KR101210322B1 - Adhesive sheet composition for solar battery, adhesive sheet and solar battery using the same - Google Patents
Adhesive sheet composition for solar battery, adhesive sheet and solar battery using the same Download PDFInfo
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- KR101210322B1 KR101210322B1 KR1020090064570A KR20090064570A KR101210322B1 KR 101210322 B1 KR101210322 B1 KR 101210322B1 KR 1020090064570 A KR1020090064570 A KR 1020090064570A KR 20090064570 A KR20090064570 A KR 20090064570A KR 101210322 B1 KR101210322 B1 KR 101210322B1
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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 a solar cell adhesive sheet composition, a solar cell adhesive sheet and a solar cell using the same.
Adhesive sheet composition for solar cells according to the present invention comprises an ethylene copolymer, an organic peroxide and two or more antioxidants.
The adhesive sheet composition for a solar cell having the above composition can suppress the occurrence of yellowing during the reliability test for a long time after manufacturing the solar cell module, it can be usefully used in the manufacture of the adhesive sheet for solar cells that can maintain the transmittance continuously.
Solar cell module, adhesive sheet, reliability test
Description
The present invention relates to a solar cell adhesive sheet composition, a solar cell adhesive sheet and a solar cell using the same.
As environmental problems increase in recent years, hydro power, wind power, and solar power have come into the spotlight as clean energy. Among them, solar power generation using solar energy is growing in recent years as an energy source that is clean and useful for preventing global warming. As a representative of this photovoltaic power generation, a solar cell using semiconductors such as monocrystalline silicon, polycrystalline silicon, amorphous silicon and the like can be given. The solar cell is a practical use of the principle that emits a current when sunlight is irradiated to the semiconductor.
In addition, the solar cell module is generally manufactured by protecting a solar cell element such as silicon, gallium arsenide, copper-indium selenium with an upper transparent protective material and a lower substrate protective material, and fixing the solar cell element and the protective material with an adhesive sheet. will be.
At this time, the adhesive sheet used in the solar cell module is required to have a property of excellent transmittance and adhesiveness and less yellowing in the reliability test in order to increase the power generation efficiency of the solar cell. The reason is that the place where the solar cell is installed is the roof of a house, a portable power generator, etc., but all of them are places where the sun shines and are exposed to the natural state outdoors. When the solar cell module is exposed in such a state, the adhesive sheet used for the solar cell module has a problem in that yellowing occurs due to deterioration due to moisture or heat.
Until now, to improve the power generation efficiency of solar cell devices by adhesive sheets, adhesive sheets were prepared by adding known antioxidants to compositions such as ethylene copolymers, organic peroxides, and crosslinking agents. This did not suppress the occurrence. In addition, there is a problem that the transmittance due to yellowing is lowered.
It is an object of the present invention to provide a solar cell adhesive sheet composition which is excellent in yellowing generation suppression effect, transmittance and adhesiveness, and which does not reduce power generation efficiency when manufacturing a solar cell module.
Still another object of the present invention is to provide a solar cell adhesive sheet capable of maintaining a low yellowing rate and a sustained transmittance even after long-term exposure to the external environment.
Still another object of the present invention is to provide a solar cell having a low yellowing incidence rate and a sustained transmittance even after long-term exposure to the external environment.
In order to achieve the object of the present invention,
A solar cell adhesive sheet composition comprising an ethylene copolymer, an organic peroxide and at least two or more antioxidants, wherein the antioxidant comprises a phenolic antioxidant and a thioester antioxidant, and the antioxidant is an adhesive sheet composition for a solar cell 0.01 to 0.5 parts by weight based on 100 parts by weight, the weight ratio of the phenolic antioxidant and thioester antioxidant is 0.2: 0.1 ~ 0.1: 0.2, the adhesive sheet for solar cells produced using the composition is 1000 hours The ΔYI value in the heat resistance test (85 ° C) is 0.1 to 0.5, and the ΔYI value in the humidity test (85 ° C and 90% RH) is 1.9 to 2.5 and 500 hours. It provides an adhesive sheet composition for a solar cell, characterized in that -0.05 ~ -0.8.
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In order to achieve another object of the present invention, there is provided a solar cell adhesive sheet made of an adhesive sheet composition according to the present invention.
