Highly reflective glaze layer having composite structure and manufacturing method therefor, back sheet glass, and photovoltaic module

Abstract

Provided are a highly reflective glaze layer having a composite structure and a manufacturing method therefor, a back sheet glass, and a photovoltaic module. Said highly reflective glaze layer is provided on a glass substrate (3), and comprises a surface layer (1) and a reflective layer (2), the surface layer (1) covering the surface and side surfaces of the reflective layer (2), and the tail end of the surface layer (1) being in contact with the surface of the glass substrate (3). The surface layer (1) is a high-temperature bonding-phase accumulation layer, and the reflective layer (2) is a white filler accumulation layer. Said highly reflective glaze layer has a dense surface and a significantly layered structure, and thus can form multi-gradient reflection and has excellent reflection ability, so that gap light can be more fully recovered and utilized. In addition, the glaze layer further exhibits greatly improved water vapor insulation and electrical insulation properties and passes both a 96-hour PCT and a 192-hour PID test.

Description

High-reflective glaze layer with composite structure, manufacturing method thereof, backplane glass and photovoltaic module

[0001] Related applications

[0002] The present application claims priority to the Chinese patent application No. 202411168929.5 filed on August 23, 2024, and incorporates by reference the entire disclosure of the above patent application as part of the present application. TECHNICAL FIELD

[0003] The present disclosure relates to a high-reflective glaze layer with composite structure, a manufacturing method thereof, a backplane glass and a photovoltaic module, and belongs to the technical field of photovoltaic modules. BACKGROUND

[0004] In order to recycle light, the white reflective glaze layer is commonly used on the surface of the backplane grid glass. The white reflective glaze layer is formed by printing glass ink on the surface of the glass and then being tempered. However, the reflective rate and the light energy utilization rate of the glaze layer are low, which affects the glass load and reduces the glass strength. Specifically, the reflective rate of the glaze layer is about 75%, and the utilization rate of light is not high. All the reflected light is diffuse reflection, that is, the glaze layer recycles light in the form of diffuse reflection, and the proportion of the reflected light that really returns to the surface of the cell is not high, so the gain of the module is limited. At the same time, the glass is tempered at the sintering temperature of the glaze layer, which affects the strength of the tempered glass. Moreover, the performance of the glaze cannot match the performance of the glass, which causes the micro-cracks on the surface of the glass to expand seriously, thereby seriously reducing the strength of the backplane glass. In other words, due to the defects of the glaze layer structure, such as non-dense and non-matching expansion, the glaze layer has a narrow tempering process window, poor aging resistance, and seriously affects the strength of the glass.

[0005] The utilization rate of light determines the power generation efficiency of the photovoltaic solar module. At present, there are inevitable gaps between the cells and the strings of most photovoltaic solar modules, and the area of the gaps accounts for 7%-15% of the whole module. Therefore, it is particularly important to efficiently recycle the part of the projected light.

[0006] Under the demand for continuous weight reduction of photovoltaic modules, it is inevitable for the backplane glass to become larger and thinner. The performance of most white glaze layers on 2.0mm glass backplane cannot meet the requirements of the load of the module factory. With the continuous thinning of the glass, the influence of such glaze layer on the glass load will also increase.

[0007] Therefore, it is urgent to provide a new high-reflective glaze layer with composite structure, a manufacturing method thereof, a backplane glass and a photovoltaic module. SUMMARY

[0008] To solve the above-mentioned shortcomings and deficiencies, the purpose of the present disclosure is to provide a high-reflective glaze layer with a composite structure, a manufacturing method thereof, a backplane glass and a photovoltaic module. The high-reflective glaze layer provided by the present disclosure has a composite layer structure, so that it can realize mixed reflection (diffuse reflection and directional reflection) of multiple gradients and multiple dimensions. When it is arranged on the surface of the substrate glass, the obtained backplane glass can more reasonably and fully recycle the gap light, has a very high light recycling rate, and at the same time can maximize the guarantee that the load of the glass is not affected.

[0009] To achieve the above purpose, in one aspect, the present disclosure provides a high-reflective glaze layer with a composite structure arranged on a substrate glass, wherein the high-reflective glaze layer with the composite structure comprises a surface layer and a reflective layer, the surface layer covers the surface and side surface of the reflective layer, and the end of the surface layer is in contact with the surface of the substrate glass.

[0010] Among them, the surface layer is a high-temperature bonding phase accumulation layer, and the reflective layer is a white filler accumulation layer.

[0011] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, the surface layer further comprises white fillers, and the white fillers are uniformly distributed in the high-temperature bonding phase accumulation layer. The white fillers in the surface layer are mixed into the surface layer from the reflective layer when the high-reflective glaze layer is prepared, or are added in the surface layer when the high-reflective glaze layer is prepared.

[0012] In the above high-reflective glaze layer of the present disclosure, the surface layer comprises a high-temperature bonding phase and white fillers, wherein the high-temperature bonding phase is accumulated to form a high-whiteness layer structure, and the white fillers are distributed / filled between the layer structures. The surface layer is a dense structure, which can protect the reflective layer structure from water vapor erosion to the greatest extent, and at the same time provide optimal water vapor insulation properties, thereby playing a role in protecting the reflective layer. In addition to diffuse reflection, the dense and smooth dense glaze layer on the surface of the surface layer can also provide partial directional reflected light under specific angle of incidence, so that the high-reflective glaze layer can improve the recycling rate of light through mixed reflection (diffuse reflection plus directional reflection).

[0013] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, the white fillers comprise titanium dioxide and the like, and the content of TiO2 in the surface layer is ≤50% based on 100% of the total weight of the surface layer, and can be selected as 25-45%.

[0014] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, the whiteness L value of the surface layer is ≥98.5.

[0015] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, the D97 of the high-temperature bonding phase in the surface layer is ≤8μm.

[0016] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, wherein the white filler in the reflective layer comprises at least one of titanium dioxide, barium sulfate, silica microspheres, porcelain powder, etc., and the content of the white filler in the reflective layer is ≥40% based on the total weight of the reflective layer, which can be optionally 40-60%. When the white filler in the reflective layer is titanium dioxide, the content of the white filler in the reflective layer can be calculated based on the content of TiO2.

[0017] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, wherein the whiteness L value of the reflective layer is ≥98.5.

[0018] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, wherein the D97 of the white filler in the reflective layer is less than 10 μm.

[0019] In the above high-reflective glaze layer of the present disclosure, the reflective layer is mainly used to provide basic reflectivity and is mainly in the form of diffuse reflection, which can more efficiently scatter and reflect the light not recycled by the surface layer for recycling. Such a structural design makes the light reflection and recycling more sufficient and has a gradient. In addition to diffuse reflection, there is also a certain directional reflected light. Compared with the surface layer, the material in the reflective layer is obviously loose.

[0020] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, wherein the thickness of the surface layer accounts for 1 / 4-1 / 2 of the total thickness of the high-reflective glaze layer, and the thickness of the reflective layer accounts for 1 / 2-3 / 4 of the total thickness of the high-reflective glaze layer.

