Film coating method for rubber surface

Abstract

The invention discloses a rubber surface coating method which comprises the following steps: cleaning the surface of a rubber product, and placing the cleaned rubber product in a vacuum chamber; the method comprises the following steps: heating an acrylate monomer in a heating chamber so that the acrylate monomer is converted into a gaseous state; when the vacuum degree in the vacuum cavity ranges from 0.2 Pa to 0.25 Pa, acrylic ester gas is introduced into the vacuum cavity, and the air pressure in the vacuum cavity is adjusted to range from 0.3 Pa to 0.4 Pa; argon is introduced into the vacuum chamber, so that the vacuum degree in the vacuum chamber reaches 1-1.5 Pa, and a physical vapor deposition method is adopted to perform coating treatment on the surface of the rubber product to form a coating layer; wherein the coating layer comprises a metal film and an associated film of acrylic ester. According to the technical scheme, the binding force between the coating layer and the rubber product can be increased, and the coating layer on the surface of the rubber product is effectively prevented from falling off and being broken.

Description

Technical Field

[0001] The present invention relates to the field of coating technologies, and particularly to a coating method for the surface of rubber. Background Art

[0002] In the production and manufacturing of electronic products, anti-static treatment is often required to prevent the accumulated charges from damaging semiconductor components. The traditional method is to combine rubber products with metals; recently, the method widely adopted in the industry is to directly sputter coat metals on the surface of rubber products, that is, using vacuum coating technology, under vacuum conditions, by using specific means such as chemistry and physics to organically convert metal materials, making the metal materials into particles, depositing or adsorbing on the surface of rubber products to form a conductive coating. However, metals and rubber often do not bond well, resulting in the coating on the surface of rubber products being prone to peeling and cracking. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a coating method for the surface of rubber, which can increase the bonding force between the coating layer and the rubber product, and effectively prevent the coating layer on the surface of the rubber product from peeling and cracking.

[0004] To achieve the above purpose, the embodiments of the present invention provide a coating method for the surface of rubber, including:

[0005] Clean the surface of the rubber product, and place the cleaned rubber product in a vacuum chamber;

[0006] Place acrylate monomers in a heating chamber for heating to convert the acrylate monomers into a gaseous state;

[0007] When the vacuum degree in the vacuum chamber is 0.2 - 0.25 Pa, introduce acrylate gas into the vacuum chamber, and adjust the air pressure in the vacuum chamber to 0.3 - 0.4 Pa;

[0008] Introduce argon gas into the vacuum chamber to make the vacuum degree in the vacuum chamber reach 1 - 1.5 Pa, and use physical vapor deposition to coat the surface of the rubber product to form a coating layer; wherein, the coating layer includes a metal film and an associated film of acrylate.

[0009] Further, the cleaning treatment of the surface of the rubber product specifically includes:

[0010] Clean the surface of the rubber product with deionized water.

[0011] Further, the acrylate monomers are converted into a gaseous state at a temperature of 90°C - 150°C.

[0012] Further, the flow rate of the acrylate gas is 5 - 9 sccm.

[0013] Further, the flow rate of the argon gas is 500 - 600 sccm.

[0014] Further, during the coating process, the voltage is 8 - 12 kV, the current is 1.5 - 2 A, and the coating time is 20 - 25 min.

[0015] Further, the thickness of the coating layer is 40 - 50 μm.

[0016] Further, the film material of the metal film is any one of aluminum, copper, titanium, silver, nickel, indium, and tin.

[0017] Compared with the prior art, the embodiment of the present invention provides a method for coating the surface of rubber. First, the surface of the rubber product is cleaned and the cleaned rubber product is placed in a vacuum chamber. Then, the acrylate monomer is placed in a heating chamber for heating to convert the acrylate monomer into a gaseous state. Then, when the vacuum degree in the vacuum chamber is 0.2 - 0.25 Pa, the acrylate gas is introduced into the vacuum chamber, and the air pressure in the vacuum chamber is adjusted to 0.3 - 0.4 Pa. Finally, argon gas is introduced into the vacuum chamber to make the vacuum degree in the vacuum chamber reach 1 - 1.5 Pa, and physical vapor deposition is used to perform coating treatment on the surface of the rubber product to form a coating layer, wherein the coating layer includes a metal film and an associated film of acrylate. The embodiment of the present invention can increase the bonding force between the coating layer and the rubber product, and effectively prevent the coating layer on the surface of the rubber product from falling off and breaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a flowchart of a preferred embodiment of a method for coating the surface of rubber provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the technical field of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] The embodiment of the present invention provides a method for coating the surface of rubber. Refer to Figure 1 as shown, which is a flowchart of a preferred embodiment of a method for coating the surface of rubber provided by the present invention. The method includes steps S11 to S14:

[0021] Step S11: Clean the surface of the rubber product and place the cleaned rubber product in a vacuum chamber;

[0022] Step S12: Place the acrylate monomer in a heating chamber and heat it to convert the acrylate monomer into a gaseous state;

[0023] Step S13: When the vacuum degree in the vacuum chamber is 0.2 - 0.25 Pa, introduce acrylate gas into the vacuum chamber and adjust the air pressure in the vacuum chamber to 0.3 - 0.4 Pa;

[0024] Step S14: Introduce argon gas into the vacuum chamber to make the vacuum degree in the vacuum chamber reach 1 - 1.5 Pa, and perform film coating treatment on the surface of the rubber product by physical vapor deposition method to form a coating layer; wherein, the coating layer includes a metal film and an associated film of acrylate.

[0025] In specific implementation, first, clean the surface of the rubber product and place the cleaned rubber product in a vacuum chamber; then, place the acrylate monomer in a heating chamber and perform heating treatment to turn the acrylate monomer into a gaseous state by heating; then, perform vacuum pumping operation on the vacuum chamber. When the vacuum degree in the vacuum chamber reaches 0.2 Pa - 0.25 Pa, open the heating chamber to introduce acrylate gas into the vacuum chamber and adjust the air pressure in the vacuum chamber to 0.3 Pa - 0.4 Pa. At this time, the acrylate gas fills the entire vacuum chamber; finally, introduce argon gas into the vacuum chamber to make the vacuum degree in the vacuum chamber reach 1 Pa - 1.5 Pa, and perform ion bombardment film coating treatment on the surface of the rubber product by physical vapor deposition method. After the ion bombardment is completed, a coating layer is formed on the surface of the rubber product accordingly, and the coating layer includes a metal film and an associated film of acrylate.

[0026] It should be noted that in the embodiment of the present invention, by using acrylate monomer, after vaporizing it, plasma is generated by glow discharge, the chemical bonds of the gaseous acrylate monomer are broken, and active groups are produced. The active groups can form a corrosion-resistant associated thin film in the metal film, thus making up for the defects of the metal film. It can not only increase the bonding force between the coating layer and the rubber product, but also improve the corrosion resistance and toughness of the coating layer, thereby effectively preventing the coating layer on the surface of the rubber product from falling off and breaking.

[0027] In one optional embodiment, the cleaning treatment of the surface of the rubber product specifically includes:

[0028] Clean the surface of the rubber product with deionized water.

[0029] Specifically, in combination with the above embodiments, when cleaning the surface of the rubber product, deionized water can be used to clean the surface of the rubber product, or other cleaning means can also be adopted. The embodiments of the present invention do not make specific limitations.

[0030] In one optional embodiment, the acrylate monomer is converted into a gaseous state at a temperature of 90°C to 150°C.

[0031] Specifically, in combination with the above embodiments, when heating the heating chamber, the temperature can be heated to the range of 90°C to 150°C, so that the acrylate monomer becomes gaseous at a temperature of 90°C to 150°C.

[0032] Exemplarily, the heating temperature can be 90°C, 100°C, 110°C, 120°C, 130°C, 140°C or 150°C, and can also be set according to actual needs. The embodiments of the present invention do not make specific limitations.

[0033] In one optional embodiment, the flow rate of the acrylate gas is 5 to 9 sccm.

[0034] Specifically, in combination with the above embodiments, when introducing the acrylate gas into the vacuum chamber, the flow rate of the acrylate gas is in the range of 5 sccm to 9 sccm.

[0035] Exemplarily, the flow rate of the acrylate gas can be 5 sccm, 6 sccm, 7 sccm, 8 sccm or 9 sccm, and can also be set according to actual needs. The embodiments of the present invention do not make specific limitations.

[0036] In one optional embodiment, the flow rate of the argon gas is 500 to 600 sccm.

[0037] Specifically, in combination with the above embodiments, when introducing the argon gas into the vacuum chamber, the flow rate of the argon gas is in the range of 500 sccm to 600 sccm.

[0038] Exemplarily, the flow rate of the argon gas can be 500 sccm, 510 sccm, 520 sccm, 530 sccm, 540 sccm, 550 sccm, 560 sccm, 570 sccm, 580 sccm, 590 sccm or 600 sccm, and can also be set according to actual needs. The embodiments of the present invention do not make specific limitations.

[0039] In one optional embodiment, the voltage during the coating process is 8 to 12 kV, the current is 1.5 to 2 A, and the coating time is 20 to 25 min.

