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WO2013039066A1 - Procédé de formation de film de revêtement double couche et film de revêtement double couche - Google Patents

Procédé de formation de film de revêtement double couche et film de revêtement double couche Download PDF

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Publication number
WO2013039066A1
WO2013039066A1 PCT/JP2012/073196 JP2012073196W WO2013039066A1 WO 2013039066 A1 WO2013039066 A1 WO 2013039066A1 JP 2012073196 W JP2012073196 W JP 2012073196W WO 2013039066 A1 WO2013039066 A1 WO 2013039066A1
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Prior art keywords
coating film
base
paint
coating
film
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PCT/JP2012/073196
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English (en)
Japanese (ja)
Inventor
小島　圭介
孝昌 青木
孝則 橋本
小川　剛志
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本田技研工業株式会社
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Application filed by 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to BR112014005780A priority Critical patent/BR112014005780A2/pt
Priority to CN201280044666.6A priority patent/CN103796764B/zh
Priority to JP2013533673A priority patent/JP5881719B2/ja
Publication of WO2013039066A1 publication Critical patent/WO2013039066A1/fr

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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
    • 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

Definitions

  • the present invention relates to a method of forming a multilayer coating and a multilayer coating. More particularly, the present invention relates to a method of forming a multilayer coating for an automobile body and a multilayer coating.
  • a middle coat coating process for example, a baking process, a top coat base coating process, a preheating process, a top coat clear coating process and a baking process on an object to which electrodeposition coating as an undercoat is applied.
  • a multilayer coating film is formed.
  • the shielding effect by the inorganic ultraviolet shielding agent largely varies depending on the hue, and in particular, the shielding effect to light rays of colors having high brightness is low. Therefore, it was easy to transmit the light ray of the color with high brightness through the coating, and it was not possible to sufficiently suppress the deterioration and the peeling at the interface between the top coat and the undercoat.
  • the light shielding effect per unit amount of the inorganic ultraviolet shielding agent is not sufficient, and when the content is increased, the content of other components such as a pigment decreases, There was a risk of impairing the curability.
  • a base coating film that expresses a hue has a place where the pigment concentration greatly varies depending on the hue (for example, 40 parts by mass or more is required for high brightness white, and 20 parts by mass or less for low brightness black)
  • the pigment concentration in the base coating remains the same despite the elimination of the middle coat coating. Therefore, since the pigment concentration in the base coating film is largely different depending on the hue, the stress propagation property to an impact received from the outside, that is, the chipping resistance largely varies depending on the hue.
  • the stress input from the outside can not be dispersed, and problems such as exfoliation of the coating film and exposure of the substrate occur to obtain excellent coating film performance regardless of the hue. I could not.
  • the present invention has been made in view of the above, and the object thereof is to suppress deterioration and peeling at the interface between the top coat film and the under coat film sufficiently even if the middle coat coating is abolished, regardless of the hue.
  • An object of the present invention is to provide a technology capable of obtaining excellent coating film performance.
  • the pigment concentration of the first base coating film after baking and curing becomes 40 to 60 mass% and the film thickness becomes 20 ⁇ m or more
  • the first base paint is applied to form the first base paint film
  • the second base paint film forming step the film thickness of the second base paint film after baking and curing becomes 8 ⁇ m or more.
  • the second base paint is applied to form a second base coating.
  • a second base coating formation step of forming a second base coating on the first base coating is set to 40 to 60% by mass
  • the film thickness is set to 20 ⁇ m or more
  • the film thickness of the second base coating film is set to 8 ⁇ m or more.
  • a base coating film which develops a hue is divided into two layers, and a first base coating film having a high pigment concentration is formed in a lower layer of the second base coating film with a predetermined film thickness or more secured.
  • the method for forming a multilayer coating film according to the present invention further comprises a baking step of baking and curing the first base coating film and the second base coating film simultaneously, and the first base paint and the second base paint. It is preferable to use a combination in which the first base paint has a lower curing temperature than the second base paint.
  • the first base coating and the second base coating are formed using a combination in which the first base coating has a lower curing temperature than the second base coating, and the first base coating and the second base are formed.
