CN214043448U - Rubber and metal composite electric contact without glue overflow - Google Patents

Abstract

The utility model discloses a rubber and metal composite electric contact without glue overflow. The rubber and metal composite electric contact without glue overflow is a circular layered compound with the thickness of 0.1-5mm and the diameter of 1-15mm, which is formed by closely combining a metal sheet layer with a plurality of through holes and a rubber layer through hot vulcanization molding. The through-holes in the foil layer are filled with rubber, but the rubber filling the through-holes does not protrude beyond the outer surface of the foil layer. There is not the isolation layer between this electrical contact's the rubber layer and the metal level, and the metal level surface does not have the glue that overflows, and in this kind of rubber that does not have the glue that overflows and the compound electrical contact of metal, the combination between rubber and the metal is firm, and the bulk strength of electrical contact is adjustable, still has good dust resistance simultaneously to electrical contact has reliable and stable electric conductivity performance.

Description

Rubber and metal composite electric contact without glue overflow

Technical Field

The utility model relates to an electrical contact material field, more specifically says, the utility model relates to a rubber and the compound electrical contact of metal that no excessive glue.

Background

The electric contact (rubber-based electric contact is also called conductive particle) is a key part in the rubber key, and the working surface of the rubber key has an electric conduction function. When the rubber key is pressed, the working surface of the electric contact contacts with a switch component such as a gold finger or a double half-moon-shaped gold point on a Printed Circuit Board (PCB), so that a PCB circuit is connected. In particular, when the rubber key is used in an automobile or an electric tool, etc., where safety concerns are concerned, the electrical contact is required to provide good electrical conduction reliability.

Us patent 6475933 "high density conductive elastomeric sheet" discloses a Highly conductive rubber adhesive sheet consisting of a conductive mesh and an elastomeric substrate filled with conductive particles, wherein the conductive particles are sub-micron sized carbonaceous materials. U.S. patent application 20040242095, "Composites recovered by wire net or mesh for light, Strength and stiffness," discloses a polymer-based or metal-based composite material reinforced with one or more networks, meshes or mesh structures. Us patent 7964810 "Electrically conductive contact and method for production of the same", chinese patent 200680015484.0 "conductive contact and method for manufacturing the same" and chinese patent 201610923294.4 "method for manufacturing a super-conductive particle" disclose an electrical contact made of a metal sponge which is at least partially infiltrated by an elastomeric material. Chinese patent 201010609386.8 "a conductive rubber and its application" discloses a method for producing an electrical contact by compounding a metal fiber sintered felt instead of a metal sponge, a metal foam or a metal mesh with a rubber. Chinese patent 201010609385.3, "method for producing conductive particles for keypad", discloses a method for preparing conductive particles for keypad by putting metal embedded parts (such as spiral metal wires) into a mold cavity and injecting polymer material by molding or injection molding. Chinese patent 201010592410.1 "composite conductive sheet" provides a conductive composite sheet composed of a polymer matrix and a metal foil compounded therein, wherein the metal foil is a nickel foil, a copper foil, an aluminum foil, a stainless steel foil, a gold foil or a silver foil containing a protruding contact and a hole, or a woven mesh of nickel wires, copper wires, aluminum wires, stainless steel wires, gold wires or silver wires containing a protruding contact and a hole. Chinese patent application 201610780383.8 entitled "composite material of polymer material and metal and process for preparing the same" and 201610781956.9 entitled "composite material and process for preparing the same" disclose respectively removing extractable substances by extraction and volatile substances in rubber by baking, so that the rubber in the composite material shrinks or collapses and the porous metal protrudes from the surface of the conductive composite material, making the composite material very suitable for use as an electrical contact material. Chinese patent 201110193369.5 "pitted surface metal and rubber composite conductive particle" provides a pitted surface metal and rubber composite conductive particle with pits and bumps. 201110027418.8 "conductive rubber particle and its preparation method" provides a conductive particle with a metal coating on the surface of a rubber substrate. Chinese patent 201210090165.3, "soft metal surface and polymer material composite conductive particle", discloses a soft metal surface and polymer material composite conductive particle. Chinese patent 201310748955.0 "switch contact element and method of making the same" discloses a three-layer layered structure switch contact element having silicone rubber, a continuous sheet of base metal, and a discontinuous precious metal coating. Chinese patent 201410346509.1 "a gold-plated switch contact and a method for manufacturing the same" discloses a switch contact having a three-layer layered structure of a hydrophobic rubber layer-a metal foil layer-a gold-plated layer and a method for manufacturing the same. Chinese patent 201410467116.6 "a plated noble metal switch contact element and a method for making the same" discloses a method for making a noble metal switch contact element by plating resist, plating and etching processes. Chinese patent 201610798351.0 "a multi-layer porous metal and polymer composite sheet" discloses a two-layer or multi-layer porous metal and polymer composite sheet, and the material compositions of both surfaces made of the composite sheet are consistent electrical contacts. Chinese patent application 201911322558.0 "a partially plated electrical contact" discloses an electrical contact having a metal coating on a partial protrusion of a metal layer. Chinese patent application 201911322759.0, "a method for improving the reliability of a rubber and metal composite electrical contact", discloses a method for improving the reliability of a rubber and metal composite electrical contact by the fresh inner surface of a metal sheet. Chinese patent application 202010679934.8, "a burr resistant electrical contact", discloses a burr resistant electrical contact in which the edge portion of the metal layer is bent towards the rubber layer.

