KR101816968B1 - Optical sheet - Google Patents
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- KR101816968B1 KR101816968B1 KR1020140191741A KR20140191741A KR101816968B1 KR 101816968 B1 KR101816968 B1 KR 101816968B1 KR 1020140191741 A KR1020140191741 A KR 1020140191741A KR 20140191741 A KR20140191741 A KR 20140191741A KR 101816968 B1 KR101816968 B1 KR 101816968B1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The present invention relates to an optical sheet and a photovoltaic module including the optical sheet. The optical sheet according to the present application has high light transmittance and can exhibit high light transmittance and excellent ultraviolet ray shielding ability, , It is possible to stably maintain an excellent adhesive force with the encapsulant, which can be usefully applied to a photovoltaic module.
Description
The present application relates to an optical sheet and a photovoltaic module including the same.
There is a growing interest in renewable energy and clean energy due to global environmental problems and depletion of fossil fuels. Among them, photovoltaic energy is attracting attention as a representative pollution-free energy source that can solve environmental pollution problem and fossil fuel depletion problem have.
Photovoltaic (PV) solar photovoltaic (PV) technology is a device that converts sunlight into electric energy. Since it is required to be exposed to the external environment for a long time in order to easily absorb sunlight, various packaging for protecting the cell is performed, ), And these units are referred to as photovoltaic modules.
In general, the photovoltaic module uses an optical sheet having excellent weather resistance so as to stably protect the photovoltaic cell even when exposed to the external environment for a long period of time. In order to improve the weatherability, it is necessary to lower the ultraviolet transmittance into the photovoltaic module. For this purpose, it is common to use an ultraviolet absorber.
In addition, it is necessary to secure an excellent durability by improving the adhesion with the encapsulant used in the photovoltaic module.
Patent Documents 1 to 3 propose a technique for satisfying the physical properties required for the back sheet among the optical sheets.
The present application provides an optical sheet and a photovoltaic module including the same.
The present application relates to an optical sheet.
The exemplary optical sheet may be an optical sheet for a photovoltaic module applicable to a photovoltaic module. More specifically, the optical sheet may be an optical sheet applicable as a front substrate or a back sheet included in the photovoltaic module, and more preferably, it may be an optical sheet applicable as a back sheet. In this specification, the above-mentioned "optical sheet for a photovoltaic module" may be referred to as an "optical sheet".
In one example, the optical sheet of the present application comprises a base layer; And a surface layer formed on at least one surface of the substrate layer.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram schematically showing a cross section of an optical sheet according to the present application. FIG. The
The substrate layer is not particularly limited, and various materials known in the art can be used, and can be appropriately selected depending on the required functions and applications.
As the base layer, a single sheet such as an acrylic film, a polyether film, a polyester film, a polyolefin film, a polyamide film, a polyurethane film, a polycarbonate film and a polyimide film, A laminated sheet of polymer films, or a pneumatic article, and a polyester film can be usually used, but the present invention is not limited thereto. Examples of the polyester film include at least one selected from the group consisting of a polyethylene terephthalate (PET) film, a polyethylene naphthalate (PEN) film, and a polycarbonate (PC) film , But is not limited thereto.
The thickness of the base layer is not particularly limited, but may be, for example, in the range of 25 탆 to 300 탆, 100 탆 to 280 탆, or 150 탆 to 250 탆. By adjusting the thickness of the base layer within the above-mentioned range, the mechanical properties and handleability of the optical sheet can be improved. However, the thickness of the base layer according to the embodiments of the present application is not limited to the above-mentioned range, and it can be suitably adjusted as required.
In order to improve the adhesion with the surface layer described above, the base layer is subjected to spark discharge treatment at a high frequency such as corona treatment or plasma treatment on one side or both sides thereof; Heat treatment; Flame treatment; Anchor treatment; Coupling agent treatment; Primer treatment or a gas phase Lewis acid (ex. BF 3), can be done by a surface treatment such as a chemical activation treatment with sulfuric acid or hot sodium hydroxide. The surface treatment method may be carried out by any well-known means generally used in this field.
