JP2014210428A - Coated metal plate - Google Patents
Coated metal plate Download PDFInfo
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- JP2014210428A JP2014210428A JP2014075566A JP2014075566A JP2014210428A JP 2014210428 A JP2014210428 A JP 2014210428A JP 2014075566 A JP2014075566 A JP 2014075566A JP 2014075566 A JP2014075566 A JP 2014075566A JP 2014210428 A JP2014210428 A JP 2014210428A
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- coating film
- aluminum
- metal plate
- pigment
- coated metal
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 154
- 239000002184 metal Substances 0.000 title claims abstract description 154
- 238000000576 coating method Methods 0.000 claims abstract description 245
- 239000011248 coating agent Substances 0.000 claims abstract description 238
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 162
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 140
- 239000000049 pigment Substances 0.000 claims abstract description 121
- 239000000758 substrate Substances 0.000 claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 abstract description 24
- 239000011810 insulating material Substances 0.000 abstract description 7
- 238000011282 treatment Methods 0.000 description 37
- 239000003973 paint Substances 0.000 description 34
- 239000010410 layer Substances 0.000 description 29
- 239000000463 material Substances 0.000 description 27
- 238000000034 method Methods 0.000 description 23
- 239000011230 binding agent Substances 0.000 description 21
- 239000003795 chemical substances by application Substances 0.000 description 21
- 229920005989 resin Polymers 0.000 description 17
- 239000011347 resin Substances 0.000 description 17
- 238000002834 transmittance Methods 0.000 description 17
- 238000012360 testing method Methods 0.000 description 16
- 238000007747 plating Methods 0.000 description 15
- 238000013461 design Methods 0.000 description 14
- 239000000126 substance Substances 0.000 description 14
- 238000002310 reflectometry Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000009413 insulation Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 11
- 238000011156 evaluation Methods 0.000 description 8
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000004606 Fillers/Extenders Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- -1 aluminum-manganese Chemical compound 0.000 description 4
- 239000003431 cross linking reagent Substances 0.000 description 4
- 230000001771 impaired effect Effects 0.000 description 4
- 229920001225 polyester resin Polymers 0.000 description 4
- 239000004645 polyester resin Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 229920000877 Melamine resin Polymers 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- FJMNNXLGOUYVHO-UHFFFAOYSA-N aluminum zinc Chemical compound [Al].[Zn] FJMNNXLGOUYVHO-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 229920002125 Sokalan® Polymers 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000010306 acid treatment Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000004584 polyacrylic acid Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 230000003449 preventive effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- GZVHEAJQGPRDLQ-UHFFFAOYSA-N 6-phenyl-1,3,5-triazine-2,4-diamine Chemical compound NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 GZVHEAJQGPRDLQ-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- NRCMAYZCPIVABH-UHFFFAOYSA-N Quinacridone Chemical compound N1C2=CC=CC=C2C(=O)C2=C1C=C1C(=O)C3=CC=CC=C3NC1=C2 NRCMAYZCPIVABH-UHFFFAOYSA-N 0.000 description 1
- 229920006328 Styrofoam Polymers 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 238000007611 bar coating method Methods 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates 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
- 230000031700 light absorption Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000006224 matting agent Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 239000010434 nepheline Substances 0.000 description 1
- 229910052664 nepheline Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 125000002080 perylenyl group Chemical group C1(=CC=C2C=CC=C3C4=CC=CC5=CC=CC(C1=C23)=C45)* 0.000 description 1
- CSHWQDPOILHKBI-UHFFFAOYSA-N peryrene Natural products C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 CSHWQDPOILHKBI-UHFFFAOYSA-N 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 239000011120 plywood Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000008261 styrofoam Substances 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000008096 xylene 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
- 229910052726 zirconium Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Abstract
Description
本発明は、住宅、ビル等の建築物の外装材や、シャッター等に使用できる塗装金属板に関する。 The present invention relates to a coated metal plate that can be used for exterior materials of buildings such as houses and buildings, shutters, and the like.
塗装金属板は、金属材料で構成される基板の表面に塗装を施して形成されるものであり、例えば、建築物の屋根や外壁等の外装材、あるいは、シャッターを形成させるための材料として使用されている。塗装金属板を上記のような外装材やシャッターに使用する場合、日中は太陽光の照射を受けることになる。そのため、塗装金属板により高い遮熱性能や断熱性能を付与することが望まれている。遮熱性能や断熱性能の高い塗装金属板を建物の外装材に使用すれば、太陽光の熱の吸収が抑制され、屋内に熱が伝わるのを防止しやすくできるからである。また、地球温暖化が叫ばれる昨今、太陽光を吸収しやすい建物の外装材などは、いわゆるヒートアイランド現象を助長する一因であるといわれている。しかし、塗装金属板の遮熱性を高めれば、そのようなヒートアイランド現象の発生を防ぎやすくでき、地球温暖化の抑制に対しても貢献し得るものとなる。 A painted metal plate is formed by painting the surface of a substrate made of a metal material. For example, it is used as an exterior material such as a roof or outer wall of a building or a material for forming a shutter. Has been. When a coated metal plate is used for the exterior material and shutter as described above, it receives sunlight during the day. Therefore, it is desired to provide high heat shielding performance and heat insulation performance with a coated metal plate. This is because if a coated metal plate having high heat shielding performance and heat insulation performance is used as a building exterior material, absorption of sunlight heat is suppressed and it is easy to prevent heat from being transmitted indoors. In recent years when global warming is called out, exterior materials for buildings that easily absorb sunlight are said to contribute to the so-called heat island phenomenon. However, if the heat shielding property of the coated metal plate is increased, the occurrence of such a heat island phenomenon can be easily prevented, which can contribute to the suppression of global warming.
例えば、特許文献１には、金属基板の日射面に遮熱性の高い塗料を塗装するようにして、太陽熱の反射率（日射反射率）を高めるようにした塗装金属板が提案されている。また、屋内側の面（上記日射面と反対側の面）に断熱材を貼り合わせて一体化させた塗装金属板や、中空ビーズを配合した塗料で塗膜の厚みを厚くし断熱性能を高める塗装金属板も知られている。 For example, Patent Document 1 proposes a coated metal plate that enhances solar heat reflectance (solar reflectance) by painting a highly heat-shielding paint on the solar radiation surface of a metal substrate. Also, increase the thickness of the paint film by increasing the thickness of the coating with a coating metal plate that is made by integrating a heat insulating material on the indoor surface (the surface opposite to the solar radiation surface) or a paint containing hollow beads. Painted metal plates are also known.
しかし、上記特許文献１のように、遮熱性の高い塗料を塗装する方法だけでは、充分な断熱性能を得ることが難しかった。つまり、日射面の温度上昇は抑制できるが皆無にはならず、日射面から吸収された太陽熱は塗装面と反対側の面からの熱伝導及び放射により室内側に伝達されるため、室内温度上昇を引き起こすからである。熱伝導を抑制するには極端に塗膜厚を大きくする必要があるため、コストが上昇し、外観の低下を引き起こすおそれがあった。一方、中空ビーズを配合した塗料を用いる方法においても、やはりコストが上昇すると共に、満足できる断熱性能を得ることも難しかった。また、屋内側の面に断熱材を貼り合わせる方法でも充分な断熱性能を得ることが難しく、その上、シャッター用途など、開閉の際に磨耗等がある用途においては、断熱材の剥がれが生じるおそれもあり、そのような用途には不向きなものであった。さらに、断熱材を貼り合わせる工程が煩雑なことや、専用設備などに要する初期費用が高いことから、経済性に欠けるという問題もあった。 However, as in Patent Document 1, it is difficult to obtain sufficient heat insulation performance only by a method of applying a paint having high heat shielding properties. In other words, the temperature rise on the solar radiation surface can be suppressed, but it will not be completely eliminated, and the solar heat absorbed from the solar radiation surface is transferred to the indoor side by heat conduction and radiation from the surface opposite to the painted surface, so the indoor temperature rise It is because it causes. In order to suppress heat conduction, it is necessary to extremely increase the thickness of the coating film, which increases the cost and may cause a decrease in appearance. On the other hand, in the method using a paint containing hollow beads, the cost is still increased and it is difficult to obtain satisfactory heat insulation performance. In addition, it is difficult to obtain sufficient heat insulating performance even by a method of attaching a heat insulating material to an indoor side surface, and in addition, there is a risk that the heat insulating material may be peeled off in applications where there is wear when opening and closing, such as shutter applications. Therefore, it was unsuitable for such a use. In addition, the process of attaching the heat insulating material is complicated, and the initial cost required for the dedicated equipment is high, resulting in lack of economic efficiency.
本発明は上記の点に鑑みてなされたものであり、裏面を低放射塗装とすることで、室内側への太陽熱の放射を抑制し、断熱材や断熱コートに頼ることなく室内の温度上昇を抑制することができ、しかも意匠性にも優れる塗装金属板を提供することを目的とするものである。 The present invention has been made in view of the above points, and by reducing the radiation of the solar heat to the indoor side by making the back surface a low radiation coating, the temperature rise in the room without depending on the heat insulating material or the heat insulating coat. An object of the present invention is to provide a coated metal plate that can be suppressed and that has excellent design properties.
本発明に係る塗装金属板は、金属基板に塗装を施した塗装金属板であって、前記金属基板の一方の面に、アルミニウム顔料の含有量が１．５〜１５ｇ／ｍ2、かつ、膜厚が３０μｍ以下である塗膜が形成されていることを特徴とする。 The coated metal plate according to the present invention is a coated metal plate obtained by coating a metal substrate, and an aluminum pigment content is 1.5 to 15 g / m 2 on one surface of the metal substrate, and a film A coating film having a thickness of 30 μm or less is formed.
また、上記の塗装金属板において、前記塗膜が形成されている面の放射率が８０％以下であることが好ましい。 Moreover, in said painted metal plate, it is preferable that the emissivity of the surface in which the said coating film is formed is 80% or less.
また、上記の塗装金属板において、前記塗膜が形成されている面と逆側の面の波長領域７８０〜２５００ｎｍにおける日射反射率（ＲE/NIR）が４０％以上であることが好ましい。 In the coated metal plate, the solar reflectance (R E / NIR ) in the wavelength region 780 to 2500 nm on the surface opposite to the surface on which the coating film is formed is preferably 40% or more.
また、上記の塗装金属板において、前記アルミニウム顔料の形状が鱗片状であることが好ましい。 In the coated metal plate, the shape of the aluminum pigment is preferably scaly.
