Colored solar module and method for manufacturing same

Abstract

A colored solar module according to one embodiment of the present invention comprises a substrate and a color coating layer, wherein: the substrate includes a lower protective layer, a power generation layer, which is formed on the lower protective layer and includes an encapsulant and a plurality of solar cells embedded in the encapsulant, and an upper protective layer formed on the power generation layer, the upper protective layer including a first surface that faces the outside and includes a first uneven part, and a second surface located on the opposite side of the first surface; and the color coating layer is formed on the first surface of the upper protective layer and is exposed to the outside.

Description

Color solar module and method for manufacturing same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0049524, filed April 12, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a color solar module and a method for manufacturing the same. Specifically, the present invention relates to a color solar module and a method for manufacturing the same, which maintains excellent light transmittance and color reproducibility while improving durability and weather resistance.

[0004] With the growing importance of environmental issues, clean energy sources such as hydroelectric power, wind power, and solar power are gaining attention. Among these, solar power, which utilizes the sun's inexhaustible energy source, is attracting extensive research due to its potential to combat global warming.

[0005] Solar cells, which utilize semiconductors such as monocrystalline silicon, polycrystalline silicon, and amorphous silicon, are practical applications of the principle that semiconductors emit current when illuminated by sunlight. Solar cells typically include solar cell modules, which are manufactured by securing solar cell elements (such as silicon, gallium-arsenide, or copper-indium-selenide) with a transparent top layer and a substrate layer. The top layer is typically made of glass, but glass's use as a building exterior is limited because the solar cells within are visible. Therefore, colored glass is often used as the top layer to enhance aesthetic appeal and enhance building exteriors. However, this results in lower power generation efficiency compared to transparent glass. Furthermore, for building exteriors, a matte finish requires low surface reflectivity. To achieve this, a colored coating layer is placed on the outside of the glass surface, allowing exposure to the outdoors. However, exposure to the outside can damage the colored coating, potentially compromising durability and weatherability.

[0006] The present invention is intended to solve these problems, and the purpose of the present invention is to provide a color solar module that has excellent light transmittance and a variety of colors, while improving the weather resistance and durability of the color coating layer and providing a matte feel, so that it can be suitably used as an exterior material for buildings, and a method for manufacturing the same.

[0007] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0008] A color solar module according to one embodiment of the present invention includes a substrate and a color coating layer, wherein the substrate includes a lower protective layer, a power generation layer formed on the lower protective layer and including a sealing material and a plurality of solar cell cells embedded in the sealing material, and an upper protective layer formed on the power generation layer, wherein the upper protective layer includes a first surface facing outward and including a first unevenness, and a second surface located on an opposite side of the first surface, and the color coating layer is formed on the first surface of the upper protective layer and is exposed to the outside.

[0009] The upper protective layer may be a low-iron glass substrate.

[0010] The above color coating layer may include a light-transmitting pigment.

[0011] The above color coating layer can be formed from a coating composition for a color solar module including polysilazane, a light-transmitting pigment, a metal catalyst compound, and two or more types of solvents.

[0012] The second surface may include a second protrusion having a different shape from the first protrusion.

[0013] A method for manufacturing a color solar module according to another embodiment of the present invention includes the steps of: washing a substrate including a first surface on which first unevenness is formed; preparing a coating composition for a color solar module including polysilazane, a light-transmitting pigment, a metal catalyst compound, and two or more solvents; applying the coating composition for a color solar module onto the first surface to form a color coating layer; performing a first heat treatment on the color coating layer; and performing a second heat treatment on the color coating layer that has undergone the first heat treatment at a temperature higher than the temperature of the first heat treatment.

[0014] The above first heat treatment can be performed at a temperature of 200°C to 250°C for 10 to 30 minutes.

[0015] The above secondary heat treatment can be performed at a temperature of 700°C to 800°C for 5 to 10 minutes.

[0016] The solvent may include two or more selected from dipropyl ether, dibutyl ether, diethyl ether, dipentyl ether, dihexyl ether, anisole, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, 2-methoxyethyl acetate, benzene, toluene, xylene, ethylbenzene, diethylbenzene, trimethylbenzene, triethylbenzene, ethylcyclohexane, methylcyclohexane, cyclohexane, methyl isobutyl ketone, and methyl ethyl ketone.

[0017] The solvent may include a first solvent selected from dipropyl ether, dibutyl ether, diethyl ether, dipentyl ether, dihexyl ether, and anisole, and a second solvent selected from propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and 2-methoxyethyl acetate.

