JP2016107263A - Waterproof material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a general-purpose binder liquid not depending on the kinds of rust protection objects.SOLUTION: Provided is a binder liquid for a photocatalyst coating agent comprising: a liquid including a photocatalytic particles; and an inorganic polymer liquid having waterproofness, each photocatalytic particle being a bound matter of a flat crystal particle and a cubic crystal particle having a thickness to the flat crystal particle, being a photocatalytic particle capable of obtaining photocatalytic activity by visible light, and the inorganic polymer liquid includes amorphous silica and silicone.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a waterproof material, and more particularly to a waterproof material using a photocatalyst.

  Patent Document 1 discloses an antifouling outdoor waterproof sheet in which a photocatalyst is applied to a resin coating without a binder, the cost is low, welder processability is good, and light weight can be secured. This waterproof sheet is a sheet having a resin coating on at least one surface of a fiber substrate, and at least one surface of the resin coating has at least one selected from a hydrophilic apatite-coated photocatalyst and a hydrophilic silica-coated photocatalyst. A photocatalyst is present, the average primary particle diameter of the photocatalyst is 1 nm or more and less than 100 nm, and the photocatalyst has a thickness of the average primary particle diameter or more and less than 500 nm, and occupies at least 20 area% of the coated surface in the whole surface or in the form of dots It is said that the photocatalyst is adsorbed and fixed and supported on the surface of the resin film, and can be subjected to an adhesive molding process by a welder process.

  Further, as an antifouling waterproof sheet, an antifouling treatment using a photocatalyst carried by attaching a hydrophilic coating containing a photocatalyst to the surface or carrying a thermocompression bonding of photocatalyst particles on the entire waterproof coating is also becoming widespread. Patent Document 1 discloses this.

JP 2007-16338 A

Here, as disclosed in Patent Document 1, the photocatalyst has an anticorrosion effect, and in addition, has a rust prevention effect. However, when applying a photocatalyst to a metal surface, it has been found that depending on the conditions of the photocatalyst or the metal surface, it is difficult to form the photocatalyst coating under conditions that do not separate from the metal surface.
In addition, when moisture present in the surrounding atmosphere, for example, rain, snow, moisture from outdoor unit cooling mist, etc. exceeds the photocatalyst coating and comes into contact with the coating target, the coating target is not affected by the presence of the photocatalytic coating. Sometimes it rusted or was attacked.

  For this reason, the present inventor tried to form a photocatalyst coating in a superimposed manner after forming a binder layer by applying a commercially available binder liquid prior to the formation of the photocatalyst coating.

  As a result, it was found that there is no general-purpose binder liquid, such as a binder liquid that can be used is limited, or an effective binder liquid cannot be found. When an inorganic binder liquid is selected, it is difficult to obtain a binder layer that does not crack depending on the type. Therefore, the coating target may be rusted or eroded despite the presence of the binder layer.

  Then, this invention makes it a subject to provide the versatile binder liquid which does not depend on the classification of rust prevention object.

  In order to solve the above problems, the binder liquid for a photocatalyst coating agent of the present invention contains an inorganic polymer liquid having waterproofness. The inorganic polymer liquid contains amorphous silica and silicone. The remainder is preferably moisture.

  Moreover, the binder liquid for photocatalyst coating agents of this invention may further contain the liquid containing a photocatalyst particle other than the inorganic polymer liquid which has waterproofness.

  The photocatalyst particles may be a combination of flat crystal particles and solid crystal particles having a thickness with respect to the flat crystal particles. In addition, the photocatalyst particles can have photocatalytic activity by visible light.

  In the air conditioner outdoor unit of the present invention, the photocatalyst coating formed by the liquid containing the photocatalyst particles is applied on the binder layer formed by the binder liquid for the photocatalyst coating agent.

  Furthermore, the photocatalyst coating construction method of the present invention forms a binder layer with the above-mentioned binder solution for a photocatalyst coating agent, and forms a photocatalyst coating with a liquid containing the photocatalyst particles on the binder layer.

