Light conversion black appearance shielding film, preparation method thereof and photovoltaic module

Abstract

The invention provides a light conversion black appearance shielding film, a preparation method thereof and a photovoltaic module. The shielding film comprises a base material layer; the black infrared transmitting layer is positioned on the surface of the base material layer and is used for enabling the shielding film to have a black appearance, and infrared light passes through the black infrared transmitting layer; the visible light conversion layer is located on the surface, away from the base material layer, of the black infrared transmitting layer or located on the surface, away from the black infrared transmitting layer, of the base material layer and used for converting ultraviolet-visible light into infrared light. According to the invention, the problem of color difference between the periphery / spacing / bus bar / solder strip of the photovoltaic module and the cell panel is solved, and on one hand, the shielding film has relatively excellent temperature resistance and insulating property by utilizing the infrared transmission capability of the shielding film; on the other hand, ultraviolet-visible light is converted into infrared light through the shielding film, the infrared light is reflected through the back plate, sunlight in gaps of the photovoltaic module can be reflected to the solar cell again and is absorbed and utilized by the silicon wafer for power generation, and the light source utilization rate is further increased.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic module technology, and in particular to a light-converting black-looking shielding film, its preparation method, and a photovoltaic module. Background Technology

[0002] As photovoltaic solar modules face increasingly stringent aesthetic requirements, exposed busbars and solder ribbons negatively impact appearance and waste light from gaps in the modules, preventing absorption by the cells. Therefore, it is necessary to shield the perimeter of the modules, the gaps between cells, and the busbars and solder ribbons. Current technology involves applying a standard black shielding film to the gaps between cells before lamination, which is then encapsulated within the module along with the front and rear encapsulating films during lamination to shield the busbars. However, this type of gap film only provides color adjustment, and because standard black shielding films use carbon black as a dye, which strongly absorbs light in the 300-1300nm wavelength range, it causes localized temperature increases and accelerates film aging.

[0003] With advancements in light utilization research, it has been discovered that combining a white coating with a black infrared-transmitting layer can reuse some infrared light after reflection and refraction, thereby improving ordinary black shielding films. This type of structure consists of a top-down black infrared-transmitting layer-substrate-reflective layer. However, this method wastes ultraviolet-visible light sources, and the improvement in component power is not significant or nonexistent.

[0004] Patent CN119529693 A disclosed a method for reflection relying on a back reflective coating. However, due to the presence of the coating, this method causes a "white edge" phenomenon, where the white edges leave obvious white marks under light refraction after the battery cells are laminated, severely affecting the uniformity of the battery's appearance. Furthermore, because it absorbs ultraviolet-visible light and relies solely on reflective powder to reflect light from sources in the 780-1200nm wavelength range, the light source utilization rate is low. Summary of the Invention

[0005] Based on the technical problems existing in the background art, this invention proposes a light-converting black-looking shielding film, its preparation method, and a photovoltaic module. While solving the problems of color difference between the photovoltaic module busbar / strip, module gap, and the edges and the solar panel, it utilizes the infrared transmittance of the shielding film to give it excellent temperature resistance and insulation performance. Furthermore, by using the shielding film to convert ultraviolet-visible light into infrared light and relying on the backsheet to reflect the infrared light, the sunlight around the photovoltaic module and the gaps can be reflected back onto the solar cells and absorbed by the silicon wafer to generate electricity, further increasing the utilization rate of the light source.

[0006] The present invention proposes a light-converting black appearance masking film, comprising: Substrate layer; A black infrared-transmitting layer is located on the surface of the substrate layer to give the shielding film a black appearance and allow infrared light to pass through. A visible light conversion layer is located on the surface of the black infrared-transmitting layer away from the substrate layer or on the surface of the substrate layer away from the black infrared-transmitting layer, and is used to convert ultraviolet-visible light into infrared light.

[0007] Preferably, the substrate layer is a PI film layer or a PET film layer; Preferably, the thickness of the substrate layer is 10-200 μm.

[0008] Preferably, the black infrared-transmitting layer has a transmittance of ≥90% for near-infrared light in the 780-1300nm band; the color difference index L value is 22-26, a value is 0±5, and b value is 0±5. Preferably, the thickness of the black infrared-transmitting layer is 5-15 μm.

