Protective coating film for glass thermoplastic processing and preparation method thereof

Abstract

The invention discloses a protective coating film for glass thermoplastic processing and a preparation method thereof, and relates to the technical field of glass thermoplastic processing. The protective coating sequentially comprises an easy-to-retreat layer, a base layer, a high-temperature-resistant layer and a protective layer from bottom to top, the easy-to-retreat layer is a molybdenum plating layer or a molybdenum-platinum alloy plating layer; the base layer comprises the following components in percentage by mass: 1-25% of Ti, 1-30% of Al, 1-30% of Si and 1-20% of N; the high-temperature-resistant layer comprises the following components in percentage by mass: 1 to 25 percent of Ti, 1 to 30 percent of Si, 1 to 20 percent of N, 1 to 50 percent of O and 0 to 30 percent of Al; the protective layer comprises the following components in percentage by mass: 1 to 25 percent of Ti, 1 to 30 percent of Si, 1 to 20 percent of N, 1 to 50 percent of O, 1 to 10 percent of C and 0 to 30 percent of Al. The protective coating film provided by the invention can be used for thermoplastic processing of flexible glass, does not react with the glass and does not diffuse in a range from normal temperature to 1000 DEG C, and ensures the smooth finish and light transmission of a deplated glass cover plate while improving the processing complexity and yield of the flexible glass, thereby greatly reducing the manufacturing cost of the flexible glass.

Description

Technical Field

[0001] This invention relates to the field of glass thermoplastic processing technology, and in particular to a protective coating for glass thermoplastic processing and its preparation method. Background Technology

[0002] Ultra-thin glass (UTG) requires ultra-thin glass properties such as wear resistance, high light transmittance, high strength, bendability, and good resilience due to its long-term or folding use. A balance between flexibility, strength, and light transmittance is particularly crucial. Currently, two main methods are used: one-step forming and two-step forming (thinning). One-step forming involves directly producing an ultra-thin sheet of approximately 30μm through a down-drawing process. This sheet is then further processed through cutting, grinding, strengthening, and coating to create the UTG cover. The production technology for ultra-thin sheets using the one-step forming method has high barriers to entry and is mastered by a few foreign companies such as Schott and Corning.

[0003] The secondary forming (thinning) method involves using chemical techniques to thin a relatively thick glass sheet to a specific thickness of about 30μm before proceeding with the UTG cover plate process. For example, the chemical etching thinning process utilizes the principle of dissolving the silica on the surface of the glass substrate by chemically reacting with a hydrofluoric acid chemical solution (HF) to etch the panel and reduce the glass thickness. The main processes include immersion thinning, single-piece horizontal spraying, single-piece vertical spraying, and waterfall flow. Each of these four chemical etching thinning methods has its own advantages and disadvantages and is used in actual production.

[0004] Currently, the secondary forming method is the main method adopted by domestic enterprises. It involves processes such as chemical etching for thinning and usually adopts four processes: "original sheet → thinning → processing → bonding". Among them, the processing process involves heating the thinned glass from room temperature to about 800°C for thermoplastic deformation and then cooling it down. The oxidation, scratches and contamination of the glass surface caused during the thermoplastic processing are one of the main reasons for the low yield and high cost of flexible cover glass.

[0005] Conventional glass manufacturing processes address this issue by adding an electroplated protective layer to the glass surface, resolving surface oxidation, scratches, and contamination problems. For example, CN119612977A discloses a composite coated glass, a method for preparing a composite coating for glass, and equipment, which sequentially coats the surface of the glass to be coated with a molybdenum film and an aluminum film, reducing the impact of excessive operations on substrate quality and avoiding unnecessary quality losses. CN102896824A discloses a coated part and its preparation method, which includes a substrate, several molybdenum layers and several titanium aluminum nitride layers formed on the surface of the substrate, with the molybdenum layers and titanium aluminum nitride layers arranged alternately. The molybdenum layer is directly bonded to the substrate, and the outermost layer is the titanium aluminum nitride layer. The multi-layered coating exhibits high hardness, good corrosion resistance, and high-temperature resistance, thereby effectively improving the service life of the coated part.

