Film coating method and automobile glass

Abstract

The invention belongs to the technical field of glass coating, and particularly relates to a coating method and automobile glass. The film coating method comprises the following steps that pretreatment is conducted, specifically, a glass substrate to be coated is prepared, the glass substrate is cleaned, the surface of the glass substrate is provided with a film coating area and a shielding area, and the shielding area is arranged in the circumferential direction of the film coating area; ink is jetted, ink is jetted in the shielding area, a barrier layer is formed, and the barrier layer covers the shielding area; film plating: plating a film plating material on the film plating area, and limiting the film plating material to be deposited on the shielding area by the barrier layer; and stripping: stripping the barrier layer to expose the shielding region. In the film coating process, the mask plate does not need to be manually carried, the problems of low efficiency and potential safety hazards are avoided, finally, the film coating efficiency is improved, and the film coating cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of glass coating, and particularly relates to a coating method and automotive glass. Background Art

[0002] Currently, in the manufacturing process of automotive coated glass (such as Low-E film, heat-insulating film, ultraviolet-ray blocking film, conductive film, etc.), it is usually necessary to shield the edges and signal conduction areas of the glass to avoid coating in this area, which may affect the edge oxidation and degumming of laminated glass and the signal conduction function, etc.

[0003] Traditional methods use a mask plate (such as a glass plate made by water jet drilling) to cover the edges of the glass. However, before coating, it is necessary to manually carry and manually position the mask plate and fix it with tape to prevent misalignment during the transfer process. After coating, it is also necessary to manually remove the mask plate, resulting in low efficiency. Manually carrying the mask plate for masking is time-consuming, and for small-batch production of multiple models and batches, it is necessary to repeatedly prepare multiple mask plates. This mode is difficult to adapt to multi-piece positioning in one cavity and difficult to meet the requirements of automated production. Summary of the Invention

[0004] An object of an embodiment of the present application is to provide a coating method, aiming to solve the problem of how to improve coating efficiency and reduce costs.

[0005] To achieve the above object, the technical solution adopted in the present application is:

[0006] In a first aspect, a coating method is provided, which includes the following steps:

[0007] Pretreatment: Prepare a glass substrate to be coated and clean the glass substrate. The surface of the glass substrate has a coating area and a shielding area, and the shielding area is arranged circumferentially around the coating area;

[0008] Inkjet printing: Jet ink on the shielding area and form a barrier layer, and the barrier layer covers the shielding area;

[0009] Coating: Deposit a coating material on the coating area, and the barrier layer restricts the deposition of the coating material on the shielding area;

[0010] Stripping: Strip the barrier layer to expose the shielding area.

[0011] In some embodiments, the inkjet printing includes the following steps:

[0012] S21: Adopt inkjet printing technology to jet the ink on the shielding area;

[0013] S22: Cure the ink in the shielding area to form the barrier layer.

[0014] In some embodiments, in the step S22, the ink is cured by using microwave curing technology.

[0015] In some embodiments, the ink is cured by using a microwave curing device, and the power range of the microwave curing device is 500W - 1000W, and the curing time range is 30s - 120s.

[0016] In some embodiments, the thickness range of the barrier layer is 5μm - 20μm.

[0017] In some embodiments, in the film coating step, the film coating material is coated on the film coating area by using magnetron sputtering technology.

[0018] In some embodiments, in the film coating step, the film coating material is coated on the film coating area by using chemical vapor deposition technology.

[0019] In some embodiments, the barrier layer is integrally separated from the glass substrate by using a physical peeling method.

[0020] In some embodiments, the pretreatment includes the following steps:

[0021] S11: Cutting, cutting out the glass substrate to be coated on the raw glass substrate;

[0022] S12: Cleaning, cleaning the glass substrate with deionized pure water added with a cleaning solution to remove dust and oil;

[0023] S13: Drying, drying the glass substrate.

[0024] In a second aspect, an automotive glass is provided, which is prepared by the film coating method.

