KR101314371B1

KR101314371B1 - Encapsulant

Info

Publication number: KR101314371B1
Application number: KR1020100106966A
Authority: KR
Inventors: 서범두; 채훈; 이충훈; 최성호; 이은정
Original assignee: 주식회사 엘지화학
Priority date: 2010-10-29
Filing date: 2010-10-29
Publication date: 2013-10-14
Also published as: KR20120045434A

Abstract

The present invention relates to a filler. The filler of the present invention can be effectively used, for example, as a filler for various optoelectronic devices.

Description

Filler {ENCAPSULANT}

The present invention relates to a filler.

The filling material encapsulates a light emitting portion or a light detecting portion in an optoelectronic device such as a photovoltaic cell, an LED (Light Emitting Diode) or an OLED (Organic Light Emitting Diode) Can be used.

For example, a solar cell module is usually manufactured by a lamination method in which elements such as a transparent front substrate, a filler, a photovoltaic element, and a backsheet are laminated according to a desired structure, and the produced laminate is heated and pressed &Lt; / RTI >

EVA (ethylene-vinyl acetate) resin is most widely used as a filler used in a solar cell module in terms of processability, workability and cost.

However, the EVA resin is contained in an optoelectronic device such as a front substrate or a backsheet, and has a low bonding strength with an element in contact with the filler. Therefore, when the optoelectronic device is exposed to the outside for a long time, there is a problem that peeling easily occurs between the layers. Further, the EVA resin is pyrolyzed in a heat pressing process or the like to generate toxic gas such as acetic acid gas. Such toxic gases deteriorate the working environment, adversely affect the photovoltaic elements or electrodes contained in the module, deteriorate the module and lower the power generation efficiency.

An object of the present invention is to provide a filler.

The present invention includes an olefin resin having a hydrolyzable group or a reactive group which is a hydrolyzate of the hydrolyzable group, and a hydrolysis catalyst, wherein the gel fraction measured in accordance with ASTM D 2765 after 18 hours in hot water at 90 ° C. It relates to a filler which is 5% to 60%.

Hereinafter, the filler of the present invention will be described more specifically.

In one example, the filler may be used to encapsulate devices included in optoelectronic devices, such as photovoltaic cells, LEDs or OLEDs. However, the use to which the filler of the present invention is applied is not limited to the above.

The filler may be prepared by using a composition prepared by combining a olefin resin having a hydrolyzable group introduced into the main chain, side chain, or terminal, or grafted with a monomer having a hydrolyzable group, with a hydrolysis catalyst. . In the above, the olefin resin means a polymer comprising at least one olefin as polymerized units, wherein the polymer is a homopolymer which is a homogeneous polymer made from a single monomer; And copolymers comprising chemically different segments or blocks, whether produced by the reaction of two or more different monomers or formed from a single monomer. In addition, in this specification, the olefin resin in which the hydrolysable group is introduce | transduced as mentioned above can be called "modified olefin resin."

The filler was gelled by staying in hot water at 90 ° C. for 18 hours, and the gel fraction measured according to ASTM D 2765 was 5% to 60%, preferably 5% to 55%, more preferably 10% to 50%, more preferably 20% to 50%. By adjusting the gel fraction of the filler in the above range, the crosslinking structure of the filler is appropriately adjusted, and thus, for example, when the filler of the present invention is applied to an optoelectronic device, the components of the device, for example, a substrate, etc. It can be made to exhibit high adhesion.

In the present invention, the crosslinking structure of the filler may be controlled by controlling the degree to which the hydrolyzable group is hydrolyzed and converted into a reactive group in the process of preparing the filler using a composition including the olefin resin into which the hydrolyzable group is introduced and a hydrolysis catalyst. Can be. The term "reactive group" as used herein means that when the filler of the present invention is applied to an optoelectronic device, the filler can have a physical or chemical interaction with a functional group present on the contact surface of the element of the optoelectronic device in direct contact. It means a functional group. For example, a glass substrate is a representative element in direct contact when a filler is applied to an optoelectronic device. In this case, when the reactive functional group is a hydroxy group, a physical bond such as a hydroxy group and a hydrogen bond, which are functional groups also present on the glass substrate; Or a chemical covalent bond through a condensation reaction or the like, thereby improving the adhesion.

