KR102318697B1 - Solar power generating facility using thermally shielding member - Google Patents

Abstract

The present invention relates to a solar power generation facility, and more specifically, to a solar power generation facility which includes: a photovoltaic module which is installed by a support based on a floor surface and can realize double-sided power generation; and a light reflecting member which is provided in an upper part of the floor surface. As the light reflecting member reflects solar energy emitted from the sun and incident on the light reflecting member, additional power generation is realized by using the solar energy reflected from the light reflecting member, so that power generation efficiency is increased. Furthermore, since a rise in the temperature of the power generation facility is suppressed by the light reflecting member, the power generation efficiency can be further improved.

Description

Solar power generating facility using thermally shielding member with improved power generation efficiency by using a light reflective member

The present invention relates to a photovoltaic power generation facility, and more particularly, includes a photovoltaic module installed by a support based on a floor and capable of double-sided power generation, and a light reflecting member provided on the upper portion of the floor, the light reflecting member comprising: As the solar energy emitted from the sun and incident on the light reflecting member is reflected, the power generation efficiency is increased through additional power generation using the solar energy reflected from the light reflecting member, and further, the temperature rise of the power generation facility is increased by the light reflecting member It relates to a solar power generation facility that can be suppressed to further improve power generation efficiency.

In general, most photovoltaic modules are manufactured to use only a single section, and are installed so as to receive sunlight only on the upper part of the module. In order to produce a lot of electricity with such a single-sided photovoltaic module, it is necessary to install a wide photovoltaic module. Accordingly, a wide power plant member purchase cost and installation cost are required, and the environmental destruction problem is also emerging.

In order to solve this problem, countries around the world are investing a lot of time and money in research to improve the power generation efficiency by 1~2%, but there is a very difficult problem in developing a solar module that dramatically increases the power generation efficiency in the near future. .

Korean Patent Publication No. 1522372 (2015.05.15.)

The present invention has been devised to solve the above problems, and includes a photovoltaic module installed by a support based on the floor and capable of double-sided power generation, and a light reflecting member provided on the upper portion of the floor, and the light reflecting member is As the solar energy emitted from the sun and incident on the light reflecting member is reflected, the power generation efficiency is increased through additional power generation using the solar energy reflected from the light reflecting member, and further, the temperature of the power generation facility is increased by the light reflecting member It is an object of this suppression to provide a photovoltaic power generation facility in which power generation efficiency can be further improved.

Photovoltaic power generation facility according to an example of the present invention is installed by a support based on the floor, a photovoltaic module capable of double-sided power generation; and a light reflecting member provided on the bottom surface, wherein the light reflecting member may reflect solar energy emitted from the sun and incident on the light reflecting member.

The light reflective member may include silica particles having an average particle diameter of 0.5 to 0.8 μm, a specific surface area of 5 to 9 m^2/g, and a sphericity of 0.8 or more; rutile particles; and an emulsion resin.

The light reflecting member may be at least one of light reflecting paint or light reflecting sheet paper.

The light reflective paint and/or the light reflective sheet may be directly painted on the bottom surface or directly attached to the bottom surface.

The light reflection member may have a bright color.

The light reflective member may have a solar reflectance of 60% or more in a visible ray region and a near infrared region.

The light reflection member may have a dark color.

The light reflective member may have a solar reflectance of 40% or more in a visible ray region and a near infrared region.

It further includes; a plate member provided on the bottom surface, the light reflective paint and/or the light reflective sheet paper may be painted on the plate member or attached to the bottom plate.

The solar module may be an amorphous thin film type module.

The solar module may be a double-sided crystalline module in which a crystalline module is provided on an upper surface and a lower surface, respectively.

According to the present invention, as the light reflecting member is provided on the lower side of the photovoltaic module capable of double-sided power generation, sunlight irradiated directly from the sun can be directly absorbed and generated by the upper surface of the double-sided photovoltaic module, and can be generated around the photovoltaic module. The irradiated sunlight is reflected by the light reflective member and is incident on the lower surface of the double-sided solar module to generate additional power, thereby maximizing the solar power generation efficiency.

In addition, as the light reflection member is provided on the floor surface, the temperature rise of the power generation facility itself is suppressed, so that the solar power generation efficiency can be further increased. Furthermore, when a photovoltaic power generation facility is installed on the roof of a building, there is an additional effect of suppressing an increase in the internal temperature of the building.

1 shows a solar power generation facility according to an example of the present invention.
Figure 2 shows the relationship between the solar reflectance of the light reflecting member according to the present invention and the amount of additional power generation of the power generation facility.
3 shows a solar power generation facility according to another example of the present invention.
4 shows a side view of an amorphous thin film-type module according to an example of the present invention.
5 is a graph showing the reflectance in the wavelength band of the light reflective coating film of the light reflective paint according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 shows a photovoltaic power generation facility according to an example of the present invention, the photovoltaic power generation facility 10 according to the present invention as shown includes a photovoltaic module 200 and a light reflecting member 300, , it may further include a floor surface 100 on which the solar power generation facility 10 is installed.

The floor surface 100 is a basic floor surface on which the solar module 200 is installed and the light reflection member 300 is provided, and may correspond to a floor surface such as a forest field, a field or a roof of a building.

The solar module 200 is installed by the support 250, and is installed on the floor 100 through the support 250 and spaced apart from the floor 100 by a predetermined distance, so that electricity can be produced using sunlight. A plurality of photovoltaic cells may be provided. Since the photovoltaic cell power generation method is a commercialized known technology, a detailed description thereof will be omitted.

The photovoltaic module 200 is capable of double-sided power generation, and double-sided power generation means that both sides are available for photovoltaic power generation, as opposed to a photovoltaic module using only a single side as described above in the background art. To this end, the photovoltaic module 200 of the present invention may be provided with photovoltaic cells on the upper and lower surfaces, respectively. Alternatively, as will be described later, it may be an amorphous thin-film module through which sunlight can pass, and in this case, the thin-film module itself may be capable of double-sided power generation.

