WO2011122587A1 - 耐プレッシャーマーク性及び耐擦り疵性に優れたクリヤ塗装ステンレス鋼板 - Google Patents
耐プレッシャーマーク性及び耐擦り疵性に優れたクリヤ塗装ステンレス鋼板 Download PDFInfo
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- WO2011122587A1 WO2011122587A1 PCT/JP2011/057712 JP2011057712W WO2011122587A1 WO 2011122587 A1 WO2011122587 A1 WO 2011122587A1 JP 2011057712 W JP2011057712 W JP 2011057712W WO 2011122587 A1 WO2011122587 A1 WO 2011122587A1
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- resin
- stainless steel
- clear
- resistance
- steel sheet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
- B32B15/082—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 comprising vinyl resins; comprising acrylic resins
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- 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
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
- C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
- C08G18/6225—Polymers of esters of acrylic or methacrylic acid
- C08G18/6229—Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/80—Masked polyisocyanates
- C08G18/8061—Masked polyisocyanates masked with compounds having only one group containing active hydrogen
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- 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
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- 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
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
- Y10T428/24372—Particulate matter
- Y10T428/24405—Polymer or resin [e.g., natural or synthetic rubber, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/254—Polymeric or resinous material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2998—Coated including synthetic resin or polymer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T428/31605—Next to free metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
- Y10T428/31692—Next to addition polymer from unsaturated monomers
Definitions
- the present invention relates to a clear-coated stainless steel sheet excellent in pressure mark resistance and scuff resistance.
- This application claims priority based on Japanese Patent Application No. 2010-077367 filed in Japan on March 30, 2010 and Japanese Patent Application No. 2011-029016 filed in Japan on February 14, 2011. The contents are incorporated here.
- ⁇ Clear-coated stainless steel sheets have a high-grade appearance that takes advantage of the beautiful metallic luster that is unique to stainless steel.
- the clear-coated stainless steel sheet is characterized by a very high surface gloss, and therefore there is a problem that pressure marks generated due to the pressure during winding of the steel sheet and scuffing on the painted surface are easily noticeable.
- Patent Document 2 In addition, it has been reported that in the front and back double-sided coating method of the base material, the pressure-resistant mark is improved by adding resin particles to the backside coating part (Patent Document 2).
- the back surface is often coated to suppress rust.
- the coating on the back surface itself may be restricted.
- it is necessary to perform special coating for the back surface it leads to an extra cost increase.
- Patent Document 4 there is a technique that improves the design of stainless steel clear coating by the process of 1 coat and 1 bake. However, there is no mention of pressure mark resistance during production.
- the present invention has been made in view of such circumstances, and provides a clear-coated stainless steel sheet that is economically superior in mass production conditions with a large coil weight and excellent in pressure mark resistance and scratch resistance. With the goal.
- the inventors have obtained the knowledge that the selection of resin beads and the relationship between the thickness of the clear coating and the average particle size of the resin beads are important, leading to the present invention.
- thermosetting resin composition (A) includes an acrylic resin (A1) and a cross-linked cured resin (A2) made of a blocked isocyanate resin and an amino resin that cross-links and cures the acrylic resin (A1).
- the acrylic resin (A1) contains one or more crosslinkable functional groups selected from a hydroxyl group, a carboxyl group, and an alkoxysilane group, has a glass transition point of 30 to 90 ° C., and a number average molecular weight of 3000 to 50000. It is.
- the average particle size of the resin beads (B) is set to be 0. 0 of the film thickness of the clear-coated film. It may be 20 to 3.0 times.
- the resin beads (B) are cross-linked acrylic resin beads and cross-linked urethane resins. One kind or two or more kinds selected from beads and fluororesin beads may be used.
- the clear-coated film contains a thermosetting resin composition and a predetermined amount of resin beads, and the thermosetting resin composition includes an acrylic resin, As the resin for crosslinking and curing, a blocked isocyanate resin and an amino resin are included. For this reason, the pressure mark resistance and scuff resistance of the clear coated stainless steel sheet can be improved. Moreover, since it is excellent in pressure mark resistance, it can be manufactured under the mass production conditions where the coil unit weight is large, and it is economically superior. Furthermore, according to the clear coated stainless steel sheet according to one aspect of the present invention, by defining the average particle diameter of the resin beads relative to the film thickness of the clear coated film, And scuff resistance can be further improved.
- a clear coating film made of a resin composition for clear coating is applied and formed on one side or both sides of the stainless steel plate.
- the resin composition for clear coating is 0 per 100 parts by mass of the solid content of the thermosetting resin composition (A) including the acrylic resin (A1) and the cross-linked cured resin (A2), and the thermosetting resin composition (A). 0.5 to 4.0 parts by mass of resin beads (B).
- thermosetting resin composition (A) that is the base resin of the clear coating resin composition will be described.