The gel fraction for the filler is measured in the manner described in the Examples below.

In the present invention, the type of hydrolyzable group included in the olefin resin in the filler is not particularly limited as long as it can generate a reactive group through a hydrolysis reaction. For example, the hydrolyzable group may be a halogen atom, an alkoxy group, an aryloxy group, an acyloxy group, an alkylthio group or an alkyleneoxythio group. In this case, examples of the halogen atom include chlorine (Cl). Examples of the alkoxy group include an alkoxy group having 1 to 20 carbon atoms, 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms, Examples of the aryloxy group include an aryloxy group having 6 to 18 carbon atoms and a carbon number of 6 to 12, and may be, for example, phenoxy. Examples of the acyloxy group include an acyloxy group having 1 to 12 carbon atoms, Examples of alkylthio groups include alkylthio groups having 1 to 12 carbon atoms, and examples of alkyleneoxy groups include alkyleneoxy groups having 1 to 12 carbon atoms. In the present invention, the hydrolyzable group may preferably be alkoxy, specifically, an alkoxy group having 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms, more preferably 1 to 4 carbon atoms, for example, methoxide. It may be a period, an ethoxy group, a propoxy group, an isopropoxy group or a butoxy group, Preferably it may be a methoxy group or an ethoxy group. In addition, in this invention, the kind of reactive group is determined according to the kind of hydrolysable group used, Although it does not restrict | limit especially, It is preferable that it is a hydroxyl group.

In the present invention, the type of the olefin resin that can provide the above hydrolyzable group to the filler is not particularly limited, but may be, for example, a silane-modified olefin resin. Such olefin resins are, for example, mixed with α-olefins, unsaturated silane compounds and other copolymerizable monomers, if necessary, and simultaneously or stepwise in the presence of a suitable radical polymerization initiator and a chain transfer agent, if necessary. It can be prepared by copolymerizing with. According to another example, the silane-modified olefin resin may be prepared by mixing an olefin resin and an unsaturated silane compound and grafting the unsaturated silane compound to the olefin resin in the presence of a suitable radical generator.

That is, the olefin resin included in the filler of the present invention, for example, a copolymer comprising an α-olefin and an unsaturated silane compound represented by the following formula (1) in copolymerized form; Alternatively, the olefin resin may be a graft polymer grafted with an unsaturated silane compound represented by Formula 1 below.

[Formula 1]

DSi (X) _m Y _(3-m)

In Formula 1, D represents alkenyl bonded to a silicon atom, X represents a hydrolyzable group bonded to a silicon atom, Y represents a non-hydrolyzable group bonded to a silicon atom, and m represents an integer of 1 to 3. Indicates.

In Formula 1, the alkenyl group may be, for example, a vinyl group, an allyl group, a propenyl group, an isopropenyl group, a butenyl group, a hexenyl group, a cyclohexenyl group, an octenyl group, or the like, and preferably a vinyl group. have.

In addition, in Chemical Formula 1, X may be a hydrolyzable group as described above. In addition, examples of the non-hydrolyzable moiety represented by Chemical Formula 1 include hydrogen, an alkyl group, an aryl group, an aralkyl group, and the like. In the above, the alkyl group may be, for example, an alkyl group having 1 to 12 carbon atoms, 1 to 8 carbon atoms or 1 to 4 carbon atoms. In addition, the aryl group may be an aryl group having 6 to 12 carbon atoms, for example, a phenyl group, and the aralkyl group may be an aralkyl having 7 to 12 carbon atoms, for example, a benzyl group. In addition, in Formula 1, m is a number of 1 to 3, preferably 2 or 3, more preferably 3 may be.

Specific examples of the unsaturated silane compound of the formula (1) include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltripropoxysilane, vinyltriisopropoxysilane, vinyltributoxysilane, vinyltripentoxysilane, Silane, and vinyltriacetoxysilane. Of these, vinyltrimethoxysilane or vinyltriethoxysilane is preferably used, but not limited thereto.

