A light-converting encapsulating film and its preparation method

Abstract

This invention discloses a light-converting encapsulating film and its preparation method. It employs a combination of organic fluorescent light-converting materials and rare-earth metal light-converting materials in a suitable ratio. This avoids the problems associated with using a single type of light-converting material, which results in a decrease in film transmittance and thus affects the improvement of component photoelectric conversion efficiency due to large dosage, poor compatibility, and difficulty in uniform dispersion. Furthermore, the light-converting material of this invention undergoes pre-surface treatment and is prepared into a well-compatible masterbatch form along with other additives in powder form, such as UV absorbers, UV stabilizers, and heat stabilizers, and added to the film resin matrix. This not only effectively disperses these additives in the film resin matrix, resulting in an encapsulating film product with high transmittance and uniform performance, but also optimizes the workshop production environment and protects employee health.

Description

Technical Field

[0001] This invention relates to the field of encapsulation materials for solar photovoltaic cell modules, and specifically to a light-converting encapsulation film and its preparation method. Background Technology

[0002] Solar photovoltaic power generation, as a green and renewable energy source, is being prioritized for development by various countries against the backdrop of global efforts to achieve "carbon peaking" and "carbon neutrality." Solar cell modules are the core components that convert light energy into electrical energy; they are made by bonding photovoltaic glass, solar cells, and a backsheet together using a lamination process through an encapsulating film.

[0003] The photoelectric conversion efficiency of solar cells is affected by multiple factors, such as surface reflection, energy loss of high-energy photons, carrier recombination, and the mismatch between the band structure of the cell material and the solar spectrum. Energy loss of high-energy photons and the mismatch between the band structure of the cell material and the solar spectrum are particularly important factors affecting the photoelectric conversion efficiency of solar cells. The spectral response range of solar cells is generally 300–1100 nm, with low responsivity in the ultraviolet and infrared bands; therefore, improving the utilization rate of high-energy photons in the visible and ultraviolet spectral regions of sunlight is crucial for improving the photoelectric conversion efficiency of solar cells.

[0004] A search of existing technologies revealed that patent CN114058271 provides an encapsulating film with different UV absorption bands and its preparation method, which improves the power generation efficiency of the module by adding a UV light conversion agent to the encapsulating film to convert part of the ultraviolet light into visible light that can be absorbed by the solar cell; patent CN110682647 provides an encapsulating film for photovoltaic modules with high photoelectric conversion efficiency, which improves the photoelectric conversion efficiency of the module by coating a lower conversion material layer in the encapsulating film.

[0005] While the above methods can improve the photoelectric conversion efficiency of battery modules to some extent, the improvement is limited. Furthermore, due to the poor compatibility between the light conversion material and the main resin material of the adhesive film, and the small amount of light conversion material added, ensuring the uniform dispersion of the light conversion material within the main adhesive film material and maintaining the film's transmittance without significant impact has always been a challenge for this technology, and the methods described above have not solved this problem.

[0006] In view of this, there is an urgent need in the field to develop a new light-converting encapsulating film to solve the above-mentioned problems existing in the prior art. Summary of the Invention

[0007] This invention addresses the problems existing in the prior art by providing a light-converting encapsulating film and its preparation method, which further improves the light transmittance and photoelectric conversion efficiency of the film.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] As a first aspect of the present invention, the present invention provides a light-converting encapsulating film, which, by weight, comprises: 100 parts of polymer resin, 2-30 parts of functional masterbatch, and 0.5-10 parts of other additives A;

[0010] Preferably, the raw materials include: 100 parts of polymer resin, 5-20 parts of functional masterbatch, and 1-8 parts of other additives A;

[0011] As one embodiment of the present invention, the raw materials of the functional masterbatch include the following components: 100 parts of polymer resin, 1-25 parts of light conversion material A, 1-25 parts of light conversion material B, 0.1-2 parts of surface treatment agent, 0.3-10 parts of dispersant, and 5-30 parts of other additives B;

[0012] Preferably, the raw materials of the functional masterbatch, by weight, include: 100 parts polymer resin, 1-20 parts light conversion material A, 1-20 parts light conversion material B, 0.1-2 parts surface treatment agent, 0.3-10 parts dispersant, and 5-30 parts other additives B;

[0013] In one embodiment of the present invention, the polymer resin is a copolymer of ethylene and butene or octene (POE) and / or a copolymer of ethylene-vinyl acetate (EVA).

