CN109553309B - Laminated glass for building and preparation method thereof - Google Patents

Abstract

The present invention discloses a laminated glass for building, which comprises a first high-aluminum glass original sheet, a second high-aluminum glass original sheet and an interlayer between the first high-aluminum glass original sheet and the second high-aluminum glass original sheet, a first anti-reflection composite medium layer and a first top protective layer are sequentially formed on the surface of the first high-aluminum glass original sheet away from the second high-aluminum glass original sheet, a second anti-reflection composite medium layer and a second top protective layer are sequentially formed on the surface of the second high-aluminum glass original sheet away from the first high-aluminum glass original sheet, and the first anti-reflection composite medium layer and the second anti-reflection composite medium layer respectively include at least four refractive index layers. The present invention also discloses a method for preparing laminated glass for building. The laminated glass for building has the advantages of thin thickness, good optical performance and high strength.

Description

Laminated glass for building and preparation method thereof

Technical Field

The invention relates to the field of glass preparation, in particular to a laminated glass for building and a preparation method thereof.

Background technique

Light will reflect at the interface between two media. When light is irradiated vertically to the uncoated glass surface, the reflected light accounts for about 8% of the incident light. In many applications of optical components, the reflection on the surface not only affects the light transmission energy of the optical component, but also forms stray light in the instrument, thus affecting the imaging quality of the optical instrument. In order to solve these problems, a single or multi-layer optical adjustment film of a certain thickness is usually coated on the surface of the optical component to reduce the reflected light on the surface of the component. Such an optical adjustment film is an anti-reflection film.

The main function of anti-reflection coating is to reduce or eliminate reflected light from the surface of optical components, thereby increasing the amount of light transmitted by these components.

Ordinary glass has a high reflection coefficient, which will produce reflection under sunlight, making it difficult for people to see the objects behind the glass. In order to reduce reflection, enhance visual effects, reduce the reflection coefficient of the glass surface, and ensure that the glass maintains a good light transmittance under sunlight, anti-reflective glass with anti-reflective film coated on ordinary glass has appeared.

Most of the current anti-reflection films are coated on ordinary float glass sheets, using a single-piece coating structure. The existing large-area anti-reflection coated glass processing methods often use PECVD or sol-gel methods, and the anti-reflection composite dielectric layer deposited on the glass surface is usually made of porous nano-silicon materials, such as patents CN105440742A, CN101885586B, etc. However, when the coated glass is required to have better optical and mechanical properties, the total thickness of the film is generally relatively thick and the production efficiency is relatively low.

Summary of the invention

Based on this, the object of the present invention is to provide a laminated glass for building and a preparation method thereof.

A laminated glass for building, comprising a first high-aluminum glass original sheet, a second high-aluminum glass original sheet and an interlayer located between the first high-aluminum glass original sheet and the second high-aluminum glass original sheet, wherein a first anti-reflection composite medium layer and a first top protective layer are sequentially formed on a surface of the first high-aluminum glass original sheet away from the second high-aluminum glass original sheet, and a second anti-reflection composite medium layer and a second top protective layer are sequentially formed on a surface of the second high-aluminum glass original sheet away from the first high-aluminum glass original sheet, and the first anti-reflection composite medium layer and the second anti-reflection composite medium layer respectively comprise at least four refractive index layers.

The first anti-reflection composite medium layer includes a first refractive index layer, a second refractive index layer and/or a third refractive index layer having different refractive indices.

In the direction in which the first high-aluminum glass original sheet is away from the second high-aluminum glass original sheet, the first anti-reflection composite medium layer includes a niobium pentoxide layer, a silicon dioxide layer, a niobium pentoxide layer, a silicon dioxide layer and a silicon nitride layer in sequence.

In the direction in which the first high-aluminum glass original sheet is away from the second high-aluminum glass original sheet, the first anti-reflection composite medium layer includes a silicon oxynitride layer, a niobium pentoxide layer, a silicon dioxide layer and a silicon nitride layer in sequence.

In the direction in which the first high-aluminum glass original sheet is away from the second high-aluminum glass original sheet, the first anti-reflection composite medium layer includes a silicon nitride layer, a silicon oxide layer, a silicon nitride layer, a silicon oxide layer and a silicon nitride layer in sequence.

In the direction in which the first high-aluminum glass original sheet is away from the second high-aluminum glass original sheet, the first anti-reflection composite medium layer includes a silicon oxynitride layer, a silicon nitride layer, a silicon dioxide layer and a silicon nitride layer in sequence.

