WO2007145368A1 - Composition de revêtement - Google Patents

Composition de revêtement Download PDF

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Publication number
WO2007145368A1
WO2007145368A1 PCT/JP2007/062365 JP2007062365W WO2007145368A1 WO 2007145368 A1 WO2007145368 A1 WO 2007145368A1 JP 2007062365 W JP2007062365 W JP 2007062365W WO 2007145368 A1 WO2007145368 A1 WO 2007145368A1
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WO
WIPO (PCT)
Prior art keywords
mass
parts
coating composition
colored
paint
Prior art date
Application number
PCT/JP2007/062365
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English (en)
Japanese (ja)
Inventor
Yasuhiro Tomizaki
Yasuyuki Suzuki
Takato Adachi
Original Assignee
Kansai Paint Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Kansai Paint Co., Ltd. filed Critical Kansai Paint Co., Ltd.
Priority to JP2008521291A priority Critical patent/JPWO2007145368A1/ja
Publication of WO2007145368A1 publication Critical patent/WO2007145368A1/fr

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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
    • 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
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/572—Three layers or more the last layer being a clear coat all layers being cured or baked together

Definitions

  • a first colored paint, a water-based second colored paint, and a talya paint are sequentially applied on an object to be coated, and the resulting three-layer paint film is heated and cured simultaneously.
  • the present invention relates to a paint for use as a first colored paint in a composition method.
  • an electrodeposition coating film is formed on an object to be coated, and then an intermediate coating is applied, a baking and curing is applied, a base coating is applied, a clear coating is applied, and a baking and curing is applied.
  • a method of forming a multi-layer coating film by the beta (3 C 2B) method has been widely adopted, but in recent years, from the viewpoint of energy saving, the baking hardening process after painting of the intermediate coating has been omitted, After the electrodeposition coating is formed, the intermediate coating is applied, the base coat coating is applied, the tarrier coating is applied, and the baking coating is performed.
  • a three-coat one-bake (3 C 1 B) method is used to form a multilayer coating. An attempt has also been made (see, for example, JP-A-10-216617).
  • the 3 C 1 B method has a drawback that the intermediate coating film and the base coat film are likely to be mixed, and the smoothness of the resulting coating film is reduced. This is an issue. Disclosure of the invention
  • An object of the present invention is to provide a coating composition for use as a first colored coating that can form a coating film excellent in smoothness and sharpness in the 3 C 1 B system.
  • the present inventors have determined that the 3 C 1 B method When a paint containing a low acid value hydroxyl group-containing resin and a polyisocyanate compound is used as the first colored paint in the coating process of the multi-layer paint film, the multi-layer paint film having excellent smoothness and sharpness The present invention has been completed.
  • the present invention provides the following steps (1) to (4):
  • the first colored paint (A) is applied on the object to be coated to form the first colored coating film.
  • a water-based second colored paint (B) is applied on the formed first colored coating film to form a second colored coating film.
  • the first colored coating film, the second colored coating film and the clear coating film to be formed are simultaneously baked and cured.
  • a coating composition comprising 30 to 95 parts by mass of a hydroxyl group-containing resin (a) having an acid value of g or less and 5 to 70 parts by mass of a polyisocyanate compound (b) is provided. is there.
  • a multilayer coating film excellent in smoothness and sharpness can be easily formed by the 3 C 1 B method.
  • the first colored paint (A) is applied onto the object to be coated to form the first colored coating film.
  • Article The object to which the first colored paint (A) can be applied according to the present invention is not particularly limited.
  • an outer plate part of an automobile body such as a passenger car, a truck, a motorcycle, a bus, etc .
  • the outer plate portion of home electric products such as telephones and audio equipment can be cited, and among them, the outer plate portion of automobile bodies and automobile parts are preferable.
  • the material of the above-mentioned object to be coated is not particularly limited.
  • Metal materials such as matt steel; polyethylene resin, polypropylene resin, acrylonitrile-butadiene-styrene (ABS) resin, polyamide resin, acrylic resin, vinylidene chloride resin, polycarbonate resin, Resin materials such as polyurethane resin and epoxy resin and various plastic materials such as FRP; inorganic materials such as glass, cement and concrete; wood; fiber materials (paper, cloth, etc.), etc.
  • metal materials and plastic materials are suitable.
  • the object to be coated may be one in which a surface treatment such as a phosphate treatment, a chromate treatment, or a complex oxide treatment is performed on a metal surface of the metal material or a vehicle body formed from the metal material. Further, the object to be coated may be one in which an undercoat film such as various electrodeposition paints is formed on the metal base material, the vehicle body, etc. Among them, the undercoat film is formed by a cationic electrodeposition paint. A formed vehicle body is particularly suitable.
  • the first colored paint (A) a hydroxyl group-containing resin (a) having an acid value of 15 mg K OHZ g or less based on 100 parts by mass of the resin solid content in the paint composition is used.
  • a coating composition comprising 0 to 95 parts by mass and 5 to 70 parts by mass of the polyisocyanate compound (b) (hereinafter referred to as the coating composition of the present invention) is used.
  • the resin solid content in the paint (composition) is the total amount of the base resin and the crosslinking agent in the paint (composition). Hydroxyl-containing resin (a)
  • the hydroxyl group-containing tsukizuki (a) used as the base resin in the coating composition of the present invention preferably has at least one hydroxyl group in one molecule and generally has an acid value of 15 mg KO HZ g or less.
  • Wow! To 12 mg KOH / g, more preferably 3 to 10 mg KOH / g, specifically, for example, containing a hydroxyl group and optionally further containing a carboxyl group.
  • the resins include polyester resins, acrylic resins, polyether resins, polycarbonate resins, and urethane resins. Of these, a hydroxyl group-containing acrylic resin and a hydroxyl group-containing polyester resin are preferable, and a hydroxyl group-containing polyester resin is particularly preferable.
  • the hydroxyl group-containing polyester resin can be produced by, for example, an esterification reaction or a transesterification reaction between a polybasic acid component and a polyhydric alcohol component, and specifically, for example, a carboxyl group in the polybasic acid component. And an equivalent ratio of hydroxyl groups in the polyhydric alcohol component (COOH / OH) is less than 1, and the esterification reaction can be carried out in a state where there are more hydroxyl groups than carboxyl groups.
  • the acid value of the hydroxyl group-containing polyester resin can be adjusted by, for example, performing the esterification reaction while tracking the acid value and terminating the esterification reaction when the target acid value is reached. .