In addition, examples of the α-olefin which is included in the copolymerized form in the copolymer or may form an olefin resin of the graft polymer include ethylene, propylene, 1-butene, isobutylene, 1-pentene, and 2-methyl. -1-butene, 3-methyl-1-butene, 1-hexene, 1-heptane, 1-octene, 1-nonene or 1-decene may be one or more than one, or more preferably, ethylene, but is not limited thereto. It doesn't happen.

In the present invention, the olefin resin is 0.1 parts by weight to 10.0 parts by weight of the unsaturated silane compound as described above with respect to 100 parts by weight of the α-olefin in the case of a copolymer, and 100 parts by weight of the olefin resin in the case of a graft polymer. Preferably from 0.5 part by weight to 5.0 parts by weight. Unless otherwise specified, unit weight parts herein means weight ratios. It is possible to maintain excellent adhesion of the filler in this range.

The olefin resin included in the filler of the present invention may preferably be a graft polymer obtained by grafting an unsaturated silane compound of Formula 1 to an olefin resin. The olefin resin in the above may preferably be polyethylene. The term " polyethylene " includes not only a homopolymer of ethylene but also at least 50 mol% or more of ethylene as a polymerization unit, and also includes an? -Olefin having three or more carbon atoms or other comonomers Copolymers may also be included. The polyethylene may be, for example, one or more of low density polyethylene, medium density polyethylene, high density polyethylene, ultra low density polyethylene, ultralow low density polyethylene or linear low density polyethylene.

In the present invention, it is preferable to use polyethylene having many side chains as the unsaturated silane compound grafted. In the case of polyethylene having many side chains, grafting can be performed more efficiently. Usually, polyethylene with many side chains is low in density, and polyethylene with few side chains is high in density. That is, in the present invention, it is preferable to use a low density polyethylene. Specifically, the density is 0.85 g / cm ³ to 0.96 g / cm ³ , preferably the density is about 0.85 g / cm ³ to 0.92 g / cm ³ Polyethylene can be used.

In addition, the polyethylene has a melt flow rate (MFR) of about 0.1 g / 10 minutes to about 50 g / 10 minutes, preferably about 1.0 g / 10 minutes to 50.0 g / 10 minutes, more preferably at 190 ° C. About 1.0 g / 10 minutes to 30.0 g / 10 minutes. When having the MFR in this range, for example, the filler of the present invention can exhibit excellent moldability and adhesion.

The filler of the present invention further includes a hydrolysis catalyst for controlling the crosslinking structure. The specific kind of hydrolysis catalyst that can be used in the present invention is not particularly limited, and general organic metal catalysts, organic acid catalysts or basic hydrolysis catalysts known in the art can be used, and preferably basic hydrolysis catalysts can be used. Can be. In the case of a basic hydrolysis catalyst, it is preferable at the point which can adjust suitably the degree of hydrolysis, and can minimize the bad influence to the other components contained in a filler.

In the present invention, the specific type of the basic hydrolysis catalyst is not particularly limited and includes, for example, organic amine compounds, heterocyclic compounds containing a nitrogen atom as a ring constituent atom, metal hydroxides or metal amides Or more. Examples of the organic amine compound may include alkylamine or dialkylamine, and specifically, alkylamine or dialkylamine having an alkyl group having 1 to 12 carbon atoms, 1 to 8 carbon atoms, or 1 to 4 carbon atoms. More specifically, ethylamine, hexylamine, n-propylamine or dibutylamine. The heterocyclic compound described above is a hydrocarbon ring compound containing nitrogen as a ring-constituting hetero atom, and specific examples thereof include pyridine. In addition, examples of the metal hydroxide is an example of NaOH, KOH, RbOH, or and the like CsOH, metal amide, NaNH _2, KNH _2, RbNH but are ₂ or CsNH ₂ or the like, without being limited thereto. In the present invention, it is preferable to use an organic amine compound, preferably an alkyl amine having an alkyl group having 1 to 20 carbon atoms or a dialkyl amine having an alkyl group having 2 to 40 carbon atoms in the catalyst.

The filler of the present invention may include a hydrolysis catalyst in an amount of 0.005 parts by weight to 5 parts by weight, preferably 0.05 parts by weight to 2 parts by weight, based on 100 parts by weight of the olefin resin. By controlling the physical properties of the overall filler at such a weight ratio, it is possible to increase the adhesion to the substrate, and also maintain excellent activity of additives such as UV stabilizers.

