JPH11254632A - Interior finishing decorative material having photocatalytic function and moisture absorbing and dissipating property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a decorative material having high safety and moisture absorbing and dissipating properties by a method wherein a resin layer having a photocatalytic activity is formed on a resin layer including a moisture absorbing and dissipating material. SOLUTION: An interior finishing decorative material 1 is produced by providing a moisture absorbing and dissipating material-containing resin layer (a moisture absorbing and dissipating resin layer) 3 on the surface of a decorative sheet base material 2 and forming a resin layer having a photocatalytic activity (a photocatalytic resin layer) 4 on this moisture absorbing and dissipating resin layer 3. The photocatalytic resin layer 4 can be made by adding a material having the photocatalytic activity to a base material resin. Further, the interior finishing decorative material 1 may be made by adding a material having the photocatalytic activity such as photocatalytic carriers 5 in the moisture absorbing and dissipating resin layer 3 provided on the decorative sheet base material 2. Furthermore, when the strength and physical properties as a decorative sheet are satisfied by the moisture absorbing and dissipating resin layer 3 only, the decorative sheet base material 2 can be dispensed with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative material having a moisture absorbing / releasing property capable of reducing the variation of the relative humidity of the atmosphere and a photocatalytic function and used for interiors of buildings and vehicles.

[0002]

2. Description of the Related Art Heretofore, as a typical interior decoration material such as wallpaper, a material having a polyvinyl chloride resin layer formed on a substrate has been used. However, this decorative material has poor moisture absorption and desorption properties. Does not have an adjustment function.

When the humidity rises in a room or the like in which the above-mentioned decorative material is installed, not only the discomfort index increases, but also, when the surface or wall of the decorative material is hollow, dew condensation occurs inside the hollow, Molds, bacteria (hereinafter collectively referred to as fungi) or mites may be generated on the surface of the cosmetic material or inside the wall.
There is a problem that corrosion and rust occur in building materials.

[0004]

Therefore, as the above-mentioned decorative material, there is known a decorative material which is provided with a surface layer in which a porous material or the like is contained in a resin layer so as to have a moisture absorbing and releasing property.
However, this cosmetic material still has a problem that fungi and mites are generated on the cosmetic material itself due to moisture absorption of the surface layer.

In order to solve the above problems, it is conceivable to add an organic antifungal agent or the like to the surface layer of the decorative material. However, considering that the interior decorative material is used for a part that can easily touch the human body such as a wall covering material, an organic antifungal material has a problem in terms of safety.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a moisture absorbing / releasing property, whereby it is possible to converge a fluctuation range of humidity due to a change in external temperature, and to absorb moisture. An object of the present invention is to provide a cosmetic material having high hygroscopicity and high safety by preventing the occurrence of fungi and mites on the cosmetic material itself.

[0007]

According to the present invention, there is provided (1) a photocatalytic function and a moisture absorption / release property wherein a resin layer having photocatalytic activity is formed on a resin layer containing a moisture absorption / release material. And (2) an interior decorative material having a photocatalytic function and moisture absorption / release properties, wherein the resin layer containing the moisture absorbing / releasing material contains a material having photocatalytic activity. It is an abstract.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the interior decorative material 1 of the present invention
A resin layer (moisture-absorbing / desorbing resin layer) 3 containing a moisture-absorbing / desorbing material is provided on the surface of the decorative sheet substrate 2, and a photocatalytically active resin layer ( Photocatalytic resin layer) 4
Can be formed. In addition, interior decoration material 1
As shown in FIG. 2, a material having photocatalytic activity such as a photocatalyst carrier 5 may be contained in a moisture absorbing / releasing resin layer 3 provided on a decorative sheet substrate 2. In addition, when only the moisture absorbing / releasing resin layer 3 has sufficient strength and physical properties as a decorative sheet, the decorative sheet substrate 2 can be omitted in either of the embodiments of FIGS.

