Flexible stretchable electromagnetic shielding film and preparation method thereof

An electromagnetic shielding film, electromagnetic shielding technology, applied in the fields of magnetic field/electric field shielding, chemical instruments and methods, electrical components, etc. Excellent electromagnetic shielding performance, stable electromagnetic shielding performance, and the effect of improving electromagnetic shielding performance

Inactive Publication Date: 2016-10-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, many electromagnetic shielding materials on the market are made by metal plating, coating, pasting or blending conductive fibers on the surface of the material. Many problems are prone to occur in the process of preparation and use, such as poor bonding ability between metal and material, and easy to fall off. , the coating is easily scratched and loses shielding performance, the preparation process is seriously polluted, etc., and the material is relatively rough, poor in flexibility, airtight, poor in touch, not wearable, and it is difficult to meet the "thinness" required by modern electromagnetic shielding materials. Therefore, it is urgent to develop a wearable electromagnetic shielding material with high electromagnetic shielding performance, good flexibility, light weight, good durability

Method used

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

Examples

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Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Ultra-thin elastic stretchable electromagnetic shielding film

[0035] A method for preparing a flexible and stretchable electromagnetic shielding film, the specific steps are:

[0036] The first step: immerse the carbon nanotube film in the graphene suspension for 3 hours, immerse once, take it out, and dry it naturally at room temperature to obtain a flexible nano electromagnetic shielding composite film 2, and conduct electricity at both ends Silver glue adheres to copper wire electrodes;

[0037] The selected size of the carbon nanotube film is 20×28cm 2 The carbon nanotube film (Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences) is made of multi-walled carbon nanotubes. The diameter of the carbon nanotubes is about 20nm, the film thickness is 20um, the porosity is 75%, and the tensile strength is about 200MPa, conductivity is about 1×10 5 S / m; the graphene suspension with the concentration of the graphene suspension of 2 mg / ml (N...

Embodiment 2

[0045] Example 2: Flexible electromagnetic shielding film with ultra-high shielding effectiveness

[0046] A method for preparing a flexible and stretchable electromagnetic shielding film, the specific steps are:

[0047] Step 1: Immerse 3 carbon nanotube films in graphene suspension for 3 hours, immerse once, take it out, and dry naturally at room temperature to obtain 3 layers of flexible nano electromagnetic shielding composite film 2 in it One end of the two pieces is coated with conductive silver glue to adhere the copper wire electrode;

[0048] The selected size of the carbon nanotube film is 20×30cm 2 The carbon nanotube film (Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences) is made of multi-walled carbon nanotubes. The diameter of the carbon nanotubes is about 20nm, the film thickness is 20um, the porosity is 75%, and the tensile strength is about 200MPa, conductivity is about 1×10 5 S / m; the graphene suspension with the concentration of the...

Embodiment 3

[0057] Example 3: Elastic stretchable electromagnetic shielding adhesive film

[0058] A method for preparing a flexible and stretchable electromagnetic shielding film, the specific steps are:

[0059] The first step: immerse the carbon nanotube film in the graphene suspension for 3 hours, immerse once, take it out, and dry it naturally at room temperature to obtain a flexible nano electromagnetic shielding composite film 2, and conduct electricity at both ends Silver glue adheres to copper wire electrodes;

[0060] The selected size of the carbon nanotube film is 20×30cm 2 The carbon nanotube film (Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences) is made of multi-walled carbon nanotubes. The diameter of the carbon nanotubes is about 20nm, the film thickness is 20um, the porosity is 75%, and the tensile strength is about 200MPa, conductivity is about 1×10 5 S / m; the graphene suspension with the concentration of the graphene suspension of 2 mg / ml (Num...

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Abstract

The invention provides a flexible stretchable electromagnetic shielding film and a preparation method thereof. The preparation method of the flexible stretchable electromagnetic shielding film comprises the following steps: selecting an elastic membrane as an elastic adhesion matrix, stretching the elastic membrane to a certain elongation, then fixing the elastic membrane, and coating a liquid elastic adhesive layer on the surface of the elastic membrane; crushing a flexible nano electromagnetic shielding complex film on the liquid elastic adhesive layer, coating resin with protective effect at the upper side of the flexible nano electromagnetic shielding complex film to form a resin layer, and curing the liquid elastic adhesive and the resin under certain conditions; and releasing a tensile force applied onto the elastic adhesion matrix, so as to drive the flexible nano electromagnetic shielding complex film to retract, namely the flexible stretchable electromagnetic shielding film is obtained. The prepared flexible stretchable electromagnetic shielding film has good elasticity, high elongation (20-50%) and excellent electromagnetic shielding property (electromagnetic wave absorptivity is more than or equal to 99% at the frequency of 1-5GHz) and can bear certain bending and compression deformation.

Description

Technical field [0001] The invention relates to the field of electromagnetic shielding materials, and more specifically, to the field of flexible stretchable electromagnetic shielding films. Background technique [0002] With the rapid development of science and technology, electromagnetic waves have been widely used in aviation, aerospace, communications, household appliances, military and other fields, and the problem of electromagnetic pollution has become increasingly prominent. The electromagnetic energy radiated by electromagnetic waves is increasing at an annual rate of 7%-14%, and electromagnetic pollution to the environment is becoming more and more serious. All over the world, various information networks transmit hundreds of millions of important military, political, and economic intelligence and information. Information leaks caused by electromagnetic wave radiation also occur from time to time, directly threatening the country’s politics, economy, and Military secur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B27/28B32B27/30B32B27/36B32B25/00B32B7/12B32B3/08B32B33/00B32B37/12B32B37/10B32B38/12H05K9/00
CPCB32B3/08B32B7/12B32B9/007B32B9/043B32B9/045B32B25/00B32B27/283B32B27/308B32B27/36B32B33/00B32B37/10B32B37/12B32B38/12B32B2037/1269B32B2255/26B32B2260/02B32B2260/04B32B2307/212B32B2307/51B32B2307/554H05K9/0081
Inventor 许福军高扬
Owner DONGHUA UNIV
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