Photocatalytic substance coating material and method for coating photocatalytic substance

Abstract

To provide a photocatalytic substance coating material and a method for coating a photocatalytic substance, that enable stable harmony between respective properties of a photocatalytic substance and a porous material.SOLUTION: A photocatalytic substance coating material 100 comprises a porous material 20 and a photocatalytic substance 10. The porous material 20 has an outer surface 21 including a first region 211 arranged in accordance with a specific pattern and a second region 212 corresponding to the area other than the first region 211. The photocatalytic substance 10 is applied to the first region 211 and is not applied to the second region 212.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present disclosure relates to a photocatalytic substance-coated material and a method for applying a photocatalytic substance. [Background technology]

[0002] Patent Document 1 describes a method for supporting a photocatalyst on a porous material without the use of a binder (bonding agent, etc.). This method prevents the photocatalyst from being embedded in the micropores formed on the surface of the porous material, and also improves the designability of the porous material. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-102567 Summary of the Invention [Problem to be solved by the invention]

[0004] Photocatalytic substances are a general term for substances that absorb light and promote chemical reactions. When exposed to light, oxidation-reduction reactions are promoted, and photocatalytic substances exhibit antibacterial and antiviral effects, as well as deodorizing effects by decomposing surrounding volatile organic compounds (VOCs). However, these effects are not fully realized in dark places. Therefore, photocatalytic materials that can remove VOCs even in dark places have been proposed in combination with porous materials that adsorb VOCs. However, when photocatalytic substances are applied to porous materials, there is a problem in that the photocatalyst penetrates into the micropores formed on the surface of the porous material, inhibiting the porous material's inherent VOC adsorption performance. The "photocatalyst support method" described in Patent Document 1 alleviates this problem. However, the method and timing for attaching a photocatalyst support to the surface of a porous material before curing are somewhat complicated, and it is considered difficult to achieve a stable balance between the performance of the photocatalytic substance and the porous material.

[0005] An object of the present disclosure is to provide a photocatalytic substance coating material and a photocatalytic substance coating method that can stably achieve both the performance of the photocatalytic substance and the performance of the porous material. [Means for solving the problem]

[0006] A photocatalytic substance-coated material according to a first aspect of the present disclosure includes a porous material and a photocatalytic substance. The porous material has an outer surface on which first regions are arranged according to a specific pattern and second regions other than the first regions are arranged. The photocatalytic substance is coated on the first regions and not on the second regions.

[0007] A method for applying a photocatalytic substance according to a second aspect of the present disclosure applies a photocatalytic substance to first regions arranged in a specific pattern on the outer surface of a porous material, using a stencil mask having holes corresponding to the first regions to apply the photocatalytic substance to the first regions.

[0008] A method for applying a photocatalytic material according to a third aspect of the present disclosure applies a photocatalytic material to first regions arranged in a specific pattern on the outer surface of a porous material, using a dispenser to apply the photocatalytic material to the first regions. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to stably achieve both the performance of the photocatalytic substance and the performance of the porous material. [Brief explanation of the drawings]

[0010] [Figure 1A] 1 is a plan view of a photocatalytic substance-coated material 100 according to a first embodiment of the present disclosure. [Figure 1B] FIG. 1B is a cross-sectional view taken along the line IB-IB of FIG. 1A. [Figure 2A] FIG. 1 is a plan view of a photocatalytic substance-coated material 100A according to a first modified example of the first embodiment of the present disclosure. [Figure 2B] FIG. 2B is a cross-sectional view taken along line IIB-IIB of FIG. 2A. [Figure 3]FIG. 10 is a plan view of a photocatalytic substance-coated material 100B according to a second modification of the first embodiment of the present disclosure. [Figure 4] FIG. 10 is a plan view of a photocatalytic substance-coated material 100C according to a third modification of the first embodiment of the present disclosure. [Figure 5] 10 is a flowchart outlining a method for applying a photocatalytic material 10 according to a second embodiment of the present disclosure. [Figure 6] FIG. 2 is a plan view of a porous material 20 on which a stencil mask 30 for a photocatalytic substance-coated material 100 is placed. [Figure 7] FIG. 7 is a cross-sectional view showing the state after the photocatalytic substance 10 has been applied to the porous material 20 of FIG. [Figure 8] FIG. 1 is a plan view of a porous material 20 on which a stencil mask 30A for a photocatalytic substance-coated material 100A is placed. [Figure 9] FIG. 10 is a plan view of a porous material 20 on which a stencil mask 30B for a photocatalytic substance-coated material 100B is placed. [Figure 10] FIG. 10 is a block diagram of a photocatalytic substance application device 50 used in a method for applying a photocatalytic substance 10 according to a third embodiment of the present disclosure. [Figure 11] 10 is a flowchart outlining a method for applying a photocatalytic material 10 according to a third embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] Embodiments of the present disclosure will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and description thereof will not be repeated.