None of these patents, mentioned above, relate to or disclose how to ensure that there is no flash on the working surface of the rubber and metal composite electrical contact. The term "flash" refers to that when the rubber-metal composite electrical contact is prepared, in the process of hot vulcanization molding, the rubber is extruded under pressure and flows to the working surface of the electrical contact, and is vulcanized and adhered to the working surface of the electrical contact. Rubber is generally electrically non-conductive, and even if it is electrically conductive, it is much less conductive than metal. Therefore, the overflow phenomenon will adversely affect the conductivity of the electrical contact. Although the rubber and metal composite type electric contact prepared by compounding the rubber and the metal sheet without the through hole can prevent the rubber from overflowing to the working surface of the electric contact and avoid the problem of glue overflow, the electric contact of the type has larger integral mechanical strength and poorer dustproof performance and oil stain resistance. Although the rubber and metal composite type electric contact prepared by compounding the rubber and the porous metal sheet (such as the metal fiber sintered felt, the foam metal or the metal sponge) has good dustproof performance and oil pollution prevention performance, the distribution stability of the metal salient points playing a conductive role in the working surface of the electric contact cannot be ensured, and the metal salient points are not covered by the rubber.

The applicant of the present patent has made research and development on ensuring the conductive reliability of a rubber and metal composite type electrical contact. In order to prevent the rubber layer from protruding out of the working surface of the electrical contact in the hot vulcanization molding compounding process of rubber and metal, chinese patent 201110335410.8 "multilayer rubber conducting plate and conducting particle" provides a multilayer rubber conducting plate and conducting particle, which is compounded by a conducting layer, a transition layer and an elastic layer (rubber layer), wherein the conducting layer and the elastic layer are completely separated by the transition layer, so as to prevent the elastic layer from protruding out of the conducting layer to influence the conducting effect, and the transition layer is equivalent to an isolating layer and is formed by a polymer film or a compact metal sheet, and plays a role of preventing rubber from penetrating to the conducting layer.

