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Environment-friendly method for improving paper dye fastness

An environment-friendly, color fastness technology, applied in the environment-friendly field, can solve the problems of low color fastness of colored paper, limited development, high color value of dyeing waste liquid, and achieve good dry/wet rubbing color fastness, The effect of improving the competitiveness of the industry and improving the dyeing efficiency

Active Publication Date: 2017-09-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of fiber required for colored paper, modifying the fiber before dyeing not only consumes a lot of space and cost, but also causes environmental pollution downstream, making it difficult to scale production
Although the addition of color-fixing agent during the dyeing process can improve the binding strength between the fiber and the dye, the dyed paper still has the problem of rubbing or water-fading during use.
In addition, the dyeing rate of the current dyeing process is low, and the chroma value of the dyeing waste liquid is high, causing serious pollution to the water environment
The low color fastness and poor dyeing rate of colored paper limit its development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Refining 60g of coniferous wood pulp, the pulp concentration after treatment is 10 wt%;

[0040] (2) Enzymolyze the slurry treated in step (1), first dissolve the cellulose compound enzyme (enzyme activity: 180 PFU / g) in deionized water to obtain the enzymatic hydrolysis solution; then use the enzymatic hydrolysis solution to adjust the slurry The feed concentration is 5 wt%, the enzyme dosage is 50g / kg (relative to the absolute dry pulp), and the enzymolysis is carried out at pH 5.5 and temperature 50°C for 3 hours;

[0041] (3) Add the slurry after enzymatic hydrolysis in step (2) into Direct Scarlet 4B, where the dosage of Direct Scarlet 4B is 100g / kg (relative to the dry pulp), and stir at 50°C and 3000r / min 48h for staining;

[0042] (4) Mechanically grind the dyed slurry in step (3), add deionized water to adjust the slurry concentration to 1‰ during mechanical grinding, and grind 4 times under a pressure of 40MPa;

[0043] (5) Filter the slurry obtained in ...

Embodiment 2

[0048] (1) 60g of coniferous wood pulp is subjected to refining treatment, and the pulp concentration after treatment is 15wt%;

[0049] (2) Enzymolyze the slurry treated in step (1), first dissolve the cellulose compound enzyme (enzyme activity: 180 PFU / g) in deionized water to obtain the enzymatic hydrolysis solution; then use the enzymatic hydrolysis solution to adjust the slurry The feed concentration is 2wt%, the enzyme dosage is 50g / kg (relative to the absolute dry pulp), and the pH is 5.5, and the temperature is 40°C for 36 hours;

[0050] (3) Add the slurry after enzymatic hydrolysis in step (2) into Direct Red 4B, where the dosage of Direct Red 4B is 100g / kg (relative to the dry pulp), and stir at 60°C and 500r / min 72h for staining;

[0051] (4) Mechanically grind the dyed slurry in step (3), add deionized water to adjust the slurry concentration to 1‰ during mechanical grinding, and grind 4 times under a pressure of 60MPa;

[0052] (5) Filter the slurry obtained in...

Embodiment 3

[0057] (1) 60g of coniferous wood pulp is subjected to refining treatment, and the pulp concentration after treatment is 25wt%;

[0058] (2) Enzymolyze the slurry treated in step (1), first dissolve the cellulose compound enzyme (enzyme activity: 180 PFU / g) in deionized water to obtain the enzymatic hydrolysis solution; then use the enzymatic hydrolysis solution to adjust the slurry The feed concentration is 10wt%, the enzyme dosage is 50g / kg (relative to the absolute dry pulp), and the pH is 4.8, and the temperature is 60°C for 15 hours;

[0059] (3) Add the slurry after enzymatic hydrolysis in step (2) into Direct Red 4B, where the dosage of Direct Red 4B is 100g / kg (relative to the dry pulp), and stir at 70°C and 8000r / min 24h for dyeing;

[0060] (4) Mechanically grind the dyed slurry in step (3), add deionized water to adjust the slurry concentration to 1‰ during mechanical grinding, and grind 4 times under a pressure of 40MPa;

[0061] (5) Filter the slurry obtained in...

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Abstract

The invention discloses an environment-friendly method for improving paper dye fastness. The method comprises the following concrete process steps of pretreating lignocellulose slurry through a mechanical method, and carrying out enzymolysis treatment, dyeing, and nanocrystallization grinding treatment on the pretreated material so as to obtain a nanocellulose-based dye. According to the environment-friendly method for improving the paper dye fastness provided by the invention, the dye is immobilized through nano fiber, so that the obtained nanocellulose-based dye can be uniformly dispersed in water but cannot lose color in water, and the pollution of the dye on water during a dyeing process can be effectively eliminated. In addition, after paper is dyed through the nanocellulose-based dye prepared by using the method provided by the invention, the dry friction fastness of the paper is remarkably improved, and the dyed paper cannot lose color after being soaked in water. The dyeing process is simple, environment-friendly and high-efficient, can be beneficial for effectively improving the industrial competitiveness of colored paper, and has favorable social benefit and economic benefit.

Description

technical field [0001] The invention belongs to the technical field of textile printing and dyeing, and in particular relates to an environment-friendly method for improving the color fastness of paper dyeing. Background technique [0002] With the improvement of people's living standards, various colored papers and their products have appeared one after another. While enriching people's lives, colored paper also enhances the market competitiveness of its products. However, the color of colored paper has poor resistance to various external forces (dry friction, wet friction) during processing, storage and application. Therefore, improving the dry / wet rubbing color fastness of colored paper has attracted more and more attention. [0003] Paper dyeing methods are mainly divided into pulp dyeing and paper coating, in which the color fastness of pulp dyeing is relatively high. At present, there are two main ways to improve the color fastness of paper: one is to treat the pulp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/28D21H23/04D21D1/20D21C5/00
CPCD21C5/005D21D1/20D21H21/28D21H23/04
Inventor 高文花王胜丹陈克复曾劲松徐峻王斌
Owner SOUTH CHINA UNIV OF TECH
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