A vertical conductive adhesive and preparation method thereof

Abstract

The present application relates to the technical field of conductive adhesives, and more specifically, to a vertical conductive adhesive and a preparation method thereof. A vertical conductive adhesive, the vertical conductive adhesive includes at least one group of conductive units, the conductive units include two layers of base layers and a conductive layer arranged between the two layers of the base layers; the base layer includes the following materials in parts by weight: 100-200 parts of methyl vinyl silicone rubber raw rubber, 40-150 parts of white carbon black, 0.15-4 parts of platinum catalyst, 1-5 parts of hydrogen-containing silicone oil, 0.05-2 parts of inhibitors and 0-15 parts of silane coupling agents. The base layer is prepared by preparing methyl vinyl silicone rubber raw rubber, white carbon black, platinum catalyst, hydrogen-containing silicone oil, inhibitor and silane coupling agent, so that the base layer has good elasticity and high temperature resistance, and then the conductive part is combined with the base layer to form a vertical conductive adhesive, which can further improve the resilience and high temperature resistance of the vertical conductive adhesive.

Description

Technical Field

[0001] The present application relates to the technical field of conductive adhesives, and more specifically, to a vertical conductive adhesive and a preparation method thereof. Background Art

[0002] Vertical conductive adhesive is composed of silica gel and metal ions. The conduction is conducted by metal ions. It is non-conductive when not under vertical pressure, and has high resistance or almost no conductivity in other directions. Vertical conductive adhesive is currently widely used in electronic components, optical components, displays, and packaging connections.

[0003] At present, anisotropic conductive adhesive is composed of polymer resin matrix, conductive filler and some other additives. In the process of preparing vertical conductive adhesive, the conductive filler is evenly distributed in the polymer resin matrix. During the molding process, it needs to be compressed by great pressure to have conductivity. The great pressure will cause the conductive filler to move with the flow of the resin matrix, so there will be uneven conductive filler in a certain local range (spacing and line width comparable range), which makes the vertical conductive adhesive poor in elasticity and high temperature resistance. Summary of the invention

[0004] In order to improve the problems of poor elasticity and high temperature resistance of vertical conductive adhesive, the present application provides a vertical conductive adhesive and a preparation method thereof.

[0005] In a first aspect, the present application provides a vertical conductive adhesive, which adopts the following technical solution:

[0006] A vertical conductive adhesive, comprising at least one group of conductive units, wherein the conductive units include two base layers and a conductive layer disposed between the two base layers; the base layer is prepared by the following materials in parts by weight:

[0007] Methyl vinyl silicone rubber raw rubber 100-200 parts

[0008] 40-150 parts of white carbon black

[0009] Platinum catalyst 0.15-4 parts

[0010] 1-5 parts of hydrogen silicone oil

[0011] Inhibitor 0.05-2 parts

[0012] Silane coupling agent 0-15 parts.

[0013] By adopting the above technical solution, the vertical conductive adhesive prepared has good vertical conductive performance, elasticity and high temperature resistance. Among them, in this application, by preparing the base layer with methyl vinyl silicone rubber, white carbon black, platinum catalyst, hydrogen-containing silicone oil, inhibitor and silane coupling agent, the base layer has good elasticity and high temperature resistance, which can further improve the resilience and high temperature resistance of the vertical conductive adhesive; then the conductive part is combined with the base layer to form a vertical conductive adhesive, and the conductive filler is reduced by the combination. The movement of the conductive filler with the flow of the resin matrix is ​​reduced to prevent the uneven conductive filler, thereby improving the elasticity of the vertical conductive adhesive and improving the high temperature resistance effect.

[0014] Preferably, the conductive layer is formed by metal wires equidistantly laid on the surface of the base layer.

