Acid dyes, cationic dyes, and vat dyes are suitable for fur dyeing.

1. The basic principle of fur dyeing

The principle of fur dyeing is similar to dyeing other materials. There is a certain adsorption effect between dye molecules and cellulose molecules, which adsorbs dye molecules onto cellulose molecules and forms colored cellulose molecules.

The difference between fur and other cellulose materials is that the fur surface has disulfide bonds, which can form more stable bonds with dyes, making fur dyeing more firm.

2.Types and characteristics of dyes suitable for fur dyeing 1. Acid dyes

Fur belongs to protein cellulose and has good adsorption capacity for acidic dyes. Acid dye molecules contain negatively charged carboxyl groups, which combine with positively charged amino acid residues on the surface of fur to form stable dye complexes. After the dye molecules are converted into positively charged fluorescent ions, the other end of the dye molecules continues to adsorb onto the surface of the fur, forming several ion pairs and continuously increasing the dyeing amount, resulting in better dyeing effect and higher fastness.

2. Cationic dyes

Cationic dye molecules are positively charged and have good ability to bind with thiol groups on the surface of fur, resulting in good dyeing effect and high color fastness.

3. Vat dyes

Vat dyes do not need to be under special pH conditions to dye. Their dyeing molecules gradually reduce under the action of reducing agents, releasing functional groups with adsorption and dyeing abilities, thus forming a strong bond with the surface of fur. Vat dyes require the use of reducing agents during the dyeing process, followed by acid washing and final neutralization treatment with acidic chemicals during the post-treatment process.

In summary, the types of dyes suitable for fur dyeing include acid dyes, cationic dyes, and vat dyes. Each has its own characteristics, and the specific choice should be determined based on the product requirements and the desired effect of production.

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