Anti-reflection glass coating method
By using magnetron sputtering method on the vehicle-mounted glass and combined with the multi-stage temperature adjustment method annealing treatment, the problem of film layer falling off after plating the AR film is solved, and the adhesion and production efficiency of the film layer are improved.
Patent Information
- Application Number
- CN202411494509.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-02-18
AI Technical Summary
After the existing on-board glass is coated with AR film, the film layer falls off due to repulsive stress, and the reworking process is cumbersome, affecting production efficiency.
The glass substrate is AR coated by magnetron sputtering method, and multi-stage temperature adjustment method is used to perform multi-stage heating and cooling during the annealing process, adjust the internal structure and stress state of the film layer to avoid new stresses caused by temperature changes.
The uniformity, adhesion and purity of the AR coating are improved, the problem of film layer fallout is solved, the rework process is simplified, and the production efficiency is improved.
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Figure CN119461881A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of vehicle-mounted glass coating, and in particular to an anti-reflection glass coating method. Background Art
[0002] In the field of using glass as a window, such as car glass cover and display windows, due to the presence of certain reflected light and strong light transmitted from the glass, ordinary glass often produces glare in general environments, causing visual fatigue. In order to overcome glare and reduce visual fatigue, it is necessary to reduce or disperse the light intensity emitted by the display device and reduce the reflected light of the glass itself. According to the theory of thin film optics, the method to reduce the reflected light of glass is to coat a dielectric film (AR film) with a lower refractive index than the glass on the surface of the glass. If a certain porosity is formed on the low refractive index film layer, the refractive index of the film layer will be even lower, and the anti-reflection effect will be better; the simplest way to reduce the glass glare phenomenon is to form a velvet surface on the glass surface to make the light form diffuse reflection / transmission to achieve the purpose of anti-glare.
[0003] However, AR-coated glass cover products often have the film layer fall off. The main reason is that there is a certain repulsive stress between the glass and the AR film layer, which makes the bonding poor and cannot meet the requirements of the friction test. In the production process, once this situation is found in the random inspection, the common measure is to remove the coating and repair. The process includes de-inking, de-plating, polishing, cleaning, tempering, etc. The process is very cumbersome and not conducive to production efficiency. Summary of the invention
[0004] After the existing automotive glass is coated with AR film, the film layer will fall off due to the repulsive stress.
[0005] In view of the above problems, a method for manufacturing anti-reflective glass is proposed. The first glass substrate is AR-coated by a magnetron sputtering method, so that the uniformity, adhesion and purity of the film layer of the AR coating are improved. The multi-stage temperature adjustment method is used to perform multi-stage heating in the annealing process, so that the internal structure and stress state of the film layer of the AR coating are fully adjusted. The multi-stage cooling in the annealing process is used to avoid the generation of new stress due to temperature change, and the problem of film shedding due to the existence of repulsive stress after AR coating on the existing automotive glass is solved.
[0006] An anti-reflection glass coating method, comprising: Step 100, performing a first pretreatment on the glass substrate, making a silk screen according to the silk screen printing pattern, and then using the silk screen to perform ink silk screen printing on the pretreated glass substrate, and after the ink silk screen printing is completed, obtaining a first glass substrate; Step 200, performing a second pretreatment on the first glass substrate, performing AR coating on the first glass substrate by using a magnetron sputtering method, and obtaining a second glass substrate after the AR coating is completed; Step 300 , performing a third pretreatment on the second glass substrate, placing the second glass substrate in an annealing furnace and performing annealing treatment using a multi-stage temperature adjustment method to eliminate the repulsive stress of the AR coating on the second glass substrate to the glass substrate, thereby obtaining a third glass substrate.
[0007] In conjunction with the anti-reflective glass coating method of the present invention, in a first possible implementation manner, step 100 includes: Step 110, testing the adhesion of the glass substrate to determine whether the adhesion reaches a specified value; Step 120: Clean the glass substrate to remove dust and oil impurities on the surface.
[0008] In combination with the first possible implementation manner of the present invention, in a second possible implementation manner, after step 120, step 100 further includes: Step 130, fixing the first pretreated glass substrate on a printing table, and fixing the screen on the glass substrate; Step 140, coating the ink on the screen and performing a scraping process to obtain a screen printing pattern; Step 150 , drying the glass substrate after screen printing to obtain a first glass substrate.