- thermosetting resin composition (A) includes one or more crosslinkable functional groups selected from a hydroxyl group, a carboxyl group, and an alkoxysilane group, has a glass transition point of 30 to 90 ° C., and has a number average molecular weight. It contains at least an acrylic resin (A1) of 3000 to 50000, and a cross-linked cured resin (A2) made of a blocked isocyanate resin and an amino resin that cross-links and cures the acrylic resin.
- Acrylic resin (A1) The acrylic resin (A1) having one or more crosslinkable functional groups selected from a hydroxyl group, a carboxyl group, and an alkoxysilane group in the present embodiment is obtained by a known method as a coating resin.
- the acrylic resin (A1) is obtained by reacting a non-functional monomer with one or more polymerizable monomers having a crosslinkable functional group such as a hydroxyl group, a carboxyl group, or an alkoxysilane group. be able to.
- non-functional monomers include methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, Aliphatic or cyclic acrylates such as n-butyl methacrylate, n-hexyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, lauryl methacrylate; methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, n-butyl Ethers such as vinyl ether; styrenes such as styrene and a-methylstyrene; one or more selected from acrylamide monomers such as acrylamide, N-methylolacrylamide, and diacetoneacrylamide. That.
- polymerizable monomers containing one or more hydroxyl groups in one molecule include hydroxyalkyl esters such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate; Plaxel FM1 -5, FA-1-5 (manufactured by Daicel Chemical Industries) and lactone-modified hydroxyl group-containing vinyl polymerization monomers. Any of the compounds exemplified here is a polymerizable monomer having a polymerizable unsaturated double bond together with a hydroxyl group.
- a polymer monomer having a carboxyl group is a compound containing at least one carboxyl group and one polymerizable unsaturated double bond in one molecule, such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid. An acid etc. are mentioned.
- Examples of the polymer monomer having an alkoxysilane group include vinyltrimethoxysilane, vinyltriethoxysilane, methacryloxypropyltrimethoxysilane, and the like.
- the compounds exemplified here are also compounds each containing one or more alkoxysilane groups and polymerizable unsaturated double bonds in one molecule.
- the acrylic resin (A1) obtained from the above raw materials can have two or more crosslinkable functional groups such as a hydroxyl group, a carboxyl group, and an alkoxysilane group per molecule.
- the number average molecular weight of the acrylic resin (A1) is preferably in the range of 3000 to 50000, more preferably in the range of 4000 to 20000.
- the number average molecular weight is less than 3000, the reactivity with the cross-linking agent is too poor to form a coating film, which is not preferable.
- the number average molecular weight is more than 50000, the solubility in a solvent is insufficient and the resin liquid may not be obtained, which is not preferable.
- the glass transition point of the acrylic resin (A1) is preferably 30 to 90 ° C, and more preferably in the range of 50 to 90 ° C.
- the glass transition point of the acrylic resin (A1) is less than 30 ° C, if the surface temperature of the steel sheet rises to 80-100 ° C due to friction and heat generated during continuous pressing, the coating film softens and is applied to the mold. Since membrane resin may adhere, it is not preferable.
- the glass transition point is higher than 90 ° C., workability during painting such as pinholes and insufficient leveling is deteriorated, which is not preferable.
- the cross-linked cured resin (A2) which is another component of the thermosetting resin composition (A) is a mixture of a blocked isocyanate resin and an amino resin.
- the blocked isocyanate resin is a compound having two or more isocyanate groups in one molecule, and the polyisocyanate is a blocking agent such as phenols, oximes, active methylenes, ⁇ -caprolactams, triazoles and pyrazoles. It has been sealed.
- An organotin catalyst such as dibutyltin dilaurate is used as a dissociation accelerator for the blocking agent.
- polyisocyanate examples include aromatic diisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, xylene diisocyanate and naphthalene diisocyanate; aliphatic diisocyanates such as hexamethylene diisocyanate and dimer acid diisocyanate; alicyclic diisocyanates such as isophorone diisocyanate and cyclohexane diisocyanate; Examples include isocyanate burette-type adducts and isocyanuric ring-type adducts.
- Amino resin is a generic term for resins modified with alcohol by addition reaction of amino compounds (melamine, guanamine, urea) and formaldehyde (formalin).
- amino resins for paint include melamine resin, benzoguanamine resin, urea resin, butylated urea resin, butylated urea melamine resin, glycoluril resin, acetoguanamine resin, and cyclohexylguanamine resin.
- a melamine resin is preferable from the viewpoint of scratch resistance and chemical resistance due to thermosetting.
- methylated melamine resins examples include Cymel 300, 301, 303, 350, 370, 771, 325, 327, 703, 712, 715, 701, 267, 285, 232, 235, 236, 238, 211, 254, 204, 212, Commercial products manufactured by Mitsui Cytec Co., Ltd. such as 202 and 207; commercial products manufactured by BASF Corp. such as LUWIPAL063, 066, 068, 069, 072, and 073; manufactured by DIC Corporation such as Super Becamine L-105 Commercial products manufactured by Hitachi Chemical Co., Ltd. such as Melan 522, 523, 620, 622, and 623 can be exemplified.