[0025] The beneficial effects of the present application are as follows: By pretreating the glass substrate, then forming a barrier layer with ink in the shielding area by inkjet, then coating the film coating material in the film coating area, and finally peeling the barrier layer from the shielding area, the purpose of accurately coating the film coating area of the glass substrate is achieved. And during the film coating process, there is no need to manually carry the mask plate, avoiding the problems of low efficiency and safety hazards, ultimately improving the film coating efficiency and reducing the film coating cost, and being applicable to the automated continuous production of multiple models, multiple batches, and small batches in one pot and multiple pieces. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or exemplary technical descriptions. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is a schematic flowchart of the coating method provided by the embodiment of the present application;

[0028] Figure 2 Schematic diagram of the glass substrate improved in another embodiment of the present application;

[0029] Figure 3 is Figure 2 schematic diagram of the glass substrate with a barrier layer cured thereon;

[0030] Figure 4 is Figure 3 schematic diagram of the coating area of the glass substrate coated with a coating material;

[0031] Figure 5 is Figure 4 schematic diagram of the barrier layer of the glass substrate being peeled off.

[0032] Among them, the reference numerals in the figure:

[0033] 100, glass substrate; 101, coating area; 102, shielding area; 110, coating line; 103, barrier layer; 104, film layer. Detailed implementation manners

[0034] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the following further details the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present application.

[0035] It should be noted that when a component is referred to as "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to the other component. The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description, rather than indicating or implying 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 construed as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances. The terms "first" and "second" are only for convenience of description, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of technical features. The meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0036] Please refer to Figures 1 to 3 , an embodiment of the present application provides a coating method for coating glass, and the coating method includes the following steps:

[0037] Please refer to Figures 2 to 4 , S1: Pretreatment, prepare the glass substrate 100 to be coated, and clean the glass substrate 100 so that the stains and oil on the glass substrate 100 are removed, providing a clean and clear surface for subsequent operations; the surface of the glass substrate 100 has a coating area 101 and a shielding area 102, and the shielding area 102 is arranged around the circumference of the coating area 101; it can be understood that the coating area 101 is located in the central position area of the glass substrate 100, the shielding area 102 is located in the edge area of the glass substrate 100, and the shielding area 102 can completely surround the coating area 101. The coating area 101 and the shielding area 102 are separated by a coating line 110, that is, the coating line 110 is a closed curve drawn on the surface of the glass substrate 100, the area determined within the coating line 110 is the coating area 101, and the area outside the coating line 110 is the shielding area 102.

[0038] S2: Inkjet, spray ink on the shielding area 102 and form a barrier layer 103, and the barrier layer 103 covers the shielding area 102; it can be understood that the ink is accurately sprayed on the shielding area 102 of the glass substrate 100, and the ink has good fluidity and adhesion, can spread rapidly in the shielding area 102 and form a continuous film layer 104, and finally form the barrier layer 103.

[0039] S3: Coating. A coating material is coated on the coating area 101, and the barrier layer 103 restricts the deposition of the coating material on the shielding area 102. It can be understood that the coating material uniformly covers the coating area 101 and forms a film layer 104. The film layer 104 can be a heat-insulating film layer 104, an anti-ultraviolet film layer 104, an anti-fog film layer 104, or a conductive film layer 104, which is selected according to the actual situation and is not limited here.

[0040] S4: Stripping. The barrier layer 103 is stripped to expose the shielding area 102.

[0041] Please refer to Figures 2 to 4 , in the embodiment of the present application, by pre-treating the glass substrate 100, then forming a barrier layer 103 with ink on the shielding area 102 by inkjet, then coating the coating material on the coating area 101, and finally stripping the barrier layer 103 from the shielding area 102, the purpose of accurately coating the coating area 101 of the glass substrate 100 is achieved. And during the coating process, there is no need to manually carry the mask plate, avoiding the problems of low efficiency and safety hazards, ultimately improving the coating efficiency and reducing the coating cost, and being applicable to the automated continuous production of multiple models, multiple batches, and small batches in one pot and multiple pieces.

[0042] Optionally, the shape of the coating area 101 is defined by the routing shape of the coating line 110. Different shapes of the coating area 101 are defined by different routings of the coating line 110 on the glass substrate, such as circular, oval, rectangular, triangular, or irregular. Please refer to Figure 2 , the middle position above the coating area 101 is recessed inward, thus forming a certain recessed area, and the shielding area 102 is arranged around this middle recessed area. Of course, the recessed area can also be formed below or on the left and right sides of the coating area 101, which is not limited here and can be selected according to the actual situation.

[0043] Optionally, the barrier layer 103 formed by inkjet can accurately cover the shielding area 102, effectively restricting the deposition of the coating material on the shielding area 102, thereby improving the clarity of the coating boundary and the product quality. The stripping step makes the shielding area 102 cleanly exposed, without the need for additional grinding or cleaning, without polluting the environment, simplifying the process flow, and reducing the production cost.

