WO2006095514A1 - Echangeur thermique, appareil a cycle de refrigeration, et revetement destine a etre utilise dans ceux-ci - Google Patents

Echangeur thermique, appareil a cycle de refrigeration, et revetement destine a etre utilise dans ceux-ci Download PDF

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Publication number
WO2006095514A1
WO2006095514A1 PCT/JP2006/301797 JP2006301797W WO2006095514A1 WO 2006095514 A1 WO2006095514 A1 WO 2006095514A1 JP 2006301797 W JP2006301797 W JP 2006301797W WO 2006095514 A1 WO2006095514 A1 WO 2006095514A1
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WO
WIPO (PCT)
Prior art keywords
acid
paint
coating film
heat exchanger
polyvalent carboxylic
Prior art date
Application number
PCT/JP2006/301797
Other languages
English (en)
Japanese (ja)
Inventor
Yasuo Itami
Makio Takeuchi
Kanji Akai
Teruo Kido
Hideo Ohya
Takayuki Hyoudou
Original Assignee
Daikin Industries, Ltd.
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Filing date
Publication date
Application filed by Daikin Industries, Ltd. filed Critical Daikin Industries, Ltd.
Publication of WO2006095514A1 publication Critical patent/WO2006095514A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/46—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing oxalates
    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/08—Anti-corrosive paints
    • C09D5/082—Anti-corrosive paints characterised by the anti-corrosive pigment
    • C09D5/086—Organic or non-macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • 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
    • 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
    • F28F19/06—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings of metal
    • 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
    • F28F2245/00—Coatings; Surface treatments
    • F28F2245/02—Coatings; Surface treatments hydrophilic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2245/00—Coatings; Surface treatments
    • F28F2245/04—Coatings; Surface treatments hydrophobic

Definitions

  • the present invention relates to a heat exchanger, a refrigeration cycle apparatus, and a paint used for them.
  • heat exchanger fins are subjected not only to a ground treatment for preventing corrosion of an aluminum fin base material but also to a hydrophilic treatment for preventing water droplets of condensed water generated during heat exchange. Yes.
  • a hydrophilic treatment By this hydrophilic treatment, the water droplets are prevented from being dispersed and the water droplets are prevented from scattering.
  • problems such as power loss and noise caused by narrowing the air ventilation path are eliminated.
  • the fin base material a base material of aluminum or aluminum alloy, which is excellent in lightness, workability, and thermal conductivity, is often used.
  • a chemical conversion treatment with chromate is used as a base treatment applied to the fin base.
  • Patent Document 1 A method of applying water glass is disclosed in Patent Document 1.
  • methods (i) to (V) are methods using an organic material as a main component
  • methods (vi) are methods using an inorganic material as a main component.
  • Patent Document 2 discloses a method of forming a coating film containing an organic resin and silica as main components on the surface of an aluminum fin.
  • the hydrophilicity of the fin surface is sufficiently exerted immediately after the coating film is formed, but the hydrophilicity gradually decreases due to repeated drying and wetting and adhesion of hydrocarbons.
  • Patent Document 1 JP 2002-275650 A
  • Patent Document 2 Japanese Patent Laid-Open No. 10-30069
  • the hydrophilicity of the fin surface is reduced, and there is a risk that water droplets may be scattered from the outlet of the indoor unit. Further, in this case, the corrosion resistance of the fin base material is also lowered, so that the corrosion of the fin may be accelerated.
  • the mechanism for degrading the hydrophilicity of the coating film has not been elucidated, and the actual situation is that no permanent measures have been taken to maintain the hydrophilicity of the fins.
  • An object of the present invention is to solve the problem of a heat exchanger using aluminum fins in an evaporator and a refrigeration cycle apparatus including the heat exchanger, that is, water repellency on the fin surface. is there.
  • the present inventors have found that the water repellency of the fin surface is caused by adhesion of an organic substance to the fin and two hydroxyl groups present in the hydrophilic coating film. Not only does it become ether-bonded or the hydroxyl group is converted to a carbonyl group, the hydrophilicity decreases, but also the power contained in the organic substance ⁇ or the carboxylic acid compound derived from the organic substance, the ano-remium and water.