Chinese patent application 201610771886.9 entitled "polymer-based composite material and process for preparing the same" discloses a polymer-based composite material and process for preparing the same. The composite material sheet is prepared by compounding and molding a metal sheet and a polymer, and then the metal layer in the composite material sheet is etched to form holes vertical to the metal layer, while the polymer layer in the composite material sheet is not influenced by etching. The polymer-based composite material thus prepared is suitable for use as an electrical contact material for use under various weather conditions, because the metal layer having the holes uniformly covers the polymer substrate, and the polymer substrate does not thermally expand such that the polymer substrate protrudes beyond the surface of the metal layer having a thickness, that is, the thickness of the metal layer offsets the thermal expansion of the polymer substrate. However, in actual operation, the acidic conditions (such as acidic etching solution) and the alkaline conditions (alkaline deglued solution) used in the process act to destroy the adhesive strength between the electrical contact rubber and the metal, and the acidic conditions and the alkaline conditions promote the separation between the electrical contact rubber and the metal. In particular, when the metal is etched into metal lines or metal grids having a small line width (e.g., a line width of not more than 0.2 mm), the metal layer may be separated from the rubber layer by itself or may be separated from the rubber layer by a slight peeling operation by hand. The use of adhesion-promoting pre-treatments for metals, or the use of self-adhesive rubbers, does not prevent the damaging effect of the acidic and alkaline conditions used in the process on the adhesive strength between the electrical contact rubber and the metal.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: in order to improve the not enough of prior art, the utility model discloses a do not have transition layer or isolation layer between rubber and the metal, metal surface does not have the glue that overflows problem, between rubber and the metal bonding firm, anti-dust performance and anti greasy dirt performance are good to the rubber and the compound electrical contact of metal that do not have the glue that overflows that have high electric conductance reliability.

The technical scheme is as follows: the utility model provides a rubber and metal composite electric contact without glue overflow. The rubber and metal composite type electric contact without glue overflow is a circular layered compound which is formed by closely combining a metal sheet layer with a plurality of through holes and a rubber layer through hot vulcanization molding and has the thickness of 0.1-5mm and the diameter of 1-15mm, wherein the thickness of the metal sheet layer is 0.005-0.5mm, the thickness of the layered compound is 0.1-5mm, and the outer surface of the rubber layer is provided with cylindrical, pillar-shaped or prism-shaped bulges with the cross section circumscribed circle diameter of less than or equal to 1mm and the height of 0-4.75 mm; the rubber and metal composite type electric contact without glue overflow has no adhered rubber or glue overflow on the outer surface of the metal layer, so that the electric contact has stable and reliable electric conduction performance, and in the rubber and metal composite type electric contact without glue overflow, the overall strength of the electric contact can be adjusted, the combination between the rubber and the metal sheet is firm, an isolation layer or a transition layer is not arranged between the rubber and the metal sheet, and meanwhile, the electric contact has good dust resistance.

The surface of the rubber layer can be divided into an inner surface and an outer surface. The inner surface of the rubber layer refers to the surface where the rubber layer and the technical thin sheet layer are bonded, and the outer surface of the rubber layer refers to the surface exposed and corresponding to the inner surface. And when the outer surface of the rubber layer is used for preparing the rubber key containing the electric contact, the electric contact is bonded with the rubber base material. The purpose of the outer surface of the rubber layer is that a plurality of cylindrical, pillar-shaped or prism-shaped bulges with the cross section circumcircle diameter less than or equal to 1mm and the height of 0-4.75mm are arranged on the outer surface of the rubber layer, and the purpose is to increase the change of the axial linear density of the electric contact so as to ensure that the subsequent use of the electric contact is convenient and time-saving. These rubber bumps are substantially independent of the electrical conductivity of the electrical contacts.

When rubber and metal are compounded by hot vulcanization molding, the rubber flows to the outer surface of the metal under pressure and is cured and adhered to the outer surface of the metal, which is a flash phenomenon. For the through hole type metal, the phenomenon of glue overflow caused by the rubber passing through the through hole of the metal under the action of pressure is difficult to avoid. This is why the chinese patent 201110335410.8 "rubber conductive plate and conductive particles with multi-layer structure" completely separates the conductive layer and the elastic layer by applying a transition layer (polymer film or dense metal sheet) between the conductive layer (metal) and the elastic layer (rubber) to prevent the elastic layer from protruding out of the conductive layer (i.e. generate glue overflow) and thus affect the conductive effect. The transition layer, i.e. the isolation layer, prevents the rubber from overflowing through the metal holes. The increase of the number of layers in the electrical contact means that the complexity of the electrical contact preparation process is increased and the risk of delamination is increased.

