Protective film of flexible screen and manufacturing method thereof

Abstract

The invention provides a protective film of a flexible screen and a preparation method of the protective film, and aims to provide improved wear resistance, elasticity and adhesion. The protective film is of a multi-layer composite structure and comprises an outer wear-resistant and scratch-resistant layer, a middle elastic base material layer and an inner adhesion layer. The wear-resistant and scratch-resistant layer is made of a nanoscale hardened material and has a microporous structure to enhance the scratch resistance and the antifogging effect; the elastic base material layer is formed by mixing polyurethane and polyvinyl alcohol fibers and provides high elasticity and tear resistance; and the adhesion layer is made of a modified silica gel material and is easy to mount and dismount, so that the limitation of a traditional protective film in the aspects of durability, elasticity and usability is effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of film materials, and in particular to a protective film for a flexible screen and a manufacturing method thereof. Background Art

[0002] The rapid development of flexible screen technology, particularly in smartphones, wearable devices, and other electronic products, has created new requirements and challenges for corresponding protective films. Traditional protective films often face the challenge of existing materials being unable to provide a high degree of elasticity, wear resistance, and long-term durability, especially under frequent bending and external environmental influences.

[0003] Therefore, it is necessary to design a protective film for a flexible screen and a manufacturing method thereof to solve the above technical problems. Summary of the Invention

[0004] The present invention provides a protective film for a flexible screen and a manufacturing method thereof, which are used to solve the technical problems mentioned in the background technology.

[0005] To solve the above problems, the present invention provides the following technical solution: a protective film for a flexible screen, wherein the protective film is composed of a multi-layer composite structure, including: A wear-resistant and scratch-resistant layer, provided on the outer layer, made of a nano-scale hardened material with a pore size of 0.1 to 0.5 microns; The elastic substrate layer is provided in the middle layer and is composed of a mixture of polyurethane material and polyvinyl alcohol fibers having a length of 5 to 10 microns; an adhesive layer, disposed on the inner layer, and made of a modified silica gel material having a thickness of 50 to 100 nanometers; The layers are tightly bonded together by lamination.

[0006] Furthermore, the wear-resistant and scratch-resistant layer and the elastic substrate layer are connected by an epoxy-based adhesive to enhance the structural integrity and durability between the layers.

[0007] Furthermore, the adhesive layer and the elastic substrate layer are combined by physical winding technology, and have the characteristic of being easy to disassemble.

[0008] Furthermore, the polyvinyl alcohol fibers of the elastic substrate layer are distributed in a parallel arrangement mode to evenly disperse stress.

[0009] Furthermore, a European anti-ultraviolet (UV) layer is coated on the surface of the wear-resistant and scratch-resistant layer.

[0010] The present invention also provides a method for manufacturing a flexible screen protective film, comprising the following steps: S1, mixing polyurethane and polyvinyl alcohol fibers using a mechanical mixing technique to prepare an elastic substrate layer; S2, forming a wear-resistant and scratch-resistant layer with a thickness of 0.5 to 1 micron on the intermediate elastic substrate layer by chemical vapor deposition (CVD) technology, and forming a micro porous structure with a pore size of 0.1 to 0.5 micron in the wear-resistant and scratch-resistant layer; S3, using solution dipping and UV curing technology to prepare an adhesion layer with a thickness of 50 to 100 nm using modified silicone material; S4, combining the above layers into a complete multi-layer composite protective film through lamination technology, wherein the outer layer is a wear-resistant and scratch-resistant layer, the middle layer is an elastic base material layer, and the inner layer is an adhesive layer.

[0011] Furthermore, in step S2 , chemical vapor deposition (CVD) technology uses argon as a carrier gas and is performed in a low-oxygen environment to optimize the uniformity of the wear-resistant and scratch-resistant layer and the consistency of the microporous structure.

[0012] Furthermore, in step S4, the layers are tightly bonded by lamination technology controlled at a temperature of 100 to 150° C. and a pressure of 5 to 10 Pa.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention uses a wear-resistant and scratch-resistant layer made of nano-scale hardened material, and the protective film significantly improves its resistance to scratches and wear. The elastic substrate layer is composed of a mixture of polyurethane material and polyvinyl alcohol fiber. This structure not only provides high elasticity, but also enhances tear resistance, allowing the protective film to withstand frequent bending and stretching, which is very suitable for the use scenarios of flexible folding screens, and effectively solves the limitations of traditional protective films in durability, elasticity and ease of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work. Figure 1 2 is a schematic structural diagram of a flexible screen protection film according to an embodiment of the present invention; Figure 2 Flowchart of a method for manufacturing a flexible screen protective film in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The following will be combined with the accompanying 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention. It should be understood that the drawings are provided for reference and illustration only and are not intended to limit the present invention.

