JPH1199585A - Antibacterial, deodorant mat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sterilize effectively germs existing in the fouled matter stuck on the surface of a mat without marring the appearance by forming on the surface a photocatalyst consisting of titanium dioxide for sterilizing germs or bacteria through a photooxidation effect or restraining the multiplication thereof. SOLUTION: A photocatalyst layer is formed on the surface, which consists of titanium dioxide for sterilizing germs or bacteria through a photooxidation effect or restraining multiplication. The photocatalyst is made 1 μm or lower in its thickness, and titanium dioxide is made 20 nm in its particle diameter so as to avoid colors of a mat from being damaged. Also, at least one kind of silver, copper, and zinc in addition to the titanium dioxide as photocatalyst particles is carried on the photocatalyst layer, thereby sterilizing germs or bacteria or restraining the multiplication thereof through a photooxidation effect and antibacterial effect. In addition, if such a photocatalyst layer is formed on the surface of a transparent sheet and an adhesive layer is formed on the rear surface of the transparent sheet, it can be adhered to an existing mat for giving an antibacterial function and deodorizing function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial and deodorant mat for use in toilets, washrooms, kitchens and the like.

[0002]

2. Description of the Related Art In toilets, washrooms, kitchens, and the like, mats for preventing floor soiling from water stains have been conventionally used. Since this mat is used in an environment where various germs easily adhere, it is known that the mat has been subjected to an antibacterial treatment.
More specifically, an organic antibacterial agent or an inorganic antibacterial agent such as silver zeolite is added to the mat raw material for molding.

[0003] Although there is no example of application to a mat, International Publication No. WO94 / 11092 provides a photocatalytic coating on the surface of a base material such as a tile, so that faint light radiated from indoor lighting such as a fluorescent lamp is provided. It is disclosed that the photocatalyst is photoexcited by ultraviolet rays to perform antibacterial and decompose contaminants.

[0004]

When an antibacterial agent is added to a mat raw material and molded, most of the antibacterial agent is buried in the mat raw material and very few antibacterial agents are exposed on the surface. It cannot be effective. Especially,
When using a silver-based inorganic antibacterial agent, there is a problem that if added in a large amount, it becomes blackish brown.On the other hand, when an organic antibacterial agent is used, a large amount added causes a human body to be dislodged with the amount released. It can also have a negative effect.

[0005] International Publication WO94 / 11092
By simply applying the technology described in the above item to the mat, the color tone of the mat may change or the appearance may be adversely affected.

[0006]

According to the present invention, there is provided an antibacterial / odor control mat according to the present invention, comprising a photocatalytic layer made of titanium dioxide, which suppresses the growth of bacteria and microorganisms by killing or inhibiting their growth by photooxidation. Formed.

As an example of a form that does not impair the color tone of the mat, the thickness of the photocatalyst layer is 1 μm or less, and the particle diameter of titanium dioxide is 20 nm or less.

[0008] At least one of silver, copper, and zinc, in addition to titanium dioxide as photocatalyst particles, is supported on the photocatalyst layer to kill or multiply bacteria and microorganisms by photooxidation and antibacterial action. Can be suppressed.

Further, if the photocatalyst layer is formed on the surface of the transparent sheet and an adhesive layer is formed on the back surface of the transparent sheet,
By attaching this transparent sheet to an existing mat, an antibacterial function and a deodorant function can be provided.

As means for forming titanium dioxide on the mat surface, a titanium dioxide film is formed on a polymer sheet in advance and then processed into a mat shape, or a titanium dioxide film is formed on a sheet processed into a mat shape.

As the polymer sheet, polyvinyl chloride, polyethylene terephthalate, polyethylene, polypropylene, polyurethane and the like are used.

As a method for coating the photocatalyst (titanium dioxide) on the surface of the polymer sheet, a flow coating method or a spray coating method using a fine sol solution of titanium dioxide is preferable. Formed by dispersing titanium,
The fine sol solution of titanium dioxide is prepared with water or an alcohol having 4 or less carbon atoms so that the concentration of titanium dioxide becomes 10 wt% or less, and is preferably adjusted to pH 4 or less with nitric acid or the like.

