JPH10298459A - Antimicrobial coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antimicrobial deodorizing coating material which does not cause allergies, exhibits high sterilizing effects and safety, does not adversely affect human bodies and the living environments, and can be used satisfactorily in sick-house applications by incorporating a film-forming component and tea or a tea component into the same. SOLUTION: This coating material contains a film-forming component [such as a drying oil (e.g. linseed oil), an improved drying oil (e.g. maleic oil), a liq. synthetic resin (e.g. an unsatd. polyester), a natural phenol (e.g. raw urushi), a natural resin (e.g. rosin), a processed resin (e.g. ester gum), a solid synthetic resin (e.g. an alkyd resin), a cellulose deriv. (e.g. nitrocellulose), a rubber deriv. (e.g. a chlorinated rubber), or a water-soluble binder (e.g. casein)] and pulverized tea or a tea component (e.g. tea catechin. tea saponin, or tea tannin). A tea powder or a tea component is incorporated as an antimicrobial agent in an amt. of 1.0 wt.%, pref. 2.0-5.0 wt.%, of the film-forming component.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an antibacterial paint.

[0002]

2. Description of the Related Art As an antibacterial paint, a polyurethane paint composition containing a dispersed chitosan (Japanese Patent Laid-Open No. 3-231)
964) are known.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an antibacterial paint using a newly discovered antibacterial component.

[0004]

[Means for Solving the Problems] There are a wide variety of antibacterial and deodorant products in daily life-related products, but the main materials are chemical substances such as metal-containing inorganic, phenylamide and quaternary ammonium salts. is there. However, with the spread of these lifestyle-related products, there is a growing concern about the effects on the human body and the global environment.

[0005] The present inventors have already found that dyed garments made of tea and its extract have excellent antibacterial deodorant and antiallergic effects, and have applied for a patent in Japanese Patent Application No. 8-351739. It was also found that the antibacterial action of tea disappeared by heating. And it was confirmed that antibacterial properties can be imparted to the paint by blending the components of tea into the paint that cures or forms a film near room temperature without high temperature,
The present invention has been completed.

That is, the antibacterial paint of the present invention is characterized by containing a film-forming component and tea or a tea component. The tea or tea component is preferably tea catechin, tea saponin or tea tannin. The antibacterial paint of the present invention uses tea or a tea component widely used for drinking as a kind of luxury item as an antibacterial component. For this reason, it is extremely safe, and it can respond sufficiently to the effects on the human body and living environment, especially sick house measures, etc., and it has excellent antibacterial, deodorant, antiallergic paints that apply natural products. I can say.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The antibacterial paint of the present invention contains a film-forming component and tea or a tea component. The coating film forming component means a substance which is a main component of the coating film, which is the final purpose of the coating material. Specifically, liquid film-forming components such as linseed oil, drying oils such as eno oil, improved drying oils such as dehydrated castor oil and maleated oil, unsaturated polyesters, liquid synthetic resins such as synthetic lacquer, raw lacquer, cashew nut cells Natural phenols such as oils, solid film-forming components rosin, natural resins such as shellac,
Processed resins such as ester rubber and lime rosin, solid synthetic resins such as alkyd resins, acrylic resins and urethane resins, cellulose derivatives such as nitrocellulose and acetyl cellulose, rubber derivatives such as chlorinated rubber and cyclized rubber, polyvinyl alcohol, casein, etc. And the like. The antibacterial paint of the present invention may contain, in addition to these film-forming components, film-forming subcomponents such as plasticizers, curing agents, dispersants, and emulsifiers, and pigments. Ordinary paints can be used as they are as the coating film forming components of the present invention.

[0008] It should be noted that, as the film-forming component, those which are baked at a high temperature at which the tea or the tea component is deteriorated or those which react with the tea or the tea component to lose the antibacterial properties of the tea or the tea component cannot be used. Similarly, those which inhibit the antibacterial properties of tea or the tea component cannot be used as the film-forming auxiliary component. Examples of the film-forming component that inhibits the antibacterial properties of tea or tea components include thermosetting resins that are baked at a temperature exceeding 100 ° C.

