AR film, double-sided coated glass and preparation and application of double-sided coated glass

Abstract

The invention relates to the technical field of photovoltaic panels, and discloses an AR film, double-sided coated glass and preparation and application thereof. The AR film comprises SiO2 layers and Nb2O5 layers, wherein the SiO2 layers and the Nb2O5 layers are alternately stacked, and the number of the SiO2 layers and the number of the Nb2O5 layers are respectively not less than 10; the top layer and the bottom layer of the AR film are SiO2 layers; the thicknesses of the two adjacent SiO2 layers are different, and the difference value D1 is 2-185 nm; the thicknesses of two adjacent Nb2O5 layers are different, and the difference value D2 is 0.1 nm to 100 nm; the thickness of each SiO2 layer is respectively and independently 1 nm to 220 nm; and the thickness of each Nb2O5 layer is respectively and independently 1 nm to 125 nm. The average transmissivity of the double-sided coated glass prepared from the AR film in the wave band of 350-1100 nm is greater than 96%, and the double-sided coated glass has an excellent application prospect in photovoltaic glass panels.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic panels, and in particular to an AR film, double-sided coated glass, and preparation and application thereof. Background Art

[0002] With the continuous advancement of science and technology, solar energy is increasingly used around the world. Although the conversion efficiency of solar energy has been greatly improved compared with before, it is still at a relatively low level compared with hydropower and thermal power. Therefore, improving the conversion efficiency of solar energy has always been a hot topic that needs to be continuously improved.

[0003] Photovoltaic panel glass has the characteristics of high strength, high transmittance and high weather resistance. It is an important material in the photovoltaic industry chain. By coating it with AR film (anti-reflection film), its transmittance can be improved, thereby improving the transmittance of sunlight and increasing the utilization rate of solar energy.

[0004] CN115343787A discloses an AR film, which includes an Al2O3 layer, a first Nb2O5 layer, a first SiO2 layer, a second Nb2O5 layer, a second SiO2 layer, and a ZrO2 layer stacked in sequence; the thickness of the Al2O3 layer is 8-12nm, the thickness of the first Nb2O5 layer is 8-12nm, the thickness of the first SiO2 layer is 30-35nm, the thickness of the second Nb2O5 layer is 108-115nm, the thickness of the second SiO2 layer is 63-70nm, and the thickness of the ZrO2 layer is 7-10nm; the thickness of the Al2O3 layer is greater than the thickness of the ZrO2 layer. The AR film provided in the prior art has strong adhesion to the substrate, but the AR film has poor ability to reduce light reflection, and the average transmittance in the 350-1100nm band is only about 87%. If the AR film is applied to photovoltaic glass, the solar energy conversion efficiency still needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to overcome the problem of low transmittance of photovoltaic panel glass in the prior art.

[0006] In order to achieve the above-mentioned object, the first aspect of the present invention provides an AR film, which comprises SiO2 layers and Nb2O5 layers alternately stacked, and the number of layers of the SiO2 layers and the Nb2O5 layers is not less than 10 layers respectively; and the top layer and the bottom layer of the AR film are both SiO2 layers;

[0007] The thickness of two adjacent SiO2 layers is different and the difference D1 is 2nm-185nm; the thickness of two adjacent Nb2O5 layers is different and the difference D2 is 0.1nm-100nm;

[0008] The thickness of each SiO2 layer is independently 1nm-220nm; the thickness of each Nb2O5 layer is independently 1nm-125nm;

[0009] And, the thicknesses of any two adjacent layers are controlled so that the reflectivity of the AR film is less than 2%.

[0010] Preferably, the thickness difference D3 between the top layer and the bottom layer of the AR film is 40nm-100nm.

