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A kind of method utilizing natural indigo to dye denim yarn

A natural indigo and yarn technology, applied in dyeing, textiles and papermaking, can solve the problems of low affinity of leuco indigo to cotton fiber, poor color brightness and slow reduction, so as to improve the utilization rate and The effect of reduction ability, deep color and high reduction rate

Active Publication Date: 2020-07-31
鹤壁新歌源丹宁科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the fermentation method is the earliest application, and its advantage is that the equipment is simple and the production cost is low; the disadvantage is that it requires a lot of cumbersome manual operations, and the reduction is slow. It usually takes 7 to 10 days to form leucosomes, the production efficiency is low, and continuous production is not possible.
The thiourea dioxide method has poor stability and is prone to excessive reduction, resulting in a decrease in dyeing rate
[0003] Leuco indigo has low affinity to cotton fiber, and the dyeing rate is low. The method of increasing the concentration of dyeing solution and dyeing temperature to promote dyeing of leuco will result in poor color brightness, poor dyeing reproducibility, and poor color fastness. And other issues

Method used

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  • A kind of method utilizing natural indigo to dye denim yarn
  • A kind of method utilizing natural indigo to dye denim yarn
  • A kind of method utilizing natural indigo to dye denim yarn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The method of utilizing natural indigo dyed denim yarn of the present embodiment, the steps are as follows:

[0027] (1) Dye pre-reduction: Put the natural indigo into a beaker, add a small amount of alcohol and water and mix thoroughly, then add water and stir to reach 1 / 3 of the total liquid volume. At this time, the concentration of natural indigo is 1.5g / L (equivalent to The concentration in the leuco dye solution is 0.5g / L), adding sodium hydroxide 3g / L (equivalent to the concentration in the leuco dye solution is 1 g / L), hydrosulfite 1.5 g / L (equivalent to The concentration in the leuco dye solution is 0.5 g / L), the hydrosulfite stabilizer is 0.75 g / L (equivalent to the concentration in the leuco dye solution is 0.25 g / L), and it is used at 40°C The dye is fully reduced to obtain a leuco-body mother liquor; wherein the hydrosulfate stabilizer is made of the following components by weight: 40% glucose, 30% sodium hypophosphite, and the balance is anthraquinone;

...

Embodiment 2

[0035] The method of utilizing natural indigo dyed denim yarn of the present embodiment, the steps are as follows:

[0036] (1) Dye pre-reduction: put natural indigo into a beaker, add a small amount of alcohol and water and mix thoroughly, then add water and stir to reach 1 / 3 of the total liquid volume. At this time, the concentration of natural indigo is 6g / L (equivalent to The concentration in the leuco dye solution is 2 g / L), adding sodium hydroxide 9g / L (equivalent to 3 g / L in the leuco dye solution), and 3.6 g / L hydrosulfite (equivalent to The concentration in the leuco dye solution is 1.2 g / L), the hydrosulfite stabilizer is 1.8 g / L (equivalent to the concentration in the leuco dye solution is 0.6 g / L), and the dye is made at 50°C Sufficient reduction to obtain leucosome mother liquor; wherein the hydrosulfate stabilizer is made of the following components by weight: 50% glucose, 40% sodium hypophosphite, and the balance is anthraquinone;

[0037] (2) Preparation of dy...

Embodiment 3

[0044] The method of utilizing natural indigo dyed denim yarn of the present embodiment, the steps are as follows:

[0045] (1) Dye pre-reduction: put natural indigo into a beaker, add a small amount of alcohol and water and mix thoroughly, then add water and stir to reach 1 / 3 of the total liquid volume. At this time, the concentration of natural indigo is 3.9g / L (equivalent to The concentration in the leuco dye solution is 1.3g / L), adding sodium hydroxide 6g / L (equivalent to the concentration in the leuco dye solution is 2g / L), sodium hydrochloride 2.4 g / L (equivalent to The concentration in the leuco dye solution is 0.8 g / L), the hydrosulfite stabilizer is 1.2 g / L (equivalent to the concentration in the leuco dye solution is 0.4 g / L), and the dye is made at 45°C Sufficient reduction to obtain leucosome mother liquor; wherein the hydrosulfate stabilizer is made of the following components by weight ratio: 40% glucose, 40% sodium hypophosphite, and the balance is anthraquinone...

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Abstract

The invention discloses a method for dyeing denim yarn with natural indigo blue. The method comprises the following steps: dyeing denim cotton yarns by using a leuco body multi-time padding oxidationmethod, carrying out vatting reduction at 40-50 DEG C, and dyeing denim yarns according to processes of pre-dyeing treatment, dyeing, oxidation, dyeing, oxidation, dyeing, oxidation, dyeing, oxidation, dyeing, oxidation, dyeing, oxidation and aftertreatmenet with 0.5-2g / L of natural indigo blue, 1.5-4.5g / L of sodium hydroxide, 0.75-1.8g / L of sodium hydrosulfite, 0.25-0.6g / L of a sodium hydrosulfite stabilizer, 10-15g / L of a dyeing acceleration agent sodium chloride or sodium sulfate and 2g / L of a penetrant JFC2. By adopting the dyeing method of multiple times of padding, rolling and oxidation,the dyeing fastness of the denim yarns can be improved, dyeing and oxidation can be both carried out under a room temperature condition, no heating is needed, energy conservation and environment protection can be achieved, reduction is carried out by using a sodium hydrosulfite method, a high reduction velocity can be achieved, and a stable dyeing effect can be achieved.

Description

technical field [0001] The invention belongs to the technical field of fabric dyeing, in particular to a method for dyeing denim yarn with natural indigo. Background technique [0002] Natural pigments are born in nature and end in nature. They have good compatibility with the environment, are biodegradable, do not produce toxic substances, do not irritate the skin, and are not carcinogenic. Natural indigo is made by fermenting the leaves of plants containing indole acid, such as Polygonum indigo, Isatis indigo, Indigo indigo, and Horse indigo. It is a vat dye, insoluble in water, and has no affinity for fibers. When dyeing, indigo needs to be reduced to leuco so that it can be dissolved in water, has affinity for fibers, and can dye fibers. The reduction methods of indigo include fermentation method, sodium bicarbonate method, thiourea dioxide method, etc. Among them, the fermentation method is the earliest application, and its advantage is that the equipment is simple an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P1/22D06P3/60D06P1/651D06P1/673D06P1/44
CPCD06P1/228D06P1/445D06P1/65112D06P1/65118D06P1/6735D06P1/67358D06P3/6025
Inventor 宋慧君梅洪稳李新阳钞意元王良帅王尚苏国鑫曹建峰
Owner 鹤壁新歌源丹宁科技有限公司
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