Neutral grey double-silver Low-E coated glass as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of glass manufacturing, and relates to neutral grey double-silver Low-E coated glass and a preparation method and application thereof.The neutral grey double-silver Low-E coated glass comprises a glass substrate and a coating layer set arranged on the surface of one side of the glass substrate, and the coating layer set faces the direction away from the glass substrate. The coating layer group comprises a first dielectric layer, a first AZO layer, a first Ag layer, a first NiCr layer, a second AZO layer, a second dielectric layer, a third AZO layer, a second Ag layer, a second NiCr layer, a fourth AZO layer, a third dielectric layer and a protective layer which are stacked. The double-silver Low-E coated glass provided by the invention realizes a real neutral gray tone effect, meets the requirements of remote processing and tempering, can adapt to the urgent requirements of the market on high-performance and multifunctional building glass materials, and is beneficial to large-scale popularization and application.

Description

Technical Field

[0001] The present invention belongs to the technical field of glass manufacturing and relates to a Low-E coated glass, in particular to a neutral grey double silver Low-E coated glass and a preparation method and application thereof. Background Art

[0002] As a versatile building material, glass is widely used for its light transmittance and snowproof properties. With the continuous advancement of technology, glass has been endowed with more new functions. Low-E (low-emissivity) coated glass, in particular, has been widely used in building curtain walls due to its rich colors, good texture, and excellent energy-saving properties.

[0003] Low-E coated glass is typically produced using an offline vacuum magnetron sputtering method to deposit a nanofilm layer on the surface of a glass substrate. This improves the glass's optical and thermal properties, achieving decorative, energy-saving, and environmentally friendly goals. Double-silver Low-E coated glass is highly sought after for its high reflectivity of far-infrared radiation, helping to maintain a stable indoor temperature and reduce energy consumption.

[0004] While double-silver Low-E coated glass offers advantages in energy efficiency, existing technology has significant shortcomings in achieving a neutral gray tone. Specifically, while the outdoor reflected color can achieve a neutral gray, the transmitted color is greenish, so the actual visual effect after installation still has a green tint, failing to meet market demand for a neutral gray tone.

[0005] In addition, the film layer structure and material selection of existing technologies limit the processability and temperability of glass, resulting in the product being unable to be processed and tempered remotely. It can only be tempered first and then coated, which limits its application flexibility in the construction field.

[0006] It can be seen that how to provide a neutral gray double silver Low-E coated glass and its preparation method to achieve a true neutral gray tone effect while meeting the requirements of remote processing and tempering to meet the market's urgent demand for high-performance, multifunctional architectural glass materials has become an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0007] In response to the shortcomings of the existing technology, the purpose of the present invention is to provide a neutral gray double silver Low-E coated glass and its preparation method and application, which achieves a true neutral gray tone effect, while meeting the needs of remote processing and tempering, and can adapt to the market's urgent demand for high-performance, multifunctional architectural glass materials, which is conducive to large-scale promotion and application.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a neutral gray double-silver Low-E coated glass, comprising a glass substrate and a coating layer group disposed on one surface of the glass substrate. In a direction away from the glass substrate, the coating layer group includes a first dielectric layer, a first AZO layer, a first Ag layer, a first NiCr layer, a second AZO layer, a second dielectric layer, a third AZO layer, a second Ag layer, a second NiCr layer, a fourth AZO layer, a third dielectric layer, and a protective layer, which are stacked in sequence.

[0010] The present invention optimizes the structural design of the coating layer group. In a direction away from the glass substrate, dielectric layers are respectively disposed at the bottom layer, the middle layer, and the top layer, an NiCr layer is disposed on top of the Ag layer, AZO layers are respectively disposed on both sides, and a protective layer is disposed at the outermost layer. Such a film layer layout achieves specific optical performance indicators, including visible light transmittance, visible light transmission color, visible light reflectance on the glass surface, etc., realizing a true neutral gray tone effect. At the same time, the adhesion between different film layers is enhanced, which plays a good role in preventing Na ion diffusion and protecting the Ag layer. The obtained coated glass has excellent antioxidant performance, meets the requirements of being processable remotely and tempered, improves the processing flexibility of the product, can meet the urgent market demand for high-performance and multifunctional building glass materials, and is conducive to large-scale popularization and application.

[0011] In the present invention, the AZO layer is specifically an aluminum-doped zinc oxide layer.

[0012] Preferably, the first dielectric layer, the second dielectric layer, and the third dielectric layer are each independently an SiN x layer.

[0013] Preferably, the protective layer is a ZrO2 layer.

