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

Abstract

The application provides a high-reflection glaze layer with a composite structure, a manufacturing method of the high-reflection glaze layer, a backplane glass and a photovoltaic module. The high-reflection glaze layer with the composite structure is arranged on a base glass, and the high-reflection glaze layer with the composite structure comprises a surface layer and a reflection layer. The surface layer covers the surface and the side surface of the reflection layer, and the end of the surface layer is in contact with the surface of the base glass. The surface layer is a high-temperature bonding phase accumulation layer, and the reflection layer is a white filler accumulation layer. The high-reflection glaze layer with the composite structure has a dense surface and a clear layered structure, can form multi-gradient reflection, has excellent reflection capacity, and can more fully recycle and utilize 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.

Description

TECHNICAL FIELD

[0001] The present application relates to a high-reflective glaze layer with a composite structure, a manufacturing method thereof, a backplane glass and a photovoltaic module, and belongs to the technical field of photovoltaic modules. BACKGROUND

[0002] In order to recycle light, the market backplane grid glass surface glaze layer mostly uses white reflective glaze layer, which is formed by printing glass ink on the surface of glass once and then being tempered. The glaze layer has the disadvantages of low reflectivity / light energy utilization rate, affecting the glass load / reducing the glass strength. Specifically, the reflectivity of such glaze layer is concentrated at about 75%, the light utilization rate is not high, and all the reflected light is diffuse reflection. That is, the glaze layer recycles light in the form of diffuse reflection, and the proportion of reflected light that truly 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 often tempered in the process of sintering the glaze layer, which affects the strength of the glass itself, and the performance of the glaze cannot match the performance of the glass well, 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 expansion mismatch, the glaze layer has a narrow tempering process window, poor aging resistance, and seriously affects the strength of the glass.

[0003] The light utilization rate determines the power generation efficiency of photovoltaic solar modules. At present, the cell pieces and strings of most photovoltaic solar modules inevitably leave certain gaps, and the area of such gaps accounts for 7%-15% of the whole module. How to efficiently recycle this part of the projected light is particularly important.

[0004] 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 the 2.0mm glass backplane on the market cannot meet the requirements of the module manufacturers for the load, and with the continuous thinning of the glass, the influence of such glaze layer on the glass load will also increase.

[0005] Therefore, it has become a technical problem to be solved in the field to provide a new high-reflective glaze layer with a composite structure, a manufacturing method thereof, a backplane glass and a photovoltaic module. SUMMARY

[0006] In order to solve the above-mentioned shortcomings and deficiencies, the purpose of the present application 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 application has a composite layer structure, which can realize multi-gradient and multi-dimensional mixed reflection (diffuse reflection and directional reflection). When the high-reflective glaze layer 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 glass load is not affected.

[0007] To achieve the above object, in one aspect, the present application provides a high-reflective glaze layer with a composite structure, which is 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.

[0008] The surface layer is a high-temperature bonding phase accumulation layer, and the reflective layer is a white filler accumulation layer.

[0009] As a specific embodiment of the above high-reflective glaze layer, the surface layer further comprises white fillers, which 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 during preparation of the high-reflective glaze layer, or are added in the surface layer during preparation of the high-reflective glaze layer.

[0010] In the above high-reflective glaze layer, the surface layer comprises 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 provide optimal water vapor insulation properties, thereby playing a role of protecting the reflective layer. In addition to diffuse reflection on the surface of the surface layer, the dense and smooth dense glaze layer can also provide partially 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).

[0011] As a specific embodiment of the above high-reflective glaze layer, the white fillers comprise titanium dioxide and the like, and the content of TiO2 in the surface layer is ≤50% and preferably 25-45% based on 100% of the total weight of the surface layer.

[0012] As a specific embodiment of the above high-reflective glaze layer, the whiteness L value of the surface layer is ≥98.5.

[0013] As a specific embodiment of the above high-reflective glaze layer, the D97 of the high-temperature bonding phase in the surface layer is ≤8 μm.

[0014] As a specific embodiment of the above high-reflective glaze layer, the white fillers in the reflective layer comprise at least one of titanium dioxide, barium sulfate, silica microspheres, porcelain powder and the like, and the content of the white fillers in the reflective layer is ≥40% and preferably 40-60% based on 100% of the total weight of the reflective layer. When the white fillers in the reflective layer are titanium dioxide, the content of the white fillers in the reflective layer can be calculated based on the content of TiO2.

[0015] As a specific embodiment of the high-reflective glaze layer described above, the whiteness L value of the reflective layer is ≥98.5.

[0016] As a specific embodiment of the high-reflective glaze layer described above, the D97 of the white filler in the reflective layer is less than 10 μm.

[0017] In the high-reflective glaze layer described above, the reflective layer is mainly used to provide a basic reflectivity and is mainly in diffuse reflection, so that the light not recycled by the surface layer can be more efficiently scattered and reflected for recycling. Such a structure 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.

[0018] As a specific embodiment of the high-reflective glaze layer described above, 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.