  • the polybasic acid component is a compound having at least two carboxyl groups in one molecule, such as phthalic acid, isophthalic acid, terephthalic acid, succinic acid, dartaric acid, adipic acid, azelaic acid, sebacic acid, Polybasic acids such as tetrahydrophthalic acid, hexahydrophthalic acid, maleic acid, fumaric acid, itaconic acid, trimellitic acid and pyromellitic acid; anhydrides of these polybasic acids; lower alkyl esterified products of these polybasic acids These can be used alone or in combination of two or more.
  • the polyhydric alcohol component is a compound having at least two hydroxyl groups in one molecule, such as ethylene glycol, 1,2-propylene glycol, 1,2-butyl. Tylene glycol, 2,3-butylene glycol, 1,2 monohexanediol, 1,2-dihydroxycyclohexane, 3-ethoxyprono.
  • ⁇ -glycols such as N-1,2-diolone, 3-phenoxypropane-1,2-diol; neopentylglycol, 2-methinoleyl-1,3-propanediole, 2-methyl-1,2,4-1pentane Honole, 3-methyl-1,3-butanediol, 2-ethyl-1-, 3-hexanediol, 2,2-decyl-1,3-propanediol, 2,2,4-trimethyl_1,3-pentanediol, 2—Petinole _ 2—Echinoley 1, 3—Prono.
  • the esterification or transesterification reaction of the polybasic acid component and the polyhydric alcohol component can be performed by a method known per se, for example, the polybasic acid component and the polyhydric alcohol. By subjecting the components to polycondensation at a temperature of about 180 to about 250 ° C.
  • the hydroxyl group-containing polyester resin can be modified with a fatty acid, a monoepoxy compound, or the like, if necessary, during the preparation of the polyester resin or after the esterification reaction.
  • fatty acids examples include coconut oil fatty acid, cottonseed oil fatty acid, hemp seed oil fatty acid, rice bran oil fatty acid, fish oil fatty acid, tall oil fatty acid, soybean oil fatty acid, tung oil fatty acid, tung oil fatty acid, rapeseed oil fatty acid, castor Oil fatty acid, dehydrated castor oil fatty acid, safflower oil fatty acid, and the like.
  • monoepoxy compound include “CARDYURA E 10 P” (trade name, manufactured by Japan Epoxy Resin Co., Ltd., glycidyl ester of synthetic hyperbranched fatty acid). ) And so on.
  • the hydroxyl group-containing polyester resin generally has an acid value within the range of 15 mgKOH / g or less, particularly 1 to 12 mgKOH / g, more particularly 3 to 1 OmgKOH / g, from the viewpoint of smoothness of the resulting coating film. And generally having a number average molecular weight in the range of 500 to 5,000, in particular 700 to 3,000, more particularly 1,000 to 2,000.
  • the hydroxyl group-containing polyester resin generally has a hydroxyl value in the range of 50 to 20 OmgKOHZg, particularly 70 to 17 OmgKOHZg, more particularly 100 to 150 mg KOH / g, from the viewpoint of the curability of the coating film. Is preferred.
  • the “number average molecular weight” and “weight average molecular weight” of the resin or polymer in the present specification are those of the resin or polymer measured by gel permeation chromatography (“HLC81 20GPCJ” manufactured by Tosohichi Co., Ltd.).
  • the number average molecular weight or the weight average molecular weight is a value converted based on the molecular weight of standard polystyrene. This measurement is performed by using “TSKg e 1 G 1 4000HXL”, “TSKg el G—3000HXL”, “TSKg el G — 2500HXL ”and“ TSKg el G—2000HXL ”(both trade names, manufactured by Tosoh Corporation), mobile phase tetrahydrofuran, measurement temperature 40 ° (: flow rate ImLZmin and detector RI conditions were used. Can be done.
  • the hydroxyl group-containing acryl resin is a hydroxyl group-containing polymerizable unsaturated monomer and optionally Furthermore, it can be produced by (co) polymerizing at least one polymerizable unsaturated monomer component including other polymerizable unsaturated monomer copolymerizable with the monomer under ordinary conditions, and the coating obtained From the standpoint of membrane smoothness, etc., it is generally 15 mgKOHZg or less, particularly 1 to 12 mgKOH / g, more particularly 3 to 10 mg KOHZ g, and generally 1,000 to 50,000, It is particularly preferred to have a number average molecular weight in the range of 1,500 to 30,000, more particularly in the range of 2,000 to 10,000.
  • the hydroxyl group-containing acryl resin is generally 20 to 200 mg KO H / g, particularly 30 to L, 50 mg K 0 H / g, more particularly 50 to 100 mg KOH / g, from the viewpoint of the curability of the coating film. It is preferable to have a hydroxyl value within the above range.
  • the hydroxyl group-containing polymerizable unsaturated monomer is a compound having at least one hydroxyl group and polymerizable unsaturated bond in one molecule, such as 2-hydroxyxetyl (meth) acrylate, 2-hydroxypropyl.
  • Monoesterified products of (meth) acrylic acid and dihydric alcohols having 2 to 8 carbon atoms such as (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate; (Meth) acrylic acid and ⁇ -force prolatatone modified product of monoesterified product of dihydric alcohol having 2 to 8 carbon atoms; aryl alcohol; having polyoxyethylene chain whose molecular terminal is a hydroxyl group (meth) acrylate Etc.
  • (meth) atallylate is a generic name for attalylate and metatalylate
  • (meth) atalylic acid is a generic name for acrylic acid and methacrylic acid.
  • polymerizable unsaturated monomers that can be copolymerized with the hydroxyl group-containing polymerizable unsaturated monomer include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, and ⁇ monopropyl (meth) acrylate.
  • the acid value of the hydroxyl group-containing acrylic resin is, for example, that a polymerizable unsaturated monomer component is a carboxyl group-containing polymerizable unsaturated monomer such as (meth) acrylic acid, maleic acid, crotonic acid, or ⁇ -carboxyethyl acrylate. It can be adjusted by using and adjusting the blending amount.
  • a polymerizable unsaturated monomer component is a carboxyl group-containing polymerizable unsaturated monomer such as (meth) acrylic acid, maleic acid, crotonic acid, or ⁇ -carboxyethyl acrylate. It can be adjusted by using and adjusting the blending amount.
  • the hydroxyl group-containing polyester resin or hydroxyl group-containing acrylic resin is used in combination with a so-called urethane-modified polyester resin or urethane-modified acryl resin obtained by extending a polyisocyanate compound to a part of the hydroxyl group in the resin by a urethanization reaction to increase the molecular weight. May be.