[0006] In theory, flexible cover glass could be manufactured by first applying a coating, then performing thermoplastic processing, and finally removing the coating. This would solve the problems of surface oxidation, scratches, and contamination caused by thermoplastic processing. However, conventional coatings lack sufficient ductility, and the thermal expansion coefficients of the coating and glass do not match. This can lead to increased surface roughness or cracking during thermoplastic bending. Furthermore, different coatings require matching stripping solutions to ensure effective stripping. The high temperatures during thermoplastic processing can cause reactions between the coating and the glass, generating intermediate compounds. Incomplete stripping with conventional solutions can result in poor light transmittance of the final flexible cover glass (e.g., residue, discoloration, or cloudiness). Therefore, it is necessary to develop a process suitable for flexible cover glass: coating a protective film → thermoplastic processing → stripping, to improve the production yield of flexible cover glass. Summary of the Invention

[0007] This invention employs a four-step process: "semi-finished raw sheet → protective film coating → processing → stripping," solving the aforementioned technical problems. The developed and prepared protective coating can improve the overall process yield by over 60%. This invention utilizes a PVD vacuum sputtering coating process with inorganic oxide materials. The process film comprises four gradient-stacked layers, including, but not limited to, an easy-to-remove layer, an underlayer, a high-temperature resistant layer, and a protective layer. These layers possess characteristics such as superior adhesion, pyrolysis resistance, super-slip properties, wear resistance, and easy stripping. Compared to traditional flexible glass processes, the product process is more stable, has better repeatability, and offers higher cost-effectiveness for large-scale production.

[0008] The objective of this invention is achieved through the following technical solutions.

[0009] A protective coating for thermoplastic processing of glass is provided, comprising, from bottom to top, an easy-to-remove layer, a base coat, a high-temperature resistant layer, and a protective layer;

[0010] The easily removable layer is a molybdenum coating or a molybdenum-platinum alloy coating, wherein the molybdenum content in the molybdenum-platinum alloy coating is not less than 98% by mass.

[0011] The underlayer comprises the following components by mass: 1-25% Ti, 1-30% Al, 1-30% Si, and 1-20% N;

[0012] The high-temperature resistant layer comprises the following components by mass: 1-25% Ti, 1-30% Si, 1-20% N, 1-50% O, and 0-30% Al;

[0013] The protective layer comprises the following components in terms of mass content: 1-25% Ti, 1-30% Si, 1-20% N, 1-50% O, 1-10% C, and 0-30% Al.

[0014] Preferably, the thickness of the easily degradable layer is 3nm-30μm.

[0015] Preferably, the thickness of the substrate is 1-100 nm.

[0016] Preferably, the thickness of the high-temperature resistant layer is 1-100 nm.

[0017] Preferably, the thickness of the protective layer is 1-100 nm.

[0018] Preferably, the underlayer comprises the following components by mass content: 20-25% Ti, 25-30% Al, 25-30% Si, and 15-20% N; the high-temperature resistant layer comprises the following components by mass content: 20-25% Ti, 25-30% Si, 15-20% N, 20-30% O, and 0-10% Al; the protective layer comprises the following components by mass content: 15-25% Ti, 25-30% Si, 15-20% N, 10-20% O, 1-10% C, and 0-10% Al.

[0019] Alternatively, the underlayer may also include 0-30% Mo and 0-30% Cr; the high-temperature resistant layer may also include 0-30% Mo and 0-30% Cr; and the protective layer may also include 0-30% Mo and 0-30% Cr.

[0020] The above-mentioned method for preparing a protective coating for thermoplastic processing of glass includes the following steps:

[0021] S1: An easily removable layer is electroplated onto a glass substrate;

[0022] S2: Electroplating the underlayer onto the easily removable layer;

[0023] S3: Electroplat a high-temperature resistant layer onto the base layer;

[0024] S4: Electroplating a protective layer on the high-temperature resistant layer.

