A coated glass and a method for making the same

Abstract

The application provides a coated glass and a preparation method thereof. The coated glass comprises a glass substrate and a coating arranged on the surface of the glass substrate, wherein the edge of the coating has a stepped structure. The application also provides a preparation method of the coated glass, which comprises the following steps: A1, providing a glass substrate, and coating the surface of the glass substrate with a coating to obtain a to-be-processed piece; S2, performing film removal treatment on the film removal area of the to-be-processed piece by using laser etching to obtain the coated glass, and the edge of the coating has a stepped structure. Compared with the existing "cliff" edge structure, the edge of the coating has a stepped structure, which can improve the combination of the coating and the glass substrate, and further improve the wear resistance of the glass substrate. The laser etching treatment of the coating can make the coating have a relatively regular edge, and avoid the occurrence of a jagged structure in the use process.

Description

Technical Field

[0001] This invention relates to a coated glass and its preparation method, belonging to the field of glass technology. Background Technology

[0002] To enable automotive glass to possess one or more of the following functions: blocking infrared rays, blocking ultraviolet rays, water repellency, anti-fogging, and anti-reflection, a coating with specific functions can be formed on the surface of the glass plate by applying a coating. For example, one or more of the following can be used: infrared blocking coating, ultraviolet blocking coating, water repellency coating, anti-fogging coating, and anti-reflection coating.

[0003] When applying various functional coatings to irregular curved glass, the coating thickness uniformity control accuracy is required to ensure the stability of the coating function. Spraying is usually used to achieve this. During the spraying process, the workpiece is placed horizontally and the entire surface of the workpiece is sprayed. Depending on the needs, some specific areas need to be treated to remove the coating, such as by using laser treatment.

[0004] Currently, there are many cases of using lasers to treat coatings. For example, patent CN202011292540.3 discloses a printing composition for laser film removal and a method for manufacturing laminated glass. This printing composition includes inorganic isolating particles, resin additives, pigments, and organic solvents. After film removal, this method involves lamination protection treatment. The film removal boundary is abrupt and perpendicular to the glass. When the coating is thick, the edge damage is severe during abrasion resistance testing, posing a risk of failing to meet requirements.

[0005] If the film removal needs to be done at the edge of the glass or at a location with minimal curvature, a masking fixture is usually required during the spraying process for non-transparent parts. For example, patent CN202121395347.2 discloses a workpiece spraying masking fixture. After masking with the fixture body, it can be connected to the production line via connecting columns and connecting holes, and fixed with a mounting plate, thus enabling flexible spraying of the workpiece and facilitating operation. If the paint viscosity is high and the requirement for edge smoothness is low, this solution can meet certain needs. However, for paints with high surface energy and low viscosity, the liquid will still seep between the masking fixture and the glass during the spraying process, leading to subsequent appearance defects such as poor edge smoothness. Furthermore, this solution cannot be used to complete some complex structures. Summary of the Invention

[0006] To address the technical problem of poor adhesion between the coating and glass, which affects wear resistance, the present invention aims to provide a coated glass and its preparation method. The coating edge of the glass substrate has a stepped structure, which can improve the adhesion between the coating and the glass, thereby improving the wear resistance of the glass substrate.

[0007] To achieve the above objectives, the present invention first provides a coated glass, comprising a glass substrate and a coating disposed on the surface of the glass substrate, wherein the edges of the coating have a stepped structure.

[0008] In the aforementioned coated glass, optionally, the stepped structure includes at least two steps, the sum of the widths of the at least two steps being less than or equal to 300 μm. When the sum of the widths of the at least two steps is greater than 0.3 mm, the boundary line can be observed under strong light.

[0009] In the above-mentioned coated glass, optionally, the width of the step is 1μm-50μm, specifically it can be 1μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, etc.

[0010] In the aforementioned coated glass, optionally, the stepped structure includes 2-20 steps, for example, 2, 4, 6, 10, 12, 14, 16, 18, 20, etc. Preferably, the stepped structure includes 4-10 steps, and the width of each step is 15μm-30μm.

