Light fastness of textile fabrics
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Light fastness of textile fabrics
1. Light fastness test method
Light fastness The color fastness test refers to placing a textile sample and a set of standard samples together under artificial light sources for exposure under specified conditions, and then comparing the discoloration of the two to evaluate the color fastness.
2. Ways to improve light fastness
Photofading mechanism of dyes It is very complex, but the main reason is that the dye is excited after absorbing photons, and a series of photochemical reactions occur to destroy the structure, resulting in discoloration and fading. The light fastness of textiles mainly depends on the chemical structure of the dye, as well as its aggregation state, combination state and mixed color matching. Therefore, the rational selection of dyes is very important.
3. Select dyes according to fiber properties and textile uses
For cellulose fibers For textiles, dyes with better oxidation resistance should be selected; for protein fibers, dyes with better resistance to reduction or containing weak oxidative additives should be used; for other fibers, dyes should be selected based on their impact on fading.
4. Dyes should be selected according to color depth
A large number of tests have proven that reactive dyes The color fastness to light on cellulose fibers is proportional to the depth of the dye, that is, the darker the color, the better the color fastness to light. On the contrary, the lighter the color, the dye is mostly highly dispersed on the fiber and has a higher chance of being exposed to light, which ultimately leads to a significant decrease in light fastness. Therefore, when dyeing light-colored varieties, dyes with higher light fastness should be used. In addition, many finishing agents such as softeners and anti-wrinkle finishing agents are added to the fabric, which will also reduce the light fastness of the product. Therefore, dyes that are not sensitive to these finishing agents should be used.
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