Conductive rubber strip sealed by composite interlayer

Abstract

The utility model relates to the technical field of rubber sealing materials, in particular to a conductive rubber strip sealed by a composite interlayer, which comprises a rubber strip body, and the rubber strip body comprises an outer layer, a middle layer and an inner layer which are sequentially arranged from outside to inside to form a three-layer gradient composite structure. Wherein the outer layer is an elastic sealing layer, the middle layer is a conductive enhancement layer, the inner layer is a protective layer, and all the layers are integrally connected through a co-extrusion molding process. Through the design of the three-layer gradient composite structure, the outer layer, the middle layer and the inner layer are respectively endowed with the functions of elastic sealing, conductive enhancement and buffer supporting, so that the conductive rubber strip can simultaneously meet the requirements of high-grade waterproof sealing and good conductive performance, and the problem that the traditional rubber strip is single in function is solved.

Description

Technical Field

[0001] This utility model relates to the field of rubber sealing materials technology, specifically to a conductive rubber strip for composite sandwich sealing. Background Technology

[0002] In fields such as electronic equipment and aerospace, the sealing and conductivity of devices are crucial. Traditional rubber sealing strips often struggle to simultaneously meet the requirements of high-level waterproof sealing and good conductivity.

[0003] While some sealing strips offer some waterproofing capabilities, their poor conductivity prevents them from effectively shielding against electromagnetic interference. Conversely, some conductive rubber strips fail to meet high sealing standards, making them prone to water leakage and seal failure in complex environments, thus affecting the normal operation and lifespan of equipment. Furthermore, traditional rubber strips lack a reasonable layered structure, making it difficult to balance various functions and resulting in insufficient interlayer bonding, leading to overall performance instability.

[0004] In view of this, we propose a conductive rubber strip with a composite sandwich seal. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a conductive rubber strip with a composite sandwich seal.

[0006] The technical solution of this utility model is:

[0007] A composite sandwich-sealed conductive rubber strip includes a strip body comprising an outer layer, a middle layer, and an inner layer arranged sequentially from the outside to the inside, forming a three-layer gradient composite structure. The outer layer is an elastic sealing layer, the middle layer is a conductive reinforcement layer, and the inner layer is a protective layer. All layers are integrally connected via a co-extrusion molding process. The middle layer includes a base layer on the outer side and a filler layer and a graphene sheet placed inside the base layer. The inner layer includes a support layer and a buffer layer located inside the support layer. Through this three-layer gradient composite structure design, elastic sealing, conductive reinforcement, and buffer support functions are respectively assigned to the outer, middle, and inner layers, enabling the conductive rubber strip to simultaneously meet the requirements of high-level waterproof sealing and good conductivity, thus solving the problem of the single function of traditional rubber strips.

[0008] As a preferred technical solution, the outer layer uses silicone rubber or ethylene propylene diene monomer (EPDM) rubber as the substrate and is coated with a waterproof coating. The interior is filled with nano-silica particles with a particle size of 5-20 nm and a plasticizer, forming an anti-aging elastomer and achieving IP68-level waterproof sealing performance. This design effectively resists the intrusion of external moisture, dust, and other impurities, ensuring the normal operation of the equipment in harsh environments.

[0009] As a preferred technical solution, the base layer of the intermediate layer is made of fluorosilicone rubber, the filler layer is uniformly dispersed with aluminum-plated silver particles with a particle size of 10-20 μm, and the number of graphene sheets is ≤5, forming a three-dimensional conductive network. This three-dimensional conductive network not only has good conductivity but also effectively shields electromagnetic interference, protecting the internal electronic components of the device from the influence of the external electromagnetic environment.