[0016] The invention discloses a protective film for a flexible screen, aiming to solve the limitations of traditional protective films in terms of durability, elasticity and ease of use.

[0017] For details, please refer to Figure 1 , the protective film is composed of a multi-layer composite structure, including: The wear-resistant and scratch-resistant layer 100 is provided on the outer layer and is made of a nano-scale hardened material with a pore size of 0.1 to 0.5 microns; this structure makes the outer layer both strong and durable while effectively preventing scratches and wear, while the microporous structure may help maintain transparency and prevent fogging.

[0018] The elastic substrate layer 200 is provided in the middle layer and is composed of a polyurethane material having a length of 5 to 10 microns mixed with polyvinyl alcohol fibers; this material combination provides high elasticity and tear resistance, enabling the protective film to withstand the bending and stretching of the screen while maintaining its integrity and functionality.

[0019] The adhesive layer 300 is arranged in the inner layer and is made of a modified silicone material with a thickness of 50 to 100 nanometers; this material not only ensures that the protective film fits tightly to the screen, but also facilitates user installation and removal, providing convenience and practicality.

[0020] The layers are tightly bonded together by lamination.

[0021] In this embodiment, the wear-resistant and scratch-resistant layer 100 and the elastic substrate layer 200 are connected by an epoxy-based adhesive to enhance the structural integrity and durability between the layers; this bonding method provides additional mechanical strength, ensuring that the layers of the protective film can remain tightly bonded under long-term use and frequent bending.

[0022] In addition, the adhesive layer 300 and the elastic substrate layer 200 are combined by physical winding technology, which has the characteristic of being easy to disassemble; the use of physical winding technology means that the protective film can be easily removed or replaced from the screen without sacrificing the adhesive strength.

[0023] In this embodiment, the polyvinyl alcohol fibers of the elastic substrate layer 200 are arranged in a parallel pattern. The parallel arrangement of the fibers helps to evenly distribute force, improving the stability of the protective film when the screen is bent. This arrangement can reduce stress concentration points, thereby reducing potential damage or tearing.

[0024] In this embodiment, a UV-resistant coating is applied to the surface of the wear-resistant and scratch-resistant layer 100. The presence of the UV-resistant coating significantly improves the environmental adaptability of the protective film, especially when used outdoors. This not only protects the screen from direct damage from UV rays, but also extends the life of the protective film itself, as long-term UV exposure can damage most materials.

[0025] The present invention also discloses a method for manufacturing a flexible screen protective film, specifically, See also Figure 2 , including the following steps: S1, uses mechanical mixing technology to mix polyurethane and polyvinyl alcohol fibers to prepare the elastic substrate layer, ensuring that the two materials are evenly mixed to form an intermediate elastic layer with consistent properties.

[0026] S2, forming a wear-resistant and scratch-resistant layer with a thickness of 0.5 to 1 micron on the intermediate elastic substrate layer by chemical vapor deposition (CVD) technology, and forming a micro porous structure with a pore size of 0.1 to 0.5 micron in the wear-resistant and scratch-resistant layer 100; to ensure the wear resistance and air permeability of the final protective film.

[0027] S3, using solution dipping and UV curing technology to prepare an adhesive layer with a thickness of 50 to 100 nanometers, using modified silicone material to ensure it has good adhesion and durability.

[0028] S4, combining the above layers into a complete multi-layer composite protective film through lamination technology, wherein the outer layer is a wear-resistant and scratch-resistant layer, the middle layer is an elastic base material layer, and the inner layer is an adhesive layer.

[0029] In this embodiment, in step S2, chemical vapor deposition (CVD) technology uses argon as a carrier gas and is performed in a low-oxygen environment to optimize the uniformity of the wear-resistant and scratch-resistant layer and the consistency of the microporous structure. Using argon as a carrier gas can improve the stability and efficiency of the CVD process. Argon is an inert gas that reduces unnecessary chemical reactions, thereby helping to form a purer and more uniform wear-resistant and scratch-resistant layer. In addition, performing CVD in a low-oxygen environment helps prevent oxidation reactions, further improving the quality of the layer.

