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WO2025142013A1 - Composition aqueuse de revêtement à composants multiples et procédé de production d'article revêtu - Google Patents

Composition aqueuse de revêtement à composants multiples et procédé de production d'article revêtu Download PDF

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Publication number
WO2025142013A1
WO2025142013A1 PCT/JP2024/035495 JP2024035495W WO2025142013A1 WO 2025142013 A1 WO2025142013 A1 WO 2025142013A1 JP 2024035495 W JP2024035495 W JP 2024035495W WO 2025142013 A1 WO2025142013 A1 WO 2025142013A1
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Prior art keywords
mass
coating composition
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coating film
segment
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Pending
Application number
PCT/JP2024/035495
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English (en)
Japanese (ja)
Inventor
和真 今野
沙織 土屋
弘喜 安東
美登 久司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Paint Automotive Coatings Co Ltd
Original Assignee
Nippon Paint Automotive Coatings Co Ltd
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Publication of WO2025142013A1 publication Critical patent/WO2025142013A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols

Definitions

  • the present invention relates to an aqueous multi-component paint composition and a method for producing a coated article.
  • Patent Document 1 discloses an aqueous multi-liquid paint composition that contains a base agent (I) containing a hydroxyl-containing acrylic resin and a curing agent (II) containing an anionic hydrophilic group-containing polyisocyanate compound and/or a nonionic hydrophilic group-containing polyisocyanate compound.
  • the object of the present invention is to provide a water-based multi-component coating composition that can be cured at low temperatures, produces a coating film with excellent chipping resistance, and also has excellent re-solubility of the thin film that is generated from the base agent.
  • the polyurethane resin (B) is obtained by chain-extending a terminal NCO group-containing urethane prepolymer, which is a reaction product of a polyisocyanate compound (b1) and a polyol (b2), with a polyamine compound (b3),
  • the copolymer (C) further has a third segment (c3) derived from a polymerizable unsaturated monomer other than the nitrogen-containing polymerizable unsaturated monomer and the polymerizable unsaturated monomer having a polyoxyalkylene chain,
  • the mass proportion of the first segment (c1) is 5 mass% or more and 30 mass% or less
  • the mass ratio of the second segment (c2) is 20 mass% or more and 80 mass% or less
  • the water-based multi-component coating composition according to any one of the above [1] to [8], wherein the mass proportion of the third segment (c3) is 10 mass% or more and 60 mass% or less.
  • the polyisocyanate compound (D) comprises at least one selected from the group consisting of aliphatic diisocyanates, aliphatic triisocyanates, alicyclic diisocyanates, alicyclic triisocyanates, aromatic diisocyanates, aromatic triisocyanates, and derivatives thereof.
  • the aqueous multi-component coating composition according to any one of [1] to [11] above.
  • the content of the color pigment (E) is 1 part by mass or more and 150 parts by mass or less per 100 parts by mass of the total solid content of the hydroxyl group-containing acrylic resin (A), the polyurethane resin (B), the copolymer (C) and the polyisocyanate compound (D).
  • the aqueous multi-component coating composition according to any one of [1] to [12] above.
  • the hydroxyl value (OHV) and acid value (AV) are determined based on the solid mass.
  • the hydroxyl value and acid value can be measured by the known method described in JIS K 0070:1992.
  • the hydroxyl value and acid value may be calculated from the amount of unsaturated monomer in the raw material monomer of the resin (e.g., hydroxyl-containing acrylic resin (A)).
  • (Meth)acrylic acid includes both methacrylic acid and acrylic acid.
  • (Meth)acrylate includes both methacrylate and acrylate.
  • the aqueous coating composition is a multi-liquid type containing a first liquid and a second liquid.
  • the aqueous coating composition may further contain a third liquid containing other components.
  • the aqueous coating composition is prepared using a method commonly used by those skilled in the art.
  • the aqueous coating composition can be prepared by mixing the first liquid, the second liquid, and further the third liquid. Examples of mixing methods include a kneading and mixing method using a kneader or roll, and a dispersion and mixing method using a sand grind mill or disperser.
  • Aqueous paint compositions contain water as a solvent.
  • the proportion of water in the solvent may be 50% by mass or more, 70% by mass or more, or 100% by mass.
  • the above resins are water-based.
