Photovoltaic glass super-hydrophilic coating material as well as preparation method and application thereof

Abstract

The invention relates to a photovoltaic glass super-hydrophilic coating material and a preparation method and application thereof, and belongs to the technical field of coating materials. The method comprises the following steps: mixing TiO2 and SiO2, and carrying out ball milling to obtain intermediate powder; carrying out compression molding on the intermediate powder to obtain a material blank; carrying out sintering treatment on the blank to obtain a coating material; wherein the mass ratio of the TiO2 to the SiO2 is (8: 2) to (5: 5); according to the method, TiO2 and SiO2 in a specific mass ratio are mixed and sintered to obtain the coating material, the used materials are common, the process is easy to realize, and industrial production can be realized. The prepared coating material has an ultra-low water drop angle after coating, and when the coating material is applied to photovoltaic glass, the influence of accumulated dust on the transmittance of the photovoltaic glass can be effectively reduced. In addition, the coating material can be used for preparing a film layer through vacuum evaporation, the binding force between the film layer and a substrate is strong, and the durability and the stability are excellent.

Description

Technical Field

[0001] The present application relates to the technical field of coating materials, and in particular to a photovoltaic glass super-hydrophilic coating material and a preparation method and application thereof. Background Art

[0002] In today's era of growing energy demand and increasingly urgent environmental protection, the development and utilization of solar energy as a clean and renewable energy source has attracted much attention. As an important field of solar energy utilization, the photovoltaic industry is developing rapidly. As a key component of photovoltaic modules, the performance of photovoltaic glass directly affects the power generation efficiency and stability of photovoltaic systems.

[0003] Traditional photovoltaic glass faces some challenges in practical use. For example, dust and dirt easily accumulate on the glass surface, reducing the light transmittance of the glass, which in turn affects the absorption and conversion efficiency of photovoltaic modules to solar energy. Driven by such demand, photovoltaic glass hydrophilic film came into being. The hydrophilic film can give the surface of photovoltaic glass good hydrophilicity, so that water droplets can quickly spread into a uniform water film on the glass surface. Under the scouring of rain, dust and dirt are more easily taken away, thereby keeping the glass surface clean and improving the light transmittance and power generation efficiency of photovoltaic modules. As the key to the preparation of hydrophilic film, the performance of the coating material directly determines the quality and effect of the hydrophilic film.

[0004] At present, the hydrophilicity of existing coating materials on the market still needs to be improved. Summary of the invention

[0005] The present application provides a photovoltaic glass super-hydrophilic coating material and a preparation method and application thereof, so as to improve the hydrophilicity of the coating material.

[0006] In a first aspect, the present application provides a method for preparing a photovoltaic glass super-hydrophilic coating material, the method comprising:

[0007] Mix TiO2 and SiO2 and ball-mill to obtain an intermediate powder;

[0008] Pressing and molding the intermediate powder to obtain a blank;

[0009] Sintering the blank to obtain a coating material;

[0010] Wherein, the mass ratio of the TiO2 to the SiO2 is 8:2 to 5:5.

[0011] As an optional implementation manner, the mass ratio of the TiO2 to the SiO2 is 7:3 to 6:4.

[0012] As an optional embodiment, the sintering temperature is greater than 1000° C.; and / or

[0013] The heating rate of the sintering treatment is 1°C / min to 10°C / min; and / or

[0014] The sintering treatment time is 6 hours to 15 hours.

[0015] As an optional embodiment, the sintering temperature is 1450° C. to 1550° C.; and / or

[0016] The heating rate of the sintering treatment is 4°C / min to 7°C / min; and / or

[0017] The sintering treatment time is 8h to 13h.

[0018] As an optional embodiment, the ball-to-material ratio of the ball mill is 3:1 to 10:1; and / or

[0019] The rotation speed of the ball mill is 200r / min to 400r / min; and / or

[0020] The ball milling time is 1 h to 12 h.