For still another object of the present invention, there is provided a solar cell device, an upper protective material located above the solar cell device, and a lower protective material located below the solar cell device, wherein the solar cell device and the protective material are bonded according to the present invention. Provided is a solar cell fixed with a sheet.
Adhesive sheet prepared by the adhesive sheet composition for solar cells according to the present invention is less yellowing occurs, thereby maintaining the adhesiveness without a decrease in transmittance, it is possible to increase the power generation efficiency of the solar cell using the same. In addition, the adhesive sheet for solar cells according to the present invention is less influenced by temperature or moisture, the solar cell using the same to maintain a high transmittance and high power generation efficiency continuously for a long time even when exposed to the external environment such as sunlight, wind or rain Can ensure a long service life.
Hereinafter, the present invention will be described in more detail, but for the purpose of describing the present invention, it is not intended to limit the scope of the present invention.
It provides an adhesive sheet composition for a solar cell comprising an ethylene copolymer, an organic peroxide and at least two antioxidants.
The ethylene copolymer may be used in an amount of 80 to 98 parts by weight based on 100 parts by weight of the adhesive sheet composition for solar cells. Preferably 85 to 95 parts by weight is used. If the ethylene copolymer is more than 98 parts by weight, there is a problem that the curing is not, and if it is less than 80 parts by weight, there is a problem that the adhesive strength is poor.
The organic peroxide is 0.5 to 15 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the adhesive sheet composition for solar cells. When the organic peroxide is used in excess of 15 parts by weight, the crosslinking speed is high, and thus the processability is difficult.
The weight part of the antioxidant added is used 0.01 to 0.5 parts by weight based on 100 parts by weight of the adhesive sheet composition for solar cells. More preferably, 0.03-0.3 weight part is used. If the antioxidant is less than 0.01 parts by weight, a yellowing problem occurs, and if more than 0.5 parts by weight there is a problem that the mechanical properties of the adhesive sheet for solar cells.
In addition, antioxidant should not be used individually, and must mix and use 2 or more types. If the antioxidant is used alone, there is a problem that the yellowing problem occurs during the reliability test after manufacturing the solar cell module to reduce the power generation efficiency.
In addition, when the antioxidant is used by mixing two or more types, the weight ratio is used as 0.1: 0.9 ~ 0.9: 0.1. More preferably, 0.3: 0.7 to 0.7: 0.3 is used. If used below or above the weight ratio mentioned above, there is no effect of inhibiting yellowing. When mixing 3 or more types of antioxidants, it is preferable that at least one component is 5-95 weight part with respect to 100 weight part of all antioxidants.
In order to achieve another object of the present invention, there is provided a solar cell adhesive sheet made of an adhesive sheet composition according to the present invention.
The adhesive sheet has a ΔYI value of 0.1 to 0.5 in a 1000 hour heat resistance test (85 ° C.), and a ΔYI value of 1.9 to 2.5 and a 500 hour weather test in a 1000 hour humidity test (85 ° C., 90% RH). ΔYI value in) is -0.05 to -0.8.
The present invention may further include at least one additive selected from a crosslinking agent, a silane coupling agent, and an ultraviolet absorber in addition to the two antioxidants added to the ethylene copolymer and the organic peroxide composition.
(A) Ethylene Copolymer
In the adhesive sheet composition for solar cells of the present invention, the ethylene copolymer has a vinyl acetate content of 20 to 40% by weight, preferably 25 to 35% by weight, in consideration of transparency, flexibility, and impregnation of organic peroxides. do. In addition, the ethylene copolymer has a melt flow rate of 0.1 to 100 g / 10 min, preferably 0.5 to 50 g / 10 min at 190 degrees and a 2.160 kg load in consideration of moldability and mechanical properties.
Suitable ethylene copolymers are specifically ethylene vinyl ester copolymers such as ethylene vinyl acetate copolymers, ethylene? Ethylene-unsaturated carboxylic acid ester copolymers such as methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-isobutyl acrylate copolymer, ethylene-n-butyl acrylate copolymer, ethylene-acrylic acid copolymer Ethylene unsaturated unsaturated carboxylic acid copolymers, such as a copolymer, an ethylene methacrylic acid copolymer, an ethylene isobutyl acrylate methacrylic acid copolymer, an ionomer, etc. can be illustrated as a representative example. Among these, in consideration of the suitability to the required physical properties of the adhesive sheet composition for solar cells such as moldability, transparency, flexibility, adhesiveness, light resistance, and impregnating property of organic peroxide, ethylene? Preference is given to using vinyl acetate copolymers.
