KR101275912B1

KR101275912B1 - Preparation Method of Backside Protective Sheet Having Color for Solar Cell Module

Info

Publication number: KR101275912B1
Application number: KR1020110102400A
Authority: KR
Inventors: 박원기
Original assignee: 주식회사 에스에프씨
Priority date: 2011-10-07
Filing date: 2011-10-07
Publication date: 2013-06-17
Also published as: KR20130037887A

Abstract

The present invention comprises the steps of winding up the base film wound on a roller; Applying an adhesive to one side of the unrolled base film; Drying the adhesive-coated base film; Stacking a fluorine-based film on one side to which the adhesive of the dried base film is applied; Primary aging of the base film on which the fluorine-based film is laminated; Forming an extruded resin film by melting and extruding a polymer resin composition including a pigment on the back surface of the base film on which the fluorine-based film is laminated after the aging is completed; And it relates to a method for manufacturing a back protective sheet for a solar cell module having a color comprising the step of secondary aging the base film on which the extruded resin film is formed.

Description

Preparation Method of Backside Protective Sheet Having Color for Solar Cell Module

The present invention relates to a method for manufacturing a back surface protective sheet for a solar cell module having a color, and more particularly, a fluorine-based film is laminated on one side of a base film, and a fluorine-based film is laminated with a pigment on the back of the base film. The present invention relates to a method for manufacturing a back protective sheet for a solar cell module having a color obtained by melt-extruding a polymer resin composition and laminating an extruded resin film.

Recently, a solar cell module is a semiconductor device that converts light energy into electrical energy using a photoelectric effect, and has been in the spotlight with the advantages of pollution-free, noise-free, and infinite supply energy.

Such a solar cell module is usually manufactured by sequentially stacking tempered glass, EVA film, solar cell, EVA film, the back protective sheet, the laminated module is subjected to a high temperature compression laminating process in a vacuum.

In particular, since the solar cell module is installed outdoors to receive sunlight well, a protective sheet for protecting the solar cell module as a back sheet is provided on the rear surface of the solar cell module to withstand the external environment such as snow and rain.

Here, the protective sheet is made of a durable material that can withstand high temperatures and humidity in order to provide a waterproof, insulating and UV protection role and at the same time extend the life of the solar cell module.

The solar cell module back protective sheet has a structure in which PVF / PET / PVF is laminated, and in some products, a structure in which resins such as fluorine-based films such as PVF / PET / EVA and PE are laminated in a film form. It is also manufactured.

Such a solar cell module back protective sheet is usually laminated by first laminating a PVF film on a PET film, and then cured first, and another PVF film or a resin film such as EVA or PE is laminated on the PET film on which the PVF film is laminated. It is manufactured by dry lamination method of secondary lamination by lamination by secondary lamination.

Domestic Publication No. 10-2011-0099361

The present invention provides a color by a continuous process of laminating a fluorine-based film on one side of a base film and laminating a melt-extruded resin film in which a polymer resin composition comprising a pigment is melt-extruded on a back side of the base film on which the fluorine-based film is laminated. It provides a method for manufacturing a back protective film for a solar cell module having a color to enable mass production of the back protective film for a solar cell module having a quick and inexpensive.

The present invention comprises the steps of winding up the base film wound on a roller;

Applying an adhesive to one side of the unrolled base film;

Drying the adhesive-coated base film;

Stacking a fluorine-based film on one side to which the adhesive of the dried base film is applied;

Primary aging of the base film on which the fluorine-based film is laminated;

Forming an extruded resin film by melting and extruding a polymer resin composition including a pigment on the back surface of the base film on which the fluorine-based film is laminated after the aging is completed; And

It provides a method for manufacturing a back protective sheet for a solar cell module having a color comprising the step of secondary aging the base film on which the extruded resin film is formed.

The present invention is laminated by a fluorine-based film on one side of the base film, the melt-extruded polymer resin composition comprising a pigment on the back surface of the base film on which the fluorine-based film is laminated by a continuous process of laminating a melt-extrusion resin film It is possible to mass-produce the back surface protective film for a solar cell module having.

1 is a flow chart showing a method of manufacturing a back protective sheet for a solar cell module having a color according to the present invention;
Figure 2 is a cross-sectional view showing the configuration of the rear protective sheet for solar cell module having a color according to the present invention.