  Any one of the above-described particles has a structural defect in a crystalline state, for example, in order to narrow the band gap so that photocatalytic activity can be obtained by visible light.

  It is preferable that the average size of the flat crystal particles is equal to or greater than the average size of the three-dimensional crystal particles, since this contributes to a decrease in the porosity of the photocatalyst film when the photocatalyst-containing body is applied and dried.

  Specifically, the porosity of the photocatalyst after coating and drying is preferably 50% or less. This is because the number of crystals per unit volume of the optical medium is increased, which contributes to reducing the recombination rate.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, a binder solution for a photocatalyst coating agent according to an embodiment of the present invention and a method for applying a photocatalyst coating using the same will be described with reference to the drawings.

  First, the photocatalyst coating agent binder liquid of this embodiment and a photocatalyst coating method using the same will be outlined. In addition, the same code | symbol is attached | subjected to the same part in each drawing.

  First, a binder solution for a photocatalyst coating agent produced by a method to be described later is sprayed on an application target using a sprayer (so-called aerosol). Thereafter, the binder solution for the photocatalyst coating agent is dried at room temperature or by applying warm air of, for example, 100 ° C. or less, and a so-called binder layer is formed on the application target.

  Next, a liquid containing photocatalytic particles that can obtain photocatalytic activity by visible light is sprayed onto the binder layer using a sprayer or the like. Thereafter, the liquid containing the photocatalyst particles is dried at room temperature or by applying warm air of, for example, 100 ° C. or less to form a photocatalytic coating on the binder layer.

  When the application target is, for example, in a place where sunlight is irradiated, when the photocatalyst coating is irradiated with sunlight, the photocatalyst particles are excited to cause a catalytic reaction, thereby obtaining a rust / corrosion prevention effect. it can. In addition, since the binder layer has high adhesion to both the photocatalyst coating and the application target, the antirust / corrosion effect can be obtained over a long period of time.

  Next, the binder liquid for a photocatalyst coating agent of this embodiment will be described. The binder liquid for a photocatalyst coating agent of this embodiment is an inorganic polymer liquid having waterproofness, and contains amorphous silica and silicone. And this inorganic polymer liquid further contains the liquid containing the photocatalyst particle | grains from which photocatalytic activity is acquired by visible light. Here, first, a liquid containing photocatalyst particles will be described.

  The photocatalyst particles are of a so-called visible light responsive type, but the photocatalyst particles are not limited to this, and may be responsive to light other than visible light.

  FIG. 1 is a schematic explanatory view of a process for producing a liquid containing photocatalyst particles according to the present embodiment.

  This liquid contains a combination of two types of photocatalytic particles. First, a photocatalyst stock solution that is one of the two types of photocatalyst particles is produced (step S1).

  In order to produce the photocatalyst stock solution, first, a dispersion of ultrafine particles such as titanium hydroxide or titanium oxide, or titanium hydroxide gel is prepared (step S11). Subsequently, a precipitate generating agent such as sodium hydroxide is added to the dispersion liquid or the like (step S12). Thereby, a precipitate of titanium hydroxide is generated in the dispersion or the like.

  Specifically, 10 ml of an aqueous solution of about 50% to 70% by weight of titanium tetrachloride diluted with 1000 ml of distilled water was prepared as the dispersion. Further, about 10 ml of 2.0% by weight to 2.5% by weight of aqueous ammonia was added dropwise to the dispersion to produce a titanium hydroxide precipitate.

  Next, the precipitate is extracted from the dispersion by centrifugation, filtration or the like, and then the titanium hydroxide gel itself is washed with pure water, ion-exchanged water, distilled water or the like to remove impurities. (Step S13). Pure water, ion-exchanged water, or distilled water is added to the titanium hydroxide gel to produce a titanium hydroxide suspension of 100 ml to 500 ml (step S14).

