Preparation method of conductive rubber

Abstract

The invention discloses a preparation method of conductive rubber. The preparation method comprises the following steps: cleaning and airing the surface of a metal sheet; polishing, cleaning and airing the bonding surface of the rubber body; the surface of the treated metal sheet is coated with conductive glue, and the treated metal sheet is placed for a first preset time; coating conductive glue on the bonding surface of the treated rubber body, and standing for a second preset time; wherein the conductive glue comprises metal powder; and bonding the metal sheet between the bonding surfaces of the two layers of rubber bodies, and carrying out vulcanization treatment to obtain the conductive rubber. According to the technical scheme, the metal powder is added into the conductive glue, and the metal sheet is laid in the rubber body, so that the conductivity of the prepared conductive rubber can be enhanced, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of rubber, and in particular to a method for preparing conductive rubber. Background Art

[0002] At present, conductive rubber is widely used in the electronics industry. Most conductive rubbers used on the market are resin adhesives. However, in actual applications, the bonding strength of resin adhesives under dynamic conditions and high temperature conditions is low. In addition, after the resin adhesive is cured, its bonding surface is brittle and easy to crack, causing the vulcanized rubber to separate from the bonded surface and the bonding to fail, thereby affecting the conductive performance and shortening the service life. Summary of the invention

[0003] The purpose of the embodiment of the present invention is to provide a method for preparing conductive rubber, by adding metal powder to conductive glue and laying metal sheets in the rubber body, the conductive performance of the prepared conductive rubber can be enhanced and the service life can be extended.

[0004] In order to achieve the above object, an embodiment of the present invention provides a method for preparing a conductive rubber, comprising:

[0005] Clean and dry the surface of the metal sheet;

[0006] Grind, clean and dry the bonding surface of the rubber body;

[0007] Applying conductive glue on the surface of the treated metal sheet and leaving it there for a first preset time;

[0008] Applying conductive glue on the bonding surface of the treated rubber body and leaving it for a second preset time; wherein the conductive glue includes metal powder;

[0009] The metal sheet is bonded between the bonding surfaces of the two rubber bodies and vulcanized to obtain the conductive rubber.

[0010] Furthermore, the cleaning and drying of the surface of the metal sheet specifically includes:

[0011] Use acetone to clean the surface of the metal sheet;

[0012] The cleaned metal sheets are air-dried.

[0013] Furthermore, the grinding, cleaning and drying of the bonding surface of the rubber body specifically includes:

[0014] Use 100-grit sandpaper to grind the bonding surface of the rubber body;

[0015] Use ethanol to clean the bonding surface of the polished rubber body;

[0016] The cleaned rubber body is air-dried.

[0017] Furthermore, the first preset time is 20 to 30 minutes, and the thickness of the glue layer formed on the surface of the metal sheet is 15 to 20 μm.

[0018] Furthermore, the second preset time is 10 to 20 minutes, and the thickness of the glue layer formed on the bonding surface of the rubber body is 20 to 30 μm.

[0019] Furthermore, the conductive glue is composed of ethylene block copolymer, resin and metal powder, wherein the content of ethylene block copolymer is 50%, the content of resin is 30%, and the content of metal powder is 20%.

[0020] Furthermore, the step of bonding the metal sheet between the bonding surfaces of the two rubber bodies and vulcanizing the metal sheet to obtain the conductive rubber specifically includes:

[0021] The metal sheet is bonded between the bonding surfaces of the two rubber bodies and placed on a heating plate for vulcanization to obtain a conductive rubber; wherein the vulcanization temperature is 100-150° C., the vulcanization pressure is 5-10 MPa, and the vulcanization time is 40-50 min.

[0022] Furthermore, the width of the metal sheet is 2-3 mm; when there are more than one metal sheet bonded between the two layers of the rubber body, the interval between adjacent metal sheets is 1.0-2.0 cm.

[0023] Furthermore, the metal sheet is a copper sheet.

[0024] Furthermore, the rubber body is chloroprene rubber.

[0025] Compared with the prior art, the embodiment of the present invention provides a method for preparing conductive rubber, first, the surface of the metal sheet is cleaned and dried, and the bonding surface of the rubber body is polished, cleaned and dried; then, conductive glue is coated on the surface of the treated metal sheet and placed for a first preset time, and conductive glue is coated on the bonding surface of the treated rubber body and placed for a second preset time, wherein the conductive glue used includes metal powder; finally, the metal sheet is bonded between the bonding surfaces of the two layers of the rubber body and vulcanized to obtain the conductive rubber. The embodiment of the present invention can enhance the conductive performance of the prepared conductive rubber and extend its service life by adding metal powder to the conductive glue and laying the metal sheet in the rubber body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1The present invention is a flowchart of a preferred embodiment of a method for preparing a conductive rubber. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this technical field without creative work are within the scope of protection of the present invention.

