WO2013125705A1 - 複層塗膜形成方法、及び塗装物品 - Google Patents
複層塗膜形成方法、及び塗装物品 Download PDFInfo
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- WO2013125705A1 WO2013125705A1 PCT/JP2013/054606 JP2013054606W WO2013125705A1 WO 2013125705 A1 WO2013125705 A1 WO 2013125705A1 JP 2013054606 W JP2013054606 W JP 2013054606W WO 2013125705 A1 WO2013125705 A1 WO 2013125705A1
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- WIPO (PCT)
- Prior art keywords
- group
- coating
- uncured
- parts
- polyisocyanate compound
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Classifications
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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
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/10—Homopolymers or copolymers of methacrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/02—Emulsion paints including aerosols
- C09D5/024—Emulsion paints including aerosols characterised by the additives
-
- 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.]
Definitions
- the present invention relates to a multilayer coating film forming method and a coated article formed by the method.
- a primer coating (intermediate coating) is applied to an object to be coated (such as an electrodeposition coated steel plate or plastic), and then formed by heating. Curing the applied uncured primer coating, (ii) applying a base coat paint on the primer coating to form an uncured base coat coating, and (iii) an uncured base coat coating.
- 3 coatings 2 including: a step of applying a clear coating thereon to form an uncured clear coating film; and (iv) a step of curing the uncured base coat film and the uncured clear coating film by heating.
- a bake method is known.
- a method for forming a multilayer coating film in an automobile body or an automobile part (i) a step of applying a primer coating to an object and curing the formed uncured primer coating by heating, (ii) a primer A two-coat two-bake method (coating the paint), which includes a step of applying a top coat on the coating film to form an uncured top coat film, and (iii) a step of curing the uncured top coat film by heating.
- a preheating (preheating) step may also be included later).
- the 3-coat 2-bake method is used when a so-called metallic-colored coating film is formed using a base coat paint containing a bright pigment, and the 2-coat 2-bake method contains a color pigment. It is used when a so-called solid color film such as white or black is formed using a top coating.
- the heating process after painting the primer paint is omitted, and (i) the primer paint is applied to the object to be coated to form an uncured primer coating film.
- a three-coat one-bake method including a step of forming a cured clear coating film and (iv) a step of curing the laminated coating film by heating has been studied.
- a step of applying a primer coating to an object to form an uncured primer coating and (ii) applying a clear coating on the uncured primer coating to form an uncured clear coating.
- a two-coat one-bake method that includes a step of curing the laminated coating film by heating, and (i) applying a base coat paint to the object to be coated to form an uncured base coat coating film.
- a two-coating, one-bake system that includes a preheating (preheating) step after coating the paint is being studied.
- those using water-based paints are particularly required as base coat paints and top coat paints from the viewpoint of suppressing environmental contamination due to volatilization of organic solvents.
- the coating films are mixed with each other, and the smoothness and sharpness of the formed multilayer coating film may be deteriorated.
- top coat paints top coat paints
- plastics which are materials for automobile parts
- a coating material that cures at a temperature lower than the conventional 120 to 160 ° C. and a method for forming a multilayer coating film are required.
- water-based base coat paints water-based top coat paints
- multilayer coating film forming methods when heated at a low temperature, the curing of the multilayer coating film is insufficient, the adhesion of the multilayer coating film, water resistance, etc. May be reduced.
- Patent Document 1 discloses a three-coat one-bake coating film forming method in which an intermediate coating film, a base coating film, and a clear coating film are sequentially formed on a substrate by wet-on-wetting.
- the base coating for forming the base coating and the base coating for forming the base coating film contain an amide group-containing acrylic resin and a curing agent, and the curing agent contained in the intermediate coating is an aliphatic isocyanate-based coating.
- a method for forming a coating film comprising an active methylene block isocyanate is described.
- Patent Document 1 when the aliphatic isocyanate-based active methylene block isocyanate, which is a curing agent, has an average functional group number greater than 3, the amide group-containing acrylic resin exhibits a viscosity control effect.
- the familiarity and reversal at the interface between the respective coating film layers when the three-coating one-bake method is applied are controlled, and further, the curing of the intermediate coating film starts before the base coating film and the clear coating film, Multi-layer coating film that can ensure sufficient flow properties and has excellent surface concealment property against rough skin of electrodeposition coating film, so that it has excellent finished appearance and coating film properties, particularly chipping resistance Is obtained.
- Patent Document 2 describes an aqueous paint composition for a second aqueous paint for forming a multilayer coating film by sequentially applying a first aqueous paint, a second aqueous paint, and a clear paint by wet-on-wet. ing.
- the aqueous coating composition comprises (a) 0.5 to 10% by mass of a polyfunctional vinyl monomer (amount based on all monomer components) per 100 parts by mass of resin solid content in the coating composition, carboxyl group-containing vinyl monomer, hydroxyl group 40 to 60 parts by mass of an emulsion resin obtained by emulsion polymerization of a monomer mixture containing a vinyl-containing monomer and another vinyl polymerizable monomer, (b) 1 to 5 parts by mass of an amide group-containing water-soluble acrylic resin, (c) 5 to 20 parts by mass of a urethane emulsion and (d) 15 to 35 parts by mass of a curing agent are contained.
- Patent Document 2 discloses that the clear coating component penetrates into the lower layer coating when wet-on-wet is applied due to the cross-linking structure in the emulsion particles, that is, a mixed layer between the lower layer coating and the upper layer coating. As a result, it is described that energy can be reduced when forming a multilayer coating film, and a multilayer coating film excellent in appearance and water resistance can be obtained. Patent Document 2 also describes that the second water-based paint is excellent in storage stability due to the inclusion of (b) an amide group-containing water-soluble acrylic resin, (c) a urethane emulsion, and (d) a curing agent. Yes.
- an aqueous primer, an aqueous base coat paint, and a clear coat paint are coated on a plastic substrate, and three layers are simultaneously baked at a temperature of 100 ° C. or lower.
- a water-based base coat paint containing a water-based polyurethane resin, a water-based acrylic resin and / or a water-based polyester resin containing a hydroxyl group, and a melamine resin, wherein the melamine resin is A butyl / methyl mixed etherified melamine resin having a weight average molecular weight in the range of 1500 to 3000, and further comprising a clear coat paint containing a hydroxyl group-containing resin and an isocyanate crosslinking agent, the isocyanate crosslinking agent Has a uretdione structure. If it is intended to include a cyanate compound and a trimer or more compounds of the diisocyanates, adhesion, it is described that can form a water-resistant and durable multilayer coating film.
- an aqueous intermediate coating is formed on a substrate having both a steel plate and a plastic substrate to form an intermediate coating, and an aqueous base coating is applied on the formed intermediate coating.
- an organic solvent-type clear coating is applied to form a clear coating, and the three layers of the intermediate coating, the base coating and the clear coating are heated and cured.
- the appearance of the steel sheet and plastic substrate are described that becomes uniform.
- the storage stability of the active methylene block isocyanate is low, and smoothness and sharpness may be deteriorated, and adhesion may be deteriorated due to insufficient curing.
- the smoothness and freshness of the coating film formed by mixing between the intermediate coating and the aqueous base coat and / or between the aqueous base coat and the clear paint are mixed.
- the picture quality is lowered and the baking temperature is low, water resistance may be lowered due to insufficient curing.
- the coating film forming method described in Patent Document 3 when the thickness of the base coat is large and the thickness of the clear coat is thin, the amount of the polyisocyanate compound transferred from the clear coat paint to the base coat paint and the primer paint is small. Thus, the water resistance may decrease due to insufficient curing.
- the coating film forming method described in Patent Document 4 when the baking temperature is lowered to less than 120 ° C., the base coat film is thickened (30 ⁇ m or more), the clear coating film is thinned (less than 20 ⁇ m), etc. There were times when the coating film was insufficiently cured.
- the present invention provides a multilayer having excellent smoothness, sharpness, adhesion, and water resistance when a plurality of uncured coatings are cured at once, particularly when cured at a low temperature at one time. It is an object of the present invention to provide a multilayer coating film forming method for forming a coating film.
- the first multilayer coating film forming method of the present invention includes the following steps 1-1 to 1-4, Step 1-1: A step of applying an object to be coated with the primer paint (X) to form an uncured primer coating on the object to be coated.
- Step 1-2 A step of coating the object having the uncured primer coating with a water-based colored paint (Y 1 ) for base coat to form an uncured base coat on the coating
- Step 1-3 An object to be coated having the uncured primer coating film and the uncured base coat film is applied with a clear coating (Z), and an uncured clear coating film is formed thereon.
- the aqueous coloring paint (Y 1 ) is a hydroxyl group-containing resin (A) and the following general formula (I): (Wherein R 1 , R 2 , R 4 and R 5 independently represent a hydrocarbon group having from about 1 to about 12 carbon atoms, and R 3 is a straight chain having from about 1 to about 12 carbon atoms) Represents a branched or branched alkylene group)
- the second multilayer coating film forming method of the present invention includes the following steps 2-1, 2-2 and 2-3, Step 2-1: a step of applying an object to be coated with the primer paint (X) to form an uncured primer coating on the object to be coated; Step 2-2: a step of coating the article having the uncured primer coating with a water-based colored paint (Y 2 ) for a top coating, and forming an uncured top coating on the coating; Heating and curing the uncured primer coating and the uncured topcoat;
- a multilayer coating film forming method comprising:
- the aqueous coloring paint (Y 2 ) is a hydroxyl group-containing resin (A), a blocked isocyanate group represented by the above general formula (I), a blocked isocyanate group represented by the above general formula (II), and the above general formula. It contains a blocked polyisocyanate compound (B) having at least one blocked isocyanate group selected from the group consisting of blocked isocyanate groups represented
- the third multilayer coating film forming method of the present invention includes the following steps 3-1, 3-2 and 3-3, Step 3-1: a step of applying a water-based colored paint (Y 1 ) for a base coat to form an uncured base coat film on the substrate; Step 3-2: A step of coating the object having the uncured base coat film with a clear paint (Z) to form a clear film thereon, and Step 3-3: the uncured base coat A method for forming a multilayer coating film comprising the steps of heating and curing the coating film and the uncured clear coating film,
- the aqueous coloring paint (Y 1 ) is a hydroxyl group-containing resin (A), a blocked isocyanate group represented by the above general formula (I), a blocked isocyanate group represented by the above general formula (II), and the above general formula. It contains a blocked polyisocyanate compound (B) having at least one blocked isocyanate group selected from the group consisting of blocked isocyanate groups
- the multi-layer coating film forming method of the present invention has a smoothness, sharpness, adhesion and water resistance when a plurality of uncured coating films are cured at once, particularly when cured at a low temperature at once. Forms a multi-layer coating excellent in
- Step 1 the object to be coated is applied with the primer paint (X) to form an uncured primer coating on the object to be coated.
- the object to be coated includes, for example, an outer plate part of an automobile body such as a passenger car, a truck, a motorcycle, a bus; an automobile part such as a bumper; For example, the outer plate of the product.
- an outer plate part of an automobile body and an automobile part are preferable.
- the material of the object to be coated is not particularly limited.
- Metal materials such as plated steel; polyethylene resin, polypropylene resin, acrylonitrile-butadiene-styrene (ABS) resin, polyamide resin, acrylic resin, vinylidene chloride resin, polycarbonate resin, polyurethane resin, epoxy resin, etc.
- plastic materials such as FRP; inorganic materials such as glass, cement, and concrete; wood; fiber materials such as paper and cloth, and metal materials and plastic materials are preferable.
- the object to be coated may be a metal surface of the metal material and a vehicle body formed from the metal material and subjected to a surface treatment such as a phosphate treatment, a chromate treatment, a complex oxide treatment, and the like.
- a surface treatment such as a phosphate treatment, a chromate treatment, a complex oxide treatment, and the like.
- the to-be-coated object which has a coating film may be sufficient.
- Examples of the coating material having the above coating film include those in which a base material is subjected to surface treatment as desired and an undercoat coating film is formed thereon.
- a vehicle body in which an undercoat film is formed with an electrodeposition paint is preferable, and a vehicle body in which an undercoat film is formed with a cationic electrodeposition paint is more preferable.
- the surface of the article to be coated may be subjected to surface treatment, primer coating, or the like, if desired, on the surface of the plastic material or an automotive part molded from the plastic material. Further, a combination of the plastic material and the metal material may be used.
- Primer paint (X) In Method 1, a known primer coating composition can be used as the primer coating (X).
- the primer paint (X) preferably contains, for example, a film-forming resin, a crosslinking agent, a color pigment, an extender pigment, a glitter pigment, and a solvent.
- primer paint (X) is an ultraviolet absorber, a light stabilizer, a curing catalyst, a plasticizer, an adhesion imparting agent, a compatibilizer, an antifoaming agent, a thickener, a rust preventive, a surface conditioner, etc.
- the paint additive can be contained.
- the film-forming resin examples include acrylic resin, polyester resin, alkyd resin, urethane resin, polyolefin resin, and any combination thereof, and the film-forming resin contains a hydroxyl group. Is preferred.
- the primer coating (X) can contain a crosslinking agent and can contain no crosslinking agent. Further, the primer coating (X) can be crosslinked by soaking the crosslinking agent contained in the upper layer coating film.
- the film forming resin in the primer coating (X) is included in the upper layer coating film. It can contain functional groups capable of reacting with the crosslinking agent.
- a crosslinking agent a melamine resin, a polyisocyanate compound, a blocked polyisocyanate compound etc. are mentioned, for example.
- the primer paint (X) may be either an organic solvent type or an aqueous type, but an aqueous type is preferable from the viewpoint of environmental protection.
- the primer coating (X) can be applied by a known method, for example, air spray coating, airless spray coating, rotary atomization coating, or the like, and electrostatic application may be performed during the coating.
- the primer paint (X) is applied such that its cured film thickness is preferably in the range of about 3 to about 40 ⁇ m, more preferably about 5 to about 30 ⁇ m, and even more preferably about 7 to about 20 ⁇ m.
- step 1-2 an object to be coated having an uncured primer coating is applied with an aqueous colored paint (Y 1 ) for base coating, and an uncured base coating film is formed thereon.
- the uncured primer coating can be preheated (pre-dried) or air blowd under conditions that do not substantially cure the primer coating before applying the aqueous colored paint (Y 1 ).
- the cured coating is a state of “curing and drying” as defined in JIS K 5600-1-1: 1999, that is, the center of the coated surface is strongly sandwiched between the thumb and the index finger and applied. The surface is free from dents due to fingerprints, the movement of the coating film is not felt, and the coating surface is rubbed rapidly with the fingertips to leave no marks on the coating surface.
- an uncured coating film is a state in which the coating film has not reached the above-mentioned cured and dried state, and “touch drying” and “semi-half” defined in JIS K 5600-1-1: 1999. Including “cured and dried”.
- the preheating is preferably about 40 to about 100 ° C., more preferably about 50 to about 90 ° C., and more preferably about 60 ° C. or more and less than about 80 ° C., preferably about 30 seconds to about 15 minutes, More preferably from about 1 to about 10 minutes and even more preferably from about 2 to about 5 minutes.
- the air blowing can be generally performed by blowing air heated to a room temperature or a temperature of about 25 to about 80 ° C. for about 30 seconds to about 15 minutes on the coated surface of the object to be coated.
- the solids concentration of the uncured primer coating is generally about 60 to about 100% by weight, preferably about 80 to about 100% by weight, and more preferably about 90 to about 100% by weight. Can be adjusted within the range.
- the solid content concentration of the coating film is measured by the following method.
- the solid content concentration after preheating of the uncured primer coating will be described as an example.
- the object is coated with the primer paint (X)
- the aluminum foil whose mass (M 1 ) has been measured in advance is also coated.
- the aluminum foil is collected and its mass (M 2 ) is measured.
- the recovered aluminum foil was dried at 110 ° C. for 60 minutes, allowed to cool to room temperature (25 ° C.) in a desiccator, and then the mass (M 3 ) of the aluminum foil was measured.
- Solid content concentration (% by mass) ⁇ (M 3 ⁇ M 1 ) / (M 2 ⁇ M 1 ) ⁇ ⁇ 100
- the water-based colored paint (Y 1 ) comprises (A) a hydroxyl group-containing resin and (B) the following general formula (I): (Wherein R 1 , R 2 , R 4 and R 5 independently represent a hydrocarbon group having from about 1 to about 12 carbon atoms, and R 3 is a straight chain having from about 1 to about 12 carbon atoms) Represents a branched or branched alkylene group)
- the block polyisocyanate compound which has at least 1 sort (s) of blocked isocyanate group selected from the group which consists of block isocyanate group shown by these is contained.
- hydroxyl group-containing resin (A) examples include a hydroxyl group-containing acrylic resin (A 1 ), a hydroxyl group-containing polyester resin (A 2 ), a hydroxyl group-containing polyurethane resin (A 3 ), a hydroxyl group-containing epoxy resin, a hydroxyl group-containing alkyd resin, and the like. Any combination thereof may be mentioned.
- the hydroxyl group-containing resin (A) preferably has a hydroxyl value in the range of 1 to 200 mgKOH / g, more preferably 5 to 150 mgKOH / g, and even more preferably 10 to 100 mgKOH / g.
- the hydroxyl group-containing resin (A) can have an acid group such as a carboxyl group.
- the hydroxyl group-containing resin (A) has an acid group such as a carboxyl group
- the hydroxyl group-containing resin (A) is preferably about 0.1 to about 55 mgKOH / g, more preferably about 3 to about 50 mgKOH / g, More preferably, it has an acid value in the range of about 7 to about 45 mg KOH / g.
- the hydroxyl group-containing resin (A) includes a hydroxyl group-containing acrylic resin (A 1 ), a hydroxyl group-containing polyester resin (A 2 ), and the like from the viewpoints of smoothness, sharpness, water resistance, and the like of the formed multilayer coating film. It is preferable to be selected from the group consisting of these combinations, and it is more preferable that both the hydroxyl group-containing acrylic resin (A 1 ) and the hydroxyl group-containing polyester resin (A 2 ) are included.
- the hydroxyl group-containing acrylic resin (A 1 ) and the hydroxyl group-containing polyester resin (A 2 ) are preferably about 10 to about 90% by weight and about 10 to about 90% by weight, and more preferably about 20 to about 80%, respectively, based on the total weight of their solids. And in the range of about 20 to about 80% by weight.
- the hydroxyl group-containing acrylic resin (A 1 ) is, for example, a hydroxyl group-containing polymerizable unsaturated monomer (a 1 ) and another polymerizable unsaturated monomer (a 1 ) copolymerizable with the hydroxyl group-containing polymerizable unsaturated monomer (a 1 ). 2 ) (hereinafter referred to as “other polymerizable unsaturated monomer (a 2 )”) is a known method such as solution polymerization in an organic solvent, emulsion polymerization in water, mini in water It can manufacture by copolymerizing by methods, such as an emulsion polymerization method.
- the hydroxyl group-containing polymerizable unsaturated monomer (a 1 ) is a compound having at least one hydroxyl group and one polymerizable unsaturated bond in one molecule.
- Examples of the hydroxyl group-containing polymerizable unsaturated monomer (a 1 ) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth).
- Monoesterified product of (meth) acrylic acid such as acrylate and dihydric alcohol having about 2 to about 8 carbon atoms
- monoesterified product of (meth) acrylic acid and dihydric alcohol having about 2 to about 8 carbon atoms ⁇ -caprolactone modified product
- N-hydroxymethyl (meth) acrylamide allyl alcohol, (meth) acrylate having a polyoxyethylene chain whose molecular end is a hydroxyl group, and any combination thereof.
- Examples of the other polymerizable unsaturated monomer (a 2 ) that can be copolymerized with the hydroxyl group-containing polymerizable unsaturated monomer (a 1 ) include the following monomers (i) to (xix) and any combination thereof: Can be mentioned.
- Alkyl or cycloalkyl (meth) acrylate For example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, tridecyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, isostearyl (Meth) acrylate, cyclohexyl (meth) acrylate, methylcyclohexyl (meth) acrylate,
- polymerizable unsaturated monomers having an alkoxysilyl group vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, ⁇ -(Meth) acryloyloxypropyltrimethoxysilane, ⁇ - (meth) acryloyloxypropyltriethoxysilane, etc.
- a polymerizable unsaturated monomer having a fluorinated alkyl group Perfluoroalkyl (meth) acrylates such as perfluorobutylethyl (meth) acrylate and perfluorooctylethyl (meth) acrylate; fluoroolefins (viii) polymerizable unsaturated monomers having a photopolymerizable functional group such as maleimide group
- ( ix) Vinyl compounds N-vinylpyrrolidone, ethylene, butadiene, chloroprene, vinyl propionate, vinyl acetate, etc.
- (Xii) a polymerizable unsaturated monomer having two or more polymerizable unsaturated groups in one molecule: Allyl (meth) acrylate, 1,6-hexanediol di (meth) acrylate, etc.
- Epoxy group-containing polymerizable unsaturated monomer Glycidyl (meth) acrylate, ⁇ -methylglycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, 3,4-epoxycyclohexylethyl (meth) acrylate, 3,4-epoxycyclohexylpropyl (meth) acrylate , Allyl glycidyl ether, etc.
- Xiv a polymerizable unsaturated monomer having a (meth) acrylate
- xv sulfonic acid group having a polyoxyethylene chain whose molecular end is an alkoxy group: 2-acrylamido-2-methylpropanesulfonic acid, 2-sulfoethyl (meth) acrylate, allylsulfonic acid, 4-styrenesulfonic acid, etc .; sodium salts and ammonium salts of these sulfonic acids, etc.
- a polymerizable unsaturated monomer having a phosphate group Acid phosphooxyethyl (meth) acrylate, acid phosphooxypropyl (meth) acrylate, acid phosphooxypoly (oxyethylene) glycol (meth) acrylate, acid phosphooxypoly (oxypropylene) glycol (meth) acrylate, etc.
- (Xvii) a polymerizable unsaturated monomer having a UV-absorbing functional group: 2-hydroxy-4- (3-methacryloyloxy-2-hydroxypropoxy) benzophenone, 2-hydroxy-4- (3-acryloyloxy-2-hydroxypropoxy) benzophenone, 2,2′-dihydroxy-4- (3- Methacryloyloxy-2-hydroxypropoxy) benzophenone, 2,2′-dihydroxy-4- (3-acryloyloxy-2-hydroxypropoxy) benzophenone, 2- (2′-hydroxy-5′-methacryloyloxyethylphenyl) -2H -Benzotriazole, etc.
- UV-stable polymerizable unsaturated monomer 4- (meth) acryloyloxy-1,2,2,6,6-pentamethylpiperidine, 4- (meth) acryloyloxy-2,2,6,6-tetramethylpiperidine, 4-cyano-4- (meta ) Acryloylamino-2,2,6,6-tetramethylpiperidine, 1- (meth) acryloyl-4- (meth) acryloylamino-2,2,6,6-tetramethylpiperidine, 1- (meth) acryloyl- 4-cyano-4- (meth) acryloylamino-2,2,6,6-tetramethylpiperidine, 4-crotonoyloxy-2,2,6,6-tetramethylpiperidine, 4-crotonoylamino-2, 2,6,6-tetramethylpiperidine, 1-crotonoyl-4-crotonoyloxy-2,2,6,6-tetramethylpiperidine, etc.
- (Xix) polymerizable unsaturated monomer having a carbonyl group Acrolein, diacetone acrylamide, diacetone methacrylamide, acetoacetoxyethyl methacrylate, formylstyrene, vinyl alkyl ketone having about 4 to about 7 carbon atoms (for example, vinyl methyl ketone, vinyl ethyl ketone, vinyl butyl ketone), etc.
