CN115315609A - Aluminum fin material - Google Patents

Aluminum fin material Download PDF

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Publication number
CN115315609A
CN115315609A CN202180024118.6A CN202180024118A CN115315609A CN 115315609 A CN115315609 A CN 115315609A CN 202180024118 A CN202180024118 A CN 202180024118A CN 115315609 A CN115315609 A CN 115315609A
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Prior art keywords
hydrophilic
fin material
coating film
aluminum
surfactant
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CN202180024118.6A
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Chinese (zh)
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馆山庆太
角田亮介
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Kobe Steel Ltd
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Kobe Steel Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D201/00—Coating compositions based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/63—Additives non-macromolecular organic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
    • F28F19/04—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of rubber; of plastics material; of varnish

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geometry (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)

Abstract

Provided is an aluminum fin material which has both oil repellency for appropriately suppressing the adhesion of contaminants and excellent hydrophilicity. An aluminum fin material (10) is provided with an aluminum sheet (1), a hydrophilic coating film (2), and a functional coating film (3) in this order, wherein the hydrophilic coating film (2) contains a surfactant and a hydrophilic resin, the functional coating film (3) contains a silicone component, the surfactant has an alkyl chain as a lipophilic group, and the number of carbons in the alkyl chain is 16 or less.

Description

Aluminum fin material
Technical Field
The present invention relates to an aluminum fin material, and more particularly to an aluminum fin material suitable for use in a heat exchanger of an air conditioner or the like.
Background
Heat exchangers are used in products in various fields such as room air conditioners, combination air conditioners, refrigerated showcases, refrigerators, oil coolers, radiators and the like. The fin of the heat exchanger is generally made of aluminum or an aluminum alloy having excellent thermal conductivity, workability, corrosion resistance, and the like. Plate-fin and plate-tube heat exchangers have a structure in which fin members are arranged in parallel at narrow intervals.
When the surface temperature of the fins of the heat exchanger becomes lower than the dew point, dew condensation water adheres to the fins. When the hydrophilicity of the surface of the fin is low, the contact angle of the adhering dew condensation water becomes large, and therefore water scattering called water splash occurs to the living environment. When the amount of such condensed water is increased, bridges are formed between adjacent fins, and the ventilation path between the fins is blocked, thereby increasing the ventilation resistance.
For the purpose of preventing such water splash and reducing ventilation resistance, for example, patent document 1 proposes a technique of forming a hydrophilic coating film on the surface of a fin by coating.
On the other hand, the fins may have contaminants attached to their surfaces, which are derived from floating materials that volatilize and scatter from building materials, foods, living goods, and the like, and which contain an oily component as a main component. Since such contaminants are water repellent substances, hydrophilicity deteriorates when they adhere to the surface of the fin.
In order to make such a water-repellent substance less likely to adhere to the surface of the fin, it is effective to impart hydrophilicity and oil repellency to the fin sheet. For example, patent document 2 discloses an aluminum fin sheet having a coating film having both hydrophilicity and oil repellency by containing a predetermined amount of a polyvinyl alcohol resin having a saponification degree of 90% or more.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 2520308
Patent document 2: japanese patent laid-open publication No. 2011-94873
Disclosure of Invention
Problems to be solved by the invention
However, according to the technique of patent document 2, if the content of the polyvinyl alcohol resin having a saponification degree of 90% or more is increased in order to improve oil repellency, hydrophilicity is reduced. Thus, there is a limit to obtaining the desired high efficacy in both oil repellency and hydrophilicity.
Therefore, an object of the present invention is to provide an aluminum fin material that has both oil repellency that can appropriately suppress the adhesion of contaminants and very good hydrophilicity.
Means for solving the problems
The present invention relates to the following [1] to [8].
[1] An aluminum fin material comprising, in order, an aluminum sheet, a hydrophilic coating film containing a surfactant and a hydrophilic resin, and a functional coating film containing a silicone component, wherein the surfactant has an alkyl chain as a lipophilic group, and the number of carbon atoms in the alkyl chain is 16 or less.
[2] The aluminum fin material according to the above [1], wherein the surfactant is an anionic surfactant.
[3] The aluminum fin material according to the above [2], wherein the anionic surfactant contains at least one compound selected from the group consisting of polyoxyethylene alkyl ether phosphate, polyoxyethylene alkyl ether sulfate, and polyoxyethylene alkyl sulfosuccinate.