[0018] The solvent may be included in a proportion of 70 to 98 parts by weight based on 100 parts by weight of the total composition, the first solvent may be included in a proportion of 30 to 60 parts by weight based on 100 parts by weight of the solvent, and the second solvent may be included in a proportion of 20 to 40 parts by weight based on 100 parts by weight of the solvent.

[0019] The metal element included in the above metal catalyst compound may be at least one selected from palladium, nickel, titanium, platinum, rhodium, cobalt, iron, iridium, aluminum, ruthenium, rhenium, and tungsten.

[0020] The above metal catalyst compound may be included in a proportion of 0.1 to 1.5 parts by weight based on 100 parts by weight of the total composition.

[0021] The above polysilazane may be included in a ratio of 10 to 20 parts by weight based on 100 parts by weight of the total composition.

[0022] The above light-transmitting pigment may be included in a proportion of 1 to 10 parts by weight based on 100 parts by weight of the total composition.

[0023] The above-mentioned substrate comprises a lower protective layer, a power generation layer formed on the lower protective layer and including a sealing material and a plurality of solar cell cells embedded in the sealing material, and an upper protective layer formed on the power generation layer, wherein the first surface may be one surface of the upper protective layer facing outward.

[0024] The upper protective layer may be a low-iron glass substrate.

[0025] According to one embodiment of the present invention, a color solar module that provides excellent light transmittance and a variety of colors while improving weather resistance and durability of a color coating layer and providing a matte feel, and is suitable for use as an exterior material for buildings, and a method for manufacturing the same can be provided.

[0026] FIG. 1 is a cross-sectional view illustrating an example of a color solar module according to one embodiment of the present invention.

[0027] FIG. 2 is a cross-sectional view illustrating an example of a color solar module according to another embodiment of the present invention.

[0028] Figure 3 is a flowchart showing a method for manufacturing a color solar module according to one embodiment of the present invention.

[0029] Figure 4 is a graph showing the results of measuring the transmittance for a glass substrate on which a color coating layer of an example and a comparative example is formed.

[0030] Figure 5 is a graph showing the results of measuring reflectance for glass substrates on which color coating layers of examples and comparative examples are formed.

[0031] The terms first, second, and third, etc., are used to describe, but are not limited to, various parts, components, regions, layers, and / or sections. These terms are used only to distinguish one part, component, region, layer, or section from another part, component, region, layer, or section. Accordingly, a first part, component, region, layer, or section described below may be referred to as a second part, component, region, layer, or section without departing from the scope of the present invention.

[0032] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used herein, the singular forms "singular" and "comprising" include plural forms as well, unless the context clearly dictates otherwise. The word "comprising" as used herein specifies a particular feature, region, integer, step, operation, element, and / or component, but does not exclude the presence or addition of other features, regions, integers, steps, operations, elements, and / or components.

[0033] When a part is referred to as being "on" or "over" another part, it can be directly on or over the other part, or there may be other parts intervening. Conversely, when a part is referred to as being "directly on" another part, there are no other parts intervening.

[0034] Although not defined otherwise, all terms, including technical and scientific terms, used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or overly formal unless otherwise defined.

[0035] In the present invention, the terms "emissivity" and "transmittance" are used as commonly known in the art. "Emissivity" is a measure of how much light at a given wavelength is absorbed or reflected. It generally satisfies the following equation:

[0036] (Emissivity) = 1 - (Reflectivity)

[0037] For architectural purposes, emissivity values ​​in the infrared spectrum from about 2500 to 50000 nm are important.

[0038] The term “transmittance” in this specification means visible light transmittance.

[0039] Although not defined otherwise, all terms, including technical and scientific terms, used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries are further interpreted to have meanings consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or overly formal unless otherwise defined.

[0040] Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement them. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0041] Hereinafter, a color solar module according to one embodiment of the present invention will be described with reference to FIG. 1.

[0042] FIG. 1 is a cross-sectional view illustrating an example of a color solar module according to one embodiment of the present invention.

[0043] Referring to FIG. 2, a color solar module (100) may include a substrate (120) and a color coating layer (110) formed thereon.