[0015] By adopting the above technical solution, the base layer can tightly wrap the metal wire, so that the metal wire is not easily broken or falls off from the base layer. The metal wire has poor resilience and is easy to break. When used to prepare vertical conductive adhesive, it will reduce the resilience of the vertical conductive adhesive. In this regard, in this application, the metal wires are evenly laid on the surface of the base layer so that the metal wires are located between two adjacent base layers. Under the pressure, the base layer can tightly wrap the metal wires. With the protection of the base layer, the metal wires are not easily broken, and the resilience and high temperature resistance of the vertical conductive adhesive are not affected.

[0016] Preferably, the metal wire is a modified metal wire, which is prepared by the following method:

[0017] A: Soak the metal wire in a phosphoric acid solution, perform ultrasound, add ferric chloride and chitosan, perform ultrasound, filter, and dry to obtain chitosan-metal wire;

[0018] B: Chitosan-metal wire and silane coupling agent are added into anhydrous ethanol at the same time, ultrasonicated, and then heated until the anhydrous ethanol is completely evaporated to obtain modified metal wire.

[0019] The metal wire itself is not sticky and is directly laid flat on the surface of the base layer. The adhesion between the metal wire and the base layer is poor, and it is easy to shift, which increases the scrap rate of the vertical conductive adhesive. In this regard, the present application further improves the adhesion between the metal wire and the base layer by modifying the metal wire, and also protects the metal wire so that the metal wire is not easy to break during use. The modified metal wire is stably connected to further improve the problem of easy breakage and poor resilience of the metal wire, thereby improving the resilience and high temperature resistance of the vertical conductive adhesive.

[0020] Preferably, the mass fraction of the phosphoric acid solution is 20-30%.

[0021] Preferably, the weight parts of the raw materials used for the modified metal wire are as follows:

[0022] Conductive filler 10-20 parts

[0023] Phosphoric acid solution 20-40 parts

[0024] 2-5 parts of ferric chloride

[0025] Chitosan 5-10 parts

[0026] Silane coupling agent 1-2 parts

[0027] 10-15 parts of anhydrous ethanol.

[0028] By adopting the above technical solution, the amount of raw materials used in the preparation of the modified metal wire is optimized, and the bonding performance between the metal wire and the base layer is further improved, so that the metal wire and the base layer are stably connected and not easily separated, thereby improving the structural stability of the vertical conductive adhesive and enabling long-term use.

[0029] Preferably, the metal wire is at least one of gold-plated silver wire, silver-plated copper wire and silver wire.

[0030] By adopting the above metal wire, the vertical conductive performance of the vertical conductive adhesive is further improved.

[0031] Preferably, the diameter of the metal wire is 10-50um

[0032] By adopting the above technical solution, the diameter of the metal wire is optimized and the thickness ratio of the base layer to the conductive layer is increased. The base layer can tightly wrap the metal wire, thereby maintaining good resilience and vertical conductivity of the vertical conductive adhesive.

[0033] Preferably, the conductive layer is prepared by comprising the following materials in parts by weight:

[0034] Methyl vinyl silicone rubber raw rubber 50-200 parts

[0035] White carbon black 10-100 parts

[0036] Platinum catalyst 0.1-4 parts

[0037] 1-5 parts of hydrogen silicone oil

[0038] Inhibitor 0.05-2 parts

[0039] Silane coupling agent 0-15 parts

[0040] Conductive filler 70-300 parts.

[0041] By adopting the above technical solution, the prepared conductive layer has good conductivity, resilience and high temperature resistance, and can be stably connected with the base layer. The conductive layer and the base layer have the same substance and can be stably connected. The conductive layer and the base layer exist independently, so that the conductive filler will not move with the flow of methyl vinyl silicone rubber during the pressing process, so that the conductive filler can be evenly distributed in the conductive layer system.

[0042] Preferably, the silane coupling agent is at least one of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane or methacryloxysilane.

[0043] Preferably, the inhibitor is one of acetylenic alcohol, diphenylsilanediol, methylphenyldiethoxysilane or tetramethylethylenedioxydimethylsilane.