[0014] In one embodiment of the present invention, the light conversion material A is an organic fluorescent material selected from at least one of the following: 3-ethyl-7-hydroxy-4,8-dimethyl-coumarin, 6,7-dihydroxycoumarin, 4-methyl-7-dimethylaminecoumarin, 2,5-bis(5-tert-butyl-2-benzoxazolyl)thiophene, 2,2'-(4,4'-stilbene-)bisbenzoxazole, sodium stilbene biphenyl disulfonate, sodium 4,4'-bis(4,6-diphenylaminotriazinyl-2-amino)stilbene-2,2'-disulfonate, bistriazinamine stilbene derivatives, and 1-(p-methanesulfonylphenyl)-3-(p-chlorophenyl)pyrazoline.

[0015] In one embodiment of the present invention, the light conversion material B is a rare earth metal material selected from Ce. 3+ YAG phosphor, Ce 3+ , Yb 3+ YAG phosphor, NaYF4:Tb 3+ , Yb 3+ YVO4: Bi 3+ (Tm 3+ ), Yb 3+ NaYF4: Er 3 +, Yb 3+ NaYF4: Tm 3+ (Er 3+ ), Yb 3+ At least one of them.

[0016] In one embodiment of the present invention, the mass ratio of light conversion material A to light conversion material B is 1:20-20:1; preferably, the total number of parts of light conversion material A and light conversion material B is 2-25 parts.

[0017] As one embodiment of the present invention, the surface treatment agent is selected from at least one of silane coupling agents and silane coupling agent oligomers. The specific type is not limited. Those skilled in the art can select common silane coupling agents and silane coupling agent oligomers as needed, such as KH570, A171, KH550, KH560, Z6030, 3-(methacryloylchloro)propyltrimethyloxysilane, vinyltris(β-methoxyethoxy)silane, methacryloyloxysilane coupling agent oligomers, vinylsilane coupling agent oligomers, vinylpropoxydimethyl oligosilane, etc.

[0018] In one embodiment of the present invention, the dispersant is selected from at least one of the following: ethylene-vinyl acetate grafted with maleic anhydride, ethylene-vinyl acetate grafted with glycidyl methacrylate, ethylene-vinyl acetate grafted with silane coupling agent polymer, POE grafted with maleic anhydride, POE grafted with glycidyl methacrylate, and POE grafted with silane coupling agent polymer.

[0019] As one embodiment of the present invention, the other additive A is an initiator, co-initiator, or tackifier commonly used in photovoltaic encapsulation films. There are no specific limitations on its type, and those skilled in the art can select it as needed. Commonly used initiators include, for example, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 2-ethylhexyl carbonate tert-butyl peroxide, 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, and 2-ethylhexyl carbonate tert-amyl peroxide. Commonly used co-initiators include, for example, triallyl cyanurate, trimethylolpropane trimethacrylate, trimethylolpropane trimethacrylate, triallyl isocyanurate, ethoxylated pentaerythritol tetraacrylate, and 3(ethoxy)trimethylolpropane triacrylate. Commonly used tackifiers include, for example, KH570, methacryloxysilane coupling oligomers, and vinylsilane coupling oligomers.

