CN111876851A - Chitin-chitosan nano composite fiber and preparation method and application thereof - Google Patents
Chitin-chitosan nano composite fiber and preparation method and application thereof Download PDFInfo
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/14—Macromolecular materials
- A61L27/20—Polysaccharides
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L27/507—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials for artificial blood vessels
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D1/00—Treatment of filament-forming or like material
- D01D1/02—Preparation of spinning solutions
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/06—Wet spinning methods
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
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Abstract
The invention is suitable for the technical field of fiber materials, and provides a chitin-chitosan nano composite fiber and a preparation method and application thereof, wherein the preparation method comprises the following steps: placing the chitin nanofibrils in water for homogenization treatment to obtain chitin aqueous suspension; adding chitosan powder into the chitin aqueous suspension, and uniformly mixing to obtain a mixed solution; adding an acetic acid aqueous solution into the mixed solution, and uniformly mixing to obtain a spinning solution; filtering and degassing the spinning stock solution, and then placing the spinning stock solution in a precipitator for coagulating bath and stretching treatment to obtain the chitin-chitosan nano composite fiber; the precipitant includes ethanol and NaOH solution. The invention uses chitin nanofibrils as a reinforcing material, uses chitosan which is a derivative of the chitin nanofibrils as a matrix material, and prepares the nano composite fiber by a wet spinning process, thereby obtaining the nano composite fiber with ordered orientation structure which has high strength, high rigidity, biodegradability, no cytotoxicity and eco-friendliness.
Description
Technical Field
The invention belongs to the technical field of fiber materials, and particularly relates to a chitin-chitosan nano composite fiber as well as a preparation method and application thereof.
Background
Chitosan is an N-deacetylated product of chitin, and is an ideal polymer with the characteristics of bioabsorbability, no cytotoxicity, and small environmental impact of the processing process. Since the properties of chitosan-based materials are unstable and their strength and rigidity are reduced in a wet environment, chitin nanoparticles or inorganic chrysotile nanotubes may be added to the chitosan matrix in order to optimize the mechanical properties of the chitosan-based materials. Through the property research of the composite material, the 1% -3% chrysotile nanotube is added to induce the preferred orientation of the chitosan matrix, and the strength and the Young modulus of the chitosan matrix can be increased to different degrees. However, since the chrysotile nanotubes have biodegradability and remain in the tissue body for a long time, it is necessary to develop a material having absorbability and no cytotoxicity for both the matrix and the filling material.
In addition, in the prior art, the process for preparing chitosan fiber is usually dry spinning, and the process comprises the steps of dissolving chitosan by using a solvent with a lower melting point and easy volatilization to prepare a spinning stock solution, then spraying the spinning stock solution from a spinning nozzle into a spinning channel under the action of pressure, introducing hot air flow into the spinning channel, and under the action of the hot air flow in the spinning channel, quickly volatilizing the low-boiling-point volatile solvent in the stock solution trickle, taking volatilized solvent steam away by the hot air flow, gradually solidifying the chitosan in the spinning stock solution along with the continuous volatilization of the solvent, and finally forming the chitosan fiber by lengthening and thinning under the action of winding tension. This method has the following disadvantages: in the dry spinning process, due to the problems of high viscosity, more impurities and the like of the chitosan spinning solution, spinneret orifices and filters are often blocked; and the fibers are easy to be adhered, and sectional washing, drying and the like are needed to be adopted in the subsequent spinning process, so that the difficulty of wet spinning is increased. Meanwhile, the dry spinning process is not favorable for orientation of chitosan to form high-strength fibers.
Disclosure of Invention
The embodiment of the invention aims to provide a preparation method of chitin-chitosan nano composite fiber, aiming at solving the problems in the background technology.
The embodiment of the invention is realized in such a way that the preparation method of the chitin-chitosan nano composite fiber comprises the following steps:
placing the chitin nanofibrils in water for homogenization treatment to obtain chitin aqueous suspension;
adding chitosan powder into the chitin aqueous suspension, and uniformly mixing to obtain a mixed solution;
adding an acetic acid aqueous solution into the mixed solution, and uniformly mixing to obtain a spinning solution;
filtering and degassing the spinning stock solution, and then placing the spinning stock solution in a precipitator for coagulating bath and stretching treatment to obtain the chitin-chitosan nano composite fiber; the precipitant includes ethanol and NaOH solution.
As a preferable scheme of the embodiment of the present invention, the mass of the chitin nanofibrils is 0.05% to 20% of the mass of the chitosan powder.
