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 number 1004-8405 (2010) 02-0033-06], which have poor antibacterial properties, low transparency, and weak air permeability. , no adhesion and other problems, its physical properties are far from meeting the performance requirements of the national standard plastic wrap, but if it is prepared into nanomaterials, its performance can be largely optimized, making this renewable resource more wide range of applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 prepares a kind of antibacterial nanofiber base preservative film

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

[0026] A kind of antibacterial nanofiber base preservative film, the preparation method of this preservative film is:

[0027] (1) After the raw material of microfibrillated nanocellulose (MFC) is stirred by magnetic force for 10-20 minutes, it is dispersed by ultrasonic vibration for 2.5-4.0 hours;

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

[0029] (3) Mix the dispersed microfibrillated nanocellulose (MFC) raw material with the chitosan acetic acid aqueous solution at a mass ratio of 3:1, 4:1, and 5:1, stir magnetically for 5-10 minutes, and disperse by ultrasonic...

Embodiment 2

[0033] The bacteriostasis effect of embodiment 2 a kind of antibacterial nanofiber base preservative film

[0034] Taking an antibacterial nanofiber-based plastic wrap prepared in Example 1 as an object, the antibacterial effect of the film was determined.

[0035]Antibacterial type test of film: Antibacterial type is one of the advantages of the invention of antibacterial nanofiber-based plastic wrap. Staphylococcus aureus was used for antibacterial test, and 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 show that the antibacterial type of the cellulose film is obviously improved by using nanocellulose as the base material.

Embodiment 3

[0036] Example 3 The elongation at break of a kind of antibacterial nanofiber-based plastic wrap

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

[0038] The test of the elongation at break of the film: the elongation at break is an important parameter reflecting the mechanical properties of the fresh-keeping film, and the measuring method is according to the industry standard GB1040-79, applying a kind of antibacterial nanofiber base fresh-keeping film of the present invention to carry out the 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 108MPa, 155MPa and 148MPa respectively, with an average value of 137MPa, 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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