Colored adhesive film, preparation method thereof and photovoltaic module

Abstract

The invention relates to the technical field of photovoltaic materials, in particular to a colored adhesive film, a preparation method thereof and a photovoltaic module. The colored adhesive film comprises a film main body and modified light conversion powder dispersed in the film main body, in the colored adhesive film, the mass fraction of the modified light conversion powder is 0.9%-4%; the modified light conversion powder is mainly prepared from the following raw materials in parts by weight: 100 parts of epoxy group modified polystyrene, 5-50 parts of light conversion powder, 0.1-5 parts of an organic amine catalyst and 50-200 parts of a solvent. The specific modified light conversion powder adopted in the colored adhesive film can exert the colored effect of epoxy group modified polystyrene, can absorb ultraviolet photons, improves the UV aging resistance of the adhesive film, and improves the fluorescence quantum efficiency of the colored adhesive film.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic materials, and in particular to a colored adhesive film and a preparation method thereof, and a photovoltaic module. Background Art

[0002] With the development of HJT battery modules, the colored building integrated photovoltaic (BIPV) of HJT batteries has gradually attracted people's attention. BIPV is a technology that integrates solar panels into buildings. In addition to the power generation function, BIPV modules must also have the functions of building materials and aesthetics. The colorization of photovoltaic modules is one of the core technologies of BIPV. In order to realize the colorization of the film, the main methods are currently printing a color layer on the surface of the film, adding organic or inorganic pigments to the film, etc.

[0003] For HJT battery modules, although the existing color films can achieve colorization, their UV aging resistance is poor. Therefore, HJT battery modules made of existing color films are prone to light aging, resulting in a short service life of the modules. In addition, the current color films have low photoelectric conversion efficiency, which affects the power generation of the modules, greatly limiting the application of color films in HJT battery modules.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] One object of the present invention is to provide a colored adhesive film to solve the technical problems existing in the prior art such as poor UV aging resistance and low photoelectric conversion efficiency of the colored adhesive film.

[0006] Another object of the present invention is to provide a method for preparing a colored adhesive film.

[0007] Another object of the present invention is to provide a photovoltaic module.

[0008] In order to achieve the above-mentioned object of the present invention, the present invention provides a color adhesive film, comprising a film body and modified light conversion powder dispersed in the film body; in the color adhesive film, the mass fraction of the modified light conversion powder is 0.9% to 4%; The modified light-converting powder is mainly prepared from the following raw materials in parts by weight: 100 parts of epoxy-modified polystyrene, 5-50 parts of photoconversion powder, 0.1-5 parts of organic amine catalyst and 50-200 parts of solvent; The photoconversion powder includes at least one of the compounds shown in the structures of the following formulas I to II: , .

[0009] In a specific embodiment of the present invention, the organic amine catalyst includes at least one of triethylamine and benzyldimethylamine.

[0010] In a particular embodiment of the present invention, the solvent comprises xylene.

[0011] In a specific embodiment of the present invention, the epoxy-modified polystyrene is mainly prepared by copolymerization of styrene and glycidyl methacrylate. Further, in the epoxy-modified polystyrene, the mass content of epoxy groups is 20% to 40%.

[0012] In a specific embodiment of the present invention, in the modified photoconversion powder, the mass ratio of the epoxy-modified polystyrene to the photoconversion powder is 100:(5-20).

[0013] In a specific embodiment of the present invention, the particle size of the epoxy-modified polystyrene is 100-300 μm.

[0014] In a specific embodiment of the present invention, the preparation method of the modified photoconverter powder comprises: The photoconversion powder and the epoxy-modified polystyrene are dispersed or dissolved in the solvent, and reacted at 50-70° C. under the catalysis of the organic amine catalyst. After the reaction is completed, the precipitate is collected and washed to obtain the modified photoconversion powder.

[0015] In a specific embodiment of the present invention, the film body includes the following components by weight: 100 parts of EVA resin, 0.5-1.5 parts of cross-linking agent, 0.1-1 parts of auxiliary cross-linking agent, 0.1-0.5 parts of antioxidant, 0.1-1 parts of light stabilizer and 0.3-1.5 parts of coupling agent.

[0016] Another aspect of the present invention provides a method for preparing any one of the above-mentioned colored adhesive films, comprising the following steps: uniformly mixing the film body and the modified photoconverter powder in proportion, and extruding and casting the mixture into a film.

