How to improve the wet rubbing fastness of fabrics?

The rubbing fastness of dyed fabrics is divided into dry rubbing and wet rubbing. The former is to rub the dyed fabric with a dry white cloth to observe the staining of the white cloth, and the latter refers to the rubbing of the dyed fabric with a white cloth with a moisture content of 95% to 100% (according to GB/T3920-1997) to observe the staining of the white cloth. The friction fading of the fabric is caused by the falling off of the dye under the action of friction. In addition to the action of external force, the wet friction also adds the action of water. Therefore, the wet rubbing fastness is generally lower than the dry rubbing fastness.

The rubbing fastness of the fabric depends on the amount of floating color, the combination of dye and fiber, and the uniformity of dye penetration. Such as reactive dyes, the dye and fiber are covalently bonded, and the dry rubbing fastness is high.On the contrary, like insoluble azo dyes, when the dyeing treatment is not good, part of the dye becomes insoluble and mechanically adheres to the surface of the fiber, then rubbing The fastness is low.

If the dyeing concentration is high, it is easy to cause floating color, and the rubbing fastness is low. The rubbing fastness was carried out on the rubbing fastness tester, and the “dye fastness staining gray sample card” was used for comparison and rating. The rubbing fastness is also divided into 5 grades. Grade 1 is the worst, staining is the most serious; Grade 5 is the best.