JP2776259B2 - Antibacterial inorganic paint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial inorganic coating.

[0002]

2. Description of the Related Art In an antibacterial organic paint containing an antibacterial agent in an organic resin, the resin deteriorates when used for a long period of time. Especially when used outdoors, dirt adheres to the surface,
There is a disadvantage that the antimicrobial performance of the coating film is apt to decrease due to the deterioration due to ultraviolet rays. Therefore, inorganic coatings containing an antibacterial agent in a silicate-based, phosphate-based, zirconium-based inorganic composition are known, but the above-mentioned inorganic coatings have better durability than organic coatings. Since it is necessary to bake at a high temperature of 200 ° C. or more, the usable range is limited, and it is not suitable for directly applying to building materials and plastics. It should be noted that the silicate-based inorganic coating has a disadvantage that when used for a long period of time, the alkali is eluted to the surface and the efflorescence phenomenon easily occurs. Also,
JP-A-62-57470 discloses an inorganic coating containing a metal alkoxide. Although this inorganic coating cures at 200 ° C. or lower, the coating has no flexibility.
There is a problem of cracks. In recent years, there has been a demand for a paint that can be baked at a temperature of 200 ° C. or less, which has antibacterial properties even when used for a long period of time and has no cracks, because of the necessity of using a paint for various materials.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has as its object to maintain antibacterial performance for a long time, to be baked at a temperature of 200 ° C. or less, and to be flexible. An object of the present invention is to provide an antibacterial inorganic paint having a property.

[0004]

The antibacterial inorganic coating according to claim 1 of the present invention comprises (a) a silicon compound represented by the general formula: Si (OR ¹ ) ₄ and / or colloidal silica ; (b) the general formula: R ² Si (OR ¹⁾ a silicon compound represented by _3, (iii) the general formula: R ² ₂ Si inorganic coating having the composition of (OR ¹⁾ a silicon compound represented by _2, the arrangement
In addition, in the antibacterial inorganic paint containing an antibacterial agent , (a)
Silicon compounds, and / or, colloidal silica
An organic solvent-dispersible roller dispersed in a non-aqueous organic solvent
20 to 200 parts by weight of idal silica, 100 parts by weight of the silicon compound (b) , 0 to 60 parts of the silicon compound (c)
In a proportion of parts, the weight-average molecular weight of the inorganic paint containing them is Ri der 900 or more in terms of polystyrene,
And the antimicrobial agent contains a component having a photocatalytic function.
It is characterized by being an antibacterial agent . [The above R ¹ and R ² represent a monovalent hydrocarbon group. ] Antibacterial inorganic coating material according to claim 2 of the present invention, the antibacterial inorganic coating of claim 1 wherein the component having an upper Symbol photocatalytic function of titanium oxide, zinc oxide, tin oxide, iron oxide, zirconium oxide, Selected from the group consisting of tungsten oxide, chromium oxide, molybdenum oxide, ruthenium oxide, germanium oxide, lead oxide, cadmium oxide, copper oxide, vanadium oxide, niobium oxide, tantalum oxide, manganese oxide, cobalt oxide, rhodium oxide and rhenium oxide It is characterized by at least one kind.

The antibacterial inorganic coating according to claim 3 of the present invention is the antibacterial inorganic coating according to claim 1 or 2, wherein the antibacterial agent containing the photocatalytic component is an oxidizing agent having a photocatalytic function. It is a clay mineral having a material inserted between layers.

The antibacterial inorganic coating according to claim 4 of the present invention is the antibacterial inorganic coating according to claim 3 , wherein the oxide having the photocatalytic function is titanium oxide, zinc oxide, tin oxide, iron oxide, From the group consisting of zirconium, tungsten oxide, chromium oxide, molybdenum oxide, ruthenium oxide, germanium oxide, lead oxide, cadmium oxide, copper oxide, vanadium oxide, niobium oxide, tantalum oxide, manganese oxide, cobalt oxide, rhodium oxide and rhenium oxide It is characterized by being at least one selected from.