[0021] As an optional embodiment, the pressure of the pressing molding is 20MPa to 60MPa; and / or

[0022] The compression molding time is 5 to 20 minutes.

[0023] As an optional implementation, after the sintering is completed, the method further comprises: cooling the coating material; the cooling rate is 1°C / min to 10°C / min; and / or

[0024] After the sintering is completed, the method further includes: crushing the coating material, and the crushing is terminated when the particle size of the coating material is 1 mm to 5 mm.

[0025] In a second aspect, the present application provides a photovoltaic glass super-hydrophilic coating material, and the coating material is prepared by the method provided in the first aspect.

[0026] In a third aspect, the present application provides a photovoltaic glass, comprising a glass substrate and a film layer attached to a surface of the glass substrate, wherein the material of the film layer comprises the coating material provided in the second aspect.

[0027] In a fourth aspect, the present application provides a method for preparing photovoltaic glass, the method comprising:

[0028] obtaining a glass substrate;

[0029] The coating material provided in the second aspect is attached to the glass substrate by vacuum evaporation to form a film layer to obtain photovoltaic glass.

[0030] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0031] The method provided in the embodiment of the present application is to obtain a coating material by mixing and sintering TiO2 and SiO2 in a specific mass ratio. The materials used are common, the process is easy to implement, and industrial production can be achieved. The obtained coating material has an ultra-low water drop angle after coating. When applied to photovoltaic glass, it can effectively reduce the impact of dust accumulation on the transmittance of photovoltaic glass. In addition, the coating material can be prepared by vacuum evaporation. The film layer has a strong bonding force with the substrate and has excellent durability and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 A flowchart of the method provided in the embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0037] In actual use, dust and dirt easily accumulate on the surface of traditional photovoltaic glass, reducing the light transmittance of the glass, which in turn affects the absorption and conversion efficiency of photovoltaic modules to solar energy. Driven by such demand, hydrophilic film for photovoltaic glass came into being. Hydrophilic film can give the surface of photovoltaic glass good hydrophilicity, so that water droplets can quickly spread into a uniform water film on the glass surface. Under the scouring of rain, dust and dirt are more easily taken away, thereby keeping the glass surface clean and improving the light transmittance and power generation efficiency of photovoltaic modules. As the key to the preparation of hydrophilic film, the performance of coating material directly determines the quality and effect of hydrophilic film. At present, the hydrophilicity of existing coating materials on the market still needs to be improved.

[0038] The present application intends to provide a super hydrophilic coating material. The prepared coating material has an ultra-low water drop angle after coating. When applied to photovoltaic glass, it can effectively reduce the impact of dust accumulation on the transmittance of photovoltaic glass.

[0039] Figure 1 A flow chart of the method provided in the embodiment of the present application is as follows: Figure 1 As shown, the embodiment of the present application provides a method for preparing a photovoltaic glass super-hydrophilic coating material, the method comprising:

[0040] S1. Mix TiO2 and SiO2 and ball-mill to obtain an intermediate powder; wherein the mass ratio of the TiO2 to the SiO2 is 8:2 to 5:5.

[0041] In some embodiments, the mass ratio of TiO2 to the SiO2 is 7:3 to 6:4. By controlling the mass ratio of TiO2 to SiO2 within a suitable range, it is helpful to reduce the contact angle of the film layer obtained by the final coating material product. Exemplarily, the mass ratio of TiO2 to the SiO2 can be 8:2, 7.5:2.5, 7:3, 6.5:3.5, 6:4, 5.5:4.5, 5:5, etc., and it can also be any value within the range of 8:2 to 5:5.

[0042] In some embodiments, the ball-to-material ratio of the ball mill is 3:1 to 10:1; the rotation speed of the ball mill is 200 r / min to 400 r / min; and the ball milling time is 1 h to 12 h. Exemplarily, the ball-to-material ratio of the ball mill can be 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, etc., and it can also be any value in the range of 3:1 to 10:1. The rotation speed of the ball mill can be 200 r / min, 220 r / min, 240 r / min, 260 r / min, 280 r / min, 300 r / min, 320 r / min, 340 r / min, 360 r / min, 380 r / min, 400 r / min, etc., and it can also be any value in the range of 200 r / min to 400 r / min. The ball milling time can be 1 h, 2 h, 1.2 h, 3 h, 4 h, 5 h, 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, 12 h, etc., and it can also be any value within the range of 1 h to 12 h.