  • the hydroxyl group-containing resin (a) has a number average molecular weight of generally from 100 to 2, 000, particularly from 2,000 to 1,700, from the viewpoint of smoothness of the resulting coating film.
  • a polyol compound (c) in the range of 400 to 1,200, more particularly in the range of 400 to 700.
  • polyol compound (c) examples include polyether polyols, polyester polyols, polycarbonate polyols, polyptagene polyols, hydrogenated polybutadiene diene polyols, among which polyester polyols and polycarbonate polyols are preferred, and polyester polyols are preferred. Particularly preferred. These polyol compounds (c) can be used alone or in combination of two or more.
  • polyether polyol examples include ethylene glycol, diethylene glycol, triethylene glycol, propylene dariconol, trimethylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, One or more of compounds having at least two active hydrogen atoms, such as neopentinoreguri cornore, glycerin, trimethylololethane, trimethylololepronone, sorbitol
  • one or more cyclic ether monomers such as ethylene oxide, propylene oxide, butylene oxide, styrene oxide, epichlorohydrin, tetrahydrofuran, and cyclohexylene oxide are subjected to addition polymerization by a conventional method.
  • polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like can be used.
  • polyester polyol examples include polyester polyol obtained by esterifying a polyhydric alcohol component and a polybasic acid component, and ring-opening reaction of a lactone compound using a polyhydric alcohol component as an initiator.
  • polyester polyols obtained examples include polyester polyols obtained.
  • the polyhydric alcohol component and the polybasic acid component for example, those exemplified in the description of the hydroxyl group-containing polyester resin can be used, and these polyhydric alcohol component and polybasic acid component are each independently or Two or more types can be used in combination.
  • examples of the above-described latonone compound include ⁇ -force prolatatatone, poly-methyl- ⁇ -valerolactone, and the like.
  • the polyester polyol preferably has an acid value generally less than 5 mg KOH / g, particularly 0.00 l to 3 mg KOH / g, more particularly 0.01 to 2 mg KO H / g.
  • the number average molecular weight is in the range of 400 to 700 and the acid value is less than 5 mg KOH / g, in particular 0.00 l to 3 mg KOH / g, more particularly in the range of 0.01 to 2 mg KOH / g. Some are particularly suitable.
  • polycarbonate polyol examples include a reaction product of a polyhydric alcohol and phosgene, and a ring-opening polymer of cyclic ester carbonate (alkylene carbonate, etc.).
  • examples of the polyhydric alcohol include 3-methyl-1,1,5-pentanediol and 1,6-hexanediol.
  • examples of the cyclic carbonate include ethylene carbonate, trimethylene carbonate, and tetramethylene. And carbonate.
  • the polycarbonate polyol may have an ester bond as well as a carbonate bond in the molecule.
  • the polyol compound (c) is usually 1 to 50 parts by weight, preferably 5 to 40 parts by weight, more preferably 10 based on 100 parts by weight of the resin solid content in the first colored paint (A). It can be used at a ratio of ⁇ 30 parts by mass.
  • the polyisocyanate compound (b) used as a crosslinking agent in the coating composition of the present invention is a compound having at least two isocyanate groups in one molecule, such as aliphatic polyisocyanate, alicyclic Examples thereof include polyisocyanates, araliphatic polyisocyanates, aromatic polyisocyanates, and derivatives of the polyisocyanates. '
  • aliphatic polyisocyanate examples include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1, 2 1-Putylene Diisocyanate, 2, 3-Butylene Diisocyanate, 1, 3-Petylene Diisocyanate, 2, 4, 4-— or 2, 2, 4--Trimethylhexamethylene Disocyanate, 2, 6 — Aliphatic diisocyanates such as disoocyanatomethyl caproate; lysine ester triisocyanate, 1,4,8-triisocyanatooctane, 1,6,11 1-triisocyanatodecane, 1,8-diisocyanato 4_isocyanatomethyloctane, 1,3,6-triisocyanatohexane, 2,5,7-trimethyl-1,8 Such Jiisoshi annatto 5 _ isocyanato
  • alicyclic polyisocyanate examples include 1,3-cyclopentene diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanatomethyl-1,3, 5,5-Trimethylcyclohexyl isocyanate (common name: isophorone diisocyanate), methyl _ 2,4-cyclohexane Diisocyanate, methyl-2,6-cyclohexanediisocyanate, 1,3_ or 1,4 monobis (isocyanatomethyl) cyclohexane (common name: hydrogenated xylylene diamine) or a mixture thereof, norbornane 1,3,5-triisocyanatocyclohexane, 1,3,5_trimethylisocyanatocyclohexane, 2- (3-isocyanatopropyl) 1-2 5-Di (isocyanatomethyl) -bicyclo (2.
  • araliphatic polyisocyanate examples include 1,3- or 1,4-xylylene diisocyanate or a mixture thereof, ⁇ , ⁇ ′-diisocyanato 1,4-deethylbenzene, 1, 3_ or 1, 4, 5-bis (1 isocyanato 1-methylethyl) benzene (common name: tetramethylxylylene diisocyanate) or a mixture of araliphatic diisocyanates such as 1, 3, 5-triisocyanatomethylbenzene Group triisocyanate and the like.
  • aromatic polyisocyanate examples include m-phenylene diisocyanate, p-phenylene diisocyanate, 4, 4, 1-diphenylenoresiocyanate, 1,5-naphthalene.
  • Diisocyanate Diisocyanate; triphenylmethane 1, 4, 4 '4''one triisocyanate, 1, 3, 5-triisocyanatobenzene, 2, 4, 6-triisocyanato toluene and other aromatic triisocyanates; 4 , 4 ′ — Diphenylmethane 1, 2, 2,, 5, 5 ′ — aromatic tetraisocyanates such as tetraisocyanate.
  • polyisocyanate derivatives examples include dimer, trimer, biuret, alophanate, uretdione, uretoimine, isocyanurate, oxadiazine trione, polymethylene polyphenylisocyanate of the polyisocyanate compound described above. (Crude MD I, Polymeric MD I), Crude TD I, and the like.
  • polyisocyanates and their derivatives may be used alone or in combination of two or more.
  • polyisocyanate compounds aliphatic diisocyanates, alicyclic diisocyanates, and derivatives thereof can be used alone or in combination of two or more.
  • the polyisocyanate compound (b) has a number average molecular weight in the range of generally 300,000 or less, particularly 120 to 1,500.
