WO2023037688A1 - 塗料組成物 - Google Patents
塗料組成物 Download PDFInfo
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- WO2023037688A1 WO2023037688A1 PCT/JP2022/024201 JP2022024201W WO2023037688A1 WO 2023037688 A1 WO2023037688 A1 WO 2023037688A1 JP 2022024201 W JP2022024201 W JP 2022024201W WO 2023037688 A1 WO2023037688 A1 WO 2023037688A1
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- coating composition
- range
- acid
- polymerizable unsaturated
- coating
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- 229960003351 prussian blue Drugs 0.000 description 1
- 239000013225 prussian blue Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- FYNROBRQIVCIQF-UHFFFAOYSA-N pyrrolo[3,2-b]pyrrole-5,6-dione Chemical compound C1=CN=C2C(=O)C(=O)N=C21 FYNROBRQIVCIQF-UHFFFAOYSA-N 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 238000007717 redox polymerization reaction Methods 0.000 description 1
- 239000004627 regenerated cellulose Substances 0.000 description 1
- XWGJFPHUCFXLBL-UHFFFAOYSA-M rongalite Chemical compound [Na+].OCS([O-])=O XWGJFPHUCFXLBL-UHFFFAOYSA-M 0.000 description 1
- 150000003872 salicylic acid derivatives Chemical class 0.000 description 1
- 235000003441 saturated fatty acids Nutrition 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229940047670 sodium acrylate Drugs 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 229940080237 sodium caseinate Drugs 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 229940035044 sorbitan monolaurate Drugs 0.000 description 1
- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 235000019337 sorbitan trioleate Nutrition 0.000 description 1
- 229960000391 sorbitan trioleate Drugs 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229960002317 succinimide Drugs 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 150000003457 sulfones Chemical class 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- JZFHXRUVMKEOFG-UHFFFAOYSA-N tert-butyl dodecaneperoxoate Chemical compound CCCCCCCCCCCC(=O)OOC(C)(C)C JZFHXRUVMKEOFG-UHFFFAOYSA-N 0.000 description 1
- WMXCDAVJEZZYLT-UHFFFAOYSA-N tert-butylthiol Chemical compound CC(C)(C)S WMXCDAVJEZZYLT-UHFFFAOYSA-N 0.000 description 1
- 150000000000 tetracarboxylic acids Chemical class 0.000 description 1
- TUNFSRHWOTWDNC-HKGQFRNVSA-N tetradecanoic acid Chemical compound CCCCCCCCCCCCC[14C](O)=O TUNFSRHWOTWDNC-HKGQFRNVSA-N 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- RUELTTOHQODFPA-UHFFFAOYSA-N toluene 2,6-diisocyanate Chemical compound CC1=C(N=C=O)C=CC=C1N=C=O RUELTTOHQODFPA-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- DXNCZXXFRKPEPY-UHFFFAOYSA-N tridecanedioic acid Chemical compound OC(=O)CCCCCCCCCCCC(O)=O DXNCZXXFRKPEPY-UHFFFAOYSA-N 0.000 description 1
- 239000013638 trimer Substances 0.000 description 1
- RRHXZLALVWBDKH-UHFFFAOYSA-M trimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]azanium;chloride Chemical compound [Cl-].CC(=C)C(=O)OCC[N+](C)(C)C RRHXZLALVWBDKH-UHFFFAOYSA-M 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
- FUSUHKVFWTUUBE-UHFFFAOYSA-N vinyl methyl ketone Natural products CC(=O)C=C FUSUHKVFWTUUBE-UHFFFAOYSA-N 0.000 description 1
- 125000002256 xylenyl group Chemical class C1(C(C=CC=C1)C)(C)* 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
- 229960000314 zinc acetate Drugs 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
-
- 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
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
- C09D201/02—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C09D201/06—Coating compositions based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
Definitions
- the present invention relates to coating compositions.
- Popping occurs when the solvent in the coating film evaporates rapidly during heat curing.
- water-based paints are more likely to cause popping than solvent-based paints because the main component of the solvent is water and the amount of organic solvents with relatively high boiling points to be used is limited.
- the paint used When the paint is atomized and applied, the paint used generally has a low viscosity when the paint is atomized during spraying, rotary atomization, etc., and smaller paint particles are formed, which causes popping. is known to be suppressed.
- the paint thickens and/or settles during storage, it becomes difficult to paint, so the paint is also required to have storage stability.
- one method for controlling the viscosity is to incorporate an associative viscosity modifier into the paint.
- the associative viscosity modifier generally has a hydrophilic portion and a hydrophobic portion in one molecule. It is a viscosity modifier that forms a network structure by adsorbing to the surface of the pigment and/or resin particles blended therein, or by associating the hydrophobic portions with each other, and exhibits an effective thickening action. .
- the above-mentioned associative viscosity modifier usually forms a network structure through hydrophobic interaction and develops viscosity.
- the hydrophobic interaction and network structure are destroyed, resulting in a decrease in viscosity. Therefore, the water-based paint containing the associative viscosity modifier has viscosity characteristics such that the viscosity decreases as the shear rate increases.
- the water-based base coat paint may generally contain a surfactant in order to disperse the hydrophobic resin component in water. Moreover, when water-soluble resins, additives, or pigment dispersion pastes are contained, the contained hydrophilic organic solvents may be brought into the water-based paint.
- the viscosity due to the associative viscosity modifier is less likely to develop, resulting in reduced storage stability.
- the viscosity of the water-based paint is increased by increasing the content of the associative viscosity modifier in the water-based paint, the viscosity increases when the shear rate is high, and the paint when the paint is atomized. Since the particles become large, there are cases where the anti-popping property is inferior.
- Patent Document 1 describes an aqueous coating composition containing acrylic resin particles (A), a hydroxyl-containing resin (B), a cross-linking agent (C), a viscosity modifier (D) and a pigment (E), wherein the acrylic resin particles (A) has a core-shell structure with a mass ratio of 10/90 to 90/10, the core portion is crosslinked, and the total amount of polymerizable unsaturated monomers constituting the acrylic resin particles (A) is 100.
- the amount of polymerizable unsaturated monomer (a1) having a linear, branched or cyclic saturated or unsaturated hydrocarbon group having 4 or more carbon atoms is 3 to 70 parts by mass, and the hydroxyl group
- the contained resin (B) has a weight average molecular weight of 1,000 or more and less than 100,000
- the viscosity modifier (D) has a weight average molecular weight of 100,000 or more and constitutes Per 100 parts by mass of the total amount of monomers, 5 to 50 parts by mass of a polymerizable unsaturated monomer (d1) having a polyoxyalkylene chain, N-vinyl-2-pyrrolidone, N-substituted (meth)acrylamide, a hydroxyl group-containing polymerizable unsaturated monomer 5 to 90 parts by mass of at least one hydrophilic functional group-containing polymerizable unsaturated monomer (d2) having no polyoxyalkylene chain selected from saturated monomers and acid group-containing polymerizable unsaturated
- An object of the present invention is to provide a coating composition capable of forming a multi-layer coating film with excellent storage stability and excellent resistance to popping.
- the present inventors have made intensive studies to solve the above problems, and found that a coating composition containing a hydroxyl group-containing resin (A), a curing agent (B), and cellulose nanocrystal particles (C), wherein the temperature Viscosity (V 1 ) measured under conditions of 25° C. and shear rate of 1,500 sec ⁇ 1 is within the range of 10 to 70 mPa ⁇ s, and measured under conditions of temperature of 25° C. and shear rate of 0.1 sec ⁇ 1 It has been found that the above problems can be solved by using a coating composition having a viscosity (V 2 ) within the range of 10,000 to 50,000 mPa ⁇ s.
- V 1 hydroxyl group-containing resin
- B curing agent
- C cellulose nanocrystal particles
- ⁇ 2> The coating composition according to ⁇ 1>, wherein the cellulose nanocrystal particles (C) have a sulfonic acid group.
- ⁇ 3> The cellulose nanocrystal particles (C) according to ⁇ 1> or ⁇ 2>, wherein the cellulose nanocrystal particles (C) have a number average diameter within the range of 1 to 5 nm and a specific surface area within the range of 320 to 500 m 2 /g. paint composition.
- ⁇ 4> The coating composition according to any one of ⁇ 1> to ⁇ 3>, wherein the cellulose nanocrystal particles (C) have a number average length in the range of 20 to 500 nm.
- ⁇ 5> The coating composition according to any one of ⁇ 1> to ⁇ 4>, wherein the cellulose nanocrystal particles (C) have a zeta potential in the range of -50 to -1 mV.
- ⁇ 6> The coating composition according to any one of ⁇ 1> to ⁇ 5>, further comprising water.
- ⁇ 7> The coating composition according to ⁇ 6>, wherein the water content is in the range of 30 to 80% by mass based on the total amount of the coating composition.
- the hydroxyl group-containing resin (A) is a polymerizable unsaturated monomer (c) having at least two polymerizable unsaturated groups in one molecule and a polymerizable unsaturated group having one polymerizable unsaturated group in one molecule.
- Step (I-1) A step of applying the base coat paint composition (Y) to an object to be coated to form an uncured base coat film
- Step (I-2) A step of applying the clear coat coating composition (Z) onto the uncured base coat coating to form an uncured clear coat coating
- Step (I-3) The uncured A method for forming a multilayer coating film comprising the step of heating a cured base coat coating film and the uncured clear coat coating film to simultaneously cure both coating films, A method for forming a multilayer coating film, wherein the base coat coating composition (Y) is the coating composition according to any one of ⁇ 1> to ⁇ 9>.
- Step (II-1) A step of applying the colored coating composition (X) to the object to be coated to form an uncured colored coating film
- Step (II-2) A step of applying the base coat paint composition (Y) onto the uncured colored paint film to form an uncured base coat paint film
- Step (II-3) A step of applying the clear coat paint composition (Z) onto the uncured base coat paint film to form an uncured clear coat paint film
- Step (II-4) the above A method for forming a multi-layer coating film comprising a step of heating an uncured colored coating film, the uncured base coat coating film and the uncured clear coat coating film to simultaneously cure them, A method for forming a multilayer coating film, wherein the base coat coating composition (Y) is the coating composition according to any one of ⁇ 1> to ⁇ 9>.
- the present invention it is possible to provide a coating composition capable of forming a multi-layer coating film with excellent storage stability and excellent resistance to popping.
- the coating composition of the present invention is a coating composition containing a hydroxyl group-containing resin (A), a curing agent (B) and cellulose nanocrystal particles (C) under conditions of a temperature of 25° C. and a shear rate of 1,500 sec ⁇ 1.
- the viscosity (V 1 ) measured under the conditions of 10 to 70 mPa s and the viscosity (V 2 ) measured under the conditions of a temperature of 25 ° C. and a shear rate of 0.1 sec -1 is 10,000 to 50 ,000 mPa ⁇ s.
- the hydroxyl-containing resin (A) is a resin having at least one hydroxyl group in one molecule.
- the hydroxyl-containing resin (A) for example, hydroxyl-containing acrylic resin (A1), hydroxyl-containing polyester resin (A2), hydroxyl-containing polyurethane resin (A3), hydroxyl-containing acrylic-modified polyester resin, hydroxyl-containing polyether resin, hydroxyl-containing Resins such as polycarbonate resins, hydroxyl group-containing epoxy resins, and hydroxyl group-containing alkyd resins can be used. These can be used alone or in combination of two or more.
- the hydroxyl value of the hydroxyl-containing resin (A) is preferably in the range of 1 to 200 mgKOH/g, from the viewpoint of the storage stability and popping resistance of the resulting coating composition, and is preferably in the range of 2 to 180 mgKOH/g. It is more preferably within the range, and particularly preferably within the range of 5 to 170 mgKOH/g.
- the content of the hydroxyl group-containing resin (A) in the coating composition of the present invention is based on the resin solid content in the coating composition, from the viewpoint of the storage stability and popping resistance of the coating composition to be obtained. 20 to 90% by mass is preferable, 25 to 87% by mass is more preferable, and 30 to 85% by mass is particularly preferable.
- solid content means non-volatile components such as resins, curing agents, and pigments that remain after drying at 110°C for 1 hour.
- a sample is weighed into a heat-resistant container such as an aluminum foil cup, spread over the bottom of the container, dried at 110 ° C. for 1 hour, and the mass of the remaining component after drying is weighed. can ask.
- solid content concentration means the content mass ratio of the solid content in the composition.
- the solid content concentration of the composition can be measured by weighing the composition into a heat-resistant container such as an aluminum foil cup, spreading the composition on the bottom surface of the container, drying at 110 ° C. for 1 hour, and remaining after drying It can be calculated by weighing the masses of the components in the composition, and determining the ratio of the mass of the components remaining after drying to the total mass of the composition before drying.
- the hydroxyl-containing resin (A) preferably contains a hydroxyl-containing acrylic resin (A1) from the viewpoint of the storage stability and popping resistance of the resulting coating composition.
- the hydroxyl-containing resin (A) preferably contains a hydroxyl-containing polyester resin (A2) from the viewpoint of the popping resistance of the coating composition to be obtained and the appearance of the coating film formed.
- the hydroxyl group-containing resin (A) contains a hydroxyl group-containing polyurethane resin (A3).
- the hydroxyl-containing acrylic resin (A1) usually comprises a hydroxyl-containing polymerizable unsaturated monomer (a) and another polymerizable unsaturated monomer (b) copolymerizable with the hydroxyl-containing polymerizable unsaturated monomer (a),
- a hydroxyl-containing polymerizable unsaturated monomer a polymerizable unsaturated monomer (a)
- b another polymerizable unsaturated monomer copolymerizable with the hydroxyl-containing polymerizable unsaturated monomer (a)
- a method known per se such as a solution polymerization method in an organic solvent and an emulsion polymerization method in an aqueous medium.
- the hydroxyl group-containing polymerizable unsaturated monomer (a) is a compound having at least one hydroxyl group and at least one polymerizable unsaturated group in one molecule, for example, 2-hydroxyethyl (meth)acrylate, 2-hydroxy Monoesters of (meth)acrylic acid and C2-C8 dihydric alcohols such as propyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate; these monoesters N-hydroxymethyl (meth)acrylamide; allyl alcohol; (meth)acrylate having a polyoxyethylene chain with a hydroxyl group at the molecular end, and the like.
- the monomer corresponding to (xvii) a polymerizable unsaturated monomer having an ultraviolet absorbing functional group described later is the hydroxyl group-containing polymerizable unsaturated monomer (a) and the other copolymerizable monomer. are defined as polyunsaturated monomers (b) and are excluded from the hydroxyl group-containing polymerizable unsaturated monomers (a).
- the hydroxyl group-containing polymerizable unsaturated monomer (a) can be used alone or in combination of two or more.
- the polymerizable unsaturated group means a radically polymerizable unsaturated group.
- examples of such polymerizable unsaturated groups include vinyl groups, (meth)acryloyl groups, (meth)acrylamide groups, vinyl ether groups, allyl groups, propenyl groups, isopropenyl groups, and maleimide groups.
- (meth)acrylate means acrylate or methacrylate
- (meth)acrylic acid means acrylic acid or methacrylic acid
- (meth)acryloyl means acryloyl or methacryloyl
- (meth)acrylamide means acrylamide or methacrylamide.
- the hydroxyl group-containing polymerizable unsaturated monomer (a) and the copolymerizable other polymerizable unsaturated monomer (b) are appropriately selected and used according to the properties desired for the hydroxyl group-containing acrylic resin (A1). can do.
- Specific examples of the monomer (b) include those described in (i) to (xix) below. These can be used alone or in combination of two or more.
- alkyl or cycloalkyl (meth)acrylates 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, dodecyl (meth) acrylate, tridecyl ( meth)acrylate, stearyl (meth)acrylate, isostearyl (meth)acrylate, cyclohexyl (meth)acrylate, methylcyclohexyl (meth)acrylate, tert-butylcyclohe
- a polymerizable unsaturated monomer having an isobornyl group such as isobornyl (meth)acrylate
- Polymerizable unsaturated monomers having an adamantyl group such as adamantyl (meth)acrylate.