また、上記の塗装金属板において、前記金属基板が、アルミニウムと亜鉛との合金めっき鋼板であることが好ましい。 Moreover, in the painted metal plate, the metal substrate is preferably an alloy-plated steel plate of aluminum and zinc.
また、上記の塗装金属板において、前記塗膜中のアルミニウム顔料の割合が、４〜３０質量％の範囲内であることが好ましい。 Moreover, in the above-mentioned coated metal plate, the proportion of the aluminum pigment in the coating film is preferably in the range of 4 to 30% by mass.
本発明の塗装金属板によれば、金属基板の一方の面に形成されている塗膜は放射率が低い。そのため、塗装金属板を外装材やシャッター等に使用し、一方の面に形成されている塗膜が室内側を向くように配置させれば、室内側への熱の放射が抑制されるので室内の温度上昇を防止しやすくなる。また、上記塗膜にはアルミニウム顔料が含まれていることでメタリック調の光輝感を有するようになり、これにより高い意匠性が付与される。 According to the coated metal plate of the present invention, the coating film formed on one surface of the metal substrate has a low emissivity. Therefore, if a coated metal plate is used for an exterior material, a shutter, etc., and the coating film formed on one side is arranged so as to face the indoor side, the radiation of heat to the indoor side is suppressed, so the indoor It becomes easy to prevent the temperature rise. Moreover, since the said coating film contains an aluminum pigment, it comes to have a metallic-like luster feeling, and, thereby, high designability is provided.
以下、本発明を実施するための形態を説明する。 Hereinafter, modes for carrying out the present invention will be described.
本発明の塗装金属板は、金属基板の表面及び裏面に塗装が施されて形成されるものであり、塗装金属板の少なくとも一方の面には、アルミニウム顔料を含む塗膜を有している。尚、以下では、「金属基板の表面」又は「塗装金属板の表面」とは、塗装金属板を壁などの外装材や建物のシャッターに使用した場合において、塗装金属板が太陽光を受ける面（日射面）のことをいう。一方、「金属基板の裏面」又は「塗装金属板の裏面」とは、上記日射面に対して反対側の面のことをいう。 The painted metal plate of the present invention is formed by coating the front and back surfaces of a metal substrate, and has a coating film containing an aluminum pigment on at least one surface of the painted metal plate. In the following, “surface of metal substrate” or “surface of painted metal plate” refers to the surface on which the painted metal plate receives sunlight when the painted metal plate is used for exterior materials such as walls or shutters of buildings. (Solar surface). On the other hand, “the back surface of the metal substrate” or “the back surface of the painted metal plate” refers to a surface opposite to the solar radiation surface.
上記金属基板としては、用途に必要な特性を備えた任意の金属製の板材を使用することができ、その種類や化学組成は特に制限されない。このような金属基板として、例えば、低炭素鋼、高炭素鋼、高張力鋼板などに使用される低合金鋼からなる鋼板、ステンレス鋼などで構成される適宜の鋼板、あるいはアルミニウム板等が挙げられる。さらに、上記列挙した板材を母材とし、この両面をめっき層で被覆させためっき鋼板を、金属基板として使用してもよい。金属基板の厚みは、特に制限されず、任意の厚みに形成することができる。 As the metal substrate, any metal plate material having characteristics required for the application can be used, and the type and chemical composition are not particularly limited. Examples of such a metal substrate include a steel plate made of low alloy steel used for low carbon steel, high carbon steel, high tensile steel plate, an appropriate steel plate made of stainless steel, or an aluminum plate. . Furthermore, a plated steel plate in which the above-described listed plate materials are used as a base material and both surfaces thereof are coated with a plating layer may be used as a metal substrate. The thickness in particular of a metal substrate is not restrict | limited, It can form in arbitrary thickness.
上記めっき層の種類は適宜選択することができ、例えば、溶融アルミニウム−亜鉛系、溶融アルミニウム−マンガン系、溶融アルミニウム−ケイ素系、溶融亜鉛、溶融亜鉛−銅系、純アルミニウム等が例示できるが、これらの中でも、溶融アルミニウム−亜鉛系、溶融アルミニウム−マンガン系、溶融アルミニウム−ケイ素系が好ましい。この場合、得られる塗装金属板の日射反射率（ＲE/NIR）を高めやすく、しかも、放射率を低くしやすくなり、塗装金属板の遮熱性を高めることができる。また、上記のようなめっき層の場合、経済的にも有利であるからである。ここで、アルミニウムを含むめっき層である場合は、アルミニウム成分の含有量がめっき層全質量に対して５０質量％以上であることが好適であり、また、純アルミニウムめっきでもよい。このようなめっき層を有して形成された塗装金属板は、太陽熱反射性が高いうえに、基板の防食性や耐食性にも優れるようになる。 The type of the plating layer can be appropriately selected, and examples thereof include molten aluminum-zinc, molten aluminum-manganese, molten aluminum-silicon, molten zinc, molten zinc-copper, and pure aluminum. Among these, a molten aluminum-zinc system, a molten aluminum-manganese system, and a molten aluminum-silicon system are preferable. In this case, it is easy to increase the solar reflectance (R E / NIR ) of the obtained coated metal plate, and it is easy to lower the emissivity, thereby improving the heat shielding property of the painted metal plate. In addition, the plating layer as described above is economically advantageous. Here, in the case of a plating layer containing aluminum, the content of the aluminum component is preferably 50% by mass or more with respect to the total mass of the plating layer, or pure aluminum plating may be used. The coated metal plate formed with such a plating layer has high solar heat reflectivity and is excellent in corrosion resistance and corrosion resistance of the substrate.
上記めっき層の厚みは任意であるが、０．０１μｍ以上の厚さであれば、目的とする日射反射率（ＲE/NIR）や放射率の性能が得られやすい。めっき方法は任意であり、電気めっき法、溶融めっき法、溶融塩電解めっき法、蒸着めっき法など、公知の任意のめっき方法を採用できる。 The thickness of the plating layer is arbitrary, but if the thickness is 0.01 μm or more, the desired solar reflectance (R E / NIR ) and emissivity performance can be easily obtained. The plating method is arbitrary, and any known plating method such as an electroplating method, a hot dipping method, a molten salt electroplating method, or a vapor deposition plating method can be adopted.
上記金属基板の少なくとも一方の面の略全面には、アルミニウム顔料を含む塗膜が形成される。特に、塗装金属板を外装材や建物のシャッター用途に使用する場合、アルミニウム顔料を含む塗膜が、塗装金属板の裏面側に形成されるようにする。以下では、金属基板の裏面側にアルミニウム顔料を含む塗膜が形成されていることを前提に説明する。尚、上記の塗装金属板の裏面側のアルミニウム顔料を含む塗膜を「アルミニウム含有塗膜」ということがある。 A coating film containing an aluminum pigment is formed on substantially the entire surface of at least one surface of the metal substrate. In particular, when the painted metal plate is used for exterior materials or building shutters, a coating film containing an aluminum pigment is formed on the back side of the painted metal plate. Below, it demonstrates on the assumption that the coating film containing an aluminum pigment is formed in the back surface side of a metal substrate. In addition, the coating film containing the aluminum pigment of the back surface side of said coating metal plate may be called "aluminum containing coating film".
アルミニウム含有塗膜に含まれるアルミニウム顔料は粒子状のアルミニウムであるが、この粒子の形状としては、鱗片状、球状、針状、楕円状等が挙げられる。そして、上記塗装金属板にあっては、アルミニウム顔料が鱗片状であることが特に好ましい。この場合、塗装金属板の裏面側における放射率をより低くすることが可能になるからである。例えば、鱗片状のアルミニウム顔料と、これ以外のアルミニウム顔料とを比較した場合、アルミニウム含有塗膜に含まれるアルミニウム顔料の量が同一であれば、鱗片状のアルミニウムの方が、塗装金属板の放射率を低くすることができる。よって、このような塗装金属板を外装材やシャッター用の材料として使用した場合に、室内側への熱の放射を抑制しやすくなる。 The aluminum pigment contained in the aluminum-containing coating film is particulate aluminum, and examples of the shape of the particles include scales, spheres, needles, and ellipses. And in the said coating metal plate, it is especially preferable that an aluminum pigment is scaly. In this case, the emissivity on the back side of the painted metal plate can be further reduced. For example, when a scaly aluminum pigment is compared with other aluminum pigments, if the amount of aluminum pigment contained in the aluminum-containing coating is the same, scaly aluminum is more radiated from the painted metal plate. The rate can be lowered. Therefore, when such a coated metal plate is used as an exterior material or a shutter material, radiation of heat to the indoor side can be easily suppressed.
ここでいう鱗片状とは、平板状や湾曲板状等のように、所定の角度から観察した際（例えば、平面視した際）の面積が、当該観察方向と直交する角度から観察した際の面積よりも大きい形状のことをいう。 As used herein, the scale-like shape refers to a case where the area when observed from a predetermined angle (for example, when viewed in plan) is observed from an angle orthogonal to the observation direction, such as a flat plate shape or a curved plate shape. A shape larger than the area.
アルミニウム顔料の平均粒径は特に限定されず、入手可能であるアルミニウム顔料であれば使用可能であるが、例えば、平均粒径が５〜２０μｍであれば、アルミニウム顔料の分散性が損なわれにくく、かつ、良好な光沢性を有する塗装金属板が得られやすい。 The average particle diameter of the aluminum pigment is not particularly limited and can be used as long as it is an available aluminum pigment. For example, if the average particle diameter is 5 to 20 μm, the dispersibility of the aluminum pigment is hardly impaired, In addition, it is easy to obtain a coated metal plate having good gloss.
アルミニウム含有塗膜には、上記のアルミニウム顔料以外の他、樹脂等の成分で構成され、アルミニウム顔料を保持する役割を果たすバインダーを含む。 In addition to the above aluminum pigment, the aluminum-containing coating film includes a binder that is composed of components such as a resin and plays a role of holding the aluminum pigment.
