WO2022215374A1 - Matériau d'ailette en aluminium - Google Patents

Matériau d'ailette en aluminium Download PDF

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Publication number
WO2022215374A1
WO2022215374A1 PCT/JP2022/007234 JP2022007234W WO2022215374A1 WO 2022215374 A1 WO2022215374 A1 WO 2022215374A1 JP 2022007234 W JP2022007234 W JP 2022007234W WO 2022215374 A1 WO2022215374 A1 WO 2022215374A1
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Prior art keywords
fin material
hydrophilic
film layer
aluminum
coating layer
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PCT/JP2022/007234
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English (en)
Japanese (ja)
Inventor
亮介 角田
慶太 館山
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株式会社神戸製鋼所
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Application filed by 株式会社神戸製鋼所 filed Critical 株式会社神戸製鋼所
Priority to CN202280027087.4A priority Critical patent/CN117120795A/zh
Publication of WO2022215374A1 publication Critical patent/WO2022215374A1/fr

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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
    • 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
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal

Definitions

  • the present invention relates to an aluminum fin stock, and more particularly to an aluminum fin stock suitable for use in heat exchangers such as air conditioners.
  • Heat exchangers are used in products in various fields such as room air conditioners, package air conditioners, freezer showcases, refrigerators, oil coolers, and radiators.
  • Aluminum and aluminum alloys which are excellent in thermal conductivity, workability, corrosion resistance, etc., are generally used as materials for fins of heat exchangers.
  • a plate-fin type or plate-and-tube type heat exchanger has a structure in which fins are arranged side by side at narrow intervals.
  • Patent Document 1 proposes a technique of coating and forming a hydrophilic film on the surface of a fin.
  • fins are manufactured through processing such as press molding, and processing oil is used during processing, such as using press oil in press molding.
  • processing oil is used during processing, such as using press oil in press molding.
  • a corrosion-resistant film and an acrylic resin are applied on an aluminum substrate for the purpose of preventing color fading.
  • An aluminum fin material for a heat exchanger is disclosed in which a hydrophilic coating made of a constituent material and a water-soluble lubricant layer made of polyethylene glycol are sequentially formed.
  • heating is performed for the purpose of volatilizing the processing oil applied to the aluminum fin material.
  • the coating film provided on the aluminum plate is thermally deteriorated, resulting in a decrease in hydrophilicity.
  • Heating is also performed when a copper pipe is inserted into the processed aluminum fin material and the copper pipes are joined together. Excessive heat is also applied to the aluminum fin material due to the heating during the bonding, and the hydrophilicity of the coating film is lowered.
  • an object of the present invention is to provide an aluminum fin material that suppresses a decrease in hydrophilicity due to heating and has excellent heat resistance.
  • the present invention relates to the following [1] to [5].
  • An aluminum plate and a coating layer wherein the coating layer comprises, in order from the aluminum plate side, a hydrophilic coating layer and a lubricating coating layer, and the lubricating coating layer contains polyethylene glycol. as a main component, and a hydrophilic component containing at least one of a sulfonic acid group and an ester group, and the hydrophilic component contributes to hydrophilicity before and after heating at 200 ° C. for 10 minutes.
  • An aluminum fin material having a change in the amount of functional groups of 15% or less.
  • the present invention even after heating when processing a heat exchanger or when inserting a copper tube into an aluminum fin material and joining the copper tubes together, the decrease in hydrophilicity on the surface of the aluminum fin material is suppressed. can. As a result, it is possible to provide an aluminum fin material that prevents water splashing and reduces draft resistance over a long period of time without losing the original hydrophilic effect of the aluminum fin material due to processing or the like.
  • FIG. 1 is a schematic cross-sectional view showing one aspect of the configuration of the aluminum fin material.
  • An aluminum fin material (hereinafter sometimes simply referred to as "fin material") 10 has an aluminum plate 1 and a coating layer 2, as shown in FIG.
  • the coating layer 2 includes, in order from the aluminum plate 1 side, a hydrophilic coating layer 2b and a lubricating coating layer 2c.
  • the coating layer 2 may further include a corrosion-resistant coating layer 2a. When the corrosion-resistant coating layer 2a is provided, it is positioned between the aluminum plate 1 and the hydrophilic coating layer 2b.
