An anisotropic transparent insulating film and its manufacturing process

Abstract

This invention discloses an anisotropic transparent insulating film and its manufacturing process, relating to the field of optical materials technology. To address the limitations of traditional isotropic transparent insulating films, which restrict their use in certain specialized applications, and the inability of traditional isotropic transparent insulating films to achieve high integration due to their limited performance, this invention provides an anisotropic transparent insulating film comprising a substrate layer, an anisotropic conductive layer, an insulating layer, a functional layer, and a protective layer. The grooves on the surface of the substrate layer provide a template for coating the anisotropic conductive layer, thereby improving its stability and durability. The anisotropic conductive layer, made of oriented metal particles, graphene, or conductive polymers, achieves conductivity in a specific direction. The insulating layer ensures electrical isolation of the entire film material, improving safety and stability. The functional layer is suitable for applications requiring good transparency.

Description

Technical Field

[0001] This invention relates to the field of optical materials technology, and in particular to an anisotropic transparent insulating film and its manufacturing process. Background Technology

[0002] With the rapid development of science and technology, transparent insulating films are being used more and more widely in the fields of electronics, optics, and energy. For example, Chinese Patent Publication No. CN104102091B discloses a composition for forming a transparent insulating film. This invention provides a composition for forming a transparent insulating film capable of forming a transparent insulating film with excellent transparency and high dielectric constant, a transparent insulating film obtained using the composition, and a display device having the transparent insulating film. In the composition for forming the transparent insulating film, one or more elements selected from those that house electrons in the ground state of the 4f or 5d orbitals, oxides, chelates, salts, and alloys are used as filler materials. Preferably, the composition for forming the transparent insulating film contains (A) a filler material, (B1) a compound having a group containing an alicyclic epoxy group, and (C) an acid-generating agent; or a composition containing (A) a filler material and (B2) a resin, wherein the (B2) resin is one or more polymers selected from silicone resins, polyamide-imide, polyimide, polycarbonate, polyether, polysulfide, and monomers having olefinic unsaturated double bonds.

[0003] However, traditional transparent insulating films are often isotropic, meaning they have the same physical and chemical properties in different directions. This characteristic limits the use of transparent insulating films in certain special applications. Furthermore, in highly integrated electronic and optical devices, it is often necessary to integrate multiple functions onto a single material. Traditional isotropic transparent insulating films, due to their singular properties, cannot achieve this high degree of integration. Summary of the Invention

[0004] The purpose of this invention is to provide an anisotropic transparent insulating film and its manufacturing process. The textured grooves on the surface of the substrate layer provide a template for coating the anisotropic conductive layer, thereby improving the stability and durability of the conductive layer. The anisotropic conductive layer made of oriented metal particles, graphene, or conductive polymers can achieve conductivity in a specific direction, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An anisotropic transparent insulating film includes a substrate layer, an anisotropic conductive layer, an insulating layer, a functional layer, and a protective layer. The anisotropic conductive layer is coated on the surface of the substrate layer, the insulating layer is coated on the surface of the anisotropic conductive layer, and the functional layer and the protective layer are sequentially disposed on the surface of the insulating layer.

[0007] Furthermore, the substrate surface is provided with grooves for coating an anisotropic conductive layer, which is made of one or more of the following: oriented metal particles, graphene, and conductive polymers.

[0008] Furthermore, the insulating layer is made of one or more of epoxy resin and polyvinyl butyral resin.

[0009] Furthermore, the functional layer includes an anti-reflective layer, an anti-ultraviolet layer, and an antistatic layer. The antistatic layer is coated on the surface of the insulating layer, and the anti-ultraviolet layer and the anti-reflective layer are sequentially coated on the surface of the antistatic layer. The anti-reflective layer is connected to the protective layer.

[0010] Furthermore, the protective layer includes an anti-fingerprint layer, a hardening layer, and a self-cleaning layer, which are arranged sequentially from bottom to top.

