Direct Yellow 12

Direct Yellow 12

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Direct Yellow 12 is a kind of direct dye. Direct Yellow 12 can be directly dissolved in water and has high directness to cellulose fibers. It does not require the use of chemical methods to color fibers and other materials. Direct Yellow 12 can color wool and silk in weak acid or neutral solution, and can also be used for dyeing cotton, linen, rayon, and rayon. The disadvantage is that the washing and light fastness is not ideal.

Other name: Chrysophenine GX/Direct yellow G

C.I. 24895

CAS NO.: 2870-32-8

EINECS No.:220-698-2

MF: C30H26N4Na2O8S2

Molecular weight: 680.67

Dissolution: soluble in water.

Preparation of Direct Yellow 12:

Direct Yellow 12 is formed by diazotizing DSD acid and coupling with two molecules of phenol, and then converting the hydroxyl group on the phenol into ethoxy group through ethyl chloride.

The nature of Direct Yellow 12:

1. Use Direct Yellow 12 dye. One gram is dissolved in 50 ml of water. When the temperature is ≤15℃, it becomes a jelly, hence the name Frozen Yellow.

2. Direct Yellow G dyes cellulose fibers. Direct Yellow 12 has good exhaustion performance, the temperature is 40℃, and the affinity is the largest, and the discharge performance is very good.

Uses of Direct Yellow 12:

Direct Yellow 12 is mainly used in the dyeing of cellulose fiber fabrics such as cotton, linen, and rayon, and fabrics such as trampled polyester.

Direct Yellow 12 can also be used for dyeing leather, pulp, and biology;

Direct Yellow 12 can also be used to make lakes and pigments.

The characteristics of direct dyes:

Direct dyes have water-soluble groups such as sulfonic acid group (-SO3H) or carboxyl group (-COOH) arranged in a linear structure. The aromatic ring structure is in the same plane, so the direct dye has a greater affinity for the cellulose fiber. It can be dyed directly in a neutral medium. As long as the dye is dissolved in dry water, it can be dyed.