  • a surface treatment layer (not shown) may be further provided between the aluminum plate 1 and the coating layer 2 .
  • At least one surface of the aluminum plate 1 may have the above structure, and both surfaces of the aluminum plate 1 may have the above structure. Moreover, when both surfaces of the aluminum plate 1 have the above structure, the two surfaces do not need to have the same configuration.
  • the lubricating coating layer 2c includes a resin matrix containing polyethylene glycol as a main component, and a hydrophilic component containing at least one of a sulfonic acid group and an ester group.
  • the hydrophilic component has a change of 15% or less in the amount of functional groups contributing to hydrophilicity before and after heating at 200° C. for 10 minutes.
  • the lubricating coating layer 2c is a layer intended to lubricate the surface of the fin material and obtain good workability. Since the lubricating film layer 2c has the above structure, the hydrophilic effect of the aluminum fin material 10 can be maintained without being lost by heating or the like, and the heat resistance is excellent.
  • good workability can be achieved by setting the content of the hydrophilic component to the resin matrix in an appropriate range.
  • good workability and properties such as hydrophilicity for preventing water splashing and reducing airflow resistance can be compatible and improved without inhibiting each other.
  • the aluminum plate 1 is a concept including a plate made of aluminum and a plate made of an aluminum alloy, and an aluminum plate conventionally used for aluminum fin materials can be used.
  • the thickness of the aluminum plate 1 is appropriately desired according to the application and specifications of the fin material.
  • the thickness is preferably 0.08 mm or more, more preferably 0.1 mm or more, from the viewpoint of the strength of the fins.
  • the thickness is preferably 0.3 mm or less, more preferably 0.2 mm or less, from the viewpoint of workability into fins, heat exchange efficiency, and the like.
  • the lubricating coating layer 2c is a layer for the purpose of obtaining good workability by increasing the lubricating properties of the surface of the fin material. Specifically, by containing a resin that enhances lubricity, the coefficient of friction of the surface of the fin material is reduced, the surface becomes lubricated, and the press formability when processing the fin material into fins is improved.
  • Lubricating coating layer 2c includes a resin matrix and a hydrophilic component.
  • the resin matrix is a resin component that serves as a base composition for forming the lubricating coating layer 2c.
  • the content of the resin matrix in the lubricating coating layer 2c is preferably 60% by mass or more with respect to the total amount of components constituting the lubricating coating layer 2c.
  • the upper limit of the content of the resin matrix is not particularly limited, it is, for example, 70% by mass or less.
  • the resin matrix contains polyethylene glycol (PEG) as the main component.
  • polyethylene glycol (PEG) in this specification also includes modified compounds thereof.
  • a modified polyethylene glycol compound is a modified polyethylene glycol having in its structure at least one functional group selected from the group consisting of a urethane bond, an ester bond and an ether bond. Among them, modified polyethylene glycol having a urethane bond in its structure is preferable because it has a functional group with excellent elongation.
  • the resin constituting the resin matrix may be polyethylene glycol only, or may contain resins other than polyethylene glycol.
  • Other resins include, for example, resins having hydrophilic groups, and examples of hydrophilic groups include hydroxyl groups, carboxyl groups, sulfonic acid groups, polyether groups, and the like.
  • Resins with hydroxyl groups other than polyethylene glycol (PEG) include polyvinyl alcohol (PVA).
  • PVA polyvinyl alcohol
  • PAA Polyacrylic acid
  • CMC Carboxymethyl cellulose
  • Those having a sulfonic acid group include sulfoethyl acrylate and the like.
  • copolymers of two or more monomers having hydrophilic groups can also be applied.
  • the resin matrix may contain other resins than polyethylene glycol, but to contain polyethylene glycol as a main component means that the ratio of polyethylene glycol to the total amount of polyethylene glycol and other resins is 60% by mass or more. It means that there is When two or more kinds of polyethylene glycols having different molecular weights and structures are included as polyethylene glycol, the total ratio thereof should be 60% by mass or more.
  • the ratio of polyethylene glycol to the total amount of polyethylene glycol and other resins is preferably 70% by mass or more, more preferably 80% by mass or more.
  • the upper limit may be 100% by mass, that is, it may be composed only of polyethylene glycol.