- Polymerizable unsaturated monomers having a tricyclodecenyl group such as tricyclodecenyl (meth)acrylate.
- Aromatic ring-containing polymerizable unsaturated monomers for example, benzyl (meth)acrylate, styrene, ⁇ -methylstyrene, vinyltoluene and the like.
- polymerizable unsaturated monomers having an alkoxysilyl group for example, vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, ⁇ -(meth)acryloyloxypropyltrimethoxysilane, ⁇ -( meth)acryloyloxypropyltriethoxysilane and the like.
- polymerizable unsaturated monomers having a fluorinated alkyl group perfluoroalkyl (meth)acrylates such as perfluorobutylethyl (meth)acrylate and perfluorooctylethyl (meth)acrylate; fluoroolefins and the like.
- a polymerizable unsaturated monomer having a photopolymerizable functional group such as a maleimide group.
- Vinyl compounds for example, N-vinylpyrrolidone, ethylene, butadiene, chloroprene, vinyl propionate, vinyl acetate and the like.
- (x) carboxyl group-containing polymerizable unsaturated monomers for example, (meth)acrylic acid, maleic acid, crotonic acid, ⁇ -carboxyethyl acrylate and the like; (xi) nitrogen-containing polymerizable unsaturated monomers: for example, (meth)acrylonitrile, (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylate, N,N-diethylaminoethyl (meth)acrylate, N,N- dimethylaminopropyl(meth)acrylamide, methylenebis(meth)acrylamide, ethylenebis(meth)acrylamide, 2-(methacryloyloxy)ethyltrimethylammonium chloride, adducts of glycidyl(meth)acrylate and amine compounds, and the like.
- nitrogen-containing polymerizable unsaturated monomers for example, (meth)acrylonitrile, (meth)acryl
- epoxy group-containing polymerizable unsaturated monomers for example, glycidyl (meth)acrylate, ⁇ -methylglycidyl (meth)acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, 3,4-epoxycyclohexylethyl (meth)acrylate ) acrylate, 3,4-epoxycyclohexylpropyl (meth)acrylate, allyl glycidyl ether and the like.
- a (meth)acrylate having a polyoxyethylene chain with an alkoxy group at the molecular end for example, glycidyl (meth)acrylate, ⁇ -methylglycidyl (meth)acrylate, 3,4-epoxycyclohexylmethyl (meth)acrylate, 3,4-epoxycyclohexylethyl (meth)acrylate ) acrylate, 3,4-epoxycyclohexylpropyl (meth
- a polymerizable unsaturated monomer having a sulfonic acid group for example, 2-acrylamido-2-methylpropanesulfonic acid, 2-sulfoethyl (meth)acrylate, allylsulfonic acid, 4-styrenesulfonic acid; sodium salts, ammonium salts and the like.
- polymerizable unsaturated monomers having a phosphoric acid group acid phosphooxyethyl (meth)acrylate, acid phosphooxypropyl (meth)acrylate, acid phosphooxypoly(oxyethylene) glycol (meth)acrylate, acid phosphooxypoly (oxypropylene)glycol (meth)acrylate and the like.
- UV-absorbing functional groups such as 2-hydroxy-4-(3-methacryloyloxy-2-hydroxypropoxy)benzophenone, 2-hydroxy-4-(3-acryloyloxy-2 -hydroxypropoxy)benzophenone, 2,2'-dihydroxy-4-(3-acryloyloxy-2-hydroxypropoxy)benzophenone, 2-(2'
- photostable polymerizable unsaturated monomers for example 4-(meth)acryloyloxy-1,2,2,6,6-pentamethylpiperidine, 4-(meth)acryloyloxy-2,2,6, 6-tetramethylpiperidine, 4-cyano-4-(meth)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 and the like.
- (xix) a polymerizable unsaturated monomer having a carbonyl group: for example, acrolein, diacetone acrylamide, diacetone methacrylamide, acetoacetoxyethyl methacrylate, formyl styrene, vinyl alkyl ketone having 4 to 7 carbon atoms (for example, vinyl methyl ketone, vinyl ethyl ketone, vinyl butyl ketone) and the like.
- the hydroxyl group-containing acrylic resin (A1) can also be used in combination with a so-called urethane-modified acrylic resin, which is extended by subjecting some of the hydroxyl groups in the resin to a urethanization reaction with a polyisocyanate compound to increase the molecular weight.
- the hydroxyl group-containing polymerizable unsaturated monomer (a) is generally 1 It can be used within a range of up to 50% by mass, preferably 2 to 40% by mass, more preferably 3 to 30% by mass.
- the hydroxyl value of the hydroxyl-containing acrylic resin (A1) is preferably in the range of 1 to 200 mgKOH/g, and preferably in the range of 2 to 150 mgKOH/g, from the viewpoint of the storage stability of the resulting coating composition. It is more preferable that it is within the range of 5 to 100 mgKOH/g.
- the acid value of the hydroxyl group-containing acrylic resin (A1) is preferably in the range of 1 to 200 mgKOH/g, and 2 to 150 mgKOH, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. /g, and particularly preferably 5 to 80 mgKOH/g.
- the weight average molecular weight of the hydroxyl group-containing acrylic resin (A1) is preferably in the range of 2,000 to 5,000,000 from the viewpoint of the storage stability of the resulting coating composition. It is more preferably in the range of 000 to 1,000,000, and particularly preferably in the range of 8,000 to 500,000.
- the number average molecular weight and weight average molecular weight are the retention time (retention capacity) measured using gel permeation chromatography (GPC), and the retention time of standard polystyrene with a known molecular weight measured under the same conditions. It is a value obtained by converting to the molecular weight of polystyrene based on (holding capacity).
- GPC gel permeation chromatography
- HLC-8120GPC trade name, manufactured by Tosoh Corporation
- TSKgel G2000HXL (trade name, all manufactured by Tosoh Corporation), using a total of four, using a differential refractometer as a detector, mobile phase: tetrahydrofuran, measurement temperature: 40 ° C., flow rate: 1 mL / min can be measured under the conditions of
- the hydroxyl-containing acrylic resin (A1) has a polymerizable unsaturated group in one molecule from the viewpoint of storage stability and popping resistance of the resulting coating composition.
- a copolymer (I) obtained by copolymerizing a polymerizable unsaturated monomer (c) having at least two polymerizable unsaturated groups and a polymerizable unsaturated monomer (d) having one polymerizable unsaturated group in one molecule
- Copolymer (II) obtained by copolymerizing the core with the hydroxyl group-containing polymerizable unsaturated monomer (a) and a polymerizable unsaturated monomer (b) other than the hydroxyl group-containing polymerizable unsaturated monomer (a) It preferably contains a water-dispersible hydroxyl group-containing acrylic resin (A11) having a core/shell type multilayer structure in which the shell is a constituent component.
- Examples of the polymerizable unsaturated monomer (c) having at least two polymerizable unsaturated groups constituting the core in one molecule 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, neopentylglycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, pentaerythritol di(meth)acrylate , pentaerythritol tetra(meth)acrylate, glycerol di(meth)acrylate, 1,1,1-trishydroxymethylethane di(meth)acrylate, 1,1,1-trishydroxymethyl ethane
- the polymerizable unsaturated monomer (c) having at least two polymerizable unsaturated groups in one molecule is generally 0.1 to 30% by mass based on the total mass of the monomer (c) and the monomer (d), It can be used preferably within the range of 0.1 to 10% by mass, more preferably within the range of 0.1 to 5% by mass.
- the polymerizable unsaturated monomer (d) having one polymerizable unsaturated group in one molecule constituting the core is a polymerizable unsaturated monomer having at least two polymerizable unsaturated groups in one molecule. It is a polymerizable unsaturated monomer copolymerizable with (c), and includes compounds containing one polymerizable unsaturated group in one molecule, such as a vinyl group, a (meth)acryloyl group, an allyl group, etc. be.
- polymerizable unsaturated monomer (d) having one polymerizable unsaturated group in one molecule 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, 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 acrylate” (trade name, manufactured by Osaka Organic Chemical Industry Co., Ltd.), cyclohexyl (meth)acryl
- hydroxyl group-containing polymerizable unsaturated monomer (a) constituting the shell for example, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3 -Monoesterified product of (meth)acrylic acid and a dihydric alcohol having 2 to 8 carbon atoms such as hydroxypropyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate; (meth)acrylic acid and 2 to 8 carbon atoms ⁇ -caprolactone modified product of monoesterification with a dihydric alcohol; allyl alcohol; (meth)acrylate having a polyoxyethylene chain with a hydroxyl group at the molecular end. More than one species can be used in combination.
- the hydroxyl group-containing polymerizable unsaturated monomer (a) is generally 1 to 35% by mass, preferably 2 to 25% by mass, more preferably 3 to 20% by mass, based on the total mass of the monomers (a) and (b). It can be used within the range of % by mass.
- polymerizable unsaturated monomer (b) other than the hydroxyl group-containing polymerizable unsaturated monomer (a) constituting the shell a polymerizable unsaturated monomer other than the hydroxyl group-containing polymerizable unsaturated monomer (a) described above is used. (b) can be used. These can be used alone or in combination of two or more.
- the polymerizable unsaturated monomer (b) other than the hydroxyl group-containing polymerizable unsaturated monomer (a) has a carboxyl group-containing polymerizable It is preferred to include unsaturated monomers (e).
- Examples of the carboxyl group-containing polymerizable unsaturated monomer (e) include (meth)acrylic acid, maleic acid, crotonic acid, ⁇ -carboxyethyl acrylate, etc. Among them, (meth)acrylic acid is preferred.
- the carboxyl group-containing polymerizable unsaturated monomer (e) is based on the total mass of the monomer (a) and the monomer (b) from the viewpoint of the stability of the water-dispersible hydroxyl group-containing acrylic resin (A11) in an aqueous medium. , generally 1 to 40% by mass, particularly 1 to 25% by mass, and more particularly preferably 1 to 19% by mass.
- the hydroxyl value of the water-dispersible hydroxyl-containing acrylic resin (A11) is preferably in the range of 1 to 100 mgKOH/g from the viewpoint of the storage stability of the resulting coating composition, and 2 to 90 mgKOH/g. It is more preferably within the range, and particularly preferably within the range of 5 to 85 mgKOH/g.
- the acid value of the water-dispersible hydroxyl group-containing acrylic resin (A11) is preferably in the range of 3 to 90 mgKOH/g from the viewpoint of the storage stability and popping resistance of the resulting coating composition. It is more preferably in the range of 4 to 70 mgKOH/g, particularly preferably in the range of 5 to 50 mgKOH/g.
- the monomer (a) and the monomer (b) have only one polymerizable unsaturated group per molecule. It is preferable to use an unsaturated monomer and make the shell of the water-dispersible hydroxyl group-containing acrylic resin (A11) uncrosslinked.
- the water-dispersible hydroxyl-containing acrylic resin (A11) includes, for example, 0.1 to 30% by mass of a polymerizable unsaturated monomer (c) having at least two polymerizable unsaturated groups in one molecule and the polymerizable unsaturated
- a polymerizable unsaturated monomer (c) having at least two polymerizable unsaturated groups in one molecule
- the hydroxyl group-containing polymerizable unsaturated Obtained by adding a monomer mixture (II) containing 1 to 35% by mass of a saturated monomer (a) and 65 to 99% by mass of a polymerizable unsaturated monomer (b) other than the monomer (a) and further polymerizing can be done.
- the emulsion polymerization of the monomer mixture can be carried out by a method known per se, for example, using a polymerization initiator in the presence of an emulsifier.
- anionic emulsifier or a nonionic emulsifier is suitable as the emulsifier.
- the anionic emulsifier include sodium salts and ammonium salts of organic acids such as alkylsulfonic acid, alkylbenzenesulfonic acid and alkylphosphoric acid.
- nonionic emulsifier examples include polyoxyethylene oleyl Ether, polyoxyethylene stearyl ether, polyoxyethylene lauryl ether, polyoxyethylene tridecyl ether, polyoxyethylene phenyl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene monolaurate, polyoxy Ethylene monostearate, polyoxyethylene monooleate, sorbitan monolaurate, sorbitan monostearate, sorbitan trioleate, polyoxyethylene sorbitan monolaurate and the like.
- Reactive anionic emulsifiers may be used, and it is preferred to use reactive anionic emulsifiers.
- Examples of the reactive anionic emulsifier include sodium salts and ammonium salts of sulfonic acid compounds having radically polymerizable unsaturated groups such as (meth)allyl groups, (meth)acryloyl groups, propenyl groups and butenyl groups. can. Among them, an ammonium salt of a sulfonic acid compound having a radically polymerizable unsaturated group is preferable because the formed coating film has excellent water resistance. Examples of the ammonium salt of the sulfonic acid compound include commercially available products such as "Latemul S-180A" (trade name, manufactured by Kao Corporation).
- ammonium salts of sulfonic acid compounds having a radically polymerizable unsaturated group ammonium salts of sulfonic acid compounds having a radically polymerizable unsaturated group and a polyoxyalkylene group are more preferable.
- ammonium salt of a sulfonic acid compound having a radically polymerizable unsaturated group and a polyoxyalkylene group include "Aqualon KH-10" (trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), "SR-1025A” (trade name, manufactured by Asahi Denka Kogyo Co., Ltd.).
- the emulsifier is usually used in an amount of 0.1 to 15% by mass, preferably 0.5 to 10% by mass, more preferably 1 to 5% by mass, based on the total amount of all monomers used. be able to.
- the polymerization initiator may be of either oil-soluble or water-soluble type, for example, benzoyl peroxide, octanoyl peroxide, lauroyl peroxide, stearoyl peroxide, cumene hydroperoxide, tert- Organic peroxides such as butyl peroxide, tert-butylperoxylaurate, tert-butylperoxyisopropyl carbonate, tert-butylperoxyacetate, diisopropylbenzene hydroperoxide; azobisisobutyronitrile, azobis(2, 4-dimethylvaleronitrile), azobis(2-methylpropiononitrile), azobis(2-methylbutyronitrile), 4,4'-azobis(4-cyanobutanoic acid), dimethylazobis(2-methylpropionate) , azo compounds such as azobis[2-methyl-N-(2-hydroxyethyl)-propionamide], azobis ⁇ 2-methyl
- the polymerization initiator may optionally be used in combination with a reducing agent such as sugar, sodium formaldehyde sulfoxylate, iron complex, or the like to form a redox polymerization system.
- a reducing agent such as sugar, sodium formaldehyde sulfoxylate, iron complex, or the like to form a redox polymerization system.
- the above polymerization initiator within the range of usually 0.1 to 5% by mass, particularly 0.2 to 3% by mass, based on the total mass of all monomers used.
- the method of adding the polymerization initiator is not particularly limited, and can be appropriately selected according to its type, amount, and the like.
- the polymerization initiator may be included in advance in the monomer mixture or the aqueous medium, or may be added all at once or added dropwise during the polymerization.
- the water-dispersible hydroxyl-containing acrylic resin (A11) is prepared by adding the hydroxyl-containing polymerizable unsaturated monomer (a) and a polymerizable unsaturated monomer (b) other than the monomer (a) to the emulsion obtained as described above. It can be obtained by adding a monomer mixture (II) containing and further polymerizing.
- the above monomer mixture (II) can optionally contain components such as polymerization initiators, chain transfer agents, reducing agents, and emulsifiers as listed above.
- the monomer mixture (II) can be added dropwise as it is, it is desirable to disperse the monomer mixture (II) in an aqueous medium and add it dropwise as a monomer emulsion.
- the particle size of the monomer emulsion in this case is not particularly limited.
- Polymerization of the monomer mixture (II) can be carried out, for example, by adding the monomer mixture (II), which may be emulsified, all at once or dropwise to the emulsion, and heating to a suitable temperature while stirring. can.
- the water-dispersible hydroxyl-containing acrylic resin (A11) obtained as described above comprises a polymerizable unsaturated monomer (c) having at least two polymerizable unsaturated groups in one molecule and the polymerizable unsaturated group
- the core is a copolymer (I) formed from the monomer mixture (I) containing a polymerizable unsaturated monomer (d) having one per molecule, and the hydroxyl group-containing polymerizable unsaturated monomer (a) and the copolymer (II) formed from the monomer mixture (II) containing a polymerizable unsaturated monomer (b) other than the monomer (a) as a shell. can.