[0011] In the aforementioned coated glass, optionally, the height of each step (or the height difference of the steps) is 1μm-4μm, more preferably 1μm-3μm. When the height of the step is less than 1μm, the uniformity of the step height is required to be very high; when the height of the step exceeds 4μm, especially for coatings on curved glass substrates, gaps are likely to appear at the edges of the coating after a lifting resistance test.

[0012] In the aforementioned coated glass, optionally, the coating thickness is 2μm-40μm, specifically 2μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, etc. Preferably, the coating thickness is 5μm-25μm. When the coating thickness is too low, some functional effects of the coating are not obvious, and the etched edges of the coating do not require a stepped design; when the coating thickness is too high, the number of steps at the coating edge is too large, resulting in a wider boundary line span, making the boundary line more obvious and affecting the appearance of the coating.

[0013] In the aforementioned coated glass, the glass substrate can optionally be flat glass or curved glass. Preferably, when curved glass is used, the curvature of the glass substrate is controlled below 100 mm / m, that is, the glass substrate is curved glass with a curvature of less than 100 mm / m. This is because when using curved glass, local inadequacies in processing can easily occur due to changes in curvature. When the curvature is too large, the thickness difference of each step varies too much during the laser etching process, making it impossible to guarantee a consistent number of steps within the control area.

[0014] In the above-mentioned coated glass, optionally, the coating is a functional coating, more preferably, the functional coating includes one or more of the following: infrared blocking coating, ultraviolet blocking coating, hydrophobic coating, anti-fog coating and anti-reflective coating.

[0015] In the aforementioned coated glass, optionally, the coating is laser-etched to form an edge with a stepped structure.

[0016] Optionally, the coated glass can be used as automotive windows, specifically front and rear windshields, front and rear side windows, corner windows, and sunroofs.

[0017] Optionally, in the aforementioned coated glass, the haze change value of the coated glass before and after the simulated car window lifting experiment is less than or equal to 2%. When the haze change value is greater than 2%, the coating surface will appear blurry when observed with the naked eye, and the product quality does not meet the requirements.

[0018] The present invention also provides a method for preparing the above-mentioned coated glass, wherein the preparation method includes the following steps:

[0019] A1. A glass substrate is provided, and a coating is applied to the surface of the glass substrate to obtain the part to be processed;

[0020] A2. Laser etching is used to remove the coating from the area to be treated to obtain coated glass with a stepped structure at the edge of the coating.

[0021] Optionally, in the above preparation method, step A01, namely, positioning the workpiece to be processed, is included between steps A1 and A2; the positioning accuracy of the workpiece to be processed is controlled within ±1mm.

[0022] In the above preparation method, optionally, the ambient humidity during the etching process is less than or equal to 80% RH; more preferably, it is greater than or equal to 30% RH and less than or equal to 80% RH. When the ambient humidity is too high, a water film is easily formed on the surface of the etched coating, and the laser energy will be absorbed by the water film, affecting the film removal effect.

[0023] In the above preparation method, optionally, the cleanliness of the environment is controlled at a level of 100,000 or higher during the laser etching process. When the cleanliness level is too low, dust particles in the environment will fall onto the surface of the etched coating or into the laser path, resulting in poor uniformity of coating etching and ultimately affecting the film removal effect.

[0024] In the above preparation method, preferably, the ambient temperature is controlled between 0℃ and 40℃ during the laser etching process. When the temperature is too high, it will accelerate the aging of the laser equipment.

[0025] In the above preparation method, the laser light source used for etching can optionally be ultraviolet light, visible light, infrared light, etc. The choice of laser light source is related to the function of the coating. For example, if the coating absorbs ultraviolet light, then ultraviolet light is preferred as the laser energy can be better absorbed by the coating during the etching process, resulting in better energy consumption and effect of the etching process.

