High-efficiency color film for solar modules and manufacturing method thereof

Abstract

The present invention relates to a color film for a high-efficiency solar module and a method for manufacturing the same, and more specifically, to a color dispersion coated by mixing an organic pigment dispersion and a TiO2 dispersion, wherein the total light transmittance is 50% or more and the color difference (△E) with respect to a black sheet and a white sheet is 10 to 20, and to a color film for a high-efficiency solar module and a method for manufacturing the same.

Description

Technology Field

[0001] The present invention relates to a color film for a high-efficiency solar module and a method for manufacturing the same, and more specifically, to a color dispersion coated by mixing an organic pigment dispersion and a TiO2 dispersion, wherein the total light transmittance is 50% or more and the color difference (△E) with respect to a black sheet and a white sheet is 10 to 20, and to a color film for a high-efficiency solar module and a method for manufacturing the same. Background Technology

[0003] Along with energy conservation, countries around the world are striving to reduce greenhouse gases to combat global warming. As a countermeasure, new and renewable energy sources such as solar power are gaining prominence.

[0004] Generally, a photovoltaic power generation system is an assembly of multiple solar cell modules formed in the shape of panels on a support frame, connected in series or parallel; each solar cell module consists of solar cells and front / back films, and the solar cells convert the sun's light energy into electrical energy.

[0005] The wavelength range of light energy absorbed by commonly used silicon (Si)-based solar cells is the range of 300 to 1100 nm, and the cells absorb light energy in this wavelength range and convert it into electrical energy.

[0006] The installation of photovoltaic power generation systems on a building's windows, walls, and roofs to replace the materials constituting the building's exterior is referred to as a Building Integrated Photovoltaic (BIPV) system. Since the aforementioned BIPV is used as an exterior building material, design elements that can enhance the building's value are important.

[0007] However, the transparent coating film applied to the exterior of the BIPV described above is affected by the color of the solar cells located on the back, causing it to appear as the color of the solar cells, or the colors of the solar cells and the transparent coating film may mix, resulting in a problem where the original color cannot be recognized.

[0008] When applying a color coating film that has high haze like conventional paint but exhibits low transmittance, the overall transmittance is low, which significantly reduces the solar power generation efficiency, making it difficult to apply to solar modules.

[0009] In addition, when using reflective pigments such as pearl pigments, the color of the color coating layer is visible regardless of the color of the module, but the problem arises that the total light transmittance is reduced to less than 50%, making it unsuitable for use as a color layer on the front of a solar panel.

[0010] Due to the aforementioned issues, there is a need to develop a color film for solar modules that exhibits a high color difference when applied to solar cell modules so that a color distinct from the module can be identified visually without compromising design elements, while simultaneously displaying high transmittance. The problem to be solved

[0012] The objective of the present invention is to provide a high-efficiency color film for a solar module and a method for manufacturing the same, which, in order to solve the above-mentioned problems, exhibits a high color difference when applied to a solar cell module so that a color different from that of the solar cell module can be identified visually without degrading design elements, and simultaneously exhibits high transmittance.

[0013] In addition, the objective of the present invention is to provide a high-efficiency color film for a solar module having a total light transmittance of 50% or more and a color difference of 10 to 20 with respect to a black sheet and a white sheet, and a method for manufacturing the same.

[0014] The technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art from the description of the present invention. means of solving the problem

[0016] To achieve the above objective, the present invention provides a high-efficiency color film for solar modules and a method for manufacturing the same.

[0017] The present invention is a color film for a solar module coated with a color dispersion in which 2.6 to 4.6 parts by weight of an organic pigment dispersion, 0.2 to 0.6 parts by weight of a TiO2 dispersion, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluent solvent are mixed per 100 parts by weight of the color dispersion.

[0018] In the present invention, the size of the particles included in the organic pigment dispersion and the TiO2 dispersion is characterized by being 30 to 500 nm.