  • the main cause is aluminum carboxylate
  • the hydrophilic coating contains a compound that reacts with aluminum in preference to the rubonic acid compound. It has been found that the formation of aluminum carboxylate is suppressed by having it.
  • the coating film Contains aluminum scavenger.
  • the aluminum scavenger is preferably at least one of a chelating agent, a polybasic acid, and a salt thereof.
  • the aluminum scavenger is, for example, one or more of a chelating agent, a polybasic acid, and a salt thereof.
  • the hydrophilic property of a coating film can be maintained for a long period of time, and the water-repellent property of a fin surface can be suppressed. Moreover, the trouble of removing the aluminum carboxylate can be reduced.
  • the reaction product of the carboxylic acid compound and aluminum ions remains in the coating film, the contribution to the water repellency of the fin surface can be kept small.
  • the rubonic acid compound is divalent, the same effect as when a large amount of aluminum scavenger is used can be obtained.
  • the amount of the divalent carboxylic acid compound already contained in the coating film is estimated to be small with respect to the coating film because the acid value of the resin used is low. In the case of the present invention, since it usually contains an amount of the order of several percent with respect to the coating film, it differs from the conventional coating film.
  • the polybasic acid is a polyvalent carboxylic acid having a molecular weight of 90 to 250. Also preferred are the forces at which the carbons in the two carboxyl groups are directly bonded, or polyvalent carboxylic acids in which:! In this case, the molecular weight (carboxynole group equivalent) per carboxynole group contained in the polybasic acid is reduced. For this reason, the number of bonding points with the aluminum ion increases, and the aluminum ion is easily trapped by the two carboxyleno groups in the polyvalent carboxylic acid. Thereby, the production
  • a chelating agent having a molecular weight of 100 to 700 is preferable to use as the chelating agent.
  • chelating agents include ethylenediamine amine acetic acid (EDTA), ditrimethyl triacetic acid (NTA), diethylenetriaminepentaacetic acid (DTPA), glutamic acid diacetic acid (GLDA), hydroxyethyl ethylenediamine amine acetic acid (HEDTA), glycol Ether diamine tetraacetic acid (GEDTA), triethylenetetramine hexaacetic acid (TTHA), hydroxyethyl iminoniacetic acid (HIDA), dihydroxyethylglycine (DHEG) or cyclohexane diamine tetraacetic acid (CyDTA) are used.
  • EDTA ethylenediamine amine acetic acid
  • NDA ditrimethyl triacetic acid
  • DTPA diethylenetriaminepentaacetic acid
  • GLDA glutamic acid diacetic
  • the content of the aluminum scavenger is preferably 0.01 to 10% by weight with respect to the coating film.
  • the aluminum scavenger is oxalic acid or maleic acid in the polyvalent carboxylic acid, the content thereof is 0.:! To 10% by weight with respect to the coating film.
  • ethylenetetramine hexaacetic acid (TTHA) or diethylenetriamine pentaacetic acid (DTP A) is used, it is preferably 0.4 to 10% by weight based on the coating film.
  • TTHA ethylenetetramine hexaacetic acid
  • DTP A diethylenetriamine pentaacetic acid
  • the coating film includes a corrosion-resistant organic coating film formed on the outer surface of the fin, and the coating film.
  • the hydrophilic coating is composed of a polyacrylic acid-based coating, a polybutyl alcohol-based coating, an epoxy-based coating, an acrylic cellulose-based coating, and an acrylic amide-based coating.
  • the organic coating film is an acrylic silicone coating film, a polymethyl methacrylate coating film, a polystyrene coating film, a polymethylstyrene coating film, a poly It is preferably composed of two or more kinds of resins forming an acetic acid-based coating film, a polyethylene-based coating film, a urethane-based coating film, or the above-mentioned coating film. In this case, the hydrophilicity of the fin surface can be maintained for a long time.
  • a second aspect of the present invention is a refrigeration cycle apparatus including the above heat exchanger, and in this case as well, the same operational effects as in the case of the above heat exchanger can be obtained.
  • a third aspect of the present invention is a hydrophilic paint applied to the surface of an aluminum fin for a heat exchanger.
