Hard explosion-proof composite structure based on 3D large curved glass cover plate

Abstract

The utility model provides a hard explosion-proof composite structure based on a 3D large curved surface glass cover plate. The explosion-proof composite structure comprises a glass substrate layer, and an optical adhesive layer, an injection-molded hard resin explosion-proof layer, a coating-molded AR coating layer, an electroplating-molded wear-resistant oxidation metal hardening layer and an antifouling layer which are sequentially stacked on the upper surface of the glass substrate layer from bottom to top; according to the utility model, the hard resin explosion-proof layer is attached to the glass substrate layer through the optical adhesive layer, so that the problems that the hard resin explosion-proof layer is non-uniform in thickness, the edge is warped and the like are solved; the hard substrate (namely the multilayer structure) is coated with a film to form an AR coating film, so that the problems that a coating layer is loose and is easy to crack and fall off and the like caused by coating the film on the soft base layer are solved; and then the upper surface of the AR coating film is electroplated with wear-resistant oxidation metal to form a hardening layer, so that the problems of low hardness, poor scratch resistance, uneven film thickness and the like of the hardening layer caused by a traditional process are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mobile terminal equipment accessories, and more specifically, to a hard explosion-proof composite structure based on a 3D large-curved glass cover. Background Art

[0002] With the advent of the 4G / 5G era, more and more mobile device brands are using curved glass as cover panels, such as mobile phones. Currently, rigid explosion-proof composite structures based on 3D curved glass cover panels suffer from uneven thickness and warped edges. Furthermore, the coating layer is loose and prone to cracking and falling off, while the hardened layer has low hardness and poor scratch resistance.

[0003] Based on this, there is an urgent need to provide a hard explosion-proof composite structure based on a 3D large curved glass cover to solve the technical problems mentioned above. Utility Model Content

[0004] The technical problem to be solved by the present invention is how to solve the problems of uneven layer thickness, edge warping, low hardness and poor scratch resistance of the hard explosion-proof composite structure based on the 3D large curved glass cover. In response to the above problems, a hard explosion-proof composite structure based on the 3D large curved glass cover is provided.

[0005] The technical solution of the utility model to solve the above technical problems is a hard explosion-proof composite structure based on a 3D large curved glass cover plate, the hard explosion-proof composite structure includes a glass substrate layer and an optical adhesive layer, an injection-molded hard resin explosion-proof layer, a plated AR coating layer, an electroplated wear-resistant oxide metal hardening layer, and an anti-fouling layer stacked in sequence from bottom to top on the upper surface of the glass substrate layer, wherein the thickness of the hard resin explosion-proof layer is 0.3mm-0.4mm, the thickness of the optical adhesive layer is 3μm-4μm, and the thickness of the AR coating layer is 0.4μm-0.5μm.

[0006] The hard resin explosion-proof layer is aligned and attached to the upper surface of the glass substrate layer through the optical adhesive layer, the upper surface of the hard resin explosion-proof layer is electroplated to form the AR coating layer, and the upper surface of the AR coating layer is electroplated to form the hardened layer.

[0007] In one embodiment, the hard resin explosion-proof layer is made of PC material, COC material or PMMA optical plastic.

[0008] In one embodiment, the surface pencil hardness of the hard resin explosion-proof layer is not less than 2H, and the transmittance of the hard resin explosion-proof layer is not less than 90%.

[0009] In one embodiment, the optical adhesive layer is made of OCA optical adhesive or LOCA optical adhesive in a UV curing manner.

[0010] In one embodiment, the AR coating layer includes alternately stacked SiO2 layers and Si3N4 layers.

[0011] In one embodiment, the hardening layer includes alternately stacked Al2O3 layers and ZrO2-plated layers.

[0012] In one embodiment, the anti-fouling layer is an Ar anti-fouling layer, and the thickness of the anti-fouling layer is 20 nm-30 nm.