[0021] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, wherein the thickness of the surface layer is 5-20 μm, and the thickness of the reflective layer is 8-25 μm.

[0022] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, wherein the thickness of the high-reflective glaze layer with the composite structure is 18-30 μm.

[0023] As a specific embodiment of the above high-reflective glaze layer of the present disclosure, wherein there is a clear boundary between the reflective layer and the surface layer and between the reflective layer and the surface of the substrate glass.

[0024] On the other hand, the present disclosure also provides a method for manufacturing the above high-reflective glaze layer with the composite structure, wherein the manufacturing method comprises:

[0025] Step (1): uniformly mixing a high-temperature binding phase and a first ink solvent to obtain a first slurry;

[0026] Step (2): uniformly mixing a white filler and a second ink solvent to obtain a second slurry;

[0027] Step (3): coating the second slurry and the first slurry on the substrate glass in sequence, and then forming the high-reflective glaze layer with the composite structure on the substrate glass after the furnace tempering.

[0028] The first ink and the second ink used in steps (1) and (2) of the above production method of the present disclosure are both conventional substances, which can be reasonably selected as needed; and the first ink and the second ink can be the same or different, and can be selected to be the same.

[0029] As a specific embodiment of the above production method of the present disclosure, the coating includes printing, roller coating, or spraying, etc. In some embodiments of the present disclosure, the printing includes silk printing, overprinting, etc.

[0030] As a specific embodiment of the above production method of the present disclosure, the temperature of the furnace tempering is 690-740℃, and the time is 90-115s.

[0031] The high-reflective glaze layer provided by the present disclosure has a composite layer structure, which is more reasonable in structure, so that the sintering window is wider, and in the process of furnace tempering, the tempering properties and tempering process of the glass itself are not affected.

[0032] In another aspect, the present disclosure also provides a backplane glass comprising a substrate glass and a glaze layer arranged on the surface thereof, wherein the glaze layer is the above high-reflective glaze layer with the composite structure.

[0033] In still another aspect, the present disclosure also provides a photovoltaic module, wherein the photovoltaic module comprises the above backplane glass.

[0034] As a specific embodiment of the above photovoltaic module of the present disclosure, the photovoltaic module is a double-glass photovoltaic solar module.

[0035] Compared with the prior art, the present disclosure can achieve the following beneficial technical effects:

[0036] The high-reflective glaze layer with the composite structure provided by the present disclosure comprises a reflective layer and a surface layer, the surface layer covers the surface and the side surface of the reflective layer, and the end of the surface layer is in contact with the surface of the substrate glass; wherein the surface layer comprises a high-temperature bonding phase, and the reflective layer comprises a white filler.

[0037] Firstly, the high-reflective glaze layer with the composite structure has a clear / obvious layered structure and each layer plays a different role. The surface layer is a dense high-temperature binder accumulation layer, which can improve the recycling rate of light through mixed reflection (a combination of diffuse reflection and directional reflection); and the structure of the surface layer is dense, which can protect the reflective layer structure from water vapor erosion to the greatest extent and provide optimal water vapor insulation properties; and the reflective layer is a high-whiteness white filler accumulation layer, which can further recycle light. Such a structure design makes the reflection and recycling of light more sufficient and has a gradient, in addition to diffuse reflection, there is also a certain directional reflected light. That is, the present disclosure reasonably designs the layer structure of the high-reflective glaze layer, so that the glaze layer has multi-gradient and multi-dimensional mixed reflection (diffuse reflection and directional reflection), thereby more reasonably and sufficiently recycling the gap light.

[0038] Secondly, in addition to more sufficient recycling of light energy, the design of the composite structure in the high-reflective glaze layer greatly reduces the existence of independent pores and through pores in the entire glaze layer, making the glaze layer structure more dense, more stable and reliable, avoiding water vapor intrusion during the later storage and testing process, and the water vapor insulation and electrical insulation performance of the glaze layer is also better improved and the performance is maintained more durable, making the weather resistance test of the assembly under long-term use more reliable.

[0039] Thirdly, in the contact area between the high-reflective glaze layer and the substrate glass, most of the contact areas are mainly non-erosive contact with the reflective layer, and a small part of the contact areas are continuous and dense contact with the surface layer. This structure design reduces the area of the continuous and dense contact points between the glaze layer and the substrate glass, thereby reducing the influence of the erosion of the glaze layer on the substrate glass and the difference in physical properties of the two materials on the load of the substrate glass to the greatest extent, providing a more reliable and safer glaze solution for larger and thinner photovoltaic glass. After the high-reflective glaze layer with the composite structure provided by the present disclosure is arranged on the surface of the substrate glass, the load of the substrate glass is almost not affected, and the falling ball impact height is close to that of the bare glass.

[0040] In addition, in addition to more sufficient recycling of light energy, the backplane glass with the high-reflective glaze layer with the composite structure on the surface has a very high light recycling rate, the overall reflection curve in the full waveband (380-1200nm) is lifted, and the maximum reflection interval (480-980nm) is also more consistent with the spectral response waveband of the photovoltaic cell, that is, the highest reflection point is shifted to 480-980nm, which is more consistent with the best response waveband of the cell.

[0041] In summary, the high-reflection glaze layer with the composite structure provided by the present disclosure has a dense surface and a clear layered structure, can form multi-gradient reflection, has excellent reflection capacity, and thus can more fully recycle the gap light; meanwhile, the water vapor insulation and electrical insulation performance of the glaze layer are greatly improved, and the PCT 96-hour test and the PID 192-hour test are passed. In addition, the load of the backplane glass provided with the high-reflection glaze layer with the composite structure is almost not affected, the ball drop height at an arbitrary position of the blank area of the silk screen surface is the same as that of the bare chip, and the ball drop impact height at the cross intersection of the non-silk screen surface is close to that of the bare chip glass. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0043] FIG. 1 is a structural schematic diagram of the backplane glass provided by Embodiment 1 of the present disclosure.

[0044] FIG. 2a is a local scanning electron microscope image of the middle position of the backplane glass provided by Embodiment 1 of the present disclosure.

[0045] FIG. 2b is a local scanning electron microscope image of the middle position of the backplane glass provided by Comparative Example 1 of the present disclosure.

[0046] FIG. 3 is a structural schematic diagram of the backplane glass provided by Comparative Example 1 of the present disclosure.

[0047] FIG. 4 is a reflectivity curve of the backplane glass provided by Embodiment 1, Comparative Example 1 and Comparative Example 2 obtained in Test Example 2 of the present disclosure.

[0048] Main drawing number explanation: 1, surface layer; 2, reflection layer; 3, base material glass; 4, white glaze layer. DETAILED DESCRIPTION

[0049] It should be noted that the terms "comprising" and any variation thereof in the specification and claims of the present disclosure and the above drawings are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0050] The ranges disclosed herein are meant to include any and all sub-ranges unless otherwise indicated. For example, a range of "1 to 10" is intended to include any and all sub-ranges between (and including) the recited minimum and maximum values, i.e. 1-10, 2-9, 3-8, 4-7, 5-6, etc.