[0014] Preferably, the thicknesses of the first dielectric layer and the third dielectric layer are each independently 25 - 35 nm, and the thickness of the second dielectric layer is 65 - 75 nm.

[0015] Preferably, the thicknesses of the first AZO layer, the second AZO layer, the third AZO layer, and the fourth AZO layer are each independently 8 - 12 nm.

[0016] Preferably, the thickness of the first Ag layer is 7 - 10 nm, and the thickness of the second Ag layer is 8 - 12 nm.

[0017] Preferably, the thicknesses of the first NiCr layer and the second NiCr layer are each independently 0.5 - 2 nm.

[0018] Preferably, the thickness of the protective layer is 1 - 5 nm.

[0019] Preferably, the glass substrate is float glass.

[0020] Preferably, the thickness of the glass substrate is 5-15 mm.

[0021] In a second aspect, the present invention provides a method for preparing the neutral gray double-silver Low-E coated glass as described in the first aspect. The preparation method includes: depositing a coating layer group on one surface of a glass substrate by using a vacuum magnetron sputtering method according to a set coating sequence to obtain the neutral gray double-silver Low-E coated glass.

[0022] The present invention uses a vacuum magnetron sputtering method to prepare the neutral gray double-silver Low-E glass, which can precisely control the thickness and composition of each film layer, thereby realizing the selective transmission and reflection of visible light by the glass, achieving a neutral gray tone effect, and this method is applicable to the uniform film layer deposition on a large-area glass substrate, ensuring the consistency of the performance of the glass product; the film layer obtained by vacuum sputtering has a firm bond with the glass substrate, ensuring that the glass has good durability and abrasion resistance.

[0023] Preferably, the preparation method includes the following steps:

[0024] (1) Obtain a glass substrate and perform a cleaning treatment on the glass substrate;

[0025] (2) Use a vacuum magnetron sputtering method to sequentially deposit a first dielectric layer, a first AZO layer, a first Ag layer, a first NiCr layer, a second AZO layer, a second dielectric layer, a third AZO layer, a second Ag layer, a second NiCr layer, a fourth AZO layer, a third dielectric layer, and a protective layer on one surface of the glass substrate obtained in step (1);

[0026] (3) Cut and grind the glass obtained in step (2) in sequence to obtain the neutral gray double-silver Low-E coated glass.

[0027] Preferably, the cleaning treatment in step (1) includes cleaning and drying performed in sequence.

[0028] Preferably, the cleaning solution used for cleaning includes deionized water and / or ethanol.

[0029] Preferably, the temperature of the drying is ≤60 °C.

[0030] Preferably, the vacuum magnetron sputtering method in step (2) uses a double-rotating cathode and / or a planar cathode for film layer deposition, and the thickness and refractive index of the film layer are monitored in real time during the film layer deposition process.

[0031] Preferably, the sputtering vacuum degree of the vacuum magnetron sputtering method in step (2) is 10 -4 -10 -3 Pa.

[0032] Preferably, the cutting and edge grinding in step (3) are carried out by automatic control.

[0033] Preferably, after the cutting and edge grinding in step (3), quality inspection is also carried out, and the quality inspection includes appearance inspection and optical performance detection.

[0034] In a third aspect, the present invention provides an application of the neutral gray dual-silver Low-E coated glass as described in the first aspect, and the neutral gray dual-silver Low-E coated glass is used in the field of building facades or new energy vehicles.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] (1) The present invention optimizes the structural design of the coating layer group. In the direction away from the glass substrate, dielectric layers are respectively arranged at the bottom layer, the intermediate layer and the top layer, a NiCr layer is arranged on the top of the Ag layer, AZO layers are respectively arranged on both sides, and a protective layer is arranged at the topmost layer. This film layer layout achieves specific optical performance indicators, including visible light transmittance, visible light transmitted color, visible light reflectance on the glass surface, etc., realizes a true neutral gray tone effect, and at the same time enhances the adhesion between different film layers, plays a good role in preventing Na ion diffusion and protecting the Ag layer, and the obtained coated glass has excellent antioxidant performance, meets the requirements of being processable and tempered in different places, improves the processing flexibility of the product, can meet the urgent needs of the market for high-performance and multifunctional building glass materials, and is conducive to large-scale popularization and application.

