Coating structure and electronic device

Abstract

The application relates to a coating structure and an electronic device, the coating structure comprising a substrate and a functional layer arranged in sequence, the functional layer comprising a silver electrode layer and a moisture absorption layer for absorbing water vapor, the silver electrode layer being in contact with the moisture absorption layer, and the functional layer being provided with a barrier layer for preventing water and oxygen on the side away from the substrate. The presence of the barrier layer can isolate the silver electrode layer from water vapor and oxygen in the external environment, and the moisture absorption layer can absorb water vapor, further preventing water vapor from penetrating into the silver electrode layer through the barrier layer, so that the cooperation of the barrier layer and the moisture absorption layer can block water vapor and oxygen from entering the silver electrode layer, so that the silver electrode layer is in an isolated state from water vapor and oxygen in the external environment, thereby avoiding the occurrence of the poor chemical stability and the reduced conductivity of the silver electrode layer due to the occurrence of silver migration as much as possible, and prolonging the service life of the silver electrode layer.

Description

Technical Field

[0001] This application relates to the field of conductive circuit technology, and in particular to a coating structure and electronic device. Background Technology

[0002] Silver migration refers to the phenomenon where, in a humid environment with a DC voltage gradient, water molecules penetrate the surface of a silver-containing conductor and electrolyze to form hydrogen ions and hydroxide ions. Under the influence of the electric field and hydroxide ions, silver dissociates to produce silver ions, which migrate from high potential to low potential, forming flocculent or dendritic extensions, and forming black silver oxide at the boundary where high and low potentials connect.

[0003] Currently, the probability of silver migration in silver electrodes is increasing. Silver migration leads to a decrease in the conductivity and stability of silver electrodes, making it impossible to meet the conductivity and stability requirements of silver electrodes in products. Utility Model Content

[0004] Therefore, it is necessary to provide a coating structure that effectively blocks water vapor and oxygen from entering the silver electrode layer, thereby reducing the probability of silver migration.

[0005] This application provides a coating structure, including a substrate and a functional layer arranged in sequence. The functional layer includes a silver electrode layer and a moisture-absorbing layer for absorbing moisture. The silver electrode layer is in contact with the moisture-absorbing layer. A barrier layer for isolating water and oxygen is stacked on the side of the functional layer away from the substrate.

[0006] In one embodiment, there are at least two silver electrode layers, which are arranged at intervals along the surface of the substrate, and the moisture-absorbing layer is disposed between two adjacent silver electrode layers.

[0007] In one embodiment, the thickness of the silver electrode layer is 5 μm to 10 μm; and / or, the thickness of the moisture-absorbing layer is greater than or equal to the thickness of the silver electrode layer.

[0008] In one embodiment, the moisture-absorbing layer is selected from an aluminum oxide layer, a calcium oxide layer, or a magnesium oxide layer.

[0009] In one embodiment, the barrier layer includes a superhydrophobic layer and an oxygen barrier layer stacked together, the oxygen barrier layer being located between the superhydrophobic layer and the functional layer.

[0010] In one embodiment, the oxygen barrier layer includes an oxygen barrier layer and an oxygen absorption layer for absorbing oxygen, wherein the oxygen barrier layer and the oxygen absorption layer are stacked, and the oxygen barrier layer is located between the oxygen absorption layer and the functional layer.

[0011] In one embodiment, the oxygen barrier layer is selected from an ethylene-vinyl alcohol copolymer layer, a polyvinylidene chloride layer, an acrylic modified layer, a polyurethane layer, or a silica glass layer; and / or, the oxygen absorber layer is selected from a polymer layer containing allyl or alkynyl unsaturated functional groups; and / or, the superhydrophobic layer is selected from a fluorine-containing superhydrophobic layer, a nano silica layer, or a titanium dioxide layer.

[0012] In one embodiment, the thickness of the superhydrophobic layer is 2 μm to 10 μm; and / or, the thickness of the oxygen barrier layer is 5 μm to 10 μm; and / or, the thickness of the oxygen absorber layer is 5 μm to 10 μm.

[0013] This application also provides an electronic device that applies the coating structure described in any of the above embodiments.

[0014] In one embodiment, the electronic device includes a transparent conductive film, the transparent conductive film including the coating structure.