[0051] In the present disclosure, unless otherwise stated, a numerical range "a-b" indicates a shorthand way of describing all real combinations comprising any real number between (and including) "a" and "b", where "a" and "b" are both real numbers. For example, the numerical range "0-5" indicates that all real numbers between (and including) "0" and "5" have been listed in the present disclosure, and "0-5" is just a shorthand way of describing these numerical combinations.

[0052] In the present disclosure, all embodiments mentioned in the present disclosure and optional embodiments can be combined with each other to form new technical solutions, if not specifically stated.

[0053] In the present disclosure, all technical features mentioned in the present disclosure and optional features can be combined with each other to form new technical solutions, if not specifically stated.

[0054] In the present disclosure, all steps mentioned herein can be performed in sequence or randomly, but optionally in sequence, if not specifically stated. For example, a method comprises steps (a) and (b) indicates that the method can comprise steps (a) and (b) performed in sequence, or steps (b) and (a) performed in sequence. For example, it is mentioned that the method further comprises step (c) indicates that step (c) can be added to the method in any order, for example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0055] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in combination with the drawings and examples. The following described examples are part of the examples of the present disclosure, rather than all the examples, and are only used to illustrate the present disclosure, and should not be regarded as limiting the scope of the present disclosure. Based on the examples in the present disclosure, all other examples obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure. If the specific conditions are not specified in the examples, the conventional conditions or the conditions recommended by the manufacturer are used. If the reagents or instruments used are not specified by the manufacturer, they are all conventional products that can be purchased on the market.

[0056] The "thickness" in the present disclosure is the "average thickness".

[0057] Example 1

[0058] The present example provides a backplane glass, the structural schematic diagram of which is shown in FIG. 1. As can be seen from FIG. 1, it comprises a substrate glass 3 and a high-reflective glaze layer with a composite structure provided on the surface of the substrate glass 3, which comprises a reflective layer 2 and a surface layer 1. The surface layer 1 covers the surface and side surface of the reflective layer 2, and the end of the surface layer 1 is in contact with the surface of the substrate glass 3. There is a clear boundary between the surface layer 1 and the reflective layer 2, and between the reflective layer 2 and the substrate glass 3.

[0059] The surface layer 1 is a high-temperature bonding phase (i.e. glass powder) accumulation layer, which forms a dense high-whiteness reflective layer and mainly plays a role in protecting the entire multi-layer structure. The thickness of the surface layer 1 is 8 μm, accounting for 1 / 3 of the total thickness of the high-reflective glaze layer. The surface layer contains titanium white powder, which is uniformly distributed in the high-temperature bonding phase accumulation layer. The content of TiO2 in the surface layer is 45% based on the total weight of the surface layer being 100%.

[0060] The reflective layer 2 is a white filler accumulation layer. Compared with the surface layer 1, the material accumulation of the reflective layer 2 is obviously loose, which is mainly used to provide basic reflectivity and mainly in the form of diffuse reflection. The thickness of the reflective layer 2 is 16 μm, accounting for 2 / 3 of the total thickness of the high-reflective glaze layer. The reflective layer contains titanium white powder and glass powder. The content of TiO2 in the reflective layer is 50% based on the total weight of the reflective layer being 100%.

[0061] The substrate glass is a float ultra-white glass, and the thickness thereof is 2.0 mm.

[0062] In order to more fully introduce the backplane glass, the present example further provides a method for manufacturing the same, which comprises:

[0063] Step (1): uniformly mixing titanium white powder, glass powder and a first ink adjusting agent (a conventional ink adjusting agent available on the market) to obtain a first slurry;

[0064] Step (2): mixing titanium dioxide, glass powder and second ink vehicle (commercially available conventional ink vehicle) uniformly to obtain a second slurry;

[0065] Step (3): forming a grid on the surface of the substrate glass by screen printing (a kind of composite printing process, in which ink is transferred to the substrate through a screen, the unblocked holes on the screen allow the ink to pass through to form a pattern, and another layer of ink is superimposed on the printed layer to form a composite structure) using the second slurry and the first slurry, and then forming a high-reflective glaze layer with a composite structure on the substrate glass by furnace tempering at 690-740℃ for 90-115s.

[0066] Example 2

[0067] The backplane glass of the present embodiment is different from that of Example 1 only in that the substrate glass is an embossed ultra-white glass.

[0068] Example 3

[0069] The backplane glass of the present embodiment comprises a substrate glass and a high-reflective glaze layer with a composite structure disposed on the surface of the substrate glass, the high-reflective glaze layer with a composite structure comprises a reflective layer and a surface layer, the surface layer covers the surface and side surface of the reflective layer and the end of the surface layer is in contact with the surface of the substrate glass, and there is a clear boundary between the surface layer and the reflective layer and between the reflective layer and the substrate glass;

[0070] The surface layer is a high-temperature bonding phase (i.e. glass powder) accumulation layer, which forms a dense high-whiteness reflective layer and mainly serves to protect the entire multi-layer structure, the thickness of the surface layer is 12μm, accounting for 1 / 2 of the total thickness of the high-reflective glaze layer, the surface layer contains titanium dioxide, and the content of TiO2 in the surface layer is 45% based on the total weight of the surface layer;

[0071] The reflective layer is a white filler accumulation layer, which is obviously loose compared to the surface layer, mainly used to provide basic reflectivity and mainly in the form of diffuse reflection, the thickness of the reflective layer is 12μm, accounting for 1 / 2 of the total thickness of the high-reflective glaze layer, the reflective layer contains titanium dioxide and glass powder, and the content of TiO2 in the reflective layer is 50% based on the total weight of the reflective layer;

[0072] The substrate glass is a float ultra-white glass, and the thickness of the substrate glass is 2.0mm.

[0073] In order to more fully introduce the backplane glass, the present embodiment also provides a method for manufacturing the same, comprising:

[0074] Step (1): mixing titanium dioxide, glass powder and first ink vehicle (commercially available conventional ink vehicle) uniformly to obtain a first slurry;

[0075] Step (2): mixing titanium dioxide, glass powder and second ink oil (commercially available conventional ink oil) uniformly to obtain a second slurry;

[0076] Step (3): forming a grid on the surface of the substrate glass by screen printing the second slurry and the first slurry, and then forming a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740°C for 90-115s.

[0077] Example 4

[0078] The backplane glass provided in the present example comprises a substrate glass and a high-reflective glaze layer with a composite structure disposed on the surface of the substrate glass, the high-reflective glaze layer with a composite structure comprises a reflective layer and a surface layer, the surface layer covers the surface and side surface of the reflective layer, the end of the surface layer is in contact with the surface of the substrate glass, and there is a clear boundary between the surface layer and the reflective layer and between the reflective layer and the substrate glass;

[0079] The surface layer is a high-temperature bonding phase (i.e. glass powder) accumulation layer, which forms a dense high-whiteness reflective layer and mainly serves to protect the entire multi-layer structure, the thickness of the surface layer is 6μm, accounting for 1 / 4 of the total thickness of the high-reflective glaze layer, the surface layer contains titanium dioxide, the content of TiO2 in the surface layer is 45% based on the total weight of the surface layer;

[0080] The reflective layer is a white filler accumulation layer, which is obviously loose compared to the surface layer, mainly used to provide basic reflectivity and mainly in the form of diffuse reflection, the thickness of the reflective layer is 18μm, accounting for 3 / 4 of the total thickness of the high-reflective glaze layer, the reflective layer contains titanium dioxide and glass powder, the content of TiO2 in the reflective layer is 50% based on the total weight of the reflective layer;

[0081] The substrate glass is a float ultra-white glass, and the thickness thereof is 2.0mm.