The decorative sheet substrate 2 has a basis weight of 20 to 170 g.
/ M ² high-quality paper, tissue paper, wallpaper backing paper, paper such as Japanese paper, or woven fabric, non-woven fabric, or polyvinyl chloride resin or olefin resin made of fiber such as glass fiber, asbestos, polyester fiber, or vinylon fiber It is preferable to use a resin sheet such as a polyester resin. Flame retardants such as aluminum hydroxide powder and antimony oxide powder can also be added to the decorative sheet substrate.

The moisture absorbing / releasing resin layer 3 is formed as a resin layer in which a moisture absorbing / releasing material 31 is dispersed in a binder resin 32 as shown in FIG. As the moisture absorbing / releasing material, for example, moisture absorbing / releasing agent particles which do not dissolve in water, do not deteriorate even when exposed to air for a long time, and are capable of repeating moisture absorption and desorption are used. Examples of the moisture absorbent particles include activated clay (montmorillonite), sepiolite, diatomaceous earth, ettringite,
Inorganic moisture-absorbing / desorbing particles such as shells such as tobermorite and scallop, or saponified graft copolymer of starch and acrylonitrile, cross-linked polyvinyl alcohol, salt of reaction product of polyvinyl alcohol and maleic anhydride And the like, and organic humectant particles such as rice husk and wood. The inorganic moisture absorbing and releasing particles have a porous structure having pores in the particles.

The moisture absorbing / releasing agent particles have a repeated durability of moisture absorbing / releasing,
Inorganic particles are preferred because they are excellent in various properties such as non-swelling property and mold resistance. The moisture absorbent particles have a particle size of 0.1 to 10
A thing of about 0 μm is used. Further, in order to increase the specific surface area and prevent secondary aggregation, the moisture absorbing / releasing agent particles have a particle size of 10%.
Those having a thickness of up to 30 μm are preferred. When the moisture absorbing / desorbing agent particles have a porous structure having pores inside, those having an average pore diameter of 10 to 60 ° and a specific surface area of 100 m ² / g or more are preferred. The preferable addition amount of the moisture absorbing / releasing agent particles to the binder resin is about 10 to 50% by weight. Further, in order to maintain the humidity of the atmosphere in which the interior decorative material is used in the range of 40 to 60%, the pore size of the moisture absorbing / desorbing agent particles should be 10 to 60%.
The inorganic particles having the size of Å are preferred.

The binder resin used for the moisture absorbing / releasing resin layer 2 includes olefin resin, polyester resin, urethane resin, acrylic resin, polyvinyl chloride, fluorine resin, silicon resin and the like.

The olefin resin includes ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, polyisobutylene, polyethylene, polypropylene, polybutene, ethylene-propylene-butene copolymer, polybutadiene, polyisoprene, or Copolymers of these copolymers with one or more ethylenically unsaturated monomers are mentioned. Incidentally, the ethylene-vinyl acetate copolymer also includes these saponified products. The binder resin is ethylene-acetic acid from the viewpoint that the resin itself has moisture absorption and desorption properties, and has good compatibility with the inorganic moisture absorption and desorption agent particles, has good dispersibility, and can be added in a large amount. Vinyl copolymers are preferred.

The moisture absorbing / releasing resin layer 3 may contain a flame retardant such as magnesium hydroxide, aluminum hydroxide, antimony oxide, a coloring agent such as a dye or a pigment, a heat stabilizer, a plasticizer, and an extender, if necessary. Additives such as ultraviolet absorbers can be added.

The moisture absorbing / releasing resin layer 3 is formed by an inflation method,
It is obtained by forming a film on the surface of the decorative sheet substrate 2 using a calendering method, an extrusion method, a casting method, or the like. Further, the moisture absorbing / releasing resin layer 3 is formed in advance, and is adhered to the surface of the decorative sheet substrate 2 by an adhesive or thermocompression bonding, or a liquid composition such as a diluted solution of an organic solvent and an aqueous dispersion emulsion is applied. The solvent (or dispersion medium) may be evaporated and dried to solidify and laminate.