The antimicrobial agent contains tea or a tea component. Tea and tea components are altered by heating and lose their antibacterial properties. For this reason, care must be taken to prevent exposure to high temperatures. Here, tea refers to tea leaves that are usually used as tea. This tea leaf may be pulverized into a powder, or the tea itself may be used as an antibacterial agent.
In addition, tea catechin, tea saponin, or tea tannin, which is a component of tea, in the form of powder or dissolved in an appropriate solvent can be used as the antibacterial agent. Further, fine powder of tea or powder obtained by adhering, adsorbing, and fixing tea components to a carrier may be used as an antibacterial agent. Further, a pulverized material obtained by adsorbing an active ingredient of tea to an organic substance, for example, a fiber by dyeing or the like is also effective. In addition, as a carrier, a clay mineral having a high adsorptivity, an inorganic substance such as zeolite which is a porous body,
Organic substances that impart granulation properties can be used.

[0010] The tea component is, for example, what is known as tea catechin, tea saponin or tea tannin. What is known as catechin, saponin, tannin is a general term for all organic substances with a specific organic structure,
Even if it is called catechin, if the raw material plant is different, the medicinal effect will be different. The catechin, saponin and tannin of the present invention are contained as components of tea, and do not contain catechin, saponin and tannin other than the components of tea. Also,
I do not know whether catechins, saponins, and tannins other than tea components have antibacterial properties.

The amount of the antibacterial agent is not particularly limited.
Depending on the purpose, the compounding amount of the antibacterial agent can be appropriately selected. The production method of the antibacterial paint of the present invention is obtained by adding and mixing at least one kind of tea catechin, saponin, tannin, tea powder and the like to the film-forming component.
Then, a coating film having antibacterial properties can be obtained by applying this coating material and drying and curing. The coating method and the drying / curing method may be conventional methods based on the characteristics of the components for forming the coating film.

If catechin, saponin, tannin, tea powder and the like of tea, which are the aforementioned antibacterial components, are added, antibacterial properties can be obtained. Practically, coating film 100 formed as a coating film
The amount of the antibacterial material is preferably 1.0 part by weight or more based on parts by weight. More preferably, it is about 2.0 to 5.0 parts by weight. In addition, the tea may be green tea or fermented black tea. Powdered tea may be added as it is or an extract may be added.

[0013]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the scope of the present invention is not limited thereto. (Example 1) 100 parts by weight of a polyol resin (trifunctional polyol, polypropylene glycol having a molecular weight of about 3000), an isocyanate resin (tolylene diisocyanate)
After mixing and mixing 130 parts by weight and 150 parts by weight of methylene chloride, 20.5 parts by weight of tea powder was added thereto, and the mixture was sufficiently stirred to prepare a clear urethane paint A.

A clear urethane paint B was prepared in the same manner as the clear urethane paint A, except that 20.5 parts by weight of 30% catechin-containing material was used instead of 20.5 parts by weight of the tea powder of the clear urethane paint A. Similarly, instead of 20.5 parts by weight of the tea powder of the clear urethane paint A, the same part by weight of catechin 90 was used.
% Urethane content and crude saponin were used to prepare clear urethane paint C and clear urethane paint D, respectively.

For comparison, a standard clear urethane paint comprising only the above-mentioned polyol resin, isocyanate resin and methylene chloride containing no tea components such as tea powder was prepared. Here, the tea powder refers to a powder containing 14.4% of catechin. A catechin 30% content refers to a 38% total polyphenol, of which 31% is contained as catechin. Catechin 90% content means 93.1% of total polyphenols, of which 70.5% is catechin.
%. The crude saponin is a powder obtained by defatting tea seeds, leaching with methanol, adding ether to a methanol solution, and drying a precipitate formed.

A clear urethane paint A, a clear urethane paint B, a clear urethane paint C, a clear urethane paint D, and a reference clear urethane paint are respectively brushed on the surface of the steel sheet, dried sufficiently, and then dried in a constant temperature dryer at 70 ° C. 2
It was left for 4 hours to cure. As a result, a transparent clear coating film was formed on the steel sheet. All of the coating films formed glossy transparent coating films.

