JP2002206073A - Water-base coating for wallpaper and wallpaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new photocatalyst-containing water-base coating having not only excellent protective functions for an interior finishing member or deodorizing or antimicrobial performances but also excellent decorativeness, degree of whiteness, texture and beautiful appearance and to provide a wallpaper provided with a coating layer comprising the coating. SOLUTION: This water-base coating for wallpaper contains a fibrous monoclinic titanium dioxide, a reactive silicone compound and polyvinyl alcohol as active components. The wallpaper is prepared by forming the coating layer comprising the water-based coating for wallpaper on a sheetlike or a filmlike substrate for wallpaper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water-based paint for wallpaper and a wallpaper.

[0002]

2. Description of the Related Art As the improvement of the housing environment has progressed remarkably,
With the enforcement of the Housing Quality Assurance Promotion Law, there is a strong demand for extending the life of buildings and, in turn, extending the life of interior components. In particular, in a recent house model, it is not easy to maintain and maintain the atrium space from the entrance portion and the wall surface of the large space portion of the living room and dining area at the initial construction quality. BACKGROUND ART Wallpapers provided with a coating layer made of a paint containing a photocatalyst such as titanium dioxide have been proposed for the purpose of protecting interior members of buildings. Such wallpaper not only protects the interior components and contributes to a longer life, but the photocatalyst also exhibits the antibacterial and deodorizing properties that are effective even with indoor fluorescent lamps and incandescent lamps. It is also effective for environmental purification.

Heretofore, as a photocatalyst-containing wallpaper paint, those containing a photocatalyst, an inorganic binder, an inorganic filler, and an organic binder such as a synthetic resin have been proposed. More specifically, for example, in Japanese Patent Application Laid-Open No. 10-183023,
Copolymer emulsions obtained by emulsion polymerization of carbonyl group-containing α, β-ethylenically unsaturated monomers such as diacetone (meth) acrylamide and, if necessary, other ethylenically unsaturated monomers, adipic dihydrazide, succinic acid Dihydrazide, citric trihydrazide,
A photocatalyst-containing paint containing a hydrazine derivative such as naphthoic acid tetrahydrazide, a pigment component such as activated alumina, activated clay and zeolite and a photocatalyst such as titanium dioxide is described.

JP-A-10-180943 discloses a paint containing a photocatalyst containing a photocatalyst such as titanium dioxide and a binder such as water glass, aluminosilicate, alkali metal silicate, phosphate, colloidal silica and colloidal alumina. Has been described. JP-A-10-251565 discloses a photocatalyst such as titanium dioxide, a carboxy group-containing polymerizable unsaturated monomer such as (meth) acrylic acid, maleic acid, and maleic anhydride, and methyl (meth) acrylate.
Photocatalyst-containing coatings containing copolymers with other polymerizable unsaturated monomers such as ethyl (meth) acrylate and styrene are described.

JP-A-10-264283 discloses a photocatalyst such as titanium dioxide, a thermoplastic resin (an acrylic resin,
Aqueous emulsions of styrene-acrylic copolymers, styrene-butadiene copolymers, ethylene-vinyl acetate copolymers, etc., film-forming inorganic substances (colloidal silica, colloidal alumina, saponite, hectorite, kaolinite, sepiolite, etc.), A photocatalyst-containing coating containing a binder such as a colloidal silica composite thermoplastic polymer emulsion is described.

[0006] Japanese Patent Application Laid-Open No. H11-138686 discloses that
Kinds of photocatalyst-containing paints are described, one containing a metal oxide sol and a titanium oxide sol, and the other containing a silica sol, a monoalkyltrimethoxysilane or a hydrolysis product thereof and a titanium oxide sol. It contains.

JP-A-11-279446 discloses inorganic binders such as colloidal silica, alumina sol, saponite, hectorite and sepiolite, photocatalysts such as titanium dioxide, polyvinyl alcohol, and organic binders such as aqueous latex and aqueous emulsion. A photocatalyst-containing paint containing is described.

[0008]

The above-mentioned conventional photocatalyst-containing wallpaper paints mainly contain powdered titanium dioxide, and certainly have an excellent effect on the functional aspects of deodorization and antibacterial. Can demonstrate. However, while the wallpaper is used for the purpose of decorating the interior as well as the protection of the interior members, the wallpaper formed with the coating layer made of a photocatalyst-containing paint such as conventional titanium dioxide has poor decorativeness and high quality. Lack of texture and beauty. Further, the coating layer made of the conventional photocatalyst-containing coating also has the disadvantage that the whiteness is somewhat low, and the whiteness is further reduced over a long period of time.