[0020] In one embodiment of the present invention, the other additive B is a commonly used UV stabilizer, UV absorber, or heat stabilizer in photovoltaic encapsulation films. The specific type is not limited, and those skilled in the art can select according to their needs. Commonly used UV stabilizers include, for example, bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, bis(1-octoxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidinylethanol) succinate, bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, 2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, and 2,4-dichloro-6-(4-morpholinyl)-1,3,5-triazine. Commonly used UV absorbers include, for example, 2-hydroxy-4-n-octoxydiphenyl ether. Ketones, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole, 2-(2-hydroxy-5-methylphenyl)benzotriazole; commonly used heat stabilizers can be exemplified by: pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], 2,6-di-tert-butyl-4-methylphenol, di(2,2,6,6-tetramethyl-4-piperidine) sebacate, N,N'-di-sec-butyl-p-phenylenediamine, and tris(2,4-di-tert-butylphenyl) phosphite.

[0021] As a second aspect of the present invention, the present invention provides a method for preparing the light-converting encapsulating film as described above, comprising the following steps:

[0022] S1: Weigh the raw materials according to the raw material ratio of the functional masterbatch, and first add light conversion material A and light conversion material B into the high-speed mixer;

[0023] S2: Start the high-speed mixer, and spray the surface treatment agent onto the surface of the light conversion material while stirring. Perform surface treatment on the light conversion material for 5-10 minutes, and control the mixing temperature at 30℃-40℃.

[0024] S3: Add the remaining polymer resin, dispersant, and other additives B to the raw materials in S2, and continue mixing for 5-10 minutes;

[0025] S4: Add the raw material obtained in S3 to a twin-screw extruder, melt, extrude, and granulate it in a temperature range of 60℃-150℃ to obtain functional masterbatch;

[0026] S5: Weigh the polymer resin, other additives A and functional masterbatch obtained from S4 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly within the temperature range of 30℃-40℃.

[0027] S6: Add the raw material obtained in S5 into the casting machine and cast it into a film within a temperature range of 60℃-100℃ to obtain a light-converting encapsulating film.

[0028] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0029] The light-converting encapsulating film of this invention uses organic fluorescent light-converting materials and rare earth metal light-converting materials in appropriate proportions. This avoids the problem of reduced film transmittance and thus reduced photoelectric conversion efficiency of the module caused by using a single type of light-converting material, which is difficult to disperse evenly due to large dosage and poor compatibility. At the same time, the combined use of organic fluorescent light-converting materials and rare earth metal light-converting materials can also utilize their different light response in the ultraviolet and infrared regions to convert the light with weak response in the ultraviolet and infrared regions of the solar cell into visible light with sensitive response in the solar cell for absorption, further improving the photoelectric conversion efficiency of the module. In addition, the light-converting materials of this invention are pre-surface treated and prepared into a well-compatible masterbatch form with other additives such as UV absorbers, UV stabilizers, and heat stabilizers in powder form and added to the resin matrix of the encapsulating film. This not only achieves good dispersion of these additives in the resin matrix and obtains encapsulating film products with high transmittance and uniform performance, but also optimizes the workshop production environment and protects the health of employees. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and 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. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. In addition, it is worth noting that, unless otherwise specified, the raw materials involved in the present invention are all commercially available products.

[0031] Example 1

[0032] This embodiment provides a light-converting encapsulating film and its preparation method, the preparation steps of which include:

[0033] S1: Weigh out 100 parts of POE resin (polymer resin), 20 parts of 3-ethyl-7-hydroxy-4,8-dimethyl-coumarin (light conversion material A), and 1 part of Ce according to the raw material ratio of the functional masterbatch. 3+YAG phosphor (light conversion material B), 1 part silane coupling agent KH570 (surface treatment agent), 5 parts POE grafted vinyl silane coupling agent polymer (dispersant), 20 parts other auxiliary agent B (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, 2-hydroxy-4-n-octyloxybenzophenone, tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] pentaerythritol ester, tris(2,4-di-tert-butylphenyl) phosphite), first add light conversion material A and light conversion material B to the high-speed mixer;

[0034] S2: Start the high-speed mixer, spray the surface treatment agent onto the surface of the light conversion material while stirring, and perform surface treatment on the light conversion material for 10 minutes. The mixing temperature is controlled at 30℃.

