printing through soft finishing. The softener has a lubricating effect and can reduce the coefficient of friction to prevent the dye from falling off. Cationic softeners can also form lakes with anionic dyes, and the dyes are not easy to fall off. At the same time, the color lake reduces the solubility of the dye and improves the wet rubbing fastness. However, softeners with hydrophilic groups are not conducive to the improvement of wet rubbing fastness.