[0011] A second aspect of the present invention provides a double-sided coated glass, the double-sided coated glass comprising a first AR film, glass, a second AR film and an AF film stacked in sequence;

[0012] The bottom layer in the first AR film and the bottom layer in the second AR film are respectively attached to two surfaces of the glass;

[0013] The average transmittance of the double-sided coated glass in the 350-1100nm band is greater than 96%;

[0014] The first AR film and the second AR film are the AR films described in the first aspect above.

[0015] Preferably, the first AR film is identical to the second AR film.

[0016] Preferably, the water drop angle on the surface of the AF film in the double-sided coated glass is greater than 110°.

[0017] Preferably, the glass is ultra-white glass.

[0018] Preferably, the glass has a thickness of 0.3-10 mm.

[0019] Preferably, the thickness of the AF film is 10-20 nm.

[0020] Preferably, the material forming the AF film layer is perfluoropolyether.

[0021] The third aspect of the present invention provides a method for preparing the double-sided coated glass according to the second aspect, the method comprising:

[0022] (1) coating a first AR film on one side of the glass to be coated, and coating a second AR film on the other side, to obtain glass containing an AR film;

[0023] (2) coating an AF film on any one side of the glass containing the AR film to obtain double-sided coated glass.

[0024] The fourth aspect of the present invention provides the use of the double-sided coated glass described in the second aspect in a photovoltaic panel.

[0025] The AR film provided by the present invention has good performance in reducing light reflection. The AR film provided by the present invention is applied to the preparation of double-sided coated glass, so that the average transmittance of the double-sided coated glass in the 350-1100nm band is greater than 96%, overcoming the defect of low transmittance of traditional photovoltaic glass.

[0026] The double-sided coated glass provided by the present invention not only has a high average transmittance, but also has a self-cleaning function, and has good application prospects in the field of photovoltaic panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the double-sided coated glass provided by the present invention. DETAILED DESCRIPTION

[0028] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0029] As mentioned above, the first aspect of the present invention provides an AR film, which comprises SiO2 layers and Nb2O5 layers alternately stacked, and the number of layers of the SiO2 layers and the Nb2O5 layers is not less than 10 layers respectively; and the top layer and the bottom layer of the AR film are both SiO2 layers;

[0030] The thickness of two adjacent SiO2 layers is different and the difference D1 is 2nm-185nm; the thickness of two adjacent Nb2O5 layers is different and the difference D2 is 0.1nm-100nm;

[0031] The thickness of each SiO2 layer is independently 1nm-220nm; the thickness of each Nb2O5 layer is independently 1nm-125nm;

[0032] And, the thicknesses of any two adjacent layers are controlled so that the reflectivity of the AR film is less than 2%.

[0033] Preferably, the thickness difference D3 between the top layer and the bottom layer of the AR film is 40nm-100nm. The inventors of the present invention have found that in this preferred case, when the AR film is applied to double-sided coated glass, the obtained double-sided coated glass has a higher average transmittance.

[0034] It should be noted that the difference in the present invention is the absolute value of the difference in thickness.

[0035] In the present invention, the material forming the SiO2 layer has a refractive index of less than 1.47 at 550nm and an extinction coefficient of less than 7×10 -4 The material forming the Nb2O5 has a refractive index of >2.30 at 550nm and an extinction coefficient of <7×10 -4 .

[0036] A second aspect of the present invention provides a double-sided coated glass, the double-sided coated glass comprising a first AR film, glass, a second AR film and an AF film stacked in sequence;

[0037] The bottom layer in the first AR film and the bottom layer in the second AR film are respectively attached to two surfaces of the glass;

[0038] The average transmittance of the double-sided coated glass in the 350-1100nm band is greater than 96%;

[0039] The first AR film and the second AR film are the AR films described in the first aspect above.

[0040] Preferably, the first AR film is identical to the second AR film.

[0041] In a preferred embodiment, the water drop angle on the surface of the AF film in the double-sided coated glass is greater than 110°. The inventors of the present invention have found that in this preferred embodiment, the obtained double-sided coated glass has better self-cleaning performance.