[0037] (2) The present invention uses the vacuum magnetron sputtering method to prepare the neutral gray dual-silver Low-E glass, and can precisely control the thickness and composition of each film layer, thereby realizing the selective transmission and reflection of visible light by the glass, achieving a neutral gray tone effect, and this method is suitable for the uniform film layer deposition on a large-area glass substrate, ensuring the consistency of the performance of the glass product; the film layer obtained by vacuum sputtering is firmly bonded to the glass substrate, ensuring that the glass has good durability and abrasion resistance. Description of the Drawings

[0038] Figure 1 is a schematic structural diagram of the neutral gray dual-silver Low-E coated glass provided by the present invention.

[0039] Wherein: 10 - glass substrate; 21 - first dielectric layer; 22 - second dielectric layer; 23 - third dielectric layer; 31 - first AZO layer; 32 - second AZO layer; 33 - third AZO layer; 34 - fourth AZO layer; 41 - first Ag layer; 42 - second Ag layer; 51 - first NiCr layer; 52 - second NiCr layer; 60 - protective layer. Detailed Embodiments

[0040] The technical solution of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0041] As Figure 1 shown, an embodiment of the present invention provides a neutral gray double-silver Low-E coated glass, which includes a glass substrate 10 and a coating layer group disposed on one surface of the glass substrate 10. In the direction away from the glass substrate 10, the coating layer group includes a first dielectric layer 21, a first AZO layer 31, a first Ag layer 41, a first NiCr layer 51, a second AZO layer 32, a second dielectric layer 22, a third AZO layer 33, a second Ag layer 42, a second NiCr layer 52, a fourth AZO layer 34, a third dielectric layer 23, and a protective layer 60 that are stacked.

[0042] The present invention optimizes the structural design of the coating layer group. In the direction away from the glass substrate 10, dielectric layers (the first dielectric layer 21, the second dielectric layer 22, and the third dielectric layer 23) are respectively disposed at the bottom layer, the middle layer, and the top layer, NiCr layers (the first NiCr layer 51 and the second NiCr layer 52) are disposed on the top of the Ag layers (the first Ag layer 41 and the second Ag layer 42), AZO layers (the first AZO layer 31, the second AZO layer 32, the third AZO layer 33, and the fourth AZO layer 34) are respectively disposed on both sides, and a protective layer 60 is disposed at the topmost layer. This film layer layout achieves specific optical performance indicators, including visible light transmittance, visible light transmission color, and visible light glass surface reflectance, etc., realizes a true neutral gray tone effect, and at the same time enhances the adhesion between different film layers, plays a good role in preventing Na ion diffusion and protecting the Ag layer, and the obtained coated glass has excellent antioxidant performance, meets the requirements of being processable and tempered in different places, improves the processing flexibility of the product, can meet the urgent needs of the market for high-performance and multi-functional building glass materials, and is conducive to large-scale popularization and application.

[0043] In some embodiments, the first dielectric layer 21, the second dielectric layer 22, and the third dielectric layer 23 are respectively independently SiN x layers.

[0044] The present invention defines the three dielectric layers as SiN x layers respectively because SiN x has good transparency and a low refractive index, which helps to improve the visible light transmittance of the coated glass, thereby maintaining a good natural lighting condition. At the same time, SiN x has a high hardness and wear resistance, which helps to improve the wear resistance and durability of the coated glass, and enables its performance to remain stable during long-term use.

[0045] In some embodiments, the protective layer 60 is a ZrO2 layer.

[0046] In the present invention, the protective layer 60 is specifically defined as a ZrO2 layer because ZrO2 has extremely high chemical stability and can resist the erosion of various chemical substances, including acids, alkalis, and salts, etc. This is crucial for protecting the performance of the coated glass under various environmental conditions. At the same time, ZrO2 has high hardness and good wear resistance, and can effectively resist external physical wear, significantly extending the service life of the coated glass.

[0047] In some embodiments, the thicknesses of the first dielectric layer 21 and the third dielectric layer 23 are each independently 25 - 35 nm, for example, it can be 25 nm, 26 nm, 27 nm, 28 nm, 29 nm, 30 nm, 31 nm, 32 nm, 33 nm, 34 nm, or 35 nm. The thickness of the second dielectric layer 22 is 65 - 75 nm, for example, it can be 65 nm, 66 nm, 67 nm, 68 nm, 69 nm, 70 nm, 71 nm, 72 nm, 73 nm, 74 nm, or 75 nm. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0048] In the present invention, the thickness of the dielectric layer directly affects the optical properties of the coated glass, including visible light transmittance, reflectance, and transmitted color, etc. By precisely controlling the thickness range of each dielectric layer, the above-mentioned optical properties can be optimized to meet specific design requirements, such as a neutral gray tone effect.

[0049] In addition, an appropriate thickness of the dielectric layer can enhance the mechanical strength and durability of the film layer, reduce the film layer peeling or damage caused by external physical damage, thereby extending the service life of the coated glass.

