JP2002138376A - Interior material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an interior material having not only excellent moisture- absorbing and releasing functions, but also excellent functions for decomposing noxious gases and malodors by using a photocatalyst, and capable of being industrially produced at a comparatively low cost. SOLUTION: This interior material is an interior wall material obtained by fixing a porous body carrying photocatalyst particles on the surface of an interior substrate. The interior wall material having the moisture-absorbing and releasing functions and the photocatalytic functions is characterized in that the pore size distribution of the porous body carrying the photocatalyst particles is 2-10 nm radius, the average particle diameter of the photocatalyst particles is <=30 nm, and the pore size distribution of the porous bodies before carrying the photocatalyst is 20-30 nm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interior wall material having an excellent autonomous humidity control function capable of preventing dew condensation and properly adjusting the indoor humidity to secure a comfortable space, and a method of manufacturing the same. Further, the present invention relates to a humidity control / photocatalyst interior wall material having a photocatalytic function capable of decomposing harmful gas phase substances, unpleasant odors and dirt when exposed to light, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, the living environment has been increasing comfort with the improvement of heat insulation and the enhancement of heating equipment. Internal dew condensation occurs, and rot fungi and the like multiply and deteriorate the strength of the wall material. As a result, it may not be possible to maintain sufficient strength against the earthquake. In addition, allergic problems associated with the propagation of mites and molds have also occurred. Furthermore, energy consumption will increase in the future, and it is necessary to reduce the load on the air conditioning equipment not only in terms of cost but also global environmental problems.

The above-mentioned artificial environmental control using a heat insulating material, a heater, or the like is intended to perform temperature control in order to comfortably cope with high-temperature, high-humidity, or low-temperature, low-humidity environmental conditions in Japan. A comfortable environment can be realized by itself. For this reason, the interior materials themselves have a humidity control function, adjust the humidity of the room without the need for air conditioning equipment or electric power, etc. Development is taking place. As the conventional humidity control building materials, calcium silicate building materials (JP-A-5-29367), diatomaceous earth-based building materials (JP-A-4-354514), and zeolite-based building materials (JP-A-3-93632) have been developed.

In recent years, indoor environmental pollution due to odor and harmful chemical substances has become a problem as sick house syndrome. Therefore, various proposals have conventionally been made for adding a photocatalyst to interior materials for the purpose of purifying indoor air. For example, WO 94/11092 states that 300 to 400 n
There has been proposed a method of treating indoor air in which an interior material having a photocatalytic layer formed on the surface thereof is disposed so as to face general lighting that can irradiate light having a wavelength of m. It is known that, when light is irradiated on titanium oxide, the contacted molecular species is decomposed by a strong redox effect. By utilizing this photocatalytic action, it is possible to easily decompose and remove odors, harmful chemical substances and dirt in the air, and to antibacterial bacteria floating indoors.
And it can be used semi-permanently.

[0005]

The hygroscopic action is achieved by the adsorption of water vapor to the pores of the microporous material. Liquefaction by gas condensation in the pores and gasification of the liquid occur depending on the pore diameter, and the pore radius at which such a state change occurs is called the Kelvin radius based on Kelvin's capillary aggregation theory. Is determined by the following Kelvin equation. InP / P0 = -2γV1 / rmRT As is clear from the Kelvin equation, the position of humidity at which the amount of adsorption increases depends on the size of the pore diameter. By the way, the range of relative humidity that is considered comfortable in the living environment is about 50 to
Since it is said to be 70%, the Kelvin radius of the pores is about 2 to 6
If m, humidity control can be performed autonomously within the range of the relative humidity that is most ideally comfortable.

As described above, various types of humidity control building materials have already been developed, but they have the following problems. Conventional zeolites are excellent in hygroscopicity but inferior in moisture release, and thus are not always suitable for use as a humidity control building material. Further, the conventional diatomaceous earth-based humidity control building materials have a problem in the stability of the humidity control performance because the humidity control ability depends on the physical properties inherent in diatomaceous earth. Furthermore, conventional calcium silicate moisture-control building materials have a dew-proof property for a short period of time, but when the high-humidity condition continues for a long time, such as during the rainy season, the amount of moisture absorbed by the building material is saturated, and the dew-proof property is lost. Would. Furthermore, none of the conventional humidity control building materials can be controlled autonomously to 50-70% of the comfortable humidity range.

On the other hand, simply forming a photocatalyst layer on the surface of an interior material has not been sufficient to decompose toxic gases and odors by the photocatalyst. Therefore, Japanese Patent Application Laid-Open No. 8-99041
Then, in order to enhance the photocatalytic activity, a pore diameter of 1 nm to 2 μm
A method of forming a porous photocatalytic thin film is proposed. However, in this proposed method, it is necessary to repeat coating and firing of the photocatalyst many times in order for the interior material to carry a sufficient amount of the photocatalyst to decompose indoor polluted air, and cost and productivity are taken into consideration. Then, industrial feasibility is low. Further, in order to increase the activity of decomposing harmful gases and odors by the photocatalyst, a method of fixing the photocatalyst and an adsorbent such as zeolite or activated carbon to the surface of a substrate has been proposed. In this method, harmful gases and odors are trapped by an adsorbent, and decomposed by a photocatalyst. However, ordinary zeolites have a very fine pore size and are not suitable for trapping harmful chemical substances having a large molecular weight.In addition, activated carbon is suitable for the pore size, but the color is black, and the interior material is black. Is not preferred.

Further, there has been proposed a building material having both the activity of decomposing harmful gas and odor by a photocatalyst and the property of controlling humidity. For example, Japanese Patent Application Laid-Open No. Hei 7-113272 proposes forming a mixed layer composed of a moisture absorbent and photocatalyst fine powder on the surface of an interior material. However, in this proposed method, since a photocatalyst fine powder is used, it is not a light source such as a mercury lamp which emits a few tens of W of intense ultraviolet light which is not normally used in a room, but is used in ordinary room lighting or ultraviolet light in sunlight. Illuminance (0.001 to 10 mW / cm
In the case of irradiation of 2), the photocatalyst does not have sufficient activity for decomposing harmful gases and odors. Furthermore, since the humidity control function is about to be realized by the decomposition of dew condensation water by a photocatalyst, nothing is mentioned about the structure of the hygroscopic agent, and its hygroscopic characteristics are not clear.

Therefore, in the present invention, when it is generally used indoors, it is excellent in the function of absorbing and releasing moisture and also excellent in the function of decomposing harmful gases and odors by a photocatalyst, and at a relatively low cost industrially. It is an object to provide an interior material that can be manufactured.