[0042] Preferably, the refractive index of the glass is 1.46-2.0.

[0043] Preferably, the glass is ultra-white glass.

[0044] Preferably, the thickness of the glass is 0.3-10 mm.

[0045] Preferably, the area of ​​the glass is 2m×1m-2m×2m.

[0046] Preferably, the thickness of the AF film is 10-20 nm. The inventors of the present invention have found that in this preferred case, the obtained double-sided coated glass is easy to clean and has a high average transmittance, and its application in photovoltaic panels can effectively improve the conversion efficiency of solar energy.

[0047] Preferably, the material forming the AF film layer is perfluoropolyether.

[0048] The present invention Figure 1 A structural schematic diagram of the double-sided coated glass is provided as an example.

[0049] like Figure 1As shown, the double-sided coated glass includes a first AR film, glass, a second AR film and an AF film which are stacked in sequence.

[0050] The third aspect of the present invention provides a method for preparing the double-sided coated glass according to the second aspect, the method comprising:

[0051] (1) coating a first AR film on one side of the glass to be coated, and coating a second AR film on the other side, to obtain glass containing an AR film;

[0052] (2) coating an AF film on any one side of the glass containing the AR film to obtain double-sided coated glass.

[0053] The present invention has no special requirements for the method of coating the first AR film and the method of coating the second AR film, and those skilled in the art can select them according to conventional technical conditions in the art. For example, in step (1), the coating of the first AR film and the coating of the second AR film are both performed by vacuum magnetron sputtering coating.

[0054] Preferably, when coating the SiO2 layer in the first AR film and the second AR film, the target power of the coating machine is 33kw-38kw, the target argon is 950sccm-1050sccm, the target oxygen is 150sccm-250sccm, and the trolley forward speed is 0.5m / min-1m / min.

[0055] Preferably, when coating the Nb2O5 layer in the first AR film and the second AR film, the target power of the coating machine is 28kw-32kw, the target argon is 950sccm-1050sccm, the target oxygen is 450sccm-550sccm, and the forward speed of the trolley is 0.5m / min-1m / min.

[0056] The present invention has no special requirements for the method of coating the AF film, and those skilled in the art can select it according to conventional technical conditions in the art. For example, in step (2), the perfluoropolyether is evaporated and deposited on the surface of the first AR film or the surface of the second AR film by an evaporation coating method to form an AF film.

[0057] Preferably, the conditions of the evaporation coating method include: vacuum bottom pressure 9×10 -6 Pa-9×10 -3 Pa, steam resistance current 18-22A, conveying speed 0.6-1m / min, baking temperature 110-150℃, baking time 50-70min.

[0058] The fourth aspect of the present invention provides the use of the double-sided coated glass described in the second aspect in a photovoltaic panel.

[0059] The present invention will be described in detail below by way of examples. In the following examples, unless otherwise specified, all the instruments and raw materials used are commercially available.

[0060] Perfluoropolyether: purchased from Daikin Company, brand name UD509.

[0061] Ultra-white glass: The average transmittance in the 350-1100 nm band is 92%, the refractive index is 1.52, the thickness is 2 mm, the area is 2 m×1 m, purchased from Sichuan Hongke Optoelectronics Technology Co., Ltd., the brand is MN228.

[0062] Coating machine: Magnetron sputtering coating machine, model HD-ILS-2000.

[0063] The present invention carries out evaporation coating of AF film on a coating machine of model HD-ILS-2000.

[0064] The parameters of the magnetron sputtering coating machine in the following examples of the present invention are shown in Table 1 below.

[0065] Table 1

[0066]

[0067] In the following examples of the present invention, the first AR film is the same as the second AR film and both have 25 layers. The first SiO2 layer is defined as the bottom layer in the AR film, and the thirteenth SiO2 layer is defined as the top layer in the AR film.

