High-efficiency color film for photovoltaic module and method for manufacturing same

Abstract

The present invention relates to a high-efficiency color film for a photovoltaic module and a method for manufacturing same and, more specifically, to a high-efficiency color film for a photovoltaic module and a method for manufacturing same, wherein the color film is coated with a color dispersion in which an organic pigment dispersion and a TiO2 dispersion are mixed and has a total light transmittance of 50% or more, and the color difference (ΔE) with a black sheet and a white sheet is 10-20.

Description

Color film for high-efficiency solar modules and method for manufacturing the same

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

[0002]

[0003] To address global warming caused by greenhouse gases and conserve energy, countries around the world are working to reduce greenhouse gas emissions. Renewable energy sources like solar power are gaining attention as a solution.

[0004] In general, a solar power generation system is an assembly of solar cell modules formed in the shape of a panel on a support frame, which are connected in series or parallel. The solar cell module is composed of solar cell and front / rear films, and converts sunlight energy into electrical energy in the solar cell.

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

[0006] When solar power systems are installed on a building's windows, walls, and roofs to replace the building's exterior materials, they are called building-integrated photovoltaics (BIPV). Because BIPV is used as a building's exterior material, design elements that enhance the building's value are crucial.

[0007] However, the transparent colored coating film applied to the exterior of the BIPV as described above is affected by the color of the solar cell located on the back, and the color of the solar cell appears to be the color of the solar cell, or the color of the solar cell and the transparent coating film are mixed, causing a problem in which the original color cannot be recognized.

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

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

[0010] Due to the above problems, 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 the design elements are not degraded, and that allows the naked eye to see a different color from the solar cell module, while at the same time exhibiting high transmittance.

[0011]

[0012] The purpose of the present invention is to provide a high-efficiency color film for solar modules, which exhibits a high color difference when applied to a solar cell module so that design elements are not deteriorated, and a color different from that of the solar cell module can be confirmed with the naked eye, while at the same time exhibiting high transmittance, and a method for manufacturing the same, in order to solve the above problems.

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

[0014] The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the art from the description of the present invention.

[0015]

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

[0017] The present invention is a color film for a solar module coated with a color dispersion solution containing 2.6 to 4.6 parts by weight of an organic pigment dispersion solution, 0.2 to 0.6 parts by weight of a TiO2 dispersion solution, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a dilution solvent, relative to 100 parts by weight of a color dispersion solution.

[0018] In the present invention, the size of the particles contained 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 dilution solvent relative to 100 parts by weight of the total mixture; and (S4) coating and drying the mixture on a film.

[0020] In the present invention, the step of preparing the organic pigment dispersion (S1) is characterized by including the steps of (S1a) mixing 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 a mixed solution; and (S1b) adding 0.1 to 2.0 mm zirconia balls to the mixed solution and grinding and dispersing them in a bead mill for 50 to 200 hours.

[0021] In the present invention, the step of preparing the (S2) TiO2 dispersion is characterized by including the steps of (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 relative 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 the mixture in a bead mill for 50 to 200 hours.

[0022] Hereinafter, the present specification will be described in more detail.

[0023]

[0024] By means of solving the above problem, the present invention can provide a high-efficiency color film for solar modules and a method for manufacturing the same, which exhibits a high color difference when applied to a solar cell module without deteriorating design elements, so that a color different from that of the solar cell module can be confirmed with the naked eye, and at the same time exhibits high transmittance.

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

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

[0027]

[0028] Figure 1 is an image showing the results of a color difference experiment on a color film using a blue pigment according to an example and comparative example of the present invention.

[0029] FIG. 2 is a graph showing the total transmittance and direct transmittance of a color film to which a blue pigment is applied according to an example and a comparative example of the present invention.

[0030] Figure 3 is an image showing the results of a color difference experiment of a color film using red pigment and yellow pigment according to an example and comparative example of the present invention.

[0031] FIG. 4 is a graph showing the total transmittance and direct transmittance of a color film using red pigment and yellow pigment according to an example and comparative example of the present invention.

[0032]

[0033] The terms used in this specification have been selected from widely used, current terms, taking into account the functions of the present invention. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in certain cases, terms may be arbitrarily selected by the applicant, in which case their meanings will be described in detail in the relevant description of the invention. Therefore, the terms used in this invention should not be defined simply as names, but rather based on their inherent meanings and the overall content of the present invention.

[0034] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0035] Numerical ranges are inclusive of the values ​​defined in the ranges above. Any maximum numerical limitation given throughout this specification includes any lower numerical limitation, as if that lower numerical limitation were explicitly stated. Any minimum numerical limitation given throughout this specification includes any higher numerical limitation, as if that higher numerical limitation were explicitly stated. Any numerical limitation given throughout this specification will include any better numerical range within the broader numerical range, as if that narrower numerical limitation were explicitly stated.

