A method of making a directional conductive silicone rubber gasket

Abstract

The present application relates to the technical field of conductive rubber, more particularly to a preparation method of a directional conductive silicone rubber sealing gasket. The specific steps are as follows: equidistantly fixing a wavy metal wire on a frame; placing the metal wire frame into a shaker containing an acid solution, taking out the metal wire frame after oscillation and cleaning, taking out the metal wire frame after cleaning and air-drying; uniformly spraying an adhesive on the surface of the metal wire, placing the metal wire frame into an oven for drying after spraying, tightly stacking the metal wire frame in the same direction in a mold, sealing the gap part after sealing treatment, injecting silicone rubber into the mold prepared by S4 by using a vacuum injection machine, vulcanizing after pouring, taking out the pouring embryo, cutting according to requirements, and the cutting direction being perpendicular to the metal wire arrangement direction. The present application has the advantages of simple operation, easy industrialization and large-scale production, and good conductivity and stability of the prepared silicone rubber sealing gasket.

Description

Technical Field

[0001] This invention relates to the field of conductive rubber technology, and more specifically, to a method for preparing a directional conductive silicone rubber sealing gasket. Background Technology

[0002] Conductive silicone rubber gaskets are functional devices that combine conductivity and environmental sealing. They are primarily made of silicone rubber as the base material, doped with conductive metal fillers, and then molded or extruded and vulcanized. They are used in the gaps and connections of electronic information equipment, providing excellent electromagnetic protection and environmental sealing. Conductive sealing gaskets made by filling silicone rubber with conductive fillers such as pure silver powder, graphite nickel-plated powder, and silver-plated metal powder have achieved industrial application. These gaskets have a volume resistivity ≤0.01Ω·cm and also possess the high and low temperature resistance and corrosion resistance of silicone rubber, making them widely used in aerospace, automotive, consumer electronics, military communications, and other fields requiring electromagnetic protection.

[0003] Traditional conductive silicone rubber sealing gaskets use a single-phase structure, with conductive rubber materials filled with metal-based fillers exhibiting excellent electrical properties (volume resistivity up to 10). -2 Ω·cm~10 -3 It is widely used in high-end fields such as electronic communications and aerospace. However, for this type of sealing gasket, the metal-based filler is prone to oxidation in air or high-temperature environments, causing the electrical performance of the sealing gasket to decrease with prolonged use. Simultaneously, the conductive network formed by the interconnection of conductive particles has discontinuities, making it difficult to achieve metallic-level conductivity. Furthermore, its isotropic conductivity is insufficient for applications requiring unidirectional conductivity. In addition, the addition of a large amount of conductive filler (typically between 60wt% and 90wt%) results in disadvantages such as low strength, high density, high hardness, and high cost for filled conductive rubber.

[0004] Patents CN 103980711 A and CN 110894359 A utilize a metal wire directional implantation process combined with a liquid silicone rubber casting process to prepare a rubber composite material with directional conductivity. While achieving anisotropic conductivity, the material's corrosion resistance is improved (compared to traditional metal-filled conductive rubber, the metal wire content in directional conductive rubber is significantly reduced, and each metal wire is isolated from the others. In a salt spray corrosion environment, the electrolyte often has difficulty penetrating into the rubber matrix, thus significantly slowing down the corrosion rate of the metal wires. Through comparative experiments, it was found that after the salt spray test, corrosion spots appeared on the surface of the metal-filled conductive rubber, while the appearance of the directional metal wire conductive rubber did not change significantly). Both of the aforementioned patents employ silane coupling agents or phthalate coupling agents to perform surface coupling treatment on the metal wires to enhance the bonding force between the metal wires and silicone rubber. While this method can provide some reinforcement, damage and breakage still occur during high overload, strong impact, and long-term use, affecting the electromagnetic protection performance and environmental sealing performance of the product, making it difficult to meet application requirements. On the other hand, the poor bonding force between the metal wires and silicone rubber makes them prone to fraying during cutting, resulting in a decrease in the conductivity of the rubber sealing gasket and adversely affecting the electromagnetic interference protection performance and environmental sealing performance of the equipment. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one aspect of the present invention is to provide a method for preparing a directional conductive silicone rubber sealing gasket, the specific steps of which are as follows:

[0006] S1. Wire arrangement: Fixing wavy metal wires at equal intervals on the frame;

[0007] S2, Etching treatment: Place the metal wire frame arranged in S1 into a shaker containing acid solution. After shaking, remove the metal wire frame and clean it. After cleaning, remove the metal wire frame and let it dry.