In addition, these conventional photocatalyst-containing paints such as titanium dioxide cannot form a deep and beautiful embossed pattern when applied to a polyolefin-based wallpaper base material. WO 98/43733 describes a photocatalyst-containing wallpaper paint comprising monoclinic titanium dioxide fiber and a condensate of tetraethylorthosilicate (Example 5). However, with this paint, a deep embossed pattern cannot be formed on the surface of the coating layer. The international publication teaches that a combination of fibrous monoclinic titanium dioxide and what kind of component is excellent in decorativeness and that a particularly deep embossed pattern can be formed on the surface of the coating layer. Absent.

It is an object of the present invention to provide a novel photocatalyst-containing water-based paint having not only a protective function or deodorization and antibacterial performance of an interior member, but also excellent decorativeness, whiteness, texture and aesthetic appearance.

[0011]

SUMMARY OF THE INVENTION The present invention relates to an aqueous paint for wallpaper containing fibrous monoclinic titanium dioxide, a reactive silicone compound and polyvinyl alcohol as active ingredients.
The present invention also provides a sheet or film-like base material for wallpaper,
According to the present invention, there is provided a wallpaper provided with a coating layer made of the above-mentioned aqueous paint for wallpaper.

The coating layer of the water-based paint for wallpaper according to the present invention has a protective function, deodorizing property, antibacterial property and decomposing property of organic stains of the interior member which is equal to or higher than that of the conventional coating layer containing a photocatalyst-containing paint. In addition, it has excellent decorative properties such that a very good embossed pattern is formed on its surface, has high whiteness, and has a very small decrease in whiteness even after long-term storage, and has a high-quality texture.

The photocatalyst-containing paint of the present invention can form a deep and beautiful embossed pattern even when applied to a polyolefin-based wallpaper equipment.

As described above, prior to the application of the present invention, a specific fibrous monoclinic titanium dioxide is used as a photocatalytic component, a reactive silicone compound is used as a binder for the photocatalytic component, and the effect of further enhancing the embossed pattern forming effect is obtained. There is no paint for wallpaper containing polyvinyl alcohol at all, and it was not expected at all to exhibit the above-mentioned excellent effects.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The aqueous paint for wallpaper of the present invention contains, as essential components, fibrous monoclinic titanium dioxide, a reactive silicone compound and polyvinyl alcohol, and an appropriate amount of these components is dispersed in water. It is a thing.

The fibrous monoclinic titanium dioxide is a known fibrous titanium dioxide, for example, International Publication WO 98/4.
No. 3733 and the like. Monoclinic titanium dioxide has the advantages of not requiring a fine-graining step using a sand mill or the like in the production process of paint, having low cohesiveness, being adaptable to a rotary screen, and being capable of forming a printed pattern.

The size of the fibrous monoclinic titanium dioxide is not particularly limited, but is usually about 0.01 to 1 μm, preferably about 0.05 to 0.5 μm, and about 0.5 to 100 μm in average fiber length. Degree, preferably about 3 to 50 μm, aspect ratio (average fiber length / average fiber diameter) of 5 or more,
Preferably, 10 or more should be used.

The blending amount of the fibrous monoclinic titanium dioxide is not particularly limited, and may be appropriately selected from a wide range according to various conditions such as the size, type and blending amount of other components. That the embossed pattern formed on the surface of the coating layer has a clearer depth, and that the whiteness of the coating layer is good,
In consideration of preventing the occurrence of cracks in the coating layer, the amount is usually 3 to 30% by weight, preferably 5 to 20% by weight of the total amount of the water-based paint of the present invention.

