High-barrier antibacterial composite film based on nano cellulose/MXene immobilized nano silver as well as preparation method and application thereof

A technology of nano-cellulose and nano-silver, which is applied in the field of food packaging materials, can solve the problems of cumulative toxicity and achieve good antibacterial effect, stable performance and excellent mechanical properties

Active Publication Date: 2021-04-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although nano-silver can inhibit and kill dozens of microorganisms such as Escherichia coli and Staphylococcus aureus, and will not produce drug resistance, some studies have shown that in practical applications, excessive nano-silver will have harmful effects on the human body, ecology and environment. The environment produces certain cumulative toxicity

Method used

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  • High-barrier antibacterial composite film based on nano cellulose/MXene immobilized nano silver as well as preparation method and application thereof
  • High-barrier antibacterial composite film based on nano cellulose/MXene immobilized nano silver as well as preparation method and application thereof
  • High-barrier antibacterial composite film based on nano cellulose/MXene immobilized nano silver as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] The preparation of nano-cellulose / MXene immobilized nano-silver high-barrier antibacterial composite film, the specific steps are as follows:

[0036] (1) Using the MXene solution obtained by HCL / LiF stripping, add 1 mL of silver ammonia solution with a concentration of 0.05 mol / L to 50 mL of 0.1 g / L MXene solution under stirring, and mix well to obtain a mixed solution;

[0037](2) Under room temperature conditions, in the mixed solution that step (1) obtains, add the tea polyphenol solution that concentration is 1g / L, obtain reaction solution, tea polyphenol solution is 5% with respect to the total fraction of reaction solution , continue to react for 5 minutes, dialyze the obtained MXene-immobilized nano-silver complex to no silver ion, and obtain MXene-immobilized nano-silver composite antibacterial agent;

[0038] (3) preparation mass fraction is 0.1% nano-cellulose solution (the diameter of nano-cellulose < 15nm), adds glycerol (plasticizer) wherein under stirring...

Embodiment 2

[0045] The preparation of nano-cellulose / MXene immobilized nano-silver high-barrier antibacterial composite film, the specific steps are as follows:

[0046] (1) Using the MXene solution obtained by HCL / LiF stripping, add 7.5 mL of silver ammonia solution with a concentration of 0.4 mol / L to 50 mL of MXene solution with a concentration of 0.9 g / L under stirring, and mix well to obtain a mixed solution;

[0047] (2) Under room temperature conditions, in the mixed solution that step (1) obtains, add the tea polyphenol solution that concentration is 10g / L, obtain reaction solution, the tea polyphenol solution is 7.5% with respect to the total fraction of reaction solution , continue to react for 30 minutes, dialyze the obtained MXene-immobilized nano-silver complex until no silver ions are detected, and obtain nano-cellulose-immobilized nano-silver composite antibacterial agent;

[0048] (3) preparation mass fraction is 2% nano-cellulose solution (the diameter of nano-cellulose <...

Embodiment 3

[0055] The preparation of nano-cellulose / MXene immobilized nano-silver high-barrier antibacterial composite film, the specific steps are as follows:

[0056] (1) Use the MXene solution obtained by HCL / LiF stripping, add 30 mL of silver ammonia solution with a concentration of 2.5 mol / L to 50 mL of 2 g / L MXene solution under stirring, and mix well to obtain a mixed solution;

[0057] (2) Under room temperature conditions, in the mixed solution that step (1) obtains, add the tea polyphenol solution that concentration is 30g / L, obtain reaction solution, tea polyphenol solution is 12% with respect to the total fraction of reaction solution , continue to react for 45 minutes, dialyze the obtained MXene-immobilized nano-silver complex until no silver ions are detected, and obtain the MXene-immobilized nano-silver composite antibacterial agent;

[0058] (3) preparation mass fraction is 4% nano-cellulose solution (the diameter of nano-cellulose < 15nm), adds glycerin (plasticizer) whe...

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Abstract

The invention discloses a high-barrier antibacterial composite film based on nano cellulose / MXene immobilized nano silver and a preparation method thereof. The method comprises the following steps: adopting tea polyphenol as a reducing agent to prepare nano silver, taking MXene as a template to fix nano silver, and preparing the MXene immobilized nano silver composite antibacterial agent; and adding the MXene immobilized nano silver composite antibacterial agent into nano cellulose, and taking glycerol as a plasticizer to obtain the nano cellulose / MXene immobilized nano silver composite film. The oxygen permeability of the composite film is only 0.04 cm<3> / m<2>. 24h. 0.1 MPa and is far lower than that of a common PE preservative film (48.59 cm<3> / m<2>. 24h. 0.1 MPa, the reference standard is GB / T 1038), and the composite film has a high barrier property; and the composite film has an antibacterial performance, can effectively inhibit the growth of pathogenic bacteria, prolongs the shelf life of food, and meets the requirements of modern food active packaging.

Description

technical field [0001] The invention relates to the field of food packaging materials, in particular to a high-barrier antibacterial composite film based on nano-cellulose / MXene immobilized nano-silver and its preparation method and application. Background technique [0002] Food is easily damaged by light, moisture, oxygen and microorganisms during storage and transportation, resulting in shortened shelf life and reduced food quality. High barrier packaging film can effectively block oxygen, moisture, light, etc., and can effectively protect the quality of the packaged goods and prolong their shelf life. In recent years, the most widely used high-barrier packaging film materials are mainly synthetic plastics derived from fossil fuel resources. Although these plastics have low cost, good processability and mechanical properties, and strong barrier properties, their widespread use has caused serious environmental pollution and the depletion of fossil fuel resources. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08K9/02C08K3/08C08K5/053C08J5/18
CPCY02W90/10
Inventor 王小英唐淑玮吴正国
Owner SOUTH CHINA UNIV OF TECH
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