[0035] S3: Add the remaining polymer resin, dispersant, and other additives B to the raw materials in S2, and continue mixing for 5 minutes;

[0036] S4: Add the raw material obtained in S3 to a twin-screw extruder, melt, extrude, and granulate it at a temperature of 60-150℃ to obtain functional masterbatch;

[0037] S5: Weigh 100 parts of POE resin, 1 part of other additive A (2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, triallyl cyanurate, KH570) and 20 parts of the functional masterbatch obtained in S4 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly at 40°C;

[0038] S6: Add the raw material obtained in S5 into the casting machine and cast it into a film at a temperature of 60-100℃ to obtain a light-converting encapsulating film.

[0039] Example 2

[0040] This embodiment provides a light-converting encapsulating film and its preparation method, the preparation steps of which include:

[0041] S1: Weigh out 100 parts of POE resin (polymer resin), 1 part of 2,5-bis(5-tert-butyl-1,benzoxazol-2-yl)thiophene (light conversion material A), and 20 parts of Ce according to the raw material ratio of the functional masterbatch. 3+ Yb 3+ YAG phosphor (light conversion material B), 1.5 parts vinyl silane coupling agent oligomer (surface treatment agent), 8 parts POE grafted glycidyl methacrylate (dispersant), 25 parts other auxiliary agent B (bis(1-octoxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate, 2-hydroxy-4-methoxybenzophenone, 2,6-di-tert-butyl-4-methylphenol). First, add light conversion material A and light conversion material B to the high-speed mixer.

[0042] S2: Start the high-speed mixer, spray the surface treatment agent onto the surface of the light conversion material while stirring, and perform surface treatment on the light conversion material for 8 minutes. The mixing temperature is controlled at 35℃.

[0043] S3: Add the remaining polymer resin, dispersant, and other additives B to the raw materials in S2, and continue mixing for 8 minutes;

[0044] S4: Add the raw material obtained in S3 to a twin-screw extruder, melt, extrude, and granulate at a temperature of 60-150℃ to obtain functional masterbatch;

[0045] S5: Weigh 100 parts of POE resin, 5 parts of other additives A (2-ethylhexyl carbonate tert-butyl peroxide, trimethylolpropane trimethacrylate, methacryloxysilane coupling agent oligomer) and 15 parts of the functional masterbatch obtained in S4 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly at 35°C;

[0046] S6: Add the raw material obtained in S5 into the casting machine and cast it into a film at a temperature of 60-100℃ to obtain a light-converting encapsulating film.

[0047] Example 3

[0048] This embodiment provides a light-converting encapsulating film and its preparation method, the preparation steps of which include:

[0049] S1: Weigh out 100 parts of POE resin (polymer resin), 10 parts of 1-(p-methanesulfonylphenyl)-3-(p-chlorophenyl)pyrazoline (light conversion material A), and 10 parts of NaYF according to the raw material ratio of the functional masterbatch. 4: Tb 3+ , Yb 3+ (Light conversion material B), 0.5 parts silane coupling agent A171 (surface treatment agent), 0.3 parts POE grafted maleic anhydride (dispersant), 30 parts other additives B (poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol) ester, 2,4-dihydroxybenzophenone, di(2,2,6,6-tetramethyl-4-piperidine) sebacate). First, add light conversion material A and light conversion material B to the high-speed mixer;

[0050] S2: Start the high-speed mixer, spray the surface treatment agent onto the surface of the light conversion material while stirring, and perform surface treatment on the light conversion material for 5 minutes. The mixing temperature is controlled at 30℃.

[0051] S3: Add the remaining polymer resin, dispersant, and other additives B to the raw materials in S2, and continue mixing for 5 minutes;

[0052] S4: Add the raw material obtained in S3 to a twin-screw extruder, melt, extrude, and granulate at a temperature of 60-150℃ to obtain functional masterbatch;

[0053] S5: Weigh 100 parts of POE resin, 1 part of other additive A (1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane, trimethylolpropane trimethacrylate, vinyl silane coupling agent oligomer) and 10 parts of the functional masterbatch obtained in S4 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly at 30°C;

[0054] S6: Add the raw material obtained in S5 into the casting machine and cast it into a film at a temperature of 60-100℃ to obtain a light-converting encapsulating film.