[0008] S3. Adhesive treatment: Apply adhesive evenly to the surface of the metal wire frame that has been dried in S2. After spraying, put the metal wire frame into an oven to dry.

[0009] S4. Frame fixing: The dried wire frame from S3 is tightly stacked in the mold along the same direction. After sealing, the gaps are sealed with a sealant to obtain the mold.

[0010] S5. Casting: Silicone rubber is injected into the mold prepared in S4 using a vacuum injection molding machine. After casting, vulcanization is carried out to obtain the casting preform.

[0011] S6. Cutting: Take out the casting blank prepared in S5 and cut it into a rubber liner of a certain shape and size according to the requirements. The cutting direction is perpendicular to the direction of the metal wire arrangement.

[0012] Preferably, the metal wire in S1 includes austenitic stainless steel wire, aluminum wire, copper wire or alloy wire; the wire diameter is 0.1mm to 0.2mm, the distance between the metal wires is 0.8mm to 1.2mm, and the thickness of the fixing frame is 0.8mm to 1.2mm.

[0013] Preferably, the acid solution in S2 is a hydrofluoric acid solution with a concentration of 5%–15%, a solution temperature of 30℃–50℃, and an oscillation time of 0.5h–2h. Higher concentrations of hydrofluoric acid, higher temperatures, and longer oscillation times result in faster corrosion rates on the metal wire, and vice versa. The metal wire frame is cleaned with water in an ultrasonic cleaner for 5min–10min. The metal wire is etched using a hydrofluoric acid solution. Hydrofluoric acid is a weak acid with strong corrosiveness, capable of corroding austenitic stainless steel, aluminum, and copper alloys, but has poor corrosive effects on super austenitic stainless steel, duplex stainless steel, lead and lead alloys, Monel alloys, and magnesium alloys.

[0014] Preferably, the adhesive in step S3 is a single-component or two-component silicone adhesive. The single-component silicone adhesive is a mixture of hydroxyl-terminated silicone rubber, methyltrimethoxysilane, organotin, and toluene, with a component ratio of 100:4-8:0.2-0.6:1-5. The two-component silicone adhesive has component A as a mixture of hydroxyl-terminated silicone rubber, hydrogen-containing silicone oil, and toluene, with a component ratio of 100:4-7:3-9, and component B as a mixture of hydroxyl-terminated silicone rubber, chloroplatinic acid compound, and toluene, with a component ratio of 100:0.2-0.5:1-5. The spraying pressure is 0.2 MPa-0.5 MPa, and the spraying time is 30-120 seconds. The oven drying temperature is 100°C-130°C, and the drying time is 2-4 hours.

[0015] Preferably, the silicone rubber in S5 is an AB two-component liquid silicone rubber, with the A and B components mixed in a 1:1 ratio. After being uniformly mixed in a dispensing tube, it is injected into the mold prepared in S4. The AB two-component liquid silicone rubber is cured at room temperature.

[0016] Preferably, the A component of the AB two-component liquid silicone rubber includes a crosslinking agent, a catalyst, silica, and a reinforcing agent, while the B component includes a colorant, a flame retardant, a mildew inhibitor, and a structure control agent.

[0017] Preferably, the A component of the AB two-component liquid silicone rubber includes a foaming agent, a crosslinking agent, a catalyst, silica, and a reinforcing agent, while the B component includes a colorant, a flame retardant, a mildew inhibitor, and a structure control agent.

[0018] Preferably, the AB two-component liquid silicone rubber casting product is a solid-core oriented conductive silicone rubber sealing gasket.

[0019] Preferably, the AB two-component liquid silicone rubber casting product is a sponge-type directional conductive silicone rubber sealing gasket.

[0020] Preferably, in step S5, vulcanization is carried out at room temperature for 24 to 48 hours.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention first employs hydrofluoric acid solution to acid-etch the metal wire, roughening the wire surface and effectively increasing the contact area between the silicone rubber and the metal wire, thereby enhancing their bonding strength. After acid etching, the metal wire is sprayed with a silicone adhesive, significantly improving the interfacial bonding between the silicone rubber and the metal wire. Compared to traditional metal wire coupling processes, this method substantially improves the interfacial bonding strength between the metal wire and silicone rubber, significantly enhancing the mechanical strength of the sealing gasket while maintaining its excellent conductivity, and simultaneously reducing the wire breakage rate during the cutting process of the cast blank.