The present invention comprises the steps of winding up the base film wound on a roller; Applying an adhesive to one side of the unrolled base film; Drying the adhesive-coated base film; Stacking a fluorine-based film on one side to which the adhesive of the dried base film is applied; Primary aging of the base film on which the fluorine-based film is laminated; Forming an extruded resin film by melting and extruding a polymer resin composition including a pigment on the back surface of the base film on which the fluorine-based film is laminated after the aging is completed; And it provides a method for manufacturing a back protective sheet for a solar cell module comprising the step of secondary aging the base film on which the extruded resin film is formed.

The rear protective sheet for a solar cell module according to the present invention is a sheet for protecting the solar cell module, and may be referred to as a back sheet because it is attached and applied to the rear surface of the solar cell module.

The back surface protective sheet for the solar cell module, and the back surface protective sheet for the solar cell module having a specific color, the fluorine-based film is laminated or laminated on one side of the base film, the back of the base film on which the fluorine-based film is laminated The polymer resin composition comprising a pigment in the melt-extruded extruded resin film is configured to be laminated.

At this time, the extruded resin film in which the polymer resin composition is melt-extruded is colored by the pigment included in the polymer resin composition.

In a particular embodiment, the polymer resin composition comprising the pigment according to the present invention comprises 0.5 to 2.0 parts by weight of an ultraviolet absorber based on 100 parts by weight of the base resin; 5 to 20 parts by weight of pigment; It may include 0.1 to 2.0 parts by weight of antioxidant.

Here, the base resin may use PVB, PE, LDPE, LLDPE, EVA or a mixture thereof.

On the other hand, the base film constituting the back protective sheet for a solar cell module having a color according to the present invention may be used PET, low oligomer PET, PI, PEN or a mixture thereof.

Here, the low content oligomer PET refers to a PET content of less than 20% of the PET having a molecular weight less than the average molecular weight of the PET used in the PET film manufacturing process.

In addition, the fluorine-based film may use PVF, PVDF, THV resin, TFE, PCTFE, ETFE or a mixture thereof.

On the other hand, melt extrusion according to the present invention can be extruded by melting a polymer resin composition comprising a pigment to be extruded at a temperature of 280 to 330 ℃, the extrusion of the polymer resin composition may be used Ti.

The adhesive may be a polyurethane adhesive or a modified polyester adhesive.

In addition, the step of aging, for example primary aging the base film on which the fluorine-based film is laminated using the adhesive may be aged for 20 to 48 hours at a temperature of 40 to 60 ℃ illustratively.

In addition, the step of aging, for example secondary aging the base film on which the extruded resin film is formed may be aged for 100 to 150 hours at a temperature of 40 to 60 ℃.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, the following description is only for the purpose of specifically describing the present invention, and the scope of the present invention is not limited by the following description.

1 is a flow chart showing a method for manufacturing a solar cell module back protective sheet according to the present invention, Figure 2 is described as a cross-sectional view showing the configuration of the solar cell module back protective sheet according to the present invention.

1 and 2, the manufacturing method of the back protective sheet for solar cell module according to the present invention comprises the steps of unwinding the base film wound on the roller (S10); Applying an adhesive to one side of the unrolled base film (S20); Drying the base film to which the adhesive is applied (S30); Stacking a fluorine-based film on one side to which the adhesive of the dried base film is applied (S40); Primary aging of the base film on which the fluorine-based film is laminated (S50); After the aging is completed, the step of melt-extrusion (S60) a polymer resin composition comprising a pigment on the back of the base film laminated fluorine-based film to form an extruded resin film (S70); And secondary aging the base film on which the extruded resin film is formed (S80).

The step of unwinding the base film wound on the roller according to the present invention (S10) is a solar cell module back protective sheet, a substrate film constituting a back surface protective sheet for a solar cell module having a specific color in advance from the roller It unwinds a base film.

Here, the base film is to provide insulation and strength to the back protective sheet for the solar cell module, if the film for this purpose is not particularly limited, PET (Polyethylene terephthalate), low oligomer (low oligomer) PET, PI ( Polyimide), PEN (polyethylene naphthalene) or a mixture thereof may be selected.

