Winding metal net, preparation method of winding metal net and application of winding metal net in preparation of touch screen and touch control screen

Abstract

The invention discloses a winding metal net, a preparation method thereof and application of the winding metal net in preparation of a touch screen and a touch screen, the winding metal net is formed by winding a conductive wire, the conductive wire comprises a high-conductivity alloy wire and an insulating layer wrapping the high-conductivity alloy wire, and the surface of the high-conductivity alloy wire is provided with a nanometer micro-concave-convex structure. The preparation method comprises the following steps: hybridizing a copper alloy through nickel and / or silver to form a high-conductivity alloy material; the high-conductivity alloy material is stretched into a wire body, and a nanometer micro-concave-convex structure is formed on the surface of the wire body; winding one obtained high-conductivity alloy wire into a shape required by the winding metal net; and wrapping the periphery of the wound high-conductivity alloy wire with an insulating layer to obtain the wound metal net. The high-conductivity alloy wire has the advantages that the high-conductivity alloy wire can easily achieve low impedance and is not prone to being damaged by ESD, a nanometer micro-concave-convex structure is formed on the surface of the high-conductivity alloy wire, the high reflectivity of metal of the high-conductivity alloy wire is reduced, and the surface of the high-conductivity alloy wire has an anti-dazzle effect; therefore, the touch screen has no Pattern display problem in the scene of direct sunlight or the scene of black, white, gray and the like.

Description

Technical Field

[0001] The invention relates to the technical field of touch screens, and in particular to a metal mesh preparation technology in a touch screen. Background Art

[0002] The structure of a touch screen generally includes a protective glass, a touch screen, and a display screen. The bonding processes of these structures are usually air-bonding, frame-bonding, and full-bonding. Due to price competition, touch screens made with frame-bonding are gradually emerging in the market. Their advantages are that they retain the low price of touch screens made with air-bonding, while also showing some of the advantages of touch screens made with full-bonding, such as high definition and touch sensitivity.

[0003] The external touch screen produced by the frame pasting process is divided into indium tin oxide (ITO), nano silver wire (SNW), metal mesh (MM) and other conductive technologies. The external capacitive screen has the advantages of high definition and high resolution, which can meet the visual needs of consumers. However, due to the pattern display problem, MM is prone to glare, and its conductive layer impedance is high, the production cost is also high, and the price is high, which affects the market competitiveness, resulting in a very low market share of this type of touch screen.

[0004] Therefore, it is urgent to develop a technical solution that can solve the pattern display problem, achieve low impedance, and be more economical, so as to significantly increase the sales of capacitive screens and improve the market share of capacitive screens. Summary of the invention

[0005] The purpose of the present invention is to provide a wound metal mesh and a preparation method thereof and its application in the preparation of touch screens and touch control screens, so as to solve the problem of low market share of capacitive screens in the prior art due to the pattern manifestation of metal mesh technology, easy glare, high impedance of the conductive layer, and high production cost.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A wound metal mesh is formed by winding conductive wires, wherein the conductive wires include high-conductivity alloy wires and an insulating layer wrapped thereon, the surface of the high-conductivity alloy wires has a nanometer micro-concave-convex structure, and the diameter of the conductive wires is 3-5 μm.

[0008] Furthermore, the winding metal mesh includes a plurality of connecting segments and a plurality of S-shaped sensing segments, the plurality of S-shaped sensing segments are arranged in parallel, and the head end of the latter S-shaped sensing segment is connected to the tail end of the former S-shaped sensing segment through the connecting segment;

[0009] The winding metal mesh is formed by winding a conductive wire and is in a plane shape as a whole.

[0010] Furthermore, the distance between two adjacent S-shaped sensing segments 12 is ≥10 μm.

