High-reflection black packaging adhesive film and preparation method thereof

Abstract

The invention belongs to the technical field of photovoltaic packaging adhesive films, and particularly relates to a high-reflection black packaging adhesive film and a preparation method thereof.The preparation method comprises the following steps that S1, organic silicon photosensitive particle modified black filler is prepared, specifically, i, the black filler is dispersed in absolute ethyl alcohol, and a solution A is formed; ii, adding an organic silane coupling agent and phenyltriethoxysilane to obtain a silane hydrolysate B; iii, adding the silane hydrolysate B into the solution A, and obtaining a product through a precipitation method, so as to obtain the organic silicon photosensitive particle modified black filler; s2, the organic silicon photosensitive particle modified black filler and EVA resin are blended, extruded, cooled and cut into particles, and organic silicon photosensitive particle modified black master batches are obtained; s3, respectively preparing a black layer formula material and a white layer formula material; and S4, carrying out extrusion casting, embossing, cooling and rolling on the black layer formula material and the white layer formula material to obtain the high-reflection black packaging adhesive film.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of encapsulation adhesive film for photovoltaic, and particularly relates to a high-reflectivity black encapsulation adhesive film and a preparation method thereof. BACKGROUND

[0002] As a new type of green energy, photovoltaic power generation has a continuously increasing proportion in the overall energy structure due to its green environmental protection, high power generation capacity, and recyclable components.

[0003] With the continuous iteration and upgrading of photovoltaic cells, new BC cells and TOPCON cells gradually replace the original P-type cells, and rapidly occupy the market due to their high conversion efficiency. BC components exhibit significant advantages in the photovoltaic field due to their high power generation capacity, excellent low-light performance, and lower degree of electricity cost.

[0004] The front side of the BC component adopts a pure black non-grid line structure, which significantly improves the aesthetics compared to other cell components. Different colored adhesive films can be selected for packaging according to the building appearance and application scenario to achieve perfect matching with the application scenario. Currently, for BIPV and outdoor applications, most of them are packaged with high-transparency and black adhesive films. The black adhesive film and the black color of the cell are consistent, which improves the aesthetics of the component. The demand for this series of components is increasing.

[0005] In existing black adhesive films, black fillers are introduced to achieve a black appearance while improving the thermal conductivity of the adhesive film. However, black fillers are mostly organic formamide materials that can migrate to adjacent layers under hydrothermal aging conditions, causing discoloration of the adjacent layer and a decrease in reflectivity.

[0006] Therefore, how to overcome the migration defect of black fillers under hydrothermal aging conditions is a technical problem that needs to be solved in the field.

[0007] It should be noted that the above information disclosed in the background section is only used to understand the background of the present application, and therefore, the above description is not considered to constitute prior art information. SUMMARY

[0008] The present application provides at least a high-reflectivity black encapsulation adhesive film and a preparation method thereof.

[0009] In a first aspect, the present disclosure provides a preparation method of a high-reflective black packaging adhesive film, comprising the following steps: S1, preparing a black filler modified by silicone photosensitive particles, comprising: i. dispersing the black filler in anhydrous ethanol to form a solution A; ii. adding an organic silane coupling agent and phenyl triethoxysilane, controlling the pH value to be 2-4, and adding water to obtain a silane hydrolysis solution B; iii. adding 5-15% of the silane hydrolysis solution B to the solution A by mass fraction, and after mixing, the pH value is 7-9, the product is obtained by precipitation method, and the obtained product is washed, filtered to neutral, and dried to obtain the black filler modified by silicone photosensitive particles; S2, blending the black filler modified by silicone photosensitive particles with EVA resin, extruding, cooling, and granulating to prepare a black master batch modified by silicone photosensitive particles; S3, respectively preparing a black layer formula material and a white layer formula material, comprising: mixing the black master batch modified by silicone photosensitive particles and the silane-grafted EVA resin, and adding an additive to obtain the black layer formula material; mixing the titanium dioxide master batch and the EVA resin, and adding an additive to obtain the white layer formula material; S4, extruding, casting, embossing, cooling, and winding the black layer formula material and the white layer formula material to obtain the high-reflective black packaging adhesive film.

[0010] In an optional embodiment, the black filler comprises any one or a combination of multiple of iron oxide black, manganese iron black, titanium iron black, anthraquinone, phthalocyanine, indigo, sulfur indigo, quinacridone, perylene, dioxazine, isoindoline, indolinone ring, or azomethine.