The light reflecting member 300 is provided on the bottom surface 100 , and the light reflecting member 300 reflects solar energy emitted from the sun and incident on the light reflecting member.

Solar energy means radiant energy from the sun, and the light reflective member 300 of the present invention reflects the sun's radiant energy itself to block solar energy from being absorbed by the light reflective member 300, and specifically It reflects sunlight in the ray region (about 300 nm to 780 mn) and at the same time reflects sunlight in the near infrared region (about 700 nm to 2500 nm).

About half of the sunlight that reaches the earth's surface is visible light, and most of the rest is infrared. More specifically, out of 1,004W/m^2 of solar energy reaching the earth's surface, visible light is 445W/m^2, infrared light is 527W/m^2, and ultraviolet light is about 32W/m^2, and furthermore, sunlight Most of the infrared rays correspond to near-infrared rays. The light reflecting member 300 of the present invention may reflect visible light and near infrared rays, which occupy most of such sunlight.

According to the present invention, as the light reflecting member is provided on the lower side of the photovoltaic module capable of double-sided power generation, sunlight irradiated directly from the sun can be directly absorbed into the upper surface of the photovoltaic module and generated, and irradiated to the periphery of the photovoltaic module As the sunlight incident on the bottom surface is reflected by the light reflection member and is incident on the lower surface of the solar module, additional power generation can be made. Accordingly, the power generation efficiency of the solar power generation facility can be maximized.

Figure 2 shows the relationship between the solar reflectance of the light reflective member according to the present invention and the amount of additional power generation of the power generation facility. If it is 40% or more, it can be seen that the additional power generation amount is 15% or more, which significantly increases the power generation efficiency compared to the area. As such, the solar reflectance of the light reflecting member of the present invention is preferably 40% or more, more preferably 60% or more, and still more preferably 80% or more. In this case, as will be described later, when the solar reflectance is 40% or more, it may correspond to a case in which the light reflection member has a dark color, and when it is 60% or more, it may correspond to a case in which the light reflection member has a bright color.

Furthermore, according to the present invention, as the light reflection member is provided on the floor surface, it is possible to suppress the temperature rise of the power generation facility itself. That is, since the light reflecting member blocks solar energy itself to significantly lower the absorption and emission of heat, the temperature change of the floor surface provided with the light reflecting member is not large, so the temperature of the solar power generation facility, that is, the solar module even during a hot day can be prevented from rising excessively. When the temperature of the photovoltaic module rises, the power generation efficiency is lowered. According to the present invention, since the temperature rise of the photovoltaic module is suppressed by the light reflecting member as described above, the power generation efficiency of the power generation facility can be further increased. have. In addition, when a power generation facility is installed on the roof of a building, the temperature rise of the roof irradiated with direct sunlight from the sun is suppressed as a light reflective member is provided on the floor surface of the building roof, thereby preventing the increase in the internal temperature of the building. There is an effect.

Hereinafter, specific embodiments of the present invention will be described.

The light reflective member of the present invention may be light reflective paint or light reflective sheet paper, and the light reflective sheet may be in the form of a film or in the form of directly pasting an adhesive to a mat or mastic-type product with a waterproof function, or a material having adhesive performance. It can be painted and attached. In the case of light reflective paint, the light reflective member may be directly painted on the floor surface, that is, on the floor surface, and in the case of light reflective sheet paper, it may be directly attached to the floor surface. The paint may be painted and a light reflective sheet may be attached to other areas. However, the light reflective paint and the light reflective sheet are for describing one form of the light reflective member, and the present invention is not limited thereto, and various methods for providing the light reflective member on the floor surface are applicable. In addition, the range in which the light reflective member is provided is not limited to a certain area, but it is preferable that the photovoltaic module is provided larger than the area in which the photovoltaic module is installed to include all of the area in which the photovoltaic module is installed.

Here, the light reflective paint may be a bright color paint, and the light reflective sheet may be a bright color sheet. A bright color means a color with high brightness or saturation, and may be representative of white, light gray, or the like. In particular, white has a very high reflectance in the visible ray region of sunlight. Thus, when white light reflective paint or light reflective sheet paper is provided on the floor as a light reflective member, it is reflected by the light reflective member on the floor. The amount of sunlight incident on the lower surface of the photovoltaic module, particularly in the visible ray region, increases, so that the power generation efficiency of the power generation facility can be increased.

However, the present invention is not limited thereto, and light reflective paint or light reflective sheet paper may have a dark color. A dark color is a color contrasting with a light color, and is a color with low brightness or saturation, and may typically correspond to black or dark gray.

When the light reflective member, that is, light reflective paint or light reflective sheet paper has a dark color, the solar reflectance may be 40% or more, and if it has a bright color, the solar reflectance may be 60% or more. Dark colors have a smaller albedo than bright colors, and in particular, since the reflectance of visible light is small, solar reflectance may be lower than that of bright colors. However, there is an advantage in that light reflection members of various colors can be applied in consideration of the appearance of the photovoltaic power generation facility itself or the surroundings of the facility.

However, even when the light reflecting member has a dark color and the reflectance of visible light is somewhat low, as described above, the light reflecting member of the present invention has a high reflectance in the infrared region corresponding to more than half of the total energy of sunlight. and, accordingly, the function of suppressing the temperature increase of the solar power generation facility can be maintained as it is. As a result, the effect of preventing a decrease in power generation efficiency due to an increase in the temperature of the photovoltaic power generation facility may be maintained. In addition, as will be described later, when the solar module is an amorphous thin film module, it is possible to secure additional power generation by a certain amount or more even with a high infrared reflectance.