- the water-dispersible hydroxyl-containing acrylic resin (A11) is a polymerizable nonpolymer that forms another resin layer between the step of obtaining the copolymer (I) and the step of obtaining the copolymer (II).
- the resin particles may be made up of three or more layers.
- the "shell” of the water-dispersible hydroxyl group-containing acrylic resin (A11) means the polymer layer present in the outermost layer of the resin particle, and the “core” means the inner layer of the resin particle excluding the shell portion.
- a “core/shell type structure” means a structure having the above core and shell.
- the core/shell type structure generally has a layered structure in which the core is completely covered with the shell. It may not be enough. In such a case, it is not necessary to have a complete layer structure as described above, and it may be a structure in which a part of the core is covered with a shell, or a polymerizable It may have a structure in which an unsaturated monomer is graft-polymerized.
- the concept of multilayer structure in the above core/shell type structure also applies to the case where a multilayer structure is formed in the core of the water-dispersible hydroxyl group-containing acrylic resin (A11).
- the ratio of the copolymer (I) and the copolymer (II) in the water-dispersible hydroxyl-containing acrylic resin (A11) having a core/shell type multilayer structure is determined by the storage stability of the resulting coating composition, etc. From the viewpoint of the solid content mass ratio of copolymer (I) / copolymer (II), generally 10/90 to 90/10, particularly 50/50 to 85/15, more particularly 65/35 to 80/ It is preferably in the range of 20.
- the water-dispersible hydroxyl-containing acrylic resin (A11) obtained as described above generally has an average particle size within the range of 10 to 1,000 nm, particularly 20 to 500 nm.
- the average particle size of the hydroxyl group-containing acrylic resin is a value measured at 20°C after diluting with deionized water in a conventional manner using a particle size distribution measuring device based on dynamic light scattering.
- a particle size distribution measuring device using the dynamic light scattering method for example, "ELSZ-2000" (trade name, manufactured by Otsuka Electronics Co., Ltd.) can be used.
- acidic groups such as carboxyl groups possessed by the water-dispersible hydroxyl-containing acrylic resin (A11) are Neutralization with a soothing agent is desirable.
- the neutralizing agent is not particularly limited as long as it can neutralize acidic groups.
- Examples include sodium hydroxide, potassium hydroxide, trimethylamine, 2-(dimethylamino)ethanol, 2-amino-2-methyl-1-propanol, triethylamine, aqueous ammonia, etc., can be mentioned, and these neutralizing agents are used to adjust the pH of the aqueous dispersion of the dispersible hydroxyl group-containing acrylic resin (A11) after neutralization to about It is desirable to use an amount of 6.5 to about 9.0.
- the water-dispersible hydroxyl-containing acrylic resin (A11) can contain a water-dispersible hydroxyl-containing acrylic resin (A11') containing a gradient polymer layer.
- the gradient polymer layer of the water-dispersible hydroxyl-containing acrylic resin (A11') containing the gradient polymer layer means a polymer layer having a layer structure in which the composition changes continuously (having a composition gradient).
- the gradient polymer layer can generally be obtained by a known polymerization method called power feed polymerization. Specifically, for example, when two types of monomer A (or monomer mixture A) and monomer B (or monomer mixture B) are polymerized, monomer B (or monomer mixture B) is added to monomer A (or monomer A gradient polymer layer can be obtained by introducing the monomer A (or the monomer mixture A) into a reaction vessel and conducting a polymerization reaction while dropping it into a vessel containing the mixture A).
- the synthesis conditions timing of starting mixing of monomer A (or monomer mixture A) and monomer B (or monomer mixture B), monomer B (or monomer mixture B), monomer A (or monomer mixture A ) and the rate of introducing monomer A (or monomer mixture A) into the reaction vessel, a gradient polymer layer having a desired composition gradient can be obtained.
- the water-dispersible hydroxyl-containing acrylic resin (A11′) containing a gradient polymer layer comprises a core portion which is a copolymer (I) having a polymerizable unsaturated monomer as a copolymerization component, and a polymerizable unsaturated monomer as a copolymerization component. It is an acrylic resin consisting of a shell portion which is a copolymer (II) which is a polymer (II), and a gradient polymer layer which exists between the core portion and the shell portion.
- the polymerizable unsaturated monomers which are constituent monomers of the core portion and the shell portion, respectively, include the hydroxyl group-containing polymerizable unsaturated monomer and other polymerizable unsaturated monomers copolymerizable with the hydroxyl group-containing polymerizable unsaturated monomer. Any appropriate combination of monomers can be used.
- Emulsion polymerization for preparing an emulsion of the core copolymer (I) can be carried out by a conventionally known method. For example, it can be carried out by emulsion polymerization of a polymerizable unsaturated monomer mixture using a polymerization initiator in the presence of an emulsifier.
- a polymerization initiator for example, the emulsifier and polymerization initiator described above can be used.
- the gradient polymer layer can be formed by the aforementioned power feed polymerization or the like.
- a polymerizable unsaturated monomer mixture used for emulsion polymerization of the core copolymer (I) and a polymerizable unsaturated monomer mixture used for emulsion polymerization of the shell copolymer (II) are generally used.
- Monomer mixtures can be used.
- the water-dispersible hydroxyl-containing acrylic resin (A11') containing the gradient polymer layer can be obtained by further forming the shell portion copolymer (II).
- the monomer mixture for forming the shell portion copolymer (II) can optionally contain components such as the polymerization initiator, chain transfer agent, reducing agent, and emulsifier.
- the monomer mixture can be added dropwise as it is, it is preferable to add dropwise as a monomer emulsion obtained by dispersing the monomer mixture in an aqueous medium.
- the particle size of the monomer emulsion in this case is not particularly limited.
- the monomer mixture or an emulsion thereof is added dropwise all at once or gradually added dropwise to obtain the above-mentioned core portion copolymerization.
- a method of adding to the emulsion of united (I) and heating to a suitable temperature while stirring can be mentioned.
- the ratio of the gradient polymer layer in the water-dispersible hydroxyl-containing acrylic resin (A11′) containing the gradient polymer layer is determined from the viewpoint of the water resistance of the resulting coating film, etc., the water-dispersible hydroxyl-containing acrylic resin containing the gradient polymer layer. It is preferably in the range of 20 to 80% by mass, more preferably in the range of 25 to 75% by mass, more preferably in the range of 30 to 70% by mass, based on the total amount of all copolymerization components of (A11'). Within the range is particularly preferred.
- the water-dispersible hydroxyl-containing acrylic resin (A11′) containing the gradient polymer layer has a hydroxyl value of 1 to 150 mgKOH/g from the viewpoint of curability, chipping resistance, adhesion and finished appearance of the resulting coating film. is preferably within the range of , more preferably within the range of 2 to 120 mgKOH/g, and particularly preferably within the range of 5 to 100 mgKOH/g.
- the core part of the water-dispersible hydroxyl-containing acrylic resin (A11′) containing the gradient polymer layer has a hydroxyl value in the range of 0 to 150 mgKOH/g from the viewpoint of water resistance and chipping resistance of the resulting coating film. , more preferably in the range of 5 to 120 mgKOH/g, particularly preferably in the range of 10 to 100 mgKOH/g.
- the shell part of the water-dispersible hydroxyl-containing acrylic resin (A11′) containing the gradient polymer layer has a hydroxyl value in the range of 0 to 150 mgKOH/g from the viewpoint of water resistance and chipping resistance of the resulting coating film. , more preferably in the range of 2 to 120 mgKOH/g, particularly preferably in the range of 5 to 100 mgKOH/g.
- the water-dispersible hydroxyl-containing acrylic resin (A11') containing the gradient polymer layer has an acid value in the range of 1 to 80 mgKOH/g from the viewpoint of the storage stability of the paint and the water resistance of the resulting coating film. preferably within the range of 5 to 50 mgKOH/g, particularly preferably within the range of 5 to 30 mgKOH/g.
- the core part of the water-dispersible hydroxyl group-containing acrylic resin (A11′) containing the gradient polymer layer has an acid value in the range of 0 to 50 mgKOH/g from the viewpoint of production stability and storage stability of the paint. preferably in the range of 0 to 30 mgKOH/g, particularly preferably in the range of 0 to 10 mgKOH/g.
- the shell portion of the water-dispersible hydroxyl-containing acrylic resin (A11′) containing the gradient polymer layer has an acid value of 1 to 100 mgKOH/g from the viewpoint of the storage stability of the paint and the water resistance of the resulting coating film. It is preferably within the range, more preferably within the range of 5 to 80 mgKOH/g, and particularly preferably within the range of 10 to 50 mgKOH/g.
- the water-dispersible hydroxyl-containing acrylic resin (A11′) containing the gradient polymer layer preferably has a glass transition temperature of 20° C. or higher from the viewpoint of the water resistance, hardness, chipping resistance, etc. of the resulting coating film. , more preferably 30°C or higher, and particularly preferably 30 to 100°C.
- the core portion of the water-dispersible hydroxyl-containing acrylic resin (A11′) containing the gradient polymer layer has a glass transition temperature of ⁇ It is preferably in the range of 50 to 50°C, more preferably in the range of -30 to 50°C, and particularly preferably in the range of 0 to 50°C.
- the shell portion of the water-dispersible hydroxyl-containing acrylic resin (A11′) containing the gradient polymer layer preferably has a glass transition temperature of 40° C. or higher from the viewpoint of the hardness and water resistance of the resulting coating film. It is more preferably 50°C or higher, and particularly preferably in the range of 50 to 100°C.
- W1, W2, . . . Wn are the mass fractions of each monomer
- the glass transition temperature of the homopolymer of each monomer is described in POLYMER HANDBOOK Fourth Edition, J. Am. Brandrup, E. h. Immergut, E.; A. Grulke (1999). Values are used as the temperature is measured by differential scanning calorimetry.
- the content of the hydroxyl group-containing acrylic resin (A1) is determined from the viewpoint of flip-flop properties and chipping resistance of the formed coating film. , Based on the resin solid content in the coating composition, it is preferably in the range of 1 to 60% by mass, more preferably in the range of 10 to 55% by mass, and in the range of 15 to 50% by mass. is particularly preferred.
- the hydroxyl-containing polyester resin (A2) for example, uses a polyol having two or more hydroxyl groups as an alcohol component, uses a polycarboxylic acid having two or more carboxyl groups as an acid component, and It can be obtained by condensing the components.
- a polyhydric alcohol having two or more hydroxyl groups in one molecule can be suitably used as the polyol.
- the polyhydric alcohol include 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, tetramethylene glycol, 3-methyl-4,3-pentanediol, 3-methyl
- polyether diol compound of trihydric or higher alcohols such as mannite; polylactone polyol compounds obtained by adding lactone compounds such as ⁇ -caprolactone to these trihydric or higher alcohols; fatty acid esters of glycerin;
- alcohol components other than the above polyols can also be used.
- Such alcohol components are not particularly limited, and examples include monoalcohols such as methanol, ethanol, propyl alcohol, butyl alcohol, stearyl alcohol, and 2-phenoxyethanol; and alcohol compounds obtained by reacting monoepoxy compounds such as glycidyl esters of synthetic highly branched saturated fatty acids with acids.
- polycarboxylic acid compounds commonly used in the production of polyester resins can be used.
- examples of such polycarboxylic acids include aliphatic polybasic acids, alicyclic polybasic acids, and aromatic polybasic acids.
- the above-mentioned aliphatic polybasic acids are generally aliphatic compounds having two or more carboxyl groups in one molecule, acid anhydrides of the aliphatic compounds, and esters of the aliphatic compounds.
- aliphatic polybasic acids include succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, brassylic acid, octadecanedioic acid, citric acid, butane Aliphatic polycarboxylic acids such as tetracarboxylic acids; anhydrides of the aliphatic polycarboxylic acids; lower alkyl esters of the aliphatic polycarboxylic acids having 1 to 6 carbon atoms, preferably 1 to 4, and the like. be done.
- the above aliphatic polybasic acids can be used either singly or in combination of two or more.
- the above alicyclic polybasic acids are generally compounds having one or more alicyclic structures and two or more carboxyl groups in one molecule, acid anhydrides of these compounds, and esterified compounds of these compounds.
- Alicyclic structures can be predominantly 4- to 6-membered ring structures.
- Alicyclic polybasic acids include, for example, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 4-cyclohexene-1,2-dicarboxylic acid, 3-methyl- Alicyclic polycarboxylic acids such as 1,2-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid, 1,2,4-cyclohexanetricarboxylic acid, and 1,3,5-cyclohexanetricarboxylic acid; Anhydrides of alicyclic polycarboxylic acids; lower alkyl esters of alicyclic polycarboxylic acids having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, and the like. The above alicyclic polybasic acids can be used alone or in combination of two or more.
- the aromatic polybasic acid is generally an aromatic compound having two or more carboxyl groups in one molecule, an acid anhydride of the aromatic compound, and an esterified product of the aromatic compound.
- aromatic polybasic acids include aromatic polycarboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, 4,4′-biphenyldicarboxylic acid, trimellitic acid, and pyromellitic acid; anhydrides of group polyvalent carboxylic acids; lower alkyl esters of said aromatic polyvalent carboxylic acids having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms, and the like.
- the above aromatic polybasic acids can be used alone or in combination of two or more.
- phthalic acid, phthalic anhydride, isophthalic acid, trimellitic acid, and trimellitic anhydride are preferably used, and trimellitic anhydride is more preferably used.
- Acid components other than the above aliphatic polybasic acids, alicyclic polybasic acids, and aromatic polybasic acids can also be used.
- Such acid components are not particularly limited, and examples include coconut oil fatty acid, cotton seed 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, Fatty acids such as castor oil fatty acid, dehydrated castor oil fatty acid, safflower oil fatty acid; lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, linolenic acid, benzoic acid, p-tert-butylbenzoic acid, cyclohexane acids, monocarboxylic acids such as 10-phenyloctadecanoic acid; hydroxycarboxylic acids such as lactic
- the method for producing the hydroxyl group-containing polyester resin (A2) is not particularly limited, and can be carried out according to ordinary methods.
- the alcohol component and the acid component are heated in a nitrogen stream at about 150 to 250° C. for about 5 to 10 hours, and the alcohol component and the acid component are subjected to an esterification reaction or a transesterification reaction. , the hydroxyl group-containing polyester resin (A2) can be produced.
- the alcohol component and the acid component are subjected to the esterification reaction or the transesterification reaction, these components may be added at once to the reaction vessel, or one or both may be added in several batches. good too.
- the resulting hydroxyl group-containing polyester resin may be reacted with an acid anhydride to effect half-esterification to obtain a carboxyl group- and hydroxyl group-containing polyester resin.
- the hydroxyl group-containing polyester resin may be produced by first synthesizing the carboxyl group-containing polyester resin and then adding the alcohol component thereto.
- dibutyltin oxide, antimony trioxide, zinc acetate, manganese acetate, cobalt acetate, calcium acetate, lead acetate, tetrabutyl titanate, and tetraisopropyl are used as catalysts to promote the reaction.
- Catalysts known per se, such as titanates, can be used.
- the hydroxyl group-containing polyester resin (A2) can be modified with a fatty acid, a monoepoxy compound, a polyisocyanate compound, or the like during or after production of the resin.
- fatty acids examples include coconut oil fatty acid, cottonseed oil fatty acid, hemp seed oil fatty acid, rice bran oil fatty acid, fish oil fatty acid, tall oil fatty acid, soybean oil fatty acid, linseed oil fatty acid, tung oil fatty acid, rapeseed oil fatty acid, castor oil fatty acid, and dehydrated castor.
- Oil fatty acids, safflower oil fatty acids, and the like can be mentioned, and as the monoepoxy compound, for example, "Cardura E10P" (trade name, manufactured by HEXION, glycidyl ester of synthetic highly branched saturated fatty acid) can be preferably used.