[0025] Preferably, the electroplating of the easily removable layer on the glass substrate specifically involves depositing a molybdenum coating or a molybdenum-platinum alloy coating on the glass substrate under a vacuum of 0.1-10 Pa and an argon atmosphere. The thickness of the glass substrate can be selected from 10 μm to 5 mm.

[0026] Preferably, the electroplating of the underlayer on the easily degradable layer specifically involves using a titanium-aluminum-silicon target or a titanium-aluminum-silicon-nitrogen target, under a vacuum of 0.1-10 Pa, and in an argon and nitrogen atmosphere, to deposit the underlayer on the easily degradable layer. More preferably, the nitrogen gas accounts for 0.1-50% of the total gas volume, with the balance being argon.

[0027] Preferably, the electroplating of the high-temperature resistant layer on the underlayer specifically involves using a titanium-silicon target or a titanium-aluminum-silicon target, under a vacuum of 0.1-10 Pa, in an environment of argon, nitrogen, and oxygen, to deposit the high-temperature resistant layer on the easily removable layer. More preferably, the nitrogen gas accounts for 0.1-50% of the total gas volume, the oxygen gas accounts for 0.1-50% of the total gas volume, and the balance is argon.

[0028] Preferably, the electroplating of the protective layer on the high-temperature resistant layer specifically involves depositing the high-temperature resistant layer on the easily degradable layer using a titanium-silicon target or a titanium-aluminum-silicon target, under a vacuum of 0.1-10 Pa, in an environment containing argon, nitrogen, oxygen, and acetylene. More preferably, the nitrogen gas accounts for 0.1-40% of the total gas volume, the oxygen gas accounts for 0.1-40% of the total gas volume, the acetylene gas accounts for 0.1-20% of the total gas volume, and the balance is argon.

[0029] The protective coating for thermoplastic processing of glass of the present invention can be removed by the following stripping agent, which is composed of the following components in mass content: 20-30% oxidant, 0.5-3% inorganic acid, 1-10% organic acid, 5-10% honey, and the balance being water.

[0030] Preferably, the oxidant is selected from at least one of potassium permanganate and hydrogen peroxide; the inorganic acid is selected from at least one of hydrochloric acid and sulfuric acid; and the organic acid is selected from at least one of citric acid and oxalic acid.

[0031] More preferably, the film-removing agent consists of the following components in the indicated mass percentages: 10-20% potassium permanganate, 10-20% hydrogen peroxide, 0.5-3% hydrochloric acid, 1-10% citric acid, 1-5% honey, with the balance being water.

[0032] The protective coating for thermoplastic processing of glass of the present invention combines materials science and plasma electroplating technology. It can be used for thermoplastic processing of flexible glass. The protective coating does not react with or diffuse with the glass in the range of room temperature to 1000°C. While improving the processing complexity and yield of flexible glass, it also ensures the smoothness and light transmittance of the glass cover after the coating is removed. At the same time, it eliminates the influence of electrical properties such as insulation, thereby significantly reducing the manufacturing cost of flexible glass and obtaining a more cost-effective flexible cover glass for mobile phones. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 Images of the flexible cover glass sheet of Example 1 after electroplating protective coating, thermoplastic processing, and coating removal.

[0035] Figure 2 Images of the flexible cover glass sheet of Example 2 after electroplating protective coating, thermoplastic processing, and coating removal.

[0036] Figure 3 Images of the flexible cover glass sheet of Example 3 after electroplating protective coating, thermoplastic processing, and coating removal.

[0037] Figure 4 The image shows the flexible cover glass sheet of Comparative Example 1 after electroplating with a protective coating and thermoplastic processing.

[0038] Figure 5 The image shows the flexible cover glass sheet of Comparative Example 2 after electroplating with a protective coating and thermoplastic processing.

[0039] Figure 6 The image shows the flexible cover glass sheet of Comparative Example 4 after electroplating with a protective coating and thermoplastic processing.

[0040] Figure 7 The image shows the flexible cover glass sheet of Comparative Example 9 after electroplating with a protective coating and thermoplastic processing.