3 is a view showing a photovoltaic power generation facility according to another example of the present invention, according to another example of the present invention as shown, it may further include a plate member 400 provided on the floor surface 100 upper. In addition, when the light reflective member 300 is a light reflective paint, it may be painted on the plate member 400 , and in the case of a light reflective sheet paper, it may be attached on the plate member 400 . Such a plate member 400 may be additionally provided when it is difficult to paint directly on the floor or attach sheet paper (eg, when the floor surface is made of soil, such as in a forest or field).

Although not shown, the plate member 400 may be directly fixed on the floor surface through a separate fixing member for fixing the plate member 400, or may be fixed using the support 250 of the solar module, or It may be fixed through a separate plate member support. In this way, the plate member 400 may be disposed to be in close contact with the bottom surface, or may be disposed to be spaced apart from the bottom surface by a predetermined distance.

Here, the plate member 400 may be a reflective light plate of a bright color, and in this case, the light reflective paint painted on the plate member may be a transparent color paint, or the light reflective sheet attached to the plate member may be a transparent color sheet paper. As described above, as the light reflective paint or light reflective sheet paper of a transparent color is provided on the reflective plate of the bright color, both the solar reflectance in the visible region and the solar reflectance in the infrared region are increased, as described above, along with the increase in power generation efficiency. Temperature suppression of the power plant can be simultaneously enabled.

On the other hand, when the light reflective member 300 has a transparent color, the plate member 400 is not necessarily required. When available, only transparent colored reflective paint or reflective sheets may be painted or adhered to the paint.

On the other hand, in the present invention, the photovoltaic module capable of double-sided power generation as described above may be an amorphous thin-film module capable of absorbing sunlight in all areas and transmitting light at the same time. The amorphous thin film module includes, for example, a silicon thin film solar cell, and may be manufactured by using a glass, plastic, or metal plate as a wafer instead of a silicon wafer and coating a light absorption layer material very thinly on both surfaces. The amorphous thin film module is economically advantageous because of its low price, and since it is possible to transmit light by itself and the light absorption layer material is applied on both sides, the crystalline solar module to be described later is a photovoltaic cell on both the upper and lower surfaces. Unlike this to be provided, even if a photovoltaic cell is provided on only one side, double-sided power generation is possible, thereby reducing the overall volume of the power generation facility.

4 is a side view of the amorphous thin-film module, and shows the principle of increasing the amount of power generation when the solar module is a thin-film module. In the case of a thin-film module, in addition to sunlight (①) that is directly irradiated to the upper part of the module, and sunlight that is incident around the module and is reflected by the light reflecting member and is incident to the lower part of the module (②), it is directly directed to the upper part of the module. Among the irradiated sunlight (③-1), the sunlight transmitted without being absorbed by the module is reflected by the light reflection member, and the sunlight (③-2) is incident again to the lower part of the module and can be converted into power generation, The power generation efficiency can be further increased. Here, among the sunlight directly irradiated to the upper part of the module, the sunlight passing through the module has a higher proportion of infrared rays having a longer wavelength than visible rays, and the reflective member of the present invention has a high infrared solar reflectance, so it is possible to secure a stable amount of additional power generation do. As such, in the case of an amorphous thin-film module, it is possible to generate electricity by absorbing sunlight in the infrared region. have.

Another solar module capable of double-sided power generation may be a crystalline-based module provided on the upper surface and the lower surface, respectively. The crystalline module may be manufactured as a solar module of a desired voltage and current by making a solar cell with silicon and connecting them in series and parallel. Although the crystalline module has a disadvantage that it is expensive, it may be most preferable in terms of power generation efficiency because it has excellent conversion efficiency.

As described above, the present invention uses solar energy wasted on the floor surface by providing a light reflection member on the floor surface. can be maximized, and through this, the power generation capacity compared to the installation area of the power generation facility can be greatly increased.

Hereinafter, the light reflection member will be described in detail.

The light reflective paint includes silica particles having an average particle diameter of 0.5 to 0.8 μm, a specific surface area of 5 to 9 m 2 /g, and a sphericity of 0.8 or more; rutile titanium dioxide; and an emulsion resin.

The light reflective paint according to the present invention contains silica particles, rutile titanium dioxide, and emulsion resin that satisfy the above-mentioned conditions, and has the advantage of having excellent light reflection performance and water repellency properties. Furthermore, the coating film produced by this water-repellent property is strong against contamination and has the advantage of exhibiting high durability due to absorption prevention. In this case, the sphericity means the ratio of the projected area of a particle measured with a scanning electron microscope to the area of a true sphere calculated by the peripheral length.

More specifically, the light reflective paint according to the present invention includes silica particles having an average particle diameter of 0.55 to 0.75 μm, a specific surface area of 5.2 to 8 m 2 /g, and a sphericity of 0.9 or more; rutile titanium dioxide; and emulsion resins. When the silica particles according to an embodiment of the present invention satisfy the above-described physical properties, the viscosity of the light reflective paint produced by the particle size, sphericity, and specific surface area of the silica particles can be lowered, It has the advantage of improving constructability.

Furthermore, the silica particles according to an embodiment of the present invention may have an internal void content of 0.1% by volume or less. That is, the light reflective paint according to the present invention contains silica particles and rutile titanium dioxide in the above-mentioned particle range, unlike the conventional light reflective paint in which hollow particles store heat to achieve light reflection or heat insulation. While exhibiting excellent light reflection performance by reflecting light, it is possible to prevent internal damage due to heat storage, which is a problem of conventional hollow particles, and has the advantage of forming a light reflective coating film with excellent durability by preventing such internal damage.

Specifically, in the case of conventional light-reflective or heat-insulating paints containing hollow particles, the light-reflecting or heat-insulating effect was achieved by forming an air layer in the coating film using large particles of 2 μm or more to prevent heat transfer. However, in the case of using such hollow particles, a desired thermal insulation effect may be exhibited only when pores of a certain size or more are secured, and due to the nature of the particle size, there may be a problem that the thickness of the coating film must be applied to a thickness of 1 mm or more. However, when the paint containing the hollow particles is thickly applied to a thickness of 1 mm or more, there is a problem in that water repellency is significantly lowered due to high hygroscopicity by the hollow particles. There is a problem in the process, such as applying a waterproof treatment on the coating film of the coating layer, or mixing hollow particles as a component of a thickly applied waterproof coat.