[0050] In some embodiments, the thicknesses of the first AZO layer 31, the second AZO layer 32, the third AZO layer 33, and the fourth AZO layer 34 are each independently 8 - 12 nm, for example, it can be 8 nm, 8.5 nm, 9 nm, 9.5 nm, 10 nm, 10.5 nm, 11 nm, 11.5 nm, or 12 nm. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0051] In the present invention, the thickness of the AZO layer also affects the color and gloss of the coated glass. The thickness range of 8 - 12 nm helps to control the color performance of the glass, achieve the effect of a neutral gray tone, and at the same time maintain the consistency and aesthetics of the appearance.

[0052] In addition, an appropriate thickness of the AZO layer can reduce the interference effect of light between the film layers, thereby optimizing the optical properties of the coated glass, such as reducing glare and improving visual comfort.

[0053] In some embodiments, the thickness of the first Ag layer 41 is 7 - 10 nm, for example, it can be 7 nm, 7.5 nm, 8 nm, 8.5 nm, 9 nm, 9.5 nm or 10 nm, and the thickness of the second Ag layer 42 is 8 - 12 nm, for example, it can be 8 nm, 8.5 nm, 9 nm, 9.5 nm, 10 nm, 10.5 nm, 11 nm, 11.5 nm or 12 nm. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0054] In the present invention, the Ag layer is a key component in Low - E coated glass because it has extremely high infrared reflectivity. By precisely controlling the thickness range of the Ag layer, infrared radiation can be maximally reflected, thereby improving the heat insulation performance of the glass.

[0055] In addition, the thickness of the Ag layer directly affects the visible light transmittance. The thickness ranges of 7 - 10 nm and 8 - 12 nm help to achieve good heat insulation effects while maintaining a relatively high visible light transmittance, which is particularly important for architectural glass to ensure natural lighting and indoor comfort.

[0056] In some embodiments, the thicknesses of the first NiCr layer 51 and the second NiCr layer 52 are independently 0.5 - 2 nm, for example, it can be 0.5 nm, 0.6 nm, 0.7 nm, 0.8 nm, 0.9 nm, 1 nm, 1.1 nm, 1.2 nm, 1.3 nm, 1.4 nm, 1.5 nm, 1.6 nm, 1.7 nm, 1.8 nm, 1.9 nm or 2 nm. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0057] In the present invention, an appropriate thickness of the NiCr layer helps to enhance the stability of the entire film structure. Especially when the NiCr layer is disposed on top of the Ag layer, it can improve the adhesion between the film layers and reduce the peeling or damage of the film layers caused by external physical damage.

[0058] In addition, the NiCr layer can prevent the oxidation and sulfidation of the Ag layer, extending the service life of the coated glass. The thickness range of 0.5 - 2 nm is sufficient to provide effective protection without having a negative impact on the optical properties.

[0059] In some embodiments, the thickness of the protective layer 60 is 1 - 5 nm, for example, it can be 1 nm, 1.5 nm, 2 nm, 2.5 nm, 3 nm, 3.5 nm, 4 nm, 4.5 nm or 5 nm. However, it is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0060] In some embodiments, the glass substrate 10 is float glass.

[0061] In the present invention, the float glass was invented by Pilkington of the UK in 1959 and is the mainstream flat glass in the world at present. Using the float glass as the substrate in the present invention can ensure that the coated glass has excellent physical and optical properties and meet the requirements of high-performance building glass materials.

[0062] In some embodiments, the thickness of the glass substrate 10 is 5 - 15 mm, for example, it can be 5 nm, 6 nm, 7 nm, 8 nm, 9 nm, 10 nm, 11 nm, 12 nm, 13 nm, 14 nm or 15 nm, but is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0063] An embodiment of the present invention provides a method for preparing the above-mentioned neutral gray double-silver Low-E coated glass. The preparation method includes: depositing a coating layer group on one side surface of the glass substrate 10 by using the vacuum magnetron sputtering method according to the set coating sequence to obtain the neutral gray double-silver Low-E coated glass.

[0064] The present invention uses the vacuum magnetron sputtering method to prepare the neutral gray double-silver Low-E glass, which can precisely control the thickness and composition of each film layer, thereby realizing the selective transmission and reflection of visible light by the glass, achieving the neutral gray tone effect, and this method is applicable to the uniform film layer deposition on a large-area glass substrate 10, ensuring the consistency of the performance of the glass product; the film layer obtained by vacuum sputtering is firmly combined with the glass substrate 10, ensuring that the glass has good durability and abrasion resistance.

