A kind of graphene modified corn stalk core composite electromagnetic shielding film and preparation method thereof

A graphene modification, corn stalk technology, applied in the direction of graphene, chemical instruments and methods, nano carbon, etc., can solve the problems of complicated preparation process and high price, achieve the effect of wide source of materials, reduce dosage, and solve processing problems

Active Publication Date: 2020-07-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a light and efficient electromagnetic shielding film material, which can be used to generate a strong magnetic field for electron Products, in order to weaken the harm of the magnetic field to the electronic products themselves and the human body, and at the same time prevent the leakage of military secrets, thereby ensuring the safety of the environment and information

Method used

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  • A kind of graphene modified corn stalk core composite electromagnetic shielding film and preparation method thereof
  • A kind of graphene modified corn stalk core composite electromagnetic shielding film and preparation method thereof
  • A kind of graphene modified corn stalk core composite electromagnetic shielding film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A composite electromagnetic shielding film prepared by the following steps:

[0036] (1) Corn stalk pretreatment

[0037] After the corn stalks are peeled off the stalk skin, the corn stalk cores are taken, dried in vacuum at 60°C for 2 hours, pulverized, and passed through a 100-mesh sieve to obtain the straw core powder; then the straw core powder is mixed with ZnCl 2 The aqueous solution is mixed at a mass ratio of 1:1, stirred in a water bath at 75°C for 1 hour, then suction filtered, washed with water, and dried at 40°C to obtain activated straw cores;

[0038] (2) Preparation of hybrid materials

[0039] a. Take the activated straw core powder prepared in step (1) and disperse it in water, the dispersion concentration is 0.1g / mL, stir at a speed of 150rpm, and stir for 10min to obtain a uniformly dispersed straw core powder suspension;

[0040] b. Add dropwise an aqueous solution of graphene oxide with a solid content of 10 mg / g to the suspension of straw core ...

Embodiment 2

[0051] A composite electromagnetic shielding film prepared by the following steps:

[0052] (1) Corn stalk pretreatment

[0053] After the corn stalks are peeled off the stalk skin, the corn stalk cores are taken, dried in vacuum at 60°C for 2 hours, pulverized, and passed through a 100-mesh sieve to obtain the straw core powder; then the straw core powder is mixed with ZnCl 2 The aqueous solution is mixed according to the mass ratio of 1:1.2, stirred in a water bath at 75°C for 1 hour, then suction filtered, washed with water, and dried at 40°C to obtain activated straw cores;

[0054] (2) Preparation of hybrid materials

[0055] a. Take the activated straw core powder prepared in step (1) and disperse it in water, the dispersion concentration is 0.1g / mL, stir at a speed of 150rpm, and stir for 10min to obtain a uniformly dispersed straw core powder suspension;

[0056] b. Add dropwise an aqueous solution of graphene oxide with a solid content of 10 mg / g to the straw core ...

Embodiment 3

[0067] A composite electromagnetic shielding film prepared by the following steps:

[0068] (1) Corn stalk pretreatment

[0069] After the corn stalks are peeled off the stalk skin, the corn stalk cores are taken, dried in vacuum at 60°C for 2 hours, pulverized, and passed through a 100-mesh sieve to obtain the straw core powder; then the straw core powder is mixed with ZnCl 2 The aqueous solution is mixed according to the mass ratio of 1:1.4, stirred in a water bath at 75°C for 1 hour, then suction filtered, washed with water, and dried at 40°C to obtain activated straw cores;

[0070] (2) Preparation of hybrid materials

[0071] a. Take the activated straw core powder prepared in step (1) and disperse it in water, the dispersion concentration is 0.1g / mL, stir at a speed of 150rpm, and stir for 10min to obtain a uniformly dispersed straw core powder suspension;

[0072] b. Add dropwise an aqueous solution of graphene oxide with a solid content of 10 mg / g to the straw core ...

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Abstract

The invention belongs to the technical field of electromagnetic shielding materials and particularly relates to a graphene modified corn straw core composite electromagnetic shielding thin film and apreparation method thereof. The composite electromagnetic shielding thin film consists of an upper layer film, a middle layer film and a lower layer film, wherein the upper layer film and the lower layer film are both graphene oxide films; the middle layer film is a polyvinyl alcohol-graphene / biomass activated carbon film layer. According to the preparation method of the graphene modified corn straw core composite electromagnetic shielding thin film, disclosed by the invention, the use amount of the graphene is reduced, so that the cost of a product is reduced; in addition, materials have widesources and low price, and the problem of treatment of agricultural by-products is solved to a certain extent. Biomass activated carbon has larger specific surface area and forms a better three-dimensional network structure; the capabilities of reflecting and absorbing electromagnetic waves by the materials for multiple times can be improved and the development of light electromagnetic shieldingmaterials is promoted.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding materials, and relates to a graphene-modified corn stalk core composite electromagnetic shielding film and a preparation method thereof. Background technique [0002] With the development of electronic communication technology, the application of electromagnetic waves not only brings convenience to human production and life, but also brings about the problem of electromagnetic interference, which will not only affect the use of electronic equipment, but also cause great harm to the human body. At the same time, electromagnetic waves will Carrying a large amount of state secret information, if it is leaked, it will cause a great threat to national information security. Therefore, for the consideration of environment and safety, it is of great significance to study high-efficiency electromagnetic shielding materials. Due to the maturity of microwave communication and electronic tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C01B32/184C01B32/198C01B32/312C01B32/324
CPCC08J7/0423C08J2367/02
Inventor 陈娟刘志芳葛曷一
Owner UNIV OF JINAN
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