However, in the case of the present invention, the light reflection effect can be achieved in a way that the heat energy contained in the light energy is not absorbed by reflecting light, rather than a thermal insulation preventing the movement of heat. Silica particles having an average particle diameter of 0.5 to 0.8 μm, a specific surface area of 5 to 9 m 2 /g, and a sphericity of 0.8 or more to achieve this effect; rutile titanium dioxide; And emulsion resin; including; overcomes the problems of the paint containing the hollow particles as described above. Furthermore, due to the influence of these fine particles, the filling (packing) of the particles included in the coating film is high, and thus water repellency is excellent, and hygroscopicity does not appear because it does not contain hollow particles. Due to these advantages, the waterproof coating film as described above is not additionally required, and there is an advantage in that the light reflection coating film can be formed with a relatively thin thickness of several tens to several hundreds of μm.

In addition, in the case of the conventionally used hollow particles of 2 μm or more, there is a problem in that the surface of the coating film has high hygroscopicity and high surface energy even when an emulsion resin is used. When the coating film has a high surface energy, hydrophobic materials can be easily adsorbed to reduce the surface energy, and as a result, the coating film is contaminated and the reflectance of light is rapidly reduced. Accordingly, there is a problem in that the light reflection effect due to the reflection of light is also proportionally lowered. However, in the case of the present invention, even if the emulsion resin is used, the surface energy of the coating film is very low, so that the adsorption of the hydrophobic material does not occur, and the light reflectance is maintained for a long time, so that the light reflection performance can be maintained for a long time. In addition, due to the absorptivity of the aforementioned hollow particles, there may be a problem that the hollow structure is destroyed as the volume expands due to solidification while the hollow particles hold moisture, especially in winter.

In addition, it is advantageous to obtain a smooth surface from a constructional point of view, but in the case of including particles having a relatively large size such as conventional hollow particles, the viscosity is very high (10000 cP or more), so workability is deteriorated, and the surface is very rough after application of the paint Since this is obtained, there is a problem in that additional work such as grinding is required to obtain a smooth surface. However, although the light reflective paint according to the present invention is a paint composition with a similar solid content, the viscosity is 300 to 1500 cP, which is not significantly different from that of the conventional water-based paint, low viscosity, easy workability, and application without separate grinding It has the advantage of being able to obtain a smooth drawing comparable to that of solvent-based paints.

In addition, in the case of conventional hollow particles, heat is implied in the hollow structure, and when the ambient temperature is suddenly lowered due to rain, etc., stress is generated due to a high temperature gradient, and thus cracks are generated or destroyed in the hollow particles. Problems may arise. The destruction of such a hollow structure has a problem that not only significantly lowers the thermal insulation performance, but also affects the durability of the coating film itself. However, in the case of the present invention, since the specific heat is relatively low and does not contain a hollow structure, heat is not implied. Accordingly, in the case of the coating film formed of the light reflective paint according to the present invention, there is an advantage in that light reflection performance and durability can be maintained for a long period of time.

In addition, when using the conventional hollow particles, there is a problem that the coating film needs to be thickened for light reflection. When additives are added, there is a problem in that compounds harmful to the human body, such as volatile organic compounds, are released from the coating film. However, the light reflective paint according to the present invention has an average particle diameter of 0.5 to 0.8 μm, a specific surface area of 5 to 9 m 2 /g, and a sphericity of 0.8 or more. It can exhibit high light reflection performance even when applied, and furthermore, since it can be applied in a thin thickness, additives for shortening the drying time may not be included. There is an advantage in preventing the problem of environmental pollution or substances for the human body being released from the coating film by the absence of such additives.

In addition, the silica particles according to an embodiment of the present invention may contain 0.7 to 2 μm of silica particles in an amount of 10 wt% or more. When the silica particles according to an embodiment of the present invention satisfy an average particle diameter of 0.5 to 0.8 μm, and contain 10 wt% or more of silica particles having a particle diameter of 0.7 to 2 μm, a wide range of infrared rays is reflected and scattered through reflection and scattering. By blocking it, the light reflection performance can be significantly improved. Specifically, the silica particles according to an embodiment of the present invention may include 10 to 30% by weight of silica particles having a particle diameter of 0.7 to 2 μm. In the above range, there is an advantage in that the wavelength of the infrared range applied to the coating film by sunlight can be effectively blocked. More specifically, when the particle diameter range of the silica particles in the light reflective paint according to an embodiment of the present invention satisfies the above range, the reflectance in the infrared range of 780 to 2500 nm wavelength is 65% or more, specifically 75 % or more, more specifically 80% or more. That is, the light reflective paint according to an embodiment of the present invention has the advantage of exhibiting high blocking efficiency by blocking not only the visible light range but also the infrared range, which has a great influence on the heating of the construction surface, by 65% or more.

In addition, the silica particles according to an embodiment of the present invention may include 10 wt% or more of silica particles having a particle diameter of 0.3 μm or less. More specifically, the silica particles according to an embodiment of the present invention may include 10 to 30% by weight of silica particles having a particle diameter of 0.05 to 0.3 μm. There is an advantage in that the light reflection performance can be partially improved by blocking visible light through reflection and scattering in the above-described range.

On the other hand, the silica particles according to an embodiment of the present invention may have a fluorinated surface. As the surface of the silica particles is fluorinated, the surface energy of the silica particles is lowered, effectively blocking the adsorption of various pollutants. can be effectively refined. A fluoroalkyl silane-based coupling agent or a perfluoroalkyl silane-based coupling agent may be used to fluorinate the surface of the silica particles, wherein the fluoroalkyl or perfluoroalkyl may preferably have C3-C12 carbon atoms. have.