The thickness of the first anti-reflection composite medium layer is 200nm-270nm.

The thickness of the first high-aluminum glass original sheet or the second high-aluminum glass original sheet is 1 to 15 mm.

The second anti-reflection composite dielectric layer has the same structure as the first anti-reflection composite dielectric layer.

A method for preparing laminated glass for construction comprises the following steps: cleaning a high-aluminum glass original sheet; plating a bottom dielectric layer on the surface of the high-aluminum glass original sheet by using a medium-frequency AC power supply and a rotating cathode; plating an anti-reflection composite dielectric layer on the bottom dielectric layer by using a medium-frequency AC power supply and a rotating cathode, the anti-reflection composite dielectric layer comprising at least four refractive index layers; spraying a top protective layer on the anti-reflection composite dielectric layer to form an anti-reflection coated glass; and performing a laminate treatment on the anti-reflection coated glass.

The coordinated structure of the layers in the above-mentioned laminated glass for construction makes the laminated glass film layer thinner, which not only has excellent optical properties, but also has extremely high mechanical properties and anti-fouling properties, and can be well applied to the fields of building window and wall glass and interior decorative glass.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic cross-sectional view of a laminated glass for construction according to an embodiment of the present invention.

FIG. 2 is an enlarged schematic diagram of the first anti-reflection composite dielectric layer in FIG. 1 .

FIG. 3 is an enlarged schematic diagram of a first anti-reflection composite dielectric layer according to another embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a laminated glass for construction according to another embodiment of the present invention.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention is described more fully below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

Please refer to Figure 1, which is a cross-sectional schematic diagram of a laminated glass for building according to an embodiment of the present invention. The laminated glass for building 10 includes an interlayer 11, a first high-aluminum glass original sheet 12, a second high-aluminum glass original sheet 13, a first bottom dielectric layer 14, a second bottom dielectric layer 15, a first anti-reflection composite dielectric layer 16, a second anti-reflection composite dielectric layer 17, a first top protective layer 18 and a second top protective layer 19. Among them, the interlayer 11 is located between the first high-aluminum glass original sheet 12 and the second high-aluminum glass original sheet 13. The first bottom dielectric layer 14, the first anti-reflection composite dielectric layer 16 and the first top protective layer 18 are sequentially formed on the surface of the first high-aluminum glass original sheet 12 away from the second high-aluminum glass original sheet 13; the second bottom dielectric layer 15, the second anti-reflection composite dielectric layer 17 and the second top protective layer 19 are sequentially formed on the surface of the second high-aluminum glass original sheet 13 away from the first high-aluminum glass original sheet 12.

Specifically in this embodiment, the interlayer 11 can be made of high-transmittance polyvinyl butyral (PVB), and its thickness can be 0.38-1.52 mm.

The thickness of the first high-aluminum glass original sheet 12 or the second high-aluminum glass original sheet 13 can be 1 to 15 millimeters (mm), for example, 1.6 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 8 mm, 10 mm; and its maximum size is, for example, 2440 mm*3660 mm.

The first top protective layer 18 and the second top protective layer 19 are made of hydrophobic materials and can be used for anti-fingerprint or anti-fouling; they can be prepared by selecting a synthetic polymer of perfluoropolyether (PFPE) as a main agent material and using a mixture of methyl-nonafluorobutyl ether and ethyl-nonafluorobutyl ether as a diluent. The water drop angle of the first top protective layer 18 or the second top protective layer 19 can be greater than or equal to 110°.

The thickness of the first anti-reflection composite dielectric layer 16 or the second anti-reflection composite dielectric layer 17 may be 100 nm to 500 nm, preferably 200 nm to 270 nm. The first anti-reflection composite dielectric layer 16 or the second anti-reflection composite dielectric layer 17 may include at least four refractive index layers, for example, at least four refractive index layers including a first refractive index layer, a second refractive index layer and/or a third refractive index layer having different refractive indices. The refractive index of the first refractive index layer is the largest, the refractive index of the third refractive index layer is the smallest, and the refractive index of the second refractive index layer is in the middle; wherein, the refractive index of the first refractive index layer is between 2.0 and 2.5, and it can be formed of silicon nitride (Si ₃ N ₄ ), niobium pentoxide (Nb ₂ O ₅ ) or titanium dioxide (TiO ₂ ); the refractive index of the second refractive index layer is between 1.77 and 1.9, and it can be formed of silicon oxynitride (SiOxNy), wherein the range of x/y is between 2/10 and 3/10; the refractive index of the third refractive index layer is between 1.47 and 1.53, and it can be formed of silicon dioxide (SiO ₂ ).

