Disperse Red Dyes
Hyperchromic dye
After the vat dye is reduced and dissolved into sodium salt of cryptochrome by sodium sulfate and caustic soda, it will produce a direct effect on the cellulose fiber, first adsorb on the surface of the fiber, and then spread to the inside of the fiber to complete the dyeing of the fiber. Because there are a lot of electrolytes in the dye solution, it is more direct to the fiber, so the dyeing speed of the fiber is faster, and the migration performance of the dye is poor, so it is not easy to dye evenly. Therefore, a small amount of retarding agent can be added in the dyeing process, such as flat adding 0, kraft glue, etc.
[O]
Cryptochrome oxidation
The saphenous body of the dyed fiber needs to be oxidized by air or oxidant to change into the original insoluble vat dye and restore the original color. The oxidation reaction is as follows:
≥C－ONa －→ >C=O
As different types of vat dyes have different oxidation properties, the appropriate oxidation conditions should be selected, such as air oxidation, hydrogen peroxide, sodium perborate oxidation, etc.
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