JP2006078134A - Aluminum fin material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum fin material excellent in fungus and mildew resistance and also excellent in sustainability. <P>SOLUTION: As at least one finished layer, a hydrophilic coating 103 having fungus and mildew resistance made of, as raw material, a fungus and mildew resistant agent having a solubility to 20&deg;C water of 10 mg/100 ml or less and a mixed material of organic-inorganic composite compound having hydrophily or hydrophilic resin. The condensate produced on the fin surface is made to flow down or discharged speedily by hydrophily, and the fungus and mildew resistant agent is gradually eluted from the hydrophily coating to the condensate. Thus, the excellent fungus and mildew resistant action can be exhibited for a long time. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a fin material for a heat exchanger such as an air conditioner made of aluminum (including an aluminum alloy in the present specification) having a coating film formed on the surface thereof, and has excellent corrosion resistance and hydrophilicity. , Aluminum fins with excellent productivity when processed into fins, excellent hydrophilic sustainability and antibacterial and antifungal properties even when contaminants adhere to the surface when used in air conditioners, etc. Is.

  Aluminum is usually used for heat exchanger fins such as air conditioners because of its excellent thermal conductivity and workability.

  Conventionally, an anticorrosion film has been formed on the surface of this type of heat exchanger fin material as a base treatment layer for the purpose of suppressing the occurrence of corrosion. And as the surface treatment layer above, condensed water generated on the surface of the fins of the indoor heat exchanger during cooling operation or the outdoor heat exchanger during heating operation in which the heat exchanger of the air conditioner is used as an evaporator A hydrophilic film is formed for the purpose of smoothly dropping and discharging. In recent years, this hydrophilic film has been developed and used for the purpose of maintaining its excellent hydrophilicity even if the fin surface is contaminated (for example, Patent Document 1, Patent Document 2 and Non-patent document 1). Further, as a surface treatment layer thereon, a water-soluble resin film may be formed for the purpose of improving lubricity when a fin is pressed (see, for example, Patent Document 2).

For example, the aluminum fin material of Patent Document 1 has a polymer compound having a solubility parameter of 7 to 9 [cal / cm ³ ] ^0.5 on aluminum and an aluminum alloy, and a solubility parameter of 12 to 16 [cal / cm]. ^3] contains as an essential component a high molecular compound is ^0.5, and the surface form is a resin-based aluminum fin material having excellent hydrophilicity characterized by having a resin film is finely roughened. In addition, the aluminum fin material of Patent Document 2 forms a corrosion-resistant film 17 made of any one of an inorganic oxide or an organic-inorganic composite compound as a first layer, and further has a polylayer as a second layer. A hydrophilic film having a thickness of 0.1 to 10 μm having any one of acrylic acid or polyacrylate and a water-soluble resin having a hydroxyl group in the molecule is formed. As three layers, a water-soluble resin film 19 having a hydroxyl group in the molecule and having a thickness of 0.1 to 10 μm is formed. In Non-Patent Document 1, the relationship between the film properties, hydrophilicity, and contamination properties of the hydrophilizing agent is studied. As the properties of the treatment agent composition, the solubility parameter is greatly different from that of the contaminant, and the water absorption rate is high. In addition, it has become clear that a small amount of elution into water is required.
Japanese Patent No. 2967855 Japanese Patent No. 3383914 Research on paints by Masahiro Murata et al. 138 July 2002, p. 60-65

  However, in the conventional configuration, as in the case of an aluminum fin material without surface treatment, when used in a dusty or dusty environment in a high temperature and high humidity atmosphere, the dust or dust adhering to the fin surface is used as a nutrient source. There was a problem that mold and bacteria propagated and an unpleasant odor was generated.

The present invention solves the above-mentioned conventional problems, and provides an aluminum fin material having excellent hydrophilicity and durability, and having antibacterial and antifungal properties that suppress the growth of mold and bacteria on the surface of the fin. The purpose is to provide.

