Triazolic organic compounds and applications thereof, compositions, adhesive films and methods of making and using the same, photovoltaic modules and methods of making the same

Abstract

The application relates to the field of solar cells, and discloses a triazole organic compound and application, a composition, a film and a preparation method and application thereof, a photovoltaic module and a preparation method thereof, the organic compound has a structure shown in formula (I). The organic compound is added into the film, used as ultraviolet light conversion packaging film, applied to a solar cell module, has high visible light transmittance, and has good absorption on ultraviolet absorption.

Description

Technical Field

[0001] This invention relates to the field of solar cells, specifically to triazole organic compounds and their applications, compositions, encapsulant films and their preparation methods and applications, and photovoltaic modules and their preparation methods. Background Technology

[0002] With environmental degradation, ultraviolet radiation is increasingly affecting humans. In the field of solar cells, some cells age severely after exposure to ultraviolet radiation, especially heterojunction modules. Their ultra-high photoelectric conversion efficiency largely stems from the excellent surface passivation ability of intrinsic amorphous silicon over crystalline silicon. However, the drawback is that the TCO film and amorphous silicon film absorb ultraviolet radiation, resulting in lower current in their cells compared to ordinary cells, leading to a decrease in module power.

[0003] Therefore, heterojunction modules have very high requirements for UV resistance. Although UV cut-off layers and UV absorbers can block UV radiation from reaching the module, they also reduce the module's light conversion efficiency. Thus, in the photovoltaic field, it is necessary not only to prevent UV radiation aging of solar cell modules, but also to have high transmittance films in the visible light region, while simultaneously improving the photoelectric conversion efficiency of the modules.

[0004] Light transfer agents are products that can absorb light with negative gain and convert it into light with positive gain. They are added to the film as additives or auxiliaries to form a light transfer film. They can not only absorb ultraviolet light, but also convert the absorbed ultraviolet light into visible light.

[0005] The functional principle of photoconverters is that after the material absorbs energy of a certain wavelength, the electrons are excited to the excited state and are in a high-energy state. This energy can be transferred to the central ion, causing its electrons to jump from the unstable high-energy state back to the stable ground state. At the same time, during the return process, the energy is released in the form of light, thereby realizing photoconversion.

[0006] However, existing encapsulation materials have low visible light transmittance, poor absorption of ultraviolet light, and low efficiency in converting ultraviolet light into visible light, thus limiting their ability to improve the conversion efficiency and weather resistance of solar cells.

[0007] Therefore, it is particularly urgent to develop ultraviolet light converters with high transmittance, the ability to absorb ultraviolet light and convert it into visible light with high efficiency, and high weather resistance. Summary of the Invention

[0008] The purpose of this invention is to overcome the problems in the prior art, such as low transmittance of visible light, poor absorption of ultraviolet light by light conversion materials, and low efficiency in converting ultraviolet light into visible light.

[0009] To achieve the above objectives, a first aspect of the present invention provides an organic compound or its enantiomers containing a triazole structure and an unsaturated double bond structure, the organic compound having the structure shown in formula (I), wherein the organic compound is a cis isomer and / or a trans isomer:

[0010]

[0011] In equation (I),

[0012] L1 and L2 may or may not exist, and L1 and L2 may be the same or different; arbitrarily existing L1 and L2 are each independently composed of C atoms containing or not containing type A heteroatoms. 6-30 The linkage group is provided by the removal of any two H atoms from at least one substance in the aromatic compound; at least one substituent selected from combination A is optionally present on L1 and L2; the heteroatom of type A is selected from at least one of N, O, and S; the combination A is composed of C 1-12 alkyl, C 1-12 alkoxy, C 1-12 alkyl-substituted phenyl, C 1-12 Alkyl-substituted benzyl groups;

[0013] R1 and R2 may be the same or different, and each is independently selected from C that is unsubstituted or substituted by at least one group in combination B. 1-30 The alkyl group, unsubstituted group, or C group substituted with at least one group from combination B 1-30 The alkoxy group, unsubstituted or substituted by at least one group in combination B, of C 3-12 cycloalkyl, unsubstituted or substituted by at least one group in combination B, C 2-20 The alkenyl group, the unsubstituted phenyl group, or the phenyl group substituted by at least one group in combination B;

[0014] Combination B consists of C 1-12 alkyl, C 1-12 alkoxy, cyano, -COO-R 1 -OC(O)-R 1 -C(O)-R 1 -N(R) 2 R 3 C 3-12 cycloalkyl, -S(O)-R 1 Composed of phenyl, naphthyl, benzyl, thiophene, furanyl, benzoxazolyl, dibenzothiophene, and triazine; R 1 R 2 R 3 Each is independently selected from H, cyano, and C. 1-6 One of alkyl, benzyl, thienyl, and furanyl groups.

[0015] The second aspect of the present invention provides the application of the organic compounds containing triazole structures and unsaturated double bond structures, or their enantiomers, as described in the first aspect, in adhesive films.

[0016] A third aspect of the present invention provides a composition for an ultraviolet light conversion encapsulation film, the composition containing a light conversion agent, said light conversion agent containing the organic compound or its enantiomer structure containing a triazole structure and an unsaturated double bond structure as described in the first aspect.

[0017] The fourth aspect of the present invention provides a method for preparing an ultraviolet light conversion encapsulating film, the method using the components of the composition for ultraviolet light conversion encapsulating film described in the third aspect, comprising: sequentially mixing and molding material I containing the components of the composition to obtain the ultraviolet light conversion encapsulating film.

[0018] The fifth aspect of the present invention provides an ultraviolet light conversion encapsulating film obtained by the method for preparing an ultraviolet light conversion encapsulating film as described in the fourth aspect.

[0019] The sixth aspect of this invention provides the application of the ultraviolet light conversion encapsulating film described in the fifth aspect in photovoltaic devices.

[0020] The seventh aspect of the present invention provides a photovoltaic module comprising photovoltaic glass, an encapsulating film layer I, a solar cell, an encapsulating film layer II, and a photovoltaic backsheet arranged in sequence, wherein the materials forming the encapsulating film layer I and the encapsulating film layer II are each independently selected from at least one of the ultraviolet light conversion encapsulating films described in the fifth aspect.

[0021] An eighth aspect of the present invention provides a method for preparing the photovoltaic module described in the seventh aspect, the method comprising:

[0022] (1) Photovoltaic glass, encapsulating film I, solar cell, encapsulating film II and photovoltaic backsheet are stacked in sequence to obtain intermediate body I;

[0023] (2) The intermediate I is subjected to hot pressing to obtain the photovoltaic module;

[0024] The encapsulating film I and the encapsulating film II are each independently selected from at least one of the ultraviolet light conversion encapsulating films described in the fifth aspect.

[0025] The present invention provides an organic compound, which serves as an ultraviolet light conversion agent. The resulting ultraviolet light conversion encapsulation film can significantly reduce the transmittance of ultraviolet light. At the same time, the photoelectric conversion efficiency of photovoltaic modules containing the ultraviolet light conversion encapsulation film of the above-mentioned organic compound is significantly improved. Furthermore, the ultraviolet light conversion encapsulation film containing the organic compound itself has a low yellowing index, thus better maintaining its ultraviolet light absorption performance during use, thereby improving the weather resistance of photovoltaic modules.

[0026] When the organic compound provided by this invention is present in a photovoltaic module, it can not only improve the transmittance of visible light and promote the absorption of visible light by the solar cell, but also increase the conjugated system by introducing olefin molecules containing carbon-carbon double bonds, thereby increasing the radiative transition rate and efficiently converting the absorbed ultraviolet light into visible light for radiation, thus further improving the photoelectric conversion efficiency. Detailed Implementation

[0027] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0028] In this invention, unless otherwise specified, groups of the same type have similar interpretations, and will not be described in detail here.