[0065] In some embodiments, the preparation method includes the following steps:

[0066] (1) Obtain the glass substrate 10 and perform a cleaning treatment on the glass substrate 10;

[0067] (2) Use the vacuum magnetron sputtering method to sequentially deposit a first dielectric layer 21, a first AZO layer 31, a first Ag layer 41, a first NiCr layer 51, a second AZO layer 32, a second dielectric layer 22, a third AZO layer 33, a second Ag layer 42, a second NiCr layer 52, a fourth AZO layer 34, a third dielectric layer 23 and a protective layer 60 on one side surface of the glass substrate 10 obtained in step (1);

[0068] (3) Cut and grind the glass obtained in step (2) in sequence to obtain the neutral gray double-silver Low-E coated glass.

[0069] In some embodiments, the cleaning treatment in step (1) includes washing and drying in sequence.

[0070] In some embodiments, the cleaning solution used for cleaning includes deionized water and / or ethanol.

[0071] In some embodiments, the temperature of drying is ≤ 60 °C. For example, it can be 20 °C, 25 °C, 30 °C, 35 °C, 40 °C, 45 °C, 50 °C, 55 °C or 60 °C, but is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0072] In some embodiments, in step (2), the vacuum magnetron sputtering method uses a dual-rotating cathode and / or a planar cathode for film deposition, and the thickness and refractive index of the film are monitored in real time during the film deposition process.

[0073] In some embodiments, the sputtering vacuum degree of the vacuum magnetron sputtering method in step (2) is 10 -4 -10 -3 Pa. For example, it can be 10 -4 Pa, 2×10 -4 Pa, 3×10 -4 Pa, 4×10 -4 Pa, 5×10 -4 Pa, 6×10 -4 Pa, 7×10 -4 Pa, 8×10 - 4 Pa, 9×10 -4 Pa, or 10 -3 Pa, but is not limited to the listed values, and other unlisted values within this numerical range are equally applicable.

[0074] In some embodiments, in step (3), the cutting and edge grinding are carried out by automatic control.

[0075] In some embodiments, after the cutting and edge grinding in step (3), quality inspection is also carried out, and the quality inspection includes appearance inspection and optical property detection.

[0076] In the present invention, the appearance inspection includes checking whether there are film defects, scratches, spots, etc. on the glass surface, and the optical property detection includes measuring optical property indexes such as the light transmittance, reflectance, and color of the glass by using a professional optical detection instrument.

[0077] An embodiment of the present invention provides an application of the above-mentioned neutral gray double-silver Low-E coated glass, and the neutral gray double-silver Low-E coated glass is used in the field of building exterior walls or new energy vehicles.

[0078] The numerical ranges described in the present invention include not only the above-listed point values, but also any point values between the above numerical ranges that are not listed. Due to space limitations and for the sake of brevity, the present invention does not exhaustively list the specific point values included in the said range.

[0079] Example 1

[0080] This example provides a neutral gray double-silver Low-E coated glass and its preparation method. As Figure 1 shown, it includes a glass substrate 10 and a coating layer group disposed on one side surface of the glass substrate 10. In the direction away from the glass substrate 10, the coating layer group includes a first dielectric layer 21, a first AZO layer 31, a first Ag layer 41, a first NiCr layer 51, a second AZO layer 32, a second dielectric layer 22, a third AZO layer 33, a second Ag layer 42, a second NiCr layer 52, a fourth AZO layer 34, a third dielectric layer 23, and a protective layer 60 which are stacked.

[0081] Among them, the first dielectric layer 21, the second dielectric layer 22, and the third dielectric layer 23 are each independently a SiN x layer; the protective layer 60 is a ZrO2 layer; the glass substrate 10 is a float glass.

[0082] Specifically, the thicknesses of the first dielectric layer 21 and the third dielectric layer 23 are each independently 30 nm, the thickness of the second dielectric layer 22 is 70 nm; the thicknesses of the first AZO layer 31, the second AZO layer 32, the third AZO layer 33, and the fourth AZO layer 34 are each independently 10 nm; the thickness of the first Ag layer 41 is 8 nm, the thickness of the second Ag layer 42 is 10 nm; the thicknesses of the first NiCr layer 51 and the second NiCr layer 52 are each independently 1.2 nm; the thickness of the protective layer 60 is 3 nm; the thickness of the glass substrate 10 is 10 mm.