[0011] In an optional embodiment, the ratio of the organic silane coupling agent and the phenyl triethoxysilane is 2:1, and the organic silane coupling agent comprises any one of vinyl trimethoxysilane, vinyl triethoxysilane, vinyl tri(β-methoxyethoxy)silane, N-(2-aminoethyl-3-aminopropyl)trimethoxysilane, 3-(2,3-epoxypropoxy)propyl methyldiethoxysilane, 3-(methacryloyl chloride)propyl trimethylsiloxane, or 3-(methacryloyloxy)propyl trimethoxysilane.

[0012] In an optional embodiment, the mass fraction of the black filler modified by silicone photosensitive particles in S2 is 3-10 parts, and the mass fraction of the EVA resin is 90-97 parts; and the extrusion is performed at a temperature not lower than 120°C.

[0013] In an optional embodiment, the preparation method of the silane-grafted EVA resin comprises: blending 88-96 parts of EVA resin, 1-4 parts of tert-butyl peroxide isopropyl carbonate, and 3-8 parts of vinyl triethoxysilane by mass fraction, and granulating at 160-220°C to obtain the silane-grafted EVA resin.

[0014] In an alternative embodiment, the preparation method of the titanium dioxide master batch comprises: blending 46-69 parts of EVA resin, 15-25 parts of 6000-7000 mesh titanium dioxide, 15-25 parts of 2000-3000 mesh titanium dioxide, and 1-4 parts of titanium dioxide dispersant by mass fraction, extruding at a temperature not lower than 120 DEG C, and cooling to obtain the titanium dioxide master batch.

[0015] In an alternative embodiment, the titanium dioxide dispersant comprises a combination of any one or more of pentaerythritol stearate, silicone, PE wax, PP wax, ethylene bis-stearamide, and erucic amide.

[0016] In a second aspect, the embodiments of the present disclosure further provide a high-reflectivity black packaging adhesive film, comprising: a white layer and a black layer; wherein the black layer comprises organic silicon light-sensitive particle modified black master batch and silane grafted EVA resin; and the high-reflectivity black packaging adhesive film comprises a double-layer structure of black layer-white layer and a three-layer structure of black layer-white layer-black layer.

[0017] In an alternative embodiment, the thickness of the black layer is 0.1-0.5 mm, and the thickness of the white layer is 0.2-0.5 mm.

[0018] In a third aspect, the embodiments of the present disclosure further provide a photovoltaic module using the high-reflectivity black packaging adhesive film as described above.

[0019] The present application has the following advantages: the high-reflectivity black packaging adhesive film and the preparation method thereof coat organic silicon light-diffusing particles on the surface of black fillers by using a precipitation method, improve the dispersibility of the black fillers, enhance the light-sensitive wave band of the black film layer, and move the reflection wave band of the adjusted black film from 740 nm to 720 nm. In combination with the white film layer and the combination of different particle size titanium dioxide white master batches, the high reflectivity of 85% or more in the wave band of 780-1100 nm is achieved. In addition, by introducing different proportions of grafted resins into the black film layer, the problem of migration of the black film layer fillers to the white film layer after aging is solved. After lamination of the silane grafted resin and the filler layer, the molecular chain is crosslinked and wound, the crosslinking after lamination is more compact, the migration resistance of the black fillers is increased, and the color migration of the black fillers to the white film layer after aging is delayed.

[0020] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved by the structures particularly pointed out in the description and the appended claims.

[0021] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are referred to for illustration. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 SEM images of the black filler before (left) and after (right) modification in Example 1 provided for the embodiments of the present disclosure;

[0024] Figure 2 Reflectance graphs of Comparative Example and Example 1 provided for the embodiments of the present disclosure. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] As used herein, the phrases "in one embodiment", "according to one embodiment", "in some embodiments", and the like generally mean the fact that a particular feature, structure, or characteristic described after the phrase can be included in at least one embodiment of the present disclosure. Therefore, the particular feature, structure or characteristic can be included in more than one embodiment of the present disclosure, so that these phrases do not necessarily refer to the same embodiment. As used herein, the terms "example", "exemplary", and the like are used as an example, instance, or illustration. Any implementation, aspect or design described herein as "example" or "exemplary" is not necessarily interpreted as preferred or superior to other implementations, aspects or designs. On the contrary, the use of the terms "example", "exemplary" and the like is intended to present the concept in a specific manner.

[0027] In this document, example 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" when following a list of elements modifies the entire list of elements and not the individual elements of the list. For example, the expression "at least one of a, b, and c" should be understood as including 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.