[0068] Example 1

[0069] This embodiment is used to illustrate the preparation of double-sided coated glass with reference to the film layer structure shown in Table 2 and according to the following steps.

[0070] (1) coating a first AR film on one side of the ultra-clear glass to be coated, and coating a second AR film on the other side to obtain glass containing an AR film;

[0071] (2) Coating an AF film on any side of the glass containing the AR film (conditions include: vacuum bottom pressure 5×10 -3 Pa, steam resistance current 20A, conveying speed 0.8 m / min, baking temperature 130°C, baking time 60 min) to obtain double-sided coated glass.

[0072] Unless otherwise specified, the remaining Examples 2-4 and Comparative Examples 1-2 are all carried out in a similar manner to Example 1, except that the thickness of the film layer in the first AR film is different from that in Example 1, as shown in Table 2.

[0073] Table 2

[0074]

[0075] Test Case

[0076] 1. Referring to the method in GB / T13452.3-92 standard, the reflectivity of the first AR film in the above example was tested. The results are shown in Table 3.

[0077] 2. The average transmittance of the double-sided coated glass prepared in the above example in the 350-1100nm band (refer to GB / T2410-2008 standard) and the surface water drop angle of the AF film in the double-sided coated glass (refer to GB / T 24368-2009 standard) were tested. The results are shown in Table 3.

[0078] Table 3

[0079]

[0080] It can be seen from the above results that the AR film provided by the present invention has an extremely low reflectivity (<2%). When the AR film provided by the present invention is applied to double-sided coated glass, the average transmittance of the double-sided coated glass in the 350-1100nm band is >96%.

[0081] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. An AR film, characterized in that: The AR film comprises SiO2 layers and Nb2O5 layers alternately stacked, and the number of layers of the SiO2 layers and the Nb2O5 layers is not less than 10 layers respectively; and the top layer and the bottom layer of the AR film are both SiO2 layers; The thickness of two adjacent SiO2 layers is different and the difference D1 is 2nm-185nm; the thickness of two adjacent Nb2O5 layers is different and the difference D2 is 0.1nm-100nm; The thickness of each SiO2 layer is independently 1nm-220nm; the thickness of each Nb2O5 layer is independently 1nm-125nm; And, the thicknesses of any two adjacent layers are controlled so that the reflectivity of the AR film is less than 2%.

2. The AR film according to claim 1, characterized in that The thickness difference D3 between the top layer and the bottom layer of the AR film is 40nm-100nm.

3. A double-sided coated glass, characterized in that: The double-sided coated glass comprises a first AR film, glass, a second AR film and an AF film which are stacked in sequence; The bottom layer in the first AR film and the bottom layer in the second AR film are respectively attached to two surfaces of the glass; The average transmittance of the double-sided coated glass in the 350-1100nm band is greater than 96%; The first AR film and the second AR film are the AR films according to claim 1 or 2.

4. The double-sided coated glass according to claim 3, characterized in that: The first AR film is identical to the second AR film.

5. The double-sided coated glass according to claim 3 or 4, characterized in that: The water drop angle on the surface of the AF film in the double-sided coated glass is greater than 110°.

6. The double-sided coated glass according to claim 3 or 4, characterized in that: The glass is ultra-white glass.

7. The double-sided coated glass according to claim 3 or 4, characterized in that: The thickness of the glass is 0.3-10 mm; And / or, the thickness of the AF film is 10-20 nm.

8. The double-sided coated glass according to claim 3 or 4, characterized in that: The material forming the AF film layer is perfluoropolyether.

9. A method for preparing the double-sided coated glass according to any one of claims 3 to 8, characterized in that: The method includes: (1) coating a first AR film on one side of the glass to be coated, and coating a second AR film on the other side, to obtain glass containing an AR film; (2) coating an AF film on any one side of the glass containing the AR film to obtain double-sided coated glass.

10. Application of the double-sided coated glass according to any one of claims 3 to 8 in photovoltaic panels.

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