[0010] As a preferred technical solution, the inner buffer layer is a closed-cell foamed silicone rubber structure with a density of 0.6-0.8 g / cm³, and the average pore size of the foam cells in the buffer layer is 50-100 μm. A fiber layer with a length of 0.5-1 mm is embedded in the inner wall of the foam cells; the fiber layer is nickel-coated graphite fiber, which enhances the interlayer bonding force. The closed-cell foam structure and the fiber layer allow the inner layer to provide good buffering performance while also enhancing the connection strength between the layers, ensuring the overall stability of the rubber strip structure.

[0011] As a preferred technical solution, the graphene sheets are arranged in parallel layers in the intermediate layer, with a spacing of ≤50μm between adjacent graphene sheets, forming a conductive reinforcing framework. This arrangement further optimizes the conductivity of the intermediate layer and improves the overall conductivity efficiency of the conductive rubber strip.

[0012] As a preferred technical solution, the outer layer accounts for 30%-40% of the thickness, the middle layer accounts for 25%-35%, and the inner layer accounts for 30%-40%. The outer layer surface is provided with anti-slip textures, the depth of which is 0.1-0.3 mm and the spacing is 0.5-1 mm. The inner layer has honeycomb-shaped cell arrangements, and the cell wall thickness is ≤10 μm. This reasonable thickness ratio and structural design allow each layer to fully perform its function, and the anti-slip textures and special cell arrangement further improve the performance and stability of the adhesive strip.

[0013] As a preferred technical solution, 0.5%-1% of a silane coupling agent is added to the conductive filler layer of the intermediate layer to improve the dispersibility of the filler. The addition of the silane coupling agent effectively improves the dispersibility of fillers such as aluminum-plated silver particles in the filler layer, thereby improving the conductivity and overall structural strength of the intermediate layer.

[0014] As a preferred technical solution, the adhesive strip body can have an L-shaped, U-shaped, or irregular cross-sectional structure. This diverse cross-sectional design allows it to be adapted to different installation scenarios and sealing requirements, improving the product's versatility and applicability.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model uses a three-layer gradient composite structure design to impart elastic sealing, conductive enhancement and buffer support functions to the outer layer, middle layer and inner layer respectively, so that the conductive rubber strip can simultaneously meet the requirements of high-level waterproof sealing and good conductivity, thus solving the problem of the single function of traditional rubber strips.

[0017] 2. The outer layer of this utility model uses a specific substrate and adds nanoparticles and other components, combined with waterproof coating and anti-slip texture design, to achieve IP68 waterproof sealing performance, while enhancing the anti-aging ability and installation stability of the rubber strip; the middle layer forms a highly efficient three-dimensional conductive network and conductive reinforcement skeleton through the combination of fluorosilicone rubber base layer, aluminum silver-plated particle filling layer and graphene sheet, effectively shielding electromagnetic interference; the inner layer's closed-cell foamed silicone rubber structure and nickel-coated graphite fiber setting provide good buffering performance and enhance interlayer bonding force. The synergistic effect of each layer significantly improves the overall performance of the conductive rubber strip. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 In this utility model Figure 1 Enlarged view of point A in the image;

[0020] Figure 3 This is a schematic diagram of the internal structure of the intermediate layer in this utility model;

[0021] Figure 4 This is a schematic diagram of the inner layer structure in this utility model;

[0022] Figure 5 In this utility model Figure 4 Enlarged view of point B in the image.

[0023] The meanings of the labels in the diagram are as follows:

[0024] 100. Adhesive strip body; 101. Inner layer; 1010. Support layer; 1011. Buffer layer; 1012. Foam cell; 1013. Fiber layer; 102. Intermediate layer; 1020. Base layer; 1021. Filler layer; 1022. Graphene sheet; 103. Outer layer. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please refer to the accompanying drawings. This utility model provides a technical solution:

[0027] like Figures 1-4 As shown, the composite sandwich-sealed conductive rubber strip includes a strip body 100, which comprises an outer layer 103, a middle layer 102, and an inner layer 101 arranged sequentially from the outside to the inside, forming a three-layer gradient composite structure. The outer layer 103 is an elastic sealing layer, the middle layer 102 is a conductive reinforcement layer, and the inner layer 101 is a protective layer. All layers are integrally connected through a co-extrusion molding process. The middle layer 102 includes a base layer 1020 on the outer side and a filler layer 1021 and a graphene sheet 1022 placed inside the base layer 1020. The inner layer 101 includes a support layer 1010 and a buffer layer 1011 disposed inside the support layer 1010. Through this three-layer gradient composite structure design, the functions of elastic sealing, conductive reinforcement, and buffer support are respectively assigned to the outer layer 103, the middle layer 102, and the inner layer 101, enabling the conductive rubber strip to simultaneously meet the requirements of high-level waterproof sealing and good conductivity, solving the problem of the single function of traditional rubber strips.

[0028] like Figure 2 As shown, in a preferred embodiment, the outer layer 103 is made of silicone rubber or ethylene propylene diene monomer (EPDM) as the substrate and is coated with a waterproof coating. The interior is filled with nano-silica particles with a particle size of 5-20 nm and a plasticizer, forming an anti-aging elastomer to achieve waterproof sealing performance. This design effectively resists the intrusion of external moisture, dust, and other impurities, ensuring the normal operation of the equipment in harsh environments.

[0029] like Figure 3 As shown, in a preferred embodiment, the base layer 1020 in the intermediate layer 102 is made of fluorosilicone rubber, the filler layer 1021 is uniformly dispersed with aluminum-plated silver particles with a particle size of 10-20 μm, and the number of graphene sheets 1022 is ≤5, forming a three-dimensional conductive network. This three-dimensional conductive network not only has good conductivity but also effectively shields electromagnetic interference, protecting the internal electronic components of the device from the influence of the external electromagnetic environment.

[0030] like Figure 4 and Figure 5 As shown, in a preferred embodiment, the inner layer 101's buffer layer 1011 is a closed-cell foamed silicone rubber structure with a density of 0.6-0.8 g / cm³. The average pore size of the foam cells 1012 within the buffer layer 1011 is 50-100 μm. A fiber layer 1013 with a length of 0.5-1 mm is embedded in the inner wall of the foam cells 1012. The fiber layer 1013 is nickel-coated graphite fiber, which enhances the interlayer bonding force. The closed-cell foam structure and the fiber layer 1013 allow the inner layer 101 to provide good buffering performance while also enhancing the connection strength between layers, ensuring the overall stability of the adhesive strip structure.

[0031] like Figure 3 As shown, in a preferred embodiment, the graphene sheets 1022 are arranged in parallel layers within the intermediate layer 102, with a spacing of ≤50μm between adjacent graphene sheets 1022, forming a conductive reinforcing framework. This arrangement further optimizes the conductivity of the intermediate layer 102 and improves the overall conductivity efficiency of the conductive rubber strip.

[0032] like Figure 2 As shown, in this preferred embodiment, the outer layer 103 has a thickness ratio of 30%-40%, the middle layer 102 has a thickness ratio of 25%-35%, and the inner layer 101 has a thickness ratio of 30%-40%. The outer layer 103 has anti-slip textures on its surface, with a depth of 0.1-0.3 mm and a spacing of 0.5-1 mm. The inner layer 101 has honeycomb-shaped cells 1012, and the cell wall thickness is ≤10 μm. The reasonable thickness ratio and structural design allow each layer to fully perform its function, and the anti-slip textures and the special cell arrangement further improve the performance and stability of the adhesive strip.

[0033] like Figure 3 As shown, as a preferred technical solution, 0.5%-1% of a silane coupling agent is added to the conductive filler layer 1021 of the intermediate layer 102 to improve the dispersibility of the filler. The addition of the silane coupling agent effectively improves the dispersibility of fillers such as aluminum silver-plated particles in the filler layer 1021, thereby improving the conductivity and overall structural strength of the intermediate layer 102.

