Leather Dyes Specialized Manufacturer

Ltd. is an acid dyes, direct dyes, leather dyes, feed additives and other chemical raw materials manufacturers, products are mainly used in leather, wool, tweed, silk, paper, wood, metal and other industry sectors.

Classification of Acid Dyes


Abstract

Acid dyes. The earliest developed acid dyes required dyeing in a strongly acidic dye bath. Their molecular structure is simple, with low molecular weight, and they contain sulfonic or carboxyl groups, which have low affinity for wool. They can move evenly on wool, resulting in uniform dyeing, and are also known as acid leveling dyes. However, the colors are not deep, the wash fastness is poor, and they can be harmful to wool during dyeing, resulting in a poor hand feel after dyeing. An example is Acid Red G (C.I. Acid Red 1).

1) Acid dyes. The earliest developed acid dyes need to be dyed in a strongly acidic dyeing bath. Their molecular structure is simple, with low molecular weight, containing sulfonic acid or carboxyl groups, and have low affinity for wool. They can move evenly on wool, resulting in uniform dyeing, also known as acid leveling dyes. However, the colors are not deep, wash fastness is poor, and they are harmful to wool during dyeing, resulting in a poor hand feel after dyeing. For example, Acid Red G (C.I. Acid Red 1).

(2) Acid dyes. Weak acid dyes can be produced in strong acid dyes by increasing molecular weight, introducing aromatic sulfonyl groups, or introducing long carbon chains. The molecular structure is complex, with strong affinity for wool. They can dye wool in weak acidic media without damaging the wool, with deep color and improved fastness, but the dyeing is uneven.

(3) Acid mordant dyes. An acid dye that forms metal complexes on the fabric after treatment with mordants such as chromium salts and copper salts. Acid mordant black T (C.I.) is a mordant with good lightfastness, washfastness, and abrasion resistance. Media Black 11).

(4) Acid dyes are formed by some acid dyes complexed with chromium, cobalt, and other metals. They are water-soluble and have good light and sunlight resistance. No mordant is needed during dyeing. For example, Acid Complex Yellow GR (C.I. Acid Yellow 99).

Guidelines for selecting acid dyes:

Acid dyes are only suitable for positively charged fibers, such as polyamide fibers dyed in an acid bath, but cotton fibers can also be dyed with cationized acid dyes. Increasing the number of cationic groups on cationic cotton can achieve better wash fastness. In any case, the overall color fastness of cationic cotton dyed with acid dyes is comparable to that of nylon 6 dyed with the same acid dyes.