[0010]

According to the present invention, in order to solve the above-mentioned problems, there is provided an interior wall material in which a porous body carrying photocatalyst particles is fixed on the surface of an interior base material, wherein the photocatalyst particles are The pore size distribution of the supported porous body has a radius of 2 to 10 nm.
And the average particle size of the photocatalyst particles is 30 nm or less,
The pore size distribution of the porous substrate before supporting the photocatalyst has a radius of 2
An interior wall material having a water vapor absorption / desorption function and a photocatalytic function, which is characterized by having a thickness of 0 to 30 nm. Radius 20
By using a porous body having a pore size distribution of ~ 30 nm, and fixing photocatalyst particles having an average particle size of 30 nm or less,
In the state where the photocatalyst particles are supported, a porous body having a pore size distribution with a radius of 2 to 10 nm can be produced relatively easily.
By fixing this porous body to the surface of the interior base material, a radius of 2
It has a pore size distribution of 10 to 10 nm,
It is possible to autonomously control the moisture balance in a comfortable humidity range of 50 to 70%. In addition, almost all of the harmful gases and odors in the house can be adsorbed. Further, by fixing the photocatalyst particles in the pores having high surface free energy in the porous body and easily adsorbing the harmful gas and the odorous gas, the decomposition performance of the harmful gas and the odorous gas by the photocatalyst is improved.

In one embodiment of the present invention, an inorganic coating is formed on the surface of an interior base material made of an organic base material such as paper or a synthetic resin sheet, and photocatalyst particles are supported on the surface of the coating. Interior wall material with a fixed porous body,
The pore size distribution of the porous body supporting the photocatalyst particles is 2 to 10 nm in radius, and the average particle size of the photocatalyst particles is 30 nm.
The present invention provides an interior wall material having a function of absorbing and releasing water vapor and a function of photocatalyst, wherein the pore size distribution of the porous substrate before supporting the photocatalyst is 20 to 30 nm in radius. In the case of an interior made of an organic base material such as paper and a synthetic resin sheet, a photocatalyst of the base material is formed by forming an inorganic coating such as silica, alkali silicate, alkali borate, alumina, borosilicate, and zirconia on the surface. Can be effectively prevented.

In one embodiment of the present invention, a coating containing a porous γ-alumina is formed on the surface of the interior base material, and the porous material carrying photocatalyst particles is fixed on the surface of the coating. The interior wall material, wherein the pore size distribution of the porous body carrying the photocatalyst particles is a radius of 2 to 10 nm, the average particle size of the photocatalyst particles is 30 nm or less, and the porous substrate before carrying the photocatalyst is provided. The pore size distribution of
Provided is an interior wall material having a water vapor absorption / desorption function and a photocatalytic function characterized by having a thickness of 30 nm. As described later, the γ-alumina porous body has relatively easy control of pores in the process and has high gas adsorption performance. Therefore,
By forming a coating containing a γ-alumina porous body on the inside of the porous body carrying the photocatalyst particles, it becomes difficult for the harmful gas and odor gas once captured to escape to the outside of the interior, and to absorb moisture. The required volume also increases.

In a preferred embodiment of the present invention, the γ
-The alumina porous body has a radius of 2 to 6 n in the pore diameter distribution.
m pores should have at least 70% of the total pore volume. By doing so, it is possible to autonomously control the moisture absorption / desorption equilibrium of water vapor to 50 to 70% of the comfortable humidity range, and to enhance the gas adsorption performance. The above γ
-The alumina porous body is, for example, a kaolin mineral and / or alumina-silica based coprecipitated gel of 900 to 1200.
It can be obtained by treating with alkali or hydrofluoric acid at a temperature of 1 ° C for 1 minute to 100 hours.

In a preferred embodiment of the present invention, the γ
-The coating film containing the alumina porous material contains a coating film forming binder in addition to the γ-alumina porous material, and contains 10 to 600 parts by weight of the γ-alumina porous material with respect to 100 parts by weight of the coating film forming binder. To do it. By using a film-forming binder such as an alkali metal silicate or colloidal silica, it can be firmly fixed to the interior substrate. Further, by using 10 to 600 parts by weight of the γ-alumina porous body with respect to 100 parts by weight of the coating film forming binder, a harmful gas in the γ-alumina porous body, a function of trapping an odorous gas,
It can firmly adhere to the interior base material while leaving the function of increasing the volume capable of absorbing water vapor.

In a preferred embodiment of the present invention, at least one metal selected from platinum, rhodium, ruthenium, palladium, gold, silver, copper, iron, nickel and zinc is fixed to the photocatalyst particles. To do. By doing so, the function of decomposing harmful gas and odorous gas by the photocatalyst is improved.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A concrete example of a preferred interior wall material of the present invention will be described below. In the first embodiment, a porous body carrying photocatalyst particles is fixed on the surface of the interior base material. The pore size distribution of the porous body on which the photocatalyst particles are supported has a radius of 2 to 10 nm, the average particle size of the photocatalyst particles is 30 nm or less, and the pore size distribution of the porous substrate before supporting the photocatalyst has a radius of 20 to 30 nm.

In the above embodiment, the interior base material includes, for example, metal plate, paper, synthetic resin sheet, gypsum board, particle board, ceramic panel, siding panel, calcium silicate plate concrete plate, woven fabric, non-woven fabric, glass fiber Sheets, metal fiber / glass fiber composite sheets, flame-retardant backing papers, inorganic interior base materials, and the like can be used.

As the photocatalyst particles, for example, particles of titanium oxide, zinc oxide, strontium titanate, tin oxide, vanadium oxide or tungsten oxide can be used. In particular, crystalline titania such as anatase, rutile, brookite and magneli phases is relatively inexpensive and has an average particle size of 30.
This is preferable in that fine particles having a diameter of not more than nm can be obtained. The crystal form of titanium oxide may be rutile or brookite, but is preferably anatase from the viewpoint of activity. The average particle diameter of the photocatalyst particles is preferably 30 nm or less.
By doing so, the decomposition activity of the harmful gas and the odorous gas by the photocatalyst is improved. The average crystallite diameter of the photocatalyst particles is 1 to
It is preferably 30 nm, more preferably 5 to 15 nm.

The photocatalyst particles may be present in a range of 10 μm or more, preferably 50 μm or more, more preferably 100 μm or more in the vertical direction from the surface in contact with the outside air. By doing so, a film excellent in moisture absorption / desorption property, adsorption and decomposability of bad smells and harmful chemical substances is obtained. The photocatalyst particles are 2,000 μm or less, preferably 1000 μm or less, more preferably 50 μm or less in the vertical direction from the surface in contact with the outside air.
It is preferable that it exists in a range of 0 μm or less. By doing so, a coating film having excellent design properties and good winding property among cloths among interior materials can be obtained.

Examples of the porous substrate supporting the photocatalyst include alumina-silica coprecipitated xerogel porous material, silica gel, γ-alumina porous material, mesoporous zeolite,
At least one selected from apatite, porous glass, diatomaceous earth, sepiolite, allophane, imogolite, and activated clay can be used.