[0028] The terminology used herein is for the purpose of describing particular example configurations only and is not intended to be limiting. As used herein, the singular articles "a," "an," and "the" can be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated 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 groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order

[0029] CN10480465 discloses a black EVA-based film and a double-glass assembly thereof. By introducing black pigments and heat-conducting inorganic fillers into the EVA resin, the black film achieves black aesthetics while improving the heat-conducting performance of the film and reducing the working temperature of the double-glass assembly. However, the existing black fillers are prone to agglomeration, and the reflected light is mainly in the wavelength range of 780-1100 nm, which is too narrow to effectively utilize the reflected wavelength range.

[0030] CN114149769 provides a high-reflectivity black film, a preparation method and use thereof. The high-reflectivity black film comprises a black high-reflectivity layer and a white high-reflectivity layer stacked in sequence. Through the synergistic effect of the black high-reflectivity layer and the white high-reflectivity layer, the high-reflectivity black film has a high reflectivity, thereby improving the power of the photovoltaic module. However, only by controlling the reflectivity through the proportion of the black and white film layers, the existing film has insufficient reflectivity, and the power gain of the module is not large.

[0031] In view of the defects of the above-mentioned solutions, the inventors have obtained the results after careful research and practice, and therefore, the discovery process of the above-mentioned problems and the solutions proposed by the present disclosure to solve the above-mentioned problems should be the contribution of the inventors to the present disclosure in the process of the present disclosure.

[0032] It should be noted that similar reference numerals and letters refer to similar items throughout the accompanying drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0033] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0034] The embodiment of the present disclosure provides a preparation method of a high-reflective black packaging adhesive film, which comprises the following steps: S1, preparing an organic silicon photosensitive particle modified black filler, comprising: i. dispersing the black filler in anhydrous ethanol to form a solution A; ii. adding an organic silane coupling agent and phenyl triethoxysilane, controlling the pH value to be 2-4, and adding water to obtain a silane hydrolysis solution B; iii. adding 5-15% of the silane hydrolysis solution B to the solution A by mass ratio, and after mixing, the pH value is 7-9, the product is obtained by a precipitation method, and the obtained product is washed, filtered to neutral, and dried to obtain the organic silicon photosensitive particle modified black filler; S2, blending the organic silicon photosensitive particle modified black filler with EVA resin, extruding, cooling, and cutting to prepare an organic silicon photosensitive particle modified black master batch; S3, respectively preparing a black layer formula material and a white layer formula material, comprising: mixing the organic silicon photosensitive particle modified black master batch and the silane grafted EVA resin, and adding an additive to obtain the black layer formula material; mixing the titanium white master batch and the EVA resin, and adding an additive to obtain the white layer formula material; S4, extruding, casting, embossing, cooling and winding the black layer formula material and the white layer formula material to obtain the high-reflective black packaging adhesive film.

[0035] In some embodiments, specifically, the black filler comprises any one or a combination of multiple of iron oxide black, manganese iron black, titanium iron black, anthraquinone, phthalocyanine, indigo, sulfur indigo, quinacridone, perylene, dioxazine, isoindoline, indolinone ring or azomethine.

[0036] In an alternative implementation, the ratio of the organic silane coupling agent and the phenyl triethoxysilane is 2:1, and the organic silane coupling agent comprises any one of vinyl trimethoxysilane, vinyl triethoxysilane, vinyl tri(β-methoxyethoxy)silane, N-(2-aminoethyl-3-aminopropyl)trimethoxysilane, 3-(2,3-epoxypropoxy)propyl methyldiethoxysilane, 3-(methacryloyl chloride)propyl trimethylsiloxane or 3-(methacryloyloxy)propyl trimethoxysilane.

[0037] Specifically, by introducing different proportions of grafted resins in the black film layer, the molecular chain crosslinking is achieved after the silane grafted resin and the filler are laminated, the crosslinking is more compact after lamination, the migration resistance of the black filler is increased, the color migration of the black filler to the white film layer after aging is delayed, the PCT 192h aging▲B value is less than 3, and the reflectivity attenuation is less than 5%.

[0038] In some embodiments, specifically, the mass fraction of the organic silicon photosensitive particle modified black filler in S2 is 3-10 parts, and the mass fraction of the EVA resin is 90-97 parts; and the extrusion is carried out at an environment of not less than 120 DEG C.

[0039] In some embodiments, specifically, the preparation method of the silane grafted EVA resin comprises: blending 88-96 parts of EVA resin, 1-4 parts of tert-butyl peroxy isopropyl carbonate, and 3-8 parts of vinyl triethoxysilane by mass fraction, granulating at 160-220 DEG C, to obtain the silane grafted EVA resin.

