WO2015002299A1 - 塗料組成物及び塗膜形成方法 - Google Patents
塗料組成物及び塗膜形成方法 Download PDFInfo
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- WO2015002299A1 WO2015002299A1 PCT/JP2014/067925 JP2014067925W WO2015002299A1 WO 2015002299 A1 WO2015002299 A1 WO 2015002299A1 JP 2014067925 W JP2014067925 W JP 2014067925W WO 2015002299 A1 WO2015002299 A1 WO 2015002299A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/53—Base coat plus clear coat type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/57—Three layers or more the last layer being a clear coat
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/10—Homopolymers or copolymers of methacrylic acid esters
- C09D133/12—Homopolymers or copolymers of methyl methacrylate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D201/00—Coating compositions based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/67—Particle size smaller than 100 nm
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
Definitions
- the present invention provides a coating composition capable of forming a coating film having high brightness and low ultraviolet transmittance at a wavelength of 420 to 480 nm, and a color base coating on a coating film obtained by coating the coating composition on an object to be coated.
- the present invention relates to a coating film forming method for laminating films.
- the products may be painted for the purpose of protecting the products and imparting cosmetics.
- the object to be coated is a plastic material
- cosmetics may be provided. Even in such a case, it is necessary to devise a method for preventing ultraviolet rays from reaching the surface of the coating film made of the anticorrosive paint.
- Patent Document 1 discloses that on a substrate provided with an EDC primer, a coating layer having a thickness of 8 to 20 ⁇ m from the aqueous coating composition A, a base coat layer having a thickness of 5 to 15 ⁇ m from the aqueous coating composition B, And a method for producing a multi-layer coating comprising applying a clear coat layer and curing the three coating layers together.
- the coating compositions A and B are different from each other, and the coating composition A contains 0.06: 1 to 0.001 at least one metal platelet pigment having a thickness of 10 to 100 nm.
- the coating composition A contains 0.06: 1 to 0.001 at least one metal platelet pigment having a thickness of 10 to 100 nm.
- it is contained in a ratio corresponding to a 2: 1 pigment / resin solids weight ratio, and there is a problem that it cannot be applied to all color gamuts.
- An object of the present invention is to provide a coating composition capable of forming a coating film having high brightness and low ultraviolet transmittance at a wavelength of 420 to 480 nm, and a coating film obtained by coating the coating composition on an object to be coated, It is providing the coating-film formation method which laminates
- the present invention 1.
- a coating composition comprising a chlorine-based titanium oxide pigment, a yellow iron oxide pigment, a carbon black pigment having a primary average particle size in the range of 15 to 80 nm, and a resin composition as a vehicle-forming component, the coating composition comprising: A coating composition in which the average value of light transmittance at a wavelength of 420 nm to 480 nm of a coating film obtained by coating to be 25 ⁇ m as a cured coating film is in the range of 0.1 to 1.0%; 2.
- the L * value in the L * a * b * color system of the coating film obtained by coating to be 25 ⁇ m as a cured coating film is in the range of 80 to 95, and the a * value is ⁇ 2.0 to 2.
- the color base coating film includes a coating film obtained by applying a metallic paint composition containing a scaly glittering pigment, and a coating film obtained by applying a top clear paint. Regarding the method.
- a coating composition capable of forming a coating film having high brightness and low ultraviolet transmittance at a wavelength of 420 to 480 nm, and a coating film obtained by coating the coating composition on an object to be coated, A coating film forming method for laminating a color base coating film can be obtained.
- the coating composition of the present invention contains a chlorine-based titanium oxide pigment for the purpose of concealing the object to be coated.
- the chlorinated titanium oxide pigment is an industrially produced titanium oxide pigment that is produced in the following steps.
- a raw material natural titanium or synthetic titanium is used. Coke is added to the raw material and reacted with chlorine gas at a high temperature to produce crude TiCl 4 .
- the produced crude TiCl 4 is rectified at a temperature of 136 ° C. or higher after removing solid impurities.
- the purified high-purity TiCl 4 is heated to about 1000 ° C. and reacted with oxygen to produce titanium oxide particles.
- the obtained titanium oxide particles are pulverized, sized, surface-treated, washed, dried, and finish-pulverized to produce a titanium oxide pigment that can be used as a coating material.
- the chlorine-based titanium oxide pigment in the present invention may be surface-treated with an oxide or hydroxide such as silica, alumina, zirconia, or the like, or an organic typified by polydimethylsiloxane, from the viewpoint of improving the weather resistance. It may be surface-treated with a silicon compound or a higher fatty acid typified by stearic acid or an organic titanium compound typified by isopropyl triisostearoyl titanate.
- an oxide or hydroxide such as silica, alumina, zirconia, or the like
- an organic typified by polydimethylsiloxane from the viewpoint of improving the weather resistance.
- It may be surface-treated with a silicon compound or a higher fatty acid typified by stearic acid or an organic titanium compound typified by isopropyl triisostearoyl titanate.
- the chlorine-based titanium oxide pigment in the present invention is preferably used in the range of an average particle size of 200 nm to 700 nm, more preferably an average particle size, from the viewpoint of coloring power and finish of a coating film obtained by coating. It is in the range of 300 nm to 500 nm.
- the average particle diameter of the titanium oxide pigment is an average particle diameter measured by observation with an electron microscope. Since the titanium oxide pigment is substantially spherical, the diameter is measured. Specifically, 100 particles can be selected from the transmission electron microscope image, and the average particle size can be determined using NIH® Image® 1.63, a free software manufactured by NIH (National Institute of Health).
- the content of the chlorine-based titanium oxide pigment in the coating composition of the present invention is based on the resin composition 100 solid mass part, which is a vehicle-forming component described later, from the viewpoint of concealment power and finish property on the object to be coated.
- the solid content is preferably in the range of 50 to 150 parts by mass, more preferably in the range of 80 to 120 parts by mass.
- the coating composition of the present invention further contains a yellow iron oxide pigment.
- the yellow iron oxide pigment a yellow pigment consisting of iron oxyhydroxide represented by ⁇ -FeO (OH) or ⁇ -Fe 2 O 2 ⁇ H 2 O, of synthetic and of natural is marketed .
- Natural yellow iron oxide has been used as a colorant since prehistoric times, and is classified as ocher, amber, siena, etc., and naturally produced in various parts of the world such as India, France, Italy, South Africa, the United States and China It is.
- Yellow iron oxide itself belongs to the goethite crystal system (orthorhombic) and has a needle shape.
- a needle-like pigment having a length / width of about 6/1 to 10/1 is used from the viewpoint of the color tone of the coating film obtained by painting.
- the length dimension of 0.6 ⁇ m to 1.2 ⁇ m can be used.
- the numerical value indicating the shape of the yellow iron oxide pigment is a numerical value measured by observation with an electron microscope.
- the content of the yellow iron oxide pigment in the coating composition of the present invention is a resin composition 100 solids part by mass, which is a vehicle-forming component described later, from the viewpoint of controlling the color tone and ultraviolet transmission of a coating film obtained by coating.
- the solid content is preferably in the range of 0.01 parts by mass to 1 part by mass, and more preferably in the range of 0.05 parts by mass to 0.5 parts by mass.
- the coating composition of the present invention contains a carbon black pigment having a primary average particle diameter of 15 nm or more and 80 nm or less for the purpose of controlling the brightness and hue of the coating film.
- the primary average particle diameter of the carbon black pigment and the average particle diameter of the structure are average particle diameters measured by observation with an electron microscope. Since carbon black forms a structure, the primary particle diameter of carbon black means a numerical value obtained by measuring the diameter of a spherical portion in the structure. Specifically, the primary average particle size of the carbon black is selected from 100 spherical portions in the structure from the transmission electron microscope image, and free software manufactured by NIH (National Institute of Health): NIH Image 1.63 is used. And calculating the average particle size.
- the content of the carbon black pigment is in the range of 0.01 to 10 parts by mass as the solid content with respect to 100 parts by mass of the resin solid content in the coating composition from the viewpoint of the lightness of the coating film. More preferably, it is in the range of 0.01 to 8 parts by mass.
