Antibacterial-type nanofiber-based preservative film and preparation method thereof

A nanofiber and nanocellulose technology, which is applied in the field of degradable composite material preparation, can solve the problems of limited application range, chemical corrosion resistance, poor air permeability, etc., and achieve the effect of strong safety, high antibacterial efficiency and less components

Inactive Publication Date: 2016-04-20
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a natural polymer compound, cellulose has some disadvantages in performance, such as no resistance to chemical corrosion, limited strength, poor air permeability, low transparency, etc.
These physical forms also limit its range of applications
For example, researchers such as Ma Hao of Jinan University used ordinary cellulose and chitosan as the main raw materials to prepare composite films [article num

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1 Preparation of an antibacterial nanofiber-based fresh-keeping film

[0025] An antibacterial nanofiber-based fresh-keeping film whose main components are (calculated by mass percentage): microfibrillated cellulose (MFC) 75%-85%, chitosan 15%-25%.

[0026] An antibacterial nanofiber-based fresh-keeping film, the preparation method of the fresh-keeping film is:

[0027] (1) After the microfibrillated nano cellulose (MFC) raw material is magnetically stirred for 10-20 minutes, it is ultrasonically shaken and dispersed for 2.5-4.0 hours;

[0028] (2) Dissolve the chitosan raw material with 3.5%-5.0% acetic acid aqueous solution, and prepare a mass fraction of 4.5%-5% chitosan acetic acid aqueous solution;

[0029] (3) Mix the dispersed microfibrillated nano cellulose (MFC) raw material with the chitosan acetic acid aqueous solution in a mass ratio of 3:1, 4:1, 5:1, magnetically stir for 5-10min, then ultrasonically shake to disperse 2-3h;

[0030] (4) Leave the blended liqu...

Example Embodiment

[0033] Example 2 Antibacterial effect of an antibacterial nanofiber-based fresh-keeping film

[0034] Taking an antibacterial nanofiber-based fresh-keeping film prepared in Example 1 as an object, the antibacterial effect of the film was measured.

[0035] Antibacterial test of film: Antibacterial is one of the advantages of an antibacterial nanofiber-based fresh-keeping film. Staphylococcus aureus was used for antibacterial testing. The antibacterial rates of A1, A2, and A3 films were 89.9% and 99.7, respectively. %, 90.4%, and the average value is 93.3%. The antibacterial data shows that the antibacterial type of the cellulose film is obviously improved by using nanocellulose as the base material.

Example Embodiment

[0036] Example 3 Elongation at break of an antibacterial nanofiber-based fresh-keeping film

[0037] Taking an antibacterial nanofiber-based fresh-keeping film prepared in Example 1 as an object, the elongation at break of the film was measured.

[0038] Test of elongation at break of film: elongation at break is an important parameter that reflects the mechanical properties of the cling film. The measurement method is based on the industry standard GB1040-79, using the antibacterial nanofiber-based cling film of the present invention for elongation at break Rate test. The test results show that the elongation at break A1, A2, and A3 of the film prepared by the present invention are 108 MPa, 155 MPa, and 148 MPa, respectively, and the average value is 137 MPa, indicating that the film prepared by the present invention has good physical and mechanical properties.

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Abstract

The invention discloses an antibacterial-type nanofiber-based preservative film and a preparation method thereof. The novel antibacterial-type nanofiber-based preservative film which has the excellent mechanical property, can be completely degraded and completely meets the physical performance requirements of preservative films is prepared by taking micro-fibrillated nanocellulose (MFC) and chitosan as raw materials; the preservative film is prepared mainly through the step that ultrasonic blending is performed on the micro-fibrillated nanocellulose (MFC) and an aqueous acetic acid solution of chitosan under the appropriate proportion condition. Compared with a food preservation material on the market, the antibacterial-type nanofiber-based preservative film has the advantages that the production technology is simple, and the preparation cost is low; the preservative film also has the advantages of being efficient, antibacterial, high in air permeability, transparency, bonding property, skin film flexibility and wear resistance and the like, is a new-generation green and environment-friendly type preservative film for replacing an existing plastic preservative film, can serve as a material for packaging food and has the wide application prospect in the field of food packaging films.

Description

technical field [0001] The invention belongs to the field of preparation of degradable composite materials, and in particular relates to an antibacterial nanofiber-based fresh-keeping film and a preparation method. Background technique [0002] In recent years, people pay more and more attention to food safety, and people try to reduce food safety hazards in various ways. As one of the important members in the field of food circulation, food packaging materials not only have the advantages of beautiful products and easy storage, but also have the effect of keeping fresh and prolonging the aging period, which promotes the research in the field of food packaging films. The safety and functionality of food cling film has become one of the research hotspots. [0003] Statistics show that the food discarded due to rot in the world every year far exceeds the sum of the food provided by the United Nations to poor countries. The growth and reproduction of microorganisms is an impo...

Claims

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Application Information

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IPC IPC(8): C08L1/02C08L5/08C08J5/18B65D65/46
CPCB65D65/466C08J5/18C08J2301/02C08J2405/08C08L1/02C08L2201/06C08L2201/10C08L2203/16C08L5/08
Inventor 李群周文琴
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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