In addition, from the viewpoint of improving the physical properties such as moisture barrier properties, the substrate layer may be formed with an inorganic oxide deposited layer on one side or both sides, if necessary. The kind of the inorganic oxide is not particularly limited, and any inorganic oxide may be employed as long as it has moisture barrier properties. For example, silicon oxide or aluminum oxide can be used. The method of forming the inorganic oxide vapor deposition layer on one side or both sides of the substrate layer is not particularly limited and may be a vapor deposition method generally used in this field. When the inorganic oxide deposit layer is formed on one surface or both surfaces of the substrate layer, the above-described surface treatment may be performed on the deposition layer after the inorganic oxide deposit layer is formed on the surface of the substrate layer.
In one example, the surface layer comprises a polyfunctional (meth) acrylate based ultraviolet curable monomer or oligomer; And ultraviolet absorber may be cured to form the composition. As used herein, the term " (meth) acrylate " may be understood to include acrylate and methacrylate.
The polyfunctional (meth) acrylate-based ultraviolet ray-curable monomer or oligomer is not particularly limited as long as it is contained in the composition and can be cured to have transparency for application to the optical sheet, Trimethylolpropane triacrylate, glycerin propoxylated triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, pentaerythritol pentaacrylate, pentaerythritol pentaacrylate, pentaerythritol pentaacrylate, pentaerythritol triacrylate, Dipentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, urethane acrylate, ester acrylate, epoxy acrylate, and ether acrylate, and ethylene oxide (EO) thereof, ) Denaturation And a compound having a large number of functional groups per molecular weight such as pentaerythritol triacrylate or dipentaerythritol tetraacrylate is preferable from the viewpoint of improving the surface hardness of the optical sheet Do.
Since the optical sheet of the present application includes the polyfunctional (meth) acrylate-based ultraviolet ray-curable monomer or oligomer, it is possible not only to secure physical properties such as transparency of the optical sheet, but also to improve the adhesive strength to the encapsulant for a photovoltaic module Can also be improved.
In one example, the ultraviolet absorber may be a compound represented by the following formula (1).
[Chemical Formula 1]
In Formula 1,
R 1 is hydrogen, halogen, an alkoxy group having 1 to 6 carbon atoms, or an aryl group;
R 2 is hydrogen, an alkyl group having 1 to 6 carbon atoms, or an aryl group;
R 3 represents R 4 -R 5 -R 6 ,
R 4 represents a single bond or oxygen,
R 5 represents a single bond or represents - (CH 2 ) m O-, -CH (CH 3 ) CH 2 O-, -CH 2 CH (CH 3 ) O-, - (CH 2 ) m OCH 2 - CH (CH 3) CH 2 OCH 2 - and -CH 2 CH (CH 3) OCH 2 - represents one selected from the group consisting of,
R 6 represents an acryloyl group, a methacryloyl group, a styrene group or a vinyl group,
n and m each independently represent an integer of 1 to 4;
In the above formula (1), preferably
R < 1 > is hydrogen;
R 2 is hydrogen or an alkyl group having 1 to 6 carbon atoms;
R 3 represents R 4 -R 5 -R 6 ,
R 4 represents a single bond,
R 5 represents - (CH 2 ) m O-,
R 6 represents an acryloyl group or a methacryloyl group,
and m represents an integer of 1 to 3.
In one example, the ultraviolet absorber is not particularly limited as long as it has ultraviolet absorbing ability, but for example, 2- (2'-hydroxy-5'-methacryloxyethylphenyl) -2H-benzotriazole or 2- Hydroxy-4 (2,3-epoxy-propoxy) benzophenone.
In one example, the ultraviolet absorber is used in an amount of 1 part by weight to 20 parts by weight, 2 parts by weight to 15 parts by weight or 5 parts by weight to 12 parts by weight relative to 100 parts by weight of the polyfunctional (meth) acrylate based ultraviolet curable monomer or oligomer ≪ / RTI > In the present specification, the unit " part by weight " may mean the ratio of the weight between the respective components. The content of the ultraviolet absorber can be appropriately controlled within the range described above to improve the weatherability when applied to a photovoltaic module through ultraviolet shielding ability while maintaining high light transmittance and also to provide an optical sheet having excellent adhesiveness to an encapsulant .