Examples of commercially available ethylene-vinyl acetate copolymers include MA-10 (32% vinyl acetate content and 40 g / 10 min melt flow rate) of TPC, PV 1650 (33% vinyl acetate content, melt flow content) from DuPont 31 g / 10 min) PV 1400 (32% vinyl acetate content, melt flow rate 43 g / 10 min) PV 1410 (vinyl acetate content 32%, melt flow rate 43 g / 10 min) Can be used
(B) organic peroxide
As an organic peroxide used for the adhesive sheet composition for solar cells in this invention, the decomposition temperature (temperature whose half life is 1 hour) is 150 degrees or less, and the liquid thing is used at normal temperature.
Examples of organic peroxides include tertiary butyl cumyl peroxide (142 degrees), dicumyl peroxide (135 degrees), 2,5-dimethyl-2,5-bis (tertiary butyl peroxy) hexane (140 degrees), 2,5 -Dimethyl-2,5-bis (tertiary butyl peroxy) hexyn-3,1,3-bis (tertiary butyl peroxy isopropyl) benzene (137 degrees), tert-butyl peroxide (149 degrees), etc. Dialkyl peroxide, tertiary butyl peroxy isobutylate (102 degrees), tertiary butyl peroxy maleic acid (110 degrees), tertiary butyl peroxy isonanoate (123 degrees), tertiary butyl peroxy iso Propyl carbonate (119 degrees), tertiary butyl peroxy-2-ethylhexyl carbonate (121 degrees), tertiary butyl peroxy acetate (123 degrees), tertiary butyl peroxy benzoate (125 degrees), Alkyl peroxy esters such as 2,5-dimethyl-2,5-bis (benzoylperoxy) hexane (118 degrees), 2,5-dimethylhexyl-2,5-bis peroxy benzoate, and 1,1-bis (3-butyl peroxy) -3,3,5-trimethylcyclohexane (112 degrees), 1,1-bis (tertiary butyl peroxy) cyclohex (112 degrees), 1,1-bis (tertiary amyl peroxy) cyclohexane (112 degrees), 2,2-bis (tertiary butyl peroxy) butane (112 degrees), n-butyl-4,4- Peroxy ketals, such as bis (tertiary butyl peroxy) valerate (129 degree), ethyl-3, 3-bis (tertiary butyl peroxy) butyrate (135 degree), etc. can be illustrated.
Among these, in view of the ease of impregnation of the ethylene copolymer into the molded article, it is preferable to exhibit a liquid phase at normal temperature.
An organic peroxide may be used independently and may mix and use 2 or more types. When using as a mixture of 2 or more types, it is preferable that a mixture shows a liquid state at normal temperature. Here, the liquid phase at room temperature is not only a liquid at room temperature as a single substance, but also includes an organic peroxide as a mixture when two or more organic peroxides are mixed.
As dialkyl peroxide, it is preferable to use a decomposition temperature of 130-150 degreeC, preferably 135-150 degreeC in half-life 1 hour. In the case of using the dialkyl peroxide, there is an advantage that it is difficult to cause swelling phenomenon in the sealing process.
(C) antioxidant
Antioxidants used in the adhesive sheet composition for solar cells in the present invention may be used phenolic antioxidant, phosphite antioxidant, thioester antioxidant, amine antioxidant, inorganic antioxidant, etc., commercially available antioxidant Among the phenolics, Aldrich's BHT, hydroquinone, Shiva's iganox 1076, iganox 1035, iganox 1010, irganox 1081, iganox 1330, irganox 1425 WL, irganox 3114, irganox E201, irganox MD 1024, irganox PS 800, irganox PS 802 , Sumitomo Chemical's sumilizer GA-80, AO-76, AO-101, Chemtura's ANOX 70, etc.The phosphite system includes Chemtura's Weston 618, Shiva's irgafos 12, irgafos 38, irgafos 126, irgafos 168, irgafos P-EPQ, Sumitomo Chemical's P-16, sumilizer GP, and the thioesters include Naugard 412 from Chemtura, irganox 1035 from Shiva, Sumilizer TPL from Sumitomo Chemical, sumilizer TPM, sumilizer TPS, and sumilize. r TP-D and the like, and the amines include Chemtura's Naugard 445, antigene 6C, etc., and the inorganic systems include DHT-4A, DHT-4A2, and DHT-4C from Kangshin Industries. In addition, the above products are mixed with two or more antioxidants of Shiva Corporation iganox B1411, irganox B1412, irganox B215, irganox B220, irganox B225, irganox B501W, irganox B561, irganox B900, irganox B921, irganox HP2215, irganox HP2225, irganox HP2251, irganox HP2411, irganox HP2921, irganox XP 420, irganox XP620, and the like.