[0044] The substrate (110) may include a lower protective layer (10), an upper protective layer (30), and a power generation layer (20) included therebetween, wherein the power generation layer (20) may include a sealing material (22) and a plurality of solar cells (21) embedded within the sealing material (22). The lower protective layer (10) may be made of glass or a backsheet depending on the type of solar module, and the upper protective layer (30) may generally be made of glass. As the sealing material (22), a general-purpose bonding material capable of bonding the lower protective layer (10) and the upper protective layer (30) may be applied.

[0045] The upper protective layer (30) is a layer disposed on the outermost side of the substrate (110), and may include a first surface (31) facing outward and a second surface (32) located on the opposite side of the first surface. A first unevenness (310) is formed on the first surface (31). A pattern may be formed on the upper protective layer (30) by the first unevenness (310), and this pattern causes diffuse reflection on the first surface (31), so that the upper protective layer (30) is expressed as having a matte texture, and can be more appropriately used as an exterior material of a building. At this time, the upper protective layer (30) may be, for example, low-iron patterned glass. Meanwhile, the pattern formed by the first unevenness (310) may have various shapes and is not particularly limited.

[0046] The color coating layer (120) is formed on the upper part of the substrate, that is, on the first surface (31) of the upper protective layer (30). The color coating layer (120) can be formed by applying a coating composition on the first surface (31). At this time, since the first unevenness (310) is formed on the first surface (31), the contact area with the coating composition for forming the color coating layer (120) can be increased, and thus the durability and weather resistance of the color coating layer (120) can be improved. In particular, in the past, in color solar modules, a low-iron glass substrate for solar power was mainly used for the upper protective layer, but in this case, it was not easy to secure sufficient durability for exposing the coating surface to the outside while satisfying all of the effects such as high efficiency and a matte texture. However, in the case of a color solar module according to one embodiment of the present invention, since a pattern by the first unevenness (310) is formed on the surface where the color coating layer (120) is formed, the contact surface with the color coating layer (120) is expanded to improve durability, and furthermore, a matte texture can be formed through diffuse reflection by the first unevenness (310). In addition, when the upper protective layer (30) on which the first unevenness (310) is formed in this way is used for a solar module, components such as solar cell (21) arranged under the upper protective layer (30) can be prevented from being visible to the outside, so that various patterns can be implemented, and since it is excellent in aesthetics, it can be suitably used as an exterior material of a building. In addition, by further using a specific composition as the coating composition forming the color coating layer (120), the durability and weather resistance of the color coating layer (120) itself can also be improved.

[0047] That is, the coating composition forming the color coating layer (120) may include polysilazane, a light-transmitting pigment, a metal catalyst compound, and two or more solvents. By using such a composition, a color coating layer (120) with high durability and weather resistance can be formed without yellowing even after undergoing high-temperature heat treatment.

[0048] The color coating layer (120) formed by applying such a coating composition may be a silica film containing a light-transmitting pigment, and may have excellent durability and weather resistance. In particular, as illustrated in FIG. 1, it is positioned at the outermost side of the color solar module (100) and configured to be exposed to the outdoor environment when the color solar module (100) is used as an exterior material, etc., and thus, since an additional protective layer does not need to be formed on the outside of the color coating layer (120) in the color solar module (100), a color solar module (100) that is matte while having excellent light transmittance and color reproducibility can be implemented. In addition, since it has excellent durability and weather resistance, it can be suitably used as an exterior material for a building, etc. Furthermore, in one embodiment of the present invention, since the color coating layer (120) is formed on the first surface (31) on which the first unevenness (310) is formed as described above, the contact surface with the color coating layer (120) can be expanded to improve durability, and a matte texture can be more reliably implemented through diffuse reflection by the first unevenness (310).

[0049] Hereinafter, a coating composition that can be used in the manufacture of a color coating layer (120) when manufacturing the above-described color solar module (100) will be described. That is, the coating composition for the manufacture of the color coating layer (120) may include polysilazane, a light-transmitting pigment, a metal catalyst compound, and two or more types of solvents.

[0050] Polysilazane is a polymer compound having a -Si-N-Si- bond. When polysilazane is converted to silica through heat treatment, a silica film is formed. Compared to other silica precursors, polysilazane can produce a silica film with excellent hardness, durability, and adhesiveness. The weight average molecular weight of polysilazane is preferably 2,000 to 300,000 g / mol. When the weight average molecular weight is less than 2,000 g / mol, hardness and durability are reduced, and when it exceeds 300,000 g / mol, processability and coatability may actually be reduced.