[0023] The present invention has a simple operation method and is easy to realize large-scale industrial production. The prepared silicone rubber sealing gasket has good conductivity and stability and can be used for electromagnetic interference protection and environmental sealing in fields such as military equipment for land, sea and air, household appliances, and automotive industry.

[0024] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the surface structure of the metal wire after hydrofluoric acid etching in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the solid directional conductive silicone rubber sealing gasket structure according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the sponge-type directional conductive silicone rubber sealing gasket structure according to an embodiment of the present invention. Detailed Implementation

[0029] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0031] Example 1

[0032] S1. Wire arrangement: Fix wavy stainless steel wires at equal intervals on the frame. The diameter of the stainless steel wire is 0.15mm, the distance between the stainless steel wires is 1mm, and the thickness of the fixing frame is 1mm.

[0033] S2. Etching Treatment: Place the stainless steel wire frame arranged in S1 into a shaker containing a hydrofluoric acid solution. The hydrofluoric acid solution concentration is 10%, the solution temperature is 30℃, and the shaking time is 1 hour. After shaking, remove the stainless steel wire frame and clean it in an ultrasonic cleaner containing clean water for 10 minutes. After cleaning, remove the stainless steel wire frame and let it air dry. The etched stainless steel wire... Figure 1 As shown;

[0034] S3. Adhesive treatment: The stainless steel wire frame dried in S2 is uniformly sprayed onto the surface of the stainless steel wire with a one-component silicone adhesive (the one-component silicone adhesive is a mixture of hydroxyl-terminated silicone rubber, methyltrimethoxysilane, organotin and toluene, with a component ratio of 100:5:0.3:2). The spraying pressure is 0.2MPa and the spraying time is 30s. After the spraying is completed, the stainless steel wire frame is placed in an oven and the temperature is set to 100℃ for 2 hours to dry.

[0035] S4. Frame fixing: The stainless steel wire frame dried in S3 is tightly stacked in the mold in the same direction. After sealing, the gaps are sealed with a sealant to obtain the mold.

[0036] S5. Casting: Component A consists of crosslinking agent, catalyst, silica and reinforcing agent, and component B consists of color paste, flame retardant, mildew inhibitor and structure control agent. The mixing ratio of components A and B is 1:1. After uniform mixing in the injection tube, AB two-component liquid silicone rubber is prepared. The AB two-component liquid silicone rubber is injected into the mold prepared in S4 using a vacuum injection machine. After casting, it is vulcanized at room temperature for 24 hours to obtain the casting preform.

[0037] S6. Cutting: Take out the casting blank prepared in S5 and cut it into rubber gaskets with a thickness of 2.36mm according to requirements. The cutting direction is perpendicular to the arrangement direction of the stainless steel wires. The resulting product is a solid-core oriented conductive silicone rubber sealing gasket. Figure 2 As shown.

[0038] Example 2

[0039] S1. Wire arrangement: Fix wavy aluminum alloy wires at equal intervals on the frame. The diameter of the aluminum alloy wires is 0.15mm, the distance between the aluminum alloy wires is 1mm, and the thickness of the fixing frame is 1mm.

[0040] S2. Etching Treatment: Place the aluminum alloy wire frame arranged in S1 into an oscillator containing a hydrofluoric acid solution. The hydrofluoric acid solution concentration is 15%, the solution temperature is 35℃, and the oscillation time is 2 hours. After oscillation, remove the aluminum alloy wire frame and clean it in an ultrasonic cleaner containing clean water for 12 minutes. After cleaning, remove the aluminum alloy wire frame and let it air dry. The etched aluminum alloy wires are as follows: Figure 1 As shown;

[0041] S3. Adhesive treatment: The aluminum alloy wire frame dried in S2 is uniformly sprayed onto the surface of the aluminum alloy wire with a one-component silicone adhesive (the one-component silicone adhesive is a mixture of hydroxyl-terminated silicone rubber, methyltrimethoxysilane, organotin and toluene, with a component ratio of 100:6:0.5:4). The spraying pressure is 0.3MPa and the spraying time is 50s. After the spraying is completed, the aluminum alloy wire frame is placed in an oven and the temperature is set to 110℃ for 3 hours to dry.

[0042] S4. Frame fixing: The aluminum alloy wire frame dried in S3 is tightly stacked in the mold in the same direction. After sealing, the gaps are sealed with a sealant to obtain the mold.