The ultraviolet absorber may be used in the form of a single compound, and if necessary, may be used in a polymerized form with a (meth) acrylate monomer.
The kind of the (meth) acrylate monomer is not particularly limited. In the present application, for example, alkyl (meth) acrylate can be used, and specifically, an alkyl (meth) acrylate having an alkyl group having 1 to 14 carbon atoms, preferably 1 to 8 carbon atoms in terms of controlling the adhesive force of the surface layer ) Acrylate may be used. Examples of such monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, (Meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-ethylbutyl (meth) acrylate, n-octyl , Isooctyl (meth) acrylate or isononyl (meth) acrylate. Of these, one kind or a mixture of two or more kinds can be used.
When the ultraviolet absorber is used in the form of being polymerized with the (meth) acrylate monomer, for example, 70 to 99.9 parts by weight of the (meth) acrylate monomer and 0.1 to 30 parts by weight of the ultraviolet absorber Lt; RTI ID = 0.0 > polymer. ≪ / RTI > In another example, the ultraviolet absorber may be a mixture of 80 to 90 parts by weight of a (meth) acrylate monomer and 10 to 20 parts by weight of an ultraviolet absorber. By using the ultraviolet absorber in the form of being polymerized with the (meth) acrylate monomer described above and adjusting the content of the ultraviolet absorber, it is possible not only to secure the adhesion between the base layer and the surface layer or between the surface layer and the encapsulating material, The excellent UV blocking ability can ensure the weathering resistance and other properties when the photovoltaic module is applied.
The method of polymerizing the composition is not particularly limited, and may be carried out by mixing the above-mentioned monomers in an appropriate ratio and subjecting them to solution polymerization, photo polymerization, bulk polymerization, suspension polymerization, Or by emulsion polymerization. [0033] The term " polymer " If necessary in this process, suitable polymerization initiators or molecular weight regulators, chain transfer agents and the like may be used together.
The surface layer may be a composition comprising the above-mentioned polyfunctional (meth) acrylate-based ultraviolet-curing monomer or oligomer; And ultraviolet absorbers, as well as a multifunctional crosslinking agent capable of crosslinking the polymer of the composition. In the present specification, the "multifunctional crosslinking agent" may be referred to as "crosslinking agent".
The crosslinking agent may include at least two or more, two to ten, two to eight, two to six, or two to four functional groups capable of reacting with the crosslinkable functional group contained in the polymer of the composition Crosslinking agent may be used. Examples of the crosslinking agent include triallyl isocyanurate, triallyl cyanurate, tris (2-hydroxyethyl) isocyanurate, xylene diisocyanate, tris (2,3-epoxypropyl) isocyanurate, And at least one member selected from the group consisting of cyclic isocyanurates.
The optical sheet of the present application can control the composition contained in the surface layer so as to include the above-mentioned crosslinking agent, so that the adhesion between the surface layer of the optical sheet and the sealing material used in the photovoltaic module can be secured to a satisfactory level. As used herein, the term " encapsulant " includes commonly used ethylene-vinyl acetate copolymer (EVA), and may include all encapsulants applicable to photovoltaic modules. Further, the encapsulating material may be a form including both a sheet form and a film form.
If necessary, the crosslinking agent may further comprise a compound used as a conventional crosslinking agent such as an isocyanate compound, an epoxy compound, an aziridine compound, or a metal chelate compound. Such a compound may be selected from the group of crosslinkable functional groups An appropriate kind may be selected and used.
Examples of the isocyanate compound include diisocyanate compounds such as tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isoboron diisocyanate, tetramethylxylene diisocyanate and naphthalene diisocyanate, and diisocyanate compounds such as diisocyanate compounds And a reaction product of a polyol such as trimethylolpropane or an isocyanurate adduct of the above diisocyanate compound. Of these, xylene diisocyanate or hexamethylene diisocyanate can be preferably used, and the epoxy compound Include, for example, ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane triglycidyl ether, N, N, N ', N'-tetraglycidylethylenediamine and glycerin diglycidyl ether At least one selected from the group consisting of
Examples of the aziridine compound include N, N'-toluene-2,4-bis (1-aziridine carboxamide), N, N'-diphenylmethane-4,4'- (2-methyl aziridine) or tri-1-aziridinyl phosphine oxide, and the like, but not limited thereto, and the metal chelate Examples of the compound include compounds in which a polyvalent metal such as aluminum, iron, zinc, tin, titanium, antimony, magnesium and / or vanadium is coordinated to acetylacetone or ethyl acetoacetate, and the like.