Among the above substances, the alumina-silica coprecipitated xerogel porous material can be manufactured as follows. Aluminum nitrate nonahydrate and tetraethyl orthosilicate are dissolved in ethanol so as to have a predetermined SiO2 / Al2O3 ratio, and at this time, a predetermined amount of water is added as needed to prepare a solution. After stirring this solution for 3 hours, 25% aqueous ammonia is added instantaneously to cause co-precipitation and gelation, and is rapidly dried using a rotary evaporator. The dried gel is calcined at 300 ° C. for 4 hours to obtain an alumina-silica-based copolymer. A precipitated xerogel porous body can be obtained. The pore size distribution of the alumina-silica coprecipitated xerogel porous material can be controlled to a targeted pore size distribution with a radius of 20 to 30 nm by adjusting the SiO2 / Al2O3 ratio. In addition, any porous body having a pore diameter distribution with a radius of 20 to 30 nm can be used without limitation for the porous substrate used for the photocatalyst-supporting porous body of the present invention.

When an alumina-silica coprecipitated xerogel porous material is used, titanium oxide can be suitably used as a photocatalyst contained in the pores, and the crystal structure of the titanium oxide must be anatase having high photocatalytic activity. Is preferred. The weight of titanium oxide contained in the pores of the alumina-silica coprecipitated xerogel porous body is 0.01 to 80% by weight when the obtained photocatalyst-supporting porous body is dried at 200 ° C. Is good. When the content is 0.01% by weight or more, the photocatalytic activity becomes practically sufficient. On the other hand, if it exceeds 80% by weight, the photocatalytic activity is saturated, so that it is economically preferable to make it 80% by weight or less.

The above-mentioned comfortable humidity range of 50-70
% As a porous substrate having a pore size that can be controlled autonomously to a percentage of γ-alumina obtained by calcining a kaolin mineral and / or alumina-silica-based coprecipitated gel and then treating it with an alkali or hydrofluoric acid. The body can also be suitably used. Kaolin minerals have the general formula: nSiO2.Al2O3.
Although it is represented by mH2O, as such kaolin mineral, specifically, for example, kaolinite (2SiO2.A
l2O3 · 2H2O), dickite (2SiO2 · Al2O)
3.2H2O), Nacrite (2SiO2.Al2O3.2H2)
O), halloysite (2SiO2.Al2O3.4H2)
O), allophane (1-2SiO2.Al2O3.5H2)
O), imogolite (SiO2.Al2O3.nH2O), etc. When this kaolin mineral is heated, kaolin mineral → metakaolin → spinel phase (γ-alumina) +
The phase changes from amorphous silica to mullite + cristobalite. In order to separate the kaolin mineral into the spinel phase and the amorphous silica as described above, usually, 900 to 1200 is used.
C., preferably at a temperature of 950 to 1000 ° C. for 100 hours or less, preferably about 1 to 24 hours.

For example, when kaolinite from Georgia or halloysite from China is used as the kaolin mineral, it is kept at a temperature of about 950 to 1000 ° C. for about 1 to 24 hours and separated into a spinel phase and amorphous silica. It is preferable to prepare a heat-treated product. If the heat treatment temperature for phase separation of kaolin minerals such as halloysite produced in China is higher than 1200 ° C., γ-alumina and amorphous silica react to generate mullite, and γ-alumina disappears. On the other hand, the heat treatment temperature of kaolin mineral is 900
If the temperature is lower than 0 ° C., no phase separation occurs between the spinel phase and the amorphous silica.

The heat-treated product is treated with an alkali or hydrofluoric acid to produce a γ-alumina porous body. When treating with an alkali or hydrofluoric acid, when using a KOH solution having a concentration of about 1 to 5 mol / l as an alkali per 1 g of the heat-treated product, it is usually 200 ° C. or lower, preferably 25 to 20 ° C.
0 ° C., more preferably 50-90 ° C., usually 1
00 hours or less, preferably 1 minute to 100 hours, more preferably 5 minutes to 100 hours, particularly preferably 30 minutes to 5 hours.
It is desirable to hold for about an hour. When a heat-treated kaolin mineral is treated with alkali or hydrofluoric acid, alkali-soluble components such as amorphous silica are selectively dissolved and removed to make the material porous. The alkali may be any one that exhibits strong alkalinity, such as LiOH, NaOH, K
OH, MgOH2, CaOH2 and the like are exemplified.

The γ-alumina porous material thus obtained usually shows a sharp peak having a uniform pore diameter around 2 to 4 nm, a specific surface area as high as about 100 to 350 m ² / g, and The volume is as large as 0.5 to 0.9 ml / g, and a high specific surface area can be maintained even at a high temperature.

In the present invention, at least one metal selected from platinum, rhodium, ruthenium, palladium, gold, silver, copper, iron, nickel and zinc is fixed to the photocatalyst particles. Good. To that end, a solution of at least one compound selected from the above elements is prepared using a solvent that dissolves the compound. Since the porous body carrying the photocatalyst in which the titanium oxide according to the present invention is contained in the pores is not broken even when put in water, water can be used as the solvent. The solution of the compound is impregnated by a known method such as a dip coating method, a spray method, or a dropping method, and is then contained in a porous body supporting the photocatalyst particles. The compound is decomposed or oxidized to a metal or metal oxide. For this purpose, the above-described treatment is performed, for example, by gradually heating from room temperature to a final temperature of 200 to 700 ° C. for a certain period of time, and then cooling to room temperature. If the firing temperature is lower than 200 ° C., the compound is not decomposed or oxidized. If the firing temperature is higher than 700 ° C., the crystal structure of titanium oxide in the pores becomes rutile and the photocatalytic activity decreases, which is not desirable. In addition, by impregnating the solution of the compound into the photocatalyst-supporting porous body by a known method such as an impregnation method, a dip coating method, a spray method, or a dropping method, and then irradiating light, that is, a known method such as a photoelectrodeposition method. According to the method, the metal of the transition element can be coated on the titanium oxide by reducing the ions of the transition element.

An example of a specific method for immobilizing the titanium oxide particles on the surface of the porous substrate and in the pores will be described below.
First, an aqueous liquid containing ultrafine titanium oxide particles and an alkali metal silicate is prepared. The ratio of the titanium oxide ultrafine particles to the alkali metal silicate in the aqueous liquid is 1 to 70 parts by weight, preferably 1 to 30 parts by weight, per 100 parts by weight of the titanium oxide ultrafine particles. . Also,
The concentration of the titanium oxide particles in the aqueous liquid is 0.01 to 10% by weight, preferably 0.01 to 1% by weight. The medium constituting the aqueous liquid may be water alone, or may be a mixture of water and an organic solvent (eg, methanol or ethanol). The aqueous liquid can be easily prepared by adding a titanium oxide ultrafine particle dispersion to water glass under stirring. In the aqueous solution, when the amount of the alkali metal silicate added is too small, the titanium oxide ultrafine particles are easily peeled off from the surface of the porous substrate, and when the amount is too large, the titanium oxide layer on the surface of the porous substrate becomes durable and stable, but the catalytic activity is increased. Decrease.

