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Method for preparing chitosan modified carboxylation cotton fabric in ionic liquid medium

A chitosan modification, ionic liquid technology, applied in plant fiber, biochemical fiber treatment, textiles and papermaking, etc., can solve the problems of mechanical mechanical damage of fabrics, various finishing liquid components, and high process equipment requirements, and achieve mechanical properties. Small damage, increased selectivity and oxidation rate, and promising effects

Active Publication Date: 2019-02-15
SHAOXING MAIBAO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chemical cross-linking agents coat a layer of chemical substances on the surface of natural cotton fibers, which will have a negative impact on the fine style of cotton fabrics and human health, and high-temperature baking will also cause mechanical damage, yellowing, and poor hand feeling of the fabrics. [Wang Jiangang, Gan Yingjin, Liu Yunjuan, Chen Dongsheng. Effects of Chitosan and Polycarboxylic Acids on Antibacterial and Anti-Wrinkle Finishing of Cotton Fabrics. Journal of Jiangnan University, 2007,6(5):598-601]
The cotton fabric modified by trimethoxybenzoyl chitosan disclosed in the invention patent CN106521950A uses trimethoxybenzoyl chitosan to exert antibacterial and anti-ultraviolet effect, and uses organic polycarboxylic acid and amino silicone oil emulsion as crosslinking agents to improve The crosslinking and bonding of chitosan and cotton fabric can improve the antibacterial, anti-shrinkage, anti-wrinkle, anti-ultraviolet and other functions of cotton fabric, but the finishing solution has many components, the preparation of finishing agent is complicated, and the modified fabric needs padding, pre-treatment, etc. Baking and high-temperature baking require high process equipment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Method for preparing chitosan modified carboxylation cotton fabric in ionic liquid medium
  • Method for preparing chitosan modified carboxylation cotton fabric in ionic liquid medium
  • Method for preparing chitosan modified carboxylation cotton fabric in ionic liquid medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Mix the ionic liquid 1-hydro-3-methylimidazolium chloride with 1-allyl-3-methylimidazolium chloride in a mass ratio of 1:9, and then dry at 105° C. for 2 hours to obtain ionic liquid liquid mixture;

[0028] (2) Dissolve chitosan with a viscosity-average molecular weight of 250,000 and a degree of deacetylation of 91.6% in a 0.5 mol / L acetic acid solution, dropwise add a 1.0 mol / L sodium hydroxide solution until the pH of the solution is about 7.5, After the white chitosan precipitate is completely precipitated, it is fully smashed, washed with water until neutral, and then filtered; the chitosan precipitate was soaked in 150 mL of absolute ethanol and ultrasonically oscillated for 3 times (ultrasonic power was 326 W) for 30 minutes each time. The water in the chitosan precipitation is replaced, filtered, and vacuum-dried at 70° C. for 4 hours, and pulverized to obtain low-crystalline chitosan; then the low-crystalline chitosan is added to the ionic liquid mixture p...

Embodiment 2

[0032] (1) Mix the ionic liquid 1-hydro-3-methylimidazolium chloride with 1-allyl-3-methylimidazolium chloride in a mass ratio of 2:8, and then dry at 110° C. for 2 hours to obtain ionic liquid liquid mixture;

[0033] (2) Dissolve chitosan with a viscosity average molecular weight of 250,000 and a degree of deacetylation of 91.6% in a 0.6 mol / L acetic acid solution, add dropwise a 1.2 mol / L sodium hydroxide solution until the pH of the solution = about 7.5, After the white chitosan precipitate is completely precipitated, it is fully smashed, washed with water until neutral, and then filtered; the chitosan precipitate was soaked in 200 mL of absolute ethanol, and ultrasonically oscillated 4 times (ultrasonic power was 382 W) for 30 min each time. The water in the chitosan precipitation is replaced, filtered, and vacuum-dried at 75° C. for 5 hours, and pulverized to obtain low-crystalline chitosan; then the low-crystalline chitosan is added to the ionic liquid mixture prepared ...

Embodiment 3

[0037] (1) Mix the ionic liquid 1-hydro-3-methylimidazolium chloride with 1-allyl-3-methylimidazolium chloride in a mass ratio of 1:4, and then dry at 115° C. for 1.5 hours to obtain Ionic liquid mixture;

[0038] (2) Dissolve chitosan with a viscosity average molecular weight of 250,000 and a degree of deacetylation of 91.6% in a 0.6 mol / L acetic acid solution, add dropwise a 1.2 mol / L sodium hydroxide solution until the pH of the solution = about 7.5, After the white chitosan precipitate is completely precipitated, it is fully smashed, washed with water until neutral, and then filtered; the chitosan precipitate was soaked in 200 mL of absolute ethanol and ultrasonically oscillated for 3 times (ultrasonic power was 415 W) for 30 minutes each time. The water in the chitosan precipitation is replaced, filtered, and vacuum-dried at 78° C. for 4 hours, and pulverized to obtain low-crystalline chitosan; then the low-crystalline chitosan is added to the ionic liquid mixture prepare...

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Abstract

The invention discloses a method for preparing a chitosan modified carboxylation cotton fabric in an ionic liquid medium. The method is characterized by comprising the following steps: firstly, dissolving low-crystallization chitosan into an ionic liquid, carrying out selective oxidation on a cotton fabric after desizing and boiling in isopropanol in a concentrated nitric acid / strong phosphoric acid-sodium nitrite system, further stirring a carboxylation cotton fabric and chitosan in the ionic liquid medium at 30-40 DEG C to implement an amide chemical reaction, removing the ionic liquid, carrying out vacuum drying and water washing, thereby obtaining the chitosan modified carboxylation cotton fabric. The method disclosed by the invention is simple and feasible, rapid in amide reaction, high in grafting rate, possible in ionic liquid recycling and green and environmentally friendly, the prepared chitosan amide modified cotton fabric has a long-lasting and efficient antibacterial capability, is affiliative to human bodies, is safe and sanitary and good in wearing comfort, overcomes adverse influence caused by chemical cross-linking agents and acid solutions upon excellent propertiesof cotton fabrics and human health in conventional chitosan modification, and has wide practical application prospects.

Description

technical field [0001] The invention relates to a preparation method of chitosan-modified carboxylated cotton fabric in an ionic liquid medium, in particular to using ionic liquid as a solvent and a reaction medium to graft chitosan amide to carboxylated cotton fabric, which belongs to the functional finishing of textiles technology field. Background technique [0002] Natural cotton fiber is rich in resources and renewable. Its fabric has the advantages of softness, comfortable wearing, moisture absorption and breathability, good human affinity, easy dyeing, and biodegradability. However, cotton fabrics tend to shrink and wrinkle during wearing and washing. In particular, cotton fabrics have good hydrophilicity, which provides a suitable environment for the reproduction of microorganisms, which not only discolors, stinks, and reduces mechanical properties of the fabrics, but also causes bacterial infections in the human body, causing the spread of various diseases, and posi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/03D06M11/70D06M11/64D06M13/144D06M13/352D06M101/06
CPCD06M11/64D06M11/70D06M13/144D06M13/352D06M15/03D06M16/00D06M2101/06D06M2200/20
Inventor 许云辉杨晓娜王旭晨郑晨旭郑清霞谢文东
Owner SHAOXING MAIBAO TECH CO LTD
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