[0019] As a specific embodiment of the high-reflective glaze layer described above, the thickness of the surface layer is 5-20 μm, and the thickness of the reflective layer is 8-25 μm.

[0020] As a specific embodiment of the high-reflective glaze layer described above, the thickness of the high-reflective glaze layer with a composite structure is 18-30 μm.

[0021] As a specific embodiment of the high-reflective glaze layer described above, 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.

[0022] On the other hand, the application also provides a method for manufacturing the high-reflective glaze layer with a composite structure described above, wherein the manufacturing method comprises:

[0023] Step (1): uniformly mix a high-temperature bonding phase and a first ink solvent to obtain a first slurry;

[0024] Step (2): uniformly mix a white filler and a second ink solvent to obtain a second slurry;

[0025] Step (3): sequentially coat the second slurry and the first slurry on a substrate glass, and then form a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering.

[0026] The first ink oil and the second ink oil used in the above-mentioned manufacturing method steps (1) and (2) are conventional substances, which can be reasonably selected according to needs; and the first ink oil and the second ink oil can be the same or different, and are preferably the same.

[0027] As a specific embodiment of the above-mentioned manufacturing method of the present application, the coating includes printing, roller coating or spraying, etc. In some embodiments of the present application, the printing includes silk printing, overprinting, etc.

[0028] As a specific embodiment of the above-mentioned manufacturing method of the present application, the temperature of the furnace steeling is 690-740℃, and the time is 90-115s.

[0029] The high-reflective glaze layer provided by the present application has a composite layer structure, the structure is more reasonable, the sintering window is wider, and in the furnace steeling process, the steeling properties and the steeling process of the glass itself are not affected.

[0030] In another aspect, the present application also provides a backplane glass, which comprises a substrate glass and a glaze layer arranged on the surface of the substrate glass, wherein the glaze layer is the high-reflective glaze layer with a composite structure as described above.

[0031] In another aspect, the present application also provides a photovoltaic module, wherein the photovoltaic module comprises the backplane glass as described above.

[0032] As a specific embodiment of the above-mentioned photovoltaic module of the present application, the photovoltaic module is a double-glass photovoltaic solar module.

[0033] Compared with the prior art, the present application can achieve the following beneficial technical effects:

[0034] The high-reflective glaze layer with a composite structure provided by the present application 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.

[0035] 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 application reasonably designs the layer structure of the high-reflective glaze layer, so that the glaze layer has multi-gradient, multi-dimensional mixed reflection (diffuse reflection and directional reflection), thereby more reasonably and sufficiently recycling the gap light.

[0036] 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 component under long-term use more reliable.

[0037] 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 application 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.

[0038] In addition, in addition to more sufficient recycling of light energy, the backplane glass provided with the high-reflective glaze layer with the composite structure on the surface has a very high light recycling rate, and the reflection curve of the full wave band (380-1200nm) is lifted as a whole, and the maximum reflection interval (480-980nm) is also more consistent with the spectral response band of the photovoltaic cell, that is, the highest reflection point is shifted to 480-980nm, which is more consistent with the best response band of the cell.

[0039] In summary, the high-reflection glaze layer with the composite structure provided by the application has a dense surface and a clear layered structure, can form multi-gradient reflection, has excellent reflection capacity, and thus can more fully recycle and utilize 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 silk printing surface is the same as that of the bare chip, and the ball drop impact height at the cross position of the non-silk printing surface is close to that of the bare chip glass. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0041] Figure 1 The structural schematic diagram of the backplane glass provided for the embodiment 1 of the present application is shown.

[0042] Figure 2a The local scanning electron microscope image of the middle position of the backplane glass provided for the embodiment 1 of the present application is shown.

[0043] Figure 2b The local scanning electron microscope image of the middle position of the backplane glass provided for the comparative example 1 is shown.

[0044] Figure 3 The structural schematic diagram of the backplane glass provided for the comparative example 1 is shown.

[0045] Figure 4 The reflectivity curve of the backplane glass provided for the embodiment 1 obtained in the test example 2 of the present application is shown.

[0046] Main drawing number explanation:

[0047] 1, surface layer;

[0048] 2, reflection layer;

[0049] 3, base material glass;

[0050] 4, white glaze layer. DETAILED DESCRIPTION

[0051] It has to be understood that the terms "comprising", "including", "containing", "characterized by" and any other variation thereof in the specification and in the claims are not to be construed as excluding any feature, step or element, but are meant to encompass the possibility of non-exclusive inclusion. Thus, the methods and compositions described herein can include, consist essentially of or consist of, any element or combination of elements described herein, in any order or arrangement.

[0052] The ranges disclosed herein are given in their absolute form. They can be one or more lower limits, and one or more upper limits. A given range is defined by selecting a lower limit and an upper limit. The selected lower and upper limits define the boundaries of a particular range. All ranges defined in this way are combinable, i.e. any lower limit can be combined with any upper limit to form a range. For example, where ranges of 60-120 and 80-110 are listed for a particular parameter, it is understood that ranges of 60-110 and 80-120 are also contemplated. Furthermore, if a minimum range value of 1 and 2 is listed, and a maximum range value of 3, 4 and 5 is listed, then the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4 and 2-5.