- polymerizable unsaturated group means an unsaturated group capable of radical polymerization.
- examples of the polymerizable unsaturated group include a vinyl group and a (meth) acryloyl group.
- (meth) acrylate means acrylate and / or methacrylate.
- (Meth) acrylic acid means acrylic acid and / or methacrylic acid.
- (Meth) acryloyl means acryloyl and / or methacryloyl.
- (Meth) acrylamide means acrylamide and / or methacrylamide.
- the proportion of the hydroxyl group-containing polymerizable unsaturated monomers in the preparation of hydroxy-containing acrylic resin (A 1) (a 1), based on the total amount of monomer components, is preferably from about 0.5 to about 50 wt%, about 1.0 to about 40% by mass is more preferable, and about 1.5 to about 30% by mass is more preferable.
- the hydroxyl group-containing acrylic resin (A 1 ) preferably has a hydroxyl value of about 1 to about 200 mgKOH / g, from about 5 to about 150 mgKOH / g, from the viewpoint of water resistance of the multilayer coating film to be formed. More preferred is about 10 to about 100 mg KOH / g.
- the hydroxyl group-containing acrylic resin (A 1 ) is preferably about 0.1 to about 55 mg KOH / g, from the viewpoint of storage stability of the paint, and the sharpness and water resistance of the formed multilayer coating film. Preferably it has an acid number of 3 to 50 mg KOH / g, and more preferably 5 to 45 mg KOH / g.
- the hydroxyl group-containing acrylic resin (A 1 ) is a hydroxyl group-containing acrylic resin aqueous dispersion (A) as at least one kind from the viewpoint of improving the smoothness, sharpness and water resistance of the multilayer coating film to be formed. 11 ) is preferably contained.
- Hydroxyl group-containing acrylic resin water dispersion for example, hydroxyl-containing polymerizable unsaturated monomer (a 1) and a hydroxyl group-containing polymerizable unsaturated monomer (a 1) copolymerizable with the polymerizable unsaturated monomer (A 2 ) can be produced by copolymerization by a known method such as an emulsion polymerization method in water or a miniemulsion polymerization method in water.
- the hydroxyl group-containing acrylic resin in the hydroxyl group-containing acrylic resin aqueous dispersion (A 11 ) is preferably from about 1 to about 200 mg KOH / g, more preferably from about 5 to 5 from the viewpoint of water resistance of the formed multilayer coating film. It has a hydroxyl value of about 150 mg KOH / g, and more preferably about 10 to about 100 mg KOH / g.
- the hydroxyl group-containing acrylic resin in the hydroxyl group-containing acrylic resin aqueous dispersion (A 11 ) can have an acid group such as a carboxyl group.
- the hydroxyl group-containing acrylic resin in the aqueous hydroxyl group-containing acrylic resin dispersion (A 11 ) improves the storage stability of the paint, the smoothness of the formed multilayer coating film, the sharpness, and the water resistance.
- the acid value is preferably from about 0.1 to about 55 mg KOH / g, more preferably from about 3 to about 50 mg KOH / g, and even more preferably from about 7 to about 45 mg KOH / g.
- the hydroxyl group-containing acrylic resin aqueous dispersion (A 11 ) is a core-shell type aqueous dispersion from the viewpoint of smoothness, sharpness, adhesion and water resistance of the formed multilayer coating film. Is preferred.
- the core / shell type hydroxyl group-containing acrylic resin aqueous dispersion include a polymerizable unsaturated monomer (I 1 ) (hereinafter referred to as “monomer (I 1 )”) having two or more polymerizable unsaturated groups in one molecule.
- a polymerizable unsaturated monomer (I 2 ) having one polymerizable unsaturated group in one molecule (hereinafter sometimes referred to as “monomer (I 2 )”) as a copolymerization component.
- a copolymer (I) as a core part (hereinafter sometimes referred to as “core part copolymer (I)”), a hydroxyl group-containing polymerizable unsaturated monomer (II 1 ), a carboxyl group-containing polymerizable monomer, Copolymer (II) as a shell part comprising a saturated monomer (II 2 ) and other polymerizable unsaturated monomer (II 3 ) as a copolymerization component, hereinafter referred to as “shell part copolymer (II)” Core / shell type hydroxyl group consisting of It is preferably a perforated acrylic resin water dispersion (A 111).
- Examples of the polymerizable unsaturated monomer (I 1 ) having two or more polymerizable unsaturated groups in one molecule that form the core copolymer (I) include allyl (meth) acrylate, ethylene glycol di ( (Meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, 1,4-butanediol di (Meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tetra (meth) acrylate, glycerol di (meth) acrylate, 1 , 1,1-Tris Droxymethyle
- the polymerizable unsaturated monomer (I 1 ) having two or more polymerizable unsaturated groups in one molecule has a function of imparting a crosslinked structure to the core copolymer (I).
- the core copolymer (I) is a polymerizable unsaturated monomer having two or more polymerizable unsaturated groups in one molecule based on the total mass of the copolymer components constituting the core copolymer (I).
- (I 1 ) as a copolymerization component is preferably from about 0.05 to about 20% by weight, more preferably from about 0.1 to about 10% by weight, and even more preferably from about 0.2 to about 7% by weight. Include in range.
- the polymerizable unsaturated monomer (I 2 ) having one polymerizable unsaturated group in one molecule that forms the core copolymer (I) has two or more polymerizable unsaturated groups in one molecule. It is a polymerizable unsaturated monomer copolymerizable with the polymerizable unsaturated monomer (I 1 ).
- polymerizable unsaturated monomer (I 2 ) having one polymerizable unsaturated group per molecule include, for example, the hydroxyl group-containing polymerizable unsaturated described in the description of the hydroxyl group-containing acrylic resin (A 1 ).
- a polymerizable unsaturated monomer (I 1 having two or more polymerizable unsaturated groups in one molecule) I) to (xi), (xiii) to (xix), and the like, as well as any combination thereof.
- a polymerizable unsaturated monomer (I 2 ) having one polymerizable unsaturated group in one molecule is at least one of the hydrophobic polymerizable monomers. It is preferable to contain an unsaturated monomer.
- the hydrophobic polymerizable unsaturated monomer is a polymer having a linear, branched or cyclic saturated or unsaturated hydrocarbon group having about 4 or more carbon atoms, preferably about 6 to about 18 carbon atoms.
- Monomer having a hydrophilic group such as a hydroxyl group-containing polymerizable unsaturated monomer is excluded.
- hydrophobic polymerizable unsaturated monomer examples include n-butyl (meth) acrylate, isobutyl (meth) acrylate, tert-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) ) Acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, tridecyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate, cyclohexyl (meth) acrylate, methylcyclohexyl Alkyl or cyclo, such as (meth) acrylate, tert-butylcyclohexyl (meth) acrylate, cyclododecyl (meth) acrylate,
- the hydrophobic polymerizable unsaturated monomer is selected from the group consisting of n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and styrene. At least one polymerizable unsaturated monomer is preferred.
- the hydrophobicity is determined based on the total mass of the copolymer components constituting the core copolymer (I).
- the polymerizable polymerizable unsaturated monomer is preferably contained as a copolymerization component in an amount of about 5 to about 90% by weight, more preferably about 20 to about 85% by weight, and still more preferably about 40 to about 75% by weight. This is from the viewpoint of excellent stability of the core / shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) and smoothness, sharpness and water resistance of the resulting coating film.
- the core copolymer (I) may not contain the monomer (I 1 ).
- the core copolymer (I) May be formed from the monomer (I 2 ).
- the shell part copolymer (II) includes, as copolymerization components, a hydroxyl group-containing polymerizable unsaturated monomer (II 1 ), a carboxyl group-containing polymerizable unsaturated monomer (II 2 ), and other polymerizable unsaturated monomers ( II 3 ).
- the hydroxyl group-containing polymerizable unsaturated monomer (II 1 ) that forms the shell copolymer (II) is a core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ).
- Examples of the hydroxyl group-containing polymerizable unsaturated monomer (II 1 ) include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth).
- Monoesterified product of (meth) acrylic acid such as acrylate and dihydric alcohol having about 2 to about 8 carbon atoms
- the hydroxyl group-containing polymerizable unsaturated monomer (II 1 ) includes 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, and It is preferably selected from the group consisting of any combination thereof, and more preferably 2-hydroxyethyl (meth) acrylate.
- the shell copolymer (II) is preferably a hydroxyl group-containing polymerizable unsaturated monomer (II 1 ) as a copolymer component based on the total mass of the copolymer components constituting the shell copolymer (II). Is in the range of about 1 to about 40% by weight, more preferably about 5 to about 30% by weight, and even more preferably about 10 to about 25% by weight. This is from the viewpoint of excellent stability of the core / shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) and excellent water resistance of the resulting coating film.
- the carboxyl group-containing polymerizable unsaturated monomer (II 2 ) is preferably selected from the group consisting of acrylic acid and methacrylic acid, and combinations thereof.
- the shell portion contains the carboxyl group-containing polymerizable unsaturated monomer (II 2 ) as a copolymerization component, the stability of the obtained core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) is secured.
- the shell part copolymer (II) is based on the total mass of the copolymer components constituting the shell part copolymer (II), and the carboxyl group-containing polymerizable unsaturated monomer (II 2 ) is used as a covalent synthesis component. Preferably from about 0.1 to about 30% by weight, more preferably from about 2 to about 25% by weight, and even more preferably from about 3 to about 19% by weight. This is from the viewpoint of excellent stability of the core / shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) and excellent water resistance of the resulting coating film.
- the other polymerizable unsaturated monomer (II 3 ) forming the shell copolymer (II) is other than the hydroxyl group-containing polymerizable unsaturated monomer (II 1 ) and the carboxyl group-containing polymerizable unsaturated monomer (II 2 ).
- the polymerizable unsaturated monomer is other than the hydroxyl group-containing polymerizable unsaturated monomer (II 1 ) and the carboxyl group-containing polymerizable unsaturated monomer (II 2 ).
- polymerizable unsaturated monomers (II 3 ) include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, Isobutyl (meth) acrylate, tert-butyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, nonyl (meth) acrylate, dodecyl (meth) Acrylate, tridecyl (meth) acrylate, stearyl (meth) acrylate, isostearyl (meth) acrylate, cyclohexyl (meth) acrylate, methylcyclohexyl
- the shell part copolymer (II) is an uncrosslinked type without containing two or more polymerizable unsaturated monomers in the molecule.
- the ratio of the core copolymer (I) / shell copolymer (II) depends on the sharpness and glitter of the coating film to be formed. From the viewpoint of improving the solid content, the solid content mass ratio is preferably about 5/95 to about 95/5, more preferably about 50/50 to about 85/15, and about 60/40 to about More preferably, it is 80/20.
- the core / shell type hydroxyl group-containing acrylic resin in the core / shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) is preferably about 1 to from the viewpoint of improving the chipping resistance, water resistance and the like of the resulting coating film. It has a hydroxyl value of about 200 mg KOH / g, more preferably about 5 to about 150 mg KOH / g, and even more preferably about 10 to about 100 mg KOH / g.
- the core / shell type hydroxyl group-containing acrylic resin in the aqueous dispersion of core / shell type hydroxyl group-containing acrylic resin (A 111 ) is used for the storage stability of the paint, as well as the smoothness and sharpness of the formed multilayer coating film.
- the acid value is preferably about 0.1 to about 55 mg KOH / g, more preferably about 3 to about 50 mg KOH / g, and even more preferably about 7 to about 45 mg KOH / g.
- the core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) includes, for example, about 0 to about 20% by mass of a polymerizable unsaturated monomer (I 1 ) having two or more polymerizable unsaturated groups in one molecule. Then, a monomer mixture comprising about 80 to about 100% by mass of a polymerizable unsaturated monomer (I 2 ) having one polymerizable unsaturated group in one molecule is subjected to emulsion polymerization to obtain a copolymer of the core copolymer (I).
- the hydroxyl group-containing polymerizable unsaturated monomer (II 1) from about 1 to about 40 wt%
- the carboxyl group-containing polymerizable unsaturated monomer (II 2) from about 0.1 to about 30
- adding a monomer mixture consisting of about 30% by mass to about 98.9% by mass of the other polymerizable unsaturated monomer (II 3 ) and further emulsion-polymerizing to form a shell copolymer (II). Obtained by.
- the emulsion polymerization for preparing the emulsion of the core copolymer (I) can be performed by a known method.
- the emulsion polymerization can be carried out by adding a polymerization initiator to the mixture of monomers described above in the presence of a surfactant.
- the surfactant examples include anionic surfactants and nonionic surfactants.
- examples of the anionic surfactant include sodium salts such as alkylsulfonic acid, alkylbenzenesulfonic acid, and alkylphosphoric acid, ammonium salts, and the like.
- examples of the nonionic surfactant include polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxyethylene lauryl ether, polyoxyethylene tridecyl ether, polyoxyethylene phenyl ether, and polyoxyethylene nonylphenyl ether.
- Polyoxyethylene octyl phenyl ether polyoxyethylene monolaurate, polyoxyethylene monostearate, polyoxyethylene monooleate, sorbitan monolaurate, sorbitan monostearate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate Etc.
- anionic surfactant a polyoxyalkylene group-containing anionic surfactant having an anionic group and a polyoxyalkylene group such as a polyoxyethylene group or a polyoxypropylene group in one molecule; 1
- the reactive anionic surfactant which has an anionic group and a radically polymerizable unsaturated group in a molecule
- Examples of the reactive anionic surfactant include sodium salts and ammonium salts of sulfonic acid compounds having radically polymerizable unsaturated groups such as allyl group, methallyl group, (meth) acryloyl group, propenyl group, and butenyl group.
- An ammonium salt of a sulfonic acid compound having a radically polymerizable unsaturated group is preferable because the resulting coating film has excellent water resistance.
- Examples of commercially available ammonium salts of the sulfonic acid compound include “Latemul S-180A” (trade name, manufactured by Kao Corporation).
- ammonium salt of a sulfonic acid compound having a radical polymerizable unsaturated group an ammonium salt of a sulfonic acid compound having a radical polymerizable unsaturated group and a polyoxyalkylene group is more preferable.
- examples of commercially available ammonium salts of sulfonic acid compounds having a radically polymerizable unsaturated group and a polyoxyalkylene group include “AQUALON KH-10” (trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), “Latemul PD”. -104 "(trade name, manufactured by Kao Corporation),” ADEKA rear soap SR-1025 "(trade name, manufactured by ADEKA), and the like.
- the surfactant is preferably added to the reaction system in an amount of about 0.1 to about 15% by mass, more preferably about 0.5 to about 10% by mass, based on the total mass of all monomers. More preferably, it is carried out by adding about 1 to about 5% by mass.
- polymerization initiator examples include benzoyl peroxide, octanoyl peroxide, lauroyl peroxide, stearoyl peroxide, cumene hydroperoxide, tert-butyl peroxide, di-tert-amyl peroxide, tert-butyl peroxide.
- Organic peroxides such as -2-ethylhexanoate, tert-butyl peroxylaurate, tert-butyl peroxyisopropyl carbonate, tert-butyl peroxyacetate, diisopropylbenzene hydroperoxide; azobisisobutyronitrile, Azobis (2,4-dimethylvaleronitrile), azobis (2-methylpropiononitrile), azobis (2-methylbutyronitrile), 4,4'-azobis (4-cyano Tanic acid), dimethylazobis (2-methylpropionate), azobis [2-methyl-N- (2-hydroxyethyl) -propionamide], azobis ⁇ 2-methyl-N- [2- (1-hydroxy Butyl)]-propionamide ⁇ , persulfates such as potassium persulfate, ammonium persulfate, sodium persulfate, and the like, and any combination thereof. Further, if desired, a reducing agent such as sugar
- the polymerization initiator is preferably added in an amount of about 0.1 to about 5% by mass, and more preferably about 0.2 to about 3% by mass, based on the total mass of all monomers. It is carried out by doing.
- the polymerization initiator is not particularly limited, and can be appropriately added according to the type and amount thereof.
- a polymerization initiator may be added to the monomer mixture or the aqueous medium in advance, or the polymerization initiator may be added or dropped all at once into the reaction system during the polymerization.
- the core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) is prepared , for example, by adding an emulsion of the core copolymer (I) to a hydroxyl group-containing polymerizable unsaturated monomer (II 1 ) or a carboxyl group-containing polymerizable unsaturated. It is obtained by adding a monomer mixture composed of the monomer (II 2 ) and other polymerizable unsaturated monomer (II 3 ) and further polymerizing to form a shell copolymer (II).
- the monomer mixture forming the shell part copolymer (II) can appropriately contain components such as the polymerization initiator, chain transfer agent, reducing agent, surfactant and the like as desired. Moreover, although the said monomer mixture can also be dripped as it is, it is desirable to dripping as a monomer emulsion obtained by disperse
- the particle diameter of the monomer emulsion is not particularly limited.
- the monomer mixture for forming the shell copolymer (II) is obtained by, for example, dropping the monomer mixture or the emulsion thereof into the reaction system all at once or gradually, and heating to an appropriate temperature while stirring.
- the shell copolymer (II) is formed around the partial copolymer (I).
- the core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) thus obtained comprises a polymerizable unsaturated monomer (I 1 ) having two or more polymerizable unsaturated groups in one molecule and a polymerizable unsaturated group.
- the core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) is, for example, between the step of obtaining the core portion copolymer (I) and the step of obtaining the shell portion copolymer (II).
- a polymerizable unsaturated monomer single element or a mixture of two or more kinds
- three or more layers can be included.
- shell part of the core-shell type hydroxyl group-containing acrylic resin aqueous dispersion means a polymer layer present in the outermost layer of the resin particles
- core part is a resin excluding the shell part. It means a polymer layer as an inner particle layer
- core / shell structure means a structure having the core part and the shell part.
- the above-mentioned core / shell type structure is generally a layer structure in which the core part is completely covered with the shell part.
- the amount of monomer in the shell part May not be sufficient to form a layered structure.
- the concept of the multilayer structure in the core-shell type structure is similarly applied to the case where a multilayer structure is formed in the core part in the core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ).
- the core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) generally has an average particle size in the range of about 10 to about 1,000 nm, preferably about 30 to about 500 nm, and more preferably about 50 to about 200 nm.
- the average particle size of the core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) is 20 ° C. after diluted with deionized water by a conventional method using a submicron particle size distribution analyzer. It is a measured value.
- the submicron particle size distribution measuring device for example, “COULTER N4 type” (trade name, manufactured by Beckman Coulter, Inc.) can be used.
- the core-shell type hydroxyl group-containing acrylic resin water dispersion in order to improve the mechanical stability of the particles of (A 111), acids such as carboxyl groups of the core-shell type hydroxyl group-containing acrylic resin water dispersion (A 111) is It is desirable to neutralize the group with a neutralizing agent.
- the neutralizing agent is not particularly limited as long as it can neutralize an acid group.
- the neutralizing agent is preferably used in such an amount that the pH of the neutralized core-shell type hydroxyl group-containing acrylic resin aqueous dispersion (A 111 ) is about 6.5 to about 9.0.
- the hydroxyl group-containing polyester resin (A 2 ) can generally be produced by an esterification reaction or an ester exchange reaction between an acid component and an alcohol component.
- the acid component include compounds generally used as an acid component in the production of a polyester resin.
- the acid component include aliphatic polybasic acids, alicyclic polybasic acids, aromatic polybasic acids and the like, and anhydrides and esterified products thereof.
- the aliphatic polybasic acids, and anhydrides and esterified products thereof generally include aliphatic compounds having two or more carboxyl groups in one molecule, acid anhydrides of the aliphatic compounds, and aliphatic compounds.
- An aliphatic polycarboxylic acid such as an acid; an anhydride of the aliphatic polycarboxylic acid; an esterified product of a lower alkyl having about 1 to about 4 carbon atoms of the aliphatic polyvalent carboxylic acid; and any combination thereof Is mentioned.
- the aliphatic polybasic acids, and anhydrides and esterified products thereof are particularly preferably a
- the alicyclic polybasic acids, and anhydrides and esterified products thereof are generally compounds having one or more alicyclic structures and two or more carboxyl groups in one molecule, and acid anhydrides of the above compounds. And esterified products of the above compounds.
- the alicyclic structure is mainly a 4-6 membered ring structure.
- Examples of the alicyclic polybasic acids, and anhydrides and esterified products thereof include 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 4-cyclohexene-1 , 2-dicarboxylic acid, 3-methyl-1,2-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid, 1,2,4-cyclohexanetricarboxylic acid, 1,3,5-cyclohexanetricarboxylic acid, etc.
- Examples of the alicyclic polybasic acids, and anhydrides and esterified products thereof include 1,2-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid anhydride, 1, from the viewpoint of smoothness of the resulting coating film.
- 3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 4-cyclohexene-1,2-dicarboxylic acid, 4-cyclohexene-1,2-dicarboxylic anhydride are preferred, and 1,2-cyclohexanedicarboxylic acid and / or Alternatively, 1,2-cyclohexanedicarboxylic anhydride is more preferable.
- aromatic polybasic acids, and anhydrides and esterified products thereof are generally aromatic compounds having two or more carboxyl groups in one molecule, acid anhydrides of the aromatic compounds, and esters of the aromatic compounds.
- aromatic polyvalent carboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, 4,4′-biphenyldicarboxylic acid, trimellitic acid, pyromellitic acid; Acid anhydrides; esterified products of lower alkyl having about 1 to about 4 carbon atoms of the above aromatic polycarboxylic acids; and any combination thereof.
- aromatic polybasic acids, and anhydrides and esterified products thereof phthalic acid, phthalic anhydride, isophthalic acid, trimellitic acid, and trimellitic anhydride are preferable.
- acid components other than the aliphatic polybasic acid, alicyclic polybasic acid and aromatic polybasic acid for example, coconut oil fatty acid, cottonseed oil fatty acid, hempseed oil fatty acid, rice bran oil fatty acid, fish oil fatty acid , Fatty acids such as tall oil fatty acid, soybean oil fatty acid, linseed oil fatty acid, tung oil fatty acid, rapeseed oil fatty acid, castor oil fatty acid, dehydrated castor oil fatty acid, safflower oil fatty acid; lauric acid, myristic acid, palmitic acid, stearic acid, olein Monocarboxylic acids such as acid, linoleic acid, linolenic acid, benzoic acid, p-tert-butylbenzoic acid, cyclohexane acid, 10-phenyloctadecanoic acid; lactic acid, 3-hydroxybutanoic acid, 3-hydroxy-4-e
- the alcohol component examples include polyhydric alcohols having two or more hydroxyl groups in one molecule, such as ethylene glycol, propylene glycol, diethylene glycol, trimethylene glycol, tetraethylene glycol, triethylene glycol, dipropylene glycol, 1, 4 -Butanediol, 1,3-butanediol, 2,3-butanediol, 1,2-butanediol, 2-methyl-1,3-propanediol, 3-methyl-1,2-butanediol, 2-butyl -2-ethyl-1,3-propanediol, 1,2-pentanediol, 1,5-pentanediol, 1,4-pentanediol, 2,4-pentanediol, 2,3-dimethyltrimethylene glycol, tetra Methylene glycol, 3-methyl-4,3-penta Diol, 3-methyl-1,5-pentanediol
- An alcohol a polylactone diol obtained by adding a lactone compound such as ⁇ -caprolactone to the dihydric alcohol; an ester diol compound such as bis (hydroxyethyl) terephthalate; an alkylene oxide adduct of bisphenol A, polyethylene glycol, polypropyl Polyether diol compounds such as lenglycol and polybutylene glycol; glycerin, trimethylolethane, trimethylolpropane, diglycerin, triglycerin, 1,2,6-hexanetriol, pentaerythritol, dipentaerythritol, tris (2-hydroxy Examples thereof include trivalent or higher alcohols such as ethyl) isocyanuric acid, sorbitol, and mannitol; polylactone polyol compounds obtained by adding a lactone compound such as ⁇ -caprolactone to the above trivalent or higher alcohols; and fatty acid esterified products of glycerin.