[0082] In order to more fully introduce the backplane glass, the present example further provides a method for manufacturing the same, comprising:

[0083] Step (1): mixing titanium dioxide, glass powder and first ink oil (commercially available conventional ink oil) uniformly to obtain a first slurry;

[0084] Step (2): mixing titanium dioxide, glass powder and second ink oil (commercially available conventional ink oil) uniformly to obtain a second slurry;

[0085] Step (3): forming a grid on the surface of the substrate glass by screen printing the second slurry and the first slurry, and then forming a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740°C for 90-115s.

[0086] Embodiment 5

[0087] The embodiment provides a backplane glass, which comprises a substrate glass and a high-reflective glaze layer with a composite structure arranged on the surface of the substrate glass, the high-reflective glaze layer with the composite structure comprises a reflective layer and a surface layer, the surface layer covers the surface and the side surface of the reflective layer, the end of the surface layer is in contact with the surface of the substrate glass, and there is a clear boundary between the surface layer and the reflective layer and between the reflective layer and the substrate glass;

[0088] The surface layer is a high-temperature adhesive phase (i.e. glass powder) accumulation layer, forms a dense high-whiteness reflective layer, and mainly plays a role in protecting the whole multilayer structure, the thickness of the surface layer is 10 μm, the proportion of the total thickness of the high-reflective glaze layer is 1 / 3, the surface layer contains titanium white powder, the content of TiO2 in the surface layer is 45% based on 100% of the total weight of the surface layer;

[0089] The reflective layer is a white filler accumulation layer, the material accumulation of the reflective layer is obviously loose compared with the surface layer, mainly used for providing basic reflectivity, and mainly in the form of diffuse reflection, the thickness of the reflective layer is 20 μm, the proportion of the total thickness of the high-reflective glaze layer is 2 / 3, the reflective layer contains titanium white powder and glass powder, the content of TiO2 in the reflective layer is 50% based on 100% of the total weight of the reflective layer;

[0090] The substrate glass is a float ultra-white glass, and the thickness is 2.0 mm.

[0091] In order to more fully introduce the backplane glass, the embodiment further provides a manufacturing method thereof, which comprises the following steps:

[0092] Step (1): uniformly mixing titanium white powder, glass powder and a first ink oil (a conventional ink oil on the market) to obtain a first slurry;

[0093] Step (2): uniformly mixing titanium white powder, glass powder and a second ink oil (a conventional ink oil on the market) to obtain a second slurry;

[0094] Step (3): forming a grid on the surface of the substrate glass by screen printing the second slurry and the first slurry in a screen printing overprinting mode, and then forming the high-reflective glaze layer with the composite structure on the substrate glass after furnace tempering at 690-740 ℃ for 90-115 s.

[0095] Embodiment 6

[0096] The backplane glass provided by the embodiment comprises a substrate glass and a high-reflective glaze layer with a composite structure arranged on the surface of the substrate glass, the high-reflective glaze layer with the composite structure comprises a reflective layer and a surface layer, the surface layer covers the surface and the side surface of the reflective layer, the end of the surface layer is in contact with the surface of the substrate glass, and there is a clear boundary between the surface layer and the reflective layer and between the reflective layer and the substrate glass;

[0097] The surface layer is a high-temperature bonding phase (i.e. glass powder) accumulation layer, forms a dense high-whiteness reflective layer, and mainly plays a role in protecting the entire multi-layer structure, the thickness of the surface layer is 6 μm, the proportion of the total thickness of the high-reflective glaze layer is 1 / 3, the surface layer contains titanium white powder, and the content of TiO2 in the surface layer is 45% based on 100% of the total weight of the surface layer;

[0098] The reflective layer is a white filler accumulation layer, the material accumulation of the reflective layer is obviously loose compared with the surface layer, mainly used for providing basic reflectivity, and mainly in the form of diffuse reflection, the thickness of the reflective layer is 12 μm, the proportion of the total thickness of the high-reflective glaze layer is 2 / 3, the reflective layer contains titanium white powder and glass powder, and the content of TiO2 in the reflective layer is 50% based on 100% of the total weight of the reflective layer;

[0099] The substrate glass is a float ultra-white glass, and the thickness is 2.0 mm.

[0100] In order to more fully introduce the backplane glass, the embodiment further provides a manufacturing method thereof, comprising:

[0101] Step (1): uniformly mixing titanium white powder, glass powder and a first ink oil (a conventional ink oil on the market) to obtain a first slurry;

[0102] Step (2): uniformly mixing titanium white powder, glass powder and a second ink oil (a conventional ink oil on the market) to obtain a second slurry;

[0103] Step (3): forming a grid on the surface of the substrate glass by screen printing the second slurry and the first slurry in a screen printing overprinting manner, and then forming a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740 ℃ for 90-115 s.

[0104] Embodiment 7

[0105] The backplane glass provided by the embodiment comprises a substrate glass and a high-reflective glaze layer with a composite structure arranged on the surface of the substrate glass, the high-reflective glaze layer with the composite structure comprises a reflective layer and a surface layer, the surface layer covers the surface and the side surface of the reflective layer, the end of the surface layer is in contact with the surface of the substrate glass, and there is a clear boundary between the surface layer and the reflective layer and between the reflective layer and the substrate glass;

[0106] The surface layer is a high-temperature adhesive phase (i.e., glass powder) accumulation layer, forms a dense high-whiteness reflective layer, and mainly plays a role in protecting the entire multi-layer structure. The thickness of the surface layer is 13.3 μm, and the proportion of the total thickness of the high-reflective glaze layer is 1 / 3. The surface layer contains titanium white powder, which is uniformly distributed in the high-temperature adhesive phase accumulation layer. The content of TiO2 in the surface layer is 45% based on the total weight of the surface layer.

[0107] The reflective layer is a white filler accumulation layer. Compared with the surface layer, the material accumulation of the reflective layer is obviously loose, mainly used to provide basic reflectivity, and mainly in the form of diffuse reflection. The thickness of the reflective layer is 26.7 μm, and the proportion of the total thickness of the high-reflective glaze layer is 2 / 3. The reflective layer contains titanium white powder and glass powder. The content of TiO2 in the reflective layer is 50% based on the total weight of the reflective layer.

[0108] The substrate glass is a float ultra-white glass, and the thickness is 2.0 mm.

[0109] In order to more fully introduce the backplane glass, the manufacturing method thereof is also provided in the embodiment, which comprises:

[0110] Step (1): uniformly mixing titanium white powder, glass powder and first ink oil (commercially available conventional ink oil) to obtain a first slurry;

[0111] Step (2): uniformly mixing titanium white powder, glass powder and second ink oil (commercially available conventional ink oil) to obtain a second slurry;

[0112] Step (3): forming a grid on the surface of the substrate glass by screen printing the second slurry and the first slurry through screen printing overprinting, and then forming a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740 ℃ for 90-115 s.