[0026] In the above preparation method, optionally, the laser linewidth is controlled between 10μm and 50μm during the laser etching process. The smaller the laser linewidth, the higher the quality factor of the optical resonator of the laser, and the higher the price of the laser; moreover, the larger the laser linewidth, the lower the laser energy and the lower the film removal efficiency.

[0027] In the above preparation method, optionally, in step A1, the thickness uniformity of the coating is within ±1 μm. When the coating thickness uniformity is poor, the thin areas of the coating will be processed to the glass substrate during the film removal process. If the depth of processing on the glass substrate is too large, it will lead to increased haze of the coating, thereby affecting the product performance.

[0028] In the above preparation method, optionally, the haze difference between the area to be de-coated of the workpiece before laser etching and the area to be de-coated of the coated glass after laser etching is less than or equal to 0.5%. A haze difference greater than 0.5% before and after laser etching generally indicates incomplete or excessive etching of the coating, resulting in the glass being etched. In this case, scattered light will appear when observing the bright state through the product from a dark state, making the observation unclear.

[0029] In the above preparation method, optionally, the rate of change of surface roughness between the area to be de-coated of the workpiece before laser etching and the area of ​​the de-coated glass after laser etching is less than or equal to 10%. When the rate of change of roughness before and after laser etching is greater than 10%, if there is a contact object similar to a windshield wiper in the de-coated area, the frictional resistance will increase, and it may even cause the contact object to make abnormal noises or bounce.

[0030] In the above preparation method, preferably, the glass substrate is tempered glass, and the stress change rate of the tempered glass before and after laser etching is less than or equal to 5%. When the stress change rate of the tempered glass surface before and after laser etching is greater than 5%, the tempered glass substrate may spontaneously shatter. When the laser-etched area is located in the middle of the tempered glass surface, the above stress change rate refers to the surface stress change rate of the tempered glass; when the laser-etched area is located at the edge of the tempered glass, the above stress change rate refers to the edge stress change rate of the tempered glass.

[0031] In the above preparation method, optionally, in step A2, after the coating is laser etched, the positional accuracy of the edge of the coating is within ±2mm.

[0032] Compared to the existing "cliff-like" edge structure, the stepped structure of the coating edge provided by this invention can improve the adhesion between the coating and the glass substrate, thereby improving the wear resistance of the glass substrate. For example, the appearance remains unchanged or significantly changed before and after the simulated car window glass lifting test, and the haze change value is less than or equal to 2%.

[0033] The method for preparing coated glass provided by the present invention uses laser etching to remove the coating, which can make the removed area of ​​the coating have a more regular edge and avoid damage during use, such as a serrated structure.

[0034] Existing etching methods all require the coating to be fully sprayed before etching can be performed to obtain the desired shape. The method provided by this invention can achieve etching without the need for full coating spraying to obtain the desired shape. The method provided by this invention can etch unwanted excess coating as needed, including but not limited to etching the area in the middle of the coating that needs to be removed to obtain the required window area, and repairing the irregular parts of the coating edge area by laser etching to obtain a regular edge. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a coated glass structure.

[0036] Figure 2 This is a schematic diagram of the edge of a coated glass.

[0037] Figure 3 for Figure 2 A magnified view of a portion of region A in the middle.

[0038] Figure 4 This is a schematic diagram of the stepped structure at the edge of the coating. Detailed Implementation

[0039] In order to provide a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solution of the present invention will now be described in detail below, but it should not be construed as limiting the scope of implementation of the present invention.

[0040] Terminology definition:

[0041] A stepped structure refers to a structure consisting of two or more steps, with each step gradually increasing in height; it can also be called a stepped structure.

[0042] A step refers to the basic structural unit that makes up a stepped structure.

[0043] The top surface of a step refers to the surface of the step that is parallel (or approximately parallel) to the coating surface.

[0044] The side of a step refers to the surface of the step that is perpendicular (or approximately perpendicular) to the coating surface.

