WO2025009066A1 - 紫外線硬化型塗料を用いた塗装方法及び積層塗膜 - Google Patents

紫外線硬化型塗料を用いた塗装方法及び積層塗膜 Download PDF

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WO2025009066A1
WO2025009066A1 PCT/JP2023/024794 JP2023024794W WO2025009066A1 WO 2025009066 A1 WO2025009066 A1 WO 2025009066A1 JP 2023024794 W JP2023024794 W JP 2023024794W WO 2025009066 A1 WO2025009066 A1 WO 2025009066A1
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Prior art keywords
ultraviolet
coating film
coating
paint
cured
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PCT/JP2023/024794
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English (en)
French (fr)
Japanese (ja)
Inventor
洋一 吉岡
康弘 福山
透 小瀬村
康介 手塚
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Priority to PCT/JP2023/024794 priority Critical patent/WO2025009066A1/ja
Priority to JP2025530861A priority patent/JPWO2025009066A1/ja
Publication of WO2025009066A1 publication Critical patent/WO2025009066A1/ja
Anticipated expiration legal-status Critical
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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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • 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

Definitions

  • the present invention relates to a coating method and multilayer coating film using ultraviolet-curing paint.
  • Patent Document 1 In order to change the appearance of a floor surface, a surface modification structure is known in which an adhesive coating, a mark-containing layer, and a top coating are laminated on the surface (Patent Document 1).
  • the problem that this invention aims to solve is to provide a coating method and multilayer coating that can ensure both gloss and adhesion using the same material.
  • the present invention solves the above problem by applying an ultraviolet-curable paint to the target coating surface, irradiating with ultraviolet light to form a first cured coating layer with a porosity of P1 % or a surface roughness Rz of R1 ⁇ m, and then applying a solvent-containing ultraviolet-curable paint to the surface of this first cured coating layer and irradiating with ultraviolet light to form a second cured coating layer with a porosity of P2 % (where P2 ⁇ P1 ) or a surface roughness Rz of R2 ⁇ m (where R2 ⁇ R1 ).
  • the first cured coating layer ensures adhesion, while the second cured coating layer ensures gloss.
  • FIG. 1 is a configuration diagram showing an example of an inkjet coating device used in a coating method using an ultraviolet-curable coating material according to the present invention.
  • FIG. FIG. 1 is a configuration diagram showing an example of a coating system used in a coating method using an ultraviolet curing paint according to the present invention.
  • FIG. 2 is a cross-sectional view of a coating film for explaining the mechanism of formation of a first cured coating film layer (matte coating film) and a second cured coating film layer (glossy coating film) according to the present invention.
  • 1 is a cross-sectional view of a coating film showing one embodiment of a coating method using an ultraviolet-curable coating material according to the present invention.
  • the coating method of this embodiment is a coating method using an ultraviolet-curing paint, and in particular, is a coating method that controls the gloss and unevenness of the dried coating surface depending on the drying method of the wet coating film of the applied ultraviolet-curing paint.
  • the coating method of this embodiment is not particularly limited, but can be applied to the coating process of automobile parts such as the outer and inner panels of an automobile body and bumpers.
  • the ultraviolet-curable paint used in the coating method of this embodiment may be a paint prepared by blending a known ultraviolet-curable resin composition with, as necessary, a colorant and known paint additives (for example, antifoaming agents such as silicone oil, fluorine-based surfactants, silicone-based surfactants, leveling agents such as acrylic copolymers, thickeners, viscosity reducers, etc.)
  • UV-curable resin compositions are broadly classified into ultraviolet radical-curable resin compositions and cation-curable resin compositions, and either type of ultraviolet-curable resin composition may be used in the coating method of this embodiment.
  • the ultraviolet-curable resin composition contains an ultraviolet-curable monomer or prepolymer and a photoradical polymerization initiator.
  • an ultraviolet-curable monomer or prepolymer a monomer or prepolymer having multiple ethylenically unsaturated groups in the molecule, or a mixture thereof, is used.
  • Representative examples include epoxy acrylate resin, urethane acrylate resin, thermosetting acrylic resin, and thermosetting polyester resin.
