CN212342490U - Rubber and metal composite electric contact - Google Patents
Rubber and metal composite electric contact Download PDFInfo
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- CN212342490U CN212342490U CN201922321135.9U CN201922321135U CN212342490U CN 212342490 U CN212342490 U CN 212342490U CN 201922321135 U CN201922321135 U CN 201922321135U CN 212342490 U CN212342490 U CN 212342490U
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Abstract
The utility model discloses a rubber and metal composite electric contact, which is a sheet formed by compounding rubber and a metal sheet, wherein the sheet is a small round sheet with the diameter of 1.0-10.0 mm; the inner surface of the metal sheet at least comprises an etched area not less than 0.01mm2The fresh surface of (a), the fresh surface being bonded to the rubber. The utility model discloses a metal sheet inner surface has fresh partial surface, owing to do not contain any grease and spot brought by the metal sheet, can ensure the firm combination of metal sheet and rubber, prevents that the metal sheet from breaking away from, ensures rubberAnd the reliability of the glue and metal composite electric contact.
Description
Technical Field
The utility model belongs to material field or macromolecular material field relate to a rubber and compound electrical contact of metal.
Background
Rubber keys are used in remote controls, games, handsets, power tools, medical devices and automobiles, and one of the key components of a rubber key is an electrical contact (also called a "conductive particle") which, when pressed, contacts a PCB and functions as a circuit switch.
The invention patent 'composite conductive sheet' with Chinese patent application number of 201010592410.1 provides a composite conductive sheet composed of a polymer matrix and a metal foil, wherein the surface of the metal foil is uneven. The invention patent 'pitted surface metal and rubber composite conductive particle' with Chinese patent application number of 201110193369.5 discloses a composite conductive particle of pitted surface metal and rubber, wherein the metal surface is a pitted surface and is provided with pits, salient points or both. The invention patent 'a noble metal plated switch contact element and a preparation method thereof' of Chinese patent application No. 201410467116.6 discloses a method for preparing a noble metal switch contact element on the outer surface of a metal layer through plating resistance, plating and etching processes. The invention patent 'a multilayer porous metal and high polymer material composite sheet' of chinese patent application No. 201610798351 discloses a two-layer or multilayer porous metal and high polymer material composite sheet, and an electrical contact made of the composite sheet, the material composition of the two outer surfaces of the electrical contact is consistent, and the contact resistance is low.
These above patents all focus on the outer surface of the electrical contacts (the side of the electrical contacts that may contact the PCB). The attention on the inner surface of the electrical contact is limited to the use of adhesives and primers between the metal layer and the polymer material layer to enhance the adhesive strength between the metal layer and the polymer material layer. However, in our production practice, no matter how to strengthen the cleaning of the metal sheet, no matter how to enhance the adhesion by using various adhesives, or how to use self-adhesive rubber as the polymer material layer, no matter what quality or brand of polymer material is used, no matter what vulcanization molding process is used, no matter how to use a release agent in the vulcanization molding process, no matter whether to clean the vulcanization mold, and no matter how to maintain the firm adhesion between the metal layer and the polymer material layer (or the rubber layer) in all the rubber-metal composite electric contacts produced by us and no matter how to clean the vulcanization mold, the metal layer can not be kept and not fall off. The metal layer drops by itself, or the electric contact dropped after the metal layer lightly touches sometimes reaches the ppm level, which seriously affects the product quality and the production efficiency. We now suspect that this may be due to the fact that the metal strip used for the production of the rubber-metal composite electrical contact is subjected to various contaminations during its production and transport, the surface of the metal strip being contaminated with visible and invisible oil, stains, rust, dust impurities, chemicals such as paraffins, metallic brighteners etc., which, however, may not necessarily be cleaned well by intensive cleaning processes. In such a case, even if the other process or material is preferable, it is not possible to ensure that the metal layer and the polymer material layer (or the rubber layer) are firmly bonded, and it is not possible to ensure that the metal layer does not fall off.
In the rubber-metal composite type electrical contact, if separation occurs between the metal layer and the polymer material layer, the metal layer is peeled off, which not only makes the switching function of the key ineffective, but also may cause personal safety accidents, particularly in the case where such an electrical contact is used in an automobile.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the utility model discloses a rubber and metal composite electric contact to stop the shedding phenomenon of metal layer in the electric contact.
The technical scheme is as follows: a rubber and metal composite electric contact is a sheet formed by compounding rubber and a metal sheet, wherein the sheet is a small round sheet with the diameter of 1.0-10.0 mm; the inner surface of the metal sheet at least comprises an etched area not less than 0.01mm2The fresh surface of (a), the fresh surface being bonded to the rubber.