[0015] Compared with the prior art, the coating structure provided in this application has a barrier layer that can isolate the silver electrode layer from water vapor and oxygen in the external environment, while the moisture-absorbing layer can absorb water vapor, further preventing water vapor that has passed through the barrier layer from entering the silver electrode layer. Thus, the combination of the barrier layer and the moisture-absorbing layer can block water vapor and oxygen from entering the silver electrode layer, thereby isolating the silver electrode layer from water vapor and oxygen in the external environment. This minimizes the occurrence of silver migration that could lead to a decrease in the chemical stability and conductivity of the silver electrode layer, and extends the service life of the silver electrode layer. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a perspective view of a coating structure according to an embodiment of this application.

[0018] Reference numerals: 1. Substrate; 2. Functional layer; 21. Silver electrode layer; 22. Moisture-absorbing layer; 3. Barrier layer; 31. Superhydrophobic layer; 32. Oxygen barrier layer; 321. Oxygen barrier layer; 322. Oxygen-absorbing layer. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0020] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," "side," "top," "bottom," and similar expressions used in this application's specification are merely for describing various exemplary structural parts and elements of this application. However, their use herein is for illustrative purposes only and is determined based on the exemplary orientations shown in the accompanying drawings, and does not represent the only possible implementation. Since the embodiments disclosed in this application can be arranged in different orientations, these terms indicating orientation are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0024] like Figure 1 As shown, this application discloses a coating structure. The coating structure includes a substrate 1 and a functional layer 2 arranged in sequence. The functional layer 2 includes a silver electrode layer 21 and a moisture-absorbing layer 22 for absorbing moisture. The silver electrode layer 21 is in contact with the moisture-absorbing layer 22. A barrier layer 3 for isolating water and oxygen is stacked on the side of the functional layer 2 away from the substrate 1.

[0025] Understandably, the presence of the barrier layer 3 isolates the silver electrode layer 21 from moisture and oxygen in the external environment. The moisture-absorbing layer 22, in contact with the silver electrode layer 21, further absorbs moisture that permeates through the barrier layer 3, further preventing moisture from entering the silver electrode layer 21. Thus, the combination of the barrier layer 3 and the moisture-absorbing layer 22 blocks moisture and oxygen from entering the silver electrode layer 21, thereby isolating the silver electrode layer 21 from moisture and oxygen in the external environment. This minimizes the risk of silver migration causing a decrease in the chemical stability and conductivity of the silver electrode layer 21, extending its service life.

[0026] In some embodiments, there are at least two silver electrode layers 21, which are spaced apart along the surface of the substrate 1, and a moisture-absorbing layer 22 is provided between two adjacent silver electrode layers 21. Because there is a gap between two adjacent silver electrode layers 21 when they are spaced apart along the surface of the substrate 1, moisture can easily enter the two adjacent silver electrode layers 21 along this gap. By providing a moisture-absorbing layer 22 between two adjacent silver electrode layers 21, the gap can be eliminated, and when moisture passes through the barrier layer 3 and enters the space between two adjacent silver electrode layers 21, the moisture can be absorbed by the moisture-absorbing layer 22, preventing moisture from entering the silver electrode layers 21. This avoids the problem of moisture easily entering the silver electrode layers 21 due to the gap between them, and thus prevents silver migration.

[0027] When silver electrode layers 21 are arranged at intervals along the surface of substrate 1 and a moisture-absorbing layer 22 is provided between two adjacent silver electrode layers 21, the first and last layers of functional layer 2 can both be silver electrode layers 21. In order to better prevent moisture from entering the silver electrode layers 21, there are at least two moisture-absorbing layers 22. The moisture-absorbing layers 22 and silver electrode layers 21 are arranged alternately along the surface of substrate 1. That is, along the surface of substrate 1, the first layer of functional layer 2 is a silver electrode layer 21, and the last layer is a moisture-absorbing layer 22. Furthermore, the first and last layers of functional layer 2 are both moisture-absorbing layers 22.

[0028] like Figure 1 As shown, the direction in which the substrate 1 and the functional layer 2 are sequentially stacked is defined as the first direction A, and the direction parallel to the surface of the substrate 1 is defined as the second direction B. The second direction B is perpendicular to the first direction A. It should be noted that "arranged at intervals along the surface of the substrate 1" means "arranged at intervals along the second direction B".

[0029] The silver electrode layer 21 can be formed on the surface of the substrate 1 at corresponding positions by printing. In this embodiment, the silver electrode layer 21 is a nano-silver electrode. Furthermore, the thickness of the silver electrode layer 21 is 5 μm to 10 μm. This ensures better conductivity and thermal stability.