  In order to solve the above-mentioned conventional problems, the aluminum fin material of the present invention comprises, as at least one surface treatment layer, an antibacterial / antifungal agent having a solubility in water at 20 ° C. of 10 mg / 100 ml or less, and an organic polymer substance, A hydrophilic film having antibacterial and antifungal properties is formed by using a mixed compound of a hydrophilic compound or a hydrophilic resin of an inorganic compound as a raw material.

  As a result, when the heat exchanger is used as an evaporator, the antibacterial / antifungal agent is gradually eluted from the hydrophilic film into the condensed water generated on the fin surface, thereby providing excellent antibacterial / antifungal action for a long period of time. Can be exerted over.

  Moreover, the aluminum fin material of the present invention forms a hydrophilic film having antibacterial and antifungal properties with a thickness of 0.1 to 10 μm, and the particle diameter of the antifungal and antifungal agent is smaller than the thickness of the hydrophilic film, And it shall be 1 micrometer or less.

  As a result, the antibacterial / antifungal agent is almost buried in the hydrophilic film, so that the hydrophilicity of the hydrophilic film is not significantly impaired, and the particle diameter of the antibacterial / antifungal agent is as small as 1 μm or less. Therefore, the same elution rate can be obtained with a smaller amount of the antifungal / antifungal agent than the antifungal / antifungal agent having a very large surface area per unit weight and a large particle size, which is economical.

  When the heat exchanger is used as an evaporator, the aluminum fin material of the present invention has excellent antibacterial and antifungal properties by gradually eluting the antibacterial and antifungal agent from the hydrophilic film into the condensed water generated on the fin surface. It is possible to exert a wrinkling effect over a long period.

  The aluminum fin material of the first invention is an antibacterial / antifungal agent having a solubility in water at 20 ° C. of 10 mg / 100 ml or less and an organic polymer as at least one surface treatment layer on a substrate made of aluminum or an aluminum alloy. When a heat exchanger is used as an evaporator by forming a hydrophilic film with antibacterial and antifungal properties using a mixed material of a hydrophilic compound of a substance and an inorganic compound or a hydrophilic resin as a raw material The condensed water generated on the fin surface flows down and drains quickly due to hydrophilicity, and the antibacterial and antifungal agent gradually elutes from the hydrophilic film into the condensed water, thereby providing excellent antibacterial and antifungal action over a long period of time. It can be demonstrated.

  The second invention is an inorganic oxide, an organic-inorganic composite compound, or an organic polymer compound as a base surface treatment layer of the hydrophilic film having antibacterial and antifungal properties, particularly in the aluminum fin material of the first invention. The corrosion resistance of the fin material can be improved by forming a corrosion-resistant film made of any one of the above.

The third invention is a water-soluble material having a thickness of 0.1 to 10 μm as the surface treatment layer of the hydrophilic film having antibacterial and antifungal properties, particularly in the aluminum fin material of the first or second invention. By forming the resin film, the aluminum fin material coated with the water-soluble resin film prevents the problems that the plates adhere to each other when coiled, and also the problem of adhesion to the mold when processed into fins. Can do. In addition, since the water-soluble resin film reacts with the underlying hydrophilic film, it remains slightly out of the condensate generated during cooling operation, but remains slightly. is there. The water-soluble resin film does not have the above-described effects unless the thickness is 0.1 μm or more, and is desirably 10 μm or less from the viewpoint of workability and economical efficiency during coating.

  According to a fourth invention, in particular, in the aluminum fin material of any one of the first to third inventions, the hydrophilic film having antibacterial and antifungal properties is formed with a thickness of 0.1 to 10 μm. Thus, excellent hydrophilicity and antibacterial and antifungal properties can be obtained economically. The upper limit of the film thickness is not particularly limited from the viewpoint of its function, but is preferably 10 μm or less in view of workability during coating.

  In the fifth aspect of the invention, in particular, in the aluminum fin material according to any one of the first to fourth aspects, the hydrophilic film having antibacterial and antifungal properties has a hygroscopic property. Even when not in use, it absorbs moisture in the air to form a thin water film, and this water film makes it difficult for contaminants to adhere, so it has the effect of maintaining excellent hydrophilicity, Since the agent gradually elutes into the water film, the antibacterial and antifungal properties can be exhibited even when not used as an evaporator.