Please refer to Fig. 2, taking the first anti-reflection composite dielectric layer 16 as an example, in the direction in which the first high-aluminum glass original sheet 12 is away from the second high-aluminum glass original sheet 13, the first anti-reflection composite dielectric layer 16 includes the second refractive index layer 162, the first refractive index layer 161, the third refractive index layer 163 and the first refractive index layer 161 in sequence. Please refer to Fig. 3, in another embodiment, the first anti-reflection composite dielectric layer 26 includes the first refractive index layer 261, the third refractive index layer 263, the first refractive index layer 261, the third refractive index layer 263 and the first refractive index layer 261 in sequence in the direction in which the first high-aluminum glass original sheet is away from the second high-aluminum glass original sheet.

The above-mentioned laminated glass for construction 10 has an interlayer, a bottom dielectric layer, an anti-reflection composite dielectric layer and a top protective layer, wherein the bottom dielectric layer can improve the connection strength between the original glass sheet and the anti-reflection composite dielectric layer and the subsequent processability of the laminated glass for construction 10; the anti-reflection composite dielectric layer can apply the principle of optical interference reflection to make the visible light reflectance of a single-piece coated glass and a high-aluminum glass original sheet interlayer ≤5%, and the visible light reflectance of two pieces of coated glass interlayer ≤1%, and its appearance presents a natural neutral color; the top protective layer can not only protect the surface of the coated glass from dirt and dirt and be easy to clean, but also prevent the coated layer from scratching, chemical corrosion and other defects, and ensure the integrity of the product during transportation, installation and use. The matching structure of each layer in the above-mentioned laminated glass for construction 10 makes the laminated glass film layer thinner, which not only has excellent optical properties, but also has extremely high mechanical properties and anti-fouling properties, and can be well applied to the fields of building window wall glass and indoor decorative glass.

Please refer to FIG. 4, which is a cross-sectional schematic diagram of another embodiment of the architectural laminated glass of the present invention. The architectural laminated glass 30 is similar to the architectural laminated glass 10, and includes an interlayer 31, a first high-aluminum glass original sheet 32, a second high-aluminum glass original sheet 33, a first bottom dielectric layer 34, a first anti-reflection composite dielectric layer 36, and a first top protective layer 38. Among them, the interlayer 31 is located between the first high-aluminum glass original sheet 32 and the second high-aluminum glass original sheet 33. The first bottom dielectric layer 34, the first anti-reflection composite dielectric layer 36, and the first top protective layer 38 are sequentially formed on the surface of the first high-aluminum glass original sheet 32 away from the second high-aluminum glass original sheet 33.

In addition, it can be understood that when the refractive index layer closest to the high-aluminum glass original sheet in the anti-reflection composite dielectric layer is formed by SiOxNy or _SiO2 , the bottom dielectric layer can also be omitted.

The present invention also provides a method for preparing the above-mentioned laminated glass for construction, which may include the following steps.

First, clean the high-aluminum glass original sheet. After the high-aluminum glass original sheet is loaded on the automatic loading table, it is cleaned and polished by a large automatic cleaning and polishing machine.

Next, a bottom dielectric layer is plated on the surface of the high-aluminum glass original sheet using a medium-frequency AC power supply and a rotating cathode. After the cleaned high-aluminum glass original sheet is dried, a bottom dielectric layer can be plated on the surface of the high-aluminum glass original sheet using a medium-frequency AC power supply and a rotating cathode, wherein the background vacuum of the magnetron sputtering coating equipment can be required to be above 10 ^-6 to 10 ^-7 mbar, and the sputtering process vacuum can be required to be between 3 and 8*10 ^-3 mbar.

Next, a medium frequency AC power supply and a rotating cathode are used to plate an anti-reflection composite dielectric layer on the bottom dielectric layer. The anti-reflection composite dielectric layer is plated on the top of the bottom dielectric layer. The anti-reflection composite dielectric layer can have a large adhesion. During the plating, the background vacuum degree of the magnetron sputtering coating equipment can be required to be above ^10-6 to ^10-7 mbar, and the sputtering process vacuum degree can be required to be between 3 and 8* ^10-3 mbar. The first refractive index layer, the second refractive index layer and/or the third refractive index layer with different refractive indices in the anti-reflection composite dielectric layer can be formed by plating in sequence using different target materials.

