KR101202573B1 - Composition of Ethylene Vinyl Acetate Copolymer for Solar Cell Encapsulant - Google Patents

Abstract

The present invention relates to an ethylene vinyl acetate copolymer (EVA) composition for a solar cell encapsulation material, using a primary crosslinking agent having a low half-life temperature as a main crosslinking agent and having a relatively high half-life temperature as the ethylene vinyl acetate copolymer resin. By using a small amount of the primary crosslinking agent, the minimum required content of the main crosslinking agent and the minimum required content of the total crosslinking agent can be reduced to minimize problems such as yellowing caused by residual peroxide, and to shorten the crosslinking time to improve productivity by encapsulating solar cells. It relates to a reusable EVA composition.

Description

Ethylene Vinyl Acetate Copolymer Composition for Solar Cell Encapsulant {Composition of Ethylene Vinyl Acetate Copolymer for Solar Cell Encapsulant}

The present invention relates to a solar cell sealing damper ethylene vinyl acetate copolymer composition, of an ethylene vinyl acetate copolymer used in combination the first and second cross-linking agent (hereinafter, referred to hereinafter 'EVA') resin to a specific amount, a crosslinking agent is used The present invention relates to an EVA composition for a solar cell encapsulant that can reduce the total content and at the same time shorten the crosslinking time to improve productivity and reduce yellowing-causing factors.

The solar cell module used for solar power generation uses EVA sheets on both sides of the cell to protect the transparent glass substrate on the side where sunlight is incident and the cell underneath it. Finally, the back is a sheet having excellent water vapor barrier and weather resistance. Laminated with a back sheet.

EVA sheet used in the manufacture of solar cell module contains suitable crosslinking agent and adhesive for cell fixing, and then UV stabilizer to fix the cell by gelation in lamination process and to prevent yellowing due to long-term use. And antioxidants. In the lamination process, which is a process of fixing the cell between the EVA sheets and adhering to the glass and the backsheet, the crosslinking agent decomposes during the heating process to form radicals and induce crosslinking.

Lamination methods currently used in the industry include a standard cure method mainly using dialkylperoxide as a crosslinking agent and a fast cure method mainly using peroxycarbonate and peroxyketal. Among them, the dialkyl peroxide has a problem that the lamination process takes a long time due to the high half-life temperature, which leads to a decrease in productivity. Long lamination processes are also known to cause the loss of added antioxidants and promote the release of acetic acid to inactivate the functionalities of the UV absorbers and UV stabilizers. When the crosslinking time is shortened or the content of the crosslinking agent is increased in order to increase productivity, the amount of residual peroxide increases, which causes yellowing. On the other hand, peroxycarbonate and peroxyketal have the advantage of increasing productivity by shortening the lamination process time due to low half-life temperature, but rapid swelling of the sheet occurs due to the rapid crosslinking process, and rapidly generated decomposition gas is generated in the module. There is a remaining problem.

In order to improve productivity while satisfying the processing properties of the sheet, Japanese Patent 4034382 uses peroxycarbonate and peroxyketal, which have relatively low half-life temperatures, to reduce the mixing ratio of dialkyl peroxide to 10/90 to 90/10. It shows how to use together. In this case, the content of the total peroxide is 0.5 to 3 parts by weight of the present amount of 100 parts by weight of the present, but the cross-linking value in the embodiment, the cross-linking degree of the sheet manufactured under the above conditions is at least in the solar cell module It can be seen that the required crosslinking also does not exceed 80%. And as can be seen in the comparative example of the patent, in order to exceed the crosslinking rate of 80%, the peroxycarbonate and peroxyketal having a low half-life temperature should be used at 1.5 parts by weight, in which case the problem of yellowing due to the increased crosslinking agent It can be seen that. Therefore, the patent does not provide a suitable way to increase productivity while meeting the physical properties required for the solar cell encapsulant.