[0043] S5. Casting: Component A consists of foaming agent, crosslinking agent, catalyst, silica and reinforcing agent, and component B consists of color paste, flame retardant, mildew inhibitor and structure control agent. The mixing ratio of components A and B is 1:1. After uniform mixing in the injection tube, AB two-component liquid silicone rubber is prepared. The AB two-component liquid silicone rubber is injected into the mold prepared in S4 using a vacuum injection machine. After casting, it is vulcanized at room temperature for 24 hours to obtain the casting preform.

[0044] S6. Cutting: Take out the casting blank prepared in S5 and cut it into rubber gaskets with a thickness of 1.57mm according to requirements. The cutting direction is perpendicular to the arrangement direction of the aluminum alloy wires. The resulting product is a sponge-type oriented conductive silicone rubber sealing gasket. Figure 3 As shown.

[0045] Example 3

[0046] S1. Wire arrangement: Fix the wavy tin-plated phosphor bronze wires at equal intervals on the frame. The diameter of the tin-plated phosphor bronze wires is 0.1mm, the distance between the tin-plated phosphor bronze wires is 1mm, and the thickness of the fixing frame is 1mm.

[0047] S2. Etching Treatment: Place the tin-plated phosphor bronze wire frame arranged in S1 into a shaker containing a hydrofluoric acid solution. The hydrofluoric acid solution concentration is 12%, the solution temperature is 40℃, and the shaking time is 1.5 hours. After shaking, remove the tin-plated phosphor bronze wire frame and clean it in an ultrasonic cleaner containing clean water for 10 minutes. After cleaning, remove the tin-plated phosphor bronze wire frame and let it air dry. The tin-plated phosphor bronze wire after etching treatment is as follows: Figure 1 As shown;

[0048] S3. Adhesive treatment: The tin-plated phosphor bronze wire frame dried in S2 is evenly sprayed onto the surface of the tin-plated phosphor bronze wire with a single-component silicone adhesive (the single-component silicone adhesive is a mixture of hydroxyl-terminated silicone rubber, methyltrimethoxysilane, organotin and toluene, with a component ratio of 100:4:0.6:4). The spraying pressure is 0.4MPa and the spraying time is 60s. After the spraying is completed, the tin-plated phosphor bronze wire frame is placed in an oven and the temperature is set to 120℃ for 4 hours to dry.

[0049] S4. Frame fixing: The tin-plated phosphor bronze wire frame dried in S3 is tightly stacked in the mold in the same direction. After sealing, the gaps are sealed with a sealant to obtain the mold.

[0050] S5. Casting: Component A consists of foaming agent, crosslinking agent, catalyst, silica and reinforcing agent, and component B consists of color paste, flame retardant, mildew inhibitor and structure control agent. The mixing ratio of components A and B is 1:1. After uniform mixing in the injection tube, AB two-component liquid silicone rubber is prepared. The AB two-component liquid silicone rubber is injected into the mold prepared in S4 using a vacuum injection machine. After casting, it is vulcanized at room temperature for 36 hours to obtain the casting preform.

[0051] S6. Cutting: Take out the casting blank prepared in S5 and cut it into rubber gaskets with a thickness of 0.78mm according to requirements. The cutting direction is perpendicular to the arrangement direction of the tin-plated phosphor bronze wires. The resulting product is a sponge-type oriented conductive silicone rubber sealing gasket. Figure 3 As shown.

[0052] Example 4

[0053] S1. Wire arrangement: Fix wavy stainless steel wires at equal intervals on the frame. The diameter of the stainless steel wire is 0.1mm, the distance between the stainless steel wires is 1mm, and the thickness of the fixing frame is 1mm.

[0054] S2. Etching Treatment: Place the stainless steel wire frame arranged in S1 into a shaker containing a hydrofluoric acid solution. The hydrofluoric acid solution concentration is 15%, the solution temperature is 50℃, and the shaking time is 1 hour. After shaking, remove the stainless steel wire frame and clean it in an ultrasonic cleaner containing clean water for 10 minutes. After cleaning, remove the stainless steel wire frame and let it air dry. The etched stainless steel wire... Figure 1 As shown;

[0055] S3. Adhesive Treatment: The stainless steel wire frame dried in S2 is uniformly sprayed onto the surface of the stainless steel wire with a two-component silicone adhesive (component A of the two-component silicone adhesive is a mixture of hydroxyl-terminated silicone rubber, hydrogen-containing silicone oil and toluene, with a component ratio of 100:5:6, and component B is a mixture of hydroxyl-terminated silicone rubber, chloroplatinic acid compound and toluene, with a component ratio of 100:0.3:2). The spraying pressure is 0.5MPa and the spraying time is 80s. After spraying, the stainless steel wire frame is placed in an oven at 100℃ and dried for 4 hours.