[0113] Example 8

[0114] The embodiment provides a backplane glass, which comprises a substrate glass and a high-reflective glaze layer with a composite structure arranged on the surface of the substrate glass. The high-reflective glaze layer with a composite structure comprises a reflective layer and a surface layer. The surface layer covers the surface and side surface of the reflective layer, and the end of the surface layer is in contact with the surface of the substrate glass. There is a clear boundary between the surface layer and the reflective layer, and between the reflective layer and the substrate glass.

[0115] The surface layer is a high-temperature adhesive phase (i.e., glass powder) accumulation layer, forms a dense high-whiteness reflective layer, and mainly plays a role in protecting the entire multi-layer structure. The thickness of the surface layer is 4 μm, and the proportion of the total thickness of the high-reflective glaze layer is 1 / 3. The surface layer contains titanium white powder, which is uniformly distributed in the high-temperature adhesive phase accumulation layer. The content of TiO2 in the surface layer is 45% based on the total weight of the surface layer.

[0116] The reflective layer is a white filler accumulation layer, and the material accumulation of the reflective layer is obviously loose compared to the surface layer. The reflective layer is mainly used to provide basic reflectivity and is mainly in the form of diffuse reflection. The thickness of the reflective layer is 8 pm, and the proportion of the total thickness of the high-reflectivity glaze layer is 2 / 3. The reflective layer contains titanium white and glass powder. The content of TiO2 in the reflective layer is 50% based on the total weight of the reflective layer.

[0117] The base glass is a float ultra-white glass, and the thickness of the base glass is 2.0 mm.

[0118] In order to more fully introduce the backplane glass, the manufacturing method thereof is also provided in the embodiment, which comprises the following steps:

[0119] Step (1): uniformly mixing titanium white, glass powder and a first ink oil (a conventional ink oil on the market) to obtain a first slurry;

[0120] Step (2): uniformly mixing titanium white, glass powder and a second ink oil (a conventional ink oil on the market) to obtain a second slurry;

[0121] Step (3): forming a grid on the surface of the base glass by screen printing the second slurry and the first slurry in a screen printing overprinting manner, and then forming a high-reflectivity glaze layer with a composite structure on the base glass after furnace tempering at 690-740 ℃ for 90-115 s.

[0122] Embodiment 9

[0123] The embodiment provides a backplane glass, which comprises a base glass and a high-reflectivity glaze layer with a composite structure arranged on the surface of the base glass. The high-reflectivity glaze layer with the composite structure comprises a reflective layer and a surface layer. The surface layer covers the surface and the side surface of the reflective layer, and the end of the surface layer is in contact with the surface of the base glass. There is a clear boundary between the surface layer and the reflective layer, and between the reflective layer and the base glass.

[0124] The surface layer is a high-temperature bonding phase (i.e. glass powder) accumulation layer, which forms a dense high-whiteness reflective layer and mainly plays a role in protecting the entire multi-layer structure. The thickness of the surface layer is 8 pm, and the proportion of the total thickness of the high-reflectivity glaze layer is 1 / 3. The surface layer contains titanium white, which is uniformly distributed in the high-temperature bonding phase accumulation layer. The content of TiO2 in the surface layer is 45% based on the total weight of the surface layer.

[0125] The reflective layer is a white filler accumulation layer, and the material accumulation of the reflective layer is obviously loose compared to the surface layer. The reflective layer is mainly used to provide basic reflectivity and is mainly in the form of diffuse reflection. The thickness of the reflective layer is 16 pm, and the proportion of the total thickness of the high-reflectivity glaze layer is 2 / 3. The reflective layer contains titanium white and glass powder. The content of TiO2 in the reflective layer is 30% based on the total weight of the reflective layer.

[0126] The base glass is a float ultra-white glass, and the thickness is 2.0 mm.

[0127] In order to more fully introduce the backplane glass, the embodiment also provides a manufacturing method thereof, comprising:

[0128] Step (1): uniformly mixing titanium white powder, glass powder and first ink oil (commercially available conventional ink oil) to obtain first slurry;

[0129] Step (2): uniformly mixing titanium white powder, glass powder and second ink oil (commercially available conventional ink oil) to obtain second slurry;

[0130] Step (3): forming a grid on the surface of the base glass by screen printing the second slurry and the first slurry in a screen printing overprinting manner, and then forming a high-reflective glaze layer with a composite structure on the base glass after furnace tempering at 690-740 ℃ for 90-115 s.

[0131] Embodiment 10

[0132] The embodiment provides a backplane glass, which comprises a base glass and a high-reflective glaze layer with a composite structure arranged on the surface of the base glass, the high-reflective glaze layer with the composite structure comprises a reflection layer and a surface layer, the surface layer covers the surface and the side surface of the reflection layer, the end of the surface layer is in contact with the surface of the base glass, and there is a clear boundary between the surface layer and the reflection layer and between the reflection layer and the base glass;

[0133] The surface layer is a high-temperature bonding phase accumulation layer, forms a dense high-whiteness reflection layer, and mainly plays a role in protecting the entire multi-layer structure, the thickness of the surface layer is 8 μm, the proportion of the thickness of the surface layer in the total thickness of the high-reflective glaze layer is 1 / 3, the surface layer contains titanium white powder, the content of TiO2 in the surface layer is 55% based on 100% of the total weight of the surface layer;

[0134] The reflection layer is a white filler accumulation layer, the material accumulation of the reflection layer is obviously loose compared with the surface layer, the reflection layer is mainly used for providing basic reflectivity and mainly takes diffuse reflection as the main form, the thickness of the reflection layer is 16 μm, the proportion of the thickness of the reflection layer in the total thickness of the high-reflective glaze layer is 2 / 3, the reflection layer contains titanium white powder and glass powder, and the content of TiO2 in the reflection layer is 50% based on 100% of the total weight of the reflection layer;

[0135] The base glass is a float ultra-white glass, and the thickness is 2.0 mm.

[0136] In order to more fully introduce the backplane glass, the embodiment also provides a manufacturing method thereof, comprising:

[0137] Step (1): uniformly mixing titanium white powder, glass powder and first ink oil (commercially available conventional ink oil) to obtain first slurry;

[0138] Step (2): mixing titanium dioxide, glass powder and second ink oil (commercially available conventional ink oil) uniformly to obtain a second slurry;

[0139] Step (3): forming a grid on the surface of the substrate glass by screen printing the second slurry and the first slurry, and then forming a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740°C for 90-115s.