[0028] The present invention provides a method for preparing a conductive rubber. Figure 1 FIG. 1 is a flow chart of a preferred embodiment of a method for preparing a conductive rubber provided by the present invention, wherein the method comprises steps S11 to S15:

[0029] Step S11, cleaning and drying the surface of the metal sheet;

[0030] Step S12, grinding, cleaning and drying the bonding surface of the rubber body;

[0031] Step S13, coating the surface of the treated metal sheet with conductive glue and leaving it for a first preset time;

[0032] Step S14, coating the treated adhesive surface of the rubber body with conductive glue and leaving it for a second preset time; wherein the conductive glue includes metal powder;

[0033] Step S15, bonding the metal sheet between the bonding surfaces of the two layers of rubber body, and performing vulcanization treatment to obtain conductive rubber.

[0034] In the specific implementation, first, the surface of the metal sheet is cleaned and dried for standby use, and the bonding surface of the rubber body is polished, cleaned, and dried for standby use; then, a layer of conductive glue is coated on the treated surface of the metal sheet and left to stand for a first preset time, and a layer of conductive glue is coated on the treated bonding surface of the rubber body and left to stand for a second preset time, wherein the conductive glue used on the surface of the metal sheet and the bonding surface of the rubber body includes metal powder; finally, the metal sheet is bonded between the bonding surfaces of the two layers of the rubber body, and vulcanization is performed after bonding to obtain the conductive rubber.

[0035] It should be noted that the conductive rubber finally obtained is composed of a first rubber body, a metal sheet and a second rubber body, the metal sheet is located between the first rubber body and the second rubber body, and the contact surface (i.e., bonding surface) between the three is bonded by conductive glue; based on this, in the actual process of preparing the conductive rubber, when executing step S12 and step S14, only one bonding surface of the rubber body needs to be processed accordingly, that is, one bonding surface of the first rubber body is polished, cleaned and dried in turn, conductive glue is applied to the bonding surface of the treated first rubber body, and the conductive glue is placed for a second preset time for standby use, one bonding surface of the second rubber body is polished, cleaned and dried in turn, and the conductive glue is applied to the bonding surface of the treated second rubber body. Conductive glue is coated on the bonding surface of the first rubber body, and the bonding surface is placed for a second preset time before use; when executing step S11 and step S13, the two opposite surfaces of the metal sheet need to be treated accordingly, that is, the two opposite surfaces of the metal sheet are cleaned and dried, and conductive glue is coated on the two opposite surfaces of the treated metal sheet, and the bonding surface is placed for a first preset time before use; when executing step S15, the bonding surface of the first rubber body coated with conductive glue can be bonded to one surface of the metal sheet, and the bonding surface of the second rubber body coated with conductive glue can be bonded to the other surface of the metal sheet, so as to achieve bonding of the metal sheet between the bonding surfaces of the two rubber bodies, and vulcanization treatment is performed after bonding to obtain conductive rubber accordingly.

[0036] In another preferred embodiment, the cleaning and drying of the surface of the metal sheet specifically includes:

[0037] Use acetone to clean the surface of the metal sheet;

[0038] The cleaned metal sheets are air-dried.

[0039] Specifically, in combination with the above embodiment, when cleaning and drying the surface of the metal sheet, the surface of the metal sheet can be cleaned with acetone first, generally 2 to 3 times, and then the cleaned metal sheet can be dried.

[0040] In another preferred embodiment, the grinding, cleaning and drying of the bonding surface of the rubber body specifically includes:

[0041] Use 100-grit sandpaper to grind the bonding surface of the rubber body;

[0042] Use ethanol to clean the bonding surface of the polished rubber body;

[0043] The cleaned rubber body is air-dried.

[0044] Specifically, in combination with the above embodiment, when the bonding surface of the rubber body is polished, cleaned and dried, the bonding surface of the rubber body can be polished with 100-mesh sandpaper first, and then the bonding surface of the rubber body after the polishing treatment is cleaned with ethanol. Generally, it can be cleaned 2 to 3 times, and then the cleaned rubber body is dried.

[0045] In yet another preferred embodiment, the first preset time is 20 to 30 minutes, and the thickness of the glue layer formed on the surface of the metal sheet is 15 to 20 μm.