Next, the antibacterial properties of these paints were examined by a partially improved bacterial growth inhibition test method. Sterile test cloth (100x vertical and horizontal thickness)
100x4mm acrylic fiber board), dipped in each paint, apply the paint on the entire surface of the acrylic board, dry it sufficiently, leave it in a constant temperature drier at 70 ° C for 24 hours, and cure it. A painted plate was obtained. Antibacterial properties were examined by a partially improved bacterial growth inhibition test. As the test bacterial solution, 3
Staphylococcus aureus stored at 7 ° C
One loopful of ATCC 6538 P) was inoculated into a normal broth medium, cultured at 37 ° C. for 8 hours with shaking (100 rpm), and the resulting culture was diluted 10-fold and then diluted 10-fold with PBS. What was further diluted 10 times with a bouillon medium was used. The number of bacteria at the time of dilution of this test bacterial solution is about 1 × 10
There are ^six .

Here, the ordinary broth medium refers to 50 g of beef extract, 10.0 g of peptone, and 5.0 g of sodium chloride.
Is dissolved in 1,000 ml of distilled water. Also,
PBS is a mixture of 34 g of potassium dihydrogen phosphate and 5 g of distilled water.
00ml, 4% sodium hydroxide aqueous solution about 175m
After adjusting the pH to 7.2 with 1 l, 11,000 with distilled water.
ml, and this was autoclaved at 121 ° C and 15 ° C.
It is one that has been sterilized by high-pressure steam for one minute.

Next, 0.075 ± 0.002 g was placed in a 50 ml screw-cap Erlenmeyer flask previously sterilized by high pressure steam (the amount of the sample was determined by grasping in advance the amount of the sample sufficiently immersed in 200 μl of the bacterial solution). Each coated plate sample cut so as to obtain
l was taken. The test flask thus obtained was cultured at 37 ° C. for 18 hours.

Then, 20 ml of PBS was added, and the cells were shaken 5 times × 5 times with a test tube mixer to disperse the cells. After dilution by a 10-fold serial dilution series, the number of cells was measured by the colony counting method. The number of bacteria at the start of the test was determined by dispersing the bacteria in PBS immediately after inoculating the coated plate sample and measuring the number of bacteria in the same manner.

The method for evaluating the antibacterial activity is as follows. From the number of colonies measured in each sample, the number of viable bacteria was determined as the number of viable bacteria = the number of colonies x 20 x dilution factor. The increase / decrease value of the bacteria and the difference between the increase / decrease values were calculated by the following formulas. Increase / decrease value = logC-logA Increase / decrease value difference = (logB−logA) − (logC−log
gA) Here, A is the number of inoculated bacteria, B is the number of bacteria of the unpainted coated plate, and C is the number of bacteria of the painted plate. Inoculation number [A] is 1.2x
10 ⁵ , logA was 5.1, the number of bacteria [B] of the unpainted coated plate was 3.5 × 10 ⁸ , and logB was 8.5.

Table 1 shows the number of bacteria (log C), increase / decrease value and difference between increase / decrease values of each coated plate. As shown in Table 1, the clear urethane paint B and the clear urethane paint C have significantly reduced bacterial counts and show excellent antibacterial properties. In addition, the clear urethane paint A and the clear urethane paint D also have a reduced bacterial count and exhibit antibacterial properties. This is due to the antibacterial action of the clear urethane paint A, clear urethane paint B, clear urethane paint C and clear urethane paint D, the tea powder, 30% catechin content, 90% catechin content, and crude saponin, which make the coating antibacterial. It is thought that it came to have.

Example 2 Nitrocellulose was dissolved in a lacquer to prepare a standard clear nitrocellulose coating.
Further, in this reference clear nitrocellulose paint, the amount of nitrocellulose contained therein was 100
2 parts by weight each of tea powder, 30% catechin content, 90% catechin content and crude saponin, which are the same antibacterial agents as described above, were added to clear nitrocellulose paint A, clear nitrocellulose paint B, clear nitrocellulose paint C and clear A nitrocellulose paint D was prepared.

Each of these five types of paints was brushed on the surface of the steel sheet and dried sufficiently to form a transparent clear coating film on the steel sheet. All of the coating films formed glossy transparent coating films. Next, these reference clear nitrocellulose paints, clear nitrocellulose paint A, clear nitrocellulose paint B, clear nitrocellulose paint C and clear nitrocellulose paint D were applied to the same acrylic fiber board as in Example 1, and then dried sufficiently. To form a coating film. The obtained five types of acrylic fiber boards were used in Example 1.
An antibacterial test was performed in the same manner as described above. The results of the antibacterial activity are shown in Table 2 as the increase / decrease value difference of the aforementioned bacteria.