[0029] The organic compounds described in this invention are represented by cis isomers and / or trans isomers: unless otherwise specified, the structural formulas provided by this invention include both cis and trans forms of the compound, as well as enantiomer mixtures containing both cis and trans structures. Furthermore, the inventors of this invention have discovered in their research that the organic compounds with the structure shown in formula (I) obtained in the examples below of this invention have different configurations depending on the specific structural formula, including cis, trans, and enantiomer mixtures containing both cis and trans structures. The research has found that these compounds, regardless of their configuration, can function in photovoltaic modules. Therefore, to save costs, this invention does not separate the enantiomer mixtures containing both cis and trans structures but directly applies them to photovoltaic modules for performance testing. Therefore, the scope of protection of this invention encompasses cis isomers, trans isomers, and mixtures of enantiomers containing both cis and trans structures of organic compounds. Furthermore, there are no particular requirements regarding the content of the cis and trans structures in the enantiomer mixture; for example, the content of the cis and trans structures in the enantiomer mixture can be 1-99 wt% and 1-99 wt%, respectively, such as 1 wt% and 99 wt%, or 2 wt% and 98 wt%, or 3 wt% and 97 wt%, or 4 wt% and 96 wt%, or 5 wt% and 95 wt%, or 10 wt% and 90 wt%, or 15 wt% and 85 wt%, or 20 wt% and 80 wt%, or... The percentages are 25wt% and 75wt%, or 30wt% and 70wt%, or 35wt% and 65wt%, or 40wt% and 60wt%, or 45wt% and 55wt%, or 50wt% and 50wt%, or 55wt% and 45wt%, or 60wt% and 40wt%, or 65wt% and 35wt%, or 70wt% and 30wt%, or 75wt% and 25wt%, or 80wt% and 20wt%, or 85wt% and 15wt%, or 90wt% and 10wt%, or 95wt% and 5wt%, or 96wt% and 4wt%, or 97wt% and 3wt%, or 98wt% and 2wt%, etc.

[0030] "L1 and L2 exist or do not exist" means that L1 and / or L2 may or may not exist. When L1 and / or L2 exist, the carbon-carbon double bond structure is connected to any position in the benzene ring of the two benzotriazole structures that can be free of H atoms through L1 and L2 respectively; while when L1 or L2 does not exist, the carbon-carbon double bond structure is directly connected to any position in the benzene ring structure of the benzotriazole structure that can be free of H atoms.

[0031] "The arbitrarily existing L1 and L2 are each independently composed of C with or without type A heteroatoms." 6-30 "A linking group provided by the removal of any two H atoms from at least one substance in an aromatic compound" means that, when L1 and / or L2 are present, in the substance providing L1 and L2 linking groups, one H atom is removed from each of two positions where H atoms can be removed to form a linking group; or two H atoms are removed from one position where two H atoms can be removed to form a linking group. The substance providing L1 and L2 linking groups can be selected from C compounds containing or not containing class A heteroatoms. 6-30 At least one of the aromatic compounds, or C, may be selected from those containing or not containing class A heteroatoms. 6-30 At least two of the aromatic compounds may also be selected from C compounds containing or not containing class A heteroatoms. 6-30 At least three of the aromatic compounds. When L1 and L2 are C compounds containing or not containing class A heteroatoms. 6-30 When at least one substance in an aromatic compound leaves any two H atoms to provide a linking group, it indicates that the aromatic compound may or may not contain heteroatoms; if it contains heteroatoms, it is at least one of type A heteroatoms, and the number of heteroatoms may be more than one. Type A heteroatoms can be cyclic atoms or non-cyclic atoms. For example, if L1 and L2 are benzene, then the H atoms at two adjacent, opposite, or alternating positions on the benzene can leave simultaneously to provide a linking group. Further, L1 and L2 may also be substances selected from C... 3-30 The linkage group provided by at least two or at least three structures in the aromatic compound, for example, L1 and L2 can be linkage groups provided by benzene and dibenzothiophene, wherein an H atom is removed from each of the benzene and dibenzothiophene structures at an arbitrary site capable of removing a H atom, thereby linking to the parent nucleus structure.

[0032] It should be noted that "at least one substituent selected from combination A may be present on L1 and L2". When L1 and L2 contain at least one substituent selected from combination A, the number of carbon atoms in the substituent is not counted in the total number of carbon atoms in the L1 and L2 linking groups as defined above.

[0033] C 3-6 Cycloalkanes are cycloalkyl groups provided by 3, 4, 5 or 6 carbon atoms as cyclic atoms.

[0034] C 1-12 Alkyl groups refer to straight-chain or branched alkyl groups with a total number of carbon atoms of 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12).

[0035] C 1-12 The alkoxy group refers to a straight-chain alkoxy or branched-chain alkoxy group with a total number of carbon atoms of 1-12 (e.g., 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12).

[0036] In this invention, the concept of a linking group provided by "phenyl-substituted benzene" and a linking group provided by "biphenyl" are different. A linking group provided by "phenyl-substituted benzene" means that any two H atoms at the sites on the benzene are removed, and the benzene structure is linked to the parent structure as a linking group, and the benzene structure contains a substituent phenyl group. Conversely, a linking group provided by "biphenyl" means that in the two benzene structures of the biphenyl, one H atom is removed at each of the two sites, allowing the biphenyl structure to be linked to the parent structure as a linking group.

[0037] C 3-30 The aromatic compound is defined as having a total number of carbon atoms of 3-30, for example, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30; including but not limited to benzene, diphenyl, terphenyl, naphthalene, anthracene, phenanthrene, etc.

[0038] The alkenyl group described in this invention refers to a substituent containing at least one carbon-carbon double bond. The position of this carbon-carbon double bond is not particularly important; it can be located at the end of the substituent or connected to the parent structure via the carbon-carbon double bond, for example, "C...". 2-20 "Alkenyl" refers to an alkenyl group with a total number of carbon atoms of 2-20, such as 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, where any position can contain one or more carbon-carbon double bonds.

[0039] As previously stated, a first aspect of the present invention provides an organic compound or its enantiomers containing a triazole structure and an unsaturated double bond structure, the organic compound having the structure shown in formula (I), wherein the organic compound is a cis isomer and / or a trans isomer.

[0040] According to a preferred embodiment, in equation (I),

[0041] L1 and L2 may or may not exist, and L1 and L2 may be the same or different; L1 and L2, if optionally present, are each independently a linking group provided by removing any two H atoms from at least one substance selected from benzene, biphenyl, naphthalene, anthracene, phenanthrene, terphenyl, dibenzofuran, pyridine, pyrimidine, triazine, benzothiazole, 9,9-dimethylfluorene, 9,9-diphenylfluorene, thiophene, furan, benzothiphene, benzofuran, dibenzothiphene, pyrene, perylene, and spirodifluorene; L1 and L2 may optionally have at least one substituent selected from combination A; the heteroatom of type A is selected from at least one of N, O, and S; the combination A is composed of C 1-12 alkyl, C 1-12 alkoxy, C 1-12 alkyl-substituted phenyl, C 1-12 Alkyl-substituted benzyl groups;

[0042] R1 and R2 may be the same or different, and each is independently selected from C that is unsubstituted or substituted by at least one group in combination B. 1-24 The alkyl group, unsubstituted group, or C group substituted with at least one group from combination B 1-24 The alkoxy group, unsubstituted or substituted by at least one group in combination B, of C 3-10 cycloalkyl, unsubstituted or substituted by at least one group in combination B, C 2-16 The alkenyl group, the unsubstituted phenyl group, or the phenyl group substituted by at least one group in combination B;

[0043] Combination B consists of C 1-12 alkyl, C 1-12 alkoxy, cyano, -COO-R 1 -OC(O)-R 1 -C(O)-R 1 -N(R) 2 R 3 C 3-12 cycloalkyl, -S(O)-R 1 Composed of phenyl, naphthyl, benzyl, thiophene, furanyl, benzoxazolyl, dibenzothiophene, and triazine; R 1 R 2 R 3 Each is independently selected from H, cyano, and C. 1-6 One of alkyl, benzyl, thienyl, and furanyl groups.