[0044] Preferably, the viscosity of the hydrogen-containing silicone oil is (at 25°C) 10-50 mm 2 / s, with a hydrogen content of 1.5-2.5%.

[0045] By adopting the above technical solution, the performance of hydrogen-containing silicone oil is optimized, and the resilience and high temperature resistance of the base layer and the conductive layer are further improved.

[0046] Preferably, the density of the methyl vinyl silicone rubber raw rubber is 0.9-1.2 g / ml, the vinyl content is 0.19-0.24%, the cone penetration is 600-900 (1 / 10 mm), and the molecular weight is 600,000-680,000.

[0047] By adopting the above technical solution, the performance of the methyl vinyl silicone rubber raw rubber is further optimized, so that the base layer and the conductive layer have good resilience and high temperature resistance, and the resilience and high temperature resistance of the vertical conductive glue are improved.

[0048] In a second aspect, the present application provides a method for preparing a vertical conductive adhesive, which adopts the following technical solution:

[0049] A method for preparing a vertical conductive adhesive comprises the following steps:

[0050] S1. Mix methyl vinyl silicone rubber, white carbon black, platinum catalyst, hydrogenated silicone oil, inhibitor and silane coupling agent in parts by weight to prepare a mixture A, and then preform the mixture A into a plurality of substrates;

[0051] S2. Lay metal wires vertically and evenly on the surface of one of the sheets, then lay another layer of sheet, and then lay thin wires in the same way, and then lay another layer of substrate, repeat this process at least 100 times, and then mold and vulcanize the stacked samples at a vulcanization condition of 115-125°C for 600-800s to obtain a vertical conductive adhesive block, which is then cut to obtain a vertical conductive adhesive.

[0052] By adopting the above technical solution, the vertical conductive adhesive prepared has good vertical conductive performance, resilience and high temperature resistance.

[0053] In a third aspect, the present application provides a method for preparing a vertical conductive adhesive, which adopts the following technical solution:

[0054] A method for preparing a vertical conductive adhesive comprises the following steps:

[0055] S1. Mix methyl vinyl silicone rubber, white carbon black, platinum catalyst, hydrogenated silicone oil, inhibitor and silane coupling agent in parts by weight to prepare a mixture A, and then preform the mixture A into a plurality of substrates;

[0056] S2. Mixing methyl vinyl silicone rubber, white carbon black, platinum catalyst, hydrogen-containing silicone oil, inhibitor, silane coupling agent and conductive filler according to parts by weight to prepare several conductive sheets;

[0057] S3. Lay the conductive sheet on the surface of the substrate, and then lay the substrate on the surface of the conductive sheet, and repeat this process for at least 100 times. Then, mold and vulcanize the stacked samples at a vulcanization condition of 115-125°C for 600-800s to obtain a vertical conductive adhesive block, which is then cut to obtain a vertical conductive adhesive.

[0058] By adopting the above technical solution, the vertical conductive adhesive prepared has good vertical conductive performance, resilience and high temperature resistance.

[0059] In summary, this application has the following beneficial effects:

[0060] 1. The vertical conductive adhesive in the present application is made of at least two layers of base layers and a conductive layer disposed between the two layers of base layers, wherein the base layer is prepared from methyl vinyl silicone rubber, white carbon black, platinum catalyst, hydrogenated silicone oil, inhibitor and silane coupling agent. The base layer prepared by the above formula has good elasticity and high temperature resistance, which can further improve the resilience and high temperature resistance of the vertical conductive adhesive; the conductive part is combined with the base layer to form a vertical conductive adhesive, and the conductive filler is reduced by the combination to move with the flow of the resin matrix, and the conductive filler is prevented from being uneven, thereby improving the elasticity of the vertical conductive adhesive and improving the high temperature resistance.