[0025] As is clear from Table 2, as shown in the clear nitrocellulose paint B and the clear nitrocellulose paint C, the number of bacteria of the clear nitrocellulose paint containing 30% catechin and 90% catechin was reduced. However, in the clear nitrocellulose paint containing the tea powder and the crude saponin, the number of bacteria was not reduced.

Example 3 A commercially available clear acrylic paint (containing no pigment and using water as a solvent) was directly used as a reference paint. In this reference clear acrylic paint, the same antibacterial agent as in Example 1 was used for tea powder, catechin 30% content, and catechin 9 with respect to 100 parts by weight of the acrylic resin contained therein.
The clear acrylic paint A, the clear acrylic paint B, the clear acrylic paint C, and the clear acrylic paint D were prepared by mixing 2 parts by weight of the 0% content and the crude saponin, respectively.

Each of these five types of paints was brushed on the surface of the steel sheet and dried sufficiently to form a transparent clear coating film on the steel sheet. All of the coating films formed glossy transparent coating films. Next, these reference clear acrylic paints, clear acrylic paint A, clear acrylic paint B, clear acrylic paint C, and clear acrylic paint D were applied to the same acrylic fiber board as in Example 1, and then dried sufficiently to obtain a clear clear paint. The membrane was formed on an acrylic fiberboard. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. Table 3 shows the results of the antibacterial activity as the difference between the increase and decrease values of the aforementioned bacteria.

[0028] As is evident from Table 3, the clear acrylic paint B and the clear acrylic paint D have significantly reduced bacterial counts and show excellent antibacterial properties. Further, the clear acrylic paint A and the clear acrylic paint C also have a reduced bacterial count and exhibit antibacterial properties. This is due to the antibacterial effect of the tea powder, 30% catechin content, 90% catechin content and crude saponin blended in clear acrylic paint A, clear acrylic paint B, clear acrylic paint C and clear acrylic paint D It is thought that it came to have.

Example 4 A commercially available white acrylic paint (containing a white pigment and using water as a solvent) was used as a reference paint. In this reference white acrylic paint, tea powder, catechin 30% content, and catechin 90, which are the same antibacterial agents as in Example 1, were added to 100 parts by weight of the acrylic resin contained therein.
% Content and 2 parts by weight of crude saponin, respectively,
White acrylic paint A, white acrylic paint B, white acrylic paint C and white acrylic paint D were prepared.

Each of these five types of paints was brushed on the surface of the steel sheet and dried sufficiently to form a white acrylic coating film on the steel sheet. All of the coating films formed glossy white coating films. Next, these reference white acrylic paint, white acrylic paint A, white acrylic paint B, white acrylic paint C
The white acrylic paint D was applied to the same acrylic fiber board as in Example 1, and then sufficiently dried to form a white coating film on the acrylic fiber board. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. Table 4 shows the results of the antibacterial activity as the difference between the increase and decrease values of the aforementioned bacteria.

[0031] As is evident from Table 4, the number of bacteria of the white acrylic paint C is greatly reduced, indicating excellent antibacterial properties. Also,
The white acrylic paint A and the white acrylic paint B also show reduced antimicrobial activity and antibacterial properties. This is because the coating film became antibacterial due to the antibacterial action of tea powder, catechin 30% content, and catechin 90% content contained in white acrylic paint A, white acrylic paint B, and white acrylic paint C. it is conceivable that. In the white acrylic paint D containing the crude saponin, no decrease in the number of bacteria was observed.

(Example 5) A commercially available lacquer paint (containing natural and synthetic lacquer, no pigment) was used as a reference paint as it was. In this reference material paint, the material contained therein 1
The same antibacterial agent as in Example 1 containing 30% of catechin and 90% of catechin were added to each of 00 parts by weight.
Parts by weight were blended to prepare a brush paint B and a brush paint C. Each of these three types of paints was brushed on the surface of the steel sheet and dried sufficiently to form a coating film on the steel sheet. In each case, a glossy clear coating film could be formed.