The crosslinking agent may be used in an amount of, for example, 0.1 to 200 parts by weight, 1 to 150 parts by weight, 5 to 135 parts by weight, or 100 parts by weight, based on 100 parts by weight of the polyfunctional (meth) acrylate based ultraviolet- 10 parts by weight to 120 parts by weight. The cross-linking agent can be adjusted to be included in the surface layer within the above-mentioned range, and the physical properties such as the adhesion to the encapsulating material of the surface layer can be secured.
The surface layer may further contain at least one additive selected from the group consisting of coupling agents, tackifiers, antioxidants, colorants, reinforcing agents, fillers, defoamers, surfactants and plasticizers, if necessary, in addition to the base layer or the sealing material As shown in FIG.
The composition contained in the optical sheet of the present application may further contain a fluororesin in addition to the above-mentioned components from the viewpoint of enhancing weatherability.
As the fluororesin, various resins containing fluorine atoms known in the art can be used. Examples of the fluororesin include vinylidene fluoride (VF), vinyl fluoride (VF), tetrafluoroethylene (TFE), hexafluoropropylene (HFP), and the like. Perfluoroethyl vinyl ether (PMVE, perfluoro (methylvinylether)), perfluoroethyl vinyl ether (PMVE), perfluoroethyl vinyl ether Perfluoro (ethyl vinyl ether), perfluoropropyl vinyl ether (PPVE), perfluorohexyl vinyl ether (PHVE), perfluoro-2,2-dimethyl-1,3-dioxole (PDD) Copolymers or mixtures thereof comprising at least one monomer selected from the group consisting of methylene-4-methyl-4-methyl-1,3-dioxolane (PMD) in polymerized form, Quot; The fluororesin is a homopolymer or copolymer comprising vinylidene fluoride (VDF) in polymerized form; Or a mixture comprising the same.
The type of the comonomer that can be contained in the form of the polymer in the copolymer is not particularly limited and includes, for example, tetrafluoroethylene (TFE), hexafluoropropylene (HFP), chlorotrifluoro But are not limited to, ethylene (CTFE), trifluoroethylene, hexafluoroisobutylene, perfluorobutyl ethylene, perfluoro (methylvinylether), and perfluoroethyl vinyl ether perfluorohexyl vinyl ether (PHVE), perfluoro-2,2-dimethyl-1,3-dioxole (PDD), and perfluoro-2 Methylene-4-methyl-1,3-dioxolane (PMD), and the like, and examples thereof include at least one of hexafluoropropylene and chlorotrifluoroethylene. However, But is not limited thereto.
In one example, the fluororesin may be a mixture of a homopolymer comprising vinylidene fluoride in polymerized form and a copolymer of vinylidene fluoride and hexafluoropropylene, or a mixture of vinylidene fluoride and chlorotrifluoro , A copolymer of ethylene and a copolymer of vinylidene fluoride and hexafluoropropylene.
The content of the comonomer contained in the copolymer is not particularly limited and may be, for example, about 0.5 to 50 wt%, 1 to 40 wt%, and 7 wt% based on the total weight of the copolymer % To 40 wt%, 10 wt% to 30 wt%, or 10 wt% to 20 wt%. By controlling the content of the comonomer in the above-described range, it is possible to further improve the adhesive force while ensuring the durability and weather resistance of the optical sheet.
The weight average molecular weight of the fluororesin may be from 50,000 to 100, and may be from 100,000 to 700,000, or from 300,000 to 50,000, but is not limited thereto. As used herein, the term " weight average molecular weight " is a conversion value of standard polystyrene measured by GPC (Gel Permeation Chromatograph). In embodiments of the present application, excellent workability and other physical properties can be secured by controlling the weight average molecular weight of the fluororesin within the above range.
The composition may further comprise a photoinitiator.