As another preferable scheme of the embodiment of the present invention, the mass of the chitin nanofibrils is 0.1% to 0.3% of the mass of the chitosan powder.
As another preferable scheme of the embodiment of the present invention, in the mixed solution, the total mass concentration of the chitosan powder and the chitosan nanofibrils is 2% to 6%.
In another preferable embodiment of the present invention, the mass concentration of acetic acid in the aqueous acetic acid solution is 1% to 3%.
As another preferable scheme of the embodiment of the invention, in the precipitator, the volume ratio of ethanol to NaOH solution is 1 (0.8-1.2).
In another preferable embodiment of the present invention, the mass concentration of NaOH in the NaOH solution is 8% to 12%.
The other purpose of the embodiment of the invention is to provide the chitin-chitosan nano composite fiber prepared by the preparation method.
As another preferred scheme of the embodiment of the invention, the tensile strength of the chitin-chitosan nano composite fiber is not lower than 250MPa, and the Young modulus is not lower than 1.2 GPa.
Another object of the embodiments of the present invention is to provide an application of the chitosan-chitosan nanocomposite fiber in textile materials and/or biomedical materials and/or aerospace manned closed cabin materials.
The biomedical materials include, but are not limited to, hemostatic tapes, surgical sutures, and the like.
According to the preparation method of the chitin-chitosan nano composite fiber provided by the embodiment of the invention, the chitin nano fibrils are used as a reinforcing material, the chitosan derivative thereof is used as a matrix material, and the chitin/chitosan nano composite fiber is prepared by a wet textile process, so that the chitin/chitosan nano composite fiber with an ordered structure, which has the advantages of high strength, high rigidity, biodegradability, no cytotoxicity and eco-friendliness, can be obtained. The preparation method adopts the technical principle that the orientation of the nano-fibers is realized by utilizing the rheology theory so as to obtain the nano-composite fibers with ordered structures, the ordered structures can endow the nano-composite fibers with enough strength and rigidity modulus, and the nano-composite fibers have excellent biomedical functions and excellent moisture absorption and heat preservation functions, so that the chitin-chitosan nano-composite fibers can be applied to the fields of biology and medicine (wound healing and repair of aorta), the textile and clothing industry and aerospace manned closed cabins.
Drawings
Fig. 1 is a process flow diagram of a preparation method of a chitin-chitosan nanocomposite fiber provided by an embodiment of the present invention.
In fig. 1: 1-dissolving tank, 2-first filter, 3-screw pump, 4-defoaming tank, 5-vacuum pump, 6-air compressor, 7-second filter, 8-metering pump, 9-third filter, 10-spinning nozzle, 11-solidifying bath, 12-first water-washing bath, 13-second water-washing bath and 14-winding roller.
Fig. 2 is an electron microscope image of the chitin-chitosan nanocomposite fiber prepared in example 1 of the present invention.
Fig. 3 is a scanning electron microscope image of an oriented structure of the chitin-chitosan nanocomposite fiber prepared in example 1 of the present invention.
Fig. 4 is an electron microscope image of the aortic part material being the chitin-chitosan nanocomposite fiber prepared in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in fig. 1, the embodiment provides a method for preparing a chitin-chitosan nanocomposite fiber, which comprises the following steps:
s1, placing the chitin nanofibrils and water in a dissolving tank 1, and homogenizing for 30min by ultrasonic waves with the frequency of 40kHz and the average power of 45W to obtain the chitin water suspension.
S2, adding the chitosan powder into the chitin water suspension, and uniformly mixing to obtain a mixed solution with the total mass concentration of the chitosan powder and the chitin nanofibrils being 4%. Wherein the mass of the chitin nanofibrils is 0.2 percent of the mass of the chitosan powder.
And S3, stirring the mixed solution for 30 minutes at room temperature until the chitosan is partially dissolved and swelled, and adding an acetic acid aqueous solution with the mass concentration of 2% into the mixed solution during continuous stirring to uniformly mix so as to adjust the pH of the mixed solution to 4.5, thereby obtaining a spinning solution.
And S4, feeding the spinning solution into a first filter 2 for filtration, then feeding the spinning solution into a defoaming tank 4 through a screw pump 3, and then regulating the pressure through a vacuum pump 5 and an air compressor 6 to ensure that the spinning solution is degassed for 24 hours under the pressure of 0.1 atm.