[0019] The present invention comprises the steps of: (S1) preparing an organic pigment dispersion; (S2) preparing a TiO2 dispersion; (S3) mixing 2.6 to 4.6 parts by weight of the organic pigment dispersion, 0.2 to 0.6 parts by weight of the TiO2 dispersion, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluent solvent relative to 100 parts by weight of the total mixture; and (S4) coating and drying the mixture onto a film.

[0020] In the present invention, the step of preparing the (S1) organic pigment dispersion comprises: (S1a) mixing 5 to 15 parts by weight of organic pigment, 58 to 78 parts by weight of methyl isobutyl ketone, 4 to 8 parts by weight of 2-ethoxyethanol, and 15 to 25 parts by weight of dispersant with respect to 100 parts by weight of mixed solution; and (S1b) adding 0.1 to 2.0 mm zirconia balls to the mixed solution and grinding and dispersing in a bead mill for 50 to 200 hours.

[0021] In the present invention, the step of preparing the (S2) TiO2 dispersion comprises: (S2a) mixing 10 to 30 parts by weight of TiO2, 60 to 80 parts by weight of methyl isobutyl ketone, and 5 to 15 parts by weight of a dispersant with respect to 100 parts by weight of a mixed solution; and (S2b) adding 0.1 to 2.0 mm zirconia balls to the mixed solution and grinding and dispersing in a bead mill for 50 to 200 hours.

[0022] The present specification will be described in more detail below. Effects of the invention

[0024] By means of the solution to the above problem, the present invention can provide a high-efficiency color film for a solar module and a method for manufacturing the same, which exhibits a high color difference when applied to a solar cell module so as not to degrade design elements, allowing a color different from that of the solar cell module to be identified with the naked eye, and simultaneously exhibits high transmittance.

[0025] In addition, the present invention can provide a high-efficiency color film for a solar module having a total light transmittance of 50% or more and a color difference of 10 to 20 with respect to a black sheet and a white sheet, and a method for manufacturing the same.

[0026] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims. Brief explanation of the drawing

[0028] Figure 1 is an image showing the results of a color difference test of a color film with a blue pigment applied according to an embodiment and a comparative example of the present invention. Figure 2 is a graph showing the total transmittance and direct transmittance of a color film with a blue pigment applied according to an embodiment and a comparative example of the present invention. Figure 3 is an image showing the results of a color difference experiment of a color film with red pigment and yellow pigment applied according to an embodiment and a comparative example of the present invention. Figure 4 is a graph showing the total transmittance and direct transmittance of color films to which red pigment and yellow pigment are applied according to the embodiments and comparative examples of the present invention. Specific details for implementing the invention

[0029] The terms used in this specification have been selected based on currently widely used general terms whenever possible, taking into account their functions in the present invention; however, these terms may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Additionally, in specific cases, terms have been arbitrarily selected by the applicant, and in such cases, their meanings will be described in detail in the corresponding description of the invention. Therefore, the terms used in this invention should be defined not merely by their names, but based on their meanings and the overall content of the invention.

[0030] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0031] Numerical ranges include the values ​​defined in the above ranges. All maximum numerical limits given throughout this specification include all lower numerical limits as clearly written. All minimum numerical limits given throughout this specification include all higher numerical limits as clearly written. All numerical limits given throughout this specification will include all better numerical ranges within a wider numerical range, as clearly written.

[0033] Color film for solar modules

[0034] The present invention relates to a color film for a solar module coated with a color dispersion comprising 2.6 to 4.6 parts by weight of an organic pigment dispersion, 0.2 to 0.6 parts by weight of a TiO2 dispersion, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluent solvent, all mixed per 100 parts by weight of the color dispersion. The organic pigment dispersion comprises 5 to 15 parts by weight of an organic pigment, 58 to 78 parts by weight of methyl isobutyl ketone, 4 to 8 parts by weight of 2-ethoxyethanol, and 15 to 25 parts by weight of a dispersant, all mixed per 100 parts by weight of the organic pigment dispersion. The TiO2 dispersion may comprise 10 to 30 parts by weight of TiO2, 60 to 80 parts by weight of methyl isobutyl ketone, and 5 to 15 parts by weight of a dispersant, all mixed per 100 parts by weight of the TiO2 dispersion.