Next, these reference brush paints, brush paint B
And the brush paint C was applied to the same acrylic fiber board as in Example 1, and then sufficiently dried to form a brush coating on the acrylic fiber board. The three types of acrylic fiber boards obtained were subjected to an antibacterial test in the same manner as in Example 1. The results of the antibacterial activity are shown in Table 5 as the number of bacteria, increase / decrease value and difference between increase / decrease values shown in Example 1.

[0034] As is evident from Table 5, all the paint films showed extremely strong antibacterial properties. A standard bran coating without an antibacterial agent shows the same strong antibacterial properties. From this, it is considered that the lacquer paint itself has strong antibacterial properties.

(Example 6) A commercially available clear thermoplastic acrylic resin coating for ordinary drying, Acrydec A-187 (Dainippon Ink and Chemicals) was used as a vehicle. 2 g of this vehicle was dissolved in 10 ml of thinner, and the resulting solution was used as it was as a reference paint. Further, the same antibacterial agent as in Example 1 such as tea powder, catechin 30% content, and 2 g of the vehicle of this example dissolved in 10 ml of thinner were added.
A clear acrylic paint A, a clear acrylic paint B, a clear acrylic paint C, and a clear acrylic paint D were prepared by blending 0.06 g of a 90% catechin-containing substance and one kind of crude saponin, respectively.

Each of these five types of paints was brushed on the surface of a steel sheet and dried sufficiently to form a transparent clear coating film on the steel sheet. All of the coating films formed glossy transparent coating films. Next, these reference clear acrylic paints, clear acrylic paint A, clear acrylic paint B, clear acrylic paint C, and clear acrylic paint D were applied to the same acrylic fiber board as in Example 1, and then dried sufficiently to obtain a clear clear paint. The membrane was formed on an acrylic fiberboard. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. The antimicrobial result is the number of bacteria mentioned above.
Table 6 shows C, the increase / decrease value of the bacteria, and the difference between the increase / decrease values of the bacteria.

[0037] As is clear from Table 6, the clear acrylic paint A containing the tea powder and the clear acrylic paint B containing the catechin 30% content have a greatly reduced number of bacteria and exhibit excellent antibacterial properties. The clear acrylic paint C containing a 90% catechin content slightly reduced the number of bacteria and showed a slight antibacterial property. In the clear acrylic paint D containing the crude saponin, no decrease in the number of bacteria was observed.

(Example 7) A clear thermoplastic acrylic resin paint for normal drying of a different company in place of the clear thermoplastic acrylic resin paint for ordinary drying of Example 6-ACIDEK A-187 (Dainippon Ink & Chemicals, Inc.) -Hitaroid 128C (Hitachi Chemical Industries) was used as the vehicle. In the same manner as in Example 6, a standard clear acrylic paint containing no antibacterial agent, a tea powder that is an antibacterial agent, a catechin 30% content, a catechin 90% content, and a clear acrylic paint A containing one of crude saponins, Clear acrylic paint B, clear acrylic paint C and clear acrylic paint D
Was prepared.

Each of these five paints was brushed on the surface of a steel sheet and dried sufficiently to form a transparent clear coating film on the steel sheet. All of the coating films formed glossy transparent coating films. Next, these reference clear acrylic paints, clear acrylic paint A, clear acrylic paint B, clear acrylic paint C, and clear acrylic paint D were applied to the same acrylic fiber board as in Example 1, and then dried sufficiently to obtain a clear clear paint. The membrane was formed on an acrylic fiberboard. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. The antimicrobial result is the number of bacteria mentioned above.
Table 7 shows C, the increase / decrease value of the bacteria, and the difference between the increase / decrease values of the bacteria.

[0040] As is clear from Table 7, the number of bacteria of the clear acrylic paint A containing tea powder and the clear acrylic paint B containing 30% catechin content and the clear acrylic paint C containing 90% catechin content are greatly reduced. It has excellent antibacterial properties. However, the clear acrylic paint D containing the crude saponin did not show a decrease in the number of bacteria.