- polyisocyanate compound the polyisocyanates exemplified in the polyisocyanate component (a2) can be used. These can be used individually or in combination of 2 or more types.
- the hydroxyl value of the hydroxyl-containing polyester resin (A2) is preferably in the range of 1 to 200 mgKOH/g, and 2 to 180 mgKOH/g, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. is more preferably within the range of , and particularly preferably within the range of 5 to 170 mgKOH/g.
- the weight average molecular weight of the hydroxyl group-containing polyester resin (A2) is preferably within the range of 500 to 50,000 from the viewpoint of the storage stability and popping resistance of the resulting coating composition. It is more preferably in the range of 000 to 30,000, and particularly preferably in the range of 1,200 to 10,000.
- the glass transition temperature (Tg) of the hydroxyl group-containing polyester resin (A2) is in the range of -20°C to 50°C from the viewpoint of the storage stability and popping resistance of the resulting coating composition. It is preferably in the range of -10°C to 40°C, and particularly preferably in the range of -5°C to 35°C.
- the hydroxyl-containing polyester resin (A2) preferably has a carboxyl group from the viewpoint of the storage stability of the resulting coating composition.
- the acid value of the hydroxyl group-containing polyester resin (A2) is 5 to 150 mgKOH/ from the viewpoint of the storage stability and popping resistance of the resulting coating composition. preferably within the range of 10 to 140 mg KOH/g, particularly preferably within the range of 15 to 120 mg KOH/g.
- the content of the hydroxyl-containing polyester resin (A2) is determined from the viewpoint of the storage stability and popping resistance of the resulting coating composition. , Based on the resin solid content in the coating composition, it is preferably in the range of 1 to 45% by mass, more preferably in the range of 5 to 40% by mass, and in the range of 10 to 35% by mass. is particularly preferred.
- Hydroxyl group-containing polyurethane resin (A3) examples include a hydroxyl group-containing polyurethane resin obtained by reacting a polyol with a polyisocyanate.
- polyols examples include low-molecular-weight polyols such as dihydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, butylene glycol and hexamethylene glycol, and trihydric alcohols such as trimethylolpropane, glycerin and pentaerythritol. can be done.
- Polyether polyols, polyester polyols, acrylic polyols, epoxy polyols and the like can be mentioned as those having high molecular weights.
- Polyether polyols include polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like.
- polyester polyol examples include alcohols such as the aforementioned dihydric alcohols, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol, and neopentyl glycol, and dibasic acids such as adipic acid, azelaic acid, and sebacic acid.
- Carboxyl group-containing polyols such as 2,2-dimethylolpropionic acid and 2,2-dimethylolbutanoic acid can also be used.
- polyisocyanates to be reacted with the above polyols include aliphatic polyisocyanate compounds such as hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, dimer acid diisocyanate, and lysine diisocyanate; and burette type addition of these polyisocyanates.
- isocyanurate cycloadduct isophorone diisocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), methylcyclohexane-2,4- (or -2,6-) diisocyanate, 1,3- (or 1,4-) Alicyclic diisocyanate compounds such as di(isocyanatomethyl)cyclohexane, 1,4-cyclohexanediisocyanate, 1,3-cyclopentanediisocyanate, 1,2-cyclohexanediisocyanate; and biuret-type adducts of these polyisocyanates, isocyanate Nurate cycloadduct; xylylene diisocyanate, meta-xylylene diisocyanate, tetramethylxylylene diisocyanate, tolylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 1,5-naphthalene diiso
- the hydroxyl value of the hydroxyl-containing polyurethane resin (A3) is preferably in the range of 1 to 150 mgKOH/g, more preferably 1 to 100 mgKOH/g, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. is more preferably within the range of , particularly preferably within the range of 1 to 50 mgKOH/g.
- the acid value of the hydroxyl group-containing polyurethane resin (A3) is preferably in the range of 3 to 90 mgKOH/g, more preferably 4 to 70 mgKOH/g, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. is more preferably within the range of , and particularly preferably within the range of 5 to 50 mgKOH/g.
- the number average molecular weight of the hydroxyl group-containing polyurethane resin (A3) is preferably 10,000 or more, more preferably 50,000 or more, more preferably 100,000 or more, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. is particularly preferred.
- the content of the hydroxyl group-containing polyurethane resin (A3) is, from the viewpoint of the storage stability and popping resistance of the resulting coating composition, Based on the resin solid content in the coating composition, it is preferably within the range of 3 to 60% by mass, more preferably within the range of 5 to 40% by mass, and within the range of 7 to 30% by mass. It is particularly preferred to have
- Curing agent (B) is not particularly limited.
- a cross-linking agent having reactivity with the hydroxyl groups of the hydroxyl-containing resin (B) can be used.
- cross-linking agents specifically, for example, amino resin (B1), polyisocyanate compound (B2), blocked polyisocyanate compound (B3), polyhydrazide compound, polysemicarbazide compound, Examples include carbodiimide compounds, oxazoline group-containing compounds, epoxy compounds, and polycarboxylic acids.
- the cross-linking agents may be used alone or in combination of two or more.
- the curing agent (B) is selected from amino resins (B1), polyisocyanate compounds (B2), and blocked polyisocyanate compounds (B3) from the viewpoint of glass adhesion and chipping resistance of the coating film to be formed. It preferably contains at least one cross-linking agent, more preferably contains the amino resin (B1) and/or the blocked polyisocyanate compound (B3), and the amino resin (B1) and the blocked polyisocyanate compound (B3) are It is particularly preferred to include
- Amino resin (B1) As the amino resin (B1), a partially methylolated amino resin or a fully methylolated amino resin obtained by reacting an amino component and an aldehyde component can be used.
- amino components include melamine, urea, benzoguanamine, acetoguanamine, steroguanamine, spiroguanamine, dicyandiamide, and the like.
- aldehyde components include formaldehyde, paraformaldehyde, acetaldehyde, and benzaldehyde.
- a product obtained by partially or completely etherifying the methylol group of the above methylolated amino resin with a suitable alcohol can also be used.
- suitable alcohols that can be used for etherification include methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, 2-ethyl-1-butanol, 2-ethyl-1-hexanol, and the like. mentioned.
- a melamine resin is preferable as the amino resin (B1).
- methyl-etherified melamine resins in which the methylol groups of partially or fully methylolated melamine resins are partially or fully etherified with methyl alcohol, and methylol groups of partially or fully methylolated melamine resins are partially or fully etherified with butyl alcohol.
- butyl-etherified melamine resins, methyl-butyl mixed etherified melamine resins in which the methylol groups of partially or fully methylolated melamine resins are partially or fully etherified with methyl alcohol and butyl alcohol are preferred, and methyl-butyl mixed Etherified melamine resins are more preferred.
- the weight average molecular weight of the melamine resin is preferably within the range of 450 to 6,000, more preferably within the range of 500 to 4,000, and within the range of 550 to 3,000. is particularly preferred.
- a commercially available product can be used as the melamine resin.
- Commercial product names include, for example, “Cymel 202", “Cymel 203", “Cymel 211", “Cymel 238", “Cymel 251", “Cymel 254", “Cymel 303", “Cymel 325", “Cymel 327”, “Cymel 350”, “Cymel 370”, “Cymel 385”, “Cymel 1156”, “Cymel 1158”, “Cymel 1130” (manufactured by Allnex Japan Co., Ltd.); “Uban 28-60” (manufactured by Mitsui Chemicals, Inc.);
- a sulfonic acid such as p-toluenesulfonic acid, dodecylbenzenesulfonic acid, or dinonylnaphthalenesulfonic acid may optionally be used as a curing catalyst;
- a salt; a neutralized salt of a phosphoric acid ester compound and an amine, etc. can be used.
- the amino resin (B1) can be used, for example, as a cross-linking agent for resins containing hydroxyl groups.
- Polyisocyanate compound (B2) The polyisocyanate compound (B2) is a compound having two or more isocyanate groups in one molecule.
- the polyisocyanate compound (B2) includes, for example, aliphatic polyisocyanates, alicyclic polyisocyanates, araliphatic polyisocyanates, aromatic polyisocyanates, derivatives of these polyisocyanates, and the like.
- 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 acid diisocyanate, methyl 2,6-diisocyanatohexanoate (common name: lysine diisocyanate);2 ,6-diisocyanatohexanoate 2-isocyanatoethyl, 1,6-diisocyanato-3-isocyanatomethylhexane, 1,4,8-triisocyanatooctane, 1,6,11-triisocyanatoundecane,
- alicyclic polyisocyanate examples include 1,3-cyclopentene diisocyanate, 1,4-cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (common name : isophorone diisocyanate), methyl-2,4-cyclohexane diisocyanate, methyl-2,6-cyclohexane diisocyanate, 1,3- or 1,4-bis(isocyanatomethyl)cyclohexane (common name: hydrogenated xylylene diisocyanate) or Alicyclic diisocyanates such as mixtures thereof, norbornane diisocyanate; 1,3,5-triisocyanatocyclohexane, 1,3,5-trimethylisocyanatocyclohexane, 2-(3-isocyanatopropyl)-2,5-di( isocyan
- araliphatic polyisocyanate examples include 1,3- or 1,4-xylylene diisocyanate or a mixture thereof, ⁇ , ⁇ '-diisocyanato-1,4-diethylbenzene, 1,3- or 1,4-bis Aroliphatic diisocyanates such as (1-isocyanato-1-methylethyl)benzene (common name: tetramethylxylylene diisocyanate) or mixtures thereof; araliphatic triisocyanates such as 1,3,5-triisocyanatomethylbenzene; can be mentioned.
- aromatic polyisocyanate examples include m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4′-diphenyl diisocyanate, 1,5-naphthalene diisocyanate, 2,4′- or 4,4′-diphenylmethane diisocyanate, or Aromatic diisocyanates such as mixtures, 2,4- or 2,6-tolylene diisocyanate or mixtures thereof, 4,4'-toluidine diisocyanate, 4,4'-diphenylether diisocyanate; triphenylmethane-4,4',4' Aromatic triisocyanates such as '-triisocyanate, 1,3,5-triisocyanatobenzene, 2,4,6-triisocyanatotoluene; 4,4'-diphenylmethane-2,2',5,5'- Aromatic tetraisocyanates such as tetraisocyanate can be mentioned.
- polyisocyanate derivatives examples include dimers, trimers, biurets, allophanates, uretdiones, urethymines, isocyanurates, oxadiazinetriones, polymethylene polyphenyl polyisocyanates (crude MDI, polymeric MDI) of the polyisocyanate compounds described above, Crude TDI etc. can be mentioned.
- polyisocyanates and derivatives thereof may be used alone or in combination of two or more.
- aliphatic diisocyanates, alicyclic diisocyanates and derivatives thereof are preferably used alone or in combination of two or more.
- polyisocyanate compound (B2) a prepolymer obtained by subjecting the above polyisocyanate and its derivatives to a polyhydric alcohol, a low-molecular-weight polyester resin, or water to undergo a urethanization reaction under conditions in which the isocyanate groups are in excess is used.
- an organic metal compound, an acid compound, a base compound, or the like can optionally be used as a curing catalyst.
- the above polyisocyanate compound (B2) can be used, for example, as a cross-linking agent for resins containing hydroxyl groups or amino groups.
- the blocked polyisocyanate compound (B3) is a compound obtained by blocking the isocyanate groups of the polyisocyanate compound (B2) with a blocking agent.
- the blocking agent examples include phenolic blocking agents such as phenol, cresol, xylenol, nitrophenol, ethylphenol, hydroxydiphenyl, butylphenol, isopropylphenol, nonylphenol, octylphenol, and methyl hydroxybenzoate; ⁇ -caprolactam, ⁇ -valero; Lactam blocking agents such as lactam, ⁇ -butyrolactam and ⁇ -propiolactam; Aliphatic alcohol blocking agents such as methanol, ethanol, propyl alcohol, butyl alcohol, amyl alcohol and lauryl alcohol; Ether-based blocking agents such as ethyl ether, ethylene glycol monobutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, methoxymethanol; benzyl alcohol, glycolic acid, methyl glycolate, ethyl glycolate, butyl glycolate, lactic acid
- azole blocking agent examples include pyrazole, 3,5-dimethylpyrazole, 3-methylpyrazole, 4-benzyl-3,5-dimethylpyrazole, 4-nitro-3,5-dimethylpyrazole, 4-bromo-3 ,5-dimethylpyrazole, 3-methyl-5-phenylpyrazole and the like pyrazole or pyrazole derivatives; imidazole, benzimidazole, 2-methylimidazole, 2-ethylimidazole, 2-phenylimidazole and other imidazole or imidazole derivatives; 2-methyl Examples include imidazoline derivatives such as imidazoline and 2-phenylimidazoline.
- an oxime-based blocking agent an active methylene-based blocking agent, pyrazole or a pyrazole derivative are suitable.
- a hydroxycarboxylic acid having one or more hydroxyl groups and one or more carboxyl groups such as hydroxypivalic acid and dimethylolpropionic acid, can be used.
- the blocked polyisocyanate is used in the coating composition of the present invention
- the hydroxycarboxylic acid is used to block the isocyanate group, and then the carboxyl group of the hydroxycarboxylic acid is neutralized to impart water dispersibility.
- a blocked polyisocyanate compound can be preferably used.
- the blocked polyisocyanate compound (B3) is derived from a spacer having at least two isocyanate-reactive functional groups from the viewpoint of the appearance of the coating film formed and the adhesion between the coating film formed and the substrate. It preferably contains a structure.
- the above functional group is not particularly limited as long as it is a functional group having reactivity with an isocyanate group.
- the isocyanate-reactive functional group include hydroxyl group, amino group, carboxyl group, thiol group, etc. Among them, hydroxyl group and amino group are preferable, and hydroxyl group is particularly preferable.
- the spacer is preferably a compound having at least two hydroxyl groups or a compound having at least two amino groups, more preferably a compound having at least two hydroxyl groups.
- Examples of the compound having at least two hydroxyl groups include, for example, low-molecular-weight compounds such as dihydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, and hexamethylene glycol, trimethylolpropane, glycerin, pentaerythritol, and the like.
- trihydric alcohols, etc., and high-molecular-weight ones include polyether polyols, polyester polyols, acrylic polyols, epoxy polyols, and the like. Among these, polyether polyols are preferred from the viewpoint of the storage stability of the resulting coating composition.
- an alkylene oxide adduct of the low-molecular-weight compound having at least two hydroxyl groups, a ring-opening (co)polymer of alkylene oxide or a cyclic ether (tetrahydrofuran, etc.), or the like can be used.
- Specific examples include polyethylene glycol, polypropylene glycol, ethylene glycol-propylene glycol (block or random) copolymer, polytetramethylene glycol, polyhexamethylene glycol, polyoctamethylene glycol and the like.
- polyethylene glycol, polypropylene glycol, and polytetramethylene glycol can be preferably used as the polyether polyol.
- polyether polyol one type can be used alone, or two or more types can be used in combination.
- examples of the compound having at least two amino groups include polyetheramine.
- the molecular weight of the spacer is preferably in the range of 500 to 6,000, more preferably in the range of 800 to 5,000, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. is more preferable, and more preferably within the range of 1,500 to 3,500.
- the number of functional groups of the spacer is preferably 2 to 3, more preferably 2, from the viewpoint of the storage stability of the resulting coating composition.
- a polyisocyanate compound containing a structure derived from the spacer By reacting some isocyanate groups in the polyisocyanate compound with the spacer, a polyisocyanate compound containing a structure derived from the spacer can be formed.
- the ratio of the polyisocyanate compound to the spacer is based on 1 mol of isocyanate groups in the polyisocyanate compound, and the active hydrogen in the spacer is The number of moles is preferably in the range of 0.03-0.6 moles.
- the blocked polyisocyanate compound contains a blocked polyisocyanate compound having a weight average molecular weight within the range of 20,000 to 200,000 from the viewpoint of the storage stability and popping resistance of the resulting coating composition. is preferred.
- an organometallic compound, an acid compound, a base compound, or the like can optionally be used as a curing catalyst.