Examples of the photoinitiator include a photoinitiator such as a benzoin-based initiator, a hydroxyketone-based initiator, an amino ketone-based initiator, or a phosphine oxide-based initiator, which is capable of generating radicals by light irradiation, Initiators may be used without limitation.
More specifically, examples of the photoinitiator include? -Hydroxyketone compounds (e.g., IRGACURE 184, IRGACURE 500, IRGACURE 2959, DAROCUR 1173, Ciba Specialty Chemicals); Phenylglyoxylate-based compounds (ex IRGACURE 754, DAROCUR MBF; Ciba Specialty Chemicals); Benzyldimethylketal compounds (ex IRGACURE 651; Ciba Specialty Chemicals); α-aminoketone-based compounds (ex IRGACURE 369, IRGACURE 907, IRGACURE 1300, Ciba Specialty Chemicals); Monoacylphosphine based compounds (MAPO) (ex. DAROCUR TPO; Ciba Specialty Chemicals); Bisacylphosphine compounds (BAPO) (ex IRGACURE 819, IRGACURE 819DW; Ciba Specialty Chemicals); Phosphine oxide-based compounds (ex IRGACURE 2100; Ciba Specialty Chemicals); Metallocene compounds (ex IRGACURE 784; Ciba Specialty Chemicals); Iodonium salt (ex.IRGACURE 250 from Ciba Specialty Chemicals); And mixtures of at least one of the foregoing, and the like, but are not limited thereto.
The photoinitiator may be included in an amount of 1 part by weight to 10 parts by weight, 2 parts by weight to 8 parts by weight or 4 parts by weight to 6 parts by weight based on 100 parts by weight of the polyfunctional (meth) acrylate based ultraviolet curable monomer or oligomer. When the content of the photoinitiator is too small, the effect due to the addition may be insignificant. When the content is too large, the physical properties such as durability and transparency may be adversely affected.
The composition may further include a pigment and / or a filler for improving the power generation efficiency of the solar cell and improving the physical properties of the optical sheet for a photovoltaic module. Examples of the pigment and / or filler include titanium dioxide, silica, Alumina, calcium carbonate, barium sulfate, carbon black, and metal oxide, and pigments for imparting black pigments and other colors such as carbon black can also be used.
The thickness of the surface layer may be in the range of 1 탆 to 30 탆, 2 탆 to 20 탆, or 3 탆 to 10 탆. By adjusting the thickness of the surface layer within the above-mentioned range, light transmittance and ultraviolet shielding ability can be enhanced and manufacturing cost can be reduced.
In one example, the optical sheet of the present application is an optical sheet for a photovoltaic module satisfying the following formulas 1 and 2:
[Equation 1]
X > = 70 N / cm
[Equation 2]
Y? 40 N / cm
In the above Formulas 1 and 2, X represents the initial adhesive force of the optical sheet measured under the conditions of a peel angle of 180 degrees and a peel rate of 1000 mm / min after bonding the optical sheet surface layer and the ethylene-vinyl acetate copolymer (EVA) sheet, Y was bonded to an optical sheet surface layer and an ethylene-vinyl acetate copolymer (EVA) sheet, and then exposed for 25 hours under the conditions of 121 ° C and 100% relative humidity. Then, the film was peeled under conditions of a peel angle of 180 ° and a peel rate of 1000 mm / Of the optical sheet.
The optical sheet of the present application satisfies the above expressions (1) and (2), so that it has an excellent adhesive force with the sealing material and can stably maintain the excellent adhesive force, so that it can be effectively applied to a photovoltaic module.
The optical sheet of the present application may further include various functional layers known in the industry as needed in addition to the above-described layers.
Examples of the functional layer include an adhesive layer or an insulating layer. The adhesive layer and the insulating layer may be sequentially formed on the other surface of the substrate layer when the reflective layer is formed on one surface of the substrate layer.
The method for producing the optical sheet of the present application is not particularly limited, and examples thereof include the above-mentioned multifunctional (meth) acrylate-based ultraviolet-curing monomer or oligomer; And a surface layer formed by curing a composition containing an ultraviolet absorber may be coated on one side or both sides of the above-mentioned base layer.