[0053] In the present application, unless otherwise stated, the numerical range "a-b" indicates a shorthand way of describing the inclusion of any integer or combination of integers between the lower integer "a" and the upper integer "b", where "a" and "b" are both integers. For example, the numerical range "0-5" indicates that all integers between "0-5" have been listed in the present application, and "0-5" is just a shorthand way of describing these numerical combinations.

[0054] In the present application, unless otherwise stated, all embodiments mentioned in the present application and preferred embodiments can be combined with each other to form new technical solutions.

[0055] In the present application, unless otherwise stated, all technical features mentioned in the present application and preferred features can be combined with each other to form new technical solutions.

[0056] In the present application, unless otherwise stated, all steps mentioned herein can be performed in sequence or randomly, but preferably in sequence. For example, the method comprises steps (a) and (b) indicates that the method can comprise steps (a) and (b) in sequence, or steps (b) and (a) in sequence. For example, 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.

[0057] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and examples. The examples described below are part of the examples of the present application, but not all the examples, and are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. 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.

[0058] The "thickness" in the present application is "average thickness".

[0059] Example 1

[0060] The present example provides a backplane glass, a schematic structural diagram of which is shown in Figure 1 As can be seen from Figure 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, and 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.

[0061] The surface layer 1 is a high-temperature bonding phase (i.e. glass powder) accumulation layer, forming a dense high-whiteness reflective layer, mainly serving to protect 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, and the surface layer contains titanium white powder, the content of TiO2 in the surface layer is 45% based on the total weight of the surface layer being 100%;

[0062] The reflective layer 2 is a white filler accumulation layer, which is obviously loose compared to the surface layer 1, 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, and 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%;

[0063] The substrate glass is a float ultra-white glass, and the thickness thereof is 2.0 mm.

[0064] In order to more fully introduce the backplane glass, the present example further provides a manufacturing method thereof, which comprises:

[0065] Step (1): mixing titanium white powder, glass powder and first ink oil (commercially available conventional ink oil) uniformly to obtain a first slurry;

[0066] Step (2): mixing titanium white powder, glass powder and second ink oil (commercially available conventional ink oil) uniformly to obtain a second slurry;

[0067] Step (3): forming a grid on the surface of the substrate glass by screen printing the second slurry and the first slurry in a superposition manner, 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.

[0068] Example 2

[0069] The backplane glass of the present example is different from that of Example 1 only in that the substrate glass is an embossed ultra-white glass.

[0070] Example 3

[0071] The backplane glass of 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 comprising a reflective layer and a surface layer, the surface layer covering the surface and side surface of the reflective layer and the terminal end of the surface layer being in contact with the surface of the substrate glass, and there being a clear boundary between the surface layer and the reflective layer and between the reflective layer and the substrate glass;

[0072] The surface layer is a high-temperature adhesive phase (i.e. glass powder) accumulation layer, forming a dense high-whiteness reflective layer and mainly serving to protect the entire multi-layer structure, the thickness of the surface layer being 12 μm and accounting for 1 / 2 of the total thickness of the high-reflective glaze layer, the surface layer containing titanium white powder, the content of TiO2 in the surface layer being 45% based on the total weight of the surface layer;

[0073] The reflective layer is a white filler accumulation layer, the material accumulation of the reflective layer being obviously loose compared to the surface layer, the reflective layer mainly serving to provide basic reflectivity and mainly being a diffuse reflector, the thickness of the reflective layer being 12 μm and accounting for 1 / 2 of the total thickness of the high-reflective glaze layer, the reflective layer containing titanium white powder and glass powder, the content of TiO2 in the reflective layer being 50% based on the total weight of the reflective layer;

[0074] The substrate glass is a float ultra-white glass, and the thickness of the substrate glass is 2.0 mm.

[0075] In order to more fully introduce the backplane glass, the present example also provides a method for manufacturing the same, comprising:

[0076] Step (1): mixing titanium white powder, glass powder and first ink oil (commercially available conventional ink oil) uniformly to obtain a first slurry;

[0077] Step (2): mixing titanium dioxide, glass powder and second ink oil (commercially available conventional ink oil) uniformly to obtain a second slurry;

[0078] 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 annealing at 690-740°C for 90-115s.

[0079] Example 4

[0080] 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 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;

[0081] The surface layer is a high-temperature adhesive 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, and the proportion of the surface layer in the total thickness of the high-reflective glaze layer is 1 / 4, 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;

[0082] The reflective layer is a white filler accumulation layer, which is obviously loose compared to the surface layer, mainly serves to provide basic reflectivity, and mainly provides diffuse reflection, the thickness of the reflective layer is 18μm, and the proportion of the reflective layer in the total thickness of the high-reflective glaze layer is 3 / 4, 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;

[0083] The substrate glass is a float ultra-white glass, and the thickness of the substrate glass is 2.0mm.