In the present invention, the reactive silicone compound is mainly used as a binder. The reactive silicone compound is not particularly limited as long as it is a silicone resin capable of forming a rubber-like elastic film, and any known one can be used. Among them, hydroxylated polydiorganosiloxane is preferable. The organic group contained in the hydroxylated polydiorganosiloxane is not particularly limited, but an aliphatic or aromatic monovalent hydrocarbon group having 7 or less carbon atoms is generally used. Specific examples of the monovalent hydrocarbon group having 7 or less carbon atoms include methyl, ethyl, butyl, hexyl, and phenyl. Preferred hydroxylated polydiorganosiloxanes are those in which at least 50% of the total number of organic groups in the molecule are methyl groups.
There is no restriction on the weight-average molecular weight (hereinafter referred to as "Mw") of the hydroxylated polydiorganosiloxane, but consideration is given to obtaining an elastic film having tensile strength and elongation at break, good emulsion stability, etc. Then, Mw is usually 5000 or more, preferably 30,000 to 1,000.
What is necessary is to use the thing of about 000. As the reactive silicone compound, one type can be used alone, or two or more types can be used in combination.

The reactive silicone compound is preferably used in the form of an emulsion. The emulsion of the reactive silicone compound can be obtained according to a known method by adding an emulsifier to the monomer of the reactive silicone compound and performing emulsion polymerization, or adding an emulsifier to the reactive silicone compound. As the emulsifier, one or more of an anionic surfactant, a nonionic surfactant, a cationic surfactant and the like can be appropriately selected and used. The amount of the emulsifier to be added is not particularly limited, and may be appropriately selected from a wide range according to the properties and the like required for the emulsion to be obtained. In order to obtain it, the amount is usually about 1 to 5% by weight, preferably about 2 to 3% by weight based on the emulsification reaction system.

The amount of the reactive silicone compound is not particularly limited, and may vary from a wide range according to various conditions such as the type of the reactive silicone compound, the type and the amount of the other components, and the performance required for the obtained water-based paint. Although it can be selected as appropriate, it is possible to make the fibrous monoclinic titanium dioxide sufficiently exhibit a photocatalytic function, to form a coating layer having good water resistance, fixing property of the fibrous monoclinic titanium dioxide and fastness to wet friction. In consideration of the above, the amount may be 3 to 30% by weight (solid content), preferably 5 to 20% by weight based on the total amount of the water-based paint of the invention.

In the present invention, in order to make the elastic film made of the reactive silicone compound tougher, one or two of colloidal silica, a cross-linking agent, a curing catalyst and the like are added to the reactive silicone compound or its emulsion. Seeds or more may be added. 0.001 to 0.05 μm as colloidal silica
Aqueous colloidal silica stabilized with sodium ions or the like having a particle size of m is exemplified, and examples of the cross-linking agent include alkoxysilane and methyl hydrogen polysiloxane. Examples of the curing catalyst include metal fatty acid salts represented by dialkyltin diacylate that do not adversely affect the reactive silicone compound such as depolymerization and the like, organic peroxides, inorganic peroxides, and the like.

Polyvinyl alcohol, which is another essential component of the water-based paint of the present invention, mainly has an effect of further enhancing the effect of forming an embossed pattern exhibited by fibrous monoclinic titanium dioxide. Among these polyvinyl alcohols, those having a saponification degree of 70 to 100% are preferred. The blending amount of polyvinyl alcohol can also be appropriately selected from a wide range according to various conditions such as the type and blending amount of other components and the performance required for the obtained coating composition, but the water resistance, particularly the wet friction fastness, is high. In order to obtain a coating layer having good film-forming properties and embossed pattern-forming properties, the amount may be 0.5 to 5% by weight (solid content), preferably 1 to 3% by weight, based on the total amount of the aqueous coating composition of the present invention.

In order to further improve the preferable properties of the water-based paint for wallpaper of the present invention, one or two kinds of high-melting polyethylene wax emulsions, thickeners, nonionic surfactants, defoamers and the like are used. The above can be blended.

The high melting point polyethylene wax emulsion mainly contributes to improving the dry rub fastness of the coating layer formed by the aqueous coating composition of the present invention. Another advantage is that the photocatalytic function of the fibrous monoclinic titanium dioxide is not impaired. The high melting point polyethylene wax is not particularly limited, and an ethylene polymer having a melting point of at least 100 ° C. and a weight average molecular weight of about 500 to 10,000 can be emulsified and used. Various commercially available high melting point polyethylene waxes can also be used. For example, Mitsui High Wax (manufactured by Mitsui Chemicals), Dialen 30 (manufactured by Mitsubishi Chemical), Nisseki Rexpora (manufactured by Nisseki Mitsubishi), sun wax ( Sanyo Chemical), Polylet (China Essential Oil), Neowax (Yashara Chemical), AC Polyethylene (Allied Signal), Epolen (Eastman Chemical), Hoechst Wax (Clariant), A-Wax (Manufactured by BASF), polywax (manufactured by Petrolato), trade name: Escomer (manufactured by Exxon Chemical), and the like. One kind of high melting point polyethylene wax can be used alone, or two or more kinds can be used in combination. The blending amount of the high melting point polyethylene wax emulsion may be about 0.5 to 3% by weight, preferably about 1 to 2% by weight, based on the total amount of the coating composition of the present invention.

