JP5367975B2 - Method for producing coated aluminum sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating film applied aluminum plate enhanced in anti-bacterial and anti-fungal properties without damaging hydrophilicity and coating film close adhesiveness. <P>SOLUTION: The manufacturing method of the coating film applied aluminum plate includes the process of coating an aluminum plate with a resin coating solution containing an organic resin comprising at least one kind of a polyvinyl alcohol resin, an acrylic resin and a cellulosic resin and an organic anti-bacterial agent and an anti-fungal agent and the process of performing the baking treatment of the aluminum plate coated with the resin coating solution so that the surface temperature of the aluminum plate becomes a temperature within a range of T-T+100(&deg;C) when the melting temperature or decomposing temperature of the anti-bacterial and anti-fungal agent is set to T(&deg;C). <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a method for producing a coated aluminum sheet for use in, for example, household electrical appliances and building materials, and particularly relates to a method for producing a coated aluminum sheet having antibacterial and antifungal properties.

  Aluminum plates or aluminum alloy plates have advantages such as light weight and excellent workability, and thus are used in various applications such as household electrical appliances and building materials. In these applications, building interior materials used in humid places such as bathrooms and kitchens, outer panels of water handling equipment such as electric washing machines, or air conditioning exposed to moisture generated during cooling operation When used as a constituent material of a heat exchanger for a machine, conditions are easily generated that cause sputum and germs.

Hereinafter, the problem will be described by taking an aluminum plate or an aluminum alloy plate used for a heat exchanger for an air conditioner as an example. (Hereinafter, pure aluminum and aluminum alloys are collectively referred to as “aluminum” in this specification.)
When the air conditioner heat exchanger is cooled, moisture in the air adheres to the surface of the aluminum fin material as condensed water. In general, since the surface of the metal material is poor in hydrophilicity, the condensed water adheres in a semicircular shape to the surface of the fin material or exists in a bridge shape between the fin materials. Such condensed water hinders the flow of air between the fin materials, increases ventilation resistance, and causes a decrease in heat exchange efficiency.

  In particular, recent heat exchangers for air conditioners are required to have improved thermal efficiency and compactness in order to reduce weight, and since the design of the fin spacing as narrow as possible has been adopted, the condensed water is placed between the fins. The above problem becomes more prominent due to the presence of a bridge.

  As a method for quickly eliminating condensed water adhering to the surface of the fin material, (1) a method of forming a highly hydrophilic film on the surface of the aluminum fin material and allowing the condensed water to flow down as a thin water film, (2) aluminum fins A method of forming a water-repellent film on the surface of the material and preventing condensed water from adhering to the surface can be considered, but the method (2) is extremely difficult with the current technology. On the other hand, the method (1) prevents the condensed water from forming condensed water droplets on the surface of the aluminum fin material due to the hydrophilicity, and the condensed water forms a thin water film and covers the surface of the fin material.

Various methods for forming hydrophilicity on the aluminum plate surface have been proposed. For example, a method of forming an alkali silicate lubricating film on the surface of an aluminum material (Patent Document 1), and forming a hydrophilic / lubricating film containing a water-based paint resin, a surfactant and synthetic silica on the surface of a heat exchanger (Patent Document 2), applying a composition containing a low-molecular organic compound having an alkali silicate and a carbonyl compound and a water-soluble organic polymer to an aluminum material to form a hydrophilic / lubricating film There is a method (Patent Document 3).
Japanese Patent Publication No. 53-048177 JP 55-164264 A JP-A-60-101156

  However, in the method of forming the lubricating coating of the alkali silicate, the hardness of the lubricating coating is high, so that when the aluminum plate on which the coating is formed is processed into fins, the mold is worn and the processed fin material There is a problem that cracks are likely to occur. In addition, with this method, it has been difficult to maintain the hydrophilicity of the fin material surface over a long period of time.