It is preferable to include at least a phenolic antioxidant when the two or more kinds of antioxidants are mixed. For example, it is preferable to use a phenolic antioxidant and a thioester antioxidant in mixture of antioxidant, or to mix and use a phenolic antioxidant and inorganic antioxidant.
The weight part of the antioxidant added is used 0.01 to 0.5 parts by weight based on 100 parts by weight of the adhesive sheet composition for solar cells. More preferably, 0.03 to 0.3 parts by weight is used. If the antioxidant is less than 0.01 parts by weight, a yellowing problem occurs, and if more than 0.5 parts by weight there is a problem that the mechanical properties of the adhesive sheet for solar cells.
(D) various additives
Other various additives can be added to the adhesive sheet composition for solar cells of this invention as needed. As such an additive, a crosslinking agent, a silane coupling agent, a ultraviolet absorber, etc. can be mentioned specifically ,.
The silane coupling agent may improve the adhesion between the low iron tempered glass and the back sheet and the EVA sheet when the solar cell module is manufactured after the sheet is manufactured with the adhesive sheet composition for solar cells.
As a silane coupling agent, the compound which has a hydrolyzable group, such as an alkoxy group, is mentioned together with the ball saturation group, an amino group, an epoxy group, etc., such as a vinyl group, an acryloxy group, and a methacryloxy group. Specific examples of the silane coupling agent include N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane and γ-aminopropyltriethoxy. Silane, (gamma)-glycidoxy propyl trimethoxysilane, (gamma)-methacryloxypropyl trimethoxysilane, etc. can be illustrated.
It is suitable to mix | blend a silane coupling agent about 0.1-2 weight part with respect to 100 weight part of adhesive sheets compositions for solar cells. If it is blended below or above, there is no effect of adhesive strength.
Examples of the ultraviolet absorbent that can be added to the present invention include various types of substances such as benzophenone series, benzotriazole series, triazine series, and salicylic acid ester series. Commercially available UV absorbers include TINUVIN 328, TINUVIN 1577 FF, TINUVIN 120, and Cimasorb 81 from Ciba, Sumitosorb Chemical, Sumisorb 130, Sumisorb 350, Sumisorb 110, Seesorb 102 from Ciprocasei, seesorb 707, seesorb 101 may be used.
It is suitable to mix | blend a ultraviolet absorber about 0.1-2 weight part with respect to 100 weight part of adhesive sheets compositions for solar cells. If it is added below 0.1 part by weight, there is no UV cut effect, and when added above 2 parts by weight, a yellowing problem occurs.
The crosslinking agent which can be added to the present invention is effective in promoting the crosslinking reaction to increase the degree of crosslinking of the ethylene copolymer, and specific examples thereof include polyunsaturated compounds such as polyallyl compounds and poly (meth) acryloxy compounds. More specifically, polyallyl compounds such as triallyl isocyanurate, triallyl cyanurate, diallyl phthalate, diallyl fumarate, and diallyl maleate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, and trimethyl Poly (meth) acryloxy compounds, such as all propane trimethacrylate, dinynebenzene, etc. are mentioned.
It is effective to mix | blend a crosslinking agent in the ratio of about 0.5-5 weight part with respect to 100 weight part of adhesive sheet compositions for solar cells. If it is 0.5 parts by weight or less, there is no effect of promoting crosslinking, and if it is 5 parts by weight or more, there is a problem of yellowing.
