KR20110035246A - The composition of ethylene-vinyl acetate copolymer for sealing a solar cell and the adhesive film for sealing a soloar cell and the module of a solar cell - Google Patents
The composition of ethylene-vinyl acetate copolymer for sealing a solar cell and the adhesive film for sealing a soloar cell and the module of a solar cell Download PDFInfo
- Publication number
- KR20110035246A KR20110035246A KR20090092876A KR20090092876A KR20110035246A KR 20110035246 A KR20110035246 A KR 20110035246A KR 20090092876 A KR20090092876 A KR 20090092876A KR 20090092876 A KR20090092876 A KR 20090092876A KR 20110035246 A KR20110035246 A KR 20110035246A
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- solar cell
- ethylene
- vinylacetate copolymer
- copolymer composition
- adhesive film
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
- B32B17/10788—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
- B32B17/10018—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising only one glass sheet
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- Photovoltaic Devices (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
The present invention relates to an ethylene-vinylacetate copolymer composition for solar cell encapsulation, an adhesive film for solar cell encapsulation, and a solar cell module.
Photovoltaic power generation converts solar energy directly into electrical energy using a solar cell such as a silicon semiconductor cell, and at this time, since the solar cell is in contact with air, its function is degraded. In the solar cell module, the solar cell is encapsulated using an encapsulant or a solar cell adhesive film (Solar EVA) as described above, thereby preventing foreign matters from incorporating foreign matter or moisture, while preventing a shock to external impact.
The adhesive film for encapsulating a solar cell generally uses an ethylene-vinylacetate copolymer, and requires properties such as transparency, flexibility, durability, and adhesion.
Japanese Laid-Open Patent Publication No. 2006-36875 introduces an ethylene copolymer composition containing 0.03 to 0.3 parts by weight of a silane coupling agent based on 100 parts by weight of an ethylene-vinylacetate copolymer, but a solar cell encapsulated by the ethylene copolymer composition is disclosed. The adhesive film for solvents may have a problem that the upper and lower plates of the solar cell are separated or the power generation efficiency is low when the solar cell contains a small amount of the silane coupling agent, and thus the adhesion force and the adhesive force change rate are low.
The present invention has excellent initial adhesive force, low adhesive force change rate, the upper and lower plates of the solar cell is separated during long-term use of the solar cell, solar cell encapsulation adhesive film that can prevent the reduction of power generation efficiency, ethylene for solar cell encapsulation for manufacturing the same It is to provide a solar cell module comprising a vinyl acetate copolymer composition and an adhesive film for solar cell encapsulation.
The ethylene-vinylacetate copolymer composition for solar cell encapsulation according to one embodiment of the present invention is a silane coupling agent 0.6 to 1.0 part by weight and a crosslinking agent based on 100 parts by weight of ethylene-vinylacetate copolymer and ethylene-vinylacetate copolymer. 0.1 to 5 parts by weight. Here, the ethylene-vinylacetate (Ethylene-Vinyl acetate) copolymer is preferably a vinyl acetate content of 20 to 35% by weight.
Moreover, it is preferable that the said crosslinking agent is an organic peroxide whose half life in 140 degreeC is 30 minutes or less.
In addition, the ethylene-vinylacetate copolymer composition for encapsulating a solar cell according to one embodiment of the present invention preferably further includes a compound having two or more allyl groups as a crosslinking aid, and particularly, the crosslinking aid is triallyl. More preferably, it is sociaurate or diallyl phthalate.
Solar cell encapsulation adhesive film according to a second embodiment of the present invention is prepared from the ethylene-vinylacetate copolymer composition for solar cell encapsulation according to an embodiment of the present invention described above, the initial adhesive strength is 25N / cm or more, The adhesive force change rate is characterized by being 65% or less.
Here, the initial adhesive force and the adhesive force change rate are measured as follows.