[0011] This invention provides another technical solution: a manufacturing process for anisotropic transparent insulating film, the process comprising the following steps:

[0012] S1: Raw material preparation: Select materials for constructing the substrate layer, anisotropic conductive layer, insulating layer, functional layer and protective layer according to the performance requirements of the membrane. Clean the substrate layer and etch grooves on the surface of the substrate layer as required.

[0013] S2: Conductive layer coating: Prepare one or more mixtures of oriented metal particles, graphene, and conductive polymers, and coat the mixture in the grooves of the substrate layer.

[0014] S3: Curing treatment: Conduct conductivity testing on the coated anisotropic conductive layer, and perform curing treatment on the anisotropic conductive layer that passes the test.

[0015] S4: Insulation layer coating: Select one or more of epoxy resin and polyvinyl butyral resin as the insulation material, coat the insulation material evenly on the cured anisotropic conductive layer, and dry the insulation layer.

[0016] S5: Other layer coating: The materials of the functional layer and the protective layer are coated sequentially on the insulating layer and then cured sequentially;

[0017] S6: Post-processing: The cured transparent film is ground and polished to remove uneven edges and surface defects, resulting in an anisotropic transparent insulating film.

[0018] Furthermore, the conductive layer coating specifically includes:

[0019] Solution preparation: Epoxy resin and polyvinyl butyral resin are used as matrix materials. Modifiers are added to the matrix materials in a ratio of 1:4. Silver-plated resin particles with an average particle size of 20μm are mixed into the matrix materials. At the same time, ethanol and acetone solvents are added and stirred to mix evenly to obtain the prepared solution.

[0020] Film coating: The preparation solution is uniformly coated on the surface of the treated substrate layer. After the preparation solution fills the grooves of the substrate layer, a uniform thin film is formed on its surface.

[0021] Orientation treatment: After coating and forming the film, an electric field is applied to align the silver-plated resin particles in the film along the groove direction, thus achieving anisotropy of the film.

[0022] Furthermore, the coating film formation specifically includes:

[0023] The substrate is placed in a coating equipment, which coats the prepared solution onto the substrate surface at a coating speed of 150-250 mm / s. The temperature parameters of the coating equipment are 10℃-35℃±2℃ and the humidity parameters are 60%-70%.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The grooves on the substrate surface provide a template for coating the anisotropic conductive layer. The groove design not only facilitates the directional alignment of conductive particles but also enhances the adhesion between the conductive layer and the substrate, thereby improving the stability and durability of the conductive layer. This helps ensure that the insulating film maintains its good performance under various environmental conditions. The anisotropic conductive layer, made of oriented metal particles, graphene, or conductive polymers, can achieve conductivity in a specific direction. The insulating layer ensures electrical isolation of the entire membrane material, preventing unintended current flow and improving safety and stability. The functional layers provide the ability to reduce reflection, resist ultraviolet damage, and prevent static electricity accumulation, making the membrane material suitable for various environments and applications. It can maintain high transparency and is suitable for applications requiring good transparency. The protective layer protects the entire membrane material through these layers, extending the membrane material's service life. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the anisotropic transparent insulating film of the present invention;

[0027] Figure 2 This is a cross-sectional view of the functional layers of the present invention;

[0028] Figure 3 This is a cross-sectional view of the protective layer of the present invention;

[0029] Figure 4This is a flowchart illustrating the manufacturing process of the anisotropic transparent insulating film of the present invention.

[0030] In the diagram: 1. Base layer; 2. Anisotropic conductive layer; 3. Insulating layer; 4. Functional layer; 41. Anti-reflective layer; 42. Anti-ultraviolet layer; 43. Antistatic layer; 5. Protective layer; 51. Anti-fingerprint layer; 52. Hardening layer; 53. Self-cleaning layer. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] To address the limitation of traditional isotropic transparent insulating films in certain applications, and the fact that highly integrated electronic and optical devices often require multiple functions to be integrated into a single material, traditional isotropic transparent insulating films, due to their limited properties, cannot achieve this level of integration. (See also...) Figure 1-3 This embodiment provides the following technical solution:

[0033] An anisotropic transparent insulating film includes a substrate layer 1, an anisotropic conductive layer 2, an insulating layer 3, a functional layer 4, and a protective layer 5. The surface of the substrate layer 1 is coated with the anisotropic conductive layer 2, and the surface of the substrate layer 1 is provided with grooves for coating the anisotropic conductive layer 2. The anisotropic conductive layer 2 is made of one or more of oriented metal particles, graphene, and conductive polymers. The surface of the anisotropic conductive layer 2 is coated with the insulating layer 3, which is made of one or more of epoxy resin and polyvinyl butyral resin. The surface of the insulating layer 3 is sequentially provided with the functional layer 4 and the protective layer 5.

[0034] In this embodiment, the grooves on the surface of the substrate layer 1 provide a template for coating the anisotropic conductive layer 2. The groove design not only helps the conductive particles to be oriented, but also enhances the adhesion between the conductive layer and the substrate layer, thereby improving the stability and durability of the conductive layer. This helps ensure that the insulating film maintains its good performance under various environmental conditions. The anisotropic conductive layer 2, made of oriented metal particles, graphene, or conductive polymers, can achieve conductivity in a specific direction. The insulating layer 3 ensures the electrical isolation of the entire membrane material, prevents unintended current flow, and improves safety and stability. The functional layers 4 provide the ability to reduce reflection, resist ultraviolet damage, and prevent static electricity accumulation, making the membrane material suitable for various environments and application requirements. It can maintain high transparency and is suitable for applications requiring good transparency. The protective layer 5 protects the entire membrane material through these layers, extending the service life of the membrane material.

[0035] In this embodiment, the functional layer 4 includes an anti-reflective layer 41, an anti-ultraviolet layer 42, and an antistatic layer 43. The antistatic layer 43 is coated on the surface of the insulating layer 3. The surface of the antistatic layer 43 is sequentially coated with the anti-ultraviolet layer 42 and the anti-reflective layer 41. The anti-reflective layer 41 is connected to the protective layer 5. The anti-reflective layer 41 is made of materials such as PET film, bottom anti-reflective coating, top anti-reflective coating, developable bottom anti-reflective coating, spin-coated Si-containing anti-reflective coating, and carbon coating. It reduces reflection by absorbing light or phase shifting and canceling specific wavelengths. The anti-ultraviolet layer 42 is made of a coating containing titanium dioxide and a polyester material containing carbazole. The antistatic layer 43 includes a block copolymer of terephthalic acid, ethylene glycol, and polyether.

[0036] In this embodiment, the anti-reflection layer 41 reduces reflection by absorbing light or by phase shifting and canceling specific wavelengths, which greatly improves the light transmittance of the transparent insulating film. This allows users to obtain a clearer and brighter visual effect in applications such as display devices or touch screens. The UV-resistant layer 42 effectively absorbs and blocks ultraviolet rays, preventing damage to the film material or underlying electronic components, thereby extending the product's service life. The antistatic layer 43 gives the transparent insulating film good antistatic properties. In dry or static-prone environments, this layer effectively prevents the accumulation of static electricity, avoiding damage to equipment or personnel due to electrostatic discharge, thus meeting the basic requirements of the transparent insulating film.

[0037] In this embodiment, the protective layer 5 includes an anti-fingerprint layer 51, a hardening layer 52, and a self-cleaning layer 53, which are arranged sequentially from bottom to top. The anti-fingerprint layer 51 is formed by an organic resin and a passivation solution of colloidal silica. The hardening layer 52 includes a hardener, a reinforcing agent, and a filler to increase the surface hardness and durability and prevent scratches and wear. The self-cleaning layer 53 is a photocatalytic coating that decomposes organic pollutants and reduces the adhesion of dirt, thereby achieving a self-cleaning function.