The adhesive sheet for a solar cell according to the present invention can be produced by a known sheet forming method using a T-die extruder, a calendar molding machine and the like. For example, an organic peroxide, an antioxidant, and a silane coupling agent, a crosslinking aid, a UV absorber, a light stabilizer, etc., added to the ethylene copolymer as needed, are dry blended in advance and supplied to the hopper of the T-die extruder, and sheet-shaped. It can obtain by extrusion molding.
The solar cell according to the present invention includes a solar cell element, an upper protective material positioned above the solar cell element, and a lower protective material positioned below the solar cell element, wherein the solar cell element and the protective material are fixed by an adhesive sheet. Referring to FIG. 2, the solar cell module may be temporarily bonded to the solar cell device, the low iron tempered glass, and the back sheet at a temperature at which the organic peroxide does not substantially decompose and the adhesive sheet melts. Then, the temperature is increased (100-180 ° C.) to proceed with sufficient adhesion and crosslinking of the adhesive sheet to manufacture a solar cell.
The present invention will be described in more detail by the following examples and comparative examples, the following examples are only some specific examples of the present invention and are not intended to limit or limit the protection scope of the present invention.
≪ Example 1 >
1.5 parts by weight of organic peroxide Alkema Lufenox 101, 2 parts by weight of crosslinking agent TAIC, TAIC 2 parts by weight of ethylene-vinyl acetate copolymer (DuPont PV 1650), 0.5 parts by weight of silane coupling agent Shin-Etsu Co., Ltd. KBM 503, UV absorber Sumitomo 0.3 parts by weight of chemical company sumisorb 130, 0.2 parts by weight of antioxidant Sumitomo Chemical Co., Ltd. AO 101, 0.1 parts by weight of TPS were impregnated with a mixer at 25 degrees for 1 hour, using a planetary single extruder (screw diameter of 40 mm, L / D = 26). Then, a 0.5 mm adhesive sheet was produced at a processing temperature of 85 degrees.
<Example 2>
A 0.5 mm adhesive sheet was prepared in the same manner as in Example 1 except that 0.1 part by weight of antioxidant Sumitomo Chemical Co., Ltd. AO was used in 0.1 part by weight and 0.2 part by weight of TPS.
<Example 3>
A 0.5 mm adhesive sheet was prepared in the same manner as in Example 1 except that the antioxidant Sumitomo Chemical Co., Ltd. AO 101 was used instead of 0.2 parts by weight of GA-80.
<Example 4>
A 0.5 mm adhesive sheet was prepared in the same manner as in Example 1 except that 0.3 parts by weight of GA-80 was used instead of the antioxidant Sumitomo Chemical AO 101 product.
<Example 5>
An 0.5 mm adhesive sheet was prepared in the same manner as in Example 1 except that 0.2 parts by weight of GA-80 was used instead of the antioxidant Sumitomo Chemical AO 101 product and 0.2 parts by weight of TP-D was used instead of the TPS product.
<Example 6>
A 0.5 mm adhesive sheet was prepared in the same manner as in Example 1 except that 0.15 parts by weight of Sumitomo Chemical Co., Ltd. AO 101, 0.15 part by weight of TPS, and 0.1 part by weight of GA-80 were used.
≪ Example 7 >
A 0.5 mm adhesive sheet was prepared in the same manner as in Example 1 except that 0.1 parts by weight of Sumitomo Chemical Co., Ltd. AO 101, 0.1 parts by weight of TPS, 0.1 parts by weight of GA-80, and 0.1 parts by weight of TP-D were used.
≪ Example 8 >
A 0.5 mm adhesive sheet was prepared in the same manner as in Example 1 except that 0.02 part by weight of antioxidant Sumitomo Chemical Co., Ltd. AO and 0.01 part by weight of TPS were used.
≪ Example 9 >
A 0.5 mm adhesive sheet was prepared in the same manner as in Example 1 except that 0.1 parts by weight of Kangshin Industrial Co., Ltd. DHT-4A was used in place of 0.1 parts by weight of antioxidant Sumitomo Chemical Co., Ltd. TPS.
≪ Comparative Example 1 &
1.5 parts by weight of organic peroxide Alkema Lufenox 101, 2 parts by weight of crosslinking agent TAIC, TAIC 2 parts by weight of ethylene-vinyl acetate copolymer (DuPont PV 1650), 0.5 parts by weight of silane coupling agent Shin-Etsu Co., Ltd. KBM 503, UV absorber Sumitomo 0.3 parts by weight of the chemical company sumisorb 130, 0.4 parts by weight of the antioxidant Sumitomo Chemical Co., Ltd. AO 101 was impregnated for 1 hour and adhered 0.5 mm at 85 ° C using a planetary single extruder (screw diameter 40 mm, L / D = 26). The sheet was produced.
