KR102594265B1 - Method for manufacturing non-pellet synthetic resin solar cell encapsulant film and non-pellet synthetic resin solar cell encapsulant film manufactured therefrom - Google Patents

Abstract

The present invention is a method for producing a non-pellet synthetic resin solar cell encapsulant film in which the synthetic resin used as a solar cell encapsulant is not manufactured into pellets, but is dispersed using two kneaders and a continuous film process is performed to produce the solar cell encapsulant film. and a pellet-free synthetic resin solar cell encapsulant film manufactured therefrom.
Since the pellet-free synthetic resin solar cell encapsulant film manufacturing method of the present invention and the pellet-free synthetic resin solar cell encapsulant film produced therefrom do not go through the pellet process, the crosslinking agent by the heat input during the pellet manufacturing process and forming the film with pellets is used. Since segregation does not occur, the manufactured film has increased permeability, fisheyes are almost non-existent, so the film has a beautiful appearance, and the manufactured pellet-free synthetic resin solar cell encapsulant film has remarkable moisture barrier properties, making it ideal for solar cell encapsulation. It can be used as ashes.

Description

Method for manufacturing pellet-free synthetic resin solar cell encapsulation film and pellet-free synthetic resin solar cell encapsulation film manufactured therefrom }

The present invention relates to a method for manufacturing a pellet-free synthetic resin solar cell encapsulant film and a pellet-free synthetic resin solar cell encapsulant film produced therefrom. More specifically, the present invention relates to a method for manufacturing a pellet-free synthetic resin solar cell encapsulant film, and more specifically, to a method for producing a pellet-free synthetic resin solar cell encapsulant film. The present invention relates to a method for manufacturing a pellet-free synthetic resin solar cell encapsulant film, which produces a solar cell encapsulant film by dispersing it with two kneaders and performing a continuous film process, and to a pellet-free synthetic resin solar cell encapsulant film manufactured therefrom. .

The solar power industry is expected to grow at an average annual growth rate of 14.3%, and global solar power demand is expected to exceed 180GW in 2021 due to the full-fledged emergence of climate change and ESG issues, and the era of 200GW is expected to open in 2022.

The solar cells that lead the solar energy industry require solar cell encapsulation materials that secure moisture barrier properties and physically surround the solar cell module.

In general, the solar cell encapsulation material has been using EVA (ethylene vinyl acetate) resin, but when the EVA (ethylene vinyl acetate) resin is exposed to high temperature and high humidity, acetic acid is generated due to moisture, causing a problem that corrodes the battery.

In addition, the solar cell encapsulant is manufactured in a two-step process of producing pellets by applying heat to a masterbatch of EVA (ethylene vinyl acetate) resin, and then applying heat to the pellets to produce a solar cell encapsulant film.

Figure 1 is a process diagram for manufacturing a solar cell encapsulant film through a pellet process according to the prior art.

Referring to Figure 1, after mixing the raw materials for the solar cell encapsulation film, manufacturing them into pellets, cooling/drying, and then forming the film in a discontinuous process in a separate extrusion equipment, the film could only be manufactured by forming pellets. I was able to.

In addition, in the method of manufacturing a solar cell encapsulant film through the pellet process of FIG. 1, when a solid crosslinking agent is used by applying heat to each step of producing a solar cell encapsulant film by applying heat to the pellet manufacturing step and the pellet. Segregation of the cross-linking agent occurs, and when a liquid cross-linking agent is used, a problem occurs in that the resin immersion time is long.

Therefore, through painstaking efforts and experiments, the present applicant has demonstrated moisture barrier properties even under high temperature and high humidity conditions, and by omitting the pellet process, process stability is secured even when using a solid or liquid crosslinking agent, The present invention was completed by obtaining a method for manufacturing a pellet-free synthetic resin solar cell encapsulant film in which the process time is shortened by a continuous process using in-line extrusion equipment and a pellet-free synthetic resin solar cell encapsulant film manufactured therefrom.

In the present invention, when making pellets, the resin immersion time by the liquid cross-linking agent is long, and the solar cell encapsulating film process time is shortened by performing a continuous process of non-pellet synthetic resin solar cell encapsulant film that fundamentally blocks the occurrence of segregation by the solid cross-linking agent. A method of manufacturing a pellet-free synthetic resin solar cell encapsulant film that is applied as a solar cell encapsulant by significantly improving the moisture barrier properties of the pellet-free synthetic resin solar cell encapsulant film and the pellet-free synthetic resin solar cell manufactured therefrom The purpose is to provide a battery encapsulation film.

The method of manufacturing a pellet-free synthetic resin solar cell encapsulant film according to an embodiment of the present invention is

A method of manufacturing a solar cell encapsulant film by dispersing the synthetic resin used as a solar cell encapsulant into pellets without dispersing it with two kneaders and performing a continuous film process,

Injecting a film mixture including synthetic resin, cross-linking agent, cross-linking aid, coupling agent, UV absorber, and UV stabilizer into two kneaders, Kneader 1 and Kneader 2, using a screw feeder;

Kneading the film mixture added to the kneader 1 for 3 minutes to 2 hours at a temperature of 70 to 150 ° C.;

When the film mixture of the kneader 1 is exhausted, performing a continuous process of adding the film mixture of the kneader 2 to the kneader 1 and kneading for 3 minutes to 2 hours at a temperature of 70 to 150 ° C.; and

The kneaded film mixture from the kneader 1 is supplied to the main twin feeder connected to a T-die extruder or a calendar extruder maintained at a temperature of 70 to 150 ℃ to produce the T-die ( It may include the step of extruding a non-pellet synthetic resin solar cell encapsulant film through a T-die) extruder or the calendar extruder.

The synthetic resin according to an embodiment of the present invention is

It may be polyolefin resin or ethylene vinyl acetate copolymer (EVA) resin.

The polyolefin resin according to an embodiment of the present invention may be a polyolefin elastomer (POE) resin or a polyolefin plastomer (POP) resin.

The polyolefin resin according to an embodiment of the present invention may be an ethylene·α-olefin copolymer or a propylene·α-olefin copolymer.

