CN115507570A - Aluminum fin material - Google Patents
Aluminum fin material Download PDFInfo
- Publication number
- CN115507570A CN115507570A CN202210554875.0A CN202210554875A CN115507570A CN 115507570 A CN115507570 A CN 115507570A CN 202210554875 A CN202210554875 A CN 202210554875A CN 115507570 A CN115507570 A CN 115507570A
- Authority
- CN
- China
- Prior art keywords
- coating layer
- icing
- aluminum
- fin material
- frosting
- 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.)
- Granted
Links
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 96
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 239000000463 material Substances 0.000 title claims abstract description 72
- 239000011247 coating layer Substances 0.000 claims abstract description 189
- 239000011347 resin Substances 0.000 claims abstract description 81
- 229920005989 resin Polymers 0.000 claims abstract description 81
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 49
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 33
- 150000001408 amides Chemical class 0.000 claims abstract description 16
- 150000001450 anions Chemical class 0.000 claims abstract description 15
- 150000001735 carboxylic acids Chemical class 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 125000000129 anionic group Chemical group 0.000 claims abstract description 14
- 125000003368 amide group Chemical group 0.000 claims abstract description 7
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 51
- 230000007797 corrosion Effects 0.000 claims description 44
- 238000005260 corrosion Methods 0.000 claims description 44
- 238000011282 treatment Methods 0.000 claims description 32
- 230000001050 lubricating effect Effects 0.000 claims description 30
- 239000003431 cross linking reagent Substances 0.000 claims description 16
- 229910010272 inorganic material Inorganic materials 0.000 claims description 16
- 239000011147 inorganic material Substances 0.000 claims description 16
- 239000002210 silicon-based material Substances 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 230000002265 prevention Effects 0.000 abstract description 16
- -1 polypropylene Polymers 0.000 abstract description 13
- 239000004743 Polypropylene Substances 0.000 abstract 1
- 229920001155 polypropylene Polymers 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 38
- 239000011248 coating agent Substances 0.000 description 35
- 238000000576 coating method Methods 0.000 description 35
- 230000015572 biosynthetic process Effects 0.000 description 27
- 239000008199 coating composition Substances 0.000 description 24
- 238000009833 condensation Methods 0.000 description 19
- 230000005494 condensation Effects 0.000 description 19
- 230000005764 inhibitory process Effects 0.000 description 15
- 239000004094 surface-active agent Substances 0.000 description 14
- 239000000654 additive Substances 0.000 description 12
- 239000007787 solid Substances 0.000 description 11
- 125000000542 sulfonic acid group Chemical group 0.000 description 10
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 9
- 229920000642 polymer Polymers 0.000 description 9
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 8
- 239000002202 Polyethylene glycol Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 8
- 229920001223 polyethylene glycol Polymers 0.000 description 8
- 125000002091 cationic group Chemical group 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 7
- 239000000178 monomer Substances 0.000 description 7
- 239000003973 paint Substances 0.000 description 7
- 230000001629 suppression Effects 0.000 description 7
- 239000004925 Acrylic resin Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- 239000002736 nonionic surfactant Substances 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 239000004721 Polyphenylene oxide Chemical group 0.000 description 5
- 229920001213 Polysorbate 20 Polymers 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 230000003993 interaction Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229920000570 polyether Chemical group 0.000 description 5
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 description 5
- 229920002503 polyoxyethylene-polyoxypropylene Polymers 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 239000004372 Polyvinyl alcohol Substances 0.000 description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 229920006243 acrylic copolymer Polymers 0.000 description 4
- 239000003242 anti bacterial agent Substances 0.000 description 4
- 239000002518 antifoaming agent Substances 0.000 description 4
- 229940121375 antifungal agent Drugs 0.000 description 4
- 239000003429 antifungal agent Substances 0.000 description 4
- 239000003963 antioxidant agent Substances 0.000 description 4
- 239000003125 aqueous solvent Substances 0.000 description 4
- 238000005102 attenuated total reflection Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 229910052809 inorganic oxide Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000003607 modifier Substances 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 230000000704 physical effect Effects 0.000 description 4
- 229920002451 polyvinyl alcohol Polymers 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 238000009736 wetting Methods 0.000 description 4
- 229920000178 Acrylic resin Polymers 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 3
- 239000003945 anionic surfactant Substances 0.000 description 3
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000001818 polyoxyethylene sorbitan monostearate Substances 0.000 description 3
- 235000010989 polyoxyethylene sorbitan monostearate Nutrition 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- GQTFHSAAODFMHB-UHFFFAOYSA-N 2-prop-2-enoyloxyethanesulfonic acid Chemical compound OS(=O)(=O)CCOC(=O)C=C GQTFHSAAODFMHB-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 229920002125 Sokalan® Polymers 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000003093 cationic surfactant Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000008119 colloidal silica Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- LEQAOMBKQFMDFZ-UHFFFAOYSA-N glyoxal Chemical compound O=CC=O LEQAOMBKQFMDFZ-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 2
- 125000000466 oxiranyl group Chemical group 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 239000005871 repellent Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- QWUWMCYKGHVNAV-UHFFFAOYSA-N 1,2-dihydrostilbene Chemical group C=1C=CC=CC=1CCC1=CC=CC=C1 QWUWMCYKGHVNAV-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- IMSODMZESSGVBE-UHFFFAOYSA-N 2-Oxazoline Chemical group C1CN=CO1 IMSODMZESSGVBE-UHFFFAOYSA-N 0.000 description 1
- 125000003504 2-oxazolinyl group Chemical group O1C(=NCC1)* 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- RPURHYOXDAYDLC-UHFFFAOYSA-N S(=O)(=O)(O)CCC(C(=O)O)=C.C(C=C)(=O)OCCS(=O)(=O)O Chemical compound S(=O)(=O)(O)CCC(C(=O)O)=C.C(C=C)(=O)OCCS(=O)(=O)O RPURHYOXDAYDLC-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000005215 alkyl ethers Chemical class 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 229920005603 alternating copolymer Polymers 0.000 description 1
- 239000002519 antifouling agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000013556 antirust agent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 125000001797 benzyl group Chemical group [H]C1=C([H])C([H])=C(C([H])=C1[H])C([H])([H])* 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000012986 chain transfer agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- WMYWOWFOOVUPFY-UHFFFAOYSA-L dihydroxy(dioxo)chromium;phosphoric acid Chemical compound OP(O)(O)=O.O[Cr](O)(=O)=O WMYWOWFOOVUPFY-UHFFFAOYSA-L 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229940015043 glyoxal Drugs 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 230000006910 ice nucleation Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 150000002763 monocarboxylic acids Chemical class 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 125000003566 oxetanyl group Chemical group 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 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
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920005749 polyurethane resin Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- SEZALEWRXURRKG-UHFFFAOYSA-N prop-2-enoic acid;zirconium Chemical compound [Zr].OC(=O)C=C SEZALEWRXURRKG-UHFFFAOYSA-N 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 description 1
- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 125000001302 tertiary amino group Chemical group 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 150000000000 tetracarboxylic acids Chemical class 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 150000003628 tricarboxylic acids Chemical class 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 238000004804 winding Methods 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
- 229910052726 zirconium Inorganic materials 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
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
-
- 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
-
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F17/00—Removing ice or water from heat-exchange apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
- F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
Abstract
Provided is an aluminum fin material having an icing/frosting prevention coating layer having an excellent icing/frosting prevention effect. An aluminum fin material (10) comprising an aluminum sheet (1) and a coating layer (2) formed on the surface of the aluminum sheet (1), wherein the coating layer (2) comprises an amphoteric polypropylene-containing materialThe icing/frosting inhibiting coating layer of the amide resin is 1730 to 1710cm in the infrared absorption spectrum of the amphoteric polyacrylamide resin obtained by the ATR method using an infrared spectrophotometer －1 The peak intensity D observed corresponding to the anionic group of the amphoteric polyacrylamide resin Anion(s) And at 1660-1640 cm －1 The peak intensity D corresponding to the amide group of the amphoteric polyacrylamide resin was observed Amides of carboxylic acids Ratio D of Anion(s) /D Amides of carboxylic acids Is 0.30 or less.
Description
Technical Field
The present invention relates to an aluminum fin material, and more particularly to an aluminum fin material suitable for use in a heat exchanger of an air conditioner or the like.
Background
Heat exchangers are used in products in various fields such as room air conditioners, combination air conditioners, refrigerated showcases, refrigerators, oil coolers, radiators and the like. The fin of the heat exchanger is generally made of aluminum or an aluminum alloy having excellent thermal conductivity, workability, corrosion resistance, and the like. Plate fin and plate tube heat exchangers have a structure in which fin materials are arranged in parallel at narrow intervals.
When the surface temperature of the fin material of the heat exchanger becomes a dew point or lower, dew condensation water adheres thereto. If the hydrophilicity of the fin surface is low, the contact angle of the adhering dew condensation water becomes large, and therefore what is called water splash is scattered into the living environment. When such a dew condensation water pool becomes large, a bridge is formed between the adjacent fin members, and the ventilation path between the fin members is blocked, thereby increasing the ventilation resistance.
For the purpose of preventing such splashing and reducing ventilation resistance, for example, patent document 1 proposes a technique of forming a hydrophilic coating film on the surface of a fin material by coating.
On the other hand, when the air conditioner is operated for heating operation or the like, the surface temperature of the heat exchanger is below the freezing point, and the dew condensation water adhering to the surface of the fin material is frozen or frozen. If the hydrophilicity is excessively increased, the above-mentioned icing and frosting are liable to occur. If the inter-fin members are clogged due to freezing and frost formation, the heat exchange efficiency of the heat exchanger is significantly reduced, and thus a defrosting operation or the like is required.
Therefore, various techniques for suppressing the icing and frosting on the fin material have been studied. For example, patent document 2 discloses that fluoroalkoxysilane having a critical surface tension of 20dyn/cm or less is chemisorbed on the surface of an air-side heat transfer surface, and CF is formed on the outermost surface 3 The coating film has a structure of orientation, thereby providing high water repellency and preventing frosting. Patent document 3 discloses that the surface area of water droplets (snow and ice) is reduced and the adhesion is reduced by forming a water-repellent coating on the surface and setting the surface average roughness Ra to 20 μm or more.
However, in the above case, there is a concern that the water repellency deteriorates with time, and the durability deteriorates due to a decrease in the strength of the water-repellent coating film when the surface average roughness Ra is increased.
Patent document 4 discloses a heat exchanger having, as a heat transfer portion, a first layer and a second layer located on the air side with respect to the first layer, the second layer being composed of a polymer layer having a plurality of polymer chains, and the main chains of adjacent polymer chains have a network structure of metal oxide at the first layer side and are bonded to each other. Accordingly, since the polymer chains of the second layer can be bonded to the first layer at a high density in the vertical direction, the hydrophilicity of the surface of the heat transfer portion can be reliably increased, and even when condensed water is generated on the surface of the heat transfer portion, the growth of frost can be sufficiently retarded.
Documents of the prior art
Patent literature
Patent document 1: japanese patent No. 2520308
Patent document 2: japanese patent laid-open publication No. 10-281690
Patent document 3: japanese laid-open patent publication No. 9-228073
Patent document 4: japanese patent laid-open publication No. 2019-158247
Disclosure of Invention
Problems to be solved by the invention
However, in the heat exchanger of patent document 4, no specific studies have been made concerning the suppression of icing and frosting. Further, it cannot be said that the inhibition of ice and frost formation is also improved if the hydrophilicity is increased, and a separate test is required for the inhibition of ice and frost formation.
The present invention aims to provide an aluminum fin material having an icing/frosting prevention coating layer having an excellent icing/frosting prevention effect.
Means for solving the problems
The present invention relates to the following [1] to [6].
[1] An aluminum fin material having an aluminum plate and a film coating layer formed on a surface of the aluminum plate,
the skin layer comprises an icing/frosting inhibiting skin layer comprising an amphoteric polyacrylamide resin,
the infrared absorption spectrum of the amphoteric polyacrylamide resin obtained by ATR method using infrared spectrophotometer is 1730-1710 cm －1 The peak intensity D observed corresponding to the anionic group of the amphoteric polyacrylamide resin Anion(s) And 1660-1640 cm －1 The peak intensity D corresponding to the amide group of the amphoteric polyacrylamide resin was observed Amides of carboxylic acids Ratio of D Anion(s) /D Amides of carboxylic acids Is 0.30 or less.
[2] The aluminum fin material according to the item [1], wherein the icing frost suppression coating layer further contains an inorganic material.
[3] The aluminum fin material according to the above [2], wherein the inorganic material is a silicon-containing compound.
[4] The aluminum fin material according to any one of the above [1] to [3], wherein the icing/frost-formation inhibiting coating layer further contains a crosslinking agent.
[5] The aluminum fin material according to any one of the above [1] to [4], wherein the coating layer further includes at least one selected from the group consisting of a corrosion-resistant coating layer, a hydrophilic coating layer, and a lubricating coating layer.
[6] The aluminum fin material according to any one of the above [1] to [5], further comprising a base treatment layer between the aluminum plate and the coating layer.
Effects of the invention
According to the invention, the formation of ice nuclei can be inhibited by the interaction of the dew-forming water attached to the surface of the fin material and the icing/frosting inhibiting skin layer. As a result, it is possible to provide an aluminum fin material in which freezing of dew condensation water is delayed and surface icing and frosting can be appropriately suppressed.
Drawings
Fig. 1 is a schematic cross-sectional view showing one embodiment of the configuration of an aluminum fin material.
Fig. 2 is a schematic cross-sectional view showing one embodiment of the aluminum fin material.
Description of the symbols
1. Aluminium plate
2. Coating layer
2a icing and frosting inhibiting skin layer
2b Corrosion resistant coating layer
2c hydrophilic coating layer
2d lubricating coating layer
10. Aluminum fin material
Detailed Description
The following describes in detail the mode of the aluminum fin material used for carrying out the present invention. "to" indicating a numerical range is used as the lower limit value and the upper limit value including the numerical values before and after the range.
< aluminum Fin sheet >
The aluminum fin material 10 of the present embodiment (hereinafter simply referred to as "fin material") has, as shown in fig. 1, an aluminum plate 1 and a coating layer 2 formed on the surface of the aluminum plate 1. The skin layer 2 is provided with an icing/frosting inhibition skin layer 2a comprising an amphoteric polyacrylamide resin.
The coating layer 2 may further include at least one selected from the group consisting of a corrosion-resistant coating layer, a hydrophilic coating layer, and a lubricating coating layer. When all of these coating layers are provided, for example, as shown in fig. 2, a corrosion-resistant coating layer 2b, a hydrophilic coating layer 2c, and a lubricating coating layer 2d are provided in this order from the aluminum plate 1 side.
In fig. 2, the icing/frost-formation-suppressing coating layer 2a is located between the hydrophilic coating layer 2c and the lubricating coating layer 2d, but the location of the icing/frost-formation-suppressing coating layer 2a is not limited thereto. That is, the icing/frost formation inhibiting coating layer 2a may be present between the aluminum plate 1 and the corrosion-resistant coating layer 2b, between the corrosion-resistant coating layer 2b and the hydrophilic coating layer 2c, between the hydrophilic coating layer 2c and the lubricating coating layer 2d, or may be present on the outermost layer.
In addition, the icing/frosting inhibiting coating layer 2a can also have the effect of the hydrophilic coating layer 2 c. As will be described in detail later, for example, by further including a crosslinking agent in the icing/frost formation inhibiting coating layer 2a, a hydrophilic effect can be more suitably obtained, and the icing/frost formation inhibiting coating layer having both the function of the hydrophilic coating layer and the function of icing/frost formation inhibiting can be obtained.
A base treatment layer may be further provided between the aluminum plate 1 and the coating layer 2.
At least one surface of aluminum plate 1 may be structured as described above, and both surfaces of aluminum plate 1 may be structured as described above. When both surfaces of aluminum plate 1 have the above-described structure, the both surfaces may be the same or different.
(icing frost-formation inhibiting skin layer)
The icing/frosting suppressing skin layer 2a contains an amphoteric polyacrylamide-based resin. The amphoteric polyacrylamide resin is an amphoteric polymer having a cationic group and an anionic group. The amphoteric polyacrylamide resin may be used alone or in combination of two or more.
The amphoteric polyacrylamide resin is composed of a cationic group having a positive charge in the molecule and an anionic group having a negative charge.
Polar group moiety in cationic group of amphoteric polyacrylamide resin with-NR 3 + The structure of the primary amino group, the secondary amino group, the tertiary amino group or the quaternary ammonium salt is exemplified. R is a hydrogen atom, a linear or branched alkyl group having 1 to 5 carbon atoms, a salt or the like.
Examples of the polar group moiety of the anionic group of the amphoteric polyacrylamide resin include unsaturated monocarboxylic acids, unsaturated dicarboxylic acids, unsaturated tricarboxylic acids, unsaturated tetracarboxylic acids, unsaturated sulfonic acids, unsaturated phosphonic acids, and salts thereof.
The method for producing the amphoteric polyacrylamide resin is not particularly limited, and conventionally known methods can be applied. For example, the monomer can be obtained by a polymerization reaction of acrylamide with a cationic monomer having a cationic group and an anionic monomer having an anionic group. In addition, other monomers may be added as necessary.
These polymerization reactions can be started by, for example, adding an initiator, or a chain transfer agent may be added as needed. Further, commercially available amphoteric polyacrylamide resins can be used.
The icing/frosting inhibition coating layer containing the amphoteric polyacrylamide resin was observed at 1720cm in an infrared absorption spectrum obtained by ATR (Attenuated Total Reflection) method using an infrared spectrophotometer －1 The near area is 1730-1710 cm －1 A peak corresponding to an anionic group of the amphoteric polyacrylamide resin was observed in the range of (1). In addition, at 1650cm －1 Nearby 1660-1640 cm －1 A peak corresponding to an amide group of the amphoteric polyacrylamide resin was observed in the range of (1).
1730 to 1710cm in this range －1 Observed peak intensity D corresponding to the anionic group of amphoteric polyacrylamide resin Anion(s) And 1660-1640 cm －1 Observed peak intensity D corresponding to amide group of amphoteric polyacrylamide resin Amides of carboxylic acids Ratio of (D) Anion(s) /D Amides of carboxylic acids When the amount is 0.30 or less, good icing/frosting inhibitory properties can be obtained.
The reason for this is not clear, but in the inhibition of the formation of ice nuclei of dew condensation water adhering to the surface of the fin material, the strength of interaction between the dew condensation water and the icing/frost-formation inhibiting coating layer is concerned, and if D Anion(s) /D Amides of carboxylic acids When the peak intensity ratio is too high, the formation of ice nuclei due to the interaction between the icing/frosting inhibition coating layer and the dew condensation water cannot be inhibited, and when the ratio is 0.30 or less, the formation of ice nuclei is inhibited by the interaction between the icing/frosting inhibition coating layer and the dew condensation water. The result is thatGood icing and frosting inhibition performance can be obtained.
From D Anion(s) /D Amides of carboxylic acids The peak intensity ratio may be 0.30 or less, preferably 0.27 or less, and more preferably 0.25 or less. The lower limit of the peak intensity ratio is not particularly limited, but is preferably 0.05 or more, and more preferably 0.10 or more, from the viewpoint of frost formation retardation.
The icing/frosting inhibiting coating layer preferably contains a crosslinking agent in addition to the amphoteric polyacrylamide resin, from the viewpoint of improving hydrophilicity.
As the crosslinking agent, conventionally known crosslinking agents can be used, and examples thereof include those containing an oxazoline group, an oxirane group (1,2-epoxy structure), an oxetanyl group (1,3-epoxy structure), an isocyanate group, a blocked isocyanate group and the like. Among these, oxazoline group-and oxirane group-containing crosslinking agents are more preferable. When sufficient hydrophilicity is obtained by containing a crosslinking agent, the fin material can also have the effect of a hydrophilic coating layer without providing a separate hydrophilic coating layer, and the icing/frosting prevention coating layer.
The icing/frosting inhibiting coating layer preferably contains a surfactant in addition to the amphoteric polyacrylamide resin, from the viewpoint of improving hydrophilicity. By containing the surfactant, even when the fin material further includes a lubricating coating layer, the workability and hydrophilicity of the lubricating coating layer can be improved. This is believed to be based on the performance of the surfactant.
The surfactant may be any of anionic, cationic and nonionic surfactants, but a nonionic surfactant is preferable from the viewpoint of ease of dispersion in the icing/frosting prevention coating layer.
Examples of the anionic surfactant include polyoxyethylene alkyl ethers
(polyoxyethylenealkyl ethers), polyoxyethylene alkyl ether phosphates
Polyoxyethylene alkyl ether sulfates, polyoxyethylene alkyl sulfosuccinates, polyoxyethylene polyoxypropylene block copolymers, and the like.
Examples of the nonionic surfactant include ethylenediamine polyoxypropylene-polyoxyethylene condensates (polyoxyethylene-polyoxyethylene condensates), polyoxyethylene sorbitan monolaurates (polyoxyethylene sorbitan monolaurates), polyoxyethylene polyoxypropylene block polymers (polyoxyethylene polyoxypropylene block polymers), and polyoxyethylene sorbitan monostearate (polyoxyethylene sorbitan monolaurates).
The icing/frosting inhibiting coating layer preferably further contains an inorganic material from the viewpoint of improving hydrophilicity. The inorganic material includes a silicon-containing compound and a titanium-containing compound, and examples thereof include colloidal silica, sodium silicate, a silicon oligomer, a silane coupling agent, titanium alkoxide, and titanium oxide.
The icing/frosting prevention coating layer can be formed by applying a coating composition containing an amphoteric polyacrylamide resin on an aluminum sheet or layer on which the icing/frosting prevention coating layer is formed, and curing the coating composition by drying or the like.
The content of the amphoteric polyacrylamide-based resin in the icing/frosting inhibition coating layer is preferably 60 mass% or more, more preferably 70 mass% or more, still more preferably 75 mass% or more, and most preferably 80 mass% or more in terms of a solid content composition ratio. The upper limit of the content is not particularly limited, and may be 100% by mass in terms of the solid content composition ratio, that is, may be composed of only the amphoteric polyacrylamide resin.
When the icing/frosting prevention coating layer contains a crosslinking agent, the content of the crosslinking agent is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and further preferably 20 parts by mass or less, more preferably 10 parts by mass or less in terms of a solid content composition ratio with respect to 100 parts by mass of the amphoteric polyacrylamide resin.
When the icing/frosting prevention coating layer contains a surfactant, the content of the surfactant is preferably 0.1 part by mass or more, more preferably 0.5 part by mass or more, and further preferably 2 parts by mass or less, more preferably 1.5 parts by mass or less in terms of a solid content ratio with respect to 100 parts by mass of the amphoteric polyacrylamide resin.
When the icing/frosting prevention coating layer contains an inorganic material, the content of the inorganic material is preferably 1 part by mass or more, more preferably 5 parts by mass or more, and further preferably 35 parts by mass or less, more preferably 30 parts by mass or less in terms of a solid content composition ratio with respect to 100 parts by mass of the amphoteric polyacrylamide resin.
The amount of the coating in the icing/frosting inhibiting coating layer is preferably 0.01g/m from the viewpoint of obtaining a sufficient icing/frosting inhibiting effect 2 Above, more preferably 0.02g/m 2 Above, more preferably 0.05g/m 2 Above, more preferably 0.1g/m 2 As described above. In addition, from the viewpoint of suppressing a decrease in heat exchange efficiency of the fin, the coating amount of the icing/frosting suppressing coating layer is preferably 5.0g/m 2 Hereinafter, more preferably 2.5g/m 2 The following.
The icing/frosting inhibiting coating layer may contain other optional components within a range not to impair the effects of the present invention. Examples of the other optional components include various aqueous solvents and paint additives for improving the coatability, workability, physical properties of the coating layer, and the like.
Examples of the paint additives include water-soluble organic solvents, surface modifiers, wetting dispersants, anti-settling agents, antioxidants, antifoaming agents, rust inhibitors, antibacterial agents, and antifungal agents. These coating additives may be contained in one kind or two or more kinds.
The thickness of the ice/frost formation-suppressing coating layer is not particularly limited, but it is assumed that the density of the ice/frost formation-suppressing coating layer is 1g/cm 3 The thickness is preferably 0.01 μm or more, more preferably 0.1 μm or more, and still more preferably 0.3 μm or more, from the viewpoint of obtaining good icing/frosting inhibition performance. From the viewpoint of obtaining good coating workability in forming the coating layer, it is preferably 5 μm or less, and more preferably 2.5 μm or less.
The thickness of the ice/frost formation-suppressing coating layer can be adjusted by selecting the concentration of the coating composition used for forming the ice/frost formation-suppressing coating layer, the bar coater No. and the like.
(aluminium plate)
The aluminum plate is a concept including a plate made of aluminum and a plate made of an aluminum alloy, and an aluminum plate conventionally used for aluminum fin materials can be used.
As the aluminum plate, from the viewpoint of excellent thermal conductivity and workability, JIS H4000: 2014, 1000 series aluminum. More specifically, as the aluminum plate, aluminum of alloy nos. 1050, 1070, and 1200 is more preferable. However, in the above description, the use of 2000 series to 9000 series aluminum alloys and other aluminum plates is not excluded.
The aluminum plate is suitably formed to a desired thickness in accordance with the use, specification, and the like of the fin material. The fin material for a heat exchanger is preferably 0.08mm or more, more preferably 0.1mm or more, in thickness from the viewpoint of strength of the fin and the like. On the other hand, the thickness is preferably 0.3mm or less, more preferably 0.2mm or less, from the viewpoint of workability to the fin, heat exchange efficiency, and the like.
(Corrosion-resistant coating layer)
The corrosion-resistant coating layer may be formed on the aluminum plate mainly for the purpose of improving the corrosion resistance of the aluminum plate, and preferably contains a hydrophobic resin.
When the base treatment layer is formed on the surface of the aluminum plate, the corrosion-resistant coating layer is formed on the base treatment layer. In addition, when the icing/frosting inhibiting coating layer is formed on the aluminum plate or the base treatment layer, a corrosion resistant coating layer may be formed thereon.
The corrosion-resistant coating layer can be formed by, for example, applying a coating composition containing a hydrophobic resin on an aluminum plate or a layer thereof, and drying, baking, or the like.
The corrosion-resistant coating layer makes it difficult for moisture such as dew condensation water, oxygen, and ion species such as chloride ions to enter the aluminum sheet, and corrosion of the aluminum sheet and generation of aluminum oxide which causes odor can be suppressed.
As the hydrophobic resin in the corrosion-resistant coating layer, conventionally known ones can be used. For example, various resins of polyester, polyolefin, melamine, epoxy, urethane and acrylic are mentioned, and one kind or a mixture of two or more kinds thereof can be applied.
The corrosion-resistant coating layer may contain other optional components in addition to the above-described components within a range not to impair the effects of the present invention. Examples of the optional component include various aqueous solvents and paint additives for improving coatability, workability, and physical properties of the coating film.
Examples of such coating additives include water-soluble organic solvents, crosslinking agents, surfactants, surface modifiers, wetting dispersants, anti-settling agents, antioxidants, antifoaming agents, rust inhibitors, antibacterial agents, and antifungal agents. These coating additives may include one kind or two or more kinds.
The coating amount of the corrosion-resistant coating layer is not particularly limited, but is preferably 0.05g/m from the viewpoint of imparting sufficient corrosion resistance to the aluminum sheet 2 Above, more preferably 0.2g/m 2 The above. On the other hand, the coating amount of the corrosion-resistant coating layer is preferably 15g/m from the viewpoint of suppressing a decrease in heat exchange efficiency of the fin 2 Hereinafter, it is more preferably 3g/m 2 The following.
The thickness of the corrosion-resistant coating layer is preferably 0.05 μm or more from the viewpoint of obtaining good corrosion resistance. In addition, from the viewpoint of good film forming properties, reduction of defects such as cracks, and suppression of the thermal resistance of the corrosion-resistant coating layer to be low, thereby obtaining good fin heat exchange efficiency, it is preferably 15 μm or less.
The thickness of the corrosion-resistant coating layer and the coating amount of the corrosion-resistant coating layer can be adjusted by, for example, the concentration of the coating composition used for forming the corrosion-resistant coating layer, and the selection of the bar coater no.
(hydrophilic coating layer)
The hydrophilic coating layer is a coating layer for providing hydrophilicity to the surface of the fin material, and contains a conventionally known hydrophilic resin.
The hydrophilic resin may have a hydrophilic group, and may contain one kind of resin or two or more kinds of resins. Examples of the hydrophilic group include a hydroxyl group (hydroxyl group), a carboxyl group, a sulfonic acid group, and a polyether group.
Examples of the hydrophilic resin having a hydroxyl group include polyethylene glycol (PEG) and polyvinyl alcohol (PVA). Examples of the hydrophilic resin having a carboxyl group include polyacrylic acid (PAA). Examples of the hydrophilic resin having a hydroxyl group and a carboxyl group include carboxymethyl cellulose (CMC). Examples of the hydrophilic resin having a sulfonic acid group include sulfoethyl acrylate (sulfoethyl acrylate). Examples of the hydrophilic resin having a polyether group include polyethylene glycol (PEG) and modified compounds thereof.
Among these, even if a lubricating coating layer is formed on the surface of the hydrophilic coating layer, from the viewpoint of more appropriately exhibiting desired hydrophilicity, the hydrophilic resin is preferably one containing a sulfonic acid group or one containing a polyether group, i.e., one containing an ether bond, more preferably one containing a sulfonic acid group and an ether bond, and particularly preferably one containing a sulfonic acid group and an ether bond.
The acrylic resin containing a sulfonic acid group and an ether bond is an acrylic resin containing an unsaturated double bond group and a sulfonic acid group, and examples thereof include a polyvinyl ether-sulfonic acid acrylic copolymer (polyvinyl ether-sulfonic acid-acrylic copolymer), a dibenzyl ether-sulfonic acid acrylic copolymer (benzyl ether-sulfonic acid-acrylic copolymer), and the like. The acrylic resin containing sulfonic acid groups and ether bonds is not limited to these.
The hydrophilic resin may be a copolymer of two or more monomers having a hydrophilic group, in addition to the above. Copolymers of acrylic acid and sulfoethyl acrylate may be mentioned, for example. The method for arranging the monomers of the copolymer is not particularly limited, and may be an alternating copolymer, a block copolymer, a graft copolymer, a random copolymer, or the like.
The hydrophilic coating layer preferably contains a surfactant in addition to the hydrophilic resin. This makes it possible to achieve the processability of the lubricating coating layer formed on the hydrophilic coating layer in combination with more favorable hydrophilicity. This is considered to be the effect exhibited by the surfactant.
The surfactant may be any of anionic, cationic and nonionic surfactants, but a nonionic surfactant is preferred from the viewpoint of easy dispersion in the hydrophilic coating layer.
Examples of the nonionic surfactant include ethylenediamine polyoxypropylene-polyoxyethylene condensates (ethylenedioxy polyoxypropylene-polyoxyethylene condensates), polyoxyethylene sorbitan monolaurates (polyoxyethylene sorbitan monolaurates), polyoxyethylene polyoxypropylene block polymers (polyoxyethylene polyoxypropylene block polymers), and polyoxyethylene sorbitan monostearate (polyoxyethylene sorbitan monostearate).
The hydrophilic coating layer can be formed by applying a coating composition containing a hydrophilic resin onto a corrosion-resistant coating layer formed thereon, and curing the coating composition by drying, baking, or the like. When the icing/frosting prevention coating layer is formed on the corrosion-resistant coating layer, the icing/frosting prevention coating layer is coated on the corrosion-resistant coating layer and is cured by drying, baking and the like.
The amount of the hydrophilic coating is preferably 0.01g/m from the viewpoint of obtaining sufficient hydrophilicity 2 Above, more preferably 0.1g/m 2 Above, more preferably 0.2g/m 2 The above. When the surface of the fin material is wetted with water, the amount of the hydrophilic coating layer is preferably 5g/m from the viewpoint of preventing the hydrophilic resin from dissolving out and inhibiting the effect of the lubricating coating layer 2 Hereinafter, it is more preferably 3g/m 2 Hereinafter, more preferably 1g/m 2 The following.
The hydrophilic coating layer may contain other optional components in addition to the hydrophilic resin and the surfactant within a range not impairing the effects of the present invention. Examples of the optional component include various aqueous solvents and paint additives for improving coatability, workability, physical properties of the coating layer, and the like.
Examples of the paint additives include water-soluble organic solvents, crosslinking agents, surface modifiers, wetting and dispersing agents, anti-settling agents, antioxidants, antifoaming agents, rust inhibitors, antibacterial agents, and antifungal agents. These coating additives may include one kind or two or more kinds.
The thickness of the hydrophilic coating layer is not particularly limited, and the density of the hydrophilic coating layer is assumed to be 1g/cm 3 From the viewpoint of obtaining good hydrophilicity, the thickness is preferably 0.05 μm or more, more preferably 0.1 μm or more, and still more preferably 0.2 μm or more. From the viewpoint of obtaining good coating workability in forming the hydrophilic coating layer, it is preferably 5 μm or less, more preferably 3 μm or less, and still more preferably 1 μm or less.
The thickness of the hydrophilic coating layer can be adjusted by, for example, selecting the concentration of the coating composition used for forming the hydrophilic coating layer and the bar coater no.
In addition, when the fin material further includes a hydrophilic coating layer and a lubricating coating layer in addition to the icing/frosting prevention coating layer, the total film thickness is preferably 5 μm or less from the viewpoint of suppressing a decrease in heat exchange efficiency of the fin material.
(lubricating coating layer)
The lubricating coating layer is a layer for improving the lubricity of the surface of the fin material to obtain good workability, and contains a conventionally known resin for improving the lubricity. This reduces the friction coefficient of the surface of the fin material, thereby increasing the lubricity and improving the press formability and the like when the fin material is processed into a fin.
The resin having improved lubricity is, for example, a resin having a hydrophilic group. Examples of the hydrophilic group include a hydroxyl group (hydroxyl group), a carboxyl group, a sulfonic acid group, and a polyether group.
Examples of the resin having a hydroxyl group include polyethylene glycol (PEG) and polyvinyl alcohol (PVA). Examples of the resin having a carboxyl group include polyacrylic acid (PAA). Examples of the resin having a hydroxyl group and a carboxyl group include carboxymethyl cellulose (CMC). Examples of the resin having a sulfonic acid group include sulfoethyl acrylate. Examples of the resin having a polyether group include polyethylene glycol (PEG) and modified compounds thereof. In addition, a copolymer of two or more monomers having a hydrophilic group can also be applied.
The lubricating coating layer may contain other optional components in addition to the above components within a range not impairing the effects of the present invention. Examples of the optional component include various aqueous solvents and paint additives for improving the coatability, workability, physical properties of the coating layer, and the like.
Examples of the paint additive include a water-soluble organic solvent, a crosslinking agent, a surfactant, a surface modifier, a wetting dispersant, an anti-settling agent, an antioxidant, an antifoaming agent, an antifouling agent, an antirust agent, an antibacterial agent, and an antifungal agent. These coating additives may include one kind or two or more kinds.
The lubricating coating layer can be formed by applying a coating composition containing a resin having a hydroxyl group, which improves lubricity, to a hydrophilic coating layer, and then curing the coating composition by drying, baking, or the like. In addition, when there is no hydrophilic coating layer or when an icing/frosting inhibition coating layer is formed on the hydrophilic coating layer, a lubricating coating layer is formed on the layer directly below or on the icing/frosting inhibition coating layer.
The amount of the lubricating coating layer is preferably 0.05g/m from the viewpoint of obtaining sufficient lubricity 2 Above, more preferably 0.1g/m 2 Above, more preferably 0.2g/m 2 The above. On the other hand, when the surface of the fin material is wetted with water, the amount of the coating film is preferably 5g/m from the viewpoint of suppressing a decrease in the heat exchange efficiency of the fin 2 Hereinafter, it is more preferably 3g/m 2 Hereinafter, more preferably 1g/m 2 The following.
The thickness of the lubricating coating layer is not particularly limited, but from the viewpoint of obtaining good lubricity, the density of the coating layer is assumed to be 1g/cm 3 It is preferably 0.05 μm or more, more preferably 0.1 μm or more, and still more preferably 0.2 μm or more. From the viewpoint of obtaining good coating workability in the formation of the coating layer, it is preferably 5 μm or less, more preferably 3 μm or less, and still more preferably 1 μm or less.
The thickness of the lubricating coating layer can be adjusted by the concentration of the coating composition used for forming the lubricating coating layer, the selection of the bar coater No. and the like.
(substrate treatment layer)
Optionally, a base treatment layer can be provided on the aluminum plate.
By having a base treatment layer, the corrosion resistance of the aluminum plate can be improved, and when the aluminum plate further has a corrosion-resistant coating layer, the adhesion between the aluminum plate and the corrosion-resistant coating layer can be improved.
The base treatment layer may be any layer that provides corrosion resistance to the aluminum plate, and any conventionally known layer may be used. For example, a layer composed of an inorganic oxide or an inorganic-organic composite compound can be used.
As the inorganic material constituting the inorganic oxide or the inorganic-organic composite compound, chromium (Cr), zirconium (Zr), or titanium (Ti) is preferable as the main component.
The layer made of an inorganic oxide as the base treatment layer can be formed, for example, by subjecting an aluminum plate to a chromate treatment, a zirconium phosphate treatment, a zirconium oxide treatment, a chromate treatment, a zinc phosphate treatment, a titanyl phosphate treatment, or the like. However, the kind of the inorganic oxide is not limited to those formed by these treatments.
The layer composed of an inorganic-organic composite compound as the base treatment layer can be formed, for example, by subjecting an aluminum plate to a coating chromate treatment, a coating zirconium treatment, or the like. Specific examples of such an inorganic-organic composite compound include, for example, an acrylic acid-zirconium composite.
The thickness of the primer layer is not particularly limited and may be suitably set, but the amount of deposit per unit area is preferably 1 to 100mg/m in terms of metal (Cr, zr, ti) 2 The film thickness is preferably 1 to 100nm.
The deposition amount and the film thickness of the base process layer can be adjusted by adjusting the concentration of the chemical conversion treatment liquid used for forming the base process layer and the film formation treatment time.
Before the formation of the foundation treatment layer, the surface of the aluminum plate may be pre-degreased with an alkaline degreasing solution, thereby improving the reactivity of the foundation treatment and improving the adhesion of the formed foundation treatment layer.
(characteristics of aluminum Fin)
Even when dew condensation water adheres to the surface of the aluminum fin material of the present embodiment, ice nucleation can be suppressed by the interaction of the dew condensation water with the icing/frosting suppressing coating layer. As a result, the freezing of the dew condensation water is delayed, and the freezing and frosting of the surface of the fin material can be appropriately suppressed.
A copper plate having a refrigerant flow channel, a Peltier (Peltier) element and an air flow channel is disposed on the inner upper portion of an acrylic tube, and the apparatus is disposed in an environment of 10 ℃ and 55% relative humidity. The copper plate is provided with a fin material at a position in contact with the air inside the cylinder. Then, air was blown into the tube at a wind speed of 1.5 m/sec.
After the above-mentioned step, the copper plate was cooled while continuing blowing air into the cylinder at the same wind speed so that the surface temperature reached-7.5 ℃ and the surface of the fin material was intentionally allowed to adhere with dew condensation water.
A digital microscope is arranged on one side of the fin material with the dew condensation water, and the conditions of the dew condensation water and frost on the surface of the fin material are observed. The time from the start of cooling to the start of frost formation was measured and taken as "icing frost delay time" to evaluate the icing frost suppression effect.
The icing and frosting delay time in the above method is preferably 10 minutes or more, more preferably 12 minutes or more, further preferably 20 minutes or more, and further preferably 30 minutes or more.
Hydrophilicity is also an important parameter after the use of the fin material in a heat exchanger. Therefore, the hydrophilicity of the fin material when the fin material has a hydrophilic coating layer or when the hydrophilicity is improved by adding a crosslinking agent to the icing/frost-formation-suppressing coating layer can be evaluated from the contact angle when pure water is dropped onto the surface of the fin material.
Specifically, about 2 μ L of pure water was dropped onto the surface of the fin material at room temperature, and the contact angle of the droplet (pure water) was measured using a contact angle measuring instrument. The contact angle of the liquid droplet (pure water) is preferably 50 ° or less, more preferably 30 ° or less. The lower limit is not particularly limited, but is usually 5 ° or more.
Method for producing aluminum fin material
An example of the method for producing the aluminum fin material according to the present embodiment is described, but the method is not limited to this embodiment, and the aluminum fin material can be produced by other production methods as long as the effects of the present embodiment are not impaired.
In addition, the following example describes a case where a base treatment layer, a corrosion-resistant coating layer, a hydrophilic coating layer, an icing-frost suppressing coating layer, and a lubricating coating layer are formed on the surface of an aluminum plate in this order, but the base treatment layer, the corrosion-resistant coating layer, the hydrophilic coating layer, and the lubricating coating layer are not necessarily formed, and may be formed arbitrarily. The position where the icing/frost formation-suppressing coating layer is formed is not limited to the position between the hydrophilic coating layer and the lubricating coating layer, and may be formed at any position.