[0030] Further, the moisture-absorbing layer 22 is selected from an aluminum oxide layer, a calcium oxide layer, or a magnesium oxide layer. The moisture-absorbing layer 22 is formed on the corresponding position on the surface of the substrate 1 by magnetron sputtering. The thickness of the moisture-absorbing layer 22 is controlled by the magnetron sputtering time, followed by cooling and cleaning after magnetron sputtering. In this embodiment, the thickness of the moisture-absorbing layer 22 is greater than or equal to the thickness of the silver electrode layer 21. This design allows the moisture-absorbing layer 22 to better absorb moisture, thereby preventing moisture from entering the adjacent silver electrode layer 21.

[0031] In some other embodiments, a moisture-absorbing layer 22 can be used to wrap around the silver electrode layer 21, which can also prevent moisture from entering the two adjacent silver electrode layers 21 along the gap, thereby preventing silver migration.

[0032] The barrier layer 3 can be designed in various ways. Schematic, the barrier layer 3 can be a superhydrophobic layer 31 or an oxygen barrier layer 32, both of which can isolate the silver electrode layer 21 from water vapor and oxygen in the external environment. To prevent both oxygen and water vapor from entering the silver electrode layer 21, in this embodiment, preferably, the barrier layer 3 includes a superhydrophobic layer 31 and an oxygen barrier layer 32 stacked together, with the oxygen barrier layer 32 located between the superhydrophobic layer 31 and the functional layer 2. Thus, the superhydrophobic layer 31 first prevents water and other substances from entering the silver electrode layer 21, while the intermediate oxygen barrier layer 32 prevents oxygen from entering. Therefore, through the cooperation of the superhydrophobic layer 31 and the oxygen barrier layer 32, oxygen and water in the environment can be effectively prevented from entering the silver electrode layer 21, reducing the probability of the silver electrode layer 21 contacting water and oxygen and preventing silver migration.

[0033] The oxygen barrier layer 32 can be either an oxygen barrier layer 321 or an oxygen absorption layer 322. To better prevent oxygen from entering the silver electrode layer 21, in this embodiment, preferably, the oxygen barrier layer 32 includes an oxygen barrier layer 321 and an oxygen absorption layer 322 for absorbing oxygen. The oxygen barrier layer 321 and the oxygen absorption layer 322 are stacked, with the oxygen barrier layer 321 located between the oxygen absorption layer 322 and the functional layer 2. Thus, the oxygen barrier layer 321 effectively prevents oxygen from entering the silver electrode layer 21, while the presence of the oxygen absorption layer 322 absorbs oxygen when it passes through the oxygen barrier layer 321, thereby effectively preventing oxygen from entering the silver electrode layer 21.

[0034] In this embodiment, the oxygen barrier layer 321 is selected from an ethylene-vinyl alcohol copolymer (EVOH) layer, a polyvinylidene chloride (PVDC) layer, an acrylic modified layer, a polyurethane layer, or a silica glass layer. Furthermore, the thickness of the oxygen barrier layer 321 is 5 μm to 10 μm. This better prevents oxygen from entering the electrode layer.

[0035] The following explanation uses the formation of an ethylene-vinyl alcohol copolymer (EVOH) layer as an example.

[0036] First, the ethylene-vinyl alcohol copolymer solution is prepared into a solution of a certain concentration in a solvent, such as dimethyl sulfoxide or N,N-dimethylformamide. Then, the solution is coated onto the surface of the oxygen-absorbing layer 322 by spraying and then cured to form the oxygen barrier layer 321.

[0037] The oxygen-absorbing layer 322 is selected from a polymer layer containing allyl or alkynyl unsaturated functional groups. Due to the presence of allyl or alkynyl unsaturated functional groups, the material can undergo a free radical reaction with oxygen, thereby absorbing oxygen. Specifically, the polymer layer containing allyl or alkynyl unsaturated functional groups is selected from a polybutadiene layer or a poly(2-methylallylbenzothiazole thioester) layer. Furthermore, the thickness of the oxygen-absorbing layer 322 is 5 μm to 10 μm, which better achieves the purpose of oxygen absorption and prevents oxygen from entering the electrode layer.