[0045] The starting point of a step refers to the intersection of the top surface of the first step and the side surface of the step above it, such as... Figure 4 Point a in the diagram is shown.

[0046] The inflection point of a step refers to the intersection of the top surface and the side surface of the same step, such as... Figure 4 Point b in the diagram is shown.

[0047] The end point of a step is the intersection of the side of one step and the top surface of the next step; this point is also the starting point of the next step. Figure 4 Point c in the diagram is shown.

[0048] The height of a step refers to the vertical distance between the top surface of one step and the top surface of the adjacent step, or the height of the side of the step, such as... Figure 4 As shown in H; when the top surface of the step is curved, the average height of each point is taken as the height of the step. In practice, an appropriate number of points can be measured and calculated, and the average value can be obtained.

[0049] The width of a step refers to the width of its top surface, such as... Figure 4 As shown by L in the diagram; when the top surface of the step is curved, the width of the step is taken as the horizontal width value, i.e. Figure 4 The horizontal distance from point b to point c.

[0050] The thickness difference of each step refers to the difference in thickness at different positions on the top surface of the same step, that is, the thickness difference of the top surface of the step, which is generally controlled within 1μm.

[0051] The sum of the widths of all the steps refers to the total width of all the steps, also known as the total width of the steps.

[0052] The thickness of the coating refers to the thickness of the area that has not undergone laser etching.

[0053] Coating thickness uniformity refers to the uniformity of thickness in areas that have not undergone laser etching, measured in terms of thickness variation.

[0054] Haze difference refers to the glass in the area where the film is removed by laser treatment during the etching process (e.g., during the etching process). Figure 4 The change in haze value H2 of the uncoated region 104 in the glass relative to the haze value H1 of the glass before etching is also called the haze change value, which is calculated as follows:

[0055] The haze difference is equal to |H2 - H1|.

[0056] The surface roughness variation rate of a glass substrate refers to the glass in the area where the film is removed by laser treatment during the etching process (e.g., the area where the film is removed). Figure 4 The rate of change of the roughness Ra2 of the uncoated region 104 in the glass relative to the roughness Ra1 of the glass before etching is calculated as follows:

[0057] Roughness change rate = [(Ra2-Ra1) / Ra1]×100%.

[0058] The invention will be further described below with reference to the accompanying drawings.

[0059] like Figures 1-4 As shown, the coated glass provided by the present invention includes a glass substrate 10 and a coating 101 disposed on the surface of the glass substrate 10, wherein the edge of the coating 101 has a stepped structure.

[0060] In this embodiment, such as Figure 3 As shown, the stepped structure includes at least two steps, and the sum of the widths of the at least two steps is less than or equal to 0.3 mm. That is, when the sum of the widths of all the steps is greater than 0.3 mm, the boundary line can be observed under strong light.

[0061] It should be noted that, as Figure 3 and Figure 4 As shown, the step has a top surface 102 and a side surface 103. The width of the top surface 102 is the width of the step, and the height of the side surface 103 is the height of the step.

[0062] In this embodiment, the width L of each step is 1μm-50μm, specifically 1μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, etc. Preferably, the width L of each step is 5μm-30μm. More preferably, the width L of each step is 10μm-30μm. Even more preferably, the width L of each step is 15μm-30μm.

[0063] In this embodiment, the stepped structure may include 2 to 20 steps, such as 2, 4, 6, 10, 12, 14, 16, 18, 20, etc.

[0064] In this embodiment, preferably, the stepped structure includes 4-10 steps, and the width L of each step is 15μm-30μm.

[0065] In this embodiment, the height H of each step is 1μm-4μm, more preferably 1μm-3μm. When the height H of the step is less than 1μm, the uniformity of the step height is required to be very high; when the height H of the step exceeds 4μm, especially for the coating 101 on the curved glass substrate 100, gaps are likely to appear at the edges of the coating 101 after the lifting resistance test.