[0043] S2. The intermediate powder is pressed to obtain a blank;

[0044] In some embodiments, the pressure of the press molding is 20MPa to 60MPa, and the time of the press molding is 5 to 20min. Exemplarily, the pressure of the press molding can be 20MPa, 25MPa, 30MPa, 35MPa, 40MPa, 45MPa, 50MPa, 55MPa, 60MPa, etc., and it can also be any value within the range of 20MPa to 60MPa.

[0045] S3. The blank is sintered to obtain a coating material;

[0046] In some embodiments, the temperature of the sintering process is greater than 1000° C.; the heating rate of the sintering process is 1° C. / min to 10° C. / min; and the time of the sintering process is 6 h to 15 h.

[0047] Sintering is a key step in making the film layer of the final coated material product have a lower contact angle, especially the temperature of the sintering. Controlling the various parameters of the sintering within an appropriate range can be beneficial to forming a coated material product that can produce a film layer with a lower contact angle.

[0048] Furthermore, the temperature of the sintering treatment is 1450°C to 1550°C; the heating rate of the sintering treatment is 4°C / min to 7°C / min; and the time of the sintering treatment is 8h to 13h.

[0049] Illustratively, the temperature of the sintering treatment can be 1050°C, 1100°C, 1150°C, 1200°C, 1250°C, 1300°C, 1350°C, 1400°C, 1450°C, 1500°C, 1550°C, 1600°C, 1650°C, 1700°C, etc., and it can also be any value within the range greater than 1000°C. The heating rate of the sintering treatment can be 1℃ / min, 1.5℃ / min, 2℃ / min, 2.5℃ / min, 3℃ / min, 3.5℃ / min, 4℃ / min, 4.5℃ / min, 5℃ / min, 5.5℃ / min, 6℃ / min, 6.5℃ / min, 7℃ / min, 7.5℃ / min, 8℃ / min, 8.5℃ / min, 9℃ / min, 9.5℃ / min, 10℃ / min, etc., and it can also be any value in the range of 1℃ / min to 10℃ / min. The sintering treatment time can be 6h, 6.5h, 7h, 7.5h, 8h, 8.5h, 9h, 9.5h, 10h, 10.5h, 11h, 11.5h, 12h, 12.5h, 13h, 13.5h, 14h, 14.5h, 15h, etc., and it can also be any value within the range of 6h to 15h.

[0050] In some embodiments, after sintering, the method further comprises: cooling the coating material; the cooling rate is 1°C / min to 10°C / min. Exemplarily, the cooling rate can be 1°C / min, 1.5°C / min, 2°C / min, 2.5°C / min, 3°C / min, 3.5°C / min, 4°C / min, 4.5°C / min, 5°C / min, 5.5°C / min, 6°C / min, 6.5°C / min, 7°C / min, 7.5°C / min, 8°C / min, 8.5°C / min, 9°C / min, 9.5°C / min, 10°C / min, etc., and it can also be any value within the range of 1°C / min to 10°C / min.

[0051] In some embodiments, after sintering, the method further comprises: crushing the coating material, and the crushing is terminated when the particle size of the coating material is 1 mm to 5 mm. Exemplarily, the crushing can be terminated when the particle size of the coating material is 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, etc., and can also be any value within the range of 1 mm to 5 mm.

[0052] The method obtains a coating material by mixing and sintering TiO2 and SiO2 in a specific mass ratio. The materials used are common, the process is easy to implement, and industrial production can be achieved. The obtained coating material has an ultra-low water drop angle after coating. When applied to photovoltaic glass, it can effectively reduce the impact of dust accumulation on the transmittance of photovoltaic glass. In addition, the coating material can be prepared by vacuum evaporation. The film layer has a strong bonding force with the substrate and has excellent durability and stability.