  • the ratio of the polyisocyanate compound (b) to the hydroxyl group-containing resin (a) is not particularly limited, but the polyisocyanate compound (b) may be used from the viewpoint of coating curability and coating stability.
  • the equivalent ratio of the isocyanate group to the hydroxyl group of the hydroxyl group-containing resin (a) (NC O / OH) is generally 0.5 to 2. ⁇ , especially 0.8 to 1.5, more particularly 0.9 to 1.2: It is preferable to be within the range. Paint composition
  • the coating composition of the present invention comprises 30 to 95 parts by weight, preferably 40 to 80 parts by weight of the hydroxyl group-containing resin (a), based on 100 parts by weight of resin solids in the coating composition.
  • Parts by mass more preferably within the range of 50 to 70 parts by mass and 5 to 70 parts by mass of the polyisocyanate compound (b), preferably 10 to 50 parts by mass, more preferably 20 It can be contained within the range of ⁇ 40 parts by mass.
  • the coating composition of the present invention preferably contains a polyol compound (c), and the content of the polyol compound (c) is based on 100 parts by mass of the resin solid content in the coating composition. Generally, it is preferable to be within the range of 1 to 50 parts by mass, particularly 5 to 40 parts by mass, and more particularly 10 to 3 parts by mass.
  • the acid value is in the range of 3 to 15 mg KOH / g and the number average molecular weight is based on 100 parts by mass of the resin solid content in the coating composition.
  • a coating composition containing 1 to 30 parts by mass of a polyol compound (c) having an average molecular weight in the range of 400 to 70 ° is preferred, and the resulting coating film has excellent smoothness.
  • the polyol compound (c) having a number average molecular weight of 400 to 700 is particularly preferably a polyester polyol and / or a polycarbonate polyol, especially a polyester polyol.
  • the coating composition of the present invention can contain a modifying resin such as polyurethane resin, acrylic resin, alkyd resin, polyester resin, silicone resin, fluorine resin, epoxy resin in addition to the hydroxyl group-containing resin (a).
  • a modifying resin such as polyurethane resin, acrylic resin, alkyd resin, polyester resin, silicone resin, fluorine resin, epoxy resin in addition to the hydroxyl group-containing resin (a).
  • the coating composition of the present invention can also use a melamine resin or the like as an auxiliary crosslinking agent.
  • a melamine resin that can be used
  • methylolated melamine resin obtained by reaction of melamine and aldehyde can be mentioned.
  • the aldehyde include formaldehyde and paraformaldehyde.
  • the alcohol used for etherification include methyl alcohol, ethyl alcohol, and n- propino.
  • Examples include leaanolol, i-propinoreal alcohol, n-butinoreanolecol, i_butylanolol, 2-ethylbutanol, 2-ethylhexanol and the like.
  • melamine resin examples include, for example, Cymel 3 0 3, Cymel 3 2 3, Sai Menole 3 2 5, Saimenore 3 2 7, Saimenole 3 5 0, Saimenole 3 70, Saimenole 3 80, Cymel 3 8 5, Cymel 2 1 2, Cymel 2 5 1, Cymel 2 5 4, My Coat 7 7 6 8 (all of these are trade names, manufactured by Nihon Cytec Industry Co., Ltd.); Resimin 7 3 5, Resimin 7 40 7 4 1, Resimin 7 4 5, Resimin 7 4 6, Resimin 7 4 7 (all are trade names, manufactured by Monsanto); Sumimar M 5 5, Sumimar M 30 W, Sumimar M 50 W (above, All of them are trade names, manufactured by Sumitomo Chemical Co., Ltd.); Euban series such as Uban 20 SB manufactured by Mitsui Chemicals.
  • a sulfonic acid such as paratoluenesulfonic acid, dodecylbenzenesulfonic acid, dinonylnaphthalenesulfonic acid, or a salt of these acids and amines is used as a catalyst. be able to.
  • the melamine resin is generally 30 parts by mass or less, preferably in the range of 1 to 20 parts by mass per 100 parts by mass of the total solid content of the hydroxyl group-containing resin (a) and the polyisocyanate compound (b). Can be used in
  • the coating composition of the present invention preferably contains silicon dioxide (d) from the viewpoint of the sharpness of the resulting coating film, and since the resulting coating film is excellent in smoothness, silicon dioxide (d)
  • silicon dioxide (d)
  • silicon dioxide having a carbon content of 1.0% by mass or less, particularly 0.5% by mass or less, and particularly 0.1% by mass or less is particularly suitable.
  • the carbon content of silicon dioxide is the mass ratio of carbon contained in silicon dioxide to silicon dioxide (d), and is a solid-state carbon analyzer EMI A— 1 10 (trade name, HORIBA, Ltd. Can be used.
  • carbon dioxide is charged into a crucible, heated to 1.000 ° C, the generated gas components are analyzed by infrared absorption, and the total amount of carbon monoxide and carbon dioxide detected is detected. The amount of carbon is obtained, and the mass fraction of the amount of silicon dioxide charged is the amount of carbon in silicon dioxide.
  • the coating composition of the present invention has a low carbon content, that is, a low hydrophobic group and a relatively high hydrophilic silicon dioxide (d), is clearly why the coating film has excellent sharpness.
  • aqueous second colored paint (B) is applied over the paint composition of the present invention, ⁇ this relatively hydrophilic silicon dioxide (d) migrates to the vicinity of the interface between the two coating films. Thus, it is presumed that the mixed layer between the coating films is suppressed.
  • the amount of silicon dioxide (d) is generally within the range of 0.1 to 5 parts by weight, particularly 0.5 to 2 parts by weight, based on 100 parts by weight of resin solids in the coating composition. Is preferred.
  • the coating composition of the present invention is applied such that the cured film thickness is 30 ⁇ and heated at 70 ° C. for 5 minutes.
  • G 7. Is generally applied in a range of 0 to 20% by weight, in particular 0.01 to 15% by weight, more particularly 3 to 10% by weight, and a cured film thickness of 30 m.
  • the gel fraction of the coating film when heated for 10 minutes at C (G 90) is generally 30 to 100 mass 0/0, especially 1:50 to 00 wt%, more particularly from 70 to 1 00% by weight, more particularly It is desirable that it be in the range of 85 to 100% by mass.