  • the hydrophilic component contained in the lubricating film layer 2c contains at least one of a sulfonic acid group and an ester group. This hydrophilic component has a change of 15% or less in the amount of functional groups contributing to hydrophilicity before and after heating at 200° C. for 10 minutes. By containing such a hydrophilic component, hydrophilicity with excellent heat resistance can be obtained.
  • hydrophilic components examples include sulfonic acid acrylic compounds, phosphate ester compounds, and acrylic compounds. However, as described above, it is necessary that the change in the amount of functional groups contributing to hydrophilicity before and after heating at 200° C. for 10 minutes is 15% or less.
  • the change in the amount of functional groups contributing to hydrophilicity before and after heating at 200° C. for 10 minutes may be 15% or less, preferably 10% or less, more preferably 5% or less.
  • the change in the amount of functional groups that contribute to hydrophilicity can be measured using a Fourier transform infrared spectrophotometer.
  • the content of the hydrophilic component with respect to 100 parts by mass of the resin matrix is preferably 2.0 parts by mass or more, more preferably 5.0 parts by mass or more, and further preferably 6.0 parts by mass or more. It is preferably 8.0 parts by mass or more, and particularly preferably 10 parts by mass or more.
  • the content of the hydrophilic component is preferably 6000 parts by mass or less, more preferably 5000 parts by mass or less, further preferably 4000 parts by mass or less, and 3000 parts by mass or less. is even more preferred.
  • the lubricating coating layer 2c may contain other optional components within a range that does not impair the effects of the present invention.
  • optional components include various water-based solvents and paint additives for improving paintability, workability, physical properties of the film layer, and the like. Paint additives include, for example, water-soluble organic solvents, cross-linking agents, surfactants, surface conditioners, wetting and dispersing agents, anti-settling agents, antioxidants, anti-foaming agents, anti-fouling agents, anti-rust agents, anti-bacterial agents. , antifungal agents, and the like. One of these paint additives may be contained, or two or more thereof may be contained.
  • an antifouling agent is a silicone component.
  • the silicone component has a small surface free energy and is considered to have low substance adhesion. Therefore, by containing a silicone component, adhesion of contaminants, mainly oily components, can be suppressed.
  • a silicone component is a polymer of a silicon compound and is a compound having a siloxane bond as a skeleton. Since the silicone component has particularly high dispersibility in paint and high fixability in resin film, it has one or more functional groups selected from polyether groups, epoxy groups, methacrylic groups, amino groups, phenyl groups, hydrogen groups, and hydroxyl groups. In the structure, it preferably contains a modified polydimethylsiloxane derivative having in the structure one or more functional groups selected from the group consisting of an epoxy group, a methacrylic group, a phenyl group and a hydrogen group. More preferably it contains a derivative. Also preferred are silicones containing long-chain alkyl groups. Such modified polydimethylsiloxane derivatives and long-chain alkyl group-containing silicones may be nonionic, anionic or cationic, with nonionic being preferred.
  • the lubricating film layer 2c can be formed by applying a resin paint containing a resin matrix and a hydrophilic component onto the hydrophilic film layer 2b and solidifying it by drying or the like.
  • the coating amount of the lubricating coating layer 2c is preferably 0.05 mg/dm 2 or more, more preferably 0.1 mg/dm 2 or more, more preferably 0.2 mg/dm 2 or more, from the viewpoint of obtaining sufficient lubricity and heat-resistant hydrophilicity. 2 or more is more preferable.
  • the amount of the coating is 3.0% from the viewpoint of suppressing the decrease in hydrophilicity due to the part of the components constituting the lubricating coating layer 2c remaining on the surface. 0 mg/dm 2 or less is preferable, 1.5 mg/dm 2 or less is more preferable, and 1.0 mg/dm 2 or less is even more preferable.
  • the thickness of the lubricating coating layer 2c is not particularly limited, but from the viewpoint of obtaining lubricity and heat-resistant hydrophilicity, assuming that the density of the coating layer is 1 g/cm 3 , the thickness is preferably 0.005 ⁇ m or more, and 0.01 ⁇ m. 0.02 ⁇ m or more is more preferable. From the viewpoint of obtaining good coating workability when forming the lubricating coating layer 2c, the thickness is preferably 0.3 ⁇ m or less, more preferably 0.15 ⁇ m or less, and even more preferably 0.1 ⁇ m or less.