[0040] Specifically, in combination with the above embodiments, when performing ion bombardment coating treatment on the surface of rubber products by physical vapor deposition, a high-power medium-frequency pulse or a high-power DC power supply can be used. Under the conditions of a voltage of 8 kV to 12 kV and a current of 1.5 A to 2 A, argon gas is ionized and bombards the surface of the rubber products, and the bombardment time is in the range of 20 min to 25 min.

[0041] Exemplarily, the value of the voltage can be 8 kV, 9 kV, 10 kV, 11 kV or 12 kV, and it can also be set according to actual needs. The embodiments of the present invention do not make specific limitations.

[0042] Exemplarily, the value of the current can be 1.5 A, 1.6 A, 1.7 A, 1.8 A, 1.9 A or 2 A, and it can also be set according to actual needs. The embodiments of the present invention do not make specific limitations.

[0043] Exemplarily, the value of the bombardment time can be 20 min, 21 min, 22 min, 23 min, 24 min or 25 min, and it can also be set according to actual needs. The embodiments of the present invention do not make specific limitations.

[0044] In one optional embodiment, the thickness of the coating layer is 40 - 50 μm.

[0045] Specifically, in combination with the above embodiments, after the ion bombardment is completed, the thickness of the coating layer formed on the surface of the rubber products is in the range of 40 μm to 50 μm.

[0046] Exemplarily, the value of the thickness of the coating layer can be 40 μm, 41 μm, 42 μm, 43 μm, 44 μm, 45 μm, 46 μm, 47 μm, 48 μm, 49 μm or 50 μm, and it can also be set according to actual needs. The embodiments of the present invention do not make specific limitations.

[0047] In one optional embodiment, the film material of the metal film is any one of aluminum, copper, titanium, silver, nickel, indium, and tin.

[0048] Specifically, in combination with the above embodiments, when performing ion bombardment coating treatment on the surface of rubber products by physical vapor deposition, the metal material used is any one of aluminum, copper, titanium, silver, nickel, indium, and tin. Correspondingly, the film material of the metal film formed on the surface of the rubber products is any one of aluminum, copper, titanium, silver, nickel, indium, and tin.

[0049] Combining all the above embodiments, the implementation process of this solution is described below through the first specific embodiment, including: (1) cleaning the surface of the rubber product with deionized water and placing the cleaned rubber product in a vacuum chamber; (2) placing the acrylate monomer in a heating chamber and performing a heating treatment to turn the acrylate monomer into a gaseous state at a temperature of 90 °C through heating; (3) performing a vacuum pumping operation on the vacuum chamber. When the vacuum degree in the vacuum chamber reaches 0.2 Pa, open the heating chamber to introduce the acrylate gas into the vacuum chamber. The flow rate of the acrylate gas is 5 sccm, and adjust the air pressure in the vacuum chamber to 0.3 Pa. At this time, the acrylate gas fills the entire vacuum chamber; (4) introduce argon into the vacuum chamber. The flow rate of argon is 500 sccm to make the vacuum degree in the vacuum chamber reach 1 Pa. Using a high-power medium-frequency pulse or a high-power DC power supply, under the conditions of a voltage of 8 kV and a current of 1.5 A, ionize the argon, and use physical vapor deposition to perform ion bombardment coating treatment on the surface of the rubber product. The bombardment time is 20 min. After the ion bombardment is completed, a coating layer with a thickness of 40 μm is formed on the surface of the rubber product accordingly. This coating layer includes a metal film and an associated film of acrylate, and the film material of the metal film is any one of aluminum, copper, titanium, silver, nickel, indium, and tin.

[0050] Combining all the above embodiments, the implementation process of this solution is described below through the second specific embodiment, including: (1) cleaning the surface of the rubber product with deionized water and placing the cleaned rubber product in a vacuum chamber; (2) placing the acrylate monomer in a heating chamber and performing a heating treatment to turn the acrylate monomer into a gaseous state at a temperature of 120 °C through heating; (3) performing a vacuum pumping operation on the vacuum chamber. When the vacuum degree in the vacuum chamber reaches 0.22 Pa, open the heating chamber to introduce the acrylate gas into the vacuum chamber. The flow rate of the acrylate gas is 7 sccm, and adjust the air pressure in the vacuum chamber to 0.35 Pa. At this time, the acrylate gas fills the entire vacuum chamber; (4) introduce argon into the vacuum chamber. The flow rate of argon is 550 sccm to make the vacuum degree in the vacuum chamber reach 1.3 Pa. Using a high-power medium-frequency pulse or a high-power DC power supply, under the conditions of a voltage of 10 kV and a current of 1.7 A, ionize the argon, and use physical vapor deposition to perform ion bombardment coating treatment on the surface of the rubber product. The bombardment time is 22 min. After the ion bombardment is completed, a coating layer with a thickness of 45 μm is formed on the surface of the rubber product accordingly. This coating layer includes a metal film and an associated film of acrylate, and the film material of the metal film is any one of aluminum, copper, titanium, silver, nickel, indium, and tin.