- n-butylated melamine resin commercial products manufactured by Mitsui Cytec Co., Ltd. such as Mycoat 506 and 508; Uban 20SB, 20SE, 21R, 22R, 122, 125, 128, 220, 225, 228, 28-60 , 20HS, 2020, 2021, 2028, 120, etc., commercial products manufactured by Mitsui Chemicals, Inc .; PLASFAL EBS 100A, 100B, 400B, 600B, CB, etc., commercial products, manufactured by BASF Corp .; Super Becamine J-820 , L-109, L-117, L-127, L-164, and other commercial products manufactured by DIC Corporation; Melan 21A, 22, 220, 1303, 2000, 2030, 8000, etc., manufactured by Hitachi Chemical Co., Ltd.
- Examples of the mixed alkylated melamine resin include commercial products manufactured by Mitsui Cytec Co., Ltd. such as Cymel 267, 285, 232, 235, 236, 238, 211, 254, 204, 212, 202, and 207. These may be used alone or in combination.
- the composition ratio (content ratio) of both components of the acrylic resin (A1) and the cross-linked cured resin (A2) in the thermosetting resin composition (A) can be varied within a wide range depending on the purpose.
- the amount of isocyanate groups in the blocked isocyanate resin is 0.1 to 1.0 mol, preferably 0.2 to 0.8 mol, relative to 1 mol of (OH + COOH) groups in the acrylic resin (A1). good.
- the amount of the amino resin is 5 to 25 parts by mass, preferably 8 to 15 parts by mass with respect to 100 parts by mass of the acrylic resin (A1) solid content.
- the addition amount of the cross-linked cured resin (A2) is small, the abrasion resistance is poor.
- the addition amount of the cross-linked cured resin (A2) is increased, bending workability is inferior, so that fine cracks are formed in the coating film during processing, leading to a decrease in corrosion resistance.
- a sulfonic acid-based or amine-based catalyst is used as an amino resin curing catalyst.
- P-toluenesulfonic acid and dodecylbenzenesulfonic acid which are sulfonic acid catalysts are preferable. 0.1-3.0 parts by mass, preferably 0.3-1.0 parts by mass of P-toluenesulfonic acid or dodecylbenzenesulfonic acid per 100 parts by mass of the solid content of the thermosetting resin composition (A). It is desirable to contain part by mass. If the amount of the amino resin curing catalyst is 0.1 parts by mass or less, the effect cannot be obtained. When the amount of the amino resin curing catalyst is 3 parts by mass or more, not only the curing is saturated but also the workability is deteriorated.
- Curing catalysts for blocked isocyanate resins include di-n-butyltin oxide, n-dibutyltin chloride, di-n-butyltin dilaurate, di-n-butyltin diacetate, di-n-octyltin oxide, di- Examples thereof include n-octyltin dilaurate and tetra-n-butyltin. Each may be added as necessary, and may be used alone or in combination.
- the clear coating resin composition may further be mixed with a leveling agent, an antifoaming agent, an antioxidant, an ultraviolet absorber, a matting agent, a silane coupling agent, and the like as additives. Further, pigments or dyes may be dispersed to form a color clear coating film, or a luster material such as an aluminum paste or a pearl pigment may be mixed to provide design. Moreover, you may contain an epoxy resin, a silicon resin, a fluororesin, a polyester resin, etc. as needed.
- the clear coating resin composition of this embodiment contains 0.5 to 4.0 parts by mass of resin beads (B) per 100 parts by mass of the thermosetting resin composition (A). If the content of the resin beads is less than 0.5 parts by mass, the effect of anti-scratch property cannot be obtained. When the resin bead content exceeds 4.0 parts by mass, the transparency of the clear coating film is deteriorated and the coating workability is also lowered.
- the content of the resin beads is particularly preferably 1.0 to 3.0 parts by mass, and more preferably 1.0 to 2.0 parts by mass.
- the resin beads (B) preferably have an average particle size of 0.20 to 3.0 times the required coating thickness of the clear coating film.
- resin beads having an average particle diameter of 0.20 to 3.0 times the required coating thickness of the clear coating film it is possible to achieve the good anti-resistance characteristic of this embodiment without significantly reducing the surface gloss of the clear coating film. Pressure mark property and scuff resistance can be obtained. If the average particle diameter of the resin beads (B) is less than 0.20 times the coating required film thickness, the resin beads have too small a particle size, resulting in a decrease in function as an aggregate, pressure mark resistance, and scratch resistance. There is no effect on sex.
- the average particle size of the resin beads (B) is preferably 0.3 to 2.0 times the required coating thickness of the clear coating film, more preferably 0.5 to 1.3 times, and 0.8 to 1.0. Double is most preferred.
- the average particle size of the resin beads (B) is generally determined from the particle size distribution measured by a laser diffraction method.
- the material of the resin beads (B) examples include acrylic resin, urethane resin, benzoquamine resin, styrene resin, polyethylene resin, polypropylene resin, and fluorine resin.
- the material of the resin beads (B) is preferably an acrylic resin, a urethane resin, or a fluororesin.
