JP2017064659A - Method for correcting infrared permeable protective sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for correcting a defective portion which inevitably occurs in a manufacturing stage in an infrared permeable protective sheet usable in a rear face protective sheet for solar cell module.SOLUTION: A method for correcting an infrared permeable protective sheet 1 having a structure composed of an infrared permeable dark color layer 12 containing an infrared permeable pigment and a transparent resin film layer 13 laminated on the surface of the infrared permeable dark color layer 12 includes applying an infrared permeable correction ink 121 containing an infrared permeable pigment onto the surface of the transparent resin film layer 13 in a form to cover a defective portion 14 occurring in any layer of the infrared permeable dark color layer 12 and/or the transparent resin film layer 13, and correcting the defective portion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for correcting an infrared transparent protective sheet. Specifically, the resin film manufacturing stage is mainly used as a back surface protective sheet for solar cell modules, and the resin film has an infrared transparent protective sheet having a layer having a function of transmitting near infrared rays. It is related with the method of correcting the defect | deletion part resulting from the fish eye etc. which are unavoidable by this.

  In recent years, solar cells as a clean energy source have attracted attention due to the growing awareness of environmental issues. In general, a solar cell module that constitutes a solar cell has a configuration in which a transparent front substrate, a front sealing material, a solar cell element, a back sealing material, and a back surface protection sheet are sequentially laminated from the light receiving surface side. It has a function of generating electricity by being incident on the solar cell element.

  For example, as a method for coloring the appearance of the back protective sheet, which is a resin sheet disposed in the outermost layer of the solar cell module, to black, a method of applying a black pigment layer containing carbon black to the outermost layer is common. . However, these black pigment layers absorb not only visible light but also near infrared rays that contribute to the improvement of power generation efficiency. In addition, absorption of near infrared rays not only adversely affects power generation efficiency, but also causes an increase in temperature in the module, which also causes a decrease in power generation capability of the solar cell element.

  Therefore, various dark organic pigments that do not absorb near infrared rays, such as oxazine pigments, are prepared as a coloring material for forming a dark layer that transmits infrared rays on the surface of the infrared ray transmitting protective sheet for solar cell modules. A dark ink is proposed (Patent Document 1). These infrared transmissive dark inks can prevent the near infrared rays from being absorbed by the dark color layer, thereby suppressing the temperature rise of the solar cell module, and further allowing the transmitted near infrared rays to contribute to power generation. Thereby, the design property of the color close | similar to black can be provided to an infrared rays transparent protection sheet and a solar cell module, avoiding the fall of the power generation efficiency of a solar cell module.

  Here, in the infrared protective sheet as described above, a dark color layer that transmits infrared rays is usually not exposed on the surface, and the surface of the same layer ensures adhesion to other base materials. A layer made of some kind of transparent resin film, such as an adhesive layer for the purpose, is laminated.

  Such a resin film substantially eliminates the mixing of foreign substances such as foreign matters and non-gelled particles (so-called fish eyes) in the manufacturing stage and the fine defects of the resin layer resulting therefrom. This is inevitable (see Patent Document 2). In the present specification, the fine voids and defects in these resin films are collectively referred to as “defects”. The method for correcting the defect portion has not yet been implemented, and the portion where the defect has occurred is currently discarded, and this is a protective sheet for solar cells manufactured using expensive functional pigments. However, in terms of economy, it was strongly desired to take some improvement measures for this problem.

Japanese Patent Application Laid-Open No. 2012-216689 Japanese Patent Laid-Open No. 7-229851

  The objective of this invention is providing the correction method of the defect | deletion part inevitably produced in a manufacturing stage in the infrared rays transparent protective sheet which can be used for the back surface protection sheet for solar cell modules, for example.

  As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have applied a correction method in which a defect portion generated in a transparent resin film layer is covered with a correction ink containing a pigment contained in an infrared transmitting dark color layer. The present inventors have found that the above problems can be solved, and have completed the present invention. More specifically, the present invention provides the following.