The filler of the present invention may further include one or more additives selected from light stabilizers, UV absorbers, heat stabilizers, and the like as necessary.

The light stabilizer can serve to prevent photooxidation by capturing the active species of initiation of photo-initiation of the olefin resin, depending on the application to which the filler of the present invention is applied. The kind of light stabilizer that can be used in the present invention is not particularly limited, and for example, a known compound such as a hindered amine compound or a hindered piperidine compound can be used.

In addition, the UV absorber may play a role of absorbing ultraviolet rays from sunlight or the like, converting them into harmless thermal energy in the molecule, and preventing the active species of photodegradation initiation in the olefin resin depending on the use of the filler. Can be. The specific kind of UV absorber that can be used in the present invention is not particularly limited and includes, for example, benzophenone, benzotriazole, acrylonitrile, metal complex salt, hindered amine, ultrafine titanium oxide, Inorganic UV absorbers and the like, or a mixture of two or more of them may be used.

In addition, examples of the heat stabilizer that can be used include tris (2,4-di-tert-butylphenyl) phosphite and bis [2,4-bis (1,1-dimethylethyl) -6-methylphenyl] ethyl ester phosphorous acid , Tetrakis (2,4-di-tert-butylphenyl) [1,1-biphenyl] -4,4'-diylbisphosphonate and bis (2,4-di-tert-butylphenyl) pentaerythritoldipo Phosphorus thermal stabilizers such as spikes; Hydroxy-5,7-di-tert-butyl-furan-2-one and o-xylene, and the like.

In the filler of the present invention, the content of the light stabilizer, UV absorber and / or heat stabilizer is not particularly limited. That is, the content of the additive may be appropriately selected in consideration of the use of the filler, the shape or density of the additive, etc., and may be appropriately adjusted within the range of 0.01 wt% to 5 wt% in the filler.

The filler may, in addition to the above components, appropriately further include various additives known in the art, depending on the application applied.

In the present invention, the shape of the filler as described above is not particularly limited, and may be, for example, sheet or film. In this case, the film thickness of the filler can be adjusted to about 10 μm to 2,000 μm, preferably about 100 μm to 1250 μm, in consideration of the element's support efficiency and the possibility of breakage, the weight reduction and workability of the device, and the like. However, the film thickness of the filler may be changed depending on the specific use applied.

The method for producing the filler in the present invention is not particularly limited. For example, the filler may include preparing a resin composition including an olefin resin having a hydrolyzable group introduced therein and a hydrolysis catalyst in a reactor; And it may be prepared by a method comprising the step of molding the composition into a film or sheet shape.

The method for preparing the olefin resin into which the hydrolyzable group is introduced in the reactor and further mixing with the hydrolysis catalyst to produce the composition is not particularly limited. For example, the composition may be prepared by mixing the? -Olefin, the unsaturated silane compound as described above and, if necessary, other copolymerizable monomers in a molten state in a reactor and heating the mixture at a predetermined temperature and under pressure to a suitable radical polymerization initiator , Optionally in the presence of a chain transfer agent, to produce a modified resin, and adding additives such as a hydrolysis catalyst before, during, or after the production of the resin. The above-mentioned resin composition can be obtained by, for example, mixing an olefin resin and an unsaturated silane compound as described above in a heated molten state in a reactor and heating the unsaturated silane compound to an olefin resin in the presence of a suitable radical- Followed by grafting to produce a modified resin, followed by mixing with an additive such as a hydrolysis catalyst.

In one example, the method for producing the resin composition comprises: mixing an olefin resin, a silane compound of Formula 2 and a radical generator in a reactor, and grafting the silane compound to an olefin resin; And introducing a hydrolysis catalyst into the same reactor, and mixing the same.

The type of the reactor in which the olefin resin is produced is not particularly limited as long as it can produce a desired resin by reacting reactants in a heat-fused or liquid state. For example, the reactor may be an extruder or a cylinder. In the case of using such a reactor, for example, a liquid silane compound and a radical generator are added to a heat-melted olefin resin through an extruder and extruded, or an olefin resin, a radical generator and a silane compound are mixed in a hopper. After the addition, the mixture may be heated and melted in a cylinder to react to prepare an olefin resin.