- the paint is solvent-based, solvent resistance is required, and therefore, a crosslinked resin bead is preferable.
- Cross-linked acrylic resin beads include Art Pearl A-400, G-200, G-400, G-600, G-800, GR-200, GR-300, GR-400, GR-600, GR-800, Commercial products made by Negami Kogyo Co., Ltd.
- Cross-linked urethane resin beads include Art Pearl C-100, C-200, C-300, C-400, C-800, CZ-400, P-400T, P-800T, HT-400BK, U-600T, Examples include commercial products made by Negami Kogyo Co., Ltd., such as CF-600T, MT-400BR, and MT-400YO.
- Fluorine resin beads include DYNEON PTFE micro powder TF-9201, TF-9205, TF-9207, and other commercial products manufactured by Sumitomo 3M; Fluon PTFE Lubricant L-150J, L-169J, L-170J, L- Examples include commercially available products made by Asahi Glass Co., Ltd. such as 172J and L-173J. These may be added as needed, and may be used alone or in combination.
- the slick property is improved and the scuff resistance is further improved.
- various transparent organic pigments and inorganic pigments may be added.
- the requirement for the design property becomes more severe, and even a minute pressure mark or rubbing so as not to cause a problem with a conventional transparent clear may cause a problem.
- the management of the coating film thickness and the management of the resin bead particle size in a more preferable range are required.
- a method of adding the resin beads to the resin composition by narrowing the particle size distribution of the resin beads through a dispersion step is desirable.
- the thickness of the clear-coated film is preferably 1 to 10 ⁇ m, more preferably 2 to 6 ⁇ m, and most preferably 3 to 5 ⁇ m.
- the film thickness of the clear coating film exceeds 10 ⁇ m, the coating workability in one coat and one bake deteriorates.
- the bending processability of the clear coating film is reduced, and microcracks are formed during the bending process, leading to a decrease in corrosion resistance.
- the film thickness increases, it is necessary to increase the average particle diameter of the resin beads added to ensure pressure mark resistance. However, if the average particle diameter of the resin beads increases, the design as a clear-coated stainless steel sheet Sex is reduced.
- the thickness of the clear coating film is less than 1 ⁇ m, it is difficult to control the film thickness, and the design properties are deteriorated.
- the stainless steel plate Before coating the clear coating film, it is preferable to subject the stainless steel plate to a chemical conversion treatment.
- the chemical conversion treatment liquid non-chromate is preferable in consideration of environmental problems. In general, aminosilane-based and epoxysilane-based coupling agents are preferred.
- the stainless steel plate was subjected to chemical conversion treatment so that the amount of chemical conversion solution deposited was 2 to 50 mg / m 2 (measured by the amount of SiO 2 by fluorescent X-rays), and then the surface temperature (PMT) of the stainless steel plate material was 60 It is baked and dried under a condition of about ⁇ 140 ° C.
- N-2 (aminoethyl) 3-aminopropylmethyldimethoxysilane, N-2 (aminoethyl) 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyl A triethoxysilane is mentioned.
- the epoxy-based silane coupling agent include silane coupling agents such as 2- (3,4 epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 3-glycidoxypropylmethyldiethoxysilane. Can be mentioned. These may be used alone or in combination.
- the chemical conversion liquid can be applied by using a method such as spraying, roll coating, curtain flow coating, electrostatic coating, or the like.
- Drying may be performed by evaporating moisture, and the temperature is suitably 60 to 140 ° C. as a temperature reached by the stainless steel plate material (PMT).
- a known pretreatment such as alkali degreasing, acid or alkali etching may be performed as necessary.
- the clear coating film may be applied not only to the front side of the stainless steel plate but also to the back side. Moreover, the back surface of the stainless steel plate may not be clear coating.
- the coating film thickness on the back surface of the stainless steel plate may be about 1 to 6 ⁇ m.
- Resins such as epoxy, acrylic, urethane, and polyester are used. If there is a coating film on the back side, the pressure mark resistance is good.
- a clear coating film containing a blocked isocyanate resin and an amino resin as a crosslinkable curable resin for crosslinking and curing an acrylic resin, and further containing a crosslinked resin bead having a certain particle diameter is provided. Therefore, good pressure mark resistance and scuff resistance can be achieved.
- Thermosetting resin compositions A-1 and B-2 were obtained by mixing the obtained acrylic resin with a crosslinkable curable resin shown in Table 1.
- a crosslinkable curable resin shown in Table 1.
- the block isocyanate of the crosslinkable curable resin Death Module VPLS 2253 (manufactured by Sumika Bayer Urethane Co., Ltd.) having an NCO group content of 10.5% was used.
- the melamine resin Cymel 327 (Mitsui Cytec Co., Ltd.) was used.
- the mixing ratio of the acrylic resin and the crosslinkable curable resin is as shown in Table 1.
- the compounding ratio of Table 1 is a mass part.
- thermosetting resin compositions A-1 to B-2 were mixed with the additive components and resin beads shown in Tables 2 to 4, thereby being used for clear coating in Examples 1 to 14 and Comparative Examples 1 to 5.