- alcohol components other than the polyhydric alcohol for example, monoalcohols such as methanol, ethanol, propyl alcohol, butyl alcohol, stearyl alcohol, 2-phenoxyethanol; propylene oxide, butylene oxide, “Cardura E10” ( Examples thereof include alcohol compounds obtained by reacting monoepoxy compounds such as trade name, HEXION Specialty Chemicals, Inc. (glycidyl esters of synthetic highly branched saturated fatty acids) and acids.
- the hydroxyl group-containing polyester resin (A 2 ) is not particularly limited, and can be produced according to a usual method.
- the acid component and the alcohol component are heated in a nitrogen stream at about 150 to about 250 ° C. for about 5 to about 10 hours to carry out the esterification reaction or transesterification reaction between the acid component and the alcohol component.
- a hydroxyl group-containing polyester resin (A 2 ) can be produced.
- the acid component and the alcohol component When the acid component and the alcohol component are esterified or transesterified, they may be added to the reaction vessel at one time, or one or both may be added in several portions. . Moreover, after synthesizing a hydroxyl group-containing polyester resin, the resulting hydroxyl group-containing polyester resin is reacted with an acid anhydride to be half-esterified to produce a carboxyl group- and hydroxyl group-containing polyester resin. Furthermore, after synthesizing a carboxyl group-containing polyester resin, the above-mentioned alcohol component is added to the carboxyl group-containing polyester resin to produce a hydroxyl group-containing polyester resin (A 2 ).
- catalysts for promoting the reaction include dibutyltin oxide, antimony trioxide, zinc acetate, manganese acetate, cobalt acetate, calcium acetate, lead acetate, tetrabutyl titanate, tetraisopropyl
- a known catalyst such as titanate can be added to the reaction system.
- the hydroxyl group-containing polyester resin (A 2 ) can be modified with a fatty acid, a monoepoxy compound, a polyisocyanate compound or the like during or after preparation of the resin.
- fatty acid 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, linseed oil fatty acid, tung oil fatty acid, rapeseed oil fatty acid, castor oil fatty acid, dehydrated castor Oil fatty acids, safflower oil fatty acids and the like can be mentioned.
- the monoepoxy compound for example, “Cardura E10” (trade name, manufactured by HEXION Specialty Chemicals, a glycidyl ester of a synthetic highly branched saturated fatty acid) is preferable.
- polyisocyanate compound examples include aliphatic diisocyanate compounds such as lysine diisocyanate, hexamethylene diisocyanate, and trimethylhexane diisocyanate; hydrogenated xylylene diisocyanate, isophorone diisocyanate, methylcyclohexane-2,4-diisocyanate, and methylcyclohexane-2.
- 6-diisocyanate 4,4'-methylenebis (cyclohexylisocyanate), 1,3- (isocyanatomethyl) cyclohexane and other alicyclic diisocyanate compounds
- aromatic diisocyanate compounds such as tolylene diisocyanate, xylylene diisocyanate and diphenylmethane diisocyanate
- Organic polyisocyanates such as triisocyanate and higher polyisocyanates such as lysine triisocyanate
- cyclized polymers of the above organic polyisocyanates for example, isocyanurates), biuret type adducts, etc. Any combination is mentioned.
- the content of the alicyclic polybasic acid in the acid component of the raw material is the sum of the acid components. Based on the amount, it is preferably about 20 to about 100 mol%, more preferably about 25 to about 95 mol%, and further preferably about 30 to about 90 mol%.
- the alicyclic polybasic acid is preferably 1,2-cyclohexanedicarboxylic acid and / or 1,2-cyclohexanedicarboxylic anhydride from the viewpoint of improving the smoothness of the resulting coating film.
- the hydroxyl group-containing polyester resin (A 2 ) preferably has a hydroxyl value of about 1 to about 200 mg KOH / g, more preferably about 5 to about 150 mg KOH / g, and even more preferably about 10 to about 100 mg KOH / g.
- the hydroxyl group-containing polyester resin (A 2 ) has a carboxyl group
- the hydroxyl group-containing polyester resin (A 2 ) is preferably about 0.1 to about 55 mgKOH / g, more preferably about 3 to about 50 mgKOH / g. And more preferably has an acid number of from about 7 to about 45 mg KOH / g.
- the hydroxyl group-containing polyester resin (A 2 ) is preferably a number of about 500 to about 50,000, more preferably about 1,000 to about 30,000, and more preferably about 1,200 to about 10,000. Has an average molecular weight.
- the number average molecular weight and the weight average molecular weight are the retention time (retention capacity) measured using a gel permeation chromatograph (GPC) and the retention time of a standard polystyrene with a known molecular weight measured under the same conditions.
- (Retention capacity) is a value obtained by converting to the molecular weight of polystyrene.
- HEC-8120GPC trade name, manufactured by Tosoh Corporation
- TSKgel G4000HXL “TSKgel G3000HXL”, “TSKgel G2500HXL” and “TSKgel” are used as columns.
- G2000HXL (trade name, all manufactured by Tosoh Corporation), using a differential refractometer as the detector, mobile phase: tetrahydrofuran, measurement temperature: 40 ° C, flow rate: 1 mL / min Can be measured below.
- hydroxyl group-containing polyurethane resin (A 3 ) examples include at least one diisocyanate compound selected from the group consisting of aliphatic diisocyanate compounds, alicyclic diisocyanate compounds, and aromatic diisocyanate compounds, polyether polyols, polyester polyols, and the like. Mention may be made of resins produced by reacting at least one polyol compound selected from the group consisting of polycarbonate polyols.
- the hydroxyl group-containing polyurethane resin (A 3 ) can be produced as follows. For example, at least one diisocyanate selected from the group consisting of aliphatic diisocyanates and alicyclic diisocyanates, at least one diol selected from the group consisting of polyether diols, polyester diols and polycarbonate diols, low molecular weight polyhydroxy compounds. In addition, a dimethylolalkanoic acid is reacted to produce a urethane prepolymer.
- the block polyisocyanate compound (B) has the following general formula (I): (Wherein R 1 , R 2 , R 4 and R 5 independently represent a hydrocarbon group having from about 1 to about 12 carbon atoms, and R 3 is a straight chain having from about 1 to about 12 carbon atoms) Represents a branched or branched alkylene group)
- the block polyisocyanate compound (B) is prepared by, for example, reacting an active methylene compound (b 2 ) with an isocyanate group in a polyisocyanate compound (b 1 ) having two or more isocyanate groups in one molecule, after obtaining isocyanate compound precursor (b 3), blocked polyisocyanate compound precursor (b 3) a secondary alcohol (b 4) means for reacting the active methylene compound (b 2) and secondary alcohol (b
- the former can be obtained by means of reacting the reaction product 4 ) with the isocyanate group in the polyisocyanate compound (b 1 ).
- the polyisocyanate compound (b 1 ) is a compound having at least two isocyanate groups in one molecule, and examples thereof include aliphatic polyisocyanates, alicyclic polyisocyanates, araliphatic polyisocyanates, aromatic polyisocyanates, And their derivatives, and any combination thereof.
- aliphatic polyisocyanate examples include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3.
- Aliphatic diisocyanates such as butylene diisocyanate, 2,4,4- or 2,2,4-trimethylhexamethylene diisocyanate, dimer diisocyanate, methyl 2,6-diisocyanatohexanoate (common name: lysine diisocyanate); 2 , 6-Diisocyanatohexanoic acid 2-isocyanatoethyl, 1,6-diisocyanato-3-isocyanatomethylhexane, 1,4,8-triisocyanatooctane, 1,6 11-triisocyanatoundecane, 1,8-diisocyanato-4-isocyanatomethyloctane, 1,3,6-triisocyanatohexane, 2,5,7-trimethyl-1,8-diisocyanato-5-isocyanatomethyl Examples thereof include aliphatic triisocyanates such as octane.
- Examples of the alicyclic polyisocyanate include 1,3-cyclopentene diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (common name) : Isophorone diisocyanate), 4-methyl-1,3-cyclohexylene diisocyanate (common name: hydrogenated TDI), 2-methyl-1,3-cyclohexylene diisocyanate, 1,3- or 1,4-bis (isocyanato) Methyl) cyclohexane (common name: hydrogenated xylylene diisocyanate) or a mixture thereof, methylenebis (4,1-cyclohexanediyl) diisocyanate (common name: hydrogenated MDI), norbornane diisocyanate such as norbornane diisocyanate 1,3,5-tri
- araliphatic polyisocyanate examples include methylene bis (4,1-phenylene) diisocyanate (common name: MDI), 1,3- or 1,4-xylylene diisocyanate or a mixture thereof, ⁇ , ⁇ ′-diisocyanato- Aromatic aliphatic diisocyanates such as 1,4-diethylbenzene, 1,3- or 1,4-bis (1-isocyanato-1-methylethyl) benzene (common name: tetramethylxylylene diisocyanate) or mixtures thereof; 1,3 And araliphatic triisocyanates such as 5-triisocyanatomethylbenzene.
- MDI methylene bis (4,1-phenylene) diisocyanate
- 1,3- or 1,4-xylylene diisocyanate or a mixture thereof ⁇ , ⁇ ′-diisocyanato- Aromatic aliphatic diisocyanates
- aromatic polyisocyanate examples include m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4′-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, 2,4-tolylene diisocyanate (common name: 2,4- TDI) or 2,6-tolylene diisocyanate (common name: 2,6-TDI) or mixtures thereof, aromatic diisocyanates such as 4,4′-toluidine diisocyanate, 4,4′-diphenyl ether diisocyanate; , 4 ′, 4 ′′ -triisocyanate, 1,3,5-triisocyanatobenzene, 2,4,6-triisocyanatotoluene and the like; 4,4′-diphenylmethane-2,2 ′ , 5,5'-tetraisocyanate Mention may be made of the La isocyanate.
- Examples of the derivatives include dimers, trimers, biurets, allophanates, uretdiones, uretoimines, isocyanurates, oxadiazine triones, and the like of the above polyisocyanates, and polymethylene polyphenyl polyisocyanates (crude MDI, polymeric MDI), Examples include Crude TDI.
- polyisocyanate compound (b 1 ) aliphatic diisocyanate, alicyclic diisocyanate and derivatives thereof are preferable because the obtained block polyisocyanate compound (B) is hardly yellowed when heated.
- polyisocyanate compound (b 1 ) aliphatic diisocyanates and derivatives thereof are more preferable from the viewpoint of improving the flexibility of the formed coating film.
- the polyisocyanate compound (b 1 ) includes an aliphatic polyisocyanate, an alicyclic polyisocyanate, an araliphatic polyisocyanate, an aromatic polyisocyanate, and derivatives thereof, and any combination thereof.
- the compound which can react with isocyanate and the prepolymer manufactured by making an isocyanate group react on excess conditions are contained.
- Examples of the compound capable of reacting with the polyisocyanate include compounds having an active hydrogen group such as a hydroxyl group and an amino group. Specifically, for example, a polyhydric alcohol, a low molecular weight polyester resin, an amine, water, etc. Can be mentioned.
- the polyisocyanate compound (b 1 ) includes a polymer of an isocyanate group-containing polymerizable unsaturated monomer, or a polymerizable unsaturated group other than the isocyanate group-containing polymerizable unsaturated monomer and the isocyanate group-containing polymerizable unsaturated monomer. Copolymers with monomers are included.
- the polyisocyanate compound (b 1 ) is preferably about 300 to about 20, from the viewpoint of the reactivity of the resulting block polyisocyanate compound (B) and the compatibility between the block polyisocyanate compound (B) and other coating components. 000, more preferably from about 400 to about 8,000, and even more preferably from about 500 to about 2,000.
- the polyisocyanate compound (b 1 ) is an average isocyanate in one molecule from the viewpoint of the reactivity of the resulting block polyisocyanate compound (B) and the compatibility between the block polyisocyanate compound (B) and other coating components.
- the number of functional groups is preferably in the range of about 2 to about 100.
- the average isocyanate functional group is more preferably about 3 or more from the viewpoint of increasing the reactivity of the resulting block polyisocyanate compound (B).
- the average isocyanate functional group is more preferably about 20 or less from the viewpoint of preventing gelation during the production of the block polyisocyanate compound (B).
- active methylene compound (b 2 ) examples include dimethyl malonate, diethyl malonate, di-n-propyl malonate, diisopropyl malonate, and di-n malonate.
- the active methylene compound (b 2 ) is composed of dimethyl malonate, diethyl malonate, diisopropyl malonate, methyl acetoacetate, ethyl acetoacetate, methyl isobutyrylacetate from the viewpoint of smoothness and sharpness of the formed multilayer coating film. And at least one compound selected from the group consisting of ethyl isobutyryl acetate, and at least one compound selected from the group consisting of diisopropyl malonate, methyl isobutyryl acetate and ethyl isobutyryl acetate. More preferred.
- the active methylene compound (b 2 ) is used in view of the smoothness and sharpness of the multilayer coating film to be formed, the reactivity of the resulting block polyisocyanate compound (B), and the storage stability of the aqueous colored paint (Y 1 ). Therefore, diisopropyl malonate is more preferable.
- the blocking reaction of the isocyanate group with the active methylene compound (b 2 ) can optionally include a reaction catalyst.
- the reaction catalyst include metal hydroxide, metal alkoxide, metal carboxylate, metal acetyl acetylate, hydroxide of onium salt, onium carboxylate, metal salt of active methylene compound, onium salt of active methylene compound, aminosilane , Basic compounds such as amines and phosphines.
- an ammonium salt, a phosphonium salt, and a sulfonium salt are preferable.
- the amount of the reaction catalyst is generally in the range of about 10 to about 10,000 ppm, based on the total solid mass of the polyisocyanate compound (b 1 ) and the active methylene compound (b 2 ). Preferably, and more preferably in the range of about 20 to about 5,000 ppm.
- the blocking reaction of the isocyanate group with the active methylene compound (b 2 ) can be performed at about 0 to about 150 ° C. and can include a solvent.
- a solvent aprotic solvents are preferable, and solvents such as esters, ethers, N-alkylamides, and ketones are particularly preferable.
- the blocking reaction may be stopped by adding an acid component to the reaction system and neutralizing the basic compound as a catalyst.
- Active methylene compounds (b 2) in blocking reaction of the isocyanate groups by the amount of the active methylene compound (b 2) is not particularly limited.
- the isocyanate groups to 1 mole of the polyisocyanate compound (b 1) Preferably about 0.1 to about 3 moles, and more preferably about 0.2 to about 2 moles.
- the active methylene compound that has not reacted with the isocyanate group in the polyisocyanate compound (b 1 ) can be removed after completion of the blocking reaction.
- the active methylene compound (b 2) in blocking reaction of the isocyanate groups by, in addition to the active methylene compound (b 2), for example, alcohol, phenol, oxime, amine, acid amide, imidazole, A blocking agent such as pyridine or mercaptan can be added.
- the blocked polyisocyanate compound (B) includes those in which a part of the isocyanate group is blocked by a blocking agent other than the active methylene compound (b 2 ).
- the polyisocyanate compound (b 1) a portion of the isocyanate groups in, may be reacted with an active hydrogen-containing compound.
- an active hydrogen-containing compound By reacting some of the isocyanate groups in the polyisocyanate compound (b 1 ) with the active hydrogen-containing compound, for example, improvement in storage stability of the resulting block polyisocyanate compound (B), block polyisocyanate compound (B ) And other paint components can be adjusted, and the flexibility of the formed coating film can be improved.
- the polyisocyanate compound (b 1 ) When some of the isocyanate groups in the polyisocyanate compound (b 1 ) are reacted with the active hydrogen-containing compound, the polyisocyanate compound (b 1 ), the active methylene compound (b 2 ), and the active hydrogen-containing compound are reacted.
- the order of making them is not particularly limited.
- Examples of the active hydrogen-containing compound include a hydroxyl group-containing compound and an amino group-containing compound.
- the hydroxyl group-containing compound include propanol, butanol, pentanol, hexanol, heptanol, 2-ethyl-1-hexanol, octanol, nonanol, decanol, tridecanol, stearyl alcohol, ethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol Polyethylene glycol (propylene glycol), polyethylene glycol monoalkyl ether, polypropylene glycol monoalkyl ether, polyethylene glycol (propylene glycol) monoalkyl ether, trimethylolpropane and the like, and any combination thereof.
- polyethylene glycol (propylene glycol) means a copolymer of ethylene glycol and propylene glycol, and includes block copolymers and random copolymers thereof.
- the hydroxyl group-containing compound is preferably a monohydric alcohol from the viewpoint of suppressing the increase in viscosity of the resulting block polyisocyanate compound (B).
- the monohydric alcohol include propanol, butanol, pentanol, hexanol, heptanol, 2-ethyl-1-hexanol, octanol, nonanol, decanol, tridecanol, stearyl alcohol, polyethylene glycol monoalkyl ether, polypropylene glycol monoalkyl. Examples include ether, polyethylene glycol (propylene glycol) monoalkyl ether, and the like, and any combination thereof.
- amino group-containing compound examples include butylamine, octylamine, stearylamine, dibutylamine, dioctylamine, dicyclohexylamine, dilaurylamine, ⁇ - (aminoalkyl) - ⁇ -alkoxypolyoxyethylene (oxypropylene).
- Hexamethylenediamine, diethylenetriamine, polyoxypropylene- ⁇ , ⁇ -diamine commercially available products include, for example, “Jeffamine D-400” manufactured by Huntsman), and any combination thereof. It is done.
- the amino group-containing compound is preferably a monovalent amine from the viewpoint of suppressing the increase in viscosity of the resulting block polyisocyanate compound (B).
- the monovalent amine include butylamine, octylamine, stearylamine, dibutylamine, dioctylamine, dicyclohexylamine, dilaurylamine, ⁇ - (aminoalkyl) - ⁇ -alkoxypolyoxyethylene (oxypropylene), and the like. As well as any combination thereof.
- the ratio of the polyisocyanate compound (b 1 ) to the active hydrogen-containing compound is based on 1 mole of isocyanate groups in the polyisocyanate compound (b 1 ).
- the number of moles of active hydrogen in the containing compound is preferably in the range of about 0.03 to about 0.6 moles.
- the ratio is more preferably about 0.4 or less, and preferably about 0.3, from the viewpoints of curability of the water-based colored paint (Y 1 ) and water resistance of the formed multilayer coating film. Further preferred.
- the ratio is more preferably about 0.04 or more from the viewpoint of the storage stability of the water-based colored paint (Y 1 ) and the smoothness and sharpness of the formed multilayer coating film, and is preferably about 0.04. More preferably, it is 05 or more.
- the block polyisocyanate compound (B) is a block polyisocyanate compound having a hydrophilic group from the viewpoint of the storage stability and curability of the water-based colored paint (Y 1 ) and the smoothness and sharpness of the formed multilayer coating film. It is preferably an isocyanate compound (B ′).
- the block polyisocyanate compound (B ′) having a hydrophilic group can be obtained, for example, by using an active hydrogen-containing compound having a hydrophilic group as the active hydrogen-containing compound.
- the active hydrogen-containing compound having a hydrophilic group examples include an active hydrogen-containing compound having a nonionic hydrophilic group, an active hydrogen-containing compound having an anionic hydrophilic group, an active hydrogen-containing compound having a cationic hydrophilic group, and the like. Any combination thereof may be mentioned.
- Active hydrogen-containing compound having a nonionic hydrophilic group since the reaction of blocking the isocyanate group in the polyisocyanate compound (b 1 ) with the active methylene compound (b 2 ) is less likely to be inhibited. A compound is preferred.
- Examples of the active hydrogen-containing compound having a nonionic hydrophilic group include active hydrogen-containing compounds having a polyoxyalkylene group.
- Examples of the polyoxyalkylene group include a polyoxyethylene group, a polyoxypropylene group, a polyoxyethyleneoxypropylene group, and any combination thereof.
- the active hydrogen-containing compound having a nonionic hydrophilic group preferably has a polyoxyethylene group from the viewpoint of the storage stability of the aqueous colored paint (Y 1 ).
- the active hydrogen-containing compound having a polyoxyethylene group is about 3 or more, preferably about 5 to about 5 from the viewpoint of storage stability of the water-based colored paint (Y 1 ) and water resistance of the formed multilayer coating film. It is preferred to have about 100, more preferably about 8 to about 45 consecutive oxyethylene groups, ie polyoxyethylene blocks.
- the active hydrogen-containing compound having a polyoxyethylene group may contain an oxyalkylene group other than the oxyethylene group in addition to the polyoxyethylene block.
- the oxyalkylene group other than the oxyethylene group include an oxypropylene group, an oxybutylene group, and an oxystyrene group.
- the molar ratio of the oxyethylene group in the oxyalkylene group is in the range of about 20 to about 100 mol% from the viewpoint of the storage stability of the aqueous colored paint (Y 1 ). And more preferably in the range of about 50 to about 100 mole percent.
- the molar ratio of the oxyethylene group in the oxyalkylene group is less than about 20 mol%, the hydrophilicity of the water-based colored paint (Y 1 ) is not sufficient, and its storage stability may be lowered.
- the active hydrogen-containing compound having a nonionic hydrophilic group has a number average molecular weight of about 200 to about 200 from the viewpoint of the storage stability of the water-based colored paint (Y 1 ) and the water resistance of the formed multilayer coating film. It is preferably within the range of 2,000.
- the number average molecular weight is more preferably about 300 or more, and further preferably about 400 or more, from the viewpoint of the storage stability of the water-based colored paint (Y 1 ).
- the number average molecular weight is more preferably about 1,500 or less, and further preferably about 1,200 or less, from the viewpoint of water resistance of the formed multilayer coating film.
- Examples of the active hydrogen-containing compound having a nonionic hydrophilic group include polyethylene glycol monoalkyl ethers (also known as ⁇ -alkoxypolyoxyethylene) such as polyethylene glycol monomethyl ether and polyethylene glycol monoethyl ether, polypropylene glycol monomethyl ether, and Polypropylene glycol monoalkyl ethers such as polypropylene glycol monoethyl ether (also known as ⁇ -alkoxypolyoxypropylene), ⁇ -alkoxypolyoxyethylene (oxypropylene), ⁇ -alkoxypolyoxyethylene (oxypropylene), etc.
- polyethylene glycol monoalkyl ethers also known as ⁇ -alkoxypolyoxyethylene
- polypropylene glycol monoethyl ether also known as ⁇ -alkoxypolyoxypropylene
- ⁇ -alkoxypolyoxyethylene ⁇ -alkoxypropylene
- ⁇ -alkoxypolyoxyethylene oxypropylene
- the active hydrogen-containing compound having a nonionic hydrophilic group is preferably polyethylene glycol monomethyl ether, polyethylene glycol monoethyl ether, or polyethylene glycol, and more preferably polyethylene glycol monomethyl ether.
- Examples of the commercially available polyethylene glycol monomethyl ether include “Uniox M-400”, “Uniox M-550”, “Uniox M-1000”, “Uniox M-” manufactured by NOF Corporation. 2000 "and the like.
- Examples of commercially available polyethylene glycol include “PEG # 200”, “PEG # 300”, “PEG # 400”, “PEG # 600”, “PEG # 1000”, “ PEG # 1500 “,” PEG # 1540 ",” PEG # 2000 "and the like.
