A kind of fabric indigo dyeing method

Abstract

The invention provides a fabric indigo dyeing method, comprising the following steps: adding indigo to water, then adding Tween 80 and absolute ethanol to obtain a dispersion liquid; filtering the dispersion liquid and ultrasonically dispersing again to obtain an indigo suspension; Add sodium lauryl sulfate, citric acid, hydrosulfite, and alkali to the indigo suspension under an oxygen environment to obtain a foaming liquid, stir to make it foam, apply the foam to the fabric, dye, and oxidize to fix the color. The fabric indigo dyeing method of the present invention uses Tween 80 and absolute ethanol to disperse the indigo, and then prepares the nano-blue suspension through an ultrasonic dispersion process, and uses hydrosulfite to reduce the indigo suspension under alkaline conditions in combination with an oxygen-free environment Form leuco indigo, combine with foam system, stir and foam, and carry out foam dyeing. The performance of foam dyeing is better in all aspects after the combination of ultrasonic pulverization and anaerobic environment. The dyed fabric is sweat-resistant, water-resistant, wear-resistant and breathable. Sex and K / S value apparent color depth are good.

Description

technical field [0001] The invention relates to the technical field of textile dyeing and finishing, in particular to a fabric indigo dyeing method. Background technique [0002] Indigo is an indispensable vat dye in the denim textile industry. In the factory, it is mainly vat dyed through the traditional indigo reduction method. A large amount of sodium hydroxide is dissolved in an aqueous solution to form an alkaline environment, and then an appropriate amount of sodium hydrosulfite is added to stir and dissolve. Finally, indigo is added, and it is reduced to leuco indigo at a certain temperature to dye the fabric. This dyeing process not only consumes a large amount of chemicals, but also causes serious washing water pollution, water consumption and energy consumption. The subsequent wastewater discharge treatment is also at this stage. world problems. At the same time, due to the poor planarity of indigo water-soluble leuco molecules and low affinity to fabrics, resulti...

AI Technical Summary

Problems solved by technology

[0002] Indigo is an indispensable vat dye in the denim textile industry. In the factory, it is mainly vat dyed through the traditional indigo reduction method. A large amount of sodium hydroxide is dissolved in an aqueous solution to form an alkaline environment, and then an appropriate amount of sodium hydrosulfite is added to stir and dissolve. Finally, indigo is added, and it is reduced to leuco indigo at a certain temperature to dye the fabric. This dyeing process not only consumes a large amount of chemicals, but also causes serious washing water pollution, water consumption and energy consumption. The subsequent wastewater discharge treatment is also at this stage. world problems

At the same time, due to the poor planarity of indigo water-soluble leuco molecules and low affinity to fabrics, resulting in low dyeing rate and dye uptake rate, poor penetrating ability, and difficult to dye dark colors, the current industry is based on indigo dyeing of cotton fibers. During the process, because the leuco indigo is easily oxidized, after the first dyeing, the oxidized leuco indigo is oxidized into indigo particles and adheres to the surface of the fiber, blocking the gaps in the fiber. The dyeing can not achieve the effect of deep color penetration of the fiber

Images