  • Water-based resins are generally classified into water-soluble and water-dispersed resins. Water-dispersed resins are further classified into dispersion type (generally called colloidal dispersion type) and emulsion type.
  • Water-soluble water-based resins are typically obtained by dissolving resins synthesized in an organic solvent in water with a neutralizing agent.
  • Colloidal dispersion type water-based resins are typically obtained by semi-dissolving resins synthesized in an organic solvent in water with a neutralizing agent.
  • Emulsion type water-based resins are typically produced by emulsion polymerization or by mechanical forced emulsification.
  • the hydroxyl-containing acrylic resin (A) is a resin (film-forming component) that is the base of the coating film.
  • the hydroxyl-containing acrylic resin (A) reacts with the polyisocyanate compound (D) to form a crosslinked structure.
  • the hydroxyl-containing acrylic resin (A) provides a coating film with sufficient hardness. The hardness of the coating film can be evaluated by the breaking strength.
  • the hydroxyl-containing acrylic resin (A) has multiple acryloyl groups and one or more (typically two or more) hydroxyl groups in one molecule.
  • the hydroxyl value (OHV) of the hydroxyl-containing acrylic resin (A) is, for example, 20 mgKOH/g or more and 180 mgKOH/g or less.
  • the hydroxyl value of the hydroxyl-containing acrylic resin (A) is 20 mgKOH/g or more, the breaking strength of the coating film is likely to be high.
  • the hydroxyl value of the hydroxyl-containing acrylic resin (A) is 180 mgKOH/g or less, the hydrophilization of the coating film is suppressed, and the water resistance is likely to be improved.
  • the hydroxyl value of the hydroxyl-containing acrylic resin (A) may be 30 mgKOH/g or more, or may be 50 mgKOH/g or more.
  • the hydroxyl value of the hydroxyl-containing acrylic resin (A) may be 150 mgKOH/g or less, or may be 140 mgKOH/g or less.
  • the glass transition temperature (Tg) of the hydroxyl-containing acrylic resin (A) is, for example, 15°C or higher and 100°C or lower. If the Tg of the hydroxyl-containing acrylic resin (A) is 15°C or higher, the breaking strength and hardness of the resulting coating film are likely to be improved. If the Tg of the hydroxyl-containing acrylic resin (A) is 100°C or lower, the quick-drying property of the aqueous coating composition is likely to be improved.
  • the Tg of the hydroxyl-containing acrylic resin (A) may be 18°C or higher, or 20°C or higher.
  • the Tg of the hydroxyl-containing acrylic resin (A) may be 90°C or lower, 80°C or lower, or 70°C or lower.
  • SP solubility parameter
  • Examples of ⁇ , ⁇ -ethylenically unsaturated monomers having a hydroxyl group include hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, allyl alcohol, methallyl alcohol, and adducts of these with ⁇ -caprolactone.
  • Polyurethane resin (B) is also a coating film forming component. Polyurethane resin (B) increases the elasticity of the coating film and improves chipping resistance. The elasticity of the coating film can be evaluated not only by chipping resistance but also by elastic modulus and breaking elongation.
  • the polyurethane resin (B) may have an acid value of 5 mgKOH/g or more and 70 mgKOH/g or less. This makes it easier to improve the hardness of the resulting coating film and ensure the water resistance of the resulting coating film.
  • the acid value of the polyurethane resin (B) may be 8 mgKOH/g or more, or 10 mgKOH/g or more.
  • the acid value of the polyurethane resin (B) may be 60 mgKOH/g or less, 50 mgKOH/g or less, or 40 mgKOH/g or less.
  • the polyurethane resin (B) may be dissolved. That is, the polyurethane resin (B) may be a water-soluble polyurethane resin. In the first liquid, the polyurethane resin (B) may be in the form of a dispersion.
  • the polyurethane resin (B) is obtained, for example, by chain-extending a urethane prepolymer containing terminal NCO groups, which is a reaction product of a polyisocyanate compound (b1) and a polyol (b2), with a polyamine compound (b3).
  • This polyurethane resin (B) has the advantage that it can have a high molecular weight.
  • polyisocyanate compound (b1) examples include aromatic polyisocyanates, aliphatic polyisocyanates, alicyclic polyisocyanates, and araliphatic polyisocyanates.