[0046] Specifically, in combination with the above embodiment, after a layer of conductive glue is coated on the surface of the treated metal sheet, the exposure time of the metal sheet (i.e., the first preset time) is 20 minutes to 30 minutes, and accordingly, the thickness of the glue layer formed on the surface of the metal sheet is 15 μm to 20 μm.

[0047] Exemplarily, the air-drying time of the metal sheet can be 20 minutes, 21 minutes, 22 minutes, 23 minutes, 24 minutes, 25 minutes, 26 minutes, 27 minutes, 28 minutes, 29 minutes or 30 minutes, and can also be set according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0048] Exemplarily, the thickness of the glue layer formed on the surface of the metal sheet may be 15 μm, 16 μm, 17 μm, 18 μm, 19 μm or 20 μm, and may also be set according to actual needs, which is not specifically limited in the embodiment of the present invention.

[0049] In another preferred embodiment, the second preset time is 10 to 20 minutes, and the thickness of the glue layer formed on the bonding surface of the rubber body is 20 to 30 μm.

[0050] Specifically, in combination with the above embodiment, after a layer of conductive glue is coated on the bonding surface of the treated rubber body, the exposure time of the rubber body (i.e., the second preset time) is 10 min to 20 min, and accordingly, the thickness of the glue layer formed on the bonding surface of the rubber body is 20 μm to 30 μm.

[0051] Exemplarily, the air-drying time of the rubber body can be 10 minutes, 11 minutes, 12 minutes, 13 minutes, 14 minutes, 15 minutes, 16 minutes, 17 minutes, 18 minutes, 19 minutes or 20 minutes, and can also be set according to actual needs, which is not specifically limited in the embodiment of the present invention.

[0052] Exemplarily, the thickness of the glue layer formed on the bonding surface of the rubber body can be 20μm, 21μm, 22μm, 23μm, 24μm, 25μm, 26μm, 27μm, 28μm, 29μm or 30μm, and can also be set according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0053] In another preferred embodiment, the conductive glue is composed of ethylene block copolymer, resin and metal powder, wherein the content of ethylene block copolymer is 50%, the content of resin is 30% and the content of metal powder is 20%.

[0054] Specifically, in combination with the above-mentioned embodiment, the conductive glue used on the surface of the metal sheet and the bonding surface of the rubber body is composed of ethylene block copolymer, resin (such as rosin) and metal powder, and the content of ethylene block copolymer is 50%, the content of resin is 30%, and the content of metal powder is 20%.

[0055] In another preferred embodiment, the step of bonding the metal sheet between the bonding surfaces of the two rubber bodies and vulcanizing the metal sheet to obtain the conductive rubber specifically includes:

[0056] The metal sheet is bonded between the bonding surfaces of the two rubber bodies and placed on a heating plate for vulcanization to obtain a conductive rubber; wherein the vulcanization temperature is 100-150° C., the vulcanization pressure is 5-10 MPa, and the vulcanization time is 40-50 min.

[0057] Specifically, in combination with the above embodiment, after the metal sheet is bonded between the bonding surfaces of the two layers of rubber body, the bonded electrostatic rubber sheet can be placed on a heating plate and vulcanized at a vulcanization temperature of 100°C to 150°C, a vulcanization pressure of 5MPa to 10MPa, and a vulcanization time of 40min to 50min to obtain a conductive rubber.

[0058] Exemplarily, the vulcanization temperature may be 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C or 150°C, and may also be set according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0059] Exemplarily, the value of the vulcanization pressure may be 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa or 10 MPa, and may also be set according to actual needs, which is not specifically limited in the embodiment of the present invention.

[0060] Exemplarily, the vulcanization time may be 40 minutes, 41 minutes, 42 minutes, 43 minutes, 44 minutes, 45 minutes, 46 minutes, 47 minutes, 48 ​​minutes, 49 minutes or 50 minutes, and may also be set according to actual needs, which is not specifically limited in the embodiment of the present invention.

[0061] In another preferred embodiment, the width of the metal sheet is 2-3 mm; when there are more than one metal sheet bonded between the two layers of the rubber body, the interval between adjacent metal sheets is 1.0-2.0 cm.

[0062] Specifically, in combination with the above embodiment, the width of the metal sheet used is 2mm to 3mm, and the thickness and length are not specifically limited. Furthermore, when the number of metal sheets bonded between the two rubber bodies is more than one, the interval between two adjacent metal sheets is 1.0cm to 2.0cm.