- the coating composition of the present invention may further contain a scaly aluminum pigment from the viewpoint of concealing the object to be coated.
- the scaly aluminum pigment is generally produced by grinding and grinding aluminum in a ball mill or attritor mill using a grinding aid in the presence of a grinding medium liquid.
- a grinding aid aliphatic amines, aliphatic amides and aliphatic alcohols are used in addition to higher fatty acids such as oleic acid, stearic acid, isostearic acid, lauric acid, palmitic acid and myristic acid.
- Aliphatic hydrocarbons such as mineral spirits are used as the grinding fluid.
- Scale-like aluminum pigments can be roughly classified into leafing type and non-leafing type depending on the type of grinding aid.
- the leafing type is an arrangement (leafing) on the surface of the coating film obtained by painting when blended into a paint composition, giving a strong finish with a metallic feel, heat reflection, and rust prevention Therefore, it is often used for various building materials such as tanks, ducts, piping and roof roofing.
- the scale-like aluminum pigment preferably has an average particle size in the range of 5 to 30 ⁇ m from the viewpoint of the finish of the coated film and the lightness of the hiding power, more preferably the particle size.
- the diameter is in the range of 7 to 25 ⁇ m, particularly preferably in the range of 8 to 23 ⁇ m. It is preferable to use a thickness in the range of 0.05 to 0.5 ⁇ m.
- the particle size and thickness here means a numerical value obtained by observing the scaly aluminum pigment with an optical microscope or an electron microscope, or a numerical value measured with a particle size distribution measuring apparatus using a laser such as a laser diffraction method. To do.
- the content thereof is 0.1 to 25 mass in total with respect to 100 mass parts of the resin solid content in the paint from the viewpoint of the finish of the coating film obtained by coating. Is preferably in the range of 0.3 to 20 parts by mass, particularly preferably in the range of 0.5 to 20 parts by mass.
- the average value of the light transmittance at a wavelength of 420 nm to 480 nm of the coating film obtained by coating so as to be 25 ⁇ m as a cured coating film is 0.1 to 1.0%.
- the amount composition of the coloring material is adjusted.
- the light transmittance is applied to a smooth PTFE plate so that the cured coating thickness becomes 25 ⁇ m, and the cured and peeled coating is measured with a spectrophotometer UV3700 (trade name, manufactured by Shimadzu Corporation). It shall be defined as a measured value.
- the coating composition of the present invention has an a * value within the range of the L * value in the L * a * b * color system of the coating film obtained by coating to be 25 ⁇ m as a cured coating film in the range of 80 to 95. Is in the range of ⁇ 2.0 to 2.0 and the b * value is in the range of 0.1 to 5.0.
- the L * a * b * color system is a color system that was standardized by the International Commission on Illumination (CIE) in 1976 and adopted in JIS Z 8729 in Japan. Lightness is L *, hue and color. The chromaticity indicating the degree is represented by a * and b *. a * indicates the red direction (-a * is the green direction), and b * indicates the yellow direction (-b * is the blue direction).
- L *, a *, and b * in this specification are a multi-angle spectrophotometer MA-68II (trade name, manufactured by Danaher), the irradiation direction of illumination light to the coating film is 45 degrees, and the light receiving angle is It is defined as a numerical value calculated from the spectral reflectance received at 45 degrees with respect to the regular reflection light.
- the coloring pigments such as the chlorine-based titanium oxide pigment and the yellow iron oxide pigment can be blended in the coating as powder, but the coloring pigment is mixed and dispersed with a part of the resin composition. It is also possible to prepare a pigment dispersion in advance and mix it with the remaining resin components and other components to form a paint. In preparing the pigment dispersion, conventional paint additives such as an antifoaming agent, a dispersing agent, and a surface conditioner can be used as necessary.
- the coating composition of the present invention contains a resin composition as a vehicle forming component.
- a base resin such as an acrylic resin, a polyester resin, an alkyd resin, or a urethane resin having a crosslinkable functional group such as a hydroxyl group, and a crosslink such as a melamine resin, a urea resin, or a polyisocyanate compound (including a block body).
- a base resin such as an acrylic resin, a polyester resin, an alkyd resin, or a urethane resin having a crosslinkable functional group such as a hydroxyl group
- a crosslink such as a melamine resin, a urea resin, or a polyisocyanate compound (including a block body).
- additives such as a solvent such as water or an organic solvent, a pigment dispersant, a curing catalyst, an antifoaming agent, an antioxidant, an ultraviolet absorber, and a surface conditioner are added to the coating composition of the present invention as necessary.
- a solvent such as water or an organic solvent
- a pigment dispersant such as water or an organic solvent
- an antifoaming agent such as sodium bicarbonate
- an antioxidant such as sodium bicarbonate
- an ultraviolet absorber such as sodium bicarbonate
- a surface conditioner such as sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate, sodium bicarbonate
- the coating composition of the present invention is prepared by mixing and dispersing the aforementioned components.
- the solid content at the time of coating is preferably adjusted to 12 to 60% by mass, preferably 15 to 50% by mass based on the coating composition.
- the coating composition of the present invention can be applied by a known method such as rotary atomization coating, air spraying, airless spraying, etc. after adding water or an organic solvent to adjust the viscosity to an appropriate level for coating.
- the thickness can be applied so as to be in the range of 15 to 40 ⁇ m based on the cured coating film.
- the coating composition is applied to an object to be coated, and a color base coating film is laminated on the obtained coating film.
- Examples of objects to be coated include metals such as iron, zinc, aluminum, and magnesium, alloys containing these, molded products plated or vapor-deposited with these metals, and molded products made of glass, plastic, foam, etc. Can be mentioned.
- the article to be coated can be appropriately subjected to degreasing treatment or surface treatment.
- the undercoat film is formed to conceal the surface of the material or impart anticorrosion and rustproofness to the material, and can be obtained by applying an undercoat paint, drying and curing. it can.
- the type of the undercoat paint is not particularly limited, and examples thereof include an electrodeposition paint and a solvent-type primer.
- the color base coating film is a coating film exhibiting a solid color whose color appearance does not change depending on the observation angle.
- the color base coating film can be formed by applying a color base paint.
- the color base paint usually contains a color pigment.
- the coloring pigment is not particularly limited, and specifically, for example, azo pigments, quinacridone pigments, diketopyrrolopyrrole pigments, perylene pigments, perinone pigments, benzimidazolone pigments, Organic pigments such as isoindoline pigments, isoindolinone pigments, metal chelate azo pigments, phthalocyanine pigments, indanthrone pigments, dioxazine pigments, selenium pigments, indigo pigments; metal oxides such as titanium oxide pigments A pigment, a carbon black pigment, etc. are mentioned, These can be used individually or in combination of 2 types or more, respectively.
- the blending amount of the color pigment in the color base coating is usually 0.01 to 150 parts by mass as a solid with respect to 100 parts by mass of the resin solid in the coating composition from the viewpoint of the brightness of the multilayer coating film. In particular, it is preferably in the range of 0.05 to 120 parts by mass.
- the color pigment to be blended in the color base paint of the present invention can be blended in the paint as a powder.
- a pigment dispersion is prepared in advance by mixing and dispersing the color pigment with a part of the resin composition, and this is left as the rest. It can also be made into a paint by mixing with other resin components and other components.
- conventional paint additives such as an antifoaming agent, a dispersing agent, and a surface conditioner can be used as necessary.
- the color base paint of the present invention can usually contain a resin component as a vehicle.
- the resin component include base resins such as acrylic resins, polyester resins, alkyd resins, and urethane resins having a crosslinkable functional group such as a hydroxyl group, melamine resins, urea resins, polyisocyanate compounds (block bodies).
- base resins such as acrylic resins, polyester resins, alkyd resins, and urethane resins having a crosslinkable functional group such as a hydroxyl group, melamine resins, urea resins, polyisocyanate compounds (block bodies).