[0030] Furthermore, in step S4, the layers are tightly bonded by controlling the lamination technology at a temperature of 100 to 150° C. and a pressure of 5 to 10 Pa. By precisely controlling the temperature and pressure during the lamination process, tight and uniform bonding between different layers can be ensured.

[0031] The flexible screen protective film of the present invention has significantly improved resistance to scratches and abrasion due to the use of a wear-resistant and scratch-resistant layer 100 made of nano-scale hardened material with a pore size of 0.1 to 0.5 microns; the elastic substrate layer 200 is composed of a mixture of polyurethane material and polyvinyl alcohol fiber. This structure not only provides high elasticity, but also enhances tear resistance, allowing the protective film to withstand frequent bending and stretching; the adhesive layer 300 is made of a modified silicone material with a thickness of 50 to 100 nanometers. This material not only provides good adhesion, but also ensures the easy installation and removal characteristics of the protective film, so that users can conveniently replace the protective film; the multi-layer structure is tightly combined through lamination technology. This method ensures the uniformity between different layers and the stability of the overall structure, thereby improving the overall durability and service life of the protective film; it effectively solves the limitations of traditional protective films in durability, elasticity and ease of use, thereby better meeting the needs of modern flexible screens.

[0032] In the description and claims of this application, the words "include / comprise" and the words "have / include" and their variations are used to specify the existence of stated features, values, steps or components, but do not exclude the existence or addition of one or more other features, values, steps, components or their combinations.

[0033] Some features of the present invention are described in separate embodiments for clarity of explanation, however, these features may also be described in combination in a single embodiment. Conversely, some features of the present invention are described in a single embodiment for brevity, however, these features may also be described in different embodiments individually or in any suitable combination.

[0034] 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 and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A protective film for a flexible screen, characterized in that: The protective film is composed of a multi-layer composite structure, including: A wear-resistant and scratch-resistant layer, provided on the outer layer, made of a nano-scale hardened material with a pore size of 0.1 to 0.5 microns; The elastic substrate layer is provided in the middle layer and is composed of a mixture of polyurethane material and polyvinyl alcohol fibers having a length of 5 to 10 microns; an adhesive layer, disposed on the inner layer, and made of a modified silica gel material having a thickness of 50 to 100 nanometers; The layers are tightly bonded together by lamination.

2. The protective film for the flexible screen according to claim 1, characterized in that: The wear-resistant and scratch-resistant layer and the elastic substrate layer are connected by an epoxy-based adhesive to enhance the structural integrity and durability between the layers.

3. The protective film for a flexible screen according to claim 1 or 2, characterized in that: The adhesive layer and the elastic base material layer are combined by physical winding technology and have the characteristic of being easy to disassemble.

4. The protective film for a flexible screen according to claim 1, characterized in that: The polyvinyl alcohol fibers of the elastic substrate layer are distributed in a parallel arrangement mode to evenly disperse stress.

5. The protective film for a flexible screen according to claim 1, characterized in that: A European anti-ultraviolet (UV) layer is coated on the surface of the wear-resistant and scratch-resistant layer.

6. A method for manufacturing a flexible screen protective film, characterized in that: The following steps are involved: S1, mixing polyurethane and polyvinyl alcohol fibers using a mechanical mixing technique to prepare an elastic substrate layer; S2, forming a wear-resistant and scratch-resistant layer with a thickness of 0.5 to 1 micron on the intermediate elastic substrate layer by chemical vapor deposition (CVD) technology, and forming a micro porous structure with a pore size of 0.1 to 0.5 micron in the wear-resistant and scratch-resistant layer; S3, using solution dipping and UV curing technology to prepare an adhesion layer with a thickness of 50 to 100 nm using modified silicone material; S4, combining the above three-layer structure into a complete multi-layer composite protective film through lamination technology, wherein the outer layer is a wear-resistant and scratch-resistant layer, the middle layer is an elastic base material layer, and the inner layer is an adhesive layer.

7. The method for manufacturing a flexible screen protective film according to claim 6, wherein: In step S2 , chemical vapor deposition (CVD) technology uses argon as a carrier gas and is performed in a low-oxygen environment to optimize the uniformity of the wear-resistant and scratch-resistant layer and the consistency of the microporous structure.

8. The method for manufacturing a flexible screen protective film according to claim 6, wherein: In step S4, the layers are tightly bonded by lamination technology controlled at a temperature of 100 to 150° C. and a pressure of 5 to 10 Pa.

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