Preferably, the fresh surfaces are circular, oval, square, linear or other geometric shapes when viewed from the surface of the metal sheet, and the area of each fresh surface is not more than one fifth of the surface area of one surface of the metal sheet in the rubber and metal composite type electric contact. The area of the fresh surface is controlled, so that the time for producing the fresh surface in production can be saved, and meanwhile, the inner surface of the metal sheet in each electric contact is ensured to be at least provided with more than two fresh surfaces.
Preferably, the fresh surface is recessed, the depth of the recess being less than half the thickness of the metal sheet; the shape of the depression is spherical crown, hemispherical, semi-ellipsoidal, truncated spherical, cylindrical, truncated conical, prismatic, pyramidal, truncated pyramidal, or irregular geometric shape. The depth of the fresh surface depression is less than one-half of the thickness of the metal sheet, which ensures that when both sides of the metal sheet are etched to the same depth, no perforation occurs in the metal sheet.
Alternatively, the inner and outer surfaces of the metal sheet are uniform or substantially uniform in shape.
Preferably, the metal sheet is gold, silver, copper, zinc, molybdenum, iridium, tungsten, cobalt, nickel, indium, iron, platinum, rhodium, palladium, tin, titanium, or an alloy of one of these metal elements. Preferably, the metal sheet is stainless steel, copper or a copper alloy, nickel or a nickel alloy, cobalt or a cobalt alloy.
Preferably, the thickness of the metal sheet is 0.01-0.20mm, the thickness of the rubber layer is 0.1-1.0mm, and the thickness of the rubber and metal composite type electric contact is 0.12-1.2 mm.
As an optimization, the metal sheet, the rubber layer and the electrical contact are circular; the diameters of the metal sheet, the rubber layer and the electrical contact are in the range of 1.0-10.0 mm. The diameter of the rubber layer in the same electric contact is 0.01-5.0% larger than that of the metal sheet.
Preferably, a plurality of pits with the pit mouth diameter of about 0.25mm are etched on the inner surface of the metal sheet, the pits are cylindrical, truncated cone-shaped, conical, truncated pyramid-shaped, hemispherical, spherical crown-shaped or other irregular shapes, the depth of each pit is 0.025-0.035mm, and the distance between the axial centers of two adjacent pits is about 0.75 mm.
Preferably, the rubber is silicon rubber: thermosetting silicone rubber or self-adhesive silicone rubber; the thickness of the silicon rubber layer is 0.1-1.0mm, the surface of the silicon rubber is flat, or the material is a cylinder, a truncated cone, a hemisphere or a cone, the height of the bulge of the silicon rubber is 0.01-1.0mm, and the diameter of the cross section of the cylinder is not more than 1.0 mm.
Has the advantages that: the utility model discloses the compound electric contact of rubber-metal who makes, because the sheetmetal has fresh metal surface before compound with rubber, got rid of the pollution uncontrollable factors such as sheetmetal from the area for have reliable adhesive strength between rubber and the sheetmetal, effectively prevented coming off of sheetmetal, thereby improved electric contact's reliability, security, had good application prospect, stopped the phenomenon that the sheetmetal drops in the compound electric contact of rubber-metal.
Drawings
Fig. 1 is a schematic sectional view of an electrical contact according to embodiment 1 of the present invention;
fig. 2 is a schematic cross-sectional view of a conductive particle according to embodiment 3 of the present invention.
In the figure, 1, a metal sheet (stainless steel); 2. rubber (silicone rubber).
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
Example 1
The stainless steel sheet of 0.08mm thickness was cleaned to remove as much as possible the oily stains on the surface of the sheet. Through a laser etching method, a plurality of pits with the pit opening diameter of 0.25mm are formed on two surfaces of the stainless steel sheet through laser etching, the shape of each pit is cylindrical, the depth of each pit is 0.030 +/-0.005 mm, and the distance between the axial centers of two adjacent pits is 0.75 mm. After dip-coating the stainless steel sheet with a primer for improving adhesion with the silicone rubber, the stainless steel sheet is molded with methyl vinyl silicone rubber containing 0.5% of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane for 10min at about 165 ℃, and the silicone rubber and the stainless steel sheet are adhered together to form a silicone rubber-stainless steel sheet with the thickness of 0.85 mm.
And punching the obtained silicon rubber-stainless steel sheet into a small wafer with the diameter of 3.5mm to obtain the rubber-metal composite electric contact. The outer surface of the electrical contact thus obtained has a certain resistance to dust in use, due to the presence of the pits. Because the inner surface (the surface combined with the silicon rubber) of the stainless steel in each electric contact is provided with more than ten fresh surfaces etched by the laser, the fresh surfaces do not have any oil stain, stain and special chemicals, the inner surface of the stainless steel is firmly bonded with the silicon rubber, and the stainless steel is prevented from falling off from the silicon rubber.