First, glass, film, and PET are prepared in 2 cm x 10 cm size. Two specimens were prepared by pressing glass / adhesive film / PET at a pressure of 100 Pa for 20 minutes at 150 ° C. using a laminator. The adhesion area of glass / adhesive film / PET is 2cm × 4cm.
(a) Initial Adhesion: One of the prepared specimens is subjected to 180 degree peel evaluation using Universal Testing Machine (UTM). First, the PET film is separated from the adhesive film, and the glass and the adhesive film are fixed to the UTM. At this time, the force required to separate the adhesive film and glass is the initial adhesive force (B1).
(b) Adhesion rate change rate: One of the prepared specimens was left at 85 ° C and 85% relative humidity for 1,000 hours, followed by 180 ° peel evaluation using a universal testing machine (UTM). . First, the PET film is separated from the adhesive film, and the glass and the adhesive film are fixed to the UTM. At this time, the force required to separate the adhesive film and the glass is the adhesive force (B2), and the adhesive force change rate is calculated by the following formula (1).
Equation 1
% Change in adhesive force = [(B1-B2) / B1] × 100
The solar cell module according to the third embodiment of the present invention is characterized by including the adhesive film for encapsulating the solar cell according to the second embodiment of the present invention described above.
The present invention has excellent initial adhesive strength, low adhesion rate, the upper and lower plates of the solar cell is separated during long-term use of the solar cell, solar cell encapsulation adhesive film that can prevent the reduction of power generation efficiency, solar cell encapsulation for producing the same Provided was a solar cell module comprising a vinyl acetate copolymer composition and an adhesive film for encapsulating a solar cell.
EMBODIMENT OF THE INVENTION Hereinafter, specific embodiment of this invention is described in detail.
The ethylene-vinylacetate copolymer composition for solar cell encapsulation according to one embodiment of the present invention comprises 0.6 parts by weight or more of a silane coupling agent based on 100 parts by weight of ethylene-vinylacetate copolymer and ethylene-vinylacetate copolymer. In addition, the adhesive force of the solar cell encapsulation adhesive film manufactured thereby may be improved to 25 N / cm or more, and the adhesive force change rate may be 65% or less. In other words, when the content of the silane coupling agent is less than 0.6 parts by weight, the adhesive force of the solar cell encapsulation adhesive film manufactured thereby cannot be improved to 25 N / cm or more. In addition, the more the amount of the silane coupling agent in the range of 0.6 parts by weight or more, the better the initial adhesive strength of the adhesive film, the lower the adhesive force change rate, and in view of economics, etc. More preferred.
The silane coupling agent hydrolyzes the alkoxysilyl group (Si-OR) with water or the like to form Silanol, and the silanol group and the glass surface form a Si-O-G bond by a condensation reaction. Since the other reactor is combined with the ethylene-vinylacetate copolymer, the silane coupling agent increases the adhesion through chemical bonding with the glass and the ethylene-vinylacetate copolymer. As the content of the silane coupling agent increases, the reaction increases, thereby improving adhesion.
Here, the silane coupling agent is preferably a silane coupling agent having a structure capable of hydrolysis such as unsaturated groups such as vinyl group and methacryloxy, halo alkyl group, mercapto group and epoxy group, alkoxy group and acyl group. Specific examples of such a silane filling agent include vinyltris-β-methoxyethoxysilane, vinyltriacetoxysilane, γ-methacryloxypropyltrimethoxysilane, and γ-glycidoxypropyltrimethoxysilane. Can be. Among these, it is more preferable that the outstanding silane coupling agent which can significantly improve adhesive force is (gamma)-methacryloxypropyl trimethoxysilane and vinyl trimethoxysilane.
Here, the ethylene-vinylacetate copolymer may have excellent adhesiveness and flexibility by setting the content of vinyl acetate to 20 to 35% by weight.
The ethylene-vinylacetate copolymer composition of the present invention further comprises a crosslinking agent, so that the adhesive film for solar encapsulation prepared therefrom is crosslinked with a crosslinkable ethylene-vinylacetate copolymer when encapsulating a solar cell. That is, by this, excellent heat resistance can be provided so that it can be used in a high temperature environment, maintaining transparency.