  (1) A method for correcting an infrared transmitting protective sheet having a configuration comprising an infrared transmitting dark color layer containing an infrared transmitting pigment and a transparent resin film layer laminated on the surface of the infrared transmitting dark color layer In the aspect of covering a defect formed in any one of the infrared transparent dark layer and / or the transparent resin film layer, the infrared transparent pigment is included on the surface of the transparent resin film layer. A correction method for applying an infrared transparent correction ink.

  (2) The infrared transmissive pigment is one or a plurality of pigments selected from phthalocyanine pigments, dioxazine pigments, isoindoline pigments, quinacridone pigments, and brown pigments, Benzimidazolone pigment, 4-[(2,5-dichlorophenyl) azo] -3-hydroxy-N- (2,5-dimethoxyphenyl) -2-naphthalenecarboxamide, 1-[(4-nitrophenyl) azo] 2-naphthalenol, bis [3-hydroxy-4- (phenylazo) -2-naphthalenecarboxylic acid] copper salt, C.I. I. Pigment Brown 7, N, N′-bis (2,4-dinitrophenyl) -3,3′-dimethoxy-1,1′-biphenyl-4,4′-diamine, 3,4,9,10-perylenetetracarboxylic sun Diimide, Δ2,2 ′ (1H, 1′H) -binaphtho [2,1-b] thiophene-1,1′-dione and N, N ′-(10,15,16,17-tetrahydro-5,10 , 15,17-tetraoxo) -5H-dinaphtho [2,3-a: 2′3′-i] carbazole-4,9-diyl) bis (benzamide). The correction method of the infrared rays transparent protective sheet as described in (1).

  (3) The infrared transmissive protective sheet correcting method according to (1) or (2), wherein the infrared transmissive pigment is a dark pigment composed of the brown pigment and the phthalocyanine pigment.

  (4) The method for correcting an infrared transparent protective sheet according to any one of (1) to (3), wherein the transparent resin film layer is an olefin resin layer.

  (5) The manufacturing method of the infrared rays transparent protective sheet for solar cell modules which includes the process of correcting the said defect | deletion part by the correction method in any one of (1) to (4).

  ADVANTAGE OF THE INVENTION According to this invention, the correction method of the defect | deletion part which arises unavoidable in a manufacturing stage can be provided in the infrared rays transparent protection sheet which can be used for the back surface protection sheet for solar cell modules.

It is sectional drawing which shows typically the aspect of the cross section of the protective sheet corrected by the correction method of the infrared rays transparent protective sheet of this invention. It is sectional drawing which shows typically the laminated constitution of the solar cell module which can be comprised using the protective sheet shown in FIG.

  Hereinafter, the correction method of the infrared transparent protective sheet of this invention is demonstrated. However, in order to facilitate understanding of the present invention, first, an infrared transparent protective sheet for a solar cell module and a solar cell module using the same will be described. The correction method of the invention will be described. The present invention is not limited to the embodiments described below.

<Solar cell module>
First, a general layer configuration of a solar cell module 10 using the infrared transparent protective sheet 1 as an object for carrying out the method for correcting an infrared transparent protective sheet of the present invention as a back protective sheet will be described. As shown in FIG. 2, this solar cell module 10 has infrared transparent protection as a transparent front substrate 2, a front sealing material 3, a solar cell element 4, a back sealing material 5, and a back surface protection sheet from the light receiving surface side. The sheet 1 has a configuration in which the sheets 1 are sequentially stacked.

[Method for manufacturing solar cell module]
The solar cell module 10 can be manufactured by integrating the above-described constituent members by thermocompression bonding, for example, by vacuum heat laminating. In this case, the laminating temperature is preferably in the range of 130 ° C to 190 ° C. The laminating time is preferably in the range of 5 minutes to 60 minutes, particularly preferably in the range of 8 minutes to 40 minutes.