As shown in FIG. 4, the moisture absorbing / releasing resin layer 3 may be formed as a cellular foam having bubbles 33 inside the layer by foaming a binder resin 32. By making the moisture-absorbing / releasing resin layer 3 a cellular foam, the air permeability in the layer becomes better, and the moisture-absorbing / releasing property becomes better.

When the moisture absorbing / releasing resin layer 3 is made of a cellular foam, cavities communicating from the inside of the resin layer to the surface of the resin layer are formed. Such a plurality of cavities communicate with each other. If the communicating cavities are distributed to the inside of the resin layer, the moisture absorption / release effect is better. The cavity may communicate from the front surface to the back surface of the resin layer. In the cellular foam, cavities that are not open on the surface may also exist in parallel. The size of the cavity is usually 10-100μ
m.

In order to make the moisture-absorbing / releasing resin layer 3 into a cellular foam, it is common to apply a composition in which a foaming agent is added to a binder resin, and to foam by heating. Examples of the foaming agent include the following compounds (1) to (3).

(1) A microcapsule type in which a volatile and thermally expandable substance such as butane, hexane, and pentane is contained in a hollow body of a resin such as acrylonitrile, vinylidene chloride, a vinylidene chloride-acrylonitrile copolymer or the like. Foaming agent. (2) azodicarbonamide, azobisisobutyronitrile, 4─4′─oxybisbenzenesulfonylhydrazide, NN-dinitrosopentamethylenetetramine,
Pyrolytic foaming agents such as ammonium bicarbonate, ammonium carbonate and sodium boron hydride. If necessary, foaming accelerators such as metal soaps such as lead, calcium and tin, dibasic lead sulfite, tribasic lead and zinc white are added. (3) A mixture of the above (1) and (2).

The amount of the foaming agent added is 100
It is usually about 1 to 10 parts by weight based on parts by weight. Also,
By adding a relatively large amount of a thermal decomposition type foaming agent or adding a surfactant to the resin, a cavity opened on the surface of the moisture absorbing / releasing resin layer can be formed.

Further, a non-foamed moisture-absorbing / resin layer formed in advance so that the moisture-absorbing / desorbing agent particles are contained inside the layer is uniaxially or biaxially stretched to form a structure similar to a cellular foam. it can. Due to the stretching of the moisture absorbing / releasing resin layer, voids are formed around the foaming agent particles in the resin layer due to shear stress (although not as extreme as the cellular foam shown in FIG. 4), Bubbles similar to foam are formed.

The thickness of the moisture absorbing / releasing resin layer 3 is preferably about 50 to 300 μm regardless of whether the resin layer is a foam or a non-foam.

When the moisture absorbing / releasing resin layer 3 is formed, a heating / melting resin not containing water is cooled and solidified to form a film. In comparison with the coating method using the material, the resin and the inorganic absorbing and releasing agent are not absorbed until the water and organic components are adsorbed by the inorganic moisture absorbing and releasing particles in the composition or the paint (liquid) is solidified. There is an advantage that there is no fear that the moisture absorbing / releasing effect of the moisture absorbing / releasing resin layer is reduced due to separation and sedimentation with the wetting agent particles.

The photocatalytic resin layer 4 can be formed by adding a material having photocatalytic activity to a base resin. Materials having photocatalytic activity include all those generally called "photocatalysts". Specifically, when irradiated with light of a specific wavelength, a chemical reaction occurs, thereby decomposing various organic substances and the like. A substance that acts or has an antibacterial or antifungal action. More specific functions of the photocatalyst include a bad odor-causing substance such as acetaldehyde, formaldehyde, methyl mercaptan, hydrogen sulfide, ammonia, and trimethylamine; pollutants in the air such as nitrogen oxides (NO _x ); oil mist and oil stains. And decomposition of cigarette tar, bacteria, mold and the like.