[4]According to [1] above]～[3]The aluminum fin material of any one of the above claims, wherein an amount of the surfactant adhered to the hydrophilic coating film is 0.0003 to 0.7g/m 2 。
[5]According to [1] above]～[4]The aluminum fin material according to any one of the above aspects, wherein an amount of the silicone component adhering to the functional coating film is 0.0010 to 1.0g/m 2 。
[6]According to [1] above]～[5]The aluminum fin material of any one of the above claims, wherein an adhesion amount of the hydrophilic resin in the hydrophilic coating film is 0.05 to 5g/m 2 。
[7]According to said [1]～[6]The aluminum fin material according to any one of the above aspects, wherein the functional coating is a lubricating coating containing a lubricating component, and an amount of the lubricating component adhering to the lubricating coating is 0.05 to 5g/m 2 。
[8] The aluminum fin material according to any one of the above [1] to [7], further comprising a corrosion-resistant coating film between the aluminum plate and the hydrophilic coating film, the corrosion-resistant coating film containing a hydrophobic resin.
Effects of the invention
According to the present invention, an aluminum fin material having excellent oil repellency and hydrophilicity can be provided. As a result, the aluminum fin material can be obtained which can appropriately suppress the adhesion of contaminants and can prevent water splash and reduce air flow resistance.
Drawings
Fig. 1 is a schematic cross-sectional view showing one embodiment of the structure of an aluminum fin material.
Detailed Description
Hereinafter, a mode of an aluminum fin material for carrying out the present invention will be described in detail. The term "to" indicating a numerical range is used to include numerical values described before and after the term as a lower limit and an upper limit.
< aluminum Fin sheet >
An aluminum fin material 10 (hereinafter simply referred to as fin material) according to the present embodiment includes, as shown in fig. 1, an aluminum plate 1, a hydrophilic coating film 2, and a functional coating film 3 in this order. The corrosion-resistant coating may be provided between the aluminum plate 1 and the hydrophilic coating 2, and the primer treatment layer may be further provided between the aluminum plate 1 and the corrosion-resistant coating. Preferably, functional film 3 is formed on hydrophilic film 2.
At least one surface of aluminum plate 1 may have the above-described configuration, and both surfaces of aluminum plate 1 may have the above-described configuration. In addition, when both surfaces of the aluminum plate 1 are configured as described above, it is not necessary that both surfaces have the same shape.
The hydrophilic film 2 contains a surfactant having an alkyl chain as a lipophilic group and a hydrophilic resin. The number of carbons in such an alkyl chain is 16 or less. The functional film 3 contains a silicone component.
By providing the hydrophilic film 2 and the functional film 3, the properties of oil repellency that can appropriately suppress the adhesion of contaminants to the fin material and hydrophilicity that can prevent water splash and reduce air flow resistance can be improved while achieving both of them without interfering with each other.
The oil-repellent effect of the functional coating film is maintained even in a state where no dew condensation water is generated. Therefore, the fin material can suppress deterioration of hydrophilicity by suppressing adhesion of contaminants mainly composed of an oil component, regardless of whether or not the fin material is in cooling operation.
(aluminium plate)
The aluminum plate is a concept including a plate made of aluminum and a plate made of an aluminum alloy, and conventionally used aluminum plates for aluminum fin materials can be used.
As the aluminum plate, from the viewpoint of excellent thermal conductivity and workability, JIS H4000: 2014 to 1000 series aluminum. More specifically, as the aluminum plate, aluminum alloy nos. 1050, 1070, and 1200 is more preferable. However, in the above description, the use of 2000 series to 9000 series aluminum alloys and other aluminum plates is not excluded.
The aluminum plate is appropriately formed to a desired thickness according to the use, specification, and the like of the fin material. The thickness of the fin material for a heat exchanger is preferably 0.08mm or more, more preferably 0.1mm or more, from the viewpoint of strength of the fin and the like. On the other hand, the thickness is preferably 0.3mm or less, more preferably 0.2mm or less, from the viewpoint of workability of the fin to be processed, heat exchange efficiency, and the like.
(hydrophilic coating)
The hydrophilic coating is a coating for imparting hydrophilicity to the surface of the fin material, and contains a hydrophilic resin and a surfactant. Thus, even when a functional coating is provided on the hydrophilic coating, oil repellency by the functional coating can be combined with good hydrophilicity. This is considered to be the effect exhibited by the surfactant.