[0026] Thickeners are suitable for improving the coating properties of the aqueous paints of the present invention. Known thickeners can be used, for example, polymerized oils such as highly polymerized linseed oil, hydrogenated castor oil, metal soaps (particularly, soaps such as aluminum, lead, rare earth, calcium, and zinc), Examples thereof include dimer acids, polyethylenes other than high-melting-point polyethylene wax, inorganic thickeners (bentonite, silica, etc.), alginic acids, cellulose derivatives, and alkali salts of polyacrylates and polymethacrylates. As the thickener, one type can be used alone, or two or more types can be used in combination. The compounding amount of the thickener is not particularly limited, and an amount capable of exerting its function may be appropriately selected according to the type and the compounding amount of the other components. Usually, 3% by weight of the total amount of the water-based paint of the present invention is used.
Or less, preferably about 0.5 to 2% by weight.

The nonionic surfactant is effective in improving the wettability of the fibrous monoclinic titanium dioxide. Known nonionic surfactants can be used, for example, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, alkylaryl formaldehyde condensed polyoxyethylene ether, polyoxyethylene polyoxypropylene block copolymer, polyoxyethylene Ether type such as polyoxypropyl alkyl ether, polyoxyethylene ether of glycerin ester, polyoxyethylene ether of sorbitan ester, ether ester such as polyoxyethylene ether of sorbitol ester, polyethylene glycol fatty acid ester, glycerin ester, polyglycerin ester, Esters such as sorbitan esters, propylene glycol esters, and sucrose esters;
Examples include nitrogen-containing surfactants such as fatty acid alkanolamides, polyoxyethylene fatty acid amides, and polyoxyethylene alkylamines. One type of nonionic surfactant can be used alone, or two or more types can be used in combination.
The amount of the nonionic surfactant is not particularly limited, and an amount capable of exerting its function may be appropriately selected according to the type and the amount of the other components. %, Preferably about 0.5 to 2% by weight.

The antifoaming agent improves the foam removability of the water-based paint of the present invention. Known defoaming agents can be used, and examples thereof include a surfactant having a low HLB, an alcohol having up to about 6 to 10 carbon atoms, pine oil, and silicone.

The water-based paint for wallpaper of the present invention may contain one or more kinds of additives conventionally known for paints as long as the preferable properties are not impaired. As the additives, for example, conventional organic binders and inorganic binders, photocatalysts other than titanium dioxide used in the present invention, anti-floating agents, anti-separation agents, gas-checking inhibitors, emulsifiers, wetting agents, dispersants, pH adjusters, inorganic pigments, organic pigments, film-forming aids, antifreeze materials, flame retardants, ultraviolet absorbers, antistatic agents, anticorrosives, fungicides, bactericides, antibacterials, antiseptics, etc. it can.

The water-based paint for wallpaper of the present invention can be produced by mixing appropriate amounts of water, the above three essential components, and other components as necessary using a general stirrer or the like.

As the wallpaper base material, any of known ones can be used. For example, natural pulp paper such as high quality paper, glassine paper, tracing paper, Japanese paper, cast paper, coated paper, impregnated paper, laminated paper, non-woven fabric, Fabrics, knits, polyvinyl chloride, polyethylene terephthalate, polymethyl methacrylate, polycarbonate, polyolefins (polyethylene, polypropylene, polyisoprene,
Polybutene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, olefinic thermoplastic elastomer, etc.), modified polystyrene, impact-resistant polystyrene,
Sheet, gypsum board, made of synthetic resin such as ABS resin
Plywood, particle board and the like can be mentioned. A laminate of one or two of these may be used as a wallpaper substrate.