According to a fifth aspect of the present invention, there is provided the antibacterial inorganic coating according to any one of the first to fourth aspects, wherein a metal or metal is carried on the component or oxide having the photocatalytic function. It is characterized by having been done.

The antibacterial inorganic coating according to claim 6 of the present invention is the antibacterial inorganic coating according to claim 5, wherein the metal is silver, copper, iron, nickel, zinc, platinum, gold, palladium, cadmium, It is at least one selected from the group consisting of cobalt, rhodium, and ruthenium.

Hereinafter, the present invention will be described in detail. The antibacterial inorganic coating of the present invention contains an antibacterial agent in the inorganic coating.

The above inorganic coating will be described. The inorganic paint of the antibacterial inorganic paint according to claim 1 of the present invention is a silicon compound represented by the following formula [3], and / or
Organic solution of colloidal silica dispersed in non-aqueous organic solvent
20 to 200 parts by weight of colloidal silica as colloidal silica which is dispersible in a medium ; general formula: Si (OR ¹ ) ₄ [3] 100 parts by weight of a silicon compound represented by the following general formula [4]; General formula: R ² Si (OR ¹ ) ₃ [4] A silicon compound represented by the following general formula [5] is used in an amount of 0 to 60.
It is contained in parts by weight. General _{^{formula: R 2 2 Si (OR 1}} ) 2 [5] The above R ^1, R ² represents a monovalent hydrocarbon group.

The silicon compound has a general formula represented by the following formula [6]. R ² _n Si (OR ¹⁾ shows a _4-n [6] ^{[n = 0~3, R 1, R} 2 represents a monovalent hydrocarbon group. R ¹ and R ^{2 in} the above formula [6] are not limited as long as they represent a monovalent hydrocarbon group, but R ² represents a substituted or unsubstituted hydrocarbon group having 1 to 8 carbon atoms, for example, methyl Group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, alkyl group such as octyl group, cycloalkyl group such as cyclopentyl group and cyclohexyl group;
Phenylalkyl group, aralkyl group such as 3-phenylpropyl group, phenyl group, aryl group such as tolyl group, vinyl group, anenyl group such as allyl group, chloromethyl group, γ
-Chloropropyl group, halogen-substituted hydrocarbon group such as 3,3,3-trifluoropropyl group, and γ-methacryloxypropyl group, γ-glycidoxypropyl group, 3,4-epoxycyclohexylethyl group, γ -A substituted hydrocarbon group such as a mercaptopropyl group. Among them, an alkyl group having 1 to 4 carbon atoms and a phenyl group are preferable from the viewpoint of ease of synthesis or availability.

As R ¹ in the above formula [6], those using an alkyl group having 1 to 4 carbon atoms as a main raw material are used. In particular, n = 0
Examples of the tetraalkoxysilane include tetramethoxysilane and tetraethoxysilane, and examples of the organotrialkoxysilane having n = 1 include methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxysilane, and phenyltrimethoxysilane. Phenyltriethoxysilane, 3,3,3-trifluoropropyltrimethoxysilane and the like. Further, n = 2
Examples of diorganodialkoxysilanes include dimethyldimethoxysilane, dimethyldiethoxysilane, diphenyldimethoxysilane, diphenyldiethoxysilane, and methylphenyldimethoxysilane. Examples of triorganoalkoxysilanes with n = 3 include trimethylmethoxysilane. , Trimethylethoxysilane, trimethylisopropoxysilane, dimethylisobutylmethoxysilane and the like.

The above R ¹ and R ² are represented by the above formulas [3], [4],
In [5], the same hydrocarbon group may be present or different.

For the preparation of the above inorganic coating, for example, a silicon compound represented by the above formulas [3], [4], and [5] is diluted with a solvent, and water or a catalyst is added as a curing agent, followed by hydrolysis, And it is prepared by performing a polycondensation reaction. The weight average molecular weight (Mw) of these silicon compounds is calculated in terms of polystyrene. In this preparation, the weight average molecular weight (Mw) of the inorganic coating is adjusted to 900 or more in terms of polystyrene. When the weight average molecular weight (Mw) is less than 900 in terms of polystyrene, the curing shrinkage becomes large during the polycondensation reaction, and cracks are easily generated in the baked inorganic paint film.