S5, feeding the degassed spinning solution into a second filter 7 for filtering, feeding the spinning solution into a third filter 9 for filtering through a metering pump 8, and ejecting the filtered spinning solution from a die hole with the diameter of 0.6mm at a spinning nozzle 10 into a coagulating bath 11 containing a precipitator for coagulating bath treatment to form nascent fibers; then, the nascent fiber is subjected to drawing treatment by a drawing roller and is sequentially sent to a first washing bath 12 and a first washing bath 13 containing distilled water for washing; then, the washed nascent fiber is dehydrated and dried at 50 ℃, and then is wound by a winding roller 14, so that the chitin-chitosan nano composite fiber can be obtained. Wherein the precipitator is prepared by mixing ethanol and NaOH solution with the mass concentration of 10% according to the volume ratio of 1:1. In addition, the rate of die feed was 5.5mm/s, the time to precipitation was 150s, and the filament orientation draw (A) factor in the coagulation bath varied from-40% (shrinkage) to + 120%.
Example 2
As shown in fig. 1, the embodiment provides a method for preparing a chitin-chitosan nanocomposite fiber, which comprises the following steps:
s1, placing the chitin nanofibrils and water in a dissolving tank 1, and homogenizing for 30min by ultrasonic waves with the frequency of 40kHz and the average power of 45W to obtain the chitin water suspension.
S2, adding the chitosan powder into the chitin water suspension, and uniformly mixing to obtain a mixed solution with the total mass concentration of the chitosan powder and the chitin nanofibrils being 2%. Wherein the mass of the chitin nanofibrils is 0.05 percent of the mass of the chitosan powder.
And S3, stirring the mixed solution for 30 minutes at room temperature until the chitosan is partially dissolved and swelled, and adding 1% acetic acid aqueous solution into the mixed solution during continuous stirring to uniformly mix so as to adjust the pH of the mixed solution to 4, thereby obtaining the spinning solution.
And S4, feeding the spinning solution into a first filter 2 for filtration, then feeding the spinning solution into a defoaming tank 4 through a screw pump 3, and then regulating the pressure through a vacuum pump 5 and an air compressor 6 to ensure that the spinning solution is degassed for 24 hours under the pressure of 0.1 atm.
S5, feeding the degassed spinning solution into a second filter 7 for filtering, feeding the spinning solution into a third filter 9 for filtering through a metering pump 8, and ejecting the filtered spinning solution from a die hole with the diameter of 0.6mm at a spinning nozzle 10 into a coagulating bath 11 containing a precipitator for coagulating bath treatment to form nascent fibers; then, the nascent fiber is subjected to drawing treatment by a drawing roller and is sequentially sent to a first washing bath 12 and a first washing bath 13 containing distilled water for washing; then, the washed nascent fiber is dehydrated and dried at 50 ℃, and then is wound by a winding roller 14, so that the chitin-chitosan nano composite fiber can be obtained. Wherein the precipitator is prepared by mixing ethanol and 8% NaOH solution according to the volume ratio of 1: 0.8. In addition, the rate of die feed was 5.5mm/s, the time to precipitation was 150s, and the filament orientation draw (A) factor in the coagulation bath varied from-40% (shrinkage) to + 120%.
Example 3
As shown in fig. 1, the embodiment provides a method for preparing a chitin-chitosan nanocomposite fiber, which comprises the following steps:
s1, placing the chitin nanofibrils and water in a dissolving tank 1, and homogenizing for 30min by ultrasonic waves with the frequency of 40kHz and the average power of 45W to obtain the chitin water suspension.
S2, adding the chitosan powder into the chitin water suspension, and uniformly mixing to obtain a mixed solution with the total mass concentration of the chitosan powder and the chitin nanofibrils being 6%. Wherein the mass of the chitin nanofibrils is 20% of the mass of the chitosan powder.
And S3, stirring the mixed solution for 30 minutes at room temperature until the chitosan is partially dissolved and swelled, and adding an acetic acid aqueous solution with the mass concentration of 3% into the mixed solution during continuous stirring to uniformly mix so as to adjust the pH of the mixed solution to 5, thereby obtaining a spinning solution.
And S4, feeding the spinning solution into a first filter 2 for filtration, then feeding the spinning solution into a defoaming tank 4 through a screw pump 3, and then regulating the pressure through a vacuum pump 5 and an air compressor 6 to ensure that the spinning solution is degassed for 24 hours under the pressure of 0.1 atm.