Comparative Example 2
A 0.5 mm adhesive sheet was prepared in the same manner as in Comparative Example 1 except that 0.4 parts by weight of Aldrich BHT was used in place of the antioxidant Sumitomo Chemical AO 101 product.
<Experimental Example>
1. Transmittance Measurement
A 0.5 mm adhesive sheet was prepared between the low iron reinforced glass and the back sheet, and melt-bonded by using a vacuum bonding machine for 150 degrees for 20 minutes, and the transmittance was measured using UV (UV 2450 manufactured by SHIMADZU) according to JIS K7105.
2. Reliability Measurement
2.1 Moisture Resistance Test
Two sheets of 0.5 mm adhesive sheet prepared between the low iron tempered glass and the back sheet are inserted and melt-bonded using a vacuum bonding machine for 150 degrees for 20 minutes, and the laminate is left to stand at a constant temperature and humidity of 85 degrees and 90% RH for 1000 hours. After 1000 hours, the yellowing degree ΔYI value was measured using a yellowing meter (NIPPON DENSHOKU's Spectro Color Meter SE 2000).
2.2 Heat Resistance Test
Two sheets of 0.5 mm adhesive sheet prepared between the low iron reinforced glass and the back sheet are put together and melt-bonded using a vacuum bonding machine for 150 degrees for 20 minutes, and the laminate is left to stand for 1000 hours at a constant temperature and humidity of 85 degrees. After 1000 hours, the yellowing degree ΔYI value was measured using a yellowing meter (NIPPON DENSHOKU's Spectro Color Meter SE 2000).
2.3 Weather Test
Two sheets of 0.5 mm adhesive sheet prepared between the low iron reinforced glass and the back sheet are put together and melt-bonded using a vacuum bonding machine for 150 degrees for 20 minutes, and the laminate is allowed to stand for 500 hours in a 75 degree weathering tester. After 500 hours, the yellowness ΔYI value was measured using a yellowing meter (NIPPON DENSHOKU's Spectro Color Meter SE 2000).
3. Adhesive measurement
(A) large low iron tempered glass
Lamination of low iron reinforced glass / crosslinked sheet / PET film by inserting 2 sheets of 0.5 mm EVA sheet manufactured between low iron tempered glass used as upper protective material for solar cell and PET film and melt-bonding using vacuum gluer for 150 ° C for 20 minutes. Sieve was prepared. The adhesive force between the low iron tempered glass and the crosslinked sheet was peeled by hand to the laminate, and the state thereof was observed.
○: Good adhesion ×: Bad adhesion
(B) Backsheet (SFC Corporation T-P-T)
Put two sheets of 0.5 mm EVA sheet manufactured between back sheet used as solar cell lower protective material (SFC Co., Ltd. TPT) and PET film, and melt-bond using 150 ° C for 20 minutes to vacuum the backsheet / crosslinked sheet / PET film. The laminate was produced. The adhesive force between the backsheet and the crosslinked sheet was peeled off by hand in this laminate and the state thereof was observed.
○: Good adhesion ×: Bad adhesion
4. Hardness Measurement
Make a laminated structure of normal glass / release paper film / 2 sheets of 0.5 mm adhesive sheet prepared / release paper film / general glass and prepare a crosslinked sheet using a vacuum bonding machine for 150 degrees. After the crosslinked sheet is prepared, peel off from the release paper film, cut about 1 g (W1) into 100 ml of xylene, heat 110 degrees for 24 hours, filter insoluble content on a 25 mesh wire mesh, and filter the insoluble content 110 degrees. Dry in vacuum oven to get weight. (W2)
Hardness (%) = (W2 / W1) * 100
[Table 1]
1 is a schematic cross-sectional view of a solar cell according to an embodiment of the present invention.
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| KR101298430B1 (en) * | 2011-08-10 | 2013-08-20 | 주식회사 화승인더스트리 | Encapsulant sheet composition for solar cell, encapsulant sheet and photovoltaic module using the same |
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