[0009] Preferably, the black infrared-transmitting layer is formed by coating an organic coating containing black infrared-transmitting organic pigments; Preferably, the black infrared-transmitting organic pigment includes perylene black pigment; Preferably, the organic coating comprises component A and component B in a mass ratio of 100:10-30; component A comprises, by weight: 15-30 parts of hydroxyl resin, 25-35 parts of black infrared-transmitting organic pigment, 1-5 parts of additives, and 10-25 parts of solvent; component B comprises, by weight: 5-15 parts of isocyanate curing agent and 5-15 parts of solvent.

[0010] Preferably, the visible light conversion layer converts 300-700nm ultraviolet-visible light into 780-1300nm near-infrared light; Preferably, the thickness of the visible light conversion layer is 5-10 μm.

[0011] Preferably, the light conversion layer is formed by coating an organic coating containing an infrared light converter; Preferably, the infrared light converter includes Cr. 3+ Ion-activated Na3Al2(PO4)2F3 phototransfer agent; Preferably, the organic coating comprises component A and component B in a mass ratio of 100:30-50; component A comprises, by weight: 20-40 parts of hydroxyl resin, Cr 3+ The components are: 0.05-1.5 parts of ion-activated Na3Al2(PO4)2F3 phototransfer agent, 2-8 parts of additives, and 20-35 parts of solvent; component B includes, by weight: 10-20 parts of isocyanate curing agent and 15-25 parts of solvent.

[0012] Preferably, the shielding film further includes an adhesive layer located on the surface of the visible light conversion layer away from the black infrared-transmitting layer, for bonding the shielding film to the photovoltaic module; Preferably, the adhesive layer is an EVA layer, a POE layer, or an EPE layer; Preferably, the thickness of the adhesive layer is 30-200 μm.

[0013] This invention also proposes a method for preparing the above-mentioned light-converting black appearance masking film, comprising: Provide a substrate layer; A black infrared-transmitting layer is formed on the surface of the substrate layer; A light conversion layer is formed on the surface of the black infrared-transmitting layer away from the substrate layer or on the surface of the substrate layer away from the black infrared-transmitting layer.

[0014] Preferably, an adhesive layer is formed on the surface of the visible light conversion layer away from the black infrared-transmitting layer.

[0015] The present invention also proposes a photovoltaic module, including the aforementioned light-converting black-looking shielding film.

[0016] Preferably, the shielding film is located around the photovoltaic module, directly above the gaps between the cells and / or between the cell strings.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The shielding film of the present invention includes a substrate layer, a black infrared-transmitting layer located on one side of the substrate layer, and a light conversion layer; The black infrared-transmitting layer has infrared transmission capability. When used in conjunction with the substrate layer, it can block the busbars or solder strips while reflecting the transmitted infrared light through the back panel. It can also enable the solar cells to absorb infrared light, thereby improving the power generation of photovoltaic modules and reducing the problem of reduced power generation efficiency of photovoltaic modules caused by partial shading of solar cells due to layout issues. The light conversion layer can convert ultraviolet-visible light into infrared light and rely on the back sheet for reflection. This is equivalent to reflecting the ultraviolet-visible light (excluding infrared light) from the sunlight between the photovoltaic modules back onto the solar cells and being absorbed by the silicon wafers to generate electricity, thus increasing the utilization rate of the light source.

[0018] Compared to a completely light-blocking black polymer film, the shielding film described in this invention does not cause a temperature rise because infrared light is allowed to pass through, thus exhibiting superior temperature resistance and insulation properties. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a structure of the light-converting black appearance masking film described in this invention; Figure 2This is a schematic diagram of another structure of the light-converting black appearance masking film described in this invention; Figure 3 This is a schematic diagram of the structure of the light-converting black appearance shielding film of the present invention used in photovoltaic modules. Detailed Implementation

[0020] Reference Figure 1 The present invention provides a light-converting black appearance shielding film, comprising: a substrate layer; a black infrared-transmitting layer located on the surface of the substrate layer for giving the shielding film a black appearance and allowing infrared light to pass through; and a visible light conversion layer located on the surface of the black infrared-transmitting layer away from the substrate layer for converting ultraviolet-visible light into infrared light.

[0021] In a specific embodiment, the substrate layer is a transparent substrate layer, which can be a PI film layer or a PET film layer, and its thickness is generally 10-200μm.

[0022] In a specific embodiment, the black infrared-transmitting layer has a transmittance of ≥90% for near-infrared light in the 780-1300nm band, a color difference index L value of 22-26, a value of 0±5, and b value of 0±5; the thickness of the black infrared-transmitting layer is 5-15μm.