As the silicone precursor for dispersing titanium dioxide, methyltrichlorosilane, methyltribromosilane, methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, methyltri-t-butoxysilane; ethyltrichlorosilane N-, ethyltribromosilane, ethyltrimethoxysilane, ethyltriethoxysilane, ethyltriisopropoxysilane, ethyltri-t-butoxysilane;
Propyltrichlorosilane, n-propyltribromosilane, n-propyltrimethoxysilane, n-propyltriethoxysilane, n-propyltriisopropoxysilane, n-propyltri-t-butoxysilane; n-hexyltrichlorosilane, n- Hexyltribromosilane, n-hexyltrimethoxysilane, n-hexyltriethoxysilane, n-hexyltriisopropoxysilane, n-hexyltri-t-butoxysilane; n-decyltrichlorosilane, n-decyltribromosilane, n
-Decyltrimethoxysilane, n-decyltriethoxysilane, n-decyltriisopropoxysilane, n-decyltri-t-butoxysilane; n-octadecyltrichlorosilane, n-octadecyltribromosilane, n-
Octadecyltrimethoxysilane, n-octadecyltriethoxysilane, n-octadecyltriisopropoxysilane, n-octadecyltri-t-butoxysilane;
Phenyltrichlorosilane, phenyltribromosilane, phenyltrimethoxysilane, phenyltriethoxysilane, phenyltriisopropoxysilane, phenyltri-t-butoxysilane; tetrachlorosilane, tetrabromosilane, tetramethoxysilane, tetraethoxysilane, tetrabutoxy Silane, dimethoxydiethoxysilane; dimethyldichlorosilane, dimethyldibromosilane, dimethyldimethoxysilane, dimethyldiethoxysilane; diphenyldichlorosilane, diphenyldibromosilane, diphenyldimethoxysilane, diphenyldiethoxysilane; phenylmethyldichlorosilane Phenylmethyldibromosilane, phenylmethyldimethoxysilane, phenylmethyldiethoxysilane; trichlorohydrosilane, Bromine hydrosilane, trimethoxy hydrosilane, triethoxy hydrosilane, tri-isopropoxy hydrosilane, tri t- butoxy hydrosilane; vinyltrichlorosilane, vinyltrimethoxysilane bromine silane, vinyltrimethoxysilane, vinyltriethoxysilane, vinyl triisopropoxysilane, vinyl tri t
-Butoxysilane; trifluoropropyltrichlorosilane, trifluoropropyltribromosilane, trifluoropropyltrimethoxysilane, trifluoropropyltriethoxysilane, trifluoropropyltriisopropoxysilane, trifluoropropyltri-t-butoxysilane; γ- Glycidoxypropylmethyldimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ
Glycidoxypropyltriisopropoxysilane, γ
-Glycidoxypropyltri-t-butoxysilane; γ-
Methacryloxypropylmethyldimethoxysilane, γ
-Methacryloxypropylmethyldiethoxysilane,
γ-methacryloxypropyltrimethoxysilane, γ
-Methacryloxypropyltriethoxysilane, γ-
Methacryloxypropyltriisopropoxysilane,
γ-methacryloxypropyltri-t-butoxysilane; γ-aminopropylmethyldimethoxysilane, γ-
Aminopropylmethyldiethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, γ-aminopropyltriisopropoxysilane, γ-aminopropyltri-t-butoxysilane;
γ-mercaptopropylmethyldimethoxysilane, γ-
Mercaptopropylmethyldiethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-mercaptopropyltriisopropoxysilane, γ-mercaptopropyltri-t-butoxysilane; β- (3,4-epoxy Cyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane; and their partial hydrolysates; and mixtures thereof, can be used.

The antimicrobial metal can be loaded on the titanium dioxide film either before or after coating the photocatalytic layer. As a method for supporting silver, copper, and zinc on a photocatalytic layer made of titanium dioxide, a pre-supporting method using a coating solution obtained by adding a soluble salt of these metals to a fine sol dispersion solution of titanium dioxide, forming a photocatalytic layer Thereafter, any of post-supporting methods of immersing in an aqueous solution containing a soluble salt of these metals or applying the aqueous solution and irradiating with light to perform photoreduction precipitation can be used.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

(Example 1) Mixed liquid separation of titanium dioxide sol and tetraethoxysilane (Si (OCH ₂ CH ₃ ) ₄ ) (manufactured by Ishihara Sangyo, S
A dispersion solution of TK-01 and STK-03 was prepared so that the weight ratio of titanium dioxide sol and tetraethoxysilane was 65:35, and polyethylene terephthalate (PE) was used.
T) The sheet was spray-coated to form a photocatalyst layer. Thereafter, using a 1% solution of copper acetate, irradiation was performed with a black light blue (BLB) fluorescent lamp at an illuminance of 1 mW / cm ² for 10 minutes to carry out photoreduction to carry copper.

In order to evaluate the antibacterial properties of the PET sheet coated with the photocatalyst, urine was actually dropped and allowed to stand at room temperature for 24 hours, and the increase or decrease in the number of bacteria was examined (sample A). As comparative examples, a sheet containing a silver-based inorganic antibacterial agent (sample B), a sheet containing an organic antibacterial agent (sample C), and untreated P without a photocatalytic layer
The ET sheet (sample D) was similarly evaluated. still,
The irradiation condition of the ultraviolet ray is only the fluorescent lamp illumination (1 μW / cm ² ) for about 8 hours after the urine is dropped.

