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A kind of graphene electromagnetic shielding film and preparation method thereof

An electromagnetic shielding film, graphene technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of difficult to achieve, inability to use non-conductive substrates, and high production costs

Active Publication Date: 2020-10-27
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN1787114 discloses a kind of composite metal electromagnetic shielding film, metals such as copper and iron are deposited on conductive substrates by electrodeposition in aqueous solution, and its coating thickness is more than 15 microns, but the conductivity of the substrate for electrodeposition (electroplating) must be good , and because of this, it cannot be used for electromagnetic shielding applications with non-conductive substrates
CN101411254A discloses a kind of preparation method of electromagnetic shielding film, it is mainly by coating a layer of silver-containing emulsifier on the transparent substrate, then obtains the developed silver by the mode of exposure and development, and then plate a layer of copper by electroplating, Nickel conductive layer, so that it has high conductivity (surface resistivity 0.4Ω / □) and electromagnetic shielding effect, but the silver emulsifier used in it makes its production cost higher
However, the preparation process is complicated and time-consuming (more than 24 hours), the coating thickness is between 0.2-0.4mm, which is relatively thick, and the electromagnetic shielding effect is only 40-50dB
CN106634311A discloses a modified graphene electromagnetic shielding coating, which sprays the target substrate after mixing the modified graphene slurry with the existing graphene slurry. However, the preparation process of the method shown in this patent is complicated, time-consuming and difficult to apply. The thickness is thick, and the electromagnetic shielding effect is only 40~50dB
[0010] It can be seen from the above that the non-metallic electromagnetic shielding film not only has problems in thickness and preparation process, but it is difficult to achieve a high electromagnetic shielding effect like metal. In addition, the shielding film prepared by it is too thick, and the shielding effect is far lower than that of commercial products. However, the actual demand for 5G electromagnetic shielding should be above 75dB. Therefore, the industry urgently needs to provide a low-cost, flexible and high-shielding electromagnetic shielding film preparation method that can be made of non-metallic substrates.

Method used

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  • A kind of graphene electromagnetic shielding film and preparation method thereof
  • A kind of graphene electromagnetic shielding film and preparation method thereof
  • A kind of graphene electromagnetic shielding film and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1-PI

[0093] The preparation of embodiment 1-PI graphene electromagnetic shielding film

[0094] According to the method provided by the present invention, the PI supporting substrate is cleaned with a strong alkali solution of pH 12~14 to remove dust and oil stains, etc., wherein the thickness of the PI supporting substrate is 50 microns; After being coated on the PI support substrate, it was dried at 120°C for 30 minutes to prepare a composite film, wherein the graphene conductive ink includes DMF, Thermoplastic acrylic resin, graphene, carbon nanotubes, anti-hydrolysis agent; anneal the dried composite film at 300°C for 10 minutes, after annealing, clean the surface of the composite film with deionized water, put into alkaline copper plating Electroplating is carried out in a solution (the present embodiment is a copper chloride system) to form a first conductive layer on the annealed composite film, wherein the electroplating temperature is 30-40° C., and the area ratio of the c...

Embodiment 2

[0096] The preparation of embodiment 2-PET graphene electromagnetic shielding film

[0097] According to the method provided by the present invention, the PET support substrate is cleaned with a strong alkali solution of pH 12~14 to remove dust and oil stains, etc., wherein the thickness of the PET support substrate is 50 microns; After being coated on the PET support substrate, it is dried at 100°C for 15 minutes to prepare a composite film, wherein the graphene conductive ink includes DMF and oily polyurethane resin with a component mass ratio of 1:0.14:0.056:0.014 , graphene, acetylene black; the described composite film is annealed with 200 ℃ for 20 minutes through drying, after annealing, carry out roll pressing, clean this composite film surface with deionized water, put into acidic copper plating solution (this embodiment is copper sulfate system) to form a first conductive layer on the annealed composite film, wherein the electroplating temperature is 30-40°C, the area...

Embodiment 3-A

[0100] The preparation of embodiment 3-ABS graphene electromagnetic shielding film

[0101] According to the method provided by the present invention, the ABS support substrate is cleaned with a strong alkali solution of pH 12~14 to remove dust and oil stains, etc., wherein the thickness of the ABS support substrate is 50 microns; the graphene conductive ink is sprayed by spraying After being placed on the ABS support base, it was dried at 80°C for 50 minutes to prepare a composite film, wherein the graphene conductive ink comprises DMF, thermoplastic acrylic resin, thermoplastic acrylic resin, Graphene, acetylene black, anti-hydrolysis agent; The described composite film is annealed with 160 ℃ for 10 minutes with 160 ℃ of drying, after annealing, carry out hot pressing, clean this composite film surface with deionized water, put into acidic nickel plating solution (this An embodiment is electroplating in a nickel chloride and nickel sulfate system) to form a first conductive ...

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Abstract

The invention provides a method for preparing a graphene electromagnetic shielding film. The method comprises the following steps of: taking a flexible support substrate, and removing oil; coating thegraphene conductive ink on the flexible support substrate after oil is removed to form a graphene conductive ink layer and dry the graphene conductive ink layer to prepare a composite film; performing high-temperature annealing of the dried composite film; electroplating the annealed composite film, depositing a first conductive layer on the annealed composite film, and cleaning the electroplatedcomposite film; and drying the cleaned composite film to obtain the graphene electromagnetic shielding film.

Description

technical field [0001] The invention relates to a method for preparing a graphene electromagnetic shielding film, in particular to a method for preparing a flexible electromagnetic shielding film comprising a non-conductive substrate. Background technique [0002] At present, all kinds of electronic communication equipment use electromagnetic waves as carriers for signal transmission. With the development of the electronic information industry, various electrical equipment and electronic application equipment continue to increase. With the arrival of 5G, the density of base stations will increase, mobile phone terminals will be upgraded, The popularization of Internet of Things terminals will bring about a substantial increase in the demand for electromagnetic shielding and heat-conducting materials, and antenna oscillators. [0003] However, too many electromagnetic wave signals will cause serious electromagnetic interference (EMI) to some precision electronic equipment, af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00C25D3/38C25D5/54
CPCC25D3/38C25D5/54H05K9/0084
Inventor 郑南峰曾子力吴炳辉曹昉毛和旭
Owner XIAMEN UNIV