The ethylene/α-olefin copolymer according to an embodiment of the present invention includes ethylene and an α-olefin having 3 to 20 carbon atoms,

The content of the structural unit derived from ethylene may be 60 to 85 mol%, and the content of the structural unit derived from the α-olefin having 3 to 20 carbon atoms may be 15 to 40 mol%.

The propylene/α-olefin copolymer according to an embodiment of the present invention includes propylene and an α-olefin having 3 to 20 carbon atoms,

The content of structural units derived from propylene may be 60 to 85 mol%, and the content of structural units derived from the α-olefin having 3 to 20 carbon atoms may be 15 to 40 mol%.

The polyolefin resin according to an embodiment of the present invention includes ethylene-butene copolymer (EBR)-based polyolefin elastomer resin, ethylene-hexene copolymer (EHR)-based polyolefin elastomer resin, and ethylene-octene copolymer (EOR)-based polyolefin elastomer resin. , propylene-butene copolymer (PBR) based polyolefin elastomer resin, propylene-hexene copolymer (PHR) based polyolefin elastomer resin, propylene-octene copolymer (POR) based polyolefin elastomer resin, ethylene-butene copolymer (EBR) based polyolefin. Plastomer resin, ethylene-hexene copolymer (EHR)-based polyolefin plastomer resin, ethylene-octene copolymer (EOR)-based polyolefin plastomer resin, propylene-butene copolymer (PBR)-based polyolefin plastomer resin, It may be a propylene-hexene copolymer (PHR)-based polyolefin plastomer resin, or a propylene-octene copolymer (POR)-based polyolefin plastomer resin.

The crosslinking agent according to an embodiment of the present invention is

Dicumyl peroxide, benzoyl peroxide, lauryl peroxide, t-butyl cumyl peroxide, di(t-butylperoxyisopropyl)benzene, 2,5-dimethyl-2,5-di(t-butyl peroxy) )hexane, di-t-butylperoxide, 1,1-bis(t-butylperoxy)-3,3,5-trimethyl cyclohexane, 1,1-bis(t-butylperoxy)cyclohexane, t -Butylperoxy maleic acid, t-butylperoxy-3,3,5-trimethylhexanoate, cyclohexanone peroxide, t-butylperoxy aryl carbonate, t-butylperoxy isopropyl carbonate, 2,5 -Dimethyl-2,5-di(benzoylperoxy)hexane, 2,2-bis(t-butylperoxy)octane, t-butylperoxy acetate, 2,2-bis(t-butylperoxy)butane, t-butylperoxybenzoate, n-butyl-4,4-bis(t-butylperoxybutylperoxy)valerate, di-t-butylperoxy isophthalate, methyl ethyl ketone peroxide, α,α' -One or more can be selected from the group consisting of bis(t-butylperoxy-m-isopropyl)benzene, di-isopropylbenzene hydroperoxide, di-t-butyl peroxide, and 2,5-dimethyl-2.

The crosslinking aid according to an embodiment of the present invention is Triallyl isocyanurate (TAIC), Triallyl cyanurate (TAC), Trimethylopropane Trimethacrylate (TMPTMA), Trimethylopropane Triacrylate (TMPTA), 1,2-polybutadiene (HVPBD), Ethylene Glycol Dimethacrylate (EGDMA) ), Ethylene Glycol Diacrylate (EGDA), N,N'-1,3-Phenylene dimaleimide (PDM), Zinc diacrylate (ZDA), Zinc dimethacrylate (ZDMA), 90% Vinyl polybutadiene (HVPBd), 70% Vinyl styrene butadiene copolymer (HVSBR), Tributyl isocyanurate, Tributyl cyanurate, Tripropyl isocyanurate, Tripropyl cyanurate, Benzyl isocyanurate, and Benzyl cyanurate.

The coupling agent according to an embodiment of the present invention

One or more may be selected from the group consisting of vinyl trimethoxy silane, octamethyl cyclotetrasiloxane, 3-Methacryloxypropyl methyldimethoxysilane, 3-Methacryloxypropyl trimetoxysilane, 3-Methacryloxypropyl trietoxysilane, 3-Methacryloxypropyl methyldiethoxysilane, and Acryloxypropyl trimetoxysilane.

The UV absorber according to an embodiment of the present invention

2-Hydroxy-4-octyloxy Benzophenone, Benzophenone, 2-Hydroxy-4-methoxybenzophenone, 2,2'-Dihydroxy-4,4'-dimethyoxybenzophenone, 2-(2-hydroxy-3,5-di(1,1- dimethylbenzyl)phenyl)2H-benzotriazole, 2-(2-Hydroxy-5-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-ditert-butyl)benzotriazole, 2-3(3-tert-butyl -2-hydroxy-5-methylpheny)-5-chlorobenzotriazole, 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-di-tert -amylphenyl)benzotriazole, 2-(2-Hydroxy-5-t-octylphenyl)-benzotriazole, Bis-(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, Methyl 1,2,2,6 ,6-pentamethyl-4-piperidinyl sebacate, 2,2'-Thiobis(4-t-octylphenolato)-n-butylamine nickel II, Reaction products of methyl 3-(3-(2H-benzotriazole-2 -yl)-5 -t-butyl-4-hydroxy phenyl) propionate / PEG 300, Ethyl-2-cyano-3,3-diphenylacrylate, (2-ethylhexyl)-2-cyano-3,3-diphenylacrylate, and N,N'-bisformyl One or more may be selected from the group consisting of -N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-hexamethylendiamine.

The UV stabilizer according to an embodiment of the present invention

Bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, Bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate, 2-(2H-benzotriazol-2-yl)- 4-(tert-butyl)-6-(sec-butyl) phenol, 2-(2H-benzotriazol-2-yl)-4-(tert-butyl)-6-(sec-butyl) phenol, Dimethyl succinate polymer with 4-hydroxy-2,2,6,6-tetromethyl-1-piperidine ethanol, Poly{[6-[1,3,3-tetramethylbutyl]amino]-1,3,5-triazine-2,4-diyl} [2,2,6,6-tetramethyl-4-piperidinyl]imino]}, N,N'-bisformyl-N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-hexamethylendiamine , and Decanedioic acid, bis(2,2,6,6-tetramethyl-1-(octyloxy)-4-piperidinyl)ester.

