Covering sheet and method for supplying carbon dioxide

Abstract

To provide a covering sheet that can supply carbon dioxide to a subject in various situations or scenes regardless of an installing site.SOLUTION: A covering sheet has a sheet-shaped first substrate and a carbon dioxide adsorbing / releasing layer containing an amine compound which adsorbs / releases carbon dioxide, wherein the carbon dioxide adsorbing / releasing layer is provided for one surface of the first substrate. A method for supplying carbon dioxide, by using a covering sheet in which a carbon dioxide adsorbing / releasing layer containing an amine compound which adsorbs / releases carbon dioxide is provided for one surface of a sheet-shaped substrate, allows the covering sheet to adsorb carbon dioxide in the atmosphere, allows the covering sheet to release carbon dioxide at a temperature higher than a temperature at which carbon dioxide is adsorbed in a state where a subject is covered by the covering sheet to supply carbon dioxide to the subject.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a coating sheet and a carbon dioxide supply method. [Background technology]

[0002] In agriculture, greenhouse horticulture is practiced to achieve high quality and high yields of crops, and greenhouse cultivation techniques have been developed and spread. One well-known greenhouse cultivation technique is the application of carbon dioxide to facilities such as greenhouses. One known carbon dioxide application technique is a carbon dioxide supply device that removes harmful substances from exhaust gases from heating systems and reuses the carbon dioxide in the exhaust gases (Patent Document 1).

[0003] Furthermore, as a carbon dioxide application technology, a carbon dioxide concentrator is known that concentrates carbon dioxide in the air and supplies the concentrated carbon dioxide to a greenhouse (Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-041649 [Patent Document 2] International Publication No. 2014 / 185445 Summary of the Invention [Problem to be solved by the invention]

[0005] Since exhaust gas is used as a carbon dioxide supply source, processing equipment is required to remove harmful substances or concentrate carbon dioxide from the atmosphere, which requires energy from an external power source, etc. Therefore, when installing such equipment, an external power source must be secured, and installation locations are limited, especially when installing outdoors.

[0006] A method of applying carbon dioxide without using an external power source is to place a carbon dioxide pressure-resistant container within a facility, dilute the carbon dioxide from the pressure-resistant container, store it within the facility, and supply the carbon dioxide to the target. However, in agriculture that does not use a facility, such as outdoors, it is difficult to supply carbon dioxide from a carbon dioxide pressure-resistant container because carbon dioxide cannot be stored in one place. Furthermore, even if a facility for storing carbon dioxide is set up on outdoor farmland, it takes time and costs to set up the facility.

[0007] One of the objectives of the embodiments of the present invention is to provide a covering sheet that can supply carbon dioxide to an object regardless of the installation location. Another objective is to provide a covering sheet that can supply carbon dioxide to an object without using an energy source such as an external power source. One of the objectives of the embodiments of the present invention is to provide a carbon dioxide supply method that can supply carbon dioxide to an object regardless of the installation location. Another objective is to provide a carbon dioxide supply method that can supply carbon dioxide to an object without using an energy source such as an external power source. [Means for solving the problem]

[0008] A coating sheet according to one embodiment of the present invention has a sheet-like first substrate and a carbon dioxide adsorption / release layer containing an amine compound that adsorbs and releases carbon dioxide, and the carbon dioxide adsorption / release layer is provided on one surface of the first substrate.

[0009] The first substrate may have a plurality of holes that allow gas to pass through.

[0010] The plurality of holes may have a pore size of 0.1 μm to 50 μm.

[0011] The plurality of holes may extend through the thickness of the first substrate.

[0012] The carbon dioxide adsorption / release layer may be interspersed on the first substrate.

[0013] A porous second substrate may be attached to one surface of the first substrate, and the carbon dioxide adsorption / release layer may be provided on the second substrate instead of on one surface of the first substrate.

[0014] A carbon dioxide supply method according to one embodiment of the present invention uses a coating sheet having a carbon dioxide adsorption / release layer, which contains an amine compound that adsorbs and releases carbon dioxide, provided on one side of a sheet-like substrate, and causes the coating sheet to adsorb carbon dioxide from the atmosphere. With an object covered with the coating sheet, the carbon dioxide is released from the coating sheet at a temperature higher than the temperature at which the carbon dioxide was adsorbed, thereby supplying carbon dioxide to the object.