  • the thickness of the lubricating coating layer 2c depends on the concentration of the coating composition used for forming the lubricating coating layer 2c and the bar coater No. can be adjusted by selecting
  • the hydrophilic film layer 2b is a film layer that imparts hydrophilicity to the surface of the fin material, and contains a conventionally known hydrophilic resin.
  • the hydrophilic resin only needs to have a hydrophilic group, and may contain one resin or two or more resins.
  • Hydrophilic groups include, for example, hydroxyl groups (hydroxy groups), carboxyl groups, sulfonic acid groups, polyether groups, and the like.
  • Examples of those having hydroxyl groups include polyethylene glycol (PEG) and polyvinyl alcohol (PVA).
  • Polyacrylic acid (PAA) etc. are mentioned as what has a carboxyl group.
  • Carboxymethyl cellulose (CMC) etc. are mentioned as what has a hydroxyl group and a carboxyl group.
  • Those having a sulfonic acid group include sulfoethyl acrylate and the like.
  • Those having a polyether group include polyethylene glycol (PEG) and the like.
  • the hydrophilic resin includes those containing sulfonic acid groups, polyether groups, That is, those containing ether bonds are preferred, those containing sulfonic acid groups and ether bonds are more preferred, and acrylic acid resins containing sulfonic acid groups and ether bonds are particularly preferred.
  • the acrylic acid resin containing a sulfonic acid and an ether bond is an acrylic acid resin containing an unsaturated double bond group and a sulfonic acid group.
  • a polymer etc. are mentioned.
  • acrylic acid resins containing sulfonic acid and ether bonds are not limited to these.
  • a copolymer of two or more monomers having a hydrophilic group can also be used as the hydrophilic resin.
  • examples include copolymers of acrylic acid and sulfoethyl acrylate.
  • the copolymer may be an alternating copolymer, a block copolymer, a graft copolymer, a random copolymer, or the like, and the method of arranging the monomers is not particularly limited.
  • the hydrophilic film layer 2b preferably contains a surfactant in addition to the hydrophilic resin. Thereby, it is possible to achieve both workability due to the lubricating coating layer 2c formed on the hydrophilic coating layer 2b and better hydrophilicity. This is considered to be due to the expression action of the surfactant.
  • anionic surfactants Any of anionic, cationic, and nonionic surfactants can be used, but anionic surfactants are preferred from the viewpoint of ease of dispersion in the hydrophilic film layer.
  • anionic surfactants include at least one compound selected from the group consisting of polyoxyethylene alkyl ether phosphates, polyoxyethylene alkyl ether sulfates, and polyoxyethylene alkyl sulfosuccinates. , is more preferable from the viewpoint of improving hydrophilicity.
  • the hydrophilic film layer 2b can be formed by applying a resin paint containing a hydrophilic resin onto a layer to be the lower layer of the corrosion-resistant film layer 2a, etc., and solidifying it by drying or the like.
  • the adhesion amount of the hydrophilic resin in the hydrophilic film is preferably 0.2 mg/dm 2 or more, more preferably 1 mg/dm 2 or more, and even more preferably 2 mg/dm 2 or more.
  • the adhesion amount of the hydrophilic resin should be 30 mg/dm 2 or less. It is preferably 20 mg/dm 2 or less, more preferably 15 mg/dm 2 or less.
  • the hydrophilic film layer 2b may contain other optional components within a range that does not impair the effects of the present invention.
  • optional components include various water-based solvents and paint additives for improving paintability, workability, physical properties of the film layer, and the like. Paint additives include, for example, water-soluble organic solvents, cross-linking agents, surface conditioners, wetting and dispersing agents, anti-settling agents, antioxidants, anti-foaming agents, anti-rust agents, anti-bacterial agents, anti-mold agents and the like. .
  • Paint additives include, for example, water-soluble organic solvents, cross-linking agents, surface conditioners, wetting and dispersing agents, anti-settling agents, antioxidants, anti-foaming agents, anti-rust agents, anti-bacterial agents, anti-mold agents and the like.
  • One of these paint additives may be contained, or two or more thereof may be contained.
