Conductive foam for electromagnetic shielding

Abstract

The utility model discloses conductive foam for electromagnetic shielding, and relates to the technical field of conductive foam improvement. The upper surface and the lower surface of the foam base layer are both coated with conductive adhesive layers, electromagnetic shielding layers are arranged on the outer surfaces of the conductive adhesive layers and provided with insulating layers, and the foam base layer, the conductive adhesive layers, the electromagnetic shielding layers and the insulating layers are wrapped by conductive cloth layers to form an integrated multi-layer composite structure. A plurality of carbon nanotubes are uniformly arranged in the foam base layer, the self-adhesive tape is attached to the edge of the conductive cloth layer, the surface of the electromagnetic shielding layer is coated with a metal coating, and positioning holes are formed in the four corners of the whole foam structure; the electromagnetic shielding material has good electromagnetic shielding performance, high physical performance and high structural stability, is suitable for different electronic devices, is made of materials with high safety and flame retardance, can be conveniently processed and installed in the electronic devices, can adapt to working environments with different intensities, can be tightly attached to the devices and has high structural stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to conductive foam improvement technical field, specifically related to a kind of electrically conductive foam sponge for electromagnetic shielding. BACKGROUND

[0002] Conductive foam is a kind of conductive cloth wrapped on flame-retardant sponge, after a series of processing, it is a kind of foam material with good surface conductivity. It is widely used in PDP television, LCD display, liquid crystal television, mobile phone, notebook computer, MP3, communication cabinet and other electronic products, for shielding electromagnetic interference, improving the performance and stability of equipment.

[0003] With the rapid development of electronic technology, the electromagnetic compatibility of electronic equipment is increasingly concerned. In electronic equipment, many components will produce electromagnetic radiation, and are also susceptible to external electromagnetic interference, affecting the normal operation and performance stability of equipment. Although the existing conductive foam can play a role in electromagnetic shielding to some extent, it still has problems such as insufficient shielding efficiency, poor structural stability, and insufficient tightness of equipment adhesion, so a conductive foam for electromagnetic shielding with better performance is needed to meet market demand. SUMMARY

[0004] The utility model discloses a kind of electrically conductive foam sponge for electromagnetic shielding, with good electromagnetic shielding performance, and physical performance is higher and suitable for different electronic equipment, itself material has higher safety flame-retardant performance, it is convenient to process and install in electronic equipment, and can adapt to different intensity working environment, can be closely attached with equipment, with higher structural stability.

[0005] To achieve the above object, the utility model adopts the following technical scheme: it contains foam base layer 1, conductive adhesive layer 2, electromagnetic shielding layer 3, insulating layer 4, conductive cloth layer 5, self-adhesive adhesive tape 6, nanometer carbon tube 7, metal coating 8, positioning hole 9;The upper and lower surfaces of the foam base layer 1 are coated with conductive adhesive layer 2, the outer surface of the conductive adhesive layer 2 is provided with electromagnetic shielding layer 3, the electromagnetic shielding layer 3 is provided with insulating layer 4, the conductive cloth layer 5 wraps the foam base layer 1, the conductive adhesive layer 2, the electromagnetic shielding layer 3 and the insulating layer 4 into an integrated multi-layer composite structure;The foam base layer 1 is uniformly provided with a plurality of nanometer carbon tubes 7 inside, the self-adhesive adhesive tape 6 is attached to the edge of the conductive cloth layer 5, the surface of the electromagnetic shielding layer 3 is coated with metal coating 8, and the overall foam structure is provided with positioning hole 9 in four corners, which is fixed and installed in cooperation with the mounting and fixing structure on the electronic equipment.

[0006] Further, the thickness of the foam base layer 1 is about 40%-50% of the entire foam thickness, the conductive adhesive layer 2 is relatively thin and uniformly covers the surface of the foam base layer 1, the thickness is about 0.1-0.2mm, the thickness of the electromagnetic shielding layer 3 is about 0.2-0.3mm, which is composed of tightly woven metalized fibers, the thickness of the insulating layer 4 is about 0.1-0.15mm, which is located outside the electromagnetic shielding layer 3, and the thickness of the conductive cloth layer 5 is about 0.1-0.2mm, which covers the surface of the insulating layer 4 and contacts with the outside.

[0007] Further, the self-adhesive adhesive tape 6 is a double-sided hot melt adhesive tape, the inner surface of the self-adhesive adhesive tape 6 is attached and fixed with the foam hot melt adhesive, and the outer surface of the self-adhesive adhesive tape 6 is covered with a peelable release paper.

[0008] Further, the nanometer carbon tube 7 is a straight tube-shaped multi-walled carbon nanotube.