上記バインダーとしては、例えば、有機樹脂で構成させることができる。このような樹脂としては、アクリル樹脂、ポリエステル樹脂、ポリオレフィン樹脂、フッ素系樹脂、ポリウレタン樹脂、ポリエステルポリウレタン樹脂等の、従来から使用されている各種有機樹脂が挙げられる。バインダーを構成する有機樹脂は、１種単独であってもよいし、２種以上の混合物であっても構わない。このように、バインダーが有機樹脂で構成される場合、アルミニウム含有塗膜に含まれる有機樹脂の含有量は、アルミニウム含有塗膜の全質量に対して１０〜９０質量％の範囲とすることが好ましい。尚、バインダー中には、必要に応じて、合成微粉シリカ、有機ベントナイト、カルボキシメチルセルロース、ポリビニルアルコール等の増粘剤、メラミン系、ベンゾグアナミン系、イソシアネート系等の架橋剤、ポリアクリル酸、ポリアクリル酸塩等の分散剤、防汚用の光触媒等が含有されていてもよい。 As the binder, for example, an organic resin can be used. Examples of such resins include various organic resins conventionally used such as acrylic resins, polyester resins, polyolefin resins, fluorine resins, polyurethane resins, and polyester polyurethane resins. The organic resin constituting the binder may be a single type or a mixture of two or more types. Thus, when a binder is comprised with an organic resin, it is preferable to make content of the organic resin contained in an aluminum containing coating film into the range of 10-90 mass% with respect to the total mass of an aluminum containing coating film. . In addition, in the binder, if necessary, thickeners such as synthetic fine silica, organic bentonite, carboxymethyl cellulose, polyvinyl alcohol, cross-linking agents such as melamine, benzoguanamine, and isocyanate, polyacrylic acid, polyacrylic acid A dispersant such as a salt, a photocatalyst for antifouling, and the like may be contained.
また、本発明の効果を阻害しない程度であれば、アルミニウム含有塗膜中には、上記のアルミニウム顔料以外の顔料、例えば、公知の着色顔料、防錆顔料や体質顔料が含有されていてもよい。具体的には、シリカ、アルミナ、炭酸カルシウム、硫酸バリウム、カオリン、クレー、タルク、ネフェリン、サイナイト、雲母、気泡含有顔料等といった体質顔料が例示される。このような体質顔料がアルミニウム含有塗膜に含まれている場合、バインダーである有機樹脂(例えば、ポリエステル樹脂、フッ素系樹脂など)の基材（金属基板）に対する密着性を高くすることができ、また、アルミニウム含有塗膜自体の凝集強度を高めたり、下地の隠蔽性や明度などが調節できたりもする。 Moreover, as long as the effect of the present invention is not impaired, the aluminum-containing coating film may contain pigments other than the above-mentioned aluminum pigments, for example, known color pigments, rust preventive pigments and extender pigments. . Specific examples include extender pigments such as silica, alumina, calcium carbonate, barium sulfate, kaolin, clay, talc, nepheline, cynite, mica, and bubble-containing pigment. When such an extender pigment is contained in the aluminum-containing coating film, it is possible to increase the adhesiveness to the base material (metal substrate) of the organic resin (for example, polyester resin, fluorine resin, etc.) as a binder, In addition, the cohesive strength of the aluminum-containing coating itself can be increased, and the concealability and brightness of the base can be adjusted.
アルミニウム含有塗膜は、その膜厚が３０μｍ以下で形成される。膜厚が３０μｍを超えると、塗装金属板の放熱性を低くするのが難しくなり、また、意匠性、加工性も悪くなるので好ましくない。アルミニウム含有塗膜の膜厚の好ましい上限値は、２５μｍである。一方、アルミニウム含有塗膜の膜厚の下限は、特に制限されるものではないが、膜厚が小さすぎると、塗膜の損傷や剥がれが生じやすくなって、塗膜としての基本性能を保てなくなってしまうおそれがある。そのため、例えば、膜厚の好ましい範囲は、５〜２５μｍとすればよく、特に好ましくは１２〜１８μｍである。 The aluminum-containing coating film is formed with a film thickness of 30 μm or less. When the film thickness exceeds 30 μm, it is difficult to reduce the heat dissipation of the coated metal plate, and the design and workability are also deteriorated, which is not preferable. The upper limit with a preferable film thickness of an aluminum containing coating film is 25 micrometers. On the other hand, the lower limit of the film thickness of the aluminum-containing coating film is not particularly limited, but if the film thickness is too small, the coating film is likely to be damaged or peeled off, and the basic performance as a coating film can be maintained. There is a risk of disappearing. Therefore, for example, a preferable range of the film thickness may be 5 to 25 μm, and particularly preferably 12 to 18 μm.
特に、アルミニウム顔料が上述の鱗片状である場合、アルミニウム含有塗膜の膜厚が小さくなる程、塗装金属板の放射率を低くすることが可能になる。これは、アルミニウム含有塗膜の薄膜化により、鱗片状のアルミニウム顔料がアルミニウム含有塗膜中で面配向、すなわち、鱗片状のアルミニウム顔料の面どうしが互いに略平行になるように配列していることに起因するためと考えられる。アルミニウム含有塗膜中でアルミニウム顔料が面配向することで、熱の放射を押さえやすくなっていると考えられるからである。 In particular, when the aluminum pigment is scaly, the emissivity of the coated metal plate can be lowered as the film thickness of the aluminum-containing coating film decreases. This is because, by thinning the aluminum-containing coating film, the scaly aluminum pigments are aligned in the plane in the aluminum-containing coating film, that is, the scaly aluminum pigment surfaces are arranged substantially parallel to each other. This is probably because of This is because it is considered that heat radiation is easily suppressed by the plane orientation of the aluminum pigment in the aluminum-containing coating film.
さらに、アルミニウム含有塗膜中のアルミニウム顔料の含有量は、１．５〜１５ｇ／ｍ2である。このアルミニウム顔料の含有量が１．５ｇ／ｍ2より少ないと、塗装金属板の裏面側の放射率を下げることが難しくなる。一方、アルミニウム顔料の含有量が１５ｇ／ｍ2を越えると、アルミニウム顔料が塗膜中で均一に分散することが難しくなり、これにより遮熱金属板の放射率が高くなったり、塗装金属板の加工時にアルミニウム含有塗膜が崩壊したりするという問題も生じる。アルミニウム含有塗膜中における好ましいアルミニウム顔料の含有量の範囲は、１．５〜１２．０ｇ／ｍ2であり、より好ましいアルミニウム顔料の含有量の範囲は、１．５〜１０．０ｇ／ｍ2であり、特に好ましいアルミニウム顔料の含有量の範囲は、１．５〜６．０ｇ／ｍ2である。 Furthermore, content of the aluminum pigment in an aluminum containing coating film is 1.5-15 g / m < 2 >. When the content of the aluminum pigment is less than 1.5 g / m 2, it is difficult to lower the emissivity on the back side of the painted metal plate. On the other hand, when the content of the aluminum pigment exceeds 15 g / m 2 , it becomes difficult for the aluminum pigment to be uniformly dispersed in the coating film, thereby increasing the emissivity of the heat-shielding metal plate, There also arises a problem that the aluminum-containing coating film collapses during processing. The range of the preferable aluminum pigment content in the aluminum-containing coating film is 1.5 to 12.0 g / m 2 , and the more preferable range of the aluminum pigment content is 1.5 to 10.0 g / m 2. The particularly preferable range of the content of the aluminum pigment is 1.5 to 6.0 g / m 2 .
塗装金属板の裏面側に上記アルミニウム含有塗膜が形成されていることで、塗装金属板の裏面の太陽熱の放射率が８０％以下の値を示すようになる。尚、本明細書でいう放射率とは、放射温度計を用いて計測された数値のことをいい、例えば、ＪＩＳ Ａ １４２３に準拠して測定を行うことができる。 By forming the aluminum-containing coating film on the back surface side of the painted metal plate, the solar heat emissivity on the back surface of the painted metal plate shows a value of 80% or less. In addition, the emissivity as used in this specification means the numerical value measured using the radiation thermometer, for example, can be measured based on JISA1423.
アルミニウム含有塗膜中のアルミニウム顔料の割合が、４〜３０質量％の範囲内であることも好ましい。アルミニウム顔料の割合が４質量％以上であることで、塗装金属板の裏面側の放射率を更に下げることができる。一方、アルミニウム顔料の割合が３０質量％以下であることで、アルミニウム顔料が塗膜中で均一に分散しやすくなり、これにより遮熱金属板の放射率が特に低減すると共に、塗装金属板の加工時にアルミニウム含有塗膜が崩壊するような問題が更に生じにくくなる。このアルミニウム顔料の割合は、１０〜３０質量％の範囲内であればより好ましく、１５〜３０質量％の範囲内であれば更に好ましい。 It is also preferable that the ratio of the aluminum pigment in the aluminum-containing coating film is in the range of 4 to 30% by mass. When the proportion of the aluminum pigment is 4% by mass or more, the emissivity on the back side of the coated metal plate can be further lowered. On the other hand, when the proportion of the aluminum pigment is 30% by mass or less, the aluminum pigment can be easily dispersed uniformly in the coating film, thereby reducing the emissivity of the heat-shielding metal plate and processing the painted metal plate. Problems that sometimes cause the aluminum-containing coating to collapse are even less likely to occur. The ratio of the aluminum pigment is more preferably in the range of 10 to 30% by mass, and still more preferably in the range of 15 to 30% by mass.
ここで、塗装金属板を建築用外装材やシャッターとして用いた場合、吸収された太陽熱は、室内空気の対流による伝導と、裏面からの放射により室内に伝達され、室内空気温度を上昇させることが知られている。従って、裏面からの室内への放射を抑制すれば、つまり、裏面の放射率を小さくすれば、室内空気温度の上昇を抑制できるようになる。この点において、上記のように裏面側にアルミニウム含有塗膜を備えた塗装金属板では、放射率が８０％以下の値を示すようになる。そのため、本発明の塗装金属板は、いわゆる低放射塗装が施されたものであり、太陽熱の放射が抑制されるように構成されていることで、塗装金属板を建築用外装材やシャッターとして用いた場合、室温側の温度変化を抑制でき、高い遮熱性能を有するものとなる。 Here, when a coated metal plate is used as an exterior material for a building or a shutter, absorbed solar heat is transmitted to the room by conduction by convection of room air and radiation from the back surface, and the room air temperature can be raised. Are known. Therefore, if the radiation from the back surface to the room is suppressed, that is, if the emissivity of the back surface is reduced, an increase in the indoor air temperature can be suppressed. In this respect, the emissivity of the coated metal plate having the aluminum-containing coating film on the back surface side as described above is 80% or less. Therefore, the coated metal plate of the present invention is so-called low-radiation coating, and is configured to suppress solar radiation, so that the painted metal plate can be used as a building exterior material or a shutter. If this occurs, the temperature change on the room temperature side can be suppressed, and high heat shielding performance can be achieved.