  • the gel fraction (G 7. ) And gel fraction (G 9. ) can be measured by the following method: First, the coating composition of the present invention on a polypropylene plate has a cured film thickness of 30. Paint to ⁇ m and heat at 70 ° C or 90 ° C for 10 minutes. Next, the coating film on the polypropylene plate is collected, and the mass (W a ) is measured. After that, the coating film was washed with 200 mesh. The coating weight (W b ) after placing in a tenth steel mesh container, extracting while refluxing in aceton heated to 64 ° C for 5 hours, and drying for 60 minutes at 110 ° C is measured. Measure the residual fraction of insoluble coating film (mass%) calculated according to the following formula as the gel fraction.
  • the gel fraction (G 7. ) And the gel fraction (G 9. ) Of the coating composition of the present invention can be adjusted, for example, by adjusting the blending amount of the curing catalyst in the coating composition.
  • the coating composition of the present invention may contain a color pigment and a pigment or extender pigment that are usually used in the field of paint, and these pigments can be used alone or in combination of two or more.
  • coloring pigment examples include titanium dioxide, carbon black, zinc oxide, zinc phosphate, anoleminium phosphate, zinc molybdate, calcium molybdate, bitumen, ultramarine blue, cobalt blue, phthalocyanine blue, indanthrone blue, Synthetic Yellow Iron Oxide, Transparent Berry (Yellow), Bismaspanadate, Titanium Yellow, Zinc Yellow (Zincero I), Monoazo Yellow, Isoindolinone Yellow, Metal Complex Azo Yellow, Kinoff Talon Yellow, Benzimidazolone Yellow, Mono Red, Yellow B Don letdo, Azo lake (Mn salt), Quinakuri Don magenta, Ansanthrone orange, Gianslaquininorelet, Peri remnanolane, Kinata don magenta, Peri reren let, di Examples include topyrrolopyrrole chromium permillion, chlorinated phthalocyanine green, brominated phthalocyanine green, pyrazolone orange, benzimid
  • the amount of the color pigment is based on 100 parts by mass of the total solid content of the hydroxyl group-containing resin (a) and the polyisocyanate compound (b). Usually, it can be in the range of 1 to 120 parts by mass, preferably 3 to 100 parts by mass, and more preferably 5 to 90 parts by mass.
  • the extender pigment include barita powder, barium sulfate, palium carbonate, calcium carbonate, gypsum, clay, white carbon, diatomaceous earth, tanolec, magnesium carbonate, alumina white, gloss white, and my power flour. Of these, barium sulfate and pino or talc are preferably used.
  • a multilayer coating having an excellent smoothness appearance can be obtained by using barium sulfate having an average primary particle diameter of 1 ⁇ m or less, particularly in the range of 0.1 to 0.8 ⁇ m.
  • a film can be formed.
  • the average primary particle size of the barium sulfate is the value obtained by observing the barium sulfate with a scanning electron microscope and averaging the maximum diameters of 2 ° of barium sulfate on a straight line drawn randomly on the electron micrograph. .
  • the amount of the extender is based on the total solid content of 100 parts by mass of the hydroxyl group-containing resin (a) and the polyisocyanate compound (b). 1 to 120 parts by mass, preferably 1 to 100 parts by mass, more preferably 16 to 90 parts by mass, and the average primary particle size is 1 ⁇ m.
  • the compounding amount of barium sulfate of m or less is usually 1 to 100 parts by mass, preferably 1 based on 100 parts by mass of the total solid content of the hydroxyl group-containing resin (a) and the polyisocyanate compound (b). It can be in the range of 1 to 90 parts by mass, more preferably 16 to 80 parts by mass.
  • the coating composition of the present invention further includes a luster pigment, a curing catalyst, an ultraviolet absorber, a light stabilizer, an antifoaming agent, a plasticizer, an organic solvent, a surface conditioner, an antisettling agent, and a viscosity adjustment.
  • Conventional paint additives such as additives can be contained alone or in combination of two or more.
  • Examples of the bright pigment include, for example, anoreminium, copper, zinc, brass, nickel, aluminum oxide, mica, aluminum oxide coated with titanium oxide and iron oxide, mica coated with titanium oxide and iron oxide, Examples include glass flakes and hologram pigments.
  • Examples of the curing catalyst include tin octylate, dibutyltin diacetate, Butyltin di (2-ethyl hexanoate), diptyl tin dilaurate, dioctyl tin diacetate, dioctyl tin di (2-ethyl hexanoate), dibutyl tin oxide, dioctyl tin oxide, dibutyl tin fatty acid salt, 2-ethyl hexane Organometallic compounds such as lead acid, zinc octylate, zinc naphthenate, fatty acid zinc, cobalt naphthenate, calcium octylate, copper naphthenate,
  • the amount of the curing catalyst is based on 100 parts by mass of the total solid content of the hydroxyl group-containing resin (a) and the polyisocyanate compound (b). In general, it can be in the range of 0.001 to 2 parts by mass, preferably 0.005 to 0.5 parts by mass, and more preferably 0.01 to 0.1 parts by mass. .
  • the coating composition of the present invention may be in the form of a one-component paint or a multi-component paint.
  • the hydroxyl group-containing resin (a) is used.
  • a two-component paint comprising a main component contained and a curing agent component containing the polyisocyanate compound (b) is preferred.
  • the main agent further preferably contains a pigment, a curing catalyst and a solvent
  • the curing agent component further preferably contains a solvent.
  • the coating composition of the present invention may be in any form of an organic solvent-type paint and a water-based paint, but is preferably an organic solvent-type paint from the viewpoint of storage stability.
  • the water-based paint is a paint whose main component is water
  • the organic solvent-type paint is a paint containing substantially no water as a solvent.
  • the coating composition of the present invention described above is applied as the first colored coating (A) on the substrate by a method known per se, for example, air spray, airless spray, rotary atomizing coating machine or the like. Electrostatic application may be performed during painting.
  • the coating film thickness is a cured film thickness, and is usually 10 to: ⁇ ⁇ , preferably 10 to 50 / _tm, and more preferably 15 to 35 zm.
  • the coating composition of the present invention can be applied on a coating object in which a metal member formed with an undercoat film of various electrodeposition coatings and a plastic member such as a bumper are integrated as necessary.
  • a metal member formed with an undercoat film of various electrodeposition coatings and a plastic member such as a bumper are integrated as necessary.
  • the aqueous second colored paint (B) is applied onto the first colored coating film formed by the above step (1).
  • the coating of the water-based second colored paint (B) is generally from 70 to 100% by mass in terms of the solid content of the first colored paint film from the viewpoint of suppression of sagging and smoothness of the resulting paint film.
  • the gel fraction of the first colored coating film is generally 0 to 70% by mass, It is particularly preferable to carry out the reaction while being in the range of 0.01 to 30% by mass, more particularly 1 to 20% by mass, and even more particularly 3 to 10% by mass.