[0083] In this example, the preparation method of the above neutral gray double-silver Low-E coated glass includes the following steps:

[0084] (1) Obtain the glass substrate 10, clean the glass substrate 10 with deionized water, and dry it at 60 °C;

[0085] (2) By using the vacuum magnetron sputtering method, a first dielectric layer 21, a first AZO layer 31, a first Ag layer 41, a first NiCr layer 51, a second AZO layer 32, a second dielectric layer 22, a third AZO layer 33, a second Ag layer 42, a second NiCr layer 52, a fourth AZO layer 34, a third dielectric layer 23, and a protective layer 60 are sequentially deposited on one side surface of the glass substrate 10 obtained in step (1). The vacuum magnetron sputtering method uses a dual-rotating cathode and a planar cathode for film deposition, and the thickness and refractive index of the film are monitored in real time during the film deposition process. The sputtering vacuum degree is 5×10 -4 Pa;

[0086] (3) The glass obtained in step (2) is sequentially cut and edged, and after appearance inspection and optical property detection, neutral gray double-silver Low-E coated glass is obtained by using automatic control.

[0087] Example 2

[0088] This example provides a neutral gray double-silver Low-E coated glass and its preparation method. As Figure 1 shown, it includes a glass substrate 10 and a coating layer group provided on one side surface of the glass substrate 10. In the direction away from the glass substrate 10, the coating layer group includes a first dielectric layer 21, a first AZO layer 31, a first Ag layer 41, a first NiCr layer 51, a second AZO layer 32, a second dielectric layer 22, a third AZO layer 33, a second Ag layer 42, a second NiCr layer 52, a fourth AZO layer 34, a third dielectric layer 23, and a protective layer 60 which are stacked.

[0089] Among them, the first dielectric layer 21, the second dielectric layer 22, and the third dielectric layer 23 are independently SiN x layers; the protective layer 60 is a ZrO2 layer; the glass substrate 10 is float glass.

[0090] Specifically, the thicknesses of the first dielectric layer 21 and the third dielectric layer 23 are independently 25 nm, the thickness of the second dielectric layer 22 is 75 nm; the thicknesses of the first AZO layer 31, the second AZO layer 32, the third AZO layer 33, and the fourth AZO layer 34 are independently 8 nm; the thickness of the first Ag layer 41 is 10 nm, the thickness of the second Ag layer 42 is 8 nm; the thicknesses of the first NiCr layer 51 and the second NiCr layer 52 are independently 0.5 nm; the thickness of the protective layer 60 is 5 nm; the thickness of the glass substrate 10 is 15 mm.

[0091] In this example, the preparation method of the above neutral gray double-silver Low-E coated glass includes the following steps:

[0092] (1) Obtain a glass substrate 10, clean the glass substrate 10 with ethanol, and dry it at 50 °C;

[0093] (2) Use the vacuum magnetron sputtering method to sequentially deposit a first dielectric layer 21, a first AZO layer 31, a first Ag layer 41, a first NiCr layer 51, a second AZO layer 32, a second dielectric layer 22, a third AZO layer 33, a second Ag layer 42, a second NiCr layer 52, a fourth AZO layer 34, a third dielectric layer 23, and a protective layer 60 on one side surface of the glass substrate 10 obtained in step (1). And the vacuum magnetron sputtering method uses a dual-rotating cathode and a planar cathode for film deposition, and the thickness and refractive index of the film are monitored in real time during the film deposition process. The sputtering vacuum degree is 10 -4 Pa;

[0094] (3) Use automated control to cut and edge the glass obtained in step (2) in sequence, and obtain neutral gray double-silver Low-E coated glass after appearance inspection and optical performance detection.

[0095] Example 3

[0096] This example provides a neutral gray double-silver Low-E coated glass and its preparation method. As Figure 1 shown, it includes a glass substrate 10 and a coating layer group provided on one side surface of the glass substrate 10. In the direction away from the glass substrate 10, the coating layer group includes a first dielectric layer 21, a first AZO layer 31, a first Ag layer 41, a first NiCr layer 51, a second AZO layer 32, a second dielectric layer 22, a third AZO layer 33, a second Ag layer 42, a second NiCr layer 52, a fourth AZO layer 34, a third dielectric layer 23, and a protective layer 60 which are stacked.

[0097] Among them, the first dielectric layer 21, the second dielectric layer 22, and the third dielectric layer 23 are independently SiN x layers; the protective layer 60 is a ZrO2 layer; the glass substrate 10 is a float glass.