  Next, 10 wt% to 20 ml of 30 wt% hydrogen peroxide water is added to the titanium hydroxide suspension and stirred (step S15), and then heated at a temperature of 65 ° C to 400 ° C, for example, for 2 hours to 15 hours ( Step S16). In this way, a stock solution of photocatalyst containing 5-30 nm anatase crystal titanium oxide is obtained. In this photocatalyst stock solution, incompletely crystallized titanium oxide of 5 nm or less remains.

  This photocatalyst stock solution had an average size in the longitudinal direction of titanium oxide of about 10 nm. A peroxo group is modified on the surface of titanium oxide. For this reason, in the stock solution of photocatalyst, the electric repulsion between the particles works due to the polarization of the peroxo group, and the titanium oxides repel each other so that they do not aggregate. Note that ammonium ions and the like in the photocatalyst stock solution also contribute to the dispersion. For this reason, the photocatalyst stock solution is a liquid in which titanium oxide is uniformly dispersed. In addition, the titanium oxide thus produced has one or more OH groups.

  FIG. 2 is a drawing-substituting photograph obtained by photographing the photocatalyst stock solution produced in step S1 of FIG. 1 through a transmission electron microscope. As shown in FIG. 2, the titanium oxide crystal particles contained in the photocatalyst stock solution have a substantially bowl shape (hereinafter referred to as “bathroom titanium oxide”). The substantially saddle shape means that the titanium oxide crystal is changed from amorphous to anatase crystal by the heating in step S16. In addition, it is necessary to reduce impurities other than ammonium ions as much as possible in order for titanium oxide to be substantially bowl-shaped.

  However, the shape of the vertical titanium oxide contained in the photocatalyst stock solution is controllable, and in addition to the substantially vertical shape, for example, by adding boron or the like to the photocatalyst stock solution between steps S14 and S15, the longitudinal direction It is also possible to make various cross-sections along the shape of various flat geometric shapes such as a substantially quadrangular shape, a substantially pentagonal shape, and a substantially octagonal shape. In the present embodiment, the titanium oxide crystal particles in the photocatalyst stock solution may be flat.

That is, the “flat shape” in this specification is defined as a general term for a shape that is relatively wide in the surface direction and relatively thin in the thickness direction. The surface includes not only a smooth surface but also a slightly uneven or curved surface. The shape of the surface is not limited, and may be any shape such as a circle, an ellipse, a hexagon, or a polygon such as a quadrangle. The size of the photocatalyst particles of flat shape, the plate surface direction, roughly fits ^{3nm 2 ~40nm} 2 in the range of about, on average a 10 nm ² to 20 nm ² nm. The thickness of the flat photocatalyst particles is approximately in the range of about 0.3 nm to 5 nm, and the average is about 1 nm to 3 nm.

Chemical formula 1 is a chemical structural formula of the cage titanium oxide shown in FIG. As shown in Chemical Formula 1, in the vertical titanium oxide shown in FIG. 2, a pair of titanium (Ti) is bonded through five oxygens (O), and each titanium is bonded to two OH groups. .

  Next, a photocatalyst base is manufactured (step S2).

  First, a sulfate is produced by reacting ilmenite ore whose main components are iron oxide and titanium oxide with sulfuric acid (step S21). Next, impurities are removed from the sulfate (step S22). Thereafter, the sulfate is hydrolyzed (step S23) to precipitate insoluble white hydrous titanium oxide. At this time, one or more OH groups are formed.

  Then, this is neutralized and washed, dried or fired, and fine particles are formed until it becomes an almost spherical shape with an average size of about 6 nm and little variation in size, thereby obtaining a photocatalyst base. The titanium oxide produced in this way will have one or more OH groups.

  The above production method is a so-called sulfuric acid method, but is not limited to this, and other methods such as a chlorine method, a hydrofluoric acid method, a titanium chloride potassium method, a titanium tetrachloride aqueous solution method, an alkoxide hydrolysis method, etc. A manufacturing method may be used.

  In addition, in order to obtain a band gap that can absorb visible light so that a photocatalytic action can be obtained by irradiation with visible light, introduction of various dopants to titanium oxide, high-temperature reduction of titanium oxide, high X-rays to titanium oxide, etc. Perform energy irradiation.