[0040] In some embodiments, specifically, the preparation method of the titanium dioxide masterbatch comprises: blending 46-69 parts of EVA resin, 15-25 parts of 6000-7000 mesh titanium dioxide, 15-25 parts of 2000-3000 mesh titanium dioxide, and 1-4 parts of titanium dioxide dispersant by mass fraction, extruding at not less than 120 DEG C, and cooling to obtain the titanium dioxide masterbatch.

[0041] Specifically, the white film layer uses different particle size titanium dioxide white masterbatch combinations to increase the light reflection path by particle size difference, increase the reflectivity of the white film layer, and achieve a high reflectivity of 85% or more in the 750-1100 nm wave band of the black and white film.

[0042] In some embodiments, specifically, the titanium dioxide dispersant comprises any one or a combination of pentaerythritol stearate, silicone, PE wax, PP wax, ethylene bis-stearamide, and erucamide.

[0043] The embodiments of the present disclosure also provide a high-reflectivity black packaging adhesive film, comprising: a white layer and a black layer; wherein the black layer comprises an organic silicon photosensitive particle modified black masterbatch and a silane grafted EVA resin; and the high-reflectivity black packaging adhesive film comprises a double-layer structure of black layer-white layer and a three-layer structure of black layer-white layer-black layer.

[0044] In some embodiments, specifically, the thickness of the black layer is 0.1-0.5 mm, and the thickness of the white layer is 0.2-0.5 mm.

[0045] The embodiments of the present disclosure also provide a photovoltaic module using the high-reflectivity black packaging adhesive film as described above.

[0046] Embodiment 1

[0047] The preparation method of the high-reflectivity black packaging adhesive film comprises the following steps:

[0048] S1, preparing an organic silicon photosensitive particle modified black filler, comprising:

[0049] i. 10 parts of black filler is weighed and dispersed in 50 parts of anhydrous ethanol, stirred uniformly to form solution A;

[0050] ⅱTake 2 ml of vinyl trimethoxysilane coupling agent and 1 ml of phenyl triethoxysilane, add 2-3 parts of acetic acid drop by drop to control pH value of 2-4, then add 100 parts of water and stir for 10-20 min to obtain silane hydrolysis solution B;

[0051] ⅲTake 10% of silane hydrolysis solution B by mass fraction of solution A and add to solution A, stir at 250 r / min until mixed evenly, add ammonia water drop by drop to adjust pH value to 7-9, wash and filter the obtained product to neutral, dry at 80℃ for 3h to obtain silicone photosensitive particle modified black filler;

[0052] S2, 10 parts of silicone photosensitive particle modified black filler and 90 parts of EVA resin are blended, extruded, cooled and pelletized to prepare silicone photosensitive particle modified black masterbatch;

[0053] S3, respectively prepare black layer formula material and white layer formula material, including: mixing 6 parts of silicone photosensitive particle modified black masterbatch and 5 parts of silane grafted EVA resin, adding additives to obtain black layer formula material; mixing 20 parts of titanium dioxide masterbatch with 80 parts of EVA resin, adding additives to obtain white layer formula material;

[0054] S4, the black layer formula material and the white layer formula material are extruded, embossed, cooled and wound to obtain high reflection black packaging adhesive film.

[0055] The mass fraction of the silicone photosensitive particle modified black filler is 10 parts, the mass fraction of the EVA resin is 90 parts; and the extrusion is carried out at not less than 120℃.

[0056] The preparation method of the silane grafted EVA resin comprises: blending 95 parts of EVA resin, 1 part of tert-butyl peroxy isopropyl carbonate and 4 parts of vinyl triethoxysilane by mass fraction, and pelletizing at 160-220℃ to obtain silane grafted EVA resin.

[0057] The preparation method of the titanium dioxide masterbatch comprises: blending 58 parts of EVA resin, 20 parts of 6000-7000 mesh titanium dioxide, 20 parts of 2000-3000 mesh titanium dioxide and 2 parts of titanium dioxide dispersant by mass fraction, and extruding at not less than 120℃, cooling to obtain titanium dioxide masterbatch.