[0017] Another aspect of the present invention provides a photovoltaic module, comprising any one of the above-mentioned colored adhesive films.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) The modified photoconversion powder used in the color film of the present invention is compounded with epoxy-modified polystyrene and the photoconversion powder in a certain proportion, and the amino group of the photoconversion powder and the epoxy group in the polystyrene are subjected to a ring-opening reaction under the catalysis of an organic amine catalyst; the photoconversion powder and the epoxy-modified polystyrene are chemically grafted, so that the modified photoconversion powder can not only exert the color effect of the epoxy-modified polystyrene, but also absorb ultraviolet photons, thereby improving the UV aging resistance of the film and improving the fluorescence quantum efficiency of the color film; (2) The photovoltaic module made of the colored adhesive film of the present invention can not only ensure the colorization of the adhesive film, but also increase the service life of the photovoltaic module and enhance the power of the photovoltaic module. DETAILED DESCRIPTION

[0019] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be appreciated by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0020] In one aspect, the present invention provides a color adhesive film, comprising a film body and modified light-converting powder dispersed in the film body; in the color adhesive film, the mass fraction of the modified light-converting powder is 0.9% to 4%; The modified light-converting powder is mainly prepared from the following raw materials in parts by weight: 100 parts of epoxy-modified polystyrene, 5-50 parts of photoconversion powder, 0.1-5 parts of organic amine catalyst and 50-200 parts of solvent; The light-converting powder includes at least one of the compounds shown in the structures of the following formulas Ⅰ to Ⅱ: , .

[0021] The modified light-converting powder used in the color adhesive film of the present invention can not only significantly improve the UV resistance of the component and extend the service life, but also increase the power of the component.

[0022] The modified photoconversion powder in the color adhesive film of the present invention is compounded with epoxy-modified polystyrene and photoconversion powder in a certain proportion, and the amino groups of the photoconversion powder and the epoxy groups in the polystyrene are used to carry out a ring-opening reaction under the catalysis of an organic amine catalyst; the photoconversion powder and the epoxy-modified polystyrene are chemically grafted, so that the modified photoconversion powder can not only exert the color effect of the epoxy-modified polystyrene, but also absorb ultraviolet photons, thereby improving the UV aging resistance of the adhesive film and improving the fluorescent quantum efficiency of the color adhesive film.

[0023] The study found that when the mass fraction of the modified light-converting powder in the color film is too low, the improvement of UV aging resistance and fluorescent quantum efficiency is not obvious; when the mass fraction of the modified light-converting powder in the color film is too high, the compatibility of the polystyrene matrix in the modified light-converting powder with the main body of the film deteriorates, and the degree of dispersion uniformity deteriorates, resulting in reduced UV aging resistance. The present invention regulates the mass fraction of the modified light-converting powder in the color film within the range of 0.9% to 4%, so as to ensure compatibility, UV aging resistance, fluorescent quantum efficiency, etc. For example, in different embodiments, the content fraction of the modified light-converting powder in the color film can be 0.9%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, or a range consisting of any two of them.

[0024] For example, in different embodiments, among the raw materials of the modified photoconverter powder, by weight, compared to 100 parts by weight of epoxy-modified polystyrene, the amounts of the remaining raw materials can be as follows: The amount of the light conversion powder can be 5 parts, 8 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts or a range consisting of any two of them; The amount of the organic amine catalyst can be 0.1 parts, 0.5 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts or a range consisting of any two of them; The amount of the solvent can be 50 parts, 60 parts, 80 parts, 100 parts, 120 parts, 150 parts, 180 parts, 200 parts or a range consisting of any two of them.

[0025] In a specific embodiment of the present invention, the organic amine catalyst includes at least one of triethylamine and benzyldimethylamine. Using triethylamine and / or benzyldimethylamine as a catalyst can make the amino group of the light-converted powder react with the epoxy group.

[0026] In a specific embodiment of the present invention, the solvent includes xylene. In actual operation, the type of solvent can be conventionally replaced as long as it can dissolve or disperse the material and facilitate subsequent removal.

[0027] In a specific embodiment of the present invention, the epoxy-modified polystyrene is mainly prepared by copolymerization of styrene and glycidyl methacrylate. Further, in the epoxy-modified polystyrene, the mass content of epoxy groups is 20% to 40%.

