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Water-soluble oxidized chitosan and method for finishing fabric by using water-soluble oxidized chitosan

An oxidized chitosan, water-soluble technology, applied in the direction of enzyme/microorganism biochemical treatment, biochemical fiber treatment, fiber treatment, etc., can solve the problems of difficult practical application, large amount of reagents, long processing time, etc. The effect of reaction probability, avoiding long reaction time, and fast catalytic reaction speed

Active Publication Date: 2022-02-01
ANHUI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the lack of chemical bonds between chitosan and textile fibers, it is necessary to dissolve chitosan in an acidic solution containing a cross-linking agent, and bake it at high temperature (150-175°C) through the "bridging" effect of the chemical cross-linking agent. Chitosan is grafted on the fiber, but the high-temperature baking makes the fabric feel and strength decrease, and the chemical crosslinking agent coated on the surface of the natural fiber has a negative impact on the human body [Wang Jiangang, Wang Yali, Ge Mingqiao, etc. Citric acid and shell Study on Antibacterial Finishing of Cotton Fabrics with Polysaccharides. Acta Textile Sinica, 2006,27(1):89-92]
At the same time, the extremely strong hydrogen bonding force in and between chitosan molecules makes it difficult to dissolve in water, alkali and most organic solvents, and can only be dissolved in acid solutions, but acid solutions are volatile, difficult to recycle, and highly corrosive. , pollute the environment and other shortcomings, which greatly limit the application of chitosan ):421-430]
Therefore, domestic and foreign scholars have modified and chemically modified chitosan to improve its water solubility and chemical reactivity. At present, the main research methods include alkylation, acylation, grafting, crosslinking, carboxylation, quaternary ammonium Salinization, etc., the principle, process and product functionality of chitosan modification are quite different
[0004] The cotton fabric modified by trimethoxybenzoyl chitosan disclosed in the invention patent CN106521950A realizes the chemical grafting of chitosan and cotton fabric through organic polycarboxylic acid and amino silicone oil emulsion as crosslinking agent, which improves the cotton fabric Antibacterial, anti-shrinkage, anti-wrinkle and dyeing properties, but the finishing solution has many ingredients, a large amount of reagents, and requires complex finishing processes such as padding, pre-baking and high-temperature baking. The processing time is long and the requirements for process equipment are high, so it is difficult to apply

Method used

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  • Water-soluble oxidized chitosan and method for finishing fabric by using water-soluble oxidized chitosan
  • Water-soluble oxidized chitosan and method for finishing fabric by using water-soluble oxidized chitosan
  • Water-soluble oxidized chitosan and method for finishing fabric by using water-soluble oxidized chitosan

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Experimental program
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Effect test

Embodiment 1

[0040] The water-soluble oxidized chitosan of the present embodiment is prepared according to the following steps:

[0041] (1) Dissolution of chitosan: chitosan with a viscosity-average molecular weight of 825,000 and a deacetylation degree of 95.2% is added to 1-carboxymethyl-3-methylimidazolium bisulfate ionic liquid at 95°C Continue stirring until the chitosan is completely dissolved to obtain a mass concentration of 4% chitosan / ionic liquid solution;

[0042] (2) The preparation of dialdehyde chitosan: in the chitosan / ionic liquid solution of step (1), add dropwise the NaOH solution of 0.5mol / L to adjust its pH value to 4.5, then add sodium periodate oxidizing agent to make it With a concentration of 0.5g / L, the resulting reaction solution was oxidized under microwave radiation conditions (power 200W, radiation temperature 30°C) in the dark and stirred for 30 minutes, adding absolute ethanol to terminate the reaction, and the reaction solution was filtered to remove insol...