The hydrophilic coating film can be formed by applying a resin coating material containing a hydrophilic resin and a surfactant to an aluminum plate, or by applying a primer layer and a corrosion-resistant coating film to an aluminum plate, followed by curing by drying or the like.
The surfactant has a hydrophilic group and a lipophilic group, and has an alkyl chain having 6 to 16 carbon atoms as the lipophilic group. This is expected to improve the fluidity of the hydrophilic component in the hydrophilic film, and as a result, the hydrophilic component can be distributed to the entire hydrophilic film. That is, the effect of improving hydrophilicity by the hydrophilic coating can be ensured.
The number of carbon atoms in the alkyl chain may be 16 or less, but is preferably 14 or less, and more preferably 10 or less, from the viewpoint that the surfactant is more appropriately dispersed in the hydrophilic coating film and the effect of improving hydrophilicity by the surfactant can be more appropriately exerted. The number of carbons in the alkyl chain is preferably 6 or more, and more preferably 8 or more, from the viewpoint of being able to properly function as a hydrophobic group of the surfactant.
The alkyl chain may be linear or branched.
The surfactant may be any of anionic, cationic and nonionic surfactants, but from the viewpoint of maintaining both hydrophilicity and oil repellency for a long period of time, an anionic or cationic surfactant is preferred, and an anionic surfactant is more preferred.
The anionic surfactant preferably contains at least one compound selected from the group consisting of polyoxyethylene alkyl ether phosphate, polyoxyethylene alkyl ether sulfate, and polyoxyethylene alkyl sulfosuccinate, from the viewpoint of improving hydrophilicity.
The amount of the surfactant deposited on the hydrophilic coating film is preferably 0.0003g/m from the viewpoint of obtaining sufficient hydrophilicity 2 Above, more preferably 0.0005g/m 2 The content of the above is more preferably 0.001g/m 2 Above, it is more preferably 0.005g/m 2 As described above. In addition, the amount of the surfactant to be attached is preferably 0.7g/m from the viewpoint of preventing the oil repellency by the functional coating film from being inhibited due to too strong hydrophilicity 2 Hereinafter, more preferably 0.5g/m 2 It is more preferably 0.05g/m or less 2 The following.
The hydrophilic resin may have a hydrophilic group, and may contain one kind of resin or two or more kinds of resins. Examples of the hydrophilic group include a hydroxyl group (hydroxyl group), a carboxyl group, a sulfonic acid group, and a polyether group.
Examples of the hydrophilic resin having a hydroxyl group include polyethylene glycol (PEG, PEO), polyvinyl alcohol (PVA), and the like. Examples of the hydrophilic resin having a carboxyl group include polyacrylic acid (PAA). As the hydrophilic resin having a hydroxyl group and a carboxyl group, carboxymethyl cellulose (CMC) and the like can be cited. Examples of the hydrophilic resin having a sulfonic acid group include sulfoethyl acrylate. Examples of the hydrophilic resin having a polyether group include polyethylene glycol (PEG, PEO) and modified compounds thereof.
In addition to these, a copolymer in which two or more kinds of monomers having a hydrophilic group are used can also be used, and for example, a copolymer of acrylic acid and sulfoethyl acrylate is preferable.
In the case of the copolymer, the arrangement of the monomers is not particularly limited, and may be an alternating copolymer, a block copolymer, a graft copolymer, a random copolymer, or the like.
The amount of the hydrophilic resin deposited on the hydrophilic coating is preferably 0.05g/m from the viewpoint of obtaining sufficient hydrophilicity 2 Above, more preferably 0.1g/m 2 Above, more preferably 0.3g/m 2 The above. When the surface of the fin material is wetted with water, the amount of hydrophilic resin deposited is preferably 5g/m from the viewpoint of preventing the hydrophilic resin from dissolving out and inhibiting the oil repellency by the functional coating film 2 Hereinafter, more preferably 1g/m 2 It is more preferably 0.8g/m or less 2 The following.
The hydrophilic coating may contain other optional components in addition to the hydrophilic resin and the surfactant within a range not impairing the effects of the present invention. Examples of the optional component include various aqueous solvents and paint additives for improving coatability, workability, and physical properties of the coating film.
Examples of the paint additive include a water-soluble organic solvent, a crosslinking agent, a surface modifier, a wetting dispersant, a precipitation inhibitor, an antioxidant, an antifoaming agent, a rust inhibitor, an antibacterial agent, and a fungicide. These coating additives may include one kind or two or more kinds.