  • Typical photoradical polymerization initiators used in combination with UV-curable monomers or prepolymers include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and other benzoin and its alkyl ethers; acetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 1,1-dichloroacetophenone, 1-hydroxycyclohexyl phenyl ketone, and 2-hydroxycyclohexyl phenyl ketone.
  • acetophenones such as 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-propan-1-one; anthraquinones such as 2-methylanthraquinone and 2-amylanthraquinone; thioxanthones such as 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, 2-chlorothioxanthone, and 2,4-diisopropylthioxanthone; ketals such as acetophenone dimethyl ketal and benzyl dimethyl ketal; benzophenones or xanthones such as benzophenone; etc.
  • Such photoradical polymerization initiators are generally used in a ratio of 0.1 to 30 parts by weight, and particularly 1 to 25 parts by weight, per 100 parts by weight of the above-mentioned UV-curable resin component.
  • at least one type of well-known and commonly used photopolymerization accelerator such as a benzoic acid type or a tertiary amine type, can also be used in combination with the photoradical polymerization initiator.
  • a cationic curable resin composition contains an ultraviolet curable epoxy resin as the resin component and a cationic ultraviolet polymerization initiator as the photopolymerization initiator.
  • UV-curable epoxy resins contain an epoxy resin component that has an alicyclic group in the molecule and adjacent carbon atoms of the alicyclic group form an oxirane ring, and for example, epoxy compounds having at least one epoxycycloalkane group in the molecule, such as an epoxycyclohexane ring or an epoxycyclopentane ring, are used alone or in combination.
  • UV-curable epoxy resins are vinylcyclohexene diepoxide, vinylcyclohexene monoepoxide, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carboxylate, 2-(3,4-epoxycyclohexyl-5,5-spiro-3,4-epoxy)cyclohexane-m-dioxane, bis(3,4-epoxycyclohexyl)adipate, limonene dioxide, etc.
  • the cationic ultraviolet polymerization initiator used in combination with the above-mentioned epoxy resin is decomposed by ultraviolet light to release a Lewis acid, which acts to polymerize the epoxy group.
  • Suitable examples include aromatic iodonium salts, aromatic sulfonium salts, aromatic selenium salts, aromatic diazonium salts, etc.
  • an air atomizing paint spray gun When applying the ultraviolet curing paint to the target surface, an air atomizing paint spray gun, a rotary atomizing paint gun (a so-called bell-shaped paint gun), or a so-called inkjet applicator (a machine that prints by ejecting minute droplets of ink from a thin nozzle onto paper) can be used.
  • Inkjet applicators have a significantly smaller amount of paint dust than air atomizing paint spray guns and rotary atomizing paint guns, so they have the advantage of significantly improving the efficiency of paint use and significantly improving the working environment.
  • FIG. 1 is a diagram showing the configuration of one embodiment of an inkjet coater 1 used in a coating method using an ultraviolet-curable paint according to the present invention.
  • the inkjet coater 1 according to this embodiment is widely known as an "inkjet coater," so in this specification, the term “ink” will be used.
  • this ink actually means “paint for automobile painting” (the ultraviolet-curable paint described above).
  • the inkjet coating device 1 of this embodiment includes a nozzle 11 having an inlet 111 for the paint 2, a paint chamber 112, and a discharge portion 113 for the paint 2, a needle 12 having at least a tip portion 121 disposed in the paint chamber 112 and capable of reciprocating in the axial direction Y toward the discharge portion 113, an actuator 13 that moves the needle 12 back and forth in the axial direction Y so that the tip portion 121 approaches the discharge portion 113 when the needle 12 advances and moves away from the discharge portion 113 when the needle 12 retreats, a pressure sensor 14 that detects the pressure of the paint 2 in the paint chamber 112, and a control unit 15 that controls the actuator 13.
  • the nozzle 11 has a hollow housing 114 made of a metal, resin or ceramic material, with an inlet 111 formed on one side and an outlet 113 at the tip, and a paint chamber 112 formed inside. Paint 2 is introduced from the inlet 111 into the paint chamber 112, and is ejected (dribbled) from the outlet 113 to the outside by being pushed by the needle 12.
  • the inside of the housing 114 is partitioned liquid-tightly into the paint chamber 112 and the actuator chamber 115 by a seal member 123.
