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Preparation method of chitosan direct quaternary ammonium salt dyeing and finishing low-salt assistant

A chitosan, quaternary ammonium salt technology, applied in dyeing, textiles and papermaking, etc., can solve the problems of hydrophilic performance, toxic and side effects, and limited increase in reactive dyes dyeing rate.

Active Publication Date: 2015-11-04
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has a great influence on the hydrophilic properties of cotton fabric itself, the improvement of the dyeing rate of reactive dyes is limited, there are certain toxic and side effects, and it is not easy to biodegrade and other defects.

Method used

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  • Preparation method of chitosan direct quaternary ammonium salt dyeing and finishing low-salt assistant
  • Preparation method of chitosan direct quaternary ammonium salt dyeing and finishing low-salt assistant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put 1.0g of chitosan (molecular weight: 50,000) in a three-necked flask, and add 40mL of N-methylpyrrolidone, 2.65g of potassium iodide, 5.5mL of 15% sodium hydroxide solution, and 5.75mL of methyl iodide into the flask. The flask was placed in a stirrer and stirred rapidly, the mixture turned pale yellow. Stir and reflux in a water bath at 60° C. for 75 min. After the reaction is complete, a golden yellow solution is obtained. Pour the resulting solution into 40 mL of 5% sodium chloride solution to exchange iodide ions, and stir for 120 min. It was then poured into a large amount of absolute ethanol and stirred. The mixture was placed in a refrigerator at 4°C for precipitation overnight, and the supernatant was discarded to obtain a light yellow precipitate. The precipitate was washed three times with a large amount of absolute ethanol and petroleum ether, and centrifuged for 10 minutes at a speed of 3000 rpm. The product was vacuum-dried in a vacuum drying oven to ...

Embodiment 2

[0018] The first step of synthesis: Weigh 1.0g of chitosan (molecular weight: 50,000) and place it in a three-necked flask, add N-methylpyrrolidone 40mL, potassium iodide 2.65g, 15% sodium hydroxide solution 5.5mL, methyl iodide 5.75mL. The flask was placed in a stirrer and stirred rapidly, the mixture turned pale yellow. Stir and reflux in a water bath at 60° C. for 75 min. After the reaction is complete, a golden yellow solution is obtained. Pour the resulting solution into a large amount of absolute ethanol and stir, put it in a refrigerator at 4°C to precipitate overnight, pour off the supernatant to obtain a light yellow precipitate, wash the precipitate with a large amount of absolute ethanol 3 times, and centrifuge for 10 minutes , the speed was 3000 rpm, and the product was dried in a vacuum oven to obtain a pale yellow solid precipitate. The second step of synthesis: the product obtained in the first step of synthesis was dissolved in 40 mL of N-methylpyrrolidone an...

Embodiment 3

[0020] Repeat the first step of the experiment in group A2 to synthesize. The second step of synthesis: Add 40mL of N-methylpyrrolidone, heat to 60°C, then add 2.65g of potassium iodide, 3.5mL of iodomethane, and 5.5mL of 15% sodium hydroxide solution, stir rapidly, and heat, stir and reflux in a water bath at 60°C for 240min After the reaction, the product was poured into 40 mL of 5% sodium chloride solution to exchange iodide ions, and the resulting solution was added dropwise to a large amount of acetone, stirred rapidly, precipitated overnight, and the supernatant was discarded. The precipitate was washed three times with a large amount of absolute ethanol and petroleum ether respectively, and centrifuged for 10 min at a speed of 3000 rpm. The obtained precipitate was vacuum-dried in a vacuum drying oven to obtain chitosan quaternary ammonium salt group A3.

[0021] The above-mentioned sample adopts the following method to test its low-salt dyeing effect for cotton fabric...

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Abstract

The invention relates to a chitosan direct quaternary ammonium salt for low-salt dyeing of reactive dyes and a preparation method of the chitosan direct quaternary ammonium salt. With chitosan and methyl iodide as raw materials, and potassium iodide as a catalyst, chitosan derivatives are subjected to friedel-crafts reaction in an alkaline solution to generate the chitosan direct quaternary ammonium salt. The chitosan direct quaternary ammonium salt obtained by the preparation method is biodegradable, and is applied to low-salt dyeing assistants of reactive dye cotton fabrics; and the salt dosage when the reactive dye cotton fabrics are dyed is effectively reduced under the premise of not affecting the dye uptake of the reactive dyes.

Description

technical field [0001] The invention relates to a textile auxiliary agent and a preparation method thereof, in particular to a direct quaternary ammonium salt of chitosan used for low-salt dyeing of cotton fabrics with reactive dyes and a preparation method thereof. Background technique [0002] Reactive dyes not only have complete chromatograms, bright colors, and relatively simple application processes, but also can form covalent bonds with many fibers, and have received widespread attention. However, the most prominent problem of reactive dyes is the low color fixation rate. In order to improve its dyeing rate, a large amount of inorganic salt is added in the traditional dyeing process of cotton fiber. According to the structure and color of the dye, the amount of salt used is generally 30~ 100g / l. The addition of a large amount of inorganic salts causes serious environmental pollution and destroys the ecological balance. Therefore, the development of low-salt dyeing au...

Claims

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Application Information

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IPC IPC(8): D06P1/48D06P1/38D06P3/66C08B37/08
Inventor 贾永堂董凤春于晖
Owner WUYI UNIV
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