[0044] In another preferred scenario, L1 and L2 are arbitrarily identical.

[0045] According to a preferred embodiment 1, in formula (I),

[0046] L1 and L2 do not exist;

[0047] R1 and R2 may be the same or different, and each is independently selected from C that is unsubstituted or substituted by at least one group in combination B. 1-24 The alkyl group, unsubstituted group, or C group substituted with at least one group from combination B 1-24 The alkoxy group, unsubstituted or substituted by at least one group in combination B, of C 3-10 cycloalkyl, unsubstituted or substituted by at least one group in combination B, C 2-16 The alkenyl group, the unsubstituted phenyl group, or the phenyl group substituted by at least one group in combination B;

[0048] Combination B consists of C 1-12 alkyl, C 1-12 alkoxy, cyano, -COO-R 1 -OC(O)-R 1 -C(O)-R 1 -N(R) 2 R 3 C 3-12 cycloalkyl, -S(O)-R 1 Composed of phenyl, naphthyl, benzyl, thiophene, furanyl, benzoxazolyl, dibenzothiophene, and triazine; R 1 R 2 R 3 Each is independently selected from H, cyano, and C. 1-6 One of alkyl, benzyl, thienyl, and furanyl groups.

[0049] In the preferred embodiment 1, more preferably, the organic compound represented by formula (I) is selected from any one of compound 1 to compound 24 and compound 65.

[0050] According to a preferred embodiment 2, in formula (I),

[0051] L1 and L2 are present and identical; L1 and L2 are linking groups provided by removing any two H atoms from at least one substance selected from benzene, biphenyl, naphthalene, anthracene, phenanthrene, terphenyl, dibenzofuran, pyridine, pyrimidine, triazine, benzothiazole, 9,9-dimethylfluorene, 9,9-diphenylfluorene, thiophene, furan, benzothiphene, benzofuran, dibenzothiphene, pyrene, perylene, and spirodifluorene; L1 and L2 optionally have at least one substituent selected from combination A; the heteroatom of type A is selected from at least one of N, O, and S; the combination A is composed of C 1-12 alkyl, C 1-12 alkoxy, C 1-12 alkyl-substituted phenyl, C 1-12 Alkyl-substituted benzyl groups;

[0052] R1 and R2 may be the same or different, and each is independently selected from C that is unsubstituted or substituted by at least one group in combination B. 1-24 The alkyl group, unsubstituted group, or C group substituted with at least one group from combination B 1-24 The alkoxy group, unsubstituted or substituted by at least one group in combination B, of C 3-10 cycloalkyl, unsubstituted or substituted by at least one group in combination B, C 2-16 The alkenyl group, the unsubstituted phenyl group, or the phenyl group substituted by at least one group in combination B;

[0053] Combination B consists of C 1-12 alkyl, C 1-12 alkoxy, cyano, -COO-R 1 -OC(O)-R 1 -C(O)-R 1 -N(R) 2 R 3 C 3-12 cycloalkyl, -S(O)-R 1 Composed of phenyl, naphthyl, benzyl, thiophene, furanyl, benzoxazolyl, dibenzothiophene, and triazine; R 1 R 2 R 3 Each is independently selected from H, cyano, and C. 1-6 One of alkyl, benzyl, thienyl, and furanyl groups.

[0054] In a preferred embodiment 2, more preferably, the organic compound represented by formula (I) is selected from any one of compounds 25 to 64, and compounds 66 to 72.

[0055] According to the preferred embodiment 3, the organic compound represented by formula (I) is selected from any one of the following:

[0056]

[0057]

[0058]

[0059]

[0060] The organic compounds of this invention are added to the film as an ultraviolet light conversion encapsulation film, which is applied to solar cell modules. It has high visible light transmittance, good absorption of ultraviolet light, and converts ultraviolet light into visible light, thereby significantly improving the conversion efficiency and weather resistance of solar photovoltaic modules.

[0061] This invention does not impose any particular limitation on the specific methods for preparing the aforementioned organic compounds. Those skilled in the art can obtain the aforementioned compounds of this invention by combining the specific structural formulas provided by this invention with known knowledge in the field of organic synthesis. Furthermore, several examples are exemplarily listed below to illustrate the methods for preparing the organic compounds of this invention. Those skilled in the art can also obtain specific methods for preparing all other organic compounds by changing the types of raw materials according to the methods for preparing the organic compounds described below. This invention will not further describe the preparation methods for all organic compounds in detail, and this should not be construed as a limitation of the invention.

[0062] As described in the preceding paragraph, the second aspect of the present invention provides the use of the organic compounds containing triazole structures and unsaturated double bond structures described in the first aspect in adhesive films.

[0063] Preferably, the adhesive film is an encapsulating film. More preferably, the adhesive film is a light conversion encapsulating film. Particularly preferably, the adhesive film is an ultraviolet light conversion encapsulating film.

[0064] As previously described, a third aspect of the present invention provides a composition for an ultraviolet light conversion encapsulation film, the composition containing a light conversion agent, said light conversion agent containing the organic compound with a triazole structure and an unsaturated double bond structure described in the first aspect.

[0065] Preferably, the composition further comprises a matrix material and at least one auxiliary agent selected from photoinitiators, light stabilizers, crosslinking agents, co-crosslinking agents, antioxidants, and silane coupling agents; relative to 100 parts by weight of the matrix material, the content of the light conversion agent is 0.005-2 parts, the content of the photoinitiator is 0-2 parts by weight, the content of the light stabilizer is 0.1-1 parts by weight, the content of the crosslinking agent is 0-3 parts by weight, the content of the co-crosslinking agent is 0-2 parts by weight, the content of the antioxidant is 0.05-1 parts by weight, and the content of the silane coupling agent is 0.2-1 parts by weight.

[0066] More preferably, relative to 100 parts by weight of the matrix material, the content of the photoconverter is 0.01-1 parts, the content of the photoinitiator is 0.1-2 parts by weight, the content of the light stabilizer is 0.1-1 parts by weight, the content of the crosslinking agent is 0.1-3 parts by weight, the content of the co-crosslinking agent is 0.1-2 parts by weight, the content of the antioxidant is 0.05-1 parts by weight, and the content of the silane coupling agent is 0.2-1 parts by weight.

[0067] In a preferred embodiment, the matrix material is an ethylene copolymer.

[0068] More preferably, the matrix material is selected from at least one of ethylene-vinyl acetate copolymer, ethylene-butene copolymer, ethylene-octene copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate-based multi-component copolymer, ethylene-methyl acrylate-based multi-component copolymer, ethylene-ethyl acrylate-based multi-component copolymer, ethylene-methyl methacrylate-based multi-component copolymer, ethylene-ethyl methacrylate-based multi-component copolymer, and ethylene-α-olefin copolymer. Particularly preferably, the matrix material is ethylene-vinyl acetate copolymer.

[0069] According to a particularly preferred embodiment, the matrix material is an ethylene-vinyl acetate copolymer, and the content of vinyl acetate structural units in the ethylene-vinyl acetate copolymer is 25-35 wt%, the melt index of the ethylene-vinyl acetate copolymer is 0.1-40 g / min, the melting point is 40-90℃, and the light transmittance is ≥90%.