[0055] Example 4

[0056] This embodiment provides a light-converting encapsulating film and its preparation method, the preparation steps of which include:

[0057] S1: Weigh out 100 parts of EVA resin (polymer resin), 20 parts of 4-methyl-7-dimethylamine coumarin (light conversion material A), and 5 parts of NaYF4:Tm according to the raw material ratio of the functional masterbatch. 3+ (Er 3+ ), Yb 3+ (Light conversion material B), 2 parts silane coupling agent KH550 (surface treatment agent), 6 parts EVA grafted maleic anhydride (dispersant), 5 parts other additives B (bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole, N,N'-di-sec-butyl-p-phenylenediamine, tris(2,4-di-tert-butylphenyl) phosphite), first add light conversion material A and light conversion material B to the high-speed mixer;

[0058] S2: Start the high-speed mixer, spray the surface treatment agent onto the surface of the light conversion material while stirring, and perform surface treatment on the light conversion material for 6 minutes. The mixing temperature is controlled at 40℃.

[0059] S3: Add the remaining polymer resin, dispersant, and other additives B to the raw materials in S2, and continue mixing for 10 minutes;

[0060] S4: Add the raw material obtained in S3 to a twin-screw extruder, melt, extrude, and granulate at a temperature of 60-150℃ to obtain functional masterbatch;

[0061] S5: Weigh 100 parts of EVA resin, 8 parts of other additives A (1,1-di-tert-butylperoxide-3,3,5-trimethylcyclohexane, triallyl isocyanurate, KH570, methacryloyloxysilane coupling agent oligomer) and 5 parts of the functional masterbatch obtained in S4 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly at 40°C;

[0062] S6: Add the raw material obtained in S5 into the casting machine and cast it into a film at a temperature of 60-100℃ to obtain a light-converting encapsulating film.

[0063] Example 5

[0064] This embodiment provides a light-converting encapsulating film and its preparation method, the preparation steps of which include:

[0065] S1: Weigh out 100 parts of EVA resin (polymer resin), 4 parts of sodium 4,4'-bis(4,6-diphenylaminotriazinyl-2-amino)stilbene-2,2'-disulfonate (light conversion material A), and 20 parts of YVO4:Bi according to the raw material ratio of the functional masterbatch. 3+ (Tm 3+ ), Yb 3+ (Light conversion material B), 2 parts of silyl methacryloxysilane coupling agent oligomer (surface treatment agent), 10 parts of EVA grafted methacryloxysilane coupling agent oligomer (dispersant), 28 parts of other additives B (2-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-dipentylphenyl)benzotriazole, 2,6-di-tert-butyl-4-methylphenol, tris(2,4-di-tert-butylphenyl) phosphite), first add light conversion material A and light conversion material B to the high-speed mixer;

[0066] S2: Start the high-speed mixer, spray the surface treatment agent onto the surface of the light conversion material while stirring, and perform surface treatment on the light conversion material for 10 minutes. The mixing temperature is controlled at 30℃.

[0067] S3: Add the remaining polymer resin, dispersant, and other additives B to the raw materials in S2, and continue mixing for 5 minutes;

[0068] S4: Add the raw material obtained in S3 to a twin-screw extruder, melt, extrude, and granulate at a temperature of 60-150℃ to obtain functional masterbatch;

[0069] S5: Weigh 100 parts of EVA resin, 6 parts of other additives A (2-ethylhexyl carbonate tert-amyl peroxide, ethoxylated pentaerythritol tetraacrylate, KH570, methacryloxysilane coupling agent oligomer) and 18 parts of the functional masterbatch obtained in S4 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly at 40°C;

[0070] S6: Add the raw material obtained in S5 into the casting machine and cast it into a film at a temperature of 60-100℃ to obtain a light-converting encapsulating film.