[0038] In this embodiment, the anti-fingerprint layer 51 effectively prevents the adhesion of fingerprints and other oily stains. In applications such as touch screens and display devices that require frequent touching, it is crucial to maintain the clarity and aesthetics of the transparent insulating film. The hardening layer 52 significantly increases the hardness and durability of the transparent insulating film surface, making the surface harder and more wear-resistant, effectively preventing scratches and wear, and extending the service life of the transparent insulating film. The self-cleaning layer 53 can decompose organic pollutants and reduce the adhesion of dirt, which can greatly reduce the workload of cleaning and maintenance, while also improving the hygiene and environmental friendliness of the transparent insulating film.

[0039] For a better demonstration of the anisotropic transparent insulating film, please refer to [link / reference]. Figure 4 This invention provides a manufacturing process for anisotropic transparent insulating film, comprising the following steps:

[0040] S1: Raw material preparation: Based on the performance requirements of the membrane, select the materials for constructing the substrate layer 1, anisotropic conductive layer 2, insulating layer 3, functional layer 4 and protective layer 5, and ensure that the quality and purity of all raw materials meet the production requirements. Clean the substrate layer 1 and etch grooves on the surface of the substrate layer 1 as needed for coating the anisotropic conductive layer 2.

[0041] S2: Conductive layer coating: Prepare one or more mixtures of oriented metal particles, graphene and conductive polymers, and use physical or chemical methods, such as ultrasonic dispersion, stirring, etc., to make the conductive particles uniformly dispersed, which helps to form uniform conductive pathways. Coat the mixture in the grooves of the substrate layer 1.

[0042] In this embodiment, the coating of the conductive layer specifically includes:

[0043] Solution preparation: Epoxy resin and polyvinyl butyral resin are used as matrix materials. Modifiers are added to the matrix materials in a ratio of 1:4. Silver-plated resin particles with an average particle size of 20μm are mixed into the matrix materials. At the same time, ethanol and acetone solvents are added and stirred to mix evenly to obtain the prepared solution.

[0044] Film formation by coating: The preparation solution is uniformly coated onto the surface of the treated substrate layer 1. After the preparation solution fills the grooves and textures of the substrate layer 1, a uniform thin film is formed on its surface. Specifically, this includes:

[0045] The substrate 1 is placed in a coating equipment, and the coating equipment coats the prepared solution onto the surface of the substrate 1 at a coating speed of 150-250 mm / s. The temperature parameters of the coating equipment are 10℃-35℃±2℃ and the humidity parameters are 60%-70%.

[0046] Orientation treatment: After coating and forming a film, an electric field is applied to align the silver-plated resin particles in the film along the groove direction to achieve anisotropy of the film. The orientation and degree of anisotropy of the film are controlled by adjusting parameters such as the intensity, direction and time of the external force.

[0047] S3: Curing treatment: Conduct conductivity test on the coated anisotropic conductive layer 2 to ensure that the conductive particles are regularly arranged in the anisotropic conductive layer 2 to form anisotropic conductive path. After the anisotropic conductive layer 2 passes the test, perform curing treatment to enhance the adhesion between the anisotropic conductive layer 2 and the substrate layer 1. The coating process should ensure the uniformity and thickness control of the coating.

[0048] S4: Insulation layer coating: Select one or more of epoxy resin and polyvinyl butyral resin as the insulation material, coat the insulation material evenly on the cured anisotropic conductive layer 2, and dry the insulation layer 3 to ensure complete curing.

[0049] S5: Other layer coating: The materials of functional layer 4 and protective layer 5 are sequentially coated on the insulating layer 3 and then cured sequentially;

[0050] S6: Post-processing: Post-processing the cured transparent film, such as cutting, grinding, polishing, etc., to remove uneven edges and surface defects, and obtain the finished anisotropic transparent insulating film.