The inorganic coating may be used in combination with the silicon compound represented by the above formula [3], or may contain colloidal silica instead. The colloidal silica,
Organic solvent-dispersible colloidal silica dispersed in a non-aqueous organic solvent such as alcohol. The colloidal silica contains 20 to 50% by weight of silica as a solid content. Colloidal silica dispersible in an organic solvent can be easily prepared by replacing the organic solvent with water. Examples of the organic solvent in which the colloidal silica is dispersed include lower aliphatic alcohols such as methanol, ethanol, isopropanol, n-butanol and isobutanol, ethylene glycol, ethylene glycol monobutyl ether, and ethylene glycol monoethyl ether acetate. And derivatives of diethylene glycol such as diethylene glycol and diethylene glycol monobutyl ether, and diacetone alcohol. One or more of these are used. Further, in combination with a hydrophilic organic solvent, toluene, xylene, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, methyl ethyl ketoxime and the like can also be used. The amount of the colloidal silica is a weight including the dispersion medium.

Water is generally used as a curing agent when preparing an inorganic paint, and the amount of water is preferably 45% or less, more preferably 25% or less in the inorganic paint.

The organic solvent used for preparing the inorganic coating includes, for example, lower aliphatic alcohols such as methanol, ethanol, isopropanol, n-butanol, isobutanol, ethylene glycol, ethylene glycol monobutyl ether, and ethylene glycol monoacetate. Ethylene glycol derivatives such as ethyl ether; diethylene glycol derivatives such as diethylene glycol and diethylene glycol monobutyl ether; and diacetone alcohol.
More than one species is used. Further, toluene, xylene, ethyl acetate, butyl acetate, methyl ethyl ketone, methyl isobutyl ketone, methyl ethyl ketoxime and the like can be used in combination with a hydrophilic organic solvent.

In the preparation of the above inorganic coating, the p of the inorganic coating is
It is desirable for H to be 3.8-6. When the pH is within this range, the preservability of the inorganic coating is good, and when the pH is outside the pH range, the application period from the preparation period is limited. The method of adjusting the pH is not limited. For example, when the pH is less than 3.8 when the materials are mixed, the pH may be adjusted by adding a basic reagent such as ammonia, and the pH exceeds 6. In this case, it may be adjusted by adding an acidic reagent such as hydrochloric acid.
In addition, depending on the pH, when the reaction progresses slowly in a state where the molecular weight is small, heating may be used to accelerate the reaction,
After the reaction is advanced by lowering the pH with an acidic reagent, a basic reagent may be added to adjust the pH to a predetermined value.

Next, the antibacterial agent contained in the antibacterial inorganic paint of the present invention will be described. The antibacterial agent is one that contains a component having a photocatalytic function. Examples of the component having a photocatalytic function contained in the antibacterial agent include titanium oxide, zinc oxide, tin oxide, iron oxide, zirconium oxide, tungsten oxide, chromium oxide, molybdenum oxide, ruthenium oxide, germanium oxide, lead oxide, and oxide. Cadmium, copper oxide, vanadium oxide, niobium oxide, tantalum oxide, manganese oxide, cobalt oxide, rhodium oxide, rhenium oxide, and a mixture of two or more of these can be used. The component having the photocatalytic function is mixed into the inorganic paint as long as the function and weather resistance of the inorganic paint are not impaired.

Further, the antibacterial inorganic paint may contain an antibacterial agent in a state where a metal is supported on the component having the photocatalytic function. Examples of the metal include silver, copper, iron, nickel, zinc, platinum, gold, palladium, cadmium, cobalt, rhodium, and ruthenium, or a mixture of two or more thereof. When a metal is supported on a component having a photocatalytic function, charge separation is promoted, and the photocatalyst is activated. It is preferable that the carried metal has antibacterial properties, because the antibacterial properties are further improved.