  • the thickness of the hydrophilic film layer 2b is not particularly limited, but assuming that the density of the hydrophilic film layer 2b is 1 g/cm 3 , the thickness is preferably 0.02 ⁇ m or more from the viewpoint of obtaining good hydrophilicity, and 0.02 ⁇ m or more. 1 ⁇ m or more is more preferable, and 0.2 ⁇ m or more is even more preferable. From the viewpoint of obtaining good coating workability when forming the hydrophilic film layer 2b, the thickness is preferably 3 ⁇ m or less, more preferably 2 ⁇ m or less, and even more preferably 1.5 ⁇ m or less.
  • the thickness of the hydrophilic film layer 2b depends on the concentration of the coating composition used for forming the hydrophilic film layer 2b and the bar coater No. can be adjusted by selecting
  • the total thickness of the hydrophilic coating layer 2b and the lubricating coating layer 2c is preferably 5 ⁇ m or less from the viewpoint of suppressing a decrease in the heat exchange efficiency of the fin material.
  • the corrosion-resistant coating layer 2a may be provided mainly to increase the corrosion resistance of the aluminum plate, is preferably formed between the aluminum plate 1 and the hydrophilic coating layer 2b, and contains a hydrophobic resin. is more preferred.
  • a surface treatment layer (not shown) is formed on the surface of the aluminum plate 1, the corrosion-resistant film layer 2a is formed on the surface treatment layer.
  • the corrosion-resistant coating layer 2a can be formed, for example, by coating a resin coating containing a hydrophobic resin on the aluminum plate 1 or the undercoating layer and solidifying the coating by drying or the like.
  • the corrosion-resistant film layer 2a makes it difficult for moisture such as condensed water, oxygen, ion species such as chloride ions, etc., to enter the aluminum plate 1, causing corrosion of the aluminum plate 1 and generation of aluminum oxides that generate odors. is suppressed.
  • polyester-based, polyolefin-based, epoxy-based, urethane-based, and acrylic-based resins can be used, and one or a mixture of two or more of these can be used.
  • the corrosion-resistant coating layer 2a may contain other optional components within a range that does not impair the effects of the present invention.
  • optional components include various water-based solvents and paint additives for improving paintability, workability, film physical properties, and the like.
  • paint additives include water-soluble organic solvents, cross-linking agents, surfactants, surface conditioners, wetting and dispersing agents, anti-settling agents, antioxidants, anti-foaming agents, anti-rust agents, anti-bacterial agents, anti-mold agents. etc.
  • One of these paint additives may be contained, or two or more thereof may be contained.
  • the adhesion amount of the hydrophobic resin in the corrosion-resistant film layer 2a is not particularly limited, but from the viewpoint of imparting sufficient corrosion resistance to the aluminum plate 1, it is preferably 1.0 mg/dm 2 or more, more preferably 3.0 mg/dm 2 or more. .
  • the adhesion amount of the hydrophobic resin is preferably 50 mg/dm 2 or less, more preferably 40 mg/dm 2 or less.
  • the thickness of the corrosion-resistant coating layer 2a is preferably 0.05 ⁇ m or more from the viewpoint of obtaining good corrosion resistance.
  • the thickness is 4 ⁇ m or less from the viewpoint that film formation is good, defects such as cracks are reduced, the heat transfer resistance of the corrosion-resistant film layer 2a is kept low, and good heat exchange efficiency of the fin is obtained. preferable.
  • the thickness of the corrosion-resistant film layer 2a and the amount of hydrophobic resin adhered depend on the concentration of the coating composition used for forming the corrosion-resistant film layer 2a and the bar coater number. can be adjusted by selecting
  • a surface treatment layer can be provided between the aluminum plate 1 and the corrosion-resistant coating layer 2a, if desired. By providing the surface treatment layer, the corrosion resistance of the aluminum plate 1 can be enhanced, and the adhesion between the aluminum plate 1 and the corrosion-resistant coating layer 2a can be enhanced.
  • a conventionally known layer can be used as the surface treatment layer as long as it can impart corrosion resistance to the aluminum plate 1 .
  • layers made of inorganic oxides or inorganic-organic composite compounds can be used. Chromium (Cr), zirconium (Zr), or titanium (Ti) is preferable as the main component of the inorganic material constituting the inorganic oxide or the inorganic-organic composite compound.
  • the layer made of an inorganic oxide that serves as a base treatment layer is formed by, for example, subjecting the aluminum plate 1 to chromate phosphate treatment, zirconium phosphate treatment, zirconium oxide treatment, chromate chromate treatment, zinc phosphate treatment, phosphate titanate treatment, or the like. It can be formed by doing. However, the types of inorganic oxides are not limited to those formed by these treatments.