On the other hand, European Patent Publication EP 2003 701 A1 is a technique for preventing swelling in the lamination process of the sheet, the ratio of one selected from peroxycarbonate and peroxy ketal and dialkyl peroxide is 1/99 to 9/91 We suggest using together. In this case, the swelling prevention and yellowing prevention is illustrated in the examples as effective, but this example does not illustrate the effect for increasing the productivity, of course expected by reducing the peroxycarbonate or peroxyketal low half-life temperature Only yellowing improvement and swelling effect are suggested.

In Korean Patent Laid-Open Publication No. 2007-0101875, a dialkyl peroxide / peroxycarbonate is used at a ratio of 2/8 in the presence of 2 parts by weight of triallyl isocyanurate as a crosslinking aid to reduce swelling and increase crosslinking speed. Here's how. However, in this case, there is no decrease in the total amount of peroxide, and the increase in the crosslinking speed (relative comparison with the torque value of the crosslinking sheet) shows a value similar to that of using dialkylperoxide alone, and thus there is no effect of increasing productivity. In addition, there is no proposal to reduce the amount of residual peroxide.

U.S. Patent No. 6,093,757 addresses the problem of residual peroxides that are a problem in the use of dialkylperoxides, the consumption of antioxidants and UV stabilizers and the generation of color-causing substances that occur during long lamination times, and the use of peroxycarbonates. 1,1-di- (t-butylperoxy) -3,3,5-trimethylcyclohexane (trade name Loperox 231, Aremaka Co., Ltd.) having a low half-life temperature in order to improve productivity by solving the problem of a large amount of gas components. Specifies the use of. The patent indicates that the residual amount is less than that of dialkylperoxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, and in the fast cure lamination condition, t-butyl- ( 2-ethylhexyl) monoperoxycarbonate shows the same level. In the yellowing test at 85 ° C., the type of additive used is different, which makes it difficult to directly compare. Therefore, the above example is not a proper presentation for improving commercial productivity.

An object of the present invention, in the production of EVA sheet for solar cell encapsulant, to minimize the amount of crosslinking agent added to obtain the target crosslinking degree in the selective presence of the crosslinking aid to prevent the occurrence of yellowing and at the same time to improve the productivity of the solar cell module manufacturing It is to provide a EVA composition for solar cell encapsulation material that can increase, and minimize the residual peroxide content, to prevent the loss of additives such as antioxidants and UV stabilizers in the EVA sheet.

EVA composition for solar cell sealing materials which concerns on this invention is peroxy ketal whose 1 hour half-life temperature is 110-120 degreeC, and per hour whose 1-hour half-life temperature is 90-130 degreeC with respect to 100 weight part of ethylene vinyl acetate copolymer resins. 0.5 to 0.8 parts by weight of a primary crosslinking agent selected from oxycarbonates, and 0.02 to 0.05 parts by weight of a second crosslinking agent selected from dialkyl peroxides having a half-life temperature of 130 to 150 ° C for one hour. It is characterized by.

The EVA resin used in the present invention has a vinyl acetate (VA) content of 23 to 35% by weight, preferably 25 to 32% by weight, and a melt index (190 ° C., measured at a load of 2.16 kg) of 6 to 30 g / 10 minutes, preferably 10 ~ 30g / 10 minutes is preferable, if the content of the vinyl acetate is out of the range is not preferred transparency, flexibility and blocking resistance is not preferred, if the melt index is out of the range sheet Moldability and mechanical properties are not preferable because of the poor.

The half-life temperature of the primary crosslinking agent used in the present invention is preferably lower than the half-life temperature of the secondary crosslinking agent, which means that the limiting amount of the primary crosslinking agent (minimum required amount to meet the required crosslinking degree) is a small amount of secondary crosslinking agent. This is because it can be lowered, thereby also minimizing the residual peroxide amount, it is possible to improve the productivity by shortening the crosslinking time for achieving the target crosslinking degree.