[0009] Further, the metal coating 8 is a nickel-cobalt alloy chemical electroplating coating.

[0010] Further, the positioning hole 9 has a hole diameter of 2-5mm.

[0011] The working principle of the utility model is: compared with the traditional conductive foam, the foam base layer 1 in the utility model is uniformly added with a plurality of straight tube-shaped multi-walled carbon nanotubes, which provides high elasticity and toughness for the whole foam, and the electrical conductivity can reach 10 8 S·m -1 The surface of the electromagnetic shielding layer is coated with a nickel-cobalt alloy chemical electroplating coating to improve the conductivity and oxidation resistance of the limiting part and maintain long-term stable electromagnetic shielding performance.

[0012] After the above technical scheme is adopted, the utility model has the beneficial effects that: it adopts a multilayer composite structure, has good electromagnetic shielding performance, and has high physical performance suitable for different electronic equipment, has high safety and flame retardant performance, is convenient to process and install in electronic equipment, can adapt to different intensity working environments, can be closely attached to the equipment, has high structural stability, is very high in practicality and use value, and is suitable for batch production and popularization. DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor intensity.

[0014] Figure 1 is a structural schematic diagram of the utility model;

[0015] Figure 2 is a schematic diagram of the internal structure of the foam base layer 1 in the utility model;

[0016] Figure 3 is a schematic diagram of the surface structure of the electromagnetic shielding layer 3 in the utility model;

[0017] Figure 4 is a plan view corresponding to Figure 1 .

[0018] Mark explanation: foam base layer 1, conductive glue layer 2, electromagnetic shielding layer 3, insulating layer 4, conductive cloth layer 5, self-adhesive adhesive tape 6, nanometer carbon tube 7, metal coating 8, positioning hole 9. Specific implementation

[0019] Referring to Figures 1-4 , the technical scheme adopted in the specific implementation is: it contains foam base layer 1, conductive glue layer 2, electromagnetic shielding layer 3, insulating layer 4, conductive cloth layer 5, self-adhesive adhesive tape 6, nanometer carbon tube 7, metal coating 8, positioning hole 9; The upper and lower surfaces of the foam base layer 1 are coated with conductive glue layer 2, the outer surface of the conductive glue layer 2 is provided with electromagnetic shielding layer 3, the electromagnetic shielding layer 3 is provided with insulating layer 4, the conductive cloth layer 5 wraps the foam base layer 1, the conductive glue layer 2, the electromagnetic shielding layer 3 and the insulating layer 4 into an integrated multi-layer composite structure; The foam base layer 1 is uniformly provided with a plurality of nanometer carbon tubes 7, the self-adhesive adhesive tape 6 is attached to the edge of the conductive cloth layer 5, the surface of the electromagnetic shielding layer 3 is coated with metal coating 8, and the overall foam structure is provided with positioning holes 9 in the four corners, which are fixedly installed in cooperation with the mounting and fixing structure on the electronic equipment.

[0020] Further, the thickness of the foam base layer 1 is about 40%-50% of the overall foam thickness, which provides good elasticity and buffering performance for the foam. The conductive glue layer is relatively thin and uniformly covers the surface of the foam base layer, with a thickness of about 0.1-0.2 millimeters. The thickness of the shielding layer is about 0.2-0.3 millimeters, which is composed of tightly woven metalized fibers. The thickness of the insulating layer is about 0.1-0.15 millimeters, which is located on the outside of the shielding layer. The thickness of the conductive cloth layer is about 0.1-0.2 millimeters, which covers the surface of the insulating layer and contacts the outside world.

[0021] Further, the self-adhesive adhesive tape 6 is a double-sided hot melt adhesive tape, the inner surface of the self-adhesive adhesive tape 6 is attached and fixed with the foam hot melt adhesive, and the outer surface of the self-adhesive adhesive tape 6 is covered with a peelable release paper.

[0022] Further, the nanometer carbon tube 7 is a straight tube-shaped multi-walled carbon nanotube, which has extremely high elasticity and toughness, and the electrical conductivity can reach 10 8S·m -1 , and has extremely high thermal conductivity.

[0023] Further, the metal coating 8 is a nickel-cobalt alloy chemical electroplating coating, and the metalized fibers of the electromagnetic shielding layer 3 are subjected to surface modification treatment by using a chemical electroplating method, so as to improve the conductivity and oxidation resistance of the fibers, and enable the fibers to maintain stable electromagnetic shielding effectiveness during long-term use.

[0024] Further, the positioning hole 9 has a hole diameter of 2-5 mm, and when it is required to install the foam in the middle position between the metal structure and the electronic structure of the electronic equipment, the positioning hole 9 with a small hole diameter is used to conveniently fix the position, and then the self-adhesive adhesive tape 6 is used to cooperate with the fixing and installation, so as to be suitable for installation surfaces of various electronic equipment.

