A kind of transparent electromagnetic shielding film and preparation method thereof

An electromagnetic shielding and film technology, applied in the field of transparent electromagnetic shielding film and its preparation, can solve the problems of reduced electromagnetic wave reflection ability, weak interaction force, poor film connectivity, etc., and achieve the effect of increasing shielding ability and increasing absorption

Active Publication Date: 2021-01-19
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

This leads to a rapid increase in square resistance or even failure of the silver nanowire transparent electromagnetic shielding film during storage, and a rapid decrease in the ability to reflect electromagnetic waves;
[0006] Second, in terms of mechanical stability, the interaction force between the silver nanowire grid and the substrate prepared by the solution method is very weak, so when the film is bent many times, the silver nanowires are easy to peel off, resulting in the connectivity of the film. Deterioration, the conductivity of the corresponding film and the ability to reflect electromagnetic waves decline rapidly;

Method used

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

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preparation example Construction

[0044] Substrate 1 is glass, polyethylene terephthalate (PET) film, polyimide PI film, polyvinyl alcohol PVA film, polystyrene (PS) film or polydimethylsiloxane (PDMS) ) any of the films. A kind of preparation method of transparent electromagnetic shielding film of the present invention comprises the following steps:

[0045] S1, using acetone, ethanol and deionized water to clean the substrate;

[0046] S2, coating the silver nanowire dispersion with a concentration of 0.5-10 mg / ml on the surface of the substrate;

[0047] S3, annealing the substrate prepared in step S2 within a temperature range of 50-100° C. for 0.2-1 hour to make a semi-finished product;

[0048] S4, coating the dispersion composed of iron ferric oxide nanoparticles and polyvinylpyrrolidone on the surface of the semi-finished product prepared in step S3;

[0049] S5, annealing the semi-finished product prepared in step S4 at a temperature range of 50-100° C. for 0.2-1 hour to prepare a transparent elect...

Embodiment 1

[0053] A kind of transparent conductive film prepared by spin-coating method

[0054] Preparation of ferric oxide metal oxide nanoparticles and polyvinylpyrrolidone dispersion:

[0055] First, 100mg of Fe 3 o 4 Nanoparticles were added to 20ml of ethanol, 300mg of polyvinylpyrrolidone was added after sonication at room temperature for 15 minutes, and then the mixture was sonicated at 600kw for 1 hour, and then a stable Fe 3 o 4 Metal oxide nanoparticles and polyvinylpyrrolidone suspension.

[0056] Substrate preparation:

[0057] The glass substrate was sonicated in an acetone-ethanol blend solution with a volume ratio of 1:1 for 5 minutes, then in deionized water for 10 minutes, then taken out and dried with nitrogen, and then treated in a UV-ozone equipment for 10 minutes for use.

[0058] Preparation of transparent conductive film:

[0059] Silver nanowires dispersed in IPA at a concentration of 3.5 mg / ml were dropped onto the substrate, spin-coated at 4000 rpm for 60...

Embodiment 2

[0064] Embodiment 2 A kind of transparent electromagnetic shielding film prepared by ultrasonic spraying method

[0065] Preparation of ferric oxide metal oxide nanoparticles and polyvinylpyrrolidone dispersion: first 50mg of Fe3O4 nanoparticles were added to 20ml of ethanol, and 200mg of polyvinylpyrrolidone was added after ultrasonication at room temperature for 15 minutes, and then the mixture was heated at 600kw Ultrasonic crushing was carried out for 1 hour, and then a stable suspension of iron ferric oxide metal oxide nanoparticles and polyvinylpyrrolidone was obtained.

[0066] Preparation of the substrate: The polyimide (PI) film substrate was sonicated in an acetone-ethanol blend solution with a volume ratio of 1:1 for 5 minutes, then in deionized water for 10 minutes, then taken out and dried with nitrogen, and then Treat in ultraviolet ozone equipment for 10 minutes for standby;

[0067] Preparation of transparent conductive film: adding silver nanowires dispersed ...

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Abstract

The invention discloses a transparent electromagnetic shielding film and a preparation method thereof. From top to bottom, the transparent electromagnetic shielding film comprises a modification layer, a metal conductive grid and a substrate in sequence, wherein the modification layer is a mixture polyvinylpyrrolidone of metal oxide nanoparticles and a polymer. Ferromagnetic particles are introduced for modification, so that the material better absorbs electromagnetic wave in general, and the material can better shield electromagnetic wave.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and in particular relates to a transparent electromagnetic shielding film and a preparation method thereof. Background technique [0002] With the development of human electronic communication and electrical control, the mutual interference between electromagnetic signals has increasingly become a key issue that threatens the normal operation of electronic equipment, and the pursuit of efficient electromagnetic shielding materials in human society is becoming more and more urgent. Traditional electromagnetic shielding materials are mainly based on bulk metals, which use the high conductivity of bulk metals to prevent electromagnetic waves from entering. Although bulk metals have a good shielding effect on electromagnetic waves, their mass is relatively large, and it is not easy to prepare flexible shielding. Materials cannot meet the development requirements of miniaturization, ...

Claims

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Application Information

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IPC IPC(8): H05K9/00C09K3/00
Inventor 焦博吴朝新王振骁侯洵
Owner XI AN JIAOTONG UNIV
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