A process for improving the color fastness of rayon without sodium sulfate reactive dyes

A reactive dye and sodium sulfate technology, applied in the field of rayon dyeing, can solve the problems of low fastness, low efficiency, mass production of rayon, and affecting efficiency, and achieve the effect of reducing unevenness

Active Publication Date: 2022-02-18
杭州众智纺织科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of this type of process mode in the dyeing process of rayon takes a long time. The invention patent of "a method of dyeing viscose fiber package yarn with low liquor ratio" has to be carried out at 80-95 °C, 30min level dyeing treatment, the efficiency is very low and the quality is unstable, which has a great impact on the application of rayon in fabric production and mass production, and also seriously restricts the production of high-end viscose, rayon fiber, real silk, mercerized cotton, spun silk, A breakthrough in the dyeing quality of silk and modal with high adsorption dyeing rate after chemical treatment. The process takes 8-12 hours, which seriously affects the efficiency, especially in the quality and fabric promotion of high-density forming processes such as cheese and warp beam dyeing. technical barriers
[0006] Tie dyeing of rayon dark fabrics generally uses reactive dyes, which have the characteristics of better depth and low cost, but the fastness to soaping, rubbing, sunlight, ironing, chlorine bleaching, etc. is significantly lower than that of Shihlin dyes

Method used

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  • A process for improving the color fastness of rayon without sodium sulfate reactive dyes
  • A process for improving the color fastness of rayon without sodium sulfate reactive dyes
  • A process for improving the color fastness of rayon without sodium sulfate reactive dyes

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Effect test

Embodiment 1

[0043] A kind of technique that improves rayon without sodium sulfate reactive dyestuff color fastness, comprises the following steps:

[0044] Step 1. Degreasing by dispersion and penetration: add anionic dispersant 2.0g / L, diffusing agent NNO 1.0g / L and acetic acid 1g / L, keep warm at 90°C for 15min, and the pH value is 4;

[0045] Step 2. Dyeing: After degreasing, cool down to 60°C for dyeing or directly drain and then add water for dyeing. Dyeing specific operation: add anionic dispersant 0.5g / L, diffusing agent NNO2.0g / L, dye OWF dosage 0.5%, Add sodium carbonate 25g / L twice, add 20% of the total amount for the first time, feed at 80°C for 5 minutes, and keep warm for 20 minutes; add 80% of the total amount for the second time, and use the quantitative timing DOSING system to feed for 20 minutes , keep warm at 60°C according to the color depth for 60 minutes; during the dyeing process, the pressure difference between the inside and outside of the package is controlled at 3...

Embodiment 2

[0048] A kind of technique that improves rayon without sodium sulfate reactive dyestuff color fastness, comprises the following steps:

[0049] Step 1. Degreasing by dispersing and penetrating: add anionic dispersant 0.5g / L, diffusing agent NNO 3.0g / L and acetic acid 2.0g / L, keep warm at 80°C for 30min, and control the pH value at 5.5;

[0050] Step 2. Dyeing: After degreasing, cool down to 40°C for dyeing or directly drain and then add water for dyeing. Specific dyeing operations: Add anionic dispersant 2.0g / L, diffusing agent NNO 1.0g / L, dye OWF dosage 3%, Add sodium carbonate 5g / L twice, add 10% of the total amount for the first time, feed at 50°C for 10 minutes, and keep warm for 15 minutes; add 90% of the total amount for the second time, and use the quantitative timing DOSING system to feed for 60 minutes , keep warm at 90°C according to the color depth, for 20 minutes; during the dyeing process, the pressure difference between the inside and outside of the cheese is con...

Embodiment 3

[0053] A kind of technique that improves rayon without sodium sulfate reactive dyestuff color fastness, comprises the following steps:

[0054] Step 1. Degreasing by dispersing and penetrating: add anionic dispersant 1.8g / L, diffusing agent NNO2.0g / L and acetic acid 1.5g / L, keep warm at 100°C for 10min, and control the pH value at 4.5;

[0055] Step 2. Dyeing: After degreasing, cool down to 50°C for dyeing or directly drain water and then add water for dyeing. Specific dyeing operations: add anionic dispersant 0.8g / L, diffusing agent NNO3.0g / L, dye OWF dosage 7%, Add 30 g / L of sodium carbonate twice, add 16% of the total amount for the first time, feed at 75°C for 7 minutes, and keep warm for 5 minutes; add 84% of the total amount for the second time, and use the quantitative and timing DOSING system to feed 35min, heat preservation at 80°C according to the color depth, and the time is 50min; during the dyeing process, the pressure difference between the inside and outside of ...

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Abstract

The invention discloses a process for improving the color fastness of rayon without sodium sulfate reactive dyes, in particular to solve the problem of color fastness of various dyes, and to improve the color fastness on the basis of the salt-free and high-alkali process , what adopt is the density that density is 0.35-0.6 g / cm³, the package yarn of single yarn weight 800-1200g, comprises three steps of dispersing and penetrating degreasing, dyeing, post-treatment, the present invention utilizes equivalent alkali amount or improves 20-40 % of alkali to improve color fastness and color depth, use the principle of weak alkali to ensure the reduction of floating color, and effectively implement the process of improving color fastness; effectively solve the technical problem that rayon cheese yarn is easy to color and cannot be mass-produced, and there is no Due to the limitation of bath ratio requirements, it can realize the process requirements of ultra-low bath ratio of 1:3, and also meet the production requirements of large bath ratio. It can also use the one-way function or two-way function of the equipment to dye. It is an energy-saving and environmental protection technology for dyeing and finishing. major breakthrough.

Description

technical field [0001] The invention belongs to the field of rayon dyeing, and in particular relates to a process for improving the color fastness of rayon with sodium sulfate-free reactive dyes. Background technique [0002] Bath ratio is a term used in textile dyeing and finishing, which refers to the ratio of exhaust dyed fabric to dye liquor. Liquor ratio is one of the three elements of the dyeing process. The size of the liquor ratio affects the amount of water used and the amount of dyes and auxiliaries. With the increase of the liquor ratio, the consumption of water, steam, electricity, dyes, and auxiliaries per ton of yarn It also increases accordingly. How to reasonably control the bath ratio and reduce the bath ratio is one of the main ways to save energy and reduce emissions. [0003] The color fastness of dyed and finished fibers and fabrics is a term used in textile dyeing and finishing, which refers to the color fastness to staining, washing fastness, soaping ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P1/38D06P1/44D06P1/00D06P5/04D06P5/10
CPCD06P1/38D06P5/04D06P5/10D06P1/445D06P1/0032
Inventor 罗湘春罗业罗凯峰
Owner 杭州众智纺织科技有限责任公司
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