[0035] The above TiO2 dispersion may preferably contain 0.4 parts by weight.

[0036] The color film for the solar module above may have a total transmittance of 50% or more at a range of 300 to 1100 nm, and a color difference (△E) of 10 to 20 when measuring the color between the color of the color film on a black sheet for color difference testing and the color of the color film on a white sheet for color difference testing. The general transmittance of the color film for the solar module above may be 80% or less compared to the total transmittance.

[0037] In the present invention, the size of the particles included in the pigment dispersion and the TiO2 dispersion may be 30 to 500 nm. If the size of the particles is 500 nm or larger, light may not be transmitted, and if it is 30 nm or smaller, light may not be scattered.

[0039] Method for manufacturing color film for solar modules

[0040] The present invention relates to a color film for a solar module coated with a color dispersion comprising 2.6 to 4.6 parts by weight of an organic pigment dispersion, 0.2 to 0.6 parts by weight of a TiO2 dispersion, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluent solvent, mixed relative to 100 parts by weight of the color dispersion.

[0041] The above TiO2 dispersion may preferably contain 0.4 parts by weight.

[0042] The color film for the solar module above may have a total transmittance of 50% or more at a range of 300 to 1100 nm, and a color difference (△E) of 10 to 20 when measuring the color between the color of the color film on a black sheet for color difference testing and the color of the color film on a white sheet for color difference testing. The general transmittance of the color film for the solar module above may be 80% or less compared to the total transmittance.

[0043] In the present invention, the size of the particles included in the pigment dispersion and the TiO2 dispersion may be 30 to 500 nm. If the size of the particles is 500 nm or larger, light may not be transmitted, and if it is 30 nm or smaller, light may not be scattered.

[0044] The present invention relates to a method for manufacturing a color film for a photovoltaic module, comprising: (S1) a step of preparing an organic pigment dispersion; (S2) a step of preparing a TiO2 dispersion; (S3) a step of mixing 2.6 to 4.6 parts by weight of the organic pigment dispersion, 0.2 to 0.6 parts by weight of the TiO2 dispersion, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluent solvent relative to 100 parts by weight of the total mixture; and (S4) a step of coating and drying the mixture onto a film.

[0045] In the case of the above organic pigment dispersion, the transmittance is reduced compared to when an inorganic pigment dispersion is used, but the original color can be expressed with less influence from the back sheet. If the above pigment dispersion is included in an amount of less than 2.6, the required color may not appear, and if the above dispersion is included in an amount of more than 4.6, the transmittance is low, making it difficult to apply to a solar module.

[0046] The above TiO2 dispersion may be mixed with the above organic pigment dispersion, the above adhesive resin, and the above diluting solvent, and may have a total transmittance of 50% or more at a range of 300 to 1100 nm, and a color difference (△E) of 10 to 20 when measuring the color between the color of the color film on a black sheet for color difference inspection and the color of the color film on a white sheet for color difference inspection. The above color film for the solar module may have a general transmittance of 80% or less relative to the total transmittance.

[0047] The color film for a solar module manufactured according to the above manufacturing method may be suitable for use as a color layer on the front surface of a solar panel.

[0048] In the present invention, the step of preparing the (S1) organic pigment dispersion may comprise: (S1a) mixing 5 to 15 parts by weight of organic pigment, 58 to 78 parts by weight of methyl isobutyl ketone, 4 to 8 parts by weight of 2-ethoxyethanol, and 15 to 25 parts by weight of dispersant with respect to 100 parts by weight of mixed solution; and (S1b) adding 0.1 to 2 mm zirconia balls to the mixed solution and grinding and dispersing in a bead mill for 50 to 200 hours. If the mixed solution is ground and dispersed for less than 50 hours, it may not be sufficiently ground and dispersed and may not be usable as a coating solution.