As the primary crosslinking agent, at least one selected from peroxy ketal having a 1 hour half life temperature of 110 to 120 ° C. or peroxy carbonate having a 1 hour half life temperature of 90 to 130 ° C. may be used. Examples include t-butyl-2-ethylhexyl monoperoxycarbonate, 1,1-di (t-amylperoxy) cyclohexane, 1,1-di (t-butylperoxy) -3,3,5 -Trimethylcyclohexane, 1,1-di (t-butylperoxy) cyclohexane, and the like, and specific examples of the peroxycarbonate are 2,5-dimethyl-2,5-di- (2-ethylhexa Nonylperoxy) hexane, t-amylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, t-amyl (2-ethylhexyl) monoperoxycarbonate, t-butyliso Propyl monoperoxycarbonate, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butyl- (2-ethylhexyl) monoperoxycarbonate, t-amylperoxybenzoate, tertiary butyl Peroxyacetate, t-butylperoxy-3 , 5,5-trimethylhexanoate and t-butylperoxybenzoate and the like.

As the secondary crosslinking agent, one or more dialkyl peroxides having a half-life temperature of 130 to 150 ° C. higher than the primary crosslinking agent may be used. Specific examples thereof include dicumyl peroxide, 2,5-dimethyl-2,5. -Di (t-butylperoxy) hexane, α, α'-di (t-butylperoxy) diisopropylbenzene, di-t-amylperoxide, di-t-butylperoxide, 2,5-dimethyl -2,5-di (t-butylperoxy) hexyn-3 and the like.

The content of the primary crosslinking agent is preferably 0.5 to 0.8 parts by weight based on 100 parts by weight of the EVA resin, if the content is less than 0.5 parts by weight does not reach the minimum required degree of crosslinking 80% is not preferred, 0.8 parts by weight If exceeded, the peroxide is not used up in the lamination process, and the remaining amount increases, which is undesirable because it acts as a yellowing-causing material.

The content of the secondary crosslinking agent is preferably 0.02 to 0.05 parts by weight, in particular 0.025 to 0.05 parts by weight. If the content is less than 0.02 parts by weight, the effect of the secondary crosslinking agent is not exhibited. In the fast type lamination process, the residual amount of the secondary crosslinking agent is increased to increase yellowing, which is not preferable.

EVA composition for solar cell encapsulation according to the present invention, in addition to the crosslinking agent may further include a crosslinking aid.

There is no limitation in particular in the kind of said crosslinking adjuvant, As a specific example, Polyallyl compound, such as a triallyl isocyanurate, a triallyl cyanurate, a diallyl phthalate, a diallyl fumarate, a diallyl maleate, etc., and One or more types selected from acrylate compounds such as ethylene glycol diacrylate, ethylene glycol dimethacrylate and trimethylolpropane trimethacrylate can be used.

The content of the crosslinking aid is preferably 0.1 to 3 parts by weight, more preferably 0.3 to 1 part by weight with respect to 100 parts by weight of EVA resin, and when used less than 0.1 part by weight, the effect of the crosslinking aid is less than 3 parts by weight. If the crosslinking aid is not effective, it is not preferable.

In the EVA composition for solar cell encapsulation according to the present invention, if necessary, it may further include one or more additives selected from antioxidants, UV absorbers, UV stabilizers and silane coupling agents.

There is no restriction | limiting in particular in the kind of said antioxidant, As a specific example, it is tetratet (methylene (3, 5- di-t- butyl- 4-hydroxy hydrocinnamic acid)) methane, 3, 5- di-t- One or more selected from butyl-4-hydroxyhydrocinnamate octadecyl, tris (2,4-di-t-butylphenyl) phosphite, and tris (nonylphenyl) phosphite may be used, and the antioxidant The content of is preferably 0.01 to 0.5 parts by weight with respect to 100 parts by weight of the EVA resin, and beyond the above range, there is no effect of the antioxidant or rather it is not preferable because the reactant with the peroxide acts as a yellowing agent.