  • the solid content and the gel fraction of the first colored coating film can be adjusted by, for example, preheating (preheating), air blowing, etc.
  • the preheating is usually performed at a temperature of about 50 ° C. to about 110 ° C., preferably about 60 ° C. to about 80 ° C., in a drying furnace for the article coated with the first colored paint (A).
  • a drying furnace for the article coated with the first colored paint (A).
  • the above-mentioned air procedure is usually performed by spraying air heated to normal temperature or a temperature of about 25 ° C. to about 80 ° C. on the surface to be coated. You can.
  • the solid content of the first colored coating film can be measured by the following method: First, at the same time that the coating composition of the present invention is applied to the object to be coated, the mass (WJ is measured in advance). The coating composition of the present invention is also coated on the aluminum foil, and preheating is performed as necessary. After that, the aluminum foil is collected immediately before the water-based second colored paint (B) is applied to the object to be coated, and its mass (W 2 ) is measured. Next, the collected aluminum foil is dried at 110 ° C. for 60 minutes, allowed to cool to room temperature in a desiccator, and then the mass (W 3 ) of the aluminum foil is measured. Find the rate.
  • Solid content (mass%) ⁇ (W 3 -W,) / (W 2 -W x ) ⁇ X 1 0 0
  • the gel fraction of the first colored coating film can be measured by the following method: First, at the same time that the coating composition of the present invention is applied to an article to be coated, the coating composition of the present invention is also applied to a polypropylene plate. After the composition is applied and preheated as necessary, the polypropylene plate is recovered just before the aqueous second colored paint (B) is applied to the article to be coated. The first colored coating film was collected and the mass (W a ) was measured. After that, the coating film was put in a mesh container made of 20-mesh stainless steel, extracted while refluxing in aceton heated to 64 ° C. for 5 hours, and dried at 110 ° C. for 60 minutes. after the coating mass (W b) was measured, insoluble coating film residual ratio obtained according to the following equation (mass. / 0) and the gel fraction.
  • the water-based second colored paint (B) for example, those known per se that are usually used in the coating of automobile bodies can be used.
  • a base resin such as an acrylic resin, a polyester resin, an alkyd resin, a urethane resin, or an epoxy resin having a crosslinkable functional group such as a carboxyl group or a hydroxyl group, and a polyisocyanate that may be blocked.
  • a compound obtained by dissolving or dispersing a crosslinking agent such as a compound, a melamine resin or a urea resin in water together with a pigment or other additives.
  • a thermosetting water-based paint comprising a hydroxyl group-containing resin and a melamine resin is preferable.
  • the pigment in addition to the colored pigment and extender pigment exemplified in the description of the coating composition of the present invention, it is possible to use a glitter pigment, etc.
  • a metallic or pearly coating can be formed.
  • bright pigments include non-leafing or leafing aluminum (including vapor-deposited aluminum), copper, zinc, brass, nickel, aluminum oxide, mica, titanium oxide and iron oxide. And mica coated with coated aluminum oxide, titanium oxide and iron oxide.
  • the above luster pigments can be used alone or in combination of two or more.
  • the glitter pigment is preferably in the form of flakes, has a longitudinal dimension of 1 to 100 ⁇ m, particularly 5 to 40 ⁇ , and a thickness of 0.0 to 5 ⁇ , particularly 0. A range of 0 0 1-2 ⁇ is suitable.
  • the amount of the glittering pigment is 100 parts by mass of the resin solid content in the water-based second colored paint ( ⁇ ).
  • the aqueous second colored paint () preferably further contains a hydrophobic solvent.
  • the hydrophobic solvent is an organic solvent having a mass dissolved in 100 g of water at 20 ° C. of 10 g or less, preferably 5 g or less, more preferably 1 g or less.
  • an alcohol solvent is preferably used from the viewpoint of smoothness and sharpness of the resulting multilayer coating film.
  • alcohol solvents having 7 to 14 carbon atoms such as n-octanol, 2-octanol, 2-ethyl-1-hexanol, ethylene glycolenomono-2-ethylhexyl etherenole, propylene glycolenomono n —Butyl ether, dipropylene glycol mono- n- butyl ether are particularly preferred.
  • the amount of the hydrophobic solvent is generally based on 100 parts by mass of the resin solid content in the aqueous second colored paint (B).
  • the amount can be in the range of 2 to 70 parts by mass, preferably 5 to 50 parts by mass, and more preferably 10 to 40 parts by mass.
  • the water-based second colored paint (B) can be used for ordinary paints such as curing catalysts, UV absorbers, light stabilizers, antifoaming agents, plasticizers, organic solvents, surface conditioners, and anti-settling agents.
  • Each additive can be contained alone or in combination of two or more.
  • the water-based second colored paint (B) can be applied by a method known per se, for example, air spray, airless spray, rotary atomizing coating machine, and the like. Moyore.
  • the coating film thickness can be in the range of usually 5 to 40 ⁇ , preferably 10 to 30 ⁇ m in terms of cured film thickness.
  • the clear paint (C) is applied from the viewpoint of sagging suppression and smoothness of the resulting coating film.
  • the solid content of the second colored coating film is generally 70 to 100% by mass, particularly 80 to 100% by mass, more particularly 90 to 100% by mass. / 0 and it is preferable to perform while in the range of, also, from the viewpoint of smoothness of resulting coating film, the gel fraction of the second colored coating film, generally 0-7 0% by weight, in particular 0 It is preferable to carry out the treatment while it is in the range of 0 to 30% by mass, more particularly 1 to 15% by mass.
  • the solid content and the gel fraction of the second colored coating film can be adjusted by, for example, preheating (preheating), air blowing, etc. before applying the tarry paint (C).
  • the preheating is usually performed at a temperature of about 50 ° C. to about 110 ° C. in the drying furnace in which the water-based first colored paint (A) and the water-based second colored paint (B) are applied, preferably about A temperature of 60 to about 90 ° C. for about 30 seconds to about 60 minutes, preferably about 1 to about 15 minutes, more preferably about 2 to about 10 minutes, particularly preferably about 3 to It can be performed by heating directly or indirectly for about 5 minutes, and the air blow is usually applied to the coated surface of the object at room temperature or a temperature of about 25 ° C to about 80 ° C. This can be done by blowing heated air.