Further, the antibacterial inorganic paint may contain, as an antibacterial agent, a clay mineral in which an oxide having a photocatalytic function is inserted between layers. As the clay mineral, a smectite-type mineral having swellability is suitable. The smectite-type mineral may be natural or synthetic. The oxide inserted into the clay mineral is titanium oxide, zinc oxide, tin oxide, iron oxide, zirconium oxide, tungsten oxide, chromium oxide, molybdenum oxide, ruthenium oxide, germanium oxide, lead oxide, cadmium oxide, copper oxide, At least one of vanadium oxide, niobium oxide, tantalum oxide, manganese oxide, cobalt oxide, rhodium oxide, rhenium oxide, and the like is given. When an oxide is inserted between layers of the clay mineral, the oxide is retained by the fine particles, exhibits high photocatalytic activity, and improves antibacterial properties. Further, a metal may be supported on an oxide having a photocatalytic function inserted between layers. As the above metal,
For example, silver, copper, iron, nickel, zinc, platinum, gold, palladium, cadmium, cobalt, rhodium, ruthenium alone or a mixture of two or more thereof can be mentioned. When a metal is carried on an oxide having a photocatalytic function, charge separation is promoted and the photocatalyst is activated, so that antibacterial properties are improved, which is preferable. It is preferable that the carried metal has antibacterial properties, because the antibacterial properties are further improved.

When preparing an antibacterial inorganic coating, the above-mentioned component having a photocatalytic function and the antibacterial agent containing an oxide include the component having a photocatalytic function, and a state in which the oxide is dispersed in a solvent or a powder. Used in The powder is obtained by drying such as heat drying, freeze drying, and supercritical drying.

The method of applying the antibacterial inorganic paint is brush coating,
Various coating methods such as spray coating, dipping, curtain, and knife coating can be adopted. At the time of application, it may be appropriately diluted with an organic solvent as needed.

As a method for treating a coating film coated with an antibacterial inorganic coating, depending on the type and the containing method of the above antibacterial agent, when a coating is formed, the silicone component in the inorganic coating wraps around the antibacterial agent component, and It may not be possible to sufficiently exhibit the properties, so it is preferable to treat the surface of the coated and dried coating film with an acid or alkali. When the surface of the coating film is treated with an acid or an alkali, the silicone component is eluted and the antibacterial agent is exposed on the surface, so that the antibacterial property is improved. The type of the acid and alkali, the state of the liquid and the gas, and the like are not particularly limited. However, in the case of a weak acid or a weak alkali, the treatment time needs to be longer. The treatment method may be immersion in a solution or treatment in a gas phase by placing an article to be coated in a chamber.

[0025]

Next, examples of the present invention and comparative examples will be described. The molecular weight is a value determined by gel permeation chromatography (GPC) using a measurement model HLC8020 (manufactured by Tosoh Corporation) and obtained from a calibration curve of standard polystyrene.

Reference Example 1 Tetraethoxysilane is used as the silicon compound represented by the formula [3], and IPA organosilica sol is used as colloidal silica (trade name: OSCAL14, manufactured by Catalyst Chemicals, Inc.).
32), methyltrimethoxysilane was used as the silicon compound represented by the formula [4], dimethyldimethoxysilane was used as the silicon compound represented by the formula [5], and silver nitrate was used as an antibacterial agent.

To 100 parts by weight of methyltrimethoxysilane (hereinafter referred to as “parts”), 10 parts of tetraethoxysilane,
90 parts of IPA organosilica sol, 30 parts of dimethyldimethoxysilane, isopropyl alcohol (IPA)
Was mixed, and 90 parts of water was added, followed by stirring. This was adjusted to a weight average molecular weight (hereinafter referred to as Mw) of 1500 in a thermostat at 60 ° C. 20 parts of silver nitrate was added to this prepared solution to obtain an antibacterial inorganic coating.

The obtained antibacterial inorganic paint was applied to an alumina substrate washed with acetone, and dried at a temperature of 150 ° C. for 1 hour. The film thickness of the cured coating film was 10 μm.

