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A kind of gel spinning method of making chitosan fiber

A chitosan fiber and gel spinning technology, which is applied in dry spinning, wet spinning, fiber treatment, etc., can solve the problems of poor mechanical properties of chitosan fibers, achieve high molecular weight and improve mechanical properties

Active Publication Date: 2020-10-02
JIAXING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the invention is to solve the problem of poor mechanical properties of chitosan fibers in the prior art, and provide a gel spinning method for manufacturing chitosan fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of gel spinning method that manufactures chitosan fiber, concrete steps are as follows:

[0039] (1) Slowly inject the β-glycerophosphate sodium aqueous solution of concentration 1mol / L in the chitosan solution of concentration 1wt% to the pH value of system to be 7.2 and obtain spinning solution, wherein, chitosan solution is obtained by the weight-average molecular weight 1×10 6 g / mol, deacetylation degree is that chitosan of 91% is dissolved in the acetic acid solution of concentration 1wt% and makes;

[0040] (2) Filtration, metering, and extrusion of the spinning solution to form a fine spinning stream, and before extrusion, the spinning solution is heated so that the temperature rises from 3°C to 30°C when it reaches the spinning hole ℃;

[0041] (3) The fine spinning stream enters the air layer with a length of 5mm, the air layer is provided with a ring blowing device, the blowing temperature is 30°C, and the blowing speed is 3m / min;

[0042] (4) spinni...

Embodiment 2

[0047] A kind of gel spinning method that manufactures chitosan fiber, concrete steps are as follows:

[0048] (1) Slowly inject the β-glycerophosphate sodium aqueous solution of concentration 0.8mol / L in the chitosan solution of concentration 1.5wt% to the pH value of system to obtain spinning solution at 7.3, wherein, chitosan solution is obtained by heavy The average molecular weight is 1.2×10 6 g / mol, deacetylation degree is that chitosan of 92% is dissolved in the hydrochloric acid solution of concentration 2wt% and makes;

[0049] (2) Filtrate, measure and extrude the spinning solution to form a thin spinning stream, and heat the spinning solution before extrusion so that the temperature rises from 4°C to 35°C when it reaches the spinning hole ℃;

[0050] (3) The fine spinning stream enters the air layer with a length of 10mm, the air layer is provided with a ring blowing device, the blowing temperature is 35°C, and the blowing speed is 5m / min;

[0051] (4) spinning f...

Embodiment 3

[0056] A kind of gel spinning method that manufactures chitosan fiber, concrete steps are as follows:

[0057] (1) Slowly inject the α-D-glucose-1-phosphate sodium saline solution of concentration 0.3mol / L in the chitosan solution of concentration 2wt% to the pH value of the system to 7.4 to obtain spinning solution, wherein, chitosan The solution was obtained by adding a weight-average molecular weight of 1.5 x 10 6 g / mol, deacetylation degree is that chitosan of 93% is dissolved in the acetic acid solution of concentration 4wt% and makes;

[0058] (2) Filtrate, measure and extrude the spinning solution to form a thin spinning stream, and heat the spinning solution before extrusion, so that the temperature rises from 5°C to 36°C when it reaches the spinning hole ℃;

[0059] (3) The fine spinning stream enters the air layer with a length of 15mm, the air layer is provided with a ring blowing device, the blowing temperature is 36°C, and the blowing speed is 6m / min;

[0060] ...

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Abstract

The invention relates to a gel spinning method for making chitosan fiber. The gel spinning method includes: enabling spinning liquid to sequentially enter an air layer, coagulating bath and plasticizing bath after being extruded through a spinneret orifice to obtain the chitosan fiber, wherein the spinning liquid is a semi-dilute solution of chitosan greater than or equal to 1x10<6>g / mol in weightaverage molecular weight, and sodium organophosphate is contained in the spinning liquid; before extruding, the spinning liquid is heated to increase temperature when the spinning liquid reaches thespinneret orifice from 3-6 DEG C to 30-40 DEG C; the air layer is provided with an air blowing device, air blowing temperature is 30-40 DEG C, temperature of the coagulating bath is 30-40 DEG C, and temperature of the plasticizing bath is 50-60 DEG C. Compared with wet-process spinning or dry-spraying wet-process spinning, the gel spinning method has obvious advantages, and the problem that chitosan fiber prepared by wet-process or dry-spraying wet-process spinning is poor in mechanical performance can be solved effectively, so that the gel spinning method has great popularization value.

Description

technical field [0001] The invention belongs to the technical field of chitosan fibers, and relates to a gel spinning method for manufacturing chitosan fibers. Background technique [0002] Chitosan fiber is a regenerated fiber usually prepared by wet spinning. It has the functions of antibacterial, hemostasis, and promotion of wound healing. It is an excellent medical and sanitary material. However, the dry breaking strength of chitosan fiber is only 1.8cN / dtex, and its mechanical properties are low, so it needs to be blended with cotton, viscose fiber, etc. The chitosan molecular chain in the spinning solution is in the conformation of random coils, and the spinning solution enters the coagulation bath directly after exiting the spinneret. The "inheritance" of sugar molecular chains leads to an isotropic disordered state of the primary fibers, while there are strong hydrogen bond interactions between chitosan molecular chains and molecular chains, making its glass transit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/04D01D5/06D01D5/14D01D5/34D01D10/06D01F1/10D01F9/00
CPCD01D5/04D01D5/06D01D5/14D01D5/34D01D10/06D01F1/10D01F9/00
Inventor 姚勇波王华平张玉梅许志李海东
Owner JIAXING UNIV
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