[0044] It can be understood that the material of the coating material is related to the formed film layer 104:

[0045] Heat-insulating film. The coating material can be silver (Ag) or tin oxide (SnO2), and can be deposited by magnetron sputtering to provide high-efficiency heat insulation.

[0046] Conductive film. The coating material can be indium tin oxide (ITO), and can be achieved by magnetron sputtering for heating and defogging.

[0047] Anti-ultraviolet film, the coating material can be titanium dioxide, and it can be deposited by CVD, with both UV protection and self-cleaning functions.

[0048] Protective film, the coating material can be silicon dioxide or silicon nitride, deposited by CVD to enhance durability.

[0049] Please refer to Figures 2 to 4 , in some embodiments, the inkjet printing includes the following steps:

[0050] S21: Using inkjet printing technology, jet the ink onto the masking area 102;

[0051] S22: Cure the ink in the masking area 102 to form the barrier layer 103.

[0052] Optionally, during the inkjet printing process, by precisely controlling parameters such as the moving speed of the print head, the inkjet volume, and the size of the ink droplets, precise printing can be achieved. The printing accuracy can be controlled within ±0.05 mm, which can greatly ensure the accuracy of the masking area 102 and avoid coating the areas that do not need to be coated to the greatest extent. For example, according to the size of the glass substrate 100 and the shape of the masking area 102, adjust the scanning path and speed of the print head to ensure that the ink evenly covers the masking area 102; by optimizing the driving voltage and frequency of the print head, precisely control the size and ejection frequency of the ink droplets, and precisely control the thickness of the barrier layer 103.

[0053] It can be understood that since the barrier layer is cured as a whole and can be torn off from the masking area as a whole, and the printing accuracy can be controlled within ±0.05 mm, the boundary of the coated area is clear, and there will be no traditional edge effect, that is, the mask has a certain thickness and will produce a shadow, resulting in a blurred boundary of the coated area. Subsequently, when stacking another glass substrate with a printing area on the glass substrate in this embodiment, the printing area and the coated area can completely coincide, which not only improves the aesthetics but also the quality. Moreover, when carrying out small-batch production of multiple models and batches, only the inkjet printing path needs to be changed, without the need to prepare multiple masks, reducing costs and improving production efficiency.

[0054] Please refer to Figures 2 to 4 , it can be understood that the inkjet printing technology has high precision and flexibility, can accurately jet ink according to the shape and size of the masking area 102, and has higher precision compared with traditional screen printing or manual masking, effectively avoiding the deposition of the coating material on the masking area 102 and reducing the rejection rate. The curing step ensures that the ink forms a stable and tough barrier layer 103, enhancing its barrier effect during the coating process, and in the subsequent peeling step, the barrier layer 103 can be directly torn off from the masking area 102.

[0055] Please refer to Figures 2 to 4, please refer to Figures 2 to 4 , in some embodiments, in the step S22, the ink is cured by using microwave curing technology.

[0056] Please refer to Figures 2 to 4 , optionally, in the microwave curing technology, microwaves are applied to the ink. Microwaves are a kind of high-frequency electromagnetic waves. When microwaves are applied to the glass printed with ink, the microwaves can penetrate deep into the ink. Polar molecules in the ink molecules (such as organic substances containing polar groups) will vibrate and rotate at high speed along with the frequency of the microwaves under the action of the microwave electric field. This high-frequency vibration and rotation of polar molecules will generate internal frictional heat, enabling the ink molecules to quickly obtain energy and the temperature to rise, thereby achieving rapid curing of the ink and forming the barrier layer 103.

[0057] Please refer to Figures 2 to 4 , in some embodiments, a microwave curing device is used to cure the ink. The power range of the microwave curing device is 500W - 1000W, and the curing time range is 30s - 120s.

[0058] Optionally, the power of the microwave curing device can be 500W, 505W, 550W, 590W, 600W, 608W, 630W, 640W, 700W, 760W, 800W, 887W, 900W, 950W or 1000W, which can be selected according to the actual situation and are not limited here.

[0059] The curing time can be 30s, 32s, 35s, 40s, 47s, 50s, 55s, 59s, 70s, 80s, 90s, 95s, 100s, 101s, 109s, 110s, 118s or 120s, which can be selected according to the actual situation and are not limited here.