- the active hydrogen-containing compound having an anionic hydrophilic group examples include an active hydrogen-containing compound having an acid group, such as an active hydrogen-containing compound having a carboxyl group, an active hydrogen-containing compound having a sulfonic acid group, and a phosphate group. Active hydrogen-containing compounds having the formula: and neutralized salts thereof, and any combinations thereof.
- the active hydrogen-containing compound having an anionic hydrophilic group is preferably an active hydrogen-containing compound having a carboxyl group from the viewpoint of compatibility between the obtained block polyisocyanate compound (B) and other coating components.
- Part or all of the acid groups in the active hydrogen-containing compound having an anionic hydrophilic group are inhibited by the reaction that blocks the isocyanate group in the polyisocyanate compound (b 1 ) with the active methylene compound (b 2 ). Since it becomes difficult to be carried out, it is preferably neutralized with a basic compound.
- the acid group in the active hydrogen-containing compound having an anionic hydrophilic group may be neutralized before the reaction between the active hydrogen-containing compound having an anionic hydrophilic group and the polyisocyanate compound (b 1 ), Or you may neutralize after those reaction.
- Examples of the basic compound include alkali metal or alkaline earth metal hydroxides such as sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, and barium hydroxide; metal alkoxides; ammonia; ethylamine, propyl 1st amine, butylamine, benzylamine, monoethanolamine, 2,2-dimethyl-3-amino-1-propanol, 2-aminopropanol, 2-amino-2-methyl-1-propanol, 3-aminopropanol, etc.
- alkali metal or alkaline earth metal hydroxides such as sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, and barium hydroxide
- metal alkoxides such as sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, and barium hydroxide
- metal alkoxides such as sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, and barium hydro
- Secondary monoamines such as diethylamine, diethanolamine, di-n-propanolamine, di-isopropanolamine, N-methylethanolamine, N-ethylethanolamine; dimethylethanolamine, trimethylamine, triethylamine, Tertiary monoamines such as triisopropylamine, methyldiethanolamine, 2- (dimethylamino) ethanol; polyamines such as diethylenetriamine, hydroxyethylaminoethylamine, ethylaminoethylamine, methylaminopropylamine, etc., and any combination thereof .
- the amount of the basic compound is generally about 0.1 to about 1.5 equivalents, and preferably about 0.2 to about 1.5 anionic groups in the active hydrogen-containing compound having an anionic hydrophilic group. Within the range of about 1.2 equivalents.
- Examples of the active hydrogen-containing compound having a carboxyl group include monohydroxycarboxylic acids such as glycolic acid, lactic acid, hydroxypivalic acid, malic acid and citric acid, 2,2-dimethylolacetic acid, 2,2-dimethylollactic acid, , 2-dimethylolpropionic acid, 2,2-dimethylolbutanoic acid, dimethylolheptanoic acid, dimethylolnonanoic acid, 2,2-dimethylolbutyric acid and 2,2-dimethylolvaleric acid, etc., and their dihydroxycarboxylic acids Examples include acid lactone ring-opening adducts, glycine, 1-carboxy-1,5-pentylenediamine, dihydroxybenzoic acid, 3,5-diaminobenzoic acid, lysine, and arginine.
- monohydroxycarboxylic acids such as glycolic acid, lactic acid, hydroxypivalic acid, malic acid and citric acid, 2,
- Examples of the active hydrogen-containing compound having a sulfonic acid group include 2-amino-1-ethanesulfonic acid, N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, and 1,3-phenylenediamine. -4,6-disulfonic acid, diaminobutanesulfonic acid, 3,6-diamino-2-toluenesulfonic acid, 2,4-diamino-5-toluenesulfonic acid, 2- (cyclohexylamino) -ethanesulfonic acid, 3- (Cyclohexylamino) -propanesulfonic acid and the like.
- Examples of the active hydrogen-containing compound having a phosphoric acid group include 2,3-dihydroxypropylphenyl phosphate, hydroxyalkylphosphonic acid, aminoalkylphosphonic acid and the like.
- the ratio of the active hydrogen-containing compound having a polyisocyanate compound (b 1) and hydrophilic groups, isocyanate groups of the polyisocyanate compound (b 1) of 1 Preferably, based on moles, the number of moles of active hydrogen in the active hydrogen-containing compound is in the range of about 0.03 to about 0.6 mole.
- the ratio is more preferably about 0.4 or less, and about 0.3 or less, from the viewpoint of the curability of the water-based colored paint (Y 1 ) and the water resistance of the formed multilayer coating film. Is more preferable.
- the ratio is more preferably about 0.04 or more from the viewpoint of the storage stability of the water-based colored paint (Y 1 ) and the smoothness and sharpness of the formed multilayer coating film, and is preferably about 0.04. More preferably, it is 05 or more.
- the block polyisocyanate compound (B) can be added as a mixture with a surfactant in order to produce the water-based colored paint (Y 1 ).
- the surfactant is preferably a nonionic surfactant and / or an anionic surfactant from the viewpoint of the stability of the aqueous colored paint (Y 1 ).
- the block polyisocyanate compound precursor (b 3 ) can be formed by reacting a polyisocyanate compound (b 1 ) having two or more isocyanate groups in one molecule and an active methylene compound (b 2 ). A part or all of the isocyanate groups in the compound (b 1 ) is a compound blocked with an active methylene compound (b 2 ).
- the block polyisocyanate compound precursor (b 3 ) is represented by the following general formula (IV): Wherein R 1 independently represents a hydrocarbon group having about 1 to about 12 carbon atoms, and each R 1 is the same or different from each other.
- Block Polyisocyanate Compound Precursor (b 31 ) an active methylene compound that can be produced or obtained relatively easily can be used as the active methylene compound (b 2 ), which is one of the raw materials of the block polyisocyanate compound (B).
- R 1 is preferably an alkyl group having about 1 to about 3 carbon atoms.
- R 1 is more preferably an alkyl group having about 2 or about 3 carbon atoms from the viewpoint of improving the compatibility between the resulting blocked polyisocyanate compound (B) and other paint components, and is an aqueous colored paint (Y From the viewpoints of the storage stability of 1 ), the smoothness of the formed multilayer coating film and the sharpness, R 1 is more preferably an isopropyl group.
- the block polyisocyanate compound precursor (b 31 ) can be obtained, for example, by reacting the polyisocyanate compound (b 1 ) with a dialkyl malonate having a hydrocarbon group having about 1 to about 12 carbon atoms.
- dialkyl malonate examples include dimethyl malonate, diethyl malonate, di-n-propyl malonate, diisopropyl malonate, di-n-butyl malonate, diisobutyl malonate, disec-butyl malonate, di-tert malonate.
- the dialkyl malonate is dimethyl malonate, diethyl malonate, di-n-propyl malonate, diisopropyl malonate, di-n-butyl malonate, diisobutyl malonate, di-sec-butyl malonate, and di-tert-butyl malonate. And is more preferably diethyl malonate, di-n-propyl malonate, and diisopropyl malonate, and even more preferably diisopropyl malonate.
- the block polyisocyanate compound precursor (b 32 ) has a viewpoint that an active methylene compound that can be produced or obtained relatively easily can be used as the active methylene compound (b 2 ) that is one of the raw materials of the block polyisocyanate compound (B). Therefore, it is preferable that R 6 and R 7 are alkyl groups having about 1 to about 3 carbon atoms.
- R 6 and R 7 are more preferably an alkyl group having about 2 or about 3 carbon atoms from the viewpoint of improving the compatibility between the resulting blocked polyisocyanate compound (B) and other coating components, and aqueous coloring From the viewpoint of the storage stability of the paint (Y 1 ), the smoothness of the multilayer coating film and the sharpness, it is more preferable that R 6 and R 7 are isopropyl groups.
- the block polyisocyanate compound precursor (b 32 ) is obtained, for example, by reacting (i) the polyisocyanate compound (b 1 ) with an acetoacetate ester having a hydrocarbon group having about 1 to about 12 carbon atoms, (ii) It can be obtained by reacting the polyisocyanate compound (b 1 ) with an isobutyryl acetate having a hydrocarbon group having about 1 to about 12 carbon atoms.
- the block polyisocyanate compound precursor (b 32 ) is preferably obtained by reacting the polyisocyanate compound (b 1 ) with an isobutyryl acetate having a hydrocarbon group having about 1 to about 12 carbon atoms.
- isobutyryl acetate having a hydrocarbon group having about 1 to about 12 carbon atoms examples include, for example, alkyl esters of about 1 to about 12 carbon atoms of isobutyryl acetate, such as methyl isobutyryl acetate, ethyl isobutyryl acetate, isobutyryl acetate n- Propyl, isobutyryl acetate, isobutyryl acetate n-butyl, isobutyryl acetate isobutyl, isobutyryl acetate sec-butyl, isobutyryl acetate tert-butyl, isobutyryl acetate n-pentyl, isobutyryl acetate n-hexyl, isobutyryl acetate 2-ethylhexyl, phenyl isobutyryl acetate, Benzyl isobutyryl acetate and the like, and any combination thereof, and methyl iso
- Examples of the acetoacetate having a hydrocarbon group having about 1 to about 12 carbon atoms include alkyl esters of about 1 to about 12 carbon atoms of acetoacetate such as methyl acetoacetate, ethyl acetoacetate, acetoacetate.
- n-propyl isopropyl acetoacetate, n-butyl acetoacetate, isobutyl acetoacetate, sec-butyl acetoacetate, tert-butyl acetoacetate, n-pentyl acetoacetate, n-hexyl acetoacetate, 2-ethylhexyl acetoacetate, acetoacetate
- Examples include phenyl, benzyl acetoacetate, and the like, and any combination thereof, and methyl acetoacetate, ethyl acetoacetate, and isopropyl acetoacetate are preferred.
- the block polyisocyanate compound precursor (b 3 ) reacts a polyisocyanate compound (b 1 ) having two or more isocyanate groups in one molecule, an active methylene compound (b 2 ), and the active hydrogen-containing compound.
- the compound obtained by this may be sufficient.
- a part of the isocyanate group in the polyisocyanate compound (b 1 ) is an active methylene compound ( A blocked polyisocyanate compound blocked by b 2 ) and reacted with an active hydrogen-containing compound in which some or all of the other isocyanate groups have a polyoxyalkylene group can be produced.
- the block polyisocyanate compound (B) can be produced, for example, by reacting the block polyisocyanate compound precursor (b 3 ) with a secondary alcohol.
- a secondary alcohol Although it does not restrict
- R 2 is preferably a methyl group from the viewpoint of increasing the reactivity with the block polyisocyanate compound precursor (b 3 ).
- R 3 , R 4 and R 5 each have a large number of carbons, the polarity of the resulting block polyisocyanate compound (B) may decrease, and the compatibility with other paint components may decrease.
- R 3 is preferably an alkylene group having about 1 to about 3 carbon atoms, and R 4 and R 5 are preferably methyl groups.
- Examples of the secondary alcohol (b 4 ) include 4-methyl-2-pentanol, 5-methyl-2-hexanol, 6-methyl-2-heptanol, 7-methyl-2-octanol, and any of them. The combination of is mentioned. Secondary alcohol (b 4), after the reaction of the blocked polyisocyanate compound precursor (b 3) and secondary alcohol (b 4), a part or all of the secondary alcohol of unreacted (b 4) is distilled off In this case, 4-methyl-2-pentanol having a relatively low boiling point is preferable because the removal thereof is relatively simple.
- the block polyisocyanate compound (B) is, for example, the following general formula (IV): Wherein R 1 independently represents a hydrocarbon group having about 1 to about 12 carbon atoms, and each R 1 is the same or different from each other.
- blocked polyisocyanate compound precursor (b 31) it can be prepared by reacting a secondary alcohol (b 4).
- R 1 in the blocked isocyanate group in the blocked polyisocyanate compound precursor (b 31 ) is represented by the following general formula (VII): Wherein R 2 , R 4 and R 5 independently represent a hydrocarbon group having from about 1 to about 12 carbon atoms, and R 3 is a linear or branched group having from about 1 to about 12 carbon atoms Represents an alkylene group) It is substituted with a group represented by
- the resulting blocked polyisocyanate compound (B) is represented by the following general formula (I): (Wherein R 1 , R 2 , R 4 and R 5 independently represent a hydrocarbon group having from about 1 to about 12 carbon atoms, and R 3 is a straight chain having from about 1 to about 12 carbon atoms) Represents a branched or branched alkylene group) Or a blocked isocyanate group represented by the following general formula (II): (Wherein R 2 , R 3 , R 4 and R 5 are as described above). It has the block isocyanate group shown by these.
- R 1 is more preferably a hydrocarbon group having about 1 to about 8 carbon atoms, more preferably a hydrocarbon group having about 1 to about 4 carbon atoms, and about 1 to about carbon atoms. Even more preferred are 2 to about 3 hydrocarbon groups.
- the reaction of the blocked polyisocyanate compound precursor (b 31 ) and the secondary alcohol (b 4 ) may be carried out by converting at least one of R 1 in the blocked isocyanate group in the block polyisocyanate compound precursor (b 31 ) to the general formula ( If it is a manufacturing method which can be substituted by the group shown by VII), it will not specifically limit.
- part or all of the alcohol derived from at least one of R 1 in the block polyisocyanate compound precursor (b 31 ) is distilled out of the system by heating, decompression, etc., and the reaction is promoted.
- Those which obtain a blocked polyisocyanate compound (B) having a blocked isocyanate group represented by formula (I) or (II) are preferred.
- the above process is preferably at a temperature of about 20 to about 150 ° C., and more preferably at a temperature of about 75 to about 95 ° C., optionally with reduced pressure, preferably about 5 minutes to about 20 hours, and more Preferably, part or all of the alcohol is removed over a period of about 10 minutes to about 10 hours.
- the temperature is too low, blocked polyisocyanate compound precursor (b 31) in exchange reactions of alkoxy groups is too slow reduced the production efficiency of, whereas, if the temperature is too high, the resulting blocked polyisocyanate compound ( The decomposition and degradation of B) become severe and the curability may be lowered.
- the block polyisocyanate compound (B) has the following general formula (V): (Wherein R 6 and R 7 independently represent a hydrocarbon group having from about 1 to about 12 carbon atoms) In having a blocked isocyanate group represented, blocked polyisocyanate compound precursor (b 32), it can be prepared by reacting a secondary alcohol (b 4).
- R 7 in the blocked isocyanate group in the blocked polyisocyanate compound precursor (b 32 ) is represented by the following general formula (VII): Wherein R 2 , R 4 and R 5 independently represent a hydrocarbon group having from about 1 to about 12 carbon atoms, and R 3 is a linear or branched group having from about 1 to about 12 carbon atoms Represents an alkylene group) It is substituted with a group represented by
- the resulting block polyisocyanate compound (B) is represented by the following general formula (III): (Wherein R 2 , R 3 , R 4 and R 5 are as described above, and R 6 represents a hydrocarbon group having from about 1 to about 12 carbon atoms) It has the block isocyanate group shown by these.
- the reaction of the blocked polyisocyanate compound precursor (b 32 ) and the secondary alcohol (b 4 ) can be carried out, for example, by replacing R 7 in the blocked isocyanate group in the blocked polyisocyanate compound precursor (b 32 ) with the general formula (VII)
- R 7 in the blocked isocyanate group in the blocked polyisocyanate compound precursor (b 32 ) with the general formula (VII)
- a part or all of the alcohol derived from R 7 in the block polyisocyanate compound precursor (b 32 ) is distilled out of the system by heating, depressurizing, etc., and the reaction is promoted. What obtains the block polyisocyanate compound (B) which has the block isocyanate group shown by (III) is preferable.
- the above production method is specifically preferably at a temperature of about 20 to about 150 ° C., and more preferably about 75 to about 95 ° C., optionally with reduced pressure, preferably about 5 minutes to about 20 hours, and more Preferably, part or all of the alcohol is removed over a period of about 10 minutes to about 10 hours.
- a temperature of about 20 to about 150 ° C., and more preferably about 75 to about 95 ° C., optionally with reduced pressure, preferably about 5 minutes to about 20 hours, and more Preferably, part or all of the alcohol is removed over a period of about 10 minutes to about 10 hours.
- the temperature is too low, blocked polyisocyanate compound precursor (b 32) exchange reaction of alkoxy groups is too slow reduced the production efficiency in.
- the temperature is too high, the resulting blocked polyisocyanate compound ( In some cases, the degradation and deterioration of B) become severe and the curability is lowered.
- the amount of the block polyisocyanate compound precursor (b 3 ) and the secondary alcohol (b 4 ) in the production of the block polyisocyanate compound (B) depends on the reactivity and production efficiency of the resulting block polyisocyanate compound (B).
- the secondary alcohol (b 4 ) is preferably in the range of about 5 to about 500 parts by weight based on 100 parts by weight of the solid content of the blocked polyisocyanate compound precursor (b 3 ), and about More preferably, it is in the range of 10 to about 200 parts by weight.
- the amount of the secondary alcohol (b 4 ) is less than about 5 parts by mass, the reaction rate of the blocked polyisocyanate compound precursor (b 3 ) and the secondary alcohol (b 4 ) may be too slow.
- the amount of the secondary alcohol (b 4 ) exceeds about 500 parts by mass, the concentration of the block polyisocyanate compound (B) to be produced becomes too low, and the production efficiency may be lowered.
- the block polyisocyanate compound precursor (b 3 ) and the secondary alcohol (b 4 ) may be adjusted after the polyfunctional hydroxyl group-containing compound is added to the secondary alcohol (b 4 ).
- the number average molecular weight of the block polyisocyanate compound (B) is about 600 from the viewpoints of compatibility with other paint components, smoothness of the formed multilayer coating film, sharpness, water resistance and chipping resistance. Preferably in the range of about 30,000.
- the number average molecular weight is more preferably about 10,000 or less from the viewpoint of compatibility with other paint components and the smoothness and sharpness of the formed multilayer coating film, and about 5,000. More preferably, it is as follows.
- the number average molecular weight is more preferably about 900 or more, and further preferably about 1,000 or more, from the viewpoint of water resistance and chipping resistance of the multilayer coating film to be formed.
- aqueous colored paint (Y 1 ) for base coat is an aqueous paint composition containing a hydroxyl group-containing resin (A) and a blocked polyisocyanate compound (B). It is a thing.
- the water-based colored paint (Y 1 ) is a hydroxyl group-containing resin (A) and a block polyisocyanate compound (B), based on 100 parts by mass of a solid content meter of the hydroxyl group-containing resin (A) and the block polyisocyanate compound (B).
- the aqueous coloring paint (Y 1 ) contains a hydroxyl group-containing acrylic resin (A 1 ) and a hydroxyl group-containing polyester resin (A 2 ) as the hydroxyl group-containing resin (A), the hydroxyl group-containing acrylic resin (A 1 ) and the hydroxyl group
- the ratio of the containing polyester resin (A 2 ) is a solid content mass ratio based on the solid content mass of the hydroxyl group-containing resin (A), and the hydroxyl group-containing acrylic resin (A 1 ) and the hydroxyl group-containing polyester resin (A 2 ) (hydroxyl group).
- Containing acrylic resin (A 1 ) / hydroxyl group-containing polyester resin (A 2 )) is preferably about 95/5 to about 5/95, more preferably about 80/20 to about 20/80, and more preferably about 60. / 40 to about 40/60. This is from the viewpoint of smoothness, sharpness, water resistance, and the like of the formed multilayer coating film.
- the water-based colored paint (Y 1 ) can further contain a curing agent other than the block polyisocyanate compound (B).
- a curing agent other than the block polyisocyanate compound (B).
- the curing agent include known curing agents, particularly amino resins.
- Examples of the amino resin include a partially methylolated amino resin or a completely methylolated amino resin obtained by a reaction between an amino component and an aldehyde component.
- Examples of the amino component include melamine, urea, benzoguanamine, acetoguanamine, steroguanamine, spiroguanamine, and dicyandiamide.
- Examples of the aldehyde component include formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde, and the like.
- examples of the amino resin include those obtained by partially or completely etherifying the methylol group of the methylolated amino resin with alcohol.
- examples of the alcohol used for etherification include methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, 2 ethyl butanol, and 2-ethyl hexanol.
- the amino resin is preferably a melamine resin (C).
- the melamine resin (C) includes known melamine resins, and in particular, a methyl etherified melamine resin obtained by partially or completely etherifying a methylol group of a partially or completely methylolated melamine resin with methyl alcohol.
- Preferred is a methylated butyl mixed etherified melamine resin.
- the melamine resin (C) is preferably from about 400 to about 6,000, more preferably from about 500 to about 4,000, and even more preferably from about 600 to about 600 from the viewpoint of improving the water resistance of the resulting coating film. It has a weight average molecular weight of about 3,000.
- the melamine resin (C) is commercially available.
- the water-based colored paint (Y 1 ) contains a melamine resin (C)
- the water-based colored paint (Y 1 ) contains a melamine resin, a hydroxyl group-containing resin (A), a block polyisocyanate compound (B) and a melamine resin
- the hydroxyl group-containing resin (A), the blocked polyisocyanate compound (B) and the melamine resin (C) are each preferably about 10 to about 90 parts by mass and about 5 to About 85 parts by weight and about 5 to about 40 parts by weight, more preferably about 15 to about 80 parts by weight, about 7 to about 75 parts by weight and about 7 to about 35 parts by weight, and more preferably about 20 parts by weight.
- the aqueous coloring paint (Y 1 ) preferably further contains a pigment.
- the pigment include color pigments, extender pigments, glitter pigments, and the like, and any combination thereof, and the aqueous colored paint (Y 1 ) contains at least one of a color pigment and a glitter pigment. It is preferable.
- color pigment examples include titanium oxide, zinc white, carbon black, molybdenum red, Prussian blue, cobalt blue, azo pigment, phthalocyanine pigment, quinacridone pigment, isoindoline pigment, selenium pigment, and perylene pigment. , Dioxazine pigments, diketopyrrolopyrrole pigments, etc., and any combination thereof.
- the water-based color paint (Y 1 ) is based on 100 parts by weight of the resin solid content meter in the water-colored paint (Y 1 ). Generally from about 1 to about 150 parts by weight, preferably from about 3 to about 130 parts by weight, and more preferably from about 5 to about 110 parts by weight.
- the bright pigment examples include aluminum (including vapor-deposited aluminum), copper, zinc, brass, nickel, aluminum oxide, mica, titanium oxide, aluminum oxide coated with iron oxide, titanium oxide, iron oxide, and the like. Mica, glass flakes, holographic pigments, etc., as well as any combination thereof.
- the glitter pigment is preferably aluminum, aluminum oxide, mica, titanium oxide, aluminum oxide coated with iron oxide, and mica coated with titanium oxide, iron oxide, etc., and more preferably aluminum. preferable.
- the aluminum includes non-leafing aluminum and leafing aluminum.
- the water-based colored paint (Y 1 ) contains the glitter pigment
- the water-colored paint (Y 1 ) contains the glitter pigment as a solid content meter of the hydroxyl group-containing resin (A) and the block polyisocyanate compound (B). Based on 100 parts by weight, it generally contains from about 1 to about 50 parts by weight, preferably from about 2 to about 30 parts by weight, and more preferably from about 3 to about 20 parts by weight.
- the water-based colored paint (Y 1 ) preferably further contains a hydrophobic solvent from the viewpoint of improving the smoothness of the coating film to be formed, the sharpness, and the resistance to cracking.
- the hydrophobic solvent has a solubility in 100 g of water at 20 ° C. of preferably about 10 g or less, more preferably about 5 g or less, and even more preferably about 1 g or less.