- a crosslinking agent such as an organic solvent and / or a solvent such as water.
- a solvent such as water or an organic solvent, a dispersant, an anti-settling agent, a curing catalyst, an antifoaming agent, an antioxidant, an ultraviolet absorber, a surface conditioner, Various additives such as a rheology control agent, extender pigments and the like can be appropriately blended.
- the metallic base paint of the present invention is prepared by mixing and dispersing the aforementioned components.
- the solid content at the time of painting is adjusted to 12 to 60% by mass, preferably 15 to 50% by mass based on the coating composition, and the viscosity at 20 ° C. is adjusted to 17 to 23 seconds / ford cup # 3. It is preferable to keep it.
- the color base paint of the present invention can be applied by a method such as electrostatic coating, air spraying, airless spraying, and the film thickness is within the range of 5 to 30 ⁇ m based on the cured coating film. It is preferable from the point of smoothness.
- the color base coating film is a coating film exhibiting a metallic color whose color appearance changes depending on the observation angle.
- the color base coating film is formed by applying the metallic coating composition on the coating film of the coating composition of the present invention and further applying the top clear coating on the obtained coating film.
- the metallic paint composition contains a scaly glittering pigment for the purpose of imparting a particle feeling to a coating film obtained by painting.
- a scaly glittering pigment for the purpose of imparting a particle feeling to a coating film obtained by painting.
- the scale-like glitter pigment one or a plurality of types can be appropriately selected from a light reflective pigment and a light interference pigment.
- the light-reflecting pigment include scaly metal pigments such as aluminum, copper, nickel alloy, and stainless steel, scaly metal pigments whose surfaces are coated with metal oxides, and color pigments that are chemisorbed or bonded to the surface.
- Scaly metal pigments scaly aluminum pigments having an aluminum oxide layer formed by causing an oxidation reaction on the surface, and the like. From the point of view, a scaly aluminum pigment can be used.
- the scaly aluminum pigment is generally produced by grinding and grinding aluminum in a ball mill or attritor mill using a grinding aid in the presence of a grinding medium liquid.
- a grinding aid aliphatic amines, aliphatic amides and aliphatic alcohols are used in addition to higher fatty acids such as oleic acid, stearic acid, isostearic acid, lauric acid, palmitic acid and myristic acid.
- Aliphatic hydrocarbons such as mineral spirits are used as the grinding fluid.
- Scale-like aluminum pigments can be roughly classified into leafing type and non-leafing type depending on the type of grinding aid.
- the leafing type is an arrangement (leafing) on the surface of the coating film obtained by painting when blended into a paint composition, giving a strong finish with a metallic feel, heat reflection, and rust prevention Therefore, it is often used for various building materials such as tanks, ducts, pipes and roof roofings for production facilities.
- leafing type scaly aluminum pigments can be used, but when this type of scaly aluminum pigments are used, depending on the amount of the scaly aluminum pigments, Care must be taken because the surface tension may completely hide the surface due to the effect of the surface tension and the graininess may not be expressed. From this point, it is preferable to use a non-leafing type scaly aluminum pigment.
- the scale-like aluminum pigment preferably has an average particle size in the range of 8 to 25 ⁇ m from the viewpoint of the finish of the coated film, the brightness of highlights and the particle feeling.
- the particle diameter is preferably in the range of 10 to 18 ⁇ m. It is preferable to use a thickness in the range of 0.2 to 1.0 ⁇ m.
- the particle size and thickness herein mean the median diameter of the volume-based particle size distribution measured by a laser diffraction scattering method using a Microtrac particle size distribution measuring device MT3300 (trade name, manufactured by Nikkiso Co., Ltd.).
- the coating film obtained by coating may have an excessive particle feeling, which may be undesirable in design, and if it is less than the lower limit, the particle feeling may be insufficient.
- a light interference pigment can be used as the scaly glitter pigment.
- the light interference pigment specifically, a pigment obtained by coating a translucent substrate such as natural mica, artificial mica, alumina flake, silica flake, glass flake or the like with a metal oxide can be used.
- the metal oxide-coated mica pigment is a pigment having natural mica or artificial mica as a base material and the surface of the base material coated with a metal oxide.
- Natural mica is a scaly substrate obtained by crushing ore mica (mica), and artificial mica is made of industrial raw materials such as SiO 2 , MgO, Al 2 0 3 , K 2 SiF 6 , Na 2 SiF 6, etc. It is synthesized by heating, melting at a high temperature of about 1500 ° C., cooling and crystallizing, and has less impurities and a uniform size and thickness when compared with natural mica.
- fluorine phlogopite mica KMg 3 AlSi 3 O 10 F 2
- potassium tetrasilicon mica KMg 25 AlSi 4 O 10 F 2
- sodium tetrasilicon mica NaMg 25 AlSi 4 O 10 F 2
- Na Teniolite NaMg 2 LiSi 4 O 10 F 2
- LiNa teniolite LiMg 2 LiSi 4 O 10 F 2
- the metal oxide to be coated include titanium oxide and iron oxide. Depending on the coating thickness, an interference color can be developed.
- the metal oxide-coated alumina flake pigment is a pigment having alumina flake as a base material and a metal oxide coated on the surface of the base material.
- Alumina flake means scaly (flaky) aluminum oxide and is colorless and transparent. It does not need to be a single component of aluminum oxide, and may contain oxides of other metals. Examples of the metal oxide to be coated include titanium oxide and iron oxide. Depending on the coating thickness, an interference color can be developed.
- the metal oxide-coated silica flake pigment is obtained by coating scaly silica, which is a substrate having a smooth surface and a uniform thickness, with a metal oxide having a refractive index different from that of the substrate.
- scaly silica which is a substrate having a smooth surface and a uniform thickness
- metal oxide having a refractive index different from that of the substrate examples include titanium oxide and iron oxide.
- an interference color can be developed.
- the metal oxide-coated glass flake pigment is a glass substrate coated with a metal oxide, and the surface of the substrate is smooth, so that strong light reflection occurs and a particle feeling is expressed.
- the metal oxide to be coated include titanium oxide and iron oxide. Depending on the coating thickness, an interference color can be developed.
- the light interference pigment may be subjected to a surface treatment for improving dispersibility, water resistance, chemical resistance, weather resistance, and the like.
- the size of the above-mentioned light interference pigment is natural mica, artificial mica, alumina flakes, silica flakes with an average particle size in the range of 5 to 30 ⁇ m. From the viewpoint of the property and particle feeling, it is more preferable that the particle diameter is in the range of 7 to 25 ⁇ m. In the case of glass flakes, it is preferable to use those having an average particle diameter in the range of 15 to 100 ⁇ m.
- the coated film is preferable from the viewpoint of particle feeling, and more preferably has a particle diameter in the range of 17 to 45 ⁇ m. It is preferable to use a thickness in the range of 0.05 to 7.0 ⁇ m.
- the particle size and thickness herein mean the median diameter of the volume-based particle size distribution measured by a laser diffraction scattering method using a Microtrac particle size distribution measuring device MT3300 (trade name, manufactured by Nikkiso Co., Ltd.).
- the particle feeling due to the light interference pigment may be excessive in the multilayer coating film, which may be undesirable in design, and when the average particle diameter is less than the lower limit, the particle feeling may be insufficient. .
- the content of the scaly glittering pigment in the metallic paint composition is in total with respect to 100 parts by mass of the solid content of the resin composition in the paint from the viewpoint of the finish of the coating film obtained by coating and the feeling of particles. It is preferably in the range of 0.01 to 25 parts by mass, more preferably in the range of 0.01 to 15 parts by mass, and particularly preferably in the range of 0.05 to 5 parts by mass.
- a coloring pigment can be blended for the purpose of finely adjusting the hue and brightness of the coating film obtained by painting.
- the coloring pigment is not particularly limited, and specifically, for example, a transparent iron oxide pigment, a composite oxide pigment such as titanium yellow, a titanium oxide pigment containing fine particle titanium oxide, a carbon black pigment, etc.