[0066] In this embodiment, the coating 101 is a functional coating. More preferably, the functional coating includes one or a combination of two or more of the following: an infrared blocking coating, an ultraviolet blocking coating, a hydrophobic coating, an anti-fog coating, and an anti-reflective coating.

[0067] In this embodiment, the thickness of the coating 101 is 2μm-40μm, specifically 2μm, 5μm, 10μm, 15μm, 20μm, 25μm, 30μm, 35μm, 40μm, etc. Preferably, the thickness of the coating 101 is 5μm-25μm. When the thickness of the coating 101 is too small, the functional effect of the coating 101 is not obvious, and the edge of the coating 101 does not need to have a stepped design; when the thickness of the coating 101 is too large, the number of steps at the edge of the coating 101 is too many, resulting in a wider boundary line, making the boundary line more obvious, and affecting the appearance of the coating 101.

[0068] In this embodiment, the coating 101 is laser-etched to form an edge with a stepped structure. Laser etching technology is characterized by high speed, no seams, high degree of automation, and high yield.

[0069] In this embodiment, the thickness uniformity of the coating 101 is controlled within ±1 μm. When the thickness uniformity of the coating 101 is poor, the thin areas of the coating 101 will reach the glass substrate 100 during the laser etching process. If the depth of the glass substrate 100 is too large, the haze of the coating 101 will increase, thereby affecting the product performance.

[0070] In this embodiment, the glass substrate 100 can be either flat glass or curved glass. Preferably, when curved glass is used, the curvature of the glass substrate 100 is controlled to be below 100 mm / m, that is, the glass substrate 100 is curved glass with a curvature of less than 100 mm / m. This is because when curved glass is used, local processing deficiencies can easily occur due to changes in curvature. For example, when the curvature is too large, during the laser etching process of the coating 101, there is a problem of excessive thickness variation at different locations for the same step; in addition, it is impossible to have a consistent number of steps at the edge of the coating 101.

[0071] In this embodiment, the haze change of coating 101 before and after the simulated car window glass lifting experiment is less than or equal to 2%. When the haze change of coating 101 is greater than 2%, the surface of coating 101 becomes blurry to the naked eye, and the quality of the product does not meet the requirements.

[0072] In this embodiment, the positional accuracy of the edge of the coating 101 is within ±2mm.

[0073] The method for preparing coated glass provided by the present invention includes the following steps:

[0074] A1. A glass substrate 100 is provided, and a coating 101 is coated on the surface of the glass substrate 100 to obtain a workpiece to be processed;

[0075] The surface of the glass substrate 100 is coated with a coating 101. The present invention can be described by applying the coating to the surface of the glass substrate 100 by methods such as flow coating, spin coating, spray coating, roller coating, meniscus coating, mold coating, and wiping.

[0076] The glass substrate 100 can undergo various processing steps, such as cutting, cleaning, edge grinding, bending after softening at high temperature, quenching or annealing, etc., to make it suitable for use as automotive glass.

[0077] A01. Move the workpiece to be processed to the positioning station for positioning;

[0078] Move the workpiece prepared in step A1 to the positioning station. This can be done using visual positioning followed by a robotic arm to pick up the workpiece and place it at the fixed station; alternatively, the workpiece can be manually or automatically picked up by a robotic arm and then positioned. This positioning can be achieved using servo-electric positioning or manual movement positioning. Combining these positioning methods, the positioning accuracy is controlled within ±1mm.

[0079] A2. Laser etching is used to remove the coating from the area to be treated, so that the edge of the coating 101 forms a stepped structure, thus producing glass with a coating.

[0080] It should be noted that the area to be defilmed on the workpiece is formed into a defilmed area after laser defilm removal.

[0081] In this embodiment, the area to be removed from the coating can be the edge of the coating 101 or other locations on the coating 101. For example, the area where the upper edge of the car door glass enters the water deflector cannot have a coating, and the edge area of ​​the coating needs to be removed; the area on the windshield opposite the radar and / or camera cannot have a coating, and the corresponding area of ​​the coating needs to be removed.