[0009] In combination with the second possible implementation manner of the present invention, in a third possible implementation manner, the 200 includes: Step 210: forming a first coating on the surface of the first glass substrate after the plasma treatment, wherein the material of the first coating is compatible with the AR coating to increase adhesion.
[0010] In combination with the third possible implementation manner of the present invention, in a fourth possible implementation manner, after step 210, step 200 further includes: Step 220, placing the first glass substrate in a vacuum chamber, and pumping the air pressure in the vacuum chamber to a specified vacuum pressure value range; Step 230 , introducing working gas into the vacuum chamber to bombard the target material to generate target material atoms, forming an AR coating on the first glass substrate, and obtaining a second glass substrate.
[0011] In combination with the third possible implementation manner of the present invention, in a sixth possible implementation manner, step 210 includes: Step 211, spraying the first coating on the surface of the first glass substrate; Step 212: drying and curing the sprayed first glass substrate.
[0012] In conjunction with the anti-reflective glass coating method of the present invention, in a seventh possible implementation manner, step 300 includes: Step 310: placing the second glass substrate in a dedicated annealing furnace; Step 320: Fix the second glass substrate at a specified position according to its size and shape to ensure uniform heating.
[0013] In combination with the seventh possible implementation manner of the present invention, in an eighth possible implementation manner, after step 320, step 300 further includes: Step 330: In the first heating stage, the temperature in the annealing furnace is raised to the annealing temperature at a prescribed heating rate; Step 340: In the second temperature rising stage, after reaching the annealing temperature, the current temperature is maintained for a specified time to allow the second glass substrate and the AR coating to be fully heated to adjust the structure and stress state in the AR coating layer.
[0014] In combination with the eighth possible implementation manner of the present invention, in a ninth possible implementation manner, after step 340, step 300 further includes: Step 350: In a first cooling stage, slowly lowering the temperature in the annealing furnace at a first cooling rate; Step 360: In the second cooling stage, the temperature in the annealing furnace is slowly reduced at a second cooling rate and the second glass substrate and the AR coating layer are monitored during the cooling process; Wherein, the second cooling rate is greater than the first cooling rate.
[0015] In combination with the eighth possible implementation manner of the present invention, in a ninth possible implementation manner, after step 360, step 300 further includes: Step 370: After the third glass substrate is completely cooled, the stress of the third glass substrate is detected.
[0016] The anti-reflective glass coating method of the present invention is implemented by using a magnetron sputtering method to perform AR coating on a first glass substrate, thereby improving the uniformity, adhesion and purity of the film layer of the AR coating. By using a multi-stage temperature adjustment method to perform multi-stage heating during the annealing process, the internal structure and stress state of the film layer of the AR coating are fully adjusted. By using multi-stage cooling during the annealing process, new stresses due to temperature changes are avoided, thereby solving the problem of film shedding due to the existence of repulsive stress after AR coating on existing automotive glass. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. 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 creative work.
[0018] Figure 1 A schematic diagram of a specific embodiment of the anti-reflection glass coating method of the present invention; Figure 2 for Figure 1 A schematic diagram of a specific embodiment of step 100 in FIG. Figure 3 for Figure 2 A schematic diagram of a specific embodiment after step 120 in FIG. Figure 4 is a schematic diagram of a specific embodiment of step 210 in the present invention; Figure 5 for Figure 1 A schematic diagram of a specific embodiment of step 200 in FIG. Figure 6 for Figure 1 A schematic diagram of a specific embodiment of step 300 in FIG. Figure 7 for Figure 6 A schematic diagram of a specific embodiment after step 320 in FIG. Figure 8 for Figure 7 A schematic diagram of a specific embodiment after step 340 in FIG. DETAILED DESCRIPTION
[0019] The following will be combined with the accompanying drawings in the invention to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.
[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0021] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.
[0022] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0024] After AR coating, the existing automotive glass will fall off due to the repulsive stress. The reason for the stress of the film layer: Due to the influence of factors such as the temperature, deposition rate, power, purity of the target material, and oxygen content during the coating process, when we observe the film layer after coating at a microscopic level, we will find that the arrangement of the courtyard is actually uneven, there will be defects such as dislocations, and the structure may not be homogeneous (for example, it contains harmful impurities or a small amount of unsaturated oxides due to low oxygen content). These defects will cause internal stress.
[0025] In view of the above problems, a method for manufacturing anti-reflective glass is proposed.