In the light reflective paint according to an embodiment of the present invention, the rutile titanium dioxide may have a particle diameter of 0.2 to 0.55 μm. When silica particles having an average particle diameter of 0.5 to 0.8 μm, a specific surface area of 5 to 9 m 2 /g, and a sphericity of 0.8 or more and rutile titanium dioxide having the above-mentioned average particle diameter are mixed, particles in the coating film to be formed later There is an advantage that can improve the adhesion between the liver. It is possible to prevent problems such as cracking, cracking, or peeling due to the use of the coating film formed by these advantages.

Furthermore, the light reflective paint according to an embodiment of the present invention may include silica particles: rutile titanium dioxide in a weight ratio of 1:2 to 5. When the light reflective paint according to an embodiment of the present invention contains silica particles and rutile titanium dioxide in the above-mentioned ranges, it is excellent in preventing moisture absorption while preventing a decrease in light reflection performance due to the excessive amount of silica particles included. Accordingly, there is an advantage in that it is possible to manufacture a light reflective paint having excellent durability against moisture.

In addition, the light reflective paint according to an embodiment of the present invention may contain 20 to 45 wt% of a mixture of silica particles and rutile titanium dioxide. When the light reflective paint according to an embodiment of the present invention contains a mixture of silica particles and rutile titanium dioxide in the above range, a coating film having excellent adhesion to the substrate can be prepared, and further, the light reflective paint can be easily applied And it has the advantage of being able to form a coating film of uniform thickness.

Silica particles and rutile titanium dioxide according to an embodiment of the present invention may satisfy Relational Equation 1 below.

[Relational Expression 1]

는 루타일 이산화티탄의 평균입경이며,

는 실리카 입자의 평균입경이다. 나아가, 본 발명의 일 실시예에 의한 광반사 페인트에서

는 0.5 내지 1.1, 더욱 구체적으로는 0.6 내지 1.05일 수 있다. 본 발명의 일 실시예에 의한 광반사 페인트가 상술한 입경 비율을 만족하는 루타일 이산화티탄 및 실리카 입자를 포함하는 경우, 높은 광반사성능을 확보하고, 루타일 이산화티탄에 의하여 적외선 차단 성능이 더욱 향상될 뿐만 아니라 도막에서 실리카 입자 및 루타일 이산화티탄 입자의 결착이 용이하여 더욱 견고한 도막을 형성할 수 있는 장점이 있다. In the above relation 1,

is the average particle diameter of rutile titanium dioxide,

is the average particle diameter of silica particles. Furthermore, in the light reflective paint according to an embodiment of the present invention

may be 0.5 to 1.1, more specifically 0.6 to 1.05. When the light reflective paint according to an embodiment of the present invention contains rutile titanium dioxide and silica particles satisfying the above-mentioned particle size ratio, high light reflection performance is secured, and infrared blocking performance is further improved by the rutile titanium dioxide In addition to the improvement, there is an advantage in that a more robust coating film can be formed because silica particles and rutile titanium dioxide particles are easily bound in the coating film.

The light reflective paint according to the present invention includes an emulsion resin together with silica particles having an average particle diameter of 0.5 to 0.8 μm, a specific surface area of 5 to 9 m 2 /g, and a sphericity of 0.8 or more, and rutile titanium dioxide. At this time, the emulsion resin is not limited if it is an emulsion resin usually included in paints or paints, but specifically, it is selected from acrylic emulsion, acrylic silicone emulsion, urethane emulsion, fluorine emulsion, silicone inorganic resin, silica sol resin and organic inorganic hybrid resin. It may include one or more than one.

As a specific and non-limiting example, the emulsion resin according to an embodiment of the present invention may be an acrylic emulsion, wherein the acrylic emulsion is specifically methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) Acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl acrylate, t-butyl methacrylate, pentyl methacrylate, hexyl methacrylate, heptyl acrylate, isooctyl acrylate, octyl Methacrylate, 2-ethylhexyl (meth) acrylate, isodecyl acrylate, decyl methacrylate, dodecyl methacrylate, isobornyl methacrylate, steryl (meth) acrylate and lauryl (meth) acrylic one or two or more acrylic acid ester monomers selected from the group consisting of: one or more ester or unsaturated compound monomers selected from vinyl acetate, vinyl butanoate, vinyl propionate, vinyl laurate, vinyl pyrrolidone, styrene, acrylonitrile and methacrylonitrile; and acrylic acid, itaconic acid, maleic anhydride, fumaric acid, methacrylic acid crotonic acid, ethyl methacrylic acid, hydroxymethyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, hydroxy One selected from hydroxybutyl (meth) acrylate, hydroxyhexyl (meth) acrylate, hydroxyoctyl (meth) acrylate, hydroxy lauryl (meth) acrylate and hydroxypropylene glycol (meth) acrylate; It may be polymerized by mixing two or more unsaturated carbonic acids or hydroxyl group-containing unsaturated monomers.

Furthermore, the light reflective paint according to an embodiment of the present invention may contain 30 to 60% by weight of the emulsion resin, specifically, 35 to 55% by weight. In this case, the emulsion resin may have a solid content of 30 to 50% by weight, but the present invention is not limited thereto. In the above range, it is possible to prepare a light reflective coating film having a thickness greater than or equal to the thickness capable of reflecting light by using the emulsion resin while preventing problems such as deterioration in the spreadability of the light reflective paint.

The light reflective paint according to an embodiment of the present invention may further include an inorganic filler. In this case, the inorganic filler is not limited in the case of an inorganic filler included in a conventional paint, more specifically, a water-based paint. As a specific and non-limiting example, the inorganic filler is one selected from calcium carbonate, aluminum hydroxide, alumina, magnesium hydroxide, magnesium oxide, dialuminum trioxide, aluminum nitride, silicon carbide, silicon nitride, zinc oxide, zirconium oxide, mica, talc and kaolin. Or it may include two or more, preferably, the inorganic filler according to an embodiment of the present invention may be calcium carbonate, but the present invention is not limited thereto.