[0041] Figure 8 The image shows the flexible cover glass sheet of Comparative Example 13 after electroplating a protective coating and thermoplastic processing.

[0042] Figure 9 The image shows the flexible cover glass sheet of Comparative Example 20 after electroplating with a protective coating and thermoplastic processing. Detailed Implementation

[0043] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0045] In the following embodiments, the method for preparing a protective coating for thermoplastic glass processing is as follows:

[0046] S1: An easily removable layer is electroplated onto the flexible cover glass sheet;

[0047] S2: Electroplating the underlayer onto the easily removable layer;

[0048] S3: Electroplat a high-temperature resistant layer onto the base layer;

[0049] S4: Electroplating a protective layer on the high-temperature resistant layer.

[0050] By using different target materials and controlling the gas flow rate and electroplating time, protective coatings with different component contents and thicknesses are formed on the flexible cover glass substrate in the embodiments.

[0051] Example 1

[0052] In this embodiment, the components and thicknesses of the protective coating, including the easy-to-remove layer, the undercoat, the high-temperature resistant layer, and the protective layer, are as follows:

[0053] Easy-to-remove layer: molybdenum coating; thickness 300nm;

[0054] The base layer consists of 25% Ti, 30% Al, 25% Si, and 20% N; with a thickness of 50 nm.

[0055] High-temperature resistant layer: 20% Ti, 30% Si, 15% N, 35% O; thickness 50nm;

[0056] Protective layer: 18% Ti, 20% Si, 10% N, 50% O, 2% C; thickness 50nm.

[0057] Example 2

[0058] In this embodiment, the components and thicknesses of the protective coating, including the easy-to-remove layer, the undercoat, the high-temperature resistant layer, and the protective layer, are as follows:

[0059] Easy-to-remove layer: molybdenum coating; thickness 300nm;

[0060] The base layer consists of 25% Ti, 25% Al, 30% Si, and 20% N; with a thickness of 50 nm.

[0061] High-temperature resistant layer: 25% Ti, 25% Si, 20% N, 30% O; thickness 50nm;

[0062] Protective layer: 15% Ti, 25% Si, 20% N, 30% O, 10% C; thickness 50nm.

[0063] Example 3

[0064] In this embodiment, the components and thicknesses of the protective coating, including the easy-to-remove layer, the undercoat, the high-temperature resistant layer, and the protective layer, are as follows:

[0065] Degradable layer: 99% Mo, 1% Pt; thickness 300 nm;

[0066] The base layer consists of 15% Ti, 20% Al, 15% Mo, 30% Si, and 20% N; with a thickness of 50 nm.

[0067] High-temperature resistant layer: 3% Ti, 17% Al, 5% Cr, 25% Si, 20% N, 30% O; thickness 50nm;

[0068] Protective layer: 1% Ti, 30% Al, 4% Cr, 15% Si, 10% N, 35% O, 5% C; thickness 50nm.

[0069] Example 4

[0070] In this embodiment, the components and thicknesses of the protective coating, including the easy-to-remove layer, the undercoat, the high-temperature resistant layer, and the protective layer, are as follows:

[0071] Easy-to-remove layer: molybdenum coating; thickness 30μm;

[0072] Base layer: 10% Ti, 25% Al, 15% Mo, 5% Cr, 25% Si, 20% N; thickness 20nm;

[0073] High-temperature resistant layer: 20% Ti, 20% Mo, 5% Cr, 5% Si, 15% N, 35% O; thickness 10nm;

[0074] Protective layer: 18% Ti, 20% Mo, 5% Si, 5% N, 50% O, 2% C; thickness 80nm.

[0075] Example 5

[0076] In this embodiment, the components and thicknesses of the protective coating, including the easy-to-remove layer, the undercoat, the high-temperature resistant layer, and the protective layer, are as follows:

[0077] Easy-to-remove layer: molybdenum coating; thickness 30μm;

[0078] Base layer: 10% Ti, 25% Al, 15% Mo, 5% Cr, 25% Si, 20% N; thickness 20nm;

[0079] High-temperature resistant layer: 20% Ti, 20% Mo, 5% Cr, 5% Si, 15% N, 35% O; thickness 10nm;

[0080] Protective layer: 30% Ti, 10% Mo, 5% Cr, 10% Si, 10% N, 30% O, 5% C; thickness 80nm.