<Infrared transparent protective sheet>
[Outline of layer structure]
Next, the infrared transparent protective sheet 1 that is an object for carrying out the method for correcting the infrared transparent protective sheet of the present invention will be described. As shown in FIG. 1, the infrared transparent protective sheet 1 includes an infrared transparent dark color layer 12 formed on the surface of the base resin layer 11 and a transparent resin film layer 13 formed on the surface of the infrared transparent dark layer 12. It is comprised including. However, the infrared transmissive dark color layer 12 may be formed by kneading an infrared transmissive pigment into a base resin to form the base resin layer itself as an infrared transmissive dark color layer. In the following, an embodiment in which an infrared transmitting dark color layer 12 is formed on the surface of a base resin as shown in FIG. 1 will be described as a representative embodiment of the present invention. The method for correcting an infrared transparent protective sheet according to the present invention is a resin layer inevitably generated as described above in the process of forming the transparent resin film layer 13 among the layers constituting the infrared transparent protective sheet 1. This is a method of restoring the design properties and optical characteristics of the sheet to a level that the sheet should originally have by correcting the defects of the infrared-transmitting protective sheet due to the presence of the defect portion 14 with a specific correction ink.

[Infrared transparent dark layer]
The infrared transparent dark color layer 12 is formed by coating the surface of the base resin layer 11 with an ink containing an infrared transparent pigment that transmits near infrared rays having a wavelength of 750 nm to 1500 nm by various printing methods such as screen printing. can do. In addition, an ink containing a dark color pigment is further mixed with an appropriate amount of a curing agent or the like to form a dark color adhesive, for example, an infrared transmissive dark color layer disposed between the base resin layer 11 and the transparent resin film layer 13. 12 can also be configured. The infrared transmissive dark color layer 12 is formed by mixing an infrared transmissive pigment with a transparent resin for forming this layer to form a dark resin sheet, and this is used as an infrared transmissive dark color layer 12 as a base resin. It may be laminated on the layer 11. The details of the infrared transmitting pigment that transmits near infrared rays will be described later. Further, the infrared transmissive dark color layer 12 may be formed so as to be visible on the entire surface of the infrared transmissive protective sheet 1 or, if necessary, visible only on a part of the surface of the infrared transmissive protective sheet 1. It may be formed as simple patterning.

  The infrared transmissive dark color layer 12 can be a dark color layer composed of a mixture of various pigments as long as it is an infrared transmissive layer that transmits near infrared rays. Examples of pigments that can be used to form an infrared transmitting dark layer that transmits near infrared rays include oxazine pigments that are purple pigments, phthalocyanine pigments that are blue pigments, and benzimidazolone that is a brown pigment. And quinacridone pigments which are red pigments, yellow pigments, isoindolinone pigments, and red pigments. Other examples of the brown pigment include 4-[(2,5-dichlorophenyl) azo] -3-hydroxy-N- (2,5-dimethoxyphenyl) -2-naphthalenecarboxamide, 1-[(4- Nitrophenyl) azo] -2-naphthalenol, bis [3-hydroxy-4- (phenylazo) -2-naphthalenecarboxylic acid] copper salt, C.I. I. Pigment Brown 7, N, N′-bis (2,4-dinitrophenyl) -3,3′-dimethoxy-1,1′-biphenyl-4,4′-diamine, 3,4,9,10-perylenetetracarboxylic sun Diimide, Δ2,2 ′ (1H, 1′H) -binaphtho [2,1-b] thiophene-1,1′-dione and N, N ′-(10,15,16,17-tetrahydro-5,10 , 15,17-tetraoxo) -5H-dinaphtho [2,3-a: 2′3′-i] carbazole-4,9-diyl) bis (benzamide) and the like. By appropriately mixing and using these pigments, the infrared transmissive dark color layer 12 that transmits near infrared rays can be formed. The oxazine pigment can be used alone because it can develop a dark purple color close to black even when used alone.

(Infrared transparent dark ink)
The color of the infrared transmissive dark color layer 12 can be various colors by mixing the above-mentioned dark pigments. Hereinafter, a particularly preferable black design for the infrared transmissive dark color layer 12 and power generation The details of the infrared transparent dark ink that can impart infrared transparency that can contribute to the improvement of efficiency will be described. This infrared transparent dark ink includes a dark pigment composed of the above brown pigment and a phthalocyanine pigment. Infrared transparent dark ink containing a pigment component comprising such a dark pigment has a dark appearance and high infrared transmittance, and is particularly excellent as an infrared transparent protective sheet for solar cells. As described later in the examples, the ink is a fresh ink.