[0058] Example 2

[0059] ⅰTake 10 parts of black filler and disperse in 50 parts of anhydrous ethanol, stir evenly to form solution A;

[0060] ⅱTake 2 ml of vinyl tri (β-methoxy ethoxy) silane coupling agent and 1 ml of phenyl triethoxysilane, dropwise add acetic acid 2-3 parts control pH value is 2-4, then add 100 parts of water stirring reaction 10-20 min, get silane hydrolyzate B;

[0061] ⅲTake solution A mass ratio 10% of silane hydrolyzate B is added to solution A, with 250 r / min high speed stirring to mix evenly, dropwise add ammonia water to adjust pH value is 7-9, the product is washed, filtered to neutral, 80 ℃ drying 3 h get silicone photosensitive particle modified black filler;

[0062] The rest of the steps according to example 1.

[0063] Example 3

[0064] ⅰTake 10 parts of black filler dispersed in 50 parts of anhydrous ethanol, stirring evenly, form solution A;

[0065] ⅱTake 2 ml of N-(2-aminoethyl-3-aminopropyl) trimethoxysilane coupling agent and 1 ml of phenyl triethoxysilane, dropwise add acetic acid 2-3 parts control pH value is 2-4, then add 100 parts of water stirring reaction 10-20 min, get silane hydrolyzate B;

[0066] ⅲTake solution A mass ratio 10% of silane hydrolyzate B is added to solution A, with 250 r / min high speed stirring to mix evenly, dropwise add ammonia water to adjust pH value is 7-9, the product is washed, filtered to neutral, 80 ℃ drying 3 h get silicone photosensitive particle modified black filler;

[0067] The rest of the steps according to example 1.

[0068] Example 4

[0069] ⅰTake 10 parts of black filler dispersed in 50 parts of anhydrous ethanol, stirring evenly, form solution A;

[0070] ⅱTake 2 ml of vinyl tri (β-methoxy ethoxy) silane coupling agent and 1 ml of phenyl triethoxysilane, dropwise add acetic acid 2-3 parts control pH value is 2-4, then add 100 parts of water stirring reaction 10-20 min, get silane hydrolyzate B;

[0071] ⅲTake solution A mass ratio 15% of silane hydrolyzate B is added to solution A, with 250 r / min high speed stirring to mix evenly, dropwise add ammonia water to adjust pH value is 7-9, the product is washed, filtered to neutral, 80 ℃ drying 3 h get silicone photosensitive particle modified black filler;

[0072] The rest of the steps according to example 1.

[0073] Example 5

[0074] i. Take 10 parts of black filler and disperse in 50 parts of anhydrous ethanol, stir evenly to form solution A;

[0075] ii. Take 2 ml of vinyl tri (β-methoxy ethoxy) silane coupling agent and 1 ml of phenyl triethoxysilane, add dropwise 2-3 parts of acetic acid to control pH value to 2-4, then add 100 parts of water and stir for 10-20 min to obtain silane hydrolysis solution B;

[0076] iii. Take 20% of silane hydrolysis solution B of solution A and add to solution A, stir at 250 r / min until mixed evenly, add dropwise ammonia water to adjust pH value to 7-9, wash and filter the obtained product to neutral, and dry at 80°C for 3 h to obtain silicone photosensitive particle modified black filler;

[0077] The remaining steps are according to Example 1.

[0078] Comparative Example 1

[0079] The process is the same as Example 1, except that the black filler is not modified.

[0080] Comparative Example 2

[0081] The process is the same as Example 1, except that 5 parts of silane grafted EVA grafting material are removed.

[0082] Comparative Example 3

[0083] The process is the same as Example 1, except that 6000-7000 mesh titanium dioxide powder in the white master batch is removed and 40 parts of 2000-3000 mesh titanium dioxide powder is used.

[0084]

[0085] Specifically, the present application compares different types of silane and different silane addition amount, and the vinyl tri (β-methoxy ethoxy) silane coupling agent in Example 4 performs best, and after adding 15% of silane hydrolysis solution, the reflectivity can reach 82.8, and the reflectivity attenuation is within 1% after aging, and the color phase L value of the adhesive film decreases.

[0086] Specifically, in Comparative Example 1, the black filler is not modified, and the aging resistance performance is obviously reduced. Part of the black filler migrates after PCT192h treatment, which further leads to the power attenuation of the module.

[0087] Specifically, in Comparative Example 2, the addition of silane grafted EVA resin is reduced, and the performance parameters show that simply modifying the black filler cannot solve the migration problem of the black filler, and it can only be realized after the black filler is modified and combined with silane grafted EVA resin.