[0071] Example 6

[0072] This embodiment provides a light-converting encapsulating film and its preparation method, the preparation steps of which include:

[0073] S1: Weigh out 100 parts of EVA resin (polymer resin), 15 parts of 2,2'-(4,4'-stilbene-)bisbenzoxazole (light conversion material A), and 1 part of NaYF4 according to the raw material ratio of the functional masterbatch. 3+ , Yb 3+ (Light conversion material B), 0.1 parts silane coupling agent Z6030 (surface treatment agent), 1 part EVA grafted glycidyl methacrylate (dispersant), 10 parts other auxiliary agent B (2,4-dichloro-6-(4-morpholino)-1,3,5-triazine, 2-(2-hydroxy-5-methylphenyl)benzotriazole, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]), first add light conversion material A and light conversion material B to the high-speed mixer;

[0074] S2: Start the high-speed mixer, spray the surface treatment agent onto the surface of the light conversion material while stirring, and perform surface treatment on the light conversion material for 7 minutes. The mixing temperature is controlled at 40℃.

[0075] S3: Add the remaining polymer resin, dispersant, and other additives B to the raw materials in S2, and continue mixing for 7 minutes;

[0076] S4: Add the raw material obtained in S3 to a twin-screw extruder, melt, extrude, and granulate at a temperature of 60-150℃ to obtain functional masterbatch;

[0077] S5: Weigh 100 parts of EVA resin, 2 parts of other additives A (2-ethylhexyl carbonate tert-amyl peroxide, 3(ethoxy)trimethylolpropane triacrylate, vinyl silane coupling agent oligomer) and 20 parts of the functional masterbatch obtained in S4 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly at 40°C;

[0078] S6: Add the raw material obtained in S5 into the casting machine and cast it into a film at a temperature of 60-100℃ to obtain a light-converting encapsulating film.

[0079] Comparative Example 1

[0080] Comparative example provides another common type of encapsulating film and its preparation method, the preparation steps of which include:

[0081] S1: Weigh 100 parts of POE resin (polymer resin) and 30 parts of other additives B (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, 2-hydroxy-4-n-octyloxybenzophenone, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and tris(2,4-di-tert-butylphenyl) phosphite) according to the raw material ratio of the functional masterbatch, and add them to a high-speed mixer and mix them evenly at 30°C;

[0082] S2: Add the raw material obtained in S1 to a twin-screw extruder, melt, extrude, and granulate at a temperature of 60-150℃ to obtain functional masterbatch;

[0083] S3: Weigh 100 parts of POE resin, 1 part of other additive A (2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, triallyl cyanurate, KH570) and 10 parts of the functional masterbatch obtained in S2 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly at 40°C;

[0084] S4: Add the raw material obtained in S3 into the casting machine and cast it into a film at a temperature of 60-100℃ to obtain a general type of encapsulating film.

[0085] Comparative Example 2

[0086] This comparative example provides a light-converting encapsulating film and its preparation method, which is the same as the method in Example 1, except that the amount of 3-ethyl-7-hydroxy-4,8-dimethyl-coumarin (light conversion material A) in the functional masterbatch raw material is 21 parts, and Ce is not added. 3+ YAG phosphor (light conversion material B) was used, and the other raw materials and operations were the same as in Example 1.

[0087] Comparative Example 3

[0088] This comparative example provides a light-converting encapsulating film and its preparation method. The method is the same as that in Example 2, except that the Ce in the functional masterbatch raw material is different. 3+ Yb 3+ The amount of YAG phosphor (light conversion material B) was 21 parts, without the addition of 2,5-bis(5-tert-butyl-1,benzoxazol-2-yl)thiophene (light conversion material A). All other raw materials and operations were the same as in Example 1.

[0089] Comparative Example 4

[0090] This comparative example provides a light-converting encapsulating film and its preparation method, which is the same as the method in Example 1, except that the amount of 3-ethyl-7-hydroxy-4,8-dimethyl-coumarin (light conversion material A) in the functional masterbatch raw material is 25 parts, and Ce... 3+ The amount of YAG phosphor (light conversion material B) is 1 part, and the other raw materials and operations are the same as in Example 1.

