Electromagnetic shielding conductive adhesive material and preparation method thereof

Abstract

The present invention belongs to the field of conductive adhesive technology, especially an electromagnetic shielding conductive adhesive material and its preparation method. The following scheme is proposed, which specifically includes a baseband, an outer flame retardant layer, an outer adhesive layer, an outer shielding bracket, a conductive adhesive layer, an inner shielding bracket, an inner adhesive layer, an inner flame retardant layer and a glue layer arranged in sequence from the outside to the inside. The outer shielding bracket and the inner shielding bracket are metal woven honeycomb mesh structures, and the conductive adhesive layer is coated between the outer shielding bracket and the inner shielding bracket. The inner part of the mesh of the outer shielding bracket and the inner shielding bracket is filled on both sides of the conductive adhesive layer to form a filling part. In the present invention, the inner part of the mesh of the outer shielding bracket and the inner shielding bracket is filled on both sides of the conductive adhesive layer to form a filling part. When pressed, the conductive adhesive layer penetrates into the gap between the outer adhesive layer and the inner adhesive layer composed of conductive foam to form a stable shielding layer without dead angles. It is used in electronic products and information collection and transmission parts, a single set of parts, and a shielding and shielding effect.

Description

Technical Field

[0001] The invention relates to the technical field of conductive adhesives, and in particular to an electromagnetic shielding conductive adhesive material and a preparation method thereof. Background Art

[0002] Conductive adhesive is an adhesive that has a certain conductivity after curing or drying. It can connect a variety of conductive materials together to form an electrical path between the connected materials. In the electronics industry, conductive adhesive has become an indispensable new material. There are many varieties of conductive adhesives. From the perspective of application, conductive adhesives can be divided into two categories: general conductive adhesives and special conductive adhesives. General conductive adhesives only have certain requirements for the conductive properties and bonding strength of conductive adhesives. In addition to certain requirements for conductive properties and bonding strength, special conductive adhesives also have some special requirements. Such as high temperature resistance, ultra-low temperature resistance, instant curing, anisotropy and transparency.

[0003] Electronic devices are composed of integrated circuits, transistors, electron tubes and other electronic components. Electronic devices will generate magnetic fields when in use, which can easily interfere with the application stability of surrounding equipment. Electromagnetic shielding can prevent electronic devices from interfering with other devices and being unaffected by other devices. The current conductive adhesive materials have magnetic conductivity, and magnetic conductive adhesives will form magnetic fields that affect each other.

[0004] In view of this, the present invention provides an electromagnetic shielding conductive adhesive material and a preparation method thereof to solve the technical problems existing in the above-mentioned prior art. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes an electromagnetic shielding conductive adhesive material and a preparation method thereof.

[0006] The present invention proposes an electromagnetic shielding conductive adhesive material, comprising a baseband, an outer flame retardant layer, an outer adhesive layer, an outer shielding bracket, a conductive adhesive layer, an inner shielding bracket, an inner adhesive layer, an inner flame retardant layer and a glue layer, which are arranged in sequence from the outside to the inside. The outer shielding bracket and the inner shielding bracket are metal woven honeycomb mesh structures, and the conductive adhesive layer is coated between the outer shielding bracket and the inner shielding bracket. The inner parts of the meshes of the outer shielding bracket and the inner shielding bracket are filled on both sides of the conductive adhesive layer to form a filling part.

[0007] Preferably in the present invention, the conductive adhesive layer is composed of non-magnetic conductive powder mixed with silicone epoxy resin and graphene powder.

[0008] Preferably in the present invention, the non-magnetic conductive powder is formed by silver-plating non-magnetic metal balls, and the particle size range of the non-magnetic conductive powder is 5-35 μm.

[0009] In the present invention, preferably, the outer rubber layer and the inner rubber layer are both made of conductive foam.

[0010] Preferably in the present invention, the conductive foam is formed by mixing and foaming polyethylene, conductive carbon black, a foaming agent and a cross-linking agent.

[0011] In the present invention, preferably, the outer flame retardant layer is made of flame retardant non-woven fabric.

[0012] Preferably in the present invention, the inner flame retardant layer is made of conductive cloth, which is one of nickel-plated conductive cloth, gold-plated conductive cloth, carbon-plated conductive cloth and aluminum foil fiber composite cloth.

[0013] Preferably in the present invention, the outer surface of the base tape is coated with a release film layer.