  FIG. 3 is a drawing-substituting photograph obtained by photographing the photocatalyst base produced in step S2 of FIG. 1 through a transmission electron microscope. As shown in FIG. 3, the titanium oxide crystal particles contained in the photocatalyst base have a spherical shape that is a three-dimensional shape (hereinafter referred to as “spherical titanium oxide”).

  However, the shape of the spherical titanium oxide crystal particles can be controlled, and in addition to the spherical shape, for example, various three-dimensional shapes such as a substantially elliptical shape, a circular shape, a square shape, and a polygonal shape of these cross sections. Is possible. In the present embodiment, the titanium oxide crystal particles of the photocatalyst base may have a three-dimensional shape.

  That is, the “three-dimensional shape” in this specification is defined as a generic name of a shape having a small relative difference between the surface direction and the thickness direction, unlike the “flat shape”.

  Here, in this embodiment, the average size of the crystal particles of the cage-type titanium oxide is set to be equal to or larger than the average size of the crystal particles of the spherical titanium oxide. If it carries out like this, spherical titanium oxide will enter into the clearance gap between vertical titanium oxides, and also both titanium oxides will be mixed mutually so that it may mention later. For this reason, when the photocatalyst-containing liquid is applied and dried on the substrate, the porosity of the photocatalyst is reduced.

  Next, a photocatalyst containing liquid is manufactured (step S3).

  First, the photocatalyst stock solution produced in step S2 is mixed with the photocatalyst stock solution produced in step S1 (step S31), and if necessary, this photocatalyst stock solution is stirred, so that the titanium oxide and the spherical oxidation are mixed. Titanium is bonded (step S32). At this time, the treatment of heating the photocatalyst stock solution is unnecessary, and the stirring conditions such as the stirring speed and the stirring time are not particularly limited.

  Here, as described above, since the titanium oxide in the photocatalyst stock solution is modified with a peroxo group, it is dispersed in the photocatalyst stock solution, so that the photocatalyst stock is maintained with respect to the photocatalyst stock solution while maintaining this state. May be added.

  For this purpose, it is preferable to avoid a decrease in peroxo groups or a decrease in impurities such as ammonium ion concentration contributing to the dispersion in the photocatalyst stock solution. Specifically, the concentration of peroxotitanic acid is not set to 5 w% or less, or impurities such as ammonium ions are set to 100 ppm or less, for example.

  Further, as described above, both of the titanium oxide in the photocatalyst stock solution and the titanium oxide of the photocatalyst base have one or more OH groups. For this reason, both titanium oxides are hydrogen-bonded at the OH group portion of each other. That is, the OH group becomes a substituent. However, it should be noted that the substituent is not limited to the OH group.

  By the way, general spherical titanium oxide is manufactured in a non-aqueous system, and vertical titanium oxide is manufactured in an aqueous system. Thus, they do not combine theoretically. Therefore, the present inventor has selected, for example, spherical titanium oxide containing an OH group in order to bond them. As a result, as described above, the spherical titanium oxide and the cage titanium oxide can be bonded to each other through the OH group.

  FIG. 4 is a drawing-substituting photograph obtained by photographing the photocatalyst-containing liquid produced in step S3 of FIG. 1 through a transmission electron microscope. Most of the spherical titanium oxide is combined with saddle type titanium oxide in the photocatalyst stock solution. In addition, even when the required vibration or the like was added to the photocatalyst stock solution, separation of spherical titanium oxide and saddle type titanium oxide was not confirmed.

  FIG. 5 shows the recombination rate of electrons and holes on the surface of the photocatalyst film by spherical photocatalyst particles and the recombination rate of electrons and holes on the surface of the photocatalyst film coated and dried with the photocatalyst-containing liquid of this embodiment. The measurement results are shown. This measurement employs a diffuse reflection spectrum (PP-DRS) method of femtosecond laser pulses. In FIG. 5, the vertical axis represents Δ optical density, and the horizontal axis represents time (picosecond).