In particular, it is preferable for the ethylene-vinylacetate copolymer composition of the present invention to use an organic peroxide having a half-life of 30 minutes or less at 140 ° C. as a crosslinking agent in the productivity measurement of a solar cell module. Such organic peroxides include 2,5-dimethylhexane-2,5-dihydro peroxide, di-t-butyl peroxide, dicumylperoxide, α, α'-bis (t-butylperoxyisopropyl) benzene , n-butyl-4,4-bis (t-butylperoxy) butane, 2,2-bis (t-butylperoxy) butane, 1,1-bis (t-butylperoxy) cyclohexane, 1, 1-bis (t-butyl peroxy) 3,3, 3- trimethyl cyclohexane, t-butyl peroxybenzene, benzoyl peroxide, etc. are mentioned. At this time, it is effective to include a crosslinking agent in the ratio of 0.1-5 weight part with respect to 100 weight part of ethylene-vinylacetate copolymers.
In addition, the ethylene-vinylacetate copolymer composition of the present invention preferably further comprises a crosslinking aid in order to further improve the crosslinking function of the crosslinking agent, and such crosslinking aids include a ball saturation group such as an allyl group and a methacryloxy group. And unsaturated compounds such as polyallyl compounds or polymethacryloxy compounds having two or more. Specifically, polyallyl compounds such as triallyl isocyanurate, triallyl cyanurate, diallyl phthalate, diallyl fumarate, and diaryl maleate, ethylene glycol diacrylate, trimetholpropane trimethacrylate and Like polymethacryloxy compounds, divinyl benzene and the like. Among these, it is especially preferable that it is a compound which has two or more allyl groups as a crosslinking aid, and it is more preferable that it is triallyl isocyanurate or diallyl phthalate as a specific example. At this time, it is effective to include a crosslinking aid in a ratio of 5 parts by weight or less with respect to 100 parts by weight of the ethylene-vinylacetate copolymer.
The ethylene-vinylacetate copolymer composition of the present invention may include a photosensitizer as a crosslinking agent, and may be crosslinked by light. Specific examples of the photosensitizer include benzophenone, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, dibenzyl, hexachlorocyclopentadiene, paranitrodiphenyl, para Nitroaniline, 2,4,6-trinitroaniline, 1,2-benzanthraquinone and the like. It is effective to include such a photosensitizer in the ratio of 0.1-3 weight part with respect to 100 weight part of ethylene-vinylacetate copolymers.
The ethylene-vinylacetate copolymer composition of the present invention can be prevented from deterioration of the adhesive film for solar cell encapsulation by including an antioxidant, a light stabilizer, an ultraviolet absorber, etc. as necessary as other additives.
As antioxidant, what is various hindered phenol type or a phosphite type compound is suitable, and as a light stabilizer, what is a hindered amine type compound is suitable. As a ultraviolet absorber, 2-hydroxy-4-methoxy benzophenone, 2,2'- dihydroxy-4- methoxy benzophenone, 2-hydroxy-4- methoxy-2- carboxy benzophenone, 2- Benzophenones such as hydroxy-4-n-octylbenzophenone, 2- (2'-hydroxy-3 ', 5'-ditertiarybutylphenyl) benzotriazole, 2- (2'-hydroxy Salicylic acid ester type compounds, such as -5-methylphenyl) benzotriazole, phenyl salicylate, and p-octylphenyl salicylate, etc. can be used. Such antioxidants, light stabilizers or ultraviolet absorbers are preferably included in 3 parts by weight or less based on 100 parts by weight of ethylene-vinylacetate copolymer.
The adhesive film for solar cell encapsulation of the present invention is formed by molding the solar cell encapsulation ethylene-vinylacetate copolymer composition according to an embodiment of the present invention as a film, as shown in Figure 1, the upper and lower sides of the solar cells (cells) It is used after encapsulation.