Next, a top protective layer is sprayed on the anti-reflection composite dielectric layer to form an anti-reflection coated glass. The top protective layer can be formed by a spraying process. In detail, the spraying material can be selected from a synthetic polymer of perfluoropolyether (PFPE) as the main agent material and a mixture of methyl-nonafluorobutyl ether and ethyl-nonafluorobutyl ether as a diluent; when spraying, the spraying distance can be 200-300mm, the spray gun or glass running speed can be 400-500mm/s, and the spraying overlap rate is maintained at 20%-30%. Depending on the time requirements of the subsequent interlayer process, the anti-reflection coated glass sprayed with the top protective layer that undergoes the interlayer process more than 48 hours later does not need to be heated to cure the top protective layer. Products that undergo the interlayer process within 48 hours need to be heated between 120℃ and 150℃ for 20-30 minutes to cure the top protective layer.

Then, the anti-reflection coated glass is cut. In this step, the anti-reflection coated glass can be cut or edged according to subsequent product requirements.

Finally, the anti-reflective coated glass is laminated. In this step, two types of structures can be formed according to the needs of subsequent products: high aluminum glass original sheet/laminated/anti-reflective coated glass and anti-reflective coated glass/laminated/anti-reflective coated glass. Among them, the visible light reflectivity of the laminated glass of the high aluminum glass original sheet/laminated/anti-reflective coated glass structure can be less than or equal to 5%; the visible light reflectivity of the laminated glass of the anti-reflective coated glass/laminated/anti-reflective coated glass structure can be less than or equal to 1%.

The preparation method of the laminated glass for construction is to adopt the process of off-line coating by magnetron sputtering, to coat various inorganic materials of different thicknesses on the surface of high-aluminum glass, and to coat the surface of the glass with a hydrophobic film layer, and to apply the principle of optical interference reflection, so that the visible light reflectivity of a single-piece coated glass and a high-aluminum glass original sheet after interlayer is ≤5%, and the visible light reflectivity of two-piece coated glass after interlayer is ≤1%, and its appearance presents a natural neutral color. The film thickness is nanometer-level, and the film structure does not contain precious metals such as Ag and Au, which greatly reduces the production cost. Furthermore, due to the use of large-scale magnetron sputtering coating equipment, large-area and large-size batch production is possible. In addition, the anti-reflective coated glass prepared by the above method has good processing resistance and weather resistance, and can realize the subsequent processing of the product outsourcing factory, driving the entire glass deep processing enterprise, and can further integrate and improve production efficiency and reduce costs.

Specific embodiment 1

A 20nm bottom _SiO2 bottom dielectric layer is plated on _{a 3mm} high-aluminum glass original sheet, and then _Nb2O5 / _SiO2 / _Nb2O5 / _SiO2 / _Si3N4 are plated in sequence to form an anti-reflection composite dielectric layer with a total thickness of _235nm . The thicknesses of the refractive index layers are 12.5/33/117.5/67/5nm in sequence. The sputtering dynamic deposition rate of the above refractive index layers is 2.8nm·(m/min)/KW to 4.5nm·(m/min)/KW; the vacuum degree of magnetron sputtering is 3* ^10-3 mbar to 8* ^10-3 mbar.

After spraying a hydrophobic top protective layer on the anti-reflection composite dielectric layer, the glass was kept in a heating furnace at 150° C. for 25 minutes.

The high-aluminum glass coated with anti-reflection film is laminated with high-aluminum glass original sheet with the same thickness and high-aluminum anti-reflection coated glass with the same thickness. The film is high-transmittance PVB with a thickness of 0.38mm.

After the product is manufactured, the high aluminum glass original sheet/film/high aluminum anti-reflective coated glass forms a single-piece coated glass sandwich structure, and the high aluminum anti-reflective coated glass/film/high aluminum anti-reflective coated glass forms a double-piece coated glass sandwich structure. The visible light reflection and transmission properties of the two types of laminated glass are shown in the following table.

Specific embodiment 2

SiOxNy/Nb ₂ O ₅ /SiO ₂ /Si ₃ N ₄ were sequentially plated on a 3 mm high aluminum glass substrate to form an anti-reflection composite dielectric layer with a total thickness of 204.6 nm, and the thicknesses of the refractive index layers were 92.5/24.3/82.8/5 nm, respectively. The sputtering dynamic deposition rate of the above refractive index layers was 2.8 nm·(m/min)/KW to 4.5 nm·(m/min)/KW; the vacuum degree of magnetron sputtering was 3*10 ^-3 mbar to 8*10 ^-3 mbar, and the flow ratio of O ₂ /N ₂ in the reaction gas for coating the SiOxNy layer was 2.5/10.