The rubber is lack of conductivity, and the electric conductivity of the rubber and metal composite electric contact without glue overflow can be affected by glue overflow. The utility model discloses a there is not compound electric contact of rubber and metal of excessive glue, do not use between rubber and through hole type sheet metal and prevent that rubber from piercing through by the through-hole and crossing and produce the isolation layer or the transition layer of excessive glue phenomenon, but eliminated the excessive glue problem on the electric contact.

The utility model discloses a through-hole among rubber and the compound electrical contact foil of metal of no excessive glue fills single rubber by rubber and does not bulge in the surface on foil layer. Although the through holes in the foil are filled with rubber, there is no flash problem on the foil. Not only has no glue overflow problem, but also the utility model discloses a glue overflow-free rubber and metal compound electric contact's adhesion between the metal foil layer and the rubber is firm, the failure mode of the initial adhesion between the metal foil layer and the rubber and the adhesion failure mode after the high temperature and high humidity aging test with the temperature of 85 ℃, the relative humidity of 85% and the time of 168h are cohesive failure; when the rubber metal sheet is pulled off or peeled off, the area of the residual rubber of the rubber on the bonding surface of the metal sheet is not less than 10 percent of the total bonding area. Obviously, the phenomenon of metal-rubber separation of rubber and metal composite electrical contacts without glue overflow is a serious quality problem: not only does the electrical contact fail, but the separated metal can uncontrollably complete the circuit and lead to safety hazards.

The rubber without glue overflow and the metal composite type electric contact are characterized in that the metal sheet layer of the rubber and metal composite type electric contact is provided with a plurality of through hole type holes which are uniformly distributed or randomly distributed, the holes of the metal sheet layer are partially or completely filled with rubber, and the outer surface of the metal sheet layer is not adhered with rubber or has no glue overflow.

Furthermore, the aperture of the holes of the metal sheet layer is 50-1.0 mm, the hole interval is 25-1.0 mm, and the cross section of the holes is in a plane figure with axial symmetry or central symmetry, such as a circle, an ellipse, a rectangle, a rhombus, an isosceles trapezoid or a regular polygon.

The utility model discloses in, can carry out thermosetting shaping or thermoplasticity fashioned rubber, all can be used to prepare this no rubber and the compound electrical contact of metal that overflows and glue. More specifically, the rubber of the non-overflow rubber and the rubber of the metal composite electrical contact in the present invention is a thermosetting rubber or a thermoplastic elastomer with shore a hardness of 20-90, such as natural rubber, ethylene propylene diene rubber, acrylate rubber, urethane rubber, silicone rubber, fluorosilicone rubber, SBS or polyurethane thermoplastic elastomer.

The rubber of the glue-overflow-free rubber and the rubber of the metal composite type electric contact are colorless or colored, and the transparency is between 0 and 98 percent. Different colors and transparencies may be used as one indicia of different gauges of electrical contacts.

Preferably, the rubber in the rubber-metal composite type electric contact without flash can be prepared by vulcanizing and molding liquid silicon rubber or solid silicon rubber. Silicone rubbers are well known for their good chemical stability and elasticity.

When the rubber and the metal are subjected to hot vulcanization molding compounding, the metal can be subjected to tackifying pretreatment. Of course, the metal may not be subjected to a thickening pretreatment, and in this case, the rubber used is a self-adhesive liquid silicone rubber or a self-adhesive solid silicone rubber. The self-adhesive liquid silicone rubber or self-adhesive solid silicone rubber is liquid silicone rubber or solid silicone rubber which is compounded with a metal sheet during vulcanization molding without pretreatment for enhancing adhesion of the metal sheet.

The utility model discloses a rubber and the compound electrical contact of metal that do not have excessive gluey problem not only does not have excessive gluey, can make the working face of the compound electrical contact of rubber and metal that do not have excessive gluey in addition on, electrically conductive metal material is slightly convex, and the rubber material that does not electrically conduct is slightly sunken. That is, in the above-described rubber and metal composite type electrical contact without flash, the through-hole in the metal foil layer is filled with rubber, the rubber filling the through-hole is flush with the outer surface of the metal foil layer, or the rubber filling the through-hole is shrunk toward the rubber layer.