[0028] In the color film system of the present invention, when the content of epoxy groups in the epoxy-modified polystyrene is too high, the content of graftable light-converting powder is high, and the excessive grafting amount and cross-linking degree of light-converting powder easily lead to excessive rigidity of the chain segments in the modified light-converting powder, which is not conducive to the dispersion of the modified light-converting powder in the main body of the film; and when the content of epoxy groups in the epoxy-modified polystyrene is too low, the content of graftable light-converting powder is low, resulting in limited improvement of the modified light-converting powder for UV aging resistance and fluorescence quantum yield. In the epoxy-modified polystyrene, the appropriate content of epoxy groups helps to ensure the dispersibility of the modified light-converting powder in the main body of the film, and give full play to the improvement of the UV aging resistance and fluorescence quantum efficiency of the modified light-converting powder. For example, in different embodiments, the mass content of epoxy groups in the epoxy-modified polystyrene can be 20%, 22%, 25%, 28%, 30%, 32%, 35%, 38%, 40% or any two thereof.

[0029] In a specific embodiment of the present invention, in the modified photoconversion powder, the mass ratio of epoxy-modified polystyrene to the photoconversion powder is 100: (5-20).

[0030] In the following different embodiments, in the modified light-converting powder, the mass ratio of epoxy-modified polystyrene to light-converting powder can be 100:5, 100:8, 100:10, 100:12, 100:15, 100:18, 100:20 or any two of them. By adjusting the ratio of the two within the above range and matching the content of epoxy groups in epoxy-modified polystyrene, a suitable grafting amount can be achieved, the dispersibility of the modified light-converting powder can be ensured, and it is helpful to give full play to the UV aging resistance and light conversion efficiency of the modified light-converting powder.

[0031] In a specific embodiment of the present invention, the particle size of the epoxy-modified polystyrene is 100-300 μm. For example, in different embodiments, the particle size of the epoxy-modified polystyrene can be 100 μm, 120 μm, 150 μm, 180 μm, 200 μm, 220 μm, 250 μm, 280 μm, 300 μm, or any two thereof.

[0032] The epoxy-modified polystyrene used in the present invention can be homemade or directly purchased. For example, the colored polystyrene microsphere powder provided by Beijing Zhongke Keyou Technology Co., Ltd. can be used, and the epoxy content is 20% to 40%. The specific color can be adjusted and selected according to actual needs.

[0033] In a specific embodiment of the present invention, the preparation method of the modified light-converting powder comprises: The photoconversion powder and epoxy-modified polystyrene are dispersed or dissolved in a solvent, and reacted at 50-70 DEG C under the catalysis of an organic amine catalyst. After the reaction is completed, the precipitate is collected and washed to obtain the modified photoconversion powder.

[0034] For example, in different embodiments, the reaction temperature can be 50° C., 55° C., 60° C., 65° C., 70° C., or a range consisting of any two thereof. The specific reaction time can be conventionally adjusted according to the progress of the reaction, such as the reaction time can be 1 to 3 hours.

[0035] After the reaction is completed, the precipitate is collected, washed with ethanol to remove the catalyst or unreacted raw materials, and then dried to obtain the modified photoconverter powder.

[0036] In a specific embodiment of the present invention, the film body includes the following components by weight: 100 parts of EVA resin, 0.5-1.5 parts of cross-linking agent, 0.1-1 parts of auxiliary cross-linking agent, 0.1-0.5 parts of antioxidant, 0.1-1 parts of light stabilizer and 0.3-1.5 parts of coupling agent.

[0037] The composition of the film body can be the same as that of the conventional EVA film used for color film. For example, in different embodiments, in the film body, by weight, compared to 100 parts of EVA resin, the amounts of the remaining components can be as follows: The amount of the cross-linking agent can be 0.5 parts, 0.8 parts, 1 part, 1.2 parts, 1.5 parts or a range consisting of any two of them; The amount of the auxiliary cross-linking agent can be 0.1 part, 0.2 part, 0.5 part, 0.8 part, 1 part or a range consisting of any two thereof; The amount of the antioxidant can be 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part or a range consisting of any two of them; The amount of the light stabilizer can be 0.1 part, 0.2 part, 0.5 part, 0.8 part, 1 part or a range consisting of any two thereof; The amount of the coupling agent can be 0.3 parts, 0.5 parts, 0.8 parts, 1 parts, 1.2 parts, 1.5 parts or a range consisting of any two of them.