  • the solid content of the second colored coating film can be measured by the following method: First, at the same time that the aqueous second colored paint (B) is applied on the first colored coating film, the mass ( After coating the water-based second colored paint (B) on the aluminum foil that has been measured for W 4 ), and preheating as necessary, the tariya paint (C) The aluminum foil is collected immediately before the coating is applied, and its mass (W 5 ) is measured. Next, the collected aluminum foil was dried at 110 ° C for 60 minutes, allowed to cool to room temperature in a desiccator, and then the mass (W 6 ) of the aluminum foil was measured. Find the rate.
  • Solid content (mass%) ⁇ (W 6 -W 4 ) / (W 5 -W 4 ) ⁇ XI 0 0
  • the gel fraction of the second colored coating film can be measured by the following method: First, the aqueous second colored paint (B) is coated on the first colored coating film, and at the same time on the polypropylene plate. After applying the water-based second colored paint (B) and preheating as necessary, the polypropylene plate is recovered immediately before the clear paint (C) is applied on the second colored paint film. In addition, The second colored coating film on the polypropylene plate is collected and the mass (W c ) is measured. Then, the coated film is put into a 20 mesh stainless steel mesh container, extracted while refluxing for 5 hours in a aceton heated to 64 ° C, and dried at 110 ° C for 60 minutes. The coating film mass (W d ) after measurement is measured, and the insoluble coating film remaining rate (mass%) obtained according to the following formula is defined as the gel fraction.
  • talya paint (C) for example, those known per se that are usually used in the painting of automobile bodies can be used.
  • a base resin such as an acrylic resin, a polyester resin, an alkyd resin, a urethane resin, an epoxy resin, or a fluororesin having a crosslinkable functional group such as a hydroxyl group, a carboxyl group, an epoxy group, or a silanol group.
  • Melamine resin, urea resin, polyisocyanate compound which may be blocked, carboxyl group-containing compound or resin, epoxy group-containing compound or resin-containing organic solvent-based thermosetting paint, aqueous heat A curable coating, a thermosetting powder coating, or the like can be used.
  • thermosetting paint containing a hydroxyl group-containing acrylic resin and a melamine resin a thermosetting paint containing a hydroxyl group-containing acryl resin and an optionally blocked polyisocyanate compound, or a carboxyl group-containing resin.
  • thermosetting paint comprising an epoxy group-containing resin is particularly preferred.
  • the clear paint (C) may be in the form of a two-part paint such as a one-part paint or a two-part urethane resin paint.
  • the tariya paint (C) can contain coloring pigments, bright pigments, dyes, etc. to the extent that transparency is not hindered.
  • extender pigments, UV absorbers, antifoaming agents, A sticking agent, an antifungal agent, a surface conditioner and the like can be appropriately contained.
  • the tariya paint (C) is applied to the coating surface of the water-based second colored paint (B) formed in step (2) by a method known per se, for example, airless spray, air spray, rotary atomizer, etc. It can be painted and electrostatic application may be applied during painting. Talia paint (C) is applied so that the cured film thickness is in the range of 10 to 60 ⁇ , preferably 25 to 50 ⁇ m. can do. Process (4)
  • a multi-layer coating film composed of three layers of the first colored coating film, the second colored coating film, and the clear coating film formed as described above can be obtained, for example, by a conventional coating film baking means.
  • Example 170 ° C preferably about 120 to about 160 ° C by hot air heating, infrared heating, high frequency heating, etc.
  • Aqualon KH-10 Polyoxyethylene alkyl ether sulfate ester rumonmonium salt: 97% active ingredient manufactured by Daiichi Kogyo Seiyaku Co., Ltd.
  • Monomer emulsion (1) 42 parts of deionized water, Aqualon KH—10 0.72 parts, 2.1 parts of arylmethacrylate, 2.8 parts of styrene, 16 ⁇ 1 ⁇ of methylmethacrylate, 28 parts of ethylacrylate 21 parts of n-butyl acrylate was mixed and stirred to obtain a monomer monoemulsion (1).
  • Monomer emulsion (2) Deionized water 18 parts, Aqualon KH-10 0.13 parts, Ammonium persulfate 0 ⁇ 03 parts, Methacrylic acid 5.1 parts, 2-Hydroxychetyl acrylate 5.1 parts, Styrene 3 parts, Methyl methacrylate 6 parts, Ethyl acrylate 1. 8 parts and ⁇ _Ptyl attaly 9 parts of the rate was mixed and stirred to obtain a monomer emulsion (2).
  • Phosphate group-containing resin solution In a reaction vessel equipped with a thermometer, thermostat, stirrer, reflux condenser and dropping device, a mixed solvent of 27.5 parts of methoxypropanol and 27.5 parts of isobutanol And heated to 110 ° C, 25 parts of styrene, 27.5 parts of n-butyl methacrylate, “Isostearyl acrylate” (trade name, manufactured by Osaka Organic Chemical Industry Co., Ltd., branched higher alkyl acrylate) 20 Part, 4-hydroxypropyl acrylate 7.5 parts, phosphate group-containing polymerizable monomer (Note 3) 15 parts, 2-methacryloylchuccino rare acid phosphate 12.5 parts, isoptanol Mix of 4 parts of t-butyl peroxy tanoate 12 1.
  • Phosphoric acid group-containing polymerizable monomer In a reaction vessel equipped with a thermometer, thermostat, stirrer, reflux cooler and dripping device, 57.5 parts of monoptyl phosphoric acid and Isov 'After adding 41 parts of ethanol and raising the temperature to 90 ° C, 42.5 parts of glycidyl methacrylate was added dropwise over 2 hours, followed by stirring and aging for another hour. Thereafter, 59 parts of isopropanol was added to obtain a phosphate group-containing polymerizable monomer solution having a solid content concentration of 50%. The acid value due to the phosphoric acid group was 285 mg KOH / g. Production of first colored paint (A)
  • the blending ratio of the first colored paint shown in Table 2 is the solid content mass ratio of each component.
  • pigment component when blending the pigment component, add 42 parts of the hydroxyl group-containing resin solution in the first colored paint (25 parts of resin solids) and 7 parts of xylene to the amount of pigment shown in Table 2 and mix. Paint Shaker The mixture was dispersed for 30 minutes to obtain a pigment dispersion paste, which was then stirred and mixed with other components.
  • the polyisocyanate compounds (b-1) to (b-3) in Table 2 below, The compounds (c-1) to (c_6), silicon dioxide (d-1) to (d-3), and pigments (P-1) to (P-3) are as follows.