In the sixth invention, in particular, in the aluminum fin material according to any one of the first to fifth inventions, the hydrophilic film having antibacterial and antifungal properties has a solubility parameter of 7 to 9 [cal / cm ³ ]. ^{By including} a high molecular compound having a molecular weight of ^0.5 and a high molecular compound having a solubility parameter of 12 to 16 [cal / cm ³ ] ^0.5 as essential components, the solubility parameter in the film is greatly increased in the baking process during film formation. Since two or more different components cause a layer separation phenomenon, the surface form after baking and drying can be finely roughened, and the hydrophilicity is further improved by the form effect. Further, by selecting a material having a solubility parameter greatly different from that of the contaminant attached to the fin surface of the heat exchanger, it is possible to prevent the attachment of the contaminant and maintain excellent hydrophilicity.

  In a seventh aspect of the invention, in particular, in the aluminum fin material of any one of the first to sixth aspects, the antibacterial and antifungal hydrophilic film comprises at least one of polyvinyl alcohol, nylon, and acrylic resin. By containing it, the substance which mixed easily the resin excellent in hydrophilicity and antibacterial / antifungal agent can be used as a raw material, and it can have the outstanding hydrophilicity and antifungal / antifungal property.

  In an eighth aspect of the present invention, in particular, in the aluminum fin material according to any one of the first to seventh aspects, the hydrophilic film having antibacterial and antifungal properties contains a water-soluble resin having a hydroxyl group in the molecule. As a result, a strong adhesion hydrophilic film layer is formed and the hydrophilic film has high adhesion, so that the outflow of the water-soluble resin containing a hydroxyl group can be suppressed and hydrophilic sustainability can be imparted. Thus, contaminants are difficult to adhere and the hydrophilic sustainability is unlikely to deteriorate.

  According to a ninth invention, in particular, in the aluminum fin material of any one of the third to eighth inventions, the water-soluble resin film formed on the upper layer of the hydrophilic film having antibacterial and antifungal properties is in the molecule. By having a hydroxyl group, the hydroxyl group of this water-soluble resin film reacts with the polymer resin of the hydrophilic film, which is the lower layer film, so that it remains slightly out of the condensate generated during cooling operation. There exists an effect | action which raises the effect which improves the hydrophilic persistence at the time of contaminant adhesion.

According to a tenth aspect of the invention, in particular, in the aluminum fin material according to any one of the first to ninth aspects, the particle size of the antibacterial / antifungal agent is determined from the thickness of the hydrophilic film having the antibacterial / antifungal property. By making it small and 1 μm or less, the antibacterial / antifungal agent is almost buried in the hydrophilic film, so that the hydrophilicity of the hydrophilic film is not significantly impaired. Since the surface area per unit weight is very large, the same elution rate can be obtained with a smaller amount of antibacterial / antifungal agent compared to a large particle size antibacterial / antifungal agent, Economical.

  In the eleventh invention, in particular, in the aluminum fin material of any one of the first to tenth inventions, the mixing ratio of the antibacterial / antifungal agent, the organic polymer substance and the composite material of the inorganic compound or the hydrophilic resin is 1 : By using the mixture which is 9-5: 5 as a raw material, it is possible to secure the weight of the antibacterial / antifungal agent necessary for exhibiting the antibacterial / antifungal effect over a long period of time.

  In the twelfth aspect of the invention, in particular, in the aluminum fin material of any one of the first to eleventh aspects of the invention, the antibacterial and antifungal agent is zinc pyrithione, thereby providing excellent antibacterial and antifungal properties over a long period of time. It can be demonstrated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a sectional view of an aluminum fin material according to the first embodiment of the present invention.

  The configuration of the aluminum fin material 100 will be described below with reference to FIG.

  On the substrate 101 made of aluminum or an aluminum alloy, a corrosion-resistant film 102 made of any one of an inorganic oxide, an organic-inorganic composite compound, or an organic polymer compound is formed as a base surface treatment layer.

