JPH10180943A - Decorative sheet with photocatalytic function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative sheet having photocatalytic function (antibacterial and deodorant properties) to be used for a wall surface or ceiling of a general house, hospital or hall. SOLUTION: The decorative sheet having photocatalytic function (antibacterial and deodorant properties) is obtained by laminating a foamable resin layer 1, a design layer 12, an inorganic layer 13 and a photocatalytic function layer 14 in this order on one surface of a base material 10, and embossing a surface of the function layer; The function layer is obtained by embedding part of photocatalytic particles in the surface of the layer 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a general house, a hospital,
The present invention relates to a decorative paper having a photocatalytic function (antibacterial property and deodorizing property) used for a wall or a ceiling of a hall or the like.

[0002]

2. Description of the Related Art Conventionally, decorative papers for walls and ceilings for the purpose of antibacterial and deodorizing properties include, for example, an antibacterial agent in which a metal is carried on an adsorbent on a base material and a deodorizing agent for activated carbon fine particles. Are coated with a polyvinyl chloride resin or the like, or are laminated with a film in which an antibacterial agent and a deodorant have been kneaded, but their functional effects are low for their content, and their functional effects are sustained. There are issues such as not doing. Also recently,
Photocatalyst technology that irradiates semiconductors with light to generate active oxygen and acts as an antibacterial agent and decomposes odorous substances has attracted attention.As an example of its use, photocatalyst particles are kneaded into a thermoplastic resin film, Alternatively, there is a type in which a photocatalyst functional layer is provided by coating by adding it to a thermoplastic resin liquid, etc. However, since the surface of the photocatalyst particles is coated with a resin and is not in direct contact with the outside air, it has antibacterial properties, Not only can not be sufficiently exhibited, but also when the photocatalyst particles are irradiated with light, the thermoplastic resin coating the surface of the photocatalyst particles is decomposed and destroyed by the photocatalyst particles. There is a problem that embrittlement of the layer or the thermoplastic resin film and falling off of the photocatalyst particles are caused.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a photocatalytic function and a decorative paper having a high antibacterial and deodorizing effect and a structure for maintaining the effect. The purpose is to provide.

[0004]

The decorative wallpaper having a photocatalytic function (antibacterial and deodorizing properties) of the present invention comprises a foamable resin layer, a picture layer, an inorganic layer and a photocatalytic layer on one side of a substrate. It is characterized by being laminated in order. Further, the present invention is characterized in that the surface of the outermost photocatalytic function layer is embossed.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention.
Explained based on the photocatalytic function of the present invention (antibacterial,
The decorative paper having a deodorizing property (FIG. 1) has a foamable resin layer (11), a picture layer (12), an inorganic layer (13) and a photocatalytic functional layer (14) on one side of a substrate (10). The photocatalytic functional layers are stacked in this order and embossed on the surface.

Examples of the substrate (10) include flame-retardant paper, non-combustible paper, glass fiber, non-woven fabric, woven fabric, inter-sheet reinforced paper, resin-impregnated paper, and synthetic resin films (including elastomer-imparted products). Non-combustible paper and flame-retardant paper can be preferably used for wallpaper.

[0007] The composition of the foamable resin layer (11) is such that a foaming agent, a plasticizer, a stabilizer, a flame retardant, a filler, a diluent, and the like are added to the resin component. The type of the foaming agent is not limited, and examples thereof include a capsule foaming agent and an azodicarbonamide-based organic foaming agent. As the capsule foaming agent, hollow particles of a thermoplastic resin, in which a volatile substance (for example, a volatile hydrocarbon such as isobutane) is sealed in the hollow portion,
As the thermoplastic resin forming the capsule, a vinylidene chloride-acrylonitrile copolymer or the like is used. A capsule having a particle diameter of preferably 5 to 20 μm is used. Such a capsule foaming agent foams by volatilizing a volatile substance encapsulated by heating, and produces a gas such as an organic foaming agent. No foaming.

The resin component includes a polymer mainly composed of vinyl chloride, acrylic acid, acrylate or methacrylate, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, nitro Examples thereof include cellulose derivatives such as cellulose, polyvinyl butyral, and chlorinated products of polypropylene.

When the foamable resin layer (11) is formed into an aqueous emulsion type composition, when the foamable resin layer (11) is provided on a paper base or the like, the water under the foamable resin layer (11) is applied to the paper base or the like. Acrylic resin, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, cellulose derivatives such as nitrocellulose,
It is desirable to provide a resin coat layer of polyvinyl chloride or chlorinated polypropylene.

As the resin binder of the ink constituting the picture layer (12), vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, nitrocellulose, cellulose acetobutyrate, cellulose acetate propionate, Polyvinyl butyral, chlorinated polypropylene, styrene resin, polyester resin,
Acrylic resins and the like, and those obtained by adding an isocyanate compound to these resins can be used.

The inorganic layer (13) is coated with an aqueous solution using water glass, aluminosilicate, alkali metal silicate, phosphate or the like as a binder, or a dispersion such as colloidal silica or colloidal alumina. As a curing agent, metal oxides such as magnesium oxide (MgO), zinc oxide (ZnO), aluminum oxide (Al ₂ O ₃ ), and water can be used. Oxides, magnesium silicate, strontium titanate, borate compounds and the like can be used. 0.3 to 10 μm as coating thickness
When the thickness is 10 μm or more, problems such as cracks and peeling phenomena and a decrease in transparency are liable to occur, and when it is 0.3 μm or less, the inorganic coating properties become insufficient.