  • a layer composed of an inorganic-organic composite compound that serves as a base treatment layer can be formed, for example, by subjecting the aluminum plate 1 to coating-type chromate treatment, coating-type zirconium treatment, or the like.
  • Specific examples of such inorganic-organic composite compounds include acryl-zirconium composites.
  • the film thickness and the like of the undercoating layer are not particularly limited and may be set as appropriate, but are formed so that the adhesion amount per unit area is 1 to 100 mg/m 2 in terms of metal (Cr, Zr, Ti). and the film thickness is preferably 1 to 100 nm.
  • the adhesion amount and film thickness of the undercoat layer can be adjusted by adjusting the concentration of the chemical conversion treatment liquid used for forming the undercoat layer and the film formation processing time.
  • the surface of the aluminum plate 1 may be degreased in advance using an alkaline degreasing solution, which improves the reactivity of the undercoat and further enhances the adhesion of the formed undercoat layer. also improve.
  • the aluminum fin material 10 according to the present embodiment can suppress a decrease in hydrophilicity on the surface of the fin material even after being processed or heated during insertion of a copper pipe. Also, by setting the content of the hydrophilic component to the resin matrix in the lubricating coating layer 2c within an appropriate range, it is possible to achieve good workability.
  • the workability of the lubricating film layer 2c of the fin material 10 can be evaluated by the coefficient of friction.
  • the coefficient of static friction measured by a horizontal linear reciprocating sliding method with the processing oil applied to the surface of the fin material 10 is preferably 0.20 or less, more preferably 0.15 or less, and even more preferably 0.10 or less. .
  • the lower limit is not particularly limited, it is usually 0.01 or more.
  • the static friction coefficient measured by the horizontal linear reciprocating sliding method is preferably 0.20 or less, more preferably 0.17 or less, and 0.15 or less. More preferably, 0.12 or less is even more preferable.
  • the lower limit is not particularly limited, it is usually 0.01 or more.
  • the heat resistance related to the hydrophilicity of the fin material 10 can be evaluated by the contact angle when pure water is dropped on the surface of the fin material 10 after the fin material 10 is heated.
  • the contact angle of pure water is measured using a contact angle measuring instrument. Processing oil is applied to the surface of the fin material 10 and heated at 200° C. for 10 minutes. 5 ⁇ L of pure water is added dropwise.
  • the contact angle of a droplet (pure water) is preferably 22° or less, more preferably 20° or less, and even more preferably 15° or less. Although the lower limit is not particularly limited, it is usually 5° or more.
  • the durability when the fin material 10 is used in a heat exchanger can be evaluated by the contact angle of pure water after passing through the dry-wet cycle.
  • Processing oil is applied to the surface of the fin material 10, heated at 200 ° C. for 10 minutes, and the fin material 10 returned to room temperature is subjected to the following steps (i) and (ii) as one cycle. for 14 cycles. After that, the temperature is returned to room temperature, and about 0.5 ⁇ L of pure water is dropped on the surface of the fin material 10 .
  • the contact angle of a droplet (pure water) is preferably 22° or less, more preferably 20° or less, and even more preferably 19° or less. Although the lower limit is not particularly limited, it is usually 5° or more.
  • the fin material is exposed to deionized water at a flow rate of 0.1 mL/min for 8 hours. (ii) then dried at 80° C. for 16 hours;
  • the thickness of the fin material 10 varies depending on the application and is not particularly limited, but when used in a heat exchanger, for example, it is preferably 0.08 mm or more, more preferably 0.1 mm or more, from the standpoint of strength that can withstand processing. In terms of workability and heat exchange efficiency, the thickness is preferably 0.3 mm or less, more preferably 0.2 mm or less.
  • a hydrophilic resin-containing coating composition is applied and dried to form the hydrophilic film layer 2b.
  • a surface treatment layer may be formed as desired.
  • a lubricating coating layer 2c is formed by coating a resin coating containing a resin matrix and a hydrophilic component on the hydrophilic coating layer 2b and drying it.
  • the resin matrix contained in the resin paint when forming the lubricating film layer 2c contains polyethylene glycol as a main component.