The film mixture according to one embodiment of the present invention further includes an antioxidant,

The antioxidant may be a phenol-based antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, or an amine-based antioxidant.

The pellet-free synthetic resin solar cell encapsulation film according to an embodiment of the present invention may be formed of 1 to 5 layers.

The light transmittance of the pellet-free synthetic resin solar cell encapsulation film according to an embodiment of the present invention may be 80% to 98%.

The Yellow Index (YI) of the pellet-free synthetic resin solar cell encapsulant film according to an embodiment of the present invention may be 1.0 to 10.0.

The moisture absorption rate of the pellet-free synthetic resin solar cell encapsulation film according to an embodiment of the present invention may be 0% to 1.2%.

The moisture barrier property (WVTR) of the pellet-free synthetic resin solar cell encapsulation film according to an embodiment of the present invention is 10 ^-4 based on a temperature of 38 ° C, a relative humidity of 100%, and a film thickness of 1 mil (25.4 μm). It may be g/m ² ·day to 30 g/m ² ·day.

It is possible to provide a pellet-free synthetic resin solar cell encapsulant film manufactured by the pellet-free synthetic resin solar cell encapsulant film manufacturing method according to an embodiment of the present invention.

The moisture barrier property (WVTR) of the pellet-free synthetic resin solar cell encapsulation film according to an embodiment of the present invention is 10 ^-4 based on a temperature of 38 ° C, a relative humidity of 100%, and a film thickness of 1 mil (25.4 μm). It may be g/m ² ·day to 30 g/m ² ·day.

Since the pellet-free synthetic resin solar cell encapsulation film manufacturing method of the present invention does not go through a pellet process, segregation of the cross-linking agent due to heat input during the pellet manufacturing process and pellet film forming does not occur, and the produced film has increased transmittance. , Fish eyes rarely occur, giving the film a beautiful appearance.

In addition, the pellet-free synthetic resin solar cell encapsulant film produced by the method for manufacturing the non-pellet synthetic resin solar cell encapsulant film of the present invention has remarkable moisture barrier properties and can be used as a solar cell encapsulant.

In addition, the pellet-free synthetic resin solar cell encapsulant film manufacturing method of the present invention and the pellet-free synthetic resin solar cell encapsulant film produced therefrom are manufactured through a film extrusion process that can be implemented in large areas, making it economical and easy to produce repeatedly. And, the process time is shortened and the production yield is high due to the continuous process using in-line extrusion equipment.

Figure 1 is a process diagram for manufacturing a solar cell encapsulant film through a pellet process according to the prior art.
Figure 2 is a process diagram for manufacturing a pellet-free synthetic resin solar cell encapsulant film according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail through examples. Since these examples are merely for illustrating the present invention, the scope of the present invention is not to be construed as limited by these examples.

Expressions such as “comprising” used in this specification are understood as open-ended terms that imply the possibility of including other embodiments, unless specifically stated otherwise in the phrase or sentence containing the expression. It has to be.

As used herein, “preferred” and “preferably” refer to embodiments of the invention that may provide certain advantages under certain circumstances. However, under the same or different circumstances, other embodiments may also be preferred. Additionally, mention of one or more preferred embodiments does not mean that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.

Manufacturing method of pellet-free synthetic resin solar cell encapsulation film

The present invention is a method of manufacturing a solar cell encapsulant film by dispersing the synthetic resin used as a solar cell encapsulant into pellets, rather than dispersing it with two kneaders, and performing a continuous film process,

Injecting a film mixture including synthetic resin, cross-linking agent, cross-linking aid, coupling agent, UV absorber, and UV stabilizer into two kneaders, Kneader 1 and Kneader 2, using a screw feeder;

Kneading the film mixture added to the kneader 1 for 3 minutes to 2 hours at a temperature of 70 to 150 ° C.;

When the film mixture of the kneader 1 is exhausted, performing a continuous process of adding the film mixture of the kneader 2 to the kneader 1 and kneading for 3 minutes to 2 hours at a temperature of 70 to 150 ° C.; and

The kneaded film mixture from the kneader 1 is supplied to the main twin feeder connected to a T-die extruder or a calendar extruder maintained at a temperature of 70 to 150 ℃ to produce the T-die ( It includes the step of extruding a non-pellet synthetic resin solar cell encapsulant film through a T-die extruder or the calendar extruder.

Here, the pellet-free synthetic resin solar cell encapsulation film manufacturing method of the present invention does not go through a pellet process, so segregation of the crosslinking agent does not occur due to the heat input during the pellet manufacturing process and forming the film with pellets, so the manufactured film has low transmittance. The film has a beautiful appearance as there are almost no fish eyes.

In addition, the pellet-free synthetic resin solar cell encapsulant film produced by the method for manufacturing the non-pellet synthetic resin solar cell encapsulant film of the present invention has remarkable moisture barrier properties and can be used as a solar cell encapsulant.

In addition, the pellet-free synthetic resin solar cell encapsulant film manufacturing method of the present invention and the pellet-free synthetic resin solar cell encapsulant film produced therefrom are manufactured through a film extrusion process that can be implemented in large areas, making it economical and easy to produce repeatedly. And, the process time is shortened and the production yield is high due to the continuous process using in-line extrusion equipment.

In other words, the method for manufacturing the pellet-free synthetic resin solar cell encapsulation film of the present invention has very excellent manufacturing efficiency.

In addition, the pellet-free synthetic resin solar cell encapsulant film manufacturing method of the present invention and the pellet-free synthetic resin solar cell encapsulant film produced therefrom are dispersed with a kneader with good dispersing power and do not form pellets, so the heat to process the film with pellets Since this is not necessary, the resin immersion time due to the liquid cross-linking agent that occurs when making pellets according to the prior art is long, and the occurrence of segregation due to the solid cross-linking agent can be fundamentally prevented.

In addition, the present invention can dramatically improve the solar cell encapsulant film process time by performing a continuous process for the non-pellet synthetic resin solar cell encapsulant film.