上記放射率は、７０％以下であることがより好ましく、６５％以下であることが特に好ましい。また、上記放射率の下限は特に限定されるものではないが、通常、金属基板そのものの放射率の値が下限となり、例えば、アルミニウム含有塗膜を有しない溶融５５％アルミニウム−亜鉛めっき鋼板（ガルバリウム鋼板（登録商標））であれば約３０％である。 The emissivity is more preferably 70% or less, and particularly preferably 65% or less. Further, the lower limit of the emissivity is not particularly limited, but usually the emissivity value of the metal substrate itself is the lower limit, for example, a molten 55% aluminum-galvanized steel sheet (galvalume) having no aluminum-containing coating film. Steel sheet (registered trademark)) is about 30%.
塗装金属板は裏面側にアルミニウム含有塗膜を有していることで、いわゆるメタリック調の光輝感を有するものとなる。これにより、塗装金属板の裏面に高い意匠性が付与され、塗装金属板の裏面が視認されるような用途（例えば、建物のシャッター等）に用いた場合であっても、外観が損なわれにくい。 The coated metal plate has a so-called metallic-like glitter because it has an aluminum-containing coating film on the back side. Thereby, a high designability is imparted to the back surface of the painted metal plate, and even when used for applications where the back surface of the painted metal plate is visually recognized (for example, a shutter of a building), the appearance is not easily damaged. .
尚、上記説明では、アルミニウム含有塗膜は、塗装金属板の裏面（日射面と逆側の面）に形成されたものを例に説明したが、使用用途に応じて、塗装金属板の日射面側にアルミニウム含有塗膜が形成されたものであってもよい。 In the above description, the aluminum-containing coating film has been described as an example formed on the back surface (the surface opposite to the solar radiation surface) of the painted metal plate, but depending on the intended use, the solar radiation surface of the painted metal plate An aluminum-containing coating film may be formed on the side.
本発明では、金属基板の表面側（アルミニウム含有塗膜の形成面と逆側の面）の略全面にも塗膜が形成されていてもよい。尚、以下では、塗装金属板の表面側に形成される塗膜を「表面塗膜」ということがある。 In this invention, the coating film may be formed also in the substantially whole surface of the surface side (surface on the opposite side to the formation surface of an aluminum containing coating film) of a metal substrate. Hereinafter, the coating film formed on the surface side of the coated metal plate may be referred to as “surface coating film”.
上記表面塗膜は、太陽光の反射性に優れる塗膜を使用することができる。以下、太陽光の反射性に優れる塗膜を「反射性塗膜」ということがある。反射性塗膜としては、太陽熱の反射性に優れる顔料が含まれる塗膜、あるいは太陽熱透過率が高い顔料のみを含む塗膜等が挙げられる。太陽熱透過率が高い顔料のみを含む塗膜が形成されている場合では、元来反射率の高い金属板面で反射した太陽光が当該塗膜を通り抜けて外部に反射されるので、太陽光の反射が促されるようになり、塗装金属板表面が高い反射率を有するものとなる。 As the surface coating film, a coating film having excellent sunlight reflectivity can be used. Hereinafter, a coating film having excellent sunlight reflectivity is sometimes referred to as a “reflective coating film”. Examples of the reflective coating film include a coating film containing a pigment having excellent solar heat reflectivity, or a coating film containing only a pigment having a high solar heat transmittance. In the case where a coating film containing only a pigment having a high solar heat transmittance is formed, the sunlight reflected by the metal plate surface having a high reflectance is reflected outside through the coating film. Reflection is promoted, and the painted metal plate surface has a high reflectance.
上記太陽熱の反射性に優れる顔料（以下、反射性顔料という）としては、近赤外線領域での日射反射率が１０％以上である反射性顔料が好適に採用され得る。反射性顔料の具体例としては、金属の酸化物、硫化物、クロム酸塩などの金属化合物や、不溶性色素（色素顔料）、レーキ顔料等が挙げられ、これらの少なくとも１種を単独使用してもよいし、２種以上を併用してもよい。上記種類の顔料では、塗装金属板に長期間にわたって高い遮熱性能を付与することが可能であり、同時に耐水性や耐候性を高めることができ、しかも、環境や人体に影響を与えにくい利点がある。 As the pigment having excellent solar heat reflectivity (hereinafter referred to as a reflective pigment), a reflective pigment having a solar reflectance of 10% or more in the near-infrared region can be suitably employed. Specific examples of reflective pigments include metal compounds such as metal oxides, sulfides and chromates, insoluble dyes (pigment pigments), lake pigments, etc., and at least one of these can be used alone. Alternatively, two or more kinds may be used in combination. With the above types of pigments, it is possible to provide high heat shielding performance to the coated metal plate over a long period of time, and at the same time, it can improve water resistance and weather resistance, and has the advantage that it does not easily affect the environment and the human body. is there.
反射性塗膜に含まれる反射性顔料の含有量は、反射性塗膜の全質量に対して２〜７０質量％とすることができる。反射性顔料が反射性塗膜の全質量に対して２質量％以上であれば、塗装金属板に優れた太陽熱反射性を付与することができ、また着色力も高くなるので、意匠性に優れた塗装金属板が形成される。また、反射性顔料が反射性塗膜の全質量に対して７０質量％以下であれば、塗装金属板を加工しにくくなるおそれが小さくなり、加工性の良い塗装金属板が形成される。反射性塗膜に含まれる反射性顔料の含有量は、反射性塗膜の全質量に対して５〜６０質量％であることが特に好ましい。 Content of the reflective pigment contained in a reflective coating film can be 2-70 mass% with respect to the total mass of a reflective coating film. When the reflective pigment is 2% by mass or more with respect to the total mass of the reflective coating film, it is possible to impart excellent solar heat reflectivity to the coated metal plate, and the coloring power is increased, so that the design property is excellent. A painted metal plate is formed. Moreover, if a reflective pigment is 70 mass% or less with respect to the total mass of a reflective coating film, a possibility that it will become difficult to process a coating metal plate becomes small, and a coating metal plate with favorable workability will be formed. As for content of the reflective pigment contained in a reflective coating film, it is especially preferable that it is 5-60 mass% with respect to the total mass of a reflective coating film.
反射性顔料の平均粒径は５０μｍ以下であることが好ましく、この場合、塗装金属板に高い太陽熱反射性を付与することが可能になる。より好ましい平均粒径は２０μｍ以下、さらに好ましい平均粒径は１０μｍ以下であり、これらの場合、塗装金属板の耐汚染性、耐候性、色安定性も優れるものとなる。 The average particle diameter of the reflective pigment is preferably 50 μm or less, and in this case, high solar heat reflectivity can be imparted to the coated metal plate. A more preferable average particle diameter is 20 μm or less, and a further preferable average particle diameter is 10 μm or less. In these cases, the stain resistance, weather resistance, and color stability of the coated metal plate are also excellent.
反射性塗膜は、上記アルミニウム含有塗膜同様、バインダーと、その他必要に応じて添加されている反射性顔料以外の顔料などで構成される。このようなバインダーは、上述したようなアルミニウム含有塗膜で使用され得る材料と同様の材料を適用できる。 The reflective coating film is composed of a binder and other pigments other than the reflective pigment added as necessary, like the aluminum-containing coating film. As such a binder, the same material as that which can be used in the aluminum-containing coating film as described above can be applied.
反射性顔料以外の顔料として、上記アルミニウム含有塗膜同様、公知の着色顔料、防錆顔料や体質顔料が含有されていてもよく、この場合、反射性塗膜に所望の色彩や隠蔽性、耐食性等の性能を付与することができる。このような顔料は、上述したようなアルミニウム含有塗膜で使用され得る顔料と同様の顔料を適用することができる。 As a pigment other than the reflective pigment, a known color pigment, a rust preventive pigment or an extender pigment may be contained in the same manner as the above-mentioned aluminum-containing coating. In this case, the reflective coating has a desired color, concealment and corrosion resistance. Etc. can be provided. As such a pigment, a pigment similar to the pigment that can be used in the aluminum-containing coating film as described above can be applied.
反射性塗膜の膜厚は、３〜２００μｍであることが好ましい。この場合、反射性塗膜の膜厚の下限値が３μｍであれば、色相が安定しやすくなり、外観の良好な意匠性の塗装金属板が形成される。より好ましい反射性塗膜の膜厚の下限値は７μｍである。一方、反射性塗膜の膜厚の上限値が２００μｍであれば、塗装金属板の加工時に、表面塗膜の剥離や割れが生じるおそれはなく、また、塗膜の形成も容易に行える。より好ましい反射性塗膜の膜厚の上限値は５０μｍ以下である。 The thickness of the reflective coating film is preferably 3 to 200 μm. In this case, if the lower limit of the film thickness of the reflective coating film is 3 μm, the hue is likely to be stable, and a design-coated metal plate having a good appearance is formed. A more preferable lower limit of the thickness of the reflective coating film is 7 μm. On the other hand, when the upper limit value of the thickness of the reflective coating film is 200 μm, there is no possibility that the surface coating film is peeled off or cracked during the processing of the coated metal plate, and the coating film can be easily formed. A more preferable upper limit value of the thickness of the reflective coating film is 50 μm or less.
尚、反射性塗膜には、任意の成分を添加させることで、所望の意匠性を付与することができる。例えば、反射性塗膜に、上述の鱗片状等のアルミニウム顔料が含まれている場合は、塗装金属板の表面をメタリック調に形成することができる。また、反射性塗膜に艶消し剤が含まれている場合は、塗装金属板の表面の艶消しが可能になる。 In addition, desired design property can be provided to a reflective coating film by adding arbitrary components. For example, when the reflective coating film contains the above-described scaly aluminum pigment, the surface of the coated metal plate can be formed in a metallic tone. Moreover, when the matting agent is contained in the reflective coating film, the surface of the coated metal plate can be matted.
表面塗膜が複数の塗膜層で形成されている場合は、上記反射性塗膜は最外層の塗膜、すなわち、外層塗膜とすることが好ましく、この場合、反射性塗膜による効果が損なわれるおそれはない。尚、ここでいう外層塗膜とは、塗装金属板の色彩を決定する塗装工程で施される塗膜のことを意味する。そのため、耐汚染性などの性能向上を目的として、外層塗膜の上にさらにクリアー皮膜を施す場合もあるが、ここでは当該クリアー皮膜は外層塗膜とは考えない。 When the surface coating is formed of a plurality of coating layers, the reflective coating is preferably the outermost coating, that is, the outer coating, and in this case, the effect of the reflective coating is effective. There is no risk of damage. In addition, an outer-layer coating film here means the coating film given by the coating process which determines the color of a coating metal plate. Therefore, in order to improve performance such as contamination resistance, a clear film may be further applied on the outer layer coating film, but here the clear coating is not considered to be an outer layer coating film.