- hydrophobic solvent examples include hydrocarbon solvents such as rubber volatile oil, mineral spirit, toluene, xylene and solvent naphtha; 1-hexanol, 1-octanol, 2-octanol, 2-ethyl-1-hexanol, 1 -Decanol, benzyl alcohol, ethylene glycol mono-2-ethylhexyl ether, propylene glycol mono-n-butyl ether, dipropylene glycol mono-n-butyl ether, tripropylene glycol mono-n-butyl ether, propylene glycol mono-2-ethylhexyl ether, Alcohol solvents such as propylene glycol monophenyl ether; solvents such as n-butyl acetate, isobutyl acetate, isoamyl acetate, methyl amyl acetate, ethylene glycol monobutyl ether Ether solvents; methyl isobutyl ketone
- the water-based colored paint (Y 1 ) contains the hydrophobic solvent
- the water-colored paint (Y 1 ) contains the hydrophobic solvent as a solid of a hydroxyl group-containing resin (A) and a block polyisocyanate compound (B).
- it is contained in the range of about 2 to about 100 parts by weight, more preferably about 5 to about 80 parts by weight, and still more preferably about 8 to about 60 parts by weight, based on 100 parts by weight of the total.
- the water-based colored paint (Y 1 ) may be a thickener, a curing catalyst, an ultraviolet absorber, a light stabilizer, an antifoaming agent, a plasticizer, an organic solvent other than the hydrophobic solvent, a surface conditioner, a precipitation, if desired. It can further contain paint additives such as inhibitors.
- the thickener examples include inorganic thickeners such as silicate, metal silicate, montmorillonite, colloidal alumina; copolymer of (meth) acrylic acid and (meth) acrylic ester, poly Polyacrylic acid thickeners such as sodium acrylate; one molecule has a hydrophilic part and a hydrophobic part, and in an aqueous medium, the hydrophobic part adsorbs to the surface of pigments and emulsion particles in the paint , An associative thickener exhibiting a thickening action due to the association of the hydrophobic parts; a fibrous derivative thickener such as carboxymethylcellulose, methylcellulose, hydroxyethylcellulose; casein, sodium caseinate, ammonium caseinate, etc.
- inorganic thickeners such as silicate, metal silicate, montmorillonite, colloidal alumina
- copolymer of (meth) acrylic acid and (meth) acrylic ester poly Polyacrylic acid thickeners such as sodium acrylate
- Protein thickeners Alginate thickeners such as sodium alginate; Polyvinyl alcohol, Polyvinylpyrrolidone, Polyvinyl Polyvinyl thickeners such as rubenzyl ether copolymer; polyether thickeners such as pluronic polyether, polyether dialkyl ester, polyether dialkyl ether, and polyether epoxy modified product; vinyl methyl ether-maleic anhydride copolymer Examples thereof include a maleic anhydride copolymer thickener such as a partial ester of a polymer; a polyamide thickener such as a polyamideamine salt; and any combination thereof.
- polyacrylic acid thickeners are commercially available.
- ACRYSOL ASE-60 “ACRYSOL TT-615”, “ACRYSOL RM-5” (trade name) manufactured by Rohm and Haas, San Nopco Examples thereof include “SN thickener 613”, “SN thickener 618”, “SN thickener 630”, “SN thickener 634”, “SN thickener 636” (trade name) and the like.
- the above associative thickeners are commercially available, for example, “UH-420”, “UH-450”, “UH-462”, “UH-472”, “UH-540”, “UH” manufactured by ADEKA. -752 “,” UH-756VF “,” UH-814N “(trade name),” ACRYSOL RM-8W “,” ACRYSOL RM-825 “,” ACRYSOL RM-2020NPR “manufactured by Rohm and Haas,””ACRYSOLRM-12W”,”ACRYSOLSCT-275” (named above), “SN thickener 612", “SN thickener 621N”, “SN thickener 625N”, “SN thickener 627N”, “SN thickener” manufactured by San Nopco 660T “(above, trade name).
- Examples of the polyamide thickener include “AQ-630” and “AQ-870” (above, trade names) manufactured by Enomoto Kasei Co., Ltd.
- the water-based colored paint (Y 1 ) contains a thickener
- the water-colored paint (Y 1 ) is a solid content meter of the hydroxyl group-containing resin (A) and the block polyisocyanate compound (B). Based on 100 parts by weight, it generally contains from about 0.01 to about 15 parts by weight, preferably from about 0.05 to about 10 parts by weight, and more preferably from about 0.1 to about 5 parts by weight.
- the water-based colored paint (Y 1 ) comprises a hydroxyl group-containing resin (A) and a blocked polyisocyanate compound (B), and optionally pigments, hydrophobic solvents and other paint additives in an aqueous medium by known methods.
- the aqueous medium include deionized water or a mixture of deionized water and a hydrophilic organic solvent.
- the hydrophilic organic solvent include ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monopropyl ether, and the like.
- the aqueous colored paint (Y 1 ) generally has a solids concentration in the range of about 10 to about 60% by weight, preferably about 15 to about 50% by weight, more preferably about 20 to about 40% by weight.
- solid content of paints, resins, and the like means non-volatile components remaining after drying at 110 ° C. for 1 hour.
- the solid content of the coating means a non-volatile component such as a base resin, a curing agent, or a pigment contained in the coating that remains after drying at 110 ° C. for 1 hour.
- the solid content concentration of the paint is determined by measuring the paint in a heat-resistant container such as an aluminum foil cup, spreading the paint on the bottom of the container, and then drying at 110 ° C. for 1 hour. It can be calculated by weighing and determining the ratio of the mass of the paint component remaining after drying to the total mass of the paint before drying.
- the coating method of the water-based colored paint (Y 1 ) is not particularly limited, and examples thereof include air spray coating, airless spray coating, rotary atomization coating, curtain coat coating, and the like, such as air spray coating and rotary atomization coating. Is preferred. When applying, electrostatic application may be applied if desired.
- the aqueous colored paint (Y 1 ) is applied such that the cured film thickness is generally in the range of about 3 to about 50 ⁇ m, preferably about 5 to about 35 ⁇ m, and more preferably about 10 to about 20 ⁇ m. .
- the use of the water-based colored paint (Y 1 ) includes the following as at least a part of the reason why the smoothness, sharpness and water-resistant adhesion are excellent.
- the block polyisocyanate compound (B) in the water-based colored paint (Y 1 ) has a hydrocarbon group having a specific branched structure, when the water-based colored paint for base coat is applied on the primer coating film. Since the mixed layer between the uncured primer coating film and the uncured base coat film is suppressed, the smoothness and sharpness of the formed multilayer coating film are improved.
- the block polyisocyanate compound (B) has a hydrophilic group, the storage stability is improved, and the water-resistant adhesion after storage is improved.
- step 1-3 an object to be coated having an uncured primer coating and an uncured base coat coating is applied with a clear coating (Z), and an uncured clear coating is formed thereon.
- the uncured base coat film is preheated (pre-dried) under the condition that the base coat film is not substantially cured before applying the clear paint (Z) from the viewpoint of preventing the occurrence of coating film defects such as armpits. ) Or air blow.
- the preheating is preferably at a temperature of about 40 to about 100 ° C., more preferably about 50 to about 90 ° C., and more preferably about 60 to about 80 ° C., preferably about 30 seconds to about 15 minutes, more preferably It is carried out by heating for about 1 minute to about 10 minutes, and more preferably for about 2 minutes to about 5 minutes.
- the air blowing can be performed by blowing air heated to a room temperature or a temperature of about 25 to about 80 ° C. for about 30 seconds to about 15 minutes.
- the base coat film is subjected to the above preheating, air blowing, etc., if desired, before applying the clear paint (Z).
- the solids concentration of the coating is generally in the range of about 60 to about 100% by weight, preferably about 80 to about 100% by weight, and more preferably about 90 to about 100% by weight. It is preferable to adjust to.
- the clear paint (Z) examples include known thermosetting clear paint compositions for coating automobile bodies, automobile parts, household electrical appliances, and the like.
- a base resin having a crosslinkable functional group and an organic solvent-type thermosetting coating containing a crosslinking agent examples include powder slurry paints, and the clear paint (Z) is preferably an organic solvent thermosetting paint.
- crosslinkable functional group examples include a carboxyl group, a hydroxyl group, an epoxy group, a silanol group, an alkoxysilyl group, and a reactive unsaturated group.
- base resin having a crosslinkable functional group examples include acrylic resin, polyester resin, alkyd resin, urethane resin, epoxy resin, and fluororesin.
- crosslinking agent examples include polyisocyanate compounds having an unblocked isocyanate group, blocked polyisocyanate compounds, melamine resins, urea resins, carboxyl group-containing compounds, carboxyl group-containing resins, epoxy group-containing resins, and epoxy groups. Examples thereof include compounds.
- polyisocyanate compound having an unblocked isocyanate group examples include “polyisocyanate compound (b 1 )” described in the section “Block polyisocyanate compound (B)”.
- a polyisocyanate compound (b 1 ) may be a known blocking agent, for example, an alcohol type, a phenol type, an oxime type, an amine type, an acid amide type, Examples thereof include those blocked with a blocking agent such as imidazole, pyridine, and mercaptan.
- the base resin / crosslinking agent combination in the clear coating (Z) includes carboxyl group-containing resin / epoxy group-containing resin, hydroxyl group-containing resin / polyisocyanate compound, hydroxyl group-containing resin / blocked polyisocyanate compound, hydroxyl group-containing resin / melamine resin. Etc. are preferred.
- the clear paint (Z) can be a one-component paint or a multi-component paint such as a two-component urethane resin paint, and when cured by heating at a temperature of about 70 ° C. or more and less than about 120 ° C.
- a one-component urethane resin paint containing a blocked polyisocyanate compound as a curing agent or a two-component urethane resin paint containing a polyisocyanate compound as a curing agent is preferable.
- the clear paint (Z) can contain coloring pigments, glitter pigments, dyes, etc. as long as it does not hinder the transparency, and extender pigments, ultraviolet absorbers, light stabilizers, antifoaming agents. Further, a thickener, a rust inhibitor, a surface conditioner and the like can be further contained.
- the clear paint (Z) is applied with an electrostatic application to an object having an uncured base coat film by a known method, for example, air spray coating, airless spray coating, rotary atomization coating, or the like.
- the coating may be performed while applying an electrostatic force.
- the clear paint (Z) is applied so that the cured film thickness is generally in the range of 10 to 80 ⁇ m, preferably 15 to 60 ⁇ m, and more preferably 20 to 50 ⁇ m.
- the uncured clear coating may also be allowed to stand at room temperature (25 ° C.) for about 1 to about 60 minutes, or at a temperature of about 40 to about 80 ° C., as desired, prior to steps 1-4. It can be preheated for 1 to about 60 minutes.
- step 1-4 the uncured primer coating, the uncured base coat coating, and the uncured clear coating are heated and cured.
- the uncured primer coating, the uncured base coating and the uncured clear coating can be cured by ordinary coating heating (baking) means such as hot air heating, infrared heating, high frequency heating, etc. .
- the uncured primer coating, uncured base coat coating, and uncured clear coating are preferably about 70 ° C. or more and less than about 120 ° C., more preferably from the viewpoint of energy saving and / or heat resistance of the substrate. Is heated at a temperature of about 70 to about 110 ° C, and more preferably about 80 to about 100 ° C.
- the uncured primer coating, uncured base coat coating, and uncured clear coating are preferably heated for about 10 to about 60 minutes, and more preferably for about 15 to about 40 minutes. Under the conditions described above, the uncured primer coating, the uncured base coat, and the uncured clear coating are cured.
- the first multilayer coating film forming method including steps 1-1 to 1-4 includes a primer coating film, a base coating film, and a clear coating film on an object to be coated such as an automobile body or an automobile part. It is suitable when the multilayer coating film to be formed is formed by a 3-coat 1-bake method.
- Method 2 includes steps 2-1 to 2-3.
- Step 2-1 the object to be coated is applied with the primer paint (X) to form an uncured primer coating on the object to be coated.
- Step 2-1 is the same as or similar to Step 1-1 of Method 1.
- Step 2-2 an object to be coated having an uncured primer coating is coated with a water-based colored paint (Y 2 ) for the top coating, and an uncured top coating is formed thereon.
- the water-based colored paint (Y 2 ) for the top coat film (hereinafter sometimes referred to as “water-colored paint (Y 2 )”) is a paint for the top coat film, and the hydroxyl group-containing resin (A) and block Contains a polyisocyanate compound (B).
- the water-based colored paint (Y 2 ) can contain the same components as those of the water-based colored paint (Y 1 ) for the base coat described in “Step 1-2” and is similar to the water-based colored paint (Y 1 ). It can be painted by the method.
- the water-based colored paint (Y 2 ) can further contain a curing agent other than the block polyisocyanate compound (B).
- the curing agent include known curing agents, particularly amino resins.
- the amino resin include those described in the section of “Water-colored paint (Y 1 )”, and melamine resin (C) is preferable.
- the water-based colored paint (Y 2 ) contains a melamine resin (C)
- the water-based colored paint (Y 2 ) contains a melamine resin, a hydroxyl group-containing resin (A), a block polyisocyanate compound (B) and a melamine resin
- the hydroxyl group-containing resin (A), the blocked polyisocyanate compound (B) and the melamine resin (C) are each preferably about 10 to about 90 parts by mass and about 5 to About 85 parts by weight and about 5 to about 40 parts by weight, more preferably about 15 to about 80 parts by weight, about 7 to about 75 parts by weight and about 7 to about 35 parts by weight, and more preferably about 20 parts by weight.
- Step 2-3 the uncured primer coating and the uncured top coat are heated and cured.
- Step 2-3 can be performed in the same manner as Step 1-4 of Method 1.
- the uncured primer film and / or the uncured topcoat film may be allowed to stand at room temperature (25 ° C.) for about 1 to about 60 minutes, if desired, before the next step. It can be preheated (preheated) or air blown at conditions that do not cure (eg, at a temperature of about 40 to about 80 ° C. for about 1 to about 60 minutes).
- the primer coating (X) has a cured film thickness generally in the range of about 3 to about 40 ⁇ m, preferably about 5 to about 30 ⁇ m, and more preferably about 7 to about 20 ⁇ m. Painted. Also, the water-based colored paint (Y 2 ) has a cured film thickness generally in the range of about 5 to about 50 ⁇ m, preferably about 10 to about 45 ⁇ m, and more preferably about 20 to about 40 ⁇ m. Painted.
- Method 2 is suitable when a multilayer coating film composed of a primer coating film and a top coating film is formed on an object to be coated such as an automobile body or an automobile part by a 2-coat 1-bake method.
- Step 3-1 the object to be coated is coated with a base coat water-colored paint (Y 1 ) to form an uncured base coat film on the object to be coated.
- the object to be coated is the same as the object to be described in “Step 1-1” of Method 1.
- the aqueous colored paint (Y 1 ) for base coat used in Method 3 has the same or similar composition as the aqueous colored paint (Y 1 ) for base coat described in “Step 1-1” of Method 1. And can be painted identically or similarly.
- Step 3-2 an object having an uncured base coat film is applied with a clear paint (Z), and a clear film is formed thereon.
- the clear paint (Z) has the same composition as the clear paint (Z) described in “Step 1-3” of Method 1 and can be applied in the same manner.
- Step 3-3 In step 3-3, the uncured base coat film and the uncured clear film are heated and cured. Step 3-3 can be carried out in the same manner as step 1-4 of method 1.
- the uncured basecoat film and / or uncured clear film may be allowed to stand at room temperature (25 ° C.) for about 1 to about 60 minutes, if desired, before the next step. It can be preheated (preheated) or air blown at conditions that do not cure (eg, at a temperature of about 40 to about 80 ° C. for about 1 to about 60 minutes).
- the aqueous colored paint (Y 1 ) has a cured film thickness generally in the range of about 3 to about 50 ⁇ m, preferably about 5 to about 35 ⁇ m, and more preferably about 10 to about 20 ⁇ m. So that it is painted.
- the clear paint (Z) is applied so that the cured film thickness is generally in the range of about 10 to about 80 ⁇ m, preferably about 15 to about 60 ⁇ m, and more preferably about 20 to about 45 ⁇ m.
- Method 3 is specifically suitable for forming a multilayer coating film comprising a base coating film and a clear coating film on an object to be coated such as an automobile body or an automobile part by a 2-coat 1-bake method.
- Part and % are based on mass.
- film thickness of a coating film is based on a cured coating film.
- the mixture was aged at 110 ° C. for 30 minutes, and a mixture of 1 part of azobisisobutyronitrile and 15 parts of ethylene glycol monobutyl ether was dropped into the reaction vessel over 1 hour. Further, after aging at 110 ° C. for 1 hour, the mixture was cooled, neutralized with dimethylaminoethanol in an equivalent amount, and deionized water was added to obtain a solution of a hydroxyl group-containing acrylic resin (A 1 -1). The solid content of the solution of the hydroxyl group-containing acrylic resin (A 1 -1) was 50%.
- the resulting mixed solution and glass beads having a diameter of about 1.3 mm as a dispersion media are added to a wide-mouth glass bottle, the wide-mouth glass bottle is sealed, and the pigment is dispersed for 4 hours using a paint shaker.
- a pigment dispersion (P-1) was obtained.
- the solution was discharged while being filtered through a 100 mesh nylon cloth to obtain a hydroxyl group-containing acrylic resin aqueous dispersion (A 11 -1) having an average particle size of 100 nm and a solid content of 30%.
- the hydroxyl group-containing acrylic resin in the obtained hydroxyl group-containing acrylic resin aqueous dispersion (A 11 -1) had an acid value of 17.2 mgKOH / g and a hydroxyl value of 27.2 mgKOH / g.
- Monomer emulsion for core 54 parts of deionized water, 3.1 parts of “ADEKA rear soap SR-1025”, 1.0 part of allyl methacrylate, 10.0 parts of styrene, 35.0 parts of n-butyl acrylate, 10.0 parts of methyl methacrylate, ethyl acrylate
- a monomer emulsion for the core part was obtained.
- Monomer emulsion for shell 50 parts of deionized water, 1.8 parts of “ADEKA rear soap SR-1025”, 0.04 part of ammonium persulfate, 5.3 parts of 2-hydroxyethyl acrylate, 2.6 parts of methacrylic acid, 8.0 parts of ethyl acrylate, Monomer emulsion for shell part was obtained by stirring 7.1 parts of methyl methacrylate.
- a hydroxyl group-containing acrylic resin aqueous dispersion (A 11 -2) to a hydroxyl group-containing acrylic resin aqueous dispersion (A 11 -6) were prepared in the same manner as in Production Example 19 except that the composition was changed as shown in Table 1 below. Obtained.
- the hydroxyl group-containing acrylic resin aqueous dispersion (A 11 -1), the hydroxyl group-containing acrylic resin aqueous dispersion (A 11 -3) to the hydroxyl group-containing acrylic resin aqueous dispersion (A 11 -6) are core-shell type hydroxyl groups. Corresponds to aqueous acrylic resin dispersion (A 111 ).
- Table 1 shows the composition (parts), solid content (%), acid value (mgKOH / g) and hydroxyl value (mgKOH / g) of the hydroxyl group-containing acrylic resin aqueous dispersions (A 11 -1) to (A 11 -6). ).
- AMA allyl methacrylate St: styrene nBA: n-butyl acrylate MMA: methyl methacrylate EA: ethyl acrylate HEMA: 2-hydroxyethyl methacrylate MAAc: methacrylic acid
- the condensation reaction product was diluted with 2-ethyl-1-hexanol to obtain a solution of a hydroxyl group-containing polyester resin (A 2 -2) having a solid content concentration of 70%.
- the obtained hydroxyl group-containing polyester resin (A 2 -2) had an acid value of 45 mgKOH / g, a hydroxyl value of 100 mgKOH / g, and a number average molecular weight of 2,500.
- Phosphate group-containing dispersion resin (PR-1) solution A mixed solvent containing 27.5 parts of methoxypropanol and 27.5 parts of isobutanol was added to a reaction vessel equipped with a thermometer, a thermostat, a stirrer, a reflux condenser, a nitrogen introducing tube and a dropping device, and Heated to °C, 25 parts of styrene, 27.5 parts of n-butyl methacrylate, 20 parts of “isostearyl acrylate” (trade name, branched organic alkyl acrylate, manufactured by Osaka Organic Chemical Industries), 4-hydroxybutyl 7.5 parts of acrylate, 15 parts of polymerizable unsaturated monomer containing phosphoric acid group (Note 2), 12.5 parts of 2-methacryloyloxyethyl acid phosphate, 10 parts of isobutanol, and 4 parts of tert-butyl peroxyoctanoate 121.5 parts of
- a mixture containing 0.5 part of tert-butyl peroxyoctanoate and 20 parts of isopropanol was dropped into the reaction vessel over 1 hour.
- the contents were aged with stirring for 1 hour to obtain a solution of a phosphate group-containing dispersion resin (PR-1) having a solid content concentration of 50%.
- the phosphoric acid group-containing dispersion resin (PR-1) had an acid value derived from a phosphate group of 83 mgKOH / g, a hydroxyl value of 29 mgKOH / g, and a weight average molecular weight of 10,000.
- Phosphoric acid group-containing polymerizable unsaturated monomer To a reaction vessel equipped with a thermometer, a thermostat, a stirrer, a reflux condenser, a nitrogen introduction tube and a dropping device, 57.5 parts of monobutyl phosphoric acid and 41 parts of isobutanol were added, and the temperature of the reaction vessel was raised to 90 ° C. 42.5 parts of glycidyl methacrylate was dropped into the reaction vessel over 2 hours, and the contents were aged by stirring for 1 hour. Next, 59 parts of isopropanol was added to the reaction vessel to obtain a phosphate group-containing polymerizable unsaturated monomer solution having a solid content of 50%. The obtained phosphoric acid group-containing polymerizable unsaturated monomer had an acid value derived from a phosphoric acid group of 285 mgKOH / g.
- Example 1 The degreased polypropylene plate (PP plate) was air spray coated with the primer coating (X-1) obtained in Production Example 17 so that the cured film thickness was 15 ⁇ m, and the uncured PP plate was uncured on the PP plate. A primer coating was formed. A PP plate having an uncured primer coating was allowed to stand for 3 minutes, and then preheated at 60 ° C. for 3 minutes. Next, an electrostatic rotary atomizing coater was applied to the PP plate having an uncured primer coating with the water-based colored paint (Y 1 -1) obtained in Production Example 27 so that the cured film thickness was 15 ⁇ m. The uncoated base coat film was formed thereon.
- the PP plate having an uncured base coat film was allowed to stand for 5 minutes, and then preheated at 60 ° C. for 5 minutes.
- a PP plate having an uncured base coat film is applied to a clear paint “SOFLEX # 520 Clear” (trade name, polyisocyanate compound-containing two-component acrylic urethane organic solvent type clear paint, hereinafter “Clear”. Paint (Z-1) ”) was applied using an electrostatic rotary atomizer so that the cured film thickness was 35 ⁇ m, and an uncured clear coating film was formed thereon.
- a PP plate having an uncured clear coating film is allowed to stand for 7 minutes, and then heated at 80 ° C. for 30 minutes to cure the primer coating film, base coating film, and clear coating film, thereby producing a test plate. did.
- Examples 2 to 15 and Comparative Examples 1 to 5 As shown in Table 3 or Table 4 below, the water-based colored paint (Y 1 -1) was changed to any one of the water-based colored paint (Y 1 -2) to the water-based colored paint (Y 1 -20). A test plate was produced in the same manner as in Example 1.