[0015] The object can be made to adsorb carbon dioxide in the atmosphere while covered with the covering sheet.

[0016] Carbon dioxide can be released by exposing the covering sheet to sunlight.

[0017] A heat source can be inserted between the object and the covering sheet, and carbon dioxide can be released by the heat of the heat source.

[0018] The object may be soil in which plants are grown. [Effects of the Invention]

[0019] According to the covering sheet of one embodiment of the present invention, a carbon dioxide adsorption / release layer containing an amine compound that adsorbs and releases carbon dioxide is provided on a sheet-like substrate, so that carbon dioxide can be supplied to an object in a variety of situations and occasions regardless of the installation location. According to the carbon dioxide supply method of one embodiment of the present invention, an object is covered with a covering sheet in which a carbon dioxide adsorption / release layer containing an amine compound that adsorbs and releases carbon dioxide is provided on a sheet-like substrate, and carbon dioxide is adsorbed and released by utilizing a temperature difference, so that carbon dioxide can be supplied to an object in a variety of situations and occasions regardless of the installation location. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a top view showing the configuration of a covering sheet according to an embodiment of the present invention. [Figure 2] 1 is a top view showing the configuration of a covering sheet according to an embodiment of the present invention. [Figure 3] 1 is an end view showing the configuration of a covering sheet according to an embodiment of the present invention. [Figure 4] FIG. 2 is an end view showing the configuration of a first base material according to one embodiment of the present invention. [Figure 5] FIG. 2 is an end view showing the configuration of a first base material according to one embodiment of the present invention. [Figure 6] 1 is an end view showing the configuration of a covering sheet according to an embodiment of the present invention. [Figure 7] 1 is an end view showing the configuration of a covering sheet according to an embodiment of the present invention. [Figure 8] 1 is a flowchart showing a carbon dioxide supply method according to one embodiment of the present invention. [Figure 9] FIG. 1 is an end view illustrating a carbon dioxide supply method according to an embodiment of the present invention. [Figure 10] FIG. 1 is an end view illustrating a carbon dioxide supply method according to an embodiment of the present invention. [Figure 11] FIG. 1 is an end view illustrating a carbon dioxide supply method according to an embodiment of the present invention. [Figure 12] FIG. 1 is a diagram showing an example of use of a carbon dioxide supply method according to one embodiment of the present invention. [Figure 13] FIG. 1 is a diagram showing an example of use of a carbon dioxide supply method according to one embodiment of the present invention. [Figure 14] FIG. 1 is a diagram showing an example of use of a carbon dioxide supply method according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] The present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to the description of the following embodiments. Furthermore, the components in the following embodiments include those that are replaceable and easy for a person skilled in the art, or those that are substantially identical. Furthermore, the components in the embodiments described below can be variously omitted, replaced, or modified without departing from the gist of the present disclosure. In the following embodiments, components necessary for illustrating the embodiments of the present disclosure will be described, and other components will be omitted.

[0022] First Embodiment A coating sheet 10 according to one embodiment of the present invention will be described with reference to FIGS.

[0023] (covering sheet) Fig. 1 is a top view showing the configuration of a coating sheet according to one embodiment of the present invention. Fig. 2 is a top view showing the configuration of a coating sheet according to one embodiment of the present invention. Figs. 3 to 5 are end views showing the configuration of a first substrate according to one embodiment of the present invention. As shown in Figs. 1 to 3, the coating sheet 10 has a sheet-like first substrate 100 and a carbon dioxide adsorption / release layer 200 containing an amine compound that adsorbs and releases carbon dioxide.

[0024] (First substrate) The first substrate 100 is thin and sheet-like, with a large area. Because the first substrate 100 is thin, it can be folded or rolled up, and because it is lightweight, it is easy to carry. In addition, because the first substrate 100 is flexible enough to be folded or rolled up, it can be deformed to fit various shapes of the object to be coated.

[0025] The first substrate 100 is sheet-shaped and has a large area, making it easy to cover objects that occupy a large area or have a large volume. For example, the first substrate 100 can cover a large, narrow area of ​​land, such as a ridge, as an object that occupies a large area. Furthermore, the first substrate 100 can cover, for example, alkaline soil, building materials, waste materials, or concrete buildings as an object that occupies a large volume.

