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Novel indigo blue reducing and dyeing method

A dyeing method, the technology of indigo, applied in the field of textile printing and dyeing, can solve the problems of recycling and high cost, achieve soft color, easy control, and prevent uneven dyeing

Inactive Publication Date: 2018-10-12
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its cost is relatively high, it needs to be recycled, and it has certain risks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Ascorbic acid reduction indigo process: indigo 0.5% (omf), add water at a dry bath ratio of 1:50 (dye mass: water mass), stir well at room temperature until uniform, add 1g / L ascorbic acid, 5g / L hydrogen The sodium oxide was fully stirred evenly, and reduced at 50°C for 30 minutes. A yellow-green leuco indigo solution is obtained.

[0019] Leuco dyeing process after reduction: Dilute the leuco solution to a liquor ratio of 1:20 (fabric quality: solution quality), and put it into cotton fabric for dyeing. Dipping at 25°C for 10 minutes. Take out the cloth sample, oxidize in the air for 10 minutes, soap wash, wash with water, and dry.

[0020] The soaping process conditions are: bath ratio 1:50, standard soap flakes 2g / L, anhydrous sodium carbonate 2g / L, soaping in 80°C water bath for 20min, cold water washing, and drying.

[0021] The K / S value of the obtained indigo-dyed cotton fabric is 0.3469, and the color index L*45.72, C*15.44, h 255.32. The color fastness to d...

Embodiment 2

[0023] Ascorbic acid reduction indigo process: Indigo 0.5% (omf), add water at a dry bath ratio of 1:50 (dye mass: water mass), stir well at room temperature until uniform, add 2g / L ascorbic acid, 2g / L hydrogen The sodium oxide is fully stirred evenly, and reduced at 80°C for 10 minutes, then 4g / L ascorbic acid and 4g / L sodium hydroxide are added, fully stirred evenly, and the reduction is continued for 40 minutes. A yellow-green leuco indigo solution is obtained.

[0024] Leuco dyeing process after reduction: Dilute the leuco solution to a bath ratio of 1:30 (fabric mass:solution mass), put it into silk fabric for dyeing. Dipping at 25°C for 10 minutes. Take out the cloth sample, oxidize in the air for 10 minutes, soap wash, wash with water, and dry. Continue dyeing once (continued dyeing time is 10min, oxidation 10min).

[0025] The soaping process conditions are: bath ratio 1:50, standard soap flakes 2g / L, anhydrous sodium carbonate 2g / L, soaping in 80°C water bath for 2...

Embodiment 3

[0028] Ascorbic acid reduction indigo process: Indigo 5% (omf), add water at a dry bath ratio of 1:50 (dye quality: water quality), stir well at room temperature until uniform, add 25g / L ascorbic acid, 30g / L hydrogen The sodium oxide was fully stirred evenly, and reduced at 90°C for 60 minutes.

[0029] Leuco dyeing process after reduction: Dilute the leuco solution to a bath ratio of 1:20-50 (fabric quality:solution quality), put it into wool fabric for dyeing. Dipping at 40°C for 30 minutes. Take out the cloth sample, oxidize in the air for 30 minutes, soap wash, wash with water, and dry. Continue dyeing for 2 times (15 minutes for each continuous dyeing, 30 minutes for oxidation).

[0030] The soaping process conditions are: liquor ratio 1:50, standard soap flakes 2g / L, anhydrous sodium carbonate 2g / L, soaping at 80°C for 20min, cold water washing, and drying.

[0031] The K / S value of the obtained indigo dyed wool fabric is 1.3682, the color index L*60.09, C*18.57, h 25...

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PUM

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Abstract

The invention belongs to the technical field of textile printing and dyeing, and especially relates to an indigo blue reducing and dyeing method. The clean indigo blue reducing and dyeing method is provided to avoid the problems of poor labor environment and excessive amount of sulfate substances in wastewater in the traditional indigo blue reducing and dyeing process. The method provided by the invention has the advantages of no irritating odor in the reducing and dyeing process, mild reaction process, easiness in control, and no sulfur-containing substances in the wastewater. An indigo bluedyed fabric obtained by dyeing using the method has a soft color and a good color fastness.

Description

technical field [0001] The invention belongs to the technical field of textile printing and dyeing, in particular to a vat dyeing method of indigo. Background technique [0002] Indigo is a dark blue dye in powder form, and its English name is Indigo blue or Vat Blue 1. Natural indigo is the earliest vat dye used by humans. It belongs to the indigo family and is mainly extracted from bluegrass. In 1897, synthetic indigo was successfully produced by BASF. In industrial production, hydrosulfite (Na 2 S 2 o 4 ) is the main reducing agent used to reduce indigo dye. Sodium dithionite poses a problem of polluting the environment due to the formation of environmentally relevant products (such as sulfite, sulfate, sulfur, etc.) in wastewater. Research on environmentally friendly indigo reducing agents and other reduction methods and technologies has also become a hot spot. [0003] Thiourea dioxide (formamidine sulfinic acid, referred to as TD) is a commonly used substitute. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P1/22D06P1/651D06P1/96
CPCD06P1/228D06P1/65125D06P1/96
Inventor 汪媛陈群彭勇刚纪俊玲
Owner CHANGZHOU UNIV
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