A winding metal mesh, its preparation method and its application in the preparation of touch screens and touch panels

Abstract

The present invention discloses a winding metal mesh, a preparation method thereof, and an application thereof in the preparation of a touch screen and a touch panel. The winding metal mesh is formed by winding conductive wires. The conductive wires include high-conductivity alloy wires and insulating layers wrapped outside the high-conductivity alloy wires. The surface of the high-conductivity alloy wires has nano-micro concavo-convex structures. The steps of the preparation method include: hybridizing a copper alloy with nickel and / or silver to form a high-conductivity alloy material; stretching the high-conductivity alloy material into a wire body and forming nano-micro concavo-convex structures on the surface of the wire body; winding one of the obtained high-conductivity alloy wires into the shape required for the winding metal mesh; and wrapping an insulating layer around the wound high-conductivity alloy wire to obtain the winding metal mesh. The advantages include: the high-conductivity alloy wires can easily achieve low impedance and are not easily damaged by ESD. Nano-micro concavo-convex structures are formed on the surface of the high-conductivity alloy wires, reducing the high reflectivity of the metal, so that the surface of the high-conductivity alloy wires presents an anti-glare effect. With the wrapped blackened insulating layer, there is no problem of Pattern manifestation on the touch screen whether in the scene of direct sunlight or in scenes such as black, white, and gray.

Description

Technical Field

[0001] The present invention relates to the technical field of touch screens, and particularly to the preparation technology of metal meshes in touch screens. 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 processes. Due to price competition, the touch screens prepared by the frame bonding process are gradually emerging in the market. Its advantage is that it not only retains the low price of the touch screens prepared by air bonding, but also presents some advantages of the touch screens prepared by full bonding, such as high definition and touch sensitivity.

[0003] The external touch screens produced by the frame bonding process are classified by conductive technology into indium tin oxide (ITO), nanosilver wire (SNW), metal mesh (MM), etc. The external capacitive touch screens have the advantages of high definition and high resolution, and can meet the visual needs of consumers. However, due to the Pattern manifestation problem of MM, glare is likely to occur, and its conductive layer has a high impedance, resulting in a high production cost and a high price, which affects the market competitiveness and leads to a very low market share of this type of touch screen.

[0004] Therefore, there is an urgent need to develop a technical solution that can solve the Pattern manifestation problem, achieve low impedance, and is more economical, so as to significantly increase the sales of capacitive touch screens and improve the market share of capacitive touch screens. Summary of the Invention

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

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

[0007] A wound metal mesh is formed by winding a conductive wire. The conductive wire includes a high-conductivity alloy wire and an insulating layer wrapped outside it. The surface of the high-conductivity alloy wire has a nano-micro concave-convex structure, and the diameter of the conductive wire is 3-5 μm.

[0008] Further, the wound metal mesh includes a plurality of connected segments and a plurality of S-shaped induction segments. The plurality of S-shaped induction segments are arranged in parallel, and the head end of the latter S-shaped induction segment is connected to the tail end of the previous S-shaped induction segment through one of the connected segments;

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

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

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

[0012] (1) Hybridizing a 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-micro uneven structure on the surface of the wire;

[0014] (3) Winding a high-conductivity alloy wire obtained in the previous step into the shape required for the wound metal mesh;

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

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

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

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

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

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

[0021] Further, 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 reaction kettle at 80 - 90 °C to obtain an acrylic adhesive, the 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, coating the black insulating material on the surface of the wound high-conductivity alloy wire, and curing to form a black insulating layer to obtain the wound metal mesh;

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

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

[0024] The advantages of the present invention include:

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

[0026] 2. A nano-micro uneven structure is formed on the surface of the high-conductivity alloy wire, reducing the high reflectivity of the metal, so that the surface of the high-conductivity alloy wire presents an anti-glare effect. With the wrapped blackening insulating layer, there is no problem of pattern manifestation in the touch screen whether in the scene of direct sunlight or in scenes such as black, white, and gray. Compared with the traditional MM scheme, the user's visual experience is better, the interface sense is uniform, and the anti-glare effect is better;

[0027] 3. The minimum distance between two adjacent S-shaped induction segments can reach 10 μm. Such a narrow pitch of the wire can well improve the touch accuracy;

[0028] 4. The blackening insulating layer is made of a composite material of graphene oxide + adhesive. The graphene oxide has D100 ≤ 10 nm, avoiding the situation of local conduction due to uneven mixing caused by too large particle size of graphene oxide;

[0029] 5. The cost of the touch screen prepared by using the wound metal mesh is lower than that of other touch control schemes, and it has a greater price advantage and is more suitable for the current choice of the frame pasting scheme. Of course, the wound metal mesh of the present invention is also suitable for touch panels produced by other bonding schemes. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 1 is a schematic structural diagram of the wound metal mesh. The upper left figure is a schematic diagram when the S-shaped induction segments are arranged longitudinally, the upper right figure is a schematic diagram when the S-shaped induction segments are arranged horizontally, and the lower figure is a top view schematic diagram of the wound metal mesh layer;

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

[0033] Figure 3 is a schematic structural diagram of the wound metal mesh layer. DETAILED DESCRIPTION OF THE INVENTION

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. Here, the illustrative embodiments of the present invention and the description 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 a conductive wire. The conductive wire includes a high-conductivity alloy wire and an insulating layer wrapped around it. The surface of the high-conductivity alloy wire has a nano-micro uneven structure, and the diameter of the conductive wire is 3-5 μm.