[0038] Among them, the types of each auxiliary agent can be exemplified as follows, but are not limited thereto: The cross-linking agent is selected from at least one of peroxide cross-linking agents, for example, tert-butyl peroxycarbonate-2-ethylhexyl ester; Co-crosslinking agents include ethylene glycol dimethacrylate; The antioxidant includes any one or more of a hindered phenol antioxidant and a phosphite antioxidant; Light stabilizers include 4-benzoyloxy-2,2,6,6-tetramethylpiperidine; The coupling agent includes at least one of silane coupling agents, such as an epoxy-containing silane coupling agent, specifically γ-glycidyloxypropyltrimethoxysilane.

[0039] Another aspect of the present invention provides a method for preparing any one of the above-mentioned colored adhesive films, comprising the following steps: uniformly mixing the film body and the modified photoconverter powder in proportion, and extruding and casting the mixture into a film.

[0040] In a specific embodiment of the present invention, the temperature of extrusion casting is 75-90°C.

[0041] In actual operation, the uniform mixing operation can be carried out in a mixer, and the extrusion casting film forming operation can be carried out in a casting machine. Specifically, the extrusion casting temperature can be 75°C, 80°C, 85°C, 90°C or a range consisting of any two thereof. The specific extrusion casting temperature can be adjusted conventionally to obtain a color film with quality that meets the requirements.

[0042] In a specific embodiment of the present invention, the thickness of the color film is 0.05-2 mm, such as 0.5 mm, etc., and can be conventionally adjusted according to the actual needs of the photovoltaic module.

[0043] Another aspect of the present invention provides a photovoltaic module, comprising any one of the above-mentioned colored adhesive films.

[0044] In a specific embodiment of the present invention, the photovoltaic module includes a HJT cell and glass, and the colored adhesive film is attached between the HJT cell and the glass.

[0045] Some product information used in the specific implementation of the present invention may be as follows, which are conventional materials in the art, but are not limited thereto: EVA resin: Sailbon V2825, melt index is 25g / 10min, VA content is 28%; Epoxy-modified polystyrene: Beijing Zhongke Keyou Technology Co., Ltd., colored polystyrene (PS) microsphere powder (the color is red, but not limited to this), the epoxy content is 30wt%, and the average particle size is 200μm.

[0046] Example 1 This embodiment provides a color film and a preparation method thereof, wherein the preparation method comprises the following steps: (1) Preparation of modified photoconversion powder: Weigh 100 parts by weight of epoxy-modified polystyrene, 10 parts by weight of the compound represented by formula I, 1 part of triethylamine and 70 parts of xylene, mix them evenly, heat to 60°C, stir and react for 2 hours, centrifuge and collect the precipitate, wash the precipitate with ethanol, and dry to obtain the modified photoconversion powder.

[0047] Wherein, the structure of formula I is shown below: .

[0048] (2) Preparation of a colored adhesive film: 100 parts by weight of EVA resin are weighed and placed in a mixer, and then 1 part by weight of a crosslinking agent, 2-ethylhexyl tert-butyl peroxycarbonate, 0.5 parts by weight of an auxiliary crosslinking agent, ethylene glycol dimethacrylate, 0.5 parts by weight of an antioxidant, tris(nonylphenyl) phosphite, 1 part by weight of a light stabilizer, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 0.8 parts by weight of a coupling agent, γ-glycidyloxypropyltrimethoxysilane and 2 parts by weight of the modified photosensitive adhesive powder obtained in step (1) are added to the mixer, the mixture is mixed evenly in the mixer, and the mixture is put into a casting machine, and is plasticized, extruded, stretched, pulled and rolled at 80° C. to form an EVA colored adhesive film with a thickness of 0.5 mm.

[0049] Example 2 This embodiment refers to the color film and preparation method thereof of Embodiment 1, with the only difference being that in step (1) of preparing the modified photoconverter powder, an equal weight of the compound represented by the structure of Formula II is used to replace the compound represented by the structure of Formula I in Embodiment 1.

[0050] Wherein, the structure of formula II is shown below:

[0051] Example 3 This embodiment refers to the color film and preparation method thereof of Example 1, with the only difference being that in step (1) of preparing the modified photoconverter powder, the amount of the compound represented by the structure of formula I is different.

[0052] In the preparation of the modified photoconverter powder of this embodiment, the weight proportion of the compound represented by the structure of formula I is 5 parts.

[0053] Example 4 This embodiment refers to the color film and preparation method thereof of Example 1, with the only difference being that in step (1) of preparing the modified photoconverter powder, the amount of the compound represented by the structure of formula I is different.