That is, the two kneaders are placed in succession, and after going through a kneading process in one kneader, the film is extruded by a film extruder, and the film mixture from the other kneader is input into the first kneader, goes through a raw material dispersion process, and is then produced into a T-die. ) A continuous process of film extrusion can be performed using an extruder or calender extruder.

In addition, the pellet-free synthetic resin solar cell encapsulant film manufacturing method of the present invention can produce a solar cell encapsulant film using a double kneader continuous film extruder without a dipping process and a masterbatch process.

Here, the method for manufacturing the non-pellet synthetic resin solar cell encapsulation film of the present invention does not perform a crosslinking agent immersion process.

In addition, the moisture barrier property of the pellet-free synthetic resin solar cell encapsulation film is significantly increased, so it can be applied as a solar cell encapsulation material.

In addition, the kneader is equipment suitable for kneading and mixing paste-like high-viscosity materials (resin, rubber, cement, pigment, clay, powder, etc.), capable of cooling, high-temperature heating, and vacuum. This is a dispersing equipment that facilitates uniform mixing and grinding using blades applied to high-viscosity work samples.

Here, kneading the film mixture added to the kneader 1 for 3 minutes to 2 hours at a temperature of 70 to 150 ° C.

When the film mixture of Kneader 1 is exhausted, the film mixture of Kneader 2 is input into Kneader 1 and a continuous process of kneading is performed at a temperature of 70 to 150 ° C. for 3 minutes to 2 hours, and then kneaded in each of the two kneaders. The film mixture can be kneaded.

In addition, the T-die extruder is an extruder having a T-shaped die and is equipment that produces a film by contacting molten resin on the surface of a cooled polishing roll (Chiller Roll).

Here, the kneaded film mixture from the kneader 1 is supplied to the main twin feeder connected to the T-die extruder maintained at a temperature of 70 to 150 ° C to produce the T-die at a temperature of 60 to 130 ° C. A pellet-free synthetic resin solar cell encapsulation film can be extruded through an extruder.

Additionally, the calender extruder is equipment that kneads the mixture between 3 to 4 rolling rolls and then extrudes it to a certain thickness to produce a film.

Here, the kneaded film mixture from the kneader 1 is supplied to the main twin feeder connected to the calender extruder maintained at a temperature of 70 to 150 ° C, and pellet-free synthesis is performed through the calender extruder at a temperature of 60 to 130 ° C. Resin solar cell encapsulation film can be extruded.

In addition, the synthetic resin is

It may be polyolefin resin or ethylene vinyl acetate copolymer (EVA) resin.

Additionally, the polyolefin resin may be a polyolefin elastomer (POE) resin or a polyolefin plastomer (POP) resin.

Additionally, the polyolefin resin may be an ethylene·α-olefin copolymer or a propylene·α-olefin copolymer.

Here, the ethylene/α-olefin copolymer includes ethylene and an α-olefin having 3 to 20 carbon atoms,

The content of the structural unit derived from ethylene may be 60 to 85 mol%, and the content of the structural unit derived from the α-olefin having 3 to 20 carbon atoms may be 15 to 40 mol%.

In addition, the propylene/α-olefin copolymer includes propylene and an α-olefin having 3 to 20 carbon atoms,

The content of structural units derived from propylene may be 60 to 85 mol%, and the content of structural units derived from the α-olefin having 3 to 20 carbon atoms may be 15 to 40 mol%.

In addition, the polyolefin resin includes ethylene-butene copolymer (EBR)-based polyolefin elastomer resin, ethylene-hexene copolymer (EHR)-based polyolefin elastomer resin, ethylene-octene copolymer (EOR)-based polyolefin elastomer resin, and propylene-butene copolymer. (PBR) based polyolefin elastomer resin, propylene-hexene copolymer (PHR) based polyolefin elastomer resin, propylene-octene copolymer (POR) based polyolefin elastomer resin, ethylene-butene copolymer (EBR) based polyolefin plastomer resin, ethylene -Hexene copolymer (EHR) based polyolefin plastomer resin, ethylene-octene copolymer (EOR) based polyolefin plastomer resin, propylene-butene copolymer (PBR) based polyolefin plastomer resin, propylene-hexene copolymer ( It may be a PHR)-based polyolefin plastomer resin, or a propylene-octene copolymer (POR)-based polyolefin plastomer resin.

And, the cross-linking agent is

Dicumyl peroxide, benzoyl peroxide, lauryl peroxide, t-butyl cumyl peroxide, di(t-butylperoxyisopropyl)benzene, 2,5-dimethyl-2,5-di(t-butyl peroxy) )hexane, di-t-butylperoxide, 1,1-bis(t-butylperoxy)-3,3,5-trimethyl cyclohexane, 1,1-bis(t-butylperoxy)cyclohexane, t -Butylperoxy maleic acid, t-butylperoxy-3,3,5-trimethylhexanoate, cyclohexanone peroxide, t-butylperoxy aryl carbonate, t-butylperoxy isopropyl carbonate, 2,5 -Dimethyl-2,5-di(benzoylperoxy)hexane, 2,2-bis(t-butylperoxy)octane, t-butylperoxy acetate, 2,2-bis(t-butylperoxy)butane, t-butylperoxybenzoate, n-butyl-4,4-bis(t-butylperoxybutylperoxy)valerate, di-t-butylperoxy isophthalate, methyl ethyl ketone peroxide, α,α' -One or more can be selected from the group consisting of bis(t-butylperoxy-m-isopropyl)benzene, di-isopropylbenzene hydroperoxide, di-t-butyl peroxide, and 2,5-dimethyl-2.

In addition, the cross-linking aids include Triallyl isocyanurate (TAIC), Triallyl cyanurate (TAC), Trimethylopropane Trimethacrylate (TMPTMA), Trimethylopropane Triacrylate (TMPTA), 1,2-polybutadiene (HVPBD), Ethylene Glycol Dimethacrylate (EGDMA), and Ethylene Glycol Diacrylate ( EGDA), N,N'-1,3-Phenylene dimaleimide (PDM), Zinc diacrylate (ZDA), Zinc dimethacrylate (ZDMA), 90% Vinyl polybutadiene (HVPBd), 70% Vinyl styrene butadiene copolymer (HVSBR), Tributyl isocyanurate , Tributyl cyanurate, Tripropyl isocyanurate, Tripropyl cyanurate, Benzyl isocyanurate, and Benzyl cyanurate.