[0053] The water drop angle refers to the angle θ between the tangent line of the solid-liquid interface at the intersection of the liquid and solid phases and the solid-liquid boundary line on the liquid side. The contact angle of the liquid on the surface of the solid material is an important parameter to measure the wetting performance of the liquid on the surface of the material. The water drop angle can be detected by methods known to those skilled in the art, for example, it can be measured by commercially available instruments such as a water drop angle tester.

[0054] Based on a general inventive concept, an embodiment of the present application further provides a photovoltaic glass super-hydrophilic coating material, and the coating material is prepared by the method provided above.

[0055] The coating material is prepared based on the above method. The specific steps of the method can refer to the above embodiment. Since the coating material adopts part or all of the technical solutions of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described one by one here.

[0056] Based on a general inventive concept, an embodiment of the present application further provides a photovoltaic glass, which includes a glass substrate and a film layer attached to the surface of the glass substrate, wherein the material of the film layer includes the coating material provided above.

[0057] The photovoltaic glass is realized based on the above-mentioned coating material. The specific content of the coating material can be referred to the above-mentioned embodiment. Since the photovoltaic glass adopts part or all of the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0058] In the present application, there is no limitation on the glass substrate, which can be any substrate used as photovoltaic glass that can be used by those skilled in the art.

[0059] In some embodiments, the photovoltaic glass containing the film liquid is composed of a film layer and an ultra-white glass substrate, and the ultra-white glass substrate is 2-6 mm ultra-white float glass or ultra-white embossed glass.

[0060] Based on a general inventive concept, the present application also provides a method for preparing photovoltaic glass, the method comprising:

[0061] S1. Obtaining a glass substrate;

[0062] S2. The coating material provided in the second aspect is attached to the glass substrate by vacuum evaporation to form a film layer to obtain photovoltaic glass.

[0063] The method obtains a coating material by mixing and sintering TiO2 and SiO2 in a specific mass ratio. The materials used are common, the process is easy to implement, and industrial production can be achieved. The obtained coating material has an ultra-low water drop angle after coating. When applied to photovoltaic glass, it can effectively reduce the impact of dust accumulation on the transmittance of photovoltaic glass. In addition, the coating material is prepared by vacuum evaporation. The film layer has a strong bonding force with the substrate and has excellent durability and stability.

[0064] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0065] Example 1

[0066] A super-hydrophilic coating material, the preparation steps of which are as follows:

[0067] (1) Raw material preparation: Weigh TiO2 powder and SiO2 powder with a purity of 99.9% at a weight ratio of TiO2:SiO2=7:3.

[0068] (2) Powder filling: The above powders are placed in the ball mill of a planetary ball mill for mixing, with a ball-to-material ratio of 5:1, a rotation speed of 300 r / min, and a ball milling mixing time of 8 h, until the powders are evenly mixed.

[0069] (3) The powder is pressed into shape by an isostatic press with a molding pressure of 50 MPa and a holding time of 10 min.

[0070] (4) The pressed green billet is sintered, and the sintering curve is as follows: the temperature is raised from room temperature to 1500°C at a rate of 1°C / min, and then kept at that temperature for 12 hours. After the end of the keeping temperature, the sintering temperature is reduced to room temperature at a cooling rate of 1°C / min.

[0071] (5) The sintered sample is crushed to obtain a super-hydrophilic coating material with a particle size of 1 to 3 mm.

[0072] Example 2

[0073] A super-hydrophilic coating material, the preparation steps of which are as follows:

[0074] (1) Raw material preparation: Weigh TiO2 powder and SiO2 powder with a purity of 99.9% at a weight ratio of TiO2:SiO2=6:4.

[0075] (2) Powder filling: The above powders are placed in the ball mill of a planetary ball mill for mixing, with a ball-to-material ratio of 5:1, a rotation speed of 300 r / min, and a ball milling mixing time of 8 h, until the powders are evenly mixed.