[0060] The setting of the power parameter and the curing time ensures the stability and controllability of the curing process. Appropriate microwave power and curing time can enable the ink to form a uniform and dense barrier layer 103 in a short time, avoiding incomplete curing due to insufficient energy or damage to the ink caused by overheating due to excessive energy.

[0061] During the curing process, by using microwave field distribution optimization technology, such as setting microwave reflection structures and absorption materials in the microwave curing device, and then through the temperature monitoring feedback system, the distribution of the microwave field and the temperature on the surface of the glass substrate 100 are precisely controlled to ensure that the glass substrate 100 is cured in a uniform energy field, avoiding inconsistent ink curing effects caused by uneven energy distribution.

[0062] It can be understood that the material of the barrier layer can be a resin material. By curing the barrier layer as a whole, it is convenient to tear off the barrier layer as a whole from the shielding area later. For example, rub the edge of the barrier layer by hand to wrinkle the edge of the barrier layer, then pinch the wrinkled position of the barrier layer with fingers, and then tear off the barrier layer from the shielding area; or use adhesive tape, stick to the edge of the barrier layer, and then manually pull the adhesive tape, which can also achieve tearing off the barrier layer from the shielding area, or use a manipulator, set adhesive tape on the manipulator, move the adhesive tape by the manipulator and adhere to the barrier layer, and the barrier layer can be torn off from the shielding area by the manipulator, thereby avoiding the problem of generating polluting gases by heating and decomposing the ink conventionally.

[0063] Please refer to Figures 2 to 4 , in some embodiments, the thickness range of the barrier layer 103 is 5μm to 20μm. For example, the thickness of the barrier layer 103 can be 5μm, 6μm, 7μm, 8μm, 10μm, 12μm, 13μm, 15μm, 17μm, 19μm, 19.5μm or 20μm. There is no limit here and it can be selected according to the actual situation.

[0064] Optionally, the appropriate thickness of the barrier layer 103 not only effectively prevents the deposition of the coating material during the coating process, but also avoids the problems of difficult peeling or material waste caused by excessive thickness. The thin and uniform barrier layer 103 is realized by inkjet printing technology, which can accurately adapt to the needs of the shielding area 102. Compared with the rough edge of the traditional mask, its boundary clarity is higher, and the demarcation of the coating area 101 is more accurate.

[0065] Please refer to Figures 2 to 4 , in some embodiments, in the coating step, the coating material is coated on the coating area 101 by magnetron sputtering technology.

[0066] Optionally, magnetron sputtering technology controls ion bombardment of the target by electric and magnetic fields, and can achieve efficient deposition and uniform coverage of the coating material. Combined with the barrier layer 103 formed by inkjet, magnetron sputtering technology ensures that the coating material is only deposited on the coating area 101, avoiding contamination of the shielding area 102, thereby improving the coating accuracy.

[0067] Please refer to Figures 2 to 4, Magnetron sputtering is carried out in a vacuum environment. Through the action of an electric field and a magnetic field, inert gas ions such as argon are ionized. The ions bombard the target material, sputtering the target atoms out and depositing them in the coating area 101 to form a film layer 104. Due to the already formed dense ink-based barrier layer 103, the barrier layer 103 can effectively prevent the deposition of the coating material in the shielding area 102, thereby achieving accurate coating of the coating area 101. It can be understood that according to different coating requirements and glass materials, appropriate coating process parameters are selected. For example, in magnetron sputtering coating, parameters such as sputtering power, sputtering time, and gas flow are precisely controlled to ensure the coating quality.

[0068] Please refer to Figures 2 to 4 , In some embodiments, in the coating step, the coating material is coated on the coating area 101 by using chemical vapor deposition technology.

[0069] Optionally, chemical vapor deposition generates a film layer 104 through the reaction of gaseous precursors. The film layer 104 has the advantages of good uniformity and strong coverage. Due to the already formed dense ink-based barrier layer 103, the barrier layer 103 can effectively prevent the deposition of the coating material in the shielding area 102, thereby achieving accurate coating of the coating area 101. It can be understood that according to different coating requirements and glass materials, appropriate coating process parameters are selected. For example, in magnetron sputtering coating, parameters such as sputtering power, sputtering time, and gas flow are precisely controlled to ensure the coating quality.

[0070] Please refer to Figures 2 to 4 , In some embodiments, a physical peeling method is used to separate the entire barrier layer 103 from the glass substrate 100.