  As a typical brown pigment, a benzimidazolone pigment can be used. The benzimidazolone pigment is a pigment having a benzimidazolone skeleton represented by the following general formula (1). Specifically, PigmentYellow120, PigmentYellow151, PigmentYellow154, PigmentYellow175, PigmentYellow180, PigmentYellow181, PigmentYellow194, Pigment Red175, PigmentRed176, PigmentRed185, PigmentRed208, Pigment Violet32, PigmentOrange36, PigmentOrange62, PigmentOrange72, but PigmentBrown25 etc., not limited thereto . C. from the viewpoint of color gamut. I. Pigment Brown 25 is more preferable.

  The phthalocyanine pigment is a pigment having a phthalocyanine skeleton, and includes a phthalocyanine coordinated with various metals. Specifically, C.I. I. PigmentGreen 7, C.I. I. PigmentGreen 36, C.I. I. Pigment Green 37, C.I. I. PigmentBlue 16, C.I. I. PigmentBlue 75, or C.I. I. Pigment Blue 15 and the like can be mentioned, but the invention is not limited to this. It is preferable to use an amorphous phthalocyanine pigment and a blue pigment.

  The content of the brown pigment of the infrared transmissive dark ink is 43 parts by mass or more and 233 parts by mass or less with respect to 100 parts by mass of the phthalocyanine pigment (the content ratio of the brown pigment and the phthalocyanine pigment is 30 by mass). : 70 to 70:30), preferably 66 parts by mass or more and 150 parts by mass or less (the content ratio of the brown pigment and the phthalocyanine pigment is in the range of 40:60 to 60:40 by mass ratio). ) Is more preferable. By setting the content ratio in such a range, the infrared transparent dark ink can be preferable in terms of design and infrared transmission.

  The content of the brown pigment in the infrared transmissive dark ink can be specified by the transmittance of light having a specific wavelength in the light transmittance test. In order to make the content of brown pigments such as benzimidazolone pigments and the content of phthalocyanine pigments preferable in terms of design and infrared transparency, they are included in infrared transparent dark ink. The brown pigment such as benzimidazolone pigment and the phthalocyanine pigment are 80% by mass or more in the total amount of the pigment component, and the transmittance of light having a wavelength of 425 nm in the light transmittance test of the infrared transmissive dark ink is 5%. The transmittance of light having a wavelength of 675 nm is preferably 4% or more and 20% or less. The phthalocyanine pigment has a property of transmitting a certain amount of light having a wavelength of 425 nm and not transmitting light having a wavelength of 675 nm. A brown pigment such as a benzimidazolone pigment has a property of transmitting a certain amount of light having a wavelength of 675 nm, and has a property of not transmitting light having a wavelength of 425 nm. Therefore, by specifying the transmittance of light at a wavelength of 425 nm and the transmittance of light at a wavelength of 675 nm in the light transmittance test, the content of brown pigments such as benzimidazolone pigments and the content of phthalocyanine pigments The content ratio with the amount can be specified.

  The method for measuring the transmittance of the infrared transmissive dark ink is, for example, gravure-coated infrared transmissive dark ink containing a curing agent on white PET, laminated polyethylene thereon, 45 ° C. to 55 ° C., A back surface protection sheet is prepared by aging treatment for 168 hours and overheating, and the reflectance of light with a wavelength of 300 nm to 1200 nm (with a spectrophotometer ("U-4100" manufactured by Hitachi High-Technologies Corporation)) ( %) And the transmittances of light having a wavelength of 450 nm and light having a wavelength of 700 nm can be obtained respectively.