[0026] The first substrate 100 can be shaped to fit the size and shape of the object to be covered. For example, if the soil in which the plants are planted is circular, the first substrate 100 can be made circular to fit the shape of the soil. Furthermore, when covering a wide area or a large object, the covering sheets 10 can be joined together.

[0027] 2 is an enlarged view of region 100A of the first substrate shown in FIG. 1. The first substrate 100 has a plurality of holes 102. The plurality of holes 102 allows gas to pass through. It is particularly preferable that the plurality of holes 102 allows carbon dioxide to pass through. In addition to carbon dioxide, examples of the gas include nitrogen, oxygen, hydrogen, argon, carbon monoxide, sulfur oxides, and nitrogen oxides.

[0028] The shape of the plurality of holes 102 may be, but is not limited to, a circle having a hole diameter 102W as shown in Fig. 2. Although the plurality of holes 102 are all shown to have the same size and shape in Fig. 2, they may be different sizes and shapes.

[0029] The plurality of holes 102 can penetrate the first base material 100 in the thickness direction (for example, the Y direction shown in FIG. 3). FIGS. 3 to 5 are end views showing the region 100A of the first base material shown in FIG. 3. The shape of the plurality of holes 102 may be cylindrical with a hole diameter 102W as shown in FIGS. 3 to 5, or may have a shape in which the hole diameter 102W changes, such as a truncated cone.

[0030] The plurality of holes 102 only needs to have a hole diameter that allows gas to pass through. Specifically, the hole diameter 102W of the plurality of holes 102 is preferably 0.1 μm to 50 μm. In this way, when the hole diameter 102W is 0.1 μm to 50 μm, the plurality of holes 102 can allow gas to pass through. Furthermore, when the first base material 100 has such a plurality of holes 102, the first base material 100 can allow gas to pass through without using a fan or air blower.

[0031] 4 shows the plurality of holes 102 as holes penetrating from one surface to the other surface of the first substrate 100, but the plurality of holes 102 are not limited to this shape. The first substrate 100 may be formed of a porous material having numerous small holes or voids formed therein, or may be formed of a fibrous material. Alternatively, the first substrate 100 may have a filter-like shape.

[0032] The first base material 100 may be made up of multiple layers. While Fig. 3 shows an example in which the first base material 100 is made up of a single layer, it may have a structure in which multiple layers each having a plurality of holes 102 are stacked.

[0033] When the first substrate 100 has a structure in which multiple layers are stacked, the multiple holes 102 provided in each of the multiple layers are configured to overlap and penetrate in the thickness direction of the first substrate 100. In this case, the gas can pass through the first substrate 100 so as to diffuse in the thickness direction of the multiple layers. The multiple layers of the first substrate 100 are stacked at intervals that allow the gas to pass through the multiple holes 102.

[0034] The first substrate 100 is preferably made of a light-absorbing material. Examples of light-absorbing materials include materials that can absorb visible light or infrared light. By using a light-absorbing material for the first substrate 100, the temperature of the first substrate 100 can be increased. By placing the first substrate 100 outdoors, the temperature can be increased mainly during hours when the sun is out. However, the temperature of the first substrate 100 only needs to be increased to a temperature at which the amine compound contained in the carbon dioxide adsorption / release layer 200, which will be described later, can release carbon dioxide.

[0035] The first substrate 100 may contain a light-absorbing material. For example, if the first substrate 100 is composed of multiple layers, some of the multiple layers may be made of a light-absorbing material. The first substrate 100 may contain a light-absorbing material. By including a light-absorbing material in the first substrate 100, the first substrate 100 changes color to one that is more likely to absorb light, as will be described later, which is preferable.

[0036] The first substrate 100 may be made of a light-transmitting material. By using a light-transmitting material for the first substrate 100, the first substrate 100 can allow, for example, sunlight to reach the carbon dioxide adsorption and release layer 200. When sunlight reaches the carbon dioxide adsorption and release layer 200, the carbon dioxide adsorption and release layer 200 can be directly heated, and the temperature of the carbon dioxide adsorption and release layer 200 can be increased. The temperature of the carbon dioxide adsorption and release layer 200 can be defined as the temperature of the coating sheet 10.