Next, the aqueous liquid is coated on the surface of the porous substrate and in the pores and cured. As a coating method in this case, various methods such as a dipping method can be adopted. The coating temperature is normal temperature,
In some cases, heating at 30 to 60 ° C. can be employed. In order to cure the coating layer composed of the aqueous liquid formed on the surface of the porous substrate and in the pores, the coating layer is cured at 100 to 150 ° C., preferably 110 to 13 ° C.
After drying at 0 ° C for about 30 minutes to 3 hours, 400 to 500
A method of sintering at ℃ can be adopted. Further, as another method of curing the coating layer, a method of adding a water glass curing agent to an aqueous liquid can be employed.
According to this method, the coating layer containing the water glass curing agent can be cured by leaving it at room temperature, but can be preferably cured by heating to a temperature of 30 to 80 ° C. Moreover, after hardening, if necessary, sintering can be performed at 400 to 500C. Examples of the curing agent include inorganic acids such as phosphoric acid and boric acid and salts thereof, silicofluorides such as sodium silicofluoride, metal oxides such as zinc oxide and magnesium oxide, and metal salts such as calcium carbonate and calcium sulfate. . The addition amount of the curing agent is about 10 to 25% by weight of the alkali metal silicate.

In the present invention, the thickness of the photocatalyst layer formed on the surface of the porous substrate is not limited, but the thickness of the photocatalyst layer formed in the pores is preferably about 10 to 30 nm.

The following is another example of a specific method for immobilizing titanium oxide particles on the surface of the porous substrate and in the pores. The method is a method in which a titania sol prepared from an alkoxide of titanium and an alcohol amine or a glycol is contained in the surface and in the pores of the porous substrate, and then heated and calcined.

The titania sol is more specifically a tetraisopropyl titanate, a tetrabutyl titanate, a butyl titanate dimer, a tetrakis (2-ethylhexyloxy) titanium obtained by the reaction of titanium tetrachloride or metal titanium with an alcohol or the like. , Tetrastearyl titanate, triethanolamine titanate, diisopropoxy bis (acetylacetonato) titanium, dibutoxy bis (triethanolaminate) titanium, titanium ethyl acetoacetate, titanium isopropoxyoctylene glycolate, titanium lactate, etc. It is prepared by hydrolyzing an alkoxide of titanium. At that time, monoethanolamine,
Addition of alcoholamines such as diethanolamine, triethanolamine, N-methyldiethanolamine, N-ethyldiethanolamine, N, N-dimethyldiaminoethanol and diisopropanolamine, and glycols such as diethylene glycol to provide storage stability, uniform and transparent. A titania sol is obtained.

To make the titanium oxide thin film more porous,
Additives such as polyethylene glycol can be used. The titania sol thus obtained may be used after being diluted with a compatible liquid to an arbitrary concentration. The diluent of the titania sol is ethanol, 1-propanol, 2-propanol, N-hexane, benzene, toluene, xylene, trichlene, propylene dichloride, etc. Available. The titania sol obtained as described above is contained in a porous substrate made of an alumina-silica coprecipitated xerogel porous material or the like by a known method such as an impregnation method or a dip coating method. The titania sol that has entered the pores is rapidly hydrolyzed by moisture previously adsorbed in the pores and moisture in the air. Thereafter, the step of drying the solvent and heating and calcining is performed only once to obtain the desired photocatalyst-carrying porous body. Further, in the above coating method, when the titania sol is contained in a porous substrate made of an alumina-silica-based coprecipitated xerogel, the alumina-silica-based coprecipitated xerogel is immediately washed with a cleaning solution compatible with titanium alkoxide. After washing the titania sol adhering to the pores of the porous substrate made of, the porous body carrying the desired photocatalyst is obtained by heating and baking.

Here, as a cleaning solution for the titania sol attached to the surface of the porous material, ethanol, 1-propanol, 2-propanol, N-hexane, benzene,
Any substance that is compatible with the titania sol, such as toluene, xylene, trichlene, and propylene dichloride, can be used without limitation. Alumina containing titania sol
Washing a porous substrate made of silica-based co-precipitated xerogel, etc., reliably solves problems such as the porous materials sticking to each other when not washed, the attached titania sol dripping, and an uneven film. Is done. In addition, by adding a washing operation, the thickness of the titanium oxide thin film photocatalyst fixed to the surface of the porous substrate can be made extremely thin. It is possible to obtain a transparent photocatalyst-carrying porous body that is extremely excellent in adhesion without any occurrence. Further, by heating and calcining, the titania sol in the pores of the porous substrate is used as a photocatalyst to make titanium oxide whose high-performance crystal form is anatase. For this purpose, the above-described treatment is performed, for example, by gradually heating from room temperature to a final temperature of 400 to 700 ° C. for a certain period of time, and then cooling to room temperature. If the calcination temperature is lower than 400 ° C. or higher than 700 ° C., titanium oxide mixed with rutile or amorphous having low activity as a photocatalyst is not preferable. The firing furnace to be used is desirably a gas furnace having sufficient oxygen required for firing. However, an electric furnace that does not supply oxygen sufficiently can be fired without any problem if oxygen is supplied.

The following is another example of a specific method for immobilizing titanium oxide particles on the surface of the porous substrate and in the pores. In that method, a titanate-based coupling agent is contained in the surface and in the pores of the porous substrate, and then heated and fired.

As the titanate coupling agent, isopropyl triisostearoyl titanate, isopropyl tridodecylbenzenesulfonyl titanate, isopropyl tris (dioctyl pyrophosphate) titanate, tetraisopropyl bis (dioctyl phosphite) titanate, tetraoctyl bis (ditrityl) (Decyl phosphite) titanate, tetra (2,2-
Diallyloxymethyl-1-butyl) bis (ditridecyl) phosphite titanate, bis (dioctylpyrophosphate) oxyacetate titanate, bis (dioctylpyrophosphate) ethylene titanate, isopropyltri (dioctylphosphate) titanate, isopropyltricumylphenyltitanate, isopropyl Examples thereof include, but are not limited to, tri (N-amidoethylaminoethyl) titanate. Further, it may be diluted with a compatible organic solvent for concentration adjustment. After the titanate-based coupling agent is included in the porous body by a known method such as an impregnation method or a dip coating method, and then heated and calcined, the titanate-based coupling agent in the pores of the porous body is used as a photocatalyst for high performance. The crystalline form is titanium oxide, which is anatase. For this purpose, the above-described treatment is performed, for example, by gradually heating from room temperature to a final temperature of 400 to 700 ° C. for a certain period of time, and then cooling to room temperature. Firing temperature 400
When the temperature is lower than 700 ° C. or higher than 700 ° C., it is not preferable because titanium oxide mixed with rutile or amorphous is low in activity as a photocatalyst. The firing furnace to be used is desirably a gas furnace having sufficient oxygen required for firing. However, an electric furnace that does not supply oxygen sufficiently can be fired without any problem if oxygen is supplied.