[0056] S4. Frame fixing: The stainless steel wire frame dried in S3 is tightly stacked in the mold in the same direction. After sealing, the gaps are sealed with a sealant to obtain the mold.

[0057] S5. Casting: Component A consists of foaming agent, crosslinking agent, catalyst, silica and reinforcing agent, and component B consists of color paste, flame retardant, mildew inhibitor and structure control agent. The mixing ratio of components A and B is 1:1. After uniform mixing in the injection tube, AB two-component liquid silicone rubber is prepared. The AB two-component liquid silicone rubber is injected into the mold prepared in S4 using a vacuum injection machine. After casting, it is vulcanized at room temperature for 48 hours to obtain the casting preform.

[0058] S6. Cutting: Take out the casting blank prepared in S5 and cut it into rubber gaskets with a thickness of 1.02mm according to requirements. The cutting direction is perpendicular to the arrangement direction of the stainless steel wires. The resulting molded product is a sponge-type oriented conductive silicone rubber sealing gasket. Figure 3 As shown.

[0059] Example 5

[0060] S1. Wire arrangement: Fix wavy aluminum alloy wires at equal intervals on the frame. The diameter of the aluminum alloy wires is 0.15mm, the distance between the aluminum alloy wires is 1mm, and the thickness of the fixing frame is 1mm.

[0061] S2. Etching Treatment: Place the aluminum alloy wire frame arranged in S1 into a shaker containing a hydrofluoric acid solution. The hydrofluoric acid solution concentration is 6%, the solution temperature is 50℃, and the shaking time is 2 hours. After shaking, remove the aluminum alloy wire frame and clean it in an ultrasonic cleaner containing clean water for 10 minutes. After cleaning, remove the aluminum alloy wire frame and let it air dry. The etched aluminum alloy wires are as follows: Figure 1 As shown;

[0062] S3. Adhesive Treatment: The aluminum alloy wire frame dried in S2 is uniformly sprayed onto the surface of the aluminum alloy wire with a two-component silicone adhesive (component A of the two-component silicone adhesive is a mixture of hydroxyl-terminated silicone rubber, hydrogen-containing silicone oil and toluene, with a component ratio of 100:5:7, and component B is a mixture of hydroxyl-terminated silicone rubber, chloroplatinic acid compound and toluene, with a component ratio of 100:0.5:4). The spraying pressure is 0.3MPa and the spraying time is 60s. After spraying, the aluminum alloy wire frame is placed in an oven at 120℃ and dried for 3 hours.

[0063] S4. Frame fixing: The aluminum alloy wire frame dried in S3 is tightly stacked in the mold in the same direction. After sealing, the gaps are sealed with a sealant to obtain the mold.

[0064] S5. Casting: Component A consists of crosslinking agent, catalyst, silica and reinforcing agent, and component B consists of color paste, flame retardant, mildew inhibitor and structure control agent. The mixing ratio of components A and B is 1:1. After uniform mixing in the injection tube, AB two-component liquid silicone rubber is prepared. The AB two-component liquid silicone rubber is injected into the mold prepared in S4 using a vacuum injection machine. After casting, it is vulcanized at room temperature for 24 hours to obtain the casting preform.

[0065] S6. Cutting: Take out the casting blank prepared in S5 and cut it into rubber gaskets with a thickness of 1.57mm according to requirements. The cutting direction is perpendicular to the arrangement direction of the aluminum alloy wires. The resulting product is a solid-core oriented conductive silicone rubber sealing gasket. Figure 2 As shown.

[0066] The performance of the directional conductive silicone rubber sealing gaskets prepared according to any one of Examples 1 to 5 was compared with that of the directional conductive silicone rubber sealing gaskets prepared by coupling agent treatment in the prior art. The results are shown in Table 1 below:

[0067] Table 1. Comparison of performance of oriented conductive silicone rubber gaskets with different metal wire treatment methods

[0068] Metal wire processing methods Coupling agent treatment This invention Resistance (Ω, thickness 2mm) 0.02 0.02 Tensile strength (MPa) 2.25 3.77 Elongation at break (%) 256 230 Tear strength (kN / m) 10.8 13.9 Shore A Hardness 44 45 Desiccation rate (%) 5.6 1.8

[0069] As can be seen from the results in the table above, the tensile strength of the embodiments of the present invention was improved and the filament rate was significantly reduced without changing the resistivity, thus effectively ensuring the conductivity of the sealing gasket.