  Next, as an upper surface treatment layer of the corrosion-resistant film 102, an antifungal agent having a solubility in water at 20 ° C. of 10 mg / 100 ml or less, and a composite compound or hydrophilic resin having hydrophilicity between an organic polymer substance and an inorganic compound The hydrophilic film 103 having antibacterial and antifungal properties is formed using the above mixed material as a raw material.

  Further, a water-soluble resin film 104 having a thickness of 0.1 to 10 μm is formed as an upper surface treatment layer of the hydrophilic film 103 having antibacterial and antifungal properties.

  The hydrophilic film 103 having antibacterial and antifungal properties is formed with a thickness of 0.1 to 10 μm.

  The hydrophilic film 103 having antibacterial and antifungal properties is hygroscopic.

The hydrophilic film 103 having antibacterial and antifungal properties is a polymer compound having a solubility parameter of 7 to 9 [cal / cm ³ ] ^0.5 and a high solubility parameter of 12 to 16 [cal / cm ³ ] ^0.5 A molecular compound is included as an essential component.

  The hydrophilic film 103 having antibacterial and antifungal properties contains at least one of polyvinyl alcohol, nylon, and acrylic resin.

  The hydrophilic film 103 having antibacterial and antifungal properties contains a water-soluble resin having a hydroxyl group in the molecule.

  The water-soluble resin film 104 formed on the hydrophilic film 103 having antibacterial and antifungal properties has a hydroxyl group in the molecule.

The particle diameter of the antibacterial / antifungal agent is set to be smaller than the film thickness of the hydrophilic film 103 having antibacterial / antifungal properties and 1 μm or less.

  The hydrophilic film 103 having antibacterial and antifungal properties is made from a mixture in which the mixing ratio of the antibacterial and antifungal agent, the organic polymer substance and the inorganic compound or the hydrophilic resin is 1: 9 to 5: 5. Used as

  Various commercially available antibacterial / antifungal agents to be mixed with the hydrophilic film 103 having antibacterial / antifungal properties can be used, but zinc pyrithione is preferable.

  About the aluminum fin material 100 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  Corrosion resistance of the fin material is formed by forming a corrosion-resistant film made of any one of an inorganic oxide, an organic-inorganic composite compound, and an organic polymer compound as a base surface treatment layer on a substrate 101 made of aluminum or an aluminum alloy. Can be improved.

  Mixing of antibacterial and antifungal agent having a solubility in water at 20 ° C. of 10 mg / 100 ml or less and a composite compound or hydrophilic resin having hydrophilicity between an organic polymer substance and an inorganic compound as the upper surface treatment layer of the corrosion-resistant film 102 By forming a hydrophilic film 103 having antibacterial and antifungal properties using a substance as a raw material, when the heat exchanger is used as an evaporator, the condensed water generated on the fin surface flows down quickly due to the hydrophilicity. In addition, the antibacterial / antifungal agent is gradually eluted from the hydrophilic film 103 into the condensed water, whereby an excellent antibacterial / antifungal effect can be exhibited over a long period of time.

  Further, aluminum coated with the water-soluble resin film 104 by forming a water-soluble resin film 104 having a thickness of 0.1 to 10 μm as the upper surface treatment layer of the hydrophilic film 103 having antibacterial and antifungal properties. The fin material can prevent the problem that the plates adhere to each other when coiled, and the problem that the fin material adheres to the mold when processed into a fin. In addition, since the water-soluble resin film 104 reacts with the underlying hydrophilic film 103, since it remains slightly out of the condensed water generated during cooling operation, the effect of improving the hydrophilic sustainability when adhering contaminants, There is an effect. The water-soluble resin film 104 does not have the above-described effect unless the thickness is 0.1 μm or more, and is desirably 10 μm or less from the viewpoint of workability and economical efficiency during coating.

  By forming the hydrophilic film 103 having antibacterial and antifungal properties with a thickness of 0.1 to 10 μm, excellent hydrophilicity and antibacterial and antifungal properties can be obtained economically. The upper limit of the film thickness is not particularly limited from the viewpoint of its function, but is preferably 10 μm or less in view of workability during coating.

