JPH05309328A - Antibacterial metal sheet material and metal sheet - Google Patents

Abstract

PURPOSE:To obtain an antibacterial metal sheet material and a metal sheet which are highly safe to a human body and an environment as well as have almost no antibacterial activity lowering and also have an antibacterial activity persistence by applying a resin containing an antibacterial agent and a stainproofing agent added and mixed to the surface of a metal sheet to make a material for processing at a later stage. CONSTITUTION:This antibacterial steel sheet consists, for example, of a coating resin 2 of acrylic resin applied and dried on the surface of a 0.8mm-thick steel sheet 1. The coating resin 2 contains a stainproofing agent 4 consisting of a tetrafluoride resin powder with an average particle diameter of 15mum and an antibacterial agent particle 3 of silver silica gel. Thus, the antibacterial particle 3 added and mixed with the resin 2 prevents microbes from proliferating, and the stainproofing agent 4 added and mixed with the resin 2 prohibits the attachment of microbes. The abrasion of the surface of the resin 2 allows the antibacterial agent particle 3 and the stainproofing agent 4 to appear constantly on the surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial metal plate material and a metal plate on the surface of which a resin mixed with an antibacterial agent is mixed.

[0002]

2. Description of the Related Art Conventionally, steel sheet exteriors for household appliances and the like have been coated with a paint resin after the steel sheet has been cut or bent, but in recent years it has already been painted in order to improve its workability. The mainstream is to use coated steel sheets that have been cut and to perform processing such as cutting or bending on the coated steel sheets.

Since this coated steel sheet is coated and dried in advance on a steel sheet that has not been subjected to bending or the like, not only a uniform coating film can be obtained, but also the coating / drying process is small, which saves labor and costs. Is effective for.

[0004]

However, the microbial contamination of the surface of the coated steel sheet begins when the water containing the nutrient source and the microorganisms come into contact with the coated steel sheet, and further dust and the like adhere to the surface, which eventually leads to slimy skin. And the growth of fungi. As described above, in many cases, the coated surface of the coated steel sheet becomes a habitat for microorganisms, and improvement in cleanliness is demanded. Therefore, although many antibacterial agents have been proposed, there is a problem in that they are uncertain in terms of safety for the human body and the environment.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an antibacterial metal plate material and a metal plate capable of preventing microbial contamination and having high safety for human body and environment. It is a thing.

[0006]

According to the present invention of claim 1, an antibacterial property is a material in which a resin mixed with an antibacterial agent and an antifouling agent is formed on the surface of a metal plate and is a target of a subsequent processing step. It is a metal plate material.

The present invention according to claim 2 is an antibacterial metal plate in which a resin to which an inorganic antibacterial agent and an antifouling agent are added and mixed is formed on the surface of the metal plate.

The present invention of claim 3 is an antibacterial metal plate in which a water-repellent coating resin mixed with an inorganic antibacterial agent is coated on the surface of the metal plate.

[0009]

In the present invention, the antibacterial agent added and mixed to the resin prevents the growth of microorganisms, and the antifouling agent added and mixed to the resin is
Suppress the attachment of microorganisms.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments.

(Embodiment 1) FIG. 1 is a sectional view illustrating an antibacterial steel sheet according to an embodiment of the present invention. That is,
The antibacterial steel sheet is, for example, a 0.8 mm thick steel sheet 1 on which a coating resin 2 of acrylic resin is applied and dried, and the coating resin 2 contains silver silica gel antibacterial agent particles 3 and an average of An antifouling agent 4 made of tetrafluorinated resin powder having a particle size of about 15 μm is kneaded and added.

Next, a method of manufacturing the silver silica gel type antibacterial agent particles 3 and the antibacterial steel sheet will be described.

First, 100 parts by weight of a water-soluble silver salt such as silver acetate is added to and dissolved in water containing no chlorine, 450 parts by weight of a mixture of sodium sulfite and sodium bisulfite, and 300 parts by weight of a water-soluble salt of sodium thiosulfate. The parts were sequentially mixed with sufficient stirring and dissolved to obtain an aqueous silver complex salt solution. The weight of sodium thiosulfate is shown as the weight of its hydrate Na ₂ S ₂ O ₃ .5H ₂ O.

Silver silica gel type antibacterial agent particles 3 of the above embodiment
The carrier used for is the B-type silica gel powder described in "JIS Z 0701 Silica gel desiccant for packaging". This B-type silica gel powder is a silica gel powder having a low moisture absorption rate at low humidity, a high moisture absorption rate at high humidity, and a high total moisture absorption amount at high humidity, and its average particle size is about 8 μm.

