Dye compound reducing agent and method of using the same

Abstract

The invention discloses a composite reducing agent for dye, comprising the following compositions in weight portion: 8 to 20 portions of vat powder, 5 to 40 portions of thiourea dioxide, and 5 to 15 portions of sodium sulfite. The invention also discloses a method for dyeing by the reducing agent, comprising the following steps that: a reducing agent and sodium hydrate are used for reducing the dye by a vatting method; the weight ratio of a reducing solution to the dye is 37.5: 0.8 to 2.0 and the mixture is for later use; a leveling agent and the fiber penetrating swelling agent are added to dye or a buffering agent is added to adjust the pH value and is dyed by vat acid, the temperature is reduced and the mixture is washed; the mixture is subjected to oxidization to develop color, fixing, reducing temperature and washing; the fresh water bath is performed, the dye composite reducing agent is reduced and washed, and the temperature is reduced and the fiber penetrating swelling agent is produced. The composite reducing agent for the dye is a special reducing agent used for reducing the dye, a sulfur dye, a perylene dye and a leuco body, and improves the stability of the leuco body, color yield percentage, the color reproducibility, the color fixation and the color evenness degree, meanwhile, the dye composite reducing agent avoids the harm of formaldehyde on the environment and the human body.

Description

technical field [0001] The invention relates to a dye compound reducing agent and a dyeing method thereof, belonging to the technical field of fiber dyeing, especially the technical field of dyeing with vat dyes. Background technique [0002] Vat dyes have good color fastness, especially good color fastness to sunlight and soaping, but there are still some problems such as poor permeability, suspension dyeing color flower and unstable leuco body when dyed with leuco acid and leuco body. The problem is not resolved. [0003] The vat dye leuco dyeing method is to turn the insoluble vat dye into a water-soluble dye through alkali treatment, but at this time, the dyed sodium salt is no longer the original color, so it is called leuco, and the dye leuco is dyed The method is called leucosome staining. After dyeing, use the oxidation method to return to the original insoluble color development state. Leuco dyeing with traditional vat dyes, because the pH is around 12.0, will ca...

AI Technical Summary

Problems solved by technology

Some foreign related patents have made some improvements in solving the above problems, but there are certain problems: R.C.SHAH (Textile Chemist and Colorist, VOL4, No11, NOV7, 1972, P59-61) can delay the oxidation rate of hydrosulfite by adding protective colloid , thereby increasing the stability of vat dye leucosomes and leuco acids

However, due to the aggravation of polyester microfiber damage caused by high temperature, the strength of leather is reduced, and at the same time, the energy consumption in production is high. This means of improving color fastness by temperature is greatly limited.

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