The coating method may be carried out by a conventional coating method, for example, the above-mentioned polyfunctional (meth) acrylate-based UV-curable monomer or oligomer; And a UV absorber may be applied to a suitable process substrate by a conventional means such as a bar coater and then cured.
The method of curing the coating liquid is not particularly limited and may be, for example, curing through appropriate heating, drying and / or aging. Preferably, curing by irradiation with electromagnetic waves such as ultraviolet (UV) Method can be employed.
The present application also relates to photovoltaic modules.
In one example, the photovoltaic module comprises a front substrate; A back sheet, and two or more photovoltaic cells disposed between the front substrate and the back sheet and spaced apart from each other.
In the photovoltaic module of the present application, the front substrate or the back sheet may be the optical sheet described above.
The specific types of the front substrate and the photovoltaic cell that can be used in the above are not particularly limited. For example, the front substrate may be a conventional plate glass; Or a transparent composite sheet obtained by laminating a glass, a fluororesin sheet, a weather-resistant film and a barrier film. The photovoltaic cell may be, for example, an active layer of the silicon wafer type or a thin film active layer formed by chemical vapor deposition . In addition, the photovoltaic cell may be an n-type cell or a p-type cell, and may be an n-type cell, but is not limited thereto.
The optical sheet according to the present application has a high light transmittance and can exhibit a high light transmittance and is excellent in ultraviolet shielding ability to ensure excellent weatherability when a photovoltaic module is applied and stably maintain excellent adhesion with an encapsulant, As shown in FIG.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram schematically showing a cross section of an optical sheet according to the present application. FIG.
Hereinafter, the present application will be described in more detail by way of examples according to the present application and comparative examples not complying with the present application, but the scope of the present application is not limited by the following examples.
Hereinafter, physical properties in Examples and Comparative Examples were evaluated in the following manner.
One. Hayes Measure
The haze of the optical sheet (thickness: 100 mu m) produced in Examples and Comparative Examples was measured according to JIS K 7105-1 standard using a haze meter (COH-400, Nippon Denshoku) and is shown in Table 1 .
2. Encapsulation Initial Adhesion (X) Evaluation
The optical sheets prepared in Examples and Comparative Examples were made into specimens cut into a size of 10 cm × 20 cm in length and then laminated on a glass plate (thickness: about 5 mm), a sealing material (thickness: about 450 μm) (UTM), Zwick / Roell GmbH (Zwick / Roell GmbH) immediately after preparing a sample cut with a width of 1 cm x width 1 cm and then pressing it in a vacuum laminator at a temperature of 150 ° C for 13 minutes (X) was measured under the conditions of a peeling angle of 180 degrees and a peeling speed of 1000 mm / min using the following criteria.
<Evaluation Criteria>
A: When X is 70N / cm or more
B: When X is less than 70 N / cm
3. PCT test after Encapsulation Adhesion (Y) evaluation
The initial adhesion (X) was measured by using a PCT apparatus and maintained at 121 캜, 2 atmospheric pressure and 100% relative humidity for 25 hours (PCT test), followed by a universal testing machine (UTM) / Roell GmbH), the adhesive force (Y) was measured under the conditions of a peeling angle of 180 deg. And a peeling rate of 1000 mm / min.
<Evaluation Criteria>
A: When Y is more than 40 N / cm
B: When Y is less than 40 N / cm
4. Ultraviolet transmittance measurement
Using the metal halide ultraviolet lamp, the optical sheets prepared in Examples and Comparative Examples were formed into specimens of 7 cm in width and 7 cm in width at the bottom of the ultraviolet lamp, the specimens were fixed, the ultraviolet intensity meter was placed at the bottom of the specimen , And ultraviolet ray intensity was measured. Ultraviolet ray transmittance was measured using the change in ultraviolet intensity by the optical sheet, and the results are shown in Table 2.