  • the function as a heat exchanger fin is suitably exhibited, and the same effect as in the case of the heat exchanger can be obtained.
  • FIG. 1 is a block diagram showing a schematic configuration of a refrigeration cycle apparatus of the present embodiment.
  • FIG. 2 is a perspective view showing the overall configuration of the heat exchanger of the present embodiment.
  • FIG. 3 is a partial sectional view showing a sectional structure near the surface of the fin.
  • the refrigeration cycle apparatus 10 includes a heat exchanger 11 (evaporator), a compressor 12, a switching valve 13, an expansion valve 14, and a fan 15.
  • the surroundings are cooled via the fins of the heat exchanger 11 by evaporating the refrigerant in the heat exchanger 11.
  • the refrigeration cycle apparatus 10 is used in various refrigerators such as air conditioners, containers, and showcases.
  • the heat exchanger 11 is a cross fin coil type heat exchanger, and is configured by overlapping a plurality of fins 16.
  • a heat transfer tube 18 for circulating the refrigerant is disposed inside the heat exchanger 11.
  • the fin 16 is made of an aluminum fin base material 16a, and a coating film 20 is formed on the surface of the fin base material 16a. Is provided.
  • the fin base material 16a is made of an aluminum or aluminum alloy fin base material.
  • the surface of the fin base material 16a is provided with a corrosion-resistant organic coating film 20b as a base treatment in order to improve the corrosion resistance.
  • a corrosion-resistant organic coating film 20b instead of the organic coating film 20b, chromate may be applied as a base treatment.
  • a hydrophilic coating film 20a is formed so as to cover the surface of the organic coating film 20b.
  • the coating film 20 is composed of the organic coating film 20b and the hydrophilic coating film 20a.
  • At least one of the hydrophilic coating film 20a and the organic coating film 20b contains an aluminum scavenger.
  • hydrophilic coating film 20a for example,
  • Organic resin that is a combination of hydrophilic organic resin and colloidal silica as the main components and, if necessary, a cross-linking agent
  • Water glass coating film that is a mixture of an alkali silicate as a main component and an anionic or nonionic hydrophilic organic resin.
  • organic resin coating film (1) and organic resin 'colloidal silica coating film (2) are preferred. Is more preferable.
  • the hydrophilic organic resin used for forming the organic resin-based coating film (1) contains a hydroxyl group, a carboxynole group, an amino group, or the like in the molecule and is used as it is, or each functional group is an acid or Examples thereof include resins that can be water-soluble or water-dispersed in a state neutralized with a base.
  • hydrophilic organic resin for example, polybulu alcohol, modified polybulu alcohol
  • polybulal alcohol resin polyacrylic acid, carboxyl group-containing acrylic resin , Copolymers of ethylene and acrylic acid, acrylic resins such as ionomers, epoxy resins such as adducts of epoxy resins and amines, acrylamide resins, polyethylene glycol, carboxylate group-containing polyesters
  • Synthetic hydrophilic resins such as stealth resins; natural polysaccharides such as starch, cellulose, and algin; oxidized starch, dextrin, propylene glycol alginate, carboxymethyl starch, carboxymethyl cellulose, hydroxymethyl starch, hydroxymethyl cellulose, hydroxyethyl cellulose And derivatives of natural polysaccharides such as acrylic cellulose resins.
  • acrylic resin, polybulal alcohol resin polyacrylic acid, carboxyl group-containing acrylic resin , Copolymers of ethylene and acrylic acid, acrylic resins such as ionomers, epoxy resins such as adducts of epoxy resins and amines, acrylamide
  • Examples of the crosslinking agent used for forming the organic resin coating film (1) include melamine resin, urea resin, phenol resin, polyepoxy compound, blocked polyisocyanate compound, metal chelate. There are compounds.
  • the cross-linking agent preferably has water solubility or water dispersibility from the viewpoint of uniformly dispersing an aluminum capturing material or the like in the coating film 20.