[0063] It should be noted that when there are more than one metal sheets bonded between the two rubber bodies, all the metal sheets can be arranged in parallel between the two rubber bodies without overlapping each other, and the interval between every two adjacent metal sheets is 1.0 cm to 2.0 cm.

[0064] Exemplarily, the width of the metal sheet may be 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm or 3 mm, and may also be set according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0065] Exemplarily, the interval between adjacent metal sheets may be 1.0 cm, 1.1 cm, 1.2 cm, 1.3 cm, 1.4 cm, 1.5 cm, 1.6 cm, 1.7 cm, 1.8 cm, 1.9 cm or 2.0 cm, and may also be set according to actual needs, which is not specifically limited in the embodiments of the present invention.

[0066] As a preferred solution, the metal sheet is a copper sheet.

[0067] Specifically, in combination with the above embodiments, the metal sheet used in the embodiments of the present invention is generally a copper sheet, and other types of metal sheets may also be used as the conductive sheet, which is not specifically limited in the embodiments of the present invention.

[0068] As a preferred solution, the rubber body is chloroprene rubber.

[0069] Specifically, in combination with the above embodiments, considering the adhesion and strength of rubber, the rubber body used in the embodiments of the present invention is preferably chloroprene rubber, and other types of rubber may also be used, which is not specifically limited in the embodiments of the present invention.

[0070] It should be noted that the peel strength of the conductive rubber prepared by the above embodiment can reach 15.5 KN / m, and the 90° peel strength can reach 30.5 KN / m.

[0071] In combination with all the above embodiments, the implementation process of the present scheme is described below through the first specific embodiment, including: (1) using acetone to clean the surface of the metal sheet, and drying the cleaned metal sheet for standby use; (2) using 100-mesh sandpaper to grind the bonding surface of the rubber body, using ethanol to clean the polished bonding surface of the rubber body, and drying the cleaned rubber body for standby use; (3) coating the surface of the treated metal sheet with conductive glue, and after leaving it for 20 minutes, a glue layer with a thickness of 15 μm is formed on the surface of the metal sheet; (4) coating the bonding surface of the treated rubber body with conductive glue, and after leaving it for 10 minutes, a conductive layer is formed on the bonding surface of the rubber body. (5) bonding a metal sheet between the bonding surfaces of the two rubber bodies and placing the metal sheet on a heating plate to vulcanize the metal sheet at a vulcanization temperature of 100°C, a vulcanization pressure of 5 MPa and a vulcanization time of 40 min, thereby obtaining a conductive rubber; wherein the metal sheet is a copper sheet and the width of the metal sheet is 2 mm; when the number of metal sheets bonded between the two rubber bodies is more than one, the interval between adjacent metal sheets is 1.0 cm; and the rubber body is chloroprene rubber.

[0072] In combination with all the above embodiments, the implementation process of the present solution is described below through a second specific embodiment, including: (1) using acetone to clean the surface of the metal sheet, and drying the cleaned metal sheet for standby use; (2) using 100-mesh sandpaper to grind the bonding surface of the rubber body, using ethanol to clean the polished bonding surface of the rubber body, and drying the cleaned rubber body for standby use; (3) coating the surface of the treated metal sheet with conductive glue, and after leaving it for 25 minutes, a glue layer with a thickness of 17 μm is formed on the surface of the metal sheet; (4) coating the bonding surface of the treated rubber body with conductive glue, and after leaving it for 15 minutes, a conductive layer with a thickness of 17 μm is formed on the bonding surface of the rubber body. A glue layer with a thickness of 25 μm; wherein the conductive glue used is composed of ethylene block copolymer, resin and metal powder, and the content of ethylene block copolymer is 50%, the content of resin is 30%, and the content of metal powder is 20%; (5) bonding a metal sheet between the bonding surfaces of the two layers of rubber body and placing it on a heating plate, and vulcanizing it with vulcanization parameters of vulcanization temperature of 125° C., vulcanization pressure of 8 MPa, and vulcanization time of 45 min to obtain a conductive rubber; wherein the metal sheet used is a copper sheet, and the width of the metal sheet is 2.5 mm; when the number of metal sheets bonded between the two layers of rubber body is more than one, the interval between adjacent metal sheets is 1.5 cm; the rubber body used is chloroprene rubber.