  As shown in FIG. 5, on the spherical photocatalyst side, most of the recombination of electrons and holes is completed when 20 picoseconds have elapsed (b). On the other hand, on the photocatalyst side according to the present embodiment, recombination of more than half of electrons and holes is not completed even when 20 picoseconds have elapsed (a). This means that the recombination rate of electrons and holes is slow on the photocatalyst side according to the present embodiment.

  The electron concentration was calculated using the measurement results shown in FIG. 5 and the following mathematical formula (1).

  Electron concentration = electron concentration at time zero / 1 + electron concentration at time zero × secondary rate constant of electron-hole recombination × time + baseline (1)

The electron concentration on the spherical photocatalyst side was about 10 × 10 ¹² cm ³ / s, and the electron concentration on the photocatalyst side of this embodiment was about 1 × 10 ¹² cm ³ / s. Thus, a difference in electron concentration of about 10 times was confirmed. This means that the photocatalytic property according to the embodiment is 10 times better than the photocatalytic property when only spherical photocatalytic particles are used.

  That is, the slow “recombination rate” between electrons and holes is synonymous with excellent photocatalytic properties. Parameters for determining the “recombination rate” are as follows: “B. Ohtani, S.-W. Zhang, S.-i.Nishimoto and T. Kagiya, J. Photochem. Photobiol., A: Chem., 64, 223 ( 1992), “B. Ohtani and S.-i.Nishimoto, J. Phys. Chem., 97, 920 (1993)”, the crystallinity of the photocatalyst particles and the diameter of the photocatalyst particles (Surface area).

  In order to achieve high crystallization of an amorphous photocatalyst, it is necessary to reduce the impurities that are an impediment to near zero and to secure sufficient time for crystallization. For this reason, in the case of the present invention, as described above, in order to remove impurities, it is washed with pure water, ion-exchanged water, distilled water, etc., for example, for 2 hours to 15 hours, at a temperature of 65 ° C. to 400 ° C. It is heated with. That is, when “flat” photocatalyst particles are used, high crystallization of the photocatalyst contributing to the “recombination rate” can be realized.

  Here, the smaller the diameter of the photocatalyst particle, the larger the surface area of the photocatalyst particle. As a result, the number of molecules that can be adsorbed on the surface of the photocatalyst particle increases and the catalytic activity increases. On the other hand, as described in “J. Phys. Chem., 99, 16655 (1995)”, when the particle size of the photocatalyst particles is 2 nm or less, pair recombination of electrons and holes is likely to occur. Therefore, it is said that the catalytic activity is lowered.

  In the present embodiment, the size of the “flat” photocatalyst particles varies from 5 nm to 30 nm. However, some of the photocatalyst particles have incomplete crystallization of 5 nm or less. As a result, the photocatalytic particles having a size of 2 nm or less may cause the above-described recombination, which may reduce the catalytic activity.

  This disadvantage can be eliminated by using “three-dimensional” photocatalyst particles. That is, the “three-dimensional shape” photocatalyst particles have an average diameter of 6 nm, and the variation in the diameter is small. For this reason, the number of photocatalyst particles in which “three-dimensional” photocatalyst particles and “flat” photocatalyst particles are combined is relatively less than 2 nm. That is, by using photocatalyst particles having a diameter of 6 nm together with photocatalyst particles having a size of 5 nm to 30 nm, the proportion of photocatalyst particles having a size of 2 nm or less, which is the cause of recombination, is reduced. , Has reduced the disadvantages.

(Comparative example)
1. After only applying the photocatalyst stock solution to the substrate and drying it, the surface of the substrate was observed using an electron microscope. As a result, the titanium oxide adhering to the surface was confirmed to have an average porosity of about 60%.

  2. After the spherical titanium oxide was mixed with distilled water, applied to the substrate and dried, the surface of the substrate was observed using an electron microscope. As a result, the average amount of titanium oxide adhering to the surface was about 70%. The porosity was confirmed.