上記のように表面塗膜が複数の塗膜を備える場合であって、反射性塗膜を外装塗膜とした場合、その下層の塗膜（以下、「内装塗膜」という）は、反射性塗膜と同様、反射性顔料が含有されていてもよいし、反射性顔料が含有されていなくてもよい。すなわち、外層塗膜だけを反射性塗膜としてもよいし、内層塗膜の一部または全部も反射性塗膜としてもよい。もちろん、内装塗膜には反射性顔料以外の顔料が含まれていてもよい。また、内装塗膜中のバインダー樹脂やその他添加剤は、公知の材料を使用することができ、外装塗膜（反射性塗膜）と同様の構成でもよい。 When the surface coating film includes a plurality of coating films as described above, and the reflective coating film is used as an exterior coating film, the lower layer coating film (hereinafter referred to as “interior coating film”) is reflective. Similar to the coating film, a reflective pigment may be contained, or a reflective pigment may not be contained. That is, only the outer layer coating film may be a reflective coating film, or a part or all of the inner layer coating film may be a reflective coating film. Of course, the interior coating film may contain a pigment other than the reflective pigment. Moreover, a well-known material can be used for binder resin and other additives in an interior coating film, and the structure similar to an exterior coating film (reflective coating film) may be sufficient.
内層塗膜（例えば、いわゆる下塗り塗膜や中塗り塗膜）に、反射性顔料が含有されていても、含有量が２％に満たない場合は、太陽熱反射性を阻害しないように、内層塗膜の膜厚を２００μｍ以下とすればよい。より好ましい内層塗膜の膜厚は５０μｍ以下である。 Even if the inner layer coating film (for example, so-called undercoating film or intermediate coating film) contains a reflective pigment, if the content is less than 2%, the inner layer coating should not be disturbed. The film thickness may be 200 μm or less. The film thickness of the more preferable inner layer coating film is 50 μm or less.
表面塗膜は、波長領域７８０〜２５００ｎｍにおける日射反射率が４０％以上であることが好ましく、４５％以上であることが特に好ましい。上記日射反射率が４０％以上であれば、塗装金属板の表面の太陽熱の反射性を高めやすくなり、高い遮熱性能を有する塗装金属板が形成され得る。尚、上記でいう日射反射率とは、ＪＩＳ Ｋ５６０２の規定に準拠して測定された値をいう。 The surface coating film preferably has a solar reflectance in the wavelength region of 780 to 2500 nm of 40% or more, and particularly preferably 45% or more. If the solar reflectance is 40% or more, it becomes easy to improve the solar heat reflectivity of the surface of the coated metal plate, and a coated metal plate having high heat shielding performance can be formed. In addition, the solar reflectance mentioned above means the value measured based on prescription | regulation of JISK5602.
一方、表面塗膜が、太陽熱の反射性に優れる顔料を含まず、太陽熱透過率が高い顔料のみを含む塗膜である場合、この塗膜の７８０〜２５００ｎｍの波長領域での太陽熱透過率が２０％以上となるように塗膜を形成させればよい。２０％以上の太陽熱透過率を確保するための塗膜構成は、基本的には上述の太陽光の反射性に優れる顔料が含まれる塗膜と同様でよい。ただし、顔料については、上記反射性顔料について列挙したような種類の顔料の中でも、特に、近赤外線領域での光の吸収率が低く、透過率が高い顔料を使用するようにすればよい。このような顔料の例としては、例えば、ペリレン系顔料、キナクリドン系顔料、フタロシアニン系顔料等が例示される。顔料の平均粒径は、塗膜の太陽熱透過率が低下しないように、２０μｍ以下の範囲にすることが好ましく、また、塗膜厚みは１〜１００μｍの範囲とすることが好ましい。バインダーとして用いる有機樹脂や塗膜に存在させる添加物は、塗膜の近赤外線領域での太陽熱透過率を阻害しないように選択することが好ましい。この場合、反射性顔料を含んだ塗膜であったとしても、顔料の種類や粒径、塗膜厚み、その他の条件を適当に選択することで、太陽熱透過率を２０％以上とすることができる。そして、上記のように構成される太陽熱透過率が２０％以上である塗膜が形成されている場合は、塗装金属板表面の７８０〜２５００ｎｍの波長領域での日射反射率（ＲE/NIR）が４０％以上と高いものとなる。そのため、基板から反射した太陽熱が塗膜を通り抜けて外部に反射されるので、塗装金属板に高い太陽熱反射性が付与される。特に、金属基板に形成されているめっき層のアルミニウム成分の含有量が５０質量％以上の場合は、当該めっき層の太陽熱反射率が高いことから、高い日射反射率（ＲE/NIR）を有する塗装金属板が得られる。 On the other hand, when the surface coating film does not contain a pigment having excellent solar heat reflectivity and contains only a pigment having a high solar heat transmittance, the solar heat transmittance in the wavelength region of 780 to 2500 nm of this coating film is 20 What is necessary is just to form a coating film so that it may become more than%. The coating film configuration for ensuring a solar heat transmittance of 20% or more may be basically the same as that of the coating film containing the above-described pigment having excellent sunlight reflectivity. However, as for the pigment, among the types of pigments listed for the reflective pigment, a pigment having a low light absorption in the near infrared region and a high transmittance may be used. Examples of such pigments include perylene pigments, quinacridone pigments, phthalocyanine pigments, and the like. The average particle diameter of the pigment is preferably in the range of 20 μm or less, and the thickness of the coating film is preferably in the range of 1 to 100 μm so that the solar heat transmittance of the coating film does not decrease. It is preferable to select the organic resin used as the binder and the additive present in the coating film so as not to inhibit the solar heat transmittance in the near infrared region of the coating film. In this case, even if the coating film includes a reflective pigment, the solar heat transmittance may be 20% or more by appropriately selecting the pigment type, particle size, coating film thickness, and other conditions. it can. And when the coating film which the solar heat transmittance comprised as mentioned above is 20% or more is formed, the solar radiation reflectance (R E / NIR ) in the wavelength range of 780-2500 nm of the coating metal plate surface Is as high as 40% or more. Therefore, since the solar heat reflected from the substrate passes through the coating film and is reflected to the outside, high solar heat reflectivity is imparted to the coated metal plate. In particular, when the content of the aluminum component of the plating layer formed on the metal substrate is 50% by mass or more, the solar heat reflectance of the plating layer is high, and thus the solar radiation reflectance (R E / NIR ) is high. A painted metal plate is obtained.
上記のように日射反射率（ＲE/NIR）及び太陽熱透過率の波長領域をそれぞれ、近赤外線領域である７８０〜２５００ｎｍと規定したのは、可視光線領域の波長に対する日射反射率（ＲE/NIR）や太陽熱透過率は色彩に依存して決まるためである。可視光線領域の波長に対しても日射反射率（ＲE/NIR）や太陽熱透過率を規定すると、塗装金属板の色彩の自由度がなくなり、建築用外装材として不適格となりやすい。しかし、上述のように、近赤外線領域の波長に対して日射反射率（ＲE/NIR）や太陽熱透過率を所定の範囲に規定すれば、日射を受けた場合の金属基板の温度上昇が抑制され、遮熱性能を高めやすくなる。 Was as described above in the solar reflectance (R E / NIR) and wavelength regions of solar transmittance, respectively, defined as a near-infrared region 780~2500nm is solar reflectance for wavelengths in the visible light region (R E / This is because NIR ) and solar heat transmittance are determined depending on the color. If the solar reflectance (R E / NIR ) and solar heat transmittance are specified even for wavelengths in the visible light region, the degree of color freedom of the painted metal plate is lost, and it tends to be ineligible as a building exterior material. However, as described above, if the solar reflectance (R E / NIR ) and solar heat transmittance are defined within a predetermined range for wavelengths in the near infrared region, the temperature rise of the metal substrate when exposed to solar radiation is suppressed. It is easy to improve the heat shielding performance.
また、表面塗膜に表面を疎水化処理するなどして、耐汚染性を付与してもよい。耐汚染性を付与する方法は、特に限定されず、公知の方法によって行うことができる。例えば、表面に現れる外層の反射性塗膜のバインダー用の樹脂を親水性または疎水性の樹脂にして、この塗膜の水に対する接触角を例えば６０°以下または９０°以上にする方法を採用することができる。あるいは、別途、水に対する接触角が適切な範囲の塗膜を形成させてもよい。上記のように耐汚染性を付与することで、塗装金属板表面に汚染物質が付着するのを抑制することができるので、太陽熱の反射性の低下も起こりにくくすることができる。 Further, the surface coating film may be imparted with stain resistance by, for example, subjecting the surface to a hydrophobic treatment. The method for imparting stain resistance is not particularly limited, and can be performed by a known method. For example, a method is adopted in which the resin for binder of the reflective coating of the outer layer appearing on the surface is made hydrophilic or hydrophobic, and the contact angle of this coating with water is, for example, 60 ° or less or 90 ° or more. be able to. Alternatively, a coating film having an appropriate contact angle with water may be formed. By imparting stain resistance as described above, it is possible to prevent the contaminants from adhering to the surface of the coated metal plate, and thus it is possible to prevent the solar heat reflectivity from being lowered.
金属基板には、上記の内層塗膜（例、下塗り、中塗り）以外に、塗布型、反応型等のクロメート処理皮膜や、リン酸塩処理皮膜など、公知の塗装前処理皮膜により化成処理層を形成してもよい。この場合、塗装金属板の耐食性、塗膜密着性などの長期耐久性を向上するようになる。尚、化成処理層は、太陽熱反射性を損なわず、また、放射率を増大させない程度に形成させればよい。 In addition to the above-mentioned inner layer coating film (eg, undercoat, intermediate coating), the metal substrate is subjected to a chemical conversion treatment layer by a known coating pretreatment film such as a coating type or reactive type chromate treatment film or a phosphate treatment film. May be formed. In this case, long-term durability such as corrosion resistance and coating film adhesion of the coated metal plate is improved. In addition, what is necessary is just to form a chemical conversion treatment layer to such an extent that solar heat reflectivity is not impaired and emissivity is not increased.