- the content of the curing agent (B) is 5 based on the resin solid content in the coating composition, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. It is preferably in the range of 10 to 55% by mass, more preferably in the range of 10 to 50% by mass, and particularly preferably in the range of 15 to 45% by mass.
- Cellulose nanocrystal particles (C) can be obtained by a known method.
- the cellulose nanocrystal particles (C) can be obtained by treating the cellulose raw material with an acid such as sulfuric acid to hydrolyze and remove the amorphous portion, followed by mechanical fibrillation.
- the cellulose raw material is not particularly limited as long as it contains cellulose, but examples include various wood pulps, non-wood pulps, bacterial cellulose, regenerated cellulose, waste paper pulp, cotton, valonia cellulose, sea squirt cellulose, and the like. Various commercially available cellulose powders, microcrystalline cellulose powders, and the like may also be used.
- the mechanical fibrillation treatment is also not particularly limited, and conventionally known methods such as high-pressure homogenizers, ultra-high-pressure homogenizers, ball mills, roll mills, cutter mills, planetary mills, jet mills, attritors, grinders, juicer mixers, and homomixers. , an ultrasonic homogenizer, a nanogenizer, underwater counter-impingement, a method using a single-screw or twin-screw extruder, or the like can be used.
- the cellulose nanocrystal particles (C) can be chemically modified in various ways.
- Types of chemical modification include, for example, carboxymethylation, acylation, esterification such as phosphorylation, oxidation such as carboxylation, sulfonation, fluorination, cationization, and treatment with a silane coupling agent.
- sulfonation is preferable as the type of chemical modification from the viewpoint of the storage stability of the resulting coating composition.
- nanocellulose nanocrystal particles (C) may be chemically modified after being defibrated.
- the cellulose nanocrystal particles (C) may be neutralized with a neutralizing agent.
- a neutralizing agent for example, the neutralizing agent described in the explanation column of the water-dispersible hydroxyl group-containing acrylic resin (A11) can be used.
- the specific surface area of the cellulose nanocrystal particles (C) is preferably in the range of 320 to 500 m 2 /g, preferably 350 to 470 m 2 /g, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. 2 /g, and particularly preferably 370 to 450 m 2 /g.
- the specific surface area means the total surface area (m 2 /g) per 1 g of cellulose nanocrystal particles, and is calculated by measuring the adsorption isotherm of nitrogen gas by the BET method. be.
- the number average diameter of the cellulose nanocrystal particles (C) is preferably within the range of 1 to 5 nm from the viewpoint of the storage stability and popping resistance of the resulting coating composition.
- the number average length of the cellulose nanocrystal particles (C) is preferably in the range of 20 to 500 nm, more preferably 20 to 300 nm, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. is more preferably within the range of , particularly preferably within the range of 25 to 250 nm, and particularly preferably within the range of 30 to 150 nm.
- the above number average diameter and number average fiber length are obtained, for example, by dispersing a sample obtained by diluting the cellulose nanocrystal particles (C) with water, casting it on a hydrophilized carbon film-coated grid, and applying it to the transmission type. It is measured and calculated from an image observed with an electron microscope (TEM). Specifically, the observation field is adjusted so that at least 100 cellulose nanocrystal particles are observed, the diameter and fiber length of 100 randomly selected cellulose nanocrystal particles are measured, and the number average diameter and number Calculate the average fiber length.
- TEM electron microscope
- the ratio of the number average length to the number average diameter of the cellulose nanocrystal particles (C) is 3 from the viewpoint of storage stability and popping resistance of the resulting coating composition. It is preferably 5 or more and less than 50, more preferably 5 or more and less than 50, and particularly preferably 10 or more and less than 50.
- the zeta potential of the cellulose nanocrystal particles (C) is preferably in the range of -50 to -1 mV, more preferably in the range of -45 to -10 mV, and in the range of -42 to -20 mV. is particularly preferred.
- the zeta potential is determined by the following Helmholtz-Smoluchowski formula (1) by measuring the movement speed of particles by electrophoresis.
- Zeta potential ( ⁇ ) ⁇ V/ ⁇ E Equation (1) [ ⁇ : viscosity (poise), V: moving speed (cm/sec), ⁇ : permittivity, E: electric field (V/cm)]
- the zeta potential means a value measured by dynamic light scattering measurement after adding deionized water to cellulose nanocrystal particles and dispersing the mixture with an ultrasonic vibrator for 1 hour.
- "Zetasizer Nano ZS” trade name, manufactured by Malvern Panalytical
- cellulose nanocrystal particles include, for example, "Celluforce NCC” (manufactured by Celluforce, number average diameter 2.3 to 4.5 nm, number average length 44 to 108 nm, specific surface area 400 m 2 /g and a zeta potential of ⁇ 37 mV, sulfonic acid sodium salt type nanocellulose crystal).
- Celluforce NCC manufactured by Celluforce, number average diameter 2.3 to 4.5 nm, number average length 44 to 108 nm, specific surface area 400 m 2 /g and a zeta potential of ⁇ 37 mV, sulfonic acid sodium salt type nanocellulose crystal.
- the content of the cellulose nanocrystal particles (C) is, from the viewpoint of the storage stability and popping resistance of the resulting coating composition, relative to 100 parts by mass of the resin solid content in the coating composition, It is preferably in the range of 0.6 to 7 parts by mass, more preferably in the range of 1.0 to 5.0 parts by mass, and in the range of 1.5 to 4.5 parts by mass. is particularly preferred.
- the coating composition of the present invention further optionally contains a resin other than the hydroxyl-containing resin (A) and the curing agent (B), a pigment, an organic solvent, a curing catalyst, a dispersant, an anti-settling agent, an antifoaming agent, and a viscosity adjusting agent. agents, ultraviolet absorbers, light stabilizers, surface conditioners, and the like.
- resins other than the hydroxyl-containing resin (A) and the curing agent (B) include acrylic resins having no hydroxyl groups, polyester resins having no hydroxyl groups, acrylic-modified polyester resins having no hydroxyl groups, and acrylic-modified resins having no hydroxyl groups.
- examples include polyurethane resins, polyurethane resins having no hydroxyl groups, polyether resins having no hydroxyl groups, polycarbonate resins having no hydroxyl groups, epoxy resins having no hydroxyl groups, alkyd resins having no hydroxyl groups, and polyolefin resins having no hydroxyl groups.
- the coating composition of the present invention preferably contains a polyurethane resin containing no hydroxyl group as at least one of the resins other than the hydroxyl group-containing resin (A) and the curing agent (B).
- the content of the hydroxyl-free polyurethane resin is determined from the viewpoint of the storage stability and popping resistance of the resulting coating composition. It is preferably in the range of 3 to 60% by mass, more preferably in the range of 5 to 40% by mass, and in the range of 7 to 30% by mass, based on the resin solid content in the product. is particularly preferred.
- pigments examples include coloring pigments, extender pigments, luster pigments, and the like.
- the pigments may be used alone or in combination of two or more.
- the amount of the pigment is in the range of 1 to 200 parts by mass based on 100 parts by mass of the resin solid content in the coating composition. It is preferably in the range of 5 to 160 parts by mass, particularly preferably in the range of 5 to 140 parts by mass.
- coloring pigments examples include titanium oxide, zinc oxide, carbon black, molybdenum red, Prussian blue, cobalt blue, azo pigments, phthalocyanine pigments, quinacridone pigments, isoindoline pigments, threne pigments, and perylene pigments. , dioxazine-based pigments, diketopyrrolopyrrole-based pigments, etc. Among them, titanium oxide and carbon black can be preferably used.
- the amount of the coloring pigment is preferably in the range of 1 to 180 parts by mass based on 100 parts by mass of the resin solid content in the coating composition. It is more preferably in the range of 5 to 150 parts by mass, particularly preferably in the range of 15 to 130 parts by mass.
- the extender pigment examples include barium sulfate, talc, clay, kaolin, barium carbonate, calcium carbonate, silica, and alumina white.
- barium sulfate and talc can be preferably used from the viewpoint of paint stability and smoothness.
- the amount of the extender pigment is preferably in the range of 1 to 180 parts by mass based on 100 parts by mass of the resin solid content in the coating composition. It is more preferably within the range of 5 to 140 parts by mass, and particularly preferably within the range of 10 to 120 parts by mass.
- the bright pigment examples include aluminum (including evaporated aluminum), copper, zinc, brass, nickel, glass flakes, aluminum oxide, mica, aluminum oxide coated with titanium oxide and/or iron oxide, oxide Examples include mica coated with titanium and/or iron oxide. Among them, it is preferable.
- Aluminum pigments include non-leafing aluminum pigments, aluminum pigments, and leafing aluminum pigments, any of which can be used.
- the bright pigment is preferably scaly.
- the luster pigment has a longitudinal dimension in the range of 1 to 100 ⁇ m, particularly 5 to 40 ⁇ m, and a thickness in the range of 0.001 to 5 ⁇ m, particularly 0.01 to 2 ⁇ m. one is suitable.
- the amount of the bright pigment is in the range of 0.1 to 100 parts by mass based on 100 parts by mass of the resin solid content in the coating composition. preferably 1 to 50 parts by mass, particularly preferably 3 to 25 parts by mass.
- organic solvent examples include ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; ester solvents such as ethyl acetate, butyl acetate, methyl benzoate, ethyl ethoxypropionate, ethyl propionate, and methyl propionate; and isopropanol.
- ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone
- ester solvents such as ethyl acetate, butyl acetate, methyl benzoate, ethyl ethoxypropionate, ethyl propionate, and methyl propionate
- isopropanol examples of the organic solvent.
- n-butanol isobutanol, 2-ethylhexanol and other alcohol solvents; tetrahydrofuran, dioxane, dimethoxyethane and other ether solvents; ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, propylene glycol monomethyl ether acetate , 3-methoxybutyl acetate, and other glycol ether solvents; aromatic hydrocarbon solvents, aliphatic hydrocarbon solvents, and the like.
- viscosity modifier examples include inorganic viscosity modifiers such as silicates, metal silicates, montmorillonite, and colloidal alumina; copolymers of (meth)acrylic acid and (meth)acrylic acid ester; A polyacrylic acid-based viscosity modifier such as sodium acrylate; having a hydrophilic portion and a hydrophobic portion in one molecule, and in an aqueous medium, the hydrophobic portion adheres to the surface of the pigment and/or emulsion particles in the paint.
- inorganic viscosity modifiers such as silicates, metal silicates, montmorillonite, and colloidal alumina
- copolymers of (meth)acrylic acid and (meth)acrylic acid ester examples include A polyacrylic acid-based viscosity modifier such as sodium acrylate; having a hydrophilic portion and a hydrophobic portion in one molecule, and in an aqueous medium, the hydrophobic portion adheres to the surface of the
- Associative viscosity modifiers exhibiting effective thickening action by adsorption or association of the hydrophobic moieties; Protein-based viscosity modifiers such as casein, sodium caseinate, and ammonium caseinate; Sodium alginate, etc.
- Alginic acid-based viscosity modifier polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl benzyl ether copolymer and other polyvinyl-based viscosity modifiers; Pluronic (registered trademark) polyether, polyether dialkyl ester, polyether dialkyl ether, polyether epoxy modified product maleic anhydride copolymer viscosity modifiers such as vinyl methyl ether-maleic anhydride copolymer partial esters; and polyamide viscosity modifiers such as polyamide amine salts.
- Pluronic (registered trademark) polyether polyether dialkyl ester, polyether dialkyl ether, polyether epoxy modified product maleic anhydride copolymer viscosity modifiers such as vinyl methyl ether-maleic anhydride copolymer partial esters
- polyamide viscosity modifiers such as polyamide amine salts.
- These viscosity modifiers can be used alone or in combination of two or more.
- a polyacrylic acid-based thickener and/or an associative thickener are particularly suitable.
- ultraviolet absorbents include benzotriazole-based absorbents, triazine-based absorbents, salicylic acid derivative-based absorbents, and benzophenone-based absorbents.
- Examples of light stabilizers include hindered amine light stabilizers.
- the coating composition of the present invention has a viscosity (V 1 ) measured at a temperature of 25° C. and a shear rate of 1,500 sec ⁇ 1 within the range of 10 to 70 mPa s, and a temperature of 25° C. and a shear rate of 0
- the viscosity (V 2 ) measured under the condition of .1 sec ⁇ 1 is within the range of 10,000 to 50,000 mPa ⁇ s.
- the viscosity (V 1 ) measured under the conditions of a temperature of 25° C. and a shear rate of 1,500 sec ⁇ 1 and/or the viscosity (V 2 ) measured under the conditions of a temperature of 25° C. and a shear rate of 0.1 sec ⁇ 1 If it is outside the range, the storage stability and/or popping resistance of the resulting coating composition will be low.
- the viscosity (V 1 ) measured under the conditions of a temperature of 25° C. and a shear rate of 1,500 sec ⁇ 1 and the viscosity (V 2 ) measured under the conditions of a temperature of 25° C. and a shear rate of 0.1 sec ⁇ 1 are, for example, It can be measured using a viscoelasticity measuring device such as "HAAKE RheoStress RS150" (trade name, manufactured by HAAKE).
- the viscosity (V 1 ) of the coating composition of the present invention measured under conditions of a temperature of 25° C. and a shear rate of 1,500 sec ⁇ 1 is 20 to 65 mPa from the viewpoint of popping resistance of the resulting coating composition. ⁇ s, more preferably 30 to 60 mPa ⁇ s, and particularly preferably 40 to 55 mPa ⁇ s.
- the viscosity (V 2 ) of the coating composition of the present invention measured under conditions of a temperature of 25° C. and a shear rate of 0.1 sec ⁇ 1 is 12,000 from the viewpoint of the storage stability of the resulting coating composition. It is preferably within the range of ⁇ 40,000 mPa s, more preferably within the range of 15,000 to 35,000 mPa s, and preferably within the range of 20,000 to 30,000 mPa s. Especially preferred.
- the coating solid content concentration of the coating composition of the present invention is preferably in the range of 10 to 45% by mass, from the viewpoint of the storage stability and popping resistance of the resulting coating composition. It is more preferably in the range of 17-30% by mass, and even more preferably in the range of 17-30% by mass.
- the coating composition of the present invention can be prepared by mixing the hydroxyl group-containing resin (A), the curing agent (B), the cellulose nanocrystal particles (C) and optionally other components in a solvent by a conventional means for coating.
- a solvent that can be used include organic solvents and water.
- the paint solid content concentration can be adjusted, for example, by adjusting the amount of the solvent.
- the coating composition of the present invention preferably contains water as a solvent from the viewpoint of storage stability and the like.
- the content of water is in the range of 30 to 80% by mass based on the total amount of the coating composition from the viewpoint of the storage stability of the resulting coating composition. preferably within the range of 40 to 75% by mass, particularly preferably within the range of 50 to 70% by mass.
- the paint composition may be either a one-component paint or a multi-component paint. It is preferably a mold paint.
- the coating composition can be applied to an object to be coated by a method known per se, such as air spray coating, airless spray coating, rotary atomization coating, curtain coating, etc. During coating, static electricity is applied. may Among these, air spray coating and rotary atomization coating are preferred. Moreover, such a coating method can be carried out once or several times until the desired film thickness is obtained.
- the coating amount of the coating composition is such that the cured film thickness is usually 5 to 40 ⁇ m, preferably 7 to 35 ⁇ m, more preferably 10 to 30 ⁇ m. preferable.
- the coating composition of the present invention can be used for forming a base coat film when a multi-layer coating film consisting of a base coat film and a clear coat film is formed on the above-described object to be coated by a two-coat, one-bake method. can be done.
- the coating film formation method in this case can be carried out according to method I below.
- Step (I-1) A step of applying the base coat paint composition (Y) to an object to be coated to form an uncured base coat film
- Step (I-2) A step of applying the clear coat coating composition (Z) onto the uncured base coat coating film to form an uncured clear coat coating film
- Step (I-3) the above A method for forming a multilayer coating film comprising the step of heating an uncured base coat coating film and the uncured clear coat coating film to simultaneously cure both coating films, wherein the base coat coating composition (Y) is A method for forming a multilayer coating film using the coating composition of the present invention.