[0036]

[0037] Color film for solar modules

[0038] The present invention relates to a color film for a solar module coated with a color dispersion solution containing 2.6 to 4.6 parts by weight of an organic pigment dispersion solution, 0.2 to 0.6 parts by weight of a TiO2 dispersion solution, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluting solvent, relative to 100 parts by weight of a color dispersion solution.

[0039] The above TiO2 dispersion may preferably be included in an amount of 0.4 parts by weight.

[0040] The above-mentioned color film for solar modules may have a total transmittance of 50% or more at 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 color film for solar modules may have a general transmittance of 80% or less compared to the total transmittance.

[0041] In the present invention, the size of the particles included in the pigment dispersion and the TiO2 dispersion may be 30 to 500 nm. When the size of the particles is 500 nm or more, light may not be transmitted, and when the size is 30 nm or less, light may not be scattered.

[0042]

[0043] Method for manufacturing color film for solar modules

[0044] The present invention relates to a color film for a solar module coated with a color dispersion solution containing 2.6 to 4.6 parts by weight of an organic pigment dispersion solution, 0.2 to 0.6 parts by weight of a TiO2 dispersion solution, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluting solvent, relative to 100 parts by weight of a color dispersion solution.

[0045] The above TiO2 dispersion may preferably be included in an amount of 0.4 parts by weight.

[0046] The above-mentioned color film for solar modules may have a total transmittance of 50% or more at 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 color film for solar modules may have a general transmittance of 80% or less compared to the total transmittance.

[0047] In the present invention, the size of the particles included in the pigment dispersion and the TiO2 dispersion may be 30 to 500 nm. When the size of the particles is 500 nm or more, light may not be transmitted, and when the size is 30 nm or less, light may not be scattered.

[0048] The present invention relates to a method for manufacturing a color film for a solar module, comprising 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 dilution solvent relative to 100 parts by weight of the total mixture; and (S4) coating and drying the mixture on a film.

[0049] 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 pigment dispersion is included in an amount less than 2.6, the desired color may not be displayed, and if the pigment dispersion is included in an amount greater than 4.6, the transmittance may be low, making it difficult to apply to solar modules.

[0050] The above TiO2 dispersion may be mixed with the above organic pigment dispersion, the adhesive resin, and the dilution solvent to have a total transmittance of 50% or more at 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 color film for solar modules may have a general transmittance of 80% or less compared to the total transmittance.

[0051] The color film for solar modules manufactured using the above manufacturing method may be suitable for use as a color layer on the front surface of a solar panel.

[0052] In the present invention, the step of preparing the organic pigment dispersion (S1) may include the step of (S1a) mixing 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 a mixed solution; and (S1b) 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 thus may not be used as a coating solution.

[0053] In the present invention, the step of preparing the (S2) TiO2 dispersion may include the steps of (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 relative 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 the solution 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 thus may not be used as a coating solution.

[0054]

[0055] Example

[0056] Hereinafter, examples of the present invention will be described in detail, but it is obvious that the present invention is not limited to the following examples.

[0057] The advantages and features of the present invention, and the methods for achieving them, will become clearer with reference to the embodiments described in detail below. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The embodiments are provided solely 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. The present invention is defined solely by the scope of the claims.

[0058]

[0059] Example 1. Blue color film

[0060] 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 having a size of 0.1 to 2.0 mm were added to the mixed solution, and the mixture was ground and dispersed in a bead mill for 50 hours to obtain a blue organic pigment dispersion.

[0061] Afterwards, 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 respect to 100 parts by weight of the mixed solution. Zirconia balls having a size of 0.1 to 2.0 mm were added to the mixed solution, and the mixture was ground and dispersed in a bead mill for 50 hours to obtain a TiO2 dispersion.

[0062] Afterwards, 2.8 parts by weight of the blue color organic pigment dispersion obtained above, 0.4 parts by weight of the TiO2 dispersion obtained above, 48.5 parts by weight of the adhesive resin, and 48.5 parts by weight of the diluted solution were mixed with 100 parts by weight of the color dispersion, coated with wire bar no. 6, and dried to produce a blue color film.

[0063]

[0064] Example 2. Red color film

[0065] A color film was manufactured in the same manner as in Example 1, except that a red colored organic pigment was used.

[0066]

[0067] Example 3. Yellow color film

[0068] A color film was manufactured in the same manner as in Example 1, except that a yellow colored inorganic pigment was used.