Example 8 In place of the clear thermoplastic acrylic resin coating for ordinary drying of Example 6-Acrydec A-187 (Dainippon Ink and Chemicals), a transparent thermoplastic yellow acrylic resin for ordinary drying of another company. Paint-S-4060 (Toa Gosei) was used as a vehicle. And a standard transparent yellow acrylic paint containing no antibacterial agent in the same manner as in Example 6,
A transparent yellow acrylic paint A, a transparent yellow acrylic paint B, a transparent yellow acrylic paint C, and a transparent yellow acrylic paint D containing antibacterial agent tea powder, catechin 30% content, catechin 90% content, and crude saponin, respectively. Prepared.

Each of these five types of paints was brushed on the surface of a steel sheet and dried sufficiently to form a coating film on the steel sheet. All of the coating films formed glossy transparent yellow coating films. Next, these standard transparent yellow acrylic paint, transparent yellow acrylic paint A, transparent yellow acrylic paint B, transparent yellow acrylic paint C, and transparent yellow acrylic paint D were applied to the same acrylic fiber board as in Example 1, and then sufficiently dried. To form a transparent yellow transparent coating on an acrylic fiber board. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. Table 8 shows the results of the antibacterial activity as the number of bacteria logC, the increase / decrease value of the bacteria, and the difference between the increase / decrease values of the bacteria.

[0043] As is clear from Table 8, the transparent yellow acrylic paint A blended with tea powder, the transparent yellow acrylic paint B blended with 30% catechin content, and the transparent yellow acrylic paint C blended with 90% catechin content have bacterial counts. Significantly reduced, showing excellent antibacterial properties. In addition, a decrease in the number of bacteria was observed in the transparent yellow acrylic paint D containing the crude saponin.

(Example 9) Instead of the clear thermoplastic acrylic resin coating for ordinary drying-ACIDEK A-187 (Dai Nippon Ink Chemical Industry Co., Ltd.) of Example 6, an alkyd resin coating for ordinary drying-Veccosol ES5003-50 ( Dainippon Ink and Chemicals, Inc.) was used as a vehicle. In the same manner as in Example 6, a standard alkyd paint containing no antibacterial agent, tea powder as an antibacterial agent, alkyd paint A containing catechin 30% content, catechin 90% content, and alkyd paint each containing one kind of crude saponin B, alkyd paint C and alkyd paint D were prepared.

Each of these five paints was brushed on the surface of a steel sheet and dried sufficiently to form a coating film on the steel sheet. All of the coating films formed glossy transparent yellow coating films. Next, these reference alkyd paint, alkyd paint A, alkyd paint B, alkyd paint C and alkyd paint D were applied to the same acrylic fiber board as in Example 1,
Thereafter, it was sufficiently dried to form a transparent yellow transparent film on an acrylic fiber board. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. The results of the antibacterial activity are shown in Table 9 as the number of bacteria logC, the increase / decrease value of the bacteria, and the difference between the increase / decrease values of the bacteria.

[0046] As is clear from Table 9, all alkyd paints exhibited extremely strong antibacterial properties. Standard alkyd paints without antimicrobial agents also show the same strong antimicrobial properties. This suggests that the alkyd paint itself has strong antibacterial properties.

(Example 10) In place of the clear thermoplastic acrylic resin coating for ordinary drying-Acrydec A-187 (manufactured by Dainippon Ink & Chemicals, Inc.) of Example 6, urethane coating for ordinary drying (two-part) Hitaloid 3515 (Main agent: Acrylic polyol resin for urethane) and Coronate TD97 (Curing agent: Isotoanate resin) (Both Hitachi Chemical products)
And a mixture of main agent: hardener = 4: 1 was used as a vehicle. Then, in the same manner as in Example 6, 10 ml of a dedicated thinner was added to 2 g of the vehicle (main agent: 1.6 g, curing agent: 0.4 g), and completely dissolved to prepare a reference urethane paint containing no antibacterial agent. .

Further, the same antibacterial agent as in Example 1 such as tea powder, catechin 30% content, and catechin 90% was dissolved in a vehicle obtained by dissolving 2 g of the vehicle of this embodiment in 10 ml of thinner.
0.06 g of the content and one kind of crude saponin were blended, respectively, to prepare urethane paint A, urethane paint B, urethane paint C and urethane paint D. Each of these five types of paints was brush-coated on the surface of the steel sheet and dried sufficiently to form a coating film on the steel sheet. All of the coating films formed glossy transparent coating films.