- a resin composition was obtained.
- the units of the blending amounts in Tables 2 to 4 are all parts by mass. However, since the thinner added at the time of mixing volatilizes during drying, the resin bead mass part per 100 mass parts of the solid content of the thermosetting resin composition is described as “resin beads / thermosetting resin composition solid content”. .
- the obtained clear coating resin composition was coated on a stainless steel plate with a bar coater so that the coating amount was 3.0 to 4.0 g / m 2 .
- baking was performed under the condition that the surface temperature (PMT) was 232 ° C.
- the clear coated stainless steel sheets of Examples 1 to 7 and Comparative Examples 1 to 5 shown in Tables 2 to 3 were obtained.
- the clear coated stainless steels of Examples 8 to 11 were adjusted so that the coating film thickness was 3, 10, and 18 ⁇ m.
- a steel plate was obtained.
- Table 4 in order to confirm the influence of the type of resin beads, clear coated stainless steel plates of Examples 12 to 14 were obtained.
- the addition amount of the thermosetting resin composition represents the mass part of the solid content.
- the addition amount of acid catalyst (P-toluenesulfonic acid) and tin catalyst (di-n-butyltin dilaurate), leveling agent and antifoaming agent (both acrylic resin) are the main components excluding solvents.
- the mass part of the component) is shown.
- the resin beads A to C are cross-linked acrylic resin beads manufactured by Gantz Kasei, and the average particle size is 3 ⁇ m for the resin beads A, 7 ⁇ m for B, and 10 ⁇ m for C.
- Resin beads D are cross-linked urethane resin beads manufactured by Negami Kogyo and have an average particle size of 3 ⁇ m.
- the resin beads E are fluorine resin beads manufactured by Asahi Glass, and the average particle diameter is 3 ⁇ m.
- the resin beads F used in Example 14 are PE resin beads manufactured by BYK-Chemie, and the average particle diameter is 3.5 ⁇ m.
- As the polyethylene wax CERAFLOUR 961 (BYK-Chemie (Big Chemie)) having an average particle diameter of 3.5 ⁇ m was used.
- Examples 1 to 14 clear coating containing a thermosetting resin composition containing a blocked isocyanate resin and an amino resin as a resin for crosslinking and curing the acrylic resin, and resin beads having a predetermined amount and an average particle diameter It can be seen that a clear-coated stainless steel sheet excellent in pressure mark resistance and rust resistance can be obtained by providing the film.
- Examples 1 to 9, 12, and 13 include the thermosetting resin compositions of A-1 to A-4 and a predetermined amount of resin beads, and the resin beads average particle diameter / coating thickness is It is 0.20 to 3.0 times. For this reason, the evaluation of either or both of pressure mark resistance and rust resistance was very good at 5.
- Examples 10 and 11 are examples in which the coating thickness is thin and thick with respect to the average particle diameter of the resin beads. Since both contained a predetermined amount of resin beads, the pressure mark resistance and anti-scratch resistance were acceptable levels.
- Example 14 is an example in which the type of resin beads is PE. Since a predetermined amount of resin beads was contained, the pressure mark resistance and the rust resistance were acceptable levels.
- thermosetting resin composition of B-1 (Comparative Example 1) is important not only for pressure mark resistance and scuff resistance but also as a general characteristic of the clear coating film. The processability, hardness and chemical resistance were poor.
- the example using the thermosetting resin composition of B-2 (Comparative Example 2) was inferior in all evaluation items.
- the example with a small resin bead content (Comparative Example 3) was inferior in pressure mark resistance and workability of the coating film.
- Examples with a high resin bead content (Comparative Examples 4 and 5) are excellent in pressure mark resistance and scuff resistance, but are inferior in glossiness, which is important for coating processability and design of clear-coated stainless steel sheets. It was.
- a clear-coated stainless steel sheet that maintains the design of the stainless steel sheet and is excellent in pressure mark resistance and scuff resistance.
- This clear-coated stainless steel sheet can be suitably applied as a housing, interior material, and exterior material for home appliances that take advantage of the beautiful metallic luster unique to stainless steel.