[0088] Specifically, only large particle size titanium dioxide is added in Comparative Example 3, and small particle size titanium dioxide is removed. The large particle size titanium dioxide has a wide particle size range, and the stacking gap between the titanium dioxide particles in the film is large, which cannot effectively cover the film, resulting in the penetration of part of the light through the film, causing the initial reflectivity to decrease. Small particle size titanium dioxide can more effectively fill the stacking gap of large particle size titanium dioxide, improve the covering power of titanium dioxide, and at the same time, different particle sizes of titanium dioxide can easily form a reflection angle, which can more effectively reflect sunlight and improve the reflectivity of the film.

[0089] Based on the above ideal embodiments according to the present application, through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A method for preparing a high-reflectivity black encapsulating film, characterized in that, It includes the following steps: S1. Prepare organosilicon photosensitive particle modified black filler, including: ⅰ Disperse the black filler in absolute ethanol to form solution A; ⅱ Mix organosilane coupling agent and phenyltriethoxysilane, control the pH value to be 2 - 4, and add water to obtain silane hydrolysis solution B; ⅲ Take 5 - 15% of solution B by mass ratio of solution A and add it to solution A. After mixing, the pH value is 7 - 9. Obtain the product by precipitation method, and wash and filter the obtained product to neutrality, and dry to obtain organosilicon photosensitive particle modified black filler; S2. Blend, extrude, cool and pelletize the organosilicon photosensitive particle modified black filler and EVA resin to prepare organosilicon photosensitive particle modified black masterbatch; S3. Prepare black layer formulation and white layer formulation respectively, including: Mix the organosilicon photosensitive particle modified black masterbatch and silane - grafted EVA resin, and add additives to obtain black layer formulation; Mix the titanium dioxide masterbatch and EVA resin, and add additives to obtain white layer formulation; S4. Extrude, cast, emboss, cool and wind up the black layer formulation and white layer formulation to obtain a highly reflective black encapsulation film.

2. The preparation method according to claim 1, wherein the black filler includes any one or a combination of more than one of iron oxide black, manganese iron black, titanium iron black, anthraquinone, phthalocyanine, indigo, thioindigo, quinacridone, perylene series, dioxazine, isoindoline, indolinone ring or azomethine; 3. The preparation method according to claim 1, wherein the ratio of the organosilane coupling agent to phenyltriethoxysilane is 2:1, and the organosilane coupling agent includes any one of vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri(β - methoxyethoxy)silane, N-(2 - aminoethyl - 3 - aminopropyl)trimethoxysilane, 3-(2,3 - epoxypropoxy)propylmethyldiethoxysilane, 3-(methacryloyl chloride)propyltrimethoxysilane or 3-(methacryloyloxy)propyltrimethoxysilane; 4. The preparation method according to claim 1, wherein in S2, the mass fraction of the organosilicon photosensitive particle modified black filler is 3 - 10 parts, and the mass fraction of EVA resin is 90 - 97 parts; and extrude under the environment not lower than 120℃.

5. The preparation method according to claim 1, wherein the preparation method of the silane - grafted EVA resin includes: By mass fraction, blend 88 - 96 parts of EVA resin, 1 - 4 parts of isopropyl percarbonate tert - butyl and 3 - 8 parts of vinyltriethoxysilane, and pelletize at 160 - 220℃ to obtain silane - grafted EVA resin.

6. The preparation method according to claim 1, wherein the preparation method of the titanium dioxide masterbatch includes: By mass fraction, blend 46 - 69 parts of EVA resin, 15 - 25 parts of titanium dioxide with 6000 - 7000 meshes, 15 - 25 parts of titanium dioxide with 2000 - 3000 meshes and 1 - 4 parts of titanium dioxide dispersant, extrude under the environment not lower than 120℃, and cool to obtain titanium dioxide masterbatch.

7. The preparation method according to claim 6, characterized in that, The titanium dioxide dispersant includes any one or more combinations of pentaerythritol stearate, silicone, PE wax, PP wax, ethylene bis-stearamide, and erucamide.

8. A high-reflectivity black encapsulating film, characterized in that, include: White layer and black layer; The black layer comprises organosilicon photosensitive particle modified black masterbatch and silane-grafted EVA resin. The high-reflectivity black encapsulating film includes a two-layer structure of black layer-white layer and a three-layer structure of black layer-white layer-black layer.

9. The high-reflectivity black encapsulating film as described in claim 8, characterized in that, The thickness of the black layer is 0.1 to 0.5 mm, and the thickness of the white layer is 0.2 to 0.5 mm.

10. A photovoltaic module, characterized in that, The high-reflectivity black encapsulating film as described in claim 8 or 9 is used.

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