- the object to be coated in Method I is preferably an automobile body having an undercoat film formed thereon or an automobile body having a colored paint film formed on the undercoat film.
- the undercoat film is preferably formed from an electrodeposition paint, more preferably from a cationic electrodeposition paint.
- the uncured coating film includes a dry-to-touch coating film and a semi-cured dry coating film.
- the coating film thickness is preferably in the range of 0.5 to 50 ⁇ m as a cured film thickness, and 2 to 40 ⁇ m. It is more preferably within the range, particularly preferably within the range of 5 to 30 ⁇ m, and even more preferably within the range of 8 to 27 ⁇ m.
- the uncured base coat coating film is usually formed using one type of base coat coating composition, it can also be formed using two or more types of base coat coating composition.
- the paint composition of the present invention is applied onto the first base coat coat.
- a second base coat paint film can be formed by applying a second base coat paint using the paint composition of .
- the cured film thickness of the first base coating film is preferably within the range of 5 to 15 ⁇ m, more preferably within the range of 7 to 13 ⁇ m. Further preferably, the thickness of the cured film of the second base coat film is preferably in the range of 0.5 to 8 ⁇ m, more preferably in the range of 1 to 8 ⁇ m, and more preferably in the range of 2 to 8 ⁇ m. is particularly preferred.
- the coating film thickness of the clear coating composition (Z) is preferably within the range of 10 to 80 ⁇ m, more preferably within the range of 15 to 60 ⁇ m, as the cured film thickness.
- the coating composition of the present invention after coating the coating composition of the present invention, from the viewpoint of preventing the occurrence of coating film defects such as popping, preheating, air blowing, etc. may be performed under heating conditions in which the coating film is not substantially cured.
- the preheating temperature is preferably in the range of 40 to 100.degree. C., more preferably in the range of 50 to 90.degree. C., and particularly preferably in the range of 60 to 80.degree.
- the preheating time is preferably in the range of 30 seconds to 15 minutes, more preferably in the range of 1 to 10 minutes, particularly preferably in the range of 2 to 5 minutes.
- the air blowing can be carried out, for example, by blowing air heated to room temperature or 25° C. to 80° C.
- an interval of 1 to 60 minutes may optionally be provided at room temperature, or preheating may be performed at 40 to 80° C. for 1 to 60 minutes.
- the coating film can be cured by the above-described known heating means.
- the heating temperature is preferably within the range of 60 to 180°C, more preferably within the range of 65 to 170°C, and particularly preferably within the range of 70 to 160°C.
- the heating time is preferably in the range of 10 to 60 minutes, more preferably in the range of 20 to 40 minutes.
- the coating composition of the present invention is used when a multi-layer coating film comprising a colored coating film, a base coating film and a clear coating film is formed on an object to be coated such as an automobile body by a 3-coat 1-bake method. It can be suitably used for forming a base coat.
- the coating film formation method in this case can be carried out according to the following method II.
- Step (II-1) A step of applying the colored coating composition (X) to the object to be coated to form an uncured colored coating film
- Step (II-2) A step of applying the base coat paint composition (Y) onto the uncured colored paint film to form an uncured base coat paint film
- Step (II-3) A step of applying the clear coat paint composition (Z) onto the uncured base coat paint film to form an uncured clear coat paint film
- Step (II-4) the above A method for forming a multilayer coating film comprising a step of heating an uncured colored coating film, an uncured base coating film and an uncured clear coating film to simultaneously cure them, wherein the base coating composition (Y ) is the coating composition of the present invention.
- the above method II is a method in which the coating film forming method of the method I is performed on an uncured colored coating film.
- the object to be coated in method II is preferably an automobile body having an undercoat film formed thereon.
- the undercoat film is preferably formed from an electrodeposition paint, more preferably from a cationic electrodeposition paint.
- the coating film thickness of the colored coating composition is preferably within the range of 10 to 60 ⁇ m, more preferably within the range of 20 to 40 ⁇ m, in terms of cured film thickness.
- the coating film thickness of the coating composition of the present invention is preferably in the range of 0.5 to 50 ⁇ m, more preferably in the range of 2 to 40 ⁇ m, more preferably in the range of 5 to 30 ⁇ m, as a cured film thickness. It is particularly preferably within the range, more particularly preferably within the range of 8 to 27 ⁇ m.
- the coating film thickness of the clear coat coating composition (Z) is preferably within the range of 10 to 80 ⁇ m, more preferably within the range of 15 to 60 ⁇ m, in terms of cured film thickness.
- the preheating temperature is preferably in the range of 40 to 100.degree. C., more preferably in the range of 50 to 90.degree. C., and particularly preferably in the range of 60 to 80.degree.
- the preheating time is preferably in the range of 30 seconds to 15 minutes, more preferably in the range of 1 to 10 minutes, particularly preferably in the range of 2 to 5 minutes.
- the preheating temperature is preferably in the range of 40 to 100.degree. C., more preferably in the range of 50 to 90.degree. C., and particularly preferably in the range of 60 to 80.degree.
- the preheating time is preferably in the range of 30 seconds to 15 minutes, more preferably in the range of 1 to 10 minutes, particularly preferably in the range of 2 to 5 minutes.
- the uncured base coat coating film is usually formed using one type of base coat paint composition, but it can also be formed using two or more types of base coat paint compositions.
- the coating composition of the present invention can be used as a base coat coating composition that forms at least the base coat coating film of the uppermost layer.
- an interval of 1 to 60 minutes may optionally be provided at room temperature, or preheating may be performed at 40 to 80°C for 1 to 60 minutes.
- Curing of the three-layer coating film of the uncured colored coating film, the uncured base coat coating film, and the uncured clear coat coating film can be performed by the above-described known heating means.
- the heating temperature is preferably within the range of 60 to 180°C, more preferably within the range of 65 to 170°C, and particularly preferably within the range of 70 to 160°C.
- the heating time is preferably in the range of 10 to 60 minutes, particularly preferably in the range of 20 to 40 minutes. By this heating, the three-layer coating film of the colored coating film, the base coating film and the clear coating film can be cured at the same time.
- thermosetting clear coat paint composition for painting automobile bodies and the like
- any known thermosetting clear coat paint composition for painting automobile bodies and the like can be used.
- examples thereof include a base resin having a crosslinkable functional group, an organic solvent type thermosetting coating composition containing a crosslinking agent, an aqueous thermosetting coating composition, a powder thermosetting coating composition, and the like.
- Examples of crosslinkable functional groups possessed by the base resin include carboxyl groups, hydroxyl groups, epoxy groups, and silanol groups.
- Examples of types of base resins include acrylic resins, polyester resins, alkyd resins, urethane resins, epoxy resins, and fluorine resins.
- Examples of cross-linking agents include polyisocyanate compounds, blocked polyisocyanate compounds, melamine resins, urea resins, carboxyl group-containing compounds, carboxyl group-containing resins, epoxy group-containing resins, and epoxy group-containing compounds.
- the clear coat paint may be a one-component paint or a multi-component paint such as a two-component urethane resin paint.
- the clear coat coating composition (Z) may optionally contain coloring pigments, luster pigments, dyes, etc., to such an extent that transparency is not impaired.
- Coloring pigments luster pigments, dyes, etc.
- Light stabilizers, antifoaming agents, viscosity modifiers, rust preventives, surface modifiers and the like can be incorporated as appropriate.
- Combinations of the base resin/crosslinking agent for the clear coat coating composition (Z) include carboxyl group-containing resin/epoxy group-containing resin, hydroxyl group-containing resin/polyisocyanate compound, hydroxyl group-containing resin/blocked polyisocyanate compound, and hydroxyl group-containing resin. / melamine resin and the like are preferable. Among them, a combination of a hydroxyl group-containing resin/polyisocyanate compound is preferable from the viewpoint of graininess of the coating film to be formed.
- thermosetting colored coating composition can be used as the colored coating composition used in Method II.
- a thermosetting coating composition containing a base resin having a crosslinkable functional group, a crosslinker, a color pigment and an extender pigment can be preferably used.
- Examples of crosslinkable functional groups possessed by the base resin include carboxyl groups, hydroxyl groups, and epoxy groups.
- Examples of types of base resins include acrylic resins, polyester resins, alkyd resins, and urethane resins.
- Examples of cross-linking agents include melamine resins, polyisocyanate compounds, blocked polyisocyanate compounds, and the like.
- any of an organic solvent-based coating composition, a coating composition, and a powder coating composition may be used as the colored coating composition. Among these, it is preferable to use the coating composition.
- the coating can be applied by known methods such as air spray coating, airless spray coating, rotary atomization coating, and the like.
- the present invention will be described more specifically with production examples, examples, and comparative examples. However, the present invention is not limited to these. In each example, “parts” and “%” are based on mass unless otherwise specified. Moreover, the film thickness of the coating film is based on the cured coating film.
- Production example 1 for production of hydroxyl group-containing acrylic resin A reaction vessel equipped with a thermometer, a thermostat, a stirrer, a reflux condenser, a nitrogen inlet tube and a dropping device is charged with 130 parts of deionized water and "Aqualon KH-10" (trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., emulsifier , active ingredient 97%) was charged, stirred and mixed in a nitrogen stream, and the temperature was raised to 80°C.
- "Aqualon KH-10" trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., emulsifier , active ingredient 97
- the mixture was discharged while being filtered through a nylon cloth to obtain an aqueous dispersion of a hydroxyl group-containing acrylic resin (A1-1) having a solid concentration of 30%.
- the obtained hydroxyl-containing acrylic resin (A1-1) had an acid value of 16 mgKOH/g, a hydroxyl value of 66 mgKOH/g and a glass transition temperature of 21°C.
- the hydroxyl-containing acrylic resin (A1-1) corresponds to the water-dispersible hydroxyl-containing acrylic resin (A11) having a core/shell type multilayer structure.
- Monomer emulsion (1) 42 parts of deionized water, 0.72 parts of "Aqualon KH-10", 2 parts of methylenebisacrylamide, 5 parts of styrene, 15 parts of methyl methacrylate, 5 parts of 2-hydroxyethyl methacrylate and n-butyl 23 parts of acrylate was mixed and stirred to obtain a monomer emulsion (1).
- Monomer emulsion (2) 42 parts of deionized water, 0.72 parts of "Aqualon KH-10", 0.05 parts of ammonium persulfate, 2.5 parts of methacrylic acid, 10 parts of 2-hydroxyethyl methacrylate, 5 parts of styrene, 12.5 parts of methyl methacrylate, 10 parts of n-butyl acrylate and 10 parts of n-butyl methacrylate were mixed and stirred to obtain a monomer emulsion (2).
- Production example 2 A reaction vessel equipped with a thermometer, a thermostat, a stirrer, a reflux condenser, a nitrogen inlet tube and a dropping device is charged with 130 parts of deionized water and "Aqualon KH-10" (trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., emulsifier , active ingredient 97%) was charged, stirred and mixed in a nitrogen stream, and the temperature was raised to 80°C.
- "Aqualon KH-10" trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., emulsifier , active ingredient 97
- hydroxyl-containing acrylic resin (A1-2) had an acid value of 16 mgKOH/g, a hydroxyl value of 66 mgKOH/g and a glass transition temperature of 21°C.
- the hydroxyl-containing acrylic resin (A1-2) corresponds to the water-dispersible hydroxyl-containing acrylic resin (A11') containing the gradient polymer layer.
- Monomer emulsion (1) 42 parts of deionized water, 0.72 parts of "Aqualon KH-10", 2 parts of methylenebisacrylamide, 5 parts of styrene, 15 parts of methyl methacrylate, 5 parts of 2-hydroxyethyl methacrylate and n-butyl 23 parts of acrylate was mixed and stirred to obtain a monomer emulsion (1).
- Monomer emulsion (2) 42 parts of deionized water, 0.72 parts of "Aqualon KH-10", 0.05 parts of ammonium persulfate, 2.5 parts of methacrylic acid, 10 parts of 2-hydroxyethyl methacrylate, 5 parts of styrene, 12.5 parts of methyl methacrylate, 10 parts of n-butyl acrylate and 10 parts of n-butyl methacrylate were mixed and stirred to obtain a monomer emulsion (2).
- Production example 3 A mixed solvent of 27.5 parts of methoxypropanol and 27.5 parts of isobutanol was placed in a reaction vessel equipped with a thermometer, thermostat, stirrer, reflux condenser and dropping device and heated to 110°C.
- a mixture of 0.5 parts of t-butyl peroxyoctanoate and 20 parts of isopropanol was added dropwise for 1 hour. After that, the mixture was stirred and aged for 1 hour to obtain a hydroxyl group- and phosphoric acid group-containing acrylic resin (A1-3) solution having a solid concentration of 50%.
- the resin had an acid value of 83 mgKOH/g due to phosphate groups, a hydroxyl value of 29 mgKOH/g, and a weight average molecular weight of 10,000.
- Phosphate group-containing polymerizable monomer 57.5 parts of monobutyl phosphate and 41 parts of isobutanol were placed in a reaction vessel equipped with a thermometer, thermostat, stirrer, reflux condenser and dropping device, and the temperature was raised to 90°C. Then, 42.5 parts of glycidyl methacrylate was added dropwise over 2 hours, and the mixture was further stirred and aged for 1 hour. After that, 59 parts of isopropanol was added to obtain a phosphate group-containing polymerizable monomer solution having a solid concentration of 50%. The acid value due to the phosphoric acid group of the obtained monomer was 285 mgKOH/g.
- Production example 4 for production of hydroxyl group-containing polyester resin (A2) 174 parts trimethylolpropane, 327 parts neopentyl glycol, 352 parts adipic acid, 109 parts isophthalic acid and 1,2-cyclohexanedicarbonate were added to a reaction vessel equipped with a thermometer, thermostat, stirrer, reflux condenser and water separator. After charging 101 parts of acid anhydride and raising the temperature from 160° C. to 230° C. over 3 hours, the temperature was maintained at 230° C. while distilling off the generated condensation water with a water separator, and the acid value was 3 mgKOH/g or less.
- Production example 5 for production of hydroxyl group-containing polyurethane resin (A3) In a reaction vessel equipped with a thermometer, a stirrer and a reflux condenser, "PTMG1000” (trade name, manufactured by Mitsubishi Chemical Corporation, polytetramethylene ether glycol having a number average molecular weight of 1000) 316.0 parts, 2,2- Dimethylolpropionic acid 17.0 parts, trimethylolpropane 21.9 parts, isophorone diisocyanate 113.0 parts, "Neostan U-600” (trade name, manufactured by Nitto Kasei Co., Ltd., bismuth-based catalyst) 0.19 parts and methyl ethyl ketone After charging 235.0 parts and purging the reaction system with nitrogen gas, the reaction was allowed to proceed at 80° C.
- PTMG1000 trade name, manufactured by Mitsubishi Chemical Corporation, polytetramethylene ether glycol having a number average molecular weight of 1000
- an NCO-terminated urethane prepolymer having a free isocyanate group content of 3.2% was obtained.
- the obtained methyl ethyl ketone solution was cooled to 40° C., 493.2 g of deionized water containing 9.8 parts of N-ethylmorpholine was added for emulsification, and 159.2 parts of a 5% aqueous ethylenediamine solution was added thereto, After stirring for 60 minutes, methyl ethyl ketone was distilled off under heating under reduced pressure, the concentration was adjusted with deionized water, and a hydroxyl-free polyurethane resin (U-1 ) to obtain a dispersion.
- U-1 hydroxyl-free polyurethane resin
- Production example 10 55.6 parts of the hydroxyl group-containing polyester resin solution (A2-1) obtained in Production Example 4 (25 parts of solid content), 120 parts of "JR-806" (trade name, manufactured by Tayca Co., Ltd., rutile type titanium dioxide) and desorption 10 parts of ionized water was mixed and adjusted to pH 8.0 with 2-(dimethylamino)ethanol. Next, the resulting mixed solution was placed in a wide-mouthed glass bottle, glass beads having a diameter of about 1.3 mm ⁇ were added as dispersion media, the bottle was sealed, and the mixture was dispersed for 30 minutes with a paint shaker to obtain a pigment dispersion (P-3). Obtained.