[0037] The material used for the first substrate 100 may be, for example, at least one of vinyl, plastic film, polyester, cotton, and linen, but is not particularly limited to these.

[0038] As described above, the color of the first base material 100 may be any color that easily absorbs light, and is preferably black. As a method for making the color of the first base material 100 black, for example, a method of dispersing carbon fine particles in the first base material 100 can be mentioned.

[0039] The first substrate 100 may have a structure that promotes light absorption. An example of a structure that promotes light absorption is a structure having a plurality of minute protrusions or recesses with a height of 0.1 μm to 1 μm on the surface that reduces reflectance. When the surface of the first substrate 100 has minute recesses or protrusions, it is possible to reduce surface reflection of light and confine light within the recesses or protrusions. As a result, it is possible to increase the light absorptance of the first substrate 100. By increasing the light absorptance in this way, it is possible to increase the temperature rise of the first substrate 100.

[0040] In the present disclosure, "the first substrate 100 allows gas to pass through" refers to gas passing through the multiple pores 102 of the first substrate 100. Furthermore, "the first substrate 100 allows gas to pass through" also includes gas passing through the first substrate 100. For example, it also includes gas passing through the first substrate 100, such as when a material such as vinyl is used for the first substrate 100. In this case, when a material such as vinyl is used for the first substrate 100, multiple pores 102 may be intentionally provided to increase gas permeability. Gas permeability can be increased by providing through-holes as the multiple pores 102 in a sheet-like first substrate 100 made of vinyl. Furthermore, even when the first substrate 100 is formed of a porous material, gas permeability can be increased by providing holes penetrating the substrate as the multiple pores 102.

[0041] (carbon dioxide absorption / release layer) The carbon dioxide absorption / release layer 200 is provided on one surface of the first substrate 100. The carbon dioxide absorption / release layer 200 can be formed by being laminated on the first substrate 100, for example, as shown in Fig. 3. The carbon dioxide absorption / release layer 200 may also be laminated so as to cover the entire first substrate 100, as shown in Fig. 1.

[0042] The carbon dioxide absorption-release layer 200 may comprise a portion of the first substrate 100. The carbon dioxide absorption-release layer 200 may be provided in some of the plurality of pores 102 of the first substrate 100. The carbon dioxide absorption-release layer 200 is provided partially in the plurality of pores 102 near the surface of the first substrate 100. Although FIG. 3 shows the carbon dioxide absorption-release layer 200 provided with a uniform thickness on the first substrate 100, the carbon dioxide absorption-release layer 200 may have a non-uniform thickness because the carbon dioxide absorption-release layer 200 is provided partially in the plurality of pores 102.

[0043] The carbon dioxide absorption and release layers 200 may be scattered on the first substrate 100. The carbon dioxide absorption and release layers 200 may be arranged at intervals from one another on the first substrate 100. The carbon dioxide absorption and release layers 200 may be arranged regularly or irregularly. The carbon dioxide absorption and release layers 200 may be the same size or different sizes in a plan view. The shape of the carbon dioxide absorption and release layers 200 may be circular, rectangular, polygonal, or the like. By scattering the carbon dioxide absorption and release layers 200 on the first substrate 100, the carbon dioxide absorption and release layers 200 can remain fixed to the first substrate 100 even if the first substrate 100 is moved, for example, when folded.

[0044] The carbon dioxide absorption / release layer 200 contains an amine compound that adsorbs and releases carbon dioxide. The carbon dioxide absorption / release layer 200 can use a substrate that holds the amine compound. The substrate can be a porous substrate or resin that can disperse and hold the amine compound. For example, polyolefin, zeolite, or silica can be used. The color of the carbon dioxide absorption / release layer 200 can be a color that easily absorbs light. The color of the carbon dioxide absorption / release layer 200 is preferably black. By making the carbon dioxide absorption / release layer 200 black, it is possible to absorb light that has passed through the first substrate 100 and increase the temperature of the carbon dioxide absorption / release layer 200. One method for making the carbon dioxide absorption / release layer 200 black is to disperse carbon particles in the carbon dioxide absorption / release layer 200.

