Acid dyes are a class of dyes dyed in an acid medium. Most acid dyes contain sulfonic acid groups and a few contain carboxyl groups.

According to different structures, it can be divided into azo dyes, anthraquinone dyes, triarylmethane dyes and nitro dyes.

According to the different dyeing methods, it can be divided into strong acid, weak acid, acid mordant dyes and acid complex dyes.

Acid dyes are easily soluble in water, and the hardness of the water and the height of the slurry temperature have little effect on the dyeing effect.

Compared with basic dyes, its coloring ability and color vividness are worse than that of basic dyes, but it has strong light resistance and heat resistance, and its resistance to acids, alkalis, and chloride ions is relatively poor.

Acid paper dyes are highly soluble in water, have strong negatively charged groups, and have low affinity for fibers. When dyeing, alumina is used as a mordant to encourage the dye to stay on the fibers. Therefore, acid dyes must be added with acid and alum. Add rosin and alum to the pulp before mixing the pulp and fiber evenly.

Acid dyes have a strong affinity for protein fibers, so it is suitable for leather dyeing.

Acid dyes have no affinity for lignin, so it will not produce stains when dyeing mixed pulp.

Temperature has little effect on acid dyes, and the pH value during dyeing is 4.5～5.0.

The representative dyes of acid dyes used in papermaking are Acid light Yellow G, Acid Anthraquinone Blue, Acid sky blue, Acid Scarlet G, Acid Scarlet GR, Acid Golden G and acid orange 7. Welcome your inquiry for more paper dyes.

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