[0049] In the present invention, the step of preparing the (S2) TiO2 dispersion may comprise: (S2a) mixing 10 to 30 parts by weight of TiO2, 60 to 80 parts by weight of methyl isobutyl ketone, and 5 to 15 parts by weight of a dispersant with respect to 100 parts by weight of a mixed solution; and (S2b) adding 0.1 to 2 mm zirconia balls to the mixed solution and grinding and dispersing them in a bead mill for 50 to 200 hours. If the mixed solution is ground and dispersed for less than 50 hours, it may not be sufficiently ground and dispersed and may not be used as a coating solution.

[0051] Examples

[0052] The embodiments of the present invention are described in detail below, but it is obvious that the present invention is not limited by the following embodiments.

[0053] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described in detail below. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. The embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0055] Example 1. Blue color film

[0056] 10 parts by weight of a blue organic pigment, 68 parts by weight of methyl isobutyl ketone, 6 parts by weight of 2-ethoxyethanol, and 20 parts by weight of a dispersant were mixed with 100 parts by weight of a mixed solution. Zirconia balls with a size of 0.1 to 2.0 mm were added to the mixed solution and ground and dispersed in a bead mill for 50 hours to obtain a blue organic pigment dispersion.

[0057] Subsequently, 20 parts by weight of TiO2, 70 parts by weight of methyl isobutyl ketone, and 10 parts by weight of a dispersant were mixed with 100 parts by weight of the mixed solution. Zirconia balls with a size of 0.1 to 2.0 mm were added to the mixed solution and ground and dispersed in a bead mill for 50 hours to obtain a TiO2 dispersion.

[0058] Subsequently, 2.8 parts by weight of the obtained blue organic pigment dispersion, 0.4 parts by weight of the obtained TiO2 dispersion, 48.5 parts by weight of adhesive resin, and 48.5 parts by weight of dilution solution were mixed relative to 100 parts by weight of the color dispersion, coated with wire bar no. 6, and then dried to produce a blue color film.

[0060] Example 2. Red color film

[0061] A color film was prepared in the same manner as in Example 1, except that a red organic pigment was used.

[0063] Example 3. Yellow color film

[0064] A color film was prepared in the same manner as in Example 1, except that a yellow inorganic pigment was used.

[0066] Comparative Example 1. TiO 2 Blue color film that does not contain dispersion

[0067] 10 parts by weight of a blue organic pigment, 68 parts by weight of methyl isobutyl ketone, 6 parts by weight of 2-ethoxyethanol, and 20 parts by weight of a dispersant were mixed with 100 parts by weight of a mixed solution. Zirconia balls with a size of 0.1 to 2.0 mm were added to the mixed solution and ground and dispersed in a bead mill for 50 hours to obtain a blue organic pigment dispersion.

[0068] Subsequently, 3 parts by weight of the obtained blue organic pigment dispersion, 48.5 parts by weight of adhesive resin, and 48.5 parts by weight of dilution solution were mixed with 100 parts by weight of color dispersion, coated with wire bar no. 6, and then dried to produce a blue color film.

[0070] Comparative Example 2. TiO 2 Red color film that does not contain dispersion

[0071] A color film was prepared in the same manner as Comparative Example 1, except that a red organic pigment was used.

[0073] Comparative Example 3. TiO 2 Yellow color film that does not contain dispersion

[0074] A color film was prepared in the same manner as Comparative Example 1, except that a yellow inorganic pigment was used.

[0076] Experimental Example 1. Comparison of Color Difference and Transmittance of Blue Films

[0077] The color difference and total light transmittance of the color films prepared in Example 1 and Comparative Example 1 were determined, and the results are shown in FIGS. 1 and 2 and Table 1.

[0078] At this time, the above total light transmittance represents the transmittance obtained by combining the general transmitted light and the scattered transmitted light using an integrating sphere.