[0045] The amine compound used in this embodiment is a compound that can adsorb carbon dioxide at low temperatures and release carbon dioxide at high temperatures. Note that the amine compound used in this embodiment may absorb carbon dioxide instead of adsorbing it at low temperatures. The terms "low temperature" and "high temperature" refer to temperatures that can be appropriately determined depending on the characteristics of the amine compound used. "Low temperature" refers to the temperature range in which the carbon dioxide adsorption / release layer 200 can adsorb carbon dioxide, and "high temperature" refers to the temperature range in which carbon dioxide can be released. In other words, "low temperature" refers to a temperature below the highest temperature observed in Japan as meteorological data (e.g., 41.1°C, August 17, 2020), and "high temperature" refers to a temperature above 50°C. The amine compound that can be used in this embodiment may be a known amine compound that adsorbs and releases carbon dioxide, such as the compounds described in International Publication No. 2022 / 085789. Alternatively, instead of an amine compound, a known porous metal-organic framework that adsorbs and releases carbon dioxide may be used, such as the porous metal-organic framework described in JP-A-2023-158570.

[0046] (Variation 1) The following describes a modified example of the covering sheet 10. Fig. 6 is an end view showing the configuration of a covering sheet according to one embodiment of the present invention.

[0047] The carbon dioxide adsorption / release layer 200 may be provided on the second substrate 150 instead of on one surface of the first substrate 100. The second substrate 150 is a porous substrate that can support the carbon dioxide adsorption / release layer 200. The second substrate 150 provided with the carbon dioxide adsorption / release layer 200 is attached to one surface of the first substrate 100.

[0048] The porous substrate can be a substrate having pores capable of supporting an amine compound or a substrate in which an amine compound is dissolved or dispersed. Examples of the porous substrate include nonwoven fabrics, woven fabrics, polyolefins, zeolites, silica, and porous metal-organic frameworks. By using a porous second substrate 150 in this way, the porous second substrate 150 can contain a larger amount of the carbon dioxide adsorption / release layer 200, thereby allowing a larger amount of the amine compound in the carbon dioxide adsorption / release layer 200 to be provided in the coating sheet 10. Furthermore, by using a porous second substrate 150, the coating sheet 10 can be manufactured without the step of providing the carbon dioxide adsorption / release layer 200 on the first substrate 100.

[0049] (Variation 2) The following describes a modified example of the covering sheet 10. Fig. 7 is an end view showing the configuration of a covering sheet according to one embodiment of the present invention.

[0050] The covering sheet 10 can have a plurality of carbon dioxide adsorption / release layers 200. As shown in Fig. 7, the carbon dioxide adsorption / release layer 200-1 and the carbon dioxide adsorption / release layer 200-2 can be arranged so as to sandwich the first substrate 100 therebetween.

[0051] As described above, the covering sheet 10 can supply carbon dioxide to an object in a variety of situations and occasions regardless of installation location by forming the carbon dioxide adsorption / release layer 200 containing an amine compound that adsorbs and releases carbon dioxide on the surface of the sheet-like first substrate 100. Furthermore, the covering sheet 10 can supply carbon dioxide to an object without using an energy source such as an external power source.

[0052] Second Embodiment In this embodiment, a carbon dioxide supplying method using the covering sheet 10 will be described with reference to Figs. 8 to 13. Fig. 8 is a flowchart showing a carbon dioxide supplying method according to one embodiment of the present invention. Figs. 9 to 11 are diagrams showing a carbon dioxide supplying method according to one embodiment of the present invention. Figs. 12 to 14 are diagrams showing examples of use of the carbon dioxide supplying method according to one embodiment of the present invention.

[0053] (Carbon dioxide supply method) In step 100 (S100), a coating sheet 10 is used, in which a carbon dioxide adsorption / release layer 200 containing an amine compound that adsorbs and releases carbon dioxide is provided on one surface of a sheet-like first substrate 100, and carbon dioxide in the atmosphere is adsorbed onto the coating sheet 10. The amine compound that adsorbs and releases carbon dioxide has the function of adsorbing carbon dioxide at a temperature lower than a first temperature and releasing the adsorbed carbon dioxide at a second temperature. The first temperature is lower than the second temperature. For example, as shown in FIG. 9 , when the air temperature drops below the temperature (first temperature) at which the amine compound adsorbs carbon dioxide and light such as sunlight is no longer irradiated, the temperature of the carbon dioxide adsorption / release layer 200 drops below the first temperature. As a result, carbon dioxide (CO2) contained in gas passing through the pores 102 of the first substrate 100 is adsorbed by the amine compound of the carbon dioxide adsorption / release layer 200 and accumulated in the carbon dioxide adsorption / release layer 200. Furthermore, carbon dioxide (CO 2 ) contained in the gas is adsorbed by the amine compound of the carbon dioxide sorption / release layer 200 from the surface opposite to the surface facing the first substrate 100 and accumulated in the carbon dioxide sorption / release layer 200 .