[0012] First Embodiment First, the photocatalytic substance 10 and the porous material 20 that are the basic elements of the photocatalytic substance-coated material 100 will be described, and then the configuration of the photocatalytic substance-coated material 100 will be described.

[0013] 1.1 Photocatalytic material 10 and porous material 20 As mentioned above, photocatalytic material 10 is a general term for a material that absorbs light (especially ultraviolet light) and promotes chemical reactions. When exposed to light, it is possible to carry out chemical reactions at room temperature that are difficult to carry out using ordinary catalytic processes. Because it promotes oxidation-reduction reactions, it is also possible to decompose surrounding organic matter, bacteria, etc. Examples of photocatalytic material 10 include, but are not limited to, titanium oxide (TiO2).

[0014] The porous material 20 is a material with numerous micropores formed on its surface. The porous material 20 exerts a deodorizing effect by capturing odorous substances through the physical adsorption action of the micropores on its surface. Examples of the porous material 20 include, but are not limited to, seashells, coral, diatomaceous earth, pottery, zeolite, silica gel, activated carbon, and beer charcoal.

[0015] 1.2 Configuration of the photocatalytic substance-coated material 100 Next, the configuration of a photocatalytic substance-coated material 100 will be described with reference to Figures 1A and 1B. Figure 1A is a plan view of a photocatalytic substance-coated material 100 according to a first embodiment of the present disclosure. Figure 1B is a cross-sectional view taken along line IB-IB of Figure 1A. For convenience of explanation, Figure 1B exaggerates the thickness of the photocatalytic substance 10 and is not drawn to scale.

[0016] 1A and 1B, the photocatalytic substance-coated material 100 comprises a porous material 20 and a photocatalytic substance 10. The porous material 20 has an outer surface 21 on which first regions 211 arranged according to a specific pattern and second regions 212 other than the first regions 211 are arranged. The photocatalytic substance 10 is coated on the first regions 211, but not on the second regions 212. Note that the specific pattern may be any of a variety of patterns, which will be described later, but excludes patterns corresponding to full coating or full non-coating.

[0017] Therefore, the ratio and arrangement pitch of the first regions 211 and the second regions 212 can be changed according to a specific pattern while ensuring the second regions 212 where the photocatalytic material 10 is not applied. As a result, it is possible to stably achieve both the performance of the photocatalytic material 10 and the performance of the porous material 20.

[0018] In the following description, the first region 211 may be referred to as a "coated region 211" to mean a region to which the photocatalytic material 10 has been applied (or a region to be applied). Similarly, the second region 212 may be referred to as a "non-coated region 212" to mean a region to which the photocatalytic material 10 has not been applied (or a region to which the photocatalytic material 10 will not be applied).

[0019] In this embodiment, the specific pattern is a mesh pattern in which the first regions 211 are arranged in a mesh pattern. Therefore, the respective proportions of the coated regions 211 and the non-coated regions 212, the arrangement pitch, etc. can be changed depending on the specific shape of the specific pattern. As a result, it is possible to more stably achieve both the performance of the photocatalytic material 10 and the porous material 20. The VOC adsorption effect of the non-coated regions 212 increases the VOC concentration in the vicinity, and therefore the activity of the photocatalytic material 10 in the adjacent coated regions 211 also increases.