  • cross-linking agent examples include, for example, methyl etherified melamine resin, butyl etherified melamine resin, methylbutyl mixed etherified melamine resin, methyl etherified urea resin, methyl etherified benzoguanamine resin, polyphenols, and aliphatic poly Divalent or polyglycidyl ether of valent alcohol, amine-modified epoxy resin, blocked product of triisocyanurate of hexamethylene diisocyanate; metal of metal element such as titanium (Ti), zirconium (Zr), aluminum (A1) There are chelate compounds. As the metal chelate compound, one having two or more metal alkoxide bonds in one molecule is preferable.
  • Organic resin As the hydrophilic organic resin used for forming the colloidal silica-based coating film (2), the same hydrophilic organic resin used for forming the organic resin-based coating film (1) is used.
  • the colloidal silica used to form the organic resin 'colloidal silica-based coating film (2) is les, so-called silica sol or finely divided silica.
  • the particle diameter of colloidal silica is usually 5 nm to 10 ⁇ m, preferably 5 nm to 1 ⁇ m.
  • colloidal silica what is supplied as a water dispersion can be used as it is, or a fine powdered silica dispersed in water can be used.
  • the organic resin 'colloidal silica-based coating film (2) is formed by reacting an organic resin and colloidal silica in the presence of alkoxysilane, which may be formed by simply mixing the organic resin and colloidal silica. Also good.
  • anionic or nonionic hydrophilic organic resin used for forming the water glass-based coating film (3) among the hydrophilic organic resins used for forming the organic resin-based coating film (1), anionic Alternatively, nonionic organic resins are used.
  • Examples of the organic coating film 20b include an acrylic silicone coating film, a polymethyl methacrylate coating film, a polystyrene coating film, a polymethylstyrene coating film, a polyvinyl acetate coating film, a polyethylene coating film, and a urethane. And a coating film obtained by combining two or more resins forming these coating films.
  • an aluminum scavenger for example, among chelating agents, polybasic acids, and salts thereof
  • a chelating agent having a molecular weight of 100 to 700 is preferable.
  • diethylenetriaminepentaacetic acid (DTPA) and triethylenetetraminehexaacetic acid (TTHA) are preferred because they can easily capture and sequester aluminum ions and have high stability.
  • polybasic acid for example, a polyvalent carboxylic acid having a molecular weight of 90 to 250 is used.
  • the polyvalent carboxylic acid As the polyvalent carboxylic acid, it reacts with aluminum ions to form a salt and captures the aluminum ion, so the carbons of the two carboxyl groups contained in the polyvalent carboxylic acid are directly bonded.
  • multivalent carboxylic acids which are bonded with 10 to 10 atoms apart are preferred.
  • polyvalent carboxylic acid examples include oxalic acid, malonic acid, fumaric acid, maleic acid, adipic acid, sebacic acid, azelaic acid, dodecanoic acid, phthalic acid, trimellitic acid, and glutamic acid. Of these, oxalic acid and maleic acid are preferred.
  • the content of the aluminum scavenger is, for example, that of the polybasic acid oxalic acid or maleic acid. In other words, the content is 0.1% by weight or more, preferably 0.2% by weight or more, based on the coating film 20. In this way, the reaction between the aluminum scavenger and the aluminum ions can be promoted, and the hydrophilicity of the surface of the fin 16 can be maintained for a long time.
  • the content of the aluminum scavenger is 10% by weight or less with respect to the coating film 20, and preferably 3% by weight or less.
  • the hydrophilicity of the surface of the fin 16 can be maintained for a long time, and the coating film 20 that does not impair the original hydrophilicity of the coating film 20 can be easily formed.
  • the aluminum scavenger can be uniformly dispersed in the coating film 20.
  • a chelating agent is used as an aluminum scavenger.
  • TTHA triethylenetetramine hexaacetic acid
  • DTPA diethylenetriaminepentaacetic acid
  • the content thereof is 0.4% by weight or more with respect to the coating film 20. It is preferably at least 10% by weight, more preferably at most 10% by weight, and preferably at most 8% by weight.
  • the hydrophilicity of the surface of the fin 16 can be maintained for a long period of time, and the coating film 20 that easily impairs the original hydrophilicity of the coating film 20 can be easily formed. Further, the aluminum scavenger can be uniformly dispersed in the coating film 20.
  • the amount of the polyvalent carboxylic acid as a coating film forming raw material that may remain in the coating film 20 is very small.