[0013] The beneficial effects of the present invention are as follows: the hard resin explosion-proof layer is attached to the glass substrate layer through the optical adhesive layer, which not only solves the problems of uneven thickness and edge warping of the hard resin explosion-proof layer, but also further increases the hardness of the multi-layer structure composed of the glass substrate layer, the optical adhesive layer and the hard resin explosion-proof layer; and a film is plated on the aforementioned hard substrate (that is, the aforementioned multi-layer structure) to form an AR coating film, so as to solve the problems of loose coating layer, easy cracking and falling off caused by coating on the soft base layer; then, a wear-resistant oxide metal is electroplated on the upper surface of the AR coating film to form a hardened layer, so as to improve the problems of low hardness, poor scratch resistance and uneven film thickness of the hardened layer caused by traditional processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a cross-sectional view of an explosion-proof laminated structure according to an embodiment of the present invention;

[0015] Figure 2 This utility model Figure 1 Enlarged view of point A in the middle.

[0016] Reference numerals: 1 - hard explosion-proof laminated structure; 10 - glass substrate layer; 11 - hard resin explosion-proof layer; 12 - optical adhesive layer; 13 - AR coating layer; 14 - hardening layer; 15 - anti-fouling layer. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] The utility model provides a rigid explosion-proof composite structure based on a 3D large curved glass cover, which is used on the cover of mobile terminal devices, such as mobile phones, tablet computers, and laptop computers.

[0019] A rigid explosion-proof composite structure based on a 3D large-curved glass cover. Specifically, the rigid explosion-proof composite structure has a transmittance greater than 93%, and a surface pencil hardness of 6H-7H, effectively reducing the impact force of a mobile phone and thus protecting the phone from damage to a certain extent. According to the principle of optical thin film interference, in practical applications, the optical film can be a multilayer structure composed of two or more materials with different refractive indices. The rigid explosion-proof composite structure includes a glass substrate layer 10 and, stacked from bottom to top on the upper surface of the glass substrate layer 10, an optical adhesive layer 12, an injection-molded rigid resin explosion-proof layer 11, a plated AR coating layer 13, an electroplated wear-resistant oxide metal hardening layer 14, and an anti-fouling layer 15. It should be noted that the material of the optical adhesive layer 12 includes OCA optical adhesive material and LOCA optical adhesive material, and the rigid resin explosion-proof layer 11 is an optical-grade rigid resin explosion-proof layer 11 made by injection molding molten materials including PC optical plastic, COC optical plastic, and PMMA optical plastic.

[0020] In addition, the optical-grade hard resin explosion-proof layer 11 made by the injection molding process can be directly adhered to the surface of the glass substrate layer 10 at room temperature, which not only solves the problem of high difficulty in applying film to 3D large curved glass (due to the advantages of the hard explosion-proof composite structure being explosion-proof, high hardness, preventing cracking and falling off, and having good scratch resistance, the mobile terminal device using the hard explosion-proof composite structure as a cover does not need to be post-installed with a film. Based on this, it also solves the problem of high difficulty in applying film to 3D large curved glass. Obviously, the hard explosion-proof composite structure based on a 3D large curved glass cover in the present application belongs to a front-installed film), but also avoids defects such as uneven thickness of the hard resin explosion-proof film layer (or uneven wall thickness of the injection molded part), edge warping (the accumulated stress in the film layer will cause the component to have serious surface distortion after coating. When the stress accumulates to a certain extent or reaches a certain threshold, the film may even fail due to warping, cracking, falling off, and other failure phenomena) and shrinkage.

[0021] It should also be noted that although the optical-grade hard resin explosion-proof layer 11 can be directly bonded to the glass substrate layer 10 at room temperature, the hardness of the hard explosion-proof laminated structure is highly correlated with the material properties of the substrate itself, and in order to achieve coating on a hard substrate (the hard substrate here refers to a multi-layer structure formed by stacking the hard resin explosion-proof layer 11 on the glass substrate layer 10) to solve the problems of poor density, easy cracking and falling off of the coating layer (corresponding to the AR coating layer 14 in this application) on the soft substrate, that is, to increase the hardness of the aforementioned multi-layer structure, the optical-grade hard resin explosion-proof layer 11 is attached to the upper surface of the glass substrate layer 10 by optical adhesive. More specifically, the optical adhesive layer 12 is coated on the surface of the glass substrate by spraying, pouring or immersion, and is formed by UV curing when the optical-grade hard resin explosion-proof layer 11 is aligned and bonded to the glass substrate layer 10 coated with optical adhesive. Obviously, the optical adhesive layer 12 is located between the glass substrate layer 10 and the optical-grade hard resin explosion-proof layer 11 .