- Example 16 As shown in Table 3 below, the clear paint (Z-1) is “Magiclon TC-71” (trade name, manufactured by Kansai Paint Co., Ltd., a thermosetting clear paint containing a hydroxyl group-containing acrylic resin and a melamine resin). A test plate was prepared in the same manner as in Example 1 except that it was changed to “Clear paint (Z-2)”.
- Example 17 and 18 As shown in Table 3 below, a test plate was produced in the same manner as in Example 1 except that the baking temperature was changed to 70 ° C or 115 ° C.
- Example 19 As shown in Table 3 below, a test plate was prepared in the same manner as in Example 1 except that the primer paint (X-1) was changed to the primer paint (X-2).
- Example 20 Degreased polypropylene plate (PP plate) was air-sprayed with the primer paint (X-1) obtained in Production Example 17 so that the cured film thickness was 20 ⁇ m, and uncured on the PP plate. A primer coating was formed. A PP plate having an uncured primer coating was allowed to stand for 3 minutes, and then preheated at 60 ° C. for 3 minutes. Next, an electrostatic rotary atomizing coater was applied to the PP plate having an uncured primer coating with the water-based colored paint (Y 2 -1) obtained in Production Example 47 so that the cured film thickness was 35 ⁇ m. The uncoated top coat film was formed thereon.
- a PP plate having an uncured top coat film is allowed to stand for 3 minutes, preheated at 60 ° C. for 3 minutes, and heated at 80 ° C. for 30 minutes to form an uncured primer film and an uncured top coat film. Were cured to prepare a test coated plate.
- Example 21 Cold-rolled steel sheet treated with zinc phosphate is electrocoated with a thermosetting epoxy resin-based cationic electrodeposition coating (trade name “Electron GT-10”, manufactured by Kansai Paint Co., Ltd.) so that the cured film thickness is 20 ⁇ m. Then, the cold-rolled steel sheet having the electrodeposition coating film was heated at 170 ° C. for 30 minutes to be cured. Cold rolled steel sheet with electrodeposition coating is coated with primer paint (trade name “TP-65-5”, manufactured by Kansai Paint Co., Ltd., polyester resin / amino resin organic solvent type paint composition) to a cured film thickness of 20 ⁇ m It coated so that it might become, and the uncured primer coating film was formed on it.
- primer paint trade name “TP-65-5”, manufactured by Kansai Paint Co., Ltd., polyester resin / amino resin organic solvent type paint composition
- a cold-rolled steel sheet having an uncured primer coating is allowed to stand for 5 minutes, pre-heated at 80 ° C. for 5 minutes, and then allowed to stand for 7 minutes. Apply the water-based colored paint (Y 1 -1) obtained in No. 27 with an electrostatic rotary atomizer so that the cured film thickness is 15 ⁇ m, and form an uncured base coat film on it. did.
- the cold-rolled steel sheet having an uncured base coat film is allowed to stand for 5 minutes and preheated at 60 ° C. for 5 minutes, and then the cold-rolled steel sheet having an uncured base coat film is coated with a clear paint (Z-1). Then, coating was carried out using an electrostatic rotary atomizer so that the cured film thickness was 35 ⁇ m, and an uncured clear coating film was formed thereon.
- a cold-rolled steel sheet having an uncured clear coating film is allowed to stand for 7 minutes and heated at 115 ° C. for 30 minutes, whereby the uncured primer coating film, the uncured base coating film, and the uncured clear coating film are heated. The film was cured to produce a test plate.
- Example 7 As shown in Table 4 below, a test plate was prepared in the same manner as in Example 21 except that the water-based colored paint (Y 1 -1) was changed to the water-based colored paint (Y 1 -16).
- Example 22 Cold-rolled steel sheet treated with zinc phosphate is electro-cured with a thermosetting epoxy resin cationic electrodeposition coating composition (trade name “Electron GT-10”, manufactured by Kansai Paint Co., Ltd.) so that the cured film thickness is 20 ⁇ m. Then, the cold-rolled steel sheet having an electrodeposition coating was heated at 170 ° C. for 30 minutes to be cured. Cold rolled steel sheet with electrodeposition coating is coated with primer paint (trade name “TP-65-5”, manufactured by Kansai Paint Co., Ltd.) using an electrostatic rotary atomizing coating machine so that the cured film thickness becomes 20 ⁇ m. And an uncured primer coating was formed thereon.
- a thermosetting epoxy resin cationic electrodeposition coating composition trade name “Electron GT-10”, manufactured by Kansai Paint Co., Ltd.
- primer paint trade name “TP-65-5”, manufactured by Kansai Paint Co., Ltd.
- a cold-rolled steel sheet having an uncured primer coating is allowed to stand for 5 minutes, pre-heated at 80 ° C. for 5 minutes, and then allowed to stand for 7 minutes. Apply the water-based colored paint (Y 2 -1) obtained in 47 with an electrostatic rotary atomizer so that the cured film thickness is 35 ⁇ m, and form an uncured top coat film on it. did.
- a cold-rolled steel sheet having an uncured top coat is allowed to stand for 3 minutes, preheated at 60 ° C. for 3 minutes, and heated at 115 ° C. for 30 minutes. The film was cured to produce a test coated plate.
- Example 23 Cold-rolled steel sheet treated with zinc phosphate is electro-cured with a thermosetting epoxy resin cationic electrodeposition coating composition (trade name “Electron GT-10”, manufactured by Kansai Paint Co., Ltd.) so that the cured film thickness is 20 ⁇ m. Then, the cold-rolled steel sheet having an electrodeposition coating was heated at 170 ° C. for 30 minutes to be cured. Next, the cold-rolled steel sheet having the electrodeposition coating film was coated with the water-based colored paint (Y 1 -1) obtained in Production Example 27 using an electrostatic rotary atomizing coating machine so that the cured film thickness was 20 ⁇ m. And an uncured base coat film was formed thereon.
- a thermosetting epoxy resin cationic electrodeposition coating composition trade name “Electron GT-10”, manufactured by Kansai Paint Co., Ltd.
- the cold-rolled steel sheet having an uncured base coat film is allowed to stand for 3 minutes and preheated at 60 ° C. for 3 minutes, and then the cold-rolled steel sheet having an uncured base coat film is coated with a clear paint (Z-1). Then, coating was carried out using an electrostatic rotary atomizer so that the cured film thickness was 35 ⁇ m, and an uncured clear coating film was formed thereon.
- a cold-rolled steel sheet having an uncured clear coating is allowed to stand for 3 minutes, pre-heated at 60 ° C. for 3 minutes, and heated at 115 ° C. for 30 minutes to thereby form an uncured base coat film and an uncured clear coating. The film was cured to produce a test coated plate.
- Example 9 As shown in Table 4 below, a test plate was prepared in the same manner as in Example 23 except that the water-based colored paint (Y 1 -1) was changed to the water-colored paint (Y 1 -16).
- Each test plate having a multilayer coating film was prepared using each water-based colored paint (Y) stored at 40 ° C. for 1 month. Each test plate is immersed in warm water of 40 ° C. for 240 hours, pulled up, and dried at 20 ° C. for 12 hours, and then the multilayer coating film of each test plate is cut into a lattice shape so as to reach the substrate with a cutter, 2 mm 100 100mm 2mm size gobang eyes were made. A cellophane tape was affixed to the surface, and the remaining state of the goby eye coating after the cellophane tape was rapidly peeled off at 20 ° C. was examined and evaluated according to the following criteria.
- Step 1-1 A step of applying an object to be coated with the primer paint (X) to form an uncured primer coating on the object to be coated.
- Step 1-2 A step of coating the object having the uncured primer coating with a water-based colored paint (Y 1 ) for base coat to form an uncured base coat on the coating,
- Step 1-3 An object to be coated having the uncured primer coating film and the uncured base coat film is applied with a clear coating (Z), and an uncured clear coating film is formed thereon.
- the aqueous coloring paint (Y 1 ) is a hydroxyl group-containing resin (A) and the following general formula (I): (Wherein R 1 , R 2 , R 4 and R 5 independently represent a hydrocarbon group having 1 to 12 carbon atoms, and R 3 is a linear or branched group having 1 to 12 carbon atoms. Represents an alkylene group of A blocked isocyanate group represented by the following general formula (II): (Wherein R 2 , R 3 , R 4 and R 5 are as described above).
- Step 2-1 a step of applying an object to be coated with the primer paint (X) to form an uncured primer coating on the object to be coated
- Step 2-2 a step of coating the article having the uncured primer coating with a water-based colored paint (Y 2 ) for a top coating, and forming an uncured top coating on the coating
- Step 2-3 heating and curing the uncured primer coating and the uncured top coating
- the water-based coloring paint (Y 2 ) is a hydroxyl group-containing resin (A) and the following general formula (I): (Wherein R 1 , R 2 , R 4 and R 5 independently represent a hydrocarbon group having 1 to 12 carbon atoms, and R 3 is a linear or branched group having 1 to 12 carbon atoms.
- Step 3-1 a step of applying a water-based colored paint (Y 1 ) for a base coat to form an uncured base coat film on the substrate;
- Step 3-2 A step of coating the object having the uncured base coat film with a clear paint (Z) to form a clear film thereon, and
- Step 3-3 the uncured base coat A method for forming a multilayer coating film comprising the steps of heating and curing the coating film and the uncured clear coating film,
- the aqueous coloring paint (Y 1 ) is a hydroxyl group-containing resin (A) and the following general formula (I): (Wherein R 1 , R 2 , R 4 and R 5 independently represent a hydrocarbon group having 1 to 12 carbon atoms, and R 3 is a linear or branched group having 1 to 12 carbon atoms.
- the block polyisocyanate compound (B) is represented by the following general formula (IV): Wherein R 1 is as described above and each R 1 is the same or different from each other.
- the block polyisocyanate compound (B) is represented by the following general formula (V): (Wherein R 6 is as described above, and R 7 represents a hydrocarbon group having 1 to 12 carbon atoms)
- the aqueous colored paint (Y 1 ) or the aqueous colored paint (Y 2 ) is a hydroxyl group-containing resin (A) and a block polyisocyanate compound (B), and a solid content of the hydroxyl group-containing resin (A) and the block polyisocyanate compound (B).
- the aqueous colored paint (Y 1 ) or the aqueous colored paint (Y 2 ) further contains a melamine resin (C), and the aqueous colored paint (Y 1 ) or the aqueous colored paint (Y 2 ) is a hydroxyl group-containing resin (A).
- the block polyisocyanate compound (B) and the melamine resin (C) are each based on 100 parts by mass of the solid content meter of the hydroxyl group-containing resin (A), the block polyisocyanate compound (B), and the melamine resin (C), respectively.
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Abstract
Description
しかし、従来の水性ベースコート塗料(水性上塗り塗料)及び複層塗膜形成方法においては、低温で加熱すると、複層塗膜の硬化が不十分であり、複層塗膜の付着性、耐水性等が低下する場合があった。
本発明の第1の複層塗膜形成方法(以下、「方法I」と称する場合がある)は、下記の工程1-1~1-4、
工程1-1:被塗物を、プライマー塗料(X)で塗装し、上記被塗物の上に未硬化のプライマー塗膜を形成する工程、
工程1-2:上記未硬化のプライマー塗膜を有する被塗物を、ベースコート用の水性着色塗料(Y1)で塗装して、その上に未硬化のベースコート塗膜を形成する工程、
工程1-3:上記未硬化のプライマー塗膜と、上記未硬化のベースコート塗膜とを有する被塗物を、クリヤー塗料(Z)で塗装し、その上に未硬化のクリヤー塗膜を形成する工程、そして
工程1-4:上記未硬化のプライマー塗膜、上記未硬化のベースコート塗膜、及び上記未硬化のクリヤー塗膜を加熱し、硬化させる工程、
を含む複層塗膜形成方法であって、
水性着色塗料(Y1)が、水酸基含有樹脂(A)、並びに下記一般式(I):
で示されるブロックイソシアネート基、下記一般式(II):
で示されるブロックイソシアネート基、及び下記一般式(III):
で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物(B)を含有する、
ことを特徴とする。
工程2-1:被塗物を、プライマー塗料(X)で塗装し、上記被塗物の上に未硬化のプライマー塗膜を形成する工程、
工程2-2:上記未硬化のプライマー塗膜を有する被塗物を、上塗り塗膜用の水性着色塗料(Y2)で塗装し、その上に未硬化の上塗り塗膜を形成する工程、そして
上記未硬化のプライマー塗膜、及び上記未硬化の上塗り塗膜を加熱し、硬化させる工程、
を含む複層塗膜形成方法であって、
水性着色塗料(Y2)が、水酸基含有樹脂(A)、並びに上述の一般式(I)で示されるブロックイソシアネート基、上述の一般式(II)で示されるブロックイソシアネート基、及び上述の一般式(III)で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物(B)を含有することを特徴とする。
工程3-1:被塗物を、ベースコート用の水性着色塗料(Y1)で塗装し、上記被塗物の上に未硬化のベースコート塗膜を形成する工程、
工程3-2:上記未硬化のベースコート塗膜を有する被塗物を、クリヤー塗料(Z)で塗装し、その上にクリヤー塗膜を形成する工程、そして
工程3-3:上記未硬化のベースコート塗膜、及び上記未硬化のクリヤー塗膜を加熱し、硬化させる工程