[0054] In the preparation of the modified photoconverter powder of this embodiment, the weight proportion of the compound represented by the structure of formula I is 20 parts.

[0055] Example 5 This embodiment refers to the color film and preparation method thereof of Example 1, with the only difference being that in step (1) of preparing the modified photoconverter powder, the weight fraction of the compound represented by the structure of formula I is different.

[0056] In the preparation of the modified photoconverter powder of this embodiment, the amount of the compound represented by the structure of formula I is 50 parts.

[0057] Example 6 This embodiment refers to the color film and preparation method thereof of embodiment 1, with the only difference being that in step (2) of preparing the color film, the amount of modified photoconversion powder used is different.

[0058] In the preparation of the color film of this embodiment, the weight portion of the modified photoconversion powder is 1 part.

[0059] Example 7 This embodiment refers to the color film and preparation method thereof of embodiment 1, with the only difference being that in step (2) of preparing the color film, the amount of modified photoconversion powder used is different.

[0060] In the preparation of the color film of this embodiment, the weight proportion of the modified photoconversion powder is 4 parts.

[0061] Comparative Example 1 Comparative Example 1 provides a method for preparing a film, comprising the following steps: weighing 100 parts by weight of EVA resin and placing it in a mixer, then adding 1 part by weight of a cross-linking agent, tert-butyl peroxycarbonate-2-ethylhexyl ester, 0.5 parts by weight of an auxiliary cross-linking agent, ethylene glycol dimethacrylate, 0.5 parts by weight of an antioxidant, tris(nonylphenyl) phosphite, 1 part by weight of a light stabilizer, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 0.8 parts by weight of a coupling agent, γ-glycidyloxypropyltrimethoxysilane, 0.18 parts by weight of a compound shown in Formula I and 1.82 parts by weight of epoxy-modified polystyrene (same as Example 1) to the mixer, mixing the mixture evenly in the mixer, putting the mixture into a casting machine, and preparing an EVA colored film with a thickness of 0.5 mm through plasticization, extrusion, stretching, pulling and winding at 80°C.

[0062] Comparative Example 2 Comparative Example 2 refers to the color film and preparation method thereof of Example 1, except that step (1) is not included, and in step (2), 2 parts by weight of epoxy-modified polystyrene is used to replace the modified photoconductive powder obtained in step (1).

[0063] Comparative Example 3 Comparative Example 3 refers to the adhesive film and its preparation method of Example 1, except that: step (1) is not included, and in step (2), 2 parts by weight of the compound represented by the structure of formula I are used to replace the modified photoconverter powder prepared in step (1).

[0064] Comparative Example 4 Comparative Example 4 refers to the color film and preparation method thereof of Example 1, except that: in step (1) of preparing the modified photoconverter powder, the amount of the compound represented by the structure of Formula I is different.

[0065] In the preparation of the modified photoconverter powder of Comparative Example 4, the weight proportion of the compound represented by the structure of Formula I is 2 parts.

[0066] Comparative Example 5 Comparative Example 5 refers to the color film and preparation method thereof of Example 1, except that: in step (1) of preparing the modified photoconverter powder, the amount of the compound represented by the structure of Formula I is different.

[0067] In the preparation of the modified photoconverter powder of Comparative Example 5, the weight proportion of the compound represented by the structure of Formula I is 60 parts.

[0068] Comparative Example 6 Comparative Example 6 refers to the color film and preparation method thereof of Example 1, except that: in step (2) of preparing the color film, the amount of modified photoconversion powder used is different.

[0069] In the preparation of the color film of Comparative Example 6, the weight portion of the modified photoconverter powder is 0.5 parts.

[0070] Comparative Example 7 Comparative Example 7 refers to the color film and preparation method thereof of Example 1, except that: in step (2) of preparing the color film, the amount of modified photoconversion powder used is different.

[0071] In the preparation of the color film of Comparative Example 7, the weight portion of the modified photoconverter powder is 5 parts.

[0072] Experimental example In order to compare and illustrate the performance differences of the adhesive films of different embodiments and comparative examples, the adhesive films of different embodiments and comparative examples were respectively made into photovoltaic module samples to be tested, and the transmittance was tested. The initial module power of different photovoltaic modules and the photovoltaic module power after UV120kWh were tested in accordance with IEC61215. The test results are shown in Table 1.