[0023] In a specific embodiment, the black infrared-transmitting layer is formed by coating an organic coating containing black infrared-transmitting organic pigments; the black infrared-transmitting organic pigments include perylene black pigments (black paste); in addition to perylene black pigments, perylene red / blue / yellow pigments may also be included, and the a and b values ​​are adjusted respectively to correct the green, yellow and blue hues of the color.

[0024] In this invention, the black infrared-transmitting layer is used to obtain a black appearance while allowing infrared light to pass through. Perylene black pigment is used as the main dye to adjust the color, preferably with a small amount of perylene red / blue / yellow pigments to adjust the hue, and titanium black pigment is added to increase the direct reflectivity.

[0025] In a specific embodiment, the organic coating used in the black infrared transparent layer includes component A and component B with a mass ratio of 100:10-30; component A includes, by weight: 15-30 parts of hydroxyl resin, 25-35 parts of black infrared transparent organic pigment, 1-5 parts of additives, and 10-25 parts of solvent; component B includes, by weight: 5-15 parts of isocyanate curing agent and 5-15 parts of solvent.

[0026] Hydroxyl resins can be polyester polyols / hydroxyl acrylic resins, etc., with hydroxyl values ​​of 25-70; black infrared-transmitting organic pigments include perylene black pigments, perylene red / blue / yellow pigments, and titanium black pigments; isocyanate curing agents include HDI, IPDI, HMDI, etc.; solvents include ethyl acetate, propyl acetate, butyl acetate, cyclohexanone, propylene glycol methyl ether, etc.; and additives include coupling agents, dispersants, anti-sticking agents, defoamers, leveling agents, and curing accelerators.

[0027] In this invention, the black infrared-transparent layer can be formed by the following method: the raw materials of the organic coating used for the black infrared-transparent layer are mixed at high speed and applied to the surface of the substrate layer, and cured at 100-150°C for 2-4 minutes to allow the solvent to evaporate and a thermosetting reaction to occur, thereby forming the black infrared-transparent layer.

[0028] In a specific embodiment, the visible light conversion layer can convert ultraviolet-visible light in the 300-700nm band into near-infrared light in the 780-1300nm band, and the transmittance of near-infrared light in the 780-1300nm band is ≥95%; the thickness of the visible light conversion layer is 5-10μm.

[0029] In a specific embodiment, the visible light conversion layer is formed by coating an organic coating containing an infrared light converter; the infrared light converter includes Cr. 3+ Ion-activated Na3Al2(PO4)2F3 phototransfer agent.

[0030] In this invention, the visible light conversion layer is used to convert ultraviolet-visible light into infrared light and transmit it through the infrared light source, using Cr. 3+ Ion-activated Na3Al2(PO4)2F3 light transfer agent is used as an additive. This light transfer agent has multiple excitation peaks in the 300-780nm wavelength range, and the absorption-excitation peaks cover the ultraviolet-visible wavelength range. The optimal excitation peaks are located at 426nm and 640nm. It can emit near-infrared light in the 780-1300nm range, with an emission peak at 810nm and a full width at half maximum (FWHM) of 150nm. It also has good high-temperature decay resistance and can maintain 98% of the room temperature luminescence intensity at 150℃.

[0031] In a specific embodiment, the organic coating used in the visible light conversion layer includes component A and component B in a mass ratio of 100:30-50; component A includes, by weight, 20-40 parts of hydroxyl resin, Cr 3+ The components are: 0.05-1.5 parts of ion-activated Na3Al2(PO4)2F3 phototransfer agent, 2-8 parts of additives, and 20-35 parts of solvent; component B includes, by weight: 10-20 parts of isocyanate curing agent and 15-25 parts of solvent.

[0032] Hydroxyl resins can also be polyester polyols / hydroxyl acrylic resins, etc., with hydroxyl values ​​of 25-70; infrared light transfer agents include Cr 3+ Ion-activated Na3Al2(PO4)2F3 phototransfer agent; organic pigments including perylene red / blue / yellow pigments; curing agents such as isocyanates; solvents such as ethyl acetate, propyl acetate, butyl acetate, cyclohexanone, propylene glycol methyl ether, etc.; and additives such as coupling agents, dispersants, anti-sticking agents, defoamers, leveling agents, and curing accelerators. In this invention, the visible light conversion layer can be formed by the following method: the raw materials of the organic coating used in the visible light conversion layer are mixed at high speed and then coated on the surface of the black infrared transparent layer or the substrate layer. The mixture is cured at 100-150°C for 2-4 minutes to allow the solvent to evaporate and a thermosetting reaction to occur, thereby forming the visible light conversion layer.

