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A reflective electromagnetic shielding film for FPC and a preparation method thereof

An electromagnetic shielding film, reflective technology, applied in magnetic/electric field shielding, reflective/signal coatings, electrical components, etc., can solve the problems of low ink molecular weight, reduced shielding performance, broken metal layer and cracks, etc., to achieve good product flatness , Guaranteed bending resistance and improved electrical conductivity

Active Publication Date: 2018-12-21
SHENZHEN HONGHAI ELECTRON MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the electromagnetic shielding film has the following problems: (1) the insulating layer of the electromagnetic shielding film adopts ink, because the ink molecular weight is low, the filler ratio is high, and the crosslinking density is large, the ink is printed on the common carrier film, and the volume of the curing reaction Large shrinkage, due to the brittle and hard characteristics of the ink itself, will cause the electromagnetic shielding film produced with ink to be hard and brittle, and not resistant to bending; used in the FPC industry, resulting in the flexibility and bending resistance of the electromagnetic shielding film Poor stability and product flatness; when the carrier film is torn off, the ink is easy to adhere to the carrier film; the ink itself is relatively brittle and prone to micro-cracks, resulting in the infiltration of the liquid medicine during the subsequent processing of the FPC, resulting in the product being scrapped
(2) The shielding layer of the electromagnetic shielding film adopts a metal shielding layer or a conductive layer. In the subsequent complex high-temperature and high-pressure operation process of FPC, the metal layer is prone to cracks, oxidation, etc., which will reduce the shielding performance. , and even lose the shielding performance, and at the same time, it is easy to bubble and delaminate in the subsequent reflow soldering process
(3) The shielding film made of ordinary conductive adhesive is difficult to meet the needs of the FPC industry because of its low conductivity, poor continuous conduction, and poor shielding performance.

Method used

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  • A reflective electromagnetic shielding film for FPC and a preparation method thereof
  • A reflective electromagnetic shielding film for FPC and a preparation method thereof
  • A reflective electromagnetic shielding film for FPC and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The first insulating paint layer, the second insulating paint layer and the coating of the electromagnetic wave reflection coating of the FPC reflective electromagnetic shielding film of the present invention use acrylic paint, and the manufacturing process that can be adopted is as follows.

[0062] The first step is to prepare the coatings of the first insulating coating layer, the second insulating coating layer and the electromagnetic wave reflecting coating, which can be prepared in the following order, but the scope of protection is not limited to the following order of A1, A2, A3.

[0063] A1, preparing the first insulating coating layer coating;

[0064] (1) Take 7 parts of acrylic acid, 20 parts of methyl acrylate, 45 parts of acrylonitrile, 20 parts of butyl acrylate, and 7 parts of isobornyl acrylate to obtain acrylic resin I through emulsion polymerization or solution polymerization or bulk polymerization, and add 0.3% to 1.2% persulfate, react at 50 to 60°C...

Embodiment 2

[0083] The manufacturing process of the reflective electromagnetic shielding film for FPC in this embodiment is basically the same as in Example 1, except that the first insulating coating layer coating in A1, the second insulating coating coating coating in A2, and the electromagnetic wave reflection coating coating in A3 Group ratio:

[0084] The proportioning of each raw material that makes acrylic resin I in A1 is different, and the addition amount of acrylic acid, methyl acrylate, acrylonitrile, butyl acrylate, and isobornyl acrylate are respectively 3, 10, 30, 10, 5 parts; The amounts of pigment carbon black, titanium dioxide and silicon oxide added to the acrylic resin I were 10%, 3%, and 5% respectively.

[0085] The ratio of each raw material that makes acrylic resin II in A2 is different, and the addition amount of acrylic acid, ethyl acrylate, butyl methacrylate, acrylonitrile is respectively 2, 10, 30, 5 parts; The amount of elastic microspheres is 10%, and the pa...

Embodiment 3

[0090] The manufacturing process of the reflective electromagnetic shielding film for FPC in this embodiment is basically the same as in Example 1, except that the first insulating coating layer coating in A1, the second insulating coating coating coating in A2, and the electromagnetic wave reflection coating coating in A3 Group ratio:

[0091] The ratios of the raw materials for the acrylic resin I obtained in A1 are different, and the additions of acrylic acid, methyl acrylate, acrylonitrile, butyl acrylate, and isobornyl acrylate are respectively 10, 30, 60, 30, and 10 parts; The amounts of pigment carbon black, titanium dioxide and silicon oxide added to the acrylic resin I were 20%, 10%, and 15% respectively.

[0092] The ratios of raw materials for the acrylic resin II obtained in A2 are different, and the addition amounts of acrylic acid, ethyl acrylate, butyl methacrylate, and acrylonitrile are respectively 5, 40, 60, and 10 parts; The amount of elastic microspheres i...

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Abstract

The invention provides a preparation method of a reflective electromagnetic shielding film for FPC, comprising the following steps: first, preparing a coating of a first insulating coating layer, a second insulating coating layer and an electromagnetic wave reflecting coating; 2, coat; The first insulating coating layer is an abrasion-resistant coating, and the abrasion resistance is more than 1000 times; The second insulating coating layer is a coating with high filling and high toughness, and the bending resistance is more than 80000; The coating of electromagnetic wave reflective coating comprises a base resin and a metal filler, wherein the metal filler is sheet silver-coated glass or sheet silver-coated copper powder or leaf silver-coated copper powder or dendritic silver-coated copper powder; The carrier membrane is matte photoionization membrane. The metal filler has a size of 1 to 2 [mi]m in the thickness direction, a planar size of 3 to 9 [mu]m, and 3 to 5 bifurcations on theleaf-shaped metal filler; the ratio of the matrix resin to the metal filler of the electromagnetic wave reflective coating is 1:1.5 to 1 :5 The invention has better flexibility, bending resistance, product flatness and shielding effect.

Description

technical field [0001] The invention relates to the technical field of electromagnetic shielding, in particular to a reflective electromagnetic shielding film for FPC and a preparation method thereof. Background technique [0002] In the flexible printed circuit board (FPC) industry, with the upgrading of electronic devices such as smart phones and Ipads, the requirements for electromagnetic shielding are also getting higher and higher. Due to the processing technology and use requirements of FPC, the electromagnetic shielding film used on FPC must meet the following requirements: high temperature resistance (180°C, several hours, 270°C, short time), high pressure (12MPa), flexibility and bending resistance, 1000h constant temperature Constant humidity (85℃ temperature, 85% humidity), chemical resistance (acid, alkali, organic solvent), ultrasonic cleaning resistance. [0003] In the prior art, the electromagnetic shielding film has the following problems: (1) the insulatin...

Claims

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Application Information

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IPC IPC(8): H05K9/00C08J5/18C09D175/04C09D7/62C09D133/20C09D7/61C09D133/10C09D5/33C09D5/25
CPCC08J5/18C08K2003/085C08K2003/2241C09D5/00C09D5/004C09D7/61C09D7/62C09D133/20C09D175/04H05K9/0026C08K3/22C08K3/36C08K3/04C08L75/04C08L63/00C08K9/02C08K3/40C08K3/08
Inventor 刘仁成谢文波王绍亮洪腾郭磊
Owner SHENZHEN HONGHAI ELECTRON MATERIAL TECH CO LTD
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