These sheets or boards for wallpaper base materials may be added, if necessary, for example, to powdered inorganic fillers, plasticizers, foaming agents, stabilizers, lubricants, pigments, antioxidants, ultraviolet absorbers, One or more known additives such as a fuel may be contained. As the powdered inorganic filler, for example, aluminum hydroxide, magnesium hydroxide, barium hydroxide, calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, ferrous hydroxide, basic zinc carbonate, basic lead carbonate, Examples include silica sand, clay, talc, silica, titanium dioxide, magnesium silicate, and the like. As the plasticizer, for example, dioctyl phthalate,
Examples thereof include phthalic acid esters such as dibutyl phthalate and butylbenzyl phthalate, phosphoric acid esters, chlorinated fatty acid esters, chlorinated paraffins, epoxies, polyesters, and adipic esters. As the foaming agent, for example, azodicarbonamide, azo type such as azobisisobutyronitrile, hydrazide type such as toluenesulfonyl hydrazide, benzenesulfonyl hydrazide,
Examples thereof include nitroso-based compounds such as dinitropentamethylenetetramine. Stabilizers are used with blowing agents,
It is used to control the foaming temperature,
Examples include composites such as barium / zinc mixtures, lead-based, tin-based, and calcium-based. Examples of the lubricant include paraffin, low molecular weight polyolefin, stearic acid, stearic acid ester, stearyl alcohol, petrolatum, and polyglycol ester of fatty acid. Examples of the pigment include organic pigments such as azo lake, quinacridone, and phthalocyanine, and inorganic pigments such as chromium titanium and red iron. Examples of the antioxidant include phenol-based, phosphorus-based, and hindered phenol-based antioxidants.
Examples of the ultraviolet absorber include benzotriazole-based and benzophenone-based. Examples of the flame retardant include phosphazene-based, phosphorus-based, and fluorine resin-based flame retardants.

Further, in the present invention, an adhesive layer (anchor coat layer) made of an adhesive resin may be provided between the coating layer containing the photocatalyst and the wallpaper substrate. As the adhesive resin, a known resin can be used, and examples thereof include ethylene vinyl acetate resin (EVA resin).

In producing wallpaper using the water-based paint for wallpaper of the present invention, a known method can be employed. For example,
The coating composition (knife coat,
According to known methods such as gravure coat, screen coat, engraving roll coat, flexo coat, etc.), coating (roller, spray, brush, mop, sponge, rag etc.), dipping, etc.
Apply to a sheet or film-like wallpaper substrate, dry,
Emboss processing for wallpaper may be applied. Before embossing, foaming of the wallpaper substrate or pattern printing (uplifting printing) may be performed. Further, the coating composition of the present invention may be formed into a film by processing, and the film may be laminated on a wallpaper substrate. Lamination can be performed according to a known method, for example, using a hot roll at 60 to 200 ° C.
Temperature. Alternatively, a melt extrusion die, a T die, a multilayer simultaneous extrusion die, or the like may be used. The coating amount of the coating layer formed in this manner is not particularly limited and can be appropriately selected from a wide range, but is usually ² to 30 g / m ^{2 on} one side.
Degree, preferably about 5 to ²⁰ g / m ² .

In order to form a good deep embossed pattern on the surface of the coating layer comprising the water-based paint for wallpaper of the present invention,
There is no need to perform any special operation, and a conventional general wallpaper embossing process may be performed.

The thus obtained wallpaper of the present invention has a deep embossed pattern on its surface, is rich in decorativeness, and has a high quality texture. At the same time, the photocatalytic function that has been confirmed conventionally, especially the deodorizing and deodorizing performance,
Fully demonstrates antibacterial performance and organic dirt decomposition performance.

In order to form a good deep embossed pattern on the surface of the coating layer comprising the water-based paint for wallpaper of the present invention,
There is no need to perform any special operation, and a conventional general wallpaper embossing process may be performed.

[0038]

The present invention will be specifically described below with reference to Examples, Comparative Examples and Test Examples.

