A high-durability electromagnetic shielding film and preparation method thereof

Abstract

The present invention discloses an electromagnetic shielding film with high durability and a preparation method thereof, which relates to the technical field of electromagnetic shielding materials and comprises a composite material base layer, a metal oxide layer, a metal seed layer, a metal conductive layer, a conductive adhesive layer and a release film; the present invention prepares the composite material base layer by doping a ceramic material with a metal material, and the electromagnetic shielding film has good mechanical properties and electromagnetic shielding properties, and by plating a metal seed layer on the metal oxide layer, not only can the conductivity of the electromagnetic shielding film be improved, but also the composite material base layer can be effectively protected, and in addition, by using a metal alloy as the conductive layer, the electromagnetic shielding property of the electromagnetic shielding film can be further improved, and the release film is bonded to the metal conductive layer by the conductive adhesive layer to improve the structural strength, so that the electromagnetic shielding film can take into account both optical transmittance and electromagnetic shielding property, and the durability is also improved, which can meet the high requirements of modern electronic equipment for electromagnetic shielding materials.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic shielding materials, and in particular to an electromagnetic shielding film with high durability and a preparation method thereof. Background Art

[0002] With the rapid development of electronic technology, electronic equipment is becoming more and more sophisticated and its applications are becoming more and more extensive. Electromagnetic radiation pollution has become ubiquitous. Electromagnetic radiation can cause mutual interference between electronic devices and between components inside devices, affecting the normal operation of the equipment and posing potential harm to the human body. Therefore, how to better protect against electromagnetic interference is a very worthy research issue.

[0003] Electromagnetic shielding film is an important functional material. When electromagnetic waves radiate to the surface of the shielding film, it will change the transmission direction of the electromagnetic waves and effectively block the propagation of various electromagnetic waves such as radio waves, infrared waves, and ultraviolet waves. It is widely used in the protection of modern electronic equipment to resist electromagnetic interference and electromagnetic radiation. With the development of electronic information technology, the research and application of electromagnetic shielding materials is particularly important. Electromagnetic shielding films can attenuate electromagnetic waves through different mechanisms, mainly including reflection loss, absorption loss, and multiple reflection attenuation.

[0004] Most of the existing electromagnetic shielding films have complex preparation processes, high costs, and poor flexibility and corrosion resistance, resulting in insufficient durability and short service life. In addition, the existing electromagnetic shielding films do not have excellent mechanical properties and electromagnetic shielding properties, and the mechanical stability and shielding effectiveness need to be improved. At the same time, they cannot take into account both optical transmittance and electromagnetic shielding performance, and it is difficult to meet the high requirements of modern electronic equipment for electromagnetic shielding materials. Therefore, the present invention proposes a highly durable electromagnetic shielding film and a preparation method thereof to solve the problems existing in the prior art. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to propose an electromagnetic shielding film with high durability and a method for preparing the same, so as to solve the problems that the existing electromagnetic shielding film has a complex preparation process, high cost, poor flexibility and corrosion resistance, resulting in insufficient durability, short service life, and lack of excellent mechanical properties and electromagnetic shielding performance.

[0006] In order to achieve the purpose of the present invention, the present invention is implemented through the following technical scheme: a highly durable electromagnetic shielding film, including a composite material base layer, a metal oxide layer, a metal seed layer, a metal conductive layer, a conductive adhesive layer and a release film, wherein the composite material base layer, the metal oxide layer, the metal seed layer, the metal conductive layer, the conductive adhesive layer and the release film are distributed in sequence from bottom to top.

[0007] A further improvement is that the composite material base layer is made of a ceramic material doped with a metal material, the ceramic material is selected from one of silicon carbide, boron nitride or zinc oxide, and the metal material is selected from one of metal copper, metal aluminum or metal iron.

[0008] A further improvement is that the constituent material of the metal oxide layer is selected from one of iron oxide, copper oxide or aluminum oxide.

[0009] A further improvement is that the constituent material of the metal seed layer is selected from one of metal nickel or metal silver.

[0010] A further improvement is that the constituent material of the metal conductive layer is selected from one of aluminum-iron alloy, copper-aluminum alloy or copper-iron alloy.