[0022] In summary, the hard resin explosion-proof layer 11 is aligned and attached to the upper surface of the glass substrate layer 10 through the optical adhesive layer 12 , the upper surface of the hard resin explosion-proof layer 11 is electroplated to form the AR coating layer 13 , and the upper surface of the AR coating layer 13 is electroplated to form the hardening layer 14 .

[0023] In combination with actual needs, in this specific embodiment, preferably, the thickness of the hard resin explosion-proof layer 11 is 0.3 mm-0.4 mm; the thickness of the optical adhesive layer 12 is 3 μm-4 μm; and the thickness of the AR coating layer 13 is 0.4 μm-0.5 μm.

[0024] In one specific embodiment, the hard resin explosion-proof layer 11 can be made of PC, COC, or PMMA optical plastic, as PMMA optical plastics all have excellent transparency, mechanical properties, chemical stability, and durability, as well as being easy to process. It should be noted that the optical-grade hard resin explosion-proof layer 11 made from the aforementioned materials is free of defects such as internal stress marks and rainbow patterns. Of course, in other embodiments, the hard resin explosion-proof layer 11 can also be made of other materials.

[0025] In a specific embodiment, the surface pencil hardness of the hard resin explosion-proof layer 11 is not less than 2H, and the transmittance of the hard resin explosion-proof layer 11 is not less than 90%, so as to ensure that the hard resin explosion-proof layer 11 has good light transmittance. When the user views pictures and texts through a mobile terminal device with the hard explosion-proof composite structure as a cover, the color effect and appearance HC treatment can be restored in the most realistic way.

[0026] In a specific embodiment, the optical adhesive layer 12 is made of OCA optical adhesive or LOCA optical adhesive in a UV curing manner, so that the hardness of the multi-layer structure mentioned above is further increased by the optical adhesive layer 12 .

[0027] In a specific embodiment, since SiO2 material has a lower refractive index than other commonly used thin film materials, the AR coating layer 13 includes alternating stacks of SiO2 layers and Si3N4 layers. The main function of the AR coating layer 13 (i.e., anti-reflection coating or anti-reflection coating) is to reduce or even eliminate reflected light from the surface of the AR coating layer 13, thereby increasing the light transmittance of the AR coating layer 13. Specifically, since the film layer prepared by sputtering coating technology has good adhesion to the substrate, high density, controllable film thickness, and good repeatability, the AR coating layer 13 can be formed by repeatedly alternating SiO2 and Si3N4 coating using a magnetron sputtering process. Preferably, the number of SiO2 and Si3N4 coating layers is 8-10 layers.

[0028] In a specific embodiment, the hardened layer 14 includes alternately stacked Al2O3 layers and ZrO2-plated layers. Specifically, the hardened layer 14 can be made by repeatedly alternatingly plating Al2O3 and ZrO2 using an electron beam plating process to increase the hardness and friction resistance of the hard explosion-proof composite structure.

[0029] In one specific embodiment, the antifouling layer 15 is an Ar antifouling layer. The industry generally believes that antifouling layers made from fluorine materials using a vacuum evaporation coating process are the only antifouling layers currently capable of meeting customer needs and ensuring long-term durability. Generally, vacuum evaporation coating boasts a faster growth rate than other coating methods, and the film growth rate can be controlled by adjusting the heating power. The thickness of the antifouling layer 15 is 20nm-30nm. Notably, the antifouling layer 15 also exhibits an anti-fingerprint effect, offering strong antifouling capabilities and ease of cleaning.

[0030] Refer to the following Figure 2 , a detailed description is given of the manufacturing method of the rigid explosion-proof laminated structure 1 based on the 3D large curved glass cover.

[0031] First, the glass substrate layer 10 is cleaned by ultrasonic cleaning of the glass substrate layer 10 placed on a stainless steel glass insert, and the water drop angle on the surface of the glass substrate layer 10 is ensured to be less than 20 degrees after cleaning.

