Classification of Solvent Dyes

NEW YORK - Dec. 6, 2018 - PRLog -- Solvent dyes are a class of dyes that are soluble in organic solvents. And the dye structure contains less or no hydrophilic groups, so the solvent dye is insoluble in water but soluble in different types of organic solvents. Solvent dyes are used for dyeing organic solvents, hydrocarbon fuels, waxes, lubricants, plastics, and the like. According to the composition and structure, solvent dyes can be classified into the following types:

Basic dyes

Such solvent dyes include Yellow 34, Orange 3, Red 49, Violet 8, Violet 9, Green 1, Brown 41 and so on. These solvent dyes remove the -CL from the basic dye structure to from a free base form, increasing its solubility and stability in the solvent. Such solvent dyes are generally used in the dyeing of oils, re-wrapping bags, packaging bags and resins. Some solvent dyes are also used for the coloring of ball-point pen oils and plastics. Due to the low thermal stability and poor weather resistance of this type of solvent dyes, their use range is limited.

Complex precipitation of basic dyes with acid dyes

The varieties of such dyes are: Solvent Red 109 (obtained by co-precipitation of Acid Yellow 99 and Basic Violet 10); Solvent Red 35 (obtained by co-precipitation of Acid Violet 58 and Basic Violet 10); Solvent Red 229 (obtained by co-precipitation of by Acid Yellow 23 and basic red 1); solvent violet 2 (obtained by co-precipitation of acid violet 56 with basic violet 10). These dyes are obtained by the reaction of an anionic acid dye and a cationic basic dye. This reaction makes such dyes electrically neutral, increases their solubility in solvents, and improves their heat resistance and weather resistance. These dyes are very soluble in alcohol solvents and are high-grade dyes for clear lacquers and inks.

Metal complex solvent dyes

The metal complex solvent dye is a metal complex which is soluble in an organic solvent. It is a complex of 1:1 and 1:2 azo and metal with no or less hydrophilic groups. The varieties of such solvent dyes include Solvent Yellow 21; Orange 45, 54, 56, 62; Red 8, 100, 122; Black 27, 34, 35; and the like. These dyes are composed of acidic metal complex structures, which have good thermal stability, heat resistance (about 200°C), acid resistance, alkali resistance and light fastness. They also have good solubility in solvents, so they can be used for the dyeing of high-grade furniture transparent paint, automotive paints, plastic and polyester protoplasm.

Disperse dyes

Such dyes incorporate a long-chain alkyl compound based on the structure of the disperse dye to increase the solubility of the disperse dye in the solvent. There are many varieties of such solvent dyes, including Disperse yellow 1 (https://www.alfa-chemistry.com/cas_119-15-3.htm), 3, 4, 11; Disperse orange 3, 11, 13, 25; Disperse red 1, 5, 9, 15, 22, 98, 227; Disperse violet 1, 4, 26, 28; Disperse blue 1 (https://www.alfa-chemistry.com/disperse-blue-1-cas-2475-4...), 7, 14, 19, 134. The disperse dye itself is insoluble in water, but when a long-chain alkyl group compound is introduced, its solubility in a solvent is increased. They are widely used in the coloring of plexiglass, plastic, ABS resin, and polyester protoplasm.