The step (S20) of applying the adhesive to one side of the base film according to the present invention is to apply an adhesive for laminating by laminating a fluorine-based film to the base film to be unwound.

At this time, the adhesive is for firmly attaching the fluorine-based film and the base film, it is preferable to use a polyurethane-based adhesive or a polyester-based adhesive.

In addition, the coating thickness of the adhesive applied to one side of the base film is not particularly limited, but may be 5 to 10㎛.

Specifically, the adhesive may include a main agent and a curing agent, wherein the ratio of the main agent and the curing agent may be 7 to 10 parts by weight of the curing agent, and 80 to 150 parts by weight of the solvent, based on the solvent. have.

Here, the solvent is removed by evaporation in the drying step (S30).

At this time, the drying step (S30) may be dried at a temperature of 80 to 120 ℃ the base film to which the adhesive is applied.

Laminating a fluorine-based film on one side of the adhesive base of the dried base film according to the present invention (S40) is laminated on the base film by fluorine-based film providing durability and insulation to the back protective sheet for solar cell module It is for.

At this time, the base film and the fluorine-based film may be laminated using a pressure roller.

The fluorine-based film is a film made of a polymer resin containing a fluorine component, and provides durability and insulation to a back protective sheet for a solar cell module.

Representative materials that can be used for the fluorine-based film include polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF), a polymer of tetrafluoroethylene, hexafluoropropylene and vinylidene fluoride (TFE), tetrafluoroethylene (TFE), polychlorotrifluorofluoro (PCTFE), and ETFE ( Ethylene tetrafluoroethylene) or a mixture thereof is preferable.

The primary aging step (S50) of the base film on which the fluorine-based film is laminated according to the present invention is laminated by an adhesive so that the laminated fluorine-based film and the base film may be more firmly laminated.

The first aging step (S50) may be aged for 20 to 48 hours at a temperature of 40 to 60 ℃.

After completion of the aging according to the present invention, the step of forming a extruded resin film by melt extrusion (S60) a polymer resin composition comprising a pigment on the back of the base film laminated fluorine-based film (S70) for the final solar cell module It is for forming a polymer resin film, specifically, a polymer resin film containing a pigment on the back of the base film on which the fluorine-based film is laminated in order to manufacture the back protective sheet.

In this case, the polymer resin film has a unique color due to the pigment contained in the polymer resin composition for producing a film through melt extrusion.

In addition, since the polymer resin film is formed by melt extrusion using an extruder, in the present invention, the polymer resin film may be referred to as an extruded resin film, and the polymer resin may be referred to as an extruded resin.

In addition, the extruded resin film formed by extruding the polymer resin composition may increase the adhesion strength by stacking the base film of the solar cell module back protective sheet to the outside, thereby preventing the solar cell module back protective sheet from being easily peeled off. have.

Here, the base resin is a material that can be melt-extruded by an extruder, for example, polyvinyl butyral (PVB), polyethylene (PE), low-density polyethylene (LDPE), linear low-density polyethylene (LDLPE), and ethyl vinyl Acetate) or a mixture thereof.

The ultraviolet absorber included in the polymer resin composition according to the present invention, for example, a polymer resin composition containing a pigment, is to allow the extruded resin film to absorb ultraviolet rays in order to prevent discoloration and discoloration by ultraviolet rays of the extruded resin film. As long as it is a conventional ultraviolet absorber for this purpose, you may use it.

As an example of the ultraviolet absorber, a benzophenone-based, benzotriazole-based, salicylic-based, acrylonitrile-based ultraviolet absorber or a mixture thereof may be used.

In addition, the amount of the ultraviolet absorbent may be 0.5 to 2.0 parts by weight based on 100 parts by weight of the base resin.

Here, when the amount of the ultraviolet absorber is less than 0.5 parts by weight, the ultraviolet light may not be sufficiently absorbed. If the amount of the ultraviolet absorber is more than 2.0 parts by weight, the gel may be used as a nucleus of the extruded resin due to the excessive amount of the ultraviolet absorber during the extrusion process. Gel, resin agglomeration phenomenon) is formed.

The pigment contained in the polymer resin composition according to the present invention is to provide a color to the back protective sheet for solar cell module, any pigment may be used as long as it has this purpose.