[0038] In addition to the porous body carrying the photocatalyst particles, a porous body not carrying the photocatalyst particles may be compounded on the surface of the interior substrate. If a predetermined effect can be obtained by this, it is possible to reduce the production cost. The above-mentioned method can be used as a method for producing the alumina-silica coprecipitated xerogel porous body. here,
As the photocatalyst particles are not supported, selected from alumina-silica coprecipitated xerogel porous material, silica gel, γ-alumina porous material, mesoporous zeolite, porous glass, apatite, diatomaceous earth, sepiolite, allophane, imogolite, activated clay At least one is available. The porous body not supporting the photocatalyst is 0.001 to 3 parts by weight based on 1 part by weight of the porous body supporting the photocatalyst particles.
It is preferable to mix by weight. In the porous body on which the photocatalyst is not supported, it is preferable that pores having a radius of 20 to 60 ° have 70% or more of the total pore volume in the pore diameter distribution. A binder may be further added to the interior substrate surface in order to firmly fix the porous body carrying the photocatalyst particles and the porous body not carrying the photocatalyst. In this case, the total weight of the photocatalyst-supporting porous body and the porous body not supporting the photocatalyst is preferably 10 to 600 parts by weight with respect to 100 parts by weight of the binder. Colloidal silica can be suitably used as the binder.
When the porous body that does not support the photocatalyst is γ-alumina, the γ-alumina porous body is treated with alkali or hydrofluoric acid after calcining a kaolin mineral and / or alumina-silica-based coprecipitated gel. Or a kaolin mineral and / or alumina-silica based coprecipitated gel
It can be obtained by treating with alkali or hydrofluoric acid at a temperature of 1200 ° C. for 1 minute to 100 hours.

When the interior substrate is made of an organic substrate such as paper or a synthetic resin sheet, an inorganic film is formed on the surface of the substrate, and then the surface of the film is formed in the same manner as described above. The porous body carrying the photocatalyst particles is fixed on the substrate. In addition,
In this case, the detailed preferable configuration of the porous body on which the photocatalyst particles are supported is described in the above (16th to 3rd).
7 paragraph).

Here, for the inorganic coating, for example, silica, alkali silicate, alkali borate, alumina, borosilicate, zirconia, etc. can be used. Also,
As the inorganic coating, a silicone-based organic-inorganic hybrid resin having a compositionally graded structure, an organic-rich base material side, and an inorganic-rich surface can be used. By using such a resin, the adhesion between the substrate and the porous body carrying the photocatalyst particles is improved.

In the silicone-based organic-inorganic hybrid resin, the solid content of the siloxane compound polymerized by siloxane crosslinking and crosslinking other than siloxane is as follows:
Preferably more than 0.5% by weight and 50% by weight of the solvent
The content is preferably 1% by weight or more and 40% by weight or less. As the solvent, methanol, methyl ethyl ketone, toluene, or the like can be used in addition to isopropyl alcohol. A water-based solvent is more preferable from the viewpoint of the environment, health and the like in the production site of the interior material, the coating of the coating on site, and the like. Further, water for hydrolysis may be added in a necessary molar amount to the silane compound, and a small amount of nitric acid or hydrochloric acid may be further added as a catalyst if necessary.

As a method for coating the surface of the base material of the interior material with an inorganic coating, for example, a spraying method, a printing method, a dipping method and the like can be suitably used.

In a second embodiment as a specific example of a preferred interior wall material in the present invention, a coating containing a porous γ-alumina is formed on the surface of the interior base material, and the surface of the coating is formed on the surface of the coating. An interior wall material in which a porous body carrying photocatalyst particles is fixed, wherein the pore size distribution of the porous body carrying the photocatalyst particles is 2 to 10 nm in radius, and the average particle size of the photocatalyst particles is 30 nm or less. The pore size distribution of the porous substrate before supporting the photocatalyst has a radius of 20 to 30 n.
m.

In this case, the detailed preferred structure and manufacturing method of the porous body carrying the photocatalyst particles are the same as those described above (paragraphs 16 to 37).

A specific method for producing a coating film containing a porous γ-alumina material is obtained, for example, by calcining a kaolin mineral and / or alumina-silica-based coprecipitated gel and treating it with an alkali or hydrofluoric acid. It is obtained by coating a porous γ-alumina body and a binder for forming a coating film on the surface of the interior base material and curing.

As the coating film forming binder, for example, alkali metal silicate, colloidal silica, fluororesin or siloxane resin can be used. In particular, alkali metal silicate, colloidal silica and organic groups are substantially used. It is preferable to use a siloxane resin not containing. Since these substances have good affinity for water and do not repel water, the porous body carrying photocatalyst particles absorbs water vapor.
This is because the moisture release balance is not changed.

When an alkali metal silicate is used, a sodium salt, a potassium salt, a lithium salt or the like can be used alone or in combination. These alkali metal silicates can be preferably used in the form of water glass.

As the fluororesin, fluorine-containing copolymers such as vinyl ether-fluoroolefin copolymers and vinylester-fluoroolefin copolymers, polytetrafluoroolefins, polyvinyl fluorides, polychlorinated trifluoride olefins and the like are preferably used. it can. As the silicone resin, alkyl silane, silicone resin or the like which is a polymer of a silane compound having a hydrophobic group such as fluoroalkyl silane, or an inorganic silane compound using tetramethoxysilane, tetraethoxysilane or the like as a raw material is preferable. Available.

Further, it is more preferable that the coating film forming binder is porous. As a result, moisture absorption of water vapor and adsorption / decomposition of harmful chemicals can be caused not only by the photocatalyst-supporting porous body and the γ-alumina porous body on the coating surface but also by the photocatalyst-supporting porous body and the γ-alumina porous body present inside the coating. It absorbs and decomposes moisture and harmful chemical substances, and can improve the moisture absorption and desorption properties and the adsorption and decomposition properties of harmful chemical substances. In order to make the coating film forming binder porous, for example, colloidal silica may be used.

In the above, it is preferable that 10 to 600 parts by weight of the porous γ-alumina is contained with respect to 100 parts by weight of the binder for forming the coating film. Film forming binder 100
By using 10 to 600 parts by weight of the γ-alumina porous body with respect to parts by weight, the γ-alumina porous body has a function of trapping harmful gases and odorous gases, and a function of increasing the volume capable of absorbing water vapor while maintaining the interior. Can firmly adhere to the substrate

[0050]

The present invention will be described more specifically with reference to the following examples. Example 1 [Preparation of Photocatalyst-Supported Porous Body] Preparation of Alumina-Silica Coprecipitated Xerogel Porous Body SiO2 / Al2O3 = 96/4 mol% Aluminum nitrate nonahydrate and tetraethyl orthosilicate were dissolved in ethanol so as to have the above composition. At this time, a predetermined amount of water was added as needed to prepare a solution. After stirring this solution for 3 hours, 25% aqueous ammonia was added instantaneously to cause co-precipitation and gelation, and was rapidly dried using a rotary evaporator.
It was calcined for an hour to obtain an alumina-silica coprecipitated xerogel porous body.

