Conductive silicone rubber

Abstract

The conductive silicone rubber comprises a porous polyurethane sponge framework and a metal layer attached to the surface of a porous polyurethane sponge framework base body, the metal layer is of a three-layer structure and comprises a metal nickel inner layer, a metal copper layer and a metal nickel outer layer, the metal nickel inner layer is attached to the surface of the porous polyurethane sponge framework, the metal copper layer is attached to the surface of the porous polyurethane sponge framework, and the metal nickel outer layer is attached to the surface of the porous polyurethane sponge framework. The metal copper layer is attached to the exterior of the metal nickel inner layer, the metal nickel outer layer is attached to the exterior of the metal copper layer, and gaps of the porous polyurethane sponge framework attached with the metal layer are filled with silicon rubber bodies. The conductive silicone rubber is small in size and resistivity, low in hardness, easy to form and process, resistant to high and low temperatures, resistant to aging, and excellent in conductivity and thermal stability. The method is especially suitable for manufacturing conductive silicone rubber products with good conductivity, complex shapes and fine structures.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of conductive glue, specifically relates to a conductive silicone rubber. BACKGROUND

[0002] The traditional conductive silicone rubber is prepared by adding conductive fillers and cross-linking agents into silicone rubber and then vulcanizing, and the commonly used glue is methyl vinyl silicone rubber, and the commonly used conductive fillers include acetylene black, carbon fiber, super-conductive carbon black, graphite, copper powder, silver powder, aluminum powder and zinc powder, etc. The conductive silicone rubber with the above structure is prepared by adding a large amount of conductive fillers into silicone rubber and then making the conductive particles contact through pressure, so as to achieve good conductivity. However, the application still has great limitations, for example, if the proportion of the added conductive fillers is small, the resistance will be large and the conductivity will be poor, and if the proportion of the added conductive fillers is large, the conductivity will be good, but the conductive silicone rubber will become hard and brittle, and the cost will also greatly increase. Therefore, we propose a new conductive silicone rubber for sealing and electromagnetic shielding. SUMMARY

[0003] In view of the above problems, the utility model aims at providing a conductive silicone rubber.

[0004] In order to achieve the above-mentioned purpose, the utility model realizes the following technical scheme: a conductive silicone rubber, comprising a porous polyurethane sponge framework and a metal layer attached to the surface of the porous polyurethane sponge framework base body, the metal layer is a three-layer structure, which is a metal nickel inner layer, a metal copper layer and a metal nickel outer layer, the metal nickel inner layer is attached to the surface of the porous polyurethane sponge framework, the metal copper layer is attached to the outside of the metal nickel inner layer, the metal nickel outer layer is attached to the outside of the metal copper layer, and the voids of the porous polyurethane sponge framework with the attached metal layer are filled with a silicone rubber body.

[0005] Further, the metal nickel inner layer is a conductive layer prepared by physical nickel plating on the surface of the porous polyurethane sponge framework.

[0006] Further, the metal copper layer is a conductive layer prepared by water electroplating copper on the surface of the metal nickel inner layer.

[0007] Further, the metal nickel outer layer is a conductive layer prepared by water electroplating nickel on the surface of the metal copper layer.

[0008] Further, the silicone rubber body is prepared by filling silicone rubber into all the void parts of the porous polyurethane sponge framework with the attached three-layer metal layer and then high-temperature vulcanization.

[0009] Further, the thickness of the conductive silicone rubber is 0.1-20mm.

[0010] Further, the electrically conductive silicone rubber preferably has a thickness of 1.0-12 mm.

[0011] Compared with the prior art, the utility model has the advantages of:

[0012] 1. The porous polyurethane sponge skeleton is made of porous polyurethane sponge with a three-dimensional structure, and is coated with three layers of metal by physical nickel plating, water-copper plating and water-nickel plating, and the gaps in the skeleton are filled with silicone rubber, so that the electrically conductive silicone rubber prepared by the above method has a small resistivity and a transverse resistance and a vertical resistance of less than or equal to 5Ω.

[0013] 2. The utility model has small volume, low hardness, easy forming, high and low temperature resistance (-100 to 350℃), aging resistance, excellent electrical conductivity and thermal stability, and is particularly suitable for manufacturing electrically conductive silicone rubber products with good electrical conductivity, complex shape and small structure. It can be widely used in the connection between printed circuits, radio integrated circuits and displays, and can save a lot of welding labor, simplify assembly, reduce volume and cost, and improve reliability. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a cross-sectional view of the porous polyurethane sponge scarf with three layers of metal attached in the utility model;

[0015] Figure 2 It is a cross-sectional view of the electrically conductive silicone rubber in the utility model;

[0016] Figure 3 It is an external structure diagram of the electrically conductive silicone rubber in the utility model;

[0017] In the figure: 1, porous polyurethane sponge skeleton, 2, metal nickel inner layer, 3, metal copper layer, 4, metal nickel outer layer, 5, silicone rubber body, 6, metal layer 6. DETAILED DESCRIPTION

[0018] The specific embodiments of the utility model will be further described in detail below with reference to the drawings.