[0140] Example 11

[0141] The present embodiment provides a backplane glass, which comprises a substrate glass and a high-reflective glaze layer with a composite structure disposed on the surface of the substrate glass, the high-reflective glaze layer with a composite structure comprises a reflective layer and a surface layer, the surface layer covers the surface and side surface of the reflective layer, the end of the surface layer is in contact with the surface of the substrate glass, and there is a clear boundary between the surface layer and the reflective layer and between the reflective layer and the substrate glass;

[0142] The surface layer is a high-temperature binder phase accumulation layer, which forms a dense high-whiteness reflective layer and mainly serves to protect the entire multi-layer structure, the thickness of the surface layer is 8μm, and the proportion of the thickness of the surface layer in the total thickness of the high-reflective glaze layer is 1 / 3, the surface layer contains titanium dioxide, the content of TiO2 in the surface layer is 65% based on the total weight of the surface layer;

[0143] The reflective layer is a white filler accumulation layer, which is obviously loose compared with the surface layer, mainly serves to provide basic reflectivity, and mainly provides diffuse reflection, the thickness of the reflective layer is 16μm, and the proportion of the thickness of the reflective layer in the total thickness of the high-reflective glaze layer is 2 / 3, the reflective layer contains titanium dioxide and glass powder, the content of TiO2 in the reflective layer is 50% based on the total weight of the reflective layer;

[0144] The substrate glass is a float ultra-white glass, and the thickness of the substrate glass is 2.0mm.

[0145] In order to more fully introduce the backplane glass, the present embodiment further provides a manufacturing method thereof, which comprises:

[0146] Step (1): mixing glass powder and first ink oil (commercially available conventional ink oil) uniformly to obtain a first slurry;

[0147] Step (2): mixing titanium dioxide, glass powder and second ink oil (commercially available conventional ink oil) uniformly to obtain a second slurry;

[0148] Step (3): forming a grid on the surface of the substrate glass by screen printing the second slurry and the first slurry, and then forming a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740°C for 90-115s.

[0149] Example 12

[0150] The present example provides a backplane glass, which is distinguished from Example 1 only in that the surface layer of the high-reflective glaze layer having a composite structure does not contain titanium white.

[0151] Comparative Example 1

[0152] The present comparative example provides a backplane glass, the schematic diagram of the structure of which is shown in FIG. 3. As can be seen from FIG. 3, it comprises a substrate glass and a white glaze layer disposed on the surface of the substrate glass, which is formed by printing a glass ink once on the surface of the substrate glass with a printing thickness of 24 μm and then solidifying and tempering.

[0153] The substrate glass is a float ultra-white glass, and the thickness thereof is 2.0 mm.

[0154] Comparative Example 2

[0155] The present comparative example provides a backplane glass, the schematic diagram of the structure of which is shown in FIG. 3. As can be seen from FIG. 3, it comprises a substrate glass and a white glaze layer disposed on the surface of the substrate glass, which is formed by printing a glass ink once on the surface of the substrate glass with a printing thickness of 24 μm and then solidifying and tempering.

[0156] The substrate glass is an embossed ultra-white glass, and the thickness thereof is 2.0 mm.

[0157] Test Example 1

[0158] The present test example respectively performs local electron microscope scanning on the middle position of the backplane glass provided by Example 1 of the present disclosure and the backplane glass provided by Comparative Example 1. The scanning electron microscope graph of the backplane glass of Example 1 is shown in FIG. 2a, and the scanning electron microscope graph of the backplane glass of Comparative Example 1 is shown in FIG. 2b. As can be seen by comparing FIG. 2a and FIG. 2b, in the backplane glass provided by Example 1, the high-reflective glaze layer having a composite structure is disposed on the surface of the substrate glass, and the surface layer and the reflection layer in the high-reflective glaze layer having a composite structure, and the reflection layer and the substrate glass all have clear interfaces, and the base layer contains titanium white and glass phase, and the surface layer contains glass phase and titanium white uniformly distributed in the glass phase.

[0159] Test Example 2

[0160] The reflectivity test (a detection method for quantifying the ability of a material surface to reflect light), crosshatch test (a standardized method for evaluating the adhesion strength between a coating, plating or film and a substrate, using a special knife to draw a grid-shaped cut on the surface of the coating, and then peeling off the coating by tape or observing the coating falling off by eyes to judge the adhesion grade), pencil hardness test, 96-hour pressure cooker test (PCT) or PCT 96-hour test, 192-hour potential induced degradation (PID) test or PID 192-hour test, glass surface stress test, four-point bending test and impact height test were carried out on the backplane glasses provided by the embodiments 1-12 of the present disclosure and the comparative examples 1-2, wherein the reflectivity was tested by a spectrophotometer, and the test wavelength range was 380-1200 nm; the crosshatch test was carried out by using a crosshatch knife (composed of a group of blades with fixed blade spacing, which can cut a grid by cross-cutting); the pencil hardness test was carried out by using a pencil hardness tester; the PCT 96-hour test was carried out by using a high-pressure thermostat, and the test conditions were 121℃, 100% humidity, saturated steam pressure and continuous operation for 96 hours, and the test process observed whether there was any change in the glaze layer and whether the reflectivity attenuation was ≤2%; the PID 192-hour test was carried out by laminating and sealing the backplane glass with a glaze layer into an assembly, and the test conditions were temperature 85℃, relative humidity 85%, direct current, voltage setting 1500V and continuous operation for 192 hours, and the test process observed whether there was any color change in the glaze layer; the glass surface stress was tested by a surface stress tester; the four-point bending was tested by a four-point bending tester; the drop ball impact height (i.e. impact height test) was tested by using a plastic sleeve and a 227g steel ball, and the test was started from 0.6m, and the test value was the highest breaking height.

[0161] In the present test example, the reflectivity test, crosshatch test, pencil hardness test, PCT 96-hour test and PID 192-hour test results of the backplane glasses provided by the embodiments 1-12 of the present disclosure and the comparative examples 1-2 were shown in Table 1 and FIG. 4, respectively.

[0162] Table 1

[0163] In the present test example, the drop ball impact height test results of the backplane glasses provided by the embodiments 1-12 of the present disclosure and the comparative examples 1-2 were shown in Table 2.

[0164] Table 2

[0165] The reflectivity curve of the backplane glass provided by the embodiment 1 of the present disclosure, i.e., the float ultra-white glass with a thickness of 2.0 mm and a high-reflective glaze layer with a composite structure on the surface, is shown in FIG. 4. The reflectivity curve shown in FIG. 4 is relatively smooth, and the average reflectivity is above 89.6%. As can be seen from FIG. 4, on the float ultra-white glass, the reflectivity curve presents an optimal reflectivity in the wavelength range of 580-780 nm, and the average reflectivity in this wavelength range is above 89%, which is very suitable for the response range of the battery piece. The reflectivity in the wavelength range of 480-980 nm is above 88% in the whole range. According to the reflectivity curves of the backplane glasses of Comparative Example 1 and Comparative Example 2, on the float ultra-white glass, the reflectivity curve reaches the highest in the wavelength range of about 425-450 nm, and then the reflectivity gradually decreases with the increase of the wavelength. As can be known from the experimental data in Table 1 above, the backplane glass provided by the embodiment 1 has a mesh strength of 0 level and a pencil hardness of >6H. Through the PCT 96-hour test, the glaze layer has no obvious change. And under the PID 192-hour test, the glaze layer has no discoloration. As can be known from the experimental data in Table 2 above, for the backplane glass provided by the embodiment 1, the falling ball impact height is close to the bare piece (i.e., the original glass substrate without any coating or silk printing treatment), the blank area of the printing surface (i.e., the exposed glass area of the bare glass on the backplane glass without silk printing on the silk printing surface) is 1.8 m, the T-shaped part at the edge of the non-silk printing surface (i.e., the intersection area of the glaze lines at the edge of the non-silk printing surface glass, which looks like the letter "T") is 1.6 m, and the cross-shaped part in the middle (i.e., the cross-shaped center area of the glaze mesh pattern on the non-silk printing surface) is 1.4 m. The load of the glass itself is not greatly affected.