  • the hydrophilic component contained in the resin coating contains at least one of a sulfonic acid group and an ester group. This hydrophilic component has a change of 15% or less in the amount of functional groups contributing to hydrophilicity before and after heating at 200° C. for 10 minutes.
  • Lubricating coating layer 2c is formed on the surface of hydrophilic coating layer 2b by incorporating an acrylic acid resin containing sulfonic acid groups and ether bonds into the coating composition when forming hydrophilic coating layer 2b.
  • an acrylic acid resin containing sulfonic acid groups and ether bonds into the coating composition when forming hydrophilic coating layer 2b.
  • the desired hydrophilicity can be more suitably expressed.
  • the lubricating coating layer 2c, the hydrophilic coating layer 2b, and the corrosion-resistant coating layer 2a are prepared by preparing a coating composition constituting each coating layer, applying it to the coating object by a bar coater, roll coating method, etc., and baking it. formed by applying
  • a bar coater, roll coating method, etc. it is preferable from the standpoint of productivity to apply a roll coater or the like to continuously perform degreasing, coating, heating, winding, and the like.
  • the baking temperature of the lubricating film layer 2c, the hydrophilic film layer 2b, and the corrosion-resistant film layer 2a may be set according to the components of the resins and the like used, for example, in the range of 120 to 270°C. preferable.
  • Example 1 As an aluminum plate, a standard alloy number 1070 specified in JIS H 4000:2014 with a thickness of 0.1 mm was used. An undercoating layer was formed on one surface of the aluminum plate by phosphoric acid chromate treatment. The coating amount of the undercoating layer was 20 mg/dm 2 . Then, a coating composition containing an epoxy resin was applied with a bar coater and baked at 200° C. to form a corrosion-resistant coating layer. The coating amount of the corrosion-resistant coating layer was 7.5 mg/dm 2 .
  • a resin composition containing a sulfonic acid group-containing ether-based acrylic compound as a hydrophilic resin as a main component was applied to the surface of the corrosion-resistant film layer using a bar coater.
  • a hydrophilic coating layer was formed by baking at 220°C.
  • the coating amount of the hydrophilic coating layer was 6 mg/dm 2 .
  • a resin paint obtained by adding a sulfonic acid acrylic compound as a hydrophilic component (B) to a modified polyethylene glycol as a resin matrix (A) is applied with a bar coater, By baking at 160° C., a lubricating film layer was formed to obtain an aluminum fin stock.
  • the amount of the sulfonic acid acrylic compound added is 6 parts by mass with respect to 100 parts by mass of the modified polyethylene glycol.
  • the coating amount of the lubricating coating layer was set to 1.0 mg/dm 2 .
  • Examples 2 to 15 In the formation of the lubricating coating layer, the addition amount of the sulfonic acid acrylic compound as the hydrophilic component (B) with respect to 100 parts by mass of the modified polyethylene glycol as the resin matrix (A) was changed to the amount shown in Table 1. obtained an aluminum fin material in the same manner as in Example 1.
  • Example 16 In the formation of the lubricating film layer, as the hydrophilic component (B), instead of the sulfonic acid acrylic compound, a phosphoric acid ester compound was added in the amount shown in Table 1. A fin material was obtained.
  • Example 2 In the formation of the lubricating coating layer, the same procedure as in Example 1 was carried out, except that the modified polyethylene glycol serving as the resin matrix (A) was not used, and a layer consisting only of the sulfonic acid acrylic compound serving as the hydrophilic component (B) was formed. A fin stock made of aluminum was obtained.
  • Example 17 An aluminum fin material was obtained in the same manner as in Example 1, except that the coating amount of the lubricating coating layer was 0.2 mg/dm 2 in the formation of the lubricating coating layer.
  • Example 18 In the formation of the lubricating coating layer, the addition amount of the sulfonic acid acrylic compound as the hydrophilic component (B) with respect to 100 parts by mass of the modified polyethylene glycol as the resin matrix (A) was changed to the amount shown in Table 2. obtained an aluminum fin material in the same manner as in Example 17.
  • Example 6 In the formation of the lubricating coating layer, the procedure was the same as in Example 17, except that the modified polyethylene glycol serving as the resin matrix (A) was not used, and a layer consisting only of the sulfonic acid acrylic compound serving as the hydrophilic component (B) was formed. A fin stock made of aluminum was obtained.
