JP3996682B2 - Decorative sheet having organic substance decomposing function and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a decorative sheet used for manufacturing interior materials or exterior materials of buildings, and manufacturing surface materials such as furniture, housing equipment, and home appliances, and a manufacturing method thereof.
[0002]
[Prior art]
Organic materials such as various odors and dirt generated by humans in their living spaces are adsorbed or adhered to the interior and exterior surfaces of buildings or furniture, and the surfaces of the surfaces deteriorate in appearance over time. And it leads to an unfavorable condition for hygiene. In order to prevent this, conventionally, an absorbent that absorbs components of odor and dirt, a decomposing agent that decomposes the absorbent, and the like are applied to the surface of the decorative sheet or dispersed in the decorative sheet. However, in order to obtain appropriate results by these methods, a large amount of absorbent or decomposition agent is required, and when this is disposed on a decorative sheet, the decorative sheet cannot have the necessary surface properties. There is.
[0003]
[Problems to be solved by the invention]
The object of the present invention is to decompose odors, molds and fungi adhering to the surface without using the above-mentioned absorbents and decomposition agents, and thus without damaging the surface physical properties, and to provide a clean surface in terms of appearance and hygiene. It is in providing the decorative sheet to hold | maintain.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the basic concept of the present invention is to dispose a photocatalytically active substance that exhibits photocatalytic activity upon UV irradiation and decomposes organic substances on the surface layer of a decorative sheet. Therefore, the decorative sheet according to the present invention basically includes a printed layer on a substrate, a decomposition functional layer containing a photocatalytically active substance that decomposes organic matter, and the printed layer of the photocatalytically active substance disposed between both layers. And a blocking layer that blocks the action on the.
[0005]
The decomposition functional layer is made of a film containing titanium oxide, and this film can be formed from a water-dispersed sol solution containing anatase-type titanium oxide ultrafine particles by a sol-gel method. The decomposition functional 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 of anatase-type titanium oxide ultrafine particles and hydrolyzable organoalkoxysilane by a sol-gel method. be able to.
[0006]
Next, the barrier layer is made of silicon oxide gel or porous alumina. Instead, the blocking layer is composed of an organic-inorganic composite obtained by mixing and reacting an organic monomer and an alkoxide of titanium or silicon.
[0007]
An organic polymer coating layer is provided between the printed layer and the blocking layer for the purpose of reinforcing the surface properties of the decorative sheet. This organic polymer coating layer is made of a thermosetting resin or a radiation curable resin.
[0008]
The method for producing a decorative sheet according to the present invention includes providing a printing layer on a substrate, providing a blocking layer on the printing layer, and providing a decomposition functional layer on the blocking layer. Furthermore, in the method for producing a decorative sheet according to the present invention, in order to reinforce the surface properties, an organic polymer coating layer is provided on the printing layer, and then the blocking layer is provided on the organic polymer coating layer. Providing the decomposition functional layer on the barrier layer.
[0009]
【The invention's effect】
According to the present invention, by providing a decomposition functional layer containing a photocatalytically active substance that decomposes organic matter as the surface layer of the decorative sheet, the photocatalytically active substance is adsorbed or adhered to the surface of the decorative material, such as organic matter such as dirt. And the appearance and hygiene of the cosmetic material can be kept clean.
[0010]
[Embodiment]
As shown in FIG. 1, the decorative sheet 10 according to the present invention is generally composed of a base 12 and a solid printing layer 14 a and a pattern layer 14 b which are sequentially printed on the base 12 using an ink containing an organic binder. A printing layer 14 comprising: an organic polymer coating layer 16 for reinforcing the surface physical properties of the decorative sheet; a decomposition layer 18 containing a photocatalytically active substance that decomposes organic matter, which is a surface layer; and the coating layer and the decomposition And a blocking layer 20 disposed between the functional layer and blocking the action of the photocatalytically active substance on the organic coating layer and the printing layer.
[0011]
The base material 12 is a thin paper generally used for decorative paper, an impregnated paper impregnated with latex or other resin, a self-supporting plastic film such as vinyl chloride, a vapor deposition film, or a metal foil such as an aluminum foil. Any of non-woven fabric and synthetic paper may be used.
[0012]
The decomposition functional layer 18 is made of a film containing titanium oxide, and this film is formed by a sol-gel method from an aqueous dispersion sol liquid containing anatase-type titanium oxide ultrafine particles for photocatalyst having an average particle diameter of 0.001 to 0.5 μm. A thin film of .005 to 3 μm.
[0013]
As another example, the decomposition functional layer 18 is made of a film containing a mixture of titanium oxide and silicon oxide. Can be formed. In this case, titanium oxide is dispersed and mixed in water together with a hydrolyzable organoalkoxysilane serving as a binder, applied using a roll coater, gravure coater or knife coater, dried, heated and aged, and titanium oxide and silicon oxide. A thin film is formed. The proportion of titanium oxide contained in the decomposition functional layer 18 is preferably 30% or more with respect to silicon oxide. A hydrophilic organic solvent can be appropriately mixed with the aqueous dispersion.
[0014]
The blocking layer 20 provided for protecting the organic polymer coating layer or the printing layer between the organic polymer coating layer 16 and the decomposition functional layer 18 or between the printing layer 14 and the decomposition functional layer 18 is made of titanium oxide. Since the decomposition action mainly acts on the organic compound, it is preferably made of an inorganic compound. Therefore, the blocking layer 20 is made of silicon oxide gel or porous alumina.
[0015]
However, inorganic-organic composites obtained by reaction of titanium or silicon alkoxides with organic monomers can be advantageously used because the physical properties of the organic polymers improve the performance of the film. Therefore, the blocking layer 20 is composed of an organic-inorganic composite obtained by mixing and reacting an organic monomer and an alkoxide of titanium or silicon.
[0016]
The blocking layer 20 can also be formed in the same manner as the decomposition functional layer 18 from an aqueous dispersion of hydrolyzable organoalkoxysilane or from a mixed dispersion of hydrolyzable organoalkoxysilane and an organic monomer.
[0017]
The organic polymer coating layer 16 between the printing layer 14 and the blocking layer 20 is made of a thermosetting resin such as phenol, urea, melamine, epoxy, polyester, polyurethane, etc., as well as a radiation curable resin. Such a material is usually used as a top coat layer of a decorative sheet.
[0018]
The solid printing layer 14 a of the printing layer 14 can be omitted depending on the surface state of the substrate 12. Similarly, the organic polymer coating layer 16 for enhancing the surface physical properties of the decorative sheet 10 can also be omitted depending on the use of the decorative sheet.
[0021]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a part of a decorative sheet according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Decorative sheet 12 Base material 14 Print layer 16 Organic polymer coating layer 18 Decomposition functional layer 20 Barrier layer