[0011] The present invention also provides a method for preparing the wound metal mesh, the steps comprising:

[0012] (1) hybridizing copper alloy with nickel and / or silver to form a high-conductivity alloy material;

[0013] (2) stretching the high-conductivity alloy material into a wire and forming a nano-concave-convex structure on the surface of the wire;

[0014] (3) winding a high-conductivity alloy wire obtained in the previous step into a desired shape of the winding metal mesh;

[0015] (4) Wrapping the outer periphery of the high-conductivity alloy wire wound in the previous step with an insulating layer to obtain a wound metal mesh.

[0016] Further, the copper alloy contains 90-95wt% copper and 2-6wt% aluminum;

[0017] The amount of nickel used is 0.05 equivalent to copper, and the amount of silver used is 0.1 equivalent to copper.

[0018] Furthermore, the process of step (2) includes: stretching the high-conductivity alloy material into a wire body, and then etching the wire body to form a nano-micro concave-convex structure on its surface; the etching solution for the etching treatment is an aqueous solution containing 1.5-2wt% hydrogen peroxide and 1.5-2wt% sulfuric acid; the etching process is to immerse the wire body in the etching solution for 50-60s.

[0019] Furthermore, the process of step (2) is: selecting a wire drawing die with nano-scale micro-concave and convex structures inside, and stretching the high-conductivity alloy material into a wire body with a nano-micro-concave and convex structure on the surface.

[0020] Furthermore, the process of step (4) includes: mixing and reacting isooctyl acrylate monomer, anti-UV agent and curing agent to obtain acrylic adhesive; stirring and mixing acrylic adhesive, graphene oxide and antioxidant to obtain black insulating material, coating the black insulating material on the surface of the wound high-conductivity alloy wire, and forming a black insulating layer after curing to obtain a wound metal mesh.

[0021] Furthermore, the detailed process of step (4) includes: 20-35 parts of isooctyl acrylate monomer, 0.5-2 parts of anti-UV agent, and 5-10 parts of curing agent are stirred and reacted in a reactor at 80-90° C. to obtain an acrylic adhesive; 30-50 parts of acrylic adhesive, 30-50 parts of graphene oxide, and 4-5 parts of antioxidant are stirred and reacted at 80-90° C. to obtain a black insulating material; the black insulating material is coated on the surface of the wound high-conductivity alloy wire, and a black insulating layer is formed after curing to obtain a wound metal mesh;

[0022] The graphene oxide has a D100≤10nm.

[0023] The present invention also provides an application of the wound metal mesh in the preparation of a touch screen or a touch control screen.

[0024] Advantages of the present invention include:

[0025] 1. After different metals are hybridized, high-conductivity alloy wires can easily achieve low impedance and are not easily damaged by ESD, greatly reducing the risk of ESD damage during the stretching of high-conductivity alloy wires;

[0026] 2. The surface of the high-conductivity alloy wire forms a nano-concave and convex structure to reduce the high reflectivity of the metal, making the surface of the high-conductivity alloy wire present an anti-glare effect. With the wrapped blackened insulating layer, the touch screen has no pattern display problem regardless of whether it is in direct sunlight or in black, white, or gray. Compared with the traditional MM solution, the user's visual experience is better, the interface is uniform, and the anti-glare effect is better;

[0027] 3. The minimum distance between two adjacent S-shaped sensing segments can be up to 10 μm. The narrow spacing of the lines reaching this level can greatly improve the touch accuracy;

[0028] 4. The blackened insulating layer is made of a composite material of graphene oxide + adhesive, with graphene oxide D100 ≤ 10nm, to avoid partial conduction due to uneven stirring of graphene oxide due to excessively large particles;

[0029] 5. The cost of the touch screen prepared by using the winding metal mesh is lower than that of other touch solutions, has more price advantages, and is more compatible with the current frame pasting solution. Of course, the winding metal mesh of the present invention is also suitable for touch screens produced by other pasting solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 It is a schematic diagram of the structure of the wound metal mesh. The upper left picture is a schematic diagram of the S-shaped sensing segments arranged longitudinally, the upper right picture is a schematic diagram of the S-shaped sensing segments arranged horizontally, and the lower picture is a schematic diagram of the wound metal mesh layer from a top view;