[0166] As can be known from the experimental data in Tables 1 and 2 above, the backplane glass provided by the embodiment 2 of the present disclosure, i.e., the embossed ultra-white glass with a thickness of 2.0 mm and a high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 92.3%, a mesh strength of 0 level, and a pencil hardness of >6H. Through the PCT 96-hour test, the glaze layer has no obvious change. And under the PID 192-hour test, the glaze layer has no discoloration.

[0167] The falling ball impact height is close to the bare piece, the blank area of the printing surface is 1.6 m, the T-shaped part at the edge of the non-silk printing surface is 1.4 m, and the cross-shaped part in the middle is 1.2 m. The load of the glass itself is not greatly affected.

[0168] As can be known from the experimental data in Tables 1 and 2 above, the backplane glass provided by the embodiment 3 of the present disclosure, i.e., the float ultra-white glass with a thickness of 2.0 mm and a high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 86.5%, a mesh strength of 0 level, and a pencil hardness of >6H. Through the PCT 96-hour test, the glaze layer has no obvious change. And under the PID 192-hour test, the glaze layer has no discoloration.

[0169] The drop ball impact height is close to the bare chip, the blank area of the printing surface is 1.8 m, the T-shaped part of the non-silk printing surface edge is 1.4 m, and the cross-shaped part in the middle is 1.2 m. The load of the glass itself is not greatly affected.

[0170] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the embodiment 4 of the present disclosure, i.e., the thickness of the 2.0 mm float ultra-white glass provided with the high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 90.2%, a grid strength of 0-1 level, and a pencil hardness of >4H; the glaze layer has no obvious change through the PCT 96-hour test; and the glaze layer has no discoloration under the PID 192-hour test;

[0171] The drop ball impact height is close to the bare chip, the blank area of the printing surface is 1.8 m, the T-shaped part of the non-silk printing surface edge is 1.4 m, and the cross-shaped part in the middle is 1.2 m. The load of the glass itself is not greatly affected.

[0172] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the embodiment 5 of the present disclosure, i.e., the thickness of the 2.0 mm float ultra-white glass provided with the high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 85.8%, a grid strength of 0 level, and a pencil hardness of >6H; the glaze layer has no obvious change through the PCT 96-hour test; and the glaze layer has no discoloration under the PID 192-hour test;

[0173] The drop ball impact height is close to the bare chip, the blank area of the printing surface is 1.4 m, the T-shaped part of the non-silk printing surface edge is 1.2 m, and the cross-shaped part in the middle is 1.0 m.

[0174] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the embodiment 6 of the present disclosure, i.e., the thickness of the 2.0 mm float ultra-white glass provided with the high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 88.8%, a grid strength of 1 level, and a pencil hardness of >6H; the glaze layer has no obvious change through the PCT 96-hour test; and the glaze layer has no discoloration under the PID 192-hour test;

[0175] The drop ball impact height is close to the bare chip, the blank area of the printing surface is 1.7 m, the T-shaped part of the non-silk printing surface edge is 1.5 m, and the cross-shaped part in the middle is 1.3 m.

[0176] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the embodiment 7 of the present disclosure, i.e., the thickness of the 2.0 mm float ultra-white glass provided with the high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 85.6%, a grid strength of 0 level, and a pencil hardness of >6H; the glaze layer has no obvious change through the PCT 96-hour test; and the glaze layer has no discoloration under the PID 192-hour test;

[0177] The drop ball impact height is close to the bare chip, the blank area of the printing surface is 1.2 m, the T-shaped part of the non-silk printing surface edge is 1.0 m, and the middle cross-shaped part is 0.9 m.

[0178] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the embodiment 8 of the present disclosure, that is, the float ultra-white glass with a thickness of 2.0 mm and provided with a high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 88.4%, a grid strength of 1 level, and a pencil hardness of > 4H; the glaze layer has no obvious change through the PCT 96-hour test; but the glaze layer is partially delaminated under the PID 192-hour test.

[0179] The drop ball impact height is close to the bare chip, the blank area of the printing surface is 1.8 m, the T-shaped part of the non-silk printing surface edge is 1.5 m, and the middle cross-shaped part is 1.4 m.

[0180] Compared with the embodiment 5 and the embodiment 6, the high-reflective glaze layer with a composite structure in the embodiment 7 of the present disclosure has a thickness that is too thick, although the performance of the glaze layer meets the requirements, but it does not meet the demand for thinning of the glaze layer, and the high-reflective glaze layer with a composite structure in the embodiment 8 has a thickness that is too thin, although the performance of the glaze layer barely meets the requirements, but its durability is slightly poor.

[0181] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the embodiment 9 of the present disclosure, that is, the float ultra-white glass with a thickness of 2.0 mm and provided with a high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 82.4%, a grid strength of 0 level, and a pencil hardness of > 6H; the glaze layer has no obvious change through the PCT 96-hour test; and the glaze layer has no discoloration under the PID 192-hour test.

[0182] The drop ball impact height is close to the bare chip, the blank area of the printing surface is 1.0 m, the T-shaped part of the non-silk printing surface edge is 0.9 m, and the middle cross-shaped part is 0.8 m.

[0183] Compared with the embodiment 1, the content of TiO2 in the high-reflective glaze layer with a composite structure provided by the embodiment 9 of the present disclosure is too low, only 30%, although the performance of the glaze layer basically meets the requirements, but its reflectivity is relatively low.

[0184] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the embodiment 10 of the present disclosure, that is, the float ultra-white glass with a thickness of 2.0 mm and provided with a high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 81.4%, a grid strength of 2 level, and a pencil hardness of > 3H; and cannot pass the PCT 96-hour test and the PID 192-hour test.

[0185] The drop ball impact height is close to the bare chip, the blank area of the printing surface is 1.4 m, the T-shaped part of the non-silk printing surface edge is 1.2 m, and the middle cross-shaped part is 0.9 m.

[0186] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the embodiment 11 of the present disclosure, i.e., the float ultra-white glass with a thickness of 2.0 mm and provided with a high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 82.2%, a grid strength of 4, and a pencil hardness of >2H; and cannot pass the PCT 96-hour test and the PID 192-hour test;

[0187] The ball drop impact height is close to the bare chip, the blank area of the printing surface is 1.5 m, the T-shaped part of the non-silk printing surface edge is 1.3 m, and the cross-shaped part in the middle is 1.0 m.