[0020] 1.3 Modifications 1 to 3 of the First Embodiment Next, several modified examples of the first embodiment will be described with reference to Figs. 2A to 4. Fig. 2A is a plan view of a photocatalytic substance-coated material 100A according to Modification 1 of the first embodiment of the present disclosure. Fig. 2B is a cross-sectional view taken along IIB-IIB in Fig. 2A. Fig. 3 is a plan view of a photocatalytic substance-coated material 100B according to Modification 2 of the first embodiment of the present disclosure. Fig. 4 is a plan view of a photocatalytic substance-coated material 100C according to Modification 3 of the first embodiment of the present disclosure. Note that for convenience of explanation, Fig. 2B also exaggerates the thickness of the photocatalytic substance 10 and is not drawn to scale.

[0021] 2A and 2B, the specific pattern of the photocatalytic substance-coated material 100A may be a stripe pattern in which the first regions 211 are arranged in stripes. Therefore, similar to the above-described photocatalytic substance-coated material 100, the respective proportions and arrangement pitches of the coated regions 211 and non-coated regions 212 can be changed depending on the specific shape of the specific pattern. As a result, it is possible to more stably achieve both the respective performances of the photocatalytic substance 10 and the porous material 20.

[0022] 3, the specific pattern of the photocatalytic substance-coated material 100B may be a pattern in which the first regions 211 are arranged in a convex shape. Therefore, similar to the above-described photocatalytic substance-coated material 100 and photocatalytic substance-coated material 100A, the respective proportions and arrangement pitches of the coated regions 211 and non-coated regions 212 can be changed depending on the specific shape of the specific pattern. As a result, it is possible to more stably achieve both the respective performances of the photocatalytic substance 10 and the porous material 20.

[0023] 4, the specific pattern of the photocatalytic substance-coated material 100C may be a dot pattern in which the first regions 211 are arranged in a dot pattern. Therefore, similar to the above-mentioned photocatalytic substance-coated material 100, photocatalytic substance-coated material 100A, and photocatalytic substance-coated material 100B, the respective proportions and arrangement pitches of the coated regions 211 and non-coated regions 212 can be changed depending on the specific shape of the specific pattern. As a result, it is possible to more stably achieve both the respective performances of the photocatalytic substance 10 and the porous material 20.

[0024] 1.4 Preferred specific patterns and photocatalytic materials 10 The specific pattern described above is composed of lines or dots. It is preferable that the average line width of the lines or the average diameter of the dots is 20 μm or more and 1 cm or less, and the average distance between adjacent lines or dots is 20 μm or more and 1 cm or less. Therefore, the proportions and arrangement pitches of the coated areas 211 and the non-coated areas 212 are appropriately set. As a result, the performance of the photocatalytic material 10 and the porous material 20 can be stably and simultaneously achieved.

[0025] Tungsten oxide (WO3) is more suitable than the above-mentioned titanium oxide as the photocatalytic material 10. Therefore, the photocatalytic material 10 responds to light with a wider wavelength range than titanium oxide. As a result, it is highly effective not only under sunlight containing ultraviolet rays, but also under indoor lighting such as fluorescent lamps and light-emitting diodes.

[0026] Second Embodiment 2.1 Method for applying photocatalytic material 10 (1) Next, with reference to Figs. 5 to 7, a method for applying a photocatalytic substance 10 suitable for manufacturing the above-mentioned photocatalytic substance-coated material 100, photocatalytic substance-coated material 100A, and photocatalytic substance-coated material 100B will be described. Fig. 5 is a flowchart showing an outline of a method for applying a photocatalytic substance 10 according to a second embodiment of the present disclosure. Fig. 6 is a plan view of a porous material 20 on which a stencil mask 30 for the photocatalytic substance-coated material 100 is placed. Fig. 7 is a cross-sectional view showing the state after the photocatalytic substance 10 has been applied to the porous material 20 of Fig. 6. For convenience of explanation, Fig. 7 also exaggerates the thicknesses of the photocatalytic substance 10 and the stencil mask 30 and is not drawn to scale.

[0027] In the method for applying the photocatalytic substance 10 according to the second embodiment, the photocatalytic substance 10 is applied to first regions 211 arranged according to a specific pattern on the outer surface 21 of the porous material 20. In this application method, the photocatalytic substance 10 is applied to the first regions 211 using a stencil mask 30 having holes corresponding to the first regions 211.