- Inorganic pigments examples include organic pigments such as phthalocyanine pigments, indanthrone pigments, dioxazine pigments, selenium pigments, and indigo pigments, and these can be used alone or in combination of two or more.
- a transparent pigment having a primary particle diameter of 200 nm or less from the viewpoint of color change depending on the observation angle of the coating film obtained by coating is preferably used.
- the colored pigment can be blended in the paint as a powder, but a pigment dispersion is prepared in advance by mixing and dispersing the colored pigment with a part of the resin composition, and this is used as the remaining resin component and other components. It can also be made into a paint by mixing together.
- conventional paint additives such as an antifoaming agent, a dispersing agent, and a surface conditioner can be used as necessary.
- the blending amount is usually 0.01 to 10 with respect to 100 solid parts by mass of the resin composition in the coating from the viewpoint of the brightness of the multilayer coating film.
- the content is preferably in the range of parts by mass, particularly preferably in the range of 0.01 to 5 parts by mass.
- the metallic paint composition in the coating film forming method of the present invention contains a resin composition as a vehicle forming component.
- a base resin such as an acrylic resin, a polyester resin, an alkyd resin, or a urethane resin having a crosslinkable functional group such as a hydroxyl group, and a crosslink such as a melamine resin, a urea resin, or a polyisocyanate compound (including a block body).
- a base resin such as an acrylic resin, a polyester resin, an alkyd resin, or a urethane resin having a crosslinkable functional group such as a hydroxyl group, and a crosslink such as a melamine resin, a urea resin, or a polyisocyanate compound (including a block body).
- additives such as a solvent such as water or an organic solvent, a pigment dispersant, a curing catalyst, an antifoaming agent, an antioxidant, an ultraviolet absorber, and a surface conditioner are added to the metallic coating composition as necessary. Further, gloss adjusting agents, extender pigments and the like can be appropriately blended.
- the metallic coating composition is prepared by mixing and dispersing the aforementioned components.
- the solid content at the time of coating is preferably adjusted to 12 to 60% by mass, preferably 15 to 50% by mass based on the coating composition.
- the metallic coating composition in the coating film forming method of the present invention is adjusted to a viscosity suitable for coating by adding water or an organic solvent, and then coated by a known method such as rotary atomization coating, air spray, airless spray, etc. From the viewpoint of the smoothness of the coating film and the like, the film thickness can be applied within a range of 15 to 40 ⁇ m based on the cured coating film.
- the metallic coating composition is applied onto the coating film formed of the coating composition described above. At this time, it can be applied to the cured coating film by irradiation with heat or electron beam. Alternatively, the metallic coating composition can be applied in a state where the coating film made of the coating composition is uncured.
- a top clear coating film is formed by applying a top clear coating onto a cured or uncured coating film by the metallic coating composition.
- the top clear coating is a single-layer coating formed by applying a top clear coating and then drying and curing, or it is formed by repeating the top clear coating coating, drying and curing processes a plurality of times. Two or more coating films may be used. By forming the top clear coating film as a coating film of two or more layers, it is possible to improve the finish and sharpness of the multilayer coating film.
- the first top clear coating layer and the second and subsequent top clear coating layers may be the same material or different materials. It may be.
- the top clear coating used in the coating film forming method of the present invention contains a base resin and a crosslinking agent as vehicle forming components, and further contains a colorless or colored transparent coating obtained by appropriately blending a solvent or other coating additives.
- a liquid paint for forming a film which is known per se can be used without limitation.
- the base resin include, for example, an acrylic resin, a polyester resin, an alkyd resin, a fluororesin, a urethane resin, and a silicon-containing resin containing a crosslinkable functional group such as a hydroxyl group, a carboxyl group, a silanol group, and an epoxy group. Can be mentioned.
- crosslinking agent examples include melamine resin, urea resin, polyisocyanate compound, block polyisocyanate compound, epoxy compound or resin, carboxyl group-containing compound or resin, acid anhydride, alkoxysilane group that can react with the functional group of the base resin.
- examples thereof include a containing compound or a resin.
- paint additives such as a solvent such as water or an organic solvent, a curing catalyst, an antifoaming agent, a rheology control agent, an antioxidant, a surface conditioner, and a gloss conditioner can be appropriately blended.
- a color pigment can be appropriately blended within a range not impairing transparency.
- the color pigment pigments known per se for ink and paint can be used alone or in combination of two or more.
- the amount added can be appropriately determined within a range that does not substantially impair the transparency of the coating film.
- the total solid content of the base resin and the crosslinking agent in the top clear paint The amount can be usually 15 parts by mass or less, preferably 0.01 to 5 parts by mass with respect to 100 parts by mass.
- the top clear paint can be applied by a method known per se such as rotary atomization paint, air spray, airless spray, etc. after adjusting the viscosity to be suitable for painting by adding water or an organic solvent.
- the film thickness is usually within the range of 5 to 40 ⁇ m, particularly 20 to 35 ⁇ m, based on the cured coating film.
- the top clear coating film itself can be crosslinked and cured at a temperature in the range of from room temperature to about 150 ° C.
- the second and subsequent top clear coatings can be formed on the dried and cured coating of the first top clear coating. After the first layer of top clear coating is applied, a second layer of top clear coating may be formed on the uncured coating.
- Part and % are based on mass.
- the number average molecular weight of the hydroxyl group-containing acrylic resin is measured by gel permeation chromatography (GPC) using a standard polystyrene calibration curve.
- ethylene glycol monoethyl ether acetate was distilled off under reduced pressure to obtain a hydroxyl group-containing acrylic resin 1 having a hydroxyl value of 54 mgKOH / g, a number average molecular weight of 20,000, and a resin solid content of 65% by mass.
- the number average molecular weight means that measured by gel permeation chromatography (GPC) using a standard polystyrene calibration curve.
- Monomer / polymerization initiator mixture 1 38 parts of methyl methacrylate, 17 parts of ethyl acrylate, 17 parts of n-butyl acrylate, 7 parts of hydroxyethyl methacrylate, 20 parts of lauryl methacrylate and 1 part of acrylic acid and 2,2′-azobis A mixture consisting of 2 parts of (2-methylpropionitrile).
- the coating composition 1 to 13 was applied to a smooth PTFE plate to a thickness of 25 ⁇ m as a cured coating film, left in a laboratory at room temperature of about 20 ° C. for 15 minutes, and then heated at 140 ° C. using a hot air dryer. It was dried for 30 minutes to obtain a cured coating film. The obtained coating film was peeled off to create a free film, and the light transmittance at a wavelength of 420 nm to 480 nm was measured using a spectrophotometer UV3700 (trade name, manufactured by Shimadzu Corporation). Indicated.
- Coating compositions 1 to 7 were evaluated for finish properties by the following method: (Evaluation of finish) The test plate used for the measurement of the above L *, a *, and b * was observed under illumination with an artificial sun lamp (manufactured by Celick, color temperature 6500K), and the finish was evaluated in five stages. It was shown in 1. The highest rating is 5, and the lowest rating is 1. The evaluation was conducted by a total of 5 designers and 3 engineers engaged in color development for 3 years or more, and the average score was adopted. The results are shown in Table 2.
- Cationic electrodeposition paint "Electron 9400HB” (trade name: manufactured by Kansai Paint Co., Ltd., blocked as epoxy resin polyamine-based cationic resin on a degreased and zinc phosphate-treated steel plate (JISG3141, size 400 x 300 x 0.8 mm) (Using a polyisocyanate compound) was electrodeposited so as to have a film thickness of 20 ⁇ m based on the cured coating film and heated at 170 ° C. for 20 minutes for crosslinking and curing to obtain an electrodeposition coating film.
- Example 8 On the electrodeposition coating film, paint composition 1 was applied as a cured coating film to a thickness of 25 ⁇ m using an air spray and left in a laboratory at room temperature of about 20 ° C. for 15 minutes, and then a hot air dryer was used. Then, on the coating film obtained by drying at 140 ° C. for 30 minutes, the color base paint 1 is applied as a cured coating film using an air spray so as to have a thickness of 25 ⁇ m. After leaving for 15 minutes, a test plate was prepared by drying at 140 ° C. for 30 minutes using a warm air dryer.