[0098] Specifically, the thicknesses of the first dielectric layer 21 and the third dielectric layer 23 are independently 35 nm, the thickness of the second dielectric layer 22 is 65 nm; the thicknesses of the first AZO layer 31, the second AZO layer 32, the third AZO layer 33, and the fourth AZO layer 34 are independently 12 nm; the thickness of the first Ag layer 41 is 7 nm, the thickness of the second Ag layer 42 is 12 nm; the thicknesses of the first NiCr layer 51 and the second NiCr layer 52 are independently 2 nm; the thickness of the protective layer 60 is 1 nm; the thickness of the glass substrate 10 is 5 mm.

[0099] In this embodiment, the preparation method of the neutral gray double-silver Low-E coated glass includes the following steps:

[0100] (1) Obtain a glass substrate 10, clean the glass substrate 10 successively with ethanol and deionized water, and dry it at 40 °C;

[0101] (2) Use the vacuum magnetron sputtering method to sequentially deposit a first dielectric layer 21, a first AZO layer 31, a first Ag layer 41, a first NiCr layer 51, a second AZO layer 32, a second dielectric layer 22, a third AZO layer 33, a second Ag layer 42, a second NiCr layer 52, a fourth AZO layer 34, a third dielectric layer 23, and a protective layer 60 on one side surface of the glass substrate 10 obtained in step (1). The vacuum magnetron sputtering method uses a dual-rotating cathode and a planar cathode for film deposition, and the thickness and refractive index of the film are monitored in real time during the film deposition process. The sputtering vacuum degree is 10 -3 Pa;

[0102] (3) Use automatic control to cut and edge the glass obtained in step (2) in sequence. After appearance inspection and optical performance detection, the neutral gray double-silver Low-E coated glass is obtained.

[0103] Example 4

[0104] This embodiment provides a neutral gray double-silver Low-E coated glass and its preparation method. Except that the thickness of the second dielectric layer 22 is changed to 30 nm, that is, the thicknesses of the first dielectric layer 21, the second dielectric layer 22, and the third dielectric layer 23 are the same, the remaining structures and conditions are the same as those in Example 1, so they will not be elaborated here.

[0105] Example 5

[0106] This embodiment provides a neutral gray double-silver Low-E coated glass and its preparation method. Except that the thickness of the second Ag layer 42 is changed to 8 nm, that is, the thicknesses of the first Ag layer 41 and the second Ag layer 42 are the same, the remaining structures and conditions are the same as those in Example 1, so they will not be elaborated here.

[0107] Comparative Example 1

[0108] This comparative example provides a double-silver Low-E coated glass and its preparation method. Except for removing the first dielectric layer 21, the second dielectric layer 22, and the third dielectric layer 23, the remaining structures and conditions are the same as those in Example 1, so they will not be elaborated here.

[0109] Comparative Example 2

[0110] This comparative example provides a double-silver Low-E coated glass and its preparation method. Except for removing the first AZO layer 31, the second AZO layer 32, the third AZO layer 33, and the fourth AZO layer 34, the remaining structures and conditions are the same as those in Example 1, so they will not be elaborated here.

[0111] Comparative Example 3

[0112] This comparative example provides a double-silver Low-E coated glass and its preparation method. Except for removing the first NiCr layer 51 and the second NiCr layer 52, the remaining structures and conditions are the same as those in Example 1, so they will not be elaborated here.

[0113] After testing, the performance parameters of the double-silver Low-E coated glasses obtained in Examples 1-5 and Comparative Examples 1-3 are shown in Table 1 below.

[0114] Table 1

[0115]

[0116] In the above table, at*, bt*, aout*, and bout* are professional technical parameters used to describe the color characteristics of the glass, and they all belong to the chromaticity coordinates in the CIE 1931 color space. Specifically, at* and aout* represent the coordinates on the Yellow-Blue axis of the color. A positive value indicates a yellow tone, and a negative value indicates a blue tone; bt* and bout* represent the coordinates on the Red-Green axis of the color. A positive value indicates a red tone, and a negative value indicates a green tone.

[0117] It can be seen that the present invention optimizes the structural design of the coating layer group. In the direction away from the glass substrate, dielectric layers are respectively arranged at the bottom layer, the middle layer, and the top layer, a NiCr layer is arranged on the top of the Ag layer, AZO layers are respectively arranged on both sides, and a protective layer is arranged at the topmost layer. This film layer layout achieves specific optical performance indicators, including visible light transmittance, visible light transmitted color, and visible light glass surface reflectance, etc., realizes a true neutral gray tone effect, enhances the adhesion between different film layers at the same time, plays a good role in preventing Na ion diffusion and protecting the Ag layer, and the obtained coated glass has excellent antioxidant performance, meets the requirements of being processable and tempered in different places, improves the processing flexibility of the product, can meet the urgent needs of the market for high-performance and multifunctional building glass materials, and is conducive to large-scale popularization and application.