Here, the coupling agent

One or more may be selected from the group consisting of vinyl trimethoxy silane, octamethyl cyclotetrasiloxane, 3-Methacryloxypropyl methyldimethoxysilane, 3-Methacryloxypropyl trimetoxysilane, 3-Methacryloxypropyl trietoxysilane, 3-Methacryloxypropyl methyldiethoxysilane, and Acryloxypropyl trimetoxysilane.

And, the UV absorber is

2-Hydroxy-4-octyloxy Benzophenone, Benzophenone, 2-Hydroxy-4-methoxybenzophenone, 2,2'-Dihydroxy-4,4'-dimethyoxybenzophenone, 2-(2-hydroxy-3,5-di(1,1- dimethylbenzyl)phenyl)2H-benzotriazole, 2-(2-Hydroxy-5-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-ditert-butyl)benzotriazole, 2-3(3-tert-butyl -2-hydroxy-5-methylpheny)-5-chlorobenzotriazole, 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-di-tert -amylphenyl)benzotriazole, 2-(2-Hydroxy-5-t-octylphenyl)-benzotriazole, Bis-(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, Methyl 1,2,2,6 ,6-pentamethyl-4-piperidinyl sebacate, 2,2'-Thiobis(4-t-octylphenolato)-n-butylamine nickel II, Reaction products of methyl 3-(3-(2H-benzotriazole-2 -yl)-5 -t-butyl-4-hydroxy phenyl) propionate / PEG 300, Ethyl-2-cyano-3,3-diphenylacrylate, (2-ethylhexyl)-2-cyano-3,3-diphenylacrylate, and N,N'-bisformyl One or more may be selected from the group consisting of -N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-hexamethylendiamine.

In addition, the UV stabilizer is

Bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, Bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate, 2-(2H-benzotriazol-2-yl)- 4-(tert-butyl)-6-(sec-butyl) phenol, 2-(2H-benzotriazol-2-yl)-4-(tert-butyl)-6-(sec-butyl) phenol, Dimethyl succinate polymer with 4-hydroxy-2,2,6,6-tetromethyl-1-piperidine ethanol, Poly{[6-[1,3,3-tetramethylbutyl]amino]-1,3,5-triazine-2,4-diyl} [2,2,6,6-tetramethyl-4-piperidinyl]imino]}, N,N'-bisformyl-N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-hexamethylendiamine , and Decanedioic acid, bis(2,2,6,6-tetramethyl-1-(octyloxy)-4-piperidinyl)ester.

In addition, the film mixture contains 0.1 to 3.0 wt% of the crosslinking agent, 0.1 to 3.0 wt% of the crosslinking agent, 0.1 to 3.0 wt% of the coupling agent, 0.05 to 0.5 wt% of the UV absorber, and It may contain 0.01 to 0.5% by weight of UV stabilizer.

At this time, the film mixture preferably contains 0.5 to 2.0% by weight of the crosslinking agent, 0.5 to 2.0% by weight of the crosslinking aid, 0.5 to 2.0% by weight of the coupling agent, and 0.1 to 0.3% by weight of the UV absorber, based on 100 weight of the synthetic resin. %, and 0.05 to 0.15 wt% of UV stabilizer.

In addition, the film mixture further includes an antioxidant,

The antioxidant may be a phenol-based antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, or an amine-based antioxidant.

Here, the antioxidant may contain 0.1 to 3.0% by weight based on 100 weight of the synthetic resin.

At this time, the antioxidant may preferably contain 0.5 to 2.0% by weight based on 100 weight of the synthetic resin.

In addition, the pellet-free synthetic resin solar cell encapsulation film may be formed of 1 to 5 layers.

At this time, the pellet-free synthetic resin solar cell encapsulation film may preferably be formed of 1 to 4 layers, and more preferably may be formed of 1 to 3 layers.

Additionally, the light transmittance of the pellet-free synthetic resin solar cell encapsulation film may be 80% to 98%.

At this time, the light transmittance of the pellet-free synthetic resin solar cell encapsulation film may be preferably 82% to 96%, and more preferably 85% to 95%.

Here, the Yellow Index (YI) of the pellet-free synthetic resin solar cell encapsulation film may be 1.0 to 10.0.

At this time, the Yellow Index (YI) of the pellet-free synthetic resin solar cell encapsulation film may preferably be 1.5 to 9.8, and more preferably 2.0 to 9.5.

In addition, the moisture absorption rate of the pellet-free synthetic resin solar cell encapsulation film may be 0% to 1.2%.

At this time, the moisture absorption rate of the pellet-free synthetic resin solar cell encapsulation film may be preferably 0% to 1.1%, and more preferably 0% to 1.0%.

In addition, the moisture barrier property (WVTR) of the pellet-free synthetic resin solar cell encapsulation film is 10 ^-4 g/m ² ·day based on measurement of a temperature of 38 ℃, a relative humidity of 100%, and a film thickness of 1 mil (25.4 μm). It may be from 30 g/m ² ·day.

At this time, the moisture barrier property (WVTR) of the pellet-free synthetic ^resin solar cell encapsulation film is ⁵ It may be from 25 g/m ² ·day, and more preferably from 2X10 ^-4 g/m ² ·day to 20 g/m ² ·day.

Additionally, the density of the pellet-free synthetic resin solar cell encapsulation film may be 0.85 to 0.9 g/cm ³ and the melt index (MI) may be 2 to 22 g/10min.

In addition, the backsheet adhesion of the pellet-free synthetic resin solar cell encapsulation film can be significantly improved by introducing the coupling agent.

In addition, in the pellet-free synthetic resin solar cell encapsulation film, fish eyes may be found insignificantly or hardly at all.

In addition, the pellet-free synthetic resin solar cell encapsulation film may have a damp heat of 94% to 99%.