[0037] As Figure 1 As shown in the upper left and upper right figures, the winding metal mesh 1 includes several connected segments 11 and several S-shaped induction segments 12. The several S-shaped induction segments 12 are arranged in parallel, and the head end of the latter S-shaped induction segment 12 is connected to the tail end of the previous S-shaped induction segment 12 through one of the connected segments 11.

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

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

[0040] Embodiment 2

[0041] As Figure 2 As shown, the touch screen prepared by using the winding metal mesh includes, from top to bottom, a cover plate 2, an upper layer optical adhesive 3, a winding metal mesh layer 4, a lower layer optical adhesive 5, and a substrate 6. As Figure 3 As shown, the winding metal mesh layer 4 includes a middle layer optical adhesive 41, and winding metal meshes 1 are provided on both the upper surface and the lower surface of the middle layer optical adhesive 41. As Figure 1 As shown in the following figure, the S-shaped induction segments 12 of the winding metal mesh 1 on the upper surface of the middle layer optical adhesive are arranged longitudinally or horizontally, and the S-shaped induction segments 12 of the winding metal mesh 1 on the lower surface of the middle layer optical adhesive are arranged horizontally or longitudinally. Of course, those skilled in the art can make adaptive changes to the above structure on the premise of the disclosure of this specification, such as setting a border, etc. As Figure 2 As shown, the touch screen can be installed on the surface of the display screen 7 by air bonding, frame bonding, or full bonding to prepare a touch screen.

[0042] Embodiment 3

[0043] The present invention also provides a preparation method for the winding metal mesh, and the steps include:

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

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

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

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

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

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

[0050] The 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 reaction kettle at 80 - 90 °C to obtain an acrylic adhesive. The 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 cured to form a black insulating layer to obtain a wound metal mesh.

[0051] The D100 of graphene oxide ≤ 10 nm.

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

[0053] The technical solutions provided by the embodiments of the present invention have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the embodiments of the present invention. The descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present invention; at the same time, for those of ordinary skill in the art, according to the embodiments of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A winding metal mesh, characterized in that: The winding metal mesh is wound by a conductive wire, the conductive wire includes a high-conductivity alloy wire and an insulating layer wrapped outside it, the surface of the high-conductivity alloy wire has a nano-micro concavo-convex structure, and the diameter of the conductive wire is 3-5 μm; The winding metal mesh includes a plurality of connected segments and a plurality of S-shaped induction segments. The plurality of S-shaped induction segments are arranged in parallel, and the head end of the latter S-shaped induction segment is connected to the tail end of the previous S-shaped induction segment through one of the connected segments; The winding metal mesh is wound by a single conductive wire and is in a planar shape as a whole; The distance between two adjacent S-shaped induction segments is ≥10 μm.

2. A preparation method of the winding metal mesh according to claim 1, characterized in that: The steps include: (1) Hybridizing a 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-micro concavo-convex structure on the surface of the wire; (3) Winding a single high-conductivity alloy wire obtained in the previous step into the shape required for the winding metal mesh; (4) Wrapping an insulating layer around the outer circumference of the high-conductivity alloy wire wound in the previous step to obtain a winding metal mesh.

3. According to the preparation method of a winding metal mesh described in claim 2, characterized in that: The copper alloy contains 90-95 wt% of copper and 2-6 wt% of aluminum; The dosage of nickel is 0.05 equivalent of copper, and the dosage of silver is 0.1 equivalent of copper.

4. According to the preparation method of a winding metal mesh described in claim 2, characterized in that: The process of step (2) includes: stretching the high-conductivity alloy material into a wire, and then etching the wire to form a nano-micro concavo-convex structure on its surface; the etching solution for the etching treatment is an aqueous solution containing 1.5-2 wt% hydrogen peroxide and 1.5-2 wt% sulfuric acid; the etching process is to soak the wire in the etching solution for 50-60 s.

5. According to the preparation method of a winding metal mesh described in claim 2, characterized in that: The process of step (2) is: selecting a nano-scale micro concavo-convex wire drawing die inside, and stretching the high-conductivity alloy material into a wire with a nano-micro concavo-convex structure on its surface.

6. According to the preparation method of a winding metal mesh described in claim 2, characterized in that: The process of step (4) includes: mixing and reacting isooctyl acrylate monomer, UV-resistant agent, and curing agent to obtain an acrylic adhesive; mixing and reacting the acrylic adhesive, graphene oxide, and antioxidant to obtain a black insulating material, coating the black insulating material on the surface of the wound high-conductivity alloy wire, and curing to form a black insulating layer to obtain a winding metal mesh.

7. According to the preparation method of a winding metal mesh described in claim 2, characterized in that: The detailed process of step (4) includes: 20-35 parts of isooctyl acrylate monomer, 0.5-2 parts of UV-resistant agent, and 5-10 parts of curing agent are stirred and reacted in a reaction kettle at 80-90 °C to obtain an acrylic adhesive. The 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 cured to form a black insulating layer, thus obtaining a wound metal mesh; The D100 of the graphene oxide is ≤ 10 nm.

8. An application of the wound metal mesh according to claim 1 in the preparation of a touch screen and a touch panel.

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