Examples of the material having photocatalytic activity (photocatalyst) include titanium dioxide (TiO ₂ ), zinc oxide (ZnO), and cerium oxide (CeO) having an anatase type crystal structure. Among the above photocatalysts,
High catalytic activity can be obtained even in the illumination light required for daily life, no special light source is required, it is chemically stable, and photocatalytic function can be obtained for a long period of time, non-toxic, inexpensive and advantageous in cost For example, anatase type titanium dioxide is particularly preferable.

A spectral sensitizer may be added to the photocatalyst to shift the upper limit of the photosensitive wavelength for the photocatalytic action of anatase type titanium dioxide to the longer wavelength side. As such a spectral sensitizer, a dye that absorbs visible light is used, and examples thereof include ruthenium complexes such as Ru (4,4'-dicarboxyl-2,2'bipyridine) ₂ (NCS) ₂ .

The photocatalyst may be directly added to the base resin constituting the photocatalytic resin layer 4, but in order to prevent the resin containing or adjacent thereto from being decomposed, the photocatalyst is supported on an inorganic porous material. It is preferable that the photocatalyst carrier is added to the resin as a photocatalyst carrier, and the photocatalyst carrier is dispersed in the photocatalyst resin layer. If these photocatalysts are directly added to the base resin, a fluororesin or a silicon resin which contains the photocatalyst or is not decomposed by the photocatalyst as a resin component adjacent thereto is used.

The inorganic porous material for supporting the photocatalyst has transparency to light having a wavelength at which the catalytic activity of the photocatalyst can be obtained depending on the combination with the photocatalyst to be supported, and transmits such light. What is obtained is appropriately selected. For example, when anatase-type titanium dioxide is used as a photocatalyst, anatase-type titanium dioxide can obtain catalytic activity with near ultraviolet light having a wavelength of 380 nm or less.
A material that transmits near-ultraviolet light having the following wavelengths is used. However, when a spectral sensitizer is added, it is only necessary that the material be transparent to wavelengths equal to or shorter than the upper limit (absorption edge) of the extended photosensitive wavelength.

Specific examples of the inorganic porous material include zeolite, silica gel, silica alumina, cement, tricalcium silicate, calcium silicate, porous glass, aluminum hydroxide, and magnesium carbonate. Among these, it is preferable to use silica gel or zeolite from the viewpoint of the suitability of supporting the photocatalyst and the adsorbability of the product decomposed by the photocatalyst.

The method for producing the photocatalyst carrier 4 and the specific form of the photocatalyst carrier are not particularly limited.
The photocatalyst carrier 5 shown in (a) to (c) is exemplified. As shown in FIG. 5 (a), the photocatalyst carrier 5 has a form in which a photocatalyst 8 is carried at an arbitrary position in a hole 7 of a massive inorganic porous body 6, and as shown in FIG. The porous body 6 is formed in a hollow shape, and the photocatalyst 8 is supported on the hollow inner wall surface 9, as shown in FIG. 2C, the inside of the hole 7 of the inorganic porous body 6 having a hollow inside. The photocatalyst 8 may be supported at an arbitrary location, and a porous body 10 of the same type or different from the porous body 6 may be filled in the hollow portion.

In order for the photocatalyst carrier to have a sufficient photocatalytic function, the inorganic porous material 1 must have an average crystal grain size of 5 to 200 nm and a specific surface area of 10 to 300 m ² / g.
It is preferable that 10 to 900 parts by weight of the photocatalyst is supported with respect to 00 parts by weight. In order to further impart an antibacterial effect, the photocatalyst carrier may adsorb or carry Ag ions.

The photocatalyst resin layer 4 is obtained from a composition in which the photocatalyst carrier 5 is added to a base resin.
The base resin behaves as an aggregate due to the cohesive force acting between the resin molecules. Further, the affinity between the organic base material resin and the inorganic porous body of the photocatalyst carrier is poor. Further, the photocatalyst carrier 5
It is easy for air to enter inside the hole 7 or between the photocatalyst carrier 5 and the base resin. Therefore, in the photocatalyst resin layer 4, the base resin hardly penetrates into the pores 7 of the inorganic light porous body 6 and is prevented from being decomposed by contact with the photocatalyst 8.