[0026] A method for coating anti-reflective glass, such as Figure 1 , Figure 1 The present invention is a schematic diagram of a specific embodiment of the anti-reflection glass coating method; comprising: Step 100 , perform a first pretreatment on the glass substrate, make a silk screen according to the silk screen printing pattern, and then use the silk screen to perform ink silk screen printing on the pretreated glass substrate. After the ink silk screen printing is completed, a first glass substrate is obtained.
[0027] In this embodiment, ink screen printing is performed on the glass substrate, and ink suitable for the material is selected according to the material of the glass substrate to ensure adhesion.
[0028] In a preferred embodiment, Figure 2 , Figure 2 for Figure 1 A schematic diagram of a specific embodiment of step 100 in FIG. 1 ; step 100 includes: step 110, detecting the adhesion of the glass substrate to determine that the adhesion reaches a specified value; step 120, cleaning the glass substrate to remove dust and oil impurities on the surface.
[0029] In this embodiment, dirt and impurities are removed to prevent them from affecting the adhesion.
[0030] In a preferred embodiment, Figure 3 , Figure 3 for Figure 2 A schematic diagram of a specific embodiment after step 120 in FIG. 1 ; step 100 further includes: step 130, fixing the first pretreated glass substrate on a printing table, and fixing the screen on the glass substrate; step 140, applying ink on the screen, and performing a flattening treatment to obtain a screen-printed pattern; step 150, drying the screen-printed glass substrate to obtain a first glass substrate.
[0031] In this embodiment, the screen is designed according to the pattern to be printed, the size and parameters of the pattern are determined, and then the glass substrate is fixed to ensure its stable position.
[0032] Step 200 , performing a second pretreatment on the first glass substrate, performing AR coating on the first glass substrate by using a magnetron sputtering method, and obtaining a second glass substrate after the AR coating is completed.
[0033] In a preferred embodiment, 200 includes: step 210, forming a first coating on the surface of a first glass substrate, wherein the material of the first coating is compatible with the AR coating to increase adhesion.
[0034] In a preferred embodiment, Figure 4 , Figure 4 Schematic diagram of a specific embodiment of step 210 in the present invention; step 210 includes: step 211, spraying a first coating on the surface of a first glass substrate; step 212, drying and curing the sprayed first glass substrate.
[0035] In this embodiment, in order to increase the bonding strength between the AR film and the first glass substrate, a primer layer may be first applied to the glass surface. The material of the primer layer is usually compatible with the material of the AR film and can enhance the adhesion between the film layer and the glass. The primer layer may be applied by spraying, spin coating or dipping, and then dried and cured.
[0036] In a preferred embodiment, Figure 5 , Figure 5 for Figure 1A schematic diagram of a specific embodiment of step 200 in FIG. 2; after step 220, step 200 further includes: Step 220, placing the first glass substrate in a vacuum chamber, and pumping the air pressure in the vacuum chamber to a specified vacuum pressure value range; Step 230 , introducing working gas into the vacuum chamber to bombard the target material to generate target material atoms, forming an AR coating on the first glass substrate, and obtaining a second glass substrate.
[0037] In this embodiment, the AR coating is performed by magnetron sputtering, specifically, including: Vacuuming: Place the prepared first glass substrate into the vacuum chamber of the magnetron sputtering coating equipment, then start the vacuum pump to pump the air pressure in the chamber to the required vacuum degree, generally between 10⁻³-10⁻ 4 Pa around.
[0038] Sputtering target preparation: According to the design requirements of the AR film, select a suitable target material, such as metal oxides (such as titanium oxide, silicon oxide, etc.) or metal materials (such as titanium, aluminum, etc.). Install the target on the cathode of the magnetron sputtering equipment.
[0039] Introduce working gas: Introduce an appropriate amount of working gas, such as argon, into the vacuum chamber. Argon is ionized to form plasma under the action of a high-voltage electric field. Argon ions bombard the surface of the target material under the acceleration of the electric field, causing the target atoms to sputter out.
[0040] Coating: The sputtered target atoms are deposited on the glass surface to form an AR film. By controlling the sputtering time, power, gas flow and other parameters, the thickness and performance of the film can be precisely controlled. For example, for a multi-layer AR film, different material layers need to be sputtered in sequence to obtain the desired optical properties.
[0041] By using magnetron sputtering for AR coating, the AR film has good uniformity, strong adhesion and high purity, and can realize the preparation of complex film systems. It is very suitable for application scenarios such as automotive glass that require high film quality. For example, by precisely controlling the sputtering parameters, an AR film with specific optical properties can be prepared to improve the transmittance of the glass and reduce the reflectivity.