[0061] 2. In the present application, the metal is first modified, and then the modified metal wires are evenly spread on the surface of the base layer at equal distances to improve the bonding force between the metal wires and the base layer, and at the same time, the metal wires are protected so that the metal wires are not easily broken during use. At the same time, the resilience and high temperature resistance of the vertical conductive adhesive can also be improved. 3. A conductive layer is prepared by combining methyl vinyl silicone rubber, white carbon black, platinum catalyst, hydrogen-containing silicone oil, inhibitor, silane coupling agent and thermal conductive filler, and then the conductive layer and the base layer are prepared to have good conductivity, resilience and high temperature resistance, and can be stably connected to the base layer. Among them, the conductive layer and the base layer contain the same substance and can be stably connected. The conductive layer and the base layer exist independently, so that the conductive filler will not move with the flow of methyl vinyl silicone rubber during the pressing process, so that the conductive filler can be evenly distributed in the conductive layer system. DETAILED DESCRIPTION

[0062] Preparation Example 1-3

[0063] Preparation Example 1

[0064] A modified conductive filler is prepared by the following preparation method:

[0065] A: 1 kg of metal wire was immersed in 2 kg of 20% phosphoric acid solution, ultrasonicated, 0.2 kg of ferric chloride and 0.5 kg of chitosan were added, ultrasonicated, filtered, and dried to obtain chitosan-metal wire;

[0066] B: Add chitosan-metal wire and 0.1 kg of silane coupling agent into 1 kg of anhydrous ethanol at the same time, ultrasonicate, and heat until the anhydrous ethanol is completely evaporated to obtain a modified metal wire.

[0067] The metal wire is a silver wire, and the length of the silver wire is 50um.

[0068] The silane coupling agent is methacryloxysilane.

[0069] The difference between Preparation Example 2-3 and Preparation Example 1 is that the dosage of some raw materials and experimental parameters are different, and the rest of the experimental steps are consistent with Preparation Example 1. The materials and dosages used in Preparation Examples 1-3 are shown in Table 1:

[0070] Table 1 Materials and amounts used in Preparation Examples 1-3

[0071]

[0072] Preparation Example 4-6

[0073] Preparation Example 4

[0074] A conductive sheet is prepared by the following method:

[0075] 0.5 kg of methyl vinyl silicone rubber, 0.1 kg of white carbon black, 0.001 kg of platinum catalyst, 0.01 kg of hydrogen-containing silicone oil, 0.005 kg of inhibitor and 0.7 kg of conductive filler were mixed and pressed to prepare several conductive sheets.

[0076] The conductive filler is silver powder.

[0077] The viscosity of hydrogen silicone oil is (at 25°C) 10 mm 2 / s, with a hydrogen content of 1.5%.

[0078] The density of methyl vinyl silicone rubber raw rubber is 0.9g / ml, the vinyl content is 0.19%, the cone penetration is 600 (1 / 10mm), and the molecular weight is 600,000.

[0079] The inhibitor is diphenylsilanediol.

[0080] The difference between Preparation Example 5-6 and Preparation Example 4 is that the dosage of some raw materials and experimental parameters are different, and the remaining experimental steps are consistent with Preparation Example 4.

[0081] The silane coupling agent is methacryloxysilane.

[0082] The materials and amounts used in Preparation Examples 4-6 are shown in Table 2:

[0083] Table 2 Materials and amounts used in Preparation Examples 4-6

[0084]

[0085]

[0086] Example

[0087] Example 1

[0088] A vertical conductive adhesive is prepared by the following method:

[0089] S1, 1 kg of methyl vinyl silicone rubber, 0.4 kg of white carbon black, 0.0015 kg of platinum catalyst, 0.011 kg of hydrogen-containing silicone oil, 0.0005 kg of inhibitor and 0.01 kg of silane coupling agent are mixed to prepare a mixture A, and then the mixture A is preformed into a plurality of substrates;

[0090] S2. Lay metal wires vertically and evenly on the surface of one of the sheets, then lay another layer of sheet, then lay thin wires in the same way, and then lay another layer of sheet, repeat this process 100 times, and then mold and vulcanize the stacked samples at a vulcanization condition of 115-125°C for 600-800s to obtain a vertical conductive adhesive block, which is then cut to obtain a vertical conductive adhesive.