[0084] In order to more fully introduce the backplane glass, the present embodiment further provides a manufacturing method thereof, which comprises:

[0085] Step (1): mixing titanium dioxide, glass powder and first ink oil (commercially available conventional ink oil) uniformly to obtain a first slurry;

[0086] Step (2): mixing titanium dioxide, glass powder and second ink oil (commercially available conventional ink oil) uniformly to obtain a second slurry;

[0087] 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 overprint manner, and then forming a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740℃ for 90-115s.

[0088] Example 5

[0089] The backplane glass provided in 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.

[0090] The surface layer is a high-temperature adhesive phase (i.e. glass powder) accumulation layer, forming a dense high-whiteness reflective layer, mainly serving to protect the entire multi-layer structure, the thickness of the surface layer is 10μm, accounting for 1 / 3 of the total thickness of the high-reflective glaze layer, the surface layer contains titanium white powder, the content of TiO2 in the surface layer is 45% based on the total weight of the surface layer;

[0091] The reflective layer is a white filler accumulation layer, the material accumulation of the reflective layer is obviously loose compared to the surface layer, mainly serving to provide basic reflectivity and mainly in the form of diffuse reflection, the thickness of the reflective layer is 20μm, 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;

[0092] The substrate glass is a float ultra-white glass, and the thickness of the substrate glass is 2.0mm.

[0093] In order to more fully introduce the backplane glass, the present embodiment further provides a method for manufacturing the same, comprising:

[0094] Step (1): mixing titanium white powder, glass powder and a first ink mixing oil (a conventional ink mixing oil on the market) uniformly to obtain a first slurry;

[0095] Step (2): mixing titanium white powder, glass powder and a second ink mixing oil (a conventional ink mixing oil on the market) uniformly to obtain a second slurry;

[0096] 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 overprint manner, and then forming a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740℃ for 90-115s.

[0097] Example 6

[0098] 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 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;

[0099] The surface layer is a high-temperature adhesive phase (i.e. glass powder) accumulation layer, forms a dense high-whiteness reflective layer, mainly plays a role of protecting the whole 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, the content of TiO2 in the surface layer is 45% based on the total weight of the surface layer;

[0100] The reflective layer is a white filler accumulation layer, the material accumulation of the reflective layer is obviously loose compared with the surface layer, is mainly used for providing basic reflectivity and mainly takes 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, the content of TiO2 in the reflective layer is 50% based on the total weight of the reflective layer;

[0101] The substrate glass is a float ultra-white glass, and the thickness of the substrate glass is 2.0 mm.

[0102] In order to more fully introduce the backplane glass, the embodiment further provides a manufacturing method of the backplane glass, which comprises the following steps:

[0103] 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;

[0104] 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;

[0105] 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 a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740 ℃ for 90-115 s.

[0106] Embodiment 7

[0107] 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 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;

[0108] The surface layer is a high-temperature binder phase (i.e. glass powder) accumulation layer, forming a dense high-whiteness reflective layer, mainly serving to protect the entire multi-layer structure, the thickness of the surface layer is 13.3 μm, accounting for 1 / 3 of the total thickness of the high-reflective glaze layer, the surface layer contains titanium white powder, the content of TiO2 in the surface layer is 45% based on the total weight of the surface layer;

[0109] The reflective layer is a white filler accumulation layer, which is obviously loose compared to the surface layer, mainly serving to provide basic reflectivity, and mainly in the form of diffuse reflection, the thickness of the reflective layer is 26.7 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;

[0110] The substrate glass is a float ultra-white glass, and the thickness is 2.0 mm.

[0111] In order to more fully introduce the backplane glass, the manufacturing method thereof is also provided in this embodiment, which comprises:

[0112] 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;

[0113] 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;

[0114] 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 steel tempering at 690-740 ℃ for 90-115 s.

[0115] Example 8

[0116] The backplane glass provided in this 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 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;

[0117] The surface layer is a high-temperature binder phase (i.e., glass powder) accumulation layer, forming a dense high-whiteness reflective layer, mainly serving to protect the entire multi-layer structure, the thickness of the surface layer is 4 μm, accounting for 1 / 3 of the total thickness of the high-reflective glaze layer, the surface layer contains titanium white powder, the titanium white powder is uniformly distributed in the high-temperature binder phase accumulation layer, and the content of TiO2 in the surface layer is 45% based on the total weight of the surface layer being 100%;

[0118] 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 8 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, and the content of TiO2 in the reflective layer is 50% based on the total weight of the reflective layer being 100%;

[0119] The substrate glass is a float ultra-white glass, and the thickness is 2.0 mm.

[0120] In order to more fully introduce the backplane glass, the embodiment also provides a manufacturing method thereof, comprising:

[0121] 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;

[0122] 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;

[0123] 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.