In the above method, as described above, the hydrolysis catalyst can be introduced into or before the formation of the olefin resin into the reactor in which the olefin resin is produced. In this case, the hydrolysis catalyst as well as the ultraviolet absorber, the heat stabilizer or the light stabilizer can be introduced. Other additives, such as these, can also be added together. Thus, by simultaneously performing the production of the olefin resin and mixing with the additive in one reactor, the process can be simplified.

The hydrolysis catalyst and / or other additives may be introduced into the reactor as it is, or may be added in the form of a master batch and mixed. In the above, the master batch refers to a pellet-shaped raw material in which the additives to be added are concentrated and dispersed at a high concentration, and in particular, in processing and molding plastic raw materials by extrusion or injection method, a specific function is applied to the finished product. Used to introduce additives.

The method for introducing an additive such as a hydrolysis catalyst into the reactor in which the olefin resin is formed is not particularly limited. For example, a side feeder may be installed at an appropriate position of the extruder or the cylinder, A method of adding an additive in the form of a master batch, or a method of mixing the mixture with an olefin resin or the like in a hopper and inputting the mixture.

In the above method, the conditions such as the specific kind and design of the reactor, the heating and melting, the mixing or the reaction and the conditions such as the time and the kind, the kind of the radical generator and the production method of the master batch are not particularly limited, Can be appropriately selected.

In addition, the method of molding the obtained composition into a sheet or film shape after the above process is not particularly limited, and for example, a conventional filming or sheeting process such as a T die process or an extrusion may be used. In the above method, it is preferable to carry out the in-situ process using an apparatus in which the above-described manufacturing process of the resin composition and the film-forming or sheet-forming process are connected to each other.

The invention also relates to an optoelectronic device comprising an optoelectronic device encapsulated by the filler of the invention described above.

The optoelectronic device encapsulated in the present invention may be, for example, a light emitting or photosensitive site such as a photovoltaic cell, an LED or an OLED.

In the present invention, the specific structure of the optoelectronic device and the method of encapsulating the optoelectronic device using the filler of the present invention is not particularly limited, and the present invention may be applied in a manner and structure commonly applied in the field according to the device.

For example, when the optoelectronic device is a photovoltaic cell in the present invention, the optoelectronic device, as shown in Fig. 1 or 2, the light receiving substrates 11 and 21, the back sheet 12 and 22 and the light receiving substrate 11 , 21 and a solar cell comprising photovoltaic elements 13, 23 encapsulated by fillers 14 (a), 14 (b), 24 according to the invention between the back sheets 12, 22. It may be a module (1, 2).

The specific types of the light receiving substrate, the back sheet, and the photovoltaic device are not particularly limited. For example, the light receiving substrate may include 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, and the back sheet may be a composite sheet comprising a metal such as aluminum, a fluororesin sheet, a weather resistant film and a barrier film. In addition, the photovoltaic device may be, for example, a thin film active layer formed by a silicon wafer-based active layer or chemical vapor deposition (CVD).

In the present invention, the above-described optoelectronic device may be manufactured by, for example, producing a laminate using a substrate, an optoelectronic device, and a filler of the present invention; And it can be produced by a method comprising the step of heat compression while vacuum suction the prepared laminate.

In the present invention, the method of manufacturing the laminate using the substrate, the optoelectronic device and the filler and the stacking order of each layer in the laminate are not particularly limited, and in view of the structure of the desired optoelectronic device, You may use the method normally applied. In addition, the method of the above-mentioned hot pressing process is not particularly limited, and an appropriate method according to the optoelectronic device can be selected.

For example, the above-described solar cell module may be manufactured by laminating a light receiving substrate, a filler, a photovoltaic device, a back sheet, and the like according to a desired structure, and then heating and compressing the same as a single body with vacuum suction.

In addition, the conditions of the heat compression process in the above, can be carried out for 5 minutes to 60 minutes, preferably 8 minutes to 40 minutes at a temperature of 90 ℃ to 230 ℃, preferably 110 ℃ to 190 ℃.