[0028] Therefore, the coated areas 211 and non-coated areas 212 are arranged in accordance with the stencil mask 30 to be used, and the photocatalytic material 10 is coated only on the coated areas 211. As a result, it is possible to stably achieve both the performance of the photocatalytic material 10 and the porous material 20 by a process similar to that for a printed circuit board or the like.

[0029] Specifically, as shown in Fig. 5, in step S11, an application device (not shown) used in this application method places a stencil mask 30 on the outer surface 21 of the porous material 20. As a result, the second region 212 of the outer surface 21 is covered with the stencil mask 30, while the first region 211 remains exposed, as shown in Fig. 6. The stencil mask 30 has a large number of regularly arranged diamond-shaped portions, and adjacent diamond-shaped portions are connected to each other by thin strip-shaped portions to form a single unit.

[0030] In step S12, an applicator applies the photocatalytic substance 10 by spraying or the like onto the outer surface 21 of the porous material 20 on which the stencil mask 30 is placed. As a result, the entire outer surface 21 of the porous material 20, including the stencil mask 30, is covered with the photocatalytic substance 10, as shown in Fig. 7. The method of applying the photocatalytic substance 10 is not limited to spraying.

[0031] In step S13, the coating device removes the stencil mask 30 from the outer surface 21 of the porous material 20. As a result, as shown in Figures 1A and 1B above, the first region 211 of the outer surface 21 remains coated with the photocatalytic material 10, but the second region 212 provides the photocatalytic material-coated material 100 in which the outer surface 21 is exposed.

[0032] 2.2 Other examples of stencil mask 30 Next, other examples of the stencil mask 30 will be described with reference to Fig. 8 and Fig. 9. Fig. 8 is a plan view of the porous material 20 on which a stencil mask 30A for a photocatalytic substance-coated material 100A is provided. Fig. 9 is a plan view of the porous material 20 on which a stencil mask 30B for a photocatalytic substance-coated material 100B is provided.

[0033] By carrying out the above-mentioned method for applying the photocatalytic substance 10 using a stencil mask 30A as shown in Fig. 8, a photocatalytic substance-applied material 100A (see Figs. 2A and 2B) in which the first regions 211 are arranged in stripes can be obtained. The stencil mask 30A has a large number of strip-shaped portions arranged in parallel at equal intervals, and the strip-shaped portions are joined together at the left end to form a single unit.

[0034] Furthermore, by carrying out the above-described method for applying the photocatalytic substance 10 using a stencil mask 30B as shown in FIG. 9, a photocatalytic substance-applied material 100B (see FIG. 3) in which the first regions 211 are arranged in a convex shape can be obtained.

[0035] Third Embodiment 3.1 Method for applying photocatalytic material 10 (2) Next, a method for applying a photocatalytic substance 10 suitable for manufacturing the above-mentioned photocatalytic substance-coated material 100C will be described with reference to Fig. 10 and Fig. 11. Fig. 10 is a block diagram of a photocatalytic substance application device 50 used in the method for applying a photocatalytic substance 10 according to a third embodiment of the present disclosure. Fig. 11 is a flowchart showing an outline of the method for applying a photocatalytic substance 10 according to the third embodiment of the present disclosure.

[0036] As shown in FIG. 10, the photocatalytic substance application device 50 includes a control unit 51, a storage unit 52, a two-dimensional scanning unit 53, and a dispenser .

[0037] The control unit 51 controls each unit of the photocatalytic material application device 50. The control unit 51 may be, for example, but is not limited to, a processor or an MPU (Micro Processing Unit). The control unit 51 may be, for example, but is not limited to, an electronic circuit, a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or the like.

[0038] The memory unit 52 stores information and data necessary for controlling each part of the photocatalytic material application device 50. In this photocatalytic material application device 50, the memory unit 52 stores information on the position where the photocatalytic material 10 is to be applied on the outer surface 21 of the porous material 20. The memory unit 52 may also store or store an OS (Operating System) and programs executed by the control unit 51. The memory unit 52 includes memory, specifically, volatile memory and nonvolatile memory. Examples of volatile memory include, but are not limited to, DRAM (Dynamic Random Access Memory) and SRAM (Static Random Access Memory). Examples of nonvolatile memory include, but are not limited to, ROM (Read-Only Memory), flash memory, SSD (Solid State Drive), and hard disk.