[0070] Preferably, the photoinitiator is selected from any one or a mixture of at least two of the following: 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, benzophenone, (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone, 2-hydroxy-2-methyl-1-phenylpropanone (2-hydroxy-1-(4-(2-hydroxy-2-methylpropionylphenyl)benzyl)-2-methyl-1-propanone, titanoceramsite photoinitiators, thiopyridinone / iodonium salt systems, organic peroxide systems, borate / dye systems, hexaaryl diimidazole / dye systems, coumarin ketone / dye systems, benzoyl ketal photoinitiators, acetophenone photoinitiators, anthraquinone photoinitiators and their derivatives, benzoate photoinitiators, bicyclic diketone compounds, and camphorquinone.

[0071] Preferably, the light stabilizer is selected from one or a mixture of at least two of the following: bis(2,2,6,6-tetramethyl-4-piperidinol) sebacic acid ester, bis-2,2,6,6-tetramethylpiperidinol sebacic acid ester, 2-(2'-hydroxy-5'-methylphenyl)-benzotriazole, [[3,5-di-tert-butyl-4-hydroxyphenyl]methyl]butylmalonate di(1,2,2,6,6-pentamethyl-4-piperidinol) ester, bis(2,2,6,6-tetramethyl-4-piperidinol) sebacic acid ester, and 2,4-dichloro-6-(4-morpholino)-1,3,5-triazine.

[0072] In a preferred embodiment, the crosslinking agent is selected from one or a mixture of at least two of the following: 2-ethylhexyl carbonate tert-butyl peroxide, tert-butyl peroxide-isopropyl carbonate, cyclohexanone peroxide, tert-butyl hydrogen peroxide, dicumyl peroxide, di(tert-butyl peroxide-isopropyl)benzene, benzoyl peroxide, di(2,4-dichlorobenzoyl peroxide), tert-butyl peroxybenzoate, tert-butyl peroxycarbonate-2-ethylhexyl peroxide, tert-butyl peracetic acid, tert-butyl peroxide-3,5,5-trimethylhexanoate, di(4-tert-butylcyclohexanone) peroxybicarbonate, tert-amyl peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 1,1-di-tert-butyl peroxycyclohexane, and 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane.

[0073] Preferably, the crosslinking agent is selected from one or a mixture of at least two of triallyl isocyanurate, ethylene glycol dimethacrylate, N,N′-m-phenylbismaleimide, trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, propanetriol triacrylate, and ethoxylated pentaerythritol tetraacrylate.

[0074] In a preferred embodiment, the antioxidant is selected from one or a mixture of at least two of the following: 2,6-di-tert-butyl-p-cresol, di(2,4-dicumylphenyl)pentaerythritol diphosphite, distearate pentaerythritol diphosphite, β-(3,5-di-tert-butyl-4-hydroxybenzyl)propionate, 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)isocyanuric acid, β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate n-octadecyl alcohol, tetrakis(β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate)pentaerythritol ester, 2,2'-methylenebis(4-methyl-6-tert-butylphenol), tetrakis(2,4-di-tert-butylphenyl-4,4'-biphenyl) diphosphite, tris(2,4-di-tert-butylphenyl) phosphite, and tris(nonylphenyl) phosphite.

[0075] Preferably, the silane coupling agent is selected from one or a mixture of at least two of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltris(2-methoxyethoxy)silane, 3-triethoxysilyl-1-propylamine, (triethoxysilyl)ethylene, γ-glycidoxypropyltrimethoxysilane, vinyltrichlorosilane, γ-methacryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropyltriisopropoxysilane, 3-thiopropyltrimethoxysilane, and 3-thiopropyltriethoxysilane.

[0076] As previously described, a fourth aspect of the present invention provides a method for preparing an ultraviolet light conversion encapsulating film, the method using the components of the composition for ultraviolet light conversion encapsulating film described in the third aspect, comprising: sequentially mixing and molding material I containing the components of the composition to obtain the ultraviolet light conversion encapsulating film.

[0077] Preferably, the method includes: uniformly mixing a matrix material, an ultraviolet light conversion agent, a light stabilizer, a crosslinking agent, a co-crosslinking agent, an antioxidant, and a silane coupling agent, and then sequentially performing kneading and casting molding to obtain the ultraviolet light conversion encapsulation film.

[0078] Preferably, the casting process is carried out in a casting machine, through plasticizing extrusion, stretching, traction, and winding, to obtain the ultraviolet light conversion encapsulation film.

[0079] Preferably, the mixing conditions include: a mixing temperature of 70℃-120℃; a mixing time of 10min-40min; and a stirring speed of 100rpm-300rpm.

[0080] As previously stated, the fifth aspect of the present invention provides an ultraviolet light conversion encapsulating film obtained by the method for preparing an ultraviolet light conversion encapsulating film as described in the fourth aspect.

[0081] Preferably, the thickness of the ultraviolet light conversion encapsulation film is 0.3mm-0.8mm. Particularly preferably, the thickness of the ultraviolet light conversion encapsulation film is 0.5mm.

[0082] As previously stated, the sixth aspect of the present invention provides the application of the ultraviolet light conversion encapsulating film described in the fifth aspect in photovoltaic devices.

[0083] As previously described, the seventh aspect of the present invention provides a photovoltaic module comprising photovoltaic glass, an encapsulating film layer I, a solar cell, an encapsulating film layer II, and a photovoltaic backsheet arranged in sequence, wherein the materials forming the encapsulating film layer I and the encapsulating film layer II are each independently selected from at least one of the ultraviolet light conversion encapsulating films described in the fifth aspect.

[0084] As previously stated, the eighth aspect of the present invention provides a method for preparing the photovoltaic module described in the seventh aspect, the method comprising:

[0085] (1) Photovoltaic glass, encapsulating film I, solar cell, encapsulating film II and photovoltaic backsheet are stacked in sequence to obtain intermediate body I;

[0086] (2) The intermediate I is subjected to hot pressing to obtain the photovoltaic module;

[0087] The encapsulating film I and the encapsulating film II are each independently selected from at least one of the ultraviolet light conversion encapsulating films described in the fifth aspect.

[0088] Preferably, in step (2), the conditions for the hot pressing treatment include: heating temperature of 80-170℃, pressing pressure of 40KPa-70KPa, and pressing time of 15-30min.

[0089] The present invention will be described in detail below through examples.

[0090] For the following examples where specific experimental steps or conditions are not specified, the procedures or conditions described in the literature of this field can be followed. Reagents or instruments whose manufacturers are not specified are all commercially available standard products.

[0091] Unless otherwise specified, room temperature as mentioned below refers to 25±1℃.

[0092] The ethylene-vinyl acetate copolymer used in this invention has a vinyl acetate structural unit content of 28 wt%, a melt index of 20 g / 10 min (under test conditions of 190 °C / 2.16 kg), and a melting point of 75 °C.

[0093] Preparation Example 1: Synthesis of Compound 2

[0094]

[0095] Synthesis of intermediate 2-1: 0.1 mol of 5-chloro-2H-benzo[1,2,3]triazole was dissolved in 120 mL of toluene, and 0.1 mol of 1-bromohexane, 0.25 mol of sodium tert-butoxide, 0.3 mmol of tris(dibenzylacetone)dipalladium, and 0.3 mmol of tritert-butylphosphine were added. The mixture was stirred under nitrogen and heated to reflux. After 4 h, the reaction was confirmed to be complete. The reaction solution was evaporated to dryness under reduced pressure and the intermediate 2-1 was obtained by column chromatography (yield: 67.1%).