  Since the hydrophilic film 103 having antibacterial and antifungal properties has hygroscopicity, a thin water film is formed on the fin surface by adsorbing moisture in the air even when not used as an evaporator. Since the membrane makes it difficult for contaminants to adhere, it has the effect of maintaining excellent hydrophilicity, and the antibacterial and antifungal agent gradually elutes into this water film, preventing it even when not used as an evaporator. It can exhibit fungicidal properties.

The hydrophilic film 103 having antibacterial and antifungal properties is a polymer compound having a solubility parameter of 7 to 9 [cal / cm ³ ] ^0.5 and a high solubility parameter of 12 to 16 [cal / cm ³ ] ^0.5 By including a molecular compound as an essential component, two or more components with greatly different solubility parameters in the film cause a layer separation phenomenon in the baking process during film formation, so that the surface morphology after baking and drying is finely roughened. The hydrophilicity is further improved by the morphological effect. Further, by selecting a material having a solubility parameter greatly different from that of the contaminant attached to the fin surface of the heat exchanger, it is possible to prevent the attachment of the contaminant and maintain excellent hydrophilicity.

  Substance in which the hydrophilic film 103 having antibacterial and fungicidal properties contains any one or more of polyvinyl alcohol, nylon, and acrylic resin, so that a resin excellent in hydrophilicity and an antibacterial and antifungal agent are easily mixed Can be used as a raw material, and can have excellent hydrophilicity and antibacterial and antifungal properties.

  When the hydrophilic film 103 having antibacterial and antifungal properties contains a water-soluble resin having a hydroxyl group in the molecule, a hydrophilic film layer having strong adhesion is formed, and the hydrophilic film has high adhesion. Therefore, the outflow of the water-soluble resin containing a hydroxyl group can be suppressed and hydrophilic sustainability can be imparted, and in addition, contaminants are difficult to adhere and the hydrophilic sustainability is unlikely to deteriorate.

  Since the water-soluble resin film 104 formed on the upper layer of the hydrophilic film 103 having antibacterial and antifungal properties has a hydroxyl group in the molecule, the hydroxyl group of the water-soluble resin film 104 is a hydrophilic film that is a lower layer film. Since it reacts with the polymer resin No. 103 and is almost discharged by the condensed water generated during the cooling operation, it remains slightly, so that it has the effect of further enhancing the effect of improving the hydrophilicity at the time of adhering contaminants.

  By making the particle diameter of the antibacterial and antifungal agent of the hydrophilic film 103 having antibacterial and antifungal properties smaller than the film thickness of the hydrophilic film 103 having antibacterial and antifungal properties and not more than 1 μm, Since the glaze is almost buried in the hydrophilic film, the hydrophilicity of the hydrophilic film 103 is not impaired so much, and the particle size of the antibacterial / antifungal agent is as small as 1 μm or less. Since the same elution rate can be obtained with a smaller amount of the antibacterial / antifungal agent than the antibacterial / antifungal agent having a very large surface area and a large particle size, it is economical.

  The hydrophilic film 103 having antibacterial and antifungal properties is made from a mixture in which the mixing ratio of the antibacterial and antifungal agent, the organic polymer substance and the inorganic compound or the hydrophilic resin is 1: 9 to 5: 5. By using as, it is possible to secure the weight of the antibacterial / antifungal agent necessary for exhibiting the antibacterial / antifungal effect over a long period.