Here, the Damp heat is a standard for module mass production quality, and is an accelerated life evaluation that is left for 1,000 hours in a chamber with a temperature/humidity of 85 ℃ and 85%, and the power amount before and after is compared, and the evaluation standard of KS C 61215 Measure according to .

Figure 2 is a process diagram for manufacturing a pellet-free synthetic resin solar cell encapsulant film according to an embodiment of the present invention.

Referring to Figure 2, the manufacturing method of the pellet-free synthetic resin solar cell encapsulation film has the advantage that mixing of raw film components and film molding can be carried out simultaneously in a single facility, greatly shortening the production process and time. can,

In an exemplary embodiment, supplying raw film components as raw materials to a batch-type kneader through a raw material feeder; And it may include the step of dispersing (kneading) the supplied film components as raw materials in two or more batch-type kneaders to form a film mixture.

Here, the film components may include a synthetic resin, a cross-linking agent, a cross-linking aid, a coupling agent, a UV absorber, and a UV stabilizer that constitute the film mixture.

Then, it is a continuous process in which the film mixture, in which the raw materials have been dispersed in the batch-type kneader, are alternately fed into the main feeder to form a film.

In an exemplary embodiment, the manufacturing method includes transferring the film mixture that has been kneaded in the first batch kneader to a conveyor and feeding it into the main feeder; simultaneously conveying the film mixture in the first batch kneader and kneading the film components in the second batch kneader to form a film mixture; At the point when the film mixture transfer of the first batch kneader machine ends, the film mixture for which the raw material dispersion has been completed in the second batch kneader machine is transferred to the conveyor and fed into the main feeder; And the process of dispersing the film components as raw materials in the first batch-type kneader may be repeated while transferring the film mixture in the second batch-type kneader.

For example, the film mixture for which raw material dispersion has been completed in the first batch-type kneader is transferred to the basket conveyor and supplied to the main twin feeder, and when the film mixture is transferred to the first batch-type kneader, the film components are also transferred to the second batch-type kneader. Dispersion of the raw materials proceeds to form a film mixture, and at the end of the transfer of the film mixture of the first batch kneader machine, transfer of the film mixture of the second batch kneader machine proceeds. In addition, at the same time as the transfer of the film mixture from the second batch kneader machine, the raw material dispersion of the film components proceeds in the first batch kneader machine to form a film mixture, and the transfer of the film mixture from the second batch kneader machine is completed. Then, the process of transferring the film mixture from the first batch type kneader is repeated.

Manufacturing of the pellet-free solar cell encapsulation film of FIG. 2 can be carried out through continuous operation in a single process. Specifically, the film components are supplied through a feeder, dispersed through two or more batch-type kneaders to form a film mixture, and then continuously transported through a basket conveyor. While dispersion of one batch is completed within a certain period of time and the dispersed film mixture is transferred to the screw, dispersion of another batch proceeds in the kneader, thereby maintaining a continuous process.

Finally, the film mixture transferred to the conveyor is transferred to a T-die through a feeder and a skewer, and can be manufactured into a film form through the T-die.

Alternatively, the film mixture transferred to the conveyor may be transferred to a rolling roll through a feeder and a skewer and manufactured into a film form through a calendaring process passing between the rolling rolls.

Pellet-free synthetic resin solar cell encapsulation film

The present invention can provide a pellet-free synthetic resin solar cell encapsulant film manufactured by the above pellet-free synthetic resin solar cell encapsulant film manufacturing method.

Here, the moisture barrier property (WVTR) of the pellet-free synthetic resin solar cell encapsulation film is 10 ^-4 g/m ² ·day based on measurement of a temperature of 38°C, a relative humidity of 100%, and a film thickness of 1 mil (25.4 μm). It may be from 30 g/m ² ·day.

At this time, the moisture barrier property (WVTR) of the pellet-free synthetic ^resin solar cell encapsulation film is ⁵ It may be from 25 g/m ² ·day, and more preferably from 2X10 ^-4 g/m ² ·day to 20 g/m ² ·day.

Additionally, the density of the pellet-free synthetic resin solar cell encapsulation film may be 0.85 to 0.9 g/cm ³ and the melt index (MI) may be 2 to 22 g/10min.

In addition, the backsheet adhesion of the pellet-free synthetic resin solar cell encapsulation film can be significantly improved by introducing a silane coupling agent.

Here, the pellet-free synthetic resin solar cell encapsulation film may be formed of 1 to 5 layers.

At this time, the pellet-free synthetic resin solar cell encapsulation film may preferably be formed of 1 to 4 layers, and more preferably may be formed of 1 to 3 layers.

Additionally, the light transmittance of the pellet-free synthetic resin solar cell encapsulation film may be 80% to 98%.

At this time, the light transmittance of the pellet-free synthetic resin solar cell encapsulation film may be preferably 82% to 96%, and more preferably 85% to 95%.

Here, the Yellow Index (YI) of the pellet-free synthetic resin solar cell encapsulation film may be 1.0 to 10.0.

At this time, the Yellow Index (YI) of the pellet-free synthetic resin solar cell encapsulation film may preferably be 1.5 to 9.8, and more preferably 2.0 to 9.5.

In addition, the moisture absorption rate of the pellet-free synthetic resin solar cell encapsulation film may be 0% to 1.2%.

At this time, the moisture absorption rate of the pellet-free synthetic resin solar cell encapsulation film may be preferably 0% to 1.1%, and more preferably 0% to 1.0%.

In addition, in the pellet-free synthetic resin solar cell encapsulation film, fish eyes may be found insignificantly or hardly at all.

In addition, the pellet-free synthetic resin solar cell encapsulation film may have a damp heat of 94% to 99%.

Hereinafter, the present invention will be described in more detail through examples. The scope of the present invention is not to be construed as limited by these examples.

<Synthesis example> Polyolefin elastomer production

When synthesizing polyolefin elastomer (POE), the amount of siloxane added as a blocking agent was used at less than 100 ppm, the amount of hydrotalcite as a residual catalyst remover (killing agent) was used at less than 10 ppm, and the residual chloride ion (Chloride) was used at less than 100 ppm. ppm or less, and was a manufactured EBR or EOR based polyolefin resin. At this time, the melt index (MI) was 1 to 30, and the density was 0.80 to 0.95.