[0096] Synthesis of intermediate 2-2: 0.06 mol of intermediate 2-1 was dissolved in 350 mL of 1,4-dioxane solvent and stirred under nitrogen purging. 0.06 mol of pinacol diborate, 0.15 mol of potassium acetate, and 0.18 mmol of ferrocene palladium dichloride were added sequentially. The mixture was heated to reflux and reacted. After 4 h, HPLC analysis showed that the reactants had basically reacted completely. The reaction was stopped, and the reaction solution was evaporated to dryness under reduced pressure. The residue was then subjected to column chromatography to obtain intermediate 2-2 (yield: 76.9%).

[0097] Synthesis of Compound 2: 0.02 mol of 1,2-dibromoethylene was dissolved in 550 mL of toluene solvent, nitrogen gas was introduced and stirred, and 0.04 mol of intermediate 2-2, 0.1 mol of potassium carbonate and 0.12 mmol of tetra(triphenylphosphine)palladium were added sequentially. The mixture was heated to reflux, and after 6 h, HPLC analysis showed that the starting material was basically completely reacted. The reaction was stopped, cooled, and filtered to obtain the crude product. The crude product was completely dissolved in toluene, and the filtrate was evaporated to dryness under reduced pressure. The residue was subjected to column chromatography to obtain Compound 2 (yield: 79.2%).

[0098] Mass spectrometry: C26H34N6, theoretical value: 430.28, measured value: 430.25. 1H-NMR (400MHz, CDCl3) (ppm) δ=0.84~0.95(6H, m), 1.17~1.41(12H, m), 1.88~2.02(4H, m), 4.06~4.17(4H, m), 6.93~6.96(2H, s), 7.51~7.57(2H, m), 7.92~7.99(4H, m).

[0099] Preparation Example 2: Synthesis of Compound 6

[0100]

[0101] Synthesis of intermediate 6-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 6-1 (yield: 71.0%).

[0102] Synthesis of intermediate 6-2: The synthesis method is the same as that of intermediate 2-2, yielding intermediate 6-2 (yield: 77.0%).

[0103] Synthesis of compound 6: The synthesis method was the same as that of compound 2, yielding intermediate 6 (yield: 78.7%).

[0104] Mass spectrometry: C26H18N6, theoretical value: 414.16, measured value: 414.15. 1H-NMR (400MHz, CDCl3) (ppm) δ=6.93~6.96 (2H, m), 7.53~7.66 (6H, m), 7.71~7.77 (2H, m), 7.93~7.99 (2H, m), 8.01~8.14 (6H, s).

[0105] Preparation Example 3: Synthesis of Compound 16

[0106]

[0107] Synthesis of intermediate 16-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 16-1 (yield: 72.3%).

[0108] Synthesis of intermediate 16-2: The synthesis method is the same as that of intermediate 2-2, yielding intermediate 16-2 (yield: 77.2%).

[0109] Synthesis of compound 16: The synthesis method was the same as that of compound 2, yielding intermediate 16 (yield: 77.4%).

[0110] Mass spectrometry: C22H26N6, theoretical value: 374.22, measured value: 374.20. 1H-NMR (400MHz, CDCl3) (ppm) δ=0.87~0.94 (12H, d), 1.97~2.13 (2H, m), 4.88~4.99 (4H, m), 6.94~6.96 (2H, s), 7.94~7.54 (2H, m), 7.94~8.00 (4H, m).

[0111] Preparation Example 4: Synthesis of Compound 28

[0112]

[0113] Synthesis of intermediate 28-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 28-1 (yield: 73.3%).

[0114] Synthesis of intermediate 28-2: The synthesis method is the same as that for intermediate 2-2, yielding intermediate 28-2 (yield: 78.1%).

[0115] Synthesis of compound 28: The synthesis method was the same as that of compound 2, yielding intermediate 28 (yield: 78.7%).

[0116] Mass spectrometry: C34H30N6, theoretical value: 522.25, measured value: 522.26. 1H-NMR (400MHz, CDCl3) (ppm) δ=2.47~2.58 (4H, m), 4.06~4.19 (4H, m), 4.89~5.03 (4H, m), 5.72~5.88 (2H, m), 6.88~6.92 (2H, s), 7.54~7.67 (8H, m), 7.80~7.87 (2H, m), 8.12~8.18 (2H, d), 8.29~8.32 (2H, d).

[0117] Preparation Example 5: Synthesis of Compound 32

[0118]

[0119] Synthesis of intermediate 32-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 32-1 (yield: 73.9%).

[0120] Synthesis of intermediate 32-2: The synthesis method is the same as that of intermediate 2-2, yielding intermediate 32-2 (yield: 79.2%).

[0121] Synthesis of compound 32: The synthesis method was the same as that of compound 2, yielding intermediate 32 (yield: 79.7%).

[0122] Mass spectrometry: C32H26N6O4, theoretical value: 558.20, measured value: 558.19. 1H-NMR (400MHz, CDCl3) (ppm) δ=2.07~2.11(6H, s), 6.89~6.91(2H, s), 7.05~7.08(4H, s), 7.54~7.67(8H, m), 7.81~7.86(2H, m), 8.13~8.17(2H, d), 8.29~8.31(2H, d).

[0123] Preparation Example 6: Synthesis of Compound 34

[0124]

[0125] Synthesis of intermediate 34-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 34-1 (yield: 72.6%).

[0126] Synthesis of intermediate 34-2: The synthesis method is the same as that for intermediate 2-2, yielding intermediate 34-2 (yield: 77.5%).

[0127] Synthesis of intermediate 34-3: The synthesis method was the same as that of compound 2, yielding intermediate 34-3 (yield: 79.3%).

[0128] Synthesis of compound 34: The synthesis method was the same as that of compound 2, yielding intermediate 34 (yield: 79.1%).

[0129] Mass spectrometry: C36H38N6, theoretical value: 554.32, measured value: 554.30. 1H-NMR (400MHz, CDCl3) (ppm) δ=0.85~0.92 (6H, m), 1.19~1.33 (4H, m), 1.88~2.02 (4H, m), 2.40~2.44 (6H, s), 4.09~4.18 (4H, m), 6.94~6.96 (2H, s), 7.29~7.31 (2H, m), 7.37~7.39 (2H, m), 7.62~7.64 (2H, m), 7.83~7.88 (2H, m), 8.13~8.17 (2H, d), 8.29~8.31 (2H, d).

[0130] Preparation Example 7: Synthesis of Compound 38

[0131]

[0132] Synthesis of intermediate 38-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 38-1 (yield: 71.6%).

[0133] Synthesis of intermediate 38-2: The synthesis method is the same as that for intermediate 2-2, yielding intermediate 38-2 (yield: 78.5%).

[0134] Synthesis of intermediate 38-3: The synthesis method was the same as that for compound 2, yielding intermediate 38-3 (yield: 79.3%).

[0135] Synthesis of compound 38: The synthesis method was the same as that of compound 2, yielding intermediate 38 (yield: 80.1%).

[0136] Mass spectrometry: C38H30N6, theoretical value: 570.25, measured value: 570.24. 1H-NMR (400MHz, CDCl3) (ppm) δ=1.32~1.41 (6H, m), 4.32~4.42 (4H, m), 6.94~6.96 (2H, s), 7.35~7.44 (4H, m), 7.54~7.62 (2H, m), 7.82~7.87 (2H, m), 7.93~8.00 (4H, m), 8.12~8.18 (2H, d), 8.30~8.33 (2H, d), 8.92~8.98 (2H, m).