S5, feeding the degassed spinning solution into a second filter 7 for filtering, feeding the spinning solution into a third filter 9 for filtering through a metering pump 8, and ejecting the filtered spinning solution from a die hole with the diameter of 0.6mm at a spinning nozzle 10 into a coagulating bath 11 containing a precipitator for coagulating bath treatment to form nascent fibers; then, the nascent fiber is subjected to drawing treatment by a drawing roller and is sequentially sent to a first washing bath 12 and a first washing bath 13 containing distilled water for washing; then, the washed nascent fiber is dehydrated and dried at 50 ℃, and then is wound by a winding roller 14, so that the chitin-chitosan nano composite fiber can be obtained. Wherein the precipitator is prepared by mixing ethanol and NaOH solution with the mass concentration of 12% according to the volume ratio of 1: 1.2. In addition, the rate of die feed was 5.5mm/s, the time to precipitation was 150s, and the filament orientation draw (A) factor in the coagulation bath varied from-40% (shrinkage) to + 120%.
Example 4
As shown in fig. 1, the embodiment provides a method for preparing a chitin-chitosan nanocomposite fiber, which comprises the following steps:
s1, placing the chitin nanofibrils and water in a dissolving tank 1, and homogenizing for 30min by ultrasonic waves with the frequency of 40kHz and the average power of 45W to obtain the chitin water suspension.
S2, adding the chitosan powder into the chitin water suspension, and uniformly mixing to obtain a mixed solution with the total mass concentration of the chitosan powder and the chitin nanofibrils being 3%. Wherein the mass of the chitin nanofibrils is 0.1 percent of the mass of the chitosan powder.
And S3, stirring the mixed solution for 30 minutes at room temperature until the chitosan is partially dissolved and swelled, and adding an acetic acid aqueous solution with the mass concentration of 2% into the mixed solution during continuous stirring to uniformly mix so as to adjust the pH of the mixed solution to 4.5, thereby obtaining a spinning solution.
And S4, feeding the spinning solution into a first filter 2 for filtration, then feeding the spinning solution into a defoaming tank 4 through a screw pump 3, and then regulating the pressure through a vacuum pump 5 and an air compressor 6 to ensure that the spinning solution is degassed for 24 hours under the pressure of 0.1 atm.
S5, feeding the degassed spinning solution into a second filter 7 for filtering, feeding the spinning solution into a third filter 9 for filtering through a metering pump 8, and ejecting the filtered spinning solution from a die hole with the diameter of 0.6mm at a spinning nozzle 10 into a coagulating bath 11 containing a precipitator for coagulating bath treatment to form nascent fibers; then, the nascent fiber is subjected to drawing treatment by a drawing roller and is sequentially sent to a first washing bath 12 and a first washing bath 13 containing distilled water for washing; then, the washed nascent fiber is dehydrated and dried at 50 ℃, and then is wound by a winding roller 14, so that the chitin-chitosan nano composite fiber can be obtained. Wherein the precipitator is prepared by mixing ethanol and NaOH solution with the mass concentration of 9% according to the volume ratio of 1: 1.1. In addition, the rate of die feed was 5.5mm/s, the time to precipitation was 150s, and the filament orientation draw (A) factor in the coagulation bath varied from-40% (shrinkage) to + 120%.
Example 5
As shown in fig. 1, the embodiment provides a method for preparing a chitin-chitosan nanocomposite fiber, which comprises the following steps:
s1, placing the chitin nanofibrils and water in a dissolving tank 1, and homogenizing for 30min by ultrasonic waves with the frequency of 40kHz and the average power of 45W to obtain the chitin water suspension.
S2, adding the chitosan powder into the chitin water suspension, and uniformly mixing to obtain a mixed solution with the total mass concentration of the chitosan powder and the chitin nanofibrils being 5%. Wherein the mass of the chitin nanofibrils is 0.3 percent of the mass of the chitosan powder.
And S3, stirring the mixed solution for 30 minutes at room temperature until the chitosan is partially dissolved and swelled, and adding an acetic acid aqueous solution with the mass concentration of 2% into the mixed solution during continuous stirring to uniformly mix so as to adjust the pH of the mixed solution to 4.5, thereby obtaining a spinning solution.
And S4, feeding the spinning solution into a first filter 2 for filtration, then feeding the spinning solution into a defoaming tank 4 through a screw pump 3, and then regulating the pressure through a vacuum pump 5 and an air compressor 6 to ensure that the spinning solution is degassed for 24 hours under the pressure of 0.1 atm.
