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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  • 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 par

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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

Examples

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Example Embodiment

[0034] The present invention provides a preparation method of nanofiber chitosan porous material, including the following steps:

[0035] S1. Dissolve chitosan in an aqueous acetic acid solution to prepare a chitosan solution and defoam for use;

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

[0037] S3. After the nanofiber suspension prepared in step S2 and the chitosan solution prepared in step S1 are blended and stirred 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 nanofiber is prepared by the follow...

Example Embodiment

[0049] Example 1

[0050] This embodiment provides a method for preparing nanofiber chitosan porous material, including the following steps:

[0051] S1. Dissolve 2 g of chitosan in 100 mL of 1% acetic acid aqueous solution to prepare a chitosan solution, and defoam for use;

[0052] S2. 2g of polyvinyl alcohol-ethylene copolymer nanofibers are uniformly dispersed in a solvent mixed with water and isopropanol with a mass ratio of 1:1, and broken at high speed to prepare a nanofiber suspension; The mass percentage of the 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. The polyvinyl alcohol-ethylene copolymer and cellulose acetate butyrate are uniformly mixed in a mass ratio of 1:4, and the composite fiber is prepared after melt extrusion and drawing by a twin-screw extruder at a processing temperature of 170°C;

[0055] S22. Put the composi...

Example

[0060] Examples 2 to 5 and Comparative Examples 1 to 2

[0061] Examples 2 to 5 and Comparative Example 1 respectively provide a preparation method of nanofiber chitosan porous material. Compared with Example 1, the difference is that the nanofiber suspension and the chitosan solution in step S3 are changed. The 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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