Furthermore, the light reflective paint according to an embodiment of the present invention may contain 3 to 35 wt% of an inorganic filler. When the light reflective paint according to an embodiment of the present invention includes the inorganic filler in the above-described range, it is possible to hide the surface to be coated as an extender pigment and improve the aesthetics with a vivid color when the pigment is mixed.

The light reflective paint according to an embodiment of the present invention may contain a polyhydric alcohol. The light reflective paint according to an embodiment of the present invention has the advantage of preventing freezing by including a polyhydric alcohol, and furthermore, it is possible to prevent problems such as internal cracking of the coating film due to rapid moisture evaporation during drying of the light reflective paint. . In this case, the polyhydric alcohol may be one or two or more selected from the group consisting of an aliphatic dihydric alcohol, an aliphatic trihydric alcohol, an alicyclic dihydric alcohol, and an aromatic dihydric alcohol. Specifically, the aliphatic dihydric alcohol is ethylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octane straight-chain alcohols such as diol, 1,9-nonanediol, 1,10-dodecanediol, diethylene glycol, triethylene glycol and tetraethylene glycol; 1,2-, 1,3- or 2,3-butanediol, 2-methyl-1,4-butanediol, dipropylene glycol, diethylene glycol, neopentyl glycol, 2,2-diethyl-1,3-propane Diol, 2-methyl-1,5-pentanediol, 3-methyl-1,5-pentanediol, 2-methyl-1,6-hexanediol, 3-methyl-1,6-hexanediol, 2-methyl- 1,7-heptanediol, 3-methyl-1,7-heptanediol, 4-methyl-1,7-heptanediol, 2-methyl-1,8-octanediol, 3-methyl-1,8-octanediol and 4-methyloctanediol, etc., the aliphatic trihydric alcohol may be at least one selected from glycerin and trimethylolpropane, and the alicyclic dihydric alcohol is [1,4-cyclohexanediol, 1 ,3-cyclohexanedimethanol, 1,4-cyclohexanediol, 1,3-cyclopentanediol, 1,4-cycloheptanediol, 2,5-bis(hydroxymethyl)-1,4-dioxane; 2,7-Nobonanediol, tetrahydrofurandimethanol, 1,4-bis(hydroxyethoxy)cyclohexane, 1,4-bis(hydroxymethyl)cyclohexane and 2,2-bis(4-hydro It may be one or two or more selected from oxycyclohexyl) propane, and the aromatic dihydric alcohol is one selected from m- or p-xylylene glycol, bis (hydroxyethyl) benzene, and bis (hydroxyethoxy) benzene. Or it may be two or more, but the present invention is not limited thereto.

Preferably, the polyhydric alcohol may be an aliphatic polyhydric alcohol from the viewpoint of preventing the emission of environmental pollutants. In a specific and non-limiting example, the polyhydric alcohol is ethylene glycol, 1,3-propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1 straight-chain alcohols such as ,8-octanediol, 1,9-nonanediol, 1,10-dodecanediol, diethylene glycol, triethylene glycol, and tetraethylene glycol; 1,2-, 1,3- or 2,3-butanediol, 2-methyl-1,4-butanediol, dipropylene glycol, diethylene glycol, neopentyl glycol, 2,2-diethyl-1,3-propane Diol, 2-methyl-1,5-pentanediol, 3-methyl-1,5-pentanediol, 2-methyl-1,6-hexanediol, 3-methyl-1,6-hexanediol, 2-methyl- 1,7-heptanediol, 3-methyl-1,7-heptanediol, 4-methyl-1,7-heptanediol, 2-methyl-1,8-octanediol, 3-methyl-1,8-octanediol And it may be one or two or more selected from 4-methyloctanediol.

Furthermore, the light reflective paint according to an embodiment of the present invention may contain 1 to 5% by weight of a polyhydric alcohol. When the light reflective paint according to an embodiment of the present invention contains the polyhydric alcohol in the above-described range, it is possible to prevent the freezing prevention effect and at the same time prevent deterioration of physical properties such as lowering of adhesion due to too much polyhydric alcohol.

The light reflective paint according to an embodiment of the present invention may further include an additive. At this time, the additive may be one or two or more selected from a dispersing agent, an antifoaming agent, a preservative and a thickener, and further, each additive may be mixed according to the purpose and content normally included. As a specific and non-limiting example, the light reflective paint according to an embodiment of the present invention may contain 0.5 to 5% by weight of an additive, but the present invention is not limited thereto.

In addition, the solvent of the light reflective paint according to an embodiment of the present invention is not limited if it is a conventional solvent capable of uniformly dispersing the above-mentioned silica particles, rutile titanium dioxide and emulsion resin, but preferably one of the present invention The light reflective paint according to the embodiment may be a water-based paint including water as a solvent.

The present invention also provides a method for applying a light reflective coating film. The method for constructing a light reflective paint according to the present invention comprises: a coating film forming step of forming a coating film by applying the light reflective paint according to an embodiment of the present invention on a substrate; and a pattern forming step of forming a pattern on the surface of the coating film by pressing the pattern plate before drying the coating film.

The light reflective coating film formed by the method of constructing the light reflective coating film according to an embodiment of the present invention has advantages of excellent light reflection performance and durability.

Specifically, the method for constructing a light reflective coating film according to an embodiment of the present invention includes silica particles having an average particle diameter of 0.5 to 0.8 μm, a specific surface area of 5 to 9 m 2 /g, and a sphericity of 0.8 or more; rutile titanium dioxide; And by applying a light reflective paint containing; and forming a pattern on the coating film formed by the application of the light reflective paint, infrared rays incident from the sun (especially sunlight in the 780 nm ~ 2500 nm region corresponding to near infrared rays) are reflected And it has the advantage of maximizing the light reflection effect by the light reflection paint according to an embodiment of the present invention that blocks. That is, even if the pattern forming step is performed as in the present invention by applying light reflecting or insulating paint using conventional hollow particles, it is difficult to significantly improve the light reflection effect unless a configuration that reflects infrared rays is included as in the present invention. can see.