[0124] Embodiment 9

[0125] 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 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;

[0126] The surface layer is a high-temperature binder phase (i.e., glass powder) accumulation layer, forming a dense high-whiteness reflective layer, mainly serving to protect the entire multi-layer structure, the thickness of the surface layer is 8 μm, accounting for 1 / 3 of the total thickness of the high-reflective glaze layer, the surface layer contains titanium white powder, the titanium white powder is uniformly distributed in the high-temperature binder phase accumulation layer, and the content of TiO2 in the surface layer is 45% based on the total weight of the surface layer being 100%;

[0127] 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 reflective layer in 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.

[0128] The substrate glass is a float ultra-white glass, and the thickness of the substrate glass is 2.0 mm.

[0129] In order to more fully introduce the backplane glass, the manufacturing method thereof is also provided in the embodiment, which comprises the following steps:

[0130] Step (1): uniformly mixing titanium white, glass powder and a first ink adjusting agent (a conventional ink adjusting agent on the market) to obtain a first slurry;

[0131] Step (2): uniformly mixing titanium white, glass powder and a second ink adjusting agent (a conventional ink adjusting agent on the market) to obtain a second slurry;

[0132] 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-reflectivity glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740 ℃ for 90-115 s.

[0133] Embodiment 10

[0134] The embodiment provides a backplane glass, which comprises a substrate glass and a high-reflectivity glaze layer with a composite structure arranged on the surface of the substrate 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 substrate glass. There is a clear boundary between the surface layer and the reflective layer, and between the reflective layer and the substrate glass.

[0135] The surface layer is a high-temperature bonding phase 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 surface layer in 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 55% based on the total weight of the surface layer.

[0136] 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 reflective layer in 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.

[0137] The substrate glass is a float ultra-white glass, and the thickness is 2.0 mm.

[0138] In order to more fully introduce the backplane glass, the embodiment also provides a manufacturing method thereof, comprising:

[0139] 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;

[0140] 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;

[0141] Step (3): forming a grid on the surface of the substrate glass by screen printing overprinting of 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 ℃ for 90-115 s.

[0142] Embodiment 11

[0143] 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 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 substrate glass, and there is a clear boundary between the surface layer and the reflection layer and between the reflection layer and the substrate glass.

[0144] The surface layer is a high-temperature adhesive phase accumulation layer, forms a dense high-whiteness reflection layer, mainly plays a role of protecting the whole multi-layer structure, the thickness of the surface layer is 8 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 65% based on 100% of the total weight of the surface layer.

[0145] The reflection layer is a white filler accumulation layer, compared with the surface layer, the material of the reflection layer is obviously loose, mainly used for providing basic reflectivity, and mainly in the form of diffuse reflection, the thickness of the reflection layer is 16 μm, the proportion of 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.

[0146] The substrate glass is a float ultra-white glass, and the thickness is 2.0 mm.

[0147] In order to more fully introduce the backplane glass, the embodiment also provides a manufacturing method thereof, comprising:

[0148] Step (1): mixing the glass powder and the first ink (a conventional ink commercially available) uniformly to obtain a first slurry;

[0149] Step (2): mixing the titanium dioxide, the glass powder and the second ink (a conventional ink commercially available) uniformly to obtain a second slurry;

[0150] Step (3): forming a grid on the surface of the substrate glass by screen printing the second slurry and the first slurry in a superposition manner, and then forming a high-reflective glaze layer with a composite structure on the substrate glass after furnace tempering at 690-740℃ for 90-115s.

[0151] Example 12

[0152] The backplane glass provided in the example differs from the backplane glass provided in Example 1 only in that the surface layer of the high-reflective glaze layer with a composite structure does not contain titanium dioxide.

[0153] Comparative Example 1

[0154] The backplane glass provided in the comparative example has a structure as shown in Figure 3 From Figure 3 which it can be seen that it comprises a substrate glass and a white glaze layer provided on the surface of the substrate glass, the white glaze layer being formed by printing a glass ink once on the surface of the substrate glass to a printing thickness of 24μm and then being cured and tempered.

[0155] The substrate glass is a float ultra-white glass with a thickness of 2.0mm.

[0156] Comparative Example 2

[0157] The backplane glass provided in the comparative example has a structure as shown in Figure 3 From Figure 3 which it can be seen that it comprises a substrate glass and a white glaze layer provided on the surface of the substrate glass, the white glaze layer being formed by printing a glass ink once on the surface of the substrate glass to a printing thickness of 24μm and then being cured and tempered.

[0158] The substrate glass is an embossed ultra-white glass with a thickness of 2.0mm.

[0159] Test Example 1

[0160] The middle positions of the backplane glass provided in Example 1 and the backplane glass provided in Comparative Example 1 were respectively subjected to local scanning electron microscopy, wherein the scanning electron microscopy graph of the backplane glass of Example 1 is as shown in Figure 2a and the scanning electron microscopy graph of the backplane glass of Comparative Example 1 is as shown in Figure 2b By comparing Figure 2a and Figure 2bAs can be seen, in the backplane glass provided by Example 1, the high-reflective glaze layer with the composite structure is arranged on the surface of the substrate glass, and the surface layer and the reflective layer in the high-reflective glaze layer with the composite structure, and the reflective layer and the substrate glass all have clear interfaces, and the base layer contains titanium white and a glass phase, and the surface layer contains a glass phase and titanium white uniformly distributed in the glass phase.