を含む複層塗膜形成方法であって、
水性着色塗料(Y1)が、水酸基含有樹脂(A)、並びに上述の一般式(I)で示されるブロックイソシアネート基、上述の一般式(II)で示されるブロックイソシアネート基、及び上述の一般式(III)で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物(B)を含有することを特徴とする。
[第1の複層塗膜形成方法(方法1)]
方法1は、工程1-1~工程1-4を含む。
[工程1-1]
工程1-1では、被塗物を、プライマー塗料(X)で塗装し、上記被塗物の上に未硬化のプライマー塗膜を形成する。
本発明の複層塗膜形成方法において、被塗物としては、例えば、乗用車、トラック、オートバイ、バス等の自動車車体の外板部;バンパー等の自動車部品;携帯電話、オーディオ機器等の家庭電気製品の外板部等が挙げられる。上記被塗物としては、自動車車体の外板部及び自動車部品が好ましい。
方法1では、プライマー塗料(X)として、公知のプライマー塗料組成物を用いることができる。プライマー塗料(X)は、具体的には、例えば、被膜形成性樹脂、架橋剤、着色顔料、体質顔料、光輝性顔料及び溶媒を含有することが好ましい。また、プライマー塗料(X)は、所望により、紫外線吸収剤、光安定剤、硬化触媒、可塑剤、付着付与剤、相溶化剤、消泡剤、増粘剤、防錆剤、表面調整剤等の塗料添加剤を含有することができる。
上記架橋剤としては、例えば、メラミン樹脂、ポリイソシアネート化合物、ブロック化ポリイソシアネート化合物等が挙げられる。
プライマー塗料(X)は、公知の方法、例えば、エアスプレー塗装、エアレススプレー塗装、回転霧化塗装等によって塗装することができ、塗装の際、静電印加を行ってもよい。プライマー塗料(X)は、その硬化膜厚が、好ましくは約3~約40μm、より好ましくは約5~約30μm、そしてさらに好ましくは約7~約20μmの範囲にあるように塗装される。
工程1-2では、未硬化のプライマー塗膜を有する被塗物を、ベースコート用の水性着色塗料(Y1)で塗装して、その上に未硬化のベースコート塗膜を形成する。
未硬化のプライマー塗膜は、水性着色塗料(Y1)を塗装する前に、プライマー塗膜が実質的に硬化しない条件で、プレヒート(予備乾燥)されるか、又はエアブローされることができる。
プライマー塗料(X)で被塗物を塗装する際に、あらかじめ質量(M1)を測定しておいたアルミホイルも一緒に塗装する。次いで、未硬化のプライマー塗膜を有する被塗物をプレヒートした後且つ次の塗料が塗装される前に、上記アルミホイルを回収し、その質量(M2)を測定する。次いで、回収したアルミホイルを、110℃で60分間乾燥し、デシケーター内で室温(25℃)まで放冷した後に、上記アルミホイルの質量(M3)を測定し、以下の式に従って固形分濃度を求める。
上述の方法により、プライマー塗膜、ベースコート塗膜、及びクリヤー塗膜の任意の時点における固形分濃度を算出することができる。
で示されるブロックイソシアネート基、下記一般式(II):
で示されるブロックイソシアネート基、及び下記一般式(III):
で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物を含有する。
水酸基含有樹脂(A)としては、例えば、水酸基含有アクリル樹脂(A1)、水酸基含有ポリエステル樹脂(A2)、水酸基含有ポリウレタン樹脂(A3)、水酸基含有エポキシ樹脂、水酸基含有アルキド樹脂等、並びにそれらの任意の組み合わせが挙げられる。
水酸基含有アクリル樹脂(A1)は、例えば、水酸基含有重合性不飽和モノマー(a1)と、水酸基含有重合性不飽和モノマー(a1)と共重合可能な他の重合性不飽和モノマー(a2)(以下、「他の重合性不飽和モノマー(a2)」と称する)とを、公知の方法、例えば、有機溶媒中での溶液重合法、水中での乳化重合法、水中でのミニエマルション重合法等の方法で共重合することによって製造することができる。
例えば、メチル(メタ)アクリレート、エチル(メタ)アクリレート、n-プロピル(メタ)アクリレート、イソプロピル(メタ)アクリレート、n-ブチル(メタ)アクリレート、イソブチル(メタ)アクリレート、tert-ブチル(メタ)アクリレート、n-ヘキシル(メタ)アクリレート、n-オクチル(メタ)アクリレート、2-エチルヘキシル(メタ)アクリレート、ノニル(メタ)アクリレート、トリデシル(メタ)アクリレート、ラウリル(メタ)アクリレート、ステアリル(メタ)アクリレート、イソステアリル(メタ)アクリレート、シクロヘキシル(メタ)アクリレート、メチルシクロヘキシル(メタ)アクリレート、tert-ブチルシクロヘキシル(メタ)アクリレート、シクロドデシル(メタ)アクリレート、トリシクロデカニル(メタ)アクリレート等
イソボルニル(メタ)アクリレート等
(iii)アダマンチル基を有する重合性不飽和モノマー:
アダマンチル(メタ)アクリレート等
トリシクロデセニル(メタ)アクリレート等
(v)芳香環含有重合性不飽和モノマー:
ベンジル(メタ)アクリレート、スチレン、α-メチルスチレン、ビニルトルエン等
(vi)アルコキシシリル基を有する重合性不飽和モノマー:ビニルトリメトキシシラン、ビニルトリエトキシシラン、ビニルトリス(2-メトキシエトキシ)シラン、γ-(メタ)アクリロイルオキシプロピルトリメトキシシラン、γ-(メタ)アクリロイルオキシプロピルトリエトキシシラン等
パーフルオロブチルエチル(メタ)アクリレート、パーフルオロオクチルエチル(メタ)アクリレート等のパーフルオロアルキル(メタ)アクリレート;フルオロオレフィン等
(viii)マレイミド基等の光重合性官能基を有する重合性不飽和モノマー
(ix)ビニル化合物
N-ビニルピロリドン、エチレン、ブタジエン、クロロプレン、プロピオン酸ビニル、酢酸ビニル等
(メタ)アクリル酸、マレイン酸、クロトン酸、β-カルボキシエチルアクリレート等
(xi)含窒素重合性不飽和モノマー
(メタ)アクリロニトリル、(メタ)アクリルアミド、N,N-ジメチルアミノエチル(メタ)アクリレート、N,N-ジエチルアミノエチル(メタ)アクリレート、N,N-ジメチルアミノプロピル(メタ)アクリルアミド、メチレンビス(メタ)アクリルアミド、エチレンビス(メタ)アクリルアミド、グリシジル(メタ)アクリレートとアミン化合物との付加物等
アリル(メタ)アクリレート、1,6-ヘキサンジオールジ(メタ)アクリレート等
(xiii)エポキシ基含有重合性不飽和モノマー:
グリシジル(メタ)アクリレート、β-メチルグリシジル(メタ)アクリレート、3,4-エポキシシクロヘキシルメチル(メタ)アクリレート、3,4-エポキシシクロヘキシルエチル(メタ)アクリレート、3,4-エポキシシクロヘキシルプロピル(メタ)アクリレート、アリルグリシジルエーテル等
(xv)スルホン酸基を有する重合性不飽和モノマー:
2-アクリルアミド-2-メチルプロパンスルホン酸、2-スルホエチル(メタ)アクリレート、アリルスルホン酸、4-スチレンスルホン酸等;これらスルホン酸のナトリウム塩及びアンモニウム塩等
アシッドホスホオキシエチル(メタ)アクリレート、アシッドホスホオキシプロピル(メタ)アクリレート、アシッドホスホオキシポリ(オキシエチレン)グリコール(メタ)アクリレート、アシッドホスホオキシポリ(オキシプロピレン)グリコール(メタ)アクリレート等
2-ヒドロキシ-4-(3-メタクリロイルオキシ-2-ヒドロキシプロポキシ)ベンゾフェノン、2-ヒドロキシ-4-(3-アクリロイルオキシ-2-ヒドロキシプロポキシ)ベンゾフェノン、2,2’-ジヒドロキシ-4-(3-メタクリロイルオキシ-2-ヒドロキシプロポキシ)ベンゾフェノン、2,2’-ジヒドロキシ-4-(3-アクリロイルオキシ-2-ヒドロキシプロポキシ)ベンゾフェノン、2-(2’-ヒドロキシ-5’-メタクリロイルオキシエチルフェニル)-2H-ベンゾトリアゾール等
4-(メタ)アクリロイルオキシ-1,2,2,6,6-ペンタメチルピペリジン、4-(メタ)アクリロイルオキシ-2,2,6,6-テトラメチルピペリジン、4-シアノ-4-(メタ)アクリロイルアミノ-2,2,6,6-テトラメチルピペリジン、1-(メタ)アクリロイル-4-(メタ)アクリロイルアミノ-2,2,6,6-テトラメチルピペリジン、1-(メタ)アクリロイル-4-シアノ-4-(メタ)アクリロイルアミノ-2,2,6,6-テトラメチルピペリジン、4-クロトノイルオキシ-2,2,6,6-テトラメチルピペリジン、4-クロトノイルアミノ-2,2,6,6-テトラメチルピペリジン、1-クロトノイル-4-クロトノイルオキシ-2,2,6,6-テトラメチルピペリジン等
アクロレイン、ダイアセトンアクリルアミド、ダイアセトンメタクリルアミド、アセトアセトキシエチルメタクリレート、ホルミルスチロール、炭素数約4~約7のビニルアルキルケトン(例えば、ビニルメチルケトン、ビニルエチルケトン、ビニルブチルケトン)等
上記コア・シェル型の水酸基含有アクリル樹脂水分散液としては、重合性不飽和基を1分子中に2個以上有する重合性不飽和モノマー(I1)(以下、「モノマー(I1)」と称する場合がある)及び重合性不飽和基を1分子中に1個有する重合性不飽和モノマー(I2)(以下、「モノマー(I2)」と称する場合がある)を共重合成分とする、コア部としての共重合体(I)(以下、「コア部共重合体(I)」と称する場合がある)と、水酸基含有重合性不飽和モノマー(II1)、カルボキシル基含有重合性不飽和モノマー(II2)及びその他の重合性不飽和モノマー(II3)を共重合成分とする、シェル部としての共重合体(II)「以下、「シェル部共重合体(II)」と称する場合がある」とからなるコア・シェル型水酸基含有アクリル樹脂水分散液(A111)であることが好ましい。
本明細書において、上記疎水性重合性不飽和モノマーは、炭素数が約4以上、好ましくは約6~約18の直鎖状、分岐状又は環状の飽和又は不飽和の炭化水素基を有する重合性不飽和モノマーであり、水酸基含有重合性不飽和モノマー等の親水性基を有するモノマーは除外される。
シェル部共重合体(II)を形成する、水酸基含有重合性不飽和モノマー(II1)は、得られるコア・シェル型水酸基含有アクリル樹脂水分散液(A111)内のコア・シェル型水酸基含有アクリル樹脂に、ブロックポリイソシアネート化合物(B)と架橋反応する水酸基を導入することによって塗膜の耐水性等を向上させると共に、コア・シェル型水酸基含有アクリル樹脂水分散液(A111)の安定性を向上する機能を有する。
本明細書において、コア・シェル型水酸基含有アクリル樹脂水分散液(A111)の平均粒径は、サブミクロン粒度分布測定装置を用いて、常法により脱イオン水で希釈してから20℃で測定した値である。サブミクロン粒度分布測定装置としては、例えば、「COULTER N4型」(商品名、ベックマン・コールター社製)を用いることができる。
水酸基含有ポリエステル樹脂(A2)は、一般的には、酸成分とアルコール成分とのエステル化反応又はエステル交換反応によって製造することができる。
上記酸成分としては、ポリエステル樹脂の製造に際して、酸成分として一般的に使用される化合物が挙げられる。上記酸成分としては、例えば、脂肪族多塩基酸、脂環族多塩基酸、芳香族多塩基酸等、並びにそれらの無水物及びエステル化物を挙げることができる。
上記脂肪族多塩基酸、並びにそれらの無水物及びエステル化物としては、得られる塗膜の平滑性の観点から、アジピン酸及び/又はアジピン酸無水物であることが特に好ましい。
上記芳香族多塩基酸、並びにそれらの無水物及びエステル化物としては、フタル酸、無水フタル酸、イソフタル酸、トリメリット酸、及び無水トリメリット酸が好ましい。
また、水酸基含有ポリエステル樹脂(A2)は、上記樹脂の調製中又は調製後に、脂肪酸、モノエポキシ化合物、ポリイソシアネート化合物等で変性されたものであることができる。
また、水酸基含有ポリエステル樹脂(A2)がカルボキシル基を有する場合は、水酸基含有ポリエステル樹脂(A2)は、好ましくは約0.1~約55mgKOH/g、より好ましくは約3~約50mgKOH/g、そしてさらに好ましくは約7~約45mgKOH/gの酸価を有する。
水酸基含有ポリウレタン樹脂(A3)としては、例えば、脂肪族ジイソシアネート化合物、脂環族ジイソシアネート化合物及び芳香族ジイソシアネート化合物から成る群から選択される少なくとも1種のジイソシアネート化合物と、ポリエーテルポリオール、ポリエステルポリオール及びポリカーボネートポリオールから成る群から選択される少なくとも1種のポリオール化合物とを反応させることにより製造された樹脂を挙げることができる。
例えば、脂肪族ジイソシアネート及び脂環族ジイソシアネートから成る群から選択される少なくとも1種のジイソシアネート、ポリエーテルジオール、ポリエステルジオール及びポリカーボネートジオールから成る群から選択される少なくとも1種のジオール、低分子量ポリヒドロキシ化合物並びにジメチロールアルカン酸を反応させてウレタンプレポリマーを製造する。上記ウレタンプレポリマーを3級アミンで中和し、当該中和物を水中に乳化分散させた後、所望によりポリアミン等の鎖伸長剤、架橋剤、停止剤等を含む水性媒体と混合して、イソシアネート基が実質的に無くなるまで反応させることにより、平均粒径が約0.001~約3μmの自己乳化型の水酸基含有ポリウレタン樹脂(A3)を得ることができる。
ブロックポリイソシアネート化合物(B)は、下記一般式(I):
で示されるブロックイソシアネート基、下記一般式(II):
で示されるブロックイソシアネート基、及び下記一般式(III):
で示されるブロックイソシアネート基から成る群から少なくとも1種のブロックイソシアネート基を有する。
ポリイソシアネート化合物(b1)は、1分子中に少なくとも2個のイソシアネート基を有する化合物であって、例えば、脂肪族ポリイソシアネート、脂環族ポリイソシアネート、芳香脂肪族ポリイソシアネート、芳香族ポリイソシアネート、及びそれらの誘導体等、並びにそれらの任意の組み合わせを挙げることができる。
ポリイソシアネート化合物(b1)中のイソシアネート基をブロック化する活性メチレン化合物(b2)としては、例えば、マロン酸ジメチル、マロン酸ジエチル、マロン酸ジn-プロピル、マロン酸ジイソプロピル、マロン酸ジn-ブチル、マロン酸ジイソブチル、マロン酸ジsec-ブチル、マロン酸ジtert-ブチル、マロン酸ジn-ペンチル、マロン酸ジn-ヘキシル、マロン酸ジ(2-エチルヘキシル)、マロン酸メチルイソプロピル、マロン酸エチルイソプロピル、マロン酸メチルn-ブチル、マロン酸エチルn-ブチル、マロン酸メチルイソブチル、マロン酸エチルイソブチル、マロン酸メチルsec-ブチル、マロン酸エチルsec-ブチル、マロン酸ジフェニル及びマロン酸ジベンジル等のマロン酸ジエステル、アセト酢酸メチル、アセト酢酸エチル、アセト酢酸n-プロピル、アセト酢酸イソプロピル、アセト酢酸n-ブチル、アセト酢酸イソブチル、アセト酢酸sec-ブチル、アセト酢酸tert-ブチル、アセト酢酸n-ペンチル、アセト酢酸n-ヘキシル、アセト酢酸2-エチルヘキシル、アセト酢酸フェニル及びアセト酢酸ベンジル等のアセト酢酸エステル、イソブチリル酢酸メチル、イソブチリル酢酸エチル、イソブチリル酢酸n-プロピル、イソブチリル酢酸イソプロピル、イソブチリル酢酸n-ブチル、イソブチリル酢酸イソブチル、イソブチリル酢酸sec-ブチル、イソブチリル酢酸tert-ブチル、イソブチリル酢酸n-ペンチル、イソブチリル酢酸n-ヘキシル、イソブチリル酢酸2-エチルヘキシル、イソブチリル酢酸フェニル及びイソブチリル酢酸ベンジル等のイソブチリル酢酸エステル等、並びにそれらの任意の組み合わせが挙げられる。
従って、ブロックポリイソシアネート化合物(B)は、そのイソシアネート基の一部が、活性メチレン化合物(b2)以外のブロック剤によりブロックされているものを含む。
上記水酸基含有化合物としては、例えば、プロパノール、ブタノール、ペンタノール、ヘキサノール、ヘプタノール、2-エチル-1-ヘキサノール、オクタノール、ノナノール、デカノール、トリデカノール、ステアリルアルコール、エチレングリコール、プロピレングリコール、ポリエチレングリコール、ポリプロピレングリコール、ポリエチレングリコール(プロピレングリコール)、ポリエチレングリコールモノアルキルエーテル、ポリプロピレングリコールモノアルキルエーテル、ポリエチレングリコール(プロピレングリコール)モノアルキルエーテル、トリメチロールプロパン等、並びにそれらの任意の組み合わせが挙げられる。
上記比率は、水性着色塗料(Y1)の貯蔵安定性並びに形成される複層塗膜の平滑性及び鮮映性の観点から、約0.04以上であることがより好ましく、そして約0.05以上であることがさらに好ましい。
親水基を有するブロックポリイソシアネート化合物(B’)は、例えば、上記活性水素含有化合物として、親水基を有する活性水素含有化合物を用いることによって得られる。
上記比率は、水性着色塗料(Y1)の貯蔵安定性並びに形成される複層塗膜の平滑性及び鮮映性の観点から、約0.04以上であることがより好ましく、そして約0.05以上であることがさらに好ましい。
ブロックポリイソシアネート化合物前駆体(b3)は、1分子中に2個以上のイソシアネート基を有するポリイソシアネート化合物(b1)及び活性メチレン化合物(b2)を反応させることにより形成されうる、ポリイソシアネート化合物(b1)中のイソシアネート基の一部又は全部が、活性メチレン化合物(b2)でブロック化された化合物である。
で示されるブロックイソシアネート基を有する、ブロックポリイソシアネート化合物前駆体(b31)、及び下記一般式(V):
で示されるブロックイソシアネート基を有する、ブロックポリイソシアネート化合物前駆体(b32)の少なくとも一方であることが好ましい。
ブロックポリイソシアネート化合物前駆体(b31)は、ブロックポリイソシアネート化合物(B)の原料の一つである上記活性メチレン化合物(b2)として、比較的簡易に製造又は入手できる活性メチレン化合物を使用できる観点から、R1が、炭素数約1~約3のアルキル基であることが好ましい。
ブロックポリイソシアネート化合物前駆体(b32)は、ブロックポリイソシアネート化合物(B)の原料の一つである活性メチレン化合物(b2)として、比較的簡易に製造又は入手できる活性メチレン化合物を使用できる観点から、R6及びR7が、炭素数約1~約3のアルキル基であることが好ましい。
ブロックポリイソシアネート化合物(B)は、例えば、ブロックポリイソシアネート化合物前駆体(b3)と、2級アルコールとを反応させることにより製造されることができる。
上記2級アルコールとしては、特に制限されないが、下記一般式(VI):
を有することが好ましい。
で示されるブロックイソシアネート基を有する、ブロックポリイソシアネート化合物前駆体(b31)と、2級アルコール(b4)とを反応させることによって製造されうる。
で示される基に置換される。
で示されるブロックイソシアネート基、又は下記一般式(II):
で示されるブロックイソシアネート基を有する。
で示されるブロックイソシアネート基を有する、ブロックポリイソシアネート化合物前駆体(b32)と、2級アルコール(b4)とを反応させることによって製造されうる。
で示される基に置換される。
で示されるブロックイソシアネート基を有する。
ベースコート用の水性着色塗料(Y1)(以下、「水性着色塗料(Y1)」と称する場合がある)は、水酸基含有樹脂(A)及びブロックポリイソシアネート化合物(B)を含有する水性塗料組成物である。
上記疎水性溶媒は、20℃において、好ましくは約10g以下、より好ましくは約5g以下、そしてさらに好ましくは約1g以下の、100gの水に対する溶解度を有する。
上記ポリアマイド系増粘剤としては、楠本化成社製の「AQ-630」、「AQ-870」(以上、商品名)等が挙げられる。
本明細書において、塗料、樹脂等の「固形分」は110℃で1時間乾燥させた後に残存する不揮発性成分を意味する。例えば、塗料の固形分は、110℃で1時間乾燥させた後に残存する、塗料に含有される基体樹脂、硬化剤、顔料等の不揮発性成分を意味する。このため、塗料の固形分濃度は、アルミ箔カップ等の耐熱容器に塗料を量り取り、容器底面に塗料を塗り広げた後、110℃で1時間乾燥させ、乾燥後に残存する塗料成分の質量を秤量して、乾燥前の塗料の全質量に対する乾燥後に残存する塗料成分の質量の割合を求めることにより、算出することができる。
第1に、水性着色塗料(Y1)中のブロックポリイソシアネート化合物(B)が、特定の分岐構造の炭化水素基を有するため、プライマー塗膜上にベースコート用の水性着色塗料を塗装した際に、未硬化のプライマー塗膜と、未硬化のベースコート塗膜との間の混層が抑制されるため、形成される複層塗膜の平滑性及び鮮映性が向上する。
第2に、ブロックポリイソシアネート化合物(B)が親水基を有するため、貯蔵安定性が向上し、そして貯蔵後の耐水付着性が向上する。
工程1-3では、未硬化のプライマー塗膜と、未硬化のベースコート塗膜とを有する被塗物を、クリヤー塗料(Z)で塗装し、その上に未硬化のクリヤー塗膜を形成する。
クリヤー塗料(Z)としては、例えば、自動車車体、自動車部品、家庭電気製品等の塗装用として公知の熱硬化性クリヤー塗料組成物が挙げられる。具体的には、クリヤー塗料(Z)として、架橋性官能基を有する基体樹脂及び架橋剤を含有する有機溶剤型熱硬化性塗料、水性熱硬化性塗料、熱硬化性粉体塗料、熱硬化性粉体スラリー塗料等を挙げることができ、クリヤー塗料(Z)は、有機溶剤型熱硬化性塗料であることが好ましい。
上記ブロック化ポリイソシアネート化合物としては、本明細書に記載されるものの他、ポリイソシアネート化合物(b1)を公知のブロック剤、例えば、アルコール系、フェノール系、オキシム系、アミン系、酸アミド系、イミダゾール系、ピリジン系、メルカプタン系等のブロック剤でブロックしたものが挙げられる。
工程1-4では、未硬化のプライマー塗膜、未硬化のベースコート塗膜、及び未硬化のクリヤー塗膜を加熱し、硬化させる。
未硬化のプライマー塗膜、未硬化のベースコート塗膜及び未硬化のクリヤー塗膜は、通常の塗膜の加熱(焼付け)手段、例えば、熱風加熱、赤外線加熱、高周波加熱等により硬化させることができる。
方法2は、工程2-1~工程2-3を含む。
[工程2-1]
工程2-1では、被塗物を、プライマー塗料(X)で塗装し、上記被塗物の上に未硬化のプライマー塗膜を形成する。
工程2-1は、方法1の工程1-1と同一又は同様である。
工程2-2では、未硬化のプライマー塗膜を有する被塗物を、上塗り塗膜用の水性着色塗料(Y2)で塗装し、その上に未硬化の上塗り塗膜を形成する。
上塗り塗膜用の水性着色塗料(Y2)(以下、「水性着色塗料(Y2)」と称する場合がある)は、上塗り塗膜用の塗料であり、そして水酸基含有樹脂(A)及びブロックポリイソシアネート化合物(B)を含有する。
水性着色塗料(Y2)は、「工程1-2」で説明される、ベースコート用の水性着色塗料(Y1)と同様の成分を含むことができ、そして水性着色塗料(Y1)と同様の方法で塗装することができる。
上記アミノ樹脂としては、「水性着色塗料(Y1)」の箇所で説明されるものが挙げられ、そしてメラミン樹脂(C)であることが好ましい。
工程2-3では、未硬化のプライマー塗膜、及び未硬化の上塗り塗膜を加熱し、硬化させる。
工程2-3は、方法1の工程1-4と同様に実施することができる。
方法3は、工程3-1~工程3-3を含む。
[工程3-1]
工程3-1では、被塗物を、ベースコート用の水性着色塗料(Y1)で塗装し、被塗物の上に未硬化のベースコート塗膜を形成する。
上記被塗物は、方法1の「工程1-1」で説明される被塗物と同一である。
方法3で用いられるベースコート用の水性着色塗料(Y1)は、方法1の「工程1-1」で説明される、ベースコート用の水性着色塗料(Y1)と同一又は同様の組成を有し、そして同一又は同様に塗装することができる。
工程3-2では、未硬化のベースコート塗膜を有する被塗物を、クリヤー塗料(Z)で塗装し、その上にクリヤー塗膜を形成する。
クリヤー塗料(Z)は、方法1の「工程1-3」で説明されるクリヤー塗料(Z)と同一の組成を有し、そして同様に塗装することができる。
工程3-3では、未硬化のベースコート塗膜、及び未硬化のクリヤー塗膜を加熱し、硬化させる。
工程3-3は、方法1の工程1-4と同様に実施することができる。
[製造例1]
温度計、サーモスタット、攪拌装置、還流冷却器及び水分離器を備えた反応容器に、エチレングリコールモノブチルエーテル60部及びイソブチルアルコール15部を加え、窒素気流中で内容物を110℃に加温した。内容物の温度が110℃に達したら、スチレン10部、メチルメタクリレート48部、n-ブチルアクリレート26部、2-ヒドロキシエチルメタクリレート10部、アクリル酸6部及びアゾビスイソブチロニトリル1部の混合物を、反応容器内に3時間かけて滴下した。
[製造例2]
温度計、サーモスタット、攪拌装置、還流冷却器及び水分離器を備えた反応容器に、トリメチロールプロパン109部、1,6-ヘキサンジオール141部、1,2-シクロヘキサンジカルボン酸無水物126部及びアジピン酸120部を仕込み、内容物を160℃から230℃まで3時間かけて昇温させ、生成した縮合水を水分離器により留去させながら230℃で4時間、内容物を縮合反応させた。
[製造例3]
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」(商品名、住化バイエルウレタン社製、ヘキサメチレンジイソシアネート由来のイソシアヌレート構造含有ポリイソシアネート、固形分約100%、イソシアネート基含有率21.8%)480部、酢酸エチル150部及びマロン酸ジイソプロピル365部を仕込み、窒素気流下で内容物を攪拌した。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「デュラネートTPA-100」(商品名、旭化成ケミカルズ社製、ヘキサメチレンジイソシアネート由来のイソシアヌレート構造含有ポリイソシアネート、固形分約100%、イソシアネート基含有率23.0%)450部、酢酸エチル150部及びマロン酸ジエチル310部を仕込み、窒素気流下で内容物を攪拌した。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」480部、酢酸エチル150部、マロン酸ジイソプロピル330部及びアセト酢酸イソプロピル27部を仕込み、窒素気流下で内容物を攪拌した。反応容器にナトリウムメトキシドの28%メタノール溶液4部を加え、内容物を65℃で8時間攪拌した。得られた樹脂溶液中のイソシアネート量は0.08モル/Kgであった。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」480部、酢酸エチル150部、マロン酸ジエチル280部及びイソブチリル酢酸エチル30部を仕込み、窒素気流下で内容物を攪拌しながら、反応容器にナトリウムメトキシドの28%メタノール溶液4部を加え、65℃で8時間内容物を攪拌した。得られた樹脂溶液中のイソシアネート量は0.08モル/Kgであった。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」480部、酢酸エチル150部及びマロン酸ジイソプロピル360部を仕込み、窒素気流下で内容物を攪拌しながら、反応容器にナトリウムメトキシドの28%メタノール溶液4部を加え、65℃で8時間内容物を攪拌した。得られた樹脂溶液中のイソシアネート量は0.07モル/Kgであった。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「デュラネートTPA-100」450部、酢酸エチル150部及びマロン酸ジイソプロピル360部を仕込み、窒素気流下で内容物を攪拌しながら、反応容器にナトリウムメトキシドの28%メタノール溶液4部を加え、65℃で8時間内容物を攪拌した。得られた樹脂溶液中のイソシアネート量は0.07モル/Kgであった。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」480部、酢酸エチル150部及びマロン酸ジエチル310部を仕込み、窒素気流下で内容物を攪拌しながら、ナトリウムメトキシドの28%メタノール溶液4部を加え、65℃で8時間内容物を攪拌した。得られた樹脂溶液中のイソシアネート量は0.06モル/Kgであった。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」480部、酢酸エチル150部及びマロン酸ジエチル310部を仕込み、窒素気流下で内容物を攪拌しながら、反応容器にナトリウムメトキシドの28%メタノール溶液4部を加え、65℃で8時間内容物を攪拌した。得られた樹脂溶液中のイソシアネート量は0.06モル/Kgであった。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」480部、酢酸エチル150部及びマロン酸ジエチル310部を仕込み、窒素気流下で内容物を攪拌しながら、反応容器にナトリウムメトキシドの28%メタノール溶液4部を加え、65℃で8時間内容物を攪拌した。得られた樹脂溶液中のイソシアネート量は0.06モル/Kgであった。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」480部、酢酸エチル150部及びマロン酸ジエチル310部を仕込み、窒素気流下で内容物を攪拌しながら、ナトリウムメトキシドの28%メタノール溶液4部を加え、65℃で8時間内容物を攪拌した。得られた樹脂溶液中のイソシアネート量は0.06モル/Kgであった。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」360部、「ユニオックスM-550」(日油社製、ポリエチレングリコールモノメチルエーテル、平均分子量 約550)60部及び2,6-ジ-tert-ブチル-4-メチルフェノール0.2部を仕込み、窒素気流下で内容物を攪拌しながら、130℃で3時間加熱した。