[0039] The two-dimensional scanning unit 53 positions the dispenser 54 on the outer surface 21 of the porous material 20 in the X and Y directions.

[0040] The dispenser 54 discharges the photocatalytic substance 10 from its tip, and applies the photocatalytic substance 10 to the outer surface 21 of the porous material 20 .

[0041] In the method for applying the photocatalytic substance 10 according to the third embodiment, the photocatalytic substance 10 is applied to first regions 211 arranged according to a specific pattern on the outer surface 21 of the porous material 20. In this application method, the photocatalytic substance 10 is applied to the first regions 211 using a dispenser 54.

[0042] Therefore, there is no need to prepare a stencil mask or to install and remove the stencil mask on the outer surface 21 of the porous material 20. As a result, the application process is simplified and the degree of freedom in arranging the application area 211 is increased, making it possible to stably achieve both the performance of the photocatalytic material 10 and the performance of the porous material 20. However, the device used to apply the photocatalytic material 10 is not limited to a dispenser.

[0043] Specifically, as shown in FIG. 11, in step S21, the control unit 51 reads out and acquires from the storage unit 52 the next application position of the photocatalytic substance 10 (information on the position to be applied).

[0044] In step S22, the control unit 51 controls the two-dimensional scanning unit 53 to move the dispenser 54 to the next application position read out in step S21.

[0045] In step S23, the control unit 51 causes the dispenser 54 to apply the photocatalytic substance 10.

[0046] In step S24, the control unit 51 determines whether or not application of the photocatalytic substance 10 to all positions to be applied has been completed, and if completed, the process ends, and if not completed, the process returns to step S21.

[0047] The present invention can be embodied in various other forms without departing from its spirit or main features. Therefore, the above-described embodiments are merely illustrative in all respects and should not be interpreted as limiting. The scope of the present invention is defined by the claims and is not limited to the text of the specification. Furthermore, all modifications and variations within the equivalent range of the claims are within the scope of the present invention. [Industrial Applicability]

[0048] The present disclosure can be used for a photocatalytic substance-coated material and a method for applying a photocatalytic substance. [Explanation of symbols]

[0049] 10 Photocatalyst material 20 Porous material 21 Exterior 211 1st area (application area) 212 2nd area (non-applied area) 30, 30A, 30B stencil mask 50 Photocatalytic substance coating device 51 Control section 52 Storage section 53 2D scanning unit 54 Dispenser 100, 100A, 100B, 100C Photocatalytic substance coating material

Claims

1. a porous material having an outer surface on which first regions are arranged according to a specific pattern and second regions other than the first regions are arranged; Photocatalytic substances and Equipped with The photocatalytic substance-coated material is coated on the first region and not on the second region.

2. The photocatalytic substance-coated material according to claim 1 , wherein the specific pattern is a mesh pattern in which the first regions are arranged in a mesh pattern.

3. 2. The photocatalytic substance-coated material according to claim 1, wherein the specific pattern is a stripe pattern in which the first regions are arranged in stripes.

4. The photocatalytic substance-coated material according to claim 1 , wherein the specific pattern is a dot pattern in which the first regions are arranged in a dot pattern.

5. the specific pattern is composed of lines or dots, the average line width of the lines or the average diameter of the dots is 20 μm or more and 1 cm or less; the average distance between adjacent lines or dots is 20 μm or more and 1 cm or less; The photocatalytic substance-coated material according to any one of claims 1 to 4.

6. The photocatalytic substance-coated material according to claim 1 , wherein the photocatalytic substance includes tungsten oxide.

7. A method for applying a photocatalytic substance to first regions arranged according to a specific pattern on an outer surface of a porous material, the method comprising: A method for applying a photocatalytic substance, which uses a stencil mask having holes corresponding to the first regions to apply the photocatalytic substance to the first regions.

8. A method for applying a photocatalytic substance to first regions arranged according to a specific pattern on an outer surface of a porous material, the method comprising: A method for applying a photocatalytic substance, comprising applying the photocatalytic substance to the first region using a dispenser.

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