Broadband infrared penetration type perylene black pigment and infrared high-reflection black adhesive film
By introducing methoxytoluene groups onto perylene-based black pigments and carrying out a grafting reaction, the discoloration problem of high-reflectivity black encapsulating films during the aging process in photovoltaic modules was solved, achieving better dispersibility and stability, and improving light absorption and reflection performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-03-13
AI Technical Summary
Existing high-reflectivity black encapsulating films are prone to discoloration on the back of photovoltaic modules during the aging process, leading to migration and discoloration.
A perylene-based black pigment with wide-band infrared penetration is used. By introducing methoxytoluene groups on both sides of the perylene-based black pigment and performing grafting anti-color migration treatment, it forms a stable chemical bond with the encapsulating film polymer, thereby enhancing the anti-migration ability.
It improves the dispersibility and stability of the film, prevents discoloration on the back of the component during aging, maintains a pure black appearance, and enhances light absorption and reflection properties.
Smart Images
Figure CN121652152A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of photovoltaic module technology, specifically relating to a wide-band infrared-transmitting perylene-based black pigment and an infrared-high reflective black film. Background Technology
[0002] Currently, most photovoltaic encapsulation films on the market are transparent or white. While these meet some encapsulation requirements, the demand for black encapsulation films is increasingly urgent in specific application scenarios such as building-integrated photovoltaics (BIPV) to achieve aesthetic appeal and harmony with the building's appearance. Infrared-high reflective black encapsulation films not only help photovoltaic modules integrate better with the building's exterior but also reduce light pollution and decrease the module's heat load, demonstrating significant application potential.
[0003] Infrared high-reflectivity black photovoltaic modules are increasingly widely used in the market due to their significant advantages such as higher power generation efficiency and aesthetic appeal. However, currently available high-reflectivity black encapsulating films exhibit discoloration on the back of the modules after aging during actual application.
[0004] Therefore, overcoming the migration and discoloration problem caused by black fillers in highly reflective black encapsulating films is a technical problem that urgently needs to be solved in this field.
[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention
[0006] This disclosure provides at least one broadband infrared-transmitting perylene-based black pigment and an infrared-high reflective black film.
[0007] In a first aspect, embodiments of this disclosure provide a broadband infrared-transmitting perylene-based black pigment, the molecular structure of which is shown below: Formula-I Wherein, R is any one of silyl group, siloxane group, and group containing unsaturated bonds; The silane group has the structural formula –(CH2). n –SiR 1 3; where R 1 Selected from H or C 1-6 Alkyl or substituted alkyl groups, n=0~6; the structural formula of the siloxane group is –(CH2). n –Si–(OR 2 )3; where R 2 Independently for C 1-6 Alkyl or substituted alkyl groups, n=0~6; the structural formula of the group containing the unsaturated bond is -(CH2).n -R 3 Among them, R 3 Independently for C 2-6 Alkenyl, n=0~6.
[0008] In one alternative embodiment, its molecular structure is shown below: Formula II.
[0009] In one alternative embodiment, its molecular structure is shown below: Formula III.
[0010] In one alternative embodiment, its molecular structure is shown below: Formula-Ⅳ.
[0011] Secondly, this disclosure also provides a method for preparing a broadband infrared-transmitting perylene-based black pigment as described above, comprising the following steps: S1, adding anhydrous solvent to a reaction vessel under a dry nitrogen atmosphere, weighing perylene tetracarboxylic dianhydride and... Add the product to the solution and stir until fully dissolved to form a homogeneous solution; S2, heat the reaction vessel at 80-180℃ with a heating rate of 2-5℃ / min, and wash the product through a column to obtain target product 1 containing unsaturated bonds; S3, add target product 1 and siloxane / silane reagent to anhydrous solvent, catalyze the reaction, and heat the reaction at 80-180℃ to obtain target product 2, which is a broadband infrared penetrant perylene-based black pigment.