  • the intensity ratio between the peak near 1510 cm ⁇ 1 indicating functional groups that contribute to hydrophilicity and the peak near 2900 cm ⁇ 1 indicating functional groups that do not contribute to hydrophilicity was determined as the amount of functional groups in the component A Assuming that the functional group amount A in the component before heating is the standard (1), the amount of change in the functional group amount A in the component after heating at 200 ° C. for 10 minutes is 15% or less (0 .85 or more). The results are shown in Tables 1 and 2, "Functional Group Variation (%) of Lubricating Coating Layer (B)".
  • the static friction coefficient was measured in the same manner as described above, except that the surface of the fin material was not coated with working oil.
  • the evaluation criteria are as follows, and the results are shown in Tables 1 and 2, "Coefficient of Friction, No Oil Application". In addition, a blank means that it is not measured.
  • the durability of the fin material when used in a heat exchanger was evaluated as follows based on the contact angle of pure water after passing through a dry-wet cycle. A working oil was applied to the surface of the fin material, heated at 200° C. for 10 minutes, and returned to room temperature. Then, (i) exposing the fin material to ion-exchanged water at a flow rate of 0.1 mL/min for 8 hours, and (ii) then drying at 80°C for 16 hours. rice field. After that, the temperature was returned to room temperature, and about 0.5 ⁇ L of pure water was dropped on the surface of the fin material.
  • the contact angle of the droplet was measured using a contact angle measuring instrument (manufactured by Kyowa Interface Science Co., Ltd., model CA-05).
  • the evaluation criteria are as follows, and the results are shown in Tables 1 and 2, "Contact angle after dry-wet cycle". In addition, a blank means that it is not measured.
  • C Poor (fail) contact angle is more than 22 °

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Abstract

La présente invention concerne un matériau d'ailette en aluminium pouvant inhiber la diminution du caractère hydrophile due au chauffage, et présentant en même temps une excellente résistance à la chaleur. Selon la présente invention, le matériau d'ailette en aluminium (10) comprend une plaque d'aluminium (1) et une couche de film de revêtement (2) ; la couche de film de revêtement (2) comprend successivement, à partir du côté plaque d'aluminium (1), une couche de film de revêtement hydrophile (2b) et une couche de film de revêtement lubrifiant (2c) ; la couche de film de revêtement lubrifiant (2c) contient une matrice de résine contenant un polyéthylène glycol en tant que constituant principal, et un constituant hydrophile contenant un groupe acide sulfonique et/ou un groupe ester ; et par rapport au constituant hydrophile, la variation de la quantité d'un groupe fonctionnel contribuant au caractère hydrophile, entre avant et après le chauffage à 200 °C pendant 10 minutes, est égale ou inférieure à 15 %. Simultanément, la couche de film de revêtement (2) peut comprendre en outre une couche de film de revêtement résistant à la corrosion (2a).
PCT/JP2022/007234 2021-04-09 2022-02-22 Matériau d'ailette en aluminium WO2022215374A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002275407A (ja) * 2001-03-16 2002-09-25 Nippon Light Metal Co Ltd 有機親水性塗料組成物及び親水性皮膜を有する熱交換器用アルミニウム材
JP2003286583A (ja) * 2002-03-29 2003-10-10 Kobe Steel Ltd 熱交換器用アルミニウム製フィン材およびフィン
JP2010155441A (ja) * 2009-01-05 2010-07-15 Fujifilm Corp 親水性部材及び熱交換器用フィン材の製造方法
JP2013130320A (ja) * 2011-12-20 2013-07-04 Mitsubishi Alum Co Ltd 熱交換器用アルミニウムフィン材

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002275407A (ja) * 2001-03-16 2002-09-25 Nippon Light Metal Co Ltd 有機親水性塗料組成物及び親水性皮膜を有する熱交換器用アルミニウム材
JP2003286583A (ja) * 2002-03-29 2003-10-10 Kobe Steel Ltd 熱交換器用アルミニウム製フィン材およびフィン
JP2010155441A (ja) * 2009-01-05 2010-07-15 Fujifilm Corp 親水性部材及び熱交換器用フィン材の製造方法
JP2013130320A (ja) * 2011-12-20 2013-07-04 Mitsubishi Alum Co Ltd 熱交換器用アルミニウムフィン材

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