Adhesive film for solar cell encapsulation of the ethylene-vinylacetate copolymer composition for solar cell encapsulation according to an embodiment of the present invention using a T-die extruder, calendar molding machine, inflation molding machine, etc. It can be molded.
That is, the ethylene-vinylacetate copolymer and the silane coupling agent (silnae coupling) and the organic peroxide, the crosslinking aid and other additives which are added as needed, in advance dry blended, and the hopper of the extruder To supply. At this time, when mix | blending an organic peroxide as a crosslinking agent, it is preferable to shape | mold on conditions at the temperature which organic peroxide does not decompose. Moreover, although the thickness in particular is not restrict | limited, Usually, it can be about 0.2-1.2 mm.
The solar cell encapsulation adhesive film according to the second embodiment of the present invention prepared as described above is prepared from the ethylene-vinylacetate copolymer composition for encapsulation of the solar cell according to one embodiment of the present invention, and has an initial adhesive strength of 25 N / cm or more. It is preferable that the adhesive force change rate is 65% or less. That is, since the initial adhesive force is 25N / cm or more, it is possible to more strongly bond the solar cell and the upper and lower protective material, the adhesive force change rate is 65% or less, thereby preventing the phenomenon of falling with the upper and lower protective material when using the solar cell for a long time, It is possible to prevent the power generation efficiency from falling.
In addition, the degree of crosslinking (ie, gel fraction) of the ethylene-vinylacetate copolymer composition is preferably in the range of 70 to 98%, particularly in the range of 85 to 98% in consideration of the insulating properties of the adhesive film. More preferably. Crosslinking can heat the ethylene vinyl acetate copolymer composition of this invention about 100-200 degreeC.
The solar cell module according to the third embodiment of the present invention can manufacture a solar cell module by sealing solar cells using the solar cell encapsulation adhesive film. As such a solar cell module, various types can be illustrated. For example, a structure in which an adhesive film is sandwiched from both sides of the solar cell element, such as an upper transparent protective material, an adhesive film, a solar cell element, an adhesive film, and a lower protective material, and another example is a solar cell element (fluorine) formed on the upper transparent protective material. Sputtering an amorphous solar cell element on a resin sheet or glass) / adhesive film / lower substrate protective material. The solar cells used herein include silicon solar cells such as monocrystalline silicon, polycrystalline silicon, and amorphous silicon, and various solar cell cells such as compound semiconductor solar cells such as gallium / indium / copper / selenide and cadmium / tedide. Can be used. The adhesive film for solar cell encapsulation of the present invention can be usefully used for all such solar cells.
As an upper protective material which comprises a solar cell module, glass, an acrylic resin, polycarbonate, polyester, a fluorine-containing resin, etc. can be used. As the lower protective material, a single layer or a multilayer film such as a metal or various thermoplastic resin films is used, and for example, metals such as tin, aluminum, stainless steel, inorganic materials such as glass, polyester, inorganic vapor deposition polyester, and fluorine One-layer or multilayer sheets, such as containing resin and polyolefin resin, can be used. The adhesive film of the present invention exhibits excellent adhesion to such an upper or lower protective material.
In the production of the solar cell module, the crosslinking agent is not substantially decomposed, and the solar cell encapsulation adhesive film of the present invention may be heated to a meltable temperature to be bonded to the solar cell and the protective material, and crosslinking may be performed.
Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
The raw material and the physical property evaluation method using an Example and a comparative example are shown below.
Property measurement method
(1) Gel fraction measurement
The adhesive film was pressurized at a pressure of 100 Pa at 150 ° C. for 20 minutes using a laminator to produce a crosslinked film. 1 g (W1) of each film was immersed in toluene, heated at 60 ° C. for 4 hours, insoluble content was collected with a filter paper, vacuum dried at 60 ° C., and the weight (W 2) was obtained. It calculated | required by the following formula.