[0032] Figure 2 It is a schematic diagram of the bonding structure of the touch screen and the display screen;

[0033] Figure 3 It is a schematic diagram of the structure of the wound metal mesh layer. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0035] Embodiment 1

[0036] A winding metal mesh (WMM) 1 is formed by winding conductive wires. The conductive wires include high-conductivity alloy wires and an insulating layer wrapped therearound. The surface of the high-conductivity alloy wires has a nanometer micro-concave-convex structure. The diameter of the conductive wires is 3-5 μm.

[0037] like Figure 1 As shown in the upper left and upper right figures, the wound metal mesh 1 includes a plurality of connecting segments 11 and a plurality of S-shaped sensing segments 12. The plurality of S-shaped sensing segments 12 are arranged in parallel, and the head end of the latter S-shaped sensing segment 12 is connected to the tail end of the former S-shaped sensing segment 12 through the connecting segment 11.

[0038] The distance between two adjacent S-shaped sensing segments 12 is ≥10 μm.

[0039] The wound metal mesh 1 is formed by winding a conductive wire and is planar in shape as a whole.

[0040] Embodiment 2

[0041] like Figure 2 As shown, the touch screen prepared by using the winding metal mesh comprises, from top to bottom, a cover plate 2, an upper optical adhesive 3, a winding metal mesh layer 4, a lower optical adhesive 5, and a substrate 6. Figure 3 As shown, the winding metal mesh layer 4 includes a middle layer of optical adhesive 41, and the upper and lower surfaces of the middle layer of optical adhesive 41 are both provided with winding metal mesh 1. Figure 1 As shown in the figure below, the S-shaped sensing segments 12 of the wound metal mesh 1 located on the upper surface of the middle optical adhesive are arranged vertically or horizontally, and the S-shaped sensing segments 12 of the wound metal mesh 1 located on the lower surface of the middle optical adhesive are arranged horizontally or vertically. Of course, those skilled in the art can make adaptive changes to the above structure based on the disclosure of this specification, such as setting a frame, etc. Figure 2 As shown, the touch screen can be mounted on the surface of the display screen 7 by blank pasting, frame pasting or full pasting to prepare a touch screen.

[0042] Embodiment 3

[0043] The present invention also provides a method for preparing the wound metal mesh, the steps comprising:

[0044] (1) hybridizing copper alloy with nickel and / or silver to form a high-conductivity alloy material;

[0045] (2) stretching the high-conductivity alloy material into a wire, and then immersing the wire in an aqueous solution containing 1.5-2wt% hydrogen peroxide and 1.5-2wt% sulfuric acid for 50-60s for etching, so that a nano-micro concave-convex structure is formed on its surface;

[0046] (3) winding a high-conductivity alloy wire obtained in the previous step into a desired shape for winding the metal mesh;

[0047] (4) Wrapping the outer periphery of the high-conductivity alloy wire wound in the previous step with an insulating layer to obtain a wound metal mesh.

[0048] The copper alloy contains 90-95wt% copper and 2-6wt% aluminum;

[0049] The amount of nickel used is 0.05 equivalent to copper, and the amount of silver used is 0.1 equivalent to copper.

[0050] The process of step (4) comprises: stirring and reacting 20-35 parts of isooctyl acrylate monomer, 0.5-2 parts of anti-UV agent and 5-10 parts of curing agent in a reaction kettle at 80-90° C. to obtain acrylic adhesive; stirring and reacting acrylic adhesive, 30-50 parts of graphene oxide and 4-5 parts of antioxidant at 80-90° C. to obtain black insulating material; coating the black insulating material on the surface of the wound high-conductivity alloy wire, and forming a black insulating layer after curing to obtain a wound metal mesh.