As an example of the said pigment, composite metals, such as titanium oxide, a calcium carbonate, carbon black, a copper- chromium- manganese alloy, or a mixture thereof can be used.

In addition, the amount of the pigment may be 5 to 20 parts by weight based on 100 parts by weight of the base resin.

When the amount of the pigment used is less than 5 parts by weight, it is not possible to provide sufficient color to the extruded resin film constituting the back protective sheet for solar cell module, the back protective sheet for solar cell module having a specific color, 20 parts by weight If exceeded, there is a problem in that workability and hydrolysis resistance decrease.

The antioxidant according to the present invention is for preventing the oxidation of the extruded resin film formed by melt extrusion of a polymer resin composition, specifically, a polymer resin composition including a pigment, that is, aging, and is commonly used for this purpose. Any antioxidant may be used.

As an example of the said antioxidant, penpentaerythryl- tetrakis [3- (3, 5-di-t- butyl- 4-hydroxyphenyl) propionate], 2,2'- thiodiethylbis -[3- (3,5-di-t-butyl-4-hydroxyphenyl) -propionate], octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) prop Cypionate, 4,4'-thiobis (6-t-butyl-m-cresol), triethylene glycol-bis-3 (3-t-butyl-4-hydroxy-5-methylphenyl) propionate 4, 4'-Tiobis [2- (1,1-di-methyethyl) -5-methyl-phenol, tetrakis-methylene (3,5-di-tert-butyl-4-hydroxycinnanate) -methane and the like Phenol-based antioxidants, or ester-based antioxidants such as dilauryl thiodipropionate or mixtures thereof.

The amount of the antioxidant may be 0.1 to 2.0 parts by weight based on 100 parts by weight of the base resin.

On the other hand, the melt extrusion (S60) of the extruded resin (polymer resin composition) to form an extruded resin film according to the present invention may be made through a T-die.

The melt extrusion is preferably performed by extruding a polymer resin composition, specifically a polymer resin composition containing a pigment at a temperature of 280 to 330 ° C.

Here, the melt index (MI) of the melt extrusion resin is preferably 5 to 18, it is possible to adjust the temperature, extrusion amount and pressure of the T-die cylinder according to the MI value.

The second step of aging the base film on which the extruded resin film is formed according to the present invention (S80) is formed by melt extrusion so that the laminated extruded resin film and the base film are more firmly laminated.

The secondary aging step (S50) may be aged for 100 to 120 hours at a temperature of 40 to 60 ℃.

Hereinafter, the present invention will be described in detail by way of examples. However, the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

< Example 1>

The PET film [SG00L, SKC, South Korea] was unwound as a base film wound on a roller, introduced into an adhesive applicator [Gravure], and then an adhesive [Toyo Morton, Japan] was applied to one side of the PET film.

Then, the PET film to which the adhesive was applied was dried at a temperature of about 100 ° C.

Then, the PVF film [Tedlar, Dupont, USA], which is a fluorine-based film, was pressed on the adhesive coated surface of the PET film using a pressure roller, and the PET film and the PVF film were laminated and wound on a roller.

Then, the PET film and the PVF film were laminated and laminated to the film at a temperature of about 50 ° C. for 24 hours.

Next, the PET film was unwound from a roller on which the PET film on which the PVF film was laminated was unrolled, and the PET film was moved to an extruder (Tandem Extruder, SFC, South Korea) equipped with a T-die.

Then, an extruded resin film was formed by extruding the extruded resin on the back surface of the PET film on which the PVF film was laminated using an extruder equipped with a Ti-die.

Here, the extruded resin is 100 kg LLDPE [Hanhwa Petrochemical, Korea] as a base resin, 500 g of UV absorbers [SONGLIGHT7910, Songwon Industries, Korea], 8 kg of pigment [Carbon MA-100, Mitsubishi Chemical, Japan] and antioxidant [SONGNOX, Songwon Industry, South Korea] was prepared by mixing 100g.

In addition, the extruder was maintained at a temperature of about 300 ℃ to melt the extruded resin.

Then, the melt-extruded sheet was aged at a temperature of about 50 ° C. for 120 hours to prepare a back protective sheet for a solar cell module.