Next, these reference urethane paint, urethane paint A, urethane paint B, urethane paint C and urethane paint D were applied to the same acrylic fiber board as in Example 1, and then dried sufficiently to form a transparent coating film. Formed on fiberboard. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. The results of the antibacterial activity are shown in Table 10 as the number of bacteria logC, the increase / decrease value of the bacteria, and the difference between the increase / decrease values of the bacteria.

[0050] As is clear from Table 10, the urethane paint A containing the tea powder and the urethane paint B containing the catechin content of 30% have a greatly reduced number of bacteria and exhibit excellent antibacterial properties. On the other hand, the urethane paint C containing 90% catechin and the urethane paint D containing crude saponin also showed a decrease in the number of bacteria.

(Example 11) An epoxy paint (two-pack) epototo YD014 for normal drying was used in place of the clear thermoplastic acrylic resin coating for ordinary drying-Acrydec A-187 (Dai Nippon Ink Chemical Industry) of Example 6. (Base resin: epoxy resin) and lacqueramide TD977 (curing agent: polyamide resin) (manufactured by Toto Kasei).
A 3: 1 mixture was used as vehicle. Then, in the same manner as in Example 6, 2 g of the vehicle (main agent: 1.5
g, curing agent: 0.5 g) and a special thinner of 10 m
Then, a reference epoxy paint completely dissolved and containing no antibacterial agent was prepared.

Further, 2 g of the vehicle of this example was dissolved in 10 ml of thinner, and the same antibacterial agent as in Example 1 such as tea powder, catechin 30% content, and catechin 90%
0.06 g of each of the contents and one kind of crude saponin were blended to prepare epoxy paint A, epoxy paint B, epoxy paint C and epoxy paint D. Each of these five types of paints was brush-coated on the surface of the steel sheet and dried sufficiently to form a coating film on the steel sheet. All of the coating films formed glossy transparent coating films.

Next, these standard epoxy paints, epoxy paint A, epoxy paint B, epoxy paint C and epoxy paint D were applied to the same acrylic fiber board as in Example 1, and then dried sufficiently to form a transparent paint film. Formed on fiberboard. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. The results of the antibacterial activity are shown in Table 11 as the number of bacteria logC, the increase / decrease value of the bacteria, and the difference between the increase / decrease values of the bacteria.

[0054] As is clear from Table 11, the epoxy paint B containing 30% catechin contains a significantly reduced number of bacteria, indicating excellent antibacterial properties. On the other hand, the epoxy paint C containing 90% catechin content also showed a decrease in the number of bacteria. However, the epoxy paint A containing the tea powder and the epoxy paint D containing the crude saponin did not show a decrease in the number of bacteria.

(Example 12) Commercially available alkyd resin paint for ordinary drying (milky white) -S326 (Dainippon Ink Chemical Industry Co., Ltd.) was used as a vehicle. 2 g of this vehicle was dissolved in 15 ml of distilled water by applying ultrasonic vibration, and the resulting solution was used as it was as a reference paint. Further, the same antibacterial agent as in Example 1 such as tea powder, 30% catechin-containing material, and 2 g of the vehicle of this example dissolved in 15 ml of distilled water,
A catechin 90% content and one kind of crude saponin are mixed at 0.06 g each and mixed sufficiently by applying ultrasonic vibration, and the alkyd paint A for normal drying, the alkyd coating B for normal drying, and the alkyd coating C for normal drying are added. And alkyd paint D for normal drying was prepared.

Each of these five types of paints was brushed on the surface of a steel sheet, and dried sufficiently to form a milky white film on the steel sheet. In each case, a glossy milky white film was formed. Next, these standard alkyd paint for normal drying, alkyd paint A for normal drying, alkyd paint B for normal drying, alkyd paint C for normal drying, and alkyd paint D for normal drying were applied to the same acrylic fiber board as in Example 1. Thereafter, it was sufficiently dried to form a transparent milky white film on an acrylic fiber plate. 5 obtained
An antibacterial test was performed on the various types of acrylic fiber boards in the same manner as in Example 1. The antibacterial result was determined by the number of bacteria logC,
Table 12 shows the increase and decrease values of the bacteria and the difference between the increase and decrease values of the bacteria.