[0029] Instead of the silver nitrate in Reference Example 2 Reference Example 1, except for using zinc nitrate as an antibacterial agent was obtained antibacterial inorganic coating in the same manner as in Reference Example 1. The obtained antibacterial inorganic paint was applied to an alumina substrate washed with acetone in the same manner as in Reference Example 1, and dried at a temperature of 150 ° C. for 1 hour. The film thickness of the cured coating film was 10 μm.

[0030] Instead of the silver nitrate in Reference Example 3 Reference Example 1, octadecyl trimethyl as an antibacterial agent: except for using (NOF Corporation tradename cation AB) is to obtain antibacterial inorganic coating in the same manner as in Reference Example 1 Was. The obtained antibacterial inorganic paint was applied to an alumina substrate washed with acetone in the same manner as in Reference Example 1, and the temperature was adjusted to 15 ° C.
Dry at 0 ° C. for 1 hour. The thickness of the cured coating film is 10 μm
Met.

Reference Example 4 Same as Reference Example 1 except that 20 parts of silver nitrate of Reference Example 1 was replaced with 10 parts of an organic iodine compound (manufactured by Takeda Pharmaceutical Co., Ltd., trade name: Coatside 123) as an antibacterial agent. Thus, an antibacterial inorganic paint was obtained. The obtained antibacterial inorganic paint is
It was applied to an alumina substrate washed with acetone in the same manner as in Reference Example 1, and dried at 150 ° C. for 1 hour. The film thickness of the cured coating film was 10 μm.

REFERENCE EXAMPLE 5 IPA organosilica sol (trade name: OSCAL1432, manufactured by Catalyst Kasei Co., Ltd.) as colloidal silica, methyltrimethoxysilane as a silicon compound represented by the above formula [4], and a benzimidazole compound as an antibacterial agent A compounding agent of an organic nitrogen halide compound (manufactured by Takeda Pharmaceutical Co., Ltd., trade name: Coatside DX) was used.

In 100 parts of methyltrimethoxysilane, I was added
After mixing 60 parts of PA organosilica sol and 100 parts of isopropyl alcohol (IPA), 60 parts of water was added and stirred. This was adjusted to a molecular weight of Mw = 950 in a thermostat at 60 ° C. To the prepared liquid, 5 parts of a compounding agent of a benzimidazole compound and an organic nitrogen halide compound was added to obtain an antibacterial inorganic paint.

The obtained antibacterial inorganic paint was applied to an alumina substrate washed with acetone, and dried at a temperature of 150 ° C. for 1 hour. The film thickness of the cured coating film was 10 μm.

[0035] Instead of the antimicrobial agent 5 parts of Example 1 Reference Example 5, titanium oxide powder: antimicrobial except for using (Nippon Aerosil Co., Ltd. trade name P-25) 20 parts in the same manner as in Reference Example 5 An inorganic paint was obtained.
The obtained antibacterial inorganic paint was applied to an alumina substrate washed with acetone in the same manner as in Reference Example 1, and dried at a temperature of 150 ° C. for 1 hour. The film thickness of the cured coating film was 10 μm.

Example 2 As an antibacterial agent, a titanium oxide powder carrying silver was prepared as follows. Titanium oxide powder (manufactured by Nippon Aerosil Co., Ltd .: trade name P-25) was dispersed in water so as to become an aqueous solution of 1% by weight (hereinafter referred to as%), and then 5% silver was added to the titanium oxide powder. Silver nitrate,
Ultraviolet rays were irradiated for 3 hours to support silver on the surface of the titanium oxide. Thereafter, drying was performed to obtain a titanium oxide powder supporting silver.

As in Reference Example 5, 60 parts of IPA organosilica sol was added to 100 parts of methyltrimethoxysilane,
After mixing 100 parts of isopropyl alcohol (IPA), 60 parts of water was added, stirred, and the molecular weight was adjusted to Mw = 950 in a 60 ° C. constant temperature bath. In this prepared liquid,
20 parts of the above titanium oxide powder carrying silver were added to obtain an antibacterial inorganic coating. The obtained antibacterial inorganic paint was applied to an alumina substrate washed with acetone, and dried at a temperature of 150 ° C. for 1 hour. The film thickness of the cured coating film was 10 μm.