  • the coating is simultaneously baked and cured.
  • curing of the second base coating is initiated prior to curing of the first base coating at the time of simultaneous printing, curing has already started along with curing shrinkage of the first base coating A distortion occurs in the second base coating film, causing a problem that the smoothness of the multilayer coating film is impaired.
  • the curing of the second base coating film is started after the curing of the first base coating film is started. The smoothness of the film can be improved, and the gloss as an appearance characteristic can be improved.
  • the clear paint is a coating film more than the second base paint at the curing temperature of the second base paint. It is preferred to use a combination having a low viscosity.
  • the second base coating film and the clear coating film are formed using a combination in which the clear coating composition has a lower viscosity than the second base coating composition at the curing temperature of the second base coating composition.
  • the viscosity of the clear coating film is lower than that of the second base coating film at the curing temperature of the second base paint, so that the mixed layer between the second base coating film and the clear coating film can be suppressed.
  • curing strain stress in the coating film shrinkage direction which occurs at the time of curing shrinkage of the second base coating film, and it is possible to suppress the curing strain from remaining in the coating film.
  • the gloss as the appearance characteristic can be improved, and simultaneously with the input of external stress such as chipping, the curing strain remaining in the coating film can be released and peeling can be suppressed.
  • the present invention also provides a multilayer coating film formed by the method for forming a multilayer coating film described above.
  • the same effect as the method of forming a multilayer coating film described above can be obtained.
  • the present invention it is possible to sufficiently suppress the deterioration and peeling at the interface between the top coat film and the under coat film even if the middle coat coating is abolished, and a technology capable of obtaining excellent coat film performance regardless of paint color. Can be provided.
  • FIG. 6 is a view showing the relationship between the temperature and the viscosity of each paint used in Example 3.
  • FIG. 2 is a view showing the relationship between the temperature and the viscosity of each paint used in Example 1;
  • the first base paint, the second base paint, and the clear paint are sequentially applied on the substrate to which the electrodeposition coating has been applied, and then they are simultaneously baked and cured. As a result, the first base coating, the second base coating and the clear coating are formed.
  • the multilayer coating film which concerns on this embodiment is a multilayer coating film formed by such a formation method.
  • the formation method of the multilayer coating film which concerns on this embodiment has a 1st base coating film formation process, a 2nd base coating film formation process, and a clear coating film formation process.
  • a drying step of drying the coating film is included between the second base coating film forming step and the clear coating film forming step. Later, it has the baking process which bakes and hardens the 1st base coat, the 2nd base coat, and the clear coat simultaneously.
  • the first base coating is formed on the substrate to which the electrodeposition coating has been applied by coating the first base coating.
  • a substrate to which electrodeposition coating has been applied an automobile body to which cationic electrodeposition coating has been applied is preferably applied.
  • a water-soluble paint or a water-dispersible paint such as an emulsion containing a resin component and a pigment component can be used.
  • the resin component one containing a polyester resin, an acrylic resin, a urethane resin or the like as a main component is used.
  • the pigment component general-purpose color pigments and extender pigments are used. Examples of color pigments include white pigments such as titanium oxide, black pigments such as carbon black, yellow pigments such as ocher, red pigments such as red iron oxide and anthraquinone, blue pigments such as phthalocyanine blue, green pigments such as phthalocyanine green and the like Can be mentioned.
  • the extender pigment include inorganic pigments such as barium sulfate, calcium carbonate, kaolin and silicate (talc).
  • the first base paint may contain an organic solvent and various additives as needed.
  • the first base coating material in which the pigment concentration of the first base coating film after baking and curing is 40 to 60% by mass is used.
  • the lower limit value of the pigment concentration of the first base coating film after baking and curing is 40 to 60% by mass.
  • the first base coating film is coated by applying the first base paint so that the film thickness of the first base coating film after baking and curing becomes 20 ⁇ m or more.
  • the lower limit value of the film thickness of the first base coating film after baking and curing is set to 20 ⁇ m, it is possible to reliably block light rays of colors with high brightness and sufficiently suppress deterioration and peeling at the interface with the electrodeposition coating film.