[0011] A further improvement is that the constituent material of the conductive adhesive layer is conductive glue, which is made of conductive particles dispersed in an organic adhesive, the conductive particles are selected from one of silver metal particles, copper metal particles or nickel metal particles, and the organic adhesive is selected from one of epoxy resin adhesive or polyurethane adhesive.

[0012] A further improvement is that the release film is made of a material selected from polyethylene terephthalate, polypropylene or polyvinyl chloride.

[0013] A method for preparing an electromagnetic shielding film with high durability comprises the following steps:

[0014] Step 1: firstly, a metal oxide layer is plated on the surface of the composite material substrate layer by physical vapor deposition technology, then a metal seed layer is magnetron sputtered on the surface of the metal oxide layer, and then a metal conductive layer is electroplated on the surface of the metal seed layer by electroplating;

[0015] Step 2: Then, a conductive adhesive layer is coated on the surface of the metal conductive layer, and the release film is bonded to the surface of the conductive adhesive layer through the conductive adhesive layer, and the electromagnetic shielding film is obtained after curing.

[0016] A further improvement is that in step one, the composite material base layer is cleaned and pretreated before use. The specific steps are: first, the composite material base layer is placed in deionized water for ultrasonic cleaning using ultrasonic cleaning technology, and then placed in a drying oven for drying after ultrasonic cleaning, and then a high-energy laser beam is irradiated to the surface of the composite material base layer to utilize the photothermal effect to remove pollutants and complete the cleaning pretreatment.

[0017] The beneficial effects of the present invention are as follows: the present invention forms a composite material base layer by doping a ceramic material with a metal material, and the electromagnetic shielding film has good mechanical properties and electromagnetic shielding properties, and by plating a metal seed layer on the metal oxide layer, not only can the conductivity of the electromagnetic shielding film be improved, but also the composite material base layer can be effectively protected. In addition, the use of a metal alloy as a conductive layer can further improve the electromagnetic shielding performance of the electromagnetic shielding film, and the release film is bonded to the metal conductive layer through a conductive adhesive layer to improve the structural strength, so that the electromagnetic shielding film can take into account both optical transmittance and electromagnetic shielding performance, and the durability is also improved, which increases the service life to a certain extent and can meet the high requirements of modern electronic equipment for electromagnetic shielding materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the cross-sectional structure of the electromagnetic shielding film of the present invention.

[0020] Among them: 1. composite material base layer; 2. metal oxide layer; 3. metal seed layer; 4. metal conductive layer; 5. conductive adhesive layer; 6. release film. DETAILED DESCRIPTION

[0021] 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 field without creative work are within the scope of protection of the present invention.

[0022] Embodiment 1

[0023] See also Figure 1The present embodiment provides an electromagnetic shielding film with high durability, comprising a composite material base layer 1, a metal oxide layer 2, a metal seed layer 3, a metal conductive layer 4, a conductive adhesive layer 5 and a release film 6, wherein the metal oxide layer 2 is located on the upper surface of the composite material base layer 1, the metal seed layer 3 is located on the upper surface of the metal oxide layer 2, the metal conductive layer 4 is located on the upper surface of the metal seed layer 3, and the release film 6 is bonded and fixed to the upper surface of the metal conductive layer 4 through the conductive adhesive layer 5. In the present embodiment, the thickness of the composite material base layer 1 is 30um, the thickness of the metal oxide layer 2 is 50nm, the thickness of the metal seed layer 3 is 25nm, the thickness of the metal conductive layer 4 is 60nm, the thickness of the conductive adhesive layer 5 is 20nm, and the thickness of the release film 6 is 25um. In the present embodiment, the composite material base layer 1 is made of ceramic material doped with metal material, the doping mass ratio of the ceramic material to the metal material is 2:1, the ceramic material is silicon carbide, and the metal material is metal copper. The composite material base layer 1 is made of ceramic material doped with metal material, and the high hardness and wear resistance of the ceramic are combined with the wear resistance of the metal. The good plasticity and strength of the metal are combined to make the electromagnetic shielding film have good mechanical properties and electromagnetic shielding properties. The constituent material of the metal oxide layer 2 is iron oxide, and the constituent material of the metal seed layer 3 is metal nickel. By plating the metal seed layer 3 on the metal oxide layer 2, not only the conductivity of the electromagnetic shielding film can be improved, but also the composite material base layer 1 can be effectively protected. The constituent material of the metal conductive layer 4 is aluminum-iron alloy. The metal alloy is used as the conductive layer to further improve the electromagnetic shielding performance of the electromagnetic shielding film. The constituent material of the conductive adhesive layer 5 is conductive glue. The conductive glue is made of conductive particles dispersed in an organic adhesive. The conductive particles are silver metal particles, and the organic adhesive is an epoxy resin adhesive. The conductive adhesive layer 5 is made of conductive particles combined with an organic adhesive, which can effectively improve the bonding strength between the release film 6 and the metal conductive layer 4. The constituent material of the release film 6 is polyethylene terephthalate. Polyethylene terephthalate is used as the release film 6 to cover the surface of the electromagnetic shielding film, which has the advantages of high transparency and high durability.

