Method for dyeing linen fabric/fibres by reduced dye at high temperature

A hemp fabric and dye technology, applied in dyeing, textile and paper making, etc., can solve the problems of self-decomposition or other side reactions, over-reduction, poor dyeing effect, etc.

Inactive Publication Date: 2013-06-19
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high-temperature alkaline conditions, vat dyes are prone to over-reduction, self-decomposition or other side reactions, resulting in poor dyeing effect

Method used

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  • Method for dyeing linen fabric/fibres by reduced dye at high temperature
  • Method for dyeing linen fabric/fibres by reduced dye at high temperature
  • Method for dyeing linen fabric/fibres by reduced dye at high temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: the high-temperature dyeing process of vat yellow G:

[0018] Add 6g / L hydrosulfite and 2g / L NaOH to 0.1g / L vat yellow G dispersion, fully reduce at 50°C, then raise the temperature to 130°C at a rate of 5°C / min, and keep it warm After 10 min, cool down to room temperature. The absorption curves of leucosome solution of reduced yellow G before and after high temperature treatment are as follows: figure 1 shown. It can be seen that the absorption curve of vat yellow G is basically unchanged before and after high temperature treatment, so vat yellow G is suitable for high temperature dyeing.

[0019] The dyeing of vat yellow G to hemp fabric: according to the bath ratio of 1:40, the dye that will be 5% by weight to the fabric, the sodium hydroxide of 40g / L, the sodium hydroxide of 20g / L, prepare vat yellow G in the dyeing vat suspension. After sealing, heat up to 70°C and reduce for 10 minutes. Then add the hemp fabric, reseal it, heat it up to 110°C at...

Embodiment 2

[0020] Embodiment 2: the high-temperature dyeing process of reduced bright red GG:

[0021] Raise the temperature of the reduced scarlet GG solution, which has been fully reduced by sodium sulfide in the presence of NaOH, to 130°C at a rate of 5°C / min, keep it warm for 10 minutes, and then cool down to room temperature. The absorption curves of the reduced scarlet GG leucosome solution before and after high temperature treatment are as follows: figure 2 shown. It can be seen that the absorption curve of reduced scarlet GG is basically unchanged before and after high temperature treatment, so reduced scarlet GG is suitable for high temperature dyeing.

[0022] Dyeing of hemp fabric with vat scarlet GG: according to the bath ratio of 1:40, the dye that is 5% of the fabric weight, 40g / L of hydrosulfite, and sodium hydroxide of 20g / L are prepared in the dyeing vat to prepare vat scarlet GG suspension. After sealing, heat up to 70°C and reduce for 15 minutes. Then add the hemp...

Embodiment 3

[0023] Example 3: Dyeing Cannabis with Reduced Olive Green B

[0024] Raise the temperature of the reduced olive green B solution that has been fully reduced by sodium sulfide in the presence of NaOH to 130°C at a rate of 5°C / min, keep it warm for 10 minutes, and then cool down to room temperature. The absorption curves of the reduced olive green B leucosome solution before and after high temperature treatment are as follows: image 3 shown. It can be seen that the absorption curve of reduced olive green B is basically unchanged before and after high temperature treatment, so reduced olive green B is suitable for high temperature dyeing.

[0025] The dyeing of reduced olive green B to hemp fabric: according to the bath ratio of 1: 40, will be the dyestuff that is 5% by weight to fabric, the sodium hydroxide of 30g / L, the sodium hydroxide of 25g / L, prepare reduced olive green B in the dyeing vat suspension. After sealing, heat up to 70°C and reduce for 15 minutes. Then add ...

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Abstract

The invention relates to a method for dyeing linen fabric/fibres by a reduced dye at a high temperature. The method comprises the following steps of: (1) dye selection, namely, in the existence of reduced dyes, a reducer, NaOH and a dye high-temperature stabilizer, completely reducing the dyes into leuco bodies, and then determining the absorption curve of the completely-reduced-state dye solution before and after the treatments via temperature-rising, high-temperature and constant-temperature treatments, so as to find the reduced dye suitable for high-temperature drying; and (2) a dyeing process, namely, preparing the suspension of the reduced dye in a dye vat according to proper dyeing conditions including a bath ratio, a dye amount, the reducer, sodium hydroxide, and the high-temperature stabilizer, adequately reducing and then adding the linen fabric, heating, raising temperature and dying at 100-160 DEG C, then washing by cold water, developing via the complete oxidation of H2O2, performing soap-boiling in liquid soap, washing by hot water, drying and the like. The linen fabric dyed via the high-temperature dyeing process aforementioned is bright in colour, high in colour yield, and especially great in dye permeability.

Description

technical field [0001] The invention relates to a method for dyeing fabrics, in particular to a method for high-temperature dyeing of hemp fibers and their blended fabrics with vat dyes. technical background [0002] Linen fabric is favored by consumers for its rough style and unique wearing properties such as good moisture absorption and heat dissipation. In particular, hemp fiber has the functions of good moisture absorption and dehumidification, non-sticky, no itching, antibacterial, anti-mildew, anti-ultraviolet, anti-radiation and anti-static functions, so it is very popular. However, the content of cellulose in hemp fiber is low, while the content of natural co-organisms such as lignin, hemicellulose and pectin is high; and the degree of polymerization, crystallinity and orientation of hemp cellulose are higher than that of cotton fiber, because of its The above-mentioned characteristics cause dyeing difficulties, especially difficult to dye dark colors, and the dyein...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P3/60D06P3/85D06P1/22
Inventor 李宏伟邵增进郝新敏王建明
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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