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A kind of transparent flexible and stretchable electromagnetic shielding film and preparation method thereof

An electromagnetic shielding film, a transparent technology, applied in the fields of magnetic/electric field shielding, chemical instruments and methods, electrical components, etc., which can solve the problems of low cost, lack of stretchability and high production costs that are not suitable for large-scale production. , to achieve the effect of high light transmittance and electromagnetic shielding efficiency, easy performance control and good stability

Active Publication Date: 2020-05-01
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the photolithography process often requires complex process technology and expensive equipment support, and the production cost is high, which is not suitable for the low-cost requirements of mass production.
[0004] In addition, most of the above-mentioned transparent electromagnetic shielding films are based on polyester (PET) or polyimide (PI) materials, which often only have flexible flexibility but not stretchability, which is very important for flexible wearable electronics. The application has great limitations

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0074] The precursor of polydimethylsiloxane (PDMS) and its curing agent were mixed at a mass ratio of 10:1, and the mixed solution was spin-coated on a glass substrate by a spin-coating process, and then heated and cured at 60°C for 30 min to form a semi- Cured PDMS film. The thickness of the final PDMS film (20-500 μm) can be adjusted by controlling the spin-coating speed (400-2000 rpm) and time (5-30 s). Using the ethanol / water dispersion of polystyrene (PS) microspheres with an average particle size of 10 μm as the colloid, the PS microsphere colloid monolayer self-assembled on the surface of the PDMS film by the gas-liquid interface self-assembly method to form a closely arranged PS colloid array . Then use plasma (Plasma) to etch the closely arranged PS colloidal particles into a non-closely arranged structure in an oxygen atmosphere. The degree of etching (the distance between adjacent PS colloidal particles) can be determined by etching power and etching time. In thi...

Embodiment 2

[0076] Using thermoplastic polyurethane (TPU) as raw material, dissolve it with N,N-dimethylformamide (DMF) to prepare a certain concentration of TPU / DMF solution, pour it into a flat PTFE container, heat and dry it, and then shape it into TPU Transparent film. Silicon dioxide (SiO2) with an average particle size of 500nm 2 ) microsphere dispersion is a colloid, and the SiO 2 Microsphere colloidal monolayer self-assembled on the surface of TPU film to form tightly arranged SiO 2 colloidal array. In repassing reactive ion etching (RIE), the closely arranged PS colloidal particles are etched into a non-closely arranged structure, and the degree of etching (adjacent SiO 2 The distance between colloidal particles) can be regulated by etching processes such as gas flow, temperature, and gas pressure. In this case, SiO 2 The shortest distance between colloidal particles is controlled at about 200nm. Deposition of gold onto the aforementioned non-closely packed SiO by magnetron ...

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Abstract

Disclosed are a transparent, flexible and stretchable electromagnetic shielding thin film and a method for preparing same. The electromagnetic shielding thin film comprises: a transparent, flexible and stretchable substrate; a grid-shaped metal shielding layer; and a transparent, flexible and stretchable encapsulation layer. The grid-shaped metal shielding layer is between the transparent, flexible and stretchable substrate and the transparent, flexible and stretchable encapsulation layer. The grid-shaped metal shielding layer is prepared by means of a combination of a colloidal etching method and a metal deposition method, and the main steps thereof are: 1) closely arranging a single layer of colloidal particles on the transparent, flexible and stretchable substrate; 2) etching the single layer of closely arranged colloidal particles to be in a non-close arrangement; 3) depositing a nano-metal layer on the transparent, flexible and stretchable substrate for the single layer of non-closely arranged colloidal particles; and 4) removing the colloidal particles to obtain the grid-shaped metal shielding layer deposited on the transparent, flexible and stretchable substrate. The flexible and stretchable electromagnetic shielding thin film prepared according to the present invention is simple in structure and easy to manufacture, and has a good stretchability and electromagnetic shielding performance.

Description

technical field [0001] The invention relates to an electromagnetic shielding material, especially a transparent, flexible and stretchable electromagnetic shielding film and a preparation method thereof. Background technique [0002] With the rapid development of the electronic industry and the wide application of electronic equipment, the electromagnetic waves radiated by electronic devices may not only cause abnormal operation of electronic devices, but also affect people's healthy life, and even destroy sensitive devices of military equipment, making radio communication command systems , weapon combat platforms, etc. were damaged. Electromagnetic shielding materials are an effective means to protect against electromagnetic radiation pollution, and have received extensive attention and application in recent years. [0003] In different application fields, different requirements are put forward for the effectiveness of electromagnetic shielding. In some special purposes, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00B32B15/02B32B15/04B32B7/10
CPCB32B7/10B32B15/02B32B15/04H05K9/00
Inventor 胡友根赵涛张馨予梁先文朱朋莉孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI