CN116113669B - Precoated fin sheet - Google Patents
Precoated fin sheet Download PDFInfo
- Publication number
- CN116113669B CN116113669B CN202180056562.6A CN202180056562A CN116113669B CN 116113669 B CN116113669 B CN 116113669B CN 202180056562 A CN202180056562 A CN 202180056562A CN 116113669 B CN116113669 B CN 116113669B
- Authority
- CN
- China
- Prior art keywords
- coating film
- resin coating
- fin sheet
- resin
- precoated fin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011248 coating agent Substances 0.000 claims abstract description 118
- 238000000576 coating method Methods 0.000 claims abstract description 118
- 229920005989 resin Polymers 0.000 claims abstract description 95
- 239000011347 resin Substances 0.000 claims abstract description 95
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 55
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 55
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 47
- 239000000758 substrate Substances 0.000 claims abstract description 46
- 125000000962 organic group Chemical group 0.000 claims abstract description 12
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 5
- 238000005260 corrosion Methods 0.000 claims description 21
- 230000007797 corrosion Effects 0.000 claims description 21
- 229920001223 polyethylene glycol Polymers 0.000 claims description 21
- 239000002202 Polyethylene glycol Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 20
- 239000003242 anti bacterial agent Substances 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 9
- 239000004925 Acrylic resin Substances 0.000 claims description 7
- 229920000178 Acrylic resin Polymers 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 5
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 claims description 5
- 125000005010 perfluoroalkyl group Chemical group 0.000 claims description 5
- 229920000647 polyepoxide Polymers 0.000 claims description 5
- 229920005749 polyurethane resin Polymers 0.000 claims description 5
- -1 isocyanate compounds Chemical class 0.000 claims description 4
- 229920000877 Melamine resin Polymers 0.000 claims description 2
- 239000003112 inhibitor Substances 0.000 claims description 2
- 239000012948 isocyanate Substances 0.000 claims description 2
- 230000003449 preventive effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 230000000844 anti-bacterial effect Effects 0.000 description 20
- 239000000356 contaminant Substances 0.000 description 18
- 239000000126 substance Substances 0.000 description 17
- 239000003429 antifungal agent Substances 0.000 description 16
- 229940121375 antifungal agent Drugs 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 13
- 230000015556 catabolic process Effects 0.000 description 11
- 238000006731 degradation reaction Methods 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 7
- 239000002253 acid Substances 0.000 description 7
- 229920001577 copolymer Polymers 0.000 description 7
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 6
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 5
- 229920001519 homopolymer Polymers 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000002390 adhesive tape Substances 0.000 description 3
- 239000003431 cross linking reagent Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 125000001749 primary amide group Chemical group 0.000 description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N 1,4a-dimethyl-7-propan-2-yl-2,3,4,4b,5,6,10,10a-octahydrophenanthrene-1-carboxylic acid Chemical compound C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000000843 anti-fungal effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229920000840 ethylene tetrafluoroethylene copolymer Polymers 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920002620 polyvinyl fluoride Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 150000003334 secondary amides Chemical class 0.000 description 2
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 description 1
- HNNQYHFROJDYHQ-UHFFFAOYSA-N 3-(4-ethylcyclohexyl)propanoic acid 3-(3-ethylcyclopentyl)propanoic acid Chemical compound CCC1CCC(CCC(O)=O)C1.CCC1CCC(CCC(O)=O)CC1 HNNQYHFROJDYHQ-UHFFFAOYSA-N 0.000 description 1
- GUUULVAMQJLDSY-UHFFFAOYSA-N 4,5-dihydro-1,2-thiazole Chemical compound C1CC=NS1 GUUULVAMQJLDSY-UHFFFAOYSA-N 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- FZWLAAWBMGSTSO-UHFFFAOYSA-N Thiazole Chemical compound C1=CSC=N1 FZWLAAWBMGSTSO-UHFFFAOYSA-N 0.000 description 1
- QDAYJHVWIRGGJM-UHFFFAOYSA-B [Mo+4].[Mo+4].[Mo+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O Chemical compound [Mo+4].[Mo+4].[Mo+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QDAYJHVWIRGGJM-UHFFFAOYSA-B 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000001845 chromium compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- NMCCNOZOBBWFMN-UHFFFAOYSA-N davicil Chemical compound CS(=O)(=O)C1=C(Cl)C(Cl)=NC(Cl)=C1Cl NMCCNOZOBBWFMN-UHFFFAOYSA-N 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007561 laser diffraction method Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- XKJCHHZQLQNZHY-UHFFFAOYSA-N phthalimide Chemical compound C1=CC=C2C(=O)NC(=O)C2=C1 XKJCHHZQLQNZHY-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000223 polyglycerol Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000000790 scattering method Methods 0.000 description 1
- 125000003156 secondary amide group Chemical group 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229940124530 sulfonamide Drugs 0.000 description 1
- 150000003456 sulfonamides Chemical class 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- WJCNZQLZVWNLKY-UHFFFAOYSA-N thiabendazole Chemical compound S1C=NC(C=2NC3=CC=CC=C3N=2)=C1 WJCNZQLZVWNLKY-UHFFFAOYSA-N 0.000 description 1
- JUWGUJSXVOBPHP-UHFFFAOYSA-B titanium(4+);tetraphosphate Chemical compound [Ti+4].[Ti+4].[Ti+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O JUWGUJSXVOBPHP-UHFFFAOYSA-B 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
- 229940043810 zinc pyrithione Drugs 0.000 description 1
- PICXIOQBANWBIZ-UHFFFAOYSA-N zinc;1-oxidopyridine-2-thione Chemical compound [Zn+2].[O-]N1C=CC=CC1=S.[O-]N1C=CC=CC1=S PICXIOQBANWBIZ-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
- 229910000166 zirconium phosphate Inorganic materials 0.000 description 1
- LEHFSLREWWMLPU-UHFFFAOYSA-B zirconium(4+);tetraphosphate Chemical compound [Zr+4].[Zr+4].[Zr+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LEHFSLREWWMLPU-UHFFFAOYSA-B 0.000 description 1
Classifications
-
- 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
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- 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
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/24—Homopolymers or copolymers of amides or imides
- C09D133/26—Homopolymers or copolymers of acrylamide or methacrylamide
-
- 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
-
- 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
- C09D5/16—Antifouling paints; Underwater paints
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Geometry (AREA)
- Paints Or Removers (AREA)
- Laminated Bodies (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The pre-coated fin material (1) has a substrate (2) and a resin coating film (3) formed on the substrate (2). The resin coating film (3) contains a modified polyvinyl alcohol (A) having a molecular structure represented by the following general formula (1) and an acrylamide polymer (B). The content of the modified polyvinyl alcohol (A) is 0.5 to 2.0 times the content of the acrylamide polymer (B) in terms of mass ratio. Wherein R 1 in the general formula (1) is an organic group having a linear structure and having 5 to 10 carbon atoms, and m and n are positive integers satisfying the relationship of 0.005.ltoreq.n/m.ltoreq.0.025.
Description
Technical Field
The present invention relates to precoated fin sheets.
Background
As a heat exchanger to be mounted in an air conditioner, a refrigerator, or the like, a so-called cross-fin tube heat exchanger is often used, which has a plurality of fins and tubes crossing the fins. The fin is produced by press working a precoated fin sheet having a substrate made of aluminum (including pure aluminum and aluminum alloy, the same applies hereinafter) and a resin coating film provided on the substrate.
If the surface temperature of the fins is lower than the dew point of air during operation of the air conditioner or the like, condensation occurs on the surfaces of the fins, and gaps between the fins may be blocked by condensed water. If the gaps between the fins are blocked, there is a possibility that the heat exchange efficiency of the heat exchanger may be lowered.
For this problem, a technique is known in which the surface hydrophilicity of the fins is improved to suppress clogging of gaps between the fins due to dew condensation water. For example, patent document 1 describes a hydrophilization treatment composition for heat exchanger fin sheets, which comprises (a) at least 1 polymer selected from polyglycerol and polyvinyl alcohol, (B) a high acid value acrylic resin having a resin acid value of 300mgKOH/g or more, and (C) a water-soluble resin other than the polymer (a) and the high acid value acrylic resin (B), and is characterized in that the resin solid component of the hydrophilization treatment composition has a resin acid value of 200mgKOH/g or more and a hydroxyl value of 100mgKOH/g or more.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2002-38134
Disclosure of Invention
Problems to be solved by the invention
However, if dew condensation water adheres to the surfaces of the fins during use of the heat exchanger, hydrophilic substances in the resin coating film are washed away by the dew condensation water, and therefore the hydrophilicity of the fin surfaces gradually decreases. Further, oily contaminants present in the environment such as higher fatty acids and higher alcohols accompanying the use of the heat exchanger are attached to the surfaces of the fins. These contaminants may cause a decrease in hydrophilicity of the fin surface.
As described above, the conventional fin has the following problems: the decrease in hydrophilic substances caused by dew condensation water gradually reduces the hydrophilicity in use of the heat exchanger due to the adhesion of oily contaminants.
The present invention has been made in view of such a background, and an object thereof is to provide a precoated fin sheet which can maintain excellent hydrophilicity for a long period of time and can easily remove oily contaminants adhering to the surface.
Means for solving the problems
One embodiment of the present invention is a precoated fin sheet comprising a substrate containing aluminum and a resin coating film formed on the substrate and exposed on the surface, wherein the resin coating film contains a modified polyvinyl alcohol (a) having a molecular structure represented by the following general formula (1) and an acrylamide polymer (B), and the content of the modified polyvinyl alcohol (a) is 0.5 to 2.0 times as high as the content of the acrylamide polymer (B) in terms of a mass ratio.
[ Chemical 1]
Wherein R 1 in the general formula (1) is an organic group having a linear structure and having 5 to 10 carbon atoms, and m and n are positive integers satisfying a relationship of 0.005.ltoreq.n/m.ltoreq.0.025.
Effects of the invention
The surface of the precoated fin sheet is provided with a resin coating film containing the specific modified polyvinyl alcohol (a) and the acrylamide polymer (B). In the resin coating film, the specific modified polyvinyl alcohol (a) is used, and the mass ratio of the modified polyvinyl alcohol (a) to the acrylamide polymer (B) is in the specific range, whereby the hydrophilicity of the surface of the precoated fin sheet can be improved, and excellent hydrophilicity can be maintained for a long period of time.
Further, the surface of the precoated fin sheet is excellent not only in hydrophilicity but also in oil repellency, and thus adhesion of oily contaminants to the surface of the precoated fin sheet can be suppressed. Further, since the precoated fin sheet is excellent in both hydrophilicity and oil repellency, dew water and the like easily enter between the surface of the precoated fin sheet and the contaminant adhering to the surface. Therefore, even when an oily contaminant adheres to the surface of the precoated fin sheet, the contaminant can be rinsed with moisture such as dew condensation water, and can be easily removed from the surface of the fin.
As described above, the precoated fin sheet can maintain excellent hydrophilicity for a long period of time, and can easily remove oily contaminants adhering to the surface.
Drawings
Fig. 1 is an enlarged partial cross-sectional view showing the main parts of test materials 1 to 3 in the example.
Fig. 2 is a partially enlarged sectional view showing the main portions of the test material 4 and the test material 5 in the example.
Detailed Description
In the precoated fin sheet, aluminum constituting the substrate can be appropriately selected from pure aluminum and aluminum alloys according to desired mechanical properties, corrosion resistance, and the like. The substrate may be made of pure aluminum, for example, and has a chemical composition indicated by an alloy number of 1200, 1050, or the like in JIS H4000.
A resin coating film containing a modified polyvinyl alcohol (a) and an acrylamide polymer (B) is formed on a substrate. The resin coating film may be directly laminated on the substrate, or another coating film or coating film may be present between the substrate and the resin coating film.
For example, the pre-coated fin sheet may further have a base coating film laminated on the substrate. The base coating film can exhibit an effect of improving adhesion between the substrate and the corrosion-resistant coating film, improving corrosion resistance of the substrate, and the like, depending on the material of the base coating film.
As the base film, for example, a film obtained by a chemical conversion treatment can be used. Examples of the chemical conversion treatment include chromate treatment using a chromate phosphate or the like, and non-chromate treatment using titanium phosphate, zirconium phosphate, molybdenum phosphate, zinc phosphate, zirconium oxide or the like other than a chromium compound.
The chemical conversion treatment includes a reactive chemical conversion treatment and a coating chemical conversion treatment, and the chemical conversion treatment may be performed by any method. The amount of the substrate film to be adhered can be appropriately selected from the range of 100mg/m 2 or less in terms of the metal content, for example. The amount of the substrate film attached can be measured by a fluorescent X-ray analyzer.
In addition, the precoated fin sheet may further have a corrosion-resistant coating film interposed between the substrate and the resin coating film. The corrosion-resistant coating film may contain, for example, 1 or 2 or more resins selected from the group consisting of acrylic resins, epoxy resins, polyurethane resins, and ester resins. The corrosion-resistant coating film containing these resins can further improve the corrosion resistance of the fin.
The film thickness of the corrosion-resistant coating film can be appropriately set in a range of, for example, 0.3 μm or more and 5.0 μm or less. By setting the film thickness of the corrosion-resistant coating film from the specific range, the effect of improving the corrosion resistance of the fin can be sufficiently obtained while avoiding a decrease in heat radiation performance due to the corrosion-resistant coating film.
The resin coating film provided on the surface of the precoated fin sheet contains a modified polyvinyl alcohol (a) and an acrylamide polymer (B). The resin coating film may have a hydrophilic layer containing the modified polyvinyl alcohol (a) and the acrylamide-based polymer (B). By forming such a hydrophilic layer in the resin coating film, the hydrophilicity and oil repellency of the surface of the precoated fin sheet can be improved, and these properties can be maintained for a long period of time.
The film thickness of the resin coating film can be appropriately set in a range of, for example, 0.3 μm or more and 2.0 μm or less. By setting the film thickness of the resin coating film to 0.3 μm or more, the hydrophilicity of the surface of the precoated fin material can be improved, and contaminants adhering to the surface of the fin can be removed more easily from the surface of the fin. In addition, by setting the film thickness of the resin coating film to 2.0 μm or less, the coatability of the coating material at the time of forming the resin coating film can be improved.
The modified polyvinyl alcohol (a) in the resin coating film has a molecular structure in which a part of hydroxyl groups in the polyvinyl alcohol are modified with an organic group having a hydroxyl group at the end. Specifically, the modified polyvinyl alcohol (a) has a molecular structure represented by the following general formula (1).
[ Chemical 2]
Wherein R 1 in the general formula (1) is an organic group having a linear structure and having 5 to 10 carbon atoms, and m and n are positive integers satisfying a relationship of 0.005.ltoreq.n/m.ltoreq.0.025.
The modified polyvinyl alcohol (a) modified by the specific organic group is less likely to crystallize than unmodified polyvinyl alcohol because a bulky organic group is introduced into a side chain. Therefore, by blending the modified polyvinyl alcohol (a) in the resin coating film, the formation of hydrogen bonds can be suppressed, and the hydrophilicity and oil repellency of the surface of the precoated fin sheet can be maintained for a long period of time.
From the viewpoint of further improving the above-described effect, R 1 in the general formula (1) is preferably an organic group containing a plurality of methylene groups and 1 or more carbonyl groups, and more preferably an organic group containing a plurality of methylene groups and 2 or more carbonyl groups.
In the case where R 1 in the general formula (1) is an organic group containing a carbonyl group, the position of the carbonyl group may be variously employed. For example, the carbonyl group may form an ester bond (-O-CO-) together with an oxygen atom bonded to the main chain of the polyvinyl alcohol. Furthermore, the carbonyl groups may be intermediate between the methylene groups (-CH 2-CO-CH2 -). Furthermore, the carbonyl group may constitute a carboxyl group (-CO-OH) together with the hydroxyl group at the end of the side chain.
The content of the modified polyvinyl alcohol (A) in the resin coating film is 0.5 to 2.0 times the mass ratio of the acrylamide polymer (B). By setting the ratio of the modified polyvinyl alcohol (a) to the acrylamide polymer (B) to the above specific range, the hydrophilicity and oil repellency of the surface of the precoated fin sheet can be maintained for a long period of time. If the ratio of the modified polyvinyl alcohol (a) to the acrylamide polymer (B) is not within the specific range, the resin coating film may deteriorate earlier in use of the heat exchanger, and there is a possibility that the hydrophilicity and the oil repellency may be lowered.
From the viewpoint of maintaining excellent hydrophilicity and oil repellency for a longer period of time, the content of the modified polyvinyl alcohol (a) is preferably 0.7 times or more and 1.9 times or less, more preferably 1.0 times or more and 1.6 times or less, of the acrylamide polymer (B).
As the acrylamide polymer (B) in the resin coating film, for example, a homopolymer of (meth) acrylamide or a derivative thereof, such as polyacrylamide or polymethacrylamide, a copolymer of 2 or more compounds selected from the group consisting of (meth) acrylamide and a derivative thereof, a copolymer of 1 or more compounds selected from the group consisting of (meth) acrylamide and a derivative thereof, and other compounds as monomers can be used. The resin coating film may contain 1 or 2 or more of these homopolymers and copolymers as the acrylamide polymer (B).
As the acrylamide polymer (B), a homopolymer of a primary or secondary amide, or a copolymer of an amide containing at least one of a primary and secondary amide as a monomer is preferably used. These homopolymers and copolymers contain primary or secondary amide groups having a high polarity. Therefore, by using these homopolymers and copolymers as the acrylamide polymer (B), the hydrophilicity of the resin coating film can be further improved, and the contaminant can be more easily removed from the fin surface. From this viewpoint, it is particularly preferable to use polyacrylamide as the acrylamide polymer (B).
The acid value of the acrylamide polymer (B) is preferably 20mgKOH/g or more and 100mgKOH/g or less. By using the acrylamide-based polymer (B) having an acid value in the specific range, excellent hydrophilicity and oil repellency can be maintained for a long period of time. As a result, the contaminant adhering to the fin surface can be easily removed from the fin surface, and the ability to remove the contaminant can be maintained for a longer period of time.
From the viewpoint of maintaining the capability of removing the contaminant for a longer period of time, it is more preferable to set the acid value of the acrylamide polymer (B) to 40mgKOH/g or more. On the other hand, from the viewpoint of further improving the ability to remove contaminants, it is more preferable to set the acid value of the acrylamide polymer (B) to 90mgKOH/g or less.
The resin coating film may contain, in addition to the modified polyvinyl alcohol (a) and the acrylamide polymer (B) as essential components, any component other than these components. When the resin coating film contains any component, the total content of the modified polyvinyl alcohol (a) and the acrylamide polymer (B) can be appropriately set in a range of 85 parts by mass or more, for example, when the mass of the entire resin coating film is 100 parts by mass. In this case, the amounts of the modified polyvinyl alcohol (a) and the acrylamide polymer (B) in the resin coating film can be sufficiently increased. As a result, the effect of an arbitrary component can be obtained while ensuring excellent hydrophilicity and oil repellency.
The resin coating film may contain polyethylene glycol as an optional component.
The polyethylene glycol may float up to the hydrophilic layer during formation of the resin coating film to form a lubricating layer. The polyethylene glycol exposed on the surface of the resin coating film functions as a lubricant for reducing friction between the precoated fin sheet and the press die when the precoated fin sheet is press-worked, and can improve workability during press working.
The polyethylene glycol content in the resin coating film is preferably 1.5 parts by mass or more and 8 parts by mass or less relative to 100 parts by mass of the resin coating film. By setting the polyethylene glycol content to 1.5 parts by mass or more, friction between the precoated fin sheet and the die during press working can be further reduced. From the viewpoint of further reducing friction between the precoated fin sheet and the die during press working, the polyethylene glycol content is preferably 2.0 parts by mass or more, more preferably 2.5 parts by mass or more.
Further, by setting the content of polyethylene glycol to 8 parts by mass or less, the surface roughness of the precoated fin material can be further reduced, and the adhesion of the contaminant to the surface of the fin can be made more difficult. The polyethylene glycol content is preferably 7 parts by mass or less, more preferably 5 parts by mass or less, from the viewpoint of making the surface of the precoated fin material smoother and more effectively suppressing the adhesion of contaminants to the fin surface.
The number average molecular weight of polyethylene glycol is preferably in the range of 1000 to 20000. In this case, the lubricity during press working can be improved, and the adhesion of contaminants to the fin surface can be more effectively suppressed.
The resin coating film may contain, as an optional component, a crosslinking agent for densification of the crystal structure of the modified polyvinyl alcohol (a). By adding the crosslinking agent to the resin coating film, the hardness of the resin coating film can be further improved, and dust adhesion can be more effectively suppressed. As the crosslinking agent, for example, melamine resin, blocked isocyanate compound, or the like can be used. These compounds may be used alone or in combination of 2 or more.
The resin coating film may further contain at least one of an antibacterial agent and a mold inhibitor, or may contain both of them as an optional component. In addition, an antibacterial/antifungal agent having both antibacterial and antifungal effects may be added to the resin coating film. By adding a compound having at least one of an antibacterial effect and a mold-proof effect to the resin coating film, corrosion of the resin coating film can be suppressed, and the effect produced by the resin coating film can be maintained for a longer period of time.
Examples of the compounds having antibacterial and antifungal activity include organic antibacterial/antifungal agents such as isothiazoline-based antibacterial/antifungal agents, aldehyde-based antibacterial/antifungal agents, benzimidazole-based antibacterial/antifungal agents, halogen-based antibacterial/antifungal agents, carboxylic acid-based antibacterial/antifungal agents, sulfonamide-based antibacterial/antifungal agents, thiazole-based antibacterial/antifungal agents, triazole-based antibacterial/antifungal agents, phenol-based antibacterial/antifungal agents, phthalimide-based antibacterial/antifungal agents, naphthenic acid-based antibacterial/antifungal agents, pyridine-based antibacterial/antifungal agents, and the like; ag. Inorganic antibacterial/antifungal agents such as Cu and Zn.
As the antibacterial/antimycotic agent, at least 1 of zinc pyrithione, 2,3,5, 6-tetrachloro-4- (methylsulfonyl) -pyridine and 2- (4-thiazolyl) benzimidazole is preferably used. These compounds have little influence on the physical properties of the resin coating film, are insoluble in water, and have high thermal stability. Therefore, by adding these compounds to the resin coating film, the antibacterial effect and the mildew-proof effect can be maintained for a long period of time.
The resin coating film may contain, as an optional component, fluororesin particles containing a perfluoroalkyl group and having a median particle diameter of 1 μm or more and 4 μm or less on a volume basis. At least a part of the fluororesin particles in the resin coating film is disposed on the surface of the hydrophilic layer, and functions as a lubricant during press working together with polyethylene glycol. By setting the median diameter of the fluororesin particles to the specific range, the lubricity during press working can be further reduced. From the viewpoint of more reliably exerting the above-described action and effect, the content of the fluororesin particles is preferably 2 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the resin coating film.
The median particle diameter of the fluororesin particles on a volume basis is specifically a cumulative 50% particle diameter in a particle diameter distribution obtained by a laser diffraction/scattering method.
As the fluororesin constituting the fluororesin particles, for example, a completely fluorinated resin such as polytetrafluoroethylene (i.e., PTFE), a partially fluorinated resin such as polyvinylidene fluoride (i.e., PVDF), polyvinyl fluoride (i.e., PVF), a fluorinated resin copolymer such as tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (i.e., PFA), ethylene-tetrafluoroethylene copolymer (i.e., ETFE), and the like can be used. The fluororesin particles may be composed of 1 kind of particles containing these fluororesin, or 2 or more kinds of particles may be used together.
The fluororesin particles are preferably composed of a fluororesin having a perfluoroalkyl group. In this case, the lubricity during press working can be further improved.
As a method for producing the precoated fin sheet, for example, the following method can be used: after a coating material containing a modified polyvinyl alcohol (A) and an acrylamide polymer (B) is applied to a substrate, the coating material is heated and dried. In the process of drying the coating material, the modified polyvinyl alcohol (a) and the acrylamide polymer (B) settle on the substrate side to form a hydrophilic layer. In this case, since the modified polyvinyl alcohol (a) has low compatibility with the acrylamide polymer (B), the phase containing the modified polyvinyl alcohol (a) and the phase containing the acrylamide polymer (B) are formed in a state of being separated from each other in the hydrophilic layer. On the surface of the hydrophilic layer, the phases of the two are exposed.
The phase containing the modified polyvinyl alcohol (a) may exhibit excellent oil repellency derived from the modified polyvinyl alcohol (a). Further, in the phase containing the modified polyvinyl alcohol (a), formation of hydrogen bonds between hydroxyl groups contained in the modified polyvinyl alcohol (a) is suppressed by steric hindrance of an organic group into which a side chain is introduced. Therefore, many hydroxyl groups that do not form hydrogen bonds on the surface of the phase containing the modified polyvinyl alcohol (a) can be exposed, and the hydrophilicity of the surface of the hydrophilic layer can be improved.
In addition, the phase containing the acrylamide-based polymer (B) may exhibit excellent hydrophilicity derived from the acrylamide-based polymer (B). Therefore, the hydrophilic layer containing the modified polyvinyl alcohol (a) and the acrylamide polymer (B) can have both excellent hydrophilicity and oil repellency.
The precoated fin sheet is used for manufacturing a heat exchanger, for example, as described below. First, the precoated fin material is cut into a desired size, whereby a fin is produced. The obtained fin was subjected to slit processing, louver formation, and collar (collar) processing using a press working machine in a proper combination to form slits, louvers, and collars. Thereafter, a plurality of fins are arranged with a predetermined interval therebetween, and a metal pipe for circulating a refrigerant is attached so as to penetrate the plurality of fins. Then, the outer diameter of the metal tube is enlarged by inserting a tube expansion plug into the metal tube, so that the metal tube and the fins are closely adhered. In this way, a heat exchanger can be obtained. The heat exchanger can be incorporated into, for example, an indoor unit, an outdoor unit, and the like of an air conditioner.
Examples
An embodiment of the pre-coated fin sheet is described with reference to fig. 1. As shown in fig. 1, the precoated fin sheet 1 of this example includes a substrate 2 containing aluminum and a resin coating film 3 formed on the substrate 2 and exposed on the surface. The resin coating film 3 contains a modified polyvinyl alcohol (a) having a molecular structure represented by the general formula (1) and an acrylamide polymer (B). The content of the modified polyvinyl alcohol (A) is 0.5 to 2.0 times the content of the acrylamide polymer (B) in terms of mass ratio. Hereinafter, a more specific example of the precoated fin sheet of this example will be described together with the production method thereof.
Test materials 1 to3
Test materials 1 to 3 shown in table 1 were produced by the following methods. First, the substrate 2 is prepared. As the substrate 2, a plate material containing aluminum may be used as it is, or a plate material having a base coating film formed in advance by a chemical conversion treatment may be used. The substrate 2 used in the test materials 1 to 3 was specifically composed of aluminum having a chemical composition indicated by alloy number 1050 in JIS H4000, and was an aluminum plate having a thickness of 0.1mm, which was subjected to tempering, indicated by type number H26 in JIS H0001. The substrate 2 is subjected to a chemical conversion treatment using a chromate phosphate solution, and a base coating 21 made of chromate phosphate is provided on both surfaces of the substrate 2.
Next, a coating material containing the modified polyvinyl alcohol (a) and the acrylamide polymer (B) in the mass ratio shown in table 1 was prepared. In table 1, "polyvinyl alcohol" is omitted as "PVA", and "acrylamide polymer" is omitted as "PAM".
The modified polyvinyl alcohol (a) used in the test materials 1 to 3 has a molecular structure represented by the following structural formula (2).
[ Chemical 3]
Wherein R 2 in the structural formula (2) is an organic group having a linear structure which has 7 carbon atoms and contains both a methylene group and a carbonyl group, and m and n are positive integers satisfying a relationship of 0.005.ltoreq.n/m.ltoreq.0.025.
The acid value of the acrylamide polymer (B) used in the test materials 1 to 3 was 50mgKOH/g, and the weight average molecular weight in terms of polystyrene was 30 ten thousand.
After the coating was applied on the substrate 2 using a bar coater, the coating was heated at 225 ℃ for 10 seconds to dry. By the above steps, the resin coating film 3 can be formed on the substrate 2, and the test materials 1 to 3 can be obtained. The thickness of the resin coating film 3 was 1. Mu.m.
As shown in fig. 1, the resin coating films 3 of the test materials 1 to 3 have a hydrophilic layer 31 having a phase 311 containing the modified polyvinyl alcohol (a) and a phase 312 containing the acrylamide polymer (B).
Test material 4 and test material 5
The test materials 4 and 5 have the same structure as the test materials 1 to 3 except that polyethylene glycol is contained in the resin coating film 3. The production methods of the test materials 4 and 5 were the same as those of examples 1 to 3, except that polyethylene glycol was added to the paint in the amounts shown in table 1. The polyethylene glycol used in the test materials 4 and 5 had a number average molecular weight of 6000. In table 1, "polyethylene glycol" is omitted as "PEG".
When polyethylene glycol is contained in the paint as in the test materials 4 and 5, the modified polyvinyl alcohol (a) and the acrylamide polymer (B) in the paint settle toward the substrate 2 side in the process of heating and drying the paint on the substrate. Thus, as shown in fig. 2, a hydrophilic layer 31 having a phase 311 containing the modified polyvinyl alcohol (a) and a phase 312 containing the acrylamide polymer (B) is formed on the base coating film 21 of the test material 4 and the test material 5.
On the other hand, polyethylene glycol has a lower viscosity than the modified polyvinyl alcohol (a) and the acrylamide polymer (B), and therefore floats to the surface side as the paint dries. Thereby, the lubricating layer 32 containing polyethylene glycol is formed on the hydrophilic layer 31. Thus, the resin coating films 302 of the test materials 4 and 5 have the lubricating layer 32 exposed on the surface and the hydrophilic layer 31 interposed between the lubricating layer 32 and the substrate 2.
Test Material 6 and test Material 7
The test materials 6 and 7 have the same constitution as the test materials 1 to 3 except that the ratio of the modified polyvinyl alcohol (a) to the acrylamide polymer (B) is outside the specific range.
Test Material 8
The test material 8 has the same constitution as the test material 4 and the test material 5 except that the content of polyethylene glycol is larger than the specific range.
Test Material 9
The test material 9 was produced by the same production method as the production methods of the test materials 1 to 3, except that unmodified polyvinyl alcohol (number average molecular weight 6000) was used instead of the modified polyvinyl alcohol (a).
The characteristics of each of the test materials 1 to 9 can be evaluated by the following methods.
Hydrophilic nature
The hydrophilicity of the test material can be evaluated based on the contact angle of water. In this example, the contact angle of water in each test material immediately after production and the contact angle of water in the test material after the degradation test were measured. The contact angle of water in each test material immediately after production is shown in table 1.
The contact angle of water immediately after production was measured, and then a degradation test was performed. In the degradation test, after the test materials were immersed in ion-exchanged water for 2 minutes, air was blown to each of the test materials for 6 minutes to dry the resin coating film 3 and the resin coating film 302, and this cycle was repeated for 300 cycles with 1 cycle. Then, water was added dropwise to the test material after completion of the degradation test, and the contact angle of water was measured. The contact angle of water in the test material after the degradation test is shown in table 1.
Oil repellency
The oil repellency of the test material can be evaluated based on the results of the cleaning test shown below. First, squares having a side length of 15mm were drawn on the resin coating film 3 and the resin coating film 302 of the test material using an oil dye mark pen, and the inside of the squares was filled with the oil dye mark pen, whereby an ink layer was attached to the resin coating film 3 and the resin coating film 302. As the oily dye Mark pen, for example, "TWIN MARKER MFN-15FB-B" manufactured by Baile Co., ltd.
Next, the test piece was vertically set up, and 150 times of water was sprayed on the portion of the test piece located above the ink layer using a sprayer. At this time, the water ejected from the atomizer was not brought into direct contact with the square. After the completion of the spraying, the area of the ink layer removed by the spraying was measured. Then, the ratio of the area of the ink layer removed by spraying to the area of the ink layer before spraying was expressed as a percentage, and the percentage was taken as the removal rate (unit:%)
The above cleaning test was performed on each of the test material immediately after the production and the test material after the degradation test, and the results are shown in the column "oil repellency" of table 1. In the column "oil repellency" in table 1, the removal rate of the ink layer is higher than 80% and is denoted by the symbol "a", the removal rate of the ink layer is higher than 60% and not higher than 80% is denoted by the symbol "B", the removal rate of the ink layer is higher than 40% and not higher than 60% is denoted by the symbol "C", the removal rate of the ink layer is higher than 20% and not higher than 40% is denoted by the symbol "D", and the removal rate of the ink layer is not higher than 20% is denoted by the symbol "E".
Adhesion of
The adhesion of the substrate 2 to the resin coating film 3 or the resin coating film 302 can be achieved by the method according to JIS K5600-5-6:1999, the method of cross-cutting as specified in the claims. Specifically, first, the resin coating film 3 was cut into a lattice shape using a cutter, and 100 square chips each having a side length of 2mm were formed on the resin coating film 3 and the resin coating film 302. Transparent adhesive tape was attached as an adhesive tape to these square chips. Then, the transparent adhesive tape was peeled off at an angle of 45 ° to the substrate 2, and the number of square chips remaining on the substrate 2 was counted. In the column "adhesion" in table 1, the case where all square chips remain on the substrate 2 is referred to as "good", and the case where 1 or more square chips are peeled off from the substrate 2 is referred to as "Bad".
TABLE 1
As shown in table 1, the test materials 1 to 5 have resin coating films having the compositions within the specific ranges on the substrates. Therefore, the contact angle of water immediately after the production of these test materials was 20 ° or less, and the test materials showed excellent hydrophilicity immediately after the production. In addition, the contact angle of water after the degradation test of these test materials was 30 ° or less, and high hydrophilicity was maintained for a long period of time. Further, these test materials were also excellent in oil repellency immediately after production and oil repellency after degradation test.
On the other hand, the mass ratio of the modified polyvinyl alcohol (a) to the acrylamide polymer (B) in the test material 6 is smaller than the specific range. Therefore, the hydrophilicity and oil repellency of the test material 6 after the degradation test were reduced as compared with those of the test materials 1 to 5.
As shown in table 1, the mass ratio of the modified polyvinyl alcohol (a) to the acrylamide polymer (B) in the test material 7 is greater than the specific range. Therefore, the oil repellency of the test material 7 after the degradation test was lower than that of the test materials 1 to 5.
The polyethylene glycol content in the test material 8 is more than the specific range. Therefore, the adhesion of the resin coating film of the test material 8 is lower than that of the test materials 1 to 5.
Since the test material 9 contains unmodified polyvinyl alcohol instead of the modified polyvinyl alcohol (a), the structure of the hydrophilic layer of the test material 9 is different from those of the test materials 1 to 5. The hydrophilicity of the test material 9 after the degradation test was reduced as compared with the test materials 1 to 5.
The specific embodiment of the precoated fin sheet according to the present invention is not limited to the embodiment described above, and may be appropriately modified within a range not impairing the gist of the present invention. For example, in the above-described examples and experimental examples, the pre-coated fin sheet 1 in which the base coating film 21 is formed on the substrate 2 has been shown, but the chemical conversion treatment for forming the base coating film 21 may be omitted, and the resin coating film 3 may be directly formed on the substrate 2. Further, the chemical conversion treatment for forming the base coating film 21 may be omitted, and the corrosion-resistant coating film and the resin coating film 3 may be sequentially formed on the substrate 2.
Claims (12)
1. A pre-coated fin sheet having:
An aluminum-containing substrate; and
A resin coating film formed on the substrate and exposed on the surface,
The resin coating film contains a modified polyvinyl alcohol (A) having a molecular structure represented by the following general formula (1) and an acrylamide polymer (B),
The content of the modified polyvinyl alcohol (A) is 0.7 to 2.0 times the content of the acrylamide polymer (B) in terms of mass ratio,
R 1 in the general formula (1) is an organic group having a linear structure and having 5 to 10 carbon atoms, which contains a plurality of methylene groups and 1 or more carbonyl groups, m and n are positive integers satisfying a relationship of 0.005 to n/m to 0.025,
The acrylamide polymer (B) is polyacrylamide.
2. The precoated fin sheet according to claim 1, wherein polyethylene glycol is further contained in the resin coating film.
3. The precoated fin sheet according to claim 1 or 2, wherein the resin coating film further contains 1 or 2 or more compounds selected from the group consisting of blocked isocyanate compounds and melamine resins.
4. The precoated fin sheet according to claim 1 or 2, wherein at least one of an antibacterial agent and a mildew preventive is further contained in the resin coating film.
5. The precoated fin sheet according to claim 3, wherein at least one of an antibacterial agent and a mold inhibitor is further contained in the resin coating film.
6. The precoated fin sheet according to claim 1 or 2, wherein the resin coating film contains fluororesin particles containing a perfluoroalkyl group-containing fluororesin and having a median particle diameter of 1 μm or more and 4 μm or less on a volume basis.
7. The precoated fin sheet according to claim 3, wherein the resin coating film contains fluororesin particles containing a perfluoroalkyl group-containing fluororesin and having a median particle diameter of 1 μm or more and 4 μm or less on a volume basis.
8. The precoated fin sheet according to claim 4, wherein the resin coating film contains fluororesin particles containing a perfluoroalkyl group-containing fluororesin and having a median particle diameter of 1 μm or more and 4 μm or less on a volume basis.
9. The precoated fin sheet according to claim 1 or 2, wherein the precoated fin sheet has a corrosion-resistant coating film interposed between the substrate and the resin coating film, the corrosion-resistant coating film containing 1 or 2 or more resins selected from the group consisting of an acrylic resin, an epoxy resin, and a polyurethane resin.
10. The precoated fin sheet according to claim 3, wherein the precoated fin sheet has a corrosion-resistant coating film interposed between the substrate and the resin coating film, the corrosion-resistant coating film containing 1 or 2 or more resins selected from the group consisting of an acrylic resin, an epoxy resin, and a polyurethane resin.
11. The precoated fin sheet according to claim 4, wherein the precoated fin sheet has a corrosion-resistant coating film interposed between the substrate and the resin coating film, the corrosion-resistant coating film containing 1 or 2 or more resins selected from the group consisting of an acrylic resin, an epoxy resin, and a polyurethane resin.
12. The precoated fin sheet according to claim 6, wherein the precoated fin sheet has a corrosion-resistant coating film interposed between the substrate and the resin coating film, the corrosion-resistant coating film containing 1 or 2 or more resins selected from the group consisting of an acrylic resin, an epoxy resin, and a polyurethane resin.
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| PCT/JP2021/028901 WO2022034838A1 (en) | 2020-08-13 | 2021-08-04 | Precoated fin material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002038134A (en) * | 2000-05-17 | 2002-02-06 | Kansai Paint Co Ltd | Hydrophilization treating composition for heat exchanger fin material |
| JP2019100675A (en) * | 2017-12-07 | 2019-06-24 | 株式会社Uacj | Precoat fin material |
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| JPH1036757A (en) * | 1996-07-23 | 1998-02-10 | Dai Ichi Kogyo Seiyaku Co Ltd | Hydrophilic surface treatment agent for heat exchanger fin |
| JP2002285140A (en) | 2001-03-27 | 2002-10-03 | Nippon Paint Co Ltd | Hydrophilizing agent, method for hydrophilizing and aluminum or aluminum alloy material subjected to hydrophilizing |
| JP4942251B2 (en) | 2001-03-27 | 2012-05-30 | 日本ペイント株式会社 | Hydrophilization treatment agent, hydrophilization treatment method, and hydrophilized aluminum material or aluminum alloy material |
| WO2012165494A1 (en) | 2011-05-31 | 2012-12-06 | 関西ペイント株式会社 | Hydrophilic coating material composition and hydrophilizing method |
| JP2019086267A (en) | 2017-11-10 | 2019-06-06 | 株式会社Uacj | Precoat fin material |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002038134A (en) * | 2000-05-17 | 2002-02-06 | Kansai Paint Co Ltd | Hydrophilization treating composition for heat exchanger fin material |
| JP2019100675A (en) * | 2017-12-07 | 2019-06-24 | 株式会社Uacj | Precoat fin material |
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