[0081] Comparative Example 1

[0082] The difference between this comparative protective coating and Example 1 is that it does not include the easily removable layer, while the remaining coatings are the same as in Example 1.

[0083] Comparative Example 2

[0084] The difference between this comparative protective coating and Example 1 is that the easily removable layer is a Ti coating, while the remaining coatings are the same as in Example 1.

[0085] Comparative Example 3

[0086] The difference between this comparative protective coating and Example 1 is that the easily removable layer is a Cr coating, while the remaining coatings are the same as in Example 1.

[0087] Comparative Example 4

[0088] The difference between this comparative protective coating and Example 1 is that the easily removable layer is a TiAl coating (40% Ti + 60% Al), while the remaining coatings are the same as in Example 1.

[0089] Comparative Example 5

[0090] The difference between this comparative protective coating and Example 1 is that the easily removable layer is graphite, while the remaining coatings are the same as in Example 1.

[0091] Comparative Example 6

[0092] The difference between this comparative protective coating and Example 1 is that it does not include the undercoat, while the remaining coatings are the same as in Example 1.

[0093] Comparative Example 7

[0094] The difference between this comparative protective coating and Example 1 is that the underlayer consists of 25% Ti, 30% Al, and 45% N; the remaining coatings are the same as in Example 1.

[0095] Comparative Example 8

[0096] The difference between this comparative protective coating and Example 1 is that the underlayer consists of 25% Ti, 30% Al, and 45% Si; the remaining coatings are the same as in Example 1.

[0097] Comparative Example 9

[0098] The difference between this comparative protective coating and Example 1 is that it does not include a high-temperature resistant layer, while the remaining coatings are the same as in Example 1.

[0099] Comparative Example 10

[0100] The difference between this comparative protective coating and Example 1 is that the high-temperature resistant layer consists of 20% Ti, 30% Si, and 50% N; the remaining coatings are the same as in Example 1.

[0101] Comparative Example 11

[0102] The difference between this comparative protective coating and Example 1 is that the high-temperature resistant layer consists of 20% Ti, 30% Si, and 50% O; the remaining coatings are the same as in Example 1.

[0103] Comparative Example 12

[0104] The difference between this comparative protective coating and Example 1 is that the high-temperature resistant layer is 45% Ti and 55% Si; the remaining coatings are the same as in Example 1.

[0105] Comparative Example 13

[0106] The difference between this comparative protective coating and Example 1 is that it does not include a protective layer, while the remaining coatings are the same as in Example 1.

[0107] Comparative Example 14

[0108] The difference between this comparative protective coating and Example 1 is that the protective layer consists of 18% Ti, 20% Si, 12% N, and 50% O; the remaining coatings are the same as in Example 1.

[0109] Comparative Example 15

[0110] The difference between this comparative protective coating and Example 1 is that it contains 18% Ti, 20% Si, 50% O, and 12% C; the remaining coatings are the same as in Example 1.

[0111] Comparative Example 16

[0112] The difference between this comparative protective coating and Example 1 is that it contains 18% Ti, 20% Si, 10% N, 37% O, and 15% C; the remaining coatings are the same as in Example 1.

[0113] Comparative Example 17

[0114] The difference between this comparative protective coating and Example 1 is that the undercoat and the high-temperature resistant layer are replaced. That is, the high-temperature resistant layer is electroplated first on the easily removable layer, and then the undercoat is electroplated. The remaining coatings and the components of each layer are the same as in Example 1.

[0115] Comparative Example 18

[0116] The difference between this comparative protective coating and Example 1 is that the high-temperature resistant layer and the protective layer are replaced, that is, the protective layer is electroplated first on the base layer, and then the high-temperature resistant layer is electroplated; the remaining coatings and the components of each layer are the same as in Example 1.

