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CN-224214688-U - Composite sandwich sealed conductive rubber strip

CN224214688UCN 224214688 UCN224214688 UCN 224214688UCN-224214688-U

Abstract

The utility model relates to the technical field of rubber sealing materials, in particular to a composite interlayer sealed conductive rubber strip, which comprises a rubber strip body, wherein 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, the outer layer is an elastic sealing layer, the middle layer is a conductive reinforcing layer, the inner layer is a protective layer, and all the layers are integrally connected through a co-extrusion molding process. According to the utility model, through the design of a three-layer gradient composite structure, the elastic sealing, conductive reinforcement and buffer support functions are respectively given to the outer layer, the middle layer and the inner layer, so that the conductive rubber strip can simultaneously meet the requirements of high-grade waterproof sealing and good conductive performance, and the problem of single function of the traditional rubber strip is solved.

Inventors

  • SONG TAOTAO
  • PENG TAO

Assignees

  • 东莞市海兹鑫电子材料有限公司

Dates

Publication Date
20260508
Application Date
20250606

Claims (8)

  1. 1. The conductive rubber strip with the composite interlayer sealing function is characterized by comprising a rubber strip body (100), wherein the rubber strip body (100) comprises an outer layer (103), an intermediate layer (102) and an inner layer (101) which are sequentially arranged from outside to inside to form a three-layer gradient composite structure, the outer layer (103) is an elastic sealing layer, the intermediate layer (102) is a conductive reinforcing layer, the inner layer (101) is a protective layer, all layers are integrally connected through a coextrusion process, the intermediate layer (102) comprises a base layer (1020) positioned on the outer side, a filling layer (1021) and graphene sheets (1022) arranged in the base layer (1020), and the inner layer (101) comprises a supporting layer (1010) and a buffer layer (1011) arranged on the inner side of the supporting layer (1010).
  2. 2. The conductive rubber strip for composite interlayer sealing as claimed in claim 1, wherein the outer layer (103) is made of a silicon rubber or Ethylene Propylene Diene Monomer (EPDM) base material, the outer wall of the outer layer is sprayed with a waterproof coating, and nano silicon dioxide particles with the particle size of 5-20nm and a plasticizer are filled in the outer layer to form an anti-aging elastomer, so that IP 68-level waterproof sealing performance is realized.
  3. 3. The conductive rubber strip for composite interlayer sealing as claimed in claim 1, wherein the base layer (1020) in the intermediate layer (102) is made of fluorosilicone rubber, the filling layer (1021) is uniformly dispersed with aluminum silver plating particles, the particle size of the aluminum silver plating particles is 10-20 μm, and the number of graphene sheets (1022) is less than or equal to 5 sheets, so that a three-dimensional conductive network is formed.
  4. 4. The composite sandwich sealed conductive rubber strip according to claim 1, wherein the buffer layer (1011) of the inner layer (101) is of a closed-cell foam silicone rubber structure, the density is 0.6-0.8g/cm3, the average pore diameter of the cells (1012) in the buffer layer (1011) is 50-100 μm, the inner walls of the cells (1012) are embedded with fiber layers (1013) with the length of 0.5-1mm, and the fiber layers (1013) are nickel-coated graphite fibers, so that the interlayer bonding force is enhanced.
  5. 5. The conductive rubber strip of claim 3, wherein the graphene sheets (1022) are arranged in a layered parallel manner in the intermediate layer (102), and the distance between adjacent graphene sheets (1022) is less than or equal to 50 μm to form a conductive reinforced skeleton.
  6. 6. The composite sandwich sealed conductive rubber strip of claim 1, wherein the thickness of the outer layer (103) is 30% -40%, the thickness of the middle layer (102) is 25% -35%, the thickness of the inner layer (101) is 30% -40%, anti-skidding patterns are arranged on the surface of the outer layer (103), the depth of the anti-skidding patterns is 0.1-0.3mm, the distance is 0.5-1mm, and the cells (1012) of the inner layer (101) are arranged in a honeycomb shape.
  7. 7. The conductive rubber strip for composite interlayer sealing as claimed in claim 1, wherein 0.5% -1% of silane coupling agent is added into the conductive filling layer (1021) of the intermediate layer (102) to improve the dispersibility of the filler.
  8. 8. The composite sandwich sealed conductive rubber strip of claim 1, wherein said strip body (100) is L-shaped, U-shaped or profiled in cross-section.