  The antibacterial and antifungal agent of the hydrophilic film 103 having antibacterial and antifungal properties is not limited as long as it has either one or both of antibacterial and / or antifungal properties, and among these, sustainability is maintained. Therefore, since the solubility in water at 20 ° C. is 10 mg / 100 ml or less, and there is a baking and drying step and a press molding step of the fin material at the time of forming the surface treatment film, heat-resistant and workable organic and inorganic systems Are preferred. These antibacterial and antifungal agents are added alone or in combination. Specifically, in organic antibacterial and antifungal agents, as main components, isothiazoline, aldehyde, benzimidazole, fatty acid glycerin ester, halogen, carboxylic acid, quinoline, sulfide, sulfamide, Examples include antibacterial and antifungal agents containing thiazole, triazole, hinokitiol, hydantoin, pyridine, phenol, phthalimide, naphthenic acid, glutamic acid, quaternary ammonium salt, and natural products. On the other hand, examples of the inorganic antibacterial / antifungal agent include those containing an inorganic carrier carrying an antibacterial metal such as Ag, Cu, Zn or the like as a main component. Examples of the carrier include zeolite, silica gel, glass, calcium phosphate, zirconium phosphate, silicate, titanium oxide, whisker, clay mineral, etc. Pyridine zinc pyrithione, which is an antifungal material, has excellent heat resistance and processability, low solubility in water, and can exhibit excellent antifungal and antifungal properties safely over a long period of time.

  As described above, since the aluminum fin material according to the present invention can suppress the growth of bacteria and mold on the surface of the fin material, not only the heat exchanger of the air conditioner but also the aluminum material for building aluminum. In addition, the substrate can be applied to the surface treatment of other metals and plastics instead of aluminum.

Sectional drawing of the aluminum fin material in Embodiment 1 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Aluminum fin material 101 Aluminum board | substrate 102 Corrosion-resistant film 103 Hydrophilic film | membrane which has antibacterial and antifungal property 104 Water-soluble resin film

Claims (12)

Antibacterial / antifungal agent having a solubility in water at 20 ° C. of 10 mg / 100 ml or less as at least one surface treatment layer on a substrate made of aluminum or an aluminum alloy used as a fin material of a heat exchanger used in an air conditioner An aluminum fin material characterized by forming a hydrophilic film having antibacterial and antifungal properties using a mixed material of a hydrophilic composite compound of an organic polymer substance and an inorganic compound or a hydrophilic resin as a raw material. An anticorrosion film made of any one of an inorganic oxide, an organic-inorganic composite compound, or an organic polymer compound is formed as a base surface treatment layer of the hydrophilic film having antibacterial and antifungal properties. Item 2. The aluminum fin material according to Item 1. 3. The aluminum fin material according to claim 1, wherein a water-soluble resin film having a thickness of 0.1 to 10 μm is formed as the upper surface treatment layer of the hydrophilic film having antibacterial and antifungal properties. . The aluminum fin material according to any one of claims 1 to 3, wherein the hydrophilic film having antibacterial and antifungal properties is formed with a thickness of 0.1 to 10 µm. The aluminum fin material according to any one of claims 1 to 4, wherein the hydrophilic film having antibacterial and antifungal properties has a hygroscopic property. The hydrophilic film having antibacterial and antifungal properties is a polymer compound having a solubility parameter of 7-9 [cal / cm ³ ] ^0.5 and a high solubility parameter of 12-16 [cal / cm ³ ] ^0.5 A molecular compound is contained as an essential component, The aluminum fin material of any one of Claims 1-5 characterized by the above-mentioned. The aluminum fin material according to any one of claims 1 to 6, wherein the hydrophilic film having antibacterial and antifungal properties contains at least one of polyvinyl alcohol, nylon, and acrylic resin. The aluminum fin material according to any one of claims 1 to 7, wherein the hydrophilic film having antibacterial and antifungal properties contains a water-soluble resin having a hydroxyl group in the molecule. The aluminum fin material according to any one of claims 3 to 8, wherein the water-soluble resin film formed on the hydrophilic film having antibacterial and antifungal properties has a hydroxyl group in a molecule. . The particle diameter of the antibacterial / antifungal agent is smaller than the film thickness of the hydrophilic film having the antibacterial / antifungal property and is 1 μm or less, according to claim 1. Aluminum fin material. A mixture in which the mixing ratio of the antibacterial / antifungal agent, the organic polymer substance / inorganic compound composite material or the hydrophilic resin is 1: 9 to 5: 5 is used as a raw material. The aluminum fin material according to any one of the above. The aluminum fin material according to any one of claims 1 to 11, wherein the antibacterial and antifungal agent is zinc pyrithione.

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