- Example 9 On the electrodeposition coating film, paint composition 1 was applied as a cured coating film to a thickness of 25 ⁇ m using an air spray and left in a laboratory at room temperature of about 20 ° C. for 15 minutes, and then a hot air dryer was used. On the coating film obtained by drying at 140 ° C. for 30 minutes, the metallic base paint 1 was applied as a cured coating film using an air spray so as to have a thickness of 15 ⁇ m. For 15 minutes, and then apply a top clear paint (Lugabake Clear, Kansai Paint, trade name, acrylic resin / amino resin type, organic solvent type) to a thickness of 30 ⁇ m using air spray. After being left in a laboratory at 20 ° C. for 15 minutes, a test plate was prepared by drying at 140 ° C. for 30 minutes using a hot air dryer.
- a top clear paint Lugabake Clear, Kansai Paint, trade name, acrylic resin / amino resin type, organic solvent type
- Example 10 A test plate was prepared in the same manner as in Example 9 except that the metallic base paint 2 was used instead of the metallic base paint 1.
- Examples 11, 14, 17, 20, 23, 26, Comparative Examples 4, 7, 10 A test plate was prepared in the same manner as in Example 1 except that the coating composition shown in Table 3 was used as the intermediate coating instead of the coating composition 1.
- Example 12 (Examples 12, 15, 18, 21, 24, 27, Comparative Examples 5, 8, and 11) A test plate was prepared in the same manner as in Example 2 except that the coating composition shown in Table 3 was used as the intermediate coating instead of the coating composition 1.
- Examples 13, 16, 19, 22, 25, 28, Comparative Examples 6, 9, 12 A test plate was prepared in the same manner as in Example 3 except that the coating composition shown in Table 3 was used as the intermediate coating instead of the coating composition 1.
- the remaining monomer emulsion (1) was dripped in the reaction container hold
- the following monomer emulsion (2) was added dropwise over 1 hour, and after aging for 1 hour, the mixture was cooled to 30 ° C while gradually adding 40 parts by mass of a 5% dimethylethanolamine aqueous solution to the reaction vessel, It was discharged while being filtered through nylon cloth, and the average particle size was 100 nm (submicron particle size distribution measuring device “COULTER N4 type” (manufactured by Beckman Coulter, Inc.) and diluted with deionized water and measured at 20 ° C.). An acrylic resin emulsion having a solid content concentration of 30% was obtained. The obtained acrylic resin had an acid value of 33 mgKOH / g and a hydroxyl value of 25 mgKOH / g.
- Monomer emulsion (1) 42 parts by weight of deionized water, 0.72 parts by weight of Aqualon KH-10, 2.1 parts by weight of methylenebisacrylamide, 2.8 parts by weight of styrene, 16.1 parts by weight of methyl methacrylate, ethyl acrylate Monomer emulsion (1) obtained by mixing and stirring 28 parts by mass and 21 parts by mass of n-butyl acrylate.
- Monomer emulsion (2) 18 parts by weight of deionized water, 0.31 parts by weight of Aqualon KH-10, 0.03 parts by weight of ammonium persulfate, 5.1 parts by weight of methacrylic acid, 5.1 parts by weight of 2-hydroxyethyl acrylate
- Monomer emulsion (2) obtained by mixing and stirring 3 parts by weight of styrene, 6 parts by weight of methyl methacrylate, 1.8 parts by weight of ethyl acrylate and 9 parts by weight of n-butyl acrylate.
- polyester resin solution having a solid content concentration of 70% was obtained.
- the obtained polyester resin had an acid value of 46 mgKOH / g, a hydroxyl value of 150 mgKOH / g, and a weight average molecular weight of 6,400.
- the weight average molecular weight means that measured by gel permeation chromatography (GPC) using a standard polystyrene calibration curve.
- Example 29 100 parts of the acrylic resin emulsion obtained in Production Example 2, 33.2 parts of the polyester resin solution obtained in Production Example 3, and 294.1 parts of Pigment Dispersion 1 obtained in Production Example 4 were obtained in Production Example 5.
- 1.0 part of the pigment dispersion 2 obtained, 0.24 part of the pigment dispersion 3 obtained in Production Example 6 and Cymel 325 (trade name, manufactured by Nippon Cytec Industries, Inc., melamine resin, solid content 80%) 37 .5 parts are mixed uniformly, and further, Primal ASE-60 (trade name, manufactured by Rohm and Haas, polyacrylic acid thickener), 2- (dimethylamino) ethanol and deionized water are added to adjust the pH to 8. 0, paint solids 25%, Ford Cup No. 20 at 20 ° C.
- An aqueous coating composition 11 having a viscosity of 40 according to 4 was prepared. The ratio of the coloring material in the aqueous coating composition 11 prepared in Example 29 is the same as that of the coating composition 1.
- the obtained mixture was put into a 225 ml mayonnaise bottle, and 130 parts of 1.5 mm zirconia beads were added and sealed, and dispersed for 120 minutes using a shake type paint conditioner. After dispersion, 100-mesh wire mesh filtration was performed to remove the zirconia beads, and a colored pigment dispersion 4 was obtained.
- Preparation of test plate 2 A coating film obtained by applying an electrodeposition paint to the steel sheet by the method described in “Preparation of test plate 1” is used as an object to be coated.
- the coating composition 11 prepared in Example 29 was applied to the object to be coated using an air spray so that the cured coating film had a thickness of 25 ⁇ m, heated at 80 ° C. for 10 minutes using a hot air drying furnace, and then the color base. Paint 2 is applied as a cured coating film to a thickness of 25 ⁇ m using air spray, and after 15 minutes in a laboratory at room temperature of 20 ° C., heated using a hot air dryer at 140 ° C. for 30 minutes, Prepared. When the obtained test plate was evaluated for the presence or absence of peeling on the electrodeposition coating film by the method described in the aforementioned “accelerated weather resistance test”, no peeling was observed.
- Production Example 8 Production of Phosphate Group-Containing Resin Solution A mixed solvent of 27.5 parts of methoxypropanol and 27.5 parts of isobutanol was added to a reaction vessel equipped with a thermometer, thermostat, stirrer, reflux condenser and dropping device. After being heated to 110 ° C.
- the phosphate group-containing resin had an acid value of 83 mgKOH / g, a hydroxyl value of 29 mgKOH / g, and a weight average molecular weight of 10,000.
- Phosphoric acid group-containing polymerizable monomer 57.5 parts of monobutyl phosphoric acid 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.
- the ratio of the color material in the metallic paint 3 is the same as that of the metallic base paint 1.
- the ratio of the color material in the metallic paint 4 is the same as that of the metallic base paint 2.
- a coating film obtained by applying an electrodeposition paint to the steel sheet by the method described in “Preparation of test plate 1” is used as an object to be coated.
- the coating composition 11 prepared in Example 29 was applied to the object to be coated using an air spray so that the cured coating film had a thickness of 25 ⁇ m and left in a laboratory at a room temperature of about 20 ° C. for 15 minutes.
- the metallic base paint 3 or 4 is applied using an air spray so as to be 15 ⁇ m as a cured coating film, After heating at 80 ° C.
- the top clear paint (Lugabake Clear, manufactured by Kansai Paint, trade name, acrylic resin / amino resin type, organic solvent type) is 30 ⁇ m using air spray.
- the test plate was prepared by leaving it in a laboratory at room temperature of about 20 ° C. for 15 minutes and then drying it at 140 ° C. for 30 minutes using a hot air dryer. When the obtained test plate was evaluated for the presence or absence of peeling on the electrodeposition coating film by the method described in the aforementioned “accelerated weather resistance test”, no peeling was observed.