The thickness of the hydrophilic coating is not particularly limited, but the density of the hydrophilic coating is assumed to be 1g/cm 3 From the viewpoint of obtaining good hydrophilicity, the thickness is preferably 0.01 μm or more, more preferably 0.1 μm or more, and still more preferably 0.3 μm or more. From the viewpoint of obtaining good coating workability in film formation, the thickness is preferably 5 μm or less, more preferably 1 μm or less, and still more preferably 0.8 μm or less.
The film thickness of the hydrophilic coating film can be adjusted by, for example, selecting the concentration of the coating composition used for forming the hydrophilic coating film and the bar coater type used for forming the film.
(functional coating film)
The functional coating film contains a silicone component.
By containing a silicone component, which is considered to have a small surface free energy and low adhesion of a substance, in the functional coating film formed on the outermost surface of the fin material while inhibiting adhesion of a contaminant, mainly an oily component, can be reduced.
When the functional film is a lubricating film for improving the lubricity of the surface of the fin material, it is preferable to further contain a resin for improving the lubricity (hereinafter referred to as a functional resin). If the lubricating coating film contains a functional resin, the friction coefficient of the surface of the fin material decreases, and the press formability and the like when the fin material is processed into a fin are improved.
The functional film can be formed by applying a coating material containing a silicone component and a functional resin as required on the hydrophilic film and curing the coating material by drying or the like.
The silicone component is a polymer of a silicon compound, and is a compound having a silicon-oxygen bond as a skeleton. Since the silicone component has high dispersibility in the paint and high fixability in the resin film, the silicone component preferably contains a modified polydimethylsiloxane derivative having one or more functional groups selected from a polyether group, an epoxy group, a methacryl group, an amino group, a phenyl group, a hydrogen group, and a hydroxyl group in the structure, and more preferably contains a modified polydimethylsiloxane derivative having one or more functional groups selected from a group consisting of an epoxy group, a methacryl group, a phenyl group, and a hydrogen group in the structure. Further, silicone containing a long chain alkyl group is also preferable.
The silicone containing the modified polydimethylsiloxane derivative and the long-chain alkyl group may be any of nonionic, anionic, and cationic silicones.
The amount of silicone component adhering to the functional coating film is preferably 0.0010g/m from the viewpoint of obtaining sufficient oil repellency and suppressing adhesion of oily components 2 More preferably 0.006g/m or more 2 Above, more preferably 0.01g/m 2 The above. On the other hand, since the silicone component exhibits water repellency as well as oil repellency, the amount of adhesion of the silicone component is preferably 1.0g/m from the viewpoint of preventing the hydrophilic function by the hydrophilic coating from being inhibited 2 Hereinafter, more preferably 0.3g/m 2 Hereinafter, more preferably 0.1g/m 2 The amount of the surfactant is more preferably 0.05g/m or less 2 The following.
When the functional film is a lubricating film, examples of the functional resin include a resin having a hydrophilic group. The resin may contain one kind or two or more kinds. Examples of the hydrophilic group include a hydroxyl group (hydroxyl group), a carboxyl group, a sulfonic acid group, and a polyether group.
Examples of the hydroxyl group-containing compound include polyethylene glycol (PEG, PEO) and polyvinyl alcohol (PVA). Examples of the carboxyl group-containing compound include polyacrylic acid (PAA). Examples of the hydroxyl group and the carboxyl group include carboxymethyl cellulose (CMC). Examples of the sulfonic acid group-containing compound include sulfoethyl acrylate. Examples of the polyether group-containing compound include polyethylene glycol (PEG, PEO) and modified compounds thereof.
In addition, two or more kinds of copolymers of monomers having a hydrophilic group can also be applied.
Among them, those having a hydroxyl group are preferable, and polyethylene glycol (PEG, PEO) is more preferable.
The functional coating may contain other optional components in addition to the above components within a range not impairing the effects of the present invention. Examples of the optional component include various aqueous solvents and paint additives for improving the coatability, workability, and physical properties of the coating film.
Examples of the paint additive include a water-soluble organic solvent, a crosslinking agent, a surfactant, a surface modifier, a wetting dispersant, an anti-settling agent, an antioxidant, an antifoaming agent, a rust preventive, an antibacterial agent, and a mildewproofing agent. These coating additives may include one kind or two or more kinds.