  The content of the brown pigment in the infrared transmissive dark ink can be specified by the transmittance of light having a specific wavelength in the light transmittance test. In order to make the content of brown pigments such as benzimidazolone pigments and the content of phthalocyanine pigments preferable in terms of design and infrared transparency, they are included in infrared transparent dark ink. The brown pigment such as benzimidazolone pigment and the phthalocyanine pigment are 80% by mass or more in the total amount of the pigment component, and the transmittance of light having a wavelength of 425 nm in the light transmittance test of the infrared transmissive dark ink is 5%. The transmittance of light having a wavelength of 675 nm is preferably 4% or more and 20% or less. The phthalocyanine pigment has a property of transmitting a certain amount of light having a wavelength of 425 nm and not transmitting light having a wavelength of 675 nm. A brown pigment such as a benzimidazolone pigment has a property of transmitting a certain amount of light having a wavelength of 675 nm, and has a property of not transmitting light having a wavelength of 425 nm. Therefore, by specifying the transmittance of light at a wavelength of 425 nm and the transmittance of light at a wavelength of 675 nm in the light transmittance test, the content of brown pigments such as benzimidazolone pigments and the content of phthalocyanine pigments The content ratio with the amount can be specified.

In addition, the measuring method of the transmittance | permeability of said infrared rays transparent dark ink can be measured with the following method, for example. The infrared transparent dark ink 5 g / ^{m 2} of hardening agent is contained on a white PET (188 [mu] m) was gravure coating, a polyethylene (60 [mu] m) was laminated thereon, 45 ° C. 55 ℃ or more or less, the aging process of 168 hours A back protective sheet is prepared by overheating and curing. And the sample of the transmittance | permeability of the pigment of a measurement sample (as an example) of the solution which peeled polyethylene and white PET of a back surface protection sheet, and melt | dissolved the infrared transmission dark color layer (infrared transmission dark ink) using methyl ethyl ketone The concentration is about 0.01 g or more and 0.5 or less for pigment with respect to 100 g of methyl ethyl ketone. A measurement sample is injected into a quartz glass cell, and a spectrophotometer (for example, UV spectrophotometer “V-670” manufactured by JASCO Corporation or “U-4100” manufactured by Hitachi High-Technologies Corporation) is used with a wavelength of 300 nm to By measuring the transmittance (%) of light at 1200 nm and determining the transmittance of light at a wavelength of 425 nm and light at a wavelength of 675 nm, the content of the brown pigment in the infrared transmissive dark ink can be estimated.

  The main resin of the infrared transmissive dark ink includes component (A) aliphatic polycarbonate diol compound (hereinafter also simply referred to as component (A)) and component (B) diisocyanate compound (hereinafter also simply referred to as component (B)). Both ends of the polycarbonate polyurethane formed by urethane bonding are glycol-modified by reaction with a specific amount of component (C) alkylene diol compound (hereinafter also simply referred to as component (C)), and further, a specific amount of component (D) in the molecule. (E) glycol-modified polycarbonate obtained by reacting with a modified isocyanate compound having three or more isocyanate groups (hereinafter also simply referred to as “modified isocyanate compound” or simply “component (D)”) to increase the molecular weight. The main component is polyurethane (hereinafter also simply referred to as component (E)).

  The main component resin may be the above component (E) alone, or if necessary, other conventionally known binder resins may be used in combination in the solid content of the main component in a range of usually 50% by mass or less. Other binder resins include polyurethane, polyamide, nitrocellulose, polyacrylic ester, polyvinyl chloride, copolymers of vinyl chloride and vinyl acetate, chlorinated polypropylene, styrene butadiene rubber, epoxy resins, rosin resins, ketone resins, etc. .

  The infrared transmissive dark ink preferably contains a curing agent so that the dark color layer 62 is firmly bonded to the surface of the base resin layer 11. The blend ratio of the main agent and the curing agent is preferably such that the ratio of (isocyanate group derived from polyisocyanate compound) / (hydroxyl group derived from polyurethane diol compound) is in the range of 1.0 to 3.5.

