JPH11115093A - Decorative sheet with organic substance decomposing function and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decompose smell, mold, and a germ adhered on the surface without impairing a physical property of the surface by disposing a photocatalyst active substance showing photocatalystic activity and decomposing an organic substance through irradiation of UV rays on the surface layer of a decorative sheet. SOLUTION: The decorative sheet 10 includes a base material 12, a print layer 14, an organic giant molecular coat layer 16 for reinforcing a physical property of the surface of the decorative sheet, a decomposite function layer 18 being a surface layer containing a photocatalystic active substance for decomposing an organic substance, and an insulation layer 20 interposed between the coat layer and the decomposite function layer and insulating an effect to the organic layer of a photocatalystic active substance and the print layer. The decomposite function layer 18 consists of a film containing titanium oxide, and is a film formed of water dispersive sol liquid containing photocatalyst anatase-type titanium oxide ultra-minute grains by a sol gel method. Since the insulation layer 20 is preferably made up of an inorganic compound since an decomposlte effect of the titanium oxide acts mainly to an organic compound. Thus, the insulation layer 20 is composed of a silicon dioxide gel or porous alumina.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet used for producing interior or exterior materials for buildings and for producing surface materials for furniture, housing equipment, home electric appliances and the like, and a method for producing the same.

[0002]

2. Description of the Related Art Various odors generated by humans in their living spaces are present on the interior and exterior surfaces of buildings or surfaces of furniture.
Organic substances such as dirt are adsorbed or adhered, and the surface thereof loses its appearance with the passage of time and causes an unfavorable state of hygiene. In order to prevent this, conventionally, an absorbent that absorbs odor and dirt components, a decomposing agent that decomposes the components, and the like have been applied to the surface of the decorative sheet or dispersed in the decorative sheet. However, in order to obtain a suitable result by these methods, a large amount of an absorbent or a decomposer is required. There is.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to decompose odors, molds and fungi adhering to a surface without using the above-mentioned absorbents and decomposers and therefore without impairing the surface properties. Another object of the present invention is to provide a decorative sheet which has a clean, hygienic and hygienic surface.

[0004]

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention basically comprises disposing a photocatalytically active substance which exhibits photocatalytic activity and decomposes organic substances upon irradiation of ultraviolet rays on a surface layer of a decorative sheet. It is a concept. Therefore, the decorative sheet according to the present invention is basically provided with a printing layer on a substrate, a decomposition functional layer containing a photocatalytically active substance that decomposes organic substances, and a printed layer of the photocatalytically active substance disposed between both layers. And a blocking layer that blocks the action on the surface.

[0005] The decomposition functional layer is composed of a coating containing titanium oxide, and this coating can be formed by a sol-gel method from an aqueous dispersion sol solution containing anatase type titanium oxide ultrafine particles. Further, the decomposition function layer is formed of a film containing a mixture of titanium oxide and silicon oxide, and this film is formed from a water-dispersed sol solution of anatase type titanium oxide ultrafine particles and a hydrolyzable organoalkoxysilane by a sol-gel method. be able to.

Next, the barrier layer is made of silicon oxide gel or porous alumina. Alternatively, the barrier layer may be formed of an organic-inorganic composite obtained by mixing and reacting an organic monomer and an alkoxide of titanium or silicon.

An organic polymer coat layer is provided between the printing layer and the blocking layer for the purpose of reinforcing the surface properties of the decorative sheet. This organic polymer coat layer is made of a thermosetting resin or a radiation-curable resin.

The method for producing a decorative sheet according to the present invention comprises:
Providing a printing layer on a base material, providing a blocking layer on the printing layer, and providing a decomposition functional layer on the blocking layer. Further, the method for producing a decorative sheet according to the present invention, for reinforcing surface properties, providing an organic polymer coat layer on the print layer,
Thereafter, providing the barrier layer on the organic polymer coat layer and finally providing the decomposition functional layer on the barrier layer.

[0009]

According to the present invention, the surface of the decorative sheet is provided with a decomposition functional layer containing a photocatalytic active substance that decomposes organic substances, so that the photocatalytic active substance has an organic substance such as odor and dirt on the surface of the decorative material. Can be prevented from being adsorbed or adhered, and the appearance and hygiene of the cosmetic material can be kept clean.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a decorative sheet 10 according to the present invention comprises a base material 12 and a solid printing layer sequentially printed on the base material 12 using an ink containing an organic binder. 14a and a printing layer 14 comprising a picture layer 14b;
An organic polymer coat layer 16 for reinforcing the surface properties of the decorative sheet, a decomposition function layer 18 containing a photocatalytic active substance that decomposes organic substances, which is a surface layer, and disposed between the coat layer and the decomposition function layer A blocking layer 20 for blocking the action of the photocatalytically active substance on the organic coating layer and the printing layer.

The base material 12 may be a thin paper, an impregnated paper impregnated with latex or other resin, a self-supporting plastic film such as vinyl chloride, a vapor-deposited film, an aluminum foil, which is generally used for decorative paper. Any of metal foil, nonwoven fabric and synthetic paper may be used.

The decomposition functional layer 18 is composed of a coating containing titanium oxide, and the coating has an average particle size of 0.001 to 0.5 μm.
m formed by a sol-gel method from a water-dispersed sol solution containing anatase-type titanium oxide ultrafine particles for photocatalyst
It is a thin film of 5 to 3 μm.