A base treatment layer was formed on the surface of the aluminum plate by a known method. After a corrosion-resistant coating layer is formed on the surface thereof by a known method, a coating composition containing a hydrophilic resin is applied, dried and baked to form a hydrophilic coating layer.
Then, a coating composition containing an amphoteric polyacrylamide resin is applied to the hydrophilic coating layer, and the coating composition is dried and baked to form an icing/frosting inhibition coating layer.
The coating composition containing the amphoteric polyacrylamide resin may contain other components such as a crosslinking agent, a surfactant, and an inorganic material. By containing the crosslinking agent and the inorganic material, not only the effect of suppressing the formation of ice and frost but also more excellent hydrophilicity can be achieved. Further, by containing the surfactant, even when the fin material further has a lubricating coating layer, the workability of the lubricating coating layer can be made to better match the icing/frosting inhibiting property and the hydrophilicity.
The solvent of the coating composition containing the amphoteric polyacrylic resin is not particularly limited, and examples thereof include water, alcohols, and aliphatic ketones. Among them, water or alcohol is preferable, and butanol, ethanol, and the like are preferable as the alcohol.
One solvent may be used or two or more solvents may be used in combination, and for example, when the solvent is a mixed solvent of water and alcohol, the alcohol is preferably 1 to 20 parts by mass per 100 parts by mass of water, from the viewpoint of coatability to the substrate.
The solid content concentration in the coating composition containing the amphoteric polyacrylic resin is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and still more preferably 5.0% by mass or more, from the viewpoint of coatability to a substrate. The solid content concentration is preferably 20% by mass or less, more preferably 15% by mass or less, and still more preferably 10% by mass or less, from the viewpoint of coatability to a substrate.
The film thickness when the coating composition containing the amphoteric polyacrylic resin is applied is preferably 1 μm or more, more preferably 5 μm or more, from the viewpoint of coatability to a substrate. From the viewpoint of the volatility of the solvent, the film thickness is preferably 40 μm or less, and more preferably 20 μm or less. The film thickness here is a film thickness before drying, and can be adjusted by, for example, selecting a bar coater No. when the coating composition is applied by using a bar coater.
Next, a coating composition containing, for example, a resin having a hydrophilic group is applied to the surface of the icing/frost-formation inhibiting coating layer, and the coating composition is dried and baked to form a lubricating coating layer.
The coating of the corrosion-resistant coating layer, the hydrophilic coating layer, the icing/frosting suppressing coating layer, and the lubricating coating layer can be performed by bar coating, roll coating, or the like. In particular, if the aluminum sheet is in the form of a coil, degreasing, coating, heating, winding, and the like are continuously performed using a roll coater or the like, which is preferable in terms of productivity. The baking temperatures of the corrosion-resistant coating layer, the hydrophilic coating layer, the icing/frosting suppressing coating layer, and the lubricating coating layer may be set according to the components of the resin or the like used, and are preferably in the range of 120 to 270 ℃.
Examples
The present invention will be described more specifically below with reference to examples and comparative examples, but the present invention is not limited to these examples, and can be modified and practiced within a range that can meet the spirit thereof, and all of these are included in the technical scope of the present invention.
(example 1)
As the aluminum plate, a plate having a thickness of 0.1mm, JIS H4000: 2014, alloy No. 1070, wherein a phosphate chromate treatment is performed as a base treatment layer on an aluminum plate.
Next, a coating composition containing an amphoteric polyacrylamide resin A-1 (T-MP 183, available from Astro PMC Co., ltd.) was prepared using water as a solvent, and the resulting coating composition was applied to the surface of an aluminum plate having a base treatment layer by using a bar coater. And then drying and baking the aluminum foil to form an icing and frosting inhibition coating layer to obtain the aluminum fin material. The coating amount of the icing/frosting inhibiting coating layer is 0.29g/m 2 。
(example 2)
The amount of the coating other than the icing/frosting inhibiting coating layer was 0.02g/m 2 Except for this, an aluminum fin material was obtained in the same manner as in example 1.
(examples 3 to 9)
An aluminum fin material was obtained in the same manner as in example 1 except that the coating amounts of the amphoteric polyacrylamide-based resin for the ice/frost formation-suppressing coating layer and the ice/frost formation-suppressing coating layer were changed as shown in table 2.
The amphoteric polyacrylamide resins A-1 to A-8 in Table 2 are shown in Table 1.
(example 10)
An aluminum fin material was obtained in the same manner as in example 1 except that colloidal silica (Snowtex (registered trademark) PS-S, manufactured by nippon chemical) was added as an inorganic material in addition to the amphoteric polyacrylamide resin a-1 to the ice/frost formation inhibiting coating layer, and the coating amount of the ice/frost formation inhibiting coating layer was changed as shown in table 2. As described in "solid content weight ratio" in table 2, the solid content ratio of the inorganic material was 25 parts by mass with respect to 100 parts by mass of the amphoteric polyacrylamide resin a-1.
(example 11)
A corrosion-resistant coating layer is formed between the aluminum plate and the icing/frosting prevention coating layer, and the total coating amount of the icing/frosting prevention coating layer and the corrosion-resistant coating layer is 1.54g/m 2 Except for this, an aluminum fin material was obtained in the same manner as in example 1. The corrosion-resistant coating layer is formed by coating a coating composition of a modified polyurethane resin on an aluminum plate, drying and baking.
Comparative example 1
An aluminum fin material was obtained in the same manner as in example 1, except that the coating amounts of the amphoteric polyacrylamide-based resin for the ice/frost formation-suppressing coating layer and the ice/frost formation-suppressing coating layer were as shown in table 2.
Comparative example 2
An aluminum fin sheet was obtained in the same manner as in comparative example 1, except that glyoxal was added as an aldehyde compound in addition to the amphoteric polyacrylamide resin a-8, and the coating amount of the icing frost-formation-suppressing coating layer was changed as shown in table 2. As shown in "solid content weight ratio" in Table 2, the solid content ratio of the aldehyde compound was 200 parts by mass with respect to 100 parts by mass of the amphoteric polyacrylamide resin A-8.
Comparative example 3
An aluminum fin material was obtained in the same manner as in example 1, except that the amphoteric polyacrylamide-based resin was not used as the icing/frost formation-inhibiting coating layer, and sodium silicate was used as the inorganic material.
[ TABLE 1]
TABLE 1
(D Anion(s) /D Amides of carboxylic acids )
For the ice-formation and frost-formation inhibiting coating layer of the aluminum fin material, an infrared absorption spectrum was measured using an infrared spectrophotometer (manufactured by ThermoFisher scientific, nicoret iS50 FT-IR). The measurement was carried out by ATR method (ThermoFisher)Is50 build-in Diamond ATR Module, manufactured by Scientific Co., ltd.) was used, and the number of times was counted as the measurement conditions: 36 times, frequency decomposition: 4. measurement area: 4000cm －1 ～400cm －1 And a detector: DGTS KBr. The value is determined to be 1730 to 1710cm －1 Observed peak intensity D corresponding to the anionic group of amphoteric polyacrylamide resin Anion(s) And at 1660-1640 cm －1 Observed peak intensity D corresponding to the amide group of the amphoteric polyacrylamide resin Amides of carboxylic acids Ratio D of Anion(s) /D Amides of carboxylic acids . The results are shown in table 2.