[0038] The following explanation uses the formation of a polybutadiene layer as an example. Using water as a dispersion, an emulsifier such as sodium dodecyl sulfate or sodium alkylbenzene sulfonate is used to disperse the butadiene monomer into an emulsion state. Then, an initiator (such as sodium sulfate or sodium persulfate) is used to carry out a polymerization reaction to generate a polybutadiene emulsion. The emulsion is then coated onto the corresponding surface of functional layer 2 using a wet coating method. After curing, the corresponding oxygen-absorbing layer 322 is formed.

[0039] The superhydrophobic layer 31 is selected from fluorine (F)-containing superhydrophobic layers, nano-silica layers, or titanium dioxide layers. Specifically, it is formed on the corresponding surface of the oxygen barrier layer 321 by a wet coating method. Furthermore, the thickness of the superhydrophobic layer 31 is 2 μm to 10 μm. This allows for better prevention of moisture from the environment from entering the electrode layer.

[0040] In this embodiment, the coating structure consists of a functional layer 2 (which includes a silver electrode layer 21 and a moisture-absorbing layer 22), an oxygen-absorbing layer 322, an oxygen barrier layer 321, and a superhydrophobic layer 31, which are sequentially stacked on a substrate 1. The superhydrophobic layer 31 prevents moisture from entering the silver electrode layer 21. The oxygen barrier layer 321 effectively prevents oxygen from entering the silver electrode layer 21. The presence of the oxygen-absorbing layer 322 can absorb the oxygen that permeates through the oxygen barrier layer 321. The moisture-absorbing layer 22 is provided between two adjacent silver electrode layers 21. When moisture enters, it can be directly absorbed, thereby essentially eliminating the conditions for silver migration, reducing the probability of silver migration, and thus improving the service life and reliability of the silver electrode layer 21.

[0041] In addition, the coating structure of this utility model also protects the product that uses the coating structure, which can be an electronic device or other product with a transparent conductive film, such as a touch screen.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A coating structure, characterized in that, The material includes a substrate (1) and a functional layer (2) arranged in sequence. The functional layer (2) includes a silver electrode layer (21) and a moisture-absorbing layer (22) for absorbing water vapor. The silver electrode layer (21) is in contact with the moisture-absorbing layer (22). The functional layer (2) has a barrier layer (3) that isolates water and oxygen stacked on the side away from the substrate (1).

2. The coating structure according to claim 1, characterized in that, There are at least two silver electrode layers (21) and they are arranged at intervals along the surface of the substrate (1), with the moisture-absorbing layer (22) disposed between two adjacent silver electrode layers (21).

3. The coating structure according to claim 1, characterized in that, The thickness of the silver electrode layer (21) is 5 μm to 10 μm; and / or the thickness of the moisture-absorbing layer (22) is greater than or equal to the thickness of the silver electrode layer (21).

4. The coating structure according to claim 1, characterized in that, The moisture-absorbing layer (22) is selected from aluminum oxide layer, calcium oxide layer or magnesium oxide layer.

5. The coating structure according to any one of claims 1 to 4, characterized in that, The barrier layer (3) includes a superhydrophobic layer (31) and an oxygen barrier layer (32) stacked together, wherein the oxygen barrier layer (32) is located between the superhydrophobic layer (31) and the functional layer (2).

6. The coating structure according to claim 5, characterized in that, The oxygen barrier layer (32) includes an oxygen barrier layer (321) and an oxygen absorption layer (322) for absorbing oxygen. The oxygen barrier layer (321) and the oxygen absorption layer (322) are stacked, and the oxygen barrier layer (321) is located between the oxygen absorption layer (322) and the functional layer (2).

7. The coating structure according to claim 6, characterized in that, The oxygen barrier layer (321) is selected from ethylene-vinyl alcohol copolymer layer, polyvinylidene chloride layer, acrylic modified layer, polyurethane layer or silica glass layer.

8. The coating structure according to claim 6, characterized in that, The thickness of the superhydrophobic layer (31) is 2 μm to 10 μm; and / or, the thickness of the oxygen barrier layer (321) is 5 μm to 10 μm; and / or, the thickness of the oxygen absorber layer (322) is 5 μm to 10 μm.

9. An electronic device, characterized in that, The coating structure according to any one of claims 1 to 8 is applied.

10. The electronic device according to claim 9, characterized in that, The electronic device includes a transparent conductive film, and the transparent conductive film includes the coating structure.

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