[0161] Test Example 2

[0162] In this test example, the reflectivity, the crosshatch strength, the pencil hardness, the PCT 96-hour test, the PID 192-hour test, the glass surface stress test, the four-point bending test and the drop ball impact height test of the backplane glasses provided by Examples 1-12 of the present application and Comparative Examples 1-2 are tested, wherein the reflectivity is tested by a spectrophotometer, and the test wavelength range is 380-1200 nm; the crosshatch strength is tested by a crosshatch knife; the pencil hardness is tested by a pencil hardness tester; the PCT 96-hour test is performed by using a high-pressure constant-temperature oven, and the test conditions are 121℃, 100% humidity, saturated steam pressure and continuous operation for 96 hours, and during the test process, it is observed whether the glaze layer has any change and whether the reflectivity attenuation is ≤2%; the PID 192-hour test is performed by laminating and sealing the backplane glass with the glaze layer into an assembly, and the test conditions are temperature 85℃, relative humidity 85%, direct current, voltage setting 1500V and continuous operation for 192 hours, and during the test process, it is observed whether the glaze layer has any color change; the glass surface stress is tested by a surface stress tester; the four-point bending is tested by a four-point bending tester; and the drop ball impact height is tested by using a plastic sleeve and a 227g steel ball, and the test is started from 0.6m, and the height is increased by 50mm each time.

[0163] In this test example, the reflectivity, the crosshatch strength, the pencil hardness, the PCT 96-hour test, the PID 192-hour test results of the backplane glasses provided by Examples 1-12 of the present application and Comparative Examples 1-2 are shown in Table 1 and Table 2, respectively. Figure 4

[0164] Table 1

[0165]

[0166] In this test example, the drop ball impact height test results of the backplane glasses provided by Examples 1-12 of the present application and Comparative Examples 1-2 are shown in Table 2.

[0167] Table 2

[0168]

[0169] ​

[0170] The backplate glass provided in Embodiment 1 of the present invention, namely float ultra-clear glass with a surface having a high-reflectivity enamel layer of composite structure and a thickness of 2.0 mm, has a reflectivity curve as shown in the figure. Figure 4 As shown, Figure 4 The reflectance curve shown is relatively smooth, with an average reflectance of over 89.6%. Figure 4 As can be seen, the reflectance curve of float ultra-white glass exhibits optimal reflectance in the 580-780nm range, with an average reflectance of over 89% in this band, which closely matches the response range of the solar cell; the reflectance in the 480-980nm band is generally above 88%. From the experimental data in Table 1, it can be seen that the backplate glass provided in Example 1 has a cross-cut strength of 0 and a pencil hardness >6H; after a 96-hour PCT test, the glaze layer showed no significant change; and after a 192-hour PID test, the glaze layer showed no discoloration. From the experimental data in Table 2, it can be seen that for the backplate glass provided in Example 1, the drop ball impact height is close to that of the bare sheet, with the blank area on the printed side at 1.8m, the T-shaped area on the non-screened side at 1.6m, and the central cross-shaped area at 1.4m. The load on the glass itself is not significantly affected.

[0171] As can be seen from the experimental data in Tables 1 and 2 above, the backplate glass provided in Embodiment 2 of the present invention, namely, the embossed ultra-clear glass with a 2.0 mm thick high-reflectivity glaze layer with a composite structure on its surface, has a reflectivity of 92.3%, a cross-cut strength of 0, and a pencil hardness >6H; the glaze layer showed no significant change after a 96-hour PCT test; and the glaze layer showed no discoloration after a 192-hour PID test.

[0172] The impact height of the falling ball is close to that of the bare glass: 1.6m in the blank area of ​​the silkscreened surface, 1.4m at the T-shaped edge of the non-silkscreened surface, and 1.2m at the central cross-shaped area. The load on the glass itself is not significantly affected.

[0173] As can be seen from the experimental data in Tables 1 and 2 above, the backplate glass provided in Embodiment 3 of the present invention, namely float ultra-clear glass with a thickness of 2.0 mm and a high reflectance glaze layer with a composite structure on its surface, has a reflectance of 86.5%, a cross-cut strength of 0, and a pencil hardness >6H; the glaze layer showed no significant change after a PCT 96-hour test; and the glaze layer showed no discoloration after a PID 192-hour test.

[0174] The impact height of the falling ball is close to that of the bare glass, with 1.8m in the blank area of ​​the printed surface, 1.4m at the T-shaped part of the non-screened surface, and 1.2m at the central cross-shaped part. The load on the glass itself is not significantly affected.