Even if the base resin enters the holes 7 of the inorganic porous body 6, the base resin is not decomposed unless the photocatalyst 8 is present therein, and the base resins enter the holes 7. Even if the base resin is decomposed by the photocatalyst 8, the base resin in the vicinity is only locally decomposed, and the action of the photocatalyst 8 does not reach the entire base resin, and the photocatalyst carrier 5 falls off. Does not lead to loss of the photocatalytic function.

Atmospheric pollution, which is a subject of the photocatalytic function,
Many of the decomposition objects such as malodors, molds, and bacteria are usually molecularly diffused in the air. Therefore, when the decomposition object comes into contact with the photocatalyst resin layer formed on the surface of the interior decoration material, the decomposition object easily enters the pores 4 of the porous body 3 by a diffusion phenomenon, and the photocatalyst carried on the inorganic porous body becomes Decomposed on contact.

In order to prevent the base resin from entering the pores 7 of the inorganic porous body 6 while allowing the decomposition target to enter and selectively decompose the inorganic resin, it is necessary to use an inorganic porous material. The diameter r of the pores 7 appearing on the body surface is preferably 10 nm to 10 μm, and the specific surface area of the inorganic porous body 6 is 10 to 100 m ^2.
/ G is preferred. The particle diameter of the inorganic porous body 6 is
The average particle size is preferably 1 to 100 μm.

In the photocatalyst resin layer 4, the photocatalyst carrier 5
Is not exposed on the surface of the resin layer 4, it is preferable that the object to be decomposed penetrates into the base resin. However, in order to efficiently exhibit the photocatalytic function, as shown in FIGS. In order that the carrier 5 is not completely buried in the photocatalytic resin layer 4,
It is preferable that a part thereof is exposed on the surface. In order to expose the photocatalyst carrier 5 on the surface of the photocatalyst resin layer 4, the amount of the photocatalyst carrier added to the base resin, the thickness of the photocatalyst resin layer 4, and the like may be appropriately adjusted.

The content of the photocatalyst carrier 5 in the photocatalyst resin layer 4 varies depending on the average particle size of the photocatalyst carrier 5 and the like.
It is preferably in parts by weight. By making the thickness of the photocatalyst resin layer 4 equal to or smaller than the average particle diameter of the carrier 5, it is effective to expose the photocatalyst carrier on the surface of the photocatalyst resin layer. Even if the carrier is completely buried in the base resin, a certain effect can be expected as long as air, water vapor, and a substance to be decomposed reach the photocatalyst carrier by diffusion or the like.

As the base resin of the photocatalytic resin layer 4, polysiloxane, polyvinylidene fluoride, polyvinyl fluoride,
Polytetrafluoroethylene, ethylene-tetrafluoroethylene copolymer, a fluorocarbon resin isocyanate-crosslinked with a fluorocarbon having a hydroxyl group or a carboxyl group,
Examples include acrylic resin, polyvinyl acetate, polyester, polyurethane, polyamide, polystyrene, ABS, polycarbonate, epoxy resin, polyolefin resin, and polyvinyl chloride resin. Among these, when contamination resistance is required, it is preferable to use a silicon resin such as polysiloxane or a fluorine resin such as polyvinylidene fluoride. In addition, polysiloxane is close to an inorganic substance and is hardly decomposed by a photocatalyst, and a fluororesin is generally hard to react with radical O ₂ ^— or the like generated by the photocatalyst.

The photocatalyst resin layer 4 is formed by applying a coating composition containing a base resin as a binder and a photocatalyst carrier thereto by a known coating method such as gravure coating, roll coating, spray coating, or the like. It can be formed by coating on the surface of the layer 3. Alternatively, the photocatalytic resin layer 4 may be formed in a sheet shape or a film shape in advance, and the photocatalytic resin layer 4 may be laminated on the moisture absorbing / releasing resin layer 3 directly or via an adhesive or an arbitrary attaching member, and may be integrally provided. Good.