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Abstract
Description
本願は、2010年3月30日に、日本に出願された特願2010-077367号及び2011年2月14日に、日本に出願された特願2011-029016号に基づき優先権を主張し、その内容をここに援用する。
前記クリヤ塗装膜は、熱硬化性樹脂組成物(A)と、前記熱硬化性樹脂組成物(A)の固形分100質量部あたり0.5~4.0質量部の樹脂ビーズ(B)と、を含有する。
前記熱硬化性樹脂組成物(A)は、アクリル樹脂(A1)と、前記アクリル樹脂(A1)を架橋硬化させるブロックイソシアネート樹脂及びアミノ樹脂よりなる架橋硬化樹脂(A2)と、を含む。
前記アクリル樹脂(A1)は、水酸基、カルボキシル基、及びアルコキシシラン基から選択される1種以上の架橋性官能基を含み、ガラス転移点が30~90℃であり、数平均分子量が3000~50000である。
(2)前記(1)に記載の耐プレッシャーマーク性及び耐擦り疵性に優れたクリヤ塗装ステンレス鋼板では、前記樹脂ビーズ(B)の平均粒径が、前記クリヤ塗装膜の膜厚の0.20~3.0倍であってもよい。
(3)前記(1)又は(2)に記載の耐プレッシャーマーク性及び耐擦り疵性に優れたクリヤ塗装ステンレス鋼板では、前記樹脂ビーズ(B)が、架橋型アクリル樹脂ビーズ、架橋型ウレタン樹脂ビーズ、及びフッ素樹脂ビーズから選択される1種または2種以上であってもよい。
更に、本発明の一態様に係るクリヤ塗装ステンレス鋼板によれば、樹脂ビーズの平均粒径をクリヤ塗装膜の膜厚に対する相対的な大きさで規定することによって、クリヤ塗装ステンレス鋼板の耐プレッシャーマーク性及び耐擦り疵性をより高めることができる。
熱硬化性樹脂組成物(A)は、水酸基、カルボキシル基、及びアルコキシシラン基から選択される1種以上の架橋性官能基を含み、ガラス転移点が30~90℃であり、数平均分子量が3000~50000であるアクリル樹脂(A1)と、前記アクリル樹脂を架橋硬化させるブロックイソシアネート樹脂及びアミノ樹脂よりなる架橋硬化樹脂(A2)と、を少なくとも含有する。
本実施形態における水酸基、カルボキシル基、、及びアルコキシシラン基から選択される1種以上の架橋性官能基を有するアクリル樹脂(A1)は、塗料用樹脂として既知の方法により得られるものである。
非官能性単量体としては、例えば、アクリル酸メチル、アクリル酸エチル、アクリル酸イソプロピル、アクリル酸n-ブチル、アクリル酸2-エチルヘキシル、メタアクリル酸メチル、メタアクリル酸エチル、メタアクリル酸イソプロピル、メタアクリル酸n-ブチル、メタアクリル酸n-ヘキシル、アクリル酸シクロヘキシル、メタクリル酸シクロへキシル、メタクリル酸ラウリル等の脂肪族又は環式アクリート;メチルビニルエーテル、エチルビニルエーテル、n-プロピルビニルエーテル、n-ブチルビニルエーテル等のエーテル類;スチレン、a-メチルスチレン等のスチレン類;アクリルアミド、N-メチロールアクリルアミド、ジアセトンアクリルアミド等のアクリルアミド系単量体等から選ばれる1種または2種以上が挙げられる。
次に、熱硬化性樹脂組成物(A)のもう一つの構成成分である架橋硬化樹脂(A2)は、ブロックイソシアネート樹脂とアミノ樹脂の混合物である。
ポリイソシアネートとしては、トリレンジイソシアネート、ジフェニルメタンジイソシアネート、キシレンジイソシアネート、ナフタレンジイソシアネート等の芳香族ジイソシアネート;ヘキサメチレンジイソシアネート、ダイマー酸ジイソシアネート等の脂肪族ジイソシアネート;イソホロンジイソシアネート、シクロヘキサンジイソシアネートなどの脂環族ジイソシアネート;前記ポリイソシアネートのビューレットタイプの付加物、イソシアヌル環タイプ付加物等が挙げられる。
n-ブチル化メラミン樹脂としては、マイコート506、508などの三井サイテック(株)製の市販品;ユーバン20SB、20SE、21R、22R、122、125、128、220、225、228、28-60、20HS、2020、2021、2028、120などの三井化学(株)製の市販品;PLASTOPAL EBS 100A、100B、400B、600B、CBなどのBASF(株)製の市販品;スーパーベッカミンJ-820、L-109、L-117、L-127、L-164などのDIC(株)製の市販品;メラン21A、22、220、1303、2000、2030、8000などの日立化成工業(株)製の市販品;テスアジン3020、3021、3036などの日立化成ポリマー(株)製の市販品を例示できる。
イソブチル化メラミン樹脂としては、ユーバン60R、62、62E、360、361、165、166-60、169、2061などの三井化学(株)製の市販品;スーパーベッカミンG-821、L-145、L-110、L-125などのDIC(株)製の市販品;PLASTOPAL EBS 4001、FIB、H731B、LR8824などのBASF(株)製の市販品;メラン27、28、28D、245、265、269、289などの日立化成工業(株)製の市販品を例示できる。
