Uncover the various factors affecting the color fastness of textiles

Textile dyeing fastness (referred to as color fastness) refers to the degree of color fading of dyed or printed fabrics under the action of external factors (extrusion, friction, washing, rain, exposure, light, seawater impregnation, saliva impregnation, water stains, perspiration and so on) in the course of use or processing, which is an important index of fabrics. Color fastness is good, textiles in the post-processing or use of the process is not easy to lose color; color fastness is poor, there will be color loss or staining and so on, causing a lot of trouble.

The most common textile color fastness problems

 

Failure of sunlight fastness: coat clothing in the wearing process, by the sunlight irradiation of more parts of the color becomes lighter or discoloration (generally back and shoulder parts), and irradiation or irradiation of less than the color of the place unchanged or changes in the light, resulting in the original color of the same color of the product color varies in color, and can not be continued to use.

Failure of color fastness to washing, soaping and dry-cleaning: clothing fades after washing. Silk garments, wool garments and cotton garments are most likely to have such problems.

Failure of color fastness to friction: textiles in the process of use, because different parts of the product are subjected to different degrees of friction, the degree of color loss is different. For example, the elbows, collars and underarms of tops and sleeves are most prone to color loss. In addition, the hip and knee areas of pants are also prone to color loss.

Failure of color fastness to perspiration: mainly summer clothes or close-fitting underwear when wearing, by the sweat impregnation and color loss.

Factors affecting the color fastness of textiles

There are many factors affecting the color fastness of dyed products, but they mainly depend on the chemical structure of dyes, the physical state of dyes on fibers (the degree of dispersion of dyes, the combination with fibers), the concentration of dyes, the dyeing method and the process conditions, etc.; the nature of fibers has a great relationship with the dyeing fastness as well.

Influence factors of color fastness to rubbing

The color fastness to rubbing is also called color fastness to friction. Its influencing factors are mainly the structure and performance of dyestuffs, the organizational structure of different fibers and fabrics, and the dyeing process.

Reactive dyes contain hydrophilic groups such as sulfonic acid group, textile dyes if the dyes are not sufficiently washed, there will be more unsolidified dyes on the fibers, when the dyes with high water solubility are easy to drop the color and stained on the friction fabrics; the dyes with high directivity are more difficult to diffuse into the interior of the fibers, which causes floating color on the surface of the textile, and it is easy to drop the color.

The morphology and structure of fiber are different, and the color fixation rate of dyes is different. High color fixation rate, the amount of hydrolyzed dye is small, the floating color is easy to wash away, the friction color fastness is good; smooth fiber surface, flat tissue structure and low coefficient of friction, the friction color fastness is good. Generally speaking, the friction color fastness of regenerated cellulose fiber (Modal, Tencel and viscose fiber) textiles, especially wet friction color fastness is better than natural fiber cotton. The organizational structure of the fabric also has a great influence on the color fastness to rubbing: the size of the coefficient of friction is in the following order: Plain fabrics > Twill fabrics > Woven fabrics.

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