[0032] Next, a hard resin explosion-proof layer 11 is formed by injection molding a 3D large-curved contoured hard resin. Using optical-grade hard resin material for 3D contoured injection molding, the hard resin is placed into the injection mold to complete the upper mold in the aforementioned injection molding process. The mold is then closed using an injection molding machine, with a melt temperature of 170°C-230°C, an injection pressure of 80 MPa-110 MPa, and an injection time of 2-4 seconds. After injection molding, the pressure is maintained for 20-30 seconds, with a pressure of 40 MPa-50 MPa. After cooling and mold opening, the hard resin explosion-proof layer 11 is formed.

[0033] Next, the hard resin explosion-proof layer 11 is adhered to the upper surface of the glass substrate layer 10. At least one layer of OCA optical adhesive or LOCA optical adhesive is applied to the upper surface of the glass substrate layer 10 by spraying or curtain coating. It should be noted that before implementing the aforementioned steps, the glass substrate layer 10 is cleaned and electrostatically dusted using a plasma cleaner. The coated glass substrate layer 10 and the hard resin explosion-proof layer 11 are then aligned and bonded together. The optical adhesive between the glass substrate layer 10 and the hard resin explosion-proof layer 11 is then UV-cured to form the aforementioned optical adhesive layer 12.

[0034] Then, the AR coating layer 13 is sputtered. The AR coating layer 13 is formed by repeatedly and alternately coating SiO2 metal and Si3N4 metal on the upper surface of the hard resin explosion-proof layer 11 using a magnetron sputtering process under vacuum conditions.

[0035] After that, the hardening layer 14 is evaporated. The upper surface of the AR coating layer 13 is repeatedly plated with SiO2 metal and ZrO2 metal multiple times in a vacuum state by electron beam evaporation process to form the hardening layer 14.

[0036] Finally, an Ar antifouling layer 15 is evaporated. Fluoride is then deposited on the upper surface of the hardened layer 14 using a vacuum evaporation process to create a glass cover with a rigid, explosion-proof laminated structure. It should be noted that the rigid, explosion-proof composite structure based on the 3D curved glass cover produced using the aforementioned process is stable, exhibits a transmittance exceeding 93%, and has a surface pencil hardness of 6H-7H.

[0037] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A rigid explosion-proof composite structure based on a 3D large curved glass cover, characterized in that: The hard explosion-proof composite structure (1) comprises, from bottom to top, a glass substrate layer (10), an injection-molded hard resin explosion-proof layer (11), an optical adhesive layer (12), a plated AR coating layer (13), an electroplated wear-resistant oxidized metal hardening layer (14), and an anti-fouling layer (15), wherein the hard resin explosion-proof layer (11) has a thickness of 0.3 mm to 0.4 mm, the optical adhesive layer (12) has a thickness of 3 μm to 4 μm, and the AR coating layer (13) has a thickness of 0.4 μm to 0.5 μm. The hard resin explosion-proof layer (11) is aligned and attached to the upper surface of the glass substrate layer (10) through the optical adhesive layer (12), the upper surface of the hard resin explosion-proof layer (11) is electroplated to form the AR coating layer (13), and the upper surface of the AR coating layer (13) is electroplated to form the hardened layer (14).

2. The rigid explosion-proof composite structure according to claim 1, characterized in that: The hard resin explosion-proof layer (11) is made of PC material, COC material or PMMA optical plastic.

3. The rigid explosion-proof composite structure according to claim 1, characterized in that: The surface pencil hardness of the hard resin explosion-proof layer (11) is not less than 2H, and the transmittance of the hard resin explosion-proof layer (11) is not less than 90%.

4. The rigid explosion-proof composite structure according to claim 1, characterized in that: The optical adhesive layer (12) is made of OCA optical adhesive or LOCA optical adhesive in a UV curing manner.

5. The rigid explosion-proof composite structure according to claim 1, characterized in that: The AR coating layer (13) comprises SiO2 layers and Si3N4 layers stacked alternately.

6. The rigid explosion-proof composite structure according to claim 1, characterized in that: The hardening layer (14) comprises an Al2O3 layer and a ZrO2 plated layer stacked alternately.

7. The rigid explosion-proof composite structure according to claim 1, characterized in that: The antifouling layer (15) is an Ar antifouling layer (15), and the thickness of the antifouling layer (15) is 20nm-30nm.

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