[0091] Comparative Example 5

[0092] This comparative example provides a light-converting encapsulating film and its preparation method. The raw materials used are the same as in Example 1, but the preparation steps are different. The preparation steps include:

[0093] S1: Weigh the raw materials for the functional masterbatch and the raw materials for the light-converting encapsulating film according to the raw material proportions in Example 1.

[0094] S2: Add all raw materials to the high-speed mixer and mix evenly at 35°C;

[0095] S3: Add the mixed raw materials obtained in S2 into the casting machine and cast the film at a temperature of 60-100℃ to obtain a light-converting encapsulating film.

[0096] Comparative Example 6

[0097] This comparative example provides a light-converting encapsulating film and its preparation method, the preparation steps of which include:

[0098] S1: Weigh out 100 parts of POE resin (polymer resin), 20 parts of 3-ethyl-7-hydroxy-4,8-dimethyl-coumarin (light conversion material A), and 1 part of Ce according to the raw material ratio of the functional masterbatch. 3+ YAG phosphor (light conversion material B), 1 part silane coupling agent KH570 (surface treatment agent), 5 parts POE grafted vinyl silane coupling agent polymer (dispersant), 20 parts other auxiliary agents B (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, 2-hydroxy-4-n-octyloxybenzophenone, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butylphenyl) phosphite);

[0099] S2: Add light conversion material A, light conversion material B, and polymer resin to a high-speed mixer and mix them evenly at 30°C;

[0100] S3: Add the raw material obtained in S2 to a twin-screw extruder, melt, extrude, and granulate at a temperature of 60-150℃ to obtain functional masterbatch;

[0101] S4: Weigh 100 parts of POE resin, 1 part of other additive A (2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, triallyl cyanurate, KH570) and 20 parts of the functional masterbatch obtained in S3 according to the raw material ratio of the light-converting encapsulating film. Add the above raw materials, 1 part of silane coupling agent KH570 (surface treatment agent) weighed in S1, 5 parts of POE grafted vinyl silane coupling agent polymer (dispersant), and 20 parts of other additive B (bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate, 2-hydroxy-4-n-octyloxybenzophenone, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], tris(2,4-di-tert-butylphenyl) phosphite) into a mixing tank and mix the raw materials evenly at 40°C.

[0102] S5: Add the raw material obtained in S4 into the casting machine and cast it into a film at a temperature of 60-100℃ to obtain a light-converting encapsulating film.

[0103] Detection Examples

[0104]

[0105] The transmittance was tested according to GB / T 2410-2008 standard, with a wavelength range of 380nm~1100nm. The photoelectric conversion efficiency (Eff) of the battery module was tested according to IEC61215 standard.

[0106] The test data in the table show that the light-converting encapsulating film prepared by the present invention can not only improve the photoelectric conversion efficiency of the battery module, but also maintain a high transmittance, which can meet the requirements for the encapsulation of solar photovoltaic battery modules.

[0107] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A light-converting encapsulating film, characterized in that, By weight, the raw materials include the following components: 100 parts polymer resin, 5-20 parts functional masterbatch, and 1-8 parts other additives A; the raw materials of the functional masterbatch include the following components: 100 parts polymer resin, 1-20 parts light conversion material A, 1-20 parts light conversion material B, 0.1-2 parts surface treatment agent, 0.3-10 parts dispersant, and 5-30 parts other additives B; Wherein, the light conversion material A is an organic fluorescent material, the light conversion material B is a rare earth metal material; the other additive A is at least one of an initiator, a co-initiator, and a thickener; the other additive B is at least one of a UV stabilizer, a UV absorber, and a heat stabilizer. The light-converting encapsulating film is prepared by the following method: S1: Weigh the raw materials according to the raw material ratio of the functional masterbatch, and first add light conversion material A and light conversion material B into the high-speed mixer; S2: Start the high-speed mixer, and spray the surface treatment agent onto the surface of the light conversion material while stirring. Perform surface treatment on the light conversion material for 5-10 minutes, and control the mixing temperature at 30℃-40℃. S3: Add the remaining polymer resin, dispersant, and other additives B to the raw materials in S2, and continue mixing for 5-10 minutes; S4: Add the raw material obtained in S3 to a twin-screw extruder, melt, extrude, and granulate it in a temperature range of 60℃-150℃ to obtain functional masterbatch; S5: Weigh the polymer resin, other additives A and functional masterbatch obtained from S4 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly within the temperature range of 30℃-40℃. S6: Add the raw material obtained in S5 into the casting machine and cast it into a film within a temperature range of 60℃-100℃ to obtain a light-converting encapsulating film.