[0091] The metal wire is a silver wire, and the length of the silver wire is 50um.

[0092] The viscosity of hydrogen silicone oil is (at 25°C) 10 mm 2 / s, with a hydrogen content of 1.5%.

[0093] The density of methyl vinyl silicone rubber raw rubber is 0.9g / ml, the vinyl content is 0.19%, the cone penetration is 600 (1 / 10mm), and the molecular weight is 600,000.

[0094] The inhibitor is diphenylsilanediol.

[0095] The silane coupling agent is methacryloxysilane.

[0096] The difference between Example 2-4 and Example 1 is that the source of the metal wire is different from that in Example 1, the amount of some raw materials is different from that in Example 1, and the remaining test steps are the same as those in Example 1.

[0097] The specific differences between Examples 1-4 are shown in Table 3:

[0098] Table 3 Amount of each raw material in Examples 1-4

[0099]

[0100]

[0101] Example 5

[0102] A vertical conductive adhesive is prepared by the following method:

[0103] S1, 1 kg of methyl vinyl silicone rubber, 0.4 kg of white carbon black, 0.0015 kg of platinum catalyst, 0.011 kg of hydrogen-containing silicone oil, 0.0005 kg of inhibitor and 0.01 kg of silane coupling agent are mixed to prepare a mixture A, and then the mixture A is preformed into a plurality of substrates;

[0104] S2, the conductive sheet is from Preparation Example 4;

[0105] S3. Lay the conductive sheet flat on the surface of the substrate, and then lay the substrate flat on the surface of the conductive sheet, and repeat this process 100 times. Then, mold and vulcanize the stacked samples at 115°C for 600s to obtain vertical conductive adhesive blocks, which are then cut to obtain vertical conductive adhesive.

[0106] The viscosity of hydrogen silicone oil is (at 25°C) 10 mm 2 / s, with a hydrogen content of 1.5%.

[0107] The density of methyl vinyl silicone rubber raw rubber is 0.9g / ml, the vinyl content is 0.19%, the cone penetration is 600 (1 / 10mm), and the molecular weight is 600,000.

[0108] The silane coupling agent is methacryloxysilane.

[0109] Example 6

[0110] A vertical conductive adhesive. The difference between this embodiment and Example 5 is that the conductive sheet comes from Preparation Example 5, and the remaining raw material types, amounts and experimental steps are consistent with Example 5.

[0111] Example 7

[0112] A vertical conductive adhesive. The difference between this embodiment and embodiment 7 is that the conductive sheet comes from preparation example 6, and the remaining raw material types, amounts and experimental steps are consistent with embodiment 5.

[0113] Comparative Example

[0114] Comparative Example 1

[0115] A vertical conductive adhesive. The difference between this embodiment and embodiment 1 is that methyl phenyl vinyl silicone rubber raw rubber is used to replace an equal amount of methyl vinyl silicone rubber raw rubber, and the remaining raw material types, amounts and experimental steps are consistent with those in embodiment 1.

[0116] The phenyl vinyl silicone rubber raw rubber has a phenylene content of 5%, a vinyl content of 0.19% and a molecular weight of 400,000.

[0117] Comparative Example 2

[0118] A vertical conductive adhesive. The difference between this embodiment and embodiment 5 is that methyl phenyl vinyl silicone rubber raw rubber is used to replace an equal amount of methyl vinyl silicone rubber raw rubber, and the remaining raw material types, amounts and experimental steps are consistent with embodiment 1.

[0119] The phenyl vinyl silicone rubber raw rubber has a phenylene content of 5%, a vinyl content of 0.19% and a molecular weight of 400,000.