<Example 1> Manufacturing of pellet-free solar cell encapsulation film

To manufacture a pellet-free solar cell encapsulant film, 100 wt% of EBR-based POE resin, 1 wt% of 2,2,5-Bis(tert-butylperoxy)-2,5-dimethylhexane, a liquid peroxide, and cross-linking aid. Trially 1 wt% of isocyanurate, 1 wt% of vinyl trimethoxy silane as a coupling agent, 0.2 wt% of 2-hydroxyl-4-(octyloxy)benzophenone as a UV absorber, and bis(2,2,6,6-) as a UV stabilizer. A film mixture was prepared using tetramethyl-4-piperidyl)sebacate at a ratio of 0.1 wt%.

To manufacture a pellet-free solar cell encapsulant film, the film mixture was supplied to two kneaders using a screw feeder using the double kneader continuous film extruder of Figure 2, kneaded at 100 ° C. for more than 10 minutes, and then kneaded by one kneader. The kneaded film mixture was supplied to the main twin feeder maintained at a temperature of 100 ° C. and extruded using a T-die film extruder at a temperature of 90 ° C. to produce a pellet-free solar cell encapsulation film.

When the film mixture from the supplied kneader was exhausted, the film mixture from another kneader was added and kneaded by adding the same film mixture to the used kneader to proceed as a continuous process.

The physical properties of the pellet-free solar cell encapsulation film of Example 1 are listed in Table 1 below.

<Example 2> Manufacturing of pellet-free solar cell encapsulation film

A film mixture was prepared in the same manner as in Example 1 except that 1 wt% of Dicumyl peroxid, a solid peroxide, was applied as a crosslinking agent, and a pellet-free solar cell encapsulation film was manufactured using the same film extrusion method.

The physical properties of the pellet-free solar cell encapsulation film of Example 2 are listed in Table 1 below.

<Comparative Example 1> Manufacture of pellet solar cell encapsulation film

The film mixture was prepared in the same way as Example 1.

For impregnation of liquid peroxide, the mixture was mixed in a stirring tank at 30°C and soaked for 1 hour, then dried to prepare pellets containing additives. The pellets were put into a twin-screw T-die film extruder with a cylinder temperature of 100°C and the film was extruded at a die temperature of 90°C to produce a pellet solar cell encapsulation film.

The physical properties of the pellet solar cell encapsulation film of Comparative Example 1 are listed in Table 1 below.

<Comparative Example 2> Manufacturing of pellet solar cell encapsulation film

The film mixture was prepared in the same way as Example 2.

Since the film extrusion used a solid cross-linking agent, except for the cross-linking agent immersion process in Comparative Example 1, the film mixture was put into a Twin Screw Extruder and stirred at 100 ° C. Pellets were prepared and dried to add additives. Containing pellets were prepared. A pellet solar cell encapsulation film was manufactured by extruding the pellets using a two-screw T-die film extruder with a cylinder temperature of 100°C.

The physical properties of the pellet solar cell encapsulation film of Comparative Example 2 are listed in Table 1 below.

<Comparative Example 3> Manufacturing of pellet-free solar cell encapsulation film

The film mixture was prepared in the same way as Example 2.

Except for the cross-linking agent immersion process in Comparative Example 2, film extrusion did not additionally pelletize the film mixture, but directly extruded the film using a two-screw T-die film extrusion extruder with a cylinder temperature of 100°C, producing a pellet-free process. A battery encapsulation film was prepared.

The physical properties of the pellet-free solar cell encapsulation film of Comparative Example 3 are listed in Table 1 below.

division Example 1 Example 2 Comparative Example 1 Comparative example 2 Comparative example 3 Cross-linking agent classification liquid elegance liquid elegance elegance Crosslinker Soaking X X O X X Manufacture process Double kneader continuous film extruder without dipping process and masterbatch process Double kneader continuous film extruder without dipping process and masterbatch process After submerged pellet manufacturing, T-die film extrusion After manufacturing masterbatch pellets with a twin screw extruder without a immersion process, T-die film extrusion Without immersion process and masterbatch pellet manufacturing process,
T-die film extrusion fish eye rarely found Only a small amount was found rarely found somewhat found Occurs in large quantities light transmittance over 90 88% over 90 87% 85% Yellow Index 3.80% 5.10% 3.80% 4.30% 5.80% moisture absorption rate 0% 0.50% 0% 0.40% 0.90% Damp heat 96% 96% 96% 95% 93% manufacturing efficiency Very good (◎) Very good (◎) Process time is long (△) Bad (X) Bad (X)

As the specific parts of the present invention have been described in detail above, it is clear to those skilled in the art that these specific techniques are merely preferred embodiments and do not limit the scope of the present invention. something to do. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

Claims (19)