Claims (9)

  Including a printed layer on a substrate, a decomposition functional layer containing a photocatalytically active substance that decomposes organic matter, and a blocking layer that is disposed between both layers and blocks the action of the photocatalytically active substance on the printed layer. The layer is a decorative sheet made of an organic-inorganic composite obtained by mixing and reacting an organic monomer and an alkoxide of titanium or silicon.   The decorative sheet according to claim 1, wherein the decomposition functional layer is made of a film containing titanium oxide.   The decorative sheet according to claim 2, wherein the coating is formed from an aqueous dispersion sol containing anatase-type titanium oxide ultrafine particles by a sol-gel method.   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.   The decorative sheet according to claim 4, wherein the coating is formed from an anatase-type titanium oxide ultrafine particle and a hydrolyzable organoalkoxysilane aqueous dispersion sol by a sol-gel method.   The decorative sheet according to claim 1, comprising an organic polymer coat layer disposed between the printed layer and the blocking layer.   The decorative sheet according to claim 6, wherein the organic polymer coating layer is made of a thermosetting resin or a radiation curable resin.   A printing layer is provided on the substrate, and a blocking layer comprising an organic-inorganic composite obtained by mixing and reacting an organic monomer and an alkoxide of titanium or silicon is provided on the printing layer, A method for producing a decorative sheet, comprising providing a decomposition functional layer on a barrier layer.   Obtained by providing a printing layer on a substrate, providing an organic high-coating layer on the printing layer, and mixing and reacting an organic monomer and an alkoxide of titanium or silicon as a blocking layer on the coating layer. A method for producing a decorative sheet, comprising: providing a barrier layer made of an organic-inorganic composite, and providing a decomposition functional layer on the barrier layer.

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