[0012] Thirdly, this disclosure also provides an infrared high-reflectivity black adhesive film, which is a co-extruded double-layer adhesive film, comprising: a black reflective layer and a white high-reflectivity layer; the black reflective layer comprises at least one perylene-based black pigment and an organic polymer material having the broadband infrared penetration type as described above; the white high-reflectivity layer comprises at least one infrared high-reflectivity filler and an organic polymer material.
[0013] In one optional embodiment, the thickness of the infrared high reflectivity black film is 20–1000 μm; the thickness of the black reflectivity layer is 10–990 μm, and the mass percentage of the broadband infrared penetrating perylene black pigment is 0.01–2 wt%; the thickness of the white high reflectivity layer is 10–990 μm.
[0014] In one optional embodiment, the organic polymer material includes any one or more combinations of thermoplastic polyolefins, polyvinyl butyral, polyolefin elastomers, polyurethanes, thermoplastic polyurethanes, polyacrylates, ethylene vinyl acetate copolymers, organosilicon, and EAA ionomers.
[0015] In one optional embodiment, the black reflective layer comprises the following components by weight: 100 parts organic polymer material, 0.01-2 parts broadband infrared-transmitting perylene-based black pigment, 0.5-2 parts initiator, 0.01-1 part light stabilizer, 0.1-2 parts crosslinking agent, 0.1-1 part co-crosslinking agent, 0.01-1 part antioxidant, 0.01-1 part ultraviolet absorber, and 0.1-1.2 parts silane coupling agent; the white high-reflectivity layer comprises the following components by weight: 100 parts organic polymer material, 8-20 parts high-reflectivity filler, 0.5-2 parts initiator, 0.01-1 part light stabilizer, 0.1-2 parts crosslinking agent, 0.1-1 part co-crosslinking agent, 0.01-1 part antioxidant, and 0.1-1.2 parts silane coupling agent.
[0016] Fourthly, this disclosure also provides a photovoltaic module, wherein the photovoltaic module comprises, from top to bottom, glass, a first encapsulating film, a solar cell, a second encapsulating film, and a backsheet or glass; wherein the second encapsulating film is the infrared high-reflectivity black film described above.
[0017] In one alternative embodiment, the black reflective layer of the infrared high-reflectivity black film is in contact with the battery cell, and the white high-reflectivity layer is in contact with the back panel or glass of the component. The black reflective layer partially reflects the light passing through the gap between the batteries, and the white high-reflectivity layer reflects the light passing through the black reflective layer.
[0018] The beneficial effects of this invention are as follows: This broadband infrared-transmitting perylene-based black pigment and infrared-high reflective black film utilize a perylene derivative with a methoxytoluene group on each side, resulting in a greenish-black appearance. Simultaneously, the perylene-based black pigment undergoes grafting anti-migration treatment. The perylene-based black pigment contains unsaturated bonds or unsaturated bonds and silane-containing anti-migration groups. Under the action of an initiator, a grafting reaction occurs, forming a stable chemical bond with the encapsulating film polymer. The grafted perylene-based black pigment exhibits better dispersion in the film and significantly enhanced anti-migration ability. The perylene-based black pigment itself possesses excellent lightfastness, heat resistance, and chemical stability. Its unique molecular structure ensures uniform dispersion in the film. Furthermore, it imparts a stable and pure black appearance to the film. Compared to traditional black pigments, it has advantages in light absorption and reflection characteristics, contributing to improved overall film performance.
[0019] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.
[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0022] Figure 1 A cross-sectional view of the photovoltaic encapsulant film in Embodiment 1 provided in this disclosure, taken under a microscope; Figure 2 A reflectance curve of the photovoltaic film of Example 1 provided in this disclosure; Figure 3 The actual images of the back side of the component boards of Embodiments 1, 2, 3 and the comparative examples provided for the present disclosure after aging in a PCT aging chamber for 96 hours are shown. Figure 4 The images show the back appearance of the photovoltaic modules of Examples 1, 2 and the comparative examples provided in this disclosure after aging in a damp heat aging chamber for 2000 hours. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.
[0025] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.
