A kind of preparation method of the composite indigo dye of novel premixed reducing agent

Abstract

The invention relates to a preparation method of a novel composite indigo blue dye of a premixed reducing agent and belongs to the field of fine chemical engineering science. A reducing agent, an indigo blue dye and an additive are premixed according to a certain proportion and are ground in a dry mode, ground in a wet mode and dried through a ball mill to prepare the composite dye, and the appearance of the finally-obtained composite dye is in a powder form. The obtained novel composite indigo blue dye of the premixed reducing agent is applicable to the cellulosic fiber dyeing process; compared with a traditional single indigo blue dye, no reducing agent needs to be added to the composite dye in the later-period dyeing process, the composite dye contains no sodium hydrosulfite, the safety production coefficient can be improved, the later-period wastewater treatment pressure is lowered to the maximum, and even the cost of the wastewater aftertreatment process is reduced to be lowest by recycling and reusing wastewater and drying and recycling dye powder. The novel composite indigo blue dye of the premixed reducing agent is low in preparation cost, simple in technological process and stable in product quality, thereby having the potential application value.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a preparation method of a composite indigo dye with a novel premixed reducing agent. Background technique [0002] Indigo dyeing, as a commonly used vat dye, is widely used in the dyeing process of cellulose fibers. However, there are two main problems in the vat dyeing process of indigo: [0003] (1) In the existing industrialized vat dyeing process of indigo, sodium hydrosulfite is mainly used as the reducing agent. The dyeing process is complicated, and the stability of the hydrosulfite is poor. waste water, causing environmental pollution, forcing enterprises to greatly increase the cost of storage of flammable and explosive chemicals and the cost of treating waste water after dyeing, which greatly reduces the application value of dyes. Reasonable green replacement of hydrosulfite in the dyeing process can reduce the cost of safe storage of reaction raw m...

AI Technical Summary

Problems solved by technology

[0004] (2) Most of the existing indigo dyes have large particle sizes and irregular particle shapes, which greatly affect the reactive specific surface area value in the particles

[0005] Although superfine indigo dye suspensions, powders and even liquid dyes can be prepared by methods such as ultrasonic waves, which can reduce the amount of sodium hydrosulfite, increase dye uptake and improve the color fastness of fabrics to a certain extent, but it is not essential. Did not solve the problems of sodium hydrosulfite substitution and simplification of technological parameters in the dyeing process of enterprises