化成処理層を形成するための処理剤（化成処理剤）としては、例えばクロメート処理剤、３価クロム酸処理剤、樹脂を含有するクロメート処理剤、３価クロム酸処理剤などのクロムを含有する処理剤；リン酸亜鉛処理剤、リン酸鉄処理剤などのリン酸系の処理剤；コバルト、ニッケル、タングステン、ジルコニウムなどの金属酸化物を単独であるいは複合して含有する酸化物処理剤；腐食を防止するインヒビター成分を含有する処理剤；バインダー成分（有機、無機、有機―無機複合など）とインヒビター成分を複合した処理剤；インヒビター成分と金属酸化物とを複合した処理剤；バインダー成分とシリカやチタニア、ジルコニアなどのゾルとを複合した処理剤；前記例示した処理剤の成分をさらに複合した処理剤などが挙げられる。上記のような各種処理剤は、公知の配合成分で構成されたものを使用することができる。 Examples of the treatment agent (chemical conversion treatment agent) for forming the chemical conversion treatment layer include chromium such as a chromate treatment agent, a trivalent chromic acid treatment agent, a chromate treatment agent containing a resin, and a trivalent chromic acid treatment agent. Treatment agents; Phosphate treatment agents such as zinc phosphate treatment agents and iron phosphate treatment agents; Oxide treatment agents containing metal oxides such as cobalt, nickel, tungsten, zirconium alone or in combination; Corrosion Treatment agent containing an inhibitor component for preventing oxidization; treatment agent in which a binder component (organic, inorganic, organic-inorganic composite, etc.) and inhibitor component are combined; treatment agent in which an inhibitor component and metal oxide are combined; binder component and silica And a treatment agent in which a sol such as titania or zirconia is combined; a treatment agent in which the components of the exemplified treatment agents are further combined. As the above-mentioned various treatment agents, those composed of known blending components can be used.
化成処理層は、化成処理剤を用い、ロールコート法、スプレー法、浸漬法、電解処理法、エアーナイフ法など公知の方法で形成され得る。化成処理剤の塗布後、必要に応じ、更に常温放置や、熱風炉や電気炉、誘導加熱炉などの加熱装置による乾燥や焼付けなどの工程が追加されてもよい。赤外線類、紫外線類や電子線類などエネルギー線による硬化方法が適用されてもよい。乾燥時の温度や乾燥時間は、使用した化成処理剤の種類や、求められる生産性などに応じて適宜決定される。このようにして形成される化成処理層は、めっき層上で、連続状もしくは非連続状の皮膜となる。化成処理層の厚みは、処理の種類、求められる性能などに応じて、適宜決定される。 The chemical conversion treatment layer may be formed by a known method such as a roll coating method, a spray method, a dipping method, an electrolytic treatment method, or an air knife method using a chemical conversion treatment agent. After application of the chemical conversion treatment agent, a step such as standing at room temperature or drying or baking with a heating device such as a hot air furnace, an electric furnace, or an induction heating furnace may be added as necessary. A curing method using energy rays such as infrared rays, ultraviolet rays and electron beams may be applied. The temperature and drying time during drying are appropriately determined according to the type of chemical conversion treatment agent used and the required productivity. The chemical conversion treatment layer thus formed becomes a continuous or discontinuous film on the plating layer. The thickness of the chemical conversion treatment layer is appropriately determined according to the type of treatment, required performance, and the like.
前記化成処理層の付着量は、表面に塗布される塗料の密着性や、遮熱塗装金属板の加工性がより向上するという点で、クロメート処理皮膜であれば金属クロム換算で２００ｍｇ／ｍ2以下、より好ましくは１００ｍｇ／ｍ2以下とするのがよい。また、リン酸塩処理皮膜の場合の付着量は、上記同様の理由により、５．０ｇ／ｍ2以下、より好ましくは３．０ｇ／ｍ2以下とするのがよい。 The adhesion amount of the chemical conversion treatment layer is 200 mg / m 2 in terms of metal chromium in the case of a chromate treatment film in that the adhesion of the paint applied to the surface and the workability of the heat-shielding coating metal plate are further improved. In the following, it is more preferable to set it to 100 mg / m 2 or less. Moreover, the adhesion amount in the case of a phosphating film is 5.0 g / m 2 or less, more preferably 3.0 g / m 2 or less, for the same reason as described above.
また、塗膜の密着性をより向上させるには、前処理皮膜の付着量を、クロメート処理の場合は５ｍｇ／ｍ2以上、より好ましくは２０ｍｇ／ｍ2以上とするのがよく、リン酸塩処理の場合は０．２ｇ／ｍ2以上、より好ましくは０．５ｇ／ｍ2以上とするのがよい。 Further, in order to further improve the adhesion of the coating film, the amount of the pretreatment film to be deposited should be 5 mg / m 2 or more in the case of chromate treatment, more preferably 20 mg / m 2 or more. In the case of treatment, it is preferably 0.2 g / m 2 or more, more preferably 0.5 g / m 2 or more.
尚、金属基板がステンレス鋼板またはアルミニウム板である場合も、塗膜との密着性を高めるために公知のクロメート処理を施してもよく、その場合は上記の範囲の付着量とすればよい。 In addition, also when a metal substrate is a stainless steel plate or an aluminum plate, in order to improve adhesiveness with a coating film, you may give a well-known chromate process, and what is necessary is just to set it as the adhesion amount of said range.
塗装金属板を製造するにあたっては、特に方法は限定されず、公知の方法で行うことができる。例えば、上述したアルミニウム顔料とバインダーを含有する塗料を調製し、この塗料を金属基板の裏面に塗布して乾燥させ、必要であれば熱硬化させて、アルミニウム含有塗膜を裏面に有する塗装金属板を製造することができる。また、塗装金属板の表面側に、反射性塗膜を形成させる場合は、上記同様、反射性顔料とバインダーを含有する塗料を調製し、この塗料により金属基板の表面に反射性塗膜を形成させればよい。 In producing the coated metal plate, the method is not particularly limited and can be carried out by a known method. For example, a coated metal plate having a coating film containing an aluminum pigment and a binder prepared as described above, coated on the back surface of the metal substrate, dried, and if necessary, heat-cured, and having an aluminum-containing coating film on the back surface. Can be manufactured. When a reflective coating is to be formed on the surface side of a painted metal plate, a coating containing a reflective pigment and a binder is prepared as described above, and a reflective coating is formed on the surface of the metal substrate using this coating. You can do it.
上記塗料に用いる溶媒については特に限定はなく、バインダー用の樹脂に合わせて、慣用の溶剤から適宜選択して用いればよい。このような溶剤としては、水、トルエン、キシレン、シクロヘキサノン、メチルエチルケトン等が例示されるが、これらに限られるものではない。バインダー用樹脂は、溶媒に溶解していても、或いはエマルジョン樹脂のように溶媒に分散ないし懸濁しているものでもよい。塗料には、その他必要な原料、例えば、アルミニウム顔料、反射性顔料、体質顔料、架橋剤、分散剤、安定剤等を配合させることができる。 The solvent used in the paint is not particularly limited, and may be appropriately selected from conventional solvents according to the binder resin. Examples of such solvents include, but are not limited to, water, toluene, xylene, cyclohexanone, methyl ethyl ketone, and the like. The binder resin may be dissolved in a solvent, or may be dispersed or suspended in a solvent like an emulsion resin. Other necessary raw materials such as aluminum pigments, reflective pigments, extender pigments, crosslinking agents, dispersants, stabilizers and the like can be blended in the paint.
ここで、アルミニウム含有塗膜を形成させるための塗料（以下、アルミニウム含有塗料」という）において、アルミニウム顔料は当該塗料全質量に対して４〜３０ｗｔ％であることが好ましい。さらに、このアルミニウム含有塗料を金属基板の裏面側に塗布するにあたっては、その塗布量を５０ｇ／ｍ2以下とすることが好ましい。このようなアルミニウム顔料の含有量の塗料を上記塗布量で塗布するようにすれば、アルミニウム含有塗膜中のアルミニウム顔料の含有量や、当該塗膜の膜厚が上記した範囲となり、塗装金属板裏面側の放射率を低くすることが可能になる。そのため、塗装金属板は、遮熱性に優れるものとなる。 Here, in a paint for forming an aluminum-containing coating film (hereinafter referred to as “aluminum-containing paint”), the aluminum pigment is preferably 4 to 30 wt% with respect to the total mass of the paint. Furthermore, when this aluminum-containing paint is applied to the back side of the metal substrate, the coating amount is preferably 50 g / m 2 or less. If the coating material having such an aluminum pigment content is applied at the above coating amount, the content of the aluminum pigment in the aluminum-containing coating film and the film thickness of the coating film are within the above-described ranges, and the coated metal plate The emissivity on the back side can be lowered. Therefore, the coated metal plate has excellent heat shielding properties.
アルミニウム含有塗料等の塗料の金属基板への塗装方法は公知の方法で行えばよく、例えば、スプレーコート、ロールコート、カーテンフローコート、バーコート等の方法が適用できる。塗料の塗装後は、熱風オーブン、誘導加熱オーブン等の公知の手法で乾燥および冷却すればよい。これらの処理は、公知の塗装設備を用いて施すことができる。 A coating method of a paint such as an aluminum-containing paint on a metal substrate may be performed by a known method. For example, a spray coating method, a roll coating method, a curtain flow coating method, a bar coating method, or the like can be applied. After coating the paint, it may be dried and cooled by a known method such as a hot air oven or an induction heating oven. These treatments can be performed using known coating equipment.
金属基板に塗料を塗布する前に、前述したように、塗装前処理、すなわち、内装塗膜（下塗り、中塗り）を適宜施してもよく、あるいはその一部または全部を省略してもよい。内装塗膜を形成させる場合も、所定の塗料を調製し、この塗料から塗膜を形成させるようにすればよい。 Before applying the paint to the metal substrate, as described above, a pre-coating treatment, that is, an interior coating film (undercoating or intermediate coating) may be appropriately applied, or a part or all thereof may be omitted. In the case of forming an interior coating film, a predetermined coating material may be prepared and a coating film may be formed from this coating material.
以下、本発明を実施例によって具体的に説明する。 Hereinafter, the present invention will be specifically described by way of examples.
（実施例１）
めっき層被覆金属板（金属基板）として板厚０．３０ｍｍの溶融５５％アルミニウム−亜鉛めっき鋼板（ガルバリウム鋼板（登録商標）、以下「ＧＬ板」と表記）を用意した。このＧＬ板を脱脂し、化成処理した後、ポリエステル系塗料を塗布し、これを焼付乾燥することにより、所定膜厚の下塗り塗膜を形成した（下塗りあり）。この後、上記ＧＬ板の表面及び裏面に以下に説明する塗料を塗装することで、表面に反射性塗膜、裏面にアルミニウム含有塗膜を形成させるようにした。
Example 1
As the plating layer-coated metal plate (metal substrate), a molten 55% aluminum-zinc plated steel plate (galvalume steel plate (registered trademark), hereinafter referred to as “GL plate”) having a thickness of 0.30 mm was prepared. This GL board was degreased and subjected to chemical conversion treatment, and then a polyester-based paint was applied, and this was baked and dried to form an undercoat film having a predetermined thickness (with undercoat). Then, the coating material demonstrated below was applied to the surface and back surface of the said GL board, and the reflective coating film was formed in the surface, and the aluminum containing coating film was formed in the back surface.