[0051] Polysilazane is preferably used in a ratio of 10 to 20 parts by weight based on 100 parts by weight of the total composition. If the content is less than 10 parts by weight, the strength and durability of the coating film may decrease, and if it exceeds 20 parts by weight, the thickness of the coating film may increase, resulting in a decrease in transmittance.

[0052] Light-transmitting pigments can enhance the energy conversion efficiency of solar cells by simultaneously expressing color through the reflection of sunlight and transmitting sunlight. By using light-transmitting pigments, it is possible to impart various colors to the coating film while maintaining excellent light transmittance. In addition, light-transmitting pigments have the advantage of excellent processability due to a wide range of usage, and can be used in wet processes, so they are excellent in mass production and have a simple manufacturing process. Light-transmitting pigments are substances in the form of white particles and have the characteristic of expressing color better when coated on black sheets than on white sheets. Light-transmitting pigments are plate-shaped particles, and when the plate-like surface rises, it can express pearlescent effects and colors depending on the refractive index of the coated surface.

[0053] The light-transmitting pigment may include one or more particles selected from mica, alumina, silica, and glass flakes, and a metal oxide layer coated on the surface of the particles. Here, the particles are preferably plate-shaped, and the metal oxide layer may be formed by coating a metal oxide on the surface of the particles. In this case, titanium dioxide (TiO2) may be used as the metal oxide. The light-transmitting pigment exhibits a unique color and luster as the refractive index of light varies depending on the coating thickness of the metal oxide.

[0054] The particle size (average particle diameter) of the light-transmitting pigment is preferably 2 to 100 μm. A particle size less than 2 μm or greater than 100 μm is not preferable because it may result in poor processability. In addition, by using two types of particles with different particle sizes as the light-transmitting pigment, various colors can be expressed.

[0055] It is preferable that the above-mentioned light-transmitting pigment be included in a ratio of 1 to 10 parts by weight based on 100 parts by weight of the total composition. If the content is less than 1 part by weight or more than 10 parts by weight, the processability deteriorates and the transmittance decreases, which is not preferable.

[0056] The solvent may include two or more different solvents. That is, the solvent may be selected from compounds capable of dissolving polysilazane. In this case, it is preferable to use two or more solvents rather than a single solvent to control the evaporation rate and reduce harmful effects on the human body.

[0057] Usable solvents include aromatic compounds such as benzene, toluene, xylene, ethylbenzene, diethebenzene, trimethylbenzene, and triethylbenzene; alicyclic hydrocarbon compounds such as ethylcyclohexane, methylcyclohexane, and cyclohexane; ether compounds such as dipropyl ether, dibutyl ether, diethyl ether, dipentyl ether, dihexyl ether, and anisole; acetic acid ether compounds such as propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and 2-methoxyethyl acetate; and ketone compounds such as methyl isobutyl ketone and methyl ethyl ketone.

[0058] Among these, it is more preferable to use an ether compound and an acetic acid ether compound in combination. That is, it is preferable to select an ether compound as the first solvent and an acetic acid ether compound as the second solvent and use them as a mixture.

[0059] The solvent is preferably included in an amount of 70 to 98 parts by weight based on 100 parts by weight of the total composition. If it is less than 70 parts by weight or more than 98 parts by weight, processability is deteriorated, which is not preferred. In particular, when the first solvent and the second solvent are used in combination, it is preferable to use 30 to 60 parts by weight of the first solvent and 20 to 40 parts by weight of the second solvent based on 100 parts by weight of the total solvent. When the first solvent and the second solvent are included in such a ratio, even if the coating layer is exposed to a high-temperature strengthening process during the manufacturing process of the color coating layer described below, yellowing can be prevented.

[0060] The metal catalyst compound is a component included to promote curing of the coating film when curing the coating composition, and can promote curing of the coating film within a short period of time during high-temperature heat treatment, particularly to improve durability and weather resistance, as described below.