[0024] This embodiment also provides a method for preparing an electromagnetic shielding film with high durability, comprising the following steps:

[0025] Step 1: firstly, a metal oxide layer 2 is plated on the surface of the composite material base layer 1 by physical vapor deposition technology, and then a metal seed layer 3 is magnetron sputtered on the surface of the metal oxide layer 2, and then a metal conductive layer 4 is electroplated on the surface of the metal seed layer 3 by electroplating. The composite material base layer 1 is cleaned and pretreated before use. The specific steps are: firstly, the composite material base layer 1 is placed in deionized water for ultrasonic cleaning by ultrasonic cleaning technology, and then placed in a drying oven for drying after ultrasonic cleaning, and then a high-energy laser beam is irradiated to the surface of the composite material base layer 1 to remove pollutants by photothermal effect, and the cleaning pretreatment is completed to ensure the cleanliness of the composite material base layer 1, and to improve the preparation quality of the electromagnetic shielding film to a certain extent;

[0026] Step 2: Then, a conductive adhesive layer 5 is coated on the surface of the metal conductive layer 4, and a release film 6 is bonded to the surface of the conductive adhesive layer 5 through the conductive adhesive layer 5, and an electromagnetic shielding film is obtained after curing.

[0027] Embodiment 2

[0028] See also Figure 1The present embodiment provides an electromagnetic shielding film with high durability, comprising a composite material base layer 1, a metal oxide layer 2, a metal seed layer 3, a metal conductive layer 4, a conductive adhesive layer 5 and a release film 6, wherein the metal oxide layer 2 is located on the upper surface of the composite material base layer 1, the metal seed layer 3 is located on the upper surface of the metal oxide layer 2, the metal conductive layer 4 is located on the upper surface of the metal seed layer 3, and the release film 6 is bonded and fixed to the upper surface of the metal conductive layer 4 through the conductive adhesive layer 5. In the present embodiment, the thickness of the composite material base layer 1 is 30um, the thickness of the metal oxide layer 2 is 50nm, the thickness of the metal seed layer 3 is 25nm, the thickness of the metal conductive layer 4 is 60nm, the thickness of the conductive adhesive layer 5 is 20nm, and the thickness of the release film 6 is 25um. In the present embodiment, the composite material base layer 1 is made of ceramic material doped with metal material, the doping mass ratio of the ceramic material to the metal material is 2:1, the ceramic material is boron nitride, and the metal material is metal aluminum. The composite material base layer 1 is made of ceramic material doped with metal material, and the high hardness of the ceramic The good strength and wear resistance are combined with the good plasticity and strength of the metal, so that the electromagnetic shielding film has good mechanical properties and electromagnetic shielding properties. The constituent material of the metal oxide layer 2 is copper oxide, and the constituent material of the metal seed layer 3 is metallic silver. By plating the metal seed layer 3 on the metal oxide layer 2, not only the conductivity of the electromagnetic shielding film can be improved, but also the composite material base layer 1 can be effectively protected. The constituent material of the metal conductive layer 4 is copper-aluminum alloy. The metal alloy is used as the conductive layer to further improve the electromagnetic shielding performance of the electromagnetic shielding film. The constituent material of the conductive adhesive layer 5 is conductive glue. The conductive glue is made of conductive particles dispersed in an organic adhesive. The conductive particles are copper metal particles, and the organic adhesive is a polyurethane adhesive. The conductive adhesive layer 5 is made of conductive particles combined with an organic adhesive, which can effectively improve the bonding strength between the release film 6 and the metal conductive layer 4. The constituent material of the release film 6 is polypropylene. Polypropylene is used as the release film 6 to cover the surface of the electromagnetic shielding film, which has the advantages of high transparency and high durability.