There is no restriction | limiting in particular in the kind of the said UV absorber, As a specific example, 2-hydroxy-4- methoxy benzophenone, 2-hydroxy-4- methoxy-2'- carboxy benzophenone, 2-hydroxy- 4-octyloxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-hydroxy-4-n-octadecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2 -Hydroxy-4-methoxy-5-sulfobenzophenone, 2-hydroxy-5-chlorobenzophenone, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzo One or more selected from phenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone and 2,2 ', 4,4'-tetrahydroxybenzophenone can be used, and the UV absorber The content of is preferably 0.05 to 0.5 parts by weight with respect to 100 parts by weight of the EVA resin, it is not preferable because the UV absorbing effect or the reactant with the peroxide acts as a yellowing agent outside the above range.

There is no restriction | limiting in particular in the kind of said UV stabilizer, As a specific example, bis-2,2,6,6, -tetramethyl-4- piperidinyl sebacate, bis-1-methyl-2,2,6 , 6, -tetramethyl-4-piperidinyl sebacate, 2 (2'-hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole, 2- (2-hydroxy-3, One or more selected from 5-di-t-amylphenyl) -2H-benzotriazole may be used, and the content of the UV stabilizer is preferably 0.05 to 0.5 parts by weight based on 100 parts by weight of EVA resin, and 0.05 parts by weight. When the amount is less than the use, there is no effect of removing the physical properties of the EVA, such as alkyl oxide and peroxide, and when it is used in excess of 0.5 parts by weight, the increase is almost not effective.

The silane coupling agent is used to improve the adhesion between the EVA sheet and the glass or the cell, and the type thereof is not particularly limited, and specific examples include γ-methacryloxypropyltrimethoxysilane and N- (β -Aminoethyl) -γaminopropyltrimethoxysilane, N- (β-aminoethyl) -γ-aminopropylmethyldimethoxysilane, γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane One or more kinds selected from may be used, and the content of the silane coupling agent is preferably 0.05 to 1 parts by weight based on 100 parts by weight of EVA resin, and when used below 0.05 parts by weight, there is almost no adhesive effect by the coupling agent. In case of using more than 1 part by weight, the increase effect is almost not preferable.

The additives may be dry blended into the EVA resin and introduced into the extruder, or may be side fed to the extruder separately from the EVA resin.

In addition, in the EVA composition for solar cell encapsulation according to the present invention, in addition to the above components, additives commonly used in the EVA composition for solar cell encapsulation, for example, an additive such as a flame retardant, may be blended in a usual amount of use. .

According to the EVA composition for solar cell encapsulation according to the present invention, a sheet having a higher crosslinking efficiency and less yellowing is used as compared with the case where the first and second crosslinking agents are used alone or the second crosslinking agent is used in an amount greater than the range of the present invention. This can be prepared because the minor addition of the secondary crosslinker synergizes with the primary crosslinker to allow the primary crosslinker to achieve a sufficient degree of crosslinking, thereby reducing the minimum required requirement of the total crosslinker to less than 1 part by weight. In addition, an appropriate crosslinking aid may be added for such a synergistic effect, whereby the synergistic effect may be further enhanced. Therefore, according to the EVA composition for solar cell sealing materials which concerns on this invention, productivity can be improved, without impairing the physical property of EVA sheet.

1 is a graph showing the degree of crosslinking (%) of the EVA sheet of the embodiment.
Figure 2 is a graph showing the change in the yellowing value with time of the comparative example and the example.

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to these examples.