[0137] Preparation Example 8: Synthesis of Compound 48

[0138]

[0139] Synthesis of intermediate 48-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 48-1 (yield: 70.9%).

[0140] Synthesis of intermediate 48-2: The synthesis method is the same as that for intermediate 2-2, yielding intermediate 48-2 (yield: 77.1%).

[0141] Synthesis of intermediate 48-3: The synthesis method was the same as that of compound 2, yielding intermediate 48-3 (yield: 77.9%).

[0142] Synthesis of compound 48: The synthesis method was the same as that of compound 2, yielding intermediate 48 (yield: 78.6%).

[0143] Mass spectrometry: C46H28N8, theoretical value: 692.24, measured value: 692.25. 1H-NMR (400MHz, CDCl3) (ppm) δ=5.94~5.98 (4H, s), 6.94~6.96 (2H, s), 7.37~7.53 (8H, m), 7.92~7.97 (2H, m), 8.13~8.22 (6H, m), 8.29~8.35 (4H, m), 8.39~8.42 (2H, d).

[0144] Preparation Example 9: Synthesis of Compound 52

[0145]

[0146] Synthesis of intermediate 52-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 52-1 (yield: 69.9%).

[0147] Synthesis of intermediate 52-2: The synthesis method is the same as that for intermediate 2-2, yielding intermediate 52-2 (yield: 76.9%).

[0148] Synthesis of intermediate 52-3: The synthesis method was the same as that of compound 2, yielding intermediate 52-3 (yield: 78.4%).

[0149] Synthesis of compound 52: The synthesis method was the same as that of compound 2, yielding intermediate 52 (yield: 77.8%).

[0150] Mass spectrometry: C34H24N8S2, theoretical value: 608.16, measured value: 608.15. 1H-NMR (400MHz, CDCl3) (ppm) δ=6.24~6.29(4H, d), 6.64~6.70(2H, m), 6.83~6.91(2H, m), 6.93~6.97(2H, s), 7.01~7.07(2H, m), 7.36~7.42(2H, m), 7.74~7.80(2H, d), 8.03~8.18(4H, m), 8.22~8.26(2H, d), 8.60~8.63(2H, d).

[0151] Preparation Example 10: Synthesis of Compound 56

[0152]

[0153] Synthesis of intermediate 56-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 56-1 (yield: 72.1%).

[0154] Synthesis of intermediate 56-2: The synthesis method is the same as that for intermediate 2-2, yielding intermediate 56-2 (yield: 77.2%).

[0155] Synthesis of intermediate 56-3: The synthesis method was the same as that for compound 2, yielding intermediate 56-3 (yield: 77.5%).

[0156] Synthesis of compound 56: The synthesis method was the same as that of compound 2, yielding intermediate 56 (yield: 77.1%).

[0157] Mass spectrometry: C44H30N6O2, theoretical value: 674.24, measured value: 674.25. 1H-NMR (400MHz, CDCl3) (ppm) δ=2.18~2.22(6H, m), 4.32~4.36(4H, m), 6.94~6.96(2H, s), 7.53~7.73(8H, m), 7.87~7.92(2H, m), 8.06~8.09(2H, d), 8.13~8.18(2H, d), 8.25~8.28(2H, d), 8.36~8.39(2H, d).

[0158] Preparation Example 11: Synthesis of Compound 57

[0159]

[0160] Synthesis of intermediate 57-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 57-1 (yield: 73.3%).

[0161] Synthesis of intermediate 57-2: The synthesis method is the same as that for intermediate 2-2, yielding intermediate 57-2 (yield: 76.2%).

[0162] Synthesis of intermediate 57-3: The synthesis method was the same as that of compound 2, yielding intermediate 57-3 (yield: 76.9%).

[0163] Synthesis of compound 57: The synthesis method was the same as that of compound 2, yielding intermediate 57 (yield: 76.9%).

[0164] Mass spectrometry: C24H18N6S2, theoretical value: 454.10, measured value: 454.09. 1H-NMR (400MHz, CDCl3) (ppm) δ=4.38~4.42 (6H, s), 6.99~7.01 (2H, s), 7.13~7.16 (2H, d), 7.67~7.71 (2H, m), 7.83~7.85 (2H, d), 8.13~8.17 (4H, m).

[0165] Preparation Example 12: Synthesis of Compound 61

[0166]

[0167] Synthesis of intermediate 61-1: The synthesis method was the same as that of compound 2, yielding intermediate 61-1 (yield: 75.7%).

[0168] Synthesis of compound 61: The synthesis method was the same as that of compound 2, yielding intermediate 61 (yield: 77.4%).

[0169] Mass spectrometry: C32H22N6S2, theoretical value: 554.13, measured value: 554.15. 1H-NMR (400MHz, CDCl3) (ppm) δ=4.45~4.49 (6H, s), 7.53~7.55 (2H, s), 7.87~7.92 (2H, m), 8.06~8.17 (6H, m), 8.33~8.35 (2H, d), 8.38~8.46 (4H, m).

[0170] Preparation Example 13: Synthesis of Compound 66

[0171]

[0172] Synthesis of intermediate 66-1: The synthesis method is the same as that of intermediate 2-1, yielding intermediate 66-1 (yield: 71.9%).

[0173] Synthesis of intermediate 66-2: The synthesis method is the same as that of intermediate 2-2, yielding intermediate 66-2 (yield: 75.7%).

[0174] Synthesis of compound 66: The synthesis method was the same as that of compound 2, yielding intermediate 66 (yield: 76.9%).

[0175] Mass spectrometry: C40H30N6O2, theoretical value: 626.24, measured value: 626.25. 1H-NMR (400MHz, CDCl3) (ppm) δ=3.77~3.80 (6H, s), 6.89~6.96 (6H, m), 7.54~7.67 (12H, m), 7.82~7.87 (2H, m), 8.13~8.17 (2H, d), 8.32~8.34 (2H, d).

[0176] Example of encapsulating film:

[0177] The preparation method of the encapsulating film includes the following steps:

[0178] The matrix material, UV conversion agent, photoinitiator, light stabilizer, crosslinking agent, co-crosslinking agent, antioxidant and silane coupling agent are mixed evenly in a mixing tank and then fed into a twin-screw extruder. The mixture is kneaded at 90°C and 200 rpm. After that, it is plasticized, extruded, stretched, drawn and wound in a casting machine to obtain a UV conversion encapsulation film with a thickness of 0.5 mm.

[0179] Example 1 of encapsulating film:

[0180] This embodiment provides an ultraviolet light conversion encapsulating film, prepared using the above-described preparation method. The base material is 100g of ethylene-vinyl acetate copolymer, the ultraviolet light converter is 0.1g of compound 2, the photoinitiator is 1g of 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone, the light stabilizer is 0.1g of 2,4-dichloro-6-(4-morpholino)-1,3,5-triazine, the crosslinking agent is 0.5g of dicumyl peroxide, the co-crosslinking agent is 0.5g of triallyl isocyanurate, the antioxidant is 0.05g of tri(nonylphenyl) phosphite, and the silane coupling agent is 0.2g of 3-thiopropyltriethoxysilane.

[0181] Example 2 of encapsulating film:

[0182] This embodiment provides an ultraviolet light conversion encapsulating film, which is prepared using the same method as the encapsulating film in Embodiment 1, except that:

[0183] In this embodiment, the ultraviolet light converter is 0.05g of compound 2.

[0184] Everything else is the same as in Example 1 of the encapsulating film.

[0185] Example 3 of encapsulating film:

[0186] This embodiment provides an ultraviolet light conversion encapsulating film, which is prepared using the same method as the encapsulating film in Embodiment 1, except that:

[0187] In this embodiment, the ultraviolet light converter is 0.3g of compound 2.

