1. Direct dyes:
Direct dyes have relatively good heat resistance and stability. Soda ash and soft water can be added to direct dyes to help dissolve them. When making materials, first use cold soft water to make the dye into a slurry, then boil the soft water to stir and dissolve, dilute with heated water, and cool. Then add water to the specified liquid volume.
2. Reactive dyes:
This type of dye is not heat-resistant and is easily hydrolyzed at high temperatures. It is best to use cold soft water to make a slurry. Then use soft water of a suitable temperature to dissolve according to the hydrolysis stability of different dyes, and then dilute with heated soft water. After cooling, add soft water to the specified liquid volume.
Low temperature type (X type): use cold water or 30-35℃ warm water (basically eliminated)
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High temperature type (K type, HE type, etc.) uses 70-80℃ hot water
Medium temperature type (KN, M type) uses 60-70℃ hot water
Use 90 ℃ hot water if the solubility is small
3. Vat dyes:
The dissolution process of vat dyes 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 commonly used reducing agent for vat dyes is insurance powder. The best use temperature in the solution is 60°C. Excessive temperature will cause a large amount of insurance powder to decompose.
(1) Full bath method:
Put the dye into the dyeing cup, add red oil and a small amount of warm soft water and mix thoroughly, then add the specified amount of caustic soda and insurance powder, add soft water to the required bath volume, at 55 Restore at ℃.
(2) Dry cylinder method:
Put the dye into the dyeing cup, add red oil and a small amount of warm soft water and mix thoroughly, then add two-thirds of the amount of caustic soda and insurance powder, so that the amount of dye solution is one-third of the total amount. The dissolution temperature should be determined 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.
4. Sulfur dyes:
Accurately weigh the required amount of dye into a beaker, use cold soft water to make a slurry, then add the pre-dissolved sodium sulfide dye solution and boil for 10 minutes. Heat soft water to dilute, add soft water to the specified liquid volume after cooling.
5. Disperse dyes:
If the temperature is too high, disperse dyes tend to crystallize and precipitate. When mixing the material, it is advisable to use cold soft water to mix the slurry first, then use cold soft water below 40°C to mix the material, and add soft water to the specified liquid volume.
6. Acid dyes:
Acid dyes have relatively good heat resistance and stability. When converting acid dyes, first use cold soft water to make the dye into a slurry, then boil the soft water, stir and dissolve, heat the soft water to dilute, and cool Then add soft water to the specified liquid volume.
7. Cationic dyes:
Cationic dyes have relatively good heat resistance and stability. When mixing, first use concentrated acetic acid (dissolving agent) to make the dye into a slurry, then boil soft water, stir and dissolve, and dilute with heated water. , add soft water to the specified liquid volume after cooling.
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