[0076] (3) The powder is pressed into shape by an isostatic press with a molding pressure of 50 MPa and a holding time of 10 min.

[0077] (4) The pressed green billet is sintered, and the sintering curve is: the temperature is raised from room temperature to 1500°C at a rate of 1°C / min, and then kept at this temperature for 12 hours. After the end of the keeping temperature, the sintering temperature is reduced to room temperature at a cooling rate of 1°C / min.

[0078] (5) The sintered sample is crushed to obtain a super-hydrophilic coating material with a particle size of 1 to 3 mm.

[0079] Example 3

[0080] A super-hydrophilic coating material, the preparation steps of which are as follows:

[0081] (1) Raw material preparation: Weigh TiO2 powder and SiO2 powder with a purity of 99.9% at a weight ratio of TiO2:SiO2=8:2.

[0082] (2) Powder filling: The above powders are placed in the ball mill of a planetary ball mill for mixing, with a ball-to-material ratio of 5:1, a rotation speed of 300 r / min, and a ball milling mixing time of 8 h, until the powders are evenly mixed.

[0083] (3) The powder is pressed into shape by an isostatic press with a molding pressure of 50 MPa and a holding time of 10 min.

[0084] (4) The pressed green billet is sintered, and the sintering curve is: the temperature is raised from room temperature to 1500°C at a rate of 1°C / min, and then kept at this temperature for 12 hours. After the end of the keeping temperature, the sintering temperature is reduced to room temperature at a cooling rate of 1°C / min.

[0085] (5) The sintered sample is crushed to obtain a super-hydrophilic coating material with a particle size of 1 to 3 mm.

[0086] Example 4

[0087] A super-hydrophilic coating material, the preparation steps of which are as follows:

[0088] (1) Raw material preparation: Weigh TiO2 powder and SiO2 powder with a purity of 99.9% at a weight ratio of TiO2:SiO2=5:5.

[0089] (2) Powder filling: The above powders are placed in the ball mill of a planetary ball mill for mixing, with a ball-to-material ratio of 5:1, a rotation speed of 300 r / min, and a ball milling mixing time of 8 h, until the powders are evenly mixed.

[0090] (3) The powder is pressed into shape by an isostatic press with a molding pressure of 50 MPa and a holding time of 10 min.

[0091] (4) The pressed green billet is sintered, and the sintering curve is: the temperature is raised from room temperature to 1500°C at a rate of 1°C / min, and then kept at this temperature for 12 hours. After the end of the keeping temperature, the sintering temperature is reduced to room temperature at a cooling rate of 1°C / min.

[0092] (5) The sintered sample is crushed to obtain a super-hydrophilic coating material with a particle size of 1 to 3 mm.

[0093] Example 5

[0094] A super-hydrophilic coating material, the preparation steps of which are as follows:

[0095] (1) Raw material preparation: Weigh TiO2 powder and SiO2 powder with a purity of 99.9% at a weight ratio of TiO2:SiO2=7:3.

[0096] (2) Powder filling: The above powders are placed in the ball mill of a planetary ball mill for mixing, with a ball-to-material ratio of 5:1, a rotation speed of 300 r / min, and a ball milling mixing time of 8 h, until the powders are evenly mixed.

[0097] (3) The powder is pressed into shape by an isostatic press with a molding pressure of 50 MPa and a holding time of 10 min.

[0098] (4) The pressed green billet is sintered, and the sintering curve is as follows: the temperature is raised from room temperature to 1000°C at a rate of 1°C / min, and then kept at that temperature for 12 hours. After the end of the keeping temperature, the sintering temperature is reduced to room temperature at a cooling rate of 1°C / min.

[0099] (5) The sintered sample is crushed to obtain a super-hydrophilic coating material with a particle size of 1 to 3 mm.

