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Nanofiber chitosan porous material and preparation method thereof

A technology of nanofibers and porous materials, applied in the field of porous materials, can solve the problems of difficult to obtain porous materials with comprehensive properties, difficult to achieve nanofiber reinforced scaffold structure, limited effect, etc., and achieve suitable hot water dissolution rate, excellent hydrophilicity, Improve the effect of low intensity

Active Publication Date: 2020-04-10
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is mainly to improve the mechanical properties of porous materials, and has little effect on the properties of porous materials such as dissolution rate, swelling rate, and water content, and it is still difficult to obtain porous materials with better comprehensive properties; Composite particles and chitosan, its nanoparticles can only adhere to the inner wall of the hole in a point-like manner, which has a limited effect compared with nanofibers, and it is difficult to achieve the excellent effect of nanofibers in strengthening the scaffold structure. Related studies on the compounding of glycans

Method used

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  • Nanofiber chitosan porous material and preparation method thereof
  • Nanofiber chitosan porous material and preparation method thereof
  • Nanofiber chitosan porous material and preparation method thereof

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preparation example Construction

[0034] The invention provides a kind of preparation method of nanofiber chitosan porous material, comprises the steps:

[0035] S1, dissolving chitosan in an aqueous acetic acid solution to prepare a chitosan solution, and defoaming for subsequent use;

[0036] S2. Uniformly dispersing polyvinyl alcohol-ethylene copolymer nanofibers in a solvent to prepare a nanofiber suspension;

[0037] S3. After blending and stirring the nanofiber suspension prepared in step S2 and the chitosan solution prepared in step S1 according to a preset volume ratio, ultrasonic dispersion is performed to obtain a nanofiber chitosan solution;

[0038] S4. Freeze-drying the nanofiber chitosan solution prepared in step S3 to obtain a nanofiber chitosan porous material.

[0039] In step S1, the volume fraction of acetic acid in the acetic acid aqueous solution is 1%; the concentration of the chitosan solution is 10-30 mg / mL.

[0040] In step S2, the polyvinyl alcohol-ethylene copolymer nanofibers are ...

Embodiment 1

[0050] The present embodiment provides a kind of preparation method of nanofiber chitosan porous material, comprises the steps:

[0051] S1, dissolving 2g of chitosan in 100mL of acetic acid aqueous solution with a volume fraction of 1%, prepares a chitosan solution, and defoams it for subsequent use;

[0052] S2. Uniformly disperse 2g of polyvinyl alcohol-ethylene copolymer nanofibers in a solvent mixed with water and isopropanol with a mass ratio of 1:1, and break them at high speed to prepare a nanofiber suspension; the nanofibers The mass percentage of polyvinyl alcohol-ethylene copolymer nanofibers in the fiber suspension is 2%;

[0053] Wherein, the polyvinyl alcohol-ethylene copolymer nanofiber is prepared by the following steps:

[0054] S21. Mix polyvinyl alcohol-ethylene copolymer and cellulose acetate butyrate evenly in a mass ratio of 1:4, melt extrude from a twin-screw extruder at a processing temperature of 170°C, and prepare composite fibers after drawing;

[...

Embodiment 2～5 and comparative example 1～2

[0061] Embodiment 2~5 and comparative example 1 provide a kind of preparation method of nanofiber chitosan porous material respectively, compared with embodiment 1, the difference lies in changing the nanofiber suspension and chitosan solution in step S3 volume ratio.

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Abstract

The invention discloses a nanofiber chitosan porous material and a preparation method thereof. The preparation method comprises the following steps: respectively preparing a chitosan solution and a polyvinyl alcohol-ethylene copolymer nanofiber suspension, uniformly mixing the chitosan solution and the polyvinyl alcohol-ethylene copolymer nanofiber suspension in proportion and freeze-drying to obtain the nanofiber chitosan porous material. With application of the method, the polyvinyl alcohol-ethylene copolymer nanofibers can be uniformly dispersed on the surface of the inner wall of the chitosan body, the problems that the traditional chitosan porous material is low in strength, prone to dissolution loss, short in service life and the like are solved, and the prepared porous material hasthe appropriate hot water dissolution loss rate, swelling rate, moisture content and compression strength so as to meet the requirements of practical application. The preparation method of the nanofiber chitosan porous material is simple and easy to implement and can meet industrial large-scale production; and the performance of the prepared porous material can be regulated and controlled by adjusting the ratio of the nanofibers to the chitosan so as to adapt to different application scenes, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of porous materials, in particular to a nanofiber chitosan porous material and a preparation method thereof. Background technique [0002] Porous material is a kind of material with a network structure composed of interconnected or closed pores. It generally has the advantages of low relative density, high specific strength, high specific surface area, light weight, sound insulation, heat insulation, and good permeability. It is an excellent material. new functional structural materials. The excellent mechanical properties, transmission properties, photoelectric properties, permeability, adsorption and chemical properties of porous materials make them widely used in aerospace, electronic communication, transportation, biomedical, environmental protection, machinery manufacturing, electromagnetic shielding, petrochemical and other fields. It has been widely used and plays an important role in science and tec...

Claims

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Application Information

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IPC IPC(8): C08L5/08C08L29/04C08J9/28
CPCC08J9/28C08J9/0061C08J2305/08C08J2429/04C08J2201/048
Inventor 王栋尤海宁赵青华梅涛毛秦岑宋银红吴建美蒋海青
Owner WUHAN TEXTILE UNIV
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