- JR-806 trade name, manufactured by Tayca Co., Ltd., rutile type titanium dioxide
- cellulose nanocrystal particles (C) aqueous dispersion Production example 11 "Celluforce NCC” (trade name, manufactured by Celluforce, number average diameter 2.3 to 4.5 nm, number average length 44 to 108 nm, a specific surface area of 400 m 2 /g, a zeta potential of ⁇ 37 mV, a sodium sulfonate salt-type nanocellulose crystal, a solid concentration of 100%) was gradually added, and then stirring was continued for 2 hours. An aqueous dispersion of cellulose nanocrystal particles (C-1) was obtained.
- Celluforce NCC trade name, manufactured by Celluforce, number average diameter 2.3 to 4.5 nm, number average length 44 to 108 nm, a specific surface area of 400 m 2 /g, a zeta potential of ⁇ 37 mV, a sodium sulfonate salt-type nanocellulose crystal, a solid concentration of 100%
- each component described in Table 1 is as follows.
- “Rheocrysta I-2SX” trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., cellulose nanofiber, viscosity modifier
- “Primal ASE-60” trade name, manufactured by Dow Chemical Co., Ltd., polyacrylic acid-based viscosity modifier
- (Note 3) “UH-752” trade name, manufactured by ADEKA Corporation, a urethane associative viscosity modifier.
- the coating composition Nos. obtained in Examples 1 to 15 and Comparative Examples 1 to 6 above. 1 to No. 21 was used and evaluated by the following test method. The evaluation results are shown in Table 1 below.
- Electrode GT-10 (trade name, manufactured by Kansai Paint Co., Ltd., a cationic electrodeposition paint ) was electrodeposition coated so as to give a cured film thickness of 20 ⁇ m, and cured by heating at 170° C. for 30 minutes to obtain an electrodeposition coated steel sheet.
- 21 punch holes with a diameter of 5 mm were formed in a line at intervals of 2 cm at a portion of 3 cm from the end of the long side of the obtained electrodeposition coated steel sheet.
- a colored coating composition (trade name “WP-505T” manufactured by Kansai Paint Co., Ltd., a polyester resin/amino resin water-based coating composition) was applied to the electrodeposition coated steel plate provided with punch holes so that the film thickness was 20 ⁇ m. After standing for 2 minutes, preheating was performed at 90° C. for 3 minutes to obtain an uncured colored coating film.
- each coating composition obtained in the above Examples and Comparative Examples was applied onto the uncured colored coating film at 27°C and a relative humidity of 50% using a rotary atomizing electrostatic coating machine. Then, apply a film thickness gradient so that a film thickness of approximately 10 ⁇ m to 50 ⁇ m is obtained in the longitudinal direction, leave for 3 minutes, and then preheat at 90° C.
- Electrodeposition coated so as to give a cured film thickness of 20 ⁇ m, and cured by heating at 170° C. for 30 minutes to obtain an electrodeposition coated steel sheet.
- 21 punch holes with a diameter of 5 mm were formed in a line at intervals of 2 cm at a portion of 3 cm from the end of the long side of the obtained electrodeposition coated steel sheet.
- a colored coating composition (trade name “WP-505T” manufactured by Kansai Paint Co., Ltd., a polyester resin/amino resin water-based coating composition) was applied to the electrodeposition coated steel plate provided with punch holes so that the film thickness was 20 ⁇ m. After standing for 2 minutes, preheating was performed at 80° C. for 3 minutes to obtain an uncured colored coating film. Next, each coating composition obtained in the above Examples and Comparative Examples was applied onto the uncured colored coating film at 27°C and a relative humidity of 50% using a rotary atomizing electrostatic coating machine. Then, apply a film thickness gradient so that a film thickness of approximately 10 ⁇ m to 50 ⁇ m is obtained in the longitudinal direction, leave for 3 minutes, and then preheat at 90° C.
- WP-505T manufactured by Kansai Paint Co., Ltd., a polyester resin/amino resin water-based coating composition
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Abstract
Description
<1>水酸基含有樹脂(A)、硬化剤(B)及びセルロースナノクリスタル粒子(C)を含む塗料組成物であって、温度25℃及びせん断速度1,500sec-1の条件下で測定した粘度(V1)が10~70mPa・sの範囲内であり、かつ温度25℃及びせん断速度0.1sec-1の条件下で測定した粘度(V2)が10,000~50,000mPa・sの範囲内である、塗料組成物。
<2>前記セルロースナノクリスタル粒子(C)がスルホン酸基を有する、<1>に記載の塗料組成物。
<3>前記セルロースナノクリスタル粒子(C)の数平均直径が1~5nmの範囲内であり、かつ比表面積が320~500m2/gの範囲内である、<1>又は<2>に記載の塗料組成物。
<4>前記セルロースナノクリスタル粒子(C)の数平均長さが20~500nmの範囲内である、<1>~<3>のいずれか1つに記載の塗料組成物。
<5>前記セルロースナノクリスタル粒子(C)のゼータ電位が-50~-1mVの範囲内である、<1>~<4>のいずれか1つに記載の塗料組成物。
<6>さらに水を含む、<1>~<5>のいずれか1つに記載の塗料組成物。
<7>前記水の含有量が、塗料組成物の総量を基準として、30~80質量%の範囲内である、<6>に記載の塗料組成物。
<8>前記水酸基含有樹脂(A)が、重合性不飽和基を1分子中に少なくとも2個有する重合性不飽和モノマー(c)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(d)を共重合することにより得られる共重合体(I)のコアと、水酸基含有重合性不飽和モノマー(a)及び水酸基含有重合性不飽和モノマー(a)以外の重合性不飽和モノマー(b)を共重合することにより得られる共重合体(II)のシェルを構成成分とするコア/シェル型複層構造を有する水分散性水酸基含有アクリル樹脂(A11)を含む、<6>又は<7>に記載の塗料組成物。
<9>塗料固形分濃度が10~45質量%の範囲内である、<1>~<8>のいずれか1つに記載の塗料組成物。
<10>工程(I-1):被塗物に、ベースコート塗料組成物(Y)を塗装して未硬化のベースコート塗膜を形成する工程、
工程(I-2):前記未硬化のベースコート塗膜上にクリヤーコート塗料組成物(Z)を塗装して未硬化のクリヤーコート塗膜を形成する工程、並びに
工程(I-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コート塗膜を加熱して、両塗膜を同時に硬化させる工程を含む複層塗膜形成方法であって、
前記ベースコート塗料組成物(Y)が<1>~<9>のいずれか1つに記載の塗料組成物である複層塗膜形成方法。
<11>工程(II-1):被塗物に、着色塗料組成物(X)を塗装して未硬化の着色塗膜を形成する工程、
工程(II-2):前記未硬化の着色塗膜上に、ベースコート塗料組成物(Y)を塗装して未硬化のベースコート塗膜を形成する工程、
工程(II-3):前記未硬化のベースコート塗膜上に、クリヤーコート塗料組成物(Z)を塗装して未硬化のクリヤーコート塗膜を形成する工程、並びに
工程(II-4):前記未硬化の着色塗膜、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コート塗膜を加熱して、同時に硬化させる工程を含む複層塗膜形成方法であって、
前記ベースコート塗料組成物(Y)が請求項<1>~<9>のいずれか1つに記載の塗料組成物である複層塗膜形成方法。
水酸基含有樹脂(A)は、1分子中に少なくとも1個の水酸基を有する樹脂である。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)、水酸基含有アクリル変性ポリエステル樹脂、水酸基含有ポリエーテル樹脂、水酸基含有ポリカーボネート樹脂、水酸基含有エポキシ樹脂、水酸基含有アルキド樹脂等の樹脂が挙げられる。これらはそれぞれ単独でもしくは2種以上組み合わせて使用することができる。
水酸基含有アクリル樹脂(A1)は、通常、水酸基含有重合性不飽和モノマー(a)及び該水酸基含有重合性不飽和モノマー(a)と共重合可能な他の重合性不飽和モノマー(b)を、例えば、有機溶媒中での溶液重合法、水性媒体中でのエマルション重合法等のそれ自体既知の方法によって共重合させることにより製造することができる。
(i)アルキル又はシクロアルキル(メタ)アクリレート: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、ドデシル(メタ)アクリレート、トリデシル(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。
(ii)イソボルニル基を有する重合性不飽和モノマー:例えば、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:例えば、アダマンチル(メタ)アクリレート等。
(iv)トリシクロデセニル基を有する重合性不飽和モノマー:例えば、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:例えば、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:例えば、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。
(vii)フッ素化アルキル基を有する重合性不飽和モノマー:例えば、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:例えば、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。
(x)カルボキシル基含有重合性不飽和モノマー:例えば、(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:例えば、(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、2-(メタクリロイルオキシ)エチルトリメチルアンモニウムクロライド、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。
(xii)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:例えば、アリル(メタ)アクリレート、エチレングリコ-ルジ(メタ)アクリレ-ト、1,4-ブタンジオールジ(メタ)アクリレート、ネオペンチルグリコールジ(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:例えば、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。
(xiv)分子末端にアルコキシ基を有するポリオキシエチレン鎖を有する(メタ)アクリレート。
(xv)スルホン酸基を有する重合性不飽和モノマー:例えば、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、アンモニウム塩等。
(xvi)リン酸基を有する重合性不飽和モノマー: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。
(xvii)紫外線吸収性官能基を有する重合性不飽和モノマー:例えば、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。
(xviii)光安定性重合性不飽和モノマー:例えば、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。
(xix)カルボニル基を有する重合性不飽和モノマー:例えば、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、4~7個の炭素原子を有する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。
1/Tg(K)=W1/T1+W2/T2+・・・Wn/Tn
Tg(℃)=Tg(K)-273
式中、W1、W2、・・・Wnは各モノマーの質量分率であり、T1、T2・・・Tnは各モノマーのホモポリマーのガラス転移温度Tg(K)である。
なお、各モノマーのホモポリマーのガラス転移温度は、POLYMER HANDBOOK Fourth Edition,J.Brandrup,E.h.Immergut,E.A.Grulke編(1999年)による値であり、該文献に記載されていないモノマーのガラス転移温度は、該モノマーのホモポリマーを重量平均分子量が50,000程度になるようにして合成し、そのガラス転移温度を示差走査型熱分析により測定したときの値を使用する。
前記水酸基含有ポリエステル樹脂(A2)は、例えば、アルコール成分として2個以上の水酸基を有するポリオールを使用し、酸成分として2個以上のカルボキシル基を有するポリカルボン酸を使用し、該アルコール成分及び酸成分を縮合させることによって得ることができる。
前記水酸基含有ポリウレタン樹脂(A3)としては、ポリオールとポリイソシアネートとを反応させることにより得られる水酸基含有ポリウレタン樹脂を挙げることができる。
硬化剤(B)は特に制限されるものではない。例えば、水酸基含有樹脂(B)の水酸基との反応性を有する架橋剤を使用することができる。
上記アミノ樹脂(B1)としては、アミノ成分とアルデヒド成分との反応によって得られる部分メチロール化アミノ樹脂又は完全メチロール化アミノ樹脂を使用することができる。アミノ成分としては、例えば、メラミン、尿素、ベンゾグアナミン、アセトグアナミン、ステログアナミン、スピログアナミン、ジシアンジアミド等が挙げられる。アルデヒド成分としては、例えば、ホルムアルデヒド、パラホルムアルデヒド、アセトアルデヒド、ベンズアルデヒド等が挙げられる。
前記ポリイソシアネート化合物(B2)は、1分子中に2個以上のイソシアネート基を有する化合物である。
前記ブロック化ポリイソシアネート化合物(B3)は、前記ポリイソシアネート化合物(B2)のイソシアネート基を、ブロック剤でブロックした化合物である。
セルロースナノクリスタル粒子(C)は公知の方法によって得ることができる。例えば、セルロース原料を硫酸等の酸によって処理することによって非結晶部分を加水分解して取り除き、次いで、機械的解繊処理することによりセルロースナノクリスタル粒子(C)を得ることができる。
〔η:粘度(ポイズ)、V:移動速度(cm/sec)、ε:誘電率、E:電場(V/cm)〕