[ Example  One]

To 100 parts by weight of EVA (manufacturer: Samsung Total) having a melt index of 10 g / 10 minutes and a vinyl acetate content of 28% by weight, t-butyl-2-ethylhexyl monofer as a primary crosslinking agent in the composition ratio shown in Table 1 below. Oxycarbonate (trade name: Luperox TBEC, manufactured by Alkema) 0.5 part by weight, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane as a secondary crosslinker (trade name: Luperox 101, manufactured by Alkema ) 0.025 part by weight, triallyl isocyanurate as a crosslinking aid (trade name: TAIC, manufacturer: Evonik) 0.5 part by weight, 2-hydroxy-4-octyloxy-benzophenone (trade name: Chimassorb 81, manufacturer as UV absorber) : Ciba) 0.2 part by weight, 0.1 parts by weight of bis-2,2,6,6, -tetramethyl-4-piperidinyl sebacate (trade name: Tinuvin 770, manufacturer: Ciba) as a UV stabilizer, as a silane coupling agent 0.3 parts by weight of γ-methacryloxypropyltrimethoxysilane (trade name: OFS 6030, manufactured by Dow Corning) was mixed.

 Thereafter, the sheet was prepared through an extruder, the extruder temperature and the T-die temperature was maintained at 100 ℃, the production linear speed of the sheet was maintained at 2.5m / min. The thickness of the sheet produced was 0.5 mm.

The prepared sheet was subjected to crosslinking (5 minutes and 10 minutes) in a mold at a pressure of 6 bar at 150 ° C. using a hot press to measure the degree of crosslinking. The crosslinking degree of the crosslinked sheet was measured by adding 0.3 g of the crosslinked sample to 100 ml of xylene, boiling for 2 hours, insoluble in the mesh after cooling at room temperature for 4 hours, and weighing after drying for 4 hours. The results are shown in Table 1 and FIG.

The prepared sheet was put between the low iron glass and the back sheet (trade name: PV-FS Z-68 manufactured by DNP, Japan), and vacuum lamination was performed to prepare a sample for measuring yellowing. Lamination conditions were carried out in two steps, the first step was carried out for 6 minutes at 150 ℃, the same degree of vacuum up and down, in the second step was carried out for 11 minutes at 150 ℃, 50KPa upper and lower pressure difference. The yellow index (YI: Yellow Index) prepared sample was measured by Hunter Lab., UltraScan PRO Colorimeter (Hunter Lab., UltraScan PRO Colorimeter) after measuring the initial yellowing (YI), UV corn (ATLAS, 60 degrees) , 340 nm) and measured the YI value after 500 hours and 1000 hours, respectively. The measurement results are shown in Table 2.

[ Example  2]

A sheet was prepared in the same manner as in Example 1 except that 0.05 parts by weight of Luperox 101, which was a secondary crosslinking agent, was crosslinked under the same conditions to prepare a specimen.

[ Comparative example  One]

A sheet was prepared in the same manner as in Example 1, except that 0.1 part by weight of Luperox 101, which was a secondary crosslinking agent, was crosslinked under the same conditions to prepare a specimen.

[ Comparative example  2]

A sheet was prepared in the same manner as in Example 1 except that 0.2 parts by weight of Luperox 101, a secondary crosslinking agent, was used and crosslinked under the same conditions to prepare a specimen.

[ Comparative example  3]

A sheet was prepared in the same manner as in Example 1, except that Luperox 101, a secondary crosslinking agent, was used, and the UV absorber Chimassorb 81 was increased to 0.3 parts by weight, and crosslinked under the same conditions to prepare a specimen.

[ Comparative example  4]

The sheet was manufactured in the same manner as in Example 1, except that Luperox 101, the second crosslinking agent, was used in an amount of 1.0 parts by weight of Luperox TBEC, the first crosslinking agent, and 0.3 parts by weight of the UV absorber Chimassorb 81 was added. Then, crosslinking was performed under the same conditions to prepare a specimen.