The amount of the functional resin deposited on the functional coating film is preferably 0.01g/m from the viewpoint of obtaining sufficient lubricity 2 Above, more preferably 0.03g/m 2 Above, more preferably 0.05g/m 2 The above. On the other hand, when the surface of the fin material is wetted with water, the amount of adhesion is preferably 5g/m from the viewpoint of inhibiting elution of the functional resin to inhibit oil repellency or reducing workability of coating the functional coating film 2 Hereinafter, more preferably 0.5g/m 2 Hereinafter, more preferably 0.3g/m 2 The amount of the surfactant is more preferably 0.1g/m or less 2 The following.
The thickness of the functional coating is not larger thanThe density of the functional coating is particularly limited, but is assumed to be 1g/cm 3 From the viewpoint of obtaining good oil repellency, it is preferably 0.001 μm or more, more preferably 0.01 μm or more, and still more preferably 0.03 μm or more. From the viewpoint of obtaining good coating workability in film formation, it is preferably 5 μm or less, more preferably 1 μm or less, and still more preferably 0.5 μm or less.
The film thickness of the functional coating film can be adjusted by, for example, selecting the concentration of the coating composition used for forming the functional coating film and the bar coater type used for forming the film.
The total film thickness of the hydrophilic film and the functional film is preferably 5 μm or less from the viewpoint of suppressing a decrease in heat exchange efficiency of the fin material.
(base treatment layer)
The base treatment layer may be positioned between the aluminum plate and the hydrophilic coating film as necessary. When the fin material further has a corrosion-resistant coating film, the undercoat treatment layer can be located between the aluminum sheet and the corrosion-resistant coating film.
By providing the undercoat layer, the corrosion resistance of the aluminum sheet can be improved, the adhesion between the aluminum sheet and the hydrophilic coating film can be improved, and when the undercoat layer is provided, the adhesion between the aluminum sheet and the corrosion-resistant coating film can be improved.
The base treatment layer may be any layer that imparts corrosion resistance to the aluminum sheet, and conventionally known layers can be used. For example, a layer composed of an inorganic oxide or an inorganic-organic composite compound can be used.
As the inorganic material constituting the inorganic oxide and the inorganic-organic composite compound, chromium (Cr), zirconium (Zr), or titanium (Ti) is preferable as a main component.
The layer formed of an inorganic oxide as the base treatment layer can be formed, for example, by subjecting an aluminum plate to a chromate treatment, a zirconium phosphate treatment, a zirconium oxide treatment, a chromate treatment, a zinc phosphate treatment, a titanyl phosphate treatment, or the like. However, the kind of the inorganic oxide is not limited to the one formed by these treatments.
The layer formed of an inorganic-organic composite compound as the base treatment layer can be formed, for example, by subjecting an aluminum plate to a coating-type chromate treatment, a coating-type zirconium treatment, or the like. Specific examples of such an inorganic-organic composite compound include, for example, an acrylic acid-zirconium composite.
The thickness of the primer layer is not particularly limited and may be suitably set, but the amount of deposit per unit area is preferably 1 to 100mg/m in terms of metal (Cr, zr, ti) 2 The film thickness is preferably 1 to 100nm.
The deposition amount and the film thickness of the base process layer can be adjusted by adjusting the concentration of the chemical conversion treatment liquid used for forming the base process layer and the film formation treatment time.
The surface of the aluminum plate may be pre-degreased with an alkaline degreasing solution before the formation of the foundation treatment layer, whereby the reactivity of the foundation treatment is improved and the adhesion of the formed foundation treatment layer is also improved.
(Corrosion-resistant coating film)
The corrosion-resistant coating is preferably a layer present between the aluminum plate and the hydrophilic coating, mainly for the purpose of improving the corrosion resistance of the aluminum plate, and contains a hydrophobic resin. When the base treatment layer is formed on the surface of the aluminum sheet, the corrosion-resistant coating film is present between the base treatment layer and the hydrophilic coating film.
The corrosion-resistant coating film can be formed by, for example, applying a resin coating material containing a hydrophobic resin on an aluminum plate or an undercoat layer, and curing the resin coating material by drying or the like.
The corrosion-resistant coating layer makes it difficult for moisture such as dew condensation water, oxygen, and ion species including chloride ions to penetrate into the aluminum plate, and suppresses corrosion of the aluminum plate and generation of aluminum oxide which generates odor.