The silica gel powder was dried at 180 ° C. for 2 hours or more. The thiosulfato silver complex salt aqueous solution was mixed with 100 parts by weight of the silica gel so that the silver component was 2 parts by weight. Then, the water absorbed in the solvent and the carrier was promptly removed. Then, this was pulverized to a predetermined particle size to obtain silica gel carrying an antibacterial material.

Next, 100 parts by weight of the silica gel was dispersed in a solution prepared by diluting 100 parts by weight of tetraethoxysilane with 100 parts by weight of ethyl alcohol as a coating material, and then 20 parts by weight of pure water was added thereto. The tetraethoxysilane was hydrolyzed and coated on at least part of the surface of the silica gel. Then, this was dried to obtain silver silica gel antibacterial agent particles 3.

3% of this silver silica gel type antibacterial agent particle 3
10% of the antifouling agent 4 was added to and mixed with the coating resin 2 on the steel plate 1 described above so as not to generate pinholes, and then dried at a temperature of about 210 ° C.

Table 1 shows the results of evaluation of the antibacterial performance of the surface of the coating resin 2 of the antibacterial steel sheet of the above-mentioned example manufactured with such a constitution.

[0019]

[Table 1]

Table 1 shows the numbers of bacteria on the surface of the coating resin under various conditions in the above-mentioned examples, the product containing only the antibacterial agent and the conventional product.

From these results, the antibacterial steel sheet of the above-mentioned embodiment was
Antibacterial property is exerted on the surface of the coating resin 2 and the cleanliness is maintained. An antibacterial agent-added product has an antibacterial effect at an early stage, but the effect is reduced due to the attachment of bacterial nutrient sources.

In the above embodiment, tetraethoxysilane was used to form the coating of the hydrolyzate of the silver silica gel antibacterial agent particles 3, but the present invention is not limited to this, and other tetraalkoxysilane such as tetramethoxysilane is used. May be

Further, in the above embodiment, the tetrafluorinated resin is used as the antifouling agent 4, but the antifouling agent 4 is not limited to this, and any other one may be used as long as it has an effect of reducing the contact area of water on the coating resin surface. ..

(Embodiment 2) FIG. 2 is a sectional view for explaining an antibacterial steel sheet of another embodiment. That is, for the antibacterial steel sheet, for example, the surface of the steel sheet 5 having a thickness of 0.8 mm is coated with an acrylic modified fluororesin coating film resin 6 and dried, and the coating film resin 6 contains silver silica gel antibacterial agent particles 7 and An antifouling agent 8 made of an oil having a trifluoride structure is kneaded and added to the end of the main chain. Here, the melting point of the antifouling agent 8 is lower than the drying temperature of the coating resin 6.

Next, a method of manufacturing the antibacterial steel sheet of Example 2 will be described.

A mixture of 3% of silver silica gel type antibacterial agent particles 7 and 0.5% of antifouling agent 8 is added to the acrylic modified fluororesin 6 and kneaded. When this is applied onto the steel plate 5 at 200 ° C. and dried, the melting point of the antifouling agent 8 is lower than the drying temperature of the coating resin 6, so the fluidity during resin drying is high and the polarity is lower than that of the resin. Therefore, bleeding out near the surface of the coating resin 6 improves the antifouling property of the surface of the coating resin 6.

Using the antibacterial steel sheet of Example 2 manufactured with such a constitution, a filter-shaped hole was formed, and bending was performed to form a grease filter.

The antibacterial performance of the surface of the grease filter was evaluated in the same manner as in Example 1. As a result, the antibacterial property was exhibited on the surface of the coating resin 6 and the cleanliness was maintained.

Although silica gel was used as the carrier in the above-mentioned Examples 1 and 2, the carrier is not limited to this, and another carrier such as zeolite may be used as long as it has a carrying ability.

In Example 2, the antifouling agent 8 used was an oil having a trifluoride structure at the end of the main chain. However, the antifouling agent 8 is not limited to this, and a carbon trifluoride structure such as a trifluoride structure at the end of the side chain is used. It may be a compound having

(Example 3) As a coating resin on the steel sheet of Example 2, an acrylic modified fluororesin, a fluorine-based resin having a high water repellency instead of an antifouling agent made of an oil having a trifluoride structure at the main chain end A grease filter having a coating film formed on a steel sheet was molded in the same manner as in Example 2 except that a resin was used. That is, as the coating resin, silver silica gel antibacterial agent particles are kneaded and added to a fluorine resin having high water repellency.

The antibacterial performance of the surface of the grease filter was evaluated in the same manner as in Example 1. As a result, the antibacterial property was exhibited on the coating film surface and the cleanliness was maintained.