[0034] like Figure 1 As shown, in this preferred embodiment, the adhesive strip body 100 can have an L-shaped, U-shaped, or irregular cross-sectional structure. This diverse cross-sectional design allows it to be suitable for different installation scenarios and sealing requirements, improving the product's versatility and applicability.

[0035] The conductive rubber strip of this invention, with its composite sandwich seal, is installed in electronic devices, aerospace equipment, and other parts requiring sealing and conductivity. When the equipment is subjected to external pressure or vibration, the inner layer 101's buffer layer 1011 effectively absorbs energy, providing cushioning protection; the outer layer 103, with its excellent elasticity and waterproof sealing performance, prevents moisture, dust, and other impurities from entering the equipment; and the three-dimensional conductive network and conductive reinforcement skeleton of the middle layer 102 shield electromagnetic interference, ensuring the normal operation of the internal electronic components. This achieves high efficiency in both waterproof sealing and conductivity for the conductive rubber strip.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A conductive rubber strip with composite sandwich sealing, characterized in that: The adhesive strip body (100) includes an outer layer (103), a middle layer (102) and an inner layer (101) arranged sequentially from the outside to the inside, forming a three-layer gradient composite structure. The outer layer (103) is an elastic sealing layer, the middle layer (102) is a conductive reinforcing layer, and the inner layer (101) is a protective layer. The layers are integrated by a co-extrusion molding process. The middle layer (102) includes a base layer (1020) located on the outside and a filling layer (1021) and a graphene sheet (1022) placed inside the base layer (1020). The inner layer (101) includes a support layer (1010) and a buffer layer (1011) located inside the support layer (1010).

2. The conductive rubber strip with composite sandwich sealing as described in claim 1, characterized in that: The outer layer (103) is made of silicone rubber or ethylene propylene diene monomer (EPDM) as the substrate and is coated with a waterproof coating on its outer wall. The interior is filled with nano-silica particles with a particle size of 5-20nm and plasticizers to form an anti-aging elastomer and achieve IP68 waterproof sealing performance.

3. The conductive rubber strip with composite sandwich sealing as described in claim 1, characterized in that: The base layer (1020) in the intermediate layer (102) is made of fluorosilicone rubber, the filler layer (1021) is uniformly dispersed with aluminum silver-plated particles with a particle size of 10-20μm, and the number of graphene sheets (1022) is ≤5, forming a three-dimensional conductive network.

4. The conductive rubber strip with composite sandwich sealing as described in claim 1, characterized in that: The inner layer (101) has a buffer layer (1011) with a closed-cell foamed silicone rubber structure and a density of 0.6-0.8 g / cm³. The average pore size of the foam cells (1012) in the buffer layer (1011) is 50-100 μm. A fiber layer (1013) with a length of 0.5-1 mm is embedded in the inner wall of the foam cells (1012). The fiber layer (1013) is nickel-coated graphite fiber, which enhances the interlayer bonding force.

5. The conductive rubber strip with composite sandwich sealing as described in claim 3, characterized in that: The graphene sheets (1022) are arranged in parallel layers in the intermediate layer (102), with the spacing between adjacent graphene sheets (1022) ≤ 50 μm, forming a conductive reinforcement framework.

6. The conductive rubber strip with composite sandwich sealing as described in claim 1, characterized in that: The outer layer (103) has a thickness of 30%-40%, the middle layer (102) has a thickness of 25%-35%, and the inner layer (101) has a thickness of 30%-40%. The outer layer (103) has anti-slip textures on its surface, with a depth of 0.1-0.3 mm and a spacing of 0.5-1 mm. The inner layer (101) has honeycomb-shaped pores (1012).

7. The conductive rubber strip with composite sandwich sealing as described in claim 1, characterized in that: The conductive filler layer (1021) of the intermediate layer (102) contains 0.5%-1% silane coupling agent to improve the dispersibility of the filler.

8. The conductive rubber strip with composite sandwich sealing as described in claim 1, characterized in that: The adhesive strip body (100) can be L-shaped, U-shaped or irregular cross-section structure.

Images