[0054] In step 200 (S200), while the object is covered with the covering sheet 10, carbon dioxide is released from the covering sheet 10 at a temperature higher than the temperature at which the carbon dioxide was adsorbed, thereby supplying the carbon dioxide to the object. For example, as shown in FIG. 10 , the first substrate 100 adsorbs heat from the natural environment, such as sunlight (indicated by the open arrow in FIG. 10 ), and the heat is transferred to the carbon dioxide absorption / release layer 200 (indicated by the wavy arrow in FIG. 10 ), causing the temperature of the carbon dioxide absorption / release layer 200 to rise. When the temperature (T) of the carbon dioxide absorption / release layer 200 reaches a temperature (second temperature) at which carbon dioxide is released, the amine compound contained in the carbon dioxide absorption / release layer 200 releases carbon dioxide (CO2). At this time, the carbon dioxide is released from the carbon dioxide absorption / release layer 200 directly or through the holes 102, as shown in FIG. 10 .

[0055] In step 200 (S200), the temperature of the carbon dioxide absorption and release layer 200 may be increased by directly absorbing natural energy such as sunlight. As shown in Fig. 11, sunlight passes through the first substrate 100 (white arrows in Fig. 11), and the carbon dioxide absorption and release layer 200 absorbs the solar energy, thereby increasing the temperature (T) of the carbon dioxide absorption and release layer 200. For example, by dispersing a material that absorbs sunlight and converts it to heat, such as carbon black, in the carbon dioxide absorption and release layer 200, the temperature of the carbon dioxide absorption and release layer 200 itself can be increased to the carbon dioxide release temperature by irradiating it with sunlight.

[0056] Steps 100 and 200 may be repeatedly executed. For example, as shown in FIGS. 12 to 14 described below, steps 100 and 200 may be repeatedly executed until the plant 700 has grown sufficiently. Alternatively, if the object is alkaline soil, steps 100 and 200 may be repeatedly executed until the alkaline soil is neutralized. Furthermore, if the object is concrete, steps 100 and 200 may be repeatedly executed until the concrete is carbonated.

[0057] As described above, the carbon dioxide supply method can supply carbon dioxide to an object in various situations and scenes regardless of the location of the object by using the covering sheet 10. Furthermore, the carbon dioxide supply method can supply carbon dioxide to an object without using an energy source such as an external power source.

[0058] Next, the carbon dioxide supply method will be described using a specific example of use. Figures 12 to 14 are diagrams showing an example of use of the carbon dioxide supply method according to one embodiment of the present invention.

[0059] (Example of use) FIG. 12 shows an example in which the target object is soil in which plants are grown. As shown in FIG. 12, soil 300 in which plants 700 are planted is covered with a covering sheet 10, and the temperature of the covering sheet 10 is lowered to a temperature (first temperature) at which the amine compound adsorbs carbon dioxide. When the temperature of the covering sheet 10 drops below the first temperature, the carbon dioxide adsorption / release layer 200 adsorbs carbon dioxide 800 in the atmosphere. At this time, it is preferable to adsorb carbon dioxide in the atmosphere while the target object is covered with the covering sheet. By adsorbing carbon dioxide 800 in the atmosphere while the target object is covered with the covering sheet, more carbon dioxide can be accumulated inside the covering sheet 10.

[0060] Natural cooling is a preferred method for lowering the temperature of the covering sheet 10. For example, as shown in Fig. 12, the temperature of the covering sheet 10 may be lowered at night when the air temperature drops. By allowing the covering sheet 10 to cool naturally at night when it is not exposed to sunlight, the temperature of the covering sheet 10 can be lowered. This cooling method does not require a special cooling device or an external power source, and therefore, there are no restrictions on the installation location, and an environmentally friendly carbon dioxide supply method can be provided.