[0042] Step 300 , performing a third pretreatment on the second glass substrate, placing the second glass substrate in an annealing furnace and performing annealing treatment using a multi-stage temperature adjustment method to eliminate the repulsive stress of the AR coating on the second glass substrate on the glass substrate.
[0043] In a preferred embodiment, Figure 6 , Figure 6 for Figure 1A schematic diagram of a specific embodiment of step 300 in FIG. 300 comprises: step 310, placing the second glass substrate in a dedicated annealing furnace; step 320, fixing the second glass substrate at a specified position according to size and shape to ensure uniform heating.
[0044] Place the second glass substrate coated with AR film in a dedicated annealing device, ensure that the equipment is clean, and fix the second glass substrate in the annealing furnace according to the size, shape and capacity of the second glass substrate to ensure uniform heating.
[0045] In a preferred embodiment, Figure 7 , Figure 7 for Figure 6 300 further includes: step 330, in the first heating stage, raising the temperature in the annealing furnace to the annealing temperature at a prescribed heating rate; step 340, in the second heating stage, after reaching the annealing temperature, maintaining the current temperature for a prescribed time length, so that the second glass substrate and the AR coating are fully heated, so as to adjust the structure and stress state in the AR coating layer.
[0046] The first heating stage is the heating stage, in which the temperature in the annealing furnace is raised to the annealing temperature at an appropriate heating rate. The heating rate should not be too fast, otherwise it may cause new stress inside the second glass substrate or cause adverse effects on the AR film. For the annealing of the AR film on the second glass substrate, the heating rate is generally controlled between a few degrees and more than ten degrees per minute.
[0047] The first heating stage is also the heat preservation and soaking stage. After reaching the annealing temperature, it needs to be maintained for a period of time to allow the second glass substrate and the film layer to be fully heated so that the structure and stress state inside the film layer can be adjusted. The heat preservation time usually ranges from tens of minutes to several hours. After the heat preservation is completed, the soaking stage begins. The purpose of this stage is to keep the second glass substrate and the AR film at the annealing temperature for a period of time to make the temperature distribution inside the film layer more uniform and further eliminate stress. The soaking time is generally about 15-30 minutes.
[0048] By adopting the magnetron sputtering method to AR-coat the first glass substrate, the uniformity, adhesion and purity of the AR-coated film layer are improved. By adopting the multi-stage temperature adjustment method to perform multi-stage heating in the annealing process, the internal structure and stress state of the AR-coated film layer are fully adjusted. By adopting multi-stage cooling in the annealing process, new stresses caused by temperature changes are avoided, and the problem of film shedding caused by the existence of repulsive stress after AR coating on existing automotive glass is solved.
[0049] In a preferred embodiment, Figure 8, Figure 8 for Figure 7 Schematic diagram of a specific embodiment after step 340 in . Step 300 also includes: step 350, in the first cooling stage, slowly reducing the temperature in the annealing furnace at a first cooling rate; step 360, in the second cooling stage, slowly reducing the temperature in the annealing furnace at a second cooling rate and monitoring the second glass substrate and the film layer of the AR coating during the cooling process; wherein the second cooling rate is greater than the first cooling rate.
[0050] In a preferred embodiment, after step 360, step 300 further includes: Step 370: After the third glass substrate is completely cooled, the stress of the third glass substrate is detected.
[0051] The first cooling stage is also called slow cooling stage. After the soaking is completed, the temperature in the annealing furnace begins to be slowly lowered. The purpose of slow cooling is to avoid new stresses in the glass and film layers due to rapid temperature changes during the cooling process. The cooling rate is usually controlled at an average of about 1°C every few minutes, and it should be adjusted according to factors such as the material and thickness of the glass. During the slow cooling process, the state of the glass and film layers should be continuously monitored to ensure the stability of the cooling process.
[0052] The second cooling stage is also called the rapid cooling stage. When the temperature of the glass and film layer drops to a certain level (generally close to room temperature), the cooling speed can be appropriately accelerated to improve production efficiency. However, the rapid cooling speed cannot exceed the threshold to avoid damage to the glass and film layer.