[0026] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.
[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0028] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0029] This disclosure provides a broadband infrared-transmitting perylene-based black pigment, the molecular structure of which is shown below: Formula-I Wherein, R is any one of silyl group, siloxane group, and group containing unsaturated bonds; The silane group has the structural formula –(CH2). n –SiR 1 3; where R 1 Selected from H or C 1-6 Alkyl or substituted alkyl groups, n=0~6; the structural formula of the siloxane group is –(CH2). n –Si–(OR 2 )3; where R 2 Independently for C 1-6 Alkyl or substituted alkyl groups, n=0~6; the structural formula of the group containing the unsaturated bond is -(CH2). n -R 3 Among them, R 3 Independently for C2-6 Alkenyl, n=0~6.
[0030] Specifically, C 1-6 The alkyl group is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, n-pentyl, isopentyl, neopentyl, n-hexyl, or isohexyl.
[0031] In some embodiments, specifically, the molecular structure is shown below: Formula II.
[0032] In some embodiments, specifically, the molecular structure is shown below: Formula III.
[0033] In some embodiments, specifically, the molecular structure is shown below: Formula-Ⅳ.
[0034] This disclosure also provides a method for preparing a broadband infrared-transmitting perylene-based black pigment as described above, comprising the following steps: S1, adding anhydrous solvent to a reaction vessel under a dry nitrogen atmosphere, weighing perylene tetracarboxylic dianhydride and... Add the product to the solution and stir until fully dissolved to form a homogeneous solution; S2, heat the reaction vessel at 80-180℃ with a heating rate of 2-5℃ / min, and wash the product through a column to obtain target product 1 containing unsaturated bonds; S3, add target product 1 and siloxane / silane reagent to anhydrous solvent, catalyze the reaction, and heat the reaction at 80-180℃ to obtain target product 2, which is a broadband infrared penetrant perylene-based black pigment.
[0035] This disclosure also provides an infrared high-reflectivity black adhesive film, which is a co-extruded double-layer adhesive film comprising: a black reflective layer and a white high-reflectivity layer; the black reflective layer comprises at least one perylene-based black pigment and an organic polymer material having the aforementioned broadband infrared penetration type; the white high-reflectivity layer comprises at least one infrared high-reflectivity filler and an organic polymer material.
[0036] In some embodiments, specifically, the thickness of the infrared high reflectivity black film is 20–1000 μm; the thickness of the black reflectivity layer is 10–990 μm, and the mass percentage of the broadband infrared penetrating perylene black pigment is 0.01–2 wt%; the thickness of the white high reflectivity layer is 10–990 μm.
[0037] In some embodiments, specifically, the organic polymer material includes any one or more combinations of thermoplastic polyolefins, polyvinyl butyral, polyolefin elastomers, polyurethanes, thermoplastic polyurethanes, polyacrylates, ethylene vinyl acetate copolymers, organosilicon, and EAA ionomers.
[0038] In some embodiments, specifically, the black reflective layer comprises the following components by weight: 100 parts organic polymer material, 0.01-2 parts broadband infrared-transmitting perylene-based black pigment, 0.5-2 parts initiator, 0.01-1 parts light stabilizer, 0.1-2 parts crosslinking agent, 0.1-1 parts co-crosslinking agent, 0.01-1 parts antioxidant, 0.01-1 parts ultraviolet absorber, and 0.1-1.2 parts silane coupling agent; the white high-reflectivity layer comprises the following components by weight: 100 parts organic polymer material, 8-20 parts high-reflectivity filler, 0.5-2 parts initiator, 0.01-1 parts light stabilizer, 0.1-2 parts crosslinking agent, 0.1-1 parts co-crosslinking agent, 0.01-1 parts antioxidant, and 0.1-1.2 parts silane coupling agent.
[0039] This disclosure also provides a photovoltaic module, wherein the photovoltaic module comprises, from top to bottom, a first glass, a first encapsulating film, a solar cell, a second encapsulating film, and a backsheet or glass; wherein the second encapsulating film is the infrared high-reflectivity black film described above.