[0069]

[0070] Comparative Example 1. Blue color film without TiO2 dispersion

[0071] 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 having a size of 0.1 to 2.0 mm were added to the mixed solution, and the mixture was ground and dispersed in a bead mill for 50 hours to obtain a blue organic pigment dispersion.

[0072] Afterwards, 3 parts by weight of the blue color organic pigment dispersion obtained above, 48.5 parts by weight of the adhesive resin, and 48.5 parts by weight of the diluted solution were mixed with 100 parts by weight of the color dispersion, coated with wire bar no. 6, and dried to produce a blue color film.

[0073]

[0074] Comparative Example 2. Red color film without TiO2 dispersion

[0075] A color film was manufactured in the same manner as in Comparative Example 1, except that a red colored organic pigment was used.

[0076]

[0077] Comparative Example 3. Yellow color film not containing TiO2 dispersion

[0078] A color film was manufactured in the same manner as in Comparative Example 1, except that a yellow-colored inorganic pigment was used.

[0079]

[0080] Experimental Example 1. Comparison of color difference and transmittance of blue films

[0081] The color difference and total light transmittance of the color films manufactured in the above Example 1 and Comparative Example 1 were confirmed, and the results thereof are shown in Figures 1 and 2 and Table 1.

[0082] At this time, the total light transmittance is expressed as the transmittance combining the general transmitted light and the scattered transmitted light using an integrating sphere.

[0083]

[0084] As shown in Table 1 and FIGS. 1 and 2, in the case of Example 1 containing a TiO2 dispersion, the transmittance is reduced compared to Comparative Example 1 not containing 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.

[0085]

[0086] Experimental Example 2. Comparison of color difference and transmittance of red and yellow films.

[0087] The color difference and total light transmittance of the color films manufactured in the above Examples 2 to 3 and the above Comparative Examples 2 to 3 were confirmed, and the results thereof are shown in Figures 3 to 4 and Table 2.

[0088] At this time, the total light transmittance is expressed as the transmittance combining the general transmitted light and the scattered transmitted light using an integrating sphere.

[0089]

[0090] As shown in Table 2 and Figures 3 to 4, in the case of the above Examples 2 and 3 including the TiO2 dispersion, the transmittance is reduced compared to the above Comparative Examples 2 and 3 not including the 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.

[0091] In addition, as shown in Fig. 3, in the case of Example 2 and Comparative Example 2 containing organic pigments, the transmittance is reduced compared to Example 3 and Comparative Example 3 containing inorganic pigments, but it can be confirmed that the influence of the back sheet is less and the original color is clearly expressed.

[0092] Through the above results, it can be confirmed that a color film coated with a color dispersion solution containing a mixture of an organic pigment dispersion solution and a TiO2 dispersion solution exhibits sufficient transmittance while expressing the original color without being affected by the back sheet, and is therefore suitable for use as a color film for solar modules.

Claims

1. 2.6 to 4.6 parts by weight of organic pigment dispersion per 100 parts by weight of color dispersion, TiO 2 A color film for a solar module coated with a color dispersion containing 0.2 to 0.6 parts by weight of a dispersion, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a diluting solvent.

2. In paragraph 1, The above organic pigment dispersion and the above TiO 2 A color film for solar modules, characterized in that the size of particles contained in the dispersion is 30 to 500 nm.

3. (S1) Step of preparing an organic pigment dispersion; (S2) TiO 2 A step of preparing a dispersion; (S3) 2.6 to 4.6 parts by weight of the organic pigment dispersion relative to 100 parts by weight of the total mixture, the TiO 2 A step of mixing 0.2 to 0.6 parts by weight of a dispersion, 45 to 50 parts by weight of an adhesive resin, and 45 to 50 parts by weight of a dilution solvent; and (S4) A method for manufacturing a color film for a solar module, comprising the step of coating and drying the above mixture on a film.

4. In paragraph 3, The step of preparing the organic pigment dispersion (S1) above is (S1a) a step of mixing 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 a mixed solution; and (S1b) A method for manufacturing a color film for a solar module, characterized by comprising the step of adding 0.1 to 2.0 mm zirconia balls to the mixed solution and grinding and dispersing them in a bead mill for 50 to 200 hours.

5. In paragraph 3, Above (S2) TiO 2 The steps for preparing the dispersion are (S2a) TiO per 100 parts by weight of mixed solution 2 A step of mixing 10 to 30 parts by weight of a polymer, 60 to 80 parts by weight of methyl isobutyl ketone, and 5 to 15 parts by weight of a dispersant; and (S2b) A method for manufacturing a color film for a solar module, characterized by comprising the step of adding 0.1 to 2.0 mm zirconia balls to the mixed solution and grinding and dispersing the mixture in a bead mill for 50 to 200 hours.

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