After spraying a hydrophobic top protective layer on the anti-reflection composite dielectric layer, the glass was kept in a heating furnace at 150° C. for 25 minutes.

The high-aluminum glass coated with anti-reflection film is laminated with high-aluminum glass original sheet of the same thickness and high-aluminum anti-reflection coated glass of the same thickness. The film selected is high-transmittance PVB with a thickness of 0.38mm.

After the product is manufactured, the high aluminum glass original sheet/film/high aluminum anti-reflective coated glass forms a single-piece coated glass sandwich structure, and the high aluminum anti-reflective coated glass/film/high aluminum anti-reflective coated glass forms a double-piece coated glass sandwich structure. The visible light reflection and transmission properties of the two types of laminated glass are shown in the following table.

Specific embodiment 3

A 20nm bottom _SiO2 dielectric layer is plated on a 6mm high-aluminum glass substrate, and then _{Si3N4 / SiO2} / _Si3N4 / _SiO2 / _Si3N4 are plated in sequence to form an anti-reflection composite dielectric layer with a total thickness of _233.1nm . The thicknesses of the refractive index layers are 14.3/30/118.8/64 _/ 6nm in sequence. The sputtering dynamic deposition rate of the above refractive index layers is 2.8nm·(m/min)/KW to 4.5nm·(m/min)/KW; the vacuum degree of magnetron sputtering is 3* ^10-3 mbar to 8* ^10-3 mbar.

After spraying a hydrophobic top protective layer on the anti-reflection composite dielectric layer, the glass was kept in a heating furnace at 150° C. for 25 minutes.

The high-aluminum glass coated with anti-reflection film is laminated with high-aluminum glass original sheet with the same thickness and high-aluminum anti-reflection coated glass with the same thickness. The film selected is high-transmittance PVB with a thickness of 0.76mm.

After the product is manufactured, the high aluminum glass original sheet/film/high aluminum anti-reflective coated glass forms a single-piece coated glass sandwich structure, and the high aluminum anti-reflective coated glass/film/high aluminum anti-reflective coated glass forms a double-piece coated glass sandwich structure. The visible light reflection and transmission properties of the two types of laminated glass are shown in the following table.

Specific embodiment 4

SiOxNy/Si ₃ N ₄ /SiO ₂ /Si ₃ N ₄ were sequentially plated on a 6mm high-aluminum glass substrate to form an anti-reflection composite dielectric layer with a total thickness of 209.8nm, and the thicknesses of the refractive index layers were 95/20/88.8/6nm. The sputtering dynamic deposition rate of the above refractive index layers was 2.8nm·(m/min)/KW to 4.5nm·(m/min)/KW; the vacuum degree of magnetron sputtering was 3*10 ^-3 mbar to 8*10 ^-3 mbar, and the flow ratio of O ₂ /N ₂ in the reaction gas for coating the SiOxNy layer was 3/10.

After spraying a hydrophobic top protective layer on the anti-reflection composite dielectric layer, the glass was kept in a heating furnace at 150° C. for 25 minutes.

The high-aluminum glass coated with anti-reflection film is laminated with the original high-aluminum glass of the same thickness and the high-aluminum anti-reflection coated glass of the same thickness. The film selected is high-transmittance PVB with a thickness of 0.76mm.

After the product is manufactured, the high aluminum glass original sheet/film/high aluminum anti-reflective coated glass forms a single-piece coated glass sandwich structure, and the high aluminum anti-reflective coated glass/film/high aluminum anti-reflective coated glass forms a double-piece coated glass sandwich structure. The visible light reflection and transmission properties of the two types of laminated glass are shown in the following table.