[0188] Everything else is the same as in Example 1 of the encapsulating film.

[0189] Example 4 of encapsulating film:

[0190] This embodiment provides an ultraviolet light conversion encapsulating film, which is prepared using the same method as the encapsulating film in Embodiment 1, except that:

[0191] In this embodiment, the silane coupling agent is 0.2g of γ-methacryloxypropyltriisopropoxysilane (that is, the same weight of γ-methacryloxypropyltriisopropoxysilane is used to replace 3-thiopropyltriethoxysilane in encapsulation film embodiment 1), and the rest are the same as in encapsulation film embodiment 1.

[0192] Encapsulation film Examples 5-20:

[0193] Encapsulating films Examples 5-20 were prepared using a method similar to that used in Encapsulating Film Example 1, except that compound 2 in Encapsulating Film Example 1 was replaced with the compounds listed in Table 1.

[0194] Comparative examples of encapsulating films: 1-3

[0195] Comparative Examples 1-3 were prepared using a method similar to that used in Example 1 of the encapsulating film, except that compound 2 in Example 1 of the encapsulating film was replaced with Ref1, Ref2, and Ref3, respectively.

[0196]

[0197] Test case

[0198] Performance tests were performed on the ultraviolet light conversion encapsulating films obtained in Examples 1-20 and Comparative Examples 1-3:

[0199] The transmittance test standard is in accordance with GB / T29848-2018. The transmittance test is conducted using a specific UV-Vis spectrophotometer (PerkinElmer LAMBDA 950); the test is performed in the visible light band.

[0200] The test for resistance to ultraviolet radiation was conducted in accordance with the International Electrotechnical Commission standard IEC 61345. Test conditions: sample surface temperature 60℃, wavelength 280-400nm, radiation intensity 15kWh / m². 2 The irradiation time was 1000 hours. Characterization method: Yellowing index (ΔYi) was tested according to GB2409-80 "Test Method for Yellow Index of Plastics".

[0201] Photovoltaic modules containing encapsulating films (Examples 1-20 and Comparative Examples 1-3) were subjected to photoelectric conversion efficiency tests. The photovoltaic modules were prepared as follows: photovoltaic glass, ultraviolet conversion encapsulating film, solar cells, ultraviolet conversion encapsulating film, and photovoltaic backsheet were neatly stacked and placed in a laminator for lamination at 100°C for 20 minutes at a lamination pressure of 60 kPa. The modules were then removed and cooled to obtain the photovoltaic modules described above. (The two ultraviolet conversion encapsulating films in the same photovoltaic module are of the same type).

[0202] Photovoltaic conversion efficiency test: A standard sunlight beam was emitted using a solar simulator for testing (spectral AM 1.5G, incident power 100mW / cm²). 2 (Temperature 25℃).

[0203] The test results are shown in Table 1.

[0204] The method for calculating the photoelectric conversion efficiency improvement rate in Table 1 is as follows: the photoelectric conversion efficiency of Comparative Example 1 of the encapsulating film is taken as the comparison standard of 100%, and the photoelectric conversion efficiency of the other encapsulating films is compared with it to calculate the improvement rate.

[0205] Photoelectric conversion efficiency improvement % = (Photoelectric conversion efficiency of the encapsulating film in the current example - Photoelectric conversion efficiency of the encapsulating film in Comparative Example 1) / Photoelectric conversion efficiency of the encapsulating film in Comparative Example 1 × 100%

[0206] Table 1

[0207]

[0208]

[0209] The results above demonstrate that the organic compounds provided by this invention, when added to the encapsulant film, particularly when used as an ultraviolet light conversion encapsulant film in solar cell modules, offer the advantage of high visible light transmittance. They exhibit good absorption of ultraviolet light and can convert it into visible light, thereby significantly improving the light conversion efficiency and weather resistance of solar photovoltaic modules.

[0210] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. An organic compound containing a triazole structure and an unsaturated double bond structure, or its enantiomers thereof, characterized in that, The organic compound has the structure shown in formula (I), wherein the organic compound is a cis isomer and / or a trans isomer: In equation (I), L1 and L2 may or may not exist, and L1 and L2 may be the same or different; arbitrarily existing L1 and L2 are each independently composed of C atoms containing or not containing type A heteroatoms. 6-30 The linkage group is provided by the removal of any two H atoms from at least one substance in the aromatic compound; at least one substituent selected from combination A is optionally present on L1 and L2; the heteroatom of type A is selected from at least one of N, O, and S; the combination A is composed of C 1-12 alkyl, C 1-12 alkoxy, C 1-12 alkyl-substituted phenyl, C 1-12 Alkyl-substituted benzyl groups; R1 and R2 may be the same or different, and each is independently selected from C that is unsubstituted or substituted by at least one group in combination B. 1-30 The alkyl group, unsubstituted group, or C group substituted with at least one group from combination B 1-30 The alkoxy group, unsubstituted or substituted by at least one group in combination B, of C 3-12 cycloalkyl, unsubstituted or substituted by at least one group in combination B, C 2-20 The alkenyl group, the unsubstituted phenyl group, or the phenyl group substituted by at least one group in combination B; Combination B consists of C 1-12 alkyl, C 1-12 alkoxy, cyano, -COO-R 1 -OC(O)-R 1 -C(O)-R 1 -N(R) 2 R 3 C 3-12 cycloalkyl, -S(O)-R 1 Composed of phenyl, naphthyl, benzyl, thiophene, furanyl, benzoxazolyl, dibenzothiophene, and triazine; R 1 R 2 R 3 Each is independently selected from H, cyano, and C. 1-6 One of alkyl, benzyl, thienyl, and furanyl groups.

2. The organic compound or its enantiomer structure according to claim 1, characterized in that, In equation (I), L1 and L2 may or may not exist, and L1 and L2 may be the same or different; L1 and L2, if optionally present, are each independently a linking group provided by removing any two H atoms from at least one substance selected from benzene, biphenyl, naphthalene, anthracene, phenanthrene, terphenyl, dibenzofuran, pyridine, pyrimidine, triazine, benzothiazole, 9,9-dimethylfluorene, 9,9-diphenylfluorene, thiophene, furan, benzothiphene, benzofuran, dibenzothiphene, pyrene, perylene, and spirodifluorene; L1 and L2 may optionally have at least one substituent selected from combination A; the heteroatom of type A is selected from at least one of N, O, and S; the combination A is composed of C 1-12 alkyl, C 1-12 alkoxy, C 1-12 alkyl-substituted phenyl, C 1-12 Alkyl-substituted benzyl groups; R1 and R2 may be the same or different, and each is independently selected from C that is unsubstituted or substituted by at least one group in combination B. 1-24 The alkyl group, unsubstituted group, or C group substituted with at least one group from combination B 1-24 The alkoxy group, unsubstituted or substituted by at least one group in combination B, of C 3-10 cycloalkyl, unsubstituted or substituted by at least one group in combination B, C 2-16 The alkenyl group, the unsubstituted phenyl group, or the phenyl group substituted by at least one group in combination B; Combination B consists of C 1-12 alkyl, C 1-12 alkoxy, cyano, -COO-R 1 -OC(O)-R 1 -C(O)-R 1 -N(R) 2 R 3 C 3-12 cycloalkyl, -S(O)-R 1 Composed of phenyl, naphthyl, benzyl, thiophene, furanyl, benzoxazolyl, dibenzothiophene, and triazine; R 1 R 2 R 3 Each is independently selected from H, cyano, and C. 1-6 One of alkyl, benzyl, thiophenyl, and furanyl groups; Preferably, the arbitrarily existing L1 and L2 are the same.