[0033] In a specific embodiment, the shielding film further includes an adhesive layer located on the surface of the light conversion layer away from the black infrared-transmitting layer, for bonding the shielding film to the front panel of the photovoltaic module.

[0034] In a specific embodiment, the adhesive layer is an EVA layer, a POE layer, or an EPE layer; the thickness of the adhesive layer is 30-200 μm.

[0035] Reference Figure 2 The present invention also provides a light-converting black appearance shielding film, comprising: a substrate layer; a black infrared-transmitting layer located on the surface of the substrate layer for giving the shielding film a black appearance and allowing infrared light to pass through; and a visible light conversion layer located on the surface of the substrate layer away from the black infrared-transmitting layer for converting ultraviolet-visible light into infrared light.

[0036] This invention also proposes a method for preparing the above-mentioned light-converting black appearance masking film, comprising: Provide a substrate layer; Specifically, the substrate layer is a transparent substrate layer, which can be a PI film layer or a PET film layer; A black infrared-transmitting layer is formed on the surface of the substrate layer; Specifically, an organic coating containing black infrared-transmitting organic pigments is applied to the surface of the substrate layer, and after curing, a black infrared-transmitting layer is formed. A visible light conversion layer is formed on the surface of the black infrared-transmitting layer away from the substrate layer or on the surface of the substrate layer away from the black infrared-transmitting layer; Specifically, an organic coating containing an infrared light transfer agent is applied to the surface of the black infrared-transmitting layer away from the substrate layer or to the surface of the substrate layer away from the black infrared-transmitting layer, and a light conversion layer is formed after curing. In a specific embodiment, an adhesive layer is also formed on the surface of the visible light conversion layer away from the black infrared-transmitting layer; Specifically, EVA / POE / EPE particles are coated onto the surface of the visible light conversion layer using a coating machine to form an adhesive layer.

[0037] The present invention also includes cutting the masking film into the designed width and length using a slitting machine and then rolling it up.

[0038] Reference Figure 3 The present invention also proposes a photovoltaic module, including the above-mentioned light conversion black appearance shielding film 16; In a specific embodiment, the photovoltaic module includes a front panel 11, a shielding film 16, a front encapsulation material layer 12, a solar cell 13, a rear encapsulation material layer 14, and a back panel 15, which are stacked sequentially from top to bottom. The shielding film 16 is located directly above the gap between the battery cells 13.

[0039] In a specific embodiment, the shielding film may also be located around the photovoltaic module, directly above the gaps between cells and / or between cell strings, and may be placed on the lower surface of the front panel or the surface of the photovoltaic module busbar / strip.

[0040] In this invention, the shielding film includes a substrate layer, a black infrared-transmitting layer located on one side of the substrate layer, and a light conversion layer. The black infrared-transmitting layer has infrared transmission capability. In conjunction with the substrate layer, it not only blocks the busbars or solder strips but also reflects the transmitted infrared light using the backsheet. This also allows the solar cells to absorb infrared light, thereby increasing the power generation of the photovoltaic module and reducing the problem of reduced photovoltaic module power generation efficiency caused by partial solar cell shading due to layout issues. The light conversion layer converts ultraviolet-visible light into infrared light and relies on the backsheet for reflection. This is equivalent to reflecting the ultraviolet-visible light (excluding infrared light) from the sunlight between the photovoltaic modules back onto the solar cells and having it absorbed by the silicon wafer for power generation, increasing the utilization rate of the light source. Furthermore, compared to a completely light-blocking black polymer film, the shielding film of this invention does not cause a temperature increase because infrared light is transmitted, thus exhibiting superior temperature resistance and insulation properties.