The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims (7)

1. The laminated glass for the building comprises a first high-alumina glass raw sheet, a second high-alumina glass raw sheet and an interlayer positioned between the first high-alumina glass raw sheet and the second high-alumina glass raw sheet, and is characterized in that a first antireflection composite medium layer and a first top protection layer are sequentially formed on the surface of the first high-alumina glass raw sheet far away from the second high-alumina glass raw sheet, a second antireflection composite medium layer and a second top protection layer are sequentially formed on the surface of the second high-alumina glass raw sheet far away from the first high-alumina glass raw sheet, and the first antireflection composite medium layer and the second antireflection composite medium layer respectively comprise at least four refractive index layers; the laminated glass for the building further comprises a first bottom dielectric layer and a second bottom dielectric layer, wherein the first bottom dielectric layer, the first anti-reflection composite dielectric layer and the first top protective layer are sequentially formed on the surface, far away from the second high-alumina glass raw sheet, of the first high-alumina glass raw sheet; the second bottom dielectric layer, the second anti-reflection composite dielectric layer and the second top protective layer are sequentially formed on the surface of the second high-alumina glass raw sheet far away from the first high-alumina glass raw sheet; the first anti-reflection composite dielectric layer comprises a first refractive index layer, a second refractive index layer and a third refractive index layer with different refractive indexes, wherein the refractive index of the first refractive index layer is the largest, the refractive index of the third refractive index layer is the smallest, the refractive index of the second refractive index layer is centered, the refractive index of the second refractive index layer is 1.77-1.9, the second refractive index layer is formed by silicon oxynitride SiO _xN_y, and the range of x/y is 2/10-3/10; the first anti-reflection composite medium layer sequentially comprises the second refractive index layer, the first refractive index layer, the third refractive index layer and the first refractive index layer.

2. The laminated glass for construction according to claim 1, wherein the first antireflection composite dielectric layer comprises a silicon oxynitride layer, niobium pentoxide, silicon dioxide layer and silicon nitride layer in this order in a direction in which the first raw high-alumina glass sheet is away from the second raw high-alumina glass sheet.

3. The laminated glass for construction according to claim 1, wherein the first antireflection composite dielectric layer comprises a silicon oxynitride layer, a silicon nitride layer, a silicon dioxide layer and a silicon nitride layer in this order in a direction in which the first raw high-alumina glass sheet is away from the second raw high-alumina glass sheet.

4. The laminated glass for building according to claim 1, wherein the thickness of the first antireflection composite dielectric layer is 200nm to 270nm.

5. The laminated glass for construction according to claim 1, wherein the thickness of the first raw high-alumina glass sheet or the second raw high-alumina glass sheet is 1 to 15 mm.

6. The laminated glass for construction according to claim 1, wherein the second antireflection composite medium layer has the same structure as the first antireflection composite medium layer.

7. A method for preparing laminated glass for construction, comprising the steps of:

cleaning a high-alumina glass raw sheet;

plating a bottom dielectric layer on the surface of the high-alumina glass raw sheet by using an intermediate frequency alternating current power supply and a rotating cathode;

plating an anti-reflection composite dielectric layer on the bottom dielectric layer by using an intermediate frequency alternating current power supply and a rotating cathode, wherein the anti-reflection composite dielectric layer comprises at least four refractive index layers;

Spraying a top protective layer on the anti-reflection composite dielectric layer to form anti-reflection coated glass; and

Interlayer treatment is carried out on the anti-reflection coated glass;

The high-alumina glass raw sheet comprises a first high-alumina glass raw sheet and a second high-alumina glass raw sheet, the bottom dielectric layer comprises a first bottom dielectric layer and a second bottom dielectric layer, a first antireflection composite dielectric layer and a first top protective layer are sequentially formed on the surface, far away from the second high-alumina glass raw sheet, of the first high-alumina glass raw sheet, a second antireflection composite dielectric layer and a second top protective layer are sequentially formed on the surface, far away from the first high-alumina glass raw sheet, of the second high-alumina glass raw sheet, and the first antireflection composite dielectric layer and the second antireflection composite dielectric layer respectively comprise at least four refractive index layers;

The first bottom dielectric layer, the first anti-reflection composite dielectric layer and the first top protective layer are sequentially formed on the surface of the first high-alumina glass raw sheet far away from the second high-alumina glass raw sheet; the second bottom dielectric layer, the second anti-reflection composite dielectric layer and the second top protective layer are sequentially formed on the surface of the second high-alumina glass raw sheet far away from the first high-alumina glass raw sheet; the first anti-reflection composite dielectric layer comprises a first refractive index layer, a second refractive index layer and a third refractive index layer with different refractive indexes, wherein the refractive index of the first refractive index layer is the largest, the refractive index of the third refractive index layer is the smallest, the refractive index of the second refractive index layer is centered, the refractive index of the second refractive index layer is 1.77-1.9, the second refractive index layer is formed by silicon oxynitride SiO _xN_y, and the range of x/y is 2/10-3/10; the first anti-reflection composite medium layer sequentially comprises the second refractive index layer, the first refractive index layer, the third refractive index layer and the first refractive index layer.