≪ Preparation of composition >
Manufacturing example 1. Preparation of Composition (A1)
30 g of methyl ethyl ketone (MEK), 30 g of butyl acetate (BA), 30 g of propylene glycol monomethyl ether acetate (PGMEA) and 90 g of pentaerythritol triacrylate (PETA) were uniformly mixed and then mixed with Irgacure 184 Ciba Geigy) and Darocur-1173 (manufactured by Ciba Specialty Chemicals) were added and mixed to prepare a mixture. Thereafter, 150 g of toluene, 10 g of reactive UVA additive RUVA-93 (manufactured by Otsuka Chemical Co., Ltd.), 90 g of methyl methacrylate (MMA) and 90 g of initiator V- -azobis (2,4-dimethyl valeronitrile)) was added to 20 g of the polymerized resin to prepare a composition (A1).
Manufacturing example 2 to Manufacturing example 13. Preparation of the compositions (A2 to F)
The raw materials and additives used in the preparation of the composition (A1) (except for methyl ethyl ketone (MEK), butyl acetate (BA), propylene glycol monomethyl ether acetate (PGMEA) and toluene) (A2 to F) were prepared in the same manner as in Preparation Example 1, except that the kinds of the components (A2 to F) were adjusted as shown in Table 1 below.
castle
water
PETA: pentaerythritol triacrylate
TMPTA: trimethylolpropane triacrylate
RUVA-MMA: Polymer obtained by polymerizing 2- (2-hydroxy-5'-methacryloxyethylphenyl) -2H-benzotriazole, methyl (meth) acrylate and V-65 at a ratio of 10:
TAIC: triallyl isocyanurate
PE110: Miramer PE110 (manufactured by Miwon specialty chemical Co., Ltd.)
DMAA: N, N-dimethylacrylamide
KAR: Karenz MT PE1 (produced by Showa Denko Co., Ltd.)
MPTMS: methacryloxypropyltrimethoxysilane
I184: (manufactured by Ciba Geigy)
D1173: (manufactured by Ciba Specialty Chemicals)
< Optical sheet And photovoltaic module &
Example One
The obtained composition (A1) was coated on both sides of a PET (poly (ethylene terephthalate)) film (thickness: 100 탆) and dried to form a surface layer, and then an optical sheet was prepared.
Further, a plate glass (thickness: about 5 mm), a sealing material having a thickness of 450 탆, a crystal silicon wafer photovoltaic cell, a sealant having a thickness of 160 탆 and an optical sheet prepared above were laminated in this order. Min to produce a photovoltaic module.
Example 2
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (A2) prepared in Preparation Example 2 was used in place of the composition (A1) used in Example 1.
Example 3
An optical sheet and a photovoltaic module were produced in the same manner as in Example 1, except that the composition (A3) prepared in Preparation Example 3 was used in place of the composition (A1) used in Example 1.
Example 4
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (A4) prepared in Preparation Example 4 was used in place of the composition (A1) used in Example 1.
Example 5
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (A5) prepared in Preparation Example 5 was used in place of the composition (A1) used in Example 1.
Comparative Example One
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (B1) prepared in Preparation Example 6 was used in place of the composition (A1) used in Example 1.
Comparative Example 2
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (B2) prepared in Preparation Example 7 was used in place of the composition (A1) used in Example 1.
Comparative Example 3
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (B3) prepared in Preparation Example 8 was used in place of the composition (A1) used in Example 1.
Comparative Example 4
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (B4) prepared in Production Example 9 was used in place of the composition (A1) used in Example 1.
Comparative Example 5
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (C) prepared in Preparation Example 10 was used in place of the composition (A1) used in Example 1.
Comparative Example 6
An optical sheet and a photovoltaic module were produced in the same manner as in Example 1, except that the composition (D) prepared in Preparation Example 11 was used in place of the composition (A1) used in Example 1.
Comparative Example 7
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (E) prepared in Preparation Example 12 was used in place of the composition (A1) used in Example 1.
Comparative Example 8
An optical sheet and a photovoltaic module were prepared in the same manner as in Example 1, except that the composition (F) prepared in Preparation Example 13 was used in place of the composition (A1) used in Example 1.
The results of physical properties measured for the above Examples and Comparative Examples are shown in Table 2 below.