[0041] Example 1

[0042] This invention provides a light-converting black appearance masking film, which is specifically prepared through the following steps: (1) Provide a transparent substrate layer, which is a PI film layer with a thickness of 100μm; (2) An organic coating is applied to the above transparent substrate layer. The organic coating includes component A and component B. Component A includes, by weight: 22 parts of polyester polyol (polycarbonate diol, molecular weight 1500, hydroxyl value 56 mg KOH / g), 30 parts of perylene black (BASF L0086), 0.5 parts of silane coupling agent (KH-570), 0.1 parts of curing accelerator (dibutyltin dilaurate), 1.5 parts of defoamer (BYK-141), 0.5 parts of leveling agent (BYK-333), 10 parts of solvent (ethyl acetate), and 6 parts of solvent (butyl acetate). Component B includes, by weight: 7 parts of hexamethylene diisocyanate (HDI) and 10 parts of solvent (acetylacetone). After curing at 120°C for 3 min, a black infrared transparent layer with a thickness of 10 μm is formed. (3) An organic coating is applied to the surface of the above-mentioned black infrared-transparent layer away from the transparent substrate layer. The organic coating includes component A and component B. Component A includes, by weight, 34 parts of polyester polyol (polycarbonate diol, molecular weight 1500, hydroxyl value 56 mg KOH / g), Cr 3+ The composition consists of: 0.1 parts of ion-activated Na3Al2(PO4)2F3 light conversion agent, 0.8 parts of silane coupling agent (KH-570), 0.2 parts of curing accelerator (dibutyltin dilaurate), 3 parts of defoamer (BYK-141), 1 part of leveling agent (BYK-333), 17 parts of solvent (ethyl acetate), and 10 parts of solvent (butyl acetate); Component B by weight includes: 12 parts of hexamethylene diisocyanate (HDI) and 20 parts of solvent (acetylacetone); cured at 150℃ for 2 min to form a visible light conversion layer with a thickness of 8 μm. (4) EVA particles are coated on the surface of the light conversion layer away from the black infrared transparent layer to form an EVA adhesive layer with a thickness of 100 μm.

[0043] Example 2 This invention provides a light-converting black appearance masking film, which is specifically prepared through the following steps: (1) Provide a transparent substrate layer, which is a PI film layer with a thickness of 100μm; (2) An organic coating is applied to the above transparent substrate layer. The organic coating includes component A and component B. Component A includes, by weight: 22 parts of polyester polyol (polycarbonate diol, molecular weight 1500, hydroxyl value 56 mg KOH / g), 30 parts of perylene black (BASF L0086), 0.5 parts of silane coupling agent (KH-570), 0.1 parts of curing accelerator (dibutyltin dilaurate), 1.5 parts of defoamer (BYK-141), 0.5 parts of leveling agent (BYK-333), 10 parts of solvent (ethyl acetate), and 6 parts of solvent (butyl acetate). Component B includes, by weight: 7 parts of hexamethylene diisocyanate (HDI) and 10 parts of solvent (acetylacetone). After curing at 120°C for 3 min, a black infrared transparent layer with a thickness of 10 μm is formed. (3) An organic coating is applied to the surface of the above-mentioned transparent substrate layer away from the black infrared-transmitting layer. The organic coating includes component A and component B. Component A includes, by weight, 34 parts of polyester polyol (polycarbonate diol, molecular weight 1500, hydroxyl value 56 mg KOH / g), Cr 3+The composition consists of: 0.1 parts of ion-activated Na3Al2(PO4)2F3 light conversion agent, 0.8 parts of silane coupling agent (KH-570), 0.2 parts of curing accelerator (dibutyltin dilaurate), 3 parts of defoamer (BYK-141), 1 part of leveling agent (BYK-333), 17 parts of solvent (ethyl acetate), and 10 parts of solvent (butyl acetate); Component B by weight includes: 12 parts of hexamethylene diisocyanate (HDI) and 20 parts of solvent (acetylacetone); cured at 150℃ for 2 min to form a visible light conversion layer with a thickness of 8 μm. (4) EVA particles are coated on the surface of the light conversion layer away from the black infrared transparent layer to form an EVA adhesive layer with a thickness of 100 μm. Comparative Example 1 This invention provides a black appearance masking film, which is specifically prepared through the following steps: (1) Provide a transparent substrate layer, which is a PI film layer with a thickness of 100μm; (2) An organic coating is applied to the above transparent substrate layer. The organic coating includes component A and component B. Component A includes, by weight: 22 parts of polyester polyol (polycarbonate diol, molecular weight 1500, hydroxyl value 56 mg KOH / g), 30 parts of perylene black (BASF L0086), 0.5 parts of silane coupling agent (KH-570), 0.1 parts of curing accelerator (dibutyltin dilaurate), 1.5 parts of defoamer (BYK-141), 0.5 parts of leveling agent (BYK-333), 10 parts of solvent (ethyl acetate), and 6 parts of solvent (butyl acetate). Component B includes, by weight: 7 parts of hexamethylene diisocyanate (HDI) and 10 parts of solvent (acetylacetone). After curing at 120°C for 3 min, a black infrared transparent layer with a thickness of 10 μm is formed. (3) EVA particles are coated on the surface of the above-mentioned black infrared transparent layer away from the transparent substrate layer using a coating machine to form an adhesive layer with a thickness of 100μm. The black-faced shielding film described in the above embodiments and comparative examples is used in photovoltaic modules. The shielding film is placed on the front panel and corresponds to the gap area between two adjacent solar cells. The gap width is 3mm, and the width of the shielding film is slightly larger than the gap width. The photovoltaic module is placed in a dark room environment, and the emitted light penetrates the front glass to illuminate the surface of the shielding film at 1000W / m 2 Tested under AM1.5 spectrum, compared with the component with black appearance masking film described in Comparative Example 1, Examples 1 and 2 have an average power gain of 0.15% and 0.24%, respectively.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A light-converting black appearance masking film, comprising: Substrate layer; A black infrared-transmitting layer is located on the surface of the substrate layer to give the shielding film a black appearance and allow infrared light to pass through. A visible light conversion layer is located on the surface of the black infrared-transmitting layer away from the substrate layer or on the surface of the substrate layer away from the black infrared-transmitting layer, and is used to convert ultraviolet-visible light into infrared light.