  • the upper limit of the film thickness is preferably 40 ⁇ m from the viewpoint of avoiding the occurrence of sagging after coating and the reduction of the finished appearance.
  • a first base paint whose curing temperature is lower than the curing temperature of the second base paint described later is used. That is, when simultaneously baking and curing the first base coating film and the second base coating film, the first base coating film is set to be cured prior to the second base coating film.
  • “hardening temperature” means the temperature at which the drop in viscosity stops and increases while the temperature is rising. Specifically, it is measured by a dynamic viscoelasticity measuring device.
  • the second base coating film is formed on the first base coating film to form a second base coating film.
  • the second base paint is applied wet on wet on the first base coating film.
  • the second base paint as in the first base paint, it is possible to use a water-soluble paint or a water-dispersible paint such as an emulsion, which contains a resin component and a pigment component.
  • a resin component one containing a polyester resin, an acrylic resin, a urethane resin or the like as a main component is used as in the first base coating film.
  • the resin does not have to be the same as the resin of the first base coating film.
  • the pigment component various color pigments and extender pigments described above are used as in the first base coating film.
  • the second base coating film plays a role of color development, and a glitter pigment can be used in addition to the above-mentioned color pigment.
  • the bright pigment those generally blended in automobile outer plate paints such as aluminum flakes, mica, mica flakes, glass flakes and the like can be mentioned.
  • the second base paint may contain an organic solvent and various additives as necessary.
  • the second base coating is applied to form a second base coating so that the film thickness of the second base coating after baking and curing becomes 8 ⁇ m or more.
  • the corrosion resistance after chipping can be improved by setting the lower limit value of the film thickness of the second base coating film after baking and curing to 8 ⁇ m.
  • the upper limit of the film thickness is preferably 25 ⁇ m from the viewpoint of avoiding the occurrence of sagging after coating and the reduction in the finished appearance.
  • a drying step of drying the coating is provided between the second base coating forming step and the clear coating forming step. This drying step removes the solvent components in the first base coating and the second base coating.
  • a clear coating film is formed by applying a clear paint on the second base coating film.
  • a clear paint a general purpose water-based paint for automobile exterior can be used.
  • the curing mechanism include acrylic-melamine curing, carboxylic acid-glycidyl curing, hydroxyl group- (block) isocyanate curing and the like.
  • the clear paint can be used either as a one-part or two-part mixed paint.
  • the one-component paint is preferable from the viewpoint of ease of handling in a car coating line because it is inexpensive and there is no restriction such as pot life.
  • the clear paint may contain an organic solvent and various additives as needed.
  • a clear paint having a viscosity lower than that of the second base paint is used at the curing temperature of the second base paint. That is, when the second base coating film and the clear coating film are simultaneously baked and cured, the viscosity of the clear paint is set to be lower than the viscosity of the second base paint.
  • a baking step in which the first base coating film, the second base coating film and the clear coating film are simultaneously baked and cured.
  • the baking conditions are appropriately set according to the types of the first base paint, the second base paint and the clear paint.
  • the formation method of the multilayer coating film which concerns on this embodiment forms a 1st base coating film which forms a 1st base coating film on an electrodeposition coating film as a base coating film formation process instead of abolishing middle coat coating.
  • a step of forming a second base coating film on the first base coating film is provided. Further, the pigment concentration of the first base coating film is set to 40 to 60% by mass, the film thickness is set to 20 ⁇ m or more, and the film thickness of the second base coating film is set to 8 ⁇ m or more.
  • the base coating film that develops the hue is divided into two layers, and the first base coating film having a high pigment concentration is formed in the lower layer of the second base coating film with a predetermined film thickness or more secured.
  • the intermediate coating is abolished, deterioration and peeling at the interface with the electrodeposition coating can be sufficiently suppressed, and excellent coating performance can be obtained regardless of the hue.
  • the first base coating and the second base coating are formed using a combination in which the first base coating has a lower curing temperature than the second base coating, and the first base coating and the second base coating are formed.
  • the base coating is simultaneously baked and cured.