[0188] Compared with the embodiment 1, in the high-reflective glaze layer with a composite structure provided by the embodiments 10-11 of the present disclosure, the content of TiO2 in the surface layer is too high, so that the strength and other performances of the glaze layer are significantly reduced; and from the data of the glaze layers provided by the comparative embodiment 10 and the embodiment 11, it can be seen that with the increase of the content of TiO2 in the surface layer, the strength and other performances of the glaze layer are further reduced.

[0189] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the embodiment 12 of the present disclosure, i.e., the float ultra-white glass with a thickness of 2.0 mm and provided with a high-reflective glaze layer with a composite structure on the surface, has a reflectivity of 81.6%, a grid strength of 0, and a pencil hardness of >6H; the glaze layer has no obvious change through the PCT 96-hour test; and the glaze layer has no discoloration under the PID 192-hour test;

[0190] The ball drop impact height is close to the bare chip, the blank area of the printing surface is 1.8 m, the T-shaped part of the non-silk printing surface edge is 1.6 m, and the cross-shaped part in the middle is 1.4 m.

[0191] From the experimental results of the backplane glasses provided by the embodiments 1 and 12 of the present disclosure, it can be seen that when the surface layer of the high-reflective glaze layer with a composite structure of the backplane glass does not contain titanium white, the grid strength test, the pencil hardness test, the PCT 96-hour test, and the PID 192-hour test results of the backplane glass have no obvious change, but the reflectivity of the backplane glass is low, only 81.6%.

[0192] From the experimental data in Table 1 and Table 2 above, it can be seen that the backplane glass provided by the comparative example 1, i.e., the float ultra-white glass provided with a white glaze layer on the surface, has a reflectivity of 80%, a grid strength of 0-1, and a pencil hardness of >4H; the glaze layer is partially failed through the PCT 96-hour test; and the glaze layer appears partial delamination under the PID 192-hour test;

[0193] The ball drop impact height is: the blank area of the silk printing surface is 1.3 m, the T-shaped part of the non-silk printing surface edge is 1.0 m, and the cross-shaped part in the middle is 0.9 m.

[0194] From the experimental data in Table 1 and Table 2 above, it can be seen that the reflectivity of the backplane glass provided by Comparative Example 2, i.e. the embossed ultra-white glass with a white glaze layer on the surface, is 82%, the mesh intensity is 0-1 level, and the pencil hardness is >4H; through the PCT 96-hour test, the glaze layer appears local failure; and under the PID 192-hour test, the glaze layer appears local delamination;

[0195] Ball drop impact height: 1.2 m for the blank area of the screen printing surface, 0.9 m for the T-shaped part of the non-screen printing surface edge, and 0.8 m for the cross-shaped part in the middle.

[0196] From the above experimental results, it can be seen that the high-reflective glaze layer with a composite structure provided by the embodiments of the present disclosure has a dense surface and a clear layered structure, can form multi-gradient reflection, has excellent reflection ability, and can more fully recycle the gap light; at the same time, the water vapor insulation and electrical insulation performance of the glaze layer are also greatly improved. In addition, the load of the backplane glass provided with the high-reflective glaze layer with a composite structure is almost unaffected, the ball drop height at any position of the blank area of the screen printing surface is the same as that of the bare chip, and the ball drop impact height at the cross-shaped intersection of the non-screen printing surface is close to that of the bare chip glass.

[0197] The above is only a specific embodiment of the present disclosure, which cannot limit the scope of the invention. Therefore, the replacement of equivalent components or equivalent changes and modifications made within the scope of the present disclosure should still fall within the scope of the present patent. In addition, the technical features in the present disclosure can be freely combined with each other, between technical features, between technical features and technical inventions, and between technical inventions.

Claims

1. A high-reflectance enamel layer having a composite structure, which is provided on a base glass, characterized in that, The high-reflectance glaze layer with the composite structure comprises a surface layer and a reflective layer, the surface layer covers the surface and side surface of the reflective layer and the end of the surface layer is in contact with the surface of the substrate glass; The surface layer is a high-temperature binder accumulation layer and the reflective layer is a white filler accumulation layer.

2. The high reflective glaze layer of claim 1, wherein The surface layer further comprises white fillers which are uniformly distributed in the high-temperature binder accumulation layer.

3. The high reflective glaze layer of claim 2, wherein, The white fillers comprise titanium white, and the content of TiO2 in the surface layer is ≤50% and preferably 25-45% based on the total weight of the surface layer.

4. The high-reflectance glaze layer according to any one of claims 1 to 3, characterized in that The whiteness L value of the surface layer is ≥98.

5.

5. The high-reflectance glaze layer according to any one of claims 1 to 3, characterized in that The D97 of the high-temperature binder in the surface layer is ≤8 μm.

6. The high reflective glaze layer of claim 1, wherein The white fillers in the reflective layer comprise at least one of titanium white, barium sulfate, silica microspheres and porcelain powder, and the content of the white fillers in the reflective layer is ≥40% and preferably 40-60% based on the total weight of the reflective layer.

7. The high reflective glaze layer according to claim 1 or 6, wherein The whiteness L value of the reflective layer is ≥98.

5.

8. The high reflective glaze layer according to claim 1 or 6, wherein The D97 of the white fillers in the reflective layer is less than 10 μm.

9. The high-reflectance glaze layer according to any one of claims 1-3 and 6, characterized in that, The thickness of the surface layer accounts for 1 / 4-1 / 2 of the total thickness of the high-reflectance glaze layer, and the thickness of the reflective layer accounts for 1 / 2-3 / 4 of the total thickness of the high-reflectance glaze layer.

10. The high reflective glaze layer according to any one of claims 1-3 and 6, wherein The thickness of the surface layer is 5-20 μm and the thickness of the reflective layer is 8-25 μm.

11. The high reflective glaze layer according to any one of claims 1-3 and 6, wherein The thickness of the high-reflectance glaze layer with the composite structure is 18-30 μm.

12. The high reflective glaze layer according to any one of claims 1-3 and 6, wherein, There is a clear boundary between the reflective layer and the surface layer and between the reflective layer and the surface of the substrate glass.

13. The method of making a high reflective glaze layer having a composite structure according to any one of claims 1 to 12, characterized in that, The manufacturing method comprises: Step (1): uniformly mixing a high-temperature binder and a first ink solvent to obtain a first slurry; Step (2): uniformly mixing white fillers and a second ink solvent to obtain a second slurry; Step (3): sequentially coating the second slurry and the first slurry on the substrate glass to form a high-reflectance glaze layer with a composite structure on the substrate glass after in-furnace tempering.

14. The method of manufacturing according to claim 13, wherein, The coating comprises printing, roller coating or spraying.

15. The production method according to claim 13 or 14, characterized in that, The temperature of the in-furnace tempering is 690-740 ℃ and the time is 90-115 s.

16. A backplane glass comprising a base glass and an enamel layer disposed on a surface thereof, characterized in that, The glaze layer is the high-reflectance glaze layer with the composite structure according to any one of claims 1-12.

17. A photovoltaic module, characterized by, The photovoltaic module comprises the backsheet glass according to claim 16.

18. The photovoltaic module of claim 17, wherein, The photovoltaic module is a double-glass photovoltaic solar module.

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