混合アルキル化メラミン樹脂としては、サイメル267、285、232、235、236、238、211、254、204、212、202、207などの三井サイテック(株)製の市販品などを例示できる。
これらは、単独もしくは併用で使用しても良い。
続いて、クリヤ塗装ステンレス鋼板の品質を確保するために重要な耐プレッシャーマーク性と耐疵付き性を発現させる樹脂ビーズ(B)について述べる。
樹脂ビーズの含有量が0.5質量部未満では、耐疵付き性の効果が得られない。樹脂ビーズの含有量が4.0質量部超では、クリヤ塗装膜の透明性が劣化すると共に、塗装作業性も低下する。この樹脂ビーズの含有量は、特には1.0~3.0質量部が好ましく、さらには1.0~2.0質量部が好ましい。
樹脂ビーズ(B)の平均粒径は、クリヤ塗装膜の塗装必要膜厚の0.3~2.0倍が好ましく、0.5~1.3倍が更に好ましく、0.8~1.0倍が最も好ましい。樹脂ビーズ(B)の平均粒径は、一般にレーザー回折法により測定された粒度分布から求められる。
架橋型ウレタン樹脂ビーズとしては、アートパールC-100、C-200、C-300、C-400、C-800、CZ-400、P-400T、P-800T、HT-400BK、U-600T、CF-600T、MT-400BR、MT-400YOなどの根上工業(株)製の市販品等が例示される。
フッ素樹脂ビーズには、DYNEON PTFE マイクロパウダー TF-9201、TF-9205、TF-9207などの住友3M(株)製の市販品;Fluon PTFE ルブリカント L-150J、L-169J、L-170J、L-172J、L-173Jなどの旭硝子(株)製の市販品等が例示される。
これらはそれぞれ必要に応じて添加すればよく、単独もしくは、混合して使用しても良い。
エポキシ系シランカップリング剤としては、2-(3,4エポキシシクロヘキシル)エチルトリメトキシシラン、3-グリシドキシプロピルトリメトキシシラン、3-グリシドキシプロピルメチルジエトキシシラン等のシランカップリング剤が挙げられる。
これらは、単独もしくは混合して使用しても良い。
温度計、還流冷却器、攪拌器、滴下ロート、窒素ガス導入管を備えた4つ口フラスコに、表1に示された量(質量部)のトルエン、酢酸ブチルを入れ、110℃まで昇温し、次いで、窒素ガスを吹き込みながら攪拌した。この状態で溶液を攪拌しながら、メタアクリル酸メチル、スチレン、メタアクリル酸n-ブチル、メタアクリル酸2-ヒドロキシエチル、アクリル酸2-ヒドロキシエチル、アクリル酸メチル、アゾビスイソブチロニトリル(AIBN)から選ばれる原料の混合物を3時間かけて滴下した。滴下終了後、さらにAIBNを添加して、同温度(110℃)でさらに3時間反応させた。以上により、不揮発分50質量%のアクリル系共重合体(アクリル樹脂)を得た。
得られたアクリル樹脂の数平均分子量及びガラス転移点を表1に示す。
なお、表1の配合比は質量部である。
なお、表2~表4の配合量の単位は、全て質量部である。ただし、混合時に添加したシンナーは乾燥時に揮発するため、熱硬化性樹脂組成物の固形分100質量部あたりの樹脂ビーズ質量部を、「樹脂ビーズ/熱硬化性樹脂組成物固形分」として記載した。
これらのステンレス鋼板上にノンクロメートの化成処理液をロールコーターにて塗装した。この化成処理液の塗装は、SiO2付着量が2~10mg/m2になる条件で行った。なお、SiO2付着量は、蛍光X線にて測定した。次いで、表面到達温度(PMT)が100℃になる条件でステンレス鋼板を乾燥させた。
また、表4に示すように、塗膜厚さと樹脂ビーズの平均粒径の影響を確認するために、塗膜厚さを3、10、18μmとなるように実施例8~11のクリヤ塗装ステンレス鋼板を得た。
更に、表4に示すように、樹脂ビーズの種類の影響を確認するために、実施例12~14のクリヤ塗装ステンレス鋼板を得た。
樹脂ビーズA~Cは、ガンツ化成製の架橋型アクリル樹脂ビーズであり、平均粒径は、樹脂ビーズAが3μm、Bが7μm、Cが10μmである。樹脂ビーズDは、根上工業製の架橋型ウレタン樹脂ビーズであり、平均粒径は3μmである。樹脂ビーズEは、旭硝子製のフッ素系樹脂ビーズであり、平均粒径は3μmである。実施例14にて用いた樹脂ビーズFは、BYK-Chemie製のPE樹脂ビーズであり、平均粒径は3.5μmである。
ポリエチレンワックスとしては、CERAFLOUR 961(BYK-Chemie(ビックケミー)社製)の平均粒径3.5μmのものを用いた。
評価方法は以下の通りである。結果を表2~4に示す。
供試材を2枚重ね、40℃の雰囲気で10kg/cm2の圧力でプレスした。このプレスした状態のまま24時間保持した。24時間後に、その耐プレッシャーマーク性を評価した。評価は、以下のランク1~5の5段階で行った。