Description

Composite sandwich sealed conductive rubber strip Technical Field The utility model relates to the technical field of rubber sealing materials, in particular to a conductive rubber strip for sealing a composite interlayer. Background In the fields of electronic equipment, aerospace and the like, the sealing and conductive performance of the equipment is important. Traditional rubber sealing strips often have difficulty meeting the requirements of both high-grade waterproof sealing and good electrical conductivity. While some sealing strips have certain waterproof capability, but poor electric conductivity and can not effectively shield electromagnetic interference, some conductive rubber strips have the sealing effect which is difficult to reach high standards, and the problems of water seepage, sealing failure and the like are easy to occur in a complex environment, so that the normal operation and the service life of equipment are influenced. In addition, the traditional rubber strip lacks reasonable layering in structural design, and each function is difficult to consider, and the interlayer binding force is insufficient, so that the overall performance is unstable. In view of this, we propose a composite sandwich sealed conductive rubber strip. Disclosure of utility model In order to remedy the above deficiencies, the present utility model provides a composite sandwich sealed conductive rubber strip. The technical scheme of the utility model is as follows: The composite interlayer sealed conductive rubber strip comprises a rubber strip body, wherein 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, the outer layer is an elastic sealing layer, the middle layer is a conductive reinforcing layer, the inner layer is a protective layer, all layers are integrally connected through a coextrusion molding process, the middle layer comprises a base layer positioned on the outer side, a filling layer and a graphene sheet, the filling layer and the graphene sheet are arranged in the base layer, and the inner layer comprises a supporting layer and a buffer layer arranged on the inner side of the supporting layer. Through three-layer gradient composite structure design, give skin, intermediate level and inlayer respectively with elastic sealing, conductive enhancement and buffering support function, make conductive rubber strip can satisfy the demand of high-grade waterproof seal and good conductive property simultaneously, solved the problem of traditional rubber strip function singleness. As the preferable technical scheme, the outer layer adopts a silicon rubber or Ethylene Propylene Diene Monomer (EPDM) base material, waterproof paint is sprayed on the outer wall of the outer layer, nano silicon dioxide particles with the particle size of 5-20nm and a plasticizer are filled in the outer layer, so that an anti-aging elastomer is formed, and IP 68-level waterproof sealing performance is realized. The design can effectively resist the invasion of external moisture, dust and other impurities, and ensure the normal operation of the equipment in a severe environment. As a preferable technical scheme, the base layer in the middle layer is made of fluorosilicone rubber, aluminum silver plating particles are uniformly dispersed in the filling layer, the particle size of the aluminum silver plating particles is 10-20 mu m, and the number of graphene sheets is less than or equal to 5 sheets, so that a three-dimensional conductive network is formed. The three-dimensional conductive network not only has good conductivity, but also can effectively shield electromagnetic interference and protect electronic elements in the equipment from the influence of external electromagnetic environment. As a preferable technical scheme, the buffer layer of the inner layer is of a closed-cell foaming silicon rubber structure, the density is 0.6-0.8g/cm < 3 >, the average pore diameter of cells in the buffer layer is 50-100 mu m, the inner walls of the cells are embedded with fiber layers with the length of 0.5-1mm, and the fiber layers are nickel-coated graphite fibers, so that the interlayer binding force is enhanced. The closed cell foaming structure and the fiber layer are arranged, so that the inner layer can provide good buffer performance, the connection strength between the layers can be enhanced, and the stability of the overall structure of the adhesive tape is ensured. As a preferable technical scheme, the graphene sheets are arranged in a layered parallel manner in the intermediate layer, and the distance between adjacent graphene sheets is less than or equal to 50 mu m, so that a conductive reinforced framework is formed. The arrangement mode further optimizes the conductive performance of the middle layer and improves the overall conductive efficiency of the conductive rubber strip. As the pr