Using the alumina-silica coprecipitated xerogel porous material, a photocatalyst-supporting porous material was prepared. Mixing of coating agent g • Titanium tetraisopropoxide 100 • Diethanolamine 40 • 2-propanol 630 After preparing the coating agent as described above, the mixture is stirred with a magnetic stirrer for 30 minutes. In the pretreatment of the alumina-silica coprecipitated xerogel, the porous body is immersed in a 2-propanol solution, and then sufficiently dried. In a 1 L glass beaker containing 20 g of alumina-silica coprecipitated xerogel porous material,
The previously prepared titania sol was charged until it was sufficiently immersed. After allowing to stand for 30 seconds as it was, the beaker was tilted to discharge excess titania sol. The alumina-silica coprecipitated xerogel porous body thus obtained was heated and gradually heated from room temperature to 600 ° C. while supplying oxygen by using a gas replacement furnace, and calcined. A porous body was obtained.

The measuring method was as follows. X-ray diffraction analysis: After the sample was sufficiently ground in an agate or an alumina mortar, the crystal phase was identified by powder X-ray diffraction (XRD). For the measurement, an X-ray diffractometer [Geigerflex] manufactured by Rigaku Corporation was used. BET specific surface area and pore size distribution measurement: Specific surface area of each sample was measured by the BET method using nitrogen adsorption, and pore size distribution was analyzed using the desorption-side isotherm. J. H. Performed by the method. For the measurement, a specific surface area / pore distribution measuring device (ASAP 2000, manufactured by Micromeritics Co., Ltd.) was used. In measurement, about 0.1 g of a sample was used. Degassing is 12
Performed at 0 ° C. for less than 10 −3 torr for 1-2 hours. Water vapor adsorption characteristic measurement: Adsorption equilibrium measurement device (EAM-0)
2, JT Toshi Co., Ltd., at 25 ° C. and a relative humidity of 1
It was measured in the range of 0 to 95%. TEM observation: Transmission electron microscope (H90 manufactured by Hitachi, Ltd.)
0).

Table 1 shows the specific surface area and the total pore volume of the obtained alumina-silica coprecipitated xerogel porous material and photocatalyst-supporting porous material. In Table 1, the pore size distribution of the photocatalyst-supporting porous body is shown in FIG. 1, and the measurement of water vapor adsorption characteristics is shown in FIG.
Note that zeolite was also measured for comparison in measuring the water vapor adsorption characteristics.

[0054]

[Table 1]

From Table 1, it can be seen that the photocatalyst-supported alumina-silica coprecipitated xerogel porous material has a high specific surface area and has a very large total pore volume and a very large photocatalyst support.
Further, as shown in FIG. 1, it has a sharp pore distribution in the targeted pore diameter range, and from the aforementioned Kelvin capillary aggregation theory, it is autonomous within a range of 50 to 70% relative humidity, which is considered to be comfortable. It can be expected that humidity control will be performed. Further, as is apparent from the water vapor adsorption isotherm of the photocatalyst-supporting porous body and the zeolite of the present invention at a temperature of 25 ° C. shown in FIG. 2, zeolite has a large amount of moisture absorption even in a low humidity region, and has a high moisture absorption in a high humidity region. There is not much difference with quantity. For this reason, the amount of moisture absorption / release when the relative humidity fluctuates from low humidity to high humidity is not so large. On the other hand, the photocatalyst-supporting porous body of the present invention has a small amount of moisture absorption in a low humidity region, a large amount of moisture absorption rapidly in a medium humidity region, and a large amount of moisture absorption / desorption. ADVANTAGE OF THE INVENTION According to the photocatalyst carrying porous body of this invention, the indoor relative humidity can be adjusted to the humidity range which a person feels comfortable.

As a result of examining the obtained photocatalyst-supporting porous body by X-ray diffraction, the crystal structure of titanium oxide was found to be anatase 10
It was 0%. According to SEM observation, the thickness of the titanium oxide thin film on the surface was 0.03 μm, and the titanium oxide content of the obtained photocatalyst-carrying porous body was 0.45% by weight (dried at 200 ° C.). Weight basis).
When the specific surface area of the photocatalyst-supporting porous body was measured,
It has a high specific surface area of m ² / g, indicating that the pores of the alumina-silica coprecipitated xerogel porous body are not blocked by the photocatalytic coating. This has also been confirmed by observing the pores of the photocatalyst-supporting porous body by TEM observation.

[Preparation of Coating Sample Mixed with Photocatalyst-Supported Porous Body] A 10 cm square pet film was used as a substrate. The painted surface of the pet film is thoroughly degreased by wiping with 2-propanol, and then subjected to corona discharge treatment.
Make the coat easy to apply. Formulation of coating agent containing photocatalyst-supporting porous body g Photocatalyst-supporting porous body 100 Silicone coating agent (X-24-2327 manufactured by Shin-Etsu Chemical) 100 As described above, photocatalyst-supporting alumina-silica coprecipitated xerogel porous body and silicone After mixing the coating agent, the surface-treated pet film was painted using a brush so as to have a uniform film thickness. After the coating, the coating was dried at room temperature for 24 hours and cured. Comparative Example 1 A coating sample was prepared in the same manner as in Example 1 except that zeolite was used instead of the photocatalyst-supporting porous body, and used for comparison. Comparative Example 2 A commercially available vinyl cloth was cut into the same size as the example,
Used for comparison.

[Evaluation method] Measurement method of humidity control characteristics: A sample is exposed to a predetermined area in a closed space of a predetermined volume, and a change in temperature and humidity and a change in relative humidity when a temperature change is applied to the closed space from the outside. The humidity control properties were determined. When the humidity control action does not work, the relative humidity greatly fluctuates depending on the temperature fluctuation, but when the humidity control action works, the change in the relative humidity is suppressed. The degree of suppression of this variation was determined from the difference between the highest humidity and the lowest humidity measured in the space, and the humidity control characteristics were evaluated. -Measurement method of moisture absorption / desorption characteristics: First, 25 measurement samples were used.
° C, 50% R.C. H. Equilibrate in a constant temperature and humidity chamber. The sample was then subjected to 25 ° C., 90% R.C. H. Put into a constant temperature / humidity chamber and measure the moisture absorption over 24 hours. Then, again at 25 ° C. and 50% R.F. H. And put in a constant temperature and humidity chamber to measure the amount of moisture release. -Formaldehyde decomposition / removal test: A sample was placed in a desiccator, and after a formaldehyde gas was injected, the sample was irradiated with light and the change in concentration over time was measured. The light source used was a 10 W fluorescent lamp (Paluk, manufactured by Matsushita Electric Works), the UV illuminance applied to the sample (UVR-2, manufactured by Topcone) was 5.0 μW / cm ² , and the gas concentration was measured by Gastech Gas. A detector tube was used.

[Experimental Results] Measurement Results of Humidity Control Characteristics Table 2 shows the measurement results.

[0060]

[Table 2]

As is clear from Table 2, in Example 1 where the photocatalyst-supporting porous material was mixed, the variation in relative humidity was significantly suppressed, and excellent humidity control characteristics were obtained as compared with the zeolite-coated film and vinyl cloth. Is shown.