反射性塗膜を形成させるための塗料は、低赤外線吸収性の顔料を４０質量部、バインダーとしてポリエステル樹脂を６０質量部、メラミン系架橋剤１０質量部を配合し、溶剤として適量のシクロヘキサノンを加え、ボールミルを用いて分散混合することで調製した。この塗料を、乾燥膜厚で２０μｍになるようにロールコート法で塗布し、２４０℃で６０秒間焼き付けて、表面（日射面）側の塗膜（反射性塗膜）を形成した。この反射性塗膜は、高遮熱性の塗膜（茶色）である。 The paint for forming the reflective coating film is composed of 40 parts by mass of a low-infrared absorbing pigment, 60 parts by mass of a polyester resin as a binder, and 10 parts by mass of a melamine crosslinking agent, and an appropriate amount of cyclohexanone is added as a solvent. The mixture was dispersed and mixed using a ball mill. This paint was applied by a roll coating method so as to have a dry film thickness of 20 μm, and baked at 240 ° C. for 60 seconds to form a coating film (reflective coating film) on the surface (solar surface) side. This reflective coating film is a highly heat-shielding coating film (brown).
一方、アルミニウム含有塗膜を形成させるための塗料は、顔料として鱗片状アルミニウム粉０７００Ｍ（東洋アルミニウム社製、平均粒径８μｍ）を１７質量部、バインダーとしてポリエステル樹脂１００質量部、メラミン系架橋剤１０質量部を配合し、溶剤として適量のシクロヘキサノンを加え、ボールミルを用いて分散混合することで調製した。この場合の塗料中の鱗片状アルミニウム粉の割合は約９．１６質量％である。
On the other hand, the coating material for forming the aluminum-containing coating film is 17 parts by mass of scaly aluminum powder 0700M (manufactured by Toyo Aluminum Co., Ltd., average particle size 8 μm) as a pigment, 100 parts by mass of a polyester resin as a binder, and melamine-based
上記のように調製した塗料をＧＬ板の裏面に、ロールコート法により鱗片状アルミニウム粉（アルミニウム顔料）の含有量が２．５ｇ／ｍ2となるように塗布した。この場合の塗布量は１４μｍである。塗布後、２４０℃で６０秒間焼き付けて、裏面側のメタリック色の塗膜（アルミニウム含有塗膜）を形成することで、塗装金属板を得た。 The coating material prepared as described above was applied to the back surface of the GL plate by a roll coating method so that the content of scaly aluminum powder (aluminum pigment) was 2.5 g / m 2 . The coating amount in this case is 14 μm. After coating, baking was performed at 240 ° C. for 60 seconds to form a metallic-colored coating film (aluminum-containing coating film) on the back side, thereby obtaining a coated metal plate.
（実施例２）
アルミニウム含有塗膜を形成させるための塗料中の鱗片状アルミニウム粉の割合を３．８３質量％に変更し、ＧＬ板に、鱗片状アルミニウム粉（アルミニウム顔料）の含有量が１．６ｇ／ｍ2になるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Example 2)
The ratio of the scaly aluminum powder in the coating material for forming the aluminum-containing coating film was changed to 3.83% by mass, and the content of the scaly aluminum powder (aluminum pigment) in the GL plate was 1.6 g / m 2. A coated metal plate was obtained in the same manner as in Example 1 except that the aluminum-containing coating film was formed so as to be.
（実施例３〜６）
アルミニウム含有塗膜を形成させるための塗料中の鱗片状アルミニウム粉の割合を２．５５質量％に変更し、ＧＬ板に、鱗片状アルミニウム粉（アルミニウム顔料）の含有量が表１に示す値になるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Examples 3 to 6)
The ratio of the flaky aluminum powder in the paint for forming the aluminum-containing coating film was changed to 2.55% by mass, and the content of the flaky aluminum powder (aluminum pigment) was changed to the value shown in Table 1 on the GL plate. A coated metal plate was obtained in the same manner as in Example 1 except that an aluminum-containing coating film was formed.
（実施例７〜１０）
アルミニウム含有塗膜を形成させるための塗料中の鱗片状アルミニウム粉の割合を３．８３質量％に変更し、ＧＬ板に、鱗片状アルミニウム粉（アルミニウム顔料）の含有量が表１に示す値になるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Examples 7 to 10)
The ratio of the scale-like aluminum powder in the paint for forming the aluminum-containing coating film was changed to 3.83% by mass, and the content of the scale-like aluminum powder (aluminum pigment) was changed to the value shown in Table 1 on the GL plate. A coated metal plate was obtained in the same manner as in Example 1 except that an aluminum-containing coating film was formed.
（実施例１１〜１４）
アルミニウム含有塗膜を形成させるための塗料中の鱗片状アルミニウム粉の割合を５．７５質量％に変更し、ＧＬ板に、鱗片状アルミニウム粉（アルミニウム顔料）の含有量が表１に示す値になるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Examples 11-14)
The ratio of the scale-like aluminum powder in the paint for forming the aluminum-containing coating film was changed to 5.75% by mass, and the content of the scale-like aluminum powder (aluminum pigment) was changed to the value shown in Table 1 on the GL plate. A coated metal plate was obtained in the same manner as in Example 1 except that an aluminum-containing coating film was formed.
（実施例１５）
アルミニウム含有塗膜を形成させるための塗料中の鱗片状アルミニウム粉の種類を、６６ＮＬ-Ｂ（旭化成ケミカルズ社製、平均粒径１５μｍ）に変更し、塗料中の鱗片状アルミニウム粉の割合を１８質量％に変更し、ＧＬ板に、鱗片状アルミニウム粉（アルミニウム顔料）の含有量が４．７ｇ／ｍ2になるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Example 15)
The type of scaly aluminum powder in the paint for forming the aluminum-containing coating was changed to 66NL-B (Asahi Kasei Chemicals Corporation, average particle size 15 μm), and the proportion of scaly aluminum powder in the paint was 18 mass. %, And an aluminum-containing coating film was formed on the GL plate so that the content of scaly aluminum powder (aluminum pigment) was 4.7 g / m 2. A painted metal plate was obtained by the method described above.
（実施例１６）
アルミニウム含有塗膜を形成させるための塗料中の鱗片状アルミニウム粉の種類を、１１００Ｍ（東洋アルミ社製、平均粒径３３μｍ）に変更し、ＧＬ板に、鱗片状アルミニウム粉（アルミニウム顔料）の含有量が２．４ｇ／ｍ2になるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Example 16)
The type of scaly aluminum powder in the paint for forming the aluminum-containing coating film was changed to 1100M (manufactured by Toyo Aluminum Co., Ltd., average particle size 33 μm), and the GL plate contained scaly aluminum powder (aluminum pigment) A coated metal plate was obtained in the same manner as in Example 1 except that the aluminum-containing coating film was formed so that the amount was 2.4 g / m 2 .
（実施例１７）
反射性塗膜を形成させるための塗料の顔料を、近赤外領域の反射率が高い遮熱顔料に変更したこと以外は、実施例１と同様の方法で塗装金属板を得た。この場合の反射性塗膜は、実施例１の高遮熱性の塗膜の遮熱性よりは低いが、中程度の遮熱性の塗膜（茶色）となる。
(Example 17)
A coated metal plate was obtained in the same manner as in Example 1 except that the pigment of the paint for forming the reflective coating film was changed to a heat shielding pigment having a high reflectance in the near infrared region. In this case, the reflective coating film is lower than the heat-shielding property of the highly heat-shielding coating film of Example 1, but becomes a moderate heat-shielding coating film (brown).
（実施例１８）
反射性塗膜を形成させるための塗料の顔料を、近赤外領域を吸収しやすいカーボンブラックに変更したこと以外は、実施例１と同様の方法で塗装金属板を得た。この場合の塗膜は、非遮熱性の塗膜（茶色）である。
(Example 18)
A coated metal plate was obtained in the same manner as in Example 1 except that the pigment of the paint for forming the reflective coating film was changed to carbon black that easily absorbs the near infrared region. The coating film in this case is a non-heat-shielding coating film (brown).
（実施例１９〜２４）
アルミニウム含有塗膜を形成させるための塗料中のバインダを、フッ素系樹脂に変更し、この塗料中の鱗片状アルミニウム粉の割合、及び塗膜中の鱗片状アルミニウム粉（アルミニウム顔料）の含有量が表１に示す値になるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Examples 19 to 24)
The binder in the paint for forming the aluminum-containing coating film is changed to a fluororesin, and the ratio of the flaky aluminum powder in this paint and the content of the flaky aluminum powder (aluminum pigment) in the coating film A coated metal plate was obtained in the same manner as in Example 1 except that the aluminum-containing coating film was formed to have the values shown in Table 1.
（比較例１）
塗料中の鱗片状アルミニウム粉の割合を０．３８質量％に変更し、ＧＬ板に、鱗片状アルミニウム粉（アルミニウム顔料）の含有量が０．２ｇ／ｍ2となるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Comparative Example 1)
The ratio of the scaly aluminum powder in the paint was changed to 0.38% by mass, and the aluminum-containing coating film was applied to the GL plate so that the content of the scaly aluminum powder (aluminum pigment) was 0.2 g / m 2. A coated metal plate was obtained in the same manner as in Example 1 except that it was formed.
（比較例２，３）
アルミニウム含有塗膜を形成させるための塗料中のバインダを、フッ素系樹脂に変更し、この塗料中の鱗片状アルミニウム粉の割合、及び塗膜中の鱗片状アルミニウム粉（アルミニウム顔料）の含有量が表１に示す値になるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Comparative Examples 2 and 3)
The binder in the paint for forming the aluminum-containing coating film is changed to a fluororesin, and the ratio of the flaky aluminum powder in this paint and the content of the flaky aluminum powder (aluminum pigment) in the coating film A coated metal plate was obtained in the same manner as in Example 1 except that the aluminum-containing coating film was formed to have the values shown in Table 1.
（参考例１）
ＧＬ板の裏面に、アルミニウム含有塗膜を形成させなかったこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Reference Example 1)
A coated metal plate was obtained in the same manner as in Example 1 except that the aluminum-containing coating film was not formed on the back surface of the GL plate.