The photocatalytic resin layer 4 may be formed as a cellular foam. Specifically, it can be formed using the same means as described for the moisture absorbing and releasing resin layer 3. The thickness of the photocatalytic resin layer 4 is
Foamed or non-foamed, 1 to 100 μm
It is preferable to form it.

The interior decorative material of the embodiment shown in FIG.
When forming the moisture-absorbing / releasing resin layer 3, a coating composition containing a photocatalytically active material such as the photocatalyst carrier described above, a moisture-absorbing / releasing material, and other additives as necessary is added to a decorative sheet base. A decorative sheet formed by coating on the surface of a material or forming a moisture-absorbing / desorbing resin layer containing a material having photocatalytic activity in the form of a sheet or a film by applying the coating composition in advance. It can be obtained by laminating and bonding and integrating directly or via an adhesive or the like on the surface of the base material.

The decorative material for interior 1 can be formed into various shapes other than being laminated on the decorative sheet substrate and formed into a sheet shape. For example, the decorative sheet base material 2 may be laminated on another base material (decorative material base material). Alternatively, the decorative sheet base material may not be used, and the moisture absorbing and releasing resin layer 3 and the photocatalytic resin layer 4 may be used.
May be directly laminated on the decorative material base material.

The decorative material base material is wood such as wood veneer, wood plywood, particle board, and wood fiber board (MDF);
Metals such as iron, copper and aluminum, polyvinyl chloride,
Acrylic resin, polyolefin resin, polyester resin, ABS resin, phenol resin and other resins, glass,
Examples include ceramics such as ceramics, non-ceramic ceramic materials such as gypsum, calcium silicate, and cement, paper, fabric, and nonwoven fabric.

When a moisture-absorbing / desorbing or water-permeable material such as paper and wood is used as the decorative material substrate, the moisture-absorbing / releasing resin layer 3
The moisture adsorbed on the substrate may penetrate into the back surface (for example, inside the wall) through the base material. In some cases,
The moisture permeating the back surface may cause the back surface to become damp, warp, or generate mold and rust. Therefore, in order to prevent this phenomenon, a moisture-proof / polyethylene terephthalate made of polyethylene, polyvinylidene chloride, silica-deposited, etc. is used on the back side of the decorative material base material.
It is preferable to provide a waterproof layer or the like.

The decorative material for the interior can be provided with decorative properties as long as the photocatalytic function and the moisture absorption / release properties are not impaired. For example, a decoration layer is provided on the surface of the moisture absorbing / releasing resin layer (if the resin layer is transparent, the back surface is also possible). Examples of the decoration layer include a pattern printing layer and a metal thin film layer of aluminum or the like provided by, for example, a known ink and printing method. In this case, it is preferable that the decoration layer is provided partially rather than entirely.

A decorative property can be imparted by adding a known dye or pigment to the interior of the moisture absorbing / releasing resin layer and coloring it. The surface of the moisture-absorbing / releasing resin layer may be embossed with a pattern of concavities and convexities, and the concave portions of the emboss may be filled with a coloring ink by wiping to be colored.

The interior decorative material of the present invention is typically used for interior materials of buildings such as walls, floors, and ceilings, and is also used for vehicles such as automobiles, trains, ships, and aircraft. It is also used for interior materials, doors, fusuma, window frames, fittings such as handrails, furniture such as chests, partitions, containers and the like.

[0048]

Example 1 23 parts by weight of activated clay ("Galeon Earth V2R" manufactured by Mizusawa Chemical Co., Ltd.) having an average particle diameter of 20 μm and an average pore diameter of 25.6% were added to 33.5 parts by weight of an aqueous resin emulsion having the following composition. After being dispersed and coated on a backing paper (manufactured by Tokushu Paper Co., Ltd.) having a basis weight of 150 g / m ² with a thickness of 170 μm,
By heating at 20 ° C. for 1 minute, the aqueous resin emulsion was solidified to form a moisture absorbing / releasing resin layer. Next, a photocatalyst carrier having an average particle size of 5 nm, in which 40 parts by weight of anatase type titanium dioxide was supported on 100 parts by weight of silica gel, on the moisture absorbing and releasing resin layer, was treated with an organic binder (acryl + vinyl chloride-acetic acid). A coating composition containing 50 parts by weight of 100 parts by weight of the vinyl copolymer two-part curable transparent resin) was applied to a thickness of 12 μm by gravure coating to form a photocatalytic resin layer. 170 ° C in a heating and foaming furnace,
The foam was heated and foamed for 1 minute to obtain a moisture absorbing / releasing wall material sheet having photocatalytic activity.