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method for preparing a directional conductive silicone rubber sealing gasket, characterized in that: The specific steps of the preparation method are as follows: S1. Wire arrangement: Fixing wavy metal wires at equal intervals on the frame; S2, Etching treatment: Place the metal wire frame arranged in S1 into a shaker containing acid solution. After shaking, remove the metal wire frame and clean it. After cleaning, remove the metal wire frame and let it dry. S3. Adhesive treatment: Apply adhesive evenly to the surface of the metal wire frame that has been dried in S2. After spraying, put the metal wire frame into an oven to dry. S4. Frame fixing: The dried wire frame from S3 is tightly stacked in the mold along the same direction. After sealing, the gaps are sealed with a sealant to obtain the mold. S5. Casting: Silicone rubber is injected into the mold prepared in S4 using a vacuum injection molding machine. After casting, vulcanization is carried out to obtain the casting preform. S6. Cutting: Take out the casting blank prepared in S5 and cut it into a rubber liner of a certain shape and size according to the requirements. The cutting direction is perpendicular to the direction of the metal wire arrangement. The metal wire in S1 includes austenitic stainless steel wire, aluminum wire, copper wire or alloy wire; the wire diameter is 0.1mm to 0.2mm, the distance between the metal wires is 0.8mm to 1.2mm, and the thickness of the fixing frame is 0.8mm to 1.2mm. The acid solution in S2 is a hydrofluoric acid solution with a concentration of 5% to 15%, a solution temperature of 30℃ to 50℃, and an agitation time of 0.5h to 2h. The metal wire frame is cleaned with water in an ultrasonic cleaner for 5min to 10min.

2. The method for preparing a directional conductive silicone rubber sealing gasket according to claim 1, characterized in that: The adhesive in S3 is a single-component or two-component silicone adhesive. The single-component silicone adhesive is a mixture of hydroxyl-terminated silicone rubber, methyltrimethoxysilane, organotin, and toluene, with a component ratio of 100:4-8:0.2-0.6:1-5. The two-component silicone adhesive has component A as a mixture of hydroxyl-terminated silicone rubber, hydrogen-containing silicone oil, and toluene, with a component ratio of 100:4-7:3-9, and component B as a mixture of hydroxyl-terminated silicone rubber, chloroplatinic acid compound, and toluene, with a component ratio of 100:0.2-0.5:1-5. The spraying pressure is 0.2MPa-0.5MPa, and the spraying time is 30s-120s. The oven drying temperature is 100℃-130℃, and the drying time is 2h-4h.

3. The method for preparing a directional conductive silicone rubber sealing gasket according to claim 1, characterized in that: The silicone rubber in S5 is a two-component liquid silicone rubber with a mixing ratio of 1:1 for components A and B. After being uniformly mixed in a dispensing tube, it is injected into the mold prepared in S4. The two-component liquid silicone rubber is cured at room temperature.

4. The method for preparing a directional conductive silicone rubber sealing gasket according to claim 3, characterized in that: The AB two-component liquid silicone rubber includes crosslinking agent, catalyst, silica and reinforcing agent in component A, and color paste, flame retardant, mildew inhibitor and structure control agent in component B.

5. The method for preparing a directional conductive silicone rubber sealing gasket according to claim 3, characterized in that: The AB two-component liquid silicone rubber includes a foaming agent, a crosslinking agent, a catalyst, silica, and a reinforcing agent in component A, and a colorant, a flame retardant, a mildew inhibitor, and a structure control agent in component B.

6. The method for preparing a directional conductive silicone rubber sealing gasket according to claim 4, characterized in that: The AB two-component liquid silicone rubber casting product is a solid core type directional conductive silicone rubber sealing gasket.

7. The method for preparing a directional conductive silicone rubber sealing gasket according to claim 5, characterized in that: The AB two-component liquid silicone rubber casting product is a sponge-type directional conductive silicone rubber sealing gasket.

8. The method for preparing a directional conductive silicone rubber sealing gasket according to claim 1, characterized in that: The S5 is vulcanized at room temperature for 24 to 48 hours.

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