（参考例２）
塗料中の鱗片状アルミニウム粉の割合を１．９２質量％に変更し、ＧＬ板に、鱗片状アルミニウム粉（アルミニウム顔料）の含有量が１．０ｇ／ｍ2となるようにアルミニウム含有塗膜を形成するようにしたこと以外は、実施例１と同様の方法で塗装金属板を得た。
(Reference Example 2)
The ratio of the scale-like aluminum powder in the paint was changed to 1.92% by mass, and the aluminum-containing coating film was applied to the GL plate so that the content of the scale-like aluminum powder (aluminum pigment) was 1.0 g / m 2. A coated metal plate was obtained in the same manner as in Example 1 except that it was formed.
（塗装金属板の評価）
上記のように得られた各実施例、比較例及び参考例の塗装金属板について、表面側の太陽熱透過率及び日射反射率（ＲE/NIR）、裏面側の放射率を測定した結果を表１に示す。
(Evaluation of painted metal plate)
Table 1 shows the results of measuring the solar heat transmittance and solar reflectance (R E / NIR ) on the front side and the emissivity on the back side of the coated metal plates of the examples, comparative examples and reference examples obtained as described above. It is shown in 1.
さらに、各々の塗装金属板を使用したときの断熱性能評価、並びに塗装金属板の裏面側の意匠性の評価結果もあわせて表１に示す。 Further, Table 1 also shows the heat insulation performance evaluation when each coated metal plate is used, and the design evaluation results on the back side of the painted metal plate.
各測定及び評価方法は以下のとおりである。 Each measurement and evaluation method is as follows.
＜太陽熱透過率の測定＞
測定装置として、分光光度計（島津製作所社製「ＵＶ３６００」）を使用し、単離した塗膜を測定試料とし、７８０〜２５００ｎｍの波長領域で測定した分光透過率から算出した。
<Measurement of solar thermal transmittance>
A spectrophotometer (“UV3600” manufactured by Shimadzu Corporation) was used as a measuring device, and the isolated coating film was used as a measurement sample, and the spectral transmittance measured in the wavelength region of 780 to 2500 nm was calculated.
＜日射反射率の測定＞
測定装置として、島津製作所社製ＵＶ３６００を使用し、ＪＩＳ Ｋ５４０２に記載の日射反射率（ＲE/NIR）の評価方法に準拠して塗装金属板表面の日射反射率（ＲE/NIR）の測定を行った。測定波長領域は７８０〜２５００ｎｍとした。
<Measurement of solar reflectance>
As the measuring apparatus, using a Shimadzu UV3600, measurement of solar reflectance according to JIS K5402 (R E / NIR) solar reflectance of compliance with painted metal plate surface evaluation method of (R E / NIR) Went. The measurement wavelength region was 780 to 2500 nm.
＜放射率の測定＞
放射温度計（ＫＥＹＥＮＣＥ社製「ＩＴ２−８０」）により測定した。
<Measurement of emissivity>
It measured with the radiation thermometer ("IT2-80" by KEYENCE).
＜断熱性能評価＞
幾つかの実施例及び比較例において、上記の塗装金属板から長さ：２４０ｍｍ、幅：１８０ｍｍの試験片３を切り出し、図１に示す測定器１０にてランプ照射実験を行うことにより、室内温度安定性の評価を行った。図１に示す測定器１０は、容器６と、熱電対４、７、８と、記録計５とで構成されている。熱電対４は、容器６の内部の温度を、熱電対７は、試験片の裏面側の温度（裏面板温）を、熱電対８は、試験片の表面側の温度（表面板温）を計測するものである。熱電対４、７、８はいずれも、容器６の外部に設けた記録計５に接続されて試験片表裏温度及び容器６の内部の温度変化を測定できるようになっている。容器６は厚さ１２ｍｍの合板製の箱で、内面側に厚さ１０ｍｍの断熱材（発泡スチロール）を貼り合わせたものである（図示は省略している）。また、上面に開口部を有しており、この開口部に上記試験片３をはめ込んで固定できるようになっている。開口部に上記試験片３をはめ込むと、容器６の開口部が塞がれるようになっている。
<Insulation performance evaluation>
In some examples and comparative examples, the
温度２５℃の環境下の屋外に上記測定器１０を設置し、容器６の開口部に、試験片３の日射面が上側を向くように、すなわち、アルミニウム含有塗膜が形成されている面が容器６の内部側を向くように試験片３をはめ込んで固定させた。このように容器６の開口部に固定した試験片３に、１００Ｗ白熱電球の光を３０分間照射し、照射前後の容器６内部の温度変化を計測して、下記判定基準にて室内温度安定性を評価した。
◎◎：温度変化が２℃未満であり、断熱性能が極めて優れている。
◎ ：温度変化が２℃以上３℃未満であり、断熱性能が下記「○」判定より優れている。
○ ：温度変化が３℃以上４℃未満であり、断熱性能が優れている。
△ ：温度変化が４℃以上６℃未満であり、やや温度上昇が見られるものの、断熱性能は問題ないレベルである。
× ：温度変化が６℃以上であり、断熱性能が非常に悪い。
The measuring
A: The temperature change is less than 2 ° C., and the heat insulation performance is extremely excellent.
A: Temperature change is 2 ° C. or more and less than 3 ° C., and the heat insulation performance is superior to the following “◯” judgment.
○: The temperature change is 3 ° C. or more and less than 4 ° C., and the heat insulation performance is excellent.
(Triangle | delta): Although a temperature change is 4 degreeC or more and less than 6 degreeC and a temperature rise is seen a little, the heat insulation performance is a level which is satisfactory.
X: The temperature change is 6 ° C. or more, and the heat insulation performance is very poor.
尚、上記判定基準においては、「△」であれば断熱性能としては実用上問題ないレベルであるが、判定が「○」であることが好ましく、「◎」又は「◎◎」であることが特に好ましい。 In the above criteria, if “Δ”, the heat insulation performance is at a level that is practically acceptable, but the judgment is preferably “◯”, and “◎” or “◎◎”. Particularly preferred.
＜裏面側の意匠性評価＞
塗装金属板の裏面側の外観を目視で確認し、下記判定基準にて意匠性を評価した。
○：裏面の光沢性に優れ、外観が非常に良好である。
×：裏面の光沢性が悪く、外観の意匠性に乏しい。
<Evaluation of design on the back side>
The appearance on the back side of the coated metal plate was visually confirmed, and the design properties were evaluated according to the following criteria.
○: Excellent glossiness on the back surface and very good appearance.
X: The glossiness of the back surface is poor and the design of the appearance is poor.
表１の結果から試験片の温度は表面塗膜の日射反射率に依存しており、日射反射率の低い非遮熱仕様塗膜を有する試験片では試験片の温度上昇が大きく、日射反射率の高い高遮熱仕様塗膜を有する試験片では温度上昇が小さいことがわかる。そして、試験片の温度が上昇すると、試験片の裏面側から放熱が生じ、容器内温度が上昇する。ここで、裏面側の放射率が一定の場合、試験片の温度が高くなるにつれて裏面からの放熱量も大きくなる。また、裏面からの放熱量は、裏面塗膜の放射率に依存しており、裏面塗膜をアルミニウム含有塗膜とすることで裏面からの放熱が抑制され、容器内の温度変化を小さくできることがわかる。 From the results in Table 1, the temperature of the test piece depends on the solar reflectance of the surface coating film, and the test piece having a non-heat-shielding coating film with low solar reflectance has a large temperature rise of the test piece, and the solar reflectance It can be seen that the temperature rise is small in the test piece having a high high heat shielding specification coating film. And when the temperature of a test piece rises, heat dissipation will arise from the back surface side of a test piece, and the temperature in a container will rise. Here, when the emissivity on the back surface side is constant, the amount of heat released from the back surface increases as the temperature of the test piece increases. In addition, the amount of heat released from the back surface depends on the emissivity of the back surface coating film, and by making the back surface coating film an aluminum-containing coating film, heat dissipation from the back surface can be suppressed and the temperature change in the container can be reduced. Recognize.
実施例１〜２４では、いずれも裏面側に所定量のアルミニウム顔料を含むアルミニウム含有塗膜が形成されていることで、容器内温度上昇が小さく、遮熱性能に優れるものであり、また、裏面側の意匠性も優れるものであった。また、実施例１８では、反射性塗膜が非遮熱性の塗膜であるにもかかわらず、参考例２の高遮熱性の塗膜を形成した塗装金属板と同等の遮熱性能を有していた。従って、実施例１〜２４のように、裏面側に所定量のアルミニウム顔料を含むアルミニウム含有塗膜が形成されていることで、表面側の塗膜の種類によらず（すなわち、反射性塗膜の顔料の種類によらず）、塗装金属板は容器内温度変化を小さくでき、且つ意匠性に優れるものである。よって、このような塗装金属板を使用すれば、室内の温度を安定に保つことができ、また、意匠性も損ないにくくすることができる。 In each of Examples 1 to 24, an aluminum-containing coating film containing a predetermined amount of aluminum pigment is formed on the back side, so that the temperature rise in the container is small and the heat shielding performance is excellent. The side design was also excellent. Moreover, in Example 18, although the reflective coating film is a non-heat-shielding coating film, it has the same heat-shielding performance as the coated metal plate on which the highly heat-shielding coating film of Reference Example 2 was formed. It was. Accordingly, as in Examples 1 to 24, an aluminum-containing coating film containing a predetermined amount of aluminum pigment is formed on the back surface side, so that it does not depend on the type of coating film on the front surface side (that is, a reflective coating film). Regardless of the type of pigment, the coated metal plate can reduce the temperature change in the container and is excellent in design. Therefore, if such a coated metal plate is used, the indoor temperature can be kept stable, and the design can be made difficult to be impaired.
一方、比較例１は、アルミニウム含有塗膜のアルミニウム顔料の含有量が少ないので、容器内温度変化が大きいものであった。比較例２及び３では、アルミニウム含有塗膜の厚みが大きいので、意匠性が悪化した。尚、ＧＬ板の裏面にアルミニウム含有塗膜を有していない参考例１では、室内温度変化が小さいものの、意匠性が悪いので、塗装金属板の裏面が視認されるような用途（例えば、建物のシャッター）には不向きであるといえる。 On the other hand, in Comparative Example 1, since the content of the aluminum pigment in the aluminum-containing coating film was small, the temperature change in the container was large. In Comparative Examples 2 and 3, the design properties deteriorated because the thickness of the aluminum-containing coating film was large. In Reference Example 1 where the back surface of the GL plate does not have an aluminum-containing coating film, the room temperature change is small, but the design is poor, so that the back surface of the painted metal plate is visually recognized (for example, a building) It can be said that it is not suitable for the shutter.
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