Flexible electromagnetic shielding film and preparation method thereof

An electromagnetic shielding and film technology, applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, film/sheet adhesives, etc., can solve the problems of high density, single shielding mechanism, easy to corrode flexible electronic devices, etc. Low density, uniform conductive network, good electromagnetic shielding performance

Pending Publication Date: 2021-12-31
南京恒电先进微波技术研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional metal-based electromagnetic shielding materials have good electromagnetic shielding performance, but the shielding mechanism is single, mainly based on reflection, and the limitations of high density and easy corrosion have made it difficult to meet the growing needs of emerging fields such as flexible electronic devices. Therefore, People are committed to developing flexible new electromagnetic shielding materials with ultra-thin and ultra-light properties

Method used

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  • Flexible electromagnetic shielding film and preparation method thereof
  • Flexible electromagnetic shielding film and preparation method thereof
  • Flexible electromagnetic shielding film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0028] A preparation method of a flexible electromagnetic shielding film, the specific method comprising:

[0029] (1) Using silver nitrate (1g) as precursor, PVP (0.1g) as coating agent, sodium chloride (4ml, 1mmol / L) as control agent, ethylene glycol (30ml) as solvent and reducing agent, wood Su (3 mg) was used as the catalyst, and the silver nanowire hydrogel was prepared by the polyol method. The hydrogel was repeatedly washed with ethanol to remove the coating agent, impurities and free monomers on the surface of the nanowires, and the silver nanowire aerogel was obtained by freeze-drying technology.

[0030] (2) Compress the obtained airgel with a cold press to obtain a silver nanowire airgel film with a thickness of 20 μm, using 5vol% HCl-N 2 The atmosphere induced rapid self-sintering on the surface, and the obtained airgel film was cut into spherical shapes using a cutting machine.

[0031] (3) Polyvinyl alcohol (PVA) was dissolved in deionized water to form a 3 wt%...

Embodiment 2

[0033] A preparation method of a flexible electromagnetic shielding film, the specific method comprising:

[0034] (1) Use silver nitrate (0.5g) as the precursor, PVP (0.3g) as the coating agent, copper chloride (5 ml, 1mmol / L) as the control agent, and glycerol (20ml) as the solvent and reducing agent , lignin (6mg) was used as a catalyst to prepare silver nanowire hydrogels by polyol method. The hydrogel was repeatedly washed with ethanol to remove the coating agent, impurities and free monomers on the surface of the nanowires, and the silver nanowire aerogel was obtained by supercritical drying technology.

[0035] (2) The obtained airgel was compressed by the capillary plate method to obtain a silver nanowire airgel film with a thickness of 5 μm, and the surface nanowires were induced to undergo self-sintering by ultraviolet light irradiation, and the obtained airgel was cut by a laser cutter The film is cut into micro-sized films of 0.1-1 mm, and processed into L-shaped ...

Embodiment 3

[0039] A preparation method of a flexible electromagnetic shielding film, the specific method comprising:

[0040] (1) Use copper nitrate (0.3g) as the precursor, PVP (0.2g) as the coating agent, ferric chloride (5ml, 5mmol / L) as the control agent, ethylene glycol (30ml) as the solvent and reducing agent, Lignin (3 mg) was used as a catalyst to prepare copper nanowire hydrogels by polyol method. The hydrogel was repeatedly washed with ethanol to remove the coating agent, impurities and free monomers on the surface of the nanowires, and the copper nanowire aerogel was obtained by freeze-drying technology.

[0041] (2) Use a laser cutting machine to cut the obtained airgel into the required three-dimensional shape, use focused infrared light to induce a rapid temperature rise on the surface of the film, complete self-sintering, and use a mold to press it on the same shape as the required shielding device On the surface of the 50 μm thick PI film, a 30 μm thick copper nanowire a...

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Abstract

The invention designs a flexible electromagnetic shielding film and a preparation method thereof. The preparation method of the flexible electromagnetic shielding film comprises the following steps: inducing self-crosslinking or flocculation of one or more metal nanowires of gold, silver, copper, nickel and zinc to prepare metal-based gel; S2, compressing the aerogel prepared in step S1 into a thin film, performing surface local enhancement through chemical vapor treatment or light irradiation, and then performing cutting, folding or shaping; and S3, attaching an aerogel thin film prepared in step S2 to a flexible substrate in a covering mode, so as to prepare the flexible electromagnetic shielding film. The prepared flexible stretchable electromagnetic shielding film is small in thickness, high in conductivity, good in flexibility, good in machinability and excellent in electromagnetic shielding performance, and can shield 99.9999999% of electromagnetic waves within the frequency of 2-18 GHz.

Description

technical field [0001] The invention relates to the field of designing electromagnetic shielding materials, in particular to a flexible electromagnetic shielding film and a preparation method thereof. Background technique [0002] With the rapid development of the electronic information industry and the wide application of electronic and electrical equipment in all walks of life, modern telecommunication technologies represented by 5G are rapidly popularizing, and the information transmission rate, frequency and signal strength of 5G mobile phones and communication base stations have been significantly improved. . While promoting the progress of human civilization, electromagnetic waves also bring certain negative effects. For example, electromagnetic waves will affect the signal transmission of some testing equipment in hospitals, making them unable to work normally; electromagnetic waves will interfere with aircraft communication systems, driving systems, etc., making the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B15/00B32B15/09B32B27/28B32B15/08B32B7/12B32B37/00C09J7/20B29C65/48H05K9/00
CPCB32B5/18B32B27/36B32B27/281B32B27/065B32B37/00B32B7/12C09J7/20B29C65/48B29C65/481B29C66/45B29C66/73141B29C66/742H05K9/0081B32B2037/243B32B2255/10B32B2255/26B32B2266/126B32B2307/212B32B2307/202C09J2301/122
Inventor 祝温泊彭飞王晓婷王春青李明雨
Owner 南京恒电先进微波技术研究院有限公司
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