[0117] Comparative Example 19

[0118] In this comparative example, the protective coating uses alternating molybdenum coating and titanium aluminum nitrogen coating, as follows: first, a 300nm thick molybdenum coating is electroplated, then a 50nm thick titanium aluminum nitrogen coating (25% Ti, 30% Al, 45% N) is electroplated, then a 50nm thick molybdenum coating is electroplated, and finally a 50nm thick titanium aluminum nitrogen coating (25% Ti, 30% Al, 45% N) is electroplated.

[0119] Comparative Example 20

[0120] In this comparative example, the protective coating uses a molybdenum coating + an aluminum coating, specifically as follows: first, a 300nm thick molybdenum coating is electroplated, and then a 150nm thick aluminum coating is electroplated.

[0121] The flexible cover glass with protective coating in the above embodiments and comparative examples 1-20 were subjected to thermoplastic processing tests and coating removal tests.

[0122] Thermoplastic processing test method: Place the flexible cover glass with protective coating in a heating furnace and heat it from room temperature to 800℃ to simulate the thermoplastic processing of flexible cover glass. After cooling, observe whether the flexible cover glass shows an increase in surface roughness or cracking.

[0123] Film removal test: Flexible cover glass that did not show increased surface roughness or cracking during thermoplastic processing is subjected to film removal treatment. After film removal, the light transmittance of the flexible cover glass is observed to be reduced (such as discoloration or fogging). The film removal agent consists of the following components in the indicated mass percentages: potassium permanganate 15%, hydrogen peroxide 15%, hydrochloric acid 1.5%, citric acid 5%, honey 3%, and the remainder is water. Film removal method: Soak for 30 minutes, then rinse with warm water and air dry.

[0124] The test results are shown in Table 1 below.

[0125]

[0126]

[0127] Example 1: Flexible cover glass after electroplating protective coating, such as... Figure 1 As shown in Figure a; the flexible cover glass after thermoplastic processing is as follows: Figure 1 As shown in Figure b, the color has darkened compared to before thermoplastic processing; the flexible cover glass after film removal is as follows: Figure 1 As shown in c.

[0128] Example 2: Flexible cover glass after electroplating protective coating, such as... Figure 2 As shown in Figure a, the flexible cover glass after thermoplastic processing is as follows: Figure 2 As shown in Figure b, the color becomes lighter compared to before thermoplastic processing; the flexible cover glass after film removal is as follows: Figure 2 As shown in c.

[0129] Example 3: Flexible cover glass after electroplating protective coating, such as... Figure 3 As shown in Figure a, the flexible cover glass after thermoplastic processing is as follows: Figure 3 As shown in Figure b, the flexible cover glass, after film removal, shows a complete color change compared to before thermoplastic processing; Figure 3 As shown in c.

[0130] Comparative Example 1: Flexible cover glass after electroplating protective coating, such as... Figure 4 As shown in Figure a; the flexible cover glass after thermoplastic processing is as follows: Figure 4 As shown in b, the color becomes lighter compared to before thermoplastic processing.

[0131] Comparative Example 2: Flexible cover glass after electroplating protective coating, such as... Figure 5 As shown in Figure a, the flexible cover glass after thermoplastic processing is as follows: Figure 5 As shown in b, the color becomes lighter compared to before thermoplastic processing.

[0132] Comparative Example 4: Flexible cover glass after electroplating protective coating, such as... Figure 6 As shown in Figure a, the flexible cover glass after thermoplastic processing is as follows: Figure 6 As shown in Figure b, the color changes compared to before thermoplastic processing.

[0133] Comparative Example 9: Flexible cover glass after electroplating protective coating, such as... Figure 7 As shown in Figure a, the flexible cover glass after thermoplastic processing is as follows: Figure 7 As shown in b, it becomes lighter compared to before thermoplastic processing.

[0134] Comparative Example 13: Flexible cover glass after electroplating protective coating, such as... Figure 8 As shown in Figure a, the flexible cover glass after thermoplastic processing is as follows: Figure 8 As shown in Figure b, the color changes compared to before thermoplastic processing.