[0061] Next, as shown in Figure 13, with the soil 300 covered with the covering sheet 10, the temperature of the carbon dioxide absorption and release layer 200 is raised to a temperature (second temperature) at which the amine compound releases carbon dioxide. The temperature at which the amine compound releases carbon dioxide is higher than the temperature at which the amine compound adsorbs carbon dioxide. When the temperature of the carbon dioxide absorption and release layer 200 becomes higher than the second temperature, the carbon dioxide absorption and release layer 200 releases the carbon dioxide adsorbed at low temperatures. The released carbon dioxide is supplied to the plant 700.

[0062] A preferred method for increasing the temperature of the carbon dioxide absorption and release layer 200 is to use air temperature. For example, as shown in FIG. 13 , it is preferred to expose the covering sheet 10 to sunlight to increase the temperature of the carbon dioxide absorption and release layer 200 and release carbon dioxide from the carbon dioxide absorption and release layer 200. By using air temperature to increase the temperature of the carbon dioxide absorption and release layer 200, no device or the like is required to heat the carbon dioxide absorption and release layer 200.

[0063] However, if the temperature of the carbon dioxide adsorption / release layer 200 does not rise above the second temperature due to bad weather or other reasons, a heat source may be inserted between the object and the covering sheet, and carbon dioxide may be released using the heat of the heat source. As a method for heating the covering sheet 10 using the heat of the heat source, for example, as shown in Fig. 14, a pipe 900 through which hot water flows may be installed between the soil 300 and the covering sheet 10.

[0064] The above-described embodiments of the present invention can be combined as appropriate as long as they are not mutually inconsistent. A product in which a person skilled in the art appropriately adds or deletes components or modifies the design based on each embodiment is also included within the scope of the present invention as long as it includes the gist of the present invention.

[0065] Even if there are other effects and advantages different from those brought about by the above-described embodiments, those that are clear from the description in this specification or that can be easily predicted by a person skilled in the art are naturally understood to be brought about by the present invention. [Explanation of symbols]

[0066] 10: Covering sheet, S100: Step 100, 100: First substrate, 100A: Area, 102: Hole, 102W: Hole diameter, 150: Second substrate, 200: Carbon dioxide adsorption / release layer, S200: Step 200, 200-1: Carbon dioxide adsorption / release layer, 200-2: Carbon dioxide adsorption / release layer, 300: Soil, 700: Plant, 800: Carbon dioxide, 900: Pipe

Claims

1. a sheet-like first substrate; a carbon dioxide adsorption / release layer containing an amine compound that adsorbs and releases carbon dioxide, The carbon dioxide adsorption / release layer is provided on one surface of the first substrate. Covering sheet.

2. The first substrate has a plurality of holes that allow gas to pass through. The coating sheet according to claim 1 .

3. The pore diameter of the plurality of pores is 0.1 μm to 50 μm. The coating sheet according to claim 2 .

4. The plurality of holes penetrate the first base material in a thickness direction. The coating sheet according to claim 2 .

5. The carbon dioxide adsorption / release layer is interspersed on the first substrate. The coating sheet according to claim 1 .

6. a porous second substrate is attached to the one surface of the first substrate; The carbon dioxide adsorption / release layer is provided on the second substrate instead of on one surface of the first substrate. The coating sheet according to claim 1 .

7. A coating sheet is used, in which a carbon dioxide adsorption / release layer containing an amine compound that adsorbs and releases carbon dioxide is provided on one surface of a sheet-like substrate, carbon dioxide in the atmosphere is adsorbed onto the coating sheet; In a state where the object is covered with the covering sheet, carbon dioxide is released from the covering sheet at a temperature higher than the temperature at which the carbon dioxide was adsorbed, thereby supplying carbon dioxide to the object. Carbon dioxide supply method.

8. The object is covered with the covering sheet, and carbon dioxide in the atmosphere is adsorbed. The carbon dioxide supply method according to claim 7.

9. The carbon dioxide is released by exposing the covering sheet to sunlight. The carbon dioxide supply method according to claim 7.

10. A heat source is inserted between the object and the covering sheet, and the carbon dioxide is released by the heat of the heat source. The carbon dioxide supply method according to claim 7.

11. The carbon dioxide supply method according to claim 7 , wherein the object is soil in which plants are grown.

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