2. The light-converting black appearance masking film according to claim 1, characterized in that, The substrate layer is a PI film layer or a PET film layer; Preferably, the thickness of the substrate layer is 10-200 μm.

3. The light-converting black appearance masking film according to claim 1 or 2, characterized in that, The black infrared-transmitting layer has a transmittance of ≥90% for near-infrared light in the 780-1300nm band; the color difference index L value is 22-26, a value is 0±5, and b value is 0±5. Preferably, the thickness of the black infrared-transmitting layer is 5-15 μm.

4. The light-converting black appearance masking film according to claim 3, characterized in that, The black infrared-transmitting layer is formed by coating with an organic paint containing black infrared-transmitting organic pigments; Preferably, the black infrared-transmitting organic pigment includes perylene black pigment; Preferably, the organic coating comprises component A and component B in a mass ratio of 100:10-30; component A comprises, by weight: 15-30 parts of hydroxyl resin, 25-35 parts of black infrared-transmitting organic pigment, 1-5 parts of additives, and 10-25 parts of solvent; component B comprises, by weight: 5-15 parts of isocyanate curing agent and 5-15 parts of solvent.

5. The light-converting black appearance masking film according to any one of claims 1-4, characterized in that, The visible light conversion layer converts ultraviolet-visible light in the 300-700nm band into near-infrared light in the 780-1300nm band. Preferably, the thickness of the visible light conversion layer is 5-10 μm.

6. The light-converting black appearance masking film according to claim 5, characterized in that, The light conversion layer is formed by coating an organic coating containing an infrared light converter; Preferably, the infrared light converter includes Cr. 3+ Ion-activated Na3Al2(PO4)2F3 phototransfer agent; Preferably, the organic coating comprises component A and component B in a mass ratio of 100:30-50; component A comprises, by weight: 20-40 parts of hydroxyl resin, Cr 3+ The components are: 0.05-1.5 parts of ion-activated Na3Al2(PO4)2F3 phototransfer agent, 2-8 parts of additives, and 20-35 parts of solvent; component B includes, by weight: 10-20 parts of isocyanate curing agent and 15-25 parts of solvent.

7. The light-converting black appearance masking film according to any one of claims 1-6, characterized in that, The shielding film also includes an adhesive layer located on the surface of the visible light conversion layer away from the black infrared-transmitting layer, for bonding the shielding film to the photovoltaic module; Preferably, the adhesive layer is an EVA layer, a POE layer, or an EPE layer; Preferably, the thickness of the adhesive layer is 30-200 μm.

8. A method for preparing the light-converting black appearance masking film according to any one of claims 1-7, characterized in that, include: Provide a substrate layer A black infrared-transmitting layer is formed on the surface of the substrate layer; A light conversion layer is formed on the surface of the black infrared-transmitting layer away from the substrate layer or on the surface of the substrate layer away from the black infrared-transmitting layer.

9. A photovoltaic module, characterized in that, Includes the light-converting black appearance masking film according to any one of claims 1-7.

10. The photovoltaic module according to claim 9, characterized in that, The shading film is located around the photovoltaic module, directly above the gaps between the cells and / or between the cell strings.

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