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管、滴下装置及び除去溶媒簡易トラップを備えた反応容器に、「スミジュールN-3300」360部、「ユニオックスM-400」(日油社製、ポリエチレングリコールモノメチルエーテル、平均分子量 約400)50部、「PEG#600」(日油社製、ポリエチレングリコール、平均分子量約600)5部及び2,6-ジ-tert-ブチル-4-メチルフェノール0.2部を仕込み、窒素気流下で内容物を攪拌しながら、130℃で3時間加熱した。
[製造例15]
混合容器に、製造例2で得られた水酸基含有ポリエステル樹脂(A2-1)の溶液42.9部(固形分30部)、「JR-806」(商品名、テイカ社製、ルチル型二酸化チタン)112部、「ケッチェンブラックEC600J」(商品名、ライオン社製、導電性カーボン)8部及び脱イオン水137.1部を添加し、次いで2-(ジメチルアミノ)エタノールを添加して、内容物のpHを8.0に調整し、混合溶液を得た。次いで、広口ガラスビンに、得られた混合溶液と、分散メジアとしての直径約1.3mmのガラスビーズとを添加し、広口ガラスビンを密封し、そしてペイントシェイカーを用いて、4時間顔料を分散させ、顔料分散液(P-1)を得た。
混合容器に、製造例2で得られた水酸基含有ポリエステル樹脂(A2-1)の溶液42.9部(固形分30部)、「JR-806」(商品名、テイカ社製、ルチル型二酸化チタン)120部及び脱イオン水137.1部を添加し、次いで2-(ジメチルアミノ)エタノールを添加して、内容物のpHを8.0に調整し、混合溶液を得た。次いで、広口ガラスビンに得られた混合溶液と、分散メジアとしての直径約1.3mmφのガラスビーズとを添加し、広口ガラスビンを密封し、そしてペイントシェイカーを用いて4時間顔料を分散させ、顔料分散液(P-2)を得た。
[製造例17]
製造例1で得られた水酸基含有アクリル樹脂(A1-1)の溶液30部(固形分15部)、「タケラックWS5000」50部(固形分15部)(商品名、三井武田ケミカル社製、ポリウレタンディスパージョン、シラノール基含有の自己架橋型、固形分30%)、「スーパークロンE-403」133.3部(固形分40部)(商品名、日本製紙社製、塩素化ポリプロピレンの水分散品、樹脂の塩素含有率15%、固形分30%)及び製造例15で得られた顔料分散液(P-1)300部を混合容器に添加し、内容物を混合し、次いで、「ACRYSOL ASE-60」(商品名、ロームアンドハース社製、ポリアクリル酸系増粘剤)、2-(ジメチルアミノ)エタノール及び脱イオン水により、pH、濃度及び粘度を調整し、8.0のpHと、45%の固形分濃度と、40秒の粘度(フォードカップNo.4,20℃)とを有する水性プライマー塗料(X-1)を得た。
製造例1で得られた水酸基含有アクリル樹脂(A1-1)の溶液10部(固形分5部)、「デュラネートMFK60X」16.7部(固形分10部)(商品名、旭化成(株)製、活性メチレン型ブロックポリイソシアネート化合物、固形分60%)、「タケラックWS5000」50部(固形分15部)(商品名、三井武田ケミカル社製、ポリウレタンディスパージョン、シラノール基含有の自己架橋型、固形分30%)、「スーパークロンE-403」133.3部(固形分40部)(商品名、日本製紙社製、塩素化ポリプロピレンの水分散品、樹脂の塩素含有率15%、固形分30%)及び製造例15で得られた顔料分散液(P-1)300部を混合容器に添加し、内容物を混合し、次いで、「ACRYSOL ASE-60」(商品名、ロームアンドハース社製、ポリアクリル酸系増粘剤)、2-(ジメチルアミノ)エタノール及び脱イオン水により、pH、濃度及び粘度を調整し、8.0のpHと、45%の固形分濃度と、40秒の粘度(フォードカップNo.4,20℃)とを有する水性プライマー塗料(X-2)を得た。
[製造例19]
温度計、サーモスタット、撹拌装置、還流冷却器、窒素導入管及び滴下装置を備えた反応容器に、脱イオン水120部及び「アデカリアソープSR-1025」(商品名、ADEKA社製、乳化剤、有効成分25%)0.8部を仕込み、窒素気流中で内容物を撹拌し、80℃に昇温させた。
脱イオン水54部、「アデカリアソープSR-1025」3.1部、アリルメタクリレート1.0部、スチレン10.0部、n-ブチルアクリレート35.0部、メチルメタクリレート10.0部、エチルアクリレート20.0部及び2-ヒドロキシエチルメタクリレート1.0部を攪拌することにより、コア部用モノマー乳化物を得た。
脱イオン水50部、「アデカリアソープSR-1025」1.8部、過硫酸アンモニウム0.04部、2-ヒドロキシエチルアクリレート5.3部、メタクリル酸2.6部、エチルアクリレート8.0部及びメチルメタクリレート7.1部を攪拌することにより、シェル部用モノマー乳化物を得た。
組成を下記表1に示すように変更した以外は、製造例19と同様にして、水酸基含有アクリル樹脂水分散液(A11-2)~水酸基含有アクリル樹脂水分散液(A11-6)を得た。
なお、水酸基含有アクリル樹脂水分散液(A11-1)、水酸基含有アクリル樹脂水分散液(A11-3)~水酸基含有アクリル樹脂水分散液(A11-6)は、コア・シェル型水酸基含有アクリル樹脂水分散液(A111)に該当する。
表1に、水酸基含有アクリル樹脂水分散液(A11-1)~(A11-6)の組成(部)、固形分(%)、酸価(mgKOH/g)及び水酸基価(mgKOH/g)を示す。
AMA:アリルメタクリレート
St:スチレン
nBA:n-ブチルアクリレート
MMA:メチルメタクリレート
EA:エチルアクリレート
HEMA:2-ヒドロキシエチルメタクリレート
MAAc:メタクリル酸
[製造例25]
温度計、サーモスタット、攪拌装置、還流冷却器及び水分離器を備えた反応容器に、トリメチロールプロパン109部、1,6-ヘキサンジオール141部、ヘキサヒドロ無水フタル酸146部及びアジピン酸139部を仕込み、3時間かけて160℃から230℃に昇温させた後、230℃で4時間縮合反応させた。次いで、得られた縮合反応生成物に、無水トリメリット酸28.8部をさらに加え、170℃で30分間反応させ、縮合反応生成物にカルボキシル基を導入した。次いで、縮合反応生成物を2-エチル-1-ヘキサノールで希釈し、固形分濃度70%の水酸基含有ポリエステル樹脂(A2-2)の溶液を得た。得られた水酸基含有ポリエステル樹脂(A2-2)は、45mgKOH/gの酸価と、100mgKOH/gの水酸基価と、2,500の数平均分子量とを有していた。
[製造例26]
混合容器に、アルミニウム顔料ペースト「GX-180A」(商品名、旭化成メタルズ社製、金属含有量74%)19部、2-エチル-1-ヘキサノール34.8部、リン酸基含有樹脂(PR-1)の溶液(注1)8部及び2-(ジメチルアミノ)エタノール0.2部を添加し、均一に混合することにより、光輝性顔料分散液(AL)を得た。
温度計、サーモスタット、撹拌器、還流冷却器、窒素導入管及び滴下装置を備えた反応容器に、メトキシプロパノール27.5部及びイソブタノール27.5部を含む混合溶剤を添加し、反応容器を110℃に加熱し、反応容器に、スチレン25部、n-ブチルメタクリレート27.5部、「イソステアリルアクリレート」(商品名、大阪有機化学工業社製、分岐高級アルキルアクリレート)20部、4-ヒドロキシブチルアクリレート7.5部、リン酸基含有重合性不飽和モノマー(注2)15部、2-メタクリロイルオキシエチルアシッドホスフェート12.5部、イソブタノール10部、及びtert-ブチルパーオキシオクタノエート4部を含む混合物121.5部を、4時間かけて添加した。
温度計、サーモスタット、撹拌器、還流冷却器、窒素導入管及び滴下装置を備えた反応容器に、モノブチルリン酸57.5部及びイソブタノール41部を添加し、反応容器を90℃に昇温し、反応容器にグリシジルメタクリレート42.5部を2時間かけて滴下し、そして内容物を1時間攪拌して熟成させた。次いで、反応容器にイソプロパノ-ル59部を加えて、固形分濃度50%のリン酸基含有重合性不飽和モノマーの溶液を得た。得られたリン酸基含有重合性不飽和モノマーは、285mgKOH/gのリン酸基に由来する酸価を有していた。
[製造例27]
製造例19で得られた水酸基含有アクリル樹脂水分散液(A11-1)133.3部(固形分40部)、製造例25で得られた水酸基含有ポリエステル樹脂(A2-2)の溶液51.4部(固形分36部)、製造例3で得られたブロックポリイソシアネート化合物(B-1)の溶液33.4部(固形分20部)、製造例26で得られた光輝性顔料分散液(AL)62部、及び2-エチル-1-ヘキサノール10部を混合容器に入れ、内容物を均一に混合し、そして「ACRYSOL ASE-60」、2-(ジメチルアミノ)エタノール及び脱イオン水により、pH、固形分濃度及び粘度を調整して、8.0のpHと、25%の固形分濃度と、40秒の粘度(フォードカップNo.4,20℃)とを有する水性着色塗料(Y1-1)を得た。
組成を、下記表2に示されるように変更した以外は、製造例27と同様にして、水性着色塗料(Y1-2)~水性着色塗料(Y1-20)を得た。
製造例19で得られた水酸基含有アクリル樹脂水分散液(A11-1)133.3部(固形分40部)、製造例25で得られた水酸基含有ポリエステル樹脂(A2-2)の溶液34.3部(固形分24部)、製造例3で得られたブロックポリイソシアネート化合物(B-1)の溶液41.7部(固形分25部)、製造例16で得られた顔料分散液(P-2)240部、及び2-エチル-1-ヘキサノール10部を混合容器に添加し、内容物を均一に混合し、「ACRYSOL ASE-60」、2-(ジメチルアミノ)エタノール及び脱イオン水により、pH、固形分濃度及び粘度を調整して、8.0のpHと、45%の固形分濃度と、60秒の粘度(フォードカップNo.4,20℃)とを有する水性着色塗料(Y2-1)を得た。
組成を、下記表2に示されるように変更した以外は、製造例47と同様にして、水性着色塗料(Y2-2)を得た。
なお、表2中の数字は、全て固形分の量を意味する。
脱脂処理をしたポリプロピレン板(PP板)を、製造例17で得られたプライマー塗料(X-1)で、硬化膜厚が15μmとなるようにエアスプレー塗装し、PP板の上に未硬化のプライマー塗膜を形成した。未硬化のプライマー塗膜を有するPP板を、3分間静置した後、60℃で3分間プレヒートした。次いで、未硬化のプライマー塗膜を有するPP板を、製造例27で得られた水性着色塗料(Y1-1)で、硬化膜厚が15μmとなるように静電式回転霧化塗装機を用いて塗装し、その上に未硬化のベースコート塗膜を形成した。
下記表3又は表4に示されるように、水性着色塗料(Y1-1)を、水性着色塗料(Y1-2)~水性着色塗料(Y1-20)のいずれかに変更した以外は、実施例1と同様にして試験板を作製した。
下記表3に示されるように、クリヤー塗料(Z-1)を、「マジクロンTC-71」(商品名、関西ペイント社製、水酸基含有アクリル樹脂とメラミン樹脂とを含有する熱硬化型クリヤー塗料)(以下、「クリヤー塗料(Z-2)」と称する場合がある)に変更した以外は、実施例1と同様にして試験板を作製した。
下記表3に示されるように、焼付温度を、70℃又は115℃に変更した以外は、実施例1と同様にして、試験板を作製した。
下記表3に示されるように、プライマー塗料(X-1)をプライマー塗料(X-2)に変更した以外は、実施例1と同様にして、試験板を作成した。
脱脂処理をしたポリプロピレン板(PP板)を、製造例17で得られたプライマー塗料(X-1)で、硬化膜厚が20μmとなるようにエアスプレー塗装し、PP板の上に未硬化のプライマー塗膜を形成した。未硬化のプライマー塗膜を有するPP板を、3分間静置した後、60℃で3分間プレヒートした。次いで、未硬化のプライマー塗膜を有するPP板を、製造例47で得られた水性着色塗料(Y2-1)で、硬化膜厚が35μmとなるように静電式回転霧化塗装機を用いて塗装し、その上に未硬化の上塗り塗膜を形成した。未硬化の上塗り塗膜を有するPP板を、3分間静置し、60℃で3分間プレヒートし、そして80℃で30分間加熱して、未硬化のプライマー塗膜と、未硬化の上塗り塗膜とを硬化させ、試験塗板を作製した。
下記表4に示されるように、水性着色塗料(Y2-1)を、水性着色塗料(Y2-2)に変更した以外は、実施例20と同様にして、試験板を作製した。
リン酸亜鉛処理された冷延鋼板を、熱硬化性エポキシ樹脂系カチオン電着塗料(商品名「エレクロンGT-10」、関西ペイント社製)で、硬化膜厚が20μmとなるように電着塗装し、次いで、電着塗膜を有する冷延鋼板を、170℃で30分加熱して硬化させた。電着塗膜を有する冷延鋼板を、プライマー塗料(商品名「TP-65-5」、関西ペイント社製、ポリエステル樹脂・アミノ樹脂系有機溶剤型塗料組成物)で、硬化膜厚が20μmになるように静電式回転霧化塗装機を用いて塗装し、その上に未硬化のプライマー塗膜を形成した。
下記表4に示されるように、水性着色塗料(Y1-1)を、水性着色塗料(Y1-16)に変更した以外は実施例21と同様にして、試験板を作製した。
リン酸亜鉛処理された冷延鋼板を、熱硬化性エポキシ樹脂系カチオン電着塗料組成物(商品名「エレクロンGT-10」、関西ペイント社製)で、硬化膜厚が20μmとなるように電着塗装し、次いで、電着塗膜を有する冷延鋼板を、170℃で30分加熱して硬化させた。電着塗膜を有する冷延鋼板を、プライマー塗料(商品名「TP-65-5」、関西ペイント社製)で、硬化膜厚が20μmになるように静電式回転霧化塗装機を用いて塗装し、その上に未硬化のプライマー塗膜を形成した。
下記表4に示されるように、水性着色塗料(Y2-1)を、水性着色塗料(Y2-2)に変更した以外は実施例22と同様にして、試験板を作製した。
リン酸亜鉛処理された冷延鋼板を、熱硬化性エポキシ樹脂系カチオン電着塗料組成物(商品名「エレクロンGT-10」、関西ペイント社製)で、硬化膜厚が20μmとなるように電着塗装し、次いで、電着塗膜を有する冷延鋼板を、170℃で30分加熱して硬化させた。次いで、電着塗膜を有する冷延鋼板を、製造例27で得られた水性着色塗料(Y1-1)で、硬化膜厚が20μmとなるように静電式回転霧化塗装機を用いて塗装し、その上に未硬化のベースコート塗膜を形成した。
下記表4に示されるように、水性着色塗料(Y1-1)を、水性着色塗料(Y1-16)に変更した以外は実施例23と同様にして、試験板を作製した。
実施例1~23及び比較例1~9で得られた各試験板を、下記の試験方法に従って評価した。結果を、併せて表3及び表4に示す。
平滑性:
各試験板を、「Wave Scan DOI」(商品名、BYK Gardner社製)でスキャンし、測定されるWc値で評価した。なお、Wc値は、その値が小さいほど塗面の平滑性が高いことを意味する。
各試験板を、「Wave Scan DOI」(商品名、BYK Gardner社製)ですキャンし、測定されるWa値で評価した。なお、Wa値は、その値が小さいほど塗面の鮮映性が高いことを意味する。
各試験板を、40℃の温水に240時間浸漬し、引き上げ、20℃で12時間乾燥した後、各試験板の複層塗膜を、カッターで素地に達するように格子状に切り込み、2mm×2mmのサイズのゴバン目を100個作った。続いて、その表面にセロハンテープを貼り付け、20℃においてセロハンテープを急激に剥離した後のゴバン目塗膜の残存状態を調べ、以下の基準に従って評価した。
○:ゴバン目塗膜が100個残存するが、カッターの切り込みの縁において塗膜の縁が欠けている
△:ゴバン目塗膜が90~99個残存する
×:ゴバン目塗膜の残存数が89個以下である
40℃で1ヶ月貯蔵した各水性着色塗料(Y)を用いて、複層塗膜を有する各試験板を作製した。各試験板を、40℃の温水に240時間浸漬し、引き上げ、そして20℃で12時間乾燥した後、各試験板の複層塗膜を、カッターで素地に達するように格子状に切り込み、2mm×2mmサイズのゴバン目を100個作った。その表面にセロハンテープを貼り付け、20℃においてセロハンテープを急激に剥離した後のゴバン目塗膜の残存状態を調べ、下記基準に従って評価した。
○:ゴバン目塗膜が100個残存するが、カッターの切り込みの縁において塗膜の縁が欠けている
△:ゴバン目塗膜が90~99個残存する
×:ゴバン目塗膜の残存数が89個以下である
[J1]
下記の工程1-1~1-4、
工程1-1:被塗物を、プライマー塗料(X)で塗装し、上記被塗物の上に未硬化のプライマー塗膜を形成する工程、
工程1-2:上記未硬化のプライマー塗膜を有する被塗物を、ベースコート用の水性着色塗料(Y1)で塗装して、その上に未硬化のベースコート塗膜を形成する工程、
工程1-3:上記未硬化のプライマー塗膜と、上記未硬化のベースコート塗膜とを有する被塗物を、クリヤー塗料(Z)で塗装し、その上に未硬化のクリヤー塗膜を形成する工程、そして
工程1-4:上記未硬化のプライマー塗膜、上記未硬化のベースコート塗膜、及び上記未硬化のクリヤー塗膜を加熱し、硬化させる工程、
を含む複層塗膜形成方法であって、
水性着色塗料(Y1)が、水酸基含有樹脂(A)、並びに下記一般式(I):
で示されるブロックイソシアネート基、下記一般式(II):
で示されるブロックイソシアネート基、及び下記一般式(III):
で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物(B)を含有する、
ことを特徴とする、上記複層塗膜形成方法。
下記の工程2-1、2-2及び2-3、
工程2-1:被塗物を、プライマー塗料(X)で塗装し、上記被塗物の上に未硬化のプライマー塗膜を形成する工程、
工程2-2:上記未硬化のプライマー塗膜を有する被塗物を、上塗り塗膜用の水性着色塗料(Y2)で塗装し、その上に未硬化の上塗り塗膜を形成する工程、そして
工程2-3:上記未硬化のプライマー塗膜、及び上記未硬化の上塗り塗膜を加熱し、硬化させる工程、
を含む複層塗膜形成方法であって、
水性着色塗料(Y2)が、水酸基含有樹脂(A)、並びに下記一般式(I):
で示されるブロックイソシアネート基、下記一般式(II):
で示されるブロックイソシアネート基、及び下記一般式(III):
で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物(B)を含有する、
ことを特徴とする、上記複層塗膜形成方法。
下記の工程3-1、3-2及び3-3、
工程3-1:被塗物を、ベースコート用の水性着色塗料(Y1)で塗装し、上記被塗物の上に未硬化のベースコート塗膜を形成する工程、
工程3-2:上記未硬化のベースコート塗膜を有する被塗物を、クリヤー塗料(Z)で塗装し、その上にクリヤー塗膜を形成する工程、そして
工程3-3:上記未硬化のベースコート塗膜、及び上記未硬化のクリヤー塗膜を加熱し、硬化させる工程
を含む複層塗膜形成方法であって、
水性着色塗料(Y1)が、水酸基含有樹脂(A)、並びに下記一般式(I):
で示されるブロックイソシアネート基、下記一般式(II):
で示されるブロックイソシアネート基、及び下記一般式(III):
で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物(B)を含有する、
ことを特徴とする、上記複層塗膜形成方法。
一般式(I)において、R1がイソプロピル基である、J1~J3のいずれか一項に記載の方法。
[J5]
一般式(III)において、R6がイソプロピル基である、J1~J4のいずれか一項に記載の方法。
ブロックポリイソシアネート化合物(B)が、下記一般式(IV):
で示されるブロックイソシアネート基を有するブロックポリイソシアネート化合物前駆体(b31)と、下記一般式(VI):
で示される2級アルコール(b4)とを反応させることにより得られた、J1~J5のいずれか一項に記載の方法。
ブロックポリイソシアネート化合物(B)が、下記一般式(V):
で示されるブロックイソシアネート基を有するブロックポリイソシアネート化合物前駆体(b32)と、2級アルコール(b4)とを反応させることにより得られた、J1~J6のいずれか一項に記載の方法。
ブロックポリイソシアネート化合物(B)が、親水基を有するブロックポリイソシアネート化合物(B’)である、J1~J7のいずれか一項に記載の複層塗膜形成方法。
水酸基含有樹脂(A)が、水酸基含有アクリル樹脂水分散液(A11)を含有する、J1~J8のいずれか一項に記載の方法。
水性着色塗料(Y1)又は水性着色塗料(Y2)が、水酸基含有樹脂(A)及びブロックポリイソシアネート化合物(B)を、水酸基含有樹脂(A)及びブロックポリイソシアネート化合物(B)の固形分計100質量部を基準として、それぞれ、10~95質量部及び5~90質量部含有する、J1~J9のいずれか一項に記載の方法。
水性着色塗料(Y1)又は水性着色塗料(Y2)が、メラミン樹脂(C)をさらに含有し、水性着色塗料(Y1)又は水性着色塗料(Y2)が、水酸基含有樹脂(A)、ブロックポリイソシアネート化合物(B)及びメラミン樹脂(C)を、水酸基含有樹脂(A)、ブロックポリイソシアネート化合物(B)、及びメラミン樹脂(C)の固形分計100質量部を基準として、それぞれ、10~90質量部、5~85質量部及び5~40質量部含有する、J1~J10のいずれか一項に記載の方法。
クリヤー塗料(Z)が、ブロック化されていないイソシアネート基を有するポリイソシアネート化合物を含有する、J1~J11のいずれか一項に記載の方法。
硬化させる工程を、70℃以上且つ120℃未満の温度で実施する、J1~J12のいずれか一項に記載の方法。
[J14]
J1~J13のいずれか一項に記載の方法により形成された複層塗膜を有する塗装物品。
Claims (14)
- 下記の工程1-1~1-4、
工程1-1:被塗物を、プライマー塗料(X)で塗装し、前記被塗物の上に未硬化のプライマー塗膜を形成する工程、
工程1-2:前記未硬化のプライマー塗膜を有する被塗物を、ベースコート用の水性着色塗料(Y1)で塗装して、その上に未硬化のベースコート塗膜を形成する工程、
工程1-3:前記未硬化のプライマー塗膜と、前記未硬化のベースコート塗膜とを有する被塗物を、クリヤー塗料(Z)で塗装し、その上に未硬化のクリヤー塗膜を形成する工程、そして
工程1-4:前記未硬化のプライマー塗膜、前記未硬化のベースコート塗膜、及び前記未硬化のクリヤー塗膜を加熱し、硬化させる工程、
を含む複層塗膜形成方法であって、
水性着色塗料(Y1)が、水酸基含有樹脂(A)、並びに下記一般式(I):
で示されるブロックイソシアネート基、下記一般式(II):
で示されるブロックイソシアネート基、及び下記一般式(III):
で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物(B)を含有する、
ことを特徴とする、前記複層塗膜形成方法。 - 下記の工程2-1、2-2及び2-3、
工程2-1:被塗物を、プライマー塗料(X)で塗装し、前記被塗物の上に未硬化のプライマー塗膜を形成する工程、
工程2-2:前記未硬化のプライマー塗膜を有する被塗物を、上塗り塗膜用の水性着色塗料(Y2)で塗装し、その上に未硬化の上塗り塗膜を形成する工程、そして
工程2-3:前記未硬化のプライマー塗膜、及び前記未硬化の上塗り塗膜を加熱し、硬化させる工程、
を含む複層塗膜形成方法であって、
水性着色塗料(Y2)が、水酸基含有樹脂(A)、並びに下記一般式(I):
で示されるブロックイソシアネート基、下記一般式(II):
で示されるブロックイソシアネート基、及び下記一般式(III):
で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物(B)を含有する、
ことを特徴とする、前記複層塗膜形成方法。 - 下記の工程3-1、3-2及び3-3、
工程3-1:被塗物を、ベースコート用の水性着色塗料(Y1)で塗装し、前記被塗物の上に未硬化のベースコート塗膜を形成する工程、
工程3-2:前記未硬化のベースコート塗膜を有する被塗物を、クリヤー塗料(Z)で塗装し、その上にクリヤー塗膜を形成する工程、そして
工程3-3:前記未硬化のベースコート塗膜、及び前記未硬化のクリヤー塗膜を加熱し、硬化させる工程
を含む複層塗膜形成方法であって、
水性着色塗料(Y1)が、水酸基含有樹脂(A)、並びに下記一般式(I):
で示されるブロックイソシアネート基、下記一般式(II):
で示されるブロックイソシアネート基、及び下記一般式(III):
で示されるブロックイソシアネート基からなる群から選択される少なくとも1種のブロックイソシアネート基を有するブロックポリイソシアネート化合物(B)を含有する、
ことを特徴とする、前記複層塗膜形成方法。 - 一般式(I)において、R1がイソプロピル基である、請求項1~3のいずれか一項に記載の方法。
- 一般式(III)において、R6がイソプロピル基である、請求項1~4のいずれか一項に記載の方法。
- ブロックポリイソシアネート化合物(B)が、親水基を有するブロックポリイソシアネート化合物(B’)である、請求項1~7のいずれか一項に記載の複層塗膜形成方法。
- 水酸基含有樹脂(A)が、水酸基含有アクリル樹脂水分散液(A11)を含有する、請求項1~8のいずれか一項に記載の方法。
- 水性着色塗料(Y1)又は水性着色塗料(Y2)が、水酸基含有樹脂(A)及びブロックポリイソシアネート化合物(B)を、水酸基含有樹脂(A)及びブロックポリイソシアネート化合物(B)の固形分計100質量部を基準として、それぞれ、10~95質量部及び5~90質量部含有する、請求項1~9のいずれか一項に記載の方法。
- 水性着色塗料(Y1)又は水性着色塗料(Y2)が、メラミン樹脂(C)をさらに含有し、水性着色塗料(Y1)又は水性着色塗料(Y2)が、水酸基含有樹脂(A)、ブロックポリイソシアネート化合物(B)及びメラミン樹脂(C)を、水酸基含有樹脂(A)、ブロックポリイソシアネート化合物(B)、及びメラミン樹脂(C)の固形分計100質量部を基準として、それぞれ、10~90質量部、5~85質量部及び5~40質量部含有する、請求項1~10のいずれか一項に記載の方法。
- クリヤー塗料(Z)が、ブロック化されていないイソシアネート基を有するポリイソシアネート化合物を含有する、請求項1~11のいずれか一項に記載の方法。
- 硬化させる工程を、70℃以上且つ120℃未満の温度で実施する、請求項1~12のいずれか一項に記載の方法。
- 請求項1~13のいずれか一項に記載の方法により形成された複層塗膜を有する塗装物品。
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