There has also been proposed a paint capable of forming a lubricious coating that does not cause mold wear and occurrence of cracks in the fin material (Patent Documents 4 to 6). Examples of such a coating composition include hydrophilic coating compositions containing water-soluble hydrophilic resins such as polyvinyl alcohol resins, polyacrylamide resins, polyacrylic resins, and cellulose resins.
JP 63-173632 A Japanese Patent Laid-Open No. 05-302042 JP 09-014889 A

  By the way, in the heat exchanger for air conditioners, in addition to the fact that dew condensation is likely to occur on the fin surface, there is an environment in which dust, soot, bacteria, and the like are likely to be generated due to air passing between the fins. Once bacteria and sputum occur, problems such as unpleasant odors and allergies arise. In order to cope with such a problem, it is known that an antibacterial / antifungal material is contained in the precoat film provided on the aluminum plate for fins. However, when an inorganic antibacterial / antifungal agent is contained in the precoat film, the sterilizing ability is low, and it is difficult to suppress the propagation of moths and germs. On the other hand, when an organic antibacterial / antifungal agent is used, it is difficult to disperse it in the precoat film because the antibacterial / antifungal agent is insoluble. Even when the antibacterial / antifungal agent is dispersed in the coating using a dispersant, the antibacterial / antifungal agent may be dissolved by condensed water adhering to the surface of the fin material during use of the heat exchanger. It was difficult to maintain antibacterial and antifungal performance.

  In view of the above problems, the present invention improves antibacterial and antifungal properties without impairing hydrophilicity and coating film adhesion in a coated aluminum sheet requiring hydrophilicity such as fin materials for heat exchangers. It was made as an issue.

The method for producing a coated aluminum sheet of the present invention that solves the above problems is as follows.
An organic antibacterial material consisting of an organic resin made of at least one of polyvinyl alcohol resin, acrylic resin or cellulose resin and zinc bis [1,2-dihydro-2-thioxopyridine-1-olate] on an aluminum plate Applying a resin coating solution containing an antifungal agent;
When the melting point or decomposition temperature of the antibacterial / antifungal agent is T (° C.) on the aluminum plate coated with the resin coating solution, the plate surface temperature is 30 seconds or less at a temperature in the range of T to T + 100 (° C.). So that the baking process is performed,
A process for producing a coated aluminum sheet comprising a coating film.

  It is more preferable that the blending ratio (weight) of the organic resin and the organic antibacterial / antifungal agent in the resin coating solution is 100: 1 to 100: 400.

  More preferably, the solvent in the resin coating solution is water.

  More preferably, the total amount of the organic resin and the organic antibacterial / antifungal agent is 100 parts by weight, and the solvent in the resin coating solution is 250 to 2000 parts by weight.

  The coating film-coated aluminum of the present invention is excellent in hydrophilicity and coating film adhesion, and can maintain excellent antibacterial and antifungal properties over a long period of time.

1. Aluminum plate As an aluminum plate used for the coating film-coated aluminum plate of the present invention, those subjected to a pretreatment or a corrosion-resistant ground treatment as necessary can be used. Examples of the pretreatment include water washing, hot water washing, pickling, alkali degreasing, grinding, polishing and the like. Examples of the coating provided by the corrosion-resistant ground treatment include a chemical conversion coating, a corrosion-resistant organic coating, an anodized coating, and a boehmite coating. Any corrosion resistant coating may be used, but from the viewpoint of corrosion resistance, coating adhesion and economy, it is particularly preferable to use a chemical conversion coating or an organic corrosion resistant coating.

Examples of the chemical conversion coating include a chromium-based, zirconium-based, or titanium-based chemical conversion coating, and a chromium-based chemical conversion coating is particularly preferable from the viewpoint of corrosion resistance and coating adhesion. Examples of the method for forming the chemical conversion coating include a coating type, an electrolytic type, and a reactive type, and any of them may be used, but the coating type is excellent in film adhesion, corrosion resistance, and plate formability after chemical conversion. The chromate method is particularly preferred. When the coating type chromate method is used, the coating amount is suitably ² to 50 mg / m ^{2 in} terms of metallic Cr. If the coating amount is less than 2 mg / m ² , sufficient corrosion resistance and film adhesion may not be obtained, and if it exceeds 50 mg / m ² , the degree of improvement in corrosion resistance and film adhesion is saturated. A particularly preferable coating amount is 5 to 15 mg / m ² in terms of metallic Cr.

When forming a corrosion-resistant organic film as a base film, a resin film made of acrylic resin, urethane resin, epoxy resin, polyester, or the like can be used. Any resin coating may be used as long as it is not impaired. The formation amount of the corrosion-resistant organic coating is suitably 0.1 to 10 g / m ² , more preferably 0.5 to 5 g / m ² . If it is less than 0.1 g / m ² , sufficient corrosion resistance may not be obtained, and if it exceeds 10 g / m ² , the degree of improvement in corrosion resistance is saturated.