Example 2
Essentially the same as example 1, but with the depth of the laser etched pits on both sides of the stainless steel being different. During laser etching, the depth of a cylindrical pit etched on one surface of the stainless steel is 0.03-0.05mm, and the depth of a pit etched on the other surface of the stainless steel is 0.001-0.01 mm. The surface with the pit depth of 0.03-0.05mm is exposed in the rubber-stainless steel sheet to form the outer surface of the composite sheet, and the surface with the pit depth of 0.001-0.01mm is combined with the silicone rubber to form the inner surface.
The rubber-metal composite electric contact prepared by the method has good dust resistance, and meanwhile, the laser etching depth of the inner surface of the metal layer is smaller, so that the laser etching time is favorably shortened, and the production efficiency is improved.
Example 3
The pattern for exposure is designed first. Cleaning a nickel sheet with the thickness of 0.10mm and the nickel content of more than 99.5 percent, then respectively printing a layer of cured photosensitive resist with the thickness of 3-9 mu m and washed off by alkali liquor on two surfaces of the nickel sheet by a metal screen printing method, drying, exposing according to a designed pattern, developing (namely washing off the photosensitive resist on the unexposed part by water), thereby preparing the nickel sheet with the two surfaces covered by the cured photosensitive resist film and exposed metal (namely nickel) small round points which are uniformly distributed. The diameter of the metal small dots is 0.2mm, and the distance between the centers of two adjacent metal small dots is 0.65 mm.
Etching the nickel sheet protected by the photosensitive resist by using an acidic etching solution containing ferric trichloride, and etching small pits with the depth of 0.025-0.040mm at the exposed small round points on the nickel sheet protected by the photosensitive resist. And cleaning the nickel plate protected by the photosensitive resist with a sodium hydroxide solution, removing the photosensitive resist on two sides of the nickel plate, rinsing the nickel plate with deionized water, and drying for later use.
And (3) carrying out hot vulcanization molding on the nickel sheet treated by the adhesive or the primer and the silicon rubber to obtain the sheet composite material containing a layer of nickel sheet and a layer of silicon rubber. And (3) punching and cutting the sheet-shaped composite material into small wafers with the diameters of 2.5mm, 3.0mm and 5.0mm to obtain the rubber-metal composite electric contact. The inner surface (the surface combined with the silicon rubber) of the nickel sheet in each electric contact is provided with more than ten fresh metal surfaces which are etched before being combined with the silicon rubber, and the fresh surfaces are free from pollution of oil stains and the like, so that firm adhesion between the nickel sheet and the silicon rubber is ensured. And the outer surface of the nickel sheet in each electric contact is provided with small etched pits, so that the dust resistance of the electric contact is improved.
Example 4
The materials and processes used in this example were the same as in example 3, but the exposure pattern was designed such that a parallel concave line was etched into the inner and outer surfaces of a 0.10mm thick nickel plate. The depth of the concave lines is 0.025-0.035mm, and the width of the concave lines from the outer surface or the inner surface of the nickel plate is 0.2 mm. The distance between two adjacent concave lines is 0.2-0.5 mm. The concave lines in the nickel sheet are vertical to the concave lines on the outer surface of the nickel sheet.
The rubber-metal composite electric contact prepared from the nickel sheet can ensure firm adhesion between the nickel sheet and the rubber, and has good dust resistance.
Example 5
The embodiment uses a dry film process, and uses a dry film having a three-layer structure of a PE protection film, a dry film layer and a PET protection film, wherein the thickness of the dry film is 2 mil. Removing the protective film of the dry film, respectively pressing on two surfaces of a nickel sheet with the thickness of 0.10mm, exposing and developing to obtain the nickel sheet with the two surfaces covered by the dry film and exposed metal (namely nickel) small dots which are uniformly distributed. As in example 3, the diameter of the metal dots is 0.2mm and the distance between the centers of two adjacent metal dots is 0.65 mm.