Example 3 An antibacterial agent was prepared as follows. Tetraisopropoxide titanate was peptized with hydrochloric acid. The reaction was carried out at a mixing ratio of 2N hydrochloric acid: tetraisopropoxide titanate = 10: 1 (weight). This reaction liquid is preliminarily dispersed in water.
a) It was added to a 1% aqueous solution of montmorillonite (manufactured by Kunimine Industries Co., Ltd .: trade name: Knipia F), and titania was inserted between the clay layers. (Hereinafter, the one in which titania is inserted between the clay layers is referred to as PILC.) The composition ratio of this PILC was such that clay: titania = 1: 0.6 by weight. This PI
The LC was brought into contact with carbon dioxide in a supercritical state, and the solvent was extracted and removed to obtain a dry powder of PILC.

As in Reference Example 5, 60 parts of IPA organosilica sol was added to 100 parts of methyltrimethoxysilane,
After mixing 100 parts of isopropyl alcohol (IPA), 60 parts of water was added, stirred, and the molecular weight was adjusted to Mw = 950 in a 60 ° C. constant temperature bath. In this prepared liquid,
20 parts of the above dry powder of PILC was added to obtain an antibacterial inorganic coating. The obtained antibacterial inorganic paint was applied to an alumina substrate washed with acetone, and dried at a temperature of 150 ° C. for 1 hour. The film thickness of the cured coating film was 10 μm.

Example 4 An antibacterial agent was prepared as follows. Tetraisopropoxide titanate was peptized with hydrochloric acid. The reaction was carried out at a mixing ratio of 2N hydrochloric acid: tetraisopropoxide titanate = 10: 1 (weight). This reaction liquid is preliminarily dispersed in water.
a) It was added to a 1% aqueous solution of montmorillonite (manufactured by Kunimine Industries Co., Ltd .: trade name: Knipia F), and titania was inserted between the clay layers. (Hereinafter, the one in which titania is inserted between the clay layers is referred to as PILC.) The composition ratio of this PILC was such that clay: titania = 1: 0.6 by weight. This PI
A silver nitrate solution was added to the LC solution so that the silver content was 5% with respect to titania, and the mixture was irradiated with ultraviolet light for 3 hours to support silver on the titania surface. Then, it was brought into contact with carbon dioxide in a supercritical state, the solvent was extracted and removed, and a dry powder of PILC carrying silver was obtained.

As in Reference Example 5, 60 parts of IPA organosilica sol was added to 100 parts of methyltrimethoxysilane.
After mixing 100 parts of isopropyl alcohol (IPA), 60 parts of water was added, stirred, and the molecular weight was adjusted to Mw = 950 in a 60 ° C. constant temperature bath. In this prepared liquid,
20 parts of the dry powder of PILC supporting the silver was added,
An antibacterial inorganic paint was obtained. The obtained antibacterial inorganic paint was applied to an alumina substrate washed with acetone,
Dried for hours. The film thickness of the cured coating film was 10 μm.

Comparative Example 1 To 100 parts of methyltrimethoxysilane, 10 parts of tetraethoxysilane, 90 parts of IPA organosilica sol,
After mixing 30 parts of dimethyldimethoxysilane and 100 parts of isopropyl alcohol (IPA), 90 parts of water was added and stirred. This was adjusted to a weight average molecular weight (hereinafter, referred to as Mw) of 1500 in a thermostat at 60 ° C. to obtain an inorganic coating. The obtained inorganic paint was applied to an alumina substrate washed with acetone, and dried at a temperature of 150 ° C. for 1 hour. The film thickness of the cured coating film was 10 μm.

Examples 1 to 4 above, Comparative Example 1, Reference Example
The antibacterial properties of the coating films applied to the alumina substrates 1 to 5 were evaluated. For the evaluation, a solution containing a certain number of bacteria was dropped on an alumina substrate with a coating by a drop method, and the change in the number of bacteria at the initial stage and after 6 hours was measured. The bacterium used was Escherichia coli, and the measurement was performed under an illuminance of 3500 lux. The results were as shown in Table 1, and all Examples had good antibacterial effects. Especially,
The one in which titania was inserted between the clay layers had a high antibacterial effect.