  It is preferable to add a solvent component to the main resin in order to obtain good coatability and handling suitability. Examples of such solvent components include aromatic solvents such as benzene, toluene and xylene; ester solvents such as ethyl acetate and butyl acetate; alcohol solvents such as methanol, ethanol, isopropanol and n-butanol; acetone, methyl ethyl ketone and methyl Ketone solvents such as isobutyl ketone; ether solvents such as tetrahydrofuran; polyhydric alcohol solvents such as ethylene glycol monomethyl ether and ethylene glycol monoethyl ether; amide solvents such as dimethylformamide; sulfoxides such as dimethyl sulfoxide Solvent; and a mixed solvent of two or more of these. Among these, preferred are acetone, methyl ethyl ketone, ethyl acetate, butyl acetate, tetrahydrofuran, toluene, xylene, methanol, ethanol, isopropyl alcohol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, and a mixed solvent of two or more thereof. It is.

[Base resin layer]
Examples of the material resin for forming the base resin layer 11 include fluorine resins such as PTFE (polytetrafluoroethylene) and ETFE (tetrafluoroethylene / ethylene copolymer), poly (meth) acrylic resins, and PET (polyethylene). A resin sheet such as a polyester resin such as terephthalate can be preferably used.

  The base resin layer 11 is, for example, a single-layer sheet that can exhibit a function as a reflective layer, or a single-layer sheet that exhibits such a reflective function, and other transparent resins that do not inhibit light transmission It may be a multilayer sheet formed by laminating layers and the like. By using any one of the layers as a reflective layer, the near-infrared light transmitted through the infrared-transmissive dark color layer 12 is reflected to contribute to power generation, thereby improving the power generation efficiency of the retreat battery module. When the outermost layer is a reflective layer, the above-described power generation efficiency improvement effect can be expressed by making each of the inner layers on the light receiving surface side transparent layers that "transmit all rays". . In the present specification, “transmitting all light” means that the total light transmittance is 80% or more. Further, when the inner layer is a reflective layer, a desired design can be imparted to the solar cell module 10 with the outer layer as an arbitrary dark layer. In this case, it is also preferable that the outer layer side base resin layer 113 is a weather resistant layer particularly strengthening hydrolysis resistance, solvent resistance, various barrier properties and the like required according to the use environment. For example, a fluorine resin layer typified by ETFE, a resin sheet made of hydrolysis-resistant PET, or the like can be given as a preferable example of this weather-resistant layer.

(Reflective layer)
In the case where at least part or all of the base resin layer 11 is configured as a reflective layer, the reflective layer is preferably a layer that reflects at least near infrared rays of 750 nm to 1500 nm.

  The reflective layer that reflects near infrared rays is, for example, a white resin sheet in which the material resin of the base resin layer contains a white pigment, or a coat layer (coating film or print film) containing a white pigment as a base resin layer. It can comprise by forming in the surface of.

  The reflective layer needs to have a function of reflecting near infrared rays. Therefore, it is preferable to use a white resin layer containing a white pigment having a particle size of 0.5 μm or more and 1.5 μm or less, and more preferably a particle size of 0.8 μm or more and 1.2 μm or less. In the reflective layer, the white pigment particles having a particle size of 0.8 μm or more and 1.2 μm or less are preferably 80% by mass or more of the particles of all white pigments. By setting the particle size and distribution ratio of the white pigment in the above range, the white resin layer efficiently reflects near-infrared rays. Therefore, the white pigment contributes to the improvement in power generation efficiency of the solar cell module. Reflecting near infrared rays preferably has an average reflectance of 40% or more, more preferably 60% or more in a wavelength region of about 1000 nm to 1200 nm.

[Transparent resin film layer]
The transparent resin film layer 13 should just be a layer which permeate | transmits near infrared rays and visible light with the transmittance | permeability which does not inhibit the designability requested | required of a solar cell module, for example, polyolefin resin, such as polyethylene resin and a polypropylene resin, polyethylene Terephthalate (PET) can be used. In particular, when the transparent resin film layer 13 is disposed as a layer for ensuring adhesion with a sealing material for a solar cell module, ethylene-vinyl acetate alcohol copolymer resin (EVA resin), polyethylene, or the like It is preferable to use an olefin resin.

