Preparation method of chitosan direct quaternary ammonium salt dyeing and finishing low-salt auxiliary agent
A technology of chitosan and quaternary ammonium salts, applied in dyeing, textiles and papermaking, etc., can solve the problems of hydrophilic performance, toxic and side effects, and limited increase in the dyeing rate of reactive dyes, etc.
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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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