2. Resin coating solution A baking type resin coating solution is applied to an aluminum plate subjected to the above pre-treatment or corrosion-resistant base treatment as necessary in order to form a hydrophilic film. This resin coating solution is composed of a solvent, an organic resin, and an organic antibacterial / antifungal agent. As an organic resin, what consists of at least 1 type of a polyvinyl alcohol-type resin, an acrylic resin, or a cellulose resin is used. As the organic antibacterial / antifungal agent, those composed of zinc bis [1,2-dihydro-2-thioxopyridine-1-olate] or 2- (4-thiazolyl) -1H-benzimidazole are used. The film thickness of the organic resin to be applied is not particularly limited, but is preferably 0.01 μm in order to sufficiently obtain hydrophilicity and antibacterial / antifungal properties. The degree of improvement in sex is saturated. A more preferable coating film thickness is 0.1 to 1.5 μm.

  You may add the following additives to the said resin coating solution as needed. That is, tannic acid, gallic acid, phytic acid, phosphinic acid, or the like may be added as a rust inhibitor, and polyalcohol alkyl esters, polyethylene oxide condensate, or the like may be added as a leveling agent. Moreover, fillers, such as polyacrylamide and polyvinyl acetamide, which are added within a range that does not impair the compatibility, may be added, and colorants such as phthalocyanine compounds may be added. Moreover, you may add alkyl sulfate ester salt, alkyl sulfosuccinate type | system | group, etc. as surfactant. In addition, inorganic oxides such as carbon black, zinc oxide, silicon oxide (silica), aluminum oxide (alumina), and titanium oxide can also be added.

  When an acrylic resin is used as the organic resin that constitutes the resin coating solution, a copolymer or block polymer of an α, β monoethylenically unsaturated monomer and a monomer polymerizable thereto, or α , A resin composed of a polymer of a β-monoethylenically unsaturated monomer itself can be used. Examples of α, β monoethylenically unsaturated monomers include acrylic acid esters (methyl acrylate, ethyl acrylate, isopropyl acrylate, nbutyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, acrylic acid Isooctyl, 2-ethylbutyl acrylate, octyl acrylate, methoxyethyl acrylate, ethoxyethyl acrylate, ethoxypropyl acrylate, etc.); methacrylates (methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, butyl methacrylate, Isobutyl methacrylate, n-hexyl methacrylate, lauryl methacrylate, decyl octyl methacrylate, stearyl methacrylate, 2-methylhexyl methacrylate, 3-methoxybutyl methacrylate, etc.); acrylonitrile; Examples include acrylonitrile, vinyl acetate, vinyl chloride, vinyl ketone, vinyl toluene, and styrene. Monomers that can be copolymerized with the α, β monoethylenically unsaturated monomers include styrene, α-methylstyrene, vinyltoluene, t-butylstyrene, ethylene, toluene, propylene, acrylamide, and hydroxypropyl acrylate. , 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, N-methylolacrylamide, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid and the like are used.

  When a polyvinyl alcohol-based resin is used as the organic resin constituting the resin coating solution, those having a saponification degree of 90 mol% or more are preferably used, and particularly, a completely saponified polyvinyl alcohol (PVA) is preferably used. From the viewpoint of the degree of polymerization, PVA having an average degree of polymerization of preferably 500 to 4000, more preferably 1500 to 2500 is suitably used. If the degree of saponification is less than 90 mol% or the average degree of polymerization is less than 500, the hydrophilicity of the coated aluminum sheet may be insufficient. On the other hand, if the average degree of polymerization is greater than 4000, the viscosity increases remarkably, and roping or the like may occur during coating, and a uniform film may not be formed. As such a polyvinyl alcohol-based resin, in addition to the above PVA, for example, a small amount (for example, 5% by weight or less) of allyl glycidyl ether was copolymerized at the time of polymerization of vinyl acetate, and a part of the hydroxyl group was substituted with an epoxy group. A carboxyl group is introduced into the main chain by copolymerizing monomers having a carboxyl group such as crotonic acid, acrylic acid, maleic anhydride, itaconic acid, MMA (methyl methacrylate), etc. Modified polyvinyl alcohol or the like can also be used.

  When a cellulose resin is used as the organic resin constituting the resin coating solution, the type is not particularly limited, but those having a weight average molecular weight in the range of 5,000 to 700,000 are preferable. Those having a weight average molecular weight in the range of 10,000 to 500,000 are particularly preferred. If the weight average molecular weight is less than 5,000, the corrosion resistance of the coated aluminum sheet may be insufficient. If it exceeds 700,000, the formability of the coated aluminum sheet may be insufficient. Suitable types of cellulose resin include acetyl cellulose, cellulose propionate, cellulose butyrate, nitrocellulose, methylcellulose, carboxymethylcellulose and the like.