The filler of the present invention can be effectively used, for example, as a filler material for various optoelectronic devices.

1 and 2 are cross-sectional views illustrating a solar cell module which is an optoelectronic device according to one example of the present invention.

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

Example 1

Manufacture of fillers

98 parts by weight of polyethylene, 2 parts by weight of vinyl trimethoxy silane and 0.1 parts by weight of radical generator (dicumyl peroxide) having a density of 0.880 g / cm ³ and a MFR of 5 g / 10 min at 190 ° C. were mixed in an extruder, The mixture was heated and stirred at 200 ° C to graf the vinyl trimethoxy silane to the polyethylene. Further, 100 parts by weight of a linear low density polyethylene having a density of 0.870 g / cm ³ , 4 parts by weight of a hindered amine light stabilizer, 2 parts by weight of a benzophenone ultraviolet absorber, 2 parts by weight of a phosphorus- 1 part by weight of dodecylamine (C ₁₂ H ₂₅ NH ₂ ) was melted and processed into a pelletized master batch was fed into the extruder at a rate of about 5 to 10 parts by weight using a side feeder to prepare a vinyl trimethoxysilane Were mixed with the grafted polyethylene to prepare a resin composition. Subsequently, the resin composition was fed into a side hopper of a film forming machine having a twin-screw extruder (27 mm) and a T die (width: 500 mm) and processed at an extrusion temperature of 200 캜 and a take-off speed of 3 m / In-sheet filler was processed.

Manufacture of photovoltaic modules

Plate glass having a thickness of about 3 mm, the filler prepared above, the crystalline silicon wafer photovoltaic device, the filler prepared and the back sheet (thickness: polyvinyl fluoride sheet (thickness: 38 μm), aluminum foil (thickness: 30 μm) and poly A laminated sheet of vinyl fluoride sheet (thickness: 38 µm) was laminated in this order, and pressed in a vacuum laminator at 150 ° C. for 15 minutes to prepare a photovoltaic module.

Example 2

A filler and a module were prepared in the same manner as in Example 1 except that 1 part by weight of butylamine (C ₄ H ₉ NH ₂ ) was used as a hydrolysis catalyst in the preparation of the masterbatch.

Comparative Example 1

A filler and a photovoltaic module were prepared in the same manner as in Example 1, except that 1 part by weight of DBTDL (dibutyl dilaurate) as an organic metal catalyst was used instead of the basic hydrolysis catalyst in the preparation of the masterbatch.

Comparative Example 2

Fillers and photovoltaic modules were prepared in a manner according to Example 1, except that no hydrolysis catalyst was used in the preparation of the master batch.

<Measurement of properties>

1. FT-IR analysis

FT-IR analysis was performed on the prepared filler using an FT-IR analyzer (FTS 3000, BIO-RAD). The peak derived from the stretching motion of the methoxy group of methoxysilyl (Si-OCH ₃ ), which is a hydrolyzable group introduced into the olefin resin, was observed at 1091 cm ^-1 in the spectrum derived after the analysis, and the hydrolyzable group was hydrolyzed A peak due to the stretching motion of the hydroxy group of the resulting reactive group (Si-OH) was observed at 3645 cm ^-1 . Accordingly, by substituting the intensity of the peak observed in the intensity of the peak 1091 (intensity) observed in cm ^-1, 720 cm-1 peak intensity, and 3645 cm ^-1 as measured in the in the general formula 1 and 2, respectively , Hydrolyzable group and reactive group index were determined.

[Formula 1]

Hydrolyzable group index = (peak intensity at 1091 cm ^-1 ) / (peak intensity at 720 cm ^-1 )

[Formula 2]

Reactive group index = (peak intensity at 3645 cm ^-1 ) / (peak intensity at 720 cm ^-1 )

2. Measurement of Peel Strength

The specimens were prepared by cutting the prepared filler to 15 m × 200 m (width × length). Subsequently, the test piece was bonded to a plate glass used as a front substrate of a photovoltaic module for 10 minutes under a condition of 150 mm in a vacuum laminator (manufactured by Meier (trade name: ICOLAM)). Then, the peeling force was measured using a tensile tester (manufacturer: Lloyd, trade name: LEPlus) while peeling the adhered filler at a peel rate of 50 mm / min and a peel angle of 90 degrees.