Specifically, the height of the pattern formed in the pattern forming step may be 0.005 to 0.1 mm, preferably 0.01 to 0.08 mm. Within the above-described range, it is possible to improve the light reflection performance due to a large surface area, and at the same time, it is possible to prevent a decrease in bonding strength with the substrate due to an excessively large difference in the thickness of the coating film.

In this case, before drying in the pattern forming step, it means that the coating film contains 3 to 40 wt %, preferably 10 to 30 % of the remaining solvent. In this case, the solvent may be water when the light reflective paint according to an embodiment of the present invention is water-based. That is, the method for constructing a light reflective coating film according to an embodiment of the present invention is formed without requiring great energy by pressing the pattern plate on the coating film containing the residual solvent in the above-described range before complete drying of the coating film. A pattern can be formed on the coating film.

In the method for constructing a light reflective coating film according to an embodiment of the present invention, the coating film forming step may be a step of forming a light reflective paint film according to an embodiment of the present invention to a thickness of 1 to 50 μm on a substrate.

Furthermore, in the light reflective paint construction method according to an embodiment of the present invention, the coating film forming step may be repeated two or more times, up to a maximum of 10 times, to form a multilayer coating film. In this case, the thickness of the formed multilayer coating film may be 30 to 350 μm, preferably 50 to 150 μm. While maximizing the light reflection effect in the above range, it is possible to prevent problems such as delay in drying due to an excessively thick layer.

The present invention also provides a light reflective coating film. The light reflective coating film according to the present invention may be formed of the light reflective paint according to an embodiment of the present invention. The light reflective coating film according to the present invention has excellent light reflection performance and has excellent durability due to water repellency.

Specifically, the light reflective coating film according to an embodiment of the present invention includes silica particles having an average particle diameter of 0.5 to 0.8 μm, a specific surface area of 5 to 9 m 2 /g, and a sphericity of 0.8 or more; rutile titanium dioxide; And emulsion resin; by blocking infrared rays, including light reflective paint containing;

Furthermore, the light reflective coating film according to an embodiment of the present invention includes patterned unevenness, and the surface area of the coating film is increased by the unevenness, thereby remarkably improving the light reflection performance. Furthermore, the height of the unevenness may be 0.005 to 0.1 mm, preferably 0.01 to 0.08 mm, and it prevents problems such as a decrease in adhesion to the substrate due to excessively high unevenness in the above range, and does not significantly affect the appearance There is an advantage in that the light reflection performance can be significantly improved.

Furthermore, the patterned unevenness according to an embodiment of the present invention may have a cross-sectional shape of a triangular shape having an inclination angle of 20 to 45°, and more preferably a right-angled triangular shape having an inclination angle of 20 to 45°. When the cross-section of the patterned unevenness according to an embodiment of the present invention is a right-angled triangle having an inclination angle of 20 to 45°, the light reflection performance is improved by reflecting the incident sunlight while exhibiting high light reflection performance with a large surface area. There are advantages to further improvement.

Hereinafter, the present invention will be described in detail by way of Examples. The examples described below are only for helping the understanding of the present invention, and the present invention is not limited thereto. At this time, the silica particles to be described later were measured for physical properties using the following method.

Measuring method of average particle size

Using a laser diffraction particle size analyzer (Bluewave, Microtrac), the particle size was measured using the scattering angle according to the particle size, and the average particle size was derived.

specific surface area

The specific surface area was measured using the BET1 point method.

sphericity

Measure the projected area (A) and peripheral length (PM) of the particle using a scanning electron microscope. The area of the true sphere corresponding to the peripheral length PM was designated as B. Thereafter, the sphericity of each particle was calculated as A/B=A*4ð/(PM) ² , the sphericity was measured for 100 or more particles, respectively, and the average value was set as the sphericity.

[Example 1]

Preparation of spherical silica particles

로 설정된 반응기 내에 상기 규석 분말을 분사하여 입자상의 실리카를 제조하였다. 제조된 실리카 입자는 평균 입경이 0.65 ㎛, 비표면적이 6.3 ㎡/g이고, 구형도가 0.95인 실리카 입자를 제조하였다.While transporting silicate powder with an average particle diameter of 4.5 μm as a carrier gas, the initial temperature was 1460 in a 7.6 m heating furnace based on the flow of the carrier gas.

Particulate silica was prepared by spraying the silica powder in a reactor set at The prepared silica particles had an average particle diameter of 0.65 μm, a specific surface area of 6.3 m 2 /g, and a sphericity of 0.95.

Preparation of light reflective paint composition

6 g of the prepared silica particles, 19 g of water, 0.3 g of a dispersant, and 0.5 g of an antifoaming agent were mixed and rotated at a speed of 700 rpm for 10 minutes to prepare a silica particle dispersion.

To the prepared dispersion, 21 g of rutile titanium dioxide (R-902) and 18 g of calcium carbonate (SC-10000) were added, followed by stirring at a speed of 1500 rpm for 20 minutes. Then, 33 g of acrylic emulsion, 3 g of dipropylene glycol, 0.2 g of a preservative, and 1 g of a thickener were added and rotated again at 1000 rpm for 30 minutes to prepare a light reflective paint.

[Example 2] A light reflective paint was prepared in the same manner as in Example 1, except that the photocatalyst rutile titanium dioxide having an average particle diameter of 30 to 50 nm was used instead of rutile titanium dioxide (R-902).

[Example 3] A light reflective paint was prepared in the same manner as in Example 1 except that rutile titanium dioxide having an average particle diameter of 1 μm was used instead of rutile titanium dioxide (R-902).