[0120] Performance testing

[0121] The vertical resistivity, operating temperature, hardness, tensile strength, elongation at break, compression set and high temperature resistance test of the vertical conductive adhesives prepared in Examples 1-7 and Comparative Example 1 were tested.

[0122] Detection method / test method

[0123] Vertical resistivity: Refer to MIL-DTL-83528.

[0124] Operating temperature: refer to ASTM D1329.

[0125] Hardness: Refer to ASTMD2240.

[0126] Light tensile strength: Refer to ASTMD412.

[0127] Elongation at break: refer to ASTMD412.

[0128] Compression set: refer to ASTMD395.

[0129] The test data are shown in Table 4:

[0130] Table 4 Performance test data

[0131]

[0132]

[0133] It can be seen from Examples 1-7 and Comparative Examples 1-2 in combination with Table 4 that the vertical conductive adhesive prepared by the preparation method of the present application has good vertical conductive performance, resilience and high temperature resistance.

[0134] Compared with Comparative Example 1, Example 1 adopts the base layer prepared by methyl vinyl silicone rubber raw rubber, white carbon black, platinum catalyst, hydrogen-containing silicone oil, inhibitor and silane coupling agent in the present application, and then uses the base layer and metal wire to prepare vertical conductive adhesive with good vertical conductivity, resilience and high temperature resistance.

[0135] Compared with Example 1, the hardness, tensile strength and elongation at break of Example 2 are all greater than those of Example 1, and the compression permanent deformation of Example 2 is less than that of Example 1, indicating that by adopting the modified metal wire, the metal wire can be stably connected to the base layer and not easily separated, thereby improving the structural stability of the vertical conductive adhesive and thus improving the strength and resilience of the vertical conductive adhesive.

[0136] Compared with Example 2, the hardness, tensile strength and elongation at break in Example 5 are all greater than those in Comparative Example 2, and the compression permanent deformation in Example 5 is less than that in Comparative Example 2. The conductive layer prepared by using methyl vinyl silicone rubber raw rubber, white carbon black, platinum catalyst, hydrogen-containing silicone oil, inhibitor and silane coupling agent in the present application, and then using the conductive layer and the base layer to prepare the vertical conductive adhesive has good vertical conductivity, resilience and high temperature resistance.

[0137] High temperature resistance test: After preparing the environmental box with the vertical conductive adhesive placed in the sample examples 1-7 and the comparative example 1, the temperature was set to 125°C, and the corresponding time was 500H and 1000H, and then the above volume resistivity test was performed. The experimental results are shown in Table 5:

[0138] Table 5 High temperature resistance test data test results

[0139]

[0140] It can be seen from Examples 1-7 and Comparative Example 1 in combination with Table 5 that the vertical conductive adhesive prepared by the present application has good high temperature resistance.

[0141] Compared with Example 1 and Comparative Example 1, the change in vertical resistivity of Comparative Example 1 in the same time period is significantly greater than that of Example 1, indicating that the vertical conductive adhesive prepared by the method and formula of the present application has good high temperature resistance.

[0142] Compared with Example 5 and Comparative Example 2, the change in vertical resistivity of Comparative Example 2 in the same time period is significantly greater than that of Example 5, indicating that the vertical conductive adhesive prepared by the method and formula of the present application has good high temperature resistance.