[0135] Comparative Example 20: Flexible cover glass after electroplating protective coating, such as Figure 9 As shown in Figure a, the flexible cover glass after thermoplastic processing is as follows: Figure 9 As shown in b, the color remains basically unchanged compared to before thermoplastic processing.

[0136] As can be seen from the test results of the above embodiments and comparative examples, the coating structure and the composition and content of each coating layer of the protective coating are closely related to the coefficient of thermal expansion of the protective coating, which determines whether the protective coating can be matched with flexible cover glass for thermoplastic processing. The protective coating of this embodiment can avoid the increase of glass surface roughness or cracking during the thermoplastic bending of flexible cover glass, achieve the expected protective effect, and ensure the smoothness and light transmittance of the glass after decoating, thereby improving the processing complexity and yield of flexible glass.

[0137] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A protective coating for thermoplastic processing of glass, characterized in that, From bottom to top, the layers are: easy-to-remove layer, base coat, high-temperature resistant layer, and protective layer; The easily removable layer is a molybdenum coating or a molybdenum-platinum alloy coating, wherein the molybdenum content in the molybdenum-platinum alloy coating is not less than 98% by mass. The underlayer comprises the following components by mass: 1-25% Ti, 1-30% Al, 1-30% Si, and 1-20% N; The high-temperature resistant layer comprises the following components by mass: 1-25% Ti, 1-30% Si, 1-20% N, 1-50% O, and 0-30% Al; The protective layer comprises the following components in terms of mass content: 1-25% Ti, 1-30% Si, 1-20% N, 1-50% O, 1-10% C, and 0-30% Al.

2. The protective coating for thermoplastic processing of glass according to claim 1, characterized in that, The thickness of the easily degradable layer is 3nm-30μm.

3. The protective coating for thermoplastic processing of glass according to claim 1, characterized in that, The thickness of the substrate is 1-100nm.

4. The protective coating for thermoplastic processing of glass according to claim 1, characterized in that, The thickness of the high-temperature resistant layer is 1-100 nm.

5. The protective coating for thermoplastic processing of glass according to claim 1, characterized in that, The thickness of the protective layer is 1-100 nm.

6. The method for preparing a protective coating for thermoplastic processing of glass as described in any one of claims 1-5, characterized in that, The steps include: S1: An easily removable layer is electroplated onto a glass substrate; S2: Electroplating the underlayer onto the easily removable layer; S3: Electroplat a high-temperature resistant layer onto the base layer; S4: Electroplating a protective layer on the high-temperature resistant layer.

7. The preparation method according to claim 6, characterized in that, The electroplating of an easily removable layer on a glass substrate specifically involves depositing a molybdenum coating or a molybdenum-platinum alloy coating on the glass substrate under a vacuum of 0.1-10 Pa and an argon atmosphere using a molybdenum target or a molybdenum-platinum alloy target.

8. The preparation method according to claim 6, characterized in that, The electroplating of the underlayer on the easily degradable layer specifically involves using a titanium-aluminum-silicon target or a titanium-aluminum-silicon-nitrogen target, under a vacuum of 0.1-10 Pa, and in an argon and nitrogen atmosphere, to deposit the underlayer on the easily degradable layer.

9. The preparation method according to claim 6, characterized in that, The aforementioned electroplating of a high-temperature resistant layer on the underlayer specifically involves using a titanium-silicon target or a titanium-aluminum-silicon target, under a vacuum of 0.1-10 Pa, in an environment of argon, nitrogen, and oxygen, to deposit a high-temperature resistant layer on the easily degradable layer.

10. The preparation method according to claim 6, characterized in that, Specifically, the electroplating of the protective layer on the high-temperature resistant layer involves depositing a high-temperature resistant layer on an easily degradable layer using a titanium-silicon target or a titanium-aluminum-silicon target, under a vacuum of 0.1-10 Pa and in an environment of argon, nitrogen, oxygen, and acetylene.

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