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Plant nanocellulose-based flexible electromagnetic shielding film as well as preparation method and application thereof

A technology of nanocellulose and electromagnetic shielding film, which is applied in the field of plant nanocellulose-based flexible electromagnetic shielding film and its preparation, can solve the problems of uneven dispersion of graphene, non-environmental protection of reducing agents, etc., and achieve good conductivity and good antibacterial effect, the effect of prolonging the service life

Inactive Publication Date: 2018-06-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the disadvantages and deficiencies of the above prior art that the reducing agent is not environmentally friendly and the graphene is not uniformly dispersed, the primary purpose of the present invention is to provide a method for preparing a plant nanocellulose-based flexible electromagnetic shielding film

Method used

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  • Plant nanocellulose-based flexible electromagnetic shielding film as well as preparation method and application thereof
  • Plant nanocellulose-based flexible electromagnetic shielding film as well as preparation method and application thereof
  • Plant nanocellulose-based flexible electromagnetic shielding film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Adopt Hummers method to prepare graphene oxide, after drying, dispersing, be dissolved in deionized water to obtain 400mL of 2.0mg / mL graphene oxide dispersion liquid; Wherein the prepared graphene oxide monolayer rate is 70%~80% , the sheet diameter is 100nm~200nm, and the single layer thickness is 0.8nm~1.0nm;

[0042](2) Add 10mg of nano-silver (the particle size of nano-silver is 25-50nm) into 25mL of the above-mentioned graphene oxide dispersion and stir for 1h (300-350r / min) to obtain a uniformly dispersed nano-silver-graphene oxide dispersion liquid;

[0043] (3) adding all the nanometer silver-graphene oxide dispersion liquid that step (2) obtains to 1000g mass fraction is in the nanocellulose dispersion liquid of 0.1% and stirs 2~3h (300~350r / min), obtains the evenly dispersed Nano silver-graphene oxide-nanocellulose dispersion;

[0044] (4) Vibrate all the dispersion liquid obtained in step (3) for 40min under 400w ultrasonic conditions, and form a film ...

Embodiment 2

[0051] (1) Adopt Hummers method to prepare graphene oxide, after drying, dispersing, be dissolved in deionized water to obtain 400mL of 1.0mg / mL graphene oxide dispersion liquid; Wherein the prepared graphene oxide monolayer rate is 70%~80% , the sheet diameter is 100nm~200nm, and the single layer thickness is 0.8nm~1.0nm;

[0052] (2) Add 1 mg nano silver (the particle size of nano silver is 25-50 nm) to 100 mL of the 1.0 mg / mL graphene oxide dispersion prepared above and stir for 1 h (300-350 r / min) to obtain a uniformly dispersed Nano silver-graphene oxide dispersion;

[0053] (3) Add all the nano-silver-graphene oxide dispersion into 100g mass fraction of 1% nano-cellulose dispersion and stir for 2-3h (300-350r / min) to obtain uniformly dispersed nano-silver-graphene oxide - nanocellulose dispersion;

[0054] (4) Vibrate all the dispersion liquid obtained in step (3) for 60min under 400w ultrasonic conditions, and form a film through vacuum suction filtration, take out th...

Embodiment 3

[0061] (1) Adopt Hummers method to prepare graphene oxide, after drying, dispersing, be dissolved in deionized water to obtain 400mL of 1.0mg / mL graphene oxide dispersion liquid; Wherein the prepared graphene oxide monolayer rate is 50%~60% , the sheet diameter is 100nm~1μm, and the single layer thickness is 0.8nm~1.2nm;

[0062] (2) Add 1mg of nano-silver (the particle size of nano-silver is 50-100nm) into 100mL of the above graphene oxide dispersion and stir for 1h (300-350r / min) to obtain a uniformly dispersed nano-silver-graphene oxide dispersion liquid;

[0063] (3) Add all nano-silver-graphene oxide dispersion liquid to 100g mass fraction of 1% nano-cellulose dispersion liquid and stir for 2-3h (300-350r / min) to obtain uniformly dispersed nano-silver-graphene oxide ene-nanocellulose dispersion;

[0064] (4) Vibrate all the dispersion liquid obtained in step (3) for 60min under 400w ultrasonic conditions, and form a film through vacuum suction filtration, take out the f...

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Abstract

The invention belongs to the technical field of functional materials and in particular relates to a plant nanocellulose-based flexible electromagnetic shielding film as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing a nano-silver-graphene oxide-nanocellulose dispersion solution which is uniformly dispersed, wherein the total mass of nano-silver is 1 percent to 10 percent of the total mass of graphene oxide and the total mass of the graphene oxide is 5 percent to 20 percent of the total mass of nanocellulose; (2) after carrying out ultrasonic de-foaming on the dispersion solution, filtering in vacuum to form a film; drying the film to obtain a nano-silver-graphene oxide-nanocellulose composite film; (3) reducing thenano-silver-graphene oxide-nanocellulose composite film by utilizing vitamin C to obtain a nano-silver-graphene-nanocellulose composite film. The preparation method provided by the invention has the advantages of simple preparation technology and easiness for operation and production; the prepared composite film has antibacterial and electromagnetic shielding effects and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a plant nanocellulose-based flexible electromagnetic shielding film and a preparation method and application thereof. Background technique [0002] Electromagnetic shielding film can effectively block the radiation of radio waves, infrared, ultraviolet and other frequencies commonly used in eavesdropping techniques, thus successfully blocking electronic eavesdropping. The new technology of the existing electromagnetic shielding film is to vacuum sputter indium tin oxide (ITO) on the substrate, but the preparation cost is high, it is not environmentally friendly, and the shielding film is easy to breed bacteria during daily use, which is very unhygienic. Therefore, there is an urgent need to develop an electromagnetic shielding film with antibacterial effect, low cost, and environmental protection. [0003] Nanocellulose is a green and environmentally fri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/12C08J5/18C08L1/02C08K3/08C08K3/04
CPCC08J5/18C08J7/12C08J2301/02C08K3/04C08K2003/0806C08K2201/003
Inventor 杨仁党陈通谢俊贤
Owner SOUTH CHINA UNIV OF TECH
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