ランク5:プレッシャーマークがない(合格)
ランク4:ほとんどプレッシャーマークが目立たない(合格)
ランク3:見る角度によっては、はっきりとプレッシャーマークが確認できる(不合格)
ランク2:プレッシャーマークによって色調・光沢の劣化が見られる。(不合格)
ランク1:著しく光沢が低下し、どの方向からもプレッシャーマークが確認できる(不合格)
摩擦子としてクレンザーを染み込ませたガーゼを、荷重200gで供試材の表面に当接させた。この状態でガーゼを50往復させて、供試材の表面を研磨した。そして、耐擦り疵性を評価した。評価は、以下のランク1~5の5段階で行った。
ランク5:擦り疵がない(合格)
ランク4:ほとんど擦り疵が目立たない(合格)
ランク3:はっきりと擦り疵が確認できる(不合格)
ランク2:擦り疵で塗膜の光沢がなくなっている(不合格)
ランク1:塗膜が削れ、素地に達している(不合格)
JIS K5600 5-2(耐カッピング性)に従って評価した。評価は、クラックが生じた深さによって、以下のランク1~5の5段階で行った。
ランク5:7mm以上(合格)
ランク4:5~7mm(合格)
ランク3:3~5mm(不合格)
ランク2:1~3mm(不合格)
ランク1:1mm以下(不合格)
JIS K5600 5-4(引っかき硬度(鉛筆法))に従って評価した。評価は、下記のランク1~5の5段階で行った。
ランク5:4H以上(合格)
ランク4:3H(合格)
ランク3:2H(不合格)
ランク2:H(不合格)
ランク1:H未満(不合格)
JIS K5600 4-7 鏡面光沢度に従って評価した。評価は、下記のランク1~5の5段階で行った。
ランク5:100以上(合格)
ランク4:80~100(合格)
ランク3:60~80(不合格)
ランク2:40~60(不合格)
ランク1:40未満(不合格)
5%硫酸と5%水酸化ナトリウムを、それぞれ供試材に2mL滴下し、蓋をした。この状態で16時間放置した。その後の塗膜の状態を観察し、評価した。評価は、下記のランク1~5の5段階で行った。
ランク5:跡が全く無い(合格)
ランク4:跡が僅かに認められる(合格)
ランク3:跡がやや目立つ(不合格)
ランク2:跡が濃く残る(不合格)
ランク1:剥離する(不合格)
詳細には、実施例1~9,12,13は、A-1~A-4の熱硬化性樹脂組成物と、所定の量の樹脂ビーズとを含み、樹脂ビーズ平均粒径/塗装厚が0.20~3.0倍である。このため、耐プレッシャーマーク性と耐すり疵性のいずれか一方または両方の評価が5と大変良好であった。
実施例10,11は、樹脂ビーズの平均粒径に対して塗膜厚が薄い場合と厚い場合の例である。いずれも、所定の量の樹脂ビーズを含有しているため、耐プレッシャーマーク性及び耐すり疵性は合格レベルであった。
実施例14は、樹脂ビーズの種類がPEの例である。所定の量の樹脂ビーズを含有しているため、耐プレッシャーマーク性及び耐すり疵性は合格レベルであった。
B-2の熱硬化性樹脂組成物を用いた例(比較例2)は、全ての評価項目において劣っていた。
樹脂ビーズ含有量が少ない例(比較例3)は、耐プレッシャーマーク性及び塗膜の加工性に劣っていた。
樹脂ビーズ含有量が多い例(比較例4,5)は、耐プレッシャマーク性や耐擦り疵性には優れるが、塗膜の加工性およびクリヤ塗装ステンレス鋼板の意匠性として重要な光沢度で劣っていた。
Claims (3)
- ステンレス鋼板と、前記ステンレス鋼板の2つの主面のいずれか一方又は両方に塗布されたクリヤ塗装膜と、を具備し、
前記クリヤ塗装膜は、熱硬化性樹脂組成物(A)と、前記熱硬化性樹脂組成物(A)の固形分100質量部あたり0.5~4.0質量部の樹脂ビーズ(B)と、を含有し、
前記熱硬化性樹脂組成物(A)は、アクリル樹脂(A1)と、前記アクリル樹脂(A1)を架橋硬化させるブロックイソシアネート樹脂及びアミノ樹脂よりなる架橋硬化樹脂(A2)と、を含み、
前記アクリル樹脂(A1)は、水酸基、カルボキシル基、及びアルコキシシラン基から選択される1種以上の架橋性官能基を含み、ガラス転移点が30~90℃であり、数平均分子量が3000~50000であることを特徴とする耐プレッシャーマーク性及び耐擦り疵性に優れたクリヤ塗装ステンレス鋼板。 - 前記樹脂ビーズ(B)の平均粒径が、前記クリヤ塗装膜の膜厚の0.20~3.0倍であることを特徴とする請求項1に記載の耐プレッシャーマーク性及び耐擦り疵性に優れたクリヤ塗装ステンレス鋼板。
- 前記樹脂ビーズ(B)が、架橋型アクリル樹脂ビーズ、架橋型ウレタン樹脂ビーズ、及びフッ素樹脂ビーズから選択される1種または2種以上であることを特徴とする請求項1又は2に記載の耐プレッシャーマーク性及び耐擦り疵性に優れたクリヤ塗装ステンレス鋼板。
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