[0051] Combining all the above embodiments, the implementation process of this solution is described below through a third specific embodiment, including: (1) Cleaning the surface of the rubber product with deionized water and placing the cleaned rubber product in a vacuum chamber; (2) Placing the acrylate monomer in a heating chamber and performing a heating treatment, so that the acrylate monomer becomes gaseous at a temperature of 150°C through heating; (3) Performing a vacuum pumping operation on the vacuum chamber. When the vacuum degree in the vacuum chamber reaches 0.25 Pa, open the heating chamber to introduce the acrylate gas into the vacuum chamber. The flow rate of the acrylate gas is 9 sccm, and the air pressure in the vacuum chamber is adjusted to 0.4 Pa. At this time, the acrylate gas fills the entire vacuum chamber; (4) Introducing argon into the vacuum chamber. The flow rate of argon is 600 sccm to make the vacuum degree in the vacuum chamber reach 1.5 Pa. Using a high-power medium-frequency pulse or a high-power DC power supply, under the conditions of a voltage of 12 kV and a current of 2 A, ionize the argon, and use physical vapor deposition to perform ion bombardment coating treatment on the surface of the rubber product. The bombardment time is 25 min. After the ion bombardment is completed, a coating layer with a thickness of 50 μm is formed on the surface of the rubber product accordingly. The coating layer includes a metal film and an associated film of acrylate, and the film material of the metal film is any one of aluminum, copper, titanium, silver, nickel, indium, and tin.

[0052] In summary, for a coating method for the surface of rubber provided by the embodiments of the present invention, first, clean the surface of the rubber product and place the cleaned rubber product in a vacuum chamber; then, place the acrylate monomer in a heating chamber for heating so that the acrylate monomer is converted into a gaseous state; then, when the vacuum degree in the vacuum chamber is 0.2 - 0.25 Pa, introduce the acrylate gas into the vacuum chamber and adjust the air pressure in the vacuum chamber to 0.3 - 0.4 Pa; finally, introduce argon into the vacuum chamber to make the vacuum degree in the vacuum chamber reach 1 - 1.5 Pa, and use physical vapor deposition to perform coating treatment on the surface of the rubber product to form a coating layer, wherein the coating layer includes a metal film and an associated film of acrylate. The embodiments of the present invention can not only increase the bonding force between the coating layer and the rubber product, but also improve the corrosion resistance and toughness of the coating layer, thereby effectively preventing the coating layer on the surface of the rubber product from falling off and breaking.

[0053] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A method for coating a rubber surface, characterized in that: include: Cleaning the surface of the rubber product and placing the cleaned rubber product in a vacuum chamber; placing the acrylic acid ester monomer in a heating chamber for heating so that the acrylic acid ester monomer is converted into a gaseous state; When the vacuum degree in the vacuum chamber is 0.2-0.25 Pa, introducing acrylic ester gas into the vacuum chamber, and adjusting the air pressure in the vacuum chamber to 0.3-0.4 Pa; Argon gas is introduced into the vacuum chamber to make the vacuum degree in the vacuum chamber reach 1-1.5 Pa, and a coating treatment is performed on the surface of the rubber product by physical vapor deposition to form a coating layer; wherein the coating layer includes a metal film and an associated film of acrylate.

2. The method for coating a rubber surface as claimed in claim 1, characterized in that: The cleaning treatment of the surface of the rubber product specifically includes: Use deionized water to clean the surface of rubber products.

3. The method for coating a rubber surface as claimed in claim 1, characterized in that: The acrylic acid ester monomer is converted into a gaseous state at a temperature of 90° C. to 150° C.

4. The method for coating a rubber surface as claimed in claim 1, characterized in that: The flow rate of the acrylic ester gas is 5 to 9 sccm.

5. The method for coating a rubber surface as claimed in claim 1, characterized in that: The flow rate of the argon gas is 500-600 sccm.

6. The method for coating a rubber surface as claimed in claim 1, characterized in that: The voltage during the coating treatment is 8-12 kV, the current is 1.5-2 A, and the coating time is 20-25 min.

7. The method for coating a rubber surface as claimed in claim 1, characterized in that: The thickness of the coating layer is 40-50 μm.

8. The method for coating a rubber surface as claimed in claim 1, characterized in that: The film material of the metal film is any one of aluminum, copper, titanium, silver, nickel, indium and tin.

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