  • the polyisocyanate compound (b1) may contain at least one selected from the group consisting of aromatic polyisocyanates, aliphatic polyisocyanates, alicyclic polyisocyanates, araliphatic polyisocyanates, and derivatives thereof (e.g., hydrogenated products, polymers). This tends to increase the flexibility of the resulting polyurethane resin (B).
  • Aromatic polyisocyanates have two or more isocyanate groups bonded to carbon atoms that make up an aromatic ring.
  • aromatic polyisocyanates include aromatic diisocyanates such as m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4'-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, 2,4'- or 4,4'-diphenylmethane diisocyanate (MDI), or mixtures thereof, 2,4- or 2,6-tolylene diisocyanate, or mixtures thereof, 4,4'-toluidine diisocyanate, and 4,4'-diphenylether diisocyanate; aromatic triisocyanates such as triphenylmethane-4,4',4''-triisocyanate, 1,3,5-triisocyanatobenzene, and 2,4,6-triisocyanatotoluene; and aromatic tetraisocyanates such as 4,
  • Aliphatic polyisocyanates do not have aromatic rings and have two or more isocyanate groups bonded to carbon atoms constituting a linear or branched aliphatic hydrocarbon group.
  • aliphatic polyisocyanates include ethylene diisocyanate, trimethylene diisocyanate, 1,2-propylene diisocyanate, butylene diisocyanate (tetramethylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate), 1,5-pentamethylene diisocyanate (PDI), 1,6-hexamethylene diisocyanate (HDI), 2,4,4- or 2,2,4-trimethylhexamethylene diisocyanate, 1,2-dimethylphenyl diisocyanate, 1,3-dimethylphenyl diisocyanate, 1,5-dimethylphenyl diisocyanate, 1,6 ...5-dimethylphenyl diisocyanate,
  • Aromatic aliphatic polyisocyanates have an aromatic ring and two or more isocyanate groups bonded to carbon atoms constituting an aliphatic hydrocarbon group.
  • aromatic aliphatic polyisocyanates include aromatic aliphatic diisocyanates such as 1,3- or 1,4-xylylene diisocyanate, or mixtures thereof, ⁇ , ⁇ '-diisocyanato-1,4-diethylbenzene, 1,3- or 1,4-bis(1-isocyanato-1-methylethyl)benzene (common name: tetramethylxylylene diisocyanate), or mixtures thereof; and aromatic aliphatic triisocyanates such as 1,3,5-triisocyanatomethylbenzene. These may be used alone or in combination of two or more.
  • the polyamine compound (b3) has two or more amino groups in the molecule.
  • the polyamine compound (b3) functions as a chain extender.
  • polyamine compound (b3) examples include ethylenediamine, tetramethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, piperazine, hydrazine, tolylenediamine, xylylenediamine, and isophoronediamine. These may be used alone or in combination of two or more.
  • Representative examples include monoisocyanate compounds. Examples of monoisocyanate compounds include methyl isocyanate, ethyl isocyanate, propyl isocyanate, butyl isocyanate, lauryl isocyanate, cyclohexyl isocyanate, phenyl isocyanate, and tolylene isocyanate. These may be used alone or in combination of two or more.
  • the polyurethane resin (B) can be obtained, for example, by reacting a polyisocyanate compound (b1) with a part of a polyol (b2) to obtain a terminal NCO group-containing urethane prepolymer, and then reacting this prepolymer with a polyamine compound (b3) and the remaining part of the polyol (b2).
  • the other component (b4) may be added at any stage.
  • the reaction temperature may be 40°C or higher and 140°C or lower, or 60°C or higher and 120°C or lower.
  • Tin-based catalysts such as dibutyltin laurate and tin octoate, which are used in normal urethane reactions, or amine-based catalysts such as triethylenediamine may be used.
  • the reaction may be carried out in an organic solvent inert to isocyanates (e.g., acetone, toluene, ethyl acetate, dimethylformamide, methyl ethyl ketone), and an organic solvent may be added during or after the reaction.
  • organic solvent inert to isocyanates e.g., acetone, toluene, ethyl acetate, dimethylformamide, methyl ethyl ketone
  • the polyisocyanate compound (b1) and the polyol (b2) are each used in an amount such that the ratio of isocyanate groups to hydroxyl groups (NCO/OH) is, for example, 1.03 to 1.99.
  • copolymer (C) improves the resolubility of the thin film containing the polyurethane resin (B).