< Example 2>

The PET film [SG00L, SKC, Korea] was unwound as a base film wound on a roller, introduced into an adhesive applicator [Gravure], and then an adhesive [Toyo Morton, Japan] was applied to one side of the base film.

Then, the PET-coated PET film was transferred to a dryer and dried at a temperature of about 100 ° C.

Here, the extruded resin is 100 kg of EVA [Samsung Total, Korea] as a base resin, 1 kg of ultraviolet absorber [SONGLIGHT7910, Songwon Industrial, Korea], 10 kg of pigment [Carbon MA-100, Mitsubishi Chemical, Japan] and antioxidant [SONGNOX, Songwon Industrial Co., Ltd.] , South Korea] was prepared by mixing 100g.

In addition, the extruder was maintained at a temperature of about 280 ℃ to melt the extruded resin.

< Example 3>

Then, the PVDF film [Kynar, Arkema, France], which is a fluorine-based film, was pressed on the adhesive coated surface of the PET film using a pressure roller, and the PET film and the PVDF film were laminated and wound on a roller.

Then, the PET film and the PVDF film were laminated and laminated to the film at a temperature of about 50 ° C. for 24 hours.

Next, the PET film was uncoiled from the roller on which the PET film on which the PVDF film was laminated was unloaded, and the PET film was moved to an extruder (Tandem Extruder, SFC, South Korea) equipped with a T-die.

Here, the extruded resin is 100 kg of EVA [Samsung Total, Korea] as a base resin, 1 kg of ultraviolet absorber [Hisorb-770, LG Chemical, Korea], 10 kg of pigment [Carbon MA-100, Mitsubishi Chemical, Japan] and antioxidant [AO180T, Taurex, South Korea] was prepared by mixing 100g.

< Example 4>

The PET film [SG00L, SKC, South Korea] was unwound and introduced into an adhesive applicator [Gravure] as a base film wound on a roller, and then an adhesive [Henkel, Germany] was applied to one side of the PET film.

Then, the PET film to which the adhesive was applied was dried at a temperature of about 90 ° C.

Then, the ETFE film [AGC, Japan], which is a fluorine-based film, was pressed on the adhesive coated surface of the PET film using a pressure roller, and the PET film and the ETFE film were laminated and wound on a roller.

Thereafter, the PET film and the ETFE film were laminated to be laminated, and the film was aged for 24 hours at a temperature of about 50 ° C.

Next, the PET film was unwound from the roller on which the PET film on which the ETFE film was laminated was unrolled, and the PET film was moved to an extruder (Tandem Extruder, SFC, South Korea) equipped with a T-die.

Then, an extrusion resin film was formed by extruding PVB [Dupont, South Korea], which is an extruded resin, on the back of the PET film on which the PVF film was laminated using an extruder equipped with a Ti-die.

Here, the extruded resin is LDPE [Hanhwa Petrochemical, Korea] 100kg, UV absorber [Hisorb-770, LG Chemical, Korea] 800g as a base resin, pigment [Hi-Black 20L, Hyundai Chemical, Korea] 8kg and antioxidant [ AO180T, Taurex, South Korea] was prepared by mixing 150g.

In addition, the extruder was maintained at a temperature of about 290 ℃ to melt the extruded resin.

<Experiment>

Constant temperature and humidity

In order to measure the degree of delamination and discoloration [delta E value (measured by color difference meter)] of the back protective sheet for solar cell modules manufactured according to Examples 1 to 4, the temperature was 85 ° C., the humidity was 85%, and the temperature was RH 2,000 hours. Constant temperature and humidity test was done.

As a result, all of the back protective sheet produced according to Examples 1 to 4 did not peel off and discolor (dELTA E value was 3.0 or less) during the experiment.

Ultraviolet exposure

375 hours (total irradiation 15 kWh) on an ultraviolet tester with an irradiation intensity of 40 W / m 2 to measure the degree of yellowing [delta YI value (measured with a color difference meter)] of the back protective sheet for solar cell modules manufactured according to Examples 1 to 4. / M 2) was subjected to an ultraviolet exposure test.

As a result, all of the back protective sheet prepared according to Examples 1 to 4 did not occur yellowing (delta YI value is 3.0 or less) during the experiment.