FIG. 1 shows the antibacterial performance of each sheet. From this figure, it can be seen that the number of bacteria in the polymer sheet containing the inorganic and organic antibacterial agents and the untreated PET sheet without the photocatalyst layer tend to increase by several tens of times from the initial one, It was clarified that the PET sheet having the photocatalyst layer made of titanium dioxide supporting silver showed a clear phenomenon tendency, and was confirmed to have a sterilizing ability of 90% or more. Further, the mat according to the present invention had no change in color tone.

(Example 2) A silver nitrate solution was added to a mixed liquid separation (manufactured by Ishihara Sangyo, STK-01, STK-03) of a titanium dioxide sol and tetraethoxysilane (Si (OCH ₂ CH ₃ ) ₄ ), followed by ultraviolet irradiation. Coating solution carrying silver by photoreduction with polyethylene terephthalate (PET)
The sheet was flow-coated to form a photocatalyst layer. As in Example 1, the increase and decrease in the number of bacteria before and after the dropping of actual urine was evaluated. It had a bactericidal ability of 90% or more like titanium dioxide supporting copper, and the number of bacteria showed a clear decreasing tendency without showing an increasing tendency.

(Example 3) A mixture of titanium dioxide sol and tetraethoxysilane (Si (OCH ₂ CH ₃ ) ₄ ) (STK-01, STK-03, manufactured by Ishihara Sangyo) was mixed with titanium dioxide sol and tetraethoxysilane at 65%. : 35, and a dispersion solution was prepared so as to have a weight ratio of: 35, and spray-coated on a polyethylene terephthalate (PET) sheet to form a photocatalyst layer. Then, using a 1% aqueous solution of silver nitrate, 1 mW / cm ^{2 with} a black light blue (BLB) fluorescent lamp.
Irradiation was carried out for 10 minutes at an ultraviolet illuminance of the above to carry out photoreduction to carry silver. The sheet prepared above was attached to a bath lid in a bathroom, and an actual bathing test was performed to evaluate occurrence of "sliminess" of the bath lid. In addition, bathing was set to 4 persons / day. As a result of the above test, about 3
After bathing for months, 28 out of 30 had a sensory result that no "slime" occurred.

FIG. 2 shows an example of a mode of use of the antibacterial and deodorant mat according to the present invention. The present invention is not limited to this mode of use, and can also be used as a mat in a washroom or a kitchen.

[0021]

As described above, according to the present invention, the photocatalyst layer is formed on the surface of the mat in a form that does not impair the color tone of the mat. In order to efficiently kill existing cells, the decomposition of dirt by the bacteria is prevented, thereby preventing the generation of secondary unpleasant odors.

Further, by supporting at least one of silver, copper, and zinc in addition to titanium dioxide as photocatalyst particles on the photocatalyst layer, bacteria or microorganisms are killed or multiplied by photooxidation and antibacterial effects. Can be suppressed.

Further, if the photocatalyst layer is formed on the surface of the transparent sheet and an adhesive layer is formed on the back surface of the transparent sheet,
By pasting this transparent sheet directly on the existing mat and the water surrounding space in the process, for example, the bath lid in the bathroom, the outer wall of the bathroom, the bath mat or the floor, the existing pattern etc. is utilized as it is and the antibacterial function A deodorant function can be provided.

Furthermore, if the coating solution for the photocatalyst is sealed in a spray can, it can be simply sprayed on an existing mat.
Antibacterial and deodorant properties can be easily imparted at home.

[Brief description of the drawings]

FIG. 1 is a graph comparing the sterilization ability of a mat according to the present invention and a mat according to a comparative example.

FIG. 2 is a diagram showing an example of a use mode of a mat.

Claims (4)

[Claims] 1. An antibacterial and deodorant mat having a photocatalytic layer made of titanium dioxide on its surface which kills or suppresses the growth of bacteria and microorganisms by photooxidation, wherein the photocatalytic layer is in a form which does not impair the color tone of the mat. An antibacterial and deodorant mat characterized by being formed. 2. The antibacterial and deodorant mat according to claim 1, wherein the color tone of the mat does not impair the color tone of the mat, and the photocatalyst layer has a thickness of 1 μm or less and a titanium dioxide particle diameter of 20 nm or less. Antibacterial and deodorant mat. 3. The antibacterial agent according to claim 1 or 2,
In the deodorant mat, the photocatalyst layer carries at least one of silver, copper, and zinc as an antibacterial metal that kills bacteria or microorganisms by an antibacterial action or suppresses the proliferation thereof. Deodorant mat. 4. The antibacterial agent according to claim 1 or 2,
In the deodorizing mat, the photocatalyst layer is formed on the surface of the transparent sheet, and the adhesive layer is formed on the back surface of the transparent sheet.