The dry film is etched by the acid etching solution containing ferric trichloride used in the embodiment 3 or a plasma etching machine, small pits with the depth of about 0.03mm are etched at the small exposed metal round points, then the dry film on the nickel plate is removed, and the nickel plate is cleaned. The obtained nickel sheet and self-adhesive silicone rubber are compounded by thermal vulcanization to form a silicone rubber-nickel sheet with the thickness of 0.8 mm. When the self-adhesive silicon rubber and the nickel sheet are bonded by hot vulcanization, the nickel sheet can be bonded with the self-adhesive silicon rubber without pre-treating the nickel sheet by using an adhesive, a primer or a coupling agent. Because the surface of the nickel sheet is etched to form a fresh small circular surface before the self-adhesive silicon rubber is thermally vulcanized and bonded, the firm bonding of a production line between the self-adhesive silicon rubber and the nickel sheet is ensured, and the nickel sheet can not fall off from the silicon rubber once colliding.
And (3) punching and cutting the obtained silicon rubber-nickel sheet into small round particles with the diameter of 3mm, 5mm or other sizes to obtain the rubber-metal composite electric contact with the nickel sheet and the silicon rubber firmly bonded and having excellent dust resistance.
The foregoing will provide a clear and complete description of the embodiments of the present invention, so that those skilled in the art can better understand the advantages and features of the present invention, and thus define the protection scope of the present invention more clearly. The described embodiments of the present invention are only some embodiments, but not all embodiments, and all other embodiments obtained by the person skilled in the art without creative work belong to the scope protected by the present invention based on the embodiments of the present invention.
Claims (9)
1. A rubber and metal composite electric contact is characterized in that: the electric contact is a sheet formed by compounding rubber and a metal sheet, and the sheet is a small round sheet with the diameter of 1.0-10.0 mm; the inner surface of the metal sheet at least comprises an etched area not less than 0.01mm2The fresh surface of (a), the fresh surface being bonded to the rubber.
2. A composite rubber and metal electrical contact as in claim 1, wherein: the fresh surfaces are in a circular shape, an oval shape, a square shape and a line shape when viewed from the surface of the metal sheet, and the area of each fresh surface is not more than one fifth of the surface area of one surface of the metal sheet in the rubber and metal composite type electric contact.
3. A composite rubber and metal electrical contact as in claim 1, wherein: the fresh surface is recessed, the depth of the recess being less than one half of the thickness of the metal sheet; the concave shape is spherical crown, semispherical shape, semi-ellipsoid shape, truncated cone shape, cylindrical shape, truncated cone shape, conical shape, truncated cone shape, prismatic shape, pyramid shape or truncated pyramid shape.
4. A composite rubber and metal electrical contact as in claim 1, wherein: the inner and outer surfaces of the metal sheet are uniform in shape.
5. A composite rubber and metal electrical contact as in claim 1, wherein: the metal sheet is gold, silver, copper, zinc, molybdenum, iridium, tungsten, cobalt, nickel, indium, iron, platinum, rhodium, palladium, tin, or titanium.
6. A composite rubber and metal electrical contact as in claim 1, wherein: the thickness of the metal sheet is 0.01-0.20mm, the thickness of the rubber layer is 0.1-1.0mm, and the thickness of the rubber and metal composite type electric contact is 0.12-1.2 mm.
7. A composite rubber and metal electrical contact as in claim 1, wherein: the metal sheet, the rubber layer and the electrical contact are circular; the diameters of the metal sheet, the rubber layer and the electric contact are within the range of 1.0-10.0 mm; the diameter of the rubber layer is 0.01-5.0% larger than that of the metal sheet.
8. A composite rubber and metal electrical contact as in claim 1, wherein: the inner surface of the metal sheet is etched with a plurality of pits with the pit mouth diameter of about 0.25mm, the pits are cylindrical, truncated cone-shaped, conical, truncated pyramid-shaped, hemispherical and spherical crown-shaped, the depth of each pit is 0.025-0.035mm, and the distance between the shaft centers of two adjacent pits is about 0.75 mm.
9. A composite rubber and metal electrical contact as in claim 1, wherein: the rubber is silicon rubber: thermosetting silicone rubber or self-adhesive silicone rubber; the thickness of the silicon rubber layer is 0.1-1.0mm, the surface of the silicon rubber is flat, or the material is a cylinder, a truncated cone, a hemisphere or a cone which still has the height of the bulge of the silicon rubber of 0.01-1.0mm and the diameter of the cross section of not more than 1.0 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922321135.9U CN212342490U (en) | 2019-12-20 | 2019-12-20 | Rubber and metal composite electric contact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922321135.9U CN212342490U (en) | 2019-12-20 | 2019-12-20 | Rubber and metal composite electric contact |
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| Publication Number | Publication Date |
|---|---|
| CN212342490U true CN212342490U (en) | 2021-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922321135.9U Active CN212342490U (en) | 2019-12-20 | 2019-12-20 | Rubber and metal composite electric contact |
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|---|---|
| CN (1) | CN212342490U (en) |
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