Examples 1 to 8 and Comparative Examples 1 to 4 Preparation of water-based paint for wallpaper Using a stirrer, polyoxyethylene alkyl ether (HLB = 10.
5, hereinafter referred to as “POE alkyl ether”). Further, the following titanium dioxide was added and mixed for 30 minutes. Subsequently, an emulsion of a reactive silicone compound and an aqueous solution of polyvinyl alcohol were added and mixed for 30 minutes. Finally, a viscosity of 4000 to 5000 mPa with a nonionic thickener (trade name: Neo Sticker N, manufactured by Nikka Chemical Co., Ltd.)
After adjusting to s, a water-based paint for wallpaper was produced. Specifically, the following components were used. The mixing ratio (parts by weight) of each component is as shown in Tables 1 to 3.

(1) Titanium dioxide Titanium dioxide A: monoclinic fibrous titanium dioxide (trade name: MTW-500, manufactured by Otsuka Chemical Co., Ltd., average fiber diameter: 0.3)
μm, average fiber length 10 μm, aspect ratio 33) Titanium dioxide B: monoclinic fibrous titanium dioxide (trade name: MTW-200, manufactured by Otsuka Chemical Co., Ltd., average fiber diameter 0.1)
μm, average fiber length 3 μm, aspect ratio 30) Titanium dioxide C: particulate titanium dioxide (trade name: ST-
01, manufactured by Ishihara Sangyo, average particle diameter 7 nm) Titanium dioxide D: Particulate titanium dioxide (trade name: ST-
41, manufactured by Ishihara Sangyo, average particle size 0.2 μm)

(2) Emulsion of reactive silicone compound Silicone emulsion E: about 40% by weight of terminally hydroxylated polydimethylsiloxane having a weight average molecular weight (Mw) of about 350,000, obtained by emulsion polymerization using sodium dodecylbenzenesulfonate and POE alkyl ether Silicone emulsion F containing: Silicone emulsion F: 700 parts by weight of the above silicone emulsion E, 250 parts by weight of aqueous colloidal silica having a specific gravity of 1.21 containing about 30% by weight of SiO ₂ and stabilized with sodium ions, and 50 parts by weight of dioctyltin dilaurate Silicone emulsion G with mixed parts Silicone emulsion G: Weight average molecular weight (Mw) of about 200,000 obtained by emulsion polymerization using sodium dodecylbenzenesulfonate and POE alkyl ether Emulsion containing about 40% by weight of terminally methylated polydimethylsiloxane

(3) Polyvinyl alcohol (abbreviated as PVA) PVA aqueous solution H: 20% by weight aqueous solution of polyvinyl alcohol having a saponification degree of 90% (4% aqueous solution viscosity: 30 mPa · s) PVA aqueous solution I: polyvinyl alcohol having a saponification degree of 75% 20% aqueous solution (4% aqueous solution viscosity 15 mPa · s)

[0043]

[Table 1]

[0044]

[Table 2]

[0045]

[Table 3]

2. Preparation of wallpaper A water-based paint obtained as described above is screened by a Tsujii-type automatic printing machine on a base material provided with an ethylene vinyl acetate resin (EVA) coat layer on a base paper for wallpaper made by Kishu Paper Co., Ltd. having a thickness of 0.125 mm. After coating (# 700 solid) and pre-drying (100 ° C. × 1 minute), embossing was performed at 150 ° C. to prepare a wallpaper of the present invention and a comparative wallpaper.

Test Example 1 Various properties of the wallpaper obtained in Examples 1 to 8 and Comparative Examples 1 to 4 were evaluated according to the following methods. Further, as Comparative Example 5, the same performance test was performed on the wallpaper base material itself not coated with the water-based paint. The results are shown in Tables 4 and 5.

(1) Soil decomposability (fading) Methanol blue (MB) in ethanol (10 pp
m) was brushed and dried at 60 ° C for 1 hour.
In accordance with IS L-0824, carbon fade o
Irradiation was performed at 63 ° C. for 20 hours using a meter, and the b value (blueness) of the sample before and after irradiation with UV light was measured using a Minolta CM-3700d colorimeter, and the degree of fading was calculated based on the following formula. Fading degree (%) = (X / Y) × 100 X: b value after MB coloring−b value after UV light irradiation Y: b value after MB coloring−b value before MB coloring

(2) Friction Fastness The state of the coated surface after 25 dry frictions and 2 wet frictions (200 g load) was determined using a Gakushin type friction tester according to JIS L-0849. Good: Class 5 to Bad: Class 1

(3) Coatability It was visually observed whether repelling, uneven coating, etc., occurred during coating. Grade 3: Uniform coating, no repelling or uneven coating is observed. Second grade: Repelling and uneven coating are slightly observed. Grade 1: Repelling and uneven coating are strong and uneven.