Embodiment 2

[0057] The water-soluble oxidized chitosan of the present embodiment is prepared according to the following steps:

[0058] (1) Dissolution of chitosan: chitosan with a viscosity-average molecular weight of 825,000 and a deacetylation degree of 95.2% is added to 1-carboxymethyl-3-methylimidazolium bisulfate ionic liquid at 95°C Continue stirring under continuous stirring and make chitosan dissolve completely, obtain mass concentration and be 4% chitosan / ionic liquid solution;

[0059] (2) The preparation of dialdehyde chitosan: in the chitosan / ionic liquid solution of step (1), add dropwise the NaOH solution of 0.5mol / L to adjust its pH value to 4.5, then add sodium periodate oxidizing agent to make it With a concentration of 1g / L, the reaction solution was stirred and oxidized for 40 minutes under microwave radiation conditions (power 280W, radiation temperature 35°C) in the dark, and absolute ethanol was added to terminate the reaction, and the reaction solution was filtered...

Embodiment 3

[0073] The water-soluble oxidized chitosan of the present embodiment is prepared according to the following steps:

[0074] (1) Dissolution of chitosan: chitosan with a viscosity-average molecular weight of 825,000 and a deacetylation degree of 95.2% is added to 1-carboxymethyl-3-methylimidazolium bisulfate ionic liquid at 95°C Continue stirring under continuous stirring and make chitosan dissolve completely, obtain mass concentration and be 4% chitosan / ionic liquid solution;

[0075] (2) The preparation of dialdehyde chitosan: in the chitosan / ionic liquid solution of step (1), add dropwise the NaOH solution of 0.5mol / L to adjust its pH value to 4.5, then add sodium periodate oxidizing agent to make it With a concentration of 1.5g / L, the reaction solution was stirred and oxidized for 45 minutes under microwave radiation conditions (power 320W, radiation temperature 40°C) in the dark, and absolute ethanol was added to terminate the reaction, and the reaction solution was filter...

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Abstract

The invention discloses water-soluble oxidized chitosan and a finishing method of the water-soluble oxidized chitosan on a fabric. The water-soluble oxidized chitosan is prepared by the following steps: dissolving chitosan in a 1-carboxymethyl-3-methylimidazolium hydrogen sulfate aqueous solution, oxidizing C2 and C3 sites of the chitosan by sodium periodate under microwave radiation to generate aldehyde groups, and then oxidizing primary hydroxyl at C6 site of the dialdehyde chitosan in an ionic liquid by concentrated nitric acid-concentrated phosphoric acid to generate carboxyl. The water-soluble oxidized chitosan can be used for modifying fabrics. Compared with a traditional chemical cross-linking agent modified fabric, the method has the advantages that the grafting efficiency of the oxidized chitosan is high, the enzyme treatment condition is mild, the reaction process is simple, the fabric is crease-resistant, antibacterial, efficient and lasting, the fabric is comfortable to wear, and the requirements of people on lasting functional ecological textiles are met.

Description

technical field [0001] The invention relates to a water-soluble oxidized chitosan and a fabric finishing method thereof, belonging to the technical field of textile functional finishing. Background technique [0002] Textiles are favored by people because of their good human affinity, comfortable wearing, moisture absorption and breathability, safety and sanitation, and low price. Due to the large specific surface area and strong hygroscopicity of textiles, suitable conditions are created for the reproduction and spread of microorganisms, which not only lead to fabric performance damage, mildew, stains and fading, but even cause the spread of diseases, posing a threat to human health. . In the 21st century, with the ravages of bird flu, EBOLA, ZIKA and other viruses, especially the current global spread of new coronaviruses, safe, environmentally friendly, efficient and durable antibacterial and anti-virus functional textiles have been developed to protect the human body fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/03D06M16/00D06M13/352D06M11/05C08B37/08D06M101/06
CPCD06M15/03D06M16/003D06M13/352D06M11/05D06M16/00C08B37/003D06M2101/06D06M2200/20Y02P20/54
Inventor 邓梦晴许云辉张月郭仕豪许成刚丁文倩魏治国
Owner ANHUI AGRICULTURAL UNIVERSITY
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