[Production method of infrared transmitting protective sheet]
The infrared transmitting protective sheet 1 is formed by, for example, forming an infrared transmitting dark color layer 12 and an infrared transmitting dark ink on the surface of the base resin layer 11 by a printing method or the like, and further drying a transparent resin film layer 13 thereon. It can manufacture by integrating by laminating. The adhesive used in the dry laminating method is preferably a transparent adhesive or a dark color adhesive having infrared transparency containing the above dark pigment.

  Further, in the production of the infrared transmitting protective sheet 1, by performing the correction method of the present invention, which will be described in detail below, including the step of correcting the above-described defect portion 14, an inevitable resin material is obtained. A decrease in quality or productivity due to defects can be avoided.

<Infrared transparent protective sheet correction method>
As described above, the infrared transparent protective sheet 1 described above is a resin that forms each layer in the generation of the defect portion 14 in any resin layer that forms the infrared transparent protective sheet 1 as shown in FIG. As described above, it is extremely difficult to completely eliminate the sheet in the sheet forming stage.

  As a method for correcting the defect portion, it is conceivable to apply black correction ink on the surface of the transparent resin film layer at a horizontal position where the defect portion 14 is concealed in a plan view. However, for example, when this is performed with a general black ink containing a general-purpose pigment such as carbon ink, carbon black absorbs infrared rays, so that the correction portion 121 is formed thereby. In this case, the infrared transmittance of the infrared transmissive dark color layer 12 is hindered at this portion, so that it does not function at all. Also, in terms of design, the color of the infrared transmissive dark color layer 12 is usually a dark color that is slightly closer to any color than the black color of carbon black. Since a color difference occurs between a part and another part, the original design cannot be sufficiently restored even by correction.

Therefore, in the correction method of the present invention, an infrared transmissive correction ink comprising the same infrared transmissive pigment as that contained in the infrared transmissive dark color layer 12 is used instead of carbon black which is a general black ink. The surface of the transparent resin film layer was applied in such a manner as to cover the defect portion 14. In the present specification, “in a covering manner” does not necessarily mean that the covering portion is directly covered, and as described above, the correction portion 121 is positioned in a horizontal position where the defect portion 14 is hidden in plan view. It is used in the meaning including all aspects of forming.
The method of applying the infrared transmissive correction ink is not particularly limited, but is not particularly limited as long as it can be applied only to a necessary portion with a point. For example, application by a cotton swab, a needle or the like, or application by a spray or the like can be given as a preferred specific example. The correction part 121 formed in this way can recover the design of the infrared transparent protective sheet 1 without hindering the infrared transmission of the infrared transparent dark color layer 12 in the defect part 14.

  In addition, the infrared transmitting correction ink is manufactured by preparing the same base resin and curing agent as those used in preparing the infrared transmitting ink described above in addition to the above infrared transmitting pigment. Can do. However, the blocking resistance of the corrected portion can be enhanced by using a highly volatile solvent such as MEK as necessary.

  In addition, when the transparent resin film layer 13 is not a completely transparent layer but has a light transmittance that affects the visibility of the infrared transparent dark color layer 12, the influence is incorporated into the infrared transmission layer. It is more preferable to finely correct the color of the property correcting ink. For example, when the transparent resin film layer 13 is a translucent resin film having a high haze value, the infrared transmissive dark color layer 12 is blurred in the direction of white turbidity through the film. By adding a small amount of white pigment such as, it is also possible to unify the appearance color.

  According to the method for correcting an infrared transparent protective sheet and the method for manufacturing an infrared transparent protective sheet of the present invention described above, the following effects can be obtained.

  (1) The correction ink used for the correction of the infrared transmitting protective sheet 1 was a dark ink in which an infrared transmitting pigment contained in the dark ink constituting the infrared transmitting dark color layer 12 was prepared. Thereby, the correction part 121 applied and formed on the surface of the transparent resin film layer 13 for repairing the defect part 14 only recovers the deterioration of the design property due to the fine defect (defect part 1) of the resin layer. In addition, the infrared transmission function in the correction unit 121 can also be recovered.