  • curing of the second base coating is initiated prior to curing of the first base coating at the time of simultaneous printing, curing has already started along with curing shrinkage of the first base coating A distortion occurs in the second base coating film, causing a problem that the smoothness of the multilayer coating film is impaired.
  • the curing of the second base coating film is started after the curing of the first base coating film is started.
  • the smoothness of the coating film can be improved, and the gloss as an appearance characteristic can be improved.
  • the second base coating film and the clear coating film are formed using a combination in which the clear coating composition has a lower viscosity than the second base coating composition at the curing temperature of the second base coating composition.
  • the viscosity of the clear coating is lower than that of the second base coating at the curing temperature of the second base coating, so that the mixed layer between the second base coating and the clear coating can be suppressed.
  • the gloss as the appearance characteristic can be improved, and simultaneously with the input of external stress such as chipping, the curing strain remaining in the coating film can be released and peeling can be suppressed.
  • the same effect as the above-described method for forming a multilayer coating film can be obtained.
  • the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like as long as the object of the present invention can be achieved are included in the present invention.
  • the first base coating, the second base coating and the clear coating are simultaneously baked and cured, but the present invention is not limited thereto.
  • Example 1 Preparation of first base paint
  • a water-based paint for automobiles (“Aquarex” (registered trademark) manufactured by Nippon Paint Co., Ltd.)
  • titanium oxide (CR-90” (registered trademark) manufactured by Ishihara Sangyo Co., Ltd.) as a pigment component in advance 0.56 parts by mass of carbon black (“FW 200" (registered trademark) manufactured by Evonik Tegsa Co., Ltd.) and 17.05 parts by mass of talc (manufactured by Nippon Talc Co., Ltd. "SG-95” (registered trademark)
  • FW 200 registered trademark
  • talc manufactured by Evonik Tegsa Co., Ltd.
  • SG-95 registered trademark
  • Example 1 a urethane emulsion resin (17.92 parts by mass of “U-Coat UX-310” manufactured by Sanyo Chemical Industries, Ltd., and 9.76 parts by mass of a polyester resin (“HMP 27” manufactured by Mitsui Chemicals, Inc.) are added and sufficiently stirred As a result, the first base paint of Example 1 was obtained in which the pigment concentration in the coating film after baking and curing was adjusted to 40 parts by mass.
  • the first base paint prepared in the present example was spray-coated on a steel plate previously subjected to cationic electrodeposition coating so that the film thickness after baking and curing was 20 ⁇ m.
  • the second base paint prepared in the present example was spray-coated by wet on wet so that the film thickness of the coating after baking and curing was 8 ⁇ m.
  • the film is allowed to stand for 5 minutes in a drying oven at 80 ° C. for drying, and then allowed to cool to room temperature, and then the clear paint (“Macflow O100” manufactured by Nippon Paint Co., Ltd.) is baked and the film thickness after curing is It spray-coated so that it might be set to 30 micrometers.
  • the multilayer coating film of Example 1 was obtained by standing for 30 minutes in a drying oven at 140 ° C. and simultaneously baking and curing the first base coating film, the second base coating film, and the clear coating film. .
  • Example 2 [Formation of multilayer coating film]
  • the multilayer coating of Example 2 is carried out by performing the same operation as in Example 1 except that the first base paint prepared in Example 1 is spray-coated so that the film thickness after baking and curing becomes 23 ⁇ m. I got a membrane.
  • Comparative Example 1 [Formation of multilayer coating film] The multilayer coating of Comparative Example 1 is carried out by carrying out the same operation as in Example 1 except that the first base paint prepared in Example 1 is spray-coated so that the film thickness after baking and curing becomes 15 ⁇ m. I got a membrane.
  • Comparative Example 2 [Preparation of first base paint] To the first base paint prepared in Example 1, a water-based paint for automobiles not containing a pigment ("Aquarex” (registered trademark) manufactured by Nippon Paint Co., Ltd.) is blended, and a urethane emulsion resin (SANYO Kasei Co., Ltd.) 22.23 parts by mass of “U-Coat UX-310” manufactured by Co., Ltd. and 12.1 parts by mass of a polyester resin (“HMP 27” manufactured by Mitsui Chemicals, Inc.) were sufficiently stirred. Thereby, the 1st base paint of comparative example 2 adjusted so that the pigment concentration in the coating film after bake-hardening might be 35 mass parts was obtained.