[0014] A method for preparing an electromagnetic shielding conductive adhesive material comprises the following steps:

[0015] S: bonding the base tape to the outer flame retardant layer, coating the outer rubber layer on the inner side of the outer flame retardant layer by extrusion equipment, and pressing and fixing the outer shielding bracket in the outer rubber layer to form an outer tape body;

[0016] S: An inner rubber layer is applied to the side of the inner flame retardant layer by an extrusion device, and an inner shielding bracket is pressed and fixed to the inner rubber layer to form an inner belt body;

[0017] S: Press the outer belt body and the inner belt body together, and at the same time, fill the conductive adhesive layer between the outer belt body and the inner belt body through an extrusion device to ensure that the conductive adhesive layer fully fills the surface gap between the outer shielding bracket and the inner shielding bracket;

[0018] S: A release adhesive is coated on the other side of the inner flame retardant layer to form a glue layer, and after curing, it is cut into a strip-shaped electromagnetic shielding conductive tape.

[0019] Compared with the prior art, the present invention provides an electromagnetic shielding conductive adhesive material and a preparation method thereof, which has the following beneficial effects:

[0020] The conductive adhesive layer in the conductive adhesive material is silver-plated with non-magnetic metal balls to form a non-magnetic conductive powder. The conductive adhesive layer is coated between the outer shielding bracket and the inner shielding bracket. The inner part of the mesh of the outer shielding bracket and the inner shielding bracket is filled on both sides of the conductive adhesive layer to form a filling part. The conductive adhesive layer will also penetrate into the gap between the outer adhesive layer and the inner adhesive layer composed of conductive foam during pressing to form a stable shielding layer without dead angles. It is used in electronic products, information collection and transmission parts, and single-group parts to achieve shielding and shielding effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of an electromagnetic shielding conductive adhesive material proposed by the present invention;

[0022] In the figure: 1 base tape, 2 outer flame retardant layer, 3 outer rubber layer, 4 outer shielding bracket, 5 filling part, 6 conductive rubber layer, 7 inner shielding bracket, 8 inner rubber layer, 9 inner flame retardant layer, 10 glue layer. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] Reference Figure 1 , an electromagnetic shielding conductive adhesive material, comprising a baseband 1, an outer flame retardant layer 2, an outer adhesive layer 3, an outer shielding bracket 4, a conductive adhesive layer 6, an inner shielding bracket 7, an inner adhesive layer 8, an inner flame retardant layer 9 and a glue layer 10 which are arranged in sequence from the outside to the inside, the outer shielding bracket 4 and the inner shielding bracket 7 are metal woven honeycomb mesh structures, and the conductive adhesive layer 6 is coated between the outer shielding bracket 4 and the inner shielding bracket 7, and the inner mesh of the outer shielding bracket 4 and the inner shielding bracket 7 is filled on both sides of the conductive adhesive layer 6 to form a filling part 5, the conductive adhesive layer 6 is composed of a non-magnetic conductive powder mixed with a silicone epoxy resin and a graphene powder, the non-magnetic conductive powder is formed by silver plating a non-magnetic metal ball, and the particle size range of the non-magnetic conductive powder is 5-35μm, and the conductive adhesive layer 6 will also penetrate into the gap between the outer adhesive layer 3 and the inner adhesive layer 8 composed of conductive foam during pressing.

[0025] As a further solution of the present invention, the outer rubber layer 3 and the inner rubber layer 8 are both made of conductive foam, which is composed of a mixture of polyethylene, conductive carbon black, a foaming agent and a cross-linking agent, forming dense gap spaces on the surfaces of the outer rubber layer 3 and the inner rubber layer 8.

[0026] As a further solution of the present invention, the outer flame retardant layer 2 is made of flame retardant non-woven fabric, and the inner flame retardant layer 9 is made of conductive fabric, which is one of nickel-plated conductive fabric, gold-plated conductive fabric, carbon-plated conductive fabric and aluminum foil fiber composite fabric.

[0027] As a further solution of the present invention, the outer surface of the base tape 1 is coated with a release film layer.

[0028] A method for preparing an electromagnetic shielding conductive adhesive material comprises the following steps:

[0029] S1: bonding the base tape 1 to the outer flame retardant layer 2, coating the outer rubber layer 3 on the inner side of the outer flame retardant layer 2 by extrusion equipment, and pressing and fixing the outer shielding bracket 4 in the outer rubber layer 3 to form an outer tape body;

[0030] S2: coating the inner rubber layer 8 on the side of the inner flame retardant layer 9 by extrusion equipment, and pressing and fixing the inner shielding bracket 7 on the inner rubber layer 8 to form an inner belt body;

[0031] S3: Pressing the outer belt body and the inner belt body together, and at the same time, filling the conductive adhesive layer 6 between the outer belt body and the inner belt body through an extrusion device to ensure that the conductive adhesive layer 6 fully fills the surface gap between the outer shielding bracket 4 and the inner shielding bracket 7;

[0032] S4: coating the other side of the inner flame retardant layer 9 with a release adhesive to form an adhesive layer 10, and cutting the adhesive layer 10 after curing to form a strip-shaped electromagnetic shielding conductive adhesive tape.