Secondary cross-link
(L-101) Primary cross-link
(TBEC) Crosslinking agent
Total amount Secondary crosslinking ratio 5 minutes
Degree of crosslinking (%) 10 minutes
Degree of crosslinking (%) Example 1 0.025 0.5 0.525 5% 24.1 86 Example 2 0.05 0.5 0.55 9% 60.4 88.3 Comparative Example 1 0.1 0.5 0.6 17% 69.5 87.3 Comparative Example 2 0.2 0.5 0.7 29% 71.2 89.5 Comparative Example 3 0 0.5 0.5 0% 21.1 76.5 Comparative Example 4 0 1.0 1.0 0% 79.1 89.1

In Table 1, the 5-minute crosslinking degree of Example 1 and Example 2 according to the present invention, in which Luperox 101, which is a secondary crosslinking agent, was used within a range of 0.02 to 0.05 parts by weight, was significantly higher than that of Comparative Example 3, in which the secondary crosslinking agent was not added. It can be seen that increased. On the other hand, when the secondary crosslinking agent is used at 0.05 parts by weight or more from the results of Comparative Examples 1 and 2, it can be seen that the effect of further increasing the degree of crosslinking is not great. In addition, as can be seen in Comparative Example 3, when using only Luperox TBEC as the primary crosslinking agent alone, the crosslinking degree of 5 minutes is very low, and it can be seen that the target crosslinking degree of 80% is not achieved even at 10 minutes of crosslinking. Comparative Example 4 indicates that when the secondary crosslinking agent is not used, the primary crosslinking agent should be used in an amount of 1 part by weight, which is twice that of Example 1, in order to achieve a level of crosslinking level equivalent to that of the present invention.

Therefore, by using the secondary crosslinking agent in the scope of the present invention from the results of the above table, the crosslinking time can be reduced in comparison with the comparative examples in the embodiments according to the present invention, the action of the primary crosslinking agent (TBEC) is maximized The amount can be lowered from the existing 1 to 1.5 parts by weight to 0.5 parts by weight, which has the advantage of minimizing the amount of peroxide remaining in the sheet and the amount of gas generated during crosslinking.

Table 2 below shows the yellowness index (YI: Yellow Index) according to the content of the secondary crosslinking agent and the additive of each sample.

Secondary
Crosslinking agent Primary
Crosslinking agent Secondary crosslinking ratio UV
Absorbent YI_0 YI_500 YI_1000 Example 1 0.025 0.5 5% 0.2 1.70 3.22 3.98 Example 2 0.05 0.5 9% 0.2 1.68 3.28 3.97 Comparative Example 1 0.1 0.5 17% 0.2 1.72 3.16 4.27 Comparative Example 2 0.2 0.5 29% 0.2 1.85 3.27 4.76 Comparative Example 3 0 0.5 0% 0.3 1.87 3.86 3.81 Comparative Example 4 0 1.0 0% 0.3 1.74 3.73 6.91

Referring to Table 2, Examples 1 and 2 according to the present invention have a lower increase in YI value than Comparative Examples 1 and 2, and 1000 hours YI (YI_1000) equivalent to that of Comparative Example 3 in which UV absorbers were used in an increased amount. It can be seen that the value was maintained.

In Comparative Example 4, even though the same amount of UV absorber was added in the same amount as that of Comparative Example 3, the YI increased significantly. This is because Comparative Example 4 increased the amount of the primary crosslinking agent by 1.0 parts by weight compared to Comparative Example 3.

From the results of Tables 1 and 2 above, the embodiments according to the present invention reduce the primary crosslinking agent (TBEC) content, which has a great effect on yellowing, by 50%, while maintaining the level of the existing commercial product in terms of the degree of crosslinking. It can be seen that.