2. The light-converting encapsulating film according to claim 1, characterized in that, The polymer resin is POE and / or EVA.

3. The light-converting encapsulating film according to claim 1, characterized in that, The light conversion material A is selected from at least one of 3-ethyl-7-hydroxy-4,8-dimethyl-coumarin, 6,7-dihydroxycoumarin, 4-methyl-7-dimethylaminecoumarin, 2,5-bis(5-tert-butyl-2-benzoxazolyl)thiophene, 2,2'-(4,4'-stilbene-)bisbenzoxazole, sodium stilbene biphenyl disulfonate, sodium 4,4'-bis(4,6-diphenylaminotriazinyl-2-amino)stilbene-2,2'-disulfonate, bistriazinaminostilbene derivatives, and 1-(p-methanesulfonylphenyl)-3-(p-chlorophenyl)pyrazoline; the light conversion material B is selected from Ce 3+ YAG phosphor, Ce 3+ , Yb 3+ YAG phosphor, NaYF4:Tb 3+ , Yb 3+ YVO4: Bi 3+ (Tm 3+ ), Yb 3+ NaYF4: Er 3+ , Yb 3+ NaYF4: Tm 3+ (Er 3+ ), Yb 3+ At least one of them.

4. The light-converting encapsulating film according to claim 1, characterized in that, The mass ratio of light conversion material A to light conversion material B is 1:20-20:1, and the total number of light conversion materials A and B in the functional masterbatch is 2-25 parts.

5. The light-converting encapsulating film according to claim 1, characterized in that, The surface treatment agent is selected from at least one of silane coupling agents and silane coupling agent oligomers; the dispersant is selected from at least one of ethylene-vinyl acetate grafted with maleic anhydride, ethylene-vinyl acetate grafted with glycidyl methacrylate, ethylene-vinyl acetate grafted with silane coupling agent polymer, POE grafted with maleic anhydride, POE grafted with glycidyl methacrylate, and POE grafted with silane coupling agent polymer.

6. The method for preparing the light-converting encapsulating film according to any one of claims 1-5, characterized in that, The preparation method specifically includes the following steps: S1: Weigh the raw materials according to the raw material ratio of the functional masterbatch, and first add light conversion material A and light conversion material B into the high-speed mixer; S2: Start the high-speed mixer, and spray the surface treatment agent onto the surface of the light conversion material while stirring. Perform surface treatment on the light conversion material for 5-10 minutes, and control the mixing temperature at 30℃-40℃. S3: Add the remaining polymer resin, dispersant, and other additives B to the raw materials in S2, and continue mixing for 5-10 minutes; S4: Add the raw material obtained in S3 to a twin-screw extruder, melt, extrude, and granulate it in a temperature range of 60℃-150℃ to obtain functional masterbatch; S5: Weigh the polymer resin, other additives A and functional masterbatch obtained from S4 according to the raw material ratio of the light-converting encapsulating film, and add them to the mixing tank to mix the raw materials evenly within the temperature range of 30℃-40℃. S6: Add the raw material obtained in S5 into the casting machine and cast it into a film within a temperature range of 60℃-100℃ to obtain a light-converting encapsulating film.

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