As a method for forming the inorganic layer (13), in addition to a coating method and a printing method, a silicon oxide (SiO _x
x = 1 to 2), silicon oxynitride (SiO _x N _y , x = 0.
6 to 0.8, y = 0.7 to 0.9), inorganic oxides such as magnesium oxide (MgO), and aluminum oxide (Al ₂ O ₃ ), and inorganic materials such as metal oxides by a vacuum evaporation method. It can be formed by sputtering, ion plating, plasma activated chemical reaction deposition, or the like.

The above-mentioned photocatalytic functional layer having antibacterial properties and deodorizing properties
As the photocatalyst particles of (14), titanium oxide (Ti
O_Two), Zinc oxide (ZnO), iron oxide (Fe_TwoO_Three),
Oxidation indium (In)_TwoO_Three), Tin oxide (Sn
O_Two) Can be used, but in terms of raw material costs and functional effects
Titanium oxide (TiO_Two), Zinc oxide (ZnO), iron oxide
(Fe _TwoO_Three) Can be preferably used. And the photocatalyst
One of the methods for forming the functional layer (14) is a photocatalyst.
Water particles used for forming the inorganic layer (13);
Metal, aluminosilicate, alkali metal silicate, and
Aqueous solution using phosphate etc. as binder, or colloidal
Add to a dispersion of silica, colloidal alumina, etc.
To form on the inorganic layer (13). Also,
Alternatively, the inorganic layer (13) may be
In the uncured state before foaming the foamable resin layer (11) by heating,
While having sufficient flexibility and tackiness, the photocatalyst particles
Spray in powder state on the surface of uncured inorganic layer, or
Sprinkle, then heat and foam, then hot press
By adjusting the boss roll to give the uneven pattern (15)
At the same time, a part of the photocatalyst particles is embedded in the inorganic layer (13).
To be fixed.

[0014] Of the two methods, the former has sufficient antibacterial properties and deodorizing properties because the photocatalyst particles are mixed in the inorganic layer (13) and is not directly in contact with the outside air. Can not do it. On the other hand, in the latter, although a part of the photocatalyst particles is buried in the surface of the inorganic layer, most of the photocatalyst particles can sufficiently exhibit antibacterial properties and deodorizing properties because they are in direct contact with the outside air.

It is to be noted that an antibacterial zeolite, an antibacterial apatite, an antibacterial zirconia or the like, which is formed by ion-bonding any of silver, zinc and copper, zinc pyridione, thiazolyl-benzimidazole, fluorodichloromethylthio-phthalimide. If an antibacterial agent such as dimethyl-phenol-sulfamide, oxybisphenoxalidine or the like is mixed with the above-mentioned photocatalyst particles and used together, the antibacterial effect can be exerted even when no light is applied.

[0016]

EXAMPLE A foamable aqueous acrylic resin emulsion composed mainly of compound 1 was coated on one side of a flame-retardant paper having a basis weight of about 120 g / m ² (TT-120TW, manufactured by Tokushu Paper Co., Ltd.) using a coater. Coating at 120 g / m ² per minute,
After the foamable resin layer was formed, a pattern was printed on the foamable resin layer by gravure printing using an acrylic-ethylene-vinyl acetate copolymer ink (VCA manufactured by Toyo Ink Mfg. Co., Ltd.). An aqueous solution of sodium silicate is applied thereon with a coater to a thickness of 2 μm to form an inorganic layer. At an uncured stage before heating, fine powder of titanium dioxide (2
(0 μm or less: anatase type) was sprayed on the entire surface of the inorganic layer, and then heated and foamed in a drying oven at 180 ° C. for 20 seconds. Thereafter, embossing was performed on the inorganic layer side using empostrol so that the fine powder of titanium dioxide was not embedded in the inorganic layer, and a decorative paper according to the present invention was obtained. Formulation 1 (emulsion type) LXS-134 100 parts by weight Acrylic resin
(Kuraray Co., Ltd.) ・ B-703 100 parts by weight Aluminum hydroxide
(Nippon Light Metal) ・ Expancel 054 10 parts by weight Capsule foaming agent (Nippon Ferrite)

<Results of Example> The antibacterial performance of the decorative paper having the photocatalytic function (antibacterial property and deodorizing property) in Example 1 was subjected to a light irradiation test for 2 hours at an ultraviolet irradiation amount of 8 μW / 1 cm ² . In the following, favorable results were obtained in antibacterial properties. Start The relevant sheet Blank sheet Escherichia coli 3 × 10 ⁵ <1 4.2 × 10 ⁵ Mutant bacteria 2.6 × 10 ⁵ <1 1.8 × 10 ⁵ <1 detection limit or less

[0018]

The decorative paper having a photocatalytic function of the present invention is
Even home fluorescent lamps can exert both antibacterial properties against Escherichia coli and the like and deodorizing properties against ammonia, acetaldehyde and the like when irradiated for a long time. Further, the decorative paper of the present invention, the photocatalyst functional layer is formed in a state in which a part of the photocatalyst particles are firmly held in the inorganic layer without falling off, and most of the photocatalyst particles are in contact with the outside air. The antibacterial and deodorizing effects can be maintained and excellently exhibited.

[0019]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a decorative paper having a photocatalytic function.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Base material 11 ... Foamable resin layer 12 ... Picture layer 13 ... Inorganic layer 14 ... Photocatalytic function layer 15 ... Emboss pattern

Claims (2)

[Claims] 1. A decorative paper having a photocatalytic function, wherein a foamable resin layer, a picture layer, an inorganic layer and a photocatalytic function layer are laminated on one surface of a substrate in this order. 2. The decorative paper having a photocatalytic function according to claim 1, wherein the outermost photocatalytic functional layer has an embossed surface.