(evaluation: ice formation and frost formation inhibitory Properties)
A copper plate having a refrigerant flow channel, a Peltier element and an air flow channel was disposed on the inner upper portion of the acrylic cylinder, and the apparatus was disposed in an environment of 10 ℃ and 55% relative humidity. The copper plate is provided with a fin material at a position in contact with the air inside the cylinder. Then, air was blown into the tube at a wind speed of 1.5 m/sec.
After the above-mentioned step, the copper plate was cooled while continuing blowing air into the cylinder at the same wind speed so that the surface temperature reached-7.5 ℃ and the surface of the fin material was intentionally allowed to adhere with dew condensation water.
A digital microscope is arranged on one side of the fin material with the dew condensation water, and the conditions of the dew condensation water and frost on the surface of the fin material are observed. The time from the start of cooling to the start of frost formation was measured and taken as "icing frost delay time" to evaluate the icing frost suppression effect.
The evaluation criteria are as follows, and the results are shown in "icing frost formation inhibitory properties" in table 2.
Preferably (acceptable): the icing and frosting delay time is more than 30 minutes
B excellent (acceptable): the delay time of icing and frosting is more than 20 minutes and less than 30 minutes
C very good (acceptable): the icing and frosting delay time is more than 12 minutes and less than 20 minutes
D good (acceptable): the icing and frosting delay time is more than 10 minutes and less than 12 minutes
E bad (fail): the delay time of icing and frosting is less than 10 minutes
(evaluation: hydrophilicity)
About 2. Mu.L of pure water was dropped onto the surface of an aluminum fin material at room temperature, and the contact angle of the liquid droplet (pure water) was measured using a contact angle measuring instrument (CA-05 model, manufactured by Kyowa Kagaku Co., ltd.). The evaluation criteria are as follows, and the results are shown in "contact angle" of table 2.
A was very good (acceptable): the contact angle is below 30 DEG
B good (acceptable): the contact angle is higher than 30 DEG and below 50 DEG
C bad (failed): contact angle higher than 50 °
[ TABLE 2]
From the above results, it is found that formation of ice and frost can be effectively suppressed by forming an ice and frost formation-suppressing skin layer containing a specific amphoteric polyacrylamide-based resin. At 1730-1710 cm －1 The peak intensity D corresponding to the anionic group of the amphoteric polyacrylamide resin was observed Anion(s) And at 1660-1640 cm －1 The peak intensity D corresponding to the amide group of the amphoteric polyacrylamide resin was observed Amides of carboxylic acids Ratio D of Anion(s) /D Amides of carboxylic acids In comparative example 1 of 0.33, the effect of the present invention was not confirmed.
Further, the icing frost formation delay time is preferably 10 minutes or more, more preferably 30 minutes or more, and as a result, for example, as in example 1, example 4, example 7, and example 9, 60 minutes, 39 minutes, 74 minutes, and 47 minutes, the time considered to be the best icing frost formation suppression property is further significantly improved.
The above effects are not impaired even when an inorganic material is added to the icing/frosting inhibiting coating layer or a corrosion-resistant coating layer is provided. Specifically, in example 10 in which an inorganic material was added, the icing/frosting delay time was 74 minutes, and in addition to achieving better hydrophilicity, better results were achieved with respect to the icing/frosting suppression performance. In example 11 in which the corrosion-resistant coating layer was provided, the icing/frosting delay time was 61 minutes, and it was confirmed that the icing/frosting inhibition property was not lost.
Claims (6)
1. An aluminum fin material comprising an aluminum plate and a coating layer formed on the surface of the aluminum plate, wherein the coating layer comprises an ice/frost formation-suppressing coating layer comprising an amphoteric polyacrylamide-based resin,
the infrared absorption spectrum of the amphoteric polyacrylamide resin obtained by ATR method using infrared spectrophotometer is 1730-1710 cm －1 The peak intensity D observed corresponding to the anionic group of the amphoteric polyacrylamide resin Anion(s) And at 1660-1640 cm －1 The peak intensity D corresponding to the amide group of the amphoteric polyacrylamide resin was observed Amides of carboxylic acids Ratio D of Anion(s) /D Amides of carboxylic acids Is 0.30 or less.
2. The aluminum fin sheet according to claim 1, wherein the ice-formation frost-formation-suppressing coating layer further contains an inorganic material.
3. The aluminum fin sheet according to claim 2, wherein the inorganic material is a silicon-containing compound.
4. The aluminum fin material according to any one of claims 1 to 3, wherein the icing/frost inhibiting coating layer further contains a crosslinking agent.
5. The aluminum fin material according to any one of claims 1 to 3, wherein the coating layer further has at least one selected from the group consisting of a corrosion-resistant coating layer, a hydrophilic coating layer, and a lubricating coating layer.
6. The aluminum fin material according to any one of claims 1 to 3, further comprising a base treatment layer between the aluminum sheet and the membrane layer.
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| JP2009257628A (en) * | 2008-04-14 | 2009-11-05 | Kobe Steel Ltd | Aluminum fin material for heat exchanger |
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| JP2011245477A (en) * | 2010-04-27 | 2011-12-08 | Furukawa-Sky Aluminum Corp | Aluminum coating material and method for manufacturing the same |
| JP2012241073A (en) * | 2011-05-18 | 2012-12-10 | Kansai Paint Co Ltd | Frost formation-restraining treatment composition for heat exchanger fin material |
| JP2014199155A (en) * | 2013-03-29 | 2014-10-23 | 株式会社神戸製鋼所 | Aluminum fin material and process of manufacture thereof |
| WO2020022213A1 (en) * | 2018-07-24 | 2020-01-30 | 株式会社Uacj | Pre-coated aluminum material |
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| JP2009257628A (en) * | 2008-04-14 | 2009-11-05 | Kobe Steel Ltd | Aluminum fin material for heat exchanger |
| CN102200409A (en) * | 2010-03-26 | 2011-09-28 | 株式会社神户制钢所 | Aluminum fin material for heat exchanger |
| JP2011208813A (en) * | 2010-03-26 | 2011-10-20 | Kobe Steel Ltd | Aluminum fin material for heat exchanger |
| JP2011245477A (en) * | 2010-04-27 | 2011-12-08 | Furukawa-Sky Aluminum Corp | Aluminum coating material and method for manufacturing the same |
| JP2012241073A (en) * | 2011-05-18 | 2012-12-10 | Kansai Paint Co Ltd | Frost formation-restraining treatment composition for heat exchanger fin material |
| JP2014199155A (en) * | 2013-03-29 | 2014-10-23 | 株式会社神戸製鋼所 | Aluminum fin material and process of manufacture thereof |
| WO2020022213A1 (en) * | 2018-07-24 | 2020-01-30 | 株式会社Uacj | Pre-coated aluminum material |
| CN112262041A (en) * | 2018-07-24 | 2021-01-22 | 株式会社Uacj | Precoating aluminum material |
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