[0079]

[0080] As shown in Table 1 and Figures 1 and 2 above, in the case of Example 1 containing a TiO2 dispersion, the transmittance is reduced compared to Comparative Example 1 which does not contain a TiO2 dispersion, but the reduction is small, and it can be confirmed that the original color is expressed even on white and black back sheets.

[0082] Experimental Example 2. Comparison of Color Difference and Transmittance of Red Film and Yellow Film

[0083] The color difference and total light transmittance of the color films prepared in Examples 2 to 3 and Comparative Examples 2 to 3 were determined, and the results are shown in Figures 3 to 4 and Table 2.

[0084] At this time, the above total light transmittance represents the transmittance obtained by combining the general transmitted light and the scattered transmitted light using an integrating sphere.

[0085]

[0086] As shown in Table 2 and Figures 3 to 4, in the case of Example 2 and Example 3 containing TiO2 dispersion, the transmittance is reduced compared to Comparative Example 2 and Comparative Example 3 not containing TiO2 dispersion, but the reduction is small, and it can be confirmed that the original color is expressed even on white and black back sheets.

[0087] In addition, as shown in Fig. 3, in the case of Example 2 and Comparative Example 2 containing organic pigments, compared to Example 3 and Comparative Example 3 containing inorganic pigments, the transmittance is reduced, but it can be confirmed that the original color is clearly expressed with less influence from the back sheet.

[0088] Through the above results, it can be confirmed that the color film coated with a color dispersion mixed with an organic pigment dispersion and a TiO2 dispersion is suitable for use as a color film for solar modules, as it exhibits sufficient transmittance while expressing its original color without being affected by the back sheet.

Claims

Claim 1 A mixture comprising 2.6 to 4.6 parts by weight of an organic pigment dispersion, 0.2 to 0.6 parts by weight of a TiO2 dispersion, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluent, relative to 100 parts by weight of a color dispersion; wherein the organic pigment dispersion comprises 5 to 15 parts by weight of an organic pigment, 58 to 78 parts by weight of methyl isobutyl ketone, 4 to 8 parts by weight of 2-ethoxyethanol, and 15 to 25 parts by weight of a dispersant, relative to 100 parts by weight of the organic pigment dispersion; wherein the TiO2 dispersion comprises 10 to 30 parts by weight of TiO2, 60 to 80 parts by weight of methyl isobutyl ketone, and 5 to 15 parts by weight of a dispersant, relative to 100 parts by weight of the TiO2 dispersion; and wherein the size of particles contained in the organic pigment dispersion and the TiO2 dispersion is 30 to A color film for a solar module coated with a color dispersion having a thickness of 500 nm. Claim 2 delete Claim 3 (S1) a step of preparing an organic pigment dispersion; (S2) a step of preparing a TiO2 dispersion; (S3) a step of mixing 2.6 to 4.6 parts by weight of the organic pigment dispersion, 0.2 to 0.6 parts by weight of the TiO2 dispersion, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluent solvent, based on 100 parts by weight of the total mixture; and (S4) a step of coating and drying the mixture on a film; wherein the step of preparing the organic pigment dispersion (S1) comprises: (S1a) a step of mixing 5 to 15 parts by weight of organic pigment, 58 to 78 parts by weight of methyl isobutyl ketone, 4 to 8 parts by weight of 2-ethoxyethanol, and 15 to 25 parts by weight of dispersant relative to 100 parts by weight of the mixture solution; (S1b) a step of adding 0.1 to 2.0 mm zirconia balls to the mixed solution and grinding and dispersing in a bead mill for 50 to 200 hours; and the step of preparing the TiO2 dispersion (S2) comprises: (S2a) a step of mixing 10 to 30 parts by weight of TiO2, 60 to 80 parts by weight of methyl isobutyl ketone, and 5 to 15 parts by weight of dispersant relative to 100 parts by weight of the mixture solution; (S2b) adding 0.1 to the mixed solution A method for manufacturing a color film for a solar module, comprising the step of adding 2.0 mm zirconia balls and grinding and dispersing in a bead mill for 50 to 200 hours. Claim 4 delete Claim 5 delete

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