As the hydrophobic resin in the corrosion-resistant coating film, conventionally known ones can be used. For example, various resins of polyester type, polyolefin type, epoxy type, urethane type, and acrylic type are exemplified, and one kind or a mixture of two or more kinds thereof can be applied.
The corrosion-resistant coating may contain other optional components in addition to the above components within a range not impairing the effects of the present invention. Examples of the optional component include various aqueous solvents and paint additives for improving the coatability, workability, and physical properties of the coating film.
Examples of the paint additive include a water-soluble organic solvent, a crosslinking agent, a surfactant, a surface modifier, a wetting dispersant, an anti-settling agent, an antioxidant, an antifoaming agent, a rust preventive, an antibacterial agent, and a mildewproofing agent. These coating additives may include one kind or two or more kinds.
The amount of the hydrophobic resin adhered to the corrosion-resistant coating is not particularly limited, but is preferably 0.01g/m from the viewpoint of providing sufficient corrosion resistance to the aluminum plate 2 Above, more preferably 0.05g/m 2 The above. On the other hand, from the viewpoint of suppressing a decrease in heat exchange efficiency of the fin, the amount of adhesion of the hydrophobic resin is preferably 8g/m 2 Hereinafter, more preferably 4g/m 2 The following.
The thickness of the corrosion-resistant coating is preferably 0.05 μm or more from the viewpoint of obtaining good corrosion resistance, and is preferably 4 μm or less from the viewpoint of obtaining good fin heat exchange efficiency by having good film forming properties, reducing defects such as cracks, and suppressing the thermal resistance of the corrosion-resistant coating to be low.
The film thickness of the corrosion-resistant film and the amount of the hydrophobic resin deposited can be adjusted by, for example, the concentration of the coating composition used for forming the corrosion-resistant film, and the selection of the bar coater No. used for forming the film.
(characteristics of aluminum Fin)
The surface of the aluminum fin material of the present embodiment exhibits very excellent hydrophilicity and oil repellency.
When the fin material is continuously used, it is preferable that the contact angle when the tetradecane is dropped onto the surface of the fin material is higher than 20 °, and the contact angle when the pure water is dropped is lower than 60 °, in view of compatibility between hydrophilicity and oil repellency. The contact angle when n-tetradecane is dropped is more preferably higher than 25 °, and the contact angle when pure water is dropped is more preferably lower than 40 °. Also, the contact angle can be measured, for example, with a goniometer.
The thickness of the fin material is not particularly limited, and varies depending on the application, and is preferably 0.08mm or more, and more preferably 0.1mm or more, from the viewpoint of strength that can be tolerated during processing when used in a heat exchanger, for example. The thickness is preferably 0.3mm or less, more preferably 0.2mm or less, from the viewpoint of workability and heat exchange efficiency.
Method for producing aluminum fin material
An example of the method for producing the aluminum fin material according to the present embodiment will be described, but the method is not limited to this, and the aluminum fin material may be produced by other production methods as long as the effects of the present embodiment are not impaired.
After an undercoat layer and a corrosion-resistant coating film are formed on an aluminum sheet as needed by a known method, a coating composition containing a hydrophilic resin and a surfactant is applied and dried to form a hydrophilic coating film. Next, a coating composition containing a silicone component and a functional resin as required is applied and dried to form a functional film.
When the hydrophilic coating film is formed, a surfactant having an alkyl chain having 16 or less carbon atoms as a lipophilic group is contained in the coating composition, whereby oil repellency by the functional coating film can be obtained and at the same time, excellent hydrophilicity can be achieved even when the functional coating film is provided.
In addition, when the functional coating film is formed, by adding a silicone component to the coating composition, good oil repellency can be imparted, and adhesion of contaminants including oil components can be suppressed.
The hydrophilic coating, the functional coating, and the corrosion-resistant coating are formed by preparing a coating composition for forming each coating, applying the coating composition to a coating object by a bar coater, a roll coating method, or the like, and performing a baking treatment. In particular, if the aluminum sheet is in the form of a roll, degreasing, coating, heating, winding, and the like are continuously performed using a roll coater or the like, which is preferable in terms of productivity. The baking temperature of the hydrophilic coating, the functional coating, and the corrosion-resistant coating may be set according to the components of the resin and the like used, and is preferably in the range of 120 to 270 ℃.
Examples
The present invention will be described more specifically below by way of examples and comparative examples, but the present invention is not limited to these examples, and can be modified and practiced within a range that can meet the spirit thereof, and all of these are included in the technical scope of the present invention.