  • Aquarex registered trademark
  • a urethane emulsion resin SANYO Kasei Co., Ltd. 22.23 parts by mass of “U-Coat UX-310” manufactured by Co., Ltd.
  • HMP 27 manufactured by Mitsui Chemicals
  • a multilayer paint of Comparative Example 2 is carried out by carrying out the same operation as in Example 1 except that the first base paint prepared in this Comparative Example is used instead of the first base paint prepared in Example 1. I got a membrane.
  • Comparative Example 3 [Formation of multilayer coating film] The multilayer coating film of Comparative Example 3 is carried out by performing the same operation as in Example 1 except that the second base paint prepared in Example 1 is spray-coated so that the film thickness after baking and curing becomes 5 ⁇ m. I got
  • the chipping resistance of the multilayer coatings obtained in Examples 1 and 2 and Comparative Examples 1 to 3 was evaluated. Specifically, the evaluation was performed according to the following procedure. First, the multilayer coating films of each of the Examples and Comparative Examples, which had been cooled to -20.degree. C. in advance, were set at positions where the shot materials hit at an angle of 90.degree. With a gravelometer tester according to JASO M104. As a shot material, 50 g of crushed stone No. 7 for road was used, and shot with an air pressure of 2 kgf / cm 2 . After completion of the test, the multilayer coating was taken out and the broken coating and the portion of the coating floating were removed. Thereafter, using a loupe or the like, the amount of peeling of the coating film and the amount of exposure of the steel plate were visually evaluated.
  • the exposure of the steel plate was evaluated in the following five grades in the order from the one with the least exposure: ⁇ (less exposure), ((less exposure), ((more exposure slightly), x (more exposure), and x (excessive) .
  • the multilayer coating film after shot is left to stand in a salt water sprayer for 24 hours in accordance with JIS Z 2371, and in 50 mm x 50 mm squares where scratches are concentrated, the number of rusted areas is measured did.
  • the chipping resistance is evaluated as ⁇ with good chipping resistance and as ⁇ with poor chipping resistance. did. The results are shown in Table 1.
  • the film thickness of the first base coating film is 15 ⁇ m and is thin and is outside the range (20 ⁇ m or more) of the present invention
  • the pigment concentration in the first base coating film is 35 parts by mass and the present invention is small
  • Comparative Example 2 which is out of the range (40 to 60 parts by mass)
  • Comparative Example 3 in which the film thickness of the second base coating film is 5 ⁇ m and thin and outside the range of the present invention (8 ⁇ m or more)
  • the exposure of the coating film peeling and the steel plate was small, and it was determined that the chipping resistance was good.
  • the chipping resistance is excellent by setting the pigment concentration of the first base coating film to 40 to 60 mass%, setting the film thickness to 20 ⁇ m or more, and setting the film thickness of the second base coating film to 8 ⁇ m or more. It was confirmed that sex was obtained.
  • Example 3 [Preparation of first base paint] By replacing all the melamine resin components in the first base paint prepared in Example 1 with a completely methylated melamine resin (“Cymel 303” (registered trademark) manufactured by Nippon Cytech Industries, Ltd.), the third of Example 3 was obtained. 1 base paint was prepared. As a result, the curing temperature of the first base paint of this example was lower than the curing temperature of the second base paint (second base paint of Example 1) used in this example.
  • a completely methylated melamine resin (“Cymel 303” (registered trademark) manufactured by Nippon Cytech Industries, Ltd.
  • the clear paint of Example 3 was prepared by adding 1.2 parts by mass of dimethylethanolamine to the clear paint ("Macflow O100" manufactured by Nippon Paint Co., Ltd.) used in Example 1.
  • the viscosity of the clear paint of this example is the same as that of the second base paint used in this example (Example 1) Lower than the viscosity of the second base paint).
  • the curing temperature of the first base paint is lower than the curing temperature of the second base paint
  • the viscosity of the clear paint at the curing temperature of the second base paint is lower than the viscosity of the second base paint
  • Example 3 in which the steel plate was exposed was less than in Example 1, and it was confirmed that the chipping resistance was improved.