[0143] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A method for preparing a vertical conductive adhesive, characterized in that: The method comprises the following preparation steps: S1. Mix methyl vinyl silicone rubber, white carbon black, platinum catalyst, hydrogenated silicone oil, inhibitor and silane coupling agent in parts by weight to prepare a mixture A, and then preform the mixture A into a plurality of substrates; S2. Lay metal wires vertically and evenly on the surface of one of the substrates, lay another layer of substrate, lay metal wires in the same way, and then lay another layer of substrate, repeat this process at least 100 times, and then mold and vulcanize the stacked samples at a vulcanization condition of 115-125° C. for 600-800 seconds to obtain a vertical conductive adhesive block, and cut it to obtain a vertical conductive adhesive; The metal wire is a modified metal wire, which is prepared by the following method: A: Soak the metal wire in a phosphoric acid solution, perform ultrasound, add ferric chloride and chitosan, perform ultrasound, filter, and dry to obtain chitosan-metal wire; B: adding chitosan-metal wire and silane coupling agent into anhydrous ethanol at the same time, ultrasonicating, and then heating until the anhydrous ethanol is completely evaporated to obtain a modified metal wire; The weight parts of the raw materials used in the modified metal wire are as follows: Metal wire 10-20 pieces Phosphoric acid solution 20-40 parts 2-5 parts of ferric chloride Chitosan 5-10 parts Silane coupling agent 1-2 parts 10-15 parts of anhydrous ethanol; The substrate is prepared by comprising the following materials in parts by weight: Methyl vinyl silicone rubber raw rubber 100-200 parts 40-150 parts of white carbon black Platinum catalyst 0.15-4 parts 1-5 parts of hydrogen silicone oil Inhibitor 0.05-2 parts Silane coupling agent 0-15 parts.

2. The vertical conductive adhesive according to claim 1, characterized in that: The length of the metal wire is 10-50 μm, and the metal wire is at least one of a gold-plated silver wire, a silver-plated copper wire and a silver wire.

3. A method for preparing a vertical conductive adhesive, characterized in that: The method comprises the following preparation steps: S1. Mix methyl vinyl silicone rubber, white carbon black, platinum catalyst, hydrogenated silicone oil, inhibitor and silane coupling agent in parts by weight to prepare a mixture A, and then preform the mixture A into a plurality of substrates; S2. Mixing methyl vinyl silicone rubber, white carbon black, platinum catalyst, hydrogen-containing silicone oil, inhibitor, silane coupling agent and conductive filler according to parts by weight to prepare a plurality of conductive sheets; S3, laying the conductive sheet on the surface of the substrate, and then laying the substrate on the surface of the conductive sheet, and repeating this process for at least 100 times, and then molding and vulcanizing the stacked samples at a vulcanization condition of 115-125° C. for 600-800 seconds to obtain a vertical conductive adhesive block, and cutting to obtain a vertical conductive adhesive; The conductive sheet is prepared by including the following materials in parts by weight: Methyl vinyl silicone rubber raw rubber 50-200 parts White carbon black 10-100 parts Platinum catalyst 0.1-4 parts 1-5 parts of hydrogen silicone oil Inhibitor 0.05-2 parts Silane coupling agent 0-15 parts Conductive filler 70-300 parts; The substrate is prepared by comprising the following materials in parts by weight: Methyl vinyl silicone rubber raw rubber 100-200 parts 40-150 parts of white carbon black Platinum catalyst 0.15-4 parts 1-5 parts of hydrogen silicone oil Inhibitor 0.05-2 parts Silane coupling agent 0-15 parts.

4. A vertical conductive adhesive according to any one of claims 1 or 3, characterized in that: The hydrogen-containing silicone oil has a viscosity of 10-50 mm2 / s at 25°C and a hydrogen content of 1.5-2.5%.

5. A vertical conductive adhesive according to any one of claims 1 or 3, characterized in that: The density of the methyl vinyl silicone rubber raw rubber is 0.9-1.2 g / ml, the vinyl content is 0.19-0.24%, the cone penetration is 600*0.1mm-900*0.1mm, and the molecular weight is 600,000-680,000.

6. A vertical conductive adhesive, characterized in that: The vertical conductive adhesive is prepared by the vertical conductive adhesive preparation method according to any one of claims 1 to 4. The vertical conductive adhesive comprises at least one group of conductive units, and the conductive units comprise two layers of substrates and a conductive layer disposed between the two layers of the substrates.

7. The vertical conductive adhesive according to claim 6, characterized in that: The conductive layer is formed by metal wires or conductive sheets being laid evenly on the surface of the substrate at equal distances.

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