  3. After the photocatalyst-containing liquid according to the present embodiment was applied to a substrate and dried, the surface of the substrate was observed using an electron microscope. As a result, the titanium oxide adhered to the surface had an average porosity of about 30%. Was confirmed. The part where the porosity exceeds 50% was not confirmed.

  It was also confirmed that the photocatalytic crystal was highly oriented in the photocatalyst film obtained by applying the photocatalyst-containing liquid according to this embodiment to a substrate and drying it. Furthermore, it was confirmed that the strength of the photocatalytic film was excellent.

  Even if the mixing ratio of the two types of titanium oxide in the photocatalyst-containing liquid according to the present embodiment is variously changed, such as about 3: 7, about 5: 5, and about 7: 3, the porosity is greatly different. There was no.

  By the way, as the content of spherical titanium oxide in the photocatalyst-containing liquid increases, the titanium oxide in a state where the cage-like titanium oxide and the spherical titanium oxide are combined becomes heavier, and this precipitates in the photocatalyst-containing liquid. Became. After all, it has been found that the ratio of cage-like titanium oxide to spherical titanium oxide is preferably about 3: 7 to about 7: 3, and most preferably about 5: 5.

In this embodiment, the titanium oxide-containing liquid is mainly described as an example of the photocatalyst-containing body. However, the liquid is not limited to a liquid and may be in a gel form or a sol form. Photocatalytic active materials include not only titanium oxide (TiO ₂ ) but also Fe ₂ O ₃ , Cu ₂ O, In ₂ O ₃ , WO ₃ , Fe ₂ TiO ₃ , PbO, V ₂ O ₅ , FeTiO ₃ , Bi. ₂ O ₃ , Nb ₂ O ₃ , SrTiO ₃ , ZnO, BaTiO ₃ , CaTiO ₃ , KTaO ₃ , SnO ₂ , ZrO ₂ , Si, GaAs, CdSe, GaP, CdS, ZnS, or the like may be used.

Next, the inorganic polymer liquid formed by the binder liquid for the photocatalyst coating agent will be described. The inorganic polymer liquid is mainly composed of an inorganic resin such as amorphous silica and silicone, and water is used as a dispersion medium. Such an inorganic polymer liquid is densified by low temperature heating or light irradiation to increase the film hardness and form an amorphous inorganic polymer film. And the film | membrane formed in this way is a perfect inorganic film | membrane, Comprising: Although it is a thin film, it is excellent in hardness, adhesiveness, acid resistance, alkali resistance, volatile oil resistance, detergent resistance difference, and weather resistance. In particular, as a film that prevents the penetration and contact of moisture to the surface of the application target, the effect of preventing the application target from being rusted or attacked is achieved.
The same applies to the case where a binder solution for a photocatalyst coating agent obtained by mixing a liquid containing photocatalyst particles with an inorganic polymer solution is used. In this case, an inorganic film composed of amorphous titanium oxide and an amorphous inorganic polymer is formed. In combination with the photocatalytic effect, the antirust and anticorrosive effects are further exhibited.

  Specifically, this inorganic polymer liquid contains about 0.5% to about 2% of amorphous silica, about 0.5% to about 5% of silicone, and the rest is water. For this reason, a complete inorganic film can be formed alone or with a liquid containing photocatalyst particles. The inorganic polymer liquid may contain about 0.01% to 0.05% of an inorganic surfactant as necessary. Such an inorganic polymer liquid becomes a 100% inorganic 100% aqueous one-component binder liquid for a photocatalyst coating agent or a precursor thereof.

  The inorganic polymer liquid under such conditions is milky white, the solid content% in the state heated at 120 ° C. for 60 minutes is 3.0 to 3.5, the pH is 10 to 12, and the liquid temperature is 25 ° C. The specific gravity at is about 1.0.