[0051] Graphene oxide D100≤10nm.

[0052] In some embodiments, the process of step (2) is: selecting a wire drawing die with nano-scale micro-concave and convex structures inside, and stretching the high-conductivity alloy material into a wire body with a nano-micro-concave and convex structure on the surface.

[0053] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A wound metal mesh, characterized in that: The wound metal mesh is wound by conductive wires, which include high-conductivity alloy wires and an insulating layer wrapped outside the wires. The surface of the high-conductivity alloy wires has a nanometer micro-concave-convex structure, and the diameter of the conductive wires is 3-5 μm.

2. A wound metal mesh according to claim 1, characterized in that: The winding metal mesh includes a plurality of connecting segments and a plurality of S-shaped sensing segments, the plurality of S-shaped sensing segments are arranged in parallel, and the head end of the latter S-shaped sensing segment is connected to the tail end of the former S-shaped sensing segment through the connecting segment; The winding metal mesh is formed by winding a conductive wire and is in a plane shape as a whole.

3. A wound metal mesh according to claim 2, characterized in that: The distance between two adjacent S-shaped sensing segments 12 is ≥10 μm.

4. A method for preparing a wound metal mesh as claimed in any one of claims 1 to 3, characterized in that: The steps include: (1) hybridizing copper alloy with nickel and / or silver to form a high-conductivity alloy material; (2) stretching the high-conductivity alloy material into a wire and forming a nano-concave-convex structure on the surface of the wire; (3) winding a high-conductivity alloy wire obtained in the previous step into a desired shape of the winding metal mesh; (4) Wrapping the outer periphery of the high-conductivity alloy wire wound in the previous step with an insulating layer to obtain a wound metal mesh.

5. The method for preparing a wound metal mesh according to claim 4, characterized in that: The copper alloy contains 90-95wt% copper and 2-6wt% aluminum; The amount of nickel used is 0.05 equivalent to copper, and the amount of silver used is 0.1 equivalent to copper.

6. The method for preparing a wound metal mesh according to claim 4, characterized in that: The process of step (2) comprises: stretching the high-conductivity alloy material into a wire body, and then etching the wire body to form a nano-micro concave-convex structure on its surface; the etching liquid for the etching treatment is an aqueous solution containing 1.5-2wt% hydrogen peroxide and 1.5-2wt% sulfuric acid; the etching process is to immerse the wire body in the etching liquid for 50-60s.

7. The method for preparing a wound metal mesh according to claim 4, characterized in that: The process of step (2) is: selecting a wire drawing die with nano-scale micro-concave and convex inside to stretch the high-conductivity alloy material into a wire body with a nano-micro-concave and convex structure on the surface.

8. The method for preparing a wound metal mesh according to claim 4, characterized in that: The process of step (4) includes: mixing and reacting isooctyl acrylate monomer, anti-UV agent and curing agent to obtain acrylic adhesive; stirring and mixing acrylic adhesive, graphene oxide and antioxidant to obtain black insulating material, coating the black insulating material on the surface of the wound high-conductivity alloy wire, and forming a black insulating layer after curing to obtain a wound metal mesh.

9. The method for preparing a wound metal mesh according to claim 8, characterized in that: The detailed process of step (4) includes: stirring and reacting 20-35 parts of isooctyl acrylate monomer, 0.5-2 parts of UV inhibitor, and 5-10 parts of curing agent in a reaction kettle at 80-90° C. to obtain an acrylic adhesive; stirring and reacting 30-50 parts of acrylic adhesive, graphene oxide, and 4-5 parts of antioxidant at 80-90° C. to obtain a black insulating material; coating the black insulating material on the surface of the wound high-conductivity alloy wire, and forming a black insulating layer after curing to obtain a wound metal mesh; The graphene oxide has a D100≤10nm.

10. Use of the wound metal mesh as claimed in claims 1 to 3 in the preparation of touch screens and touch control screens.

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