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Method for preparing chitosan fibers

A chitosan fiber, chitosan technology, applied in spinning solution preparation, fiber chemical characteristics, wet spinning, etc., can solve the problems of poor mechanical properties of chitosan fiber, reduced molecular weight of chitosan, polydispersity, etc. , to achieve the effect of favoring orientation alignment, improving mechanical properties, and ensuring non-hydrolysis

Inactive Publication Date: 2011-09-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties of chitosan fibers are still poor at present, and one of the important reasons is that the acidic solvent used
Commonly used solvents at home and abroad are various dilute acids, and chitosan is extremely unstable in acidic solutions, which will cause partial hydrolysis of chitosan long chains and cleavage of glycosidic bonds, resulting in reduced molecular weight and polydispersity of chitosan. resulting in insufficient performance of chitosan fiber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1) Take each component according to the weight percentage content: 9.0g chitosan, 12.0g lithium hydroxide, 1.5g sodium hydroxide, 18.0g urea, 0.3g glycerol, and the rest are water, a total of 300g; Swell for 3 hours after mixing, freeze the swelling solution at -60°C for 1 hour, and then thaw at room temperature to obtain a chitosan solution;

[0014] 2) The chitosan solution is filtered and degassed by a centrifuge to obtain a chitosan spinning solution;

[0015] 3) The chitosan spinning solution is injected into a coagulation bath with a temperature of 30 ° C to form fibers, and the coagulation bath used is 18.0% H 2 SO 4 , to obtain chitosan fibrils;

[0016] 4) After the chitosan primary fiber was washed with water at 25°C, it was air-dried at 20°C. White chitosan fibers were obtained.

Embodiment 2

[0018] 1) Take each component according to the weight percentage content: 9.0g chitosan, 15.0g lithium hydroxide, 3.0g sodium hydroxide, 18.0g urea, 1.5g glycerol, and the rest are water, a total of 300g; Swell for 3 hours after mixing, freeze the swelling solution at -40°C for 2 hours, and then thaw at room temperature to obtain a chitosan solution;

[0019] 2) The chitosan solution is filtered and degassed by a centrifuge to obtain a chitosan spinning solution;

[0020] 3) The chitosan spinning solution is injected into a coagulation bath with a temperature of 30 ° C to form fibers, and the coagulation bath used is H with a mass fraction of 10.0 % 2 SO 4 and ethanol in a volume ratio of 2:7 to obtain chitosan protofibers;

[0021] 4) After washing the primary chitosan fibers at 5°C, they were dried at 50°C to obtain white chitosan fibers.

Embodiment 3

[0023] 1) Take each component according to the weight percentage content: 9.0g chitosan, 15.0g lithium hydroxide, 1.5g sodium hydroxide, 21.0g urea, 1.5g glycerol, and the rest are water, a total of 300g; Swell for 3 hours after mixing, freeze the swelling solution at -30°C for 3 hours, and then thaw at room temperature to obtain a chitosan solution;

[0024] 2) The chitosan solution is filtered and degassed by a centrifuge to obtain a chitosan spinning solution;

[0025] 3) The chitosan spinning solution was injected into a coagulation bath with a temperature of 30 ° C to form fibers, and the coagulation bath used was 8.0% H 2 SO 4 , ethanol and mass fraction are 5.0% NaCl by volume ratio 3:6:1 mixed solution, obtain chitosan protofiber;

[0026] 4) Washing the primary chitosan fibers with water at 10°C and drying at 30°C to obtain white chitosan fibers.

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PUM

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Abstract

The invention discloses a method for preparing chitosan fibers, which comprises the following steps: mixing 2.0 to 6.0 weight percent of chitosan, 4.0 to 6.0 weight percent of lithium hydroxide, 0.5 to 4.0 weight percent of urea, 0.1 to 3.0 weight percent of glycerol and the balance of water, and swelling to prepare chitosan spinning solution; and spinning by a wet-process spinning method, coagulating and precipitating in a coagulating bath to form protofilaments, washing, drawing, and drying to obtain the chitosan fibers. In the invention, the spinning solution is prepared by dissolving chitosan in an alkaline solvent, the chitosan macromolecular chains exist in a high-swelling state, the arrangement of the chitosan macromolecular chains is more compact, the high instability of the chitosan in acidic solution is overcome, the hydrolysis of the chitosan macromolecular chains and the breakage of the glucosidic bonds are avoided, the oriented arrangement of the macromolecular chains is promoted, and the mechanical properties of the chitosan fibers are improved.

Description

technical field [0001] The invention relates to a novel preparation method of chitosan fiber. Background technique [0002] Chitosan fiber has the advantages of broad-spectrum antibacterial, high antibacterial efficiency and non-toxicity; at the same time, it has biodegradability, bioactivity and the ability to adsorb metal ions, and it has been proved to promote new skin generation and accelerate healing through clinical application. Speed, reduce pain and other functions, can be used in medical sutures, medical non-woven fabrics, hemostatic cotton, artificial skin and tissue engineering and other fields. With the expansion of the scope of application, the demand for chitosan fiber is bound to increase. However, the mechanical properties of chitosan fibers are still poor at present, and one of the important reasons is the acidic solvent used. Commonly used solvents at home and abroad are various dilute acids, and chitosan is extremely unstable in acidic solutions, which w...

Claims

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Application Information

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IPC IPC(8): D01F9/00D01D1/02D01D5/06D01D5/14
Inventor 胡巧玲李友良艾锋张雨菲邓海琴张珂
Owner ZHEJIANG UNIV
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