[0053] Annealing stress relief principle: During the annealing process, the temperature rises so that the atoms in the coating layer gain more energy and the atomic diffusion rate accelerates. This diffusion can help adjust the arrangement of atoms in the film layer, making the atomic distribution more uniform and reducing local stress concentration areas. The atoms at defects such as dislocations can be rearranged through diffusion to release internal stress; the temperature rise during the annealing process intensifies the thermal motion of atoms, and a small number of molecules that were not fully oxidized in the film layer will continue to react with oxygen in the air. After full oxidation, a homogeneous structure is obtained and internal stress is released.
[0054] The anti-reflective glass coating method of the present invention performs AR coating on the first glass substrate by adopting a magnetron sputtering method, thereby improving the uniformity, adhesion and purity of the film layer of the AR coating, and adopts a multi-stage temperature adjustment method to perform multi-stage heating in the annealing process, so that the internal structure and stress state of the film layer of the AR coating are fully adjusted, and by adopting multi-stage cooling in the annealing process, new stresses due to temperature changes are avoided, thereby solving the problem of film shedding due to the existence of repulsive stress after AR coating on existing vehicle-mounted glass.
[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A method for coating anti-reflective glass, comprising: Step 100, performing a first pretreatment on the glass substrate, making a silk screen according to the silk screen printing pattern, and then using the silk screen to perform ink silk screen printing on the pretreated glass substrate, and after the ink silk screen printing is completed, obtaining a first glass substrate; Step 200, performing a second pretreatment on the first glass substrate, performing AR coating on the first glass substrate by using a magnetron sputtering method, and obtaining a second glass substrate after the AR coating is completed; Step 300 , performing a third pretreatment on the second glass substrate, placing the second glass substrate in an annealing furnace and performing annealing treatment using a multi-stage temperature adjustment method to eliminate the repulsive stress of the AR coating on the second glass substrate to the glass substrate, thereby obtaining a third glass substrate.
2. The anti-reflection glass coating method according to claim 1, characterized in that: The step 100 comprises: Step 110, testing the adhesion of the glass substrate to determine whether the adhesion reaches a specified value; Step 120: Clean the glass substrate to remove dust and oil impurities on the surface.
3. The anti-reflection glass coating method according to claim 2, characterized in that: After step 120, step 100 further includes: Step 130, fixing the first pretreated glass substrate on a printing table, and fixing the screen on the glass substrate; Step 140, coating the ink on the screen and performing a scraping process to obtain a screen printing pattern; Step 150 , drying the glass substrate after screen printing to obtain a first glass substrate.
4. The anti-reflection glass coating method according to claim 1, characterized in that: The 200 includes: Step 210: forming a first coating on the surface of the first glass substrate after the plasma treatment, wherein the material of the first coating is compatible with the AR coating to increase adhesion.
5. The anti-reflection glass coating method according to claim 4, characterized in that: After step 210, step 200 further includes: Step 220, placing the first glass substrate in a vacuum chamber, and pumping the air pressure in the vacuum chamber to a specified vacuum pressure value range; Step 230 , introducing working gas into the vacuum chamber to bombard the target material to generate target material atoms, forming an AR coating on the first glass substrate, and obtaining a second glass substrate.
6. The anti-reflection glass coating method according to claim 4, characterized in that: The step 210 includes: Step 211, spraying the first coating on the surface of the first glass substrate; Step 212: drying and curing the sprayed first glass substrate.
7. The anti-reflection glass coating method according to claim 1, characterized in that: The step 300 includes: Step 310: placing the second glass substrate in a dedicated annealing furnace; Step 320: Fix the second glass substrate at a specified position according to its size and shape to ensure uniform heating.
8. The anti-reflection glass coating method according to claim 7, characterized in that: After step 320, step 300 further includes: Step 330: In the first heating stage, the temperature in the annealing furnace is raised to the annealing temperature at a prescribed heating rate; Step 340: In the second temperature rising stage, after reaching the annealing temperature, the current temperature is maintained for a specified time to allow the second glass substrate and the AR coating to be fully heated to adjust the structure and stress state in the AR coating layer.
9. The anti-reflection glass coating method according to claim 8, characterized in that: After step 340, step 300 further includes: Step 350: In a first cooling stage, slowly lowering the temperature in the annealing furnace at a first cooling rate; Step 360: In the second cooling stage, the temperature in the annealing furnace is slowly reduced at a second cooling rate and the second glass substrate and the AR coating layer are monitored during the cooling process; Wherein, the second cooling rate is greater than the first cooling rate.
10. The anti-reflection glass coating method according to claim 9, characterized in that: After step 360, step 300 further includes: Step 370: After the third glass substrate is completely cooled, the stress of the third glass substrate is detected.