  (2) The infrared transmitting pigment is made of a predetermined organic pigment or a combination thereof. Thereby, the correction method of the infrared transparent protective sheet as described in (1) can be applied to various types of infrared transparent protective sheets 1.

  (3) The infrared transmitting pigment was a dark pigment composed of a brown pigment and a phthalocyanine pigment. In particular, the infrared transmissive dark color layer constituted by the combination of the above pigments, which is a dark pigment excellent in infrared transmissive properties, is repaired by applying the method for correcting an infrared transmissive protective sheet described in (1) or (2). be able to.

  (4) The transparent resin film layer 13 was an olefin resin layer. Olefin-based resins such as EVA and polyethylene tend to generate a relatively large amount of fish eyes due to an increase in unmelted materials during film formation, rather than polyester-based resins such as PET. Therefore, when the transparent resin film layer 13 is an olefin resin layer, the method of the present application exhibits its effect particularly effectively.

  (5) According to the manufacturing method including the step of correcting the defective portion of the resin film by the correction method according to any one of (1) to (4), the occurrence of the material resin sheet at the film forming stage is unavoidable. Thus, the yield of non-defective products due to fine defects in the resin layer can be avoided and the productivity of the infrared transparent protective sheet can be significantly improved.

  As mentioned above, according to the correction method of the infrared transparent protective sheet of this invention, and the manufacturing method of an infrared transparent protective sheet, for example, in the infrared transparent protective sheet which can be used for the back surface protective sheet for solar cell modules It can be seen that by providing a method for correcting a defect part inevitably generated in the resin layer in the manufacturing stage, it is possible to contribute to the improvement of the quality and productivity of the infrared transmitting protective sheet.

DESCRIPTION OF SYMBOLS 1 Infrared transparent protective sheet 11 Base resin layer 12 Infrared transparent dark layer 121 Correction part 13 Transparent resin film layer 14 Defect part 2 Transparent front substrate 3, 5 Sealing material 4 Solar cell element 10 Solar cell module

Claims (5)

An infrared transmitting protective sheet having a configuration comprising an infrared transmitting dark layer containing an infrared transmitting pigment and a transparent resin film layer laminated on the surface of the infrared transmitting dark layer, ,
Infrared transmittance comprising the infrared transparent pigment on the surface of the transparent resin film layer in a mode of covering a defect formed in any one of the infrared transparent dark layer and / or the transparent resin film layer A correction method for applying correction ink. The infrared transmitting pigment is one or more pigments selected from phthalocyanine pigments, dioxazine pigments, isoindoline pigments, quinacridone pigments, and brown pigments,
The brown pigment is benzimidazolone pigment, 4-[(2,5-dichlorophenyl) azo] -3-hydroxy-N- (2,5-dimethoxyphenyl) -2-naphthalenecarboxamide, 1-[(4 -Nitrophenyl) azo] -2-naphthalenol, bis [3-hydroxy-4- (phenylazo) -2-naphthalenecarboxylic acid] copper salt, C.I. I. Pigment Brown 7, N, N′-bis (2,4-dinitrophenyl) -3,3′-dimethoxy-1,1′-biphenyl-4,4′-diamine, 3,4,9,10-perylenetetracarboxylic sun Diimide, Δ2,2 ′ (1H, 1′H) -binaphtho [2,1-b] thiophene-1,1′-dione and N, N ′-(10,15,16,17-tetrahydro-5,10 , 15,17-tetraoxo) -5H-dinaphtho [2,3-a: 2′3′-i] carbazole-4,9-diyl) bis (benzamide). The method for correcting an infrared transmitting protective sheet according to claim 1.   The method for correcting an infrared transparent protective sheet according to claim 1 or 2, wherein the infrared transparent pigment is a dark pigment composed of the brown pigment and the phthalocyanine pigment.   The infrared transparent protective sheet correcting method according to any one of claims 1 to 3, wherein the transparent resin film layer is an olefin resin layer.   The manufacturing method of the infrared rays transparent protective sheet for solar cell modules which includes the process of correcting the said defect | deletion part by the correction method in any one of Claim 1 to 4.

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