[0061] As a metal catalyst compound, any metal element capable of promoting the curing reaction of the coating film may be appropriately selected and used. Specifically, the metal element contained in the metal catalyst compound may include at least one selected from palladium, nickel, titanium, platinum, rhodium, cobalt, iron, iridium, aluminum, ruthenium, rhenium, and tungsten. The metal catalyst compound containing such a metal element preferably includes a ligand selected from an acetylacetonate group, a carbonyl group, and a carboxylate group. Here, the carboxylate group may be a residue of a carboxylic acid selected from formic acid, acetic acid, propionic acid, butyric acid, octanoic acid, lauric acid, stearic acid, oleic acid, and lactic acid. Specific examples of more preferred metal catalyst compounds include palladium (acetylacetonate), tris(acetylacetonate)aluminum, tris(acetylacetonate)iron, tris(acetylacetonate)rhodium, tris(acetylacetonate)cobalt, tris(acetylacetonate)ruthenium, bis(acetylacetonate)palladium, hexacarbonyltungsten, dodecacarbonyltriruthenium, dodecacarbonyldirenium, palladium acetate, palladium propionate, nickel benzoate, nickel octanoate, nickel oleate, iron formate, cobalt benzoate, cobalt citrate, cobalt formate, rhodium triacetate, rhodium tetraacetate, titanium oleate, aluminum gluconate, aluminum benzoate, and Aluminum butyrate can be mentioned. Among these, the metal catalyst compound can be selected considering characteristics such as coating film thickness and degree of curing, and a catalyst containing palladium is particularly preferred.

[0062] The metal catalyst compound may be included in a proportion of 0.1 to 1.5 parts by weight based on 100 parts by weight of the total composition. If it is less than 0.1 parts by weight, the effect of promoting the reaction during curing cannot be sufficiently obtained, and if it is more than 1.5 parts by weight, the storage stability of the coating composition is lowered, which is not preferable.

[0063] In addition, the coating composition for a color solar module of the present invention may additionally include various additives in addition to the above-described components to improve the properties of the composition and the coating film.

[0064] Hereinafter, a color solar module according to another embodiment of the present invention will be described with reference to FIG. 2.

[0065] FIG. 2 is a cross-sectional view illustrating an example of a color solar module according to another embodiment of the present invention.

[0066] As illustrated in FIG. 2, a color solar module according to another embodiment of the present invention is identical to the color solar module of the previously described embodiment except that it includes a second protrusion (320) on the second surface (32) of the upper protective layer (30), and therefore, a description of the overlapping configuration is omitted.

[0067] The upper protective layer (30) may further include a second protrusion (320) on the second surface (32) located on the inner side. Here, the second protrusion (320) may have a different shape from the first protrusion (310). By the second protrusion (320) formed on the second surface (32) in this way, not only can the adhesive strength between the upper protective layer (30) and the sealant (22) be improved, but also the second protrusion (320) can cause internal diffuse reflection so that the transmitted sunlight cannot escape to the outside but is trapped inside. By this, the sunlight trapped inside can be further used for power generation, so that the power generation efficiency can be further improved.

[0068] Hereinafter, a method for manufacturing a color solar module according to one embodiment of the present invention will be described with reference to FIG. 3.

[0069] Figure 3 is a flowchart showing a method for manufacturing a color solar module according to one embodiment of the present invention.

[0070] Specifically, the method includes the steps of: washing a substrate including a first surface on which first unevenness is formed; preparing a coating composition for a color solar module including polysilazane, a light-transmitting pigment, a metal catalyst compound, and two or more solvents; applying the coating composition for a color solar module onto the first surface to form a color coating layer; performing a first heat treatment on the color coating layer; and performing a second heat treatment on the color coating layer that has undergone the first heat treatment at a temperature higher than the temperature of the first heat treatment.

[0071] First, the substrate including the first surface on which the first unevenness is formed is washed (S10).

[0072] The step of washing the substrate is a step of removing dust, oil, organic compounds, contaminants, etc. from the first surface on which the color coating layer is formed, and the substrate can be heated to 600 to 700°C or washed with deionized water, alcohol, acidic or alkaline cleaning solution.

[0073] As a substrate, any material that requires a color coating layer can be used without limitation, and for example, it can be a film, sheet, or substrate made of glass, quartz, polyester such as polyethylene terephthalate, polyethylene naphthalate, polyamide, polycarbonate, polymethyl methacrylate, polystyrene, or the like. Alternatively, in order to form a solar module including solar cells, some of the plurality of layers constituting the substrate may include solar cells. In addition, in the present embodiment, patterned glass having a first unevenness formed on the outer surface, i.e., the first surface, of the upper protective layer of the substrate can be used.

[0074] Next, a coating composition for a color solar module containing polysilazane, a light-transmitting pigment, a metal catalyst compound, and two or more solvents is prepared (S20).

[0075] The coating composition for the color solar module used at this time can be prepared by including two or more solvents, as in the coating composition described above. The composition of each component of the specific composition is the same as described above, and thus is omitted here.