[0025] Compared with the traditional conductive foam, the foam base layer 1 in the utility model is internally and uniformly provided with a plurality of straight pipe-shaped multi-walled carbon nanotubes, so as to provide the foam with extremely high elasticity and toughness, and the electrical conductivity can reach 10 8 S·m -1 , and in order to facilitate installation, an opening and hot melt adhesive tape are combined and installed, so as to facilitate the installation of the foam in different electronic equipment.

[0026] In the preparation process of the foam base layer, a certain proportion of nanometer carbon tubes 7 are added. The nanometer carbon tubes 7 have extremely high conductivity and specific surface area, and can significantly improve the conductivity of the foam base layer 1, and further enhance the electromagnetic shielding effect of the entire conductive foam. Meanwhile, the metalized fibers of the electromagnetic shielding layer 3 are subjected to surface modification treatment, and a layer of ultra-thin nickel-cobalt alloy coating is plated on the surface of the fibers by using a chemical plating method, so as to improve the conductivity and oxidation resistance of the fibers, and enable the fibers to maintain stable electromagnetic shielding effectiveness during long-term use. The self-adhesive adhesive tape 6 is arranged on the edge of the conductive foam, and the surface of the adhesive tape is covered with peelable release paper. When used, the release paper is only peeled off, and then the conductive foam can be conveniently pasted on the surface of the equipment which needs electromagnetic shielding, so as to ensure close fitting, leave no gap, and improve the electromagnetic shielding effect. In addition, the positioning holes 9 are arranged on the four corners of the conductive foam, and by installing positioning columns on the corresponding positions of the surface of the equipment, the accuracy and stability of the installation of the conductive foam can be further improved, and displacement of the conductive foam during use can be prevented.

[0027] The above description is only used to illustrate the technical scheme of the utility model and not to limit it, and other modifications or equivalent replacements of the technical scheme of the utility model made by those skilled in the art should be covered in the claim range of the utility model.

Claims

1. An electrically conductive bubble pack for electromagnetic shielding, characterized by: It contains foam base layer (1), conductive glue layer (2), electromagnetic shielding layer (3), insulating layer (4), conductive cloth layer (5), self-adhesive tape (6), nanometer carbon tube (7), metal coating (8), positioning hole (9); the foam base layer (1) upper and lower surfaces are coated with conductive glue layer (2), the outer surface of the conductive glue layer (2) is provided with electromagnetic shielding layer (3), the electromagnetic shielding layer (3) is provided with insulating layer (4), the conductive cloth layer (5) wraps the foam base layer (1), the conductive glue layer (2), the electromagnetic shielding layer (3) and the insulating layer (4) into an integrated multi-layer composite structure; the foam base layer (1) is uniformly provided with a plurality of nanometer carbon tubes (7) inside, the self-adhesive tape (6) is attached to the edge of the conductive cloth layer (5), the surface of the electromagnetic shielding layer (3) is coated with the metal coating (8), and the whole foam structure is provided with positioning holes (9) in the four corners.

2. The conductive foam of claim 1, wherein: The foam base layer (1) is about 40%-50% of the thickness of the whole foam, the conductive glue layer (2) is relatively thin and uniformly covers the surface of the foam base layer (1), the thickness is about 0.1-0.2mm, the thickness of the electromagnetic shielding layer (3) is about 0.2-0.3mm, which is composed of tightly woven metalized fibers, the thickness of the insulating layer (4) is about 0.1-0.15mm, which is located outside the electromagnetic shielding layer (3), the thickness of the conductive cloth layer (5) is about 0.1-0.2mm, which covers the surface of the insulating layer (4) and contacts the outside world.

3. The conductive foam of claim 1, wherein: the conductive foam has a volume resistivity of 1 x 10"2 ohm-cm or less. The self-adhesive tape (6) is a double-sided hot melt adhesive tape, the inner surface of the self-adhesive tape (6) is attached and fixed with the foam hot melt adhesive, and the outer surface of the self-adhesive tape (6) is covered with a peelable release paper.

4. The conductive foam of claim 1, wherein: the conductive foam has a volume resistivity of 1 x 10"2 ohm-cm or less. The nanometer carbon tube (7) is a straight tube-shaped multi-walled carbon nanotube.

5. The conductive foam of claim 1, wherein: the conductive foam has a volume resistivity of 1 x 10"2 ohm-cm or less. The metal coating (8) is a nickel-cobalt alloy chemical electroplating coating.

6. The conductive foam of claim 1, wherein: The positioning hole (9) has a hole diameter of 2-5mm.

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