[0040] In some embodiments, specifically, the black reflective layer of the infrared high-reflectivity black film is in contact with the battery cell, and the white high-reflectivity layer is in contact with the back panel or glass of the component. The black reflective layer partially reflects the light passing through the gap between the batteries, and the white high-reflectivity layer reflects the light passing through the black reflective layer. During lamination, a grafting reaction is carried out under the action of a perylene-based black pigment initiator to form a stable chemical bond with the encapsulating film polymer, forming a stable network structure.
[0041] Example 1: The preparation process of infrared-transmitting perylene-based black pigment is as follows:
[0042] Air was removed from the flask and nitrogen was introduced. 60 mL of toluene was added, followed by the slow addition of perylene tetracarboxylic dianhydride (PTCDA, 1.0 mmol, 393 mg) and reagent a (2.2 mmol, 358 mg). The mixture was heated to 110 °C and refluxed for 12 h. Toluene was removed by rotary evaporation, and a small amount of dichloromethane was added to dissolve the product. The polarity was determined by TLC, followed by column chromatography. The polarity of the eluent was selected using a 2:1 ratio of dichloromethane to petroleum ether. The solvent was evaporated to dryness, yielding the crude product. A small amount of dichloromethane was then added to the crude product, dissolved completely, and poured into a large volume of methanol solution. The mixture was allowed to stand until a precipitate formed. The precipitate was then filtered and washed with methanol to obtain 513 mg of compound a, with a yield of 75%.
[0043] Specifically, infrared high-reflectivity black adhesive films include: The black layer, by weight, comprises: 100 parts ethylene-vinyl acetate; 1.0 part tert-butylperoxide-2-ethylhexyl carbonate as initiator; 0.3 parts bis(2,2,6,6-tetramethylpiperidinyl) sebacate as light stabilizer; 0.5 parts trimethylolpropane trimethacrylate as crosslinking agent; 0.5 parts triallyl isocyanurate as co-crosslinking agent; 0.5 parts β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl alcohol as antioxidant; 0.7 parts 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)benzotriazole as UV absorber; 0.8 parts γ-methacryloyloxypropyltrimethoxysilane as silane coupling agent; and 1.0 part compound a as perylene black pigment.
[0044] White layer, by weight: 100 parts ethylene-vinyl acetate; 1.0 part tert-butylperoxide-2-ethylhexyl carbonate as initiator; 0.3 parts bis(2,2,6,6-tetramethylpiperidinyl) sebacate as light stabilizer; 0.5 parts trimethylolpropane trimethacrylate as crosslinking agent; 0.5 parts triallyl isocyanurate as co-crosslinking agent; 0.5 parts β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate octadecyl alcohol as antioxidant; 0.8 parts γ-methacryloyloxypropyltrimethoxysilane as silane coupling agent; and 12 parts titanium dioxide as infrared high reflectance filler.
[0045] According to the weight composition of the film, the materials are taken out and mixed evenly using an automatic mixer. The material of the black layer is added to the feeding port of screw A of the extruder, and the material of the white layer is extruded to the feeding port of screw B of the extruder. The mixture is heated, melted, filtered, and flows through a distributor to the die head of the extruder for casting, embossing, cooling, slitting, winding, and irradiation post-treatment to prepare an infrared high reflective black EVA encapsulation film with co-extruded black and white layers.
[0046] The components are assembled from top to bottom in the following order: glass, ordinary EPE encapsulating film, infrared high-reflectivity black film, and backsheet or glass. After lamination, they are manufactured into a module.