Each of the antibacterial inorganic coatings of the examples could be baked at a temperature of 200 ° C. or less after application, and no cracks occurred in the coatings.

[0045]

[Table 1]

[0046]

The antibacterial inorganic coating composition of the present invention maintains antibacterial performance for a long period of time, can be baked at a temperature of 200 ° C. or lower, and has no cracks in the coating film due to its flexibility.

[0047] Claims 1 to 6 antibacterial inorganic coating according to any one of the present invention, the components having a photocatalytic function to the antimicrobial agent, and / or, a clay mineral oxide was intercalated between the layers having the photocatalytic function because it contains, the oxygen permeability of the inorganic coating enhances the antibacterial has higher antibacterial.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naoji Nakagawa 1048 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Works, Ltd. (72) Inventor Kazuo Seto 1048 Kadoma Kadoma, Kadoma City, Osaka Matsushita Electric Works (56) References JP-A-2-264074 (JP, A) JP-A-5-117590 (JP, A) JP-A-6-65527 (JP, A) JP-A-6-65012 (JP, A) JP-A-61 -83106 (JP, A) JP-A-7-126555 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C09D 1/00 C09D 5/14 C09D 183/00-183/12

Claims (6)

(57) [Claims] (A) a silicon compound represented by the general formula: Si (OR ¹ ) ₄ and / or colloidal silica ; and (b) a general formula: R ² Si (OR ¹ ) _3. silicon compounds, (iii) the general formula: R ² ₂ Si inorganic coating having the composition of (OR ¹⁾ a silicon compound represented by _2, and, in antibacterial inorganic coating composition containing an antimicrobial agent, silicon compound (b) And / or an organic solvent dispersible in which colloidal silica is dispersed in a non-aqueous organic solvent.
20 to 200 parts by weight of the colloidal silica, 100 parts by weight of the silicon compound of (b), and 0 to 60 parts by weight of the silicon compound of (c), and the weight average molecular weight of the inorganic coating containing them is Ri der 900 or more in terms of polystyrene, and, the antimicrobial agent, the antimicrobial containing a component having a photocatalytic function
An antibacterial inorganic paint characterized by being an agent . [The above R ¹ and R ² represent a monovalent hydrocarbon group. ] 2. A component having the above photocatalyst function of titanium oxide, zinc oxide, tin oxide, iron oxide, zirconium oxide,
Selected from the group consisting of tungsten oxide, chromium oxide, molybdenum oxide, ruthenium oxide, germanium oxide, lead oxide, cadmium oxide, copper oxide, vanadium oxide, niobium oxide, tantalum oxide, manganese oxide, cobalt oxide, rhodium oxide and rhenium oxide The antibacterial inorganic coating according to claim 1 , wherein the coating is at least one kind. As 3. <br/> antimicrobial agent containing the component having the above photocatalyst function, wherein the oxide having a photocatalytic function is a clay mineral which is intercalated between layers claim 1 or claim
Item 7. An antibacterial inorganic coating according to Item 2 . 4. The oxide having a photocatalytic function according to claim 3 , wherein the oxide is titanium oxide, zinc oxide, tin oxide, iron oxide, zirconium oxide, tungsten oxide, chromium oxide, molybdenum oxide, ruthenium oxide, germanium oxide, lead oxide, Cadmium oxide, copper oxide, vanadium oxide, niobium oxide,
The antibacterial inorganic coating according to claim 3 , wherein the coating is at least one selected from the group consisting of tantalum oxide, manganese oxide, cobalt oxide, rhodium oxide, and rhenium oxide. 5. A component having the photocatalytic function, or
The metal is supported on the oxide, wherein the metal is supported on the oxide.
1 to claim 4 antibacterial inorganic coating according to any one. 6. The method according to claim 5, wherein the metal is at least one selected from the group consisting of silver, copper, iron, nickel, zinc, platinum, gold, palladium, cadmium, cobalt, rhodium, and ruthenium. The antibacterial inorganic paint according to claim 5, wherein