[0100] Example 6

[0101] A super-hydrophilic coating material, the preparation steps of which are as follows:

[0102] (1) Raw material preparation: Weigh TiO2 powder and SiO2 powder with a purity of 99.9% at a weight ratio of TiO2:SiO2=7:3.

[0103] (2) Powder filling: The above powders are placed in the ball mill of a planetary ball mill for mixing, with a ball-to-material ratio of 5:1, a rotation speed of 300 r / min, and a ball milling mixing time of 8 h, until the powders are evenly mixed.

[0104] (3) The powder is pressed into shape by an isostatic press with a molding pressure of 50 MPa and a holding time of 10 min.

[0105] (4) The pressed green billet is sintered, and the sintering curve is as follows: the temperature is raised from room temperature to 1700°C at a rate of 1°C / min, and then kept at that temperature for 12 hours. After the end of the keeping temperature, the sintering temperature is reduced to room temperature at a cooling rate of 1°C / min.

[0106] (5) The sintered sample is crushed to obtain a super-hydrophilic coating material with a particle size of 1 to 3 mm.

[0107] Comparative Example 1

[0108] A super-hydrophilic coating material, the preparation steps of which are as follows:

[0109] (1) Raw material preparation: Weigh TiO2 powder and SiO2 powder with a purity of 99.9% at a weight ratio of TiO2:SiO2=2:8.

[0110] (2) Powder filling: The above powders are placed in the ball mill of a planetary ball mill for mixing, with a ball-to-material ratio of 5:1, a rotation speed of 300 r / min, and a ball milling mixing time of 8 h, until the powders are evenly mixed.

[0111] (3) The powder is pressed into shape by an isostatic press with a molding pressure of 50 MPa and a holding time of 10 min.

[0112] (4) The pressed green billet is sintered, and the sintering curve is: the temperature is raised from room temperature to 1500°C at a rate of 1°C / min, and then kept at this temperature for 12 hours. After the end of the keeping temperature, the sintering temperature is reduced to room temperature at a cooling rate of 1°C / min.

[0113] (5) The sintered sample is crushed to obtain a super-hydrophilic coating material with a particle size of 1 to 3 mm.

[0114] Comparative Example 2

[0115] A super-hydrophilic coating material, the preparation steps of which are as follows:

[0116] (1) Raw material preparation: Weigh TiO2 powder and SiO2 powder with a purity of 99.9% at a weight ratio of TiO2:SiO2=9:1.

[0117] (2) Powder filling: The above powders are placed in the ball mill of a planetary ball mill for mixing, with a ball-to-material ratio of 5:1, a rotation speed of 300 r / min, and a ball milling mixing time of 8 h, until the powders are evenly mixed.

[0118] (3) The powder is pressed into shape by an isostatic press with a molding pressure of 50 MPa and a holding time of 10 min.

[0119] (4) The pressed green billet is sintered, and the sintering curve is: the temperature is raised from room temperature to 1500°C at a rate of 1°C / min, and then kept at this temperature for 12 hours. After the end of the keeping temperature, the sintering temperature is reduced to room temperature at a cooling rate of 1°C / min.

[0120] (5) The sintered sample is crushed to obtain a super-hydrophilic coating material with a particle size of 1 to 3 mm.

[0121] The super-hydrophilic coating material provided in each embodiment and comparative example is evaporated onto the surface of the glass substrate by vacuum evaporation. The specific evaporation process is as follows:

[0122] (1) Pump the vacuum degree of the vacuum chamber to less than 6×10 -3 Pa, the temperature of the vacuum chamber is heated to 180°C, and the turntable of the coating machine is turned on with a rotation speed of 30r / min to ensure that the photovoltaic glass substrate on the turntable is heated evenly.

