Damp and heat resistant electromagnetic shielding film, composite material, preparation method and application

A technology of electromagnetic shielding and composite materials, applied in the direction of magnetic/electric field shielding, electrical components, etc., can solve problems such as difficult processing, corrosion and damage of metal materials, poor mechanical properties of films, etc., to achieve enhanced mechanical properties and electrical conductivity, high electromagnetic Effect of shielding performance and excellent mechanical properties

Active Publication Date: 2019-10-15
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, highly conductive metals, such as copper, silver, nickel, etc., have excellent electromagnetic shielding properties, but their applications in weight-sensitive fields are limited due to their shortcomings such as high density, high quality, and difficulty in processing and molding
There has been work using the high conductivity of carbon nanotube films to prepare carbon nanotube electromagnetic shielding paper (CN 107201689 A), but the mechanical properties of the film are poor (only 12MPa), and the electromagnetic shielding efficiency is only 30dB, which is difficult for practical application
In order to improve the electromagnetic shielding effectiveness of carbon nanotubes, some researchers combined copper and other metals with carbon nanotubes (CN 107557769A, CN 109729707A, CN105150624A). Although the electromagnetic shielding effectiveness of carbon nanotubes can be greatly improved, these works have not Considering the mechanical properties of materials, it is difficult for practical application; and metal materials are easily corroded and damaged by oxygen, water, etc. in the environment, which seriously affects the electromagnetic shielding effectiveness and mechanical properties of materials

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  • Damp and heat resistant electromagnetic shielding film, composite material, preparation method and application
  • Damp and heat resistant electromagnetic shielding film, composite material, preparation method and application
  • Damp and heat resistant electromagnetic shielding film, composite material, preparation method and application

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preparation example Construction

[0048] Another aspect of the embodiments of the present invention provides a method for preparing a heat and humidity resistant electromagnetic shielding film, which includes:

[0049] Provide carbon nanotube films;

[0050] Depositing a conductive layer on the surface of the carbon nanotube film,

[0051] And by controlling the structure of the carbon nanotube film and the deposition parameters of the conductive layer, a conductive / carbon nanotube composite structure is formed between the carbon nanotube film and the conductive layer to obtain a conductive composite carbon nanotube film.

[0052] In some preferred embodiments, the preparation method includes: preparing the carbon nanotube thin film by at least any one of floating catalytic chemical vapor deposition, vacuum filtration, coating, and 3D printing.

[0053] Further, the thickness of the carbon nanotube film layer is above 0.1 μm.

[0054] In some preferred embodiments, the preparation method includes: at least d...

Embodiment 1

[0083] A carbon nanotube film with a thickness of 3 μm was obtained by floating catalytic chemical vapor deposition, and a single-sided copper layer was plated on the surface of the CNT film by magnetron sputtering. Adjust the distance between the target and the CNT film, set the speed of the sample holder to 20r / min, so that Cu can be evenly sputtered onto the CNT film. Pump the vacuum of the instrument body to 8×10 -4 Pa, and high-purity argon gas was introduced, and the gas flow rate was adjusted to 20 sccm for pre-sputtering for 5 minutes to effectively remove impurities on the surface of the Cu target. The sputtering power of Cu is 200W, and the sputtering pressure is 0.3Pa. Respectively control the sputtering time to be 450s to obtain a CNT composite film with a Cu layer thickness of 0.4 μm, a Cu / CNT composite structure of 0.2 μm, and a Cu composite carbon nanotube film (Cu layer-Cu / CNT composite structure-CNT film layer). By adjusting different deposition times, such...

Embodiment 2

[0087] The CNT film is prepared by vacuum filtration method with a thickness of 10 μm, and a layer of silver film is covered on the surface of the film by vacuum evaporation method. By adjusting the evaporation temperature of 700-1200°C and the time of 10-1000s, the CNT / Ag composite structure and the Ag layer are adjusted. The thickness of the Ag layer is 0.1 μm, and the Ag / CNT composite structure is 0.5 μm. Then cover SiO on the surface of CNT / Ag by coating method 2 Protective layer with a thickness of 50 μm, cured to obtain CNT / Ag / SiO 2 Composite film. The shielding effect of the composite film reaches 100dB, the tensile strength is increased by 70%, and the shielding effect is not lower than 80dB for 40 days in an environment with a humidity of 75%.

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Abstract

The invention discloses a damp and heat resistant electromagnetic shielding film, a composite material, a preparation method and an application. The damp and heat resistant electromagnetic shielding film comprises a conductive composite carbon nanotube film. The conductive composite carbon nanotube film comprises a carbon nanotube film layer, a conductive substance / carbon nanotube composite structure and a conductive layer arranged in turn along a set direction. The preparation method includes the steps of depositing a conductive layer on the surface of a carbon nanotube film and forming a conductive substance / carbon nanotube composite structure between the carbon nanotube film and the conductive layer by controlling the structure of the carbon nanotube film and the deposition parameters of the conductive layer, so as to obtain a conductive composite carbon nanotube film. The unification of the electromagnetic shielding performance, mechanical performance and environmental stability ofthe composite film is realized through the composition with the carbon nanotube film layer and the water and oxygen isolation of a protective layer. Through the combination of a carbon nanotube filmlayer and a composite material preform resin layer, a structure and function integrated composite material with excellent mechanical performance, high electromagnetic shielding performance and damp and heat resistance is obtained.

Description

technical field [0001] The invention relates to a composite material, in particular to a heat-and-humidity resistant electromagnetic shielding film, a composite material, a preparation method and application thereof, and belongs to the technical field of composite materials and preparation. Background technique [0002] Composite material is a kind of engineering material with specific strength, high specific stiffness, corrosion resistance and easy processing. It is widely used in aerospace, transportation, sporting goods and other fields. However, since composite materials are composed of reinforcing fibers and polymers, their electrical conductivity is generally poor, and they are limited in fields such as antistatic, lightning protection, and electromagnetic shielding. [0003] Carbon nanotube is a new material with ultra-high specific surface area and excellent mechanical and electrical properties. Its excellent electrical conductivity makes it have potential applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K9/00
CPCH05K9/0088
Inventor 吕卫帮吴炜曲抒旋何静宇巩文斌蒋瑾
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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