The rubber and metal composite type electric contact without glue overflow is made of homogeneous or heterogeneous metal materials composed of aluminum, iron, cobalt, nickel, copper, zinc, tin, manganese, tungsten, silver, gold or alloys thereof. The metal sheet may be a metal layer made of a single metal material, or a double metal layer or a multiple metal layer formed by laminating two or more metal materials. The metal sheet or the metal coating is contained; the inner surface, or both the inner and outer surfaces, of the foil are coated with a layer of an adhesion promoter, coupling agent or primer having an average thickness of no more than 1 mu.

As a special example, the metal foil used for the electrical contact is stainless steel, nickel-plated stainless steel or stainless steel plated with nickel and gold, wherein the nickel plating is between the gold plating and the stainless steel.

As a special example, the outer surface of the rubber layer is provided with three or more cylindrical, pillar-shaped, prism-shaped, hemispherical, wavy or sawtooth-shaped bulges with the circumscribed diameter of the cross section of less than or equal to 1mm and the height of 0.05-2.00 mm.

Has the advantages that: the utility model discloses a do not have the excessive glue on the metal of the compound electrical contact working face of rubber of excessive glue and metal to have reliable and stable electric conductivity performance, and, in this kind of do not have the rubber of excessive glue and the compound electrical contact of metal, do not have the isolation layer between rubber and the metal, combine firmly between rubber and the metal, the bulk strength of electrical contact is adjustable, still has good dust resistance simultaneously. In addition, the method for preparing the rubber and metal composite electric contact without glue overflow disclosed by the utility model is simple and easy to implement, the raw materials are easy to obtain, the cost is controllable, but the production has unexpected effects, and the method is particularly suitable for mass production to meet the strict performance requirements of the rubber and metal composite electric contact without glue overflow.

Drawings

FIG. 1 is a schematic cross-sectional view of a rubber-metal composite electrical contact without flash, wherein 1. rubber; 2. a metal layer; 3. a through hole; 4. the thickness of the metal; 5. the side length of the square through hole; 6. the width of metal between adjacent square through holes; 7. a cylindrical protrusion; 8. the height of the cylindrical protrusion; 9 electrical contact diameter; electrical contact thickness; 11. working faces of the electrical contacts.

FIG. 2 is a cross-sectional view of a rubber and metal composite electrical contact without flash, wherein 1. rubber; 2. a metal layer; 3. a through hole; 4. the thickness of the metal; 5. the side length of the square through hole; 6. the width of metal between adjacent square through holes; 7. a cylindrical protrusion; 8. the height of the cylindrical protrusion; 9 electrical contact diameter; electrical contact thickness; 11. a working face of the electrical contact; 12. the silicone rubber depression depth.

FIG. 3 is a schematic structural diagram of a first etched via;

FIG. 4 is a schematic structural view of a second etched via;

FIG. 5 is a schematic structural view of a third etched via;

FIG. 6 is a cross-sectional view of a rubber and metal composite electrical contact without flash, wherein 1. rubber; 2. a metal layer; 3. a through hole; 4. the thickness of the metal; 5. the side length of the square through hole; 6. the width of metal between adjacent square through holes; 7. a truncated cone-shaped protrusion; 8. height of the truncated cone-shaped protrusion; 9 electrical contact diameter; electrical contact thickness; 11. a working face of the electrical contact; 12. the silicone rubber depression depth.

Detailed Description

The present invention will be further described with reference to the following specific embodiments.

Example 1

A rubber and metal composite electric contact without glue overflow is shown in figure 1. The rubber 1 in the electric contact is silicon rubber, and the metal of the electric contactThe layer 2 is made of a stainless steel sheet material 304 having uniformly arranged square through holes 3 and having a thickness h₁0.025-0.25mm, the side length w of the square through hole₁0.1-1.0mm, the distance between adjacent square through holes (i.e. the width of metal between adjacent square through holes) w₂0.05-1.0mm, the square through holes of the metal sheet are filled with silicon rubber. Because of receiving the utility model discloses a forming process's restriction, silicon rubber does not have the surface of protrusion in sheet metal, also does not have under the pressure effect of vulcanization molding, flows to sheet metal's surface 11 that is the working face of electrical contact to there is not the excessive gluey problem that forms of silicon rubber bonding at sheet metal's surface.