(4) Cracking property at the time of bending The wallpaper was bent at 180 degrees, and it was visually observed whether or not cracking occurred. The evaluation of the crack is as follows. Table 3 simply shows "crackability". Class 3: No cracks at all Class 2: Slight cracks on the surface Class 1: Deep cracks at the surface

(5) Design The design was evaluated as follows based on the whiteness of the embossed wallpaper surface and the sharpness of the embossed pattern. Whiteness: The Hunter White Index (HWI) was measured using a Minolta CM-3700d colorimeter. Here, the higher the HWI value, the higher the whiteness. Sharpness: Visual judgment was made based on the following criteria. Grade 3: The pattern is deep and the pattern is clear. 2nd grade: Both patterns and patterns are medium. Grade 1: The pattern is shallow, and the pattern is unclear.

(6) Photocatalytic Coagulation The prepared water-based paint was filtered through # 1600 gauze, and the occurrence of aggregates of titanium dioxide was observed and evaluated as follows. Grade 3: No aggregates are generated. Secondary: Small amount of aggregates was generated. Grade 1: A large amount of aggregates are generated.

[0054]

[Table 4]

[0055]

[Table 5]

From Tables 4 and 5, it can be seen that the wallpaper of the present invention has higher whiteness than the conventional wallpaper and a deep embossed pattern is formed on the surface thereof, so that it exhibits extremely excellent decorativeness. it is obvious. Furthermore, it turns out that the wallpaper of this invention is excellent also in the photocatalytic function, such as a soil decomposition property.

[0057]

According to the present invention, the coating layer made of the water-based paint for wallpaper has the same or higher protective function, deodorizing performance, antibacterial performance and decomposition of organic soil as the coating layer made of the conventional photocatalyst-containing paint. It has excellent decorative properties such as excellent embossed pattern formed on its surface, high whiteness, and very little decrease in whiteness even after long-term storage, and has a high quality texture. . The photocatalyst-containing paint of the present invention can also form a deep and beautiful embossed pattern when applied to a polyolefin-based wallpaper material.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kimiyuki Suezada 4-231-1, Bunkyo, Fukui City, Fukui Prefecture Inside Nikka Kagaku Co., Ltd. (72) Inventor Shoichi Shoda 4-23, Bunkyo, Fukui City, Fukui Prefecture No. 1 Inside Nikka Kagaku Co., Ltd. (72) Inventor Koji Midori 4-23-1, Bunkyo, Fukui City, Fukui Prefecture Inside Nikka Kagaku Co., Ltd. (72) Inventor Minoru Aki Minoru 463 Otsuka Chemical Co., Ltd.Tokushima Research Laboratories (72) Inventor Toshiaki Yagi 463 Kasuno, Kawauchi-cho, Tokushima City, Tokushima Prefecture Otsuka Chemical Co., Ltd. No. 27 No. 27 Otsuka Chemical Co., Ltd. F-term (reference) 4F055 AA17 BA12 BA18 CA13 CA16 EA04 EA07 EA22 EA24 EA26 FA07 FA27 FA40 GA03 HA06 4J038 CE022 DL031 GA03 HA216 KA19 MA08 MA10 PB05 PC08

Claims (6)

[Claims] 1. An aqueous paint for wallpaper comprising fibrous monoclinic titanium dioxide, a reactive silicone compound and polyvinyl alcohol as active ingredients. 2. The composition according to claim 1, comprising 3 to 30% by weight of fibrous monoclinic titanium dioxide, 3 to 30% by weight of a reactive silicone compound and 0.5 to 5% by weight of polyvinyl alcohol.
The water-based paint for wallpaper according to 1. 3. The aqueous coating composition for a wallpaper according to claim 1, wherein the reactive silicone compound is an emulsion of a hydroxylated polydiorganosiloxane. 4. Polyvinyl alcohol having a saponification degree of 70
The water-based paint for wallpaper according to claim 1 or 2, wherein the water-based paint is 1 to 100%. 5. A sheet or film-like base material for wallpaper,
A wallpaper provided with a coating layer comprising the aqueous paint for wallpaper according to claim 1. 6. The wallpaper according to claim 5, wherein the wallpaper substrate is a polyolefin-based substrate.