[0076] Next, a coating composition for a colored solar module is applied on the first surface of the substrate to form a colored coating layer (S30).

[0077] At this time, a known coating method can be used as a method for coating the coating composition, and examples thereof include bar coating, meniscus coating (dip coating), spray coating, roll coating, spin coating, and slot die coating.

[0078] The coating thickness of the color coating layer can be appropriately selected depending on the desired color and light transmittance, and can be, for example, 0.5 ㎛ to 3.0 ㎛.

[0079] Next, a first heat treatment is performed on the color coating layer (S40).

[0080] The first heat treatment is a process for drying the color coating layer, and can be performed at a temperature of 200°C to 250°C for 10 to 30 minutes. At this time, if the drying temperature is too low or the drying time is too short, drying may not be sufficient, and the quality of the manufactured film may not be uniform. In addition, if the drying temperature is too high or the drying time is too long, the process efficiency may decrease and the coating film may be damaged, which is not preferable. In addition, by performing the first heat treatment before the second heat treatment described below, the solvent can be removed before the high-temperature second heat treatment, and thus discoloration (yellowing) caused by the solvent during the second heat treatment can be prevented.

[0081] Next, for the color coating layer that has undergone the first heat treatment, a second heat treatment is performed at a higher temperature than the first heat treatment (S50).

[0082] The secondary heat treatment is a process for strengthening the color coating layer, and can be performed at a temperature of 700°C to 800°C for 5 to 10 minutes. Through this high-temperature strengthening process, the durability and weather resistance of the color coating layer can be improved. In particular, in the present embodiment, since this strengthening process is performed on a coating composition including two types of solvents and a metal catalyst compound as described above, the solvent can be quickly evaporated and the color coating layer can be quickly cured by the strengthening process, so that the durability of the color coating layer can be improved without discoloration even by the high-temperature secondary heat treatment. Since the color coating layer obtained by this process has greatly improved durability and weather resistance, it can be used in a state exposed to the external environment as an exterior material for buildings, and thus, it becomes possible to manufacture a color glass for solar modules with a matte feel and low surface reflection.

[0083]

[0084] Below, the present invention is described in more detail through experimental examples. However, these experimental examples are intended only to illustrate the present invention and are not intended to limit the present invention.

[0085] (Example 1)

[0086] After the patterned glass substrate was washed and dried using a glass washing machine, a coating composition was prepared containing 10 parts by weight of polysilazane, 2.5 parts by weight of a light-transmitting pigment, 77.38 parts by weight of dibutyl ether as a first solvent, 10 parts by weight of ethyl acetate as a second solvent, and 0.12 parts by weight of palladium acetylacetonate as a metal catalyst compound.

[0087] Here, low-iron patterned glass (mist, 3.2T) was used as the glass substrate, and Adamas A-901K (trade name) was used as the light-transmitting pigment.

[0088] The obtained coating composition was spray-coated on the glass substrate to form a color coating layer having a thickness of about 0.95 μm.

[0089] The obtained color coating layer was subjected to a primary heat treatment at 250°C for 30 minutes, followed by a secondary heat treatment at 700°C for 5 minutes, thereby forming a color coating layer on a glass substrate. The glass substrate including the obtained color coating layer was gray in color and exhibited a transmittance of 83%.

[0090] (Example 2)

[0091] A color coating layer was formed on a glass substrate in the same manner as in Example 1, except that the thickness of the color coating layer was approximately 1.90 μm. The glass substrate including the obtained color coating layer was gray and exhibited a transmittance of 75%.

[0092] (Example 3)

[0093] A color coating layer was formed on a glass substrate in the same manner as in Example 1, except that Adamas A-791K (trade name) was used as a light-transmitting pigment. The glass substrate including the obtained color coating layer was green and exhibited a transmittance of 83%.

[0094] (Example 4)

[0095] A color coating layer was formed on a glass substrate in the same manner as in Example 1, except that Adamas A-901K, Adamas A901S, and Adamas A-100D (all product names) were mixed and used as light-transmitting pigments. The glass substrate including the obtained color coating layer had a charcoal color and exhibited a transmittance of 75%.

[0096] (Comparative Example 1)

[0097] A color coating layer was formed under the same conditions as in Example 1, except that a low-iron glass without a pattern formed thereon (5T, the same as the total thickness of the patterned glass in Example 1) was used as the glass substrate.

[0098] (Comparative Example 2)

[0099] A color coating layer was formed under the same conditions as Example 2, except that low-iron glass (5T) without a pattern was used as the glass substrate.