The outer surface of the rubber layer of the rubber and metal composite electric contact without glue overflow is provided with 4-100 cylindrical bulges 7 with the cross section diameter of 0.25-0.75mm, and the height h of the bulges₃Is 0.2-2.0 mm. The rubber and metal composite electric contact without glue overflow is a round small piece, the total diameter D is 2-10mm, and the total height H is 0.5-2.5 mm.

In the electric contact of this embodiment, there is not the isolation layer between rubber and the metal, all do not overflow gluey phenomenon on the working face of electric contact, it is firm to combine between rubber layer and the metal level in the electric contact, the harmfulness that leads to because of overflowing gluey phenomenon has been eliminated, and because the working face of electric contact comprises metal and the soft rubber that has not salient in the metal level and has good dust resistance ability and greasy dirt resistance ability, thereby guaranteed that electric contact has reliable electric conduction performance, thereby production efficiency has been guaranteed, and production cost is saved.

Example 2

The electrical contact of example 2 was substantially the same as the electrical contact of example 1, except that since 10% to 15% of durene was added to the rubber at the time of preparing the electrical contact, and the durene was removed therefrom by baking or extraction after the electrical contact was prepared, the silicone rubber was shrunk in volume to be recessed with respect to the working surface (outer surface of the metal layer) of the electrical contact, and the electrical contact was structured as shown in fig. 2, wherein the depth h2 of the recess obtained was in the range of 0.075 to 0.20 mm.

In the same manner as described in embodiment 1, no flash phenomenon occurs on the outer surface of the metal layer of the electrical contact of this embodiment.

The electrical contact obtained in example 2 is particularly suitable for applications where the temperature changes greatly. The depression in fig. 2 can counteract the thermal expansion of the silicon rubber when the temperature changes too much, so as to ensure that the working surface of the electrical contact can contact with the corresponding switch component such as a "gold finger" or a double half-moon-shaped gold point of the PCB, thereby completing the circuit of the PCB.

Example 3

This example is substantially identical to example 1 except that the through holes in the stainless steel sheet are regular triangular (as shown in fig. 3), regular hexagonal (as shown in fig. 4) or circular (as shown in fig. 5).

In the rubber and metal composite type electric contact without glue overflow, which is prepared by preparing stainless steel sheets with uniformly distributed regular triangular, square or regular hexagonal through holes by using stainless steel sheets with the same material, thickness and hardness and further without the problem of glue overflow, under the condition that the side length and the distance between adjacent through holes are the same, the overall mechanical strength (measured by the bending resistance sensed by hands) of the electric contact prepared by the stainless steel sheets with the uniformly distributed regular triangular through holes is the largest, and the overall mechanical strength of the electric contact prepared by the stainless steel sheets with the uniformly distributed square through holes is the next to the minimum. It follows that the overall strength of this type of electrical contact can be adjusted by the type and size of the through-hole, etc.

Example 4

The conductive particle of example 4 is modified from the conductive particles of the above examples so that the electrical contact has a plating layer thereon to improve electrical performance.

The electrical contacts made of the stainless steel sheets with uniformly distributed circular through holes prepared in the above examples were subjected to electroless nickel plating, with a nickel plating layer having a thickness of 0.5 to 5 μm, or to electroless nickel plating followed by electroless gold plating, with a nickel plating layer and a gold plating layer having a thickness of 0.5 to 5 μm and 0.05 to 0.50 μm, respectively. The purpose of the chemical nickel plating or the chemical nickel plating and the gold plating is to reduce the contact resistance of the working surface of the electric contact, particularly after the chemical nickel plating, the contact resistance of the working surface of the electric contact can be obviously reduced, so that the electric conductivity and the service life of the electric contact are improved.