A method of manufacturing a solar cell encapsulant film by dispersing the synthetic resin used as a solar cell encapsulant into pellets without dispersing it with two kneaders and performing a continuous film process,
Injecting a film mixture including synthetic resin, cross-linking agent, cross-linking aid, coupling agent, UV absorber, and UV stabilizer into two kneaders, Kneader 1 and Kneader 2, using a screw feeder;
Kneading the film mixture added to the kneader 1 at a temperature of 100 to 150°C for 10 minutes to 2 hours;
When the film mixture of Kneader 1 is exhausted, performing a continuous process of adding the film mixture of Kneader 2 to Kneader 1 and kneading for 10 minutes to 2 hours at a temperature of 100 to 150 ° C.; and
The kneaded film mixture of the kneader 1 is supplied to the main twin feeder connected to a T-die extruder or a calendar extruder maintained at a temperature of 100 to 150 ° C, and the T-die ( Comprising: extruding a non-pellet synthetic resin solar cell encapsulant film through a T-die) extruder or the calendar extruder,
The synthetic resin is a polyolefin elastomer (POE) resin,
The crosslinking agent is 2,2,5-Bis(tert-butylperoxy)-2,5-dimethylhexane, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, dicumyl peroxide, and t-butyl cumyl peroxide. At least one of the oxides,
The light transmittance of the pellet-free synthetic resin solar cell encapsulation film is 88% to 98%,
The moisture barrier property (WVTR) of the pellet-free synthetic resin solar cell encapsulation film is 10 ^-4 g/m ² ·day to 30 based on a temperature of 38°C, a relative humidity of 100%, and a film thickness of 1 mil (25.4 μm). Characterized in that g/m ² ·day
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
delete delete According to claim 1,
The polyolefin elastomer (POE) resin is characterized in that it is an ethylene-α-olefin copolymer.
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
According to claim 4,
The ethylene/α-olefin copolymer includes ethylene and an α-olefin having 3 to 20 carbon atoms,
Characterized in that the content of the structural unit derived from the ethylene is 60 to 85 mol%, and the content of the structural unit derived from the α-olefin having 3 to 20 carbon atoms is 15 to 40 mol%.
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
delete According to claim 1,
The polyolefin elastomer (POE) resin includes ethylene-butene copolymer (EBR)-based polyolefin elastomer resin, ethylene-hexene copolymer (EHR)-based polyolefin elastomer resin, ethylene-octene copolymer (EOR)-based polyolefin elastomer resin, and propylene-butene. Characterized in that it is a copolymer (PBR)-based polyolefin elastomer resin, a propylene-hexene copolymer (PHR)-based polyolefin elastomer resin, or a propylene-octene copolymer (POR)-based polyolefin elastomer resin.
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
delete According to claim 1,
The crosslinking aids include Triallyl isocyanurate (TAIC), Triallyl cyanurate (TAC), Trimethylopropane Trimethacrylate (TMPTMA), Trimethylopropane Triacrylate (TMPTA), 1,2-polybutadiene (HVPBD), Ethylene Glycol Dimethacrylate (EGDMA), and Ethylene Glycol Diacrylate (EGDA). , N,N'-1,3-Phenylene dimaleimide (PDM), Zinc diacrylate (ZDA), Zinc dimethacrylate (ZDMA), 90% Vinyl polybutadiene (HVPBd), 70% Vinyl styrene butadiene copolymer (HVSBR), Tributyl isocyanurate, Tributyl Characterized by one or more selected from the group consisting of cyanurate, Tripropyl isocyanurate, Tripropyl cyanurate, Benzyl isocyanurate, and Benzyl cyanurate.
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
According to claim 1,
The coupling agent
Characterized by one or more selected from the group consisting of Vinyl trimethoxy silane, Octamethyl cyclotetrasiloxane, 3-Methacryloxypropyl methyldimethoxysilane, 3-Methacryloxypropyl trimetoxysilane, 3-Methacryloxypropyl trietoxysilane, 3-Methacryloxypropyl methyldiethoxysilane, and Acryloxypropyl trimetoxysilane.
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
According to claim 1,
The UV absorber is
2-Hydroxy-4-octyloxy Benzophenone, Benzophenone, 2-Hydroxy-4-methoxybenzophenone, 2,2'-Dihydroxy-4,4'-dimethyoxybenzophenone, 2-(2-hydroxy-3,5-di(1,1- dimethylbenzyl)phenyl)2H-benzotriazole, 2-(2-Hydroxy-5-methylphenyl)benzotriazole, 2-(2'-hydroxy-3',5'-ditert-butyl)benzotriazole, 2-3(3-tert-butyl -2-hydroxy-5-methylpheny)-5-chlorobenzotriazole, 2-(3,5-di-tert-butyl-2-hydroxyphenyl)-5-chlorobenzotriazole, 2-(2-hydroxy-3,5-di-tert -amylphenyl)benzotriazole, 2-(2-Hydroxy-5-t-octylphenyl)-benzotriazole, Bis-(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, Methyl 1,2,2,6 ,6-pentamethyl-4-piperidinyl sebacate, 2,2'-Thiobis(4-t-octylphenolato)-n-butylamine nickel II, Reaction products of methyl 3-(3-(2H-benzotriazole-2 -yl)-5 -t-butyl-4-hydroxy phenyl) propionate / PEG 300, Ethyl-2-cyano-3,3-diphenylacrylate, (2-ethylhexyl)-2-cyano-3,3-diphenylacrylate, and N,N'-bisformyl Characterized by one or more selected from the group consisting of -N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-hexamethylendiamine
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
According to claim 1,
The UV stabilizer is
Bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate, Bis(1,2,2,6,6-pentamethyl-4-piperidinyl)sebacate, 2-(2H-benzotriazol-2-yl)- 4-(tert-butyl)-6-(sec-butyl) phenol, 2-(2H-benzotriazol-2-yl)-4-(tert-butyl)-6-(sec-butyl) phenol, Dimethyl succinate polymer with 4-hydroxy-2,2,6,6-tetromethyl-1-piperidine ethanol, Poly{[6-[1,3,3-tetramethylbutyl]amino]-1,3,5-triazine-2,4-diyl} [2,2,6,6-tetramethyl-4-piperidinyl]imino]}, N,N'-bisformyl-N,N'-bis-(2,2,6,6-tetramethyl-4-piperidinyl)-hexamethylendiamine , and Decanedioic acid, bis(2,2,6,6-tetramethyl-1-(octyloxy)-4-piperidinyl)ester, characterized in that one or more selected from the group consisting of
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
According to claim 1,
The film mixture further comprises an antioxidant,
The antioxidant is characterized in that it is a phenol-based antioxidant, a phosphorus-based antioxidant, a sulfur-based antioxidant, or an amine-based antioxidant.
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
According to claim 1,
The pellet-free synthetic resin solar cell encapsulation film is characterized in that it is formed of 1 to 5 layers.
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
delete According to claim 1,
The Yellow Index (YI) of the pellet-free synthetic resin solar cell encapsulation film is characterized in that 1.0 to 10.0.
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.
According to claim 1,
The moisture absorption rate of the pellet-free synthetic resin solar cell encapsulation film is 0% to 1.2%.
Method for manufacturing pellet-free synthetic resin solar cell encapsulation film.






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