[0082] In this embodiment, such as Figure 3 As shown, the film removal area of ​​coating 101 includes a film-free area 104, which refers to the area of ​​coating 101 that has been completely etched by laser. The edge of coating 101 is the boundary of the film removal area, that is, the boundary line between the film-free area 104 and the area of ​​coating 101 that has not been laser-etched. In some other embodiments, the film removal area may also be located only at the edge of coating 101. For example, when the flatness of the edge of coating 101 coated on the surface of glass substrate 100 is poor, the edge of coating 101 can be treated by laser etching to make the edge of coating 101 have a stepped structure, thereby improving the flatness of the edge of coating 101.

[0083] In this embodiment, the ambient temperature range is 0℃-40℃. This is because excessively high temperatures will accelerate the aging of the laser equipment.

[0084] In this embodiment, the ambient humidity is controlled between 30% RH and 80% RH. This is because if the ambient humidity is too high, a water film is easily formed on the surface of the laser-etched coating, and the laser energy will be absorbed by the water film, affecting the film removal effect.

[0085] In this embodiment, the cleanliness level of the environment is controlled at or above Class 100,000. If the cleanliness level of the environment is too low, dust particles in the environment will fall onto the surface of the coating being laser-etched or into the laser beam path, resulting in poor uniformity of coating etching and ultimately affecting the film removal effect.

[0086] In this embodiment, the laser light source can be ultraviolet light, visible light, infrared light, etc. The choice of laser light source is related to the function of the coating. For example, if the coating absorbs ultraviolet light, then ultraviolet light is preferred as the laser energy can be better absorbed by the coating during the film removal process, resulting in better energy consumption and efficiency in film removal.

[0087] In this embodiment, during the laser etching process, the laser linewidth is controlled between 10μm and 50μm, specifically 10μm, 20μm, 30μm, 40μm, and 50μm. The smaller the laser linewidth, the higher the quality factor of the laser's optical resonator, and the higher the price of the laser; moreover, the larger the laser linewidth, the lower the laser energy and the lower the film removal efficiency.

[0088] In this embodiment, the haze difference between the area to be de-coated on the workpiece before laser etching and the area to be de-coated on the coated glass after laser etching is less than or equal to 0.5%. If the haze difference before and after etching is greater than 0.5%, it is because the coating 101 is not completely etched by laser, or the coating 101 is over-etched, resulting in the glass substrate 100 being etched. When an observer looks at a bright state through the coated glass from a dark state, scattered light will occur, making the observed object unclear.

[0089] In this embodiment, the rate of change in surface roughness between the area to be decoated of the workpiece before laser etching and the area of ​​the decoated glass after laser etching is less than or equal to 10%. When the rate of change in surface roughness before and after laser decopping is greater than 10%, it will increase the friction between the contact object and the decoated area, causing the contact object to make abnormal noises or bounce.

[0090] In this embodiment, the glass substrate is tempered glass, and the stress change rate of the tempered glass before and after laser etching is less than or equal to 5%. When the stress change rate of the tempered glass before and after laser etching is greater than 5%, the tempered glass may spontaneously shatter.

[0091] like Figure 3 and Figure 4 As shown, after laser etching, the positional accuracy of the distance between the uncoated area 104 and the edge of the glass substrate is controlled within ±2mm, and the haze difference of the uncoated area 104 before and after laser etching is less than 0.5%.

[0092] The technical solution of the present invention will be described in detail below through Examples 1-12 and Comparative Examples 1-3.

[0093] Examples 1-12

[0094] These embodiments each provide a coated glass, the preparation steps of which are as follows:

[0095] Step 1: Select the workpiece to be processed, which is a glass substrate with a coating on its surface. A flat glass substrate with dimensions of 150mm × 150mm is selected. The coating thickness is measured using a white light interferometer, and the coating thickness is controlled to be 10μm-11μm. The workpiece has an area where the coating needs to be removed, and this area is located in the middle of the workpiece.