  • the copolymer (C) may be dissolved. That is, the copolymer (C) may be water-soluble. In the first liquid, the copolymer (C) may be in the form of a dispersion. The copolymer (C) may be water-soluble.
  • the content of copolymer (C) may be 20 parts by mass or more and 300 parts by mass or less per 100 parts by mass of the solid content of polyurethane resin (B). This may further improve resolubility.
  • the content of copolymer (C) may be 23 parts by mass or more, or may be 25 parts by mass or more.
  • the content of copolymer (C) may be 200 parts by mass or less, or may be 100 parts by mass or less.
  • the weight average molecular weight of copolymer (C) may be 10,000 or more and 40,000 or less.
  • the weight average molecular weight of copolymer (C) may be 15,000 or more and may be 20,000 or more.
  • the weight average molecular weight of copolymer (C) may be 38,000 or less and may be 35,000 or less.
  • the acid value of the copolymer (C) may be less than 5 mgKOH/g, may be 2 mgKOH/g or less, or may be 0 mgKOH/g.
  • the hydroxyl value of the copolymer (C) may be 20 mgKOH/g or more and 180 mgKOH/g or less. This makes it easier to increase the breaking strength of the coating film and to inhibit the coating film from becoming hydrophilic.
  • the hydroxyl value of the copolymer (C) may be 30 mgKOH/g or more and may be 50 mgKOH/g or more.
  • the hydroxyl value of the copolymer (C) may be 150 mgKOH/g or less and may be 140 mgKOH/g or less.
  • the amine value of the copolymer (C) may be 3 mgKOH/g or more and 100 mgKOH/g or less. This can improve the surface smoothness of the coating film.
  • the amine value of the copolymer (C) may be 20 mgKOH/g or more, or may be 30 mgKOH/g or more.
  • the amine value of the copolymer (C) may be 90 mgKOH/g or less, or may be 80 mgKOH/g or less.
  • the copolymer (C) has a first segment (c1) derived from a nitrogen-containing polymerizable unsaturated monomer (hereinafter sometimes referred to as a "nitrogen-containing monomer”) having a tertiary amino group and/or a nitrogen-containing heterocyclic group (hereinafter sometimes referred to as a "nitrogen-containing group”), and a second segment (c2) derived from a polymerizable unsaturated monomer having a polyoxyalkylene chain (hereinafter sometimes referred to as a "hydrophilic monomer").
  • a nitrogen-containing polymerizable unsaturated monomer hereinafter sometimes referred to as a "nitrogen-containing monomer”
  • a second segment (c2) derived from a polymerizable unsaturated monomer having a polyoxyalkylene chain
  • the nitrogen-containing group and the polyoxyalkylene chain may both be arranged as side chains, or may form part of the main chain.
  • the nitrogen-containing group and the polyoxyalkylene chain may both be arranged as side chains, and the main chain of the copolymer (C) may be formed of carbon-carbon bonds.
  • the nitrogen-containing polymerizable unsaturated monomer may have a tertiary amino group.
  • the copolymer (C) may have an amine value of 3 mgKOH/g or more and 100 mgKOH/g or less, and a hydroxyl value of 20 mgKOH/g or more and 180 mgKOH/g or less. This can further improve the surface smoothness of the coating film.
  • the copolymer (C) may have a first segment (c1) derived from a nitrogen-containing monomer having a tertiary amino group.
  • tertiary amino group-containing monomers include N,N-dialkylaminoalkyl (meth)acrylates such as N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N,N-dimethylaminopropyl (meth)acrylate, N,N-di-t-butylaminoethyl (meth)acrylate, and N,N-dimethylaminobutyl (meth)acrylate; and N,N-dialkylaminoalkyl (meth)acrylamides such as N,N-dimethylaminoethyl (meth)acrylamide, N,N-diethylaminoethyl (meth)acrylamide, and N,N-dimethylaminopropyl (meth)acrylamide. These may be used alone or in combination of two or more.
  • the clear coating film is formed by a clear coating composition.
  • the clear coating composition will be described later.
  • the dry film thickness of the clear coating film is, for example, 10 ⁇ m or more and 80 ⁇ m or less.
  • the dry film thickness of the clear coating film may be 20 ⁇ m or more.
  • the dry film thickness of the clear coating film may be 60 ⁇ m or less.