  • the Wa on the coating film surface was large and somewhat glossy
  • the Wa on the coating film surface was small and gloss It was confirmed that the closing was slight.
  • the boundary between the first base coating film and the second base coating film is clearer in Example 3 than in Example 1. That was confirmed.
  • FIG. 1 is a view showing the relationship between temperature and viscosity of each paint used in Example 3
  • FIG. 2 is a view showing the relationship between temperature and viscosity of each paint used in Example 1.
  • the horizontal axis represents temperature (° C.)
  • the vertical axis represents the viscosity (Pa ⁇ s) of each paint.
  • the viscosity of each paint was measured using a dynamic viscoelasticity measuring apparatus ("Rheosol-G5000" manufactured by UBM), using a parallel plate having a diameter of 25 mm and a gap of 1 mm, a frequency of 1.6 Hz, and an angular amplitude of 8.23 deg. It means the complex viscosity measured when the temperature is raised from 25 ° C. to 140 ° C. in 10 minutes.
  • Example 3 the curing temperature of the first base paint is lower than the curing temperature of the second base paint, and the viscosity of the clear paint at the curing temperature of the second base paint is the second base paint. It was confirmed to be lower than the viscosity of On the other hand, as is clear from FIG. 2, in Example 1, the curing temperature of the first base paint is higher than the curing temperature of the second base paint, and the viscosity of the clear paint at the curing temperature of the second base paint is the second It was confirmed to be higher than the viscosity of the base paint.
  • Example 4 [Preparation of first base paint] While replacing all melamine resin components in a water-based paint for automobiles ("Aquarex” (registered trademark) made by Nippon Paint Co., Ltd.) with a completely methylated melamine resin ("Cymel 303" (registered trademark) made by Nippon Cytech Industries, As a pigment component, 13.16 parts by mass of titanium oxide (“CR-90” (registered trademark) manufactured by Ishihara Sangyo Co., Ltd.) and 0. 4 of carbon black (“FW 200" (registered trademark) manufactured by Evonik Tegsa Co., Ltd.). 13 parts by mass and 6.11 parts by mass of talc (Nippon Talc Co., Ltd.
  • Example 4 (registered trademark)) were mixed to adjust the brightness of the coating after baking and curing to 50 to 60. .
  • a urethane emulsion resin (17.92 parts by mass of “U-Coat UX-310” manufactured by Sanyo Chemical Industries, Ltd., and 9.76 parts by mass of a polyester resin (“HMP 27” manufactured by Mitsui Chemicals, Inc.) are added and sufficiently stirred As a result, the first base paint of Example 4 was obtained, which was adjusted so that the pigment concentration in the coating film after baking and curing was 40 parts by mass.
  • Example 5 [Preparation of second base paint]
  • a urethane emulsion resin ("U-coat UX-310" manufactured by Sanyo Chemical Industries, Ltd.) is 14.36 against a water-based paint for automobiles ("Aquarex R540P” manufactured by Nippon Paint Co., Ltd.) registered in red in advance. After adding by mass, the second base paint of Example 5 was obtained by sufficiently stirring.
  • Example 6 [Preparation of second base paint]
  • a urethane emulsion resin ("U-Coat UX-310" manufactured by Sanyo Kasei Co., Ltd.) is 14.36 against a water-based paint for automobiles ("Aquarex B 548 P” (registered trademark) manufactured by Nippon Paint Co., Ltd.) previously adjusted to blue. After adding by mass, the second base paint of Example 6 was obtained by sufficiently stirring.
  • Example 7 [Preparation of first base paint] While replacing all melamine resin components in a water-based paint for automobiles ("Aquarex” (registered trademark) made by Nippon Paint Co., Ltd.) with a completely methylated melamine resin ("Cymel 303" (registered trademark) made by Nippon Cytech Industries, By blending 26.19 parts by mass of titanium oxide (“CR-90” (registered trademark) manufactured by Ishihara Sangyo Co., Ltd.) as a pigment component in advance, the brightness of the coating film after baking and curing becomes 80 to 90. It was adjusted.