In Example 3, the water-repellent coating resin used was a fluorine-based resin having high water repellency, but the water-repellent coating resin is not limited to this, and any other material can be used as long as it has an effect of reducing the contact area of water on the coating resin surface. Other resin may be used.

The antibacterial action of the antibacterial steel sheets of the above three examples will be described.

First, when the silver-based antibacterial agent in the coating resin on the steel plate is immersed in water or a large amount of water is dropped on the surface, the antibacterial component is leached from the coating resin to sterilize it. In addition to exerting the effect, the microbe in water exerts the bactericidal effect by contacting with the silver compound which is the antibacterial component of the silver-based antibacterial agent on the surface of the coating resin.

On the other hand, when a small amount of water is dropped on the coating resin surface or when the coating resin surface is in a wet state, the antifouling agent acts to reduce the water contact area of the coating resin surface. Exert.

Generally, when comparing the state of floating in water with the state of adherence to the vessel wall, it is said that the latter has a higher growth rate. From this fact, when water droplets adhere to the coating resin surface, it is possible to suppress the growth of microorganisms on the coating resin surface by reducing the area in contact with the coating resin surface and making it difficult for water droplets to also adhere. ..

The present invention has an antibacterial agent having a function of sterilizing by contacting microorganisms on the surface of the coating film resin based on the above principle, and an effect of increasing the contact angle of the surface of the coating film resin to suppress the adhesion and growth of microorganisms. The antifouling property is imparted to the coating resin by adding and mixing an antifouling agent (in Example 3, the same effect is realized by the coating resin having high water repellency).
In addition, the effect of making it difficult for the foreign matters inherent in the antifouling agent to adhere to the surface of the coating resin also exerts the effect of suppressing the adhesion of organic substances that are nutrient sources for microorganisms. Furthermore, even if the coating resin surface is abraded during continuous use, a new coating resin surface appears on the surface, and a new antifouling agent and antibacterial agent appear again on the surface, so antibacterial performance is less likely to deteriorate. .. In addition, since an inorganic antibacterial agent such as thiosulfato silver complex salt is highly safe for the human body and the environment, a highly safe antibacterial steel sheet can be realized.

In each of the above examples, the thiosulfato silver complex salt was used as the antibacterial agent, but the present invention is not limited to this, and other silver antibacterial agents may be used. Alternatively, for example, a copper-based or zinc-based inorganic antibacterial agent or another antibacterial agent may be used.

In each of the above embodiments, the coating resin is applied to the steel plate, but the invention is not limited to this and may be applied to other metal plates such as copper plates and aluminum plates.

[0041]

As is apparent from the above description, the present invention has the advantages that it can prevent microbial contamination and that it is highly safe for humans and the environment.

Further, since the antibacterial agent and the antifouling agent always appear on the surface against abrasion of the surface, there is an advantage that the antibacterial performance is less deteriorated and lasts longer.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating an antibacterial steel sheet according to an embodiment of the present invention.

FIG. 2 is a sectional view illustrating an antibacterial steel sheet according to another embodiment of the present invention.

[Explanation of symbols]

 1,5 Steel plate 2,6 Coating resin 3,7 Antibacterial agent particles 4,8 Antifouling agent

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Nishino 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Masaaki Yonemura 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (9)

[Claims] 1. An antibacterial metal plate material, wherein a resin to which an antibacterial agent and an antifouling agent are added and mixed is a material which is formed on the surface of the metal plate and is a target of a subsequent processing step. 2. An antibacterial metal plate, characterized in that a resin, to which an inorganic antibacterial agent and an antifouling agent are added and mixed, is formed on the surface of the metal plate. 3. An antibacterial metal plate characterized in that a water-repellent paint resin containing an inorganic antibacterial agent added and mixed is coated on the surface of the metal plate. 4. The antibacterial metal plate according to claim 1, 2 or 3, wherein the antibacterial agent is a silver antibacterial agent. 5. The antibacterial metal plate according to claim 4, wherein the silver-based antibacterial agent is a thiosulfato silver complex salt. 6. The antibacterial agent according to claim 1, 2 or 3, wherein at least a part of the surface of the silica gel carrying the silver thiosulfato complex salt is coated with a hydrolyzate of tetraalkoxysilane. Antibacterial metal plate. 7. The antibacterial metal plate according to claim 1, wherein the antifouling agent is a tetrafluorinated resin. 8. The antibacterial metal plate according to claim 1, wherein the antifouling agent is a compound having a carbon trifluoride structure in at least one of a side chain or a main chain terminal. 9. The antibacterial metal plate according to claim 1, wherein the antifouling agent is a compound whose melting point is equal to or lower than the molding temperature of the resin.