  • pre-drying also called pre-heating
  • pre-heating may be performed before applying the second paint composition. This prevents the solvent contained in the aqueous paint composition from bumping during the curing process, making it easier to prevent popping. Furthermore, pre-drying prevents the uncured first coating film and the second paint composition from mixing, making it difficult for a mixed layer to form. This can further improve the smoothness of the resulting coated article.
  • pre-drying examples include leaving the material at a temperature of 20°C to 25°C for 5 to 15 minutes, or heating the material at a temperature of 50°C to 80°C for 30 seconds to 10 minutes.
  • Step of forming an uncured second coating film A second coating composition is applied on the uncured first coating film to form an uncured second coating film. Two or more layers of uncured second coating films can be formed by applying the same or different second coating compositions two or more times. An interval of several minutes may be provided between the application of the nth second coating composition and the application of the n+1th second coating composition.
  • the coating method may be, for example, the same method as the coating method for the aqueous coating composition. After coating the second coating composition, preliminary drying may be performed in the same manner as described above.
  • the second coating composition may be water-based or solvent-based.
  • the second coating composition may be water-based.
  • the water-based second coating composition contains, for example, an acrylic resin emulsion, a water-soluble acrylic resin, a curing agent (typically, a melamine resin), and a polyether polyol resin.
  • the second coating composition may further contain the above-mentioned various pigments, luster pigments, and various additives.
  • each uncured coating film is cured.
  • Each coating film can be cured by heating.
  • the first coating film, the second coating film, and the clear coating film are cured at the same time.
  • the heating temperature is, for example, 70°C or higher and 100°C or lower.
  • the heating temperature may be 75°C or higher, or 80°C or higher.
  • the heating temperature may be 95°C or lower, or 90°C or lower.
  • the heating time refers to the time during which the temperature inside the heating device reaches the target temperature and the workpiece is maintained at the target temperature, and does not take into account the time until the target temperature is reached. Examples of heating devices include drying furnaces that use heat sources such as hot air, electricity, gas, and infrared rays.
  • the heating time may be set appropriately depending on the heating temperature.
  • the heating time may be, for example, 10 minutes or longer and 60 minutes or shorter, and may be 15 minutes or longer and 45 minutes or shorter.
  • the acid value and hydroxyl value were calculated based on the amount of each unsaturated monomer used and their solid acid value and solid hydroxyl value.
  • Production Example 2-1 Production of Polyurethane Resin (B-1)
  • a simple pressurized reaction apparatus equipped with a stirrer and a heater was charged with 36.1 parts by weight of polyisocyanate compound (b1-1), 100.0 parts by weight of polyol (b2-1), 1.6 parts by weight of polyol (b2-7), 4.6 parts by weight of polyol (b2-10), 70.0 parts by weight of organic solvent (THF, tetrahydrofuran), and 0.06 parts by weight of catalyst (Neostan U-600, bismuth tris (2-ethylhexanoate, manufactured by Nitto Kasei Co., Ltd.)), and the mixture was stirred at 85° C. for 10 hours to carry out a urethanization reaction, producing a THF solution of a urethane prepolymer.
  • THF tetrahydrofuran
  • the resulting THF solution of urethane prepolymer was placed in a simple pressurized reaction apparatus equipped with a stirrer and a heating reaction device, and 3.5 parts by weight of a neutralizing agent (triethylamine) was added while stirring at 50°C. After homogenizing for 30 minutes at 60 rpm, the temperature was kept at 50°C, and 220 parts by weight of ion-exchanged water was gradually added while stirring at 500 rpm to emulsify. Next, 5.2 parts by weight of a 10% water dilution of polyamine compound (b3-1) was added, and THF was distilled off under reduced pressure at 65°C for 12 hours to obtain a dispersion of polyurethane resin (B-1).
  • a neutralizing agent triethylamine
  • pigment dispersion paste 19.2 parts of Typec CR-97 (titanium dioxide, manufactured by Ishihara Sangyo Kaisha), 4.8 parts of MA-100 (carbon black, manufactured by Mitsubishi Carbon Co., Ltd.), and 16 parts of barium sulfate B-34 (barium sulfate, manufactured by Sakai Chemical Industry Co., Ltd.) were charged into a 1 L stainless steel container and mixed and dispersed at room temperature for 45 minutes using a paint conditioner to obtain a pigment dispersion paste (pigment solid content: 70%).