  Subsequently, the inorganic polymer liquid is added at a ratio of about 1: 1 to the liquid containing the photocatalyst particles described above and mixed. Specifically, this mixing may be performed at room temperature with stirring at, for example, about 100 rpm to 700 rpm. However, it may be performed under heating, and stirring at the time of charging can be omitted. The stirring time depends on the input speed of the inorganic polymer liquid, the size of the stirring blade, etc., but at room temperature, for example, when the total amount of the liquid containing the photocatalyst particles and the inorganic polymer liquid is about 40 kL If so, it may be about 30 minutes.

  Moreover, metals such as Ag, Cu, and Zn can be added to the binder liquid for the photocatalyst coating agent. The surface layer to which such a metal is added can kill bacteria, sputum and algae attached to the surface even in the dark, and thus can further improve antibacterial properties. The addition amount may be about 1% to 5% with respect to the total amount of the liquid containing the photocatalyst particles and the inorganic polymer liquid.

  Furthermore, platinum group metals such as Pt, Pd, Ru, Rh, Ir, and Os can be added to the binder solution for the photocatalyst coating agent. The surface layer to which such a metal is added can enhance the redox activity of the photocatalyst, and can improve the degradability of organic contaminants and the decomposability of harmful gases and odors. The amount added may be about 1 wt% to 5 wt%.

  Since the binder liquid for a photocatalyst coating agent is inorganic, it can obtain an antirust / preservative effect of metal without causing interference with the paint.

  Furthermore, when a photocatalyst coating agent binder liquid produced by mixing a liquid containing photocatalyst particles with an inorganic polymer liquid was applied to an application target, the photocatalyst coating agent binder liquid was applied to the application target side. An inclined structure in which the amount of the inorganic polymer liquid was relatively large and the liquid containing the photocatalyst particles on the surface side was relatively large was confirmed. For this reason, when a metal to which the required paint has been applied is selected as an application target and a binder layer is formed by applying a binder liquid for the photocatalyst coating agent, the binder liquid for the photocatalyst coating agent is inorganic. Therefore, it is possible to obtain anti-corrosion and anti-corrosion effects of metals without causing interference with the paint, and it has high affinity and high adhesion because it contains the same photo-catalyst particles with the photo-catalyst coating. Sex can be obtained.

  Below, the construction example of the photocatalyst coating using the binder liquid for photocatalyst coating agents of this embodiment is demonstrated. Here, an inorganic polymer liquid having a waterproof property as a binder liquid for the photocatalyst coating agent of the present embodiment, which is a mixture of amorphous silica and silicone and a liquid containing photocatalyst particles, is applied as an air-conditioning target. An example in which each outdoor unit is selected will be described.

  Air conditioners such as air conditioners account for about 45% to 50% of power consumption in general office buildings, wholesale / retail stores and restaurants (estimated by the Agency for Natural Resources and Energy). And much of the power consumption of an air conditioner is influenced by the installation environment of the outdoor unit.

  However, although outdoor units have installation standards such as installation in the shade, they are often installed on the rooftops of buildings, and it is difficult to comply with the installation standards. It is. Then, it is realistic to take some power saving measures for air conditioners that do not satisfy the installation standards.

  It is known that an air conditioner efficiently saves power when cooled by using heat of vaporization caused by watering or the like. However, many of the outdoor units are made of metals such as iron, aluminum, and copper, so that there is a problem that they are easily corroded by watering.

  Therefore, in the present embodiment, a liquid containing a photocatalyst particle capable of forming a binder layer by applying a binder liquid for a photocatalyst coating agent to the inside and outside of the outdoor unit and then obtaining photocatalytic activity for the binder layer. The photocatalyst coating is formed by applying, and rust prevention / preservation of the outdoor unit by watering is realized.

  In addition, it is good for an outdoor unit to avoid direct sunlight by covering the periphery with a light-shielding net made of polypropylene or the like. And it is good to water the mist in the space covered with the light-shielding net. If it carries out like this, since the surroundings of an outdoor unit will become high humidity with a small amount of sprinkling, the power-saving effect by heat of vaporization can be heightened.