[0118] In addition, the neutral gray double-silver Low-E glass of the present invention is prepared by vacuum magnetron sputtering method, which can precisely control the thickness and composition of each film layer, thereby realizing the selective transmission and reflection of visible light by the glass, achieving a neutral gray tone effect, and this method is applicable to the uniform film deposition on large-area glass substrates, ensuring the consistency of the performance of glass products; the film layer obtained by vacuum sputtering is firmly bonded to the glass substrate, ensuring that the glass has good durability and abrasion resistance.

[0119] The applicant declares that the above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the public scope of the present invention.

Claims

1. A neutral gray double-silver Low-E coated glass, comprising a glass substrate and a coating layer group disposed on one surface of the glass substrate, characterized in that, In a direction away from the glass substrate, the coating layer group includes a first dielectric layer, a first AZO layer, a first Ag layer, a first NiCr layer, a second AZO layer, a second dielectric layer, a third AZO layer, a second Ag layer, a second NiCr layer, a fourth AZO layer, a third dielectric layer, and a protective layer which are stacked.

2. The neutral gray double-silver Low-E coated glass according to claim 1, characterized in that, The first dielectric layer, the second dielectric layer, and the third dielectric layer are each independently SiN x layer; And / or, the protective layer is a ZrO2 layer.

3. The neutral gray double-silver Low-E coated glass according to claim 1, wherein The thicknesses of the first dielectric layer and the third dielectric layer are independently 25 - 35 nm respectively, and the thickness of the second dielectric layer is 65 - 75 nm; And / or, the thicknesses of the first AZO layer, the second AZO layer, the third AZO layer, and the fourth AZO layer are independently 8 - 12 nm respectively; And / or, the thickness of the first Ag layer is 7 - 10 nm, and the thickness of the second Ag layer is 8 - 12 nm; And / or, the thicknesses of the first NiCr layer and the second NiCr layer are independently 0.5 - 2 nm respectively; And / or, the thickness of the protective layer is 1 - 5 nm.

4. The neutral gray double-silver Low-E coated glass according to any one of claims 1-3, characterized in that, The glass substrate is float glass; And / or, the thickness of the glass substrate is 5 - 15 mm.

5. A method for preparing a neutral gray double-silver Low-E coated glass according to any one of claims 1-4, characterized in that, The preparation method includes: according to the set coating sequence, using the vacuum magnetron sputtering method to deposit the coating layer group on one side surface of the glass substrate to obtain neutral gray double - silver Low - E coated glass.

6. The preparation method of the neutral gray double-silver Low-E coated glass according to claim 5, characterized in that, The preparation method includes the following steps: (1) Obtain a glass substrate and perform a cleaning treatment on the glass substrate; (2) Use the vacuum magnetron sputtering method to sequentially deposit a first dielectric layer, a first AZO layer, a first Ag layer, a first NiCr layer, a second AZO layer, a second dielectric layer, a third AZO layer, a second Ag layer, a second NiCr layer, a fourth AZO layer, a third dielectric layer, and a protective layer on one side surface of the glass substrate obtained in step (1); (3) Cut and edge - grind the glass obtained in step (2) to obtain neutral gray double - silver Low - E coated glass.

7. The preparation method of the neutral gray double-silver Low-E coated glass according to claim 6, characterized in that, The cleaning treatment in step (1) includes cleaning and drying in sequence; And / or, the cleaning solution used for cleaning includes deionized water and / or ethanol; And / or, the drying temperature ≤ 60 °C.

8. The preparation method of the neutral gray double-silver Low-E coated glass according to claim 6, characterized in that, In step (2), the vacuum magnetron sputtering method uses a dual - rotating cathode and / or a planar cathode for film layer deposition, and the thickness and refractive index of the film layer are monitored in real time during the film layer deposition process; and / or, the sputtering vacuum degree of the vacuum magnetron sputtering method described in step (2) is 10 -4 -10 -3 Pa.

9. The preparation method of the neutral gray double-silver Low-E coated glass according to claim 6, characterized in that, The cutting and edge - grinding in step (3) are carried out by automatic control; And / or, quality inspection is also carried out after the cutting and edge - grinding in step (3), and the quality inspection includes appearance inspection and optical property inspection.

10. Use of the neutral gray double-silver Low-E coated glass according to any one of claims 1-4, characterized in that, The neutral gray double - silver Low - E coated glass is used in the field of building facades or new energy vehicles.

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