Gel fraction (%) = W2 / W1 X 100
(2) adhesive force measurement
First, glass, film, and PET are prepared in 2 cm x 10 cm size. Two specimens were prepared by pressing glass / adhesive film / PET at a pressure of 100 Pa for 20 minutes at 150 ° C. using a laminator. The adhesion area of glass / adhesive film / PET is 2cm × 4cm.
(a) Initial Adhesion: One of the prepared specimens is subjected to 180 degree peel evaluation using Universal Testing Machine (UTM). First, the PET film is separated from the adhesive film, and the glass and the adhesive film are fixed to the UTM. At this time, the force required to separate the adhesive film and glass is the initial adhesive force (B1).
(b) Adhesion rate change rate: One of the prepared specimens was left at 85 ° C and 85% relative humidity for 1,000 hours, followed by 180 ° peel evaluation using a universal testing machine (UTM). . First, the PET film is separated from the adhesive film, and the glass and the adhesive film are fixed to the UTM. At this time, the force required to separate the adhesive film and the glass is the adhesive force (B2), and the adhesive force change rate is calculated by the following formula (1).
% Change in adhesive force = [(B1-B2) / B1] × 100
Examples and Comparative Examples
The raw material components used in the Example and the comparative example are as follows.
EVA copolymer: Ethylene-vinylacetate copolymer (vinyl acetate content 33%)
Silane coupling agent: γ-methacryloxy propyl trimethoxy silane (trade name: KBM 503, Shin-Etsu Chemical)
Crosslinking agent: t-butyl- (2-ethylhexyl) monoperoxycarbonate (trade name: TBEC, CYBERACHEMA)
Crosslinking aid: triallyl isocyanurate (trade name: TAIC, Japanese painting island)
The components and the component ratios of the ethylene-vinylacetate copolymer compositions constituting Examples 1 to 10 and Comparative Examples 1 and 2 were mixed as shown in Table 1, left to stand for one day, and the resulting impregnated pellets were processed at an extrusion temperature of 100. The film was produced at ℃. In addition, the results of measuring the physical properties of each adhesive film thus obtained are shown in Table 1.
1 is a conceptual diagram of a solar cell module including an adhesive film for solar cell encapsulation.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994010A (en) * | 2012-12-07 | 2013-03-27 | 天威新能源控股有限公司 | EVA (Ethylene Viny Acetate) hot melt adhesive packaging material and preparation method thereof |
| KR101414239B1 (en) * | 2012-02-20 | 2014-07-03 | 에스케이씨 주식회사 | Solar battery module comprising white eva resin layer |
| CN108611025A (en) * | 2018-04-10 | 2018-10-02 | 浙江祥邦科技股份有限公司 | A kind of super fast curing solar energy packaging adhesive film and preparation method thereof |
| CN110791232A (en) * | 2019-11-28 | 2020-02-14 | 江西省科学院应用化学研究所 | Modified EVA adhesive film and preparation method thereof |
| WO2024071561A1 (en) * | 2022-09-30 | 2024-04-04 | 주식회사 엘지화학 | Encapsulant film composition, and encapsulant film comprising same |
-
2009
- 2009-09-30 KR KR20090092876A patent/KR20110035246A/en not_active Application Discontinuation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101414239B1 (en) * | 2012-02-20 | 2014-07-03 | 에스케이씨 주식회사 | Solar battery module comprising white eva resin layer |
| CN102994010A (en) * | 2012-12-07 | 2013-03-27 | 天威新能源控股有限公司 | EVA (Ethylene Viny Acetate) hot melt adhesive packaging material and preparation method thereof |
| CN108611025A (en) * | 2018-04-10 | 2018-10-02 | 浙江祥邦科技股份有限公司 | A kind of super fast curing solar energy packaging adhesive film and preparation method thereof |
| CN110791232A (en) * | 2019-11-28 | 2020-02-14 | 江西省科学院应用化学研究所 | Modified EVA adhesive film and preparation method thereof |
| WO2024071561A1 (en) * | 2022-09-30 | 2024-04-04 | 주식회사 엘지화학 | Encapsulant film composition, and encapsulant film comprising same |
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