Denim clothing is deeply loved by consumers for its unique style. However, the wet rubbing fastness of denim fabrics is relatively low. For example, AATCC, ISO and national standards stipulate that the wet and dry rubbing fastness of children's denim fabrics can reach 2~3 grades as qualified products. With the advancement of society, the people's yearning for health and safety has put forward higher requirements for denim fabrics, forcing denim manufacturers and denim washing companies to make continuous efforts to improve the wet rubbing fastness of denim.

◆ Factors affecting the wet rubbing fastness of denim fabrics

① Color depth: The darker the color of the fabric, the more the amount of dye, the more likely the sample to be tested will diffuse and transfer the dye, and the worse the wet rubbing fastness of the dyed fabric will be.

② The characteristics of the dye The higher the directness of the indigo dye molecule, the larger the molecular weight of the dye, the stronger the polarity, the better the structural regularity, and the worse the diffusion performance. The dye is more likely to accumulate on the surface of the fabric and is not easy to diffuse into the fiber. Transfer, causing excessive floating color. If the directness is too low, it will affect the fixation rate.

③ The effect of floating color floating color includes dyes that have been adsorbed on the fiber and did not participate in the fiber reaction and dyes hydrolyzed on the surface of the fiber. These dyes are easily detached from the fabric when subjected to a relatively external force, thereby affecting the wet friction of the dyed fabric. Spend.

④ The texture and surface finish of the grey fabric The texture of the fabric affects the smoothness of the fabric surface. The smoother the fabric surface, the smaller the friction force it receives during the friction test and the less likely it is for the dye to fall off.

⑤ The effect of water quality The indigo dye that does not react with the fiber, the insoluble matter combined with calcium, magnesium ions or other salt substances in the water, deposits on the surface of the fabric by physical adsorption to form a lake, which affects the wet friction of the dyed fabric. Spend.

◆ Measures to improve the wet rubbing fastness of denim fabrics

1. In order to obtain better results for dark fabrics, choose a suitable wet rubbing fastness enhancer, use the film-forming properties of polymer additives to cover the fiber surface, reduce the friction of the fabric surface, and improve the wet rubbing fastness level , Hongsheng's wet and dry rubbing fastness enhancer HS-201 can effectively improve the dry and wet rubbing fastness of denim fabrics.

2. Select the appropriate indigo dye to improve the efficiency of the combination of dye and fiber, strengthen the sufficiency of the chemical bond between the dye and the fiber, and reduce the amount of physically adsorbed dye inside and outside the fiber. The directness is moderate.

3. Choose good grey fabrics, try to ensure that the cloth surface is as smooth as possible, and at the same time strengthen the detection and control of water quality, strengthen the pre-treatment of the fabric, optimize the dyeing and finishing process, and carry out sufficient washing and soaping to wash away the floating color and fiber debris.