[0062]

[Table 3]

The photocatalyst-supported porous mixed coating film shows superior moisture absorption / desorption characteristics as compared with the mixed coating film and vinyl cloth, and retains the moisture absorbing ability even when the high humidity state continues for a long time like the rainy season. And no dew condensation occurs.

Results of Formaldehyde Decomposition Removal Test FIG. 3 shows the results of the test. Example 1 in which the photocatalyst-supporting porous material was mixed showed excellent decomposition and removal performance of formaldehyde as compared with the zeolite-mixed coating film and vinyl cloth. Furthermore, when a reduced amount of formaldehyde was injected and then irradiated with light, the same removal performance was exhibited.
The same test was repeated 10 times, and always showed excellent decomposition removal performance.

[0065]

According to the present invention, when it is generally used indoors, it is excellent in the function of absorbing and releasing moisture, and excellent in the function of decomposing harmful gases and odors by the photocatalyst, and is relatively low in industrial use. An interior material that can be manufactured at a low cost can be provided.

[Brief description of the drawings]

FIG. 1 is a pore size distribution diagram of a photocatalyst-supported porous body obtained by coating a photocatalyst on an alumina-silica-based coprecipitated xerogel body of Example 1.

FIG. 2 is a graph showing water vapor adsorption isotherms at 25 ° C. of the photocatalyst-supporting porous body and zeolite of Example 1.

FIG. 3 is a graph showing the results of a formaldehyde decomposition and removal test of Example 1 and Comparative Examples 1 and 2.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D06M 11/45 E04B 1/64 D 4L031 11/46 E04F 13/08 A 11/79 D06M 11/12 E04B 1 / 64 E04F 13/08 F-term (reference) 2E001 DB03 FA03 FA10 GA24 GA27 GA28 HA03 HA04 HA21 HA33 HB01 HC04 HC07 HD11 JB07 2E110 AA16 AA64 AB04 AB23 BA02 BA12 GA32X GB42X GB63X 4F055 AA17 BA11 BA17 BA30 CA13 EA22 AA01A24 AA03C AA19C AA20C AA21B AA25B AA27C AA28B AA31C AA34B AB01A AB02B AB16B AB17B AB18B AB24B AB25B AC03C AC04C AC10C AE06A AE09A AG00A AG00C AK01A AP03A AT00A BA02 BA03 BA07 CA30B DE01B DG01A DG10A DG12A DG15A DJ01A DJ01C EH46 EJ08 EJ48 EJ67 GB08 JA11B JC00 JD15 JL02 JL08 JM01C JM02C 4G069 AA03 AA08 BA01A BA02A BA03A BA04A BA04B BA32A BC12A BC22A BC31A BC32A BC33A BC35A BC50A BC50B BC66A BC68A BC70A BC71A BC72A BC75A CA10 CA17 DA06 FA02 FA06 FB09 FB30 4L031 AB31 BA09 BA20 DA12 DA13

Claims (40)

