How to improve the color fastness of fabrics?

The color fastness of textile products (hereinafter referred to as color fastness) refers to the fading degree of dyed or garment printed fabrics under the action of external factors (extrusion, friction, cleaning, rain, exposure, sunlight, seawater immersion, saliva immersion, water stains, sweat stains, etc.) in the process of use or production. It is an important technical index of fabrics. Good color fastness, textile products are not so easy to fade in the whole process of post production, processing or use; Poor color fastness will lead to fading, slight color, or staining, resulting in a lot of inconvenience.

1. the most common problems of color fastness of textile products

It is learned from clothing micro production and processing that the most common color fastness problems of textile products in routine sampling inspection and consumer complaints are as follows:

1.1 the sun fastness is not up to standard.

1.2 color fastness to washing, soaping and dry cleaning are not up to standard.

1.3 color fastness to rubbing is not up to standard.

2. Factors affecting color fastness and improvement methods

Products with poor color fastness fade in the whole wearing process, which will affect other clothes on the body, or stain other clothes when cleaning with other clothes, affecting the beauty and wearing performance; At the same time, good or bad color fastness can also directly affect the safety and health of the body. The dye molecular structure and heavy metal ions on products with poor color fastness may be absorbed by the body through the skin and endanger the skin, or even damage the health of the body.

2.1 selection of dyes and chemicals

The selection of dyes and chemicals is very important to the color fastness of a product. If the selection of dyes and chemicals is not appropriate, no matter how good the additives and dyeing process are, there is no way to dye high-quality color fastness.

2.1.1 select dyes according to the characteristics of fibers

Different types of dyes have different binding forms with fibers, and the firmness of binding bonds is also different. After the dye type is determined, the dyes with high dyeing performance shall be selected.

2.1.2 select dyes according to color depth

After clarifying the category of dyes, it is necessary to further clarify which dye to use according to the color system and depth of the dyed color. First, choose the dye whose color light is close to the required color as far as possible. If there is any deviation, color it with other dyes. Second, look at the color fastness index of the selected dye itself. Finally, see whether the dye saturation can achieve the required color depth.

2.2 selection and use of additives

2.2.1 select appropriate additives

The selection of additives is also very important after determining the variety of dyes. Generally, the auxiliaries matched with dyes shall be selected as far as possible. If ordinary dyes are used routinely, the dosage and application method of auxiliaries shall be emphasized. Compared with dark color, dyes are not easy to absorb. Additives can be added in batches to improve the absorption rate. It can also improve the firmness of dye adsorption and play the role of color fixation.

2.2.2 selection of color fixing agent

The use of color fixing agent will greatly improve the color fastness of dyes, generally at least 0.5 ~ 1 grade, but the color fastness of dyes should be considered when selecting color fixing agent. Instead of just looking at individual items. For example, after reactive dyes are treated with cationic low molecular weight or polyamine color fixing agent, the water washing fastness of the fabric is grade 4 ~ 5, but the sun fastness will decline. When fixing, the amount of fixing agent, fixing temperature and fixing time must be strictly controlled. Formaldehyde free color fixing agent jv-602c is a polymer synthesized by special process. It is an environmental protection product without formaldehyde, special smell and irritation.

The fabric treated with aldehyde free color fixing agent jv-602c can significantly improve various color fastness indexes.