[Example 4] The light reflective paint prepared in Example 1 was applied to a 20Х20 cm iron plate in a thickness of 50 μm and dried for 24 hours to prepare a light reflective coating film.

[Example 5] The light reflective paint prepared in Example 1 was applied to a thickness of 50 μm, and after 3 hours, a pattern plate having an uneven pattern of 0.01 mm in height was pressed on the coating film to prepare a patterned light reflective coating film. did.

[Example 6] The light reflective paint prepared in Example 2 was applied to a 20Х20 cm iron plate in a thickness of 50 μm and dried for 24 hours to prepare a light reflective coating film.

[Example 7] The light reflective paint prepared in Example 3 was applied to a 20Х20 cm iron plate in a thickness of 50 μm and dried for 24 hours to prepare a light reflective coating film.

[Comparative Example 1] A light reflective paint was prepared in the same manner as in Example 1, except that the same amount of rutile titanium dioxide was mixed instead of silica particles.

[Comparative Example 2] A light reflective paint was prepared in the same manner as in Example 1, but by mixing the same amount of silica particles instead of rutile titanium dioxide.

[Comparative Example 3] The light reflective paint prepared in Comparative Example 1 was applied to a 20Х20 cm iron plate in a thickness of 50 μm and dried for 24 hours to prepare a light reflective coating film.

[Comparative Example 4] The light reflective paint prepared in Comparative Example 2 was applied to a thickness of 50 μm on a 20Х20 cm iron plate and cured for 24 hours to prepare a light reflective coating film.

Confirmation of light reflection performance of light reflective coating film

An untreated iron plate (Comparative Example 5), Example 3, Comparative Example 3, and Comparative Example 4 were heated at the same distance with a halogen 100 W lamp, respectively. After one hour, the surface temperature of the coating film was measured using a laser thermometer, and the results are shown in Table 1.

Check the adhesive strength of the light reflective coating film

According to the test method of TEST METHOD B stipulated in ASTM D3359, dry the light-reflecting water-based paint film and place it at 2cm intervals, and then scrape each other 6 at a time with a knife to make 25 flaws and adhere to the area with 3M transparent tape. Then, according to the degree of separation, the standards were determined and evaluated according to the 6 steps in the following table, and are shown in Table 1.

[Table 1]

Confirmation of water resistance of light reflective coating film

The light reflective paints of Example 1, Comparative Example 1 and Comparative Example 2 were tested as follows according to the test method of KS M 6010:2009 of the KS standard.

로 건조시켜 주변을 파라핀으로 발라 싸서 시험편으로 완성하였다. 시험 조작은 KS M ISO 2812－1, KS M ISO 2812－2 과정에 따랐으며, 이 때 시험편 3매는 모두 (20±5)

의 물에 24시간 동안 침지하였다. 침지 후, 첫 번째 관찰에서는 시험편을 꺼낸 즉시 시험편의 중앙을 손가락 끝으로 만져서 도막이 손가락 끝에 묻는지의 여부를 조사하고, 두 번째 관찰에서는 시험편을 2시간 방치한 후에 부풀음, 갈라짐 및 벗겨짐의 유무를 조사하였다.A synthetic resin emulsion type sealer was applied to the smooth surface of three flexible plates (150 mm X 50 mm X 3 mm) and dried for 3 hours to use as a test plate. Next, it was placed in the provided frame and the sample was applied with a steel spatula to form a flat coating film. At this time, the thickness of the coating film was about 0.5 mm for thin coating and 1.5 mm for thick coating. After drying to the touch, remove it from the mold for 7 days (20±1)

It was dried with paraffin and wrapped around it to complete the test piece. The test operation was in accordance with KS M ISO 2812-1 and KS M ISO 2812-2, and at this time, all 3 specimens were (20±5)

immersed in water for 24 hours. After immersion, in the first observation, immediately after taking out the test piece, touch the center of the test piece with your fingertip to check whether the coating film is attached to the fingertip. .

As a result of the experiment, when the light reflective paint was applied and tested according to Example 1, the coating film did not come out on the fingertips in two or more of the three test specimens, but in the specimens according to Comparative Examples 1 and 2, the coating film swelled or the fingertips spillage could be observed.

Long-term durability check of light reflective coating film

The light reflective coating films of Examples 4 and 6 were left in the open air for two weeks in sunlight, and the surface of the coating film was observed. As a result of observation, the light reflective coating film of Example 6 easily peeled off the substrate, which is judged to be a phenomenon due to deterioration of the resin as a result of photocatalytic activity according to the particle size of rutile titanium dioxide.

Check the reflectance of the light reflective coating film

The light reflective paint prepared in Example 1 was commissioned by a testing institution to measure reflectance in the visible and infrared (particularly, near infrared) ranges, and is shown in FIG. 5 . Referring to FIG. 5 , it can be seen that the light reflective paint according to the present invention has excellent reflectivity in the infrared range as well as the visible light range.

As mentioned above, although embodiments of the present invention have been described with reference to the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can implement the present invention in other specific forms without changing its technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10: solar power plant
100: bottom surface
200: solar module
250: support
300: light reflection member
400: plate member

Claims (11)

a solar module installed by a support based on the floor, and capable of double-sided power generation; and
Including; a light reflecting member provided on the bottom surface,
The light reflecting member reflects solar energy emitted from the sun and incident on the light reflecting member,
the light reflective member is a light reflective paint, which is directly painted on the bottom surface, has an average particle diameter of 0.5 to 0.8 μm, a specific surface area of 5 to 9 m^2/g, and a sphericity of 0.8 or more; rutile particles; and an emulsion resin; but, the silica particles have a fluorinated surface,
The light reflective member has a dark color,
The photovoltaic module is an amorphous thin-film type module, characterized in that, photovoltaic power generation facility.
delete delete delete delete delete delete According to claim 1,
The light reflective member, solar power generation facility, characterized in that the solar reflectance of the visible light region and the near-infrared region is 40% or more.
delete delete delete

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