0
9
2
Transmittance
17
31
15
As shown in Table 2, the optical sheets (Examples 1 to 5) of the present application are optical sheets (Comparative Examples 5 to 8) containing no multifunctional crosslinking agent or optical sheets containing different kinds of crosslinking agents 1 to 4), it is superior in terms of haze and ultraviolet transmittance, in particular, has an excellent initial adhesion with an encapsulant, can stably maintain the adhesive force even under severe conditions, and can be usefully used for a photovoltaic module Respectively.
110: Optical sheet
111: substrate layer
112: Surface layer
Claims (15)
And a surface layer formed on at least one surface of the substrate layer,
The surface layer may comprise a polyfunctional (meth) acrylate based ultraviolet curable monomer or oligomer; Ultraviolet absorber; And a polyfunctional cross-linking agent are cured to form a composition,
Wherein the ultraviolet absorber is an optical sheet for a photovoltaic module having a reactor capable of copolymerizing with the polyfunctional (meth) acrylate-based ultraviolet-curing monomer or oligomer,
Wherein the optical sheet is an optical sheet for a photovoltaic module satisfying the following expressions (1) and (2):
[Equation 1]
X > = 70 N / cm
[Equation 2]
Y? 40 N / cm
In the above Formulas 1 and 2, X represents the initial adhesive force of the optical sheet measured under the conditions of a peel angle of 180 degrees and a peel rate of 1000 mm / min after bonding the optical sheet surface layer and the ethylene-vinyl acetate copolymer (EVA) sheet, Y was bonded to an optical sheet surface layer and an ethylene-vinyl acetate copolymer (EVA) sheet, and then exposed for 25 hours under the conditions of 121 ° C and 100% relative humidity. Then, the film was peeled under conditions of a peel angle of 180 ° and a peel rate of 1000 mm / Of the optical sheet.
[Chemical Formula 1]
In Formula 1,
R 1 is hydrogen, halogen, an alkoxy group having 1 to 6 carbon atoms, or an aryl group;
R 2 is hydrogen, an alkyl group having 1 to 6 carbon atoms, or an aryl group;
R 3 represents R 4 -R 5 -R 6 ,
R 4 represents a single bond or oxygen,
R 5 represents a single bond or represents - (CH 2 ) m O-, -CH (CH 3 ) CH 2 O-, -CH 2 CH (CH 3 ) O-, - (CH 2 ) m OCH 2 - CH (CH 3) CH 2 OCH 2 - and -CH 2 CH (CH 3) OCH 2 - represents one selected from the group consisting of,
R 6 represents an acryloyl group, a methacryloyl group, a styrene group or a vinyl group,
n and m each independently represent an integer of 1 to 4;
R < 1 > is hydrogen; R 2 is hydrogen or an alkyl group having 1 to 6 carbon atoms;
R 3 represents R 4 -R 5 -R 6 , R 4 represents a single bond, R 5 represents - (CH 2 ) m O-, R 6 represents an acryloyl group or a methacryloyl group,
and m represents an integer of 1 to 3.
Wherein the front substrate or the back sheet is an optical sheet for a photovoltaic module according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140191741A KR101816968B1 (en) | 2014-12-29 | 2014-12-29 | Optical sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020140191741A KR101816968B1 (en) | 2014-12-29 | 2014-12-29 | Optical sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20160080187A KR20160080187A (en) | 2016-07-07 |
| KR101816968B1 true KR101816968B1 (en) | 2018-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020140191741A KR101816968B1 (en) | 2014-12-29 | 2014-12-29 | Optical sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003168814A (en) * | 2001-09-18 | 2003-06-13 | Dainippon Printing Co Ltd | Rear face protection sheet for solar battery module and solar battery module using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20130038882A (en) | 2010-06-25 | 2013-04-18 | 바스프 에스이 | Coating material composition for solar cell backsheet, and solar cell backsheet |
| KR20130077048A (en) | 2011-12-29 | 2013-07-09 | 한국단자공업 주식회사 | Power distribution unit |
| WO2013108816A1 (en) | 2012-01-17 | 2013-07-25 | 電気化学工業株式会社 | Multilayer sheet, back sheet for solar cells and solar cell module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003168814A (en) * | 2001-09-18 | 2003-06-13 | Dainippon Printing Co Ltd | Rear face protection sheet for solar battery module and solar battery module using the same |
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| KR20160080187A (en) | 2016-07-07 |
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