[0019] As shown in Figure 1 , 2 , 3, the electrically conductive silicone rubber of the embodiment comprises a porous polyurethane sponge skeleton 1 and a metal layer 6 attached to the surface of the porous polyurethane sponge skeleton 1 substrate, the metal layer 6 has a three-layer structure, which is a metal nickel inner layer 2, a metal copper layer 3 and a metal nickel outer layer 4, the metal nickel inner layer 2 is attached to the surface of the porous polyurethane sponge skeleton 1, the metal copper layer 3 is attached to the outside of the metal nickel inner layer 2, and the metal nickel outer layer 4 is attached to the outside of the metal copper layer 3, and the gaps in the porous polyurethane sponge scarf with three layers of metal attached are filled with a silicone rubber body 5.

[0020] The conductive silicone rubber of the embodiment is prepared by the following steps:

[0021] 1. Place the porous polyurethane sponge matrix in a vacuum magnetron sputtering film coating device, set the temperature in the target cavity to 60-110 DEG C, set the polyurethane sponge matrix walking speed to 0.5-8 m / min, set the air charge to 100-300 sccm, adjust the sputtering required current, speed, and control the vacuum degree during sputtering, and after the sputtering process is completed, a metal nickel inner layer 2 conductive layer is attached to the skeleton 1 of the porous polyurethane sponge.

[0022] 2. A metal copper layer 3 conductive layer is prepared on the surface of the metal nickel inner layer 2 of step 1 by water electroplating copper, the plating solution pH value of the water electroplating copper is 8.2-9.2, and the temperature is 45-60 DEG C.

[0023] 3. A metal nickel outer layer 4 conductive layer is prepared on the surface of the metal copper layer 3 of step 2 by water electroplating nickel, the plating solution pH value of the water electroplating nickel is 3.5-5.5, and the temperature is 45-60 DEG C.

[0024] 4. Through the preparation of steps 1-3, a metal layer 6 composed of a metal nickel inner layer 2, a metal copper layer 3, and a metal nickel outer layer 4 is attached to the porous polyurethane sponge skeleton 1, and finally silicone rubber is filled into each gap hole of the porous polyurethane sponge skeleton 1, and then dried and vulcanized at a high temperature of 80-130 DEG C to obtain the conductive silicone rubber.

[0025] The utility model principle: adopt the conductive sponge of three -dimensional structure of porous with electromagnetic shielding function to do the skeleton, and the conductive sponge is prepared by the physical nickel plating, water electroplating copper and water electroplating nickel of polyurethane sponge, make the metal molecule of three -layer metal layer structure be connected together mutually tightly, form the electronic continuous state, when the outside electromagnetic field reaches the outside of conductive rubber, the strong electromagnetic wave hits on the conductive metal free electron, and the free electron forms the electromagnetic field opposite to the outside electromagnetic field in the free movement process, and the inside and outside electromagnetic field counteract each other, reach the effect of weakening electromagnetic interference wave.

[0026] The above only for the preferred embodiment of the utility model, and not for limiting the utility model, although the utility model has been described in detail with reference to the foregoing embodiment, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An electrically conductive silicone rubber, characterized in that, The porous polyurethane sponge framework (1) is provided with a metal layer (6) attached to the surface of the porous polyurethane sponge framework (1), the metal layer (6) is a three-layer structure, which is a metal nickel inner layer (2), a metal copper layer (3) and a metal nickel outer layer (4) in sequence, the metal nickel inner layer (2) is attached to the surface of the porous polyurethane sponge framework (1), the metal copper layer (3) is attached to the outside of the metal nickel inner layer (2), the metal nickel outer layer (4) is attached to the outside of the metal copper layer (3), and the space of the porous polyurethane sponge framework (1) to which the metal layer (6) is attached is filled with a silicone rubber body (5).

2. The conductive silicone rubber of claim 1, wherein, The metal nickel inner layer (2) is a conductive layer prepared by physical nickel plating on the surface of the porous polyurethane sponge framework (1).

3. The conductive silicone rubber of claim 2, wherein, The metal copper layer (3) is a conductive layer prepared by water electroplating copper on the surface of the metal nickel inner layer (2).

4. The conductive silicone rubber of claim 3, wherein, The metal nickel outer layer (4) is a conductive layer prepared by water electroplating nickel on the surface of the metal copper layer (3).

5. The conductive silicone rubber of claim 4, wherein, The silicone rubber body (5) is prepared by filling silicone rubber into the space of the porous polyurethane sponge framework (1) to which the three-layer metal layer is attached, and then high-temperature vulcanization.

6. The conductive silicone rubber of claim 1 wherein, The thickness of the conductive silicone rubber is 0.1-20mm.

7. The conductive silicone rubber of claim 6, wherein, The preferred thickness of the conductive silicone rubber is 1.0-12mm.

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