- Monomer / polymerization initiator mixture 2 27 parts of methyl methacrylate, 17 parts of ethyl acrylate, 23 parts of n-butyl acrylate, 19 parts of hydroxyethyl methacrylate, 30 parts of styrene, 1 part of acrylic acid and 2,2′-azobis (2-methylpropionitrile) 2 A mixture consisting of .5 parts.
- the coating composition 1 is applied as a cured coating film using an air spray so as to have a thickness of 25 ⁇ m, and left in a laboratory at a room temperature of about 20 ° C. for 15 minutes.
- 4 was applied using air spray as a cured coating film to a thickness of 15 ⁇ m, left in a laboratory at room temperature of about 20 ° C. for 15 minutes, and then dried at 140 ° C. for 30 minutes using a hot air dryer. After that, apply the above-mentioned two-component clear paint as a cured coating film using an air spray so as to have a thickness of 30 ⁇ m, and leave it in a laboratory at room temperature of about 20 ° C.
- test plate was evaluated for the presence or absence of peeling on the electrodeposition coating film by the method described in the aforementioned “accelerated weather resistance test”, no peeling was observed.
- the coating composition and coating film forming method of the present invention can be applied to various industrial products, particularly automobile outer plates.
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Abstract
Description
本出願は、2013年7月4日に出願された、日本国特許出願第2013-140309号明細書(その開示全体が参照により本明細書中に援用される)に基づく優先権を主張する。
本発明は、高明度且つ波長420~480nmにおける紫外線透過率が低い塗膜を形成可能な塗料組成物、及び被塗物に前記塗料組成物を塗装して得られた塗膜上に、カラーベース塗膜を積層する塗膜形成方法に関するものである。
1.塩素法酸化チタン顔料、黄色酸化鉄顔料、一次平均粒子径が15~80nmの範囲内であるカーボンブラック顔料及びビヒクル形成成分である樹脂組成物を含む塗料組成物であって、該塗料組成物を硬化塗膜として25μmとなるように塗装して得られた塗膜の波長420nm~480nmにおける光線透過率の平均値が0.1~1.0%の範囲内である塗料組成物、
2.硬化塗膜として25μmとなるように塗装して得られた塗膜のL*a*b*表色系におけるL*値が80~95の範囲内、a*値が-2.0~2.0の範囲内であって且つb*値が0.1~5.0の範囲内である1項に記載の塗料組成物、
3.被塗物に1項又は2項に記載された塗料組成物を塗装して得られた塗膜上に、カラーベース塗膜を形成する塗膜形成方法、
4.カラーベース塗膜が、鱗片状光輝性顔料を含むメタリック塗料組成物を塗装して得られた塗膜と、トップクリヤー塗料を塗装して得られた塗膜を含むものである3項に記載の塗膜形成方法
に関する。
(製造例1)水酸基含有アクリル樹脂1の製造
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エチレングリコールモノエチルエーテルアセテート50部を仕込み、撹拌混合し、135℃に昇温した。次いで下記のモノマー/重合開始剤の混合物1を3時間かけて、同温度に保持した反応容器内に滴下し、滴下終了後1時間熟成を行なった。その後、エチレングリコールモノエチルエーテルアセテート10部、2,2'-アゾビス(2-メチルプロピオニトリル)0.6部からなる混合物を同温度に保持した1時間30分かけて滴下し、さらに2時間熟成した。次にエチレングリコールモノエチルエーテルアセテートを減圧下で留去し、水酸基価54mgKOH/g、数平均分子量20,000、樹脂固形分65質量%の水酸基含有アクリル樹脂1を得た。ここで数平均分子量とは、ゲル浸透クロマトグラフィー(GPC)によって標準ポリスチレンの検量線を用いて測定したものを意味する。
モノマー/重合開始剤の混合物1:
メチルメタクリレ-ト38部、エチルアクリレ-ト17部、n-ブチルアクリレ-ト17部、ヒドロキシエチルメタクリレ-ト7部、ラウリルメタクリレ-ト20部及びアクリル酸1部及び2,2'-アゾビス(2-メチルプロピオニトリル)2部からなる混合物。
製造例1で得られた水酸基含有アクリル樹脂1を75部、ユーバン28-60(商品名、ブチルエーテル化メラミン樹脂、三井化学社製)25部からなる樹脂成分100部(固形分)あたり、表1に示す配合割合(PHR)にて顔料を配合して攪拌混合し、塗装に適正な粘度に希釈して、固形分約25%の塗料組成物1~10を調製した。
平滑なPTFE板に上記塗料組成物1~13を硬化塗膜として25μmとなるように塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して140℃で30分間乾燥せしめて、硬化塗膜を得た。得られた塗膜を剥離してフリーフィルムを作成し、分光光度計UV3700(商品名、島津製作所社製)を使用して波長420nm~480nmの光線透過率を測定し、平均値を表1に示した。
予めN-7グレー色の中塗り塗膜が形成されたブリキ板に、上記塗料組成物1~10を硬化塗膜として25μmとなるように塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して140℃で30分間乾燥せしめて、硬化塗膜を得た。多角度分光光度計MA-68II(商品名、ダナハー社製)を用いて、塗膜への照明光の照射方向は45度、受光角度は正反射光に対して45度で受光した分光反射率から、L*,a*及びb*を計算し、結果を表1に示した。
(仕上がり性の評価)
上記L*,a*,b*の測定に使用した試験板を、人工太陽灯(セリック社製、色温度6500K)による照明下で観察して、仕上がり性を5段階で評価し、結果を表1に示した。最も高評価を5、最も低評価を1とする。評価は、色彩開発に3年以上従事するデザイナー2名と技術者3名の計5名が行ない、平均点を採用した。結果を表2に示す。
製造例1で得られた水酸基含有アクリル樹脂75部、ユーバン28-60(商品名、ブチルエーテル化メラミン樹脂、三井化学社製)25部からなる樹脂成分100部(固形分)あたり、TIPAQUE CR-95(商品名,硫酸法酸化チタン顔料,石原産業社製)100質量部を配合して攪拌混合し、塗装に適正な粘度に希釈して、固形分約25%のカラーベース塗料を調製した。
製造例1で得られた水酸基含有アクリル樹脂75部、ユーバン28-60(商品名、ブチルエーテル化メラミン樹脂、三井化学社製)25部からなる樹脂成分100部(固形分)あたり、Xirallic T60-10WNTCrystal Silver(商品名,酸化チタン被覆酸化アルミニウムフレーク顔料,メルク社製)10質量部を配合して攪拌混合し、塗装に適正な粘度に希釈して、固形分約25%のメタリックベース塗料1を調製した。
製造例1で得られた水酸基含有アクリル樹脂75部、ユーバン28-60(商品名、ブチルエーテル化メラミン樹脂、三井化学社製)25部からなる樹脂成分100部(固形分)あたり、アルミニウムペースト7640NS(商品名,アルミニウムフレーク顔料ペースト,東洋アルミ社製,固形分65質量%)7.2質量部(固形分:5質量部)を配合して攪拌混合し、塗装に適正な粘度に希釈して、固形分約25%のメタリックベース塗料2を調製した。