[0096] White light interferometric thickness gauge: Product model TranSpec Micro, supplier is Amber Scientific Instruments (Shanghai) Co., Ltd., manufactured in Germany.

[0097] Step 2: Place the part to be processed at the positioning station for fixed positioning.

[0098] Step 3: Select appropriate process parameters, start the laser equipment, and perform laser etching on the area to be coated to obtain coated glass. The coated glass has a coated area with a length of 150mm and a width of 50mm.

[0099] Step 4: Randomly measure the distance of the decoction area using a steel ruler, and select qualified coated glass with a positional accuracy within ±2mm.

[0100] Step 5: For coated glass that meets the accuracy requirements, use a haze meter to test the haze value of the decoction area. Coated glass with a haze difference of less than 0.5% is considered a qualified product.

[0101] The haze meter is model BYK A4725 and is manufactured by BYK Chemicals in Germany.

[0102] Different laser parameters were used to prepare steps of different numbers, such as 2, 4, 6, and 10, with the step width controlled at 5 μm, 15 μm, and 300 μm. A simulated car window lifting experiment was conducted on the coated glass. After the experiment, the appearance of the coating removal boundary of the coated glass was observed with a 50x magnifying glass, and the haze value after the experiment was measured with a haze meter and recorded in Table 1.

[0103] Simulated car window glass lifting test method: Cut a 100mm long car water-cutting strip, fix the water-cutting strip on a linear abrasion tester and apply a pressure of 5N; the length direction of the coating removal area of ​​the coated glass is parallel to the length direction of the water-cutting strip during the test, and ensure that the water-cutting strip can cover the two boundary lines of the coating removal area during the test; immerse the water-cutting strip in a dust solution and then remove it, and then install it on the linear abrasion tester for the test; replenish the dust solution every 1000 abrasion cycles; a total of 10000 tests.

[0104] Linear abrasion tester: Model CRS / YN-LAT, manufactured by Suzhou Yano Tianxia Instrument Co., Ltd.

[0105] Dust solution: The dust consists of silicon dioxide particles with a particle size of 27μm-31μm and a density of 2.6g / cm³. 3 -2.7g / cm 3 The mass ratio of dust to water is 1:3.

[0106] Table 1: Results of boundary treatment for different functional coatings in Examples 1-12

[0107]

[0108] As can be seen from Table 1:

[0109] Examples 1-3, based on the same number of steps, show that the wider the step, the smaller the change in haze value of the coating before and after the simulated car window lifting experiment. Examples 4-6, 7-9, and 10-12, also based on the same number of steps, show that the wider the step, the smaller the change in haze value of the coating before and after the simulated car window lifting experiment, and the less the edge damage. This indicates that the coating has better adhesion to the glass substrate, and the glass has better wear resistance.

[0110] Examples 1, 4, 7, and 10, based on the same type of step, show that the more steps there are, the smaller the change in the haze value of the coating before and after the simulated car window glass lifting experiment. Examples 2, 5, 8, 11, 3, 6, 9, and 12, both based on the same type of step, show that the more steps there are, the smaller the change in the haze value of the coating before and after the wear resistance test, and the less the edge damage. This indicates that the coating has better adhesion to the glass substrate, and the glass has better wear resistance.

[0111] The experimental results from Examples 1-12 show that the larger the width of the step and the more steps there are, the smaller the change in the haze value of the coating before and after the simulated window lifting experiment, and the smaller the edge damage. Furthermore, the greater the edge damage of the coating, the greater the change in the haze value of the coating before and after the simulated window lifting experiment.

[0112] Comparison of Example 6 with Comparative Examples 1-3

[0113] The number of steps in Comparative Example 1 was 1, the number of steps in Comparative Example 2 was 5 and the step width was 100 μm, and the coating thickness in Comparative Example 3 was 1.2 μm and the number of steps was 1. The laser etching of Comparative Examples 1-3 was carried out in accordance with the preparation method of Examples 1-2.