S5, feeding the degassed spinning solution into a second filter 7 for filtering, feeding the spinning solution into a third filter 9 for filtering through a metering pump 8, and ejecting the filtered spinning solution from a die hole with the diameter of 0.6mm at a spinning nozzle 10 into a coagulating bath 11 containing a precipitator for coagulating bath treatment to form nascent fibers; then, the nascent fiber is subjected to drawing treatment by a drawing roller and is sequentially sent to a first washing bath 12 and a first washing bath 13 containing distilled water for washing; then, the washed nascent fiber is dehydrated and dried at 50 ℃, and then is wound by a winding roller 14, so that the chitin-chitosan nano composite fiber can be obtained. Wherein the precipitator is prepared by mixing ethanol and NaOH solution with the mass concentration of 11% according to the volume ratio of 1: 0.9. In addition, the rate of die feed was 5.5mm/s, the time to precipitation was 150s, and the filament orientation draw (A) factor in the coagulation bath varied from-40% (shrinkage) to + 120%.
Experimental example:
firstly, the tensile strength and the Young's modulus of the chitin-chitosan nano composite fiber prepared in the embodiment 1 are measured, the tensile strength exceeds 250MPa, and the Young's modulus reaches 1.2 GPa.
Secondly, the structure and orientation of the chitin-chitosan nanocomposite fiber prepared in the above example 1 are observed by a scanning electron microscope (SEM, Supra-55 VP, Carl Zeiss), and the observation results are respectively shown in fig. 2 to 3.
Fig. 2 shows that the surface of the chitin-chitosan nanocomposite fiber prepared in example 1 above is smooth and free of defects, and the cross section of the fiber is also dense, and large pores or cracks are not detected. In addition, the non-linear character of the dependence of the chitosan/chitin solution viscosity on shear rate is caused by the orientation of the chitosan macromolecules and chitin nanofibers. Fig. 3 shows that the introduction of chitosan nanofibers into chitosan matrix is helpful to the orientation of chitosan macromolecules, so that the strength and young's modulus of the chitosan-chitosan nanofibers can be improved.
In addition, the chitin-chitosan nanocomposite fiber prepared in the above example 1 is applied to aortic repair, and an electron microscope image after repair is shown in fig. 4.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A preparation method of chitin-chitosan nano composite fiber is characterized by comprising the following steps:
placing the chitin nanofibrils in water for homogenization treatment to obtain chitin aqueous suspension;
adding chitosan powder into the chitin aqueous suspension, and uniformly mixing to obtain a mixed solution;
adding an acetic acid aqueous solution into the mixed solution, and uniformly mixing to obtain a spinning solution;
filtering and degassing the spinning stock solution, and then placing the spinning stock solution in a precipitator for coagulating bath and stretching treatment to obtain the chitin-chitosan nano composite fiber; the precipitant includes ethanol and NaOH solution.
2. The method for preparing the chitin-chitosan nanocomposite fiber according to claim 1, wherein the mass of the chitin nanofibrils is 0.05% to 20% of the mass of the chitosan powder.
3. The method of claim 2, wherein the mass of the chitosan nanofibrils is 0.1-0.3% of the mass of the chitosan powder.
4. The method for preparing chitin-chitosan nano-composite fiber according to claim 1, wherein the total mass concentration of chitosan powder and chitin nanofibrils in the mixed solution is 2% -6%.
5. The method for preparing the chitin-chitosan nano composite fiber according to claim 1, wherein the mass concentration of acetic acid in the acetic acid aqueous solution is 1-3%.
6. The method for preparing the chitin-chitosan nano composite fiber according to claim 1, wherein the volume ratio of ethanol to NaOH solution in the precipitant is 1 (0.8-1.2).
7. The method for preparing the chitin-chitosan nano composite fiber according to claim 1 or 6, wherein the mass concentration of NaOH in the NaOH solution is 8-12%.
8. The chitin-chitosan nanocomposite fiber prepared by the preparation method according to any one of claims 1 to 7.
9. The chitin-chitosan nanocomposite fiber according to claim 8, wherein the tensile strength of the chitin-chitosan nanocomposite fiber is not less than 250MPa, and the Young's modulus is not less than 1.2 GPa.
10. Use of the chitin-chitosan nanocomposite fiber according to claim 8 or 9 as a textile material and/or a biomedical material and/or an aerospace manned closed cabin material.
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| CN109942897A (en) * | 2019-04-04 | 2019-06-28 | 西南林业大学 | A kind of preparation of environment-protection low-consumption type nano-chitosan-chitosan-fibrillation cellulose composite material |
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