  In addition, it is good also as a crosslinkable resin of a three-dimensional arrangement | sequence by mixing a crosslinking agent with the organic resin raised above as needed, for the purpose of improving the water-soluble solubility of a coating film. Examples of such a crosslinking agent include metal chelate compounds such as melamine resin, urea resin, phenol resin, polyepoxy compound, blocked polyisocyanate compound, and titanium chelate.

3. Organic antibacterial / antifungal agent An organic antibacterial / antifungal agent is added to the resin coating solution described above in order to impart antibacterial / antifungal properties to the coated aluminum sheet. As the active ingredient of the antibacterial / antifungal agent, either one having antibacterial properties or one having antifungal properties may be used, but the use of both is more effective. Examples include organic components such as isothiazoline, aldehyde, benzimidazole, halogen, carboxylic acid, sulfamide, thiazole, triazole, phenol, phthalimide, naphthenic acid, pyridine, Among them, zinc bis [1,2-dihydro-2-thioxopyridine-1-olate] (zinc pyrithione) does not impair the hydrophilicity of the coated aluminum plate, and is excellent in water insolubility and thermal stability. Are particularly preferred.

  The antibacterial / antifungal agent is contained in an amount of 1 to 400 parts by weight, preferably 5 to 50 parts by weight, based on 100 parts by weight of the organic resin. If the amount is less than 1 part by weight, the antibacterial / antifungal agent may be insufficient and sufficient antibacterial / antifungal properties may not be obtained. On the other hand, if the antibacterial / antifungal agent exceeds 400 parts by weight, the hydrophilicity of the coating film may be impaired when the coating film-coated aluminum plate is formed into a fin material or the like, so that it cannot be used as a finning agent. There is.

In order to mix an antibacterial / antifungal agent in the resin coating solution, an organic resin, an antibacterial / antifungal agent, and various additives added as necessary are dissolved and dispersed in a solvent. The solvent is not particularly limited as long as each component can be dissolved or dispersed. For example, an aqueous solvent such as water, a ketone solvent such as acetone, an alcohol solvent such as ethanol, ethylene glycol monoethyl ether, and the like. Of ethylene glycol alkyl ether solvents such as diethylene glycol alkyl ether solvents such as diethylene glycol monobutyl ether, propylene glycol alkyl ether solvents such as propylene glycol monomethyl ether, and a series of glycol alkyl ether solvents such as ethylene glycol monoethyl ether acetate. An esterified substance etc. are mentioned, Among these, an aqueous solvent is preferable and water is especially preferable.
In the resin coating solution, the total amount of the organic resin and the antibacterial / antifungal agent is preferably 100 parts by weight, and the solvent in the resin coating solution is preferably 250 to 2000 parts by weight. When the solvent content is less than 250 parts by weight, there is a problem that the viscosity of the paint is high and it becomes impossible to form a coating film uniformly. On the other hand, when the content of water exceeds 2000 parts by weight, one time is required. Since the amount of coating obtained by this coating is reduced, it is necessary to apply the coating many times in order to obtain a predetermined coating, and there is a problem that the economy is greatly impaired.

  A resin coating solution containing the antibacterial / antifungal agent described above may be applied to an aluminum plate to form a hydrophilic coating film, and then a lubricating coating film mainly composed of a polyethylene glycol resin may be formed. Thereby, the formability of the coating film-coated aluminum plate can be improved. The lubricating coating may contain an additive in addition to the polyethylene glycol resin as the main component.

  In order to form a hydrophilic film and a lubricious film, methods such as a roll coater method, a roll squeeze method, a chemi coater method, an air knife method, a dipping method, a spray method, and an electrostatic coating method are used. The roll coater method is preferred because of its excellent productivity and good productivity. As the roll coater method, a gravure roll method with easy coating amount management, a natural coating method suitable for thick coating, a reverse coating method suitable for imparting an aesthetic appearance to the coated surface, and the like can be employed.