[0073] The preparation of the photovoltaic module samples to be tested includes: upper glass, upper film, battery cell, lower film, lower glass, all of which are double-glass modules. The upper film and lower film are both the films of the present invention, and the battery cell adopts 210 size HJT battery cell, and finally makes 110 version modules. The initial power of the conventional light-free conversion material module is 585W.

[0074] Table 1 Performance test results of photovoltaic modules corresponding to different adhesive films

[0075] From the above test results, it can be seen that the present invention obtains modified light-conversion powder by compounding a certain proportion of epoxy-modified polystyrene and light-conversion powder, and introduces a certain amount of light-conversion powder into the color film, which can improve the UV aging resistance of the film while ensuring the light transmittance of the color film, and enhance the power of the photovoltaic module.

[0076] According to Example 1 and Comparative Example 1, the transmittance, UV aging resistance and power of the photovoltaic module obtained by blending only epoxy-modified polystyrene and photoconversion powder in Comparative Example 1 are worse than those in Example 1. This is mainly because the epoxy-modified polystyrene and photoconversion powder have strong interaction forces and are prone to form aggregates during the dispersion process, resulting in uneven dispersion and other problems.

[0077] According to Example 1 and Comparative Examples 2 to 3, Comparative Example 2 uses only epoxy-modified polystyrene, which only shows color under sunlight but cannot improve UV aging resistance and power; Comparative Example 3 uses only light-converted powder, which cannot show color under sunlight.

[0078] According to Example 1 and Comparative Examples 4 to 5, in the modified light-conversion powder, when the dosage of the light-conversion powder is too low, the improvement of UV aging resistance and power is not obvious; when the dosage of the light-conversion powder is too high, the component power cannot be further increased, and too much light-conversion powder easily makes the modified light-conversion powder difficult to disperse and affects the transmittance, etc.

[0079] According to Example 1 and Comparative Examples 6 to 7, in the color film, when the amount of the modified photoconversion powder is too low, the improvement of UV aging resistance and power is not obvious; when the amount of the modified photoconversion powder is too high, the degree of dispersion becomes worse, the UV aging resistance is reduced, and the transmittance is affected.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Color film, characterized in that: It comprises a film body and modified light conversion powder dispersed in the film body; in the color film, the mass fraction of the modified light conversion powder is 0.9% to 4%; The modified light-converting powder is mainly prepared from the following raw materials in parts by weight: 100 parts of epoxy-modified polystyrene, 5-50 parts of photoconversion powder, 0.1-5 parts of organic amine catalyst and 50-200 parts of solvent; The photoconversion powder includes at least one of the compounds shown in the structures of the following formulas I to II: 、 。 2. The color adhesive film according to claim 1, characterized in that: The organic amine catalyst includes at least one of triethylamine and benzyldimethylamine.

3. The color adhesive film according to claim 1, characterized in that: The solvent includes xylene.

4. The color adhesive film according to claim 1, characterized in that: The epoxy-modified polystyrene is mainly prepared by copolymerization of styrene and glycidyl methacrylate; In the epoxy-modified polystyrene, the mass content of epoxy groups is 20% to 40%.

5. The color adhesive film according to claim 1, characterized in that: In the modified photoconversion powder, the mass ratio of the epoxy-modified polystyrene to the photoconversion powder is 100:(5-20).

6. The color adhesive film according to claim 1, characterized in that: The particle size of the epoxy-modified polystyrene is 100 to 300 μm.

7. The color adhesive film according to claim 1, characterized in that: The preparation method of the modified light-converting powder comprises: The photoconversion powder and the epoxy-modified polystyrene are dispersed or dissolved in the solvent, and reacted at 50-70° C. under the catalysis of the organic amine catalyst. After the reaction is completed, the precipitate is collected and washed to obtain the modified photoconversion powder.

8. The color adhesive film according to claim 1, characterized in that: The film body comprises the following components in parts by weight: 100 parts of EVA resin, 0.5-1.5 parts of cross-linking agent, 0.1-1 parts of auxiliary cross-linking agent, 0.1-0.5 parts of antioxidant, 0.1-1 parts of light stabilizer and 0.3-1.5 parts of coupling agent.

9. The method for preparing a colored adhesive film according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: uniformly mixing the film body and the modified photoconverter powder in proportion, and extruding and casting the film.

10. A photovoltaic module, characterized in that The invention comprises the colored adhesive film according to any one of claims 1 to 8 or the colored adhesive film prepared by the preparation method according to claim 9.

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