[0051] In this embodiment, through orientation processing, the silver-plated resin particles are aligned along the groove direction to form a highly anisotropic conductive path. This not only ensures excellent conductivity but also enables directional current transmission, meeting the control requirements for current flow direction in specific application scenarios. An insulating layer 3 is uniformly coated on the anisotropic conductive layer 2, effectively isolating the conductive layer from the external environment and ensuring the high insulation performance of the insulating layer 3. The curing process enhances the adhesion between the layers, giving the transparent insulating film better durability and stability. Post-processing further improves the product's quality and lifespan. By controlling the process parameters of the conductive layer coating, the product's performance is effectively optimized, meeting the needs of different fields for transparent conductive materials.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An anisotropic transparent insulating film, comprising a substrate layer (1), an anisotropic conductive layer (2), an insulating layer (3), a functional layer (4), and a protective layer (5), characterized in that: An anisotropic conductive layer (2) is coated on the surface of the substrate (1), an insulating layer (3) is coated on the surface of the anisotropic conductive layer (2), and a functional layer (4) and a protective layer (5) are sequentially disposed on the surface of the insulating layer (3). The surface of the substrate (1) is provided with grooves for coating an anisotropic conductive layer (2), which is made of one or more of oriented metal particles, graphene and conductive polymers. The manufacturing process of the anisotropic transparent insulating film includes the following steps: S1: Raw material preparation: According to the performance requirements of the membrane, select the materials for constructing the base layer (1), anisotropic conductive layer (2), insulating layer (3), functional layer (4) and protective layer (5), clean the base layer (1), and etch grooves on the surface of the base layer (1) as required. S2: Conductive layer coating: Prepare a mixture of one or more materials selected from oriented metal particles, graphene and conductive polymer, and coat the mixture in the grooves of the substrate layer (1); S3: Curing treatment: Conduct conductivity test on the coated anisotropic conductive layer (2), and perform curing treatment on the anisotropic conductive layer (2) after passing the test; S4: Insulation layer coating: Select one or more of epoxy resin and polyvinyl butyral resin as insulation material, coat the insulation material evenly on the cured anisotropic conductive layer (2), and dry the insulation layer (3). S5: Other layer coating: The materials of the functional layer (4) and the protective layer (5) are sequentially coated on the insulating layer (3) and then cured sequentially; S6: Post-processing: Grinding and polishing the cured transparent film to remove uneven edges and surface defects, resulting in an anisotropic transparent insulating film. The conductive layer coating specifically includes: Solution preparation: Epoxy resin and polyvinyl butyral resin are used as matrix materials. Modifiers are added to the matrix materials in a ratio of 1:

4. Silver-plated resin particles with an average particle size of 20μm are mixed into the matrix materials. At the same time, ethanol and acetone solvents are added and stirred to mix evenly to obtain the prepared solution. Coating to form a film: The preparation solution is uniformly coated on the surface of the treated substrate (1). After the preparation solution fills the grooves of the substrate (1), a uniform film is formed on its surface. Orientation treatment: After coating and forming the film, an electric field is applied to align the silver-plated resin particles in the film along the groove direction, thus achieving anisotropy of the film. The coating process specifically includes: The substrate (1) is placed in the coating equipment, and the coating equipment coats the prepared solution onto the surface of the substrate (1) at a coating speed of 150-250 mm / s. The temperature parameters of the coating equipment are 10℃-35℃±2℃ and the humidity parameters are 60%-70%.

2. The anisotropic transparent insulating film as described in claim 1, characterized in that: The insulating layer (3) is made of one or more of epoxy resin and polyvinyl butyral resin.

3. The anisotropic transparent insulating film as described in claim 1, characterized in that: The functional layer (4) includes an anti-reflective layer (41), an anti-ultraviolet layer (42), and an antistatic layer (43). The antistatic layer (43) is coated on the surface of the insulating layer (3). The surface of the antistatic layer (43) is coated with the anti-ultraviolet layer (42) and the anti-reflective layer (41) in sequence. The anti-reflective layer (41) is connected to the protective layer (5).

4. The anisotropic transparent insulating film as described in claim 1, characterized in that: The protective layer (5) includes an anti-fingerprint layer (51), a hardening layer (52) and a self-cleaning layer (53), which are arranged sequentially from bottom to top.

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