(example 1)
As the aluminum plate, a plate having a thickness of 0.1mm was used in accordance with JIS H4000: 2014, alloy number 1200. On one side surface of the aluminum plate, a base treatment layer was formed by a phosphate chromate treatment. Then, a coating composition containing a resin for corrosion-resistant coating (acrylic resin, manufactured by Toyo Seisaku-Sho) was applied by a bar coater and baked to form a coating amount of 4mg/dm 2 The corrosion-resistant coating film of (3).
Next, an anionic surfactant having an alkyl chain of 12 to 13 carbon atoms (polyoxyethylene alkyl ether phosphate) and a resin composition including a sulfonic acid group-containing acrylic resin as a hydrophilic resin were applied to the surface of the corrosion-resistant film using a bar coater so that the amount of the hydrophilic resin and the amount of the surfactant adhered to the surface of the film were the values shown in table 1. Then, the resultant was baked at 200 ℃ to form a hydrophilic coating film having a thickness of 0.65 μm.
Finally, on the surface of the obtained hydrophilic film, a coating composition containing a nonionic epoxy/polyether-modified silicone emulsion as a silicone component and polyethylene glycol as a functional resin was applied to the surface of the hydrophilic film using a bar coater so that the amount of the functional resin and the amount of the silicone component adhered to the surface of the film were adjusted to values shown in table 1. Subsequently, the resultant was baked at 160 ℃ to form a functional film having a thickness of 0.06. Mu.m, thereby obtaining an aluminum fin.
(example 2)
An aluminum fin material was obtained in the same manner as in example 1 except that the surfactant in the hydrophilic coating film was changed to an anionic surfactant (polyoxyethylene alkyl ether phosphate) having an alkyl acid with 8 carbon atoms.
(example 3)
An aluminum fin material was obtained in the same manner as in example 1 except that the surfactant in the hydrophilic coating film was changed to a nonionic surfactant (polyoxyalkylene alkyl ether) having an alkyl acid with 10 carbon atoms.
(example 4)
An aluminum fin material was obtained in the same manner as in example 1 except that the surfactant in the hydrophilic coating film was changed to a cationic surfactant having 12 carbon atoms in the alkyl acid (N-ethyl-N, N-dimethyldodecylammonium ethyl sulfate).
Comparative example 1
An aluminum fin material was obtained in the same manner as in example 1 except that the surfactant in the hydrophilic coating film was changed to an anionic surfactant (polyoxyethylene alkyl ether phosphate) having an alkyl acid with 18 carbon atoms.
(examples 5 and 6)
An aluminum fin material was obtained in the same manner as in example 1, except that the amount of the surfactant adhered to the hydrophilic film was changed to the value shown in table 2, and the surface of the corrosion-resistant film was coated with the surfactant by using a bar coater.
(examples 7 and 8)
An aluminum fin material was obtained in the same manner as in example 1, except that the amount of the functional resin and the amount of the silicone component adhered to the functional film were changed to values shown in table 3, and the surface of the hydrophilic film was coated with the resin using a bar coater in this manner.
(examples 9 to 12)
An aluminum fin material was obtained in the same manner as in example 1, except that the amount of the hydrophilic resin and the amount of the surfactant adhered to the hydrophilic film were adjusted to values shown in table 4, and the surface of the corrosion-resistant film was coated with the resin using a bar coater in this manner.
The hydrophilicity and the pollutant adhesion inhibiting ability of the obtained aluminum fin material were evaluated by the following methods.
(hydrophilicity)
After 8 hours of immersion of the aluminum fin material in running water, it was dried in a heater set at 80 ℃ for 16 hours, which was taken as 1 cycle. After 14 cycles of such cycles, the aluminum fin material was placed with the evaluation surface facing upward and 1 to 3. Mu.L of ion-exchanged water was dropped onto the evaluation surface. The contact angle of the dropped water droplet was measured by a contact angle measuring apparatus (Drop Master, manufactured by synechia interfacial chemical corporation). The evaluation criteria are as follows, and the results are shown in tables 1 to 4.
A was very good (acceptable): contact angle lower than 40 °
B good (acceptable): the contact angle is more than 40 degrees and less than 60 degrees
C poor (failed): the contact angle is more than 60 degrees
(oil repellency)
After immersing the aluminum fin material in running water for 1 minute, it was dried in a heater set at 80 ℃ for 1 hour. An aluminum fin material was horizontally placed with its evaluation surface facing upward, and 1 to 3. Mu.L of n-tetradecane was dropped onto the evaluation surface. The contact angle of the dropped liquid droplet was measured by a contact angle measuring apparatus (CA-X150 model, manufactured by Kyowa Kagaku Co., ltd.). The evaluation criteria are as follows, and the results are shown in tables 1 to 4.