[0073] In combination with all the above embodiments, the implementation process of the present solution is described below through a third specific embodiment, including: (1) using acetone to clean the surface of the metal sheet, and drying the cleaned metal sheet for standby use; (2) using 100-mesh sandpaper to grind the bonding surface of the rubber body, using ethanol to clean the polished bonding surface of the rubber body, and drying the cleaned rubber body for standby use; (3) coating the surface of the treated metal sheet with conductive glue, and after leaving it for 30 minutes, a glue layer with a thickness of 20 μm is formed on the surface of the metal sheet; (4) coating the bonding surface of the treated rubber body with conductive glue, and after leaving it for 20 minutes, a conductive layer is formed on the bonding surface of the rubber body. (5) bonding a metal sheet between the bonding surfaces of the two rubber bodies and placing the metal sheet on a heating plate to vulcanize the metal sheet at a vulcanization temperature of 150°C, a vulcanization pressure of 10 MPa and a vulcanization time of 50 min, thereby obtaining a conductive rubber; wherein the metal sheet is a copper sheet and the width of the metal sheet is 3 mm; when the number of metal sheets bonded between the two rubber bodies is more than one, the interval between adjacent metal sheets is 2.0 cm; and the rubber body is chloroprene rubber.

[0074] In summary, the method for preparing a conductive rubber provided by an embodiment of the present invention includes first cleaning and drying the surface of a metal sheet, and polishing, cleaning and drying the bonding surface of a rubber body; then, applying conductive glue on the treated surface of the metal sheet and leaving it for a first preset time, and applying conductive glue on the bonding surface of the treated rubber body and leaving it for a second preset time, wherein the conductive glue used includes metal powder; finally, bonding the metal sheet between the bonding surfaces of two layers of rubber bodies and performing vulcanization treatment to obtain conductive rubber. The embodiment of the present invention can enhance the conductive performance of the prepared conductive rubber and extend its service life by adding metal powder to the conductive glue and laying the metal sheet in the rubber body.

[0075] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a conductive rubber, characterized in that: include: Clean and dry the surface of the metal sheet; Grind, clean and dry the bonding surface of the rubber body; Applying conductive glue on the surface of the treated metal sheet and leaving it there for a first preset time; Applying conductive glue on the bonding surface of the treated rubber body and leaving it for a second preset time; wherein the conductive glue includes metal powder; The metal sheet is bonded between the bonding surfaces of the two rubber bodies and vulcanized to obtain the conductive rubber.

2. The method for preparing the conductive rubber according to claim 1, characterized in that: The cleaning and drying of the surface of the metal sheet specifically includes: Use acetone to clean the surface of the metal sheet; The cleaned metal sheets are dried.

3. The method for preparing the conductive rubber according to claim 1, characterized in that: The grinding, cleaning and drying of the bonding surface of the rubber body specifically includes: Use 100-grit sandpaper to grind the bonding surface of the rubber body; Use ethanol to clean the bonding surface of the polished rubber body; The cleaned rubber body is air-dried.

4. The method for preparing the conductive rubber according to claim 1, characterized in that: The first preset time is 20 to 30 minutes, and the thickness of the glue layer formed on the surface of the metal sheet is 15 to 20 μm.

5. The method for preparing the conductive rubber according to claim 1, characterized in that: The second preset time is 10 to 20 minutes, and the thickness of the glue layer formed on the bonding surface of the rubber body is 20 to 30 μm.

6. The method for preparing the conductive rubber according to claim 1, characterized in that: The conductive glue is composed of ethylene block copolymer, resin and metal powder, wherein the content of ethylene block copolymer is 50%, the content of resin is 30% and the content of metal powder is 20%.

7. The method for preparing the conductive rubber according to claim 1, characterized in that: The step of bonding the metal sheet between the bonding surfaces of the two rubber bodies and vulcanizing the metal sheet to obtain the conductive rubber specifically includes: The metal sheet is bonded between the bonding surfaces of the two rubber bodies and placed on a heating plate for vulcanization to obtain a conductive rubber; wherein the vulcanization temperature is 100-150° C., the vulcanization pressure is 5-10 MPa, and the vulcanization time is 40-50 min.

8. The method for preparing the conductive rubber according to claim 1, characterized in that: The width of the metal sheet is 2-3 mm; when the number of metal sheets bonded between the two layers of rubber bodies is more than one, the interval between adjacent metal sheets is 1.0-2.0 cm.

9. The method for preparing a conductive rubber according to any one of claims 1 to 8, characterized in that: The metal sheet is a copper sheet.

10. The method for preparing a conductive rubber according to any one of claims 1 to 8, characterized in that: The rubber body is chloroprene rubber.

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