  • the needle 12 is a needle-shaped rod made of metal, resin, or ceramic material, with a tip 121 disposed in the paint chamber 112 and a base 122 disposed in the actuator chamber 115, with a seal member 123 provided therebetween.
  • the actuator 13 is fixed to the base 122 of the needle 12.
  • the needle 12 is provided within the housing 114 so that it can move back and forth in the axial direction Y.
  • the actuator 13 is, for example, a stack of multiple piezoelectric elements, and has the property of expanding and contracting in the axial direction Y according to the voltage applied to the electrodes.
  • the application of voltage to the actuator 13 is executed by the control unit 15, and by applying a voltage to the actuator 13 according to a command signal from the control unit 15, the needle 12 can be moved forward and backward in the axial direction Y.
  • the stroke start position of the needle 12, etc. may be controlled based on the pressure of the paint 2 in the paint chamber 112 detected by the pressure sensor 14.
  • the paint 2 in this embodiment is the ultraviolet-curing paint described above, which is stored in a paint tank 21 in a state where it has been adjusted to an appropriate viscosity, and is supplied by a paint pump 23 via a paint piping 22. It is also possible to provide a paint piping that returns the paint 2 introduced into the paint chamber 112 of the nozzle 11 to the paint tank 21, so that the paint 2 is circulated and supplied.
  • FIG 2 is a configuration diagram showing an example of a coating system used in the coating method using the ultraviolet-curable paint according to the present invention.
  • the coating system of this embodiment includes the inkjet coating device 1 described with reference to Figure 1, an ultraviolet irradiator 4 that irradiates ultraviolet light onto a wet coating film 25 of the ultraviolet-curable paint applied to the coating surface 3, a laser displacement meter 5 that measures the thickness of the wet coating film 25, a heater 6 that heats the wet coating film 25 applied to the coating surface 3, and a controller 7 that controls the ultraviolet irradiator 4, the laser displacement meter 5, and the heater 6.
  • FIG. 2 shows an example of an inkjet coating device 1 in which four nozzles 11 are provided for a target coating surface 3.
  • a plane parallel to the coating surface 3 is the X-Y plane and an axis perpendicular to the X-Y plane is the Z axis
  • the four nozzles 11 are arranged in parallel along the Y axis direction, and the four nozzles 11 drop droplets 24 of paint 2 onto the coating surface 3 while moving in a direction (X axis direction) perpendicular to the direction in which the nozzles 11 are arranged (Y axis direction), thereby forming four rows of wet coating films 25 on the surface of the coating surface 3.
  • the distance between two adjacent nozzles 11 is set to a distance roughly equivalent to one droplet 24 of paint 2, and as shown in FIG. 2, the droplets 24 of paint 2 dropped from the four nozzles 11 form an uninterrupted wet coating film 25 on the coating surface 3.
  • an inkjet coating device 1 including four nozzles 11 is given as an example, but an appropriate number of nozzles 11 can be arranged in parallel depending on the size of the coating surface 3.
  • paint 2 droplets 24 of paint 2, wet coating film 25, and cured coating film 26 are used as different technical terms. That is, the liquid material from the paint tank 21 until it is attached to the coating surface 3 is collectively referred to as paint 2, and the granular liquid material from the discharge part 113 of the nozzle 11 until it is attached to the coating surface 3 is referred to as droplets 24 of paint 2.
  • the liquid or semi-cured film from when the droplets 24 of paint 2 are attached to the coating surface 3 until they are cured by ultraviolet light irradiation is referred to as wet coating film 25, and the coating film formed by curing the wet coating is referred to as cured coating film 26.
  • the ultraviolet irradiator 4 is installed after the application process of ultraviolet curing paint. For convenience, one ultraviolet irradiator 4 is shown in FIG. 2, but when the workpiece has a large surface area 3 to be coated, such as an automobile body or automobile part, multiple ultraviolet irradiators 4 may be installed inside a tunnel-type furnace, such as a paint drying furnace for baked curing paint, and ultraviolet rays may be irradiated while the automobile body or automobile part is being transported.
  • the ultraviolet irradiator 4 controls the ultraviolet irradiation intensity and irradiation time by control signals from the controller 7.