[0047] Example 2: The preparation process of infrared-transmitting perylene-based black pigment is as follows: Under a nitrogen atmosphere, 342 mg (0.5 mmol) of compound a, 145 mg (reagent c, 1.2 mmol) of trimethoxysilane, 5 μL of Karstedt catalyst, and dry toluene were used as solvents. The mixture was stirred at room temperature for 10 min, then heated to 110 °C and refluxed for 3 h. After cooling to room temperature, toluene was removed by rotary evaporation, and a small amount of dichloromethane was added to dissolve the compound. The polarity was determined by TLC, followed by column chromatography. The polarity of the eluent was selected as 3:2 (dichloromethane to petroleum ether). The solvent was evaporated to dryness to obtain the crude product. The crude product was then fully dissolved in a small amount of dichloromethane and poured into a large amount of methanol solution. After standing, the precipitate was allowed to form. The upper layer was almost colorless. The precipitate was filtered and washed with methanol. The resulting red solid was dried overnight in a vacuum oven to obtain 323 mg of compound b, with a yield of 70%.
[0048] Photovoltaic modules were prepared using the same method as in Example 1, except that the perylene black pigment was 1.0 part of compound b.
[0049] Example 3: The preparation process of infrared-transmitting perylene-based black pigment is as follows: Under a nitrogen atmosphere, 342 mg (0.5 mmol) of compound a, 87 mg (reagent c, 1.2 mmol) of trimethoxysilane, 5 μL of Karstedt catalyst, and dry toluene were used as solvents. The mixture was stirred at room temperature for 10 min, then heated to 110 °C and refluxed for 3 h. After cooling to room temperature, toluene was removed by rotary evaporation, and a small amount of dichloromethane was added to dissolve the product. The polarity was determined by TLC, followed by column chromatography. The polarity of the eluent was selected as 3:2 (dichloromethane to petroleum ether). The solvent was evaporated to dryness to obtain the crude product. The crude product was then fully dissolved in a small amount of dichloromethane and poured into a large amount of methanol solution. After standing, the precipitate was collected, filtered, and washed with methanol. The resulting red solid was dried overnight in a vacuum oven to obtain 291 mg of compound c, with a yield of 70%.
[0050] Photovoltaic modules were prepared using the same method as in Example 1, except that the perylene black pigment was 1.0 part of compound c.
[0051] Comparative example: Compared with Example 1, the difference is that 1.0 part of ordinary perylene black pigment was used.
[0052] like Figure 1 As shown, Figure 1This is a cross-sectional view under a microscope of the cross section of the high-reflectivity black adhesive film laminated according to Embodiment 1 of this disclosure.
[0053] like Figure 2 As shown, Figure 2 The reflection curve of the photovoltaic film of Example 1 provided in this disclosure.
[0054] like Figure 3 As shown, Figure 3 The images show the back appearance of the component boards of Examples 1, 2, 3 and the comparative examples provided in this disclosure after aging in a PCT aging chamber for 96 hours. After aging, the back edge of the comparative example component board has obvious pink color, the edge of Example 1 has only very light pink color, and no pink color precipitation occurred on the back of Examples 2 and 3. It can be seen that the perylene black pigment has obvious anti-aging color migration effect after modification.
[0055] like Figure 4 As shown, Figure 4 The images show the back appearance of the photovoltaic modules of Examples 1, 2 and Comparative Example 1 after aging in a damp heat aging chamber for 2000 hours, as provided in the embodiments of this disclosure. After aging, the comparative example module showed obvious pinkish material precipitation on the back, while the modules of Examples 1 and 2 showed almost no red material precipitation at the edges. It can be seen that the perylene black pigment has obvious anti-aging color migration effect after modification.
[0056] In summary, this broadband infrared-transmitting perylene-based black pigment and infrared-high reflective black film utilize a perylene derivative with a methoxytoluene group on each side, resulting in a greenish-black appearance. Furthermore, the perylene-based black pigment undergoes grafting anti-migration treatment. This pigment contains unsaturated bonds or unsaturated bonds and silane-based anti-migration groups, which undergo a grafting reaction under the action of an initiator to form stable chemical bonds with the encapsulating film polymer. The grafted perylene-based black pigment exhibits better dispersibility in the film and significantly enhanced anti-migration ability. The perylene-based black pigment itself possesses excellent lightfastness, heat resistance, and chemical stability. Its unique molecular structure ensures uniform dispersion in the film. In addition, it imparts a stable and pure black appearance to the film and, compared to traditional black pigments, offers superior light absorption and reflection characteristics, contributing to improved overall film performance.