[0114] A simulated car window lifting experiment was conducted on the laser-etched coated glass. After the experiment, the appearance of the coating removal boundary on the coated glass was observed using a 50x magnifying glass, and the haze value after the experiment was measured using a haze meter and recorded in Table 2.

[0115] Table 2 shows the processing results of Example 6 and Comparative Examples 1-3.

[0116]

[0117] As can be seen from Table 2: The coating of Comparative Example 1 has only one step and the thickness of the step is large, which not only causes the edge of the coating to be severely damaged in a jagged shape after the experiment, but also causes the haze value to change significantly beyond the requirements before and after the experiment; In Comparative Example 2, the sum of the widths of all the steps at the edge of the coating is 0.5 mm, and the boundary line of the film removal area can be observed with the naked eye, which does not meet the requirements; The coating of Comparative Example 3 has only one step, and the edge of the coating is severely damaged in a jagged shape after the experiment.

Claims

1. A coated glass comprising a glass substrate and a coating disposed on a surface of the glass substrate, characterized in that, The edge of the coating has a stepped structure, the stepped structure comprises 4-10 steps, the height of each step is 1-4 μm, and the width of each step is 15-30 μm; the thickness of the coating is 2-40 μm. The coated glass is used as automobile glass, and the haze change value of the coated glass is less than or equal to 2% before and after the simulation of the lifting of the automobile window glass.

2. The coated glass according to claim 1, wherein, The sum of the widths of the 4-10 steps is less than or equal to 300 μm.

3. The coated glass of claim 1, wherein, The glass substrate is a flat glass; or The glass substrate is a curved glass, and the curvature of the glass substrate is less than or equal to 100 mm / m.

4. The coated glass of claim 1, wherein, The coating is one of an infrared ray blocking coating, an ultraviolet ray blocking coating, a hydrophobic coating, an anti-fog coating and an anti-reflective coating, or a combination of two or more thereof.

5. The coated glass of claim 1, wherein, The coating is subjected to laser etching treatment to form an edge with a stepped structure.

6. The method of producing a coated glass according to any one of claims 1 to 5, characterized in that, The preparation method comprises the following steps: A1, providing a glass substrate, and coating a coating on the surface of the glass substrate to obtain a to-be-processed piece; A2, performing film removal treatment on the film removal area of the to-be-processed piece by laser etching to obtain the coated glass, and the edge of the coating has a stepped structure.

7. The method of producing a coated glass according to claim 6, characterized by, Between steps A1 and A2, step A01 is further included: A01, positioning the to-be-processed piece, and the positioning accuracy is controlled to be within ±1 mm.

8. The method of producing a coated glass according to claim 6, characterized by, During the etching treatment, the humidity of the environment is greater than or equal to 30% RH and less than or equal to 80% RH; and / or The temperature of the environment ranges from 0°C to 40°C; and / or The cleanliness of the environment is controlled to be more than 100,000 levels.

9. The method of making a coated glass according to claim 6, wherein, During the laser etching treatment, the laser line width is controlled to be 10-50 μm.

10. The method of making a coated glass according to claim 6, wherein, In step A1, the thickness uniformity of the coating is within ±1 μm.

11. The method of making a coated glass according to claim 6, wherein, The haze difference between the film removal area of the to-be-processed piece before the laser etching treatment and the film removal area of the coated glass after the laser etching treatment is less than or equal to 0.5%.

12. The method of making a coated glass according to claim 6, wherein, The change rate of the surface roughness of the film removal area of the to-be-processed piece before the laser etching treatment and the film removal area of the coated glass after the laser etching treatment is less than or equal to 10%.

13. The method of making a coated glass according to claim 6, wherein, The glass substrate is tempered glass, and the stress change rate of the tempered glass before and after the laser etching treatment is less than or equal to 5%.

14. The method of making a coated glass according to claim 6, wherein, In step A2, after the laser etching treatment of the coating, the position accuracy of the edge of the coating is within ±2 mm.

Images