脱脂及びりん酸亜鉛処理した鋼板(JISG3141、大きさ400×300×0.8mm)にカチオン電着塗料「エレクロン9400HB」(商品名:関西ペイント社製、エポキシ樹脂ポリアミン系カチオン樹脂に硬化剤としてブロックポリイソシアネート化合物を使用)を硬化塗膜に基づいて膜厚20μmになるように電着塗装し、170℃で20分加熱して架橋硬化させて電着塗膜を得た。
電着塗膜上に、塗料組成物1を硬化塗膜として25μmとなるようにエアスプレーを使用して塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して140℃で30分間乾燥せしめて得られた塗膜上に、上記カラーベース塗料1を、硬化塗膜として25μmとなるようにエアスプレーを使用して塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して140℃で30分間乾燥せしめて試験板を調整した。
電着塗膜上に、塗料組成物1を硬化塗膜として25μmとなるようにエアスプレーを使用して塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して140℃で30分間乾燥せしめて得られた塗膜上に、上記メタリックベース塗料1を、硬化塗膜として15μmとなるようにエアスプレーを使用して塗装し、室温約20℃の実験室に15分放置した後に、トップクリヤー塗料(ルーガベーククリヤー、関西ペイント製、商品名、アクリル樹脂・アミノ樹脂系、有機溶剤型)をエアスプレーを使用して30μmとなるように塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して140℃で30分間乾燥せしめて試験板を調製した。
メタリックベース塗料1に換えてメタリックベース塗料2を使用する以外は実施例9と同様にして試験板を調整した。
塗料組成物1に換えて、表3に示した塗料組成物を中塗り塗料として使用する以外は実施例1と同様にして試験板を調製した。
塗料組成物1に換えて、表3に示した塗料組成物を中塗り塗料として使用する以外は実施例2と同様にして試験板を調製した。
塗料組成物1に換えて、表3に示した塗料組成物を中塗り塗料として使用する以外は実施例3と同様にして試験板を調製した。
Superxenonウェザーメーター(商品名、促進耐候性試験機、スガ試験機社製)を使用して、JIS K5600-7-7(方法1)に記載された試験条件にて照射と降雨条件を組み合わせたサイクル試験を行った。サイクル試験時間の合計が3000時間後に、試験板を観察して、電着塗膜上のはがれの有無を評価し、結果を表3に示した。
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脱イオン水130質量部、アクアロンKH-10(商品名、界面活性剤、第一工業製薬社製)0.52質量部を仕込み、窒素気流中で撹拌混合し、80℃に昇温した。次いで下記のモノマー乳化物(1)のうちの全量の1%量及び6%過硫酸アンモニウム水溶液5.3質量部とを反応容器内に導入し80℃で15分間保持した。その後、残りのモノマー乳化物(1)を3時間かけて、同温度に保持した反応容器内に滴下し、滴下終了後1時間熟成を行なった。その後、下記のモノマー乳化物(2)を1時間かけて滴下し、1時間熟成した後、5%ジメチルエタノールアミン水溶液40質量部を反応容器に徐々に加えながら30℃まで冷却し、100メッシュのナイロンクロスで濾過しながら排出し、平均粒子径100nm(サブミクロン粒度分布測定装置「COULTER N4型」(ベックマン・コールター社製)を用いて、脱イオン水で希釈し20℃で測定した。)、固形分濃度30%のアクリル樹脂エマルションを得た。得られたアクリル樹脂は、酸価が33mgKOH/g、水酸基価が25mgKOH/gであった。
温度計、サーモスタット、攪拌装置、還流冷却器及び水分離器を備えた反応容器に、トリメチロールプロパン109質量部、1,6-ヘキサンジオール141質量部、ヘキサヒドロ無水フタル酸126質量部及びアジピン酸120質量部を仕込み、160℃から230℃に達するまでの時間を3時間となるように昇温させた後、230℃で4時間縮合反応させた。次いで、得られた縮合反応生成物にカルボキシル基を付加するために、さらに無水トリメリット酸38.3質量部を加え、170℃で30分間反応させた後、2-エチル-1-ヘキサノールで希釈し、固形分濃度70%であるポリエステル樹脂溶液を得た。得られたポリエステル樹脂は、酸価が46mgKOH/g、水酸基価が150mgKOH/g、重量平均分子量が6,400であった。ここで重量平均分子量とは、ゲル浸透クロマトグラフィー(GPC)によって標準ポリスチレンの検量線を用いて測定したものを意味する。
撹拌混合容器に、製造例3で得られたポリエステル樹脂溶液8.6部(固形分6部)、TIPAQUR UT-771(商品名,塩素法酸化チタン顔料,石原産業社製)36部及び脱イオン水61.3部を入れ、均一に混合し、更に、2-(ジメチルアミノ)エタノールを添加して、pH7.5に調整した。得られた混合物225ml容マヨネーズビンに入れ、1.5mm径のジルコニアビーズ130部を投入して密栓し、振とう型ペイントコンディショナーを使用して120分分散した。分散後100メッシュの金網濾過を行なってジルコニアビーズを除去して、着色顔料分散体1を得た。
撹拌混合容器に、製造例3で得られたポリエステル樹脂溶液8.6部(固形分6部)、TAROX LL-50(商品名,黄色酸化鉄顔料,チタン工業社製)30部及び脱イオン水61.3部を入れ、均一に混合し、更に、2-(ジメチルアミノ)エタノールを添加して、pH7.5に調整した。得られた混合物225ml容マヨネーズビンに入れ、1.5mm径のジルコニアビーズ130部を投入して密栓し、振とう型ペイントコンディショナーを使用して120分分散した。分散後100メッシュの金網濾過を行なってジルコニアビーズを除去して、着色顔料分散体2を得た。
撹拌混合容器に、製造例3で得られたポリエステル樹脂溶液25.7部(固形分18部)、Supecial Black100(商品名,カーボンブラック顔料.一次平均粒子径50nm.オリオンエンジニアカーボン社製)18部及び脱イオン水61.3部を入れ、均一に混合し、更に、2-(ジメチルアミノ)エタノールを添加して、pH7.5に調整した。得られた混合物225ml容マヨネーズビンに入れ、1.5mm径のジルコニアビーズ130部を投入して密栓し、振とう型ペイントコンディショナーを使用して120分分散した。分散後100メッシュの金網濾過を行なってジルコニアビーズを除去して、着色顔料分散体3を得た。
製造例2で得られたアクリル樹脂エマルション100部、製造例3で得られたポリエステル樹脂溶液33.2部、製造例4で得られた顔料分散体1を294.1部、製造例5で得られた顔料分散体2を1.0部、製造例6で得られた顔料分散体3を0.24部及びサイメル325(商品名、日本サイテックインダストリーズ社製、メラミン樹脂、固形分80%)37.5部を均一に混合し、さらに、プライマルASE-60(商品名、ロームアンドハース社製、ポリアクリル酸系増粘剤)、2-(ジメチルアミノ)エタノール及び脱イオン水を加えてpH8.0、塗料固形分25%、20℃におけるフォードカップNo.4による粘度40秒の水性塗料組成物11を調製した。本実施例29で調整した水性塗料組成物11における色材の比率は、塗料組成物1と同一である。
撹拌混合容器に、製造例3で得られたポリエステル樹脂溶液8.6部(固形分6部)、TIPAQUE CR-95(商品名,硫酸法酸化チタン顔料,石原産業社製)36部、「SOLSPERSE 12000」(商品名、LUBRISOL社製、フタロシアニン系顔料誘導体)1.4部及び脱イオン水61.3部を入れ、均一に混合し、更に、2-(ジメチルアミノ)エタノールを添加して、pH7.5に調整した。得られた混合物225ml容マヨネーズビンに入れ、1.5mm径のジルコニアビーズ130部を投入して密栓し、振とう型ペイントコンディショナーを使用して120分分散した。分散後100メッシュの金網濾過を行なってジルコニアビーズを除去して、着色顔料分散体4を得た。
製造例2で得られたアクリル樹脂エマルション100部、製造例3で得られたポリエステル樹脂溶液33.9部、製造例7で得られた顔料分散体4を298.1部及びサイメル325(商品名、日本サイテックインダストリーズ社製、メラミン樹脂、固形分80%)37.5部を均一に混合し、さらに、プライマルASE-60(商品名、ロームアンドハース社製、ポリアクリル酸系増粘剤)、2-(ジメチルアミノ)エタノール及び脱イオン水を加えてpH8.0、塗料固形分25%、20℃におけるフォードカップNo.4による粘度40秒の水性塗料組成物を調製した。
カラーベース塗料2における色材の比率は、カラーベース塗料と同一である。