[Claims] 1. An interior wall material comprising a porous body carrying photocatalyst particles fixed to the surface of an interior substrate, wherein the pore size distribution of the porous body carrying the photocatalyst particles is 2 to 10 n.
m, the average particle diameter of the photocatalyst particles is 30 nm or less, and the pore size distribution of the porous substrate before supporting the photocatalyst is a radius of 20 to 30 nm. Interior wall material having. 2. An inorganic coating is formed on the surface of an interior base material made of an organic base material such as paper or a synthetic resin sheet, and a porous body carrying photocatalyst particles is fixed on the surface of the coating. The interior wall material, wherein the pore size distribution of the porous body carrying the photocatalyst particles is a radius of 2 to 10 nm, the average particle size of the photocatalyst particles is 30 nm or less, and the porous substrate before carrying the photocatalyst is provided. The interior wall material having a function of absorbing and releasing water vapor and a function of photocatalyst, characterized by having a pore diameter distribution of 20 to 30 nm in radius. 3. The method according to claim 1, wherein the inorganic coating is silica, alkali silicate, alkali borate, alumina, borosilicate,
3. The zirconia material according to claim 2, wherein the zirconia is zirconia.
The moisture control / photocatalyst interior wall material described in (1). 4. An interior wall material in which a coating containing a γ-alumina porous material is formed on the surface of an interior base material, and a porous material having photocatalyst particles supported on the surface of the coating is fixed. The pore size distribution of the porous body on which the photocatalyst particles are supported has a radius of 2 to 10 nm, and the average particle size of the photocatalyst particles is 30.
nm or less, and the pore size distribution of the porous substrate before supporting the photocatalyst has a radius of 20 to 30 nm. 5. The absorption and release of water vapor according to claim 4, wherein in the porous γ-alumina, pores having a radius of 2 to 6 nm have 70% or more of the total pore volume in the pore diameter distribution. Interior wall material with moisture function and photocatalytic function. 6. The coating containing the γ-alumina porous material contains a coating-forming binder in addition to the γ-alumina porous material, and the γ-alumina porous material is added to 100 parts by weight of the coating film-forming binder. The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to claim 4 or 5, which comprises 10 to 600 parts by weight. 7. The porous substrate is selected from alumina-silica coprecipitated xerogel porous material, silica gel, γ-alumina porous material, mesoporous zeolite, porous glass, apatite, diatomaceous earth, sepiolite, allophane, imogolite and activated clay. The interior wall material having a function of absorbing and releasing water vapor and a function of photocatalyst according to claim 1, wherein the interior wall material is at least one of the following. 8. The water vapor absorption / desorption function according to claim 1, wherein the photocatalyst particles are made of at least one selected from titanium oxide, zinc oxide, strontium titanate, tin oxide, vanadium oxide and tungsten oxide. And interior wall materials with photocatalytic function. 9. The photocatalyst particle, wherein at least one metal selected from platinum, rhodium, ruthenium, palladium, gold, silver, copper, iron, nickel and zinc is fixed. Item 9. An interior wall material having a function of absorbing and releasing water vapor and a function of photocatalyst according to items 1 to 8. 10. The interior wall material according to claim 1, wherein the photocatalyst particles are made of crystalline titania. 11. The porous substrate is an alumina-silica-based coprecipitated xerogel porous body, and the alumina-silica-based coprecipitated xerogel porous body is prepared from aluminum nitrate hydrate and tetraethyl orthosilicate, and heated. The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to claim 1, which is obtained by firing. 12. The porous substrate is a γ-alumina porous material, and the γ-alumina porous material is calcined with a kaolin mineral and / or alumina-silica-based coprecipitated gel and then treated with alkali or hydrofluoric acid. The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to claim 1, wherein the interior wall material is obtained by performing a treatment. 13. The porous body is a γ-alumina porous body, and the γ-alumina porous body contains a kaolin mineral and / or alumina-silica-based coprecipitated gel of 900 to 12%.
The interior wall material having a water vapor absorption / desorption function and a photocatalytic function according to claim 1, wherein the interior wall material is obtained by treating with an alkali or hydrofluoric acid at a temperature of 00 ° C. for 1 minute to 100 hours. . 14. The steam according to claim 1, wherein the photocatalyst particles are fixed on the surface of the porous body and in the pores using an alkali metal silicate as a binder. Interior wall material with moisture absorption / release function and photocatalytic function. 15. The porous body carrying the photocatalyst particles comprises 100 parts by weight of photocatalytic titanium oxide particles and 1 to 30 parts by weight.
The water vapor absorption / desorption function and the photocatalytic function according to claim 14, wherein the aqueous liquid containing a part by weight of an alkali metal silicate is obtained by applying the aqueous liquid to the surface and in the pores of the porous body and curing the applied liquid. Interior wall material having. 16. The porous body carrying the photocatalyst particles is obtained by applying a dispersion obtained by dispersing a solid containing photocatalytic titanium oxide particles in a solvent to the surface of the porous body and in the pores and curing the dispersion. The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to any one of claims 1 to 15, wherein a concentration of a solid content in the dispersion is 0.01 to 5 wt%. 17. The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to claim 16, wherein the solvent comprises an inorganic and / or organic solvent. 18. The porous body on which the photocatalyst particles are supported, wherein a titania sol prepared from an alkoxide of titanium and an alcoholamine or a glycol is contained in the surface and in the pores of the porous body, and then heated and fired. The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to any one of claims 1 to 16, which is obtained by: 19. The porous body carrying the photocatalyst particles, wherein the concentration of the titanium alkoxide in the solvent is 0.01 to 0.01.
19. The water vapor absorption / desorption function according to claim 1, wherein the titania sol is adjusted to 1 mol / l, and the titania sol is contained in the surface and the pores of the porous substrate and then heated and calcined. Interior wall material with photocatalytic function. 20. The porous body on which the photocatalyst particles are supported is obtained by adding a sol obtained by adding polyethylene glycol or polyethylene oxide to a titania sol on the surface and in the pores of a porous base material, followed by heating and firing. 20. The interior wall material according to claim 1, which has a function of absorbing and releasing water vapor and a function of photocatalyst. 21. The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to claim 20, wherein the polyethylene glycol or polyethylene oxide having a molecular weight of 200 or more is used. 22. The porous body on which the photocatalyst particles are supported can be obtained by including a titanate-based coupling agent on the surface and in the pores of a porous base material, followed by heating and firing. Item 22. An interior wall material having a moisture vapor absorbing / releasing function and a photocatalytic function according to Item 1 to 21. 23. The heating and sintering is performed gradually from room temperature to 60.
23. The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to claim 13, wherein the material is heated to a final temperature of 0 ° C. to 700 ° C. and fired. 24. The water vapor absorption according to claim 1, wherein a porous body not carrying a photocatalyst is blended on the surface of the interior base material, in addition to the porous body carrying the photocatalyst particles. Interior wall material with moisture release function and photocatalytic function. 25. A photocatalyst of 0.001 to 3 parts by weight per 1 part by weight of the porous body carrying the photocatalyst particles is provided on the surface of the interior base material in addition to the porous body carrying the photocatalyst particles. 25. The interior wall material according to claim 24, wherein the interior wall material has a function of absorbing and releasing water vapor and a function of photocatalyst. 26. The porous body in which the photocatalyst is not supported, wherein pores having a radius of 20 to 60 ° have 70% or more of the total pore volume in the pore diameter distribution.
6. An interior wall material having a function of absorbing and releasing water vapor and a function of photocatalyst according to 5. 27. The porous body on which the photocatalyst is not supported includes alumina-silica coprecipitated xerogel porous body, silica gel, γ-alumina porous body, mesoporous zeolite,
27. The interior wall having a function of absorbing and releasing water vapor and a function of photocatalyst according to claim 24, which is at least one selected from porous glass, apatite, diatomaceous earth, sepiolite, allophane, imogolite, and activated clay. Wood. 28. The porous body not supporting the photocatalyst is a γ-alumina porous body, and the γ-alumina porous body is obtained by calcining a kaolin mineral and / or an alumina-silica-based coprecipitated gel, 28. The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to claim 27, which is obtained by treating with an alkali or hydrofluoric acid. 29. The porous body on which the photocatalyst is not supported is a γ-alumina porous body, and the γ-alumina porous body is made of kaolin mineral and / or alumina-silica-based coprecipitated gel at 900 to 1200 ° C. At a temperature of 1 minute to 100
The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to claim 27, which is obtained by treating with alkali or hydrofluoric acid for a time. 30. The base material is a metal plate, paper, synthetic resin sheet, gypsum board, particle board, ceramic panel, siding panel, calcium silicate plate concrete plate, woven fabric, nonwoven fabric, glass fiber sheet, metal fiber
The interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to any one of claims 1 to 29, wherein the interior wall material is one of a glass fiber composite sheet, a flame retardant backing paper, and an inorganic interior base material. 31. The interior having a function of absorbing and releasing water vapor and a function of photocatalyst according to claim 1, wherein the photocatalyst particles are present in a range of 2000 μm or less in a vertical direction from a surface in contact with outside air. Wall material. 32. The interior having a function of absorbing and releasing water vapor and a function of photocatalyst according to claim 1, wherein the photocatalyst particles are present in a range of 1000 μm or less in a vertical direction from a surface in contact with outside air. Wall material. 33. The interior according to claim 1, wherein the photocatalyst particles are present within a range of 500 μm or less in a vertical direction from a surface in contact with outside air. Wall material. 34. The interior according to claim 1, wherein the photocatalyst particles are present in a range of 10 μm or more in a vertical direction from a surface in contact with outside air. Wall material. 35. The interior having a function of absorbing and releasing water vapor and a function of photocatalyst according to claim 1, wherein the photocatalyst particles are present in a range of 50 μm or more in a vertical direction from a surface in contact with outside air. Wall material. 36. The interior having a function of absorbing and releasing water vapor and a function of photocatalyst according to claim 1, wherein the photocatalyst particles are present in a range of 100 μm or more in a vertical direction from a surface in contact with outside air. Wall material. 37. A porous body not carrying a photocatalyst and a binder, in addition to the porous body carrying the photocatalyst particles, are fixed to the surface of the interior base material.
39. An interior wall material having a function of absorbing and releasing water vapor and a function of a photocatalyst according to any one of 9 to 36. 38. The porous body on which the photocatalyst is not supported includes alumina-silica coprecipitated xerogel porous body, silica gel, γ-alumina porous body, mesoporous zeolite,
The interior wall material according to claim 37, which is at least one selected from porous glass, apatite, diatomaceous earth, sepiolite, allophane, imogolite, and activated clay. 39. The interior wall material having a function of absorbing and releasing water vapor and a function of photocatalyst according to claim 37, wherein the binder is colloidal silica. 40. The binder according to 100 parts by weight,
The interior having a moisture absorption / release function and a photocatalyst function according to claim 37 or 38, wherein the total weight of the photocatalyst-supporting porous body and the photocatalyst-supporting porous body is 10 to 600 parts by weight. Wall material.