[0123] (2) Vacuum evaporation of super-hydrophilic coating materials. The coating process is as follows: first, oxygen is filled with oxygen at a flow rate of 90 sccm for half an hour, and then the vacuum degree is <6×10 -3 After Pa, the film material is pre-melted, pre-melted for 5 minutes at 20mA electron gun current, pre-melted for 5 minutes at 40mA electron gun current, pre-melted for 5 minutes at 60mA electron gun current, and pre-melted for 5 minutes at 80mA electron gun current (in sequence), and then the baffle is opened to start formal coating, the film formation rate is 0.15nm / s, the electron gun current is adjusted according to the film formation rate, the coating thickness is 60um, the oxygen flow rate is 90sccm, and the electron gun current is adjusted according to the film formation rate.

[0124] (3) After the coating is completed, wait for the vacuum chamber to cool down to below 50°C and then take out the coated photovoltaic glass.

[0125] The glass substrate uses 4mm thick ultra-clear float glass, and then the water drop angle and durability of the photovoltaic glass after coating are tested;

[0126] Water drop angle test: measured using a water drop angle tester;

[0127] Durability test: Use steel wool to move back and forth on the coated photovoltaic glass at a gravity of 1KG for 5000 times, and test the water drop angle after 5000 frictions.

[0128] The main parameter control and test results of each embodiment and comparative example are shown in the following table:

[0129]

[0130] It can be seen from the above table that the coating material provided by the method provided in the embodiment of the present application has an ultra-low water drop angle after coating and has excellent durability.

[0131] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0132] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present specification, the terms "including", "comprising", etc. refer to "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In this article, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e. a and b), ac, bc or abc, where a, b, c can be single or plural, respectively.

[0133] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for preparing a photovoltaic glass super-hydrophilic coating material, characterized in that: The method comprises: Mix TiO2 and SiO2 and ball-mill to obtain an intermediate powder; Pressing and molding the intermediate powder to obtain a blank; Sintering the blank to obtain a coating material; Wherein, the mass ratio of the TiO2 to the SiO2 is 8:2 to 5:

5.

2. The method for preparing the photovoltaic glass super-hydrophilic coating material according to claim 1, characterized in that: The mass ratio of the TiO2 to the SiO2 is 7:3 to 6:

4.

3. The method for preparing a photovoltaic glass super-hydrophilic coating material according to any one of claims 1 to 2, characterized in that: The sintering temperature is greater than 1000°C; and / or The heating rate of the sintering treatment is 1°C / min to 10°C / min; and / or The sintering treatment time is 6 hours to 15 hours.

4. The method for preparing the photovoltaic glass super-hydrophilic coating material according to claim 3, characterized in that: The sintering temperature is 1450°C to 1550°C; and / or The heating rate of the sintering treatment is 4°C / min to 7°C / min; and / or The sintering treatment time is 8h to 13h.

5. The method for preparing a photovoltaic glass super-hydrophilic coating material according to any one of claims 1 to 2, characterized in that: The ball-to-material ratio of the ball mill is 3:1 to 10:1; and / or The rotation speed of the ball mill is 200r / min to 400r / min; and / or The ball milling time is 1 h to 12 h.

6. The method for preparing a photovoltaic glass super-hydrophilic coating material according to any one of claims 1 to 2, characterized in that: The compression molding pressure is 20MPa to 60MPa; and / or The compression molding time is 5 to 20 minutes.

7. The method for preparing a photovoltaic glass super-hydrophilic coating material according to any one of claims 1 to 2, characterized in that: After the sintering is completed, the method further comprises: cooling the coating material; the cooling rate is 1°C / min to 10°C / min; and / or After the sintering is completed, the method further includes: crushing the coating material, and the crushing is terminated when the particle size of the coating material is 1 mm to 5 mm.

8. A photovoltaic glass super-hydrophilic coating material, characterized in that: The coating material is prepared by the method according to any one of claims 1 to 7.

9. A photovoltaic glass, characterized in that: The photovoltaic glass comprises a glass substrate and a film layer attached to the surface of the glass substrate, and the material of the film layer comprises the coating material according to claim 8.

10. A method for preparing photovoltaic glass, characterized in that: The method comprises: obtaining a glass substrate; The coating material according to claim 8 is attached to the glass substrate by vacuum evaporation to form a film layer to obtain photovoltaic glass.

Images