Method for preparing chitosan fibers

A chitosan fiber, chitosan technology, applied in the direction of spinning solution preparation, fiber chemical characteristics, wet spinning method, etc., can solve the problems of poor mechanical properties of chitosan fiber, chitosan molecular weight reduction, polydispersity, etc. , to achieve the effect of facilitating alignment, improving mechanical properties, and ensuring no hydrolysis

Inactive Publication Date: 2012-07-04
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: 9.0g chitosan, 12.0g lithium hydroxide, 1.5g sodium hydroxide, 18.0g urea, 0.3g glycerol, and the rest is water, a total of 300g; After mixing, swell for 3 hours, 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 defoamed by a centrifuge to obtain a chitosan spinning solution;

[0015] 3) Inject the chitosan spinning solution into a coagulation bath that coagulates into filaments at a temperature of 30℃, and the coagulation bath used is 18.0% H 2 SO 4 , Get the primary chitosan fiber;

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

Embodiment 2

[0018] 1) Take each component according to weight percentage: 9.0g chitosan, 15.0g lithium hydroxide, 3.0g sodium hydroxide, 18.0g urea, 1.5g glycerol, and the rest is water, a total of 300g; After mixing, swell for 3 hours, 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 defoamed by a centrifuge to obtain a chitosan spinning solution;

[0020] 3) Inject the chitosan spinning solution into a coagulation bath that coagulates into filaments at a temperature of 30°C, and the coagulation bath used is 10.0% H 2 SO 4 A mixture of 2:7 volume ratio with ethanol to obtain primary chitosan fibers;

[0021] 4) The primary chitosan fibers are washed at 5°C and dried at 50°C to obtain white chitosan fibers.

Embodiment 3

[0023] 1) Take each component according to weight percentage: 9.0g chitosan, 15.0g lithium hydroxide, 1.5g sodium hydroxide, 21.0g urea, 1.5g glycerol, and the rest is water, totaling 300g; After mixing, swell for 3 hours, 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 defoamed by a centrifuge to obtain a chitosan spinning solution;

[0025] 3) Inject the chitosan spinning solution into a coagulation bath that coagulates into filaments at a temperature of 30℃ to form fibers. The coagulation bath used is H with a mass fraction of 8.0% 2 SO 4 , A mixture of ethanol and 5.0% NaCl in a volume ratio of 3:6:1 to obtain primary chitosan fibers;

[0026] 4) The primary chitosan fibers are washed at 10°C and dried at 30°C to obtain white chitosan fibers.

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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, biological activity and the ability to adsorb metal ions, and has been clinically applied to prove that it can promote new skin formation and accelerate healing Speed, pain reduction and other functions can be applied to medical sutures, medical non-woven fabrics, hemostatic cotton, artificial skin, 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, and one of the important reasons is the acid solvent used. Commonly used solvents at home and abroad are various dilute acids, and chitosan is extremely unstable in acidic solutions, which will cause pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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