[0071] Please refer to Figures 2 to 4 , Optionally, the physical peeling method can be that a worker manually tears the entire barrier layer 103 off from the shielding area 102, or a tool, such as a tool clamp, can be used to clamp the edge of the barrier layer 103, and then the barrier layer 103 is torn off from the glass substrate 100 as a whole by the tool clamp. The shielding area 102 is clean without residue, the operation process is simple and efficient, and the peeling efficiency is improved. Compared with chemical peeling or thermal decomposition, the volatilization of harmful substances is avoided, and environmental protection is improved. In addition, this method is simple to operate, does not damage the surface of the glass substrate 100, does not affect the subsequent processes such as hot bending, thereby improving the process compatibility and production efficiency, and reducing the waste treatment cost.

[0072] Please refer to Figures 2 to 4 , In some embodiments, the pretreatment includes the following steps:

[0073] S11: Cutting: Cutting out the glass substrate 100 to be coated on the original glass substrate 100;

[0074] S12: Cleaning: Clean the glass substrate 100 with deionized pure water added with a cleaning solution to remove dust and oil stains.

[0075] S13: Drying: Dry the glass substrate 100.

[0076] Please refer to Figures 2 to 4 , optionally, cut out a glass substrate 100 with a certain shape on the native glass to ensure that the glass substrate 100 meets the coating requirements; then clean and remove the dust and oil stains on the glass substrate 100 with deionized pure water added with a cleaning solution, and then dry the glass substrate 100 with hot air to avoid moisture interfering with the subsequent inkjet and coating processes. Enhance the adhesion between the ink and the glass substrate 100 to ensure that the ink and the coating material can better adhere to the glass substrate 100 and improve the bonding force between the ink and the coating material and the glass.

[0077] The present invention also provides an automotive glass prepared by the coating method. The specific steps of the coating method refer to the above embodiments. Since all the technical solutions of all the above embodiments are adopted, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0078] Benefiting from the high precision of the inkjet blocking layer 103, the high efficiency of microwave curing, and the optimization of the coating process, the automotive glass has the characteristics of clear coating boundaries and excellent film layer 104 quality. Compared with the glass produced by the traditional method, it has higher production efficiency, lower scrap rate, no residue in the shielding area 102, and does not affect the subsequent processing, meeting the high requirements for functionality and reliability of automotive skylights, windows and other components.

[0079] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A coating method, characterized in that, It includes the following steps: Pretreatment: Prepare the glass substrate to be coated and clean the glass substrate. The surface of the glass substrate has a coating area and a shielding area, and the shielding area is arranged circumferentially around the coating area. Inkjet printing: Jet ink on the shielding area to form a barrier layer, and the barrier layer covers the shielding area. Coating: Deposit the coating material on the coating area, and the barrier layer restricts the deposition of the coating material on the shielding area. Peeling: Peel off the barrier layer to expose the shielding area.

2. The coating method according to claim 1, wherein: The inkjet printing includes the following steps: S21: Use inkjet printing technology to jet the ink on the shielding area. S22: Cure the ink in the shielding area to form the barrier layer.

3. The coating method according to claim 2, wherein: In the step S22, the ink is cured by microwave curing technology.

4. The coating method according to claim 3, characterized in that: Use a microwave curing device to cure the ink. The power range of the microwave curing device is 500W - 1000W, and the curing time range is 30s - 120s.

5. The coating method according to claim 1, wherein: The thickness range of the barrier layer is 5μm - 20μm.

6. The coating method according to any one of claims 1-5, characterized in that: In the coating step, the coating material is deposited on the coating area by magnetron sputtering technology.

7. The coating method according to any one of claims 1-5, characterized in that: In the coating step, the coating material is deposited on the coating area by chemical vapor deposition technology.

8. The coating method according to any one of claims 1-5, characterized in that: Adopt a physical peeling method to separate the whole barrier layer from the glass substrate.

9. The coating method according to any one of claims 1-5, characterized in that: The pretreatment includes the following steps: S11: Cutting: Cut out the glass substrate to be coated from the raw glass substrate. S12: Cleaning: Clean the glass substrate with deionized pure water added with a cleaning solution to remove dust and oil. S13: Drying: Dry the glass substrate.

10. An automotive glass, characterized in that, The automotive glass is prepared by the coating method according to any one of claims 1 - 9.

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