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Preparation method for hydroxyethyl group chitosan fiber

A technology of hydroxyethyl chitosan and chitosan fiber, which is used in fiber processing, medical science, textiles and papermaking, etc., can solve the problems of increasing emission or recovery costs, and incomplete response, reducing the number of replacements and reducing Painful, avoids re-damaging effects

Inactive Publication Date: 2009-02-18
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, haloacetic acid reacts with chitosan, and the substitution position is uncertain, while haloethanol is a highly toxic chemical and cannot be completely reacted, which increases the cost of discharge or recycling

Method used

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  • Preparation method for hydroxyethyl group chitosan fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Immerse 5g of chitosan fibers in 100ml of mixed solvent with a volume ratio of 35 / 65 ethanol / isopropanol, add 12.5g of sodium hydroxide solution with a concentration of 25wt%, alkalinize at 10°C for 45 minutes, add 20wt% cyclo 20 g of isopropanol solution of oxyethane (molar ratio 2.92), the system was sealed and heated to 40° C. for hydroxyethylation modification. Two hours later, the reaction was terminated, the fibers were taken out and dispersed in 80vol%% ethanol aqueous solution, 10vol% acetic acid aqueous solution was added dropwise to neutrality, then washed with 80vol% ethanol for 3 times, finally dehydrated with absolute ethanol, and dried in the air. The degree of substitution of hydroxyethyl chitosan fiber is 45%.

Embodiment 2

[0028] Put 0.2 g of the fiber obtained in Example 1 into deionized water, take it out after 10 minutes, hang it for 30 seconds and weigh it after no liquid drips out. The water absorption of the fiber is 27 times its own weight. Then the fiber after absorbing liquid is placed in the centrifuge tube, centrifuged at a speed of 1200rpm for 15min to separate the free liquid, and the water retained by the fiber is 12 times of its own weight. The water absorption and water retention of the initial chitosan fiber were 2.1 times and 1.1 times its own weight, respectively.

Embodiment 3

[0030] Immerse 5g of chitosan fibers in 100ml of mixed solvent with a volume ratio of 35 / 65 ethanol / isopropanol, add 12.5g of 35% sodium hydroxide solution, alkalinize at 10°C for 90 minutes, add 20wt% cyclo The isopropanol solution of oxyethane is 20g, and the system is sealed and heated to 40°C for hydroxyethylation modification. After 4 hours, the reaction was terminated, the fiber was taken out and dispersed in 80vol% ethanol aqueous solution, 10vol% acetic acid aqueous solution was added dropwise to neutrality, then washed with 80vol% ethanol for 3 times, finally dehydrated with absolute ethanol, and dried in the air. The degree of substitution of hydroxyethyl chitosan fiber is 51%, the liquid absorption is 29, and the water retention is 13.

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Abstract

The invention relates to a hydroxyethyl chitosan fiber preparation method, including the following steps: (1)dispersing chitosan fiber in the mixed solvent of ethanol and isopropanol, adding aqueous alkali, maintaining the temperature of the system in the range of minus 10 DEG C to 20 DEG C, dipping for 5-120min and then basifying to produce basified chitosan fiber; (2)adding isopropanol solution of epoxy ethane into the above system and rising the temperature of the system to 30-70 DEG C, then etherifying for 0.5-8h, taking out of the fiber and dispersing the fiber in ethanol aqueous, adding acetic acid solution drop by drop until the mixture becomes neutral, then washing with ethanol, dehydrating through anhydrous ethanol, and finally airing in air. In this way, partially substituted hydroxyethyl chitosan fiber can be prepared. Hydroxyethyl chitosan fiber with liquid adsorption and liquid retention capabilities can be prepared by introducing hydrophilic hydroxyethyl groups to the chain of chitosan macromolecule. The hydroxyethyl chitosan fiber has potential application value on the treatment of serous wounds; the preparation method is simple, and the substitution degree is easy to control.

Description

technical field [0001] The invention belongs to the field of preparation of fiber materials, in particular to a preparation method of hydroxyethyl chitosan fiber. Background technique [0002] Chitin is a polysaccharide composed of 2-acetyl-2-amino-2-deoxy-D-glucose linked by β-1,4 glycosidic bonds, widely present in the shells of shrimp, crabs, insects, and fungi In the cell walls of algae and algae, it is the second largest renewable organic resource on earth after cellulose. Chitosan is the deacetylation product of chitin, which can be dissolved in inorganic acids such as dilute hydrochloric acid and nitric acid, as well as most organic dilute acids. Chitosan is dissolved in acetic acid aqueous solution to form a spinning slurry with a concentration of 3-5 wt%, and extruded through a spinneret into a coagulation bath composed of dilute alkali and ethanol to obtain chitosan fibers (JP 60,059,123,1985). [0003] Chitosan fiber is biocompatible, biodegradable, non-toxic, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/38D06M13/11A61L15/28
Inventor 刘永乐刘兆峰吴清基胡盼盼
Owner DONGHUA UNIV
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