  • the paint used for forming the coating film 20 is defined as the paint of the present invention.
  • the proportions of various components contained in the paint are the same as in the case of the coating film 20 described above. That is, the difference between the state of the coating film 20 formed on the surface of the fin 16 or the state of the paint before the coating film 20 is formed.
  • the fin 16 is formed by applying the organic coating film 20b to the surface of the fin base 16a and providing the hydrophilic coating film 20a so as to cover the surface.
  • the fin base 16a a conventionally known aluminum fin base is used.
  • the organic coating film 20b is formed by applying a paint to the surface of the fin base material 16a and drying the paint.
  • a coating method such as immersion coating, shower coating, spray coating, roll coating, and electrodeposition coating is used.
  • the paint is applied to the state force assembled in the heat exchanger 11 or to the fin base material 16a before being assembled.
  • the fin base material 16a is dried. At that time The drying temperature is set to about 60-250 ° C, and the drying time is set to 2 seconds to 30 minutes.
  • the thickness of the organic coating film 20b is usually from 0.001 to 10 / im, and preferably from 0.1 to 3 ⁇ . If the thickness is less than 0.001 / im, the corrosion resistance and water resistance of the fin base material 16a may not be sufficiently obtained. On the other hand, if the thickness exceeds 10 ⁇ m, the organic coating film 20b is likely to break, and there is a possibility that sufficient hydrophilicity may not be obtained. An aluminum scavenger may be added to the organic coating film 20b.
  • a hydrophilic coating 20a is formed by applying a hydrophilic coating to the surface of the fin base material 16a on which the organic coating 20b is formed and drying the coating.
  • a method for forming the hydrophilic coating film 20a for example, a coating method such as dip coating, shower coating, spray coating, roll coating, or electrodeposition coating is used.
  • the thickness of the hydrophilic coating film 20a is usually from 0.3 to 5 zm, and preferably from 0.5 to 3 zm, but is not particularly limited to these set values.
  • the drying conditions of the hydrophilic coating film 20a are set according to the type of organic resin and the film thickness thereof, but preferably the drying temperature is set to about 80 to 250 ° C and the drying time is about It is set between 5 seconds and about 30 minutes.
  • An aluminum scavenger may be added to the hydrophilic coating film 20a.
  • the coating film 20 contains an aluminum scavenger.
  • an aluminum scavenger As a result, even if the organic substance comes into contact with the fins 16, the aluminum ions eluted from the fins 16 are captured by the aluminum scavenger. Therefore, the reaction between the carboxylic acid compound derived from the organic substance and the aluminum ion can be avoided, and the ability to suppress the formation of aluminum carboxylate as the reaction product can be suppressed.
  • the content and type of the aluminum scavenger it is possible to more effectively suppress the formation of strong aluminum sulfonate.
  • the material for forming the coating film 20 the water repellency of the surface of the fin 16 can be further effectively suppressed.
  • the same effect can be obtained even if the fin 16 is used in the heat exchanger 11 that uses the evaporator.
  • the same effect can be obtained in the refrigeration cycle apparatus 10 including the heat exchanger 11. Further, when the fins 16 are formed using the coating material and the heat exchanger 11 is manufactured using the fins 16, the same effects can be obtained.
  • the present invention since water repellency on the surface of the fin 16 is suppressed, it is possible to prevent scattering of water droplets formed on the surface of the fin 16 and between the fins 16, and the air conditioning system. Blow The performance can also be improved.
  • the present invention is particularly applicable to uses such as heat exchangers, air conditioners, and refrigerators for indoor air conditioners.
  • the paint described in Table 1 was applied to the surface of the chromate-treated aluminum fin substrate so that the film thickness after drying was 0.5 ⁇ m.
  • the paint was dried at 200-220 ° C for 30 seconds to produce two types of coated products. Fins were formed from these paints, and heat exchangers were made using them. At that time, half of the fin bundles constituting the heat exchanger were fins coated with the paint of Example 1, and the other half were fins coated with the paint of Conventional Example 1. Then, this heat exchanger is built into a multi-flow cassette type air conditioner, and the air conditioner is installed on the ceiling of the office.