前記「試験板の作製1」に記載の方法で前記鋼板に電着塗料を塗装して得られた塗膜を被塗物とする。当該被塗物に実施例29で調整した塗料組成物11をエアスプレーを使用して、硬化塗膜として25μmとなるように塗装し、熱風乾燥炉を使用して80℃10分間加熱後、カラーベース塗料2をエアスプレーを使用して硬化塗膜として25μmとなるように塗装し、室温20℃の実験室に15分間後、熱風乾燥機を使用して、140℃30分間加熱し、試験板を調製した。得られた試験板について前述の「促進耐候性試験」に記載の方法で電着塗膜上のはがれの有無を評価したところ、はがれは観察されなかった。
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℃に加熱した後、110℃に保持しつつ、スチレン25部、n-ブチルメタクリレート27.5部、分岐高級アルキルアクリレート(商品名「イソステアリルアクリレート」、大阪有機化学工業社製)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tert-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滴下し、さらにtert-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部とからなる混合物を1時間滴下した。その後、1時間攪拌熟成して固形分50%のリン酸基含有樹脂溶液を得た。リン酸基含有樹脂は、酸価が83mgKOH/g、水酸基価が29mgKOH/g、重量平均分子量が10,000であった。
リン酸基含有重合性モノマー: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モノブチルリン酸57.5部及びイソブタノール41部を入れ、90℃に昇温させた。その後、グリシジルメタクリレート42.5部を2時間かけて滴下した後、さらに1時間攪拌熟成した。次いで、イソプロパノ-ル59部を加えて、固形分50%のリン酸基含有重合性モノマー溶液を得た。得られたモノマーの酸価は285mgKOH/gであった。
ステンレス製ビーカー内において、Xirallic T60-10WNTCrystal Silver(商品名,酸化チタン被覆酸化アルミニウムフレーク顔料,メルク社製)10部、リン酸基含有樹脂溶液8部(固形分4部)、2-エチル-1-ヘキサノール(20℃において100gの水に溶解する質量:0.1g)38.5部、及び2-(ジメチルアミノ)エタノール0.5部を均一に混合して、高濃度鱗片状光輝性顔料液を得た。
(メタリックベース塗料3の調製)
製造例2で得られたアクリル樹脂エマルション100部、製造例3で得られたポリエステル樹脂溶液57.1部、製造例9で得られた高濃度鱗片状光輝性顔料液を60.5部及びサイメル325(商品名、日本サイテックインダストリーズ社製、メラミン樹脂、固形分80%)37.5部を均一に混合し、さらに、プライマルASE-60(商品名、ロームアンドハース社製、ポリアクリル酸系増粘剤)、2-(ジメチルアミノ)エタノール及び脱イオン水を加えてpH8.0、塗料固形分25%、20℃におけるフォードカップNo.4による粘度40秒の水性塗料組成物を調製した。
ステンレス製ビーカー内において、アルミニウムペースト7640NS(商品名,アルミニウムフレーク顔料ペースト,東洋アルミ社製,固形分65質量%)15.4部(固形分10部)、リン酸基含有樹脂溶液8部(固形分4部)、2-エチル-1-ヘキサノール(20℃において100gの水に溶解する質量:0.1g)38.5部、及び2-(ジメチルアミノ)エタノール0.5部を均一に混合して、高濃度アルミニウム顔料液を得た。
製造例2で得られたアクリル樹脂エマルション100部、製造例3で得られたポリエステル樹脂溶液57.1部、製造例10で得られた高濃度アルミニウム顔料液を60.5部及びサイメル325(商品名、日本サイテックインダストリーズ社製、メラミン樹脂、固形分80%)37.5部を均一に混合し、さらに、プライマルASE-60(商品名、ロームアンドハース社製、ポリアクリル酸系増粘剤)、2-(ジメチルアミノ)エタノール及び脱イオン水を加えてpH8.0、塗料固形分25%、20℃におけるフォードカップNo.4による粘度40秒の水性塗料組成物を調製した。
前記「試験板の作製1」に記載の方法で前記鋼板に電着塗料を塗装して得られた塗膜を被塗物とする。当該被塗物に実施例29で調整した塗料組成物11をエアスプレーを使用して、硬化塗膜として25μmとなるように塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して140℃で30分間乾燥せしめて得られた塗膜上に、上記メタリックベース塗料3又は4を、硬化塗膜として15μmとなるようにエアスプレーを使用して塗装し、熱風乾燥炉を使用して80℃10分間加熱後に、トップクリヤー塗料(ルーガベーククリヤー、関西ペイント製、商品名、アクリル樹脂・アミノ樹脂系、有機溶剤型)をエアスプレーを使用して30μmとなるように塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して140℃で30分間乾燥せしめて試験板を調製した。得られた試験板について前述の「促進耐候性試験」に記載の方法で電着塗膜上のはがれの有無を評価したところ、はがれは観察されなかった。
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キシレン50部及び酢酸ブチル22部を仕込み、撹拌混合し、120℃に昇温した。次いで同温度に保持した反応容器内に、下記のモノマー/重合開始剤の混合物2を3時間かけて滴下し、滴下終了後1時間熟成を行なった。その後、キシレン10部及び2,2’-アゾビス(2-メチルプロピオニトリル)0.6部からなる混合物を同温度に保持しつつ1時間30分かけて滴下し、さらに2時間熟成して、水酸基価82mgKOH/g、数平均分子量20,000、樹脂固形分55%の水酸基含有アクリル樹脂2を得た。
モノマー/重合開始剤の混合物2:
メチルメタクリレ-ト27部、エチルアクリレート17部、n-ブチルアクリレート23部、ヒドロキシエチルメタクリレート19部、スチレン30部、アクリル酸1部及び2,2'-アゾビス(2-メチルプロピオニトリル)2.5部からなる混合物。
製造例11で得られた水酸基含有アクリル樹脂2を100部(固形分)、Tinuvin400(商品名、ヒドロキシフェニルトリアジン系紫外線吸収剤、チバスペシャリティケミカルズ社製)3部、Tinuvin292(商品名、光安定剤吸収剤、チバスペシャリティケミカルズ社製)1部及びモダフロー(商品名、表面調整剤、モンサント社製)0.1部を攪拌混合した後、スミジュールN3300(商品名、HDIイソシアヌレート3量体、住化バイエルウレタン社製)27部を配合して攪拌混合し、塗装に適した粘度に希釈してクリヤー塗料を調製した。
電着塗膜上に、塗料組成物1を硬化塗膜として25μmとなるようにエアスプレーを使用して塗装し、室温約20℃の実験室に15分放置した後に、上記メタリックベース塗料3又は4を、硬化塗膜として15μmとなるようにエアスプレーを使用して塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して140℃で30分間乾燥せしめてた、その後、上記2液型クリヤー塗料を硬化塗膜として30μmとなるようにエアスプレーを使用して塗装し、室温約20℃の実験室に15分放置した後に、温風乾燥機を使用して80℃で30分間乾燥せしめ、試験板を調整した。得られた試験板について前述の「促進耐候性試験」に記載の方法で電着塗膜上のはがれの有無を評価したところ、はがれは観察されなかった。
Claims (4)
- 塩素法酸化チタン顔料、黄色酸化鉄顔料、一次平均粒子径が15~80nmの範囲内であるカーボンブラック顔料及びビヒクル形成成分である樹脂組成物を含む塗料組成物であって、該塗料組成物を硬化塗膜として25μmとなるように塗装して得られた塗膜の波長420nm~480nmにおける光線透過率の平均値が0.1~1.0%である塗料組成物。
- 硬化塗膜として25μmとなるように塗装して得られた塗膜のL*a*b*表色系におけるL*値が80~95の範囲内、a*値が-2.0~2.0の範囲内であって且つb*値が0.1~5.0の範囲内である請求項1に記載の塗料組成物。
- 被塗物に請求項1又は2に記載された塗料組成物を塗装して得られた塗膜上に、カラーベース塗膜を形成する複層塗膜形成方法。
- カラーベース塗膜が、鱗片状光輝性顔料を含むメタリック塗料組成物を塗装して得られた塗膜と、トップクリヤー塗料を塗装して得られた塗膜を含むものである請求項3に記載の複層塗膜形成方法。
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