[Composition of water-based resin emulsion]-23 parts by weight of ethylene-vinyl acetate copolymer-5 parts by weight of microcapsule type foaming agent ("F-85" manufactured by Matsumoto Yushi Co., Ltd.)-5 parts by weight of titanium oxide-Hindered amine-based 0.5 parts by weight of radical scavenger

Example 2 100 parts by weight of activated clay ("Galeon Earth V2R" manufactured by Mizusawa Chemical Co., Ltd.) having an average particle diameter of 20 μm and an average pore diameter of 25.6%, and 40 parts by weight of anataveze type titanium dioxide with respect to 100 parts by weight of silica gel. 5nm average particle size
Was dispersed in 33.5 parts by weight of an aqueous emulsion having the following composition, and the basis weight was 150 g / m ^2.
Is coated on a backing paper (manufactured by Tokuseki Paper Co., Ltd.) with a thickness of 170 μm, and then heated at 120 ° C. for 1 minute to solidify the aqueous resin emulsion, thereby absorbing and releasing moisture having a photocatalytic function. A resin layer was provided. 170 ° C in a heating and foaming furnace,
The foam was heated and foamed for 1 minute to obtain a moisture absorbing / releasing wall material sheet having photocatalytic activity.

[Aqueous emulsion composition]-23 parts by weight of ethylene-vinyl acetate copolymer resin-5 parts by weight of microcapsule type foaming agent ("F-85" manufactured by Matsumoto Yushi Co., Ltd.)-5 parts by weight of titanium oxide-Hindered amine radical 0.5 parts by weight of scavenger

Comparative Example 1 The same activated clay 23 as used in Example 1 was added to an aqueous emulsion having the same composition as that used in Examples 1 and 2.
A part by weight is dispersed and coated on a substrate of a backing paper having a basis weight of 150 g / m ² (manufactured by Tokushu Paper Co., Ltd.) at a thickness of 170 μm, and then heated at 120 ° C. for 1 minute to obtain the aqueous resin. The emulsion layer solidified. Thereafter, by heating at 170 ° C. for about 2 minutes, foaming of the aqueous resin emulsion layer was completed, and a wall material sheet was obtained.

[Humidity Adjustment Test] Examples 1 and 2 and Comparative Example 1
With respect to the wall material sheets of Example 1, the humidity control performance was tested by the following method and compared. The above-mentioned sheet 25cm × on the inner wall surface of an aluminum case of inner size 25cm × 25cm × 25cm
25cm, each one is stuck in an aluminum case, initial temperature and humidity are set at 20 ℃, relative humidity 50% R
H, the aluminum case was sealed, and the outside air temperature was set to 20 ° C. for 0.5 hour, 30 ° C. for 2 hours, 20 ° C.
At a cycle of 2 hours and at 10 ° C. for 2 hours,
The humidity change in the aluminum case was measured. Fig. 6 shows the measurement results.
Shown in As shown in FIG. 6, Examples 1 and 2 and Comparative Example 1
Each sheet has a humidity of 50% RH and a center of +1.
It was confirmed that the variation was small, falling between 5% RH and -12% RH.