Bond strength

Lay EVA sheet [Mitsui Fabro, Japan] on the low-iron tempered glass substrate prepared in 15cm x 15cm size and laminate it so that the extruded resin side of the protective sheet is in close contact with the EVA sheet and laminate it at 150 ℃ for 20 minutes. Adhesion strength (peel strength) was measured by the method given in ASTM D 1876 standard.

As a result, the back protective sheets prepared according to Examples 1 to 4 exhibited an adhesion strength of 40 N / cm or more higher than the desired attachment strength of the back protective sheet for the solar cell module.

Partial discharge voltage

Partial discharge voltage was measured by the method proposed in IEC 60664-1.

As a result, the back protective sheets prepared according to Examples 1 to 4 were measured with a partial discharge voltage of 1,000 VDC or more required as the back protective sheet for the solar cell module.

Heating shrinkage

Heat shrinkage was measured by the method given in ASTM D 1204 standard.

As a result, the back protective sheets prepared according to Examples 1 to 4 were MD, TD heat shrinkage ratio of 1.2%, TD 1.0% or less, which are basic physical property requirements of back protective sheets for solar cell modules.

Water vapor permeability

Water vapor permeability was measured by the method given in the ASTM F 1249 standard.

As a result, the water vapor permeability of the back protective sheets prepared according to Examples 1 to 4 was measured to be 2.0 to 2.5 g / m 2, 24hr or less.

In general, the water vapor transmission rate of the back protective sheet for solar cell module is 2g / ㎡, 24hr to 3g / ㎡, 24hr, the back protective sheet prepared according to the embodiment 1 to 4 of the present invention satisfies the basic requirements.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Therefore, all the above-described embodiments are to be understood as illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention without departing from the scope of the present invention.

Claims

Unwinding the base film wound on the roller;
Applying an adhesive to one side of the unrolled base film;
Drying the adhesive-coated base film;
Stacking a fluorine-based film on one side to which the adhesive of the dried base film is applied;
Primary aging of the base film on which the fluorine-based film is laminated;
0.5 to 2.0 parts by weight of an ultraviolet absorber based on 100 parts by weight of the base resin on the back surface of the base film on which the fluorine-based film is laminated after the aging is completed; 5 to 20 parts by weight of pigment; And melt-extruding the polymer resin composition comprising a pigment including 0.1 to 2.0 parts by weight of an antioxidant to form an extruded resin film; And
Method of manufacturing a back protective sheet for a solar cell module having a color comprising the step of secondary aging the base film on which the extruded resin film is formed.

delete

The method of claim 1,
The base resin is PVB, PE, LDPE, LLDPE, EVA or a method of manufacturing a back protective sheet for a solar cell module having a color, characterized in that it comprises a mixture thereof.

The method of claim 1,
The pigment is a method of manufacturing a back protective sheet for a solar cell module having a color comprising a composite metal such as titanium oxide, calcium carbonate, carbon black, copper-chromium-manganese alloy or a mixture thereof.

The method of claim 1,
The base film is a PET, low content oligomer PET, PI, PEN or a method for manufacturing a back protective sheet for a solar cell module having a color, characterized in that a mixture thereof.

The method of claim 1,
The fluorine-based film is PVF, PVDF, THV resin, TFE, PCTFE, ETFE or a method of manufacturing a back protective sheet for a solar cell module having a color, characterized in that a mixture thereof.

The method of claim 1,
The adhesive is a method of manufacturing a back protective sheet for a solar cell module having a color, characterized in that the polyurethane-based adhesive or polyester-based adhesive.

The method of claim 1,
The step of primary aging the base film laminated the fluorine-based film is a method of manufacturing a back protective sheet for a solar cell module having a color, characterized in that aged for 20 to 48 hours at a temperature of 40 to 60 ℃.

The method of claim 1,
The melt extrusion is a method of manufacturing a back protective sheet for a solar cell module having a color, characterized in that using a T-die.

The method of claim 1,
The melt extrusion is a method of manufacturing a back protective sheet for a solar cell module having a color, characterized in that the resin is melted and extruded at a temperature of 280 to 330 ℃.

The method of claim 1,
The second step of aging the base film on which the extruded resin film is formed is a method of manufacturing a back protective sheet for a solar cell module having a color, characterized in that for aging for 100 to 150 hours at a temperature of 40 to 60 ℃.