[0100] (Comparative Example 3)

[0101] A color coating layer was formed under the same conditions as Example 3, except that low-iron glass (5T) without a pattern was used as the glass substrate.

[0102] (Comparative Example 4)

[0103] A color coating layer was formed under the same conditions as Example 4, except that low-iron glass (5T) without a pattern was used as the glass substrate.

[0104] (Comparative Example 5)

[0105] A color coating layer was formed under the same conditions as Example 1, except that a low-iron glass (3T) without a pattern was used as a glass substrate, a single solvent of dibutyl ether was included as a coating composition, and no metal catalyst compound was included.

[0106]

[0107] -Evaluation 1: Wear resistance evaluation

[0108] The results of evaluating the wear resistance of the color coating layers obtained in Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 1.

[0109] The abrasion resistance evaluation was conducted according to the KS L2014 hot-ray reflective glass test standard, and a Taber-type abrasion tester was used as the abrasion tester. The test conditions used were a horizontal rotary table rotating at a speed of 65±10 rotations per minute and a pair of abrasion wheels fixed and rotating at intervals of 65±3 mm. The abrasion wheels were made of rubber with a diameter of 45 to 50 mm and a thickness of 12.5 mm and medium hardness mixed with abrasive (Taber-type No. CS-10F). The test pieces were installed on the rotary table of the abrasion tester so that the color coating layer side was the abrasion surface, and the color coating layer was abraded by rotating the test pieces 200 times.

[0110] The transmittance (△TL) before and after wear was measured, and the results are shown in Table 1.

[0111] Change in transmittance before and after wear (△TL, %) Example 12.88 Comparative Example 13.38 Example 23.97 Comparative Example 24.88 Example 32.11 Comparative Example 33.78 Example 42.58 Comparative Example 44.05

[0112] As shown in Table 1, the examples showed a smaller difference in transmittance before and after the experiment compared to the comparative examples under the same conditions. Therefore, the examples demonstrated superior wear resistance and were thus suitable for application to color solar modules that are directly exposed to the outside and subject to physical damage.

[0113]

[0114] - Evaluation 2: Transmittance and Reflectance Evaluation

[0115] In Example 1, transmittance and reflectance were measured for the low-iron patterned glass (mist, 3.2T) before the color coating layer was formed, and in Comparative Example 1, the low-iron plain glass (3T) before the color coating layer was formed, and the results are shown in FIGS. 4 and 5 (since the optical performance of the substrate was the same before and after the formation of the color coating layer, the transmittance and reflectance were measured without the color coating layer being formed). FIG. 4 is a graph showing the results of measuring transmittance for the glass substrates of the Examples and Comparative Examples, and FIG. 5 is a graph showing the results of measuring reflectance for the glass substrates of the Examples and Comparative Examples.

[0116] Here, both transmittance and reflectance were measured using a Lambda 950 / 1050 spectrophotometer from Perkin Elmer.

[0117] As shown in FIGS. 4 and 5, it can be seen that both the transmittance and reflectance for light in the wavelength range of about 300 nm to 1100 nm are higher in the embodiment. That is, since it has high transmittance within the wavelength range of 300 nm to 1100 nm, which is a wavelength range commonly used in solar power generation, it can maximize the amount of sunlight incident from the outside, and since the indoor reflectance is high, it can prevent the transmitted light from escaping to the outside, resulting in improved solar power generation efficiency.

[0118]

[0119] - Evaluation 3: Evaluation of anti-yellowing effect

[0120] The color of the color coating layer obtained in Example 1 and Comparative Example 6 was compared to observe whether yellowing occurred. The results are shown in Table 2.

[0121] Table 2 shows the results of measuring color coordinates for Example 1 and Comparative Example 6.

[0122] La*b*Comparative Example 685.89-0.3911.64Example 185.83-0.054.83

[0123] As shown in Table 2, in Example 1, despite the second high-temperature heat treatment, the change in yellow value was small, whereas in Comparative Example 6, the yellow value was very high.