[Evaluation of Antibacterial Performance] Each of the sheets of Examples 1 and 2 and Comparative Example 1 was cut into 25 cm ² pieces to obtain test pieces (samples), and the effect of suppressing bacteria was tested by the following method. Test strain Escherichia coli IFO 3301:
Escherichia coli) Preparation of test bacterial solution In a normal bouillon medium (manufactured by Eiken Chemical Co., Ltd.) at 35 ° C and 16 ~
The culture solution of the test bacterium cultured for 20 hours with shaking was diluted 20,000-fold with a sterile phosphate buffer to obtain a bacterial solution. The viable cell count was measured separately for the bacterial solution. Antibacterial test 1 ml of bacterial solution was dropped on the surface layer of the surface of the specimen, and the intensity of light from a mercury lamp was 0.1 m at the start of the test and in a 25 ° C atmosphere.
While irradiating the surface layer with W / cm ² , the bacteria count was measured after storage for 3 hours to determine the antibacterial performance of the sample. In addition, 1 ml of a bacterial solution was dropped on a petri dish as a control sample, and the same test was performed. Measurement of viable cell count The specimen and the control sample stored for 3 hours were washed away with 10 ml of SCDLP medium (manufactured by Nippon Pharmaceutical Co., Ltd.), and the rinsed solution was subjected to a pour plating method (35) using a standard agar medium (manufactured by Eiken Chemical Co., Ltd.). (Culture for 2 days at room temperature), and the number of viable cells was measured, and the number of cells per specimen and control sample was calculated. The detection limit in this case was 10. Table 1 shows the measurement results. It was confirmed that Examples 1 and 2 had better antibacterial and antifungal properties than Comparative Example 1.

[0055]

[Table 1]

[Evaluation of anti-mold performance] Mold resistance test (based on JIS L 1902) Each sheet of Examples 1, 2 and Comparative Example 1 was 3.0 cm ×
It was cut into 3.0 cm squares and used as test specimens. Test piece is P
The mixture was adhered to the center of a DA plate medium, and 1 ml of the mixed spore suspension was uniformly spread over the surface of the medium and the test piece, covered, and placed in a thermostat kept at a temperature of 28 ± 2 ° C., and cultured for 2 weeks.
Two weeks later, the growth state of the mold was determined based on the criteria. Table 2 shows the criteria and Table 3 shows the results.

[0057]

[Table 2]

[0058]

[Table 3]

[0059]

The interior decorative material of the present invention is characterized in that (1) a resin layer having photocatalytic activity is formed on a resin layer containing a moisture-absorbing and releasing material. Cosmetic material that has moisture, can converge the fluctuation range of humidity due to temperature changes in the outside world, and also has a high safety of moisture absorption and desorption, preventing the generation of molds and ticks of the cosmetic material itself due to moisture absorption. Is obtained.

Further, (2) a decorative material for interiors having a photocatalytic function and a moisture absorbing / releasing property, characterized in that a material having a photocatalytic activity is contained in the resin layer containing the moisture absorbing / releasing material. The same effect as the above (1) can be obtained. Further, in the present invention, since the moisture-absorbing and releasing resin layer is located on the surface,
There is an advantage that the moisture absorption / release efficiency is better than that of (1).

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one example of an interior decorative material of the present invention.

FIG. 2 is a cross-sectional view showing one example of the interior decorative material of the present invention.

FIG. 3 is a cross-sectional view illustrating an example of a moisture absorbing / releasing resin layer.

FIG. 4 is a cross-sectional view showing one example of a moisture absorbing / releasing resin layer.

FIGS. 5A to 5C are conceptual diagrams for explaining an embodiment of a photocatalyst carrier.

FIG. 6 is a graph showing the results of a humidity control test of the wall material sheet of the example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Interior decoration material 2 Decorative sheet base material 3 Moisture absorption / release resin layer 4 Photocatalytic resin layer

Claims (2)

[Claims] 1. A resin layer containing a moisture absorbing / releasing material,
An interior decorative material having a photocatalytic function and moisture absorption / release properties, wherein a resin layer having photocatalytic activity is formed. 2. An interior decoration material having a photocatalytic function and moisture absorption / release properties, characterized in that a material having photocatalytic activity is contained in a resin layer containing a moisture absorption / release material.