[0033] This conductive adhesive is made of non-magnetic metal balls plated with silver to form non-magnetic conductive powder, and is used in electronic products, information collection and transmission parts, single-group parts, and shielding and covering effects. The conductive adhesive layer 6 in the conductive adhesive material is plated with silver by non-magnetic metal balls to form non-magnetic conductive powder, and the conductive adhesive layer 6 is coated on the outer shielding bracket 4 and the inner shielding bracket 7. The inner part of the mesh of the outer shielding bracket 4 and the inner shielding bracket 7 is filled on both sides of the conductive adhesive layer 6 to form a filling part 5, and the conductive adhesive layer 6 will also penetrate into the gap between the outer adhesive layer 3 and the inner adhesive layer 8 composed of conductive foam during pressing, forming a stable shielding layer without dead angles.

[0034] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electromagnetic shielding conductive adhesive material, comprising a base tape (1), an outer flame retardant layer (2), an outer adhesive layer (3), an outer shielding bracket (4), a conductive adhesive layer (6), an inner shielding bracket (7), an inner adhesive layer (8), an inner flame retardant layer (9) and a glue layer (10) arranged in sequence from the outside to the inside, characterized in that: The outer shielding support (4) and the inner shielding support (7) are of a metal woven honeycomb mesh structure, and a conductive adhesive layer (6) is coated between the outer shielding support (4) and the inner shielding support (7), and the inner mesh of the outer shielding support (4) and the inner shielding support (7) is filled on both sides of the conductive adhesive layer (6) to form a filling part (5).

2. The electromagnetic shielding conductive adhesive material according to claim 1, characterized in that: The conductive adhesive layer (6) is composed of a mixture of non-magnetic conductive powder, silicone epoxy resin and graphene powder.

3. The electromagnetic shielding conductive adhesive material according to claim 2, characterized in that: The non-magnetic conductive powder is formed by silver-plating non-magnetic metal balls, and the particle size range of the non-magnetic conductive powder is 5-35 μm.

4. The electromagnetic shielding conductive adhesive material according to claim 1, characterized in that: The outer rubber layer (3) and the inner rubber layer (8) are both made of conductive foam.

5. The electromagnetic shielding conductive adhesive material according to claim 4, characterized in that: The conductive foam is formed by mixing and foaming polyethylene, conductive carbon black, a foaming agent and a cross-linking agent.

6. The electromagnetic shielding conductive adhesive material according to claim 1, characterized in that: The outer flame retardant layer (2) is made of flame retardant non-woven fabric.

7. The electromagnetic shielding conductive adhesive material according to claim 1, characterized in that: The inner flame retardant layer (9) is made of conductive cloth, which is one of nickel-plated conductive cloth, gold-plated conductive cloth, carbon-plated conductive cloth and aluminum foil fiber composite cloth.

8. The electromagnetic shielding conductive adhesive material according to claim 1, characterized in that: The outer surface of the base tape (1) is coated with a release film layer.

9. A method for preparing the electromagnetic shielding conductive adhesive material according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: bonding the base tape (1) to the outer flame retardant layer (2), coating the outer rubber layer (3) on the inner side of the outer flame retardant layer (2) by extrusion equipment, and pressing and fixing the outer shielding bracket (4) in the outer rubber layer (3) to form an outer tape body; S2: coating an inner rubber layer (8) on the side of the inner flame retardant layer (9) by an extrusion device, and pressing and fixing the inner shielding bracket (7) on the inner rubber layer (8) to form an inner belt body; S3: pressing the outer belt body and the inner belt body together, and at the same time, filling a conductive adhesive layer (6) between the outer belt body and the inner belt body through an extrusion device, ensuring that the conductive adhesive layer (6) fully fills the surface gap between the outer shielding bracket (4) and the inner shielding bracket (7); S4: coating the other side of the inner flame retardant layer (9) with a release adhesive to form an adhesive layer (10), and cutting the adhesive layer (10) after curing to form a strip-shaped electromagnetic shielding conductive adhesive tape.

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