[0029] This embodiment also provides a method for preparing an electromagnetic shielding film with high durability, comprising the following steps:

[0030] Step 1: firstly, a metal oxide layer 2 is plated on the surface of the composite material base layer 1 by physical vapor deposition technology, and then a metal seed layer 3 is magnetron sputtered on the surface of the metal oxide layer 2, and then a metal conductive layer 4 is electroplated on the surface of the metal seed layer 3 by electroplating. The composite material base layer 1 is cleaned and pretreated before use. The specific steps are: firstly, the composite material base layer 1 is placed in deionized water for ultrasonic cleaning by ultrasonic cleaning technology, and then placed in a drying oven for drying after ultrasonic cleaning, and then a high-energy laser beam is irradiated to the surface of the composite material base layer 1 to remove pollutants by photothermal effect, and the cleaning pretreatment is completed to ensure the cleanliness of the composite material base layer 1, and to improve the preparation quality of the electromagnetic shielding film to a certain extent;

[0031] Step 2: Then, a conductive adhesive layer 5 is coated on the surface of the metal conductive layer 4, and a release film 6 is bonded to the surface of the conductive adhesive layer 5 through the conductive adhesive layer 5, and an electromagnetic shielding film is obtained after curing.

[0032] Embodiment 3

[0033] See also Figure 1 The present embodiment provides an electromagnetic shielding film with high durability, comprising a composite material base layer 1, a metal oxide layer 2, a metal seed layer 3, a metal conductive layer 4, a conductive adhesive layer 5 and a release film 6, wherein the metal oxide layer 2 is located on the upper surface of the composite material base layer 1, the metal seed layer 3 is located on the upper surface of the metal oxide layer 2, the metal conductive layer 4 is located on the upper surface of the metal seed layer 3, and the release film 6 is bonded and fixed to the upper surface of the metal conductive layer 4 through the conductive adhesive layer 5. In the present embodiment, the thickness of the composite material base layer 1 is 30um, the thickness of the metal oxide layer 2 is 50nm, the thickness of the metal seed layer 3 is 25nm, the thickness of the metal conductive layer 4 is 60nm, the thickness of the conductive adhesive layer 5 is 20nm, and the thickness of the release film 6 is 25um. In the present embodiment, the composite material base layer 1 is made of ceramic material doped with metal material, the doping mass ratio of the ceramic material to the metal material is 2:1, the ceramic material is zinc oxide, and the metal material is metal iron. The composite material base layer 1 is made of ceramic material doped with metal material, and the high hardness of the ceramic The wear resistance is combined with the good plasticity and strength of the metal, so that the electromagnetic shielding film has good mechanical properties and electromagnetic shielding properties. The constituent material of the metal oxide layer 2 is aluminum oxide, and the constituent material of the metal seed layer 3 is metal nickel. By plating the metal seed layer 3 on the metal oxide layer 2, not only the conductivity of the electromagnetic shielding film can be improved, but also the composite material base layer 1 can be effectively protected. The constituent material of the metal conductive layer 4 is copper-iron alloy. The metal alloy is used as the conductive layer to further improve the electromagnetic shielding performance of the electromagnetic shielding film. The constituent material of the conductive adhesive layer 5 is conductive glue. The conductive glue is made of conductive particles dispersed in an organic adhesive. The conductive particles are nickel metal particles, and the organic adhesive is an epoxy resin adhesive. The conductive adhesive layer 5 is made of conductive particles combined with an organic adhesive, which can effectively improve the bonding strength between the release film 6 and the metal conductive layer 4. The constituent material of the release film 6 is polyvinyl chloride. Polyvinyl chloride is used as the release film 6 to cover the surface of the electromagnetic shielding film, which has the advantages of high transparency and high durability.