  • the laser displacement meter 5 irradiates the surface of the wet coating film 25 applied by the inkjet coating device 1 with laser light, and measures the film thickness of the wet coating film 25 in real time by detecting the displacement from the state before application.
  • the detected displacement of the wet coating film 25 is output to the controller 7, which calculates the wet coating film 25.
  • the controller 7 then outputs a control signal to the ultraviolet irradiator 4 according to the calculated film thickness of the wet coating film 25. For example, the controller 7 outputs a control signal to the ultraviolet irradiator 4 to increase the ultraviolet irradiation intensity or lengthen the irradiation time as the film thickness of the wet coating film 25 increases.
  • the heater 6 is a heating means for heating the wet coating film 25 applied to the application surface 3, and is arranged on the back side of the application surface 3 as well as near the wet coating film 25 as shown in the figure.
  • heat emitted from the ultraviolet irradiator 4 may be used.
  • the heater 6 of this embodiment or the ultraviolet irradiator 4 instead is provided to evaporate the volatile solvent contained in the wet coating film 25 before curing the wet coating film 25 by irradiating it with ultraviolet light.
  • the technical significance of evaporating the volatile solvent contained in the wet coating film 25 before curing the wet coating film 25 of the ultraviolet curing paint by ultraviolet light irradiation will be explained.
  • general ultraviolet curing paint contains a volatile solvent to increase the dispersibility of the resin component and the photopolymerization initiator, and evaporates before and after curing by ultraviolet light.
  • Figure 3 is a cross-sectional view of a coating film to explain the mechanism of formation of the first cured coating film layer (matte coating film) and the second cured coating film layer (glossy coating film) according to the present invention.
  • the cross-section of a coating film in which the volatile solvent contained in the wet coating film 25 of the ultraviolet-curable paint applied to the coating surface 3 is dried over time and then irradiated with ultraviolet light to form a cured coating film 26 is shown in steps ST1 ⁇ ST2 ⁇ ST3
  • the cross-section of a coating film in which the volatile solvent contained in the wet coating film 25 of the ultraviolet-curable paint applied to the coating surface 3 is irradiated with ultraviolet light while drying to form a cured coating film 26 is shown in steps ST1 ⁇ ST4 ⁇ ST5.
  • step ST1 of Figure 3 when an ultraviolet-curable paint is applied to the coating surface 3 to form a wet coating film 25, and then left for a sufficiently long time at room temperature as shown in step ST2, the volatile solvent slowly evaporates before the resin components inside the wet coating film 25 harden, so there is almost no stirring inside the coating film.
  • the resin components are photo-cured after the volatile solvent has evaporated, so a cured coating film 26 with a smooth surface and a glossy finish is obtained as shown in step ST3.
  • the cured coating film 26 obtained in this manner is also called the second cured coating film layer 262 or glossy coating film.
  • step ST1 of FIG. 3 when an ultraviolet-curing paint is applied to the coating surface 3 to form a wet coating film 25, the wet coating film 25 is heated by a heater 6 as shown in step ST4, and the volatile solvent inside the wet coating film 25 evaporates rapidly, causing an agitation phenomenon inside the coating film.
  • the volatile solvent evaporates while the resin component is photocured, and as shown in step ST5, a cured coating film 26 with an uneven surface and no gloss is obtained.
  • the wet coating film 25 is cured by ultraviolet light while the volatile solvent is evaporated by the heat of an ultraviolet irradiator 4 instead of the heater 6, an agitation phenomenon occurs inside the wet coating film 25, and a cured coating film 26 with an uneven surface and no gloss is obtained as shown in steps ST4 and ST5.
  • the cured coating film 26 with an uneven surface and no gloss obtained in this manner is also called the first cured coating film layer 261 or matte coating film.
  • the matte coating film is also called a matte coating film.
  • the coating method of this embodiment is characterized by using the stirring phenomenon that occurs during the evaporation of the volatile solvent of the ultraviolet-curing paint to coat the second cured coating film layer 262, which has a smooth and glossy surface as shown in steps ST2 to ST3 (where stirring phenomenon is not generated), and the first cured coating film layer 261, which has an uneven and non-glossy surface as shown in steps ST4 to ST5 (where stirring phenomenon is generated).