  As described above, in the present embodiment, the case where the air-conditioning outdoor unit is selected as the application target of the binder liquid for the photocatalyst coating agent has been described as an example. However, the application target is not limited to the air-conditioning outdoor unit, for example, a bicycle placed outdoors. It can be used for vehicles that want to be rusted and preserved, such as motorcycles. More specifically, it is not particularly limited as long as the photocatalytic coating can be formed. Examples of the material to be applied include various materials such as wood, organic materials including paper, inorganic materials including metal, and mixtures or compounds thereof.

  Examples of organic materials include vinyl chloride resin, polyethylene, polypropylene, polycarbonate, acrylic resin, polyacetal, fluorine resin, silicone resin, ethylene-vinyl acetate copolymer (EVA), acrylonitrile-butadiene rubber (NBR), polyethylene terephthalate ( PET), ethylene-vinyl alcohol copolymer (EVOH), polyimide resin, polyphenylene sulfide (PPS), acrylonitrile-butadiene-styrene (ABS) resin, synthetic resin material such as melamine resin, natural, synthetic or semi-synthetic fiber material In particular, polyethylene terephthalate having a good balance in terms of transparency, strength, and price is generally preferable.

  When the application target is made of an organic material, it is preferable to subject the application target to surface activation treatment in advance. By this treatment, the wettability and coating property to the application target are improved. As the surface activation treatment, for example, corona treatment, normal pressure (or atmospheric pressure) plasma treatment, low-pressure low-temperature plasma treatment, easy adhesion treatment, or the like can be used.

  Examples of inorganic materials include glass and ceramic materials. These can be commercialized in various forms such as tiles, insulators, mirrors and the like. Moreover, a metal is mentioned as an inorganic material. This includes cast iron, steel, iron, iron alloy, aluminum, aluminum alloy, nickel, nickel alloy, zinc die cast, etc., which may be plated and coated with organic paint. Further, it may be a metal plating coating applied to the surface of an inorganic or organic material.

It is outline | summary explanatory drawing of the manufacturing process of the liquid containing the photocatalyst particle | grains from which photocatalytic activity is obtained by the visible light which concerns on this embodiment. FIG. 3 is a drawing-substituting photograph obtained by photographing the photocatalyst stock solution produced in step S1 of FIG. 1 through a transmission electron microscope. FIG. 2 is a drawing-substituting photograph obtained by photographing the photocatalyst base produced in step S2 of FIG. 1 through a transmission electron microscope. It is a drawing substitute photograph which image | photographed the photocatalyst containing liquid manufactured in step S3 of FIG. 1 through the transmission electron microscope. The measurement results of the recombination rate of electrons and holes on the surface of the photocatalyst film by the spherical photocatalyst particles and the recombination rate of electrons and holes on the surface of the photocatalyst film coated and dried with the photocatalyst-containing liquid of this embodiment are shown. Is.

Claims (6)

A binder liquid for a photocatalyst coating agent containing an inorganic polymer liquid having waterproof properties,
The inorganic polymer liquid contains amorphous silica and silicone,
Binder liquid for photocatalyst coating agent.   The binder liquid for photocatalyst coating agents of Claim 1 which further contains the liquid containing a photocatalyst particle.   The binder solution for a photocatalyst coating agent according to claim 2, wherein the photocatalyst particles are a combination of flat crystal particles and solid crystal particles having a thickness with respect to the flat crystal particles.   The binder solution for a photocatalyst coating agent according to claim 2 or 3, wherein the photocatalyst particles have photocatalytic activity obtained by visible light.   An air conditioning outdoor unit in which a photocatalyst coating formed by a liquid containing the photocatalyst particles is applied on a binder layer formed by the binder liquid for a photocatalyst coating agent according to any one of claims 1 to 4.   The construction method of a photocatalyst coating which forms a binder layer with the binder liquid for photocatalyst coating agents of any one of Claims 1-4, and forms a photocatalyst coating with the liquid containing the said photocatalyst particle on the said binder layer.