[0057] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. A broadband infrared-transmitting perylene-based black pigment, characterized in that, Its molecular structure is shown below: Formula-I Wherein, R is any one of silyl group, siloxane group, and group containing unsaturated bonds; The silane group has the structural formula –(CH2). n –SiR 1 3; where R 1 Selected from H or C 1-6 Alkyl or substituted alkyl, n=0~6; The siloxane has the structural formula –(CH2). n –Si–(OR 2 )3; where R 2 Independently for C 1-6 Alkyl or substituted alkyl, n=0~6; The structural formula of the group containing the unsaturated bond is -(CH2). n -R 3 Among them, R 3 Independently for C 2-6 Alkenyl, n=0~6.
2. The broadband infrared-transmitting perylene-based black pigment as described in claim 1, characterized in that, Its molecular structure is shown below: Formula II.
3. The broadband infrared-transmitting perylene-based black pigment as described in claim 1, characterized in that, Its molecular structure is shown below: Formula III.
4. The broadband infrared-transmitting perylene-based black pigment as described in claim 1, characterized in that, Its molecular structure is shown below: Formula-Ⅳ.
5. A black adhesive film with high infrared reflectivity, characterized in that, The infrared high reflectivity black adhesive film is a co-extruded double-layer adhesive film, comprising: a black reflective layer and a white high reflectivity layer; The black reflective layer includes at least one perylene-based black pigment and an organic polymer material with the aforementioned wide-band infrared penetrating properties; The white high-reflectivity layer includes at least one infrared high-reflectivity filler and an organic polymer material.
6. The infrared high-reflectivity black adhesive film as described in claim 5, characterized in that, The thickness of the infrared high reflectivity black adhesive film is 20–1000 μm; The thickness of the black reflective layer is 10–990 μm, and the mass percentage of the broadband infrared-transmitting perylene-based black pigment is 0.01–2 wt%. The thickness of the white high-reflectivity layer is 10–990 μm.
7. The infrared high-reflectivity black adhesive film as described in claim 5, characterized in that, The organic polymer material includes any one or more combinations of thermoplastic polyolefins, polyvinyl butyral, polyolefin elastomers, polyurethanes, thermoplastic polyurethanes, polyacrylates, ethylene vinyl acetate copolymers, organosilicon, and EAA ionomers.
8. The infrared high-reflectivity black adhesive film as described in claim 5, characterized in that, The black reflective layer comprises the following components by weight: 100 parts organic polymer material, 0.01-2 parts broadband infrared-transmitting perylene-based black pigment, 0.5-2 parts initiator, 0.01-1 parts light stabilizer, 0.1-2 parts crosslinking agent, 0.1-1 parts co-crosslinking agent, 0.01-1 parts antioxidant, 0.01-1 parts ultraviolet absorber, and 0.1-1.2 parts silane coupling agent; The white high-reflectivity layer comprises the following components by weight: 100 parts organic polymer material, 8-20 parts high-reflectivity filler, 0.5-2 parts initiator, 0.01-1 parts light stabilizer, 0.1-2 parts crosslinking agent, 0.1-1 parts co-crosslinking agent, 0.01-1 parts antioxidant, and 0.1-1.2 parts silane coupling agent.
9. A photovoltaic module, characterized in that, The photovoltaic module, from top to bottom, consists of glass, a first encapsulating film, a solar cell, a second encapsulating film, and a backsheet or glass; wherein the second encapsulating film is the infrared high-reflectivity black film as described in any one of claims 5-8.
10. The photovoltaic module as described in claim 9, characterized in that, The black reflective layer of the infrared high reflective black film is in contact with the battery cell, and the white high reflective layer is in contact with the back panel or glass of the module. The black reflective layer partially reflects the light passing through the gap between the batteries, and the white high reflective layer reflects the light passing through the black reflective layer.