A is very good: contact angle higher than 25 °
B good (acceptable): the contact angle is higher than 20 degrees and below 25 degrees
C poor (failed): the contact angle is below 20 DEG
[ TABLE 1]
Figure BDA0003861523350000141
[ TABLE 2]
Figure BDA0003861523350000151
[ TABLE 3]
Figure BDA0003861523350000161
[ TABLE 4 ]
Figure BDA0003861523350000171
From the above results, it is found that by incorporating a surfactant having an alkyl chain having 16 or less carbon atoms as a lipophilic group into the hydrophilic coating film, oil repellency having an excellent effect of inhibiting the adhesion of contaminants and extremely excellent hydrophilicity can be achieved at the same time. Since the hydrophilicity tends to be more favorable by increasing the amount of the surfactant deposited in the hydrophilic coating, and the water repellency tends to be lowered, it is more preferable to select a preferable amount of the surfactant, depending on the type of the surfactant. Further, by finely adjusting the balance between the amount of the functional resin deposited and the amount of the silicone component deposited in the functional film, or by adjusting the amount of the hydrophilic resin deposited in the hydrophilic film, both hydrophilicity and oil repellency can be improved.
While various embodiments have been described above with reference to the drawings, it is needless to say that the present invention is not limited to such examples. Various alterations and modifications within the scope described in the patent claims will no doubt be suggested to those skilled in the art, and such alterations and modifications are certainly contemplated as falling within the technical scope of the present invention. The respective components of the above embodiments may be arbitrarily combined without departing from the scope of the invention.
The present application is based on Japanese patent application No. 2020-060863 (filed on 3/30/2020), the contents of which are incorporated herein by reference.
Description of the symbols
1. Aluminium plate
2. Hydrophilic coating
3. Functional skin membrane
10. Aluminum fin material

Claims (8)

1. An aluminum fin material comprising, in order, an aluminum plate, a hydrophilic coating film and a functional coating film,
the hydrophilic coating contains a surfactant and a hydrophilic resin,
the functional coating film contains a silicone component,
the surfactant has an alkyl chain as a lipophilic group, and the number of carbons in the alkyl chain is 16 or less.
2. The aluminum fin sheet according to claim 1, wherein the surfactant is an anionic surfactant.
3. The aluminum fin material according to claim 2, wherein the anionic surfactant comprises at least one compound selected from the group consisting of polyoxyethylene alkyl ether phosphate, polyoxyethylene alkyl ether sulfate, and polyoxyethylene alkyl sulfosuccinate.
4. The aluminum fin material according to claim 1 or 2, wherein an amount of the surfactant adhered to the hydrophilic coating film is 0.0003 to 0.7g/m 2 。
5. The aluminum fin material according to claim 1 or 2, wherein an amount of adhesion of the silicone component in the functional coating film is 0.0010 to 1.0g/m 2 。
6. The aluminum fin material according to claim 1 or 2, wherein an amount of the hydrophilic resin adhered to the hydrophilic coating film is 0.05 to 5g/m 2 。
7. The aluminum fin material according to claim 1 or 2,
the functional coating is a lubricating coating containing a lubricating component,
the amount of the lubricating component adhered to the lubricating film is 0.05 to 5g/m 2 。
8. The aluminum fin material according to claim 1 or 2,
a corrosion-resistant coating is further provided between the aluminum plate and the hydrophilic coating,
the corrosion-resistant coating film contains a hydrophobic resin.
CN202180024118.6A 2020-03-30 2021-03-03 Aluminum fin material Pending CN115315609A (en)

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JPH0643579B2 (en) * 1988-03-02 1994-06-08 関西ペイント株式会社 Hydrophilizing agent for heat exchanger fin materials
WO1997035938A1 (en) 1996-03-28 1997-10-02 Nippon Light Metal Company, Ltd. Water-based hydrophilic coating agent and process for producing precoated fin for heat exchanger by using the agent
JP2006176855A (en) 2004-12-24 2006-07-06 Mitsubishi Paper Mills Ltd Method for producing aluminum fin material for heat exchanger
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