Example 5

The electrical contact of example 5 was substantially the same as that of example 2 except that the outer surface of the rubber layer had 4 to 100 pillar-shaped protrusions having a cross-sectional diameter of 0.25 to 0.75mm and a height h of the protrusions₃Is 0.2-2.0mm, as shown in FIG. 6.

Claims (10)

1. A rubber and metal composite electric contact without glue overflow is characterized in that a round layered compound with the diameter of 1-15mm is formed by closely combining a metal sheet layer with a plurality of through holes and a rubber layer through hot vulcanization molding, wherein the thickness of the metal sheet layer is 0.005-0.5mm, the thickness of the layered compound is 0.1-5mm, and the outer surface of the rubber layer is provided with a plurality of cylindrical, pillar-shaped, prism-shaped, hemispherical, wavy or zigzag bulges with the cross section circumscribed circle diameter of less than or equal to 1mm and the height of 0-4.75 mm; the metal sheet layer and the rubber layer are firmly combined, and no isolating layer or transition layer is arranged between the metal sheet layer and the rubber layer; the through hole in the metal sheet is filled with single rubber by rubber and does not protrude out of the outer surface of the metal sheet layer; the outer surface of the metal foil layer has no adhered rubber and no glue overflow.

2. The glue-spill-free rubber-metal composite electrical contact of claim 1, wherein: the rubber without glue overflow and the metal composite type electric contact are firmly adhered between the metal sheet layer and the rubber, and the failure mode of the initial adhesion between the metal sheet layer and the rubber and the adhesion failure mode after a high-temperature high-humidity aging test with the temperature of 85 ℃, the relative humidity of 85% and the time of 168h are cohesive failure; when the rubber metal sheet is pulled off or peeled off, the area of the residual rubber of the rubber on the bonding surface of the metal sheet is not less than 10 percent of the total bonding area.

3. The glue-spill-free rubber-metal composite electrical contact of claim 1, wherein: the rubber without glue overflow and the metal composite type electric contact are characterized in that the metal sheet layer of the rubber and metal composite type electric contact is provided with a plurality of through hole type holes which are uniformly distributed or randomly distributed, the holes of the metal sheet layer are partially or completely filled with rubber, and the outer surface of the metal sheet layer is not adhered with rubber or has no glue overflow.

4. The glue-spill-free rubber-metal composite electrical contact of claim 1, wherein: the aperture of the holes of the metal sheet layer is 50-1.0 mm, the hole interval is 25-1.0 mm, and the cross section of the holes is axisymmetric or centrosymmetric round, elliptical, rectangular, rhombic, isosceles trapezoid or regular polygon.

5. The glue-spill-free rubber-metal composite electrical contact of claim 1, wherein: the rubber of the glue-overflow-free rubber and metal composite electric contact is thermosetting rubber or thermoplastic elastomer with Shore A hardness of 20-90.

6. The rubber-metal composite electrical contact of claim 1, wherein the rubber of the rubber-metal composite electrical contact is colorless or colored, and the transparency is between 0% and 98%.

7. The composite rubber-metal electrical contact of claim 1, wherein the through-hole in the metal foil layer is filled with rubber, the rubber filling the through-hole is flush with the outer surface of the metal foil layer, or the rubber filling the through-hole shrinks toward the rubber layer.

8. The rubber-metal composite electrical contact of claim 1, wherein the metal sheet of the rubber-metal composite electrical contact is a metal layer made of a single metal material, or a double metal layer or multiple metal layers formed by laminating two or more metal materials.

9. The composite rubber and metal electrical contact of claim 1, wherein the metal foil used for the electrical contact is stainless steel, nickel-plated stainless steel, or nickel and gold-plated stainless steel.

10. The glue-spill-free rubber-metal composite electrical contact of claim 1, wherein: the outer surface of the rubber layer is provided with a plurality of cylindrical, pillar-shaped, prism-shaped, hemispherical, wavy or sawtooth-shaped bulges with the circumscribed diameter of the cross section less than or equal to 1mm and the height of 0.05-2.00 mm.

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