[0034] This embodiment also provides a method for preparing an electromagnetic shielding film with high durability, comprising the following steps:

[0035] Step 1: firstly, a metal oxide layer 2 is plated on the surface of the composite material base layer 1 by physical vapor deposition technology, and then a metal seed layer 3 is magnetron sputtered on the surface of the metal oxide layer 2, and then a metal conductive layer 4 is electroplated on the surface of the metal seed layer 3 by electroplating. The composite material base layer 1 is cleaned and pretreated before use. The specific steps are: firstly, the composite material base layer 1 is placed in deionized water for ultrasonic cleaning by ultrasonic cleaning technology, and then placed in a drying oven for drying after ultrasonic cleaning, and then a high-energy laser beam is irradiated to the surface of the composite material base layer 1 to remove pollutants by photothermal effect, and the cleaning pretreatment is completed to ensure the cleanliness of the composite material base layer 1, and to improve the preparation quality of the electromagnetic shielding film to a certain extent;

[0036] Step 2: Then, a conductive adhesive layer 5 is coated on the surface of the metal conductive layer 4, and a release film 6 is bonded to the surface of the conductive adhesive layer 5 through the conductive adhesive layer 5, and an electromagnetic shielding film is obtained after curing.

[0037] The electromagnetic shielding films prepared in Example 1, Example 2 and Example 3 of the present invention were tested and compared with the existing electromagnetic shielding films (comparison samples) on the market. The results are shown in Table 1 below:

[0038] Table 1 Test results

[0039]

[0040] It can be seen from Table 1 above that the electromagnetic shielding films prepared in Example 1, Example 2 and Example 3 of the present invention are significantly superior to the existing electromagnetic shielding films on the market in terms of electromagnetic shielding performance, mechanical properties and light transmittance.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly durable electromagnetic shielding film, characterized in that: The invention comprises a composite material base layer (1), a metal oxide layer (2), a metal seed layer (3), a metal conductive layer (4), a conductive adhesive layer (5) and a release film (6), wherein the composite material base layer (1), the metal oxide layer (2), the metal seed layer (3), the metal conductive layer (4), the conductive adhesive layer (5) and the release film (6) are arranged in sequence from bottom to top; the composite material base layer (1) is made of a ceramic material doped with a metal material, the ceramic material is selected from one of silicon carbide, boron nitride or zinc oxide, the metal material is selected from one of metal copper, metal aluminum or metal iron, the constituent material of the metal oxide layer (2) is selected from one of iron oxide, copper oxide or aluminum oxide, the constituent material of the metal seed layer (3) is selected from one of metal nickel or metal silver, and the constituent material of the metal conductive layer (4) is selected from one of aluminum-iron alloy, copper-aluminum alloy or copper-iron alloy.

2. The electromagnetic shielding film with high durability according to claim 1, characterized in that: The conductive adhesive layer (5) is made of a conductive adhesive, wherein the conductive adhesive is made of conductive particles dispersed in an organic adhesive, wherein the conductive particles are selected from one of silver metal particles, copper metal particles or nickel metal particles, and the organic adhesive is selected from one of epoxy resin adhesive or polyurethane adhesive.

3. The electromagnetic shielding film with high durability according to claim 1, characterized in that: The release film (6) is made of a material selected from the group consisting of polyethylene terephthalate, polypropylene or polyvinyl chloride.

4. A method for preparing a highly durable electromagnetic shielding film as claimed in claim 1, characterized in that: The following steps are involved: Step 1: firstly, a metal oxide layer (2) is plated on the surface of the composite material substrate layer (1) by physical vapor deposition technology, then a metal seed layer (3) is magnetron sputtered on the surface of the metal oxide layer (2), and then a metal conductive layer (4) is electroplated on the surface of the metal seed layer (3) by electroplating; Step 2: Then, a conductive adhesive layer (5) is coated on the surface of the metal conductive layer (4), and a release film (6) is bonded to the surface of the conductive adhesive layer (5) through the conductive adhesive layer (5), and after curing, an electromagnetic shielding film is obtained.

5. The method for preparing a high-durability electromagnetic shielding film according to claim 4, characterized in that: In the step 1, the composite material base layer (1) is cleaned and pretreated before use. The specific steps are: first, ultrasonic cleaning technology is used to place the composite material base layer (1) in deionized water for ultrasonic cleaning, and then the composite material base layer (1) is placed in a drying oven for drying after ultrasonic cleaning. Then, a high-energy laser beam is irradiated onto the surface of the composite material base layer (1) to remove pollutants by utilizing the photothermal effect, thereby completing the cleaning pretreatment.

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