[0057] As is evident from Table 12, in this paint, the coatings obtained from all the paints tested, including the paint containing no antibacterial agent, showed a greatly reduced bacterial count. It is determined that the vehicle component of this example has high antibacterial properties.

(Example 13) Instead of the alkyd resin of Example 12, an acrylic resin for ordinary drying (transparent) -S-744
(Dainippon Ink and Chemicals) was used as a vehicle. Then, in the same manner as in Example 12, a standard air-drying acrylic paint containing no antibacterial agent, a tea powder as an antibacterial agent, a catechin 30% content, a catechin 90% content, and a normal saponin containing one of crude saponins, respectively. An acrylic paint A, an acrylic paint for normal drying B, an acrylic paint for normal drying C, and an acrylic paint for normal drying D were prepared.

Each of the five paints was brushed on the surface of the steel sheet and dried sufficiently to form a transparent clear coating film on the steel sheet. All of the coating films formed glossy transparent coating films. Next, these standard acrylic paints for normal drying, acrylic paints A for ordinary drying, acrylic paints B for ordinary drying, acrylic paints C for ordinary drying, and acrylic paints D for ordinary drying were applied to the same acrylic fiber board as in Example 1, Thereafter, it was sufficiently dried to form a transparent clear coating film on the acrylic fiber board. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. The antimicrobial result is the number of bacteria mentioned above.
Table 13 shows C, the increase / decrease value of the bacteria, and the difference between the increase / decrease values of the bacteria.

[0060] As is clear from Table 13, acrylic paint A for normal drying containing tea powder, acrylic paint B for normal drying containing 30% catechin content, and acrylic paint C for normal drying containing 90% catechin content, The acrylic paint D for normal drying containing the crude saponin showed a decrease in the number of bacteria. In particular, the acrylic paint C for normal drying containing a 90% catechin-containing substance had a greatly reduced number of bacteria and exhibited excellent antibacterial properties.

(Example 14) An aqueous urethane resin dispersion (transparent) instead of the alkyd resin of Example 12
-L-55 (Dainippon Ink & Chemicals, Inc.) was used as a vehicle. Then, in the same manner as in Example 12, a standard aqueous urethane paint containing no antibacterial agent, a tea powder as an antibacterial agent, a catechin 30% content, a catechin 90% content, and an aqueous urethane paint A each containing one kind of crude saponin, Water-based urethane paint B, water-based urethane paint C and water-based urethane paint D were prepared.

Each of these five types of paints was brush-coated on the surface of the steel sheet and dried sufficiently to form a transparent clear coating film on the steel sheet. All of the coating films formed glossy transparent coating films. Next, these standard water-based urethane paints, water-based urethane paints A, water-based urethane paints B, water-based urethane paints C and water-based urethane paints D were applied to the same acrylic fiber board as in Example 1, and then dried sufficiently to obtain a clear clear coating. The membrane was formed on an acrylic fiberboard. An antibacterial test was performed on the obtained five types of acrylic fiber boards in the same manner as in Example 1. Table 14 shows the results of the antibacterial activity as the number of bacteria logC, the increase / decrease value of the bacteria, and the difference between the increase / decrease values of the bacteria.

[0063] As is clear from Table 14, both the aqueous urethane paint B containing the catechin 30% content and the aqueous urethane paint C containing the catechin 90% content showed a decrease in the number of bacteria. However, no decrease in the bacterial count was observed in the aqueous urethane paint A containing the tea powder and the aqueous urethane paint D containing the crude saponin.

[0064]

The antibacterial paint of the present invention exhibits high sterility. The antibacterial component of the antibacterial paint of the present invention is tea and a medicinal component contained in tea. Needless to say, the tea itself is used for drinking and is highly safe. The antibacterial paint of the present invention using the tea or the tea component can impart antibacterial properties to furniture, a wall surface of a house, daily necessities, and the like when used by humans, and has a large sanitary effect.

Claims (2)

[Claims] An antibacterial paint comprising a film-forming component and tea or a tea component. 2. The antibacterial paint according to claim 1, wherein said tea component is tea catechin, tea saponin or tea tannin.