Preparation method for hydroxyethyl group chitosan fiber

A technology of hydroxyethyl chitosan and chitosan fiber, which is applied in fiber processing, medical science, textiles and papermaking, etc., can solve the problems of increasing emissions or recycling costs, incomplete reaction, etc., and achieves degree of substitution control, replacement Easy to absorb and retain liquid

Inactive Publication Date: 2011-11-09
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 5 g of chitosan fibers in 100 ml of a mixed solvent with a volume ratio of 35 / 65 ethanol / isopropanol, add 12.5 g of sodium hydroxide solution with a concentration of 25 wt %, and after alkalization at 10 ° C for 45 minutes, add 20 wt % of 20 g of an isopropanol solution of oxyethane (molar ratio 2.92), the system was sealed and heated to 40° C. to carry out hydroxyethylation modification. After two hours, the reaction was terminated, the fibers were taken out and dispersed in an 80 vol% ethanol aqueous solution, 10 vol% acetic acid aqueous solution was added dropwise to neutrality, and then washed with 80 vol% ethanol for three times, and finally dehydrated with absolute ethanol and dried in the air. The substitution degree 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 min, hang it for 30 s without droplets dripping, and weigh it. The water absorption of the fiber is 27 times its own weight. Then, the fiber after suction was placed in a centrifuge tube, and centrifuged at a speed of 1200 rpm for 15 min to separate the free liquid. The water retained by the fiber was 12 times its own weight. The water absorption and water retention of the initial chitosan fibers were 2.1 times and 1.1 times their own weight, respectively.

Embodiment 3

[0030] Immerse 5g of chitosan fibers in 100ml of a mixed solvent with a volume ratio of 35 / 65 ethanol / isopropanol, add 12.5g of sodium hydroxide solution with a concentration of 35%, and after alkalization at 10 ° C for 90 minutes, add 20wt% 20 g of isopropanol solution of oxyethane, the system is sealed and heated to 40°C for hydroxyethylation modification. After 4 hours, the reaction was terminated, the fibers were taken out and dispersed in 80 vol% ethanol aqueous solution, 10 vol% acetic acid aqueous solution was added dropwise to neutrality, washed three times with 80 vol% ethanol, and finally dehydrated with absolute ethanol and air-dried. The substitution degree of hydroxyethyl chitosan fibers was 51%, the liquid absorption was 29, and the water retention was 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 solutionof 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, addingacetic 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 found 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 dilute hydrochloric acid, nitric acid and other inorganic acids and most organic dilute acids. Chitosan fibers are obtained by dissolving chitosan in an aqueous acetic acid solution to form a spinning slurry with a concentration of 3-5wt%, and extruding into a coagulation bath composed of dilute alkali and ethanol through a spinneret hole (JP 60,059,123,1985). [0003] Chitosan fiber has biocompatibility, biodegradability, non...

Claims

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Application Information

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Patent Type & Authority Patents(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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