As another example, the decomposition functional layer 18 is composed of a coating containing a mixture of titanium oxide and silicon oxide, and this coating is formed from a water dispersion sol of ultrafine anatase type titanium oxide and hydrolyzable organoalkoxysilane. -It can be formed by a gel method. In this case, the titanium oxide is
Disperse and mix in water with the hydrolyzable organoalkoxysilane as a binder, apply using a roll coater, gravure coater or knife coater, and dry,
Heat aging to form a thin film composed of titanium oxide and silicon oxide. The ratio of titanium oxide contained in the decomposition functional layer 18 is preferably 30% or more based on silicon oxide. A hydrophilic organic solvent can be appropriately mixed with the aqueous dispersion.

Organic polymer coating layer 16 and decomposition functional layer 18
Or between the print layer 14 and the decomposition functional layer 18, the barrier layer 20 provided for protecting the organic polymer coat layer or the print layer is formed because the decomposition action of titanium oxide mainly acts on the organic compound. And an inorganic compound. Therefore, the blocking layer 20 is made of silicon oxide gel or porous alumina.

However, an inorganic-organic composite obtained by reacting an alkoxide of titanium or silicon with an organic monomer can be advantageously used because the properties of the organic polymer improve the performance of the film. Therefore, the blocking layer 20 is formed of an organic-inorganic composite obtained by mixing and reacting an organic monomer and an alkoxide of titanium or silicon.

The blocking layer 20 can be formed from an aqueous dispersion of a hydrolyzable organoalkoxysilane or from a mixed dispersion of a hydrolyzable organoalkoxysilane and an organic monomer in the same manner as the decomposition functional layer 18. .

The organic polymer coating layer 16 between the printing layer 14 and the blocking layer 20 is made of a thermosetting resin such as a phenol-based, urea-based, melamine-based, epoxy-based, polyester-based, or polyurethane-based resin, or a radiation-curable resin. It consists of a material usually used as a top coat layer of a decorative sheet, such as a mold resin.

The solid printing layer 14a of the printing layer 14 is
It can be omitted depending on the surface condition of the substrate 12. Similarly, the organic polymer coat layer 16 for improving the surface properties of the decorative sheet 10 can be omitted depending on the use of the decorative sheet.

[0019]

EXAMPLE A solid printing layer 14a and a picture layer 14b were printed on a substrate 12 using a printing ink containing 60 g / latex impregnated paper as a substrate 12 and a polyvinyl chloride-vinyl acetate copolymer as a binder. Thus, a printing layer 14 was provided. Then 2
The liquid-curable urethane was applied on the pattern layer 14b by a gravure printing machine so that the solid content became 6 g /, and the organic polymer coat layer 16 was provided. Next, an organoalkoxysilane-based coating agent was applied on this coat layer by using SiO 2 .Al 2 O 3.
Was coated with a gravure printer so that the solid content of the coating containing 6 g / g was 6 g /. Then, the barrier layer 20
On top of this, 100 parts of a hydrolyzable organoalkoxysilane-based coating agent was added with 40 parts of anatase-type titanium oxide ultrafine particles, applied by a gravure printing machine such that the solid content became 0.1 g /, and decomposed. The functional layer 18 was provided.

The decorative sheet 10 obtained in this way is 5 × 1
Into a 120 ml glass bottle, acetaldehyde is injected until the gas concentration in the bottle becomes 1000 ppm, and UV light having a wavelength of 350 nm is applied from outside the bottle to 4.0.
After irradiation at 1 to 4.4 mW / cm2 for 1 hour, the air in the bottle was analyzed by gas chromatography. As a result, the acetaldehyde concentration in the bottle was 0 ppm.

[0021]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of a decorative sheet according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Decorative sheet 12 Base material 14 Printing layer 16 Organic polymer coating layer 18 Decomposition function layer 20 Shielding layer

Claims (12)

[Claims] 1. A printing layer on a base material, a decomposition functional layer containing a photocatalytically active substance that decomposes organic substances,
A blocking layer for blocking the action of the photocatalytically active substance on the printing layer. 2. The decorative sheet according to claim 1, wherein the decomposition functional layer comprises a coating containing titanium oxide. 3. The decorative sheet according to claim 2, wherein the coating is formed by a sol-gel method from an aqueous dispersion sol containing ultrafine anatase-type titanium oxide particles. 4. The decorative sheet according to claim 1, wherein the decomposition functional layer is formed of a film containing a mixture of titanium oxide and silicon oxide. 5. The decorative sheet according to claim 4, wherein the coating is formed by a sol-gel method from an aqueous dispersion sol of anatase type titanium oxide ultrafine particles and a hydrolyzable organoalkoxysilane. 6. The decorative sheet according to claim 1, wherein the barrier layer is made of a silicon oxide gel. 7. The barrier layer comprises porous alumina,
The decorative sheet according to claim 1. 8. The decorative sheet according to claim 1, wherein the barrier layer is made of an organic-inorganic composite obtained by mixing and reacting an organic monomer and an alkoxide of titanium or silicon. 9. The decorative sheet according to claim 1, further comprising an organic polymer coat layer disposed between the printing layer and the barrier layer. 10. The decorative sheet according to claim 9, wherein the organic polymer coat layer is made of a thermosetting resin or a radiation-curable resin. 11. A method for producing a decorative sheet, comprising: providing a printing layer on a base material, providing a blocking layer on the printing layer, and providing a decomposition functional layer on the blocking layer. 12. A method comprising providing a printing layer on a base material, providing an organic coating layer on the printing layer, providing a blocking layer on the coating layer, and providing a decomposition functional layer on the blocking layer. , A method of manufacturing a decorative sheet.