  • the surface of the first cured coating film layer 261 which has an uneven and non-glossy surface, has a large surface area of the adhesive interface and can be expected to have an anchor effect, so by laminating the second cured coating film layer 262 on the surface of this first cured coating film layer 261, the adhesion between the first cured coating film layer 261 and the second cured coating film layer 262 is enhanced.
  • the outermost layer is the smooth and glossy second cured coating film layer 262, a smooth and glossy coating film can be provided as the final laminated coating film.
  • the second cured coating film layer 262 (glossy coating film) having a smooth and glossy surface as shown in step ST3 refers to a cured coating film 26 with a surface roughness (ten-point average roughness Rz according to the Japanese Industrial Standards) of less than 0.1 ⁇ m, a porosity of 0 to 20%, and a glossiness (20° specular glossiness according to the Japanese Industrial Standards) of 90 or more.
  • the surface roughness Rz in this embodiment refers to the ten-point average roughness defined in Japanese Industrial Standard JIS B 0601, which is calculated by extracting only a reference length from the roughness curve in the direction of the average line, measuring from the average line of this extracted portion in the direction of the longitudinal magnification, and calculating the sum of the average of the absolute values of the elevations (Yp) of the five highest peaks and the average of the absolute values of the elevations (Yv) of the five lowest valleys, and expressing this value in micrometers ( ⁇ m).
  • the porosity in this embodiment refers to the percentage of the area of voids (voids, etc.) per unit area of the cross section of the cured coating film 26. This porosity can be obtained by enlarging the cross section of the cured coating film 26 and measuring the area of the voids visually, etc.
  • the gloss level in this embodiment is a numerical representation of the intensity ratio between incident light and specularly reflected light when an object is irradiated with light, and refers to the 20° specular gloss level measured in accordance with the Japanese Industrial Standards - Specular Gloss Measurement Method (JIS Z8741-1997).
  • the gloss level can be measured, for example, with a gloss measuring device (MICRO-GLOSS, manufactured by BYK Gardner).
  • the first cured coating film layer 261 which has an uneven and non-glossy surface as shown in step ST5 refers to a cured coating film 26 with a surface roughness (ten-point average roughness Rz according to the Japanese Industrial Standards) of 0.1 to 10 ⁇ m, a porosity of 30 to 50%, and a glossiness (20° specular glossiness according to the Japanese Industrial Standards) of 10 or less.
  • the coating method of this embodiment includes a first step of applying an ultraviolet-curable paint to a target coating surface 3 to form a wet coating film 25, irradiating the wet coating film 25 with ultraviolet light to form a first cured coating film layer 261 having a porosity of P 1 % or a surface roughness Rz of R 1 ⁇ m, and a second step of applying an ultraviolet-curable paint to the surface of the first cured coating film layer 261 to form a wet coating film 25, and irradiating the wet coating film 25 with ultraviolet light to form a second cured coating film layer 262 having a porosity of P 2 % (where P 2 ⁇ P 1 ) or a surface roughness Rz of R 2 ⁇ m (where R 2 ⁇ R 1 ).
  • a second cured coating film layer 262 having a relatively small porosity or surface roughness Rz is formed on this surface.
  • Figure 4 is a cross-sectional view of a coating film showing one embodiment of a coating method using an ultraviolet-curable coating material according to the present invention.
  • an ultraviolet-curing paint is applied to the coating surface 3 to form a wet coating film 25 with a predetermined thickness.
  • the predetermined thickness in this case is not particularly limited, but is, for example, 5 to 50 ⁇ m.
  • ultraviolet rays are irradiated to the wet coating film 25 in a state in which the amount of evaporation of the volatile solvent contained in the wet coating film 25 is less than a predetermined value, in other words, in a state in which the volatile solvent is sufficiently contained, so that the wet coating film 25 applied to the coating surface 3 becomes a first cured coating film layer 261 (matte coating film) with no gloss.
  • the wet coating film formed on the coating surface 3 is irradiated with ultraviolet rays without being subjected to heat treatment, or is irradiated with ultraviolet rays after being subjected to a short heat treatment less than the first predetermined time.