  • CR-90 registered trademark
  • Example 7 a urethane emulsion resin (17.92 parts by mass of “U-Coat UX-310” manufactured by Sanyo Chemical Industries, Ltd., and 9.76 parts by mass of a polyester resin (“HMP 27” manufactured by Mitsui Chemicals, Inc.) are added and sufficiently stirred As a result, the first base paint of Example 7 was obtained, which was adjusted so that the pigment concentration in the coating film after baking and curing was 47.4 parts by mass.
  • a urethane emulsion resin ("U-Coat UX-310" manufactured by Sanyo Kasei Co., Ltd.) is 14.36 against a water-based paint for automobiles ("Aquarex NH578" manufactured by Nippon Paint Co., Ltd.) which has been previously adjusted to white. After addition by mass, the second base paint of Example 7 was obtained by sufficiently stirring.
  • the silver multi-layer coating film of Example 4 As shown in Table 3, the silver multi-layer coating film of Example 4, the red multi-layer coating film of Example 5, the blue multi-layer coating film of Example 6, the white multi-layer coating of Example 7 It was found that all of the films had the same chipping resistance as the black multilayer coating of Example 3. From this result, it was confirmed that excellent coating film performance can be obtained regardless of the hue by the method of forming a multilayer coating film according to the present invention.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un procédé de formation de film de revêtement double couche par lequel une détérioration ou une exfoliation à une interface entre un film de revêtement final et un film de sous-couche peut être limitée même sans un revêtement de surface et une performance de revêtement peut être améliorée indépendamment d'une couleur. La présente invention comprend une étape de formation de premier film de revêtement de base dans laquelle un premier film de revêtement de base est formé par revêtement d'une cible de revêtement électrodéposée avec une première matière de revêtement de base, une étape de formation de second film de revêtement de base dans laquelle un second film de revêtement de base est formé par revêtement du premier film de revêtement de base avec une seconde matière de revêtement de base, et une étape de formation de film de revêtement transparent dans laquelle un film de revêtement transparent est formé par revêtement du second film de revêtement de base avec une matière de revêtement transparent. Dans l'étape de formation de premier film de revêtement de base, le premier film de revêtement de base est formé par revêtement de la première matière de revêtement de base de telle sorte qu'une concentration de pigment du premier film de revêtement de base après un durcissement par cuisson est de 40 % en poids à 60 % en poids et une épaisseur de film est d'au moins 20 µm. Dans l'étape de formation de second film de revêtement de base, le second film de revêtement de base est formé par revêtement de la seconde matière de revêtement de base de telle sorte que l'épaisseur de film du second film de revêtement de base après le durcissement par cuisson est d'au moins 8 µm.
PCT/JP2012/073196 2011-09-13 2012-09-11 Procédé de formation de film de revêtement double couche et film de revêtement double couche WO2013039066A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
BR112014005780A BR112014005780A2 (pt) 2011-09-13 2012-09-11 método de formação de película de revestimento de múltiplas camadas e película de revestimento de múltiplas camadas
CN201280044666.6A CN103796764B (zh) 2011-09-13 2012-09-11 多层涂膜的形成方法和多层涂膜
JP2013533673A JP5881719B2 (ja) 2011-09-13 2012-09-11 複層塗膜の形成方法及び複層塗膜

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CN105358259A (zh) * 2013-07-01 2016-02-24 本田技研工业株式会社 涂装设备和涂装方法
JP2021079338A (ja) * 2019-11-19 2021-05-27 トヨタ自動車東日本株式会社 複層塗膜の形成方法及び複層塗膜
WO2022054709A1 (fr) * 2020-09-14 2022-03-17 日本ペイント・オートモーティブコーティングス株式会社 Film de revêtement multicouches et procédé de formation de film de revêtement multicouches

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CN107286724B (zh) * 2017-07-06 2020-06-05 观致汽车有限公司 一种汽车涂层结构

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JP2021079338A (ja) * 2019-11-19 2021-05-27 トヨタ自動車東日本株式会社 複層塗膜の形成方法及び複層塗膜
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