3. Measurement of gel fraction

The prepared filler was cut to a size of 10 mm x 10 mm (width x length) to prepare a specimen. Thereafter, the specimen was gelled by immersing it in hot water at 90 ° C. for 18 hours, and the gel fraction of the filler was measured according to the contents specified in ASTM D-2765.

The results of the analysis are summarized in Table 1 below.

FT-IR Peel strength
(N / 15mm) Gel fraction
(weight%) Reactive factor index Hydrolyzable group index Example 1 0.08 0.12 210 44 Example 2 0.05 0.16 180 27 Comparative Example 1 0.12 0.06 20 81 Comparative Example 2 0.00 0.20 50 2

As can be seen from the results of Table 1, in the case of the filler of the embodiment, it showed a high peel strength with respect to the glass substrate frequently used as a substrate in the solar cell module. On the other hand, in the case of Comparative Example 1 in which the gel fraction is too high, the content of the reactive group in the filler is excessively increased, it can be seen that it is not easy to properly control the physical properties. In addition, in the case of the comparative example 2 in which the gel fraction is too low, it can confirm that peeling strength with respect to a board | substrate falls significantly.

1, 2: Solar cell module
11, 21: light receiving substrate
12, 22: photovoltaic device
13, 23: back sheet
14 (a), 14 (b), 24: filler

Claims

An olefin resin having a hydrolyzable group or a reactive group which is a hydrolyzate of the hydrolyzable group, and a hydrolysis catalyst, wherein the gel fraction measured according to ASTM D 2765 after staying in hot water at 90 ° C. for 18 hours is 5% to 60%. Filler being%.

The filler of claim 1 wherein the gel fraction is 10% to 50%.

The filler according to claim 1, wherein the hydrolyzable group is a halogen atom, an alkoxy group, an aryloxy group, an acyloxy group, an alkylthio group or an alkyleneoxythio group.

The filler according to claim 1, wherein the hydrolyzable group is an alkoxy group having 1 to 12 carbon atoms.

The filler according to claim 1, wherein the reactive group is a hydroxy group.

The method of claim 1, wherein the olefin resin is a copolymer comprising an α-olefin and an unsaturated silane compound of formula (1) in copolymerized form; Or a filler that is a graft polymer grafted with an unsaturated silane compound represented by Formula 1 to an olefin resin:
[Formula 1]
DSi (X) _m Y _(3-m)
In Formula 1, D represents alkenyl bonded to a silicon atom, X is bonded to a silicon atom, and a halogen atom, an alkoxy group, an aryloxy group, an acyloxy group, an alkylthio group or an alkyleneoxythio group Or the above hydrolyzate, Y is bonded to a silicon atom, represents hydrogen, an alkyl group, an aryl group or an aralkyl group, and m represents an integer of 1 to 3.

The filler of claim 1 wherein the olefin resin is a graft polymer grafted with an unsaturated silane compound of formula (1) to polyethylene:
[Formula 1]
DSi (X) _m Y _(3-m)
In Formula 1, D, X, Y and m are as defined in claim 6.

The filler according to claim 7, wherein the polyethylene has a density of 0.85 g / cm ³ to 0.96 g / cm ³ .

8. The filler of claim 7, wherein the polyethylene has an MFR of from 0.1 g / 10 minutes to 50 g / 10 minutes at 190 ° C.

The filler according to claim 1, wherein the hydrolysis catalyst is an organic amine compound, a heterocyclic compound containing a nitrogen atom as a ring constituent atom, a metal hydroxide or a metal amide.

The filler according to claim 1, wherein the hydrolysis catalyst is alkylamine or dialkylamine.

The filler according to claim 1, wherein the filler comprises 0.005 parts by weight to 5 parts by weight with respect to 100 parts by weight of the olefin resin.

The filler according to claim 1, further comprising at least one kind selected from the group consisting of a light stabilizer, a UV absorber, and a heat stabilizer.

An optoelectronic device comprising an optoelectronic device encapsulated with the filler of claim 1.