Reducing agent for dyeing reduced dyes

Abstract

The invention discloses a reducing agent for dyeing reduced dyes, belonging to the technical field of printing and dyeing technologies for textiles. The reducing agent consists of the following raw materials in percentage by mass: 5-10 percent of thiourea dioxide, 5-30 percent of sodium hydrosulfite 10-40 percent of reducing sugar type substances and 20-50 percent of salt. The reducing agent disclosed by the invention can effectively replace the sodium hydrosulfite to be used for dyeing of the reducer dyes and indigo dyes, the reduced dye leuco is long in existence time and slight in environment pollution, and the price of the dye leuco is superior to that of the sodium hydrosulfite. Moreover, the thiourea dioxide contained in the reducing agent for dyeing reduced dyes disclosed by the invention can be completely biodegraded, is high in reducing capacity, can effectively reduce the dyes into leuco, does not have a pungent smell and belongs to an environment-friendly substance; the reducing sugars refers to substances existing in the nature and have a certain reducing property, and the overall reducing capacity can be maintained and last for a long time; and moreover, according to salt substances, the stability of the components of the whole reducing agent can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of textile printing and dyeing, and in particular relates to a reducing agent for vat dye dyeing. Background technique [0002] In the existing field of textile printing and dyeing, when vat dyes are used to dye cotton cloth, because the vat dyes are not soluble in water, a reducing agent is needed to reduce them to water-soluble leucos, which can quickly enter the fabric fibers. Then it is oxidized back to its original color to achieve the effect of dyeing. In this process, the role of reducing agent is very important. In the existing field, generally only sodium hydrosulfite is used as the reducing agent, and the chemical name of sodium hydrosulfite is sodium dithionite, which is unstable in nature, easy to decompose, easy to generate heat when exposed to moisture, and there are many invalid decompositions during use, leuco The maintenance time is short, so it is necessary to reduce the amount of hydrosu...

AI Technical Summary

Problems solved by technology

In the existing field, generally only sodium hydrosulfite is used as the reducing agent, and the chemical name of sodium hydrosulfite is sodium dithionite, which is unstable in nature, easy to decompose, easy to generate heat when exposed to moisture, and there are many invalid decompositions during use, leuco The maintenance time is short, so it is necessary to reduce the amount of hydrochloric acid used or find a chemical substance that can replace it

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