[0175] From the experimental data in the above table 1 and table 2, it can be seen that the reflectivity of the backplane glass provided by the embodiment 4 of the present application, i.e. the thickness of 2.0mm of the float ultra-white glass with the high-reflective glaze layer with the composite structure on the surface, is 90.2%, the mesh strength is 0-1 level, the pencil hardness is >4H; through the PCT 96 hours test, the glaze layer has no obvious change; and under the PID 192 hours test, the glaze layer has no discoloration;

[0176] The ball impact height is close to the bare chip, the blank area of the printing surface is 1.8m, the T-shaped part of the non-silk printing surface edge is 1.4m, and the cross-shaped part in the middle is 1.2m. The load of the glass itself is not greatly affected.

[0177] From the experimental data in the above table 1 and table 2, it can be seen that the reflectivity of the backplane glass provided by the embodiment 5 of the present application, i.e. the thickness of 2.0mm of the float ultra-white glass with the high-reflective glaze layer with the composite structure on the surface, is 85.8%, the mesh strength is 0 level, the pencil hardness is >6H; through the PCT 96 hours test, the glaze layer has no obvious change; and under the PID 192 hours test, the glaze layer has no discoloration;

[0178] The ball impact height is close to the bare chip, the blank area of the printing surface is 1.4m, the T-shaped part of the non-silk printing surface edge is 1.2m, and the cross-shaped part in the middle is 1.0m.

[0179] From the experimental data in the above table 1 and table 2, it can be seen that the reflectivity of the backplane glass provided by the embodiment 6 of the present application, i.e. the thickness of 2.0mm of the float ultra-white glass with the high-reflective glaze layer with the composite structure on the surface, is 88.8%, the mesh strength is 1 level, the pencil hardness is >6H; through the PCT 96 hours test, the glaze layer has no obvious change; and under the PID 192 hours test, the glaze layer has no discoloration;

[0180] The ball impact height is close to the bare chip, the blank area of the printing surface is 1.7m, the T-shaped part of the non-silk printing surface edge is 1.5m, and the cross-shaped part in the middle is 1.3m.

[0181] From the experimental data in the above table 1 and table 2, it can be seen that the reflectivity of the backplane glass provided by the embodiment 7 of the present application, i.e. the thickness of 2.0mm of the float ultra-white glass with the high-reflective glaze layer with the composite structure on the surface, is 85.6%, the mesh strength is 0 level, the pencil hardness is >6H; through the PCT 96 hours test, the glaze layer has no obvious change; and under the PID 192 hours test, the glaze layer has no discoloration;

[0182] The ball impact height is close to the bare chip, the blank area of the printing surface is 1.2m, the T-shaped part of the non-silk printing surface edge is 1.0m, and the cross-shaped part in the middle is 0.9m.

[0183] From the experimental data in Table 1 and Table 2 above, it can be seen that the reflectivity of the backplane glass provided by the embodiment 8 of the present application, i.e. the 2.0mm-thick float ultra-white glass with the high-reflective glaze layer with the composite structure arranged on the surface, is 88.4%, the mesh strength is 1 level, and the pencil hardness is >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;

[0184] The ball impact height is close to the bare chip, the blank area of the printing surface is 1.8m, the T-shaped part of the non-silk printing surface edge is 1.5m, and the cross-shaped part in the middle is 1.4m.

[0185] Compared with the embodiment 5 and the embodiment 6, the thickness of the high-reflective glaze layer with the composite structure in the embodiment 7 of the present application is too thick, although the performance of the glaze layer meets the requirements, but it does not meet the demand for thinning the glaze layer; the thickness of the high-reflective glaze layer with the composite structure in the embodiment 8 is too thin, although the performance of the glaze layer meets the requirements, but its durability is slightly poor.

[0186] From the experimental data in Table 1 and Table 2 above, it can be seen that the reflectivity of the backplane glass provided by the embodiment 9 of the present application, i.e. the 2.0mm-thick float ultra-white glass with the high-reflective glaze layer with the composite structure arranged on the surface, is 82.4%, the mesh strength is 0 level, and the pencil hardness is >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;

[0187] The ball impact height is close to the bare chip, the blank area of the printing surface is 1.0m, the T-shaped part of the non-silk printing surface edge is 0.9m, and the cross-shaped part in the middle is 0.8m.

[0188] Compared with the embodiment 1, the content of TiO2 in the high-reflective glaze layer with the composite structure provided by the embodiment 9 of the present application is too low, only 30%, although the performance of the glaze layer basically meets the requirements, but its reflectivity is relatively low.

[0189] From the experimental data in Table 1 and Table 2 above, it can be seen that the reflectivity of the backplane glass provided by the embodiment 10 of the present application, i.e. the 2.0mm-thick float ultra-white glass with the high-reflective glaze layer with the composite structure arranged on the surface, is 81.4%, the mesh strength is 2 level, and the pencil hardness is >3H; the PCT 96-hour test and the PID 192-hour test cannot be passed;

[0190] The ball impact height is close to the bare chip, the blank area of the printing surface is 1.4m, the T-shaped part of the non-silk printing surface edge is 1.2m, and the cross-shaped part in the middle is 0.9m.