4). Baking treatment After forming a hydrophilic coating and a lubricating coating formed on the hydrophilic coating, a baking treatment is performed. The baking treatment is performed so that the melting point or decomposition temperature of the antibacterial / antifungal agent is T (° C.) and the plate surface temperature is in the range of T to T + 100 (° C.). By keeping in the above temperature range, the antibacterial / antifungal agent dispersed in the resin coating solution becomes higher than the melting point or decomposition temperature, so it melts in the resin coating solution and remains strong in the film as it cools. And evenly dispersed. Antibacterial and antifungal agents that are firmly retained and dispersed in hydrophilic coatings have long-term antibacterial and antifungal properties even when the coated aluminum plate is used in an environment with a lot of moisture. it can. When the surface temperature of the plate during baking is lower than the above temperature T (° C.), the antibacterial / antifungal agent is not uniformly dispersed in the hydrophilic coating, and long-term antibacterial / antifungal properties are obtained. I can't. On the other hand, when the baking temperature exceeds T + 100 (° C.), the resin coating is deteriorated, resulting in a loss of coating film adhesion. In addition, this baking process is a process of adjusting and adjusting the amount of solvent as necessary, and in order to remove the solvent step by step, the drying process is partitioned (for example, a plurality of heating chambers each set at different temperatures). It may be prepared and heated stepwise while sequentially moving the samples to be baked).
For example, when zinc bis [1,2-dihydro-2-thioxopyridine-1-olate] is used as an antibacterial / antifungal agent, the decomposition temperature is 240 ° C., so that baking is performed at a plate surface temperature of 240 to 340. Perform in the range of ° C.

The method for controlling the temperature to the above-described plate surface temperature in baking is not particularly limited, and examples thereof include a method of bringing an aluminum plate into contact with a temperature control roll and a method of blowing a gas whose temperature is controlled. In the case of the method of blowing the gas whose temperature is controlled, the air volume is preferably 1 to 500 m ³ / min. The baking time is not particularly limited, but is particularly preferably 1 to 60 seconds.

  The coating-coated aluminum plate produced as described above is applied with volatile press oil for press forming on the surface, and then subjected to forming processing such as slit processing and corrugation processing to obtain a desired fin shape. It can be set as the coating-coated aluminum plate which consists of. Such a coating-coated aluminum plate is suitably used as a fin material of a heat exchanger for an air conditioner, but is limited to the use of an air conditioner heat exchanger if it is necessary to prevent condensation between the fin materials. Is not to be done.

〔Example〕
Hereinafter, although an example is given and explained about details of the present invention, the range of the present invention is not limited by this example.

As an aluminum plate, JIS1100-H24 material (0.100 mm thickness) was prepared, weakly alkaline degreased, washed with water, and dried. The surface of this aluminum plate was treated with a coating chromate (SAT427 manufactured by Nippon Paint Co., Ltd.), and baked at 180 ° C. for 10 seconds to form a chromate-based chemical conversion coating having a coating amount of 10 mg / m ^{2 in} terms of metallic Cr as a base coating. .

A resin paint solution prepared by dissolving an organic resin and an antibacterial / antifungal material in water as a solvent was prepared as paints 1 , 4 to 12. As the resin coating solution and the organic resin, any of acrylic resin, PVA, and cellulose resin was used. In addition, antibacterial / antifungal agent A (zinc bis [1,2-dihydro-2-thioxopyridine-1-olate]) and antibacterial / antifungal agent D (silver fine particles) Either was used. (However, antibacterial / antifungal agent D was used only as a comparative example.) Table 1 shows the combinations of organic resins and antibacterial / antifungal agents in paints 1 and 4 to 12 and their contents.

The coatings 1 and 4 to 12 were applied to the aluminum plate on which the base coating was formed as described above with a roll coater, and then baked at various temperatures to form the coating-coated aluminum plate shown in Table 2 (present invention) Examples 1 and 4 to 14 and Comparative Examples 1 to 5) were obtained. These coating-coated aluminum plates were pretreated as follows to obtain test materials. That is, each sample was taken out after being immersed in volatile press oil (Daphni-2A manufactured by Idemitsu Kosan Co., Ltd.) for 1 minute, and was removed by holding each sample vertically for 30 seconds at room temperature. Next, it was placed in a 180 ° C. hot air furnace (atmosphere) and held for 2 minutes, and then cooled to room temperature.

  These test materials were evaluated for hydrophilicity and antibacterial / antifungal properties as follows.

