A method for improving the dyeing depth of cellulose fiber fabrics with chitosan

A technology for dyeing cellulose fibers and fabrics, applied in dyeing methods, fiber treatment, plant fibers, etc., can solve problems such as fiber strength damage, chitosan shedding, and poor bonding, and achieve improved reactivity, wrinkle resistance, and The effect of improving the dyeing rate

Active Publication Date: 2011-12-07
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods mainly use the physical adsorption between chitosan and cellulose fiber to make chitosan adhere to the surface of cellulose fiber fabric. Falling off, affecting the final effect
Peng Yonggang [Peng Yonggang, Ji Junling, Tao Yongxin, et al. Research on dyeing properties of chitosan grafted oxidized cotton fabrics [J] Printing and Dyeing, 2011 (8): 12-14, 32.] Selective oxidation of cellulose fibers to obtain 2 , 3-dialdehyde-based cellulose, and then use the Schiff base reaction between -NH2 and aldehyde groups on chitosan to covalently bind chitosan to cellulose fibers, which significantly improves the relationship between chitosan and cellulose The bonding fastness between fibers, but in the oxidation process of cellulose fibers, it is easy to cause damage to the fiber strength

Method used

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  • A method for improving the dyeing depth of cellulose fiber fabrics with chitosan
  • A method for improving the dyeing depth of cellulose fiber fabrics with chitosan
  • A method for improving the dyeing depth of cellulose fiber fabrics with chitosan

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Alkali pretreatment: immerse 2g of desized, scoured, and bleached cotton fabric in 20% NaOH solution at room temperature, soak for 20 minutes, wash 3 times with water, then soak in 10% glacial acetic acid for 30 minutes, and wash until Neutral, dry at 80°C to obtain alkali pretreated cotton fabric;

[0027] 0.025g chitosan was dissolved in 100mL of citric acid solution with a mass fraction of 5%. After it was completely dissolved, 0.001moL epichlorohydrin was added to obtain a chitosan finishing solution;

[0028] Pad the chitosan finishing solution through alkali pretreated cotton fabric, two dips and two rolls, the excess rate is 70%, and then the mass fraction of padding is 5% NaOH solution, two dips and two rolls, the excess rate is 100%, 85% After drying at 140°C for 3 minutes, washing with water three times to remove non-covalently cross-linked chitosan, drying at 85°C, selecting reactive dyes for conventional dyeing.

Embodiment 2

[0037] Alkali pretreatment: immerse 2g of viscose fabric that has been desized, boiled and bleached in 10% NaOH solution at room temperature, soak for 10 minutes, wash 4 times with water, then soak in 5% glacial acetic acid for 45 minutes, wash with water To neutral, dry at 85°C to obtain alkali pretreated viscose fabric;

[0038] Dissolving 0.05g chitosan in 100mL of tartaric acid solution with a mass fraction of 10%, after it was completely dissolved, added 0.002moL epichlorohydrin to obtain a chitosan finishing solution;

[0039] Padding the chitosan finishing liquid through the viscose fabric pretreated by alkali, two dipping and two rolling, the excess rate is 80%, and then the mass fraction of padding is 10% NaOH solution, two dipping and two rolling, the excess rate is 80%, After drying at 80°C, bake at 150°C for 2 minutes, then wash 4 times with water to remove non-covalently cross-linked chitosan, and dry at 80°C, choose direct dyes for conventional dyeing.

Embodiment 3

[0048] Alkali pretreatment: immerse 2 g of desized, scorched and bleached hemp fabric at room temperature in 30% NaOH solution, soak for 20 minutes, wash 5 times with water, then soak in 8% glacial acetic acid for 35 minutes, and wash until Neutral, drying at 85°C to obtain alkali-pretreated hemp fabric;

[0049] 0.125g chitosan is dissolved in 100mL mass fraction and is 8% citric acid, tartaric acid mixed solution (the mol ratio of citric acid and tartaric acid is 3: 1), after it dissolves completely, add 0.005mol epichlorohydrin, Prepare chitosan finishing solution;

[0050] Padding the chitosan finishing solution on the hemp fabric pretreated by alkali, two dipping and two rolling, the excess rate is 100%, and then the mass fraction of padding is 20% NaOH solution, two dipping and two rolling, the excess rate is 90%, 85% After drying at 160°C for 1 min, then washing 5 times with water to remove non-covalently cross-linked chitosan, after drying at 85°C, choose soluble vat ...

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Abstract

The invention relates to a method for improving the dye depth of cellulose fiber fabrics by using chitosan. In the method, a polycarboxylic acid solution is used as a solvent and a cross-linking agent of chitosan and epoxy chloropropane is used as a cross-linking agent, and chitosan is covalently grafted to the surface of the cellulose fiber fabrics through padding, preliminary drying and baking at a high temperature. The combining strength of chitosan and the cellulose fiber fabrics is increased greatly, the electrostatic repulsion between the cellulose fiber fabrics and anionic dyes is reduced, the dye-uptake of dyes and the color depth of the fabrics are improved obviously, and the crease resistance of the cellulose fiber fabrics processed by using the method is improved obviously.

Description

technical field [0001] The invention belongs to the textile field, and in particular relates to a method for improving the dyeing depth of cellulose fiber fabrics with chitosan. Background technique [0002] When the cellulose fiber fabric is in contact with the aqueous solution, due to the ionization of certain groups in the cellulose macromolecules, the surface of the fabric will be negatively charged; There will be a large electrostatic repulsion, which will reduce the dye uptake rate. At present, most of them use a large amount of neutral electrolyte in the dyeing process to reduce the zeta potential of the fiber surface, reduce the electrostatic repulsion between the dye and the fiber, and increase the dye uptake rate. However, the addition of electrolytes will increase the cost of dyeing, and at the same time increase the concentration of electrolytes in dyeing wastewater, increasing the difficulty of wastewater treatment. [0003] In recent years, many researchers h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P5/22D06M15/03D06P3/60D06M101/06
Inventor 彭勇刚纪俊玲汪媛赵晓燕
Owner CHANGZHOU UNIV
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