3. The structure of the organic compound or its enantiomer according to claim 1 or 2, characterized in that, In equation (I), L1 and L2 do not exist; R1 and R2 may be the same or different, and each is independently selected from C that is unsubstituted or substituted by at least one group in combination B. 1-24 The alkyl group, unsubstituted group, or C group substituted with at least one group from combination B 1-24 The alkoxy group, unsubstituted or substituted by at least one group in combination B, of C 3-10 cycloalkyl, unsubstituted or substituted by at least one group in combination B, C 2-16 The alkenyl group, the unsubstituted phenyl group, or the phenyl group substituted by at least one group in combination B; Combination B consists of C 1-12 alkyl, C 1-12 alkoxy, cyano, -COO-R 1 -OC(O)-R 1 -C(O)-R 1 -N(R) 2 R 3 C 3-12 cycloalkyl, -S(O)-R 1 Composed of phenyl, naphthyl, benzyl, thiophene, furanyl, benzoxazolyl, dibenzothiophene, and triazine; R 1 R 2 R 3 Each is independently selected from H, cyano, and C. 1-6 One of alkyl, benzyl, thiophenyl, and furanyl groups; Preferably, the organic compound represented by formula (I) is selected from any one of the following:

4. The structure of the organic compound or its enantiomer according to claim 1 or 2, characterized in that, In equation (I), L1 and L2 are present and identical; L1 and L2 are linking groups provided by removing any two H atoms from at least one substance selected from benzene, biphenyl, naphthalene, anthracene, phenanthrene, terphenyl, dibenzofuran, pyridine, pyrimidine, triazine, benzothiazole, 9,9-dimethylfluorene, 9,9-diphenylfluorene, thiophene, furan, benzothiphene, benzofuran, dibenzothiphene, pyrene, perylene, and spirodifluorene; L1 and L2 optionally have at least one substituent selected from combination A; the heteroatom of type A is selected from at least one of N, O, and S; the combination A is composed of C 1-12 alkyl, C 1-12 alkoxy, C 1-12 alkyl-substituted phenyl, C 1-12 Alkyl-substituted benzyl groups; R1 and R2 may be the same or different, and each is independently selected from C that is unsubstituted or substituted by at least one group in combination B. 1-24 The alkyl group, unsubstituted group, or C group substituted with at least one group from combination B 1-24 The alkoxy group, unsubstituted or substituted by at least one group in combination B, of C 3-10 cycloalkyl, unsubstituted or substituted by at least one group in combination B, C 2-16 The alkenyl group, the unsubstituted phenyl group, or the phenyl group substituted by at least one group in combination B; Combination B consists of C 1-12 alkyl, C 1-12 alkoxy, cyano, -COO-R 1 -OC(O)-R 1 -C(O)-R 1 -N(R) 2 R 3 C 3-12 cycloalkyl, -S(O)-R 1 Composed of phenyl, naphthyl, benzyl, thiophene, furanyl, benzoxazolyl, dibenzothiophene, and triazine; R 1 R 2 R 3 Each is independently selected from H, cyano, and C. 1-6 One of alkyl, benzyl, thiophenyl, and furanyl groups; Preferably, the organic compound represented by formula (I) is selected from any one of the following:

5. The structure of the organic compound or its enantiomer according to claim 1 or 2, characterized in that, The organic compound represented by formula (I) is selected from any one of the following:

6. The use of the organic compound containing a triazole structure and an unsaturated double bond structure, or its enantiomer, as described in any one of claims 1-5, in a film; Preferably, the adhesive film is an encapsulating adhesive film; Preferably, the adhesive film is a light conversion encapsulation film; Preferably, the film is an ultraviolet light conversion encapsulation film.

7. A composition for an ultraviolet light conversion encapsulation film, characterized in that, The composition contains a light-converting agent, which contains an organic compound or its enantiomer containing a triazole structure and an unsaturated double bond structure as described in any one of claims 1-5. Preferably, the composition further comprises a matrix material and at least one auxiliary agent selected from photoinitiators, light stabilizers, crosslinking agents, co-crosslinking agents, antioxidants, and silane coupling agents; relative to 100 parts by weight of the matrix material, the content of the light conversion agent is 0.005-2 parts, the content of the photoinitiator is 0-2 parts by weight, the content of the light stabilizer is 0.1-1 parts by weight, the content of the crosslinking agent is 0-3 parts by weight, the content of the co-crosslinking agent is 0-2 parts by weight, the content of the antioxidant is 0.05-1 parts by weight, and the content of the silane coupling agent is 0.2-1 parts by weight. More preferably, relative to 100 parts by weight of the matrix material, the content of the photoconverter is 0.01-1 parts, the content of the photoinitiator is 0.1-2 parts by weight, the content of the light stabilizer is 0.1-1 parts by weight, the content of the crosslinking agent is 0.1-3 parts by weight, the content of the co-crosslinking agent is 0.1-2 parts by weight, the content of the antioxidant is 0.05-1 parts by weight, and the content of the silane coupling agent is 0.2-1 parts by weight; Preferably, the matrix material is an ethylene copolymer; Preferably, the matrix material is selected from at least one of ethylene-vinyl acetate copolymer, ethylene-butene copolymer, ethylene-octene copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate-based multi-component copolymer, ethylene-methyl acrylate-based multi-component copolymer, ethylene-ethyl acrylate-based multi-component copolymer, ethylene-methyl methacrylate-based multi-component copolymer, ethylene-ethyl methacrylate-based multi-component copolymer, and ethylene-α-olefin copolymer; Preferably, the matrix material is an ethylene-vinyl acetate copolymer; Preferably, the matrix material is an ethylene-vinyl acetate copolymer, and the content of vinyl acetate structural units in the ethylene-vinyl acetate copolymer is 25-35 wt%, the melt index of the ethylene-vinyl acetate copolymer is 0.1-40 g / min, the melting point is 40-90℃, and the light transmittance is ≥90%.

8. A method for preparing an ultraviolet light conversion encapsulating film, characterized in that, This method utilizes the components of the composition for ultraviolet light conversion encapsulation film as described in claim 7, including: Material I containing each component of the composition is sequentially mixed and molded to obtain the ultraviolet light conversion encapsulation film; Preferably, the mixing conditions include: a mixing temperature of 70℃-120℃; a mixing time of 10min-40min; and a stirring speed of 100rpm-300rpm.

9. The ultraviolet light conversion encapsulating film obtained by the method for preparing ultraviolet light conversion encapsulating film according to claim 8; Preferably, the thickness of the ultraviolet light conversion encapsulation film is 0.3mm-0.8mm.

10. The application of the ultraviolet light conversion encapsulating film according to claim 9 in photovoltaic devices.

11. A photovoltaic module, characterized in that, The photovoltaic module contains photovoltaic glass, encapsulating film layer I, solar cells, encapsulating film layer II, and photovoltaic backsheet, which are stacked in sequence. The materials forming the encapsulating film layer I and the encapsulating film layer II are each independently selected from at least one of the ultraviolet light conversion encapsulating films according to claim 9.

12. A method for preparing the photovoltaic module of claim 11, characterized in that, The method includes: (1) Photovoltaic glass, encapsulating film I, solar cell, encapsulating film II and photovoltaic backsheet are stacked in sequence to obtain intermediate body I; (2) The intermediate I is subjected to hot pressing to obtain the photovoltaic module; The encapsulating film I and the encapsulating film II are each independently selected from at least one of the ultraviolet light conversion encapsulating films according to claim 9; Preferably, in step (2), the conditions for the hot pressing treatment include: heating temperature of 80-170℃, pressing pressure of 40KPa-70KPa, and pressing time of 15-30min.

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