  • Example 2 a heat exchanger was produced under the same conditions as in Example 1 except that the paint of Example 2 was used, and the above evaluation test was performed. In that case, the same result as in Example 1 was obtained.
  • Example 1 Example 2 Conventional Example 1 Hydrophilic paint (* 1) 1 0 0 1 0 0 1 0 0 Paint composition Triethylenetetraminehexanoic acid 1--(parts by weight, solid content)

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

L’invention concerne un échangeur thermique qui utilise, dans l’évaporateur de celui-ci, une ailette constituée d’aluminium ayant un film de revêtement formé sur la surface de celle-ci, où le film de revêtement comprend agent de capture d’aluminium. L'échangeur thermique est fabriqué en utilisant l'ailette précédente et un appareil à cycle de réfrigération équipé de l'échangeur thermique précédent est fabriqué.
PCT/JP2006/301797 2005-02-04 2006-02-02 Echangeur thermique, appareil a cycle de refrigeration, et revetement destine a etre utilise dans ceux-ci WO2006095514A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-029437 2005-02-04
JP2005029437A JP2006213978A (ja) 2005-02-04 2005-02-04 熱交換器、冷凍サイクル装置及びそれに使用する塗料

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WO2006095514A1 true WO2006095514A1 (fr) 2006-09-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010096416A (ja) * 2008-10-16 2010-04-30 Furukawa-Sky Aluminum Corp 熱交換器用プレコートアルミニウムフィン材
WO2010110332A1 (fr) * 2009-03-24 2010-09-30 株式会社神戸製鋼所 Matériau d'ailette en aluminium pour échangeur de chaleur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011096231A1 (fr) * 2010-02-05 2011-08-11 日鉄ハード株式会社 Matière de pulvérisation thermique et procédé pour former un revêtement pulvérisé
JP5894799B2 (ja) * 2010-02-05 2016-03-30 日鉄住金ハード株式会社 溶射材料および溶射皮膜の形成方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62209185A (ja) * 1986-03-11 1987-09-14 Nippon Foil Mfg Co Ltd 熱交換器用フイン材
JP2000282267A (ja) * 1999-03-29 2000-10-10 Nippon Paint Co Ltd アルミニウム合金の防錆・親水化処理剤およびこれを用いた防錆・親水化処理方法
JP2002146549A (ja) * 2000-11-14 2002-05-22 Kobe Steel Ltd アルミニウム製フィン材の製造方法およびこの方法により製造されたアルミニウム製フィン材
JP2004293916A (ja) * 2003-03-27 2004-10-21 Furukawa Sky Kk 熱交換器フィン用アルミニウム塗装材の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62209185A (ja) * 1986-03-11 1987-09-14 Nippon Foil Mfg Co Ltd 熱交換器用フイン材
JP2000282267A (ja) * 1999-03-29 2000-10-10 Nippon Paint Co Ltd アルミニウム合金の防錆・親水化処理剤およびこれを用いた防錆・親水化処理方法
JP2002146549A (ja) * 2000-11-14 2002-05-22 Kobe Steel Ltd アルミニウム製フィン材の製造方法およびこの方法により製造されたアルミニウム製フィン材
JP2004293916A (ja) * 2003-03-27 2004-10-21 Furukawa Sky Kk 熱交換器フィン用アルミニウム塗装材の製造方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010096416A (ja) * 2008-10-16 2010-04-30 Furukawa-Sky Aluminum Corp 熱交換器用プレコートアルミニウムフィン材
WO2010110332A1 (fr) * 2009-03-24 2010-09-30 株式会社神戸製鋼所 Matériau d'ailette en aluminium pour échangeur de chaleur
EP2413085A1 (fr) * 2009-03-24 2012-02-01 Kabushiki Kaisha Kobe Seiko Sho Matériau d'ailette en aluminium pour échangeur de chaleur
CN102348954A (zh) * 2009-03-24 2012-02-08 株式会社神户制钢所 热交换器用铝翅片材
EP2413085A4 (fr) * 2009-03-24 2014-09-10 Kobe Steel Ltd Matériau d'ailette en aluminium pour échangeur de chaleur

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