Claims (10)

A primary crosslinking agent selected from at least one selected from peroxyketal having a half-life temperature of 110 to 120 ° C and peroxycarbonate having a one-hour half-life temperature of 90 to 130 ° C with respect to 100 parts by weight of ethylene vinyl acetate copolymer resin. A composition for solar cell encapsulation material comprising 0.5 to 0.8 parts by weight, and containing at least one secondary crosslinking agent selected from dialkyl peroxides having a half-life temperature of 130 to 150 ° C. for 1 hour.
The composition of claim 1, wherein the ethylene vinyl acetate copolymer resin has a vinyl acetate content of 25 to 35% by weight and a melt index of 6 to 30 g / 10 minutes.
The method of claim 1, wherein the peroxyketal is t-butyl-2-ethylhexyl monoperoxycarbonate, 1,1-di (t-amylperoxy) cyclohex
Acid, 1,1-di (t-butylperoxy) -3,3,5-trimethylcyclohexane and 1,1-di (t-butylperoxy) cyclohexane,
The peroxycarbonate is 2,5-dimethyl-2,5-di- (2-ethylhexanoylperoxy) hexane, t-amylperoxy-2-ethylhexanoate
, t-butylperoxy-2-ethylhexanoate, t-amyl (2-ethylhexyl) monoperoxycarbonate, t-butylisopropyl monoperoxy
Carbonate, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, t-butyl- (2-ethylhexyl) monoperoxycarbonate, t-amylperoxy
Benzoate, tertiarybutylperoxyacetate, t-butylperoxy-3,5,5-trimethylhexanoate and t-butylperoxybenzo
The composition for solar cell sealing material characterized by the above-mentioned.
The method of claim 1, wherein the dialkyl peroxide is dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, α, α'-di (t-butylperoxy) di Solar cell, characterized in that selected from isopropylbenzene, di-t-amyl peroxide, di-t-butylperoxide and 2,5-dimethyl-2,5-di (t-butylperoxy) hexyn-3 Composition for encapsulant.
The composition for solar cell encapsulation according to claim 1, further comprising at least one selected from a crosslinking aid, an antioxidant, a UV absorber, a UV stabilizer, and a silane coupling agent.
The method of claim 5, wherein the crosslinking aid, triallyl isocyanurate, triallyl cyanurate, diallyl phthalate, diallyl fumarate, diallyl maleate, ethylene glycol diacrylate, ethylene glycol dimethacrylate And at least one selected from trimethylolpropane trimethacrylate.
The antioxidant according to claim 5, wherein the antioxidant is tetrakis (methylene (3,5-di-t-butyl-4-hydroxyhydrocinnamic acid)) methane, 3,5-di-t-butyl-4-hydrate A composition for solar cell encapsulating materials, characterized in that it is at least one selected from oxyhydrocinnamate octadecyl, tris (2,4-di-t-butylphenyl) phosphite and tris (nonylphenyl) phosphite.
The said UV absorber is 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2'-carboxybenzophenone, and 2-hydroxy-4-octyloxybenzo. Phenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-hydroxy-4-n-octadecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2-hydroxy-4 -Methoxy-5-sulfobenzophenone, 2-hydroxy-5-chlorobenzophenone, 2,4-dihydroxybenzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2 A composition for solar cell encapsulation materials, characterized in that it is at least one selected from '-dihydroxy-4,4'-dimethoxybenzophenone and 2,2', 4,4'-tetrahydroxybenzophenone.
6. The UV stabilizer according to claim 5, wherein the UV stabilizer is bis-2,2,6,6, -tetramethyl-4-piperidinyl sebacate, bis-1-methyl-2,2,6,6, -tetramethyl -4-piperidinyl sebacate, 2 (2'-hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole and 2- (2-hydroxy-3,5-di-t- A composition for solar cell encapsulant, wherein the composition is at least one member selected from amylphenyl) -2H-benzotriazole.
The silane coupling agent according to claim 5, wherein the silane coupling agent is γ-methacryloxypropyltrimethoxysilane, N- (β-aminoethyl) -γaminopropyltrimethoxysilane, N- (β-aminoethyl) -γ- The composition for solar cell sealing materials characterized by at least 1 type selected from aminopropyl methyl dimethoxysilane, (gamma) -aminopropyl triethoxysilane, and (gamma)-glycidoxy propyl trimethoxysilane.

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