  • the time from the formation of the wet coating film 25 to the irradiation of infrared rays is not set long.
  • a stirring phenomenon occurs when the resin component of the wet coating film 25 is photocured by irradiation of infrared rays, and as shown in the following step ST13, a first cured coating film layer 261 (matte coating film) with an uneven surface is obtained.
  • an ultraviolet-curing paint is applied to the surface of the first cured coating layer 261 to form a wet coating film 25 with a predetermined thickness.
  • the predetermined thickness in this case is not particularly limited, but is, for example, 5 to 50 ⁇ m.
  • ultraviolet rays are irradiated to the wet coating film 25 in a state in which the amount of evaporation of the volatile solvent contained in the wet coating film 25 is equal to or greater than a predetermined value, in other words, in a state in which the volatile solvent is hardly contained, so that the wet coating film 25 applied to the surface of the first cured coating layer 261 becomes the glossy second cured coating layer 262 (glossy coating).
  • the wet coating film formed on the coating surface 3 is subjected to a long heat treatment for a first predetermined time or more and then irradiated with ultraviolet rays, or ultraviolet rays are irradiated after a time exceeding a predetermined time after the application of the ultraviolet-curing paint.
  • the time from the formation of the wet coating film 25 to the irradiation of infrared rays is set to be long.
  • no stirring occurs when the resin component of the wet coating film 25 is photocured by infrared irradiation, and as shown in the subsequent step ST16, a second cured coating film layer 262 (glossy coating film) with a smooth surface is obtained.
  • the laminated coating film is composed of two layers, the first cured coating film layer 261 and the second cured coating film layer 262, but the laminated coating film may be composed of three or more layers. That is, although not shown, an ultraviolet-curable paint is applied to the target coating surface 3 to form a wet coating film 25, which is then irradiated with ultraviolet light to form a first cured coating film layer having a porosity of P1 % or a surface roughness Rz of R1 ⁇ m.
  • an ultraviolet-curable paint is applied to the surface of this first cured coating film layer to form a wet coating film 25, which is then irradiated with ultraviolet light to form a second cured coating film layer having a porosity of P2 % (where P2 ⁇ P1 ) or a surface roughness Rz of R2 ⁇ m (where R2 ⁇ R1 ).
  • an ultraviolet-curable paint is applied to the surface of this second cured coating layer to form a wet coating film 25, which is then irradiated with ultraviolet light to form a third cured coating layer having a porosity of P3 % (where P3 ⁇ P2 ) or a surface roughness Rz of R3 ⁇ m (where R3 ⁇ R2 ).
  • this process can be repeated.
  • the coating method using ultraviolet-curable paint of this embodiment includes first steps ST11 to ST13 of applying ultraviolet-curable paint to the target coating surface 3 and irradiating ultraviolet light to form a first cured coating layer 261 having a porosity of P 1 % or a surface roughness Rz of R 1 ⁇ m, and second steps ST14 to ST16 of applying ultraviolet-curable paint to the surface of the first cured coating layer 261 and irradiating ultraviolet light to form a second cured coating layer 262 having a porosity of P 2 % (where P 2 ⁇ P 1 ) or a surface roughness Rz of R 2 ⁇ m (where R 2 ⁇ R 1 ). Therefore, by using ultraviolet-curable paint of the same material, adhesion can be ensured by the first cured coating layer 261 and gloss can be ensured by the second cured coating layer 262.
  • the first cured coating layer 261 has a porosity of 30-50% and a surface roughness Rz of 0.1-10 ⁇ m, while the second cured coating layer 262 has a porosity of 0-20% and a surface roughness Rz of less than 0.1 ⁇ m. Therefore, by using the same material of the ultraviolet-curable paint, the first cured coating layer 261 can ensure adhesion, while the second cured coating layer 262 can ensure gloss.
  • the ultraviolet-curable paint used in the first process and the ultraviolet-curable paint used in the second process are supplied from the same paint supply system (paint tank 21, paint piping 22, and paint pump 23), which reduces equipment costs.