本明細書では、ゼータ電位は、セルロースナノクリスタル粒子に、脱イオン水を添加し、超音波振動器で1時間分散させ、動的光散乱測定法により測定された値を意味する。上記ゼータ電位の測定には、例えば、「ゼータサイザーナノ ZS」(商品名、マルバーン・パナリティカル社製)を用いることができる。
本発明の塗料組成物は、さらに任意選択で、水酸基含有樹脂(A)及び硬化剤(B)以外の樹脂、顔料、有機溶剤、硬化触媒、分散剤、沈降防止剤、消泡剤、粘性調整剤、紫外線吸収剤、光安定剤、表面調整剤等を含有することができる。
紫外線吸収剤としては、例えば、ベンゾトリアゾール系吸収剤、トリアジン系吸収剤、サリチル酸誘導体系吸収剤、ベンゾフェノン系吸収剤等を挙げることができる。
本発明の塗料組成物は、温度25℃及び剪断速度1,500sec-1の条件下で測定した粘度(V1)が10~70mPa・sの範囲内であり、かつ温度25℃及びせん断速度0.1sec-1の条件下で測定した粘度(V2)が10,000~50,000mPa・sの範囲内である。上記温度25℃及び剪断速度1,500sec-1の条件下で測定した粘度(V1)及び/又は温度25℃及びせん断速度0.1sec-1の条件下で測定した粘度(V2)が上記範囲外であると、得られる塗料組成物の貯蔵安定性及び/又は耐ワキ性が低くなる。
本発明の塗料組成物は、ベースコート塗膜及びクリヤーコート塗膜からなる複層塗膜を、2コート1ベーク方式で前述の被塗物に形成する場合に、該ベースコート塗膜形成用として用いることができる。この場合の塗膜形成方法は、下記方法Iに従って、行うことができる。
工程(I-1):被塗物に、ベースコート塗料組成物(Y)を塗装して未硬化のベースコート塗膜を形成する工程、
工程(I-2):前記未硬化のベースコート塗膜上に、クリヤーコート塗料組成物(Z)を塗装して未硬化のクリヤーコート塗膜を形成する工程、並びに
工程(I-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コート塗膜を加熱して、両塗膜を同時に硬化させる工程、を含む複層塗膜形成方法であって、該ベースコート塗料組成物(Y)が本発明の塗料組成物である複層塗膜形成方法。
工程(II-1):被塗物に、着色塗料組成物(X)を塗装して未硬化の着色塗膜を形成する工程、
工程(II-2):前記未硬化の着色塗膜上に、ベースコート塗料組成物(Y)を塗装して未硬化のベースコート塗膜を形成する工程、
工程(II-3):前記未硬化のベースコート塗膜上に、クリヤーコート塗料組成物(Z)を塗装して未硬化のクリヤーコート塗膜を形成する工程、並びに
工程(II-4):前記未硬化の着色塗膜、未硬化のベースコート塗膜及び未硬化のクリヤーコート塗膜を加熱して、同時に硬化させる工程、を含む複層塗膜形成方法であって、該ベースコート塗料組成物(Y)が本発明の塗料組成物である複層塗膜形成方法。
製造例1
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、脱イオン水130部及び「アクアロンKH-10」(商品名、第一工業製薬株式会社製、乳化剤、有効成分97%)0.52部を仕込み、窒素気流中で撹拌混合し、80℃に昇温した。
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、脱イオン水130部及び「アクアロンKH-10」(商品名、第一工業製薬株式会社製、乳化剤、有効成分97%)0.52部を仕込み、窒素気流中で撹拌混合し、80℃に昇温した。
温度計、サーモスタット、撹拌器、還流冷却器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部の混合溶剤を入れ、110℃に加熱した。次いで、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、大阪有機化学工業株式会社製、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、下記リン酸基含有重合性モノマー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t-ブチルパーオキシオクタノエート4部からなる混合物121.5部を、4時間かけて上記混合溶剤に加え、さらにt-ブチルパーオキシオクタノエート0.5部とイソプロパノール20部からなる混合物を1時間滴下した。その後、1時間攪拌熟成して固形分濃度50%の水酸基及びリン酸基含有アクリル樹脂(A1-3)溶液を得た。本樹脂のリン酸基による酸価は83mgKOH/g、水酸基価は29mgKOH/g、重量平均分子量は10,000であった。
製造例4
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174部、ネオペンチルグリコール327部、アジピン酸352部、イソフタル酸109部及び1,2-シクロヘキサンジカルボン酸無水物101部を仕込み、160℃から230℃まで3時間かけて昇温させた後、生成した縮合水を水分離器により留去させながら230℃で保持し、酸価が3mgKOH/g以下となるまで反応させた。この反応生成物に、無水トリメリット酸59部を添加し、170℃で30分間付加反応を行った後、50℃以下に冷却し、N-メチルモルホリンを酸基に対して当量添加し中和してから、脱イオン水を徐々に添加することにより、固形分濃度45%、pH7.2の水酸基含有ポリエステル樹脂(A2-1)溶液を得た。得られた水酸基含有ポリエステル樹脂は、水酸基価が128mgKOH/g、酸価が35mgKOH/g、重量平均分子量が13,000であった。
製造例5
温度計、撹拌機及び還流コンデンサーを備えた反応槽に、「PTMG1000」(商品名、三菱ケミカル株式会社製、数平均分子量が1000であるポリテトラメチレンエーテルグリコール)316.0部、2,2-ジメチロールプロピオン酸17.0部、トリメチロールプロパン21.9部、イソホロンジイソシアネート113.0部、「ネオスタン U-600」(商品名、日東化成株式会社製、ビスマス系触媒)0.19部及びメチルエチルケトン235.0部を仕込み、反応系を窒素ガスで置換した後、撹拌下80℃で反応させ遊離イソシアネート基含有量3.2%のNCO末端ウレタンプレポリマーを得た。得られた該メチルエチルケトン溶液を40℃に冷却し、N-メチルモルホリン13.8部を含む脱イオン水764.5gを加えて乳化した後、これに5%N-(2-ヒドロキシエチル)エチレンジアミン水溶液96.4部を添加し、120分間撹拌後、メチルエチルケトンを減圧加熱下に留去し、脱イオン水で濃度調整して、固形分濃度35%、酸価15mgKOH/g、水酸基価12mgKOH/g、平均粒子径120nm、ガラス転移温度-7℃の水酸基含有ポリウレタン樹脂(A3-1)分散液を得た。
製造例6
温度計、撹拌機及び還流コンデンサーを備えた反応槽に、「PTMG1000」(商品名、三菱ケミカル株式会社製、数平均分子量が1000であるポリテトラメチレンエーテルグリコール)211.9部、2,2-ジメチロールプロピオン酸11.5部、トリメチロールプロパン6.9部、イソホロンジイソシアネート112.2部及びメチルエチルケトン298.5部を仕込み、反応系を窒素ガスで置換した後、撹拌下80℃で反応させて、遊離イソシアネート基含有量3.2%のNCO末端ウレタンプレポリマーを得た。得られた該メチルエチルケトン溶液を40℃に冷却し、N-エチルモルホリン9.8部を含む脱イオン水493.2gを加えて乳化した後、これに5%エチレンジアミン水溶液159.2部を添加し、60分間撹拌後、メチルエチルケトンを減圧加熱下に留去し、脱イオン水で濃度調整して、固形分35%、酸価14mgKOH/g、平均粒子径120nmの水酸基を含有しないポリウレタン樹脂(U-1)分散液を得た。
製造例7
温度計、サーモスタット、攪拌装置、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、「スミジュールN-3300」(商品名、住化バイエルウレタン株式会社製、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、固形分濃度100%、イソシアネート基含有率21.8%)1650部、「PTMG2000」(商品名、三菱ケミカル株式会社製、ポリテトラメチレンエーテルグリコール、平均分子量2,000、固形分濃度100%)1100部及び2,6-ジ-t-ブチル-4-メチルフェノール0.9部を仕込み、よく混合して、窒素気流下で、130℃で3時間加熱した。次いで、酢酸エチル1200部及びマロン酸ジイソプロピル1200部を仕込み、窒素気流下で攪拌しながら、ナトリウムメトキシドの28%メタノール溶液14部を加え、65℃で8時間攪拌した。次いで、最終固形分濃度が70%となるよう酢酸エチルで希釈して、固形分濃度70%、重量平均分子量40,000のブロック化ポリイソシアネート化合物(B3-1)を得た。
製造例8
撹拌混合容器内において、「アルペースト 6360NS」(商品名、東洋アルミニウム株式会社製、アルミニウム顔料ペースト、アルミニウム含有量70%)21.4部(固形分15部)、製造例3で得た水酸基及びリン酸基を有するアクリル樹脂(A1-3)溶液10部(固形分5部)及びエチレングルコールモノブチルエーテル35部を均一に混合して、顔料分散液(P-1)を得た。
撹拌混合容器内において、「アルペースト 6360NS」(商品名、東洋アルミニウム株式会社製、アルミニウム顔料ペースト、アルミニウム含有量70%)21.4部(固形分15部)、製造例3で得た水酸基及びリン酸基を有するアクリル樹脂(A1-3)溶液10部(固形分5部)及び2-エチルヘキサノール35部を均一に混合して、顔料分散液(P-2)を得た。
製造例4で得た水酸基含有ポリエステル樹脂溶液(A2-1)55.6部(固形分25部)、「JR-806」(商品名、テイカ株式会社製、ルチル型二酸化チタン)120部及び脱イオン水10部を混合し、2-(ジメチルアミノ)エタノールでpH8.0に調整した。次いで、得られた混合液を広口ガラスビン中に入れ、分散メジアとして直径約1.3mmφのガラスビーズを加えて密封し、ペイントシェイカーにて30分間分散して、顔料分散液(P-3)を得た。
製造例11
マグネチックスターラーで攪拌した脱イオン水に対し、固形分濃度4%となるように「Celluforce NCC」(商品名、Celluforce社製、数平均直径が2.3~4.5nm、数平均長さが44~108nm、比表面積が400m2/g、ゼータ電位が-37mVである、スルホン酸ナトリウム塩型ナノセルロースクリスタル、固形分濃度100%)を徐々に添加後、2時間攪拌を継続することで、セルロースナノクリスタル粒子(C-1)水分散液を得た。
実施例1
撹拌混合容器に、製造例8で得た顔料分散液(P-1)66.4部(固形分20.0部)、エチレングリコールモノブチルエーテル5.0部、製造例1で得水酸基含有アクリル樹脂(A1-1)水分散液133.3部(固形分40.0部)、製造例4で得た水酸基含有ポリエステル樹脂溶液(A2-1)55.6部(固形分25部)、製造例6で得た水酸基を含有しないポリウレタン樹脂(U-1)28.6部(固形分10部)、「サイメル325」(商品名、オルネクスジャパン株式会社製、メチル/ブチル混合エーテル化メラミン樹脂、固形分濃度80%)6.25部(固形分5.0部)及び「バイヒジュールVPLS2310」(商品名、住化バイエルウレタン株式会社製、ブロック化ポリイソシアネート化合物、固形分濃度38%)39.5部(固形分15.0部)を均一に混合し、更に、製造例11で得たセルロースナノクリスタル粒子(C-1)水分散液75.0部(固形分3.0部)、2-(ジメチルアミノ)エタノール及び脱イオン水を加えてpH8.0、塗料固形分濃度25%の塗料組成物No.1を得た。
実施例1において、配合組成を下記表1に示すものとする以外は、実施例1と同様にして、塗料組成物No.2~No.21を得た。
(注1)「レオクリスタ I-2SX」:商品名、第一工業製薬株式会社製、セルロースナノファイバー、粘性調整剤、
(注2)「プライマル ASE-60」:商品名、ダウケミカル株式会社製、ポリアクリル酸系粘性調整剤、
(注3)「UH-752」:商品名、株式会社ADEKA製、ウレタン会合型粘性調整剤。
貯蔵安定性
上記実施例及び比較例で得られた各塗料組成物について、下記試験方法に従って、貯蔵安定性試験を行った。
上記各塗料組成物を容量が約1Lのガラス瓶に800g入れ、40℃の恒温室中で10日間貯蔵した。その後、室温に戻し、容器の中の状態を目視にて観察し、以下の基準で貯蔵安定性の評価を行った。A及びBが合格である。結果を表1に示す。
A:沈降物の発生及び粘度変化が全く認められない。
B:沈降物の発生及び/又は粘度変化が僅かに認められるが撹拌により元に戻る。
C:沈降物の発生及び/又は粘度変化が認められる。
D:沈降物の著しい発生及び/又は著しい粘度変化が認められる。
11cm×45cmの大きさとしたリン酸亜鉛化成処理を施した冷延鋼板に、「エレクロンGT-10」(商品名、関西ペイント株式会社製、カチオン電着塗料)を硬化膜厚20μmとなるように電着塗装し、170℃で30分間加熱して硬化させて電着塗装鋼板を得た。次いで、得られた電着塗装鋼板の長尺側の端部から3cmの部分に、直径5mmのポンチ孔を、2cm間隔で21個一列状に設けた。次いで、ポンチ孔を設けた電着塗装鋼板上に着色塗料組成物(商品名「WP-505T」、関西ペイント株式会社製、ポリエステル樹脂・アミノ樹脂系水性塗料組成物)を膜厚20μmになるように塗装し、2分間放置後、90℃で3分間プレヒートを行なって、未硬化の着色塗膜を得た。次いで、該未硬化の着色塗膜上に、上記実施例及び比較例で得られた各塗料組成物を、27℃、相対湿度50%の条件下で回転霧化型の静電塗装機を用いて、長尺方向にほぼ10μm~50μmの膜厚が得られるように膜厚勾配をつけて塗装し、3分間放置後、90℃で3分間プレヒートを行なって、未硬化のベースコート塗膜を得た。次いで、該未硬化のベースコート塗膜上に、「KINO6510」(商品名、関西ペイント株式会社製、アクリル樹脂・ポリイソシアネート化合物系溶剤型上塗りクリヤーコート塗料)を硬化膜厚35μmとなるように静電塗装して、未硬化のクリヤーコート塗膜を得た。次いで、7分間放置した後、80℃で30分間加熱して、上記未硬化の着色塗膜、未硬化のベースコート塗膜及び未硬化のクリヤーコート塗膜からなる複層塗膜を硬化させることにより各耐ワキ性評価用塗装板を作製した。
得られた各ワキ性評価用塗装板のワキが観察される位置を調べ、該位置の膜厚[ワキ限界膜厚(μm)]を測定し、以下の基準で耐ワキ性の評価を行なった。ワキ限界膜厚が大きいほど耐ワキ性は良好であり、A及びBが合格である。結果を表1に示す。
A:ワキ限界膜厚が35μm以上。
B:ワキ限界膜厚が30μm以上35μm未満。
D:ワキ限界膜厚が30μm未満。
11cm×45cmの大きさとしたリン酸亜鉛化成処理を施した冷延鋼板に、「エレクロンGT-10」(商品名、関西ペイント株式会社製、カチオン電着塗料)を硬化膜厚20μmとなるように電着塗装し、170℃で30分間加熱して硬化させて電着塗装鋼板を得た。次いで、得られた電着塗装鋼板の長尺側の端部から3cmの部分に、直径5mmのポンチ孔を、2cm間隔で21個一列状に設けた。次いで、ポンチ孔を設けた電着塗装鋼板上に着色塗料組成物(商品名「WP-505T」、関西ペイント株式会社製、ポリエステル樹脂・アミノ樹脂系水性塗料組成物)を膜厚20μmになるように塗装し、2分間放置後、80℃で3分間プレヒートを行なって、未硬化の着色塗膜を得た。次いで、該未硬化の着色塗膜上に、上記実施例及び比較例で得られた各塗料組成物を、27℃、相対湿度50%の条件下で回転霧化型の静電塗装機を用いて、長尺方向にほぼ10μm~50μmの膜厚が得られるように膜厚勾配をつけて塗装し、3分間放置後、90℃で3分間プレヒートを行なって、未硬化のベースコート塗膜を得た。次いで、該未硬化のベースコート塗膜上に、「KINO6510」(商品名、関西ペイント株式会社製、アクリル樹脂・ポリイソシアネート化合物系溶剤型上塗りクリヤーコート塗料)を硬化膜厚35μmとなるように静電塗装して、未硬化のクリヤーコート塗膜を得た。次いで、7分間放置した後、140℃で30分間加熱して、上記未硬化の着色塗膜、未硬化のベースコート塗膜及び未硬化のクリヤーコート塗膜からなる複層塗膜を硬化させることにより各耐ワキ性評価用塗装板を作製した。
A:ワキ限界膜厚が35μm以上。
B:ワキ限界膜厚が30μm以上35μm未満。
D:ワキ限界膜厚が30μm未満。
Claims (11)
- 水酸基含有樹脂(A)、硬化剤(B)及びセルロースナノクリスタル粒子(C)を含む塗料組成物であって、温度25℃及びせん断速度1,500sec-1の条件下で測定した粘度(V1)が10~70mPa・sの範囲内であり、かつ温度25℃及びせん断速度0.1sec-1の条件下で測定した粘度(V2)が10,000~50,000mPa・sの範囲内である、塗料組成物。
- 前記セルロースナノクリスタル粒子(C)がスルホン酸基を有する、請求項1に記載の塗料組成物。
- 前記セルロースナノクリスタル粒子(C)の数平均直径が1~5nmの範囲内であり、かつ比表面積が320~500m2/gの範囲内である、請求項1又は2に記載の塗料組成物。
- 前記セルロースナノクリスタル粒子(C)の数平均長さが20~500nmの範囲内である、請求項1~3のいずれか1項に記載の塗料組成物。
- 前記セルロースナノクリスタル粒子(C)のゼータ電位が-50~-1mVの範囲内である、請求項1~4のいずれか1項に記載の塗料組成物。
- さらに水を含む、請求項1~5のいずれか1項に記載の塗料組成物。
- 前記水の含有量が、塗料組成物の総量を基準として、30~80質量%の範囲内である、請求項6に記載の塗料組成物。
- 前記水酸基含有樹脂(A)が、重合性不飽和基を1分子中に少なくとも2個有する重合性不飽和モノマー(c)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(d)を共重合することにより得られる共重合体(I)のコアと、水酸基含有重合性不飽和モノマー(a)及び水酸基含有重合性不飽和モノマー(a)以外の重合性不飽和モノマー(b)を共重合することにより得られる共重合体(II)のシェルを構成成分とするコア/シェル型複層構造を有する水分散性水酸基含有アクリル樹脂(A11)を含む、請求項6又は7に記載の塗料組成物。
- 塗料固形分濃度が10~45質量%の範囲内である、請求項1~8のいずれか1項に記載の塗料組成物。
- 工程(I-1):被塗物に、ベースコート塗料組成物(Y)を塗装して未硬化のベースコート塗膜を形成する工程、
工程(I-2):前記未硬化のベースコート塗膜上にクリヤーコート塗料組成物(Z)を塗装して未硬化のクリヤーコート塗膜を形成する工程、並びに
工程(I-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コート塗膜を加熱して、両塗膜を同時に硬化させる工程を含む複層塗膜形成方法であって、
前記ベースコート塗料組成物(Y)が請求項1~9のいずれか1項に記載の塗料組成物である複層塗膜形成方法。 - 工程(II-1):被塗物に、着色塗料組成物(X)を塗装して未硬化の着色塗膜を形成する工程、
工程(II-2):前記未硬化の着色塗膜上に、ベースコート塗料組成物(Y)を塗装して未硬化のベースコート塗膜を形成する工程、
工程(II-3):前記未硬化のベースコート塗膜上に、クリヤーコート塗料組成物(Z)を塗装して未硬化のクリヤーコート塗膜を形成する工程、並びに
工程(II-4):前記未硬化の着色塗膜、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コート塗膜を加熱して、同時に硬化させる工程を含む複層塗膜形成方法であって、
前記ベースコート塗料組成物(Y)が請求項1~9のいずれか1項に記載の塗料組成物である複層塗膜形成方法。
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