  • Typec CR-97 titanium dioxide, manufactured by Ishihara Sangyo Kaisha
  • MA-100 carbon black, manufactured by Mitsubishi Carbon Co., Ltd.
  • barium sulfate B-34 barium sulfate, manufactured by Sakai Chemical Industry Co., Ltd.
  • Example 1 (1) Preparation of First Liquid To a 1 L metal container, 98 parts of the above pigment dispersion paste, 30 parts of the hydroxyl group-containing acrylic resin (A-1), 25 parts of the polyurethane resin (B-1), 10 parts of the copolymer (C-1), and an appropriate amount of water were added in this order, and the mixture was thoroughly stirred with a disper to obtain a first liquid.
  • the aqueous coating composition was electrostatically coated on the electrodeposition coating film using a rotary atomizing electrostatic coater. After leaving it for 5 minutes, an aqueous base coating composition (manufactured by Nippon Paint Automotive Coatings, product name: Aqueous Base AR-3020-1 (gray metallic)) was applied using a rotary atomizing electrostatic coater at a room temperature of 23°C and a humidity of 68% so that the dry film thickness was 12 ⁇ m. After setting for 4 minutes, the coating was preheated at 80°C for 5 minutes.
  • a clear coating (manufactured by Nippon Paint Automotive Coatings, product name: Polyurexel O-1200, a two-component acrylic urethane organic solvent-based clear coating containing a polyisocyanate compound) was applied using a rotary atomizing electrostatic coater so that the dry film thickness was 35 ⁇ m. Finally, the coating was heated at 85°C for 20 minutes to obtain a coated article having a multi-layer coating film.
  • the aqueous coating composition of the present invention can be cured at low temperatures, while still providing a coating film with excellent chipping resistance, and the thin film produced from the base agent has excellent resolubility. Therefore, it can be used particularly effectively on substrates that contain both metal and resin parts.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

L'invention concerne une composition aqueuse de revêtement à composants multiples comprenant : un premier liquide comprenant une résine acrylique contenant un groupe hydroxyle (A), une résine de polyuréthane (B), et un copolymère (C) ayant un premier segment (c1) qui est dérivé d'un monomère insaturé polymérisable contenant de l'azote ayant au moins un élément parmi un groupe amino tertiaire et un groupe hétérocyclique contenant de l'azote, et un deuxième segment (c2) qui est dérivé d'un monomère insaturé polymérisable ayant une chaîne polyoxyalkylène ; et un deuxième liquide comprenant un composé polyisocyanate (D).
PCT/JP2024/035495 2023-12-25 2024-10-03 Composition aqueuse de revêtement à composants multiples et procédé de production d'article revêtu Pending WO2025142013A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023218564A JP2025101603A (ja) 2023-12-25 2023-12-25 水性多液型塗料組成物および塗装物品の製造方法
JP2023-218564 2023-12-25

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WO2025142013A1 true WO2025142013A1 (fr) 2025-07-03

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009173861A (ja) * 2007-12-27 2009-08-06 Toyota Motor Corp リコート用水性プライマー及び塗膜形成方法
JP2013221131A (ja) * 2012-04-18 2013-10-28 Kansai Paint Co Ltd 顔料分散用樹脂
JP2014125604A (ja) * 2012-12-27 2014-07-07 Kansai Paint Co Ltd 多成分系の水性塗料組成物
WO2020153057A1 (fr) * 2019-01-21 2020-07-30 関西ペイント株式会社 Procédé de formation d'un film de revêtement multicouche
WO2020203601A1 (fr) * 2019-03-29 2020-10-08 三井化学株式会社 Isocyanate bloqué, procédé de production de film multicouche et film multicouche

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JP2013221131A (ja) * 2012-04-18 2013-10-28 Kansai Paint Co Ltd 顔料分散用樹脂
JP2014125604A (ja) * 2012-12-27 2014-07-07 Kansai Paint Co Ltd 多成分系の水性塗料組成物
WO2020153057A1 (fr) * 2019-01-21 2020-07-30 関西ペイント株式会社 Procédé de formation d'un film de revêtement multicouche
WO2020203601A1 (fr) * 2019-03-29 2020-10-08 三井化学株式会社 Isocyanate bloqué, procédé de production de film multicouche et film multicouche

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