First, direct dye:

The heat stability of direct dye is relatively good, direct dye can be added to soda ash soft water to help dissolve, melt material with cold soft water to adjust the dye into a slurry, then rinse boiling soft water to stir to dissolve, heating water dilution, cooling after adding water to the specified amount of liquid.

Two, reactive dye:

This kind of dye is not heat resistant and easy to hydrolyze at high temperature. It is appropriate to use cold soft water to make slurry, and then dissolve in soft water at appropriate temperature according to the hydrolysis stability of different dyes, dilute by heating soft water, and add soft water to the specified amount of liquid after cooling.

Low temperature type (X type) : Use cold water or warm water at 30-35 ℃ (basically eliminated)

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

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

Low solubility with 90 ℃ hot water

Three, reducing dye:

The dissolving process of reducing dye is a reduction reaction process. When dissolving, the temperature of dissolving should be determined according to the reducing conditions of the reducing agent used. Such as reducing dye commonly used reducing agent is insurance powder, the best use temperature in solution is 60℃, the temperature is too high will lead to a large number of insurance powder decomposition.

(1) Full bath method:

Put the dye into the dyeing cup, add red oil and a small amount of warm and soft water to mix well, then add the prescribed quantity of caustic soda and insurance powder, then add soft water to the required bath amount, and reduce at 55℃

(2) Dry cylinder method:

Dye into the dyeing cup, successively add red oil and a small amount of warm soft water to mix, and then add caustic soda and insurance powder dosage of two thirds, so that the amount of dye for one third of the total amount, according to the reducing conditions used to determine the temperature of dissolution. Add the remaining caustic soda and insurance powder to the dyeing cup, and add soft water to the desired amount of bath.

Four, sulfide dye:

Accurately weigh the required amount of dye in a beaker, use cold soft water to make a slurry, then add the sodium sulfide dye solution that has been dissolved in advance, and boil for 10min. Dilute with soft water by heating. After cooling, add soft water to the specified amount.

Five, disperse dye:

The disperse dye is easy to crystallize when the temperature is too high. Chemical material should first use cold soft water slurry, and then use cold soft water material below 40℃, add soft water to the specified liquid amount.

Six, acid dye:

Acid dye heat stability is relatively good, acid dye material with cold soft water to adjust the dye into a slurry, and then boiling soft water stirring dissolved, heating soft water dilution, cooling after adding soft water to the specified amount of liquid.

Seven, cationic dyes:

Cationic dyes have relatively good heat stability. When the material is mixed, the dye is adjusted into a slurry with concentrated acetic acid (solubilization), and then dissolved in boiling soft water, diluted by heating water, and cooled by adding soft water to the specified amount of liquid.