Lots Method of Chemicalisation of Dyestuffs

There are seven common dyes on the market today and today we will take a brief look at how these seven dyes are made.

I. Direct dyes:

Direct dyes have relatively good heat resistance stability, and soda ash soft water can be added to to help dissolve. Chemical material first with cold soft water to blend the dyes into a slurry, and then boil soft water to stir dissolution, heat water dilution, cool and add water to the prescribed amount of liquid.

Ⅱ Reactive dyes:

This type of dyestuff is not heat-resistant, high temperature is easy to hydrolysis, so we need  to use cold soft water to blend into a slurry, and then use the appropriate temperature of soft water to dissolve according to the hydrolysis stability of different dyestuffs , heating soft water dilution, after cooling add soft water to the prescribed amount of liquid.

Low temperature type (X type): use cold water or 30-35°C warm water (basically eliminated)

High temperature type (K type, HE type, etc.) with 70-80℃ hot water

Medium temperature type (KN, M type) with 60-70 ℃ hot water

90 ℃ hot water for small solubility

III. Reduction dyes:

The dissolution process of reducing dyestuffs is a reduction reaction process. When dissolving, the dissolution temperature should be determined according to the reducing conditions of the reducing agent used. For example, the common reducing agent for reducing dyes is insurance powder, the best temperature for use in solution is 60 ℃, too high a temperature will lead to the decomposition of a large number of insurance powder.

(1) Full bath method:

The dye is put into the dye cup, red oil and a small amount of warm soft water are added successively to mix, then the required amount of caustic soda and insurance powder are added, then soft water is added to the required bath amount and the dye is reduced at 55°C.

(2) Dry vat method:

Put the dye into the dye cup, add red oil and a small amount of warm soft water successively to mix well, then add two-thirds of the amount of caustic soda and insurance powder to make the amount of dye solution one-third of the total, to determine the dissolving temperature according to the reducing conditions of the reducing agent used. Add the remaining caustic soda and insurance powder to the dyeing cup and add soft water to the required bath volume.

IV. Sulphur dyes:

Accurately weigh the required amount of dyestuff in a beaker, mix into a slurry with cold soft water, then add the pre-dissolved sodium sulphide dye solution, boil for 10min. heat soft water to dilute, add soft water to the required amount of liquid after cooling.

V. Disperse dyes:

The temperature is too high disperse dyestuff easy crystallization precipitation. Material should first use cold soft water to adjust the slurry, then use cold soft water below 40 ℃ to make material, add soft water to the required amount of liquid.

Ⅶ Acid dyes:

Acid dyes have relatively good heat resistance and stability, acid dyestuff material, first use cold soft water to adjust the dyestuff into a slurry, and then boiling soft water to stir dissolved, heated soft water dilution, cooling, plus soft water to the required amount of liquid.

Ⅷ.Ationic dyes:

Cationic dyestuff is relatively good heat resistance stability, when the material first use concentrated acetic acid (help soluble) to blend the dyestuff into a slurry, and then rushed boiling soft water stirring dissolved, heated water dilution, after cooling add soft water to the prescribed amount of liquid.

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