[0124] The present invention is not limited to the above-described embodiments, but can be manufactured in a variety of different forms. Those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

[0125] [Explanation of symbols]

[0126] 100: Color solar module

[0127] 110: Color coating layer

[0128] 120: Description

[0129] 10: Lower protective layer

[0130] 20: Power generation layer

[0131] 30: Upper protective layer

[0132] 31: First surface

[0133] 32: Second surface

[0134] 310: First bump

[0135] 320: Second bump

[0136] 21: Solar cell

[0137] 22: Bong Ji-jae

Claims

1. Including a base and color coating layer, The above-mentioned substrate comprises a lower protective layer, a power generation layer formed on the lower protective layer and including a sealing material and a plurality of solar cell cells embedded in the sealing material, and an upper protective layer formed on the power generation layer. The upper protective layer comprises a first surface facing outward and including a first protrusion, and a second surface located on the opposite side of the first surface, A color solar module in which the color coating layer is formed on the first surface of the upper protective layer and is exposed to the outside.

2. In paragraph 1, The upper protective layer is a color solar module made of a low-iron glass substrate.

3. In paragraph 1, The above color coating layer is a color solar module containing a light-transmitting pigment.

4. In paragraph 3, A color solar module, wherein the color coating layer is formed from a coating composition for a color solar module comprising polysilazane, a light-transmitting pigment, a metal catalyst compound, and two or more types of solvents.

5. In paragraph 1, A color solar module wherein the second surface includes a second protrusion having a different shape from the first protrusion.

6. A step of washing a substrate including a first surface on which a first unevenness is formed; A step of preparing a coating composition for a color solar module comprising polysilazane, a light-transmitting pigment, a metal catalyst compound, and two or more solvents; A step of forming a color coating layer by applying the coating composition for the color solar module on the first surface; A step of performing a first heat treatment on the above color coating layer; and A method for manufacturing a color solar module, comprising a step of performing a second heat treatment on the color coating layer that has undergone the first heat treatment at a temperature higher than the temperature of the first heat treatment.

7. In paragraph 6, A method for manufacturing a color solar module, wherein the above first heat treatment is performed at a temperature of 200°C to 250°C for 10 to 30 minutes.

8. In paragraph 6, A method for manufacturing a color solar module, wherein the above secondary heat treatment is performed at a temperature of 700°C to 800°C for 5 to 10 minutes.

9. In paragraph 6, A method for manufacturing a color solar module, wherein the solvent comprises two or more selected from dipropyl ether, dibutyl ether, diethyl ether, dipentyl ether, dihexyl ether, anisole, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, 2-methoxyethyl acetate, benzene, toluene, xylene, ethylbenzene, diethylbenzene, trimethylbenzene, triethylbenzene, ethylcyclohexane, methylcyclohexane, cyclohexane, methyl isobutyl ketone, and methyl ethyl ketone.

10. In paragraph 9, A method for manufacturing a color solar module, wherein the solvent comprises a first solvent selected from dipropyl ether, dibutyl ether, diethyl ether, dipentyl ether, dihexyl ether, and anisole, and a second solvent selected from propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and 2-methoxyethyl acetate.

11. In paragraph 10, The solvent is included in a proportion of 70 to 98 parts by weight based on 100 parts by weight of the total composition, The first solvent is included in a ratio of 30 to 60 parts by weight per 100 parts by weight of the solvent, A method for manufacturing a color solar module, wherein the second solvent is included in a ratio of 20 to 40 parts by weight per 100 parts by weight of the solvent.

12. In paragraph 6, A method for manufacturing a color solar module, wherein the metal element contained in the above metal catalyst compound is at least one selected from palladium, nickel, titanium, platinum, rhodium, cobalt, iron, iridium, aluminum, ruthenium, rhenium, and tungsten.

13. In paragraph 6, A method for manufacturing a color solar module, wherein the metal catalyst compound is included in a ratio of 0.1 to 1.5 parts by weight based on 100 parts by weight of the total composition.

14. In paragraph 6, A method for manufacturing a color solar module, wherein the above polysilazane is included in a ratio of 10 to 20 parts by weight based on 100 parts by weight of the total composition.

15. In paragraph 6, A method for manufacturing a color solar module, wherein the above light-transmitting pigment is included in a ratio of 1 to 10 parts by weight based on 100 parts by weight of the total composition.

16. In paragraph 6, The above-mentioned substrate comprises a lower protective layer, a power generation layer formed on the lower protective layer and including a sealing material and a plurality of solar cell cells embedded in the sealing material, and an upper protective layer formed on the power generation layer. A method for manufacturing a color solar module, wherein the first surface is one side of the upper protective layer facing outward.

17. In paragraph 16, The above upper protective layer is a method for manufacturing a color solar module which is a low-iron glass substrate.

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