  • ultraviolet rays are irradiated when the amount of evaporation of the solvent contained in the wet coating film 25 applied to the coating surface 3 is less than a predetermined value
  • ultraviolet rays are irradiated when the amount of evaporation of the solvent contained in the wet coating film 25 applied to the surface of the first cured coating film layer 261 is equal to or greater than the predetermined value. Therefore, by using ultraviolet-curing paint of the same material, it is possible to further ensure adhesion through the first cured coating film layer 261 and gloss through the second cured coating film layer 262.
  • the wet coating film 25 is irradiated with ultraviolet light without being subjected to heat treatment so that the amount of evaporation of the solvent contained in the wet coating film 25 applied to the coating surface 3 is less than a predetermined value, or the wet coating film 25 is irradiated with ultraviolet light after being subjected to heat treatment for less than a first predetermined time, so that the first cured coating film layer 261 can be generated more reliably.
  • the wet coating 25 applied to the surface of the first cured coating layer 261 is subjected to a heat treatment for a first predetermined time or more before being irradiated with ultraviolet light so that the amount of evaporation of the solvent contained in the wet coating 25 applied to the surface of the first cured coating layer 261 is equal to or greater than a predetermined value, or ultraviolet light is irradiated after a time exceeding a second predetermined time has elapsed since the application of the ultraviolet-curing paint, so that the second cured coating layer 262 can be generated more reliably.
  • a first step is performed in which an ultraviolet-curable paint is applied to a target coating surface, and ultraviolet light is irradiated to form a first cured coating layer having a porosity of P 1 % or a surface roughness Rz of R 1 ⁇ m;
  • a second step is performed in which an ultraviolet-curable paint is applied to the surface of the first cured coating layer, and ultraviolet light is irradiated to form a second cured coating layer having a porosity of P 2 % (provided that P 2 ⁇ P 1 ) or a surface roughness Rz of R 2 ⁇ m (provided that R 2 ⁇ R 1 );
  • a third step is performed in which an ultraviolet-curable paint is applied to the surface of the second cured coating layer, and ultraviolet light is irradiated to form a second cured coating layer having a porosity of P 3 % (provided that P 3 ⁇ P 2 ) or a surface roughness R

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PCT/JP2023/024794 2023-07-04 2023-07-04 紫外線硬化型塗料を用いた塗装方法及び積層塗膜 Ceased WO2025009066A1 (ja)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005007277A (ja) * 2003-06-18 2005-01-13 Sumitomo Bakelite Co Ltd プラスチックシートの製造方法
JP2006030548A (ja) * 2004-07-15 2006-02-02 Nec Corp 光学基板、発光素子、表示装置およびそれらの製造方法
WO2006062214A1 (ja) * 2004-12-08 2006-06-15 Nippon Steel Corporation プレコート金属板およびプレコート金属板の製造方法
JP2009532572A (ja) * 2006-04-06 2009-09-10 ピーピージー インダストリーズ オハイオ インコーポレーテツド 耐摩耗性コーティング組成物およびコーティングされた物品
WO2017195697A1 (ja) * 2016-05-13 2017-11-16 旭硝子株式会社 映像投影用構造体、透明スクリーン、および映像投影用構造体の製造方法
JP2021137990A (ja) * 2020-03-03 2021-09-16 凸版印刷株式会社 化粧シート、化粧板及び化粧シートの製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005007277A (ja) * 2003-06-18 2005-01-13 Sumitomo Bakelite Co Ltd プラスチックシートの製造方法
JP2006030548A (ja) * 2004-07-15 2006-02-02 Nec Corp 光学基板、発光素子、表示装置およびそれらの製造方法
WO2006062214A1 (ja) * 2004-12-08 2006-06-15 Nippon Steel Corporation プレコート金属板およびプレコート金属板の製造方法
JP2009532572A (ja) * 2006-04-06 2009-09-10 ピーピージー インダストリーズ オハイオ インコーポレーテツド 耐摩耗性コーティング組成物およびコーティングされた物品
WO2017195697A1 (ja) * 2016-05-13 2017-11-16 旭硝子株式会社 映像投影用構造体、透明スクリーン、および映像投影用構造体の製造方法
JP2021137990A (ja) * 2020-03-03 2021-09-16 凸版印刷株式会社 化粧シート、化粧板及び化粧シートの製造方法

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