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One-time deep dyeing method for cotton fiber employing indigo dye

A technology of indigo dye and cotton fiber, which is applied in the field of dyeing cotton fiber with indigo dye, which can solve the problems of difficulty in dyeing dark colors at one time, low production efficiency, and complicated dyeing process, so as to improve indigo dyeing rate and reduce processing Cost, effect of improving dyeing efficiency

Active Publication Date: 2016-03-16
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for one-time dyeing of cotton fiber with indigo dye in a dark color. Aiming at the low dyeing rate of indigo dye, complicated dyeing process, low production efficiency, and difficulty in one-time dyeing of dark color, the present invention chooses Shijia Cyclopentasiloxane (D5) replaces water as the indigo dyeing medium, which can achieve the effect of indigo dyeing on cotton fiber in one time, simplifies the dyeing process, shortens the dyeing time, improves work efficiency, saves costs, and significantly reduces the discharge of dyeing wastewater

Method used

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  • One-time deep dyeing method for cotton fiber employing indigo dye
  • One-time deep dyeing method for cotton fiber employing indigo dye
  • One-time deep dyeing method for cotton fiber employing indigo dye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of indigo dye of cotton fiber once dyes dark color method, comprises the steps:

[0025] (1) Pretreatment of cotton fiber: Weigh 1g of cotton fiber, put it into a caustic soda solution with a concentration of 30g / L, the bath ratio is 1:50, and scour the cotton fiber for 60min at a temperature of 80°C. Then washing and dehydration, control the liquid-carrying rate of cotton fiber to 120%, prepare for dyeing;

[0026] (2) Preparation of high-concentration leuco indigo solution:

[0027] Table 1 prepares the formula of high concentration (10g / L) leucoindigo solution

[0028]

[0029] Accurately weigh each drug according to the formula in Table 1. Add 1.5g of caustic soda and 4g of sodium hydrosulfite into 50ml of water, stir to dissolve to obtain a reducing solution, then add 0.5g of indigo dye to the prepared reducing solution, and perform reduction in a constant temperature water bath. The reduction conditions are: reduce at 50°C for 30 minutes to prepare a ...

Embodiment 2

[0037] The difference from Example 1 is that the preparation conditions of high-concentration leuco indigo and the dyeing conditions of cotton fibers are different. Other conditions are the same as in Example 1.

[0038] The preparation formula and reduction conditions of high-concentration leuco indigo are shown in Table 3.

[0039] Table 3 prepares the formula of high concentration (20g / L) leucoindigo solution

[0040]

[0041] The reduction condition is: reduce at 60°C for 20 minutes to prepare a high-concentration (20g / L) leuco indigo solution.

[0042] The dyeing conditions of cotton fiber are as follows: dyeing at room temperature first, heating up to 80°C within 15 minutes, and keeping warm at 80°C for 20 minutes.

Embodiment 3

[0044] The difference from Example 1 is that the preparation conditions of high-concentration leuco indigo and the dyeing conditions of cotton fibers are different. Other conditions are the same as in Example 1.

[0045] The preparation formula and reduction conditions of high-concentration leuco indigo are shown in Table 4.

[0046] Table 4 prepares the formula of high concentration (40g / L) indigo leucosome solution

[0047]

[0048] The reduction condition is: reduce at 55°C for 40 minutes to prepare a high-concentration (40g / L) leuco indigo solution.

[0049] The dyeing conditions of cotton fiber are as follows: dyeing at room temperature first, heating up to 60°C within 10 minutes, and keeping warm at 60°C for 60 minutes.

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Abstract

The invention discloses a one-time deep dyeing method for a cotton fiber employing an indigo dye. The method is a process of finishing dyeing of the cotton fiber with the indigo dye in a non-aqueous medium of decamethyl cyclopentasiloxane (D5). The method comprises the following steps: (1) refining, washing and dewatering the cotton fiber, and controlling the final take-up rate for dyeing; (2) preparing a high-concentration indigo leuco body; (3) firstly, adding a proper amount of high-concentration indigo leuco body to the D5 to prepare a dye liquor, and then putting the cotton fiber with certain take-up rate into a non-aqueous dye liquor for dyeing; and 4) after dyeing, carrying out oxidation treatment, and then carrying out soap boiling to remove the surface floating color. The cotton fiber is dyed in the D5 by the indigo dye; oxidation of the indigo leuco body in the dyeing process and invalid decomposition of sodium hydrosulfite can be effectively suppressed; the one-time deep dyeing effect is reached; the dyeing procedure is greatly simplified; the dyeing time is shortened; the work efficiency is improved; the cost is saved; and dyeing wastewater emission is significantly reduced.

Description

technical field [0001] The invention relates to a method for one-time dyeing of cotton fiber with indigo dye in deep color, in particular, decamethylcyclopentasiloxane (D5) is selected as the non-aqueous medium to complete the dyeing of cotton fiber with indigo dye. Background technique [0002] Denim clothing has always occupied a special position in the fashion field. It is deeply loved by consumers of all ages for its breathable, moisture-absorbing, and comfortable styles. As the most important dye for denim dyeing—indigo, it has unique dyeing properties and dyeing styles. [0003] The process of indigo dyeing usually includes: indigo reduction, leuco dyeing, leuco oxidation and post-soaping treatment. Indigo traditional water-bath dyeing mainly has two defects. On the one hand, from the nature of indigo dye itself, due to the low affinity of indigo leuco to cotton fiber, dyeing is difficult, and the dyeing rate is low, only about 10%. High dyeing depth usually needs to...

Claims

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Application Information

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IPC IPC(8): D06P1/22D06P1/92D06P3/60
CPCD06P1/228D06P1/928D06P3/003D06P3/6025
Inventor 邵建中李栋刘今强
Owner ZHEJIANG SCI-TECH UNIV
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