  • Polyisocyanate (b-3) Dice module Z 4470 (trade name, manufactured by Sumika Bayer Urethane Co., Ltd., Isophoronate of isophorone disiocyanate, solid content 70%, NC 0 content 11.7%) .
  • Polyol compound (c—1) Kuraray Polyol P-510 (trade name, manufactured by Kuraren clay, polyester polyol, number average molecular weight 500).
  • Polyol compound (c 1 2) Kuraray polyether P-101 1 (trade name, manufactured by Kuraray Co., Ltd., polyester polyol, number average molecular weight 1,000).
  • Polyol compound (c_3) Kuraray Polyether F-2010 (trade name, manufactured by Kuraray Co., Ltd., polyester polyol, number average molecular weight 2,000).
  • Polyol compound (c-4) Ade force polyether P_1000 (trade name, manufactured by Asahi Denka Kogyo Co., Ltd., polyether polyol, number average molecular weight 1,000).
  • Polyol compound (c 1 5) UH-CARB 50 (trade name, manufactured by Ube Industries, polycarbonate polyol, number average molecular weight 500).
  • Polyol compound (c_6) T-56 50 J (trade name, manufactured by Asahi Kasei Chemicals Corporation, polycarbonate polyol, number average molecular weight 800).
  • Pigment (P-1) JR-806 (trade name, manufactured by Tika, rutile titanium dioxide).
  • Pigment (P-2) MI CRO ACE S-3 (trade name, manufactured by Nippon Talc Co., Ltd.).
  • Pigment (P-3) Carbon MA-100 (trade name, manufactured by Mitsubishi Chemical Corporation, carbon black).
  • the obtained first colored paints (A-1) to (A-27) were coated on a polypropylene plate so as to have a cured film thickness of 30; um, and heated at 70 for 5 minutes. gel fraction (G 7.), and curing S ⁇ on a polypropylene plate was applied to a 30 ⁇ , the gel fraction of the coating film after heating for 10 minutes at 90 ° C (G 9.)
  • the measurement results are shown in Table 2.
  • Electron GT-1 0 (trade name, manufactured by Kansai Paint Co., Ltd., cationic electrodeposition paint) is electrodeposited onto a cold-rolled steel sheet that has been subjected to zinc phosphate conversion treatment to a cured film thickness of 20 ⁇ . It was cured by heating at 70 ° C for 30 minutes to obtain a test article.
  • Example 25
  • the first colored paint (A-1) obtained in Example 1 above was applied to the above-mentioned test object, respectively, using a rotary atomizing coating machine. Using this coating, the film thickness was 30 ⁇ and the coating was preheated at 70 ° C for 5 minutes.
  • the water-based second colored paint (B-1) obtained in Production Example 10 is applied on the first colored coating film using a rotary atomizing coating machine so as to have a dry film thickness of 15 111. And preheated at 80 for 10 minutes.
  • Example 25 the first colored paint (A-1) obtained in Example 1 was changed to the first colored paint (A-2) to (A-27) shown in Table 3 and obtained in Production Example 10.
  • Example 25 is the same as Example 25 except that the water-based second colored paint (B-1) is changed to the water-based second colored paint (B-1) or the water-based second colored paint (B-2) obtained in Production Example 11.
  • a test coated plate was produced in the same manner. Each test plate obtained in Examples 25 to 49 and Comparative Examples 4 to 6 was evaluated by the following test method. Table 3 shows the evaluation results. (Test method)
  • the Long Wa Ve (LW) value is an index of the amplitude of the surface roughness at a wavelength of about 1.2 to 12 mm. The smaller the measured value, the higher the smoothness of the coated surface.
  • the Short Wave (SW) value is an indicator of the amplitude of the surface roughness at a wavelength of about 3 to 1.2 mm. The smaller the measured value, the higher the clearness of the paint surface.

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Abstract

L'invention concerne une composition de revêtement, destinée à être utilisée en tant que première composition de revêtement colorée (A) dans un procédé selon lequel un premier film de revêtement coloré est formé en appliquant une première composition de revêtement colorée (A) sur un objet à enduire, un second film de revêtement coloré est formé en appliquant une seconde composition de revêtement colorée aqueuse (B) sur le premier film de revêtement coloré, un film de revêtement transparent est formé en appliquant une composition de revêtement transparente (C) sur le second film de revêtement coloré, puis le premier film de revêtement coloré, le second film de revêtement coloré et le film de revêtement transparent ainsi formés sont cuits et durcis en même temps afin de former un film de revêtement multicouche. La composition de revêtement contient de 30 à 95 parties en masse d'une résine hydroxylée (a) ayant une valeur acide inférieure ou égale à 15 mgKOH/g et de 5 à 70 parties en masse d'un composé de polyisocyanate (b) pour 100 parties en masse de la teneur en solides de la résine dans la composition de revêtement.
PCT/JP2007/062365 2006-06-16 2007-06-13 Composition de revêtement WO2007145368A1 (fr)

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WO2009014226A2 (fr) * 2007-07-24 2009-01-29 Kansai Paint Co., Ltd. Procédé pour former un film de revêtement multicouche
JP2009286017A (ja) * 2008-05-30 2009-12-10 Pentel Corp メタリック塗装物
WO2010095541A1 (fr) * 2009-02-18 2010-08-26 関西ペイント株式会社 Composition de revêtement à base d'eau et procédé de formation d'un film de revêtement multicouche
JP2011530393A (ja) * 2008-08-12 2011-12-22 関西ペイント株式会社 複層塗膜形成方法
US20120107619A1 (en) * 2009-07-24 2012-05-03 Kansai Paint Co., Ltd. Water-based coating composition and method for forming multilayer coating film
US8592000B2 (en) 2009-01-23 2013-11-26 Kansai Paint Co., Ltd. Multilayer coating film-forming method
US8993673B2 (en) 2009-02-18 2015-03-31 Kansai Paint Co., Ltd. Water-based coating composition and method of forming multilayered coating film
WO2015045562A1 (fr) * 2013-09-30 2015-04-02 Dic株式会社 Résine acrylique modifiée par un polycarbonate, revêtement, et objet moulé en plastique revêtu dudit revêtement
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WO2009014226A3 (fr) * 2007-07-24 2009-05-22 Kansai Paint Co Ltd Procédé pour former un film de revêtement multicouche
WO2009014226A2 (fr) * 2007-07-24 2009-01-29 Kansai Paint Co., Ltd. Procédé pour former un film de revêtement multicouche
US8906465B2 (en) 2007-07-24 2014-12-09 Toyota Jidosha Kabushiki Kaisha Method for forming multilayer coating film
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