  [Evaluation of Hydrophilicity] Each specimen was evaluated for hydrophilicity by measuring the contact angle of water (pure water) with a goniometer. Further, the contact angle measurement was also performed for those subjected to a wet and dry cycle thereafter. In the wet and dry cycle, the coating-coated aluminum plate sample was immersed in tap water at a flow rate of 1 liter / min for 8 hours and then dried at 80 ° C. for 16 hours, and this was repeated 20 cycles.

The results of evaluating hydrophilicity are shown in Table 3. The meanings of the symbols of the evaluation results are as follows.
◎ The contact angle is 20 ° or less, and the hydrophilicity is very good.
○ The contact angle exceeds 20 ° and is 30 ° or less, and the hydrophilicity is good.
Δ: The contact angle exceeds 30 ° and is 40 ° or less, and the hydrophilicity is poor.
× The contact angle exceeds 40 °, which is very poor.

以上

that's all

[Evaluation of coating film adhesion]
Each specimen was subjected to an adhesion test according to JIS H4001, and the number of remaining pieces after tape peeling at the grid was measured. The case of 100/100 (100 remaining in 100 grids) was regarded as acceptable. The evaluation results are shown in Table 3.

[Evaluation of antibacterial properties]
An antibacterial test (film adhesion method) according to JIS Z2801 was performed on each sample material and the sample material immersed in pure water for 48 hours, and an antibacterial activity value R was obtained using the following formula.

R = log (A / B)
However, A is an average number of viable cells after culturing a blank test piece, and B is an average number of viable cells after culturing an antibacterial processed test piece. The evaluation results are shown in FIG. The meanings of the symbols in the evaluation results are as follows: ○ R is 2.0 or more, which is good.
X R is less than 2.0, which is bad.

[Evaluation of antifungal properties]
About each test material and the test material which immersed this in the pure water for 48 hours, the fungi resistance test according to JISZ2801 was done, and the growth condition of the mycelium was investigated with the naked eye. This evaluation result is also shown in Table 3. The meanings of the numbers in the evaluation results are as follows, and 3 was accepted.
3: Mycelial growth is not observed in the contacted part of the sample.
2: The area of the growth part of the mycelium recognized in the contacted part of the sample does not exceed 1/3 of the total surface area.
1: The area of the growth part of the mycelium recognized in the contacted part of the sample exceeds 1/3 of the total surface area.

  As shown in Table 2, the coated aluminum sheet of the present invention example was excellent in hydrophilicity after the initial and dry / wet cycles and excellent in antibacterial and antifungal properties after the initial and long-term progress.

  On the other hand, since the coating-coated aluminum plate of Comparative Example 1 did not have an antibacterial / antifungal agent in the resin coating solution, it was inferior in antibacterial and antifungal properties. In Comparative Example 2, since the epoxy resin was used as the organic resin of the resin coating solution, the coating film was inferior in hydrophilicity. In Comparative Example 3, since silver-based fine particles, which are inorganic, were used as the antibacterial / antifungal agent, the antibacterial / antifungal property of the coated aluminum sheet was inferior. In Comparative Example 4, since the baking temperature was lower than the melting point or decomposition temperature T (° C.) of the antibacterial / antifungal agent, the antibacterial / antifungal agent was not uniformly dispersed in the hydrophilic film, It was inferior in antibacterial and antifungal properties. In Comparative Example 5, since the baking temperature exceeded T + 100 (° C.), the resin paint deteriorated and the hydrophilicity and the coating film adhesion were inferior.

Claims (4)

An organic antibacterial material consisting of an organic resin made of at least one of polyvinyl alcohol resin, acrylic resin or cellulose resin and zinc bis [1,2-dihydro-2-thioxopyridine-1-olate] on an aluminum plate Applying a resin coating solution containing an antifungal agent;
When the melting point or decomposition temperature of the antibacterial / antifungal agent is T (° C.) on the aluminum plate coated with the resin coating solution, the plate surface temperature is 30 seconds or less at a temperature in the range of T to T + 100 (° C.). So that the baking process is performed,
A process for producing a coated aluminum sheet comprising a coating film. 2. The coating film-coated aluminum plate according to claim 1, wherein a blending ratio (weight) of the organic resin and the organic antibacterial / antifungal agent in the resin coating solution is 100: 1 to 100: 400. Method. The method for producing a coated aluminum sheet according to claim 1 or 2, wherein the solvent in the resin coating solution is water. The total amount of the organic resin and the organic antibacterial / antifungal agent is 100 parts by weight, and the solvent in the resin coating solution is 250 to 2000 parts by weight. A method for producing a coated aluminum sheet.