Electromagnetic shielding film and preparation method thereof

A technology of electromagnetic shielding film and conductive adhesive, applied in the fields of magnetic field/electric field shielding, electrical components, conductive adhesives, etc., can solve the problems of inconvenient transportation of export products, heavy metal pollution, environmental protection restrictions, etc.

Active Publication Date: 2017-10-03
HAINING ZHUOTAI ELECTRONICS MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing electromagnetic shielding film has poor shielding performance and cannot meet the shielding requirements for ultra-high frequency signals. It is often necessary to use copper, aluminum, silver and other metal foils to strengthen the shielding, and the metal foil and electromagnetic shielding film The difference makes it poor in reliability and heat resistance, and it is prone to high-temperature tin-flooding explosion problems during the application process; moreover, the thickness of the metal foil needs to be more than 2 μm, and it is not resistant to bending and flexible when it is pasted on a flexible circuit board. Difference
In addition, the existing electromagnetic shielding film has poor storage performance and high storage requirements. It needs to be stored at a low temperature below 10°C, and the storage period does not exceed three months, which increases storage costs during customer use, and for export products The transportation link has caused great inconvenience and has become a major obstacle to market development
In addition, in the prior art, the electroplating process is usually used to prepare the electromagnetic shielding film, which belongs to the heavy metal pollution project and is restricted by environmental protection.

Method used

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  • Electromagnetic shielding film and preparation method thereof
  • Electromagnetic shielding film and preparation method thereof
  • Electromagnetic shielding film and preparation method thereof

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preparation example Construction

[0073] The present invention also provides a preparation method of the electromagnetic shielding film described in the above technical solution, comprising the following steps:

[0074] a) coating a release liquid on the surface of the carrier layer and drying to form a release layer;

[0075] b) coating an insulating material on the surface of the release layer and drying to form an insulating layer;

[0076] c) sequentially sputtering a metal bottom layer on the surface of the insulating layer, evaporating a metal functional layer, and sputtering a metal protective layer to form a metal layer;

[0077] d) coating conductive glue on the surface of the metal layer to form a conductive glue layer;

[0078] e) Attaching a protective film on the surface of the conductive adhesive layer to form a protective film layer.

[0079] Wherein, the types, thicknesses and sources of the carrier layer, the release layer, the insulating layer, the metal layer, the conductive adhesive layer...

Embodiment 1

[0091] 1) Provide a roll of PET film with a thickness of 50 μm and a width of 550 mm (length 200 meters), and use a comma knife coater to coat the release liquid on the surface of the PET roll film to form a coating with a thickness of less than 1 μm , bake and dry at 150°C for 3 minutes to form a release layer;

[0092] Preparation of the release liquid used: Mix 30 parts of HDPE plastic pellets with 70 parts of PMA solvent and grind them into nano-scale by a mill to form a release liquid;

[0093] 2) Coat the insulating material on the surface of the release layer by using a comma scraper coating method, control the thickness of the insulating material between 2 and 10 μm, and form an insulating layer after drying;

[0094] Preparation of insulating materials used: 30 parts of E-44 epoxy resin (provided by Jinan Baorui Resin Chemical Co., Ltd.), 10 parts of acrylonitrile rubber (provided by Shandong Zixiang Chemical Industry Co., Ltd.), 8501 black paste (provided by Risheng ...

Embodiment 2

[0100] 1) Provide a roll of PET film with a thickness of 75 μm and a width of 550 mm (length 200 meters), and use a comma knife coater to coat the release liquid on the surface of the PET roll film to form a coating with a thickness of less than 1 μm , bake and dry at 160°C for 2 minutes to form a release layer;

[0101] Preparation of the release liquid used: Mix 30 parts of HDPE plastic pellets with 70 parts of PMA solvent and grind them into nano-scale by a mill to form a release liquid;

[0102] 2) Coat the insulating material on the surface of the release layer by using a comma scraper coating method, control the thickness of the insulating material between 2 and 10 μm, and form an insulating layer after drying;

[0103] Preparation of insulating materials used: 70 parts of PI ink (provided by Huizhou Jiaqi Coating Co., Ltd.) with model number F8812, 2 parts of PI906 epoxy curing agent (provided by Huizhou Jiaqi Coating Co., Ltd.) and 28 parts of 8501 black paste parts, ...

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Abstract

The invention provides an electromagnetic shielding film and a preparation method thereof. The electromagnetic shielding film provided by the invention comprises a carrier layer, a release layer, an insulation layer, a metal layer, a conduction adhesive layer and a protective film layer, which are in contact in sequence, wherein the metal layer comprises a metal bottom layer, a metal function layer and a metal protection layer that are in contact with one another in sequence; the metal bottom layer is in contact with the insulation layer; the metal protection layer is in contact with the conduction adhesive layer; and the metal function layer is formed by one or more of copper, aluminum, silver and tin. The electromagnetic shielding film provided by the invention has an excellent shielding effect for an ultrahigh frequency electromagnetic signal and has high reliability and heat resistance, high temperature resistance tin drift can be realized, the fatal problems of plate cracking and the like are not caused, and the flexibility of the electromagnetic shielding film is comparatively high; in addition, the electromagnetic shielding film provided by the invention is high in storage performance and can be stored at normal temperature, and the storage period can reach above 6 months.

Description

technical field [0001] The invention relates to the technical field of shielding materials, in particular to an electromagnetic shielding film and a preparation method thereof. Background technique [0002] Electromagnetic shielding refers to the ability to shield external interference electromagnetic signals, so that electronic components are not affected or interfered by other equipment, and it is one of the important indicators of product quality. With the continuous improvement of people's requirements for network communication speed, portable terminal devices such as smartphones have higher and higher requirements for the shielding of UHF (1Ghz-50Ghz) signals. to fulfill. [0003] At present, the popular electromagnetic shielding films on the market usually mainly include a base film layer, a shielding film layer and a conductive film layer; the shielding film layer is usually a pure silver metal layer, which is mainly used in the preparation of water electroplating pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/00C09J9/02C09J163/10C09J175/04C09J177/00C09J167/00C08L63/00C08L33/20H05K9/00
CPCC08K2003/0806C08K2003/085C08K2003/0862C08L63/00C09J9/02C09J163/10C09J2301/312C09J2301/314C09J2400/16H05K9/0088C08L75/04C08L67/00C08K3/08C08L77/00C08L33/20
Inventor 田海玉
Owner HAINING ZHUOTAI ELECTRONICS MATERIALS CO LTD
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