[0191] From the experimental data in Table 1 and Table 2 above, it can be seen that the reflectivity of the backplane glass provided by the embodiment 11 of the present application, i.e. the thickness of the float ultra-white glass provided with the high-reflective glaze layer with the composite structure on the surface is 2.0 mm, is 82.2%, the mesh strength is 4, and the pencil hardness is > 2H; the PCT 96-hour test and the PID 192-hour test cannot be passed;

[0192] 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.

[0193] Compared with the embodiment 1, in the high-reflective glaze layer with the composite structure provided by the embodiments 10-11 of the present application, 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 example 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.

[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 the embodiment 12 of the present application, i.e. the thickness of the float ultra-white glass provided with the high-reflective glaze layer with the composite structure on the surface is 2.0 mm, is 81.6%, the mesh strength is 0, and the pencil hardness is > 6H; the PCT 96-hour test is passed, and the glaze layer has no obvious change; and under the PID 192-hour test, the glaze layer has no discoloration;

[0195] 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.

[0196] From the experimental results of the backplane glasses provided by the embodiment 1 and the embodiment 12 of the present application, it can be seen that when the surface layer of the high-reflective glaze layer with the composite structure of the backplane glass does not contain titanium white, the mesh 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 is low, only 81.6%.

[0197] From the experimental data in Table 1 and Table 2 above, it can be seen that the reflectivity of the backplane glass provided by the comparative example 1, i.e. the thickness of the float ultra-white glass provided with the white glaze layer on the surface is 2.0 mm, is 80%, the mesh strength is 0-1, and the pencil hardness is > 4H; the PCT 96-hour test is passed, and the glaze layer is locally failed; and under the PID 192-hour test, the glaze layer appears local delamination;

[0198] 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.

[0199] From the experimental data in the above table 1 and table 2, it can be seen that the reflectivity of the backplane glass provided by the comparative example 2, that is, 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;

[0200] Ball drop impact height: 1.2m for the blank area of the screen printing surface, 0.9m for the T-shaped part of the non-screen printing surface edge, and 0.8m for the middle cross part.

[0201] From the above experimental results, it can be seen that the high reflection glaze layer with a composite structure provided by the embodiment of the present application 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 reflection glaze layer with a composite structure is almost not affected, 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 intersection of the non-screen printing surface is close to that of the bare chip glass.

[0202] The above is only a specific embodiment of the present application, which cannot limit the scope of the application. Therefore, the replacement of equivalent components or equivalent changes and modifications made within the scope of the present application should still fall within the scope of the present patent. In addition, the technical features in the present application 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-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; The surface layer is a high-temperature binder phase accumulation layer and the reflective layer is a white filler accumulation layer; The surface layer further comprises white fillers which are uniformly distributed in the high-temperature binder phase accumulation layer, and the white fillers comprise titanium white, and the content of TiO2 in the surface layer is 25-45% based on the total weight of the surface layer. 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 40-60% based on the total weight of the reflective layer.

2. The high reflective glaze layer of claim 1, wherein The whiteness L value of the surface layer is ≥98.

5.

3. The high-reflectance glaze layer according to claim 1 or 2, characterized in that The D97 of the high-temperature binder phase in the surface layer is ≤8 μm.

4. The high reflective glaze layer of claim 1, wherein The whiteness L value of the reflective layer is ≥98.

5.

5. The high reflective glaze layer according to claim 1 or 4, characterized in that, The D97 of the white fillers in the reflective layer is less than 10 μm.

6. The high-reflectance glaze layer of claim 1 or 2, 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.

7. The high reflective glaze layer of claim 1, wherein The thickness of the surface layer is 5-20 μm and the thickness of the reflective layer is 8-25 μm.

8. The high reflective glaze layer according to claim 1 or 7, wherein The thickness of the high-reflective glaze layer with the composite structure is 18-30 μm.

9. The high reflective glaze layer of claim 1, 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.

10. The method of producing a high-reflectance glaze layer having a composite structure according to any one of claims 1 to 9, characterized in that, The production method comprises: Step (1): uniformly mixing a high-temperature binder phase, white fillers and a first ink adjusting agent to obtain a first slurry; Step (2): uniformly mixing white fillers and a second ink adjusting agent to obtain a second slurry; Step (3): sequentially coating the second slurry and the first slurry on a substrate glass to form a high-reflective glaze layer with a composite structure on the substrate glass after in-furnace tempering.

11. The method of manufacturing according to claim 10, wherein, The coating comprises printing, roller coating or spraying.

12. The production method according to claim 10 or 11, characterized by, The temperature of the in-furnace tempering is 690-740 ℃ and the time is 90-115 s.

13. A backsheet glass comprising a base glass and an enamel layer disposed on a surface thereof, characterized in that, The glaze layer is the high-reflective glaze layer with the composite structure according to any one of claims 1-9.

14. A photovoltaic module, characterized by The photovoltaic module comprises the backsheet glass according to claim 13.

15. The photovoltaic module of claim 14, wherein, The photovoltaic module is a double-glass photovoltaic solar module.

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