JPH0994527A - Manufacture of car body with pattern film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently manufacture a car body with a coating film combinedly having superior weather resistance and a pattern suitable for the taste of car users. SOLUTION: This manufacturing method for coating a car body with a pattern film formed by providing successively a primary coat film and an intercoat film on a base comprises a process of preliminarily setting the shape and coating color of a pattern to be coated on a computer, a process of providing a coating head with exclusive nozzles with respective very fine bores for at least three basic primary color coating materials of red, blue and yellow and forming a film of a given pattern set in the computer on an intercoat film by the spray coating carried out by an automatic coater operated by the computer control and a process of applying a clear coating material on the film with the pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an automobile body having a patterned coating film, which can efficiently form a coating film having a desired pattern and excellent weather resistance.

[0002]

2. Description of the Related Art Conventionally, automobile manufacturers have used several to several tens of different paint colors for each type of vehicle for top-coating an automobile body, and each paint line has its own dedicated paint pipe. Needs equipment. These pipes are sometimes connected to the paint booth from a storage tank several hundred meters away via a circulation device, so the higher the number of paint colors, the greater the initial investment in equipment and maintenance costs. Becomes In addition, these paint colors are usually developed every time a full model change or minor change of the car body is made.

[0003] Further, the demands on the paint color of the automobile body of automobiles (including motorcycles) are diversifying year by year, and automobile users, especially young people, are strongly demanded to have unique colors, patterns and marking designs. Especially in RV vehicles (recreational vehicles), the demand is strong. Also, in commercial vehicles such as mini buses, there is an increasing demand for differentiation by pattern painting such as company logos and product images. In order to respond to these trends, it has become an important issue to expand the range of designability by pattern painting.

Some automobile users apply an original seal or patch to the top coating film of the automobile body, or apply partial coating or pattern coating, but in any case, The weather resistance is inferior to that of the existing top coating film, or the level difference between the seal or patch and the existing top coating film deteriorates the cosmetic appearance.
Also, depending on the type of pattern, it is necessary to prepare many paint colors, but if there are not many paint colors, the color scheme and design are limited, and there is a limit to originality.

Further, it has been difficult in terms of productivity to coat an automobile body with a pattern of thousands or tens of thousands of types in order to meet the demands of end users by an automobile manufacturer.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present inventors
As a result of earnest research to obtain an automobile body that can efficiently produce an automobile body having a pattern that suits an automobile user's taste, and a coating film having the pattern is a film having excellent weather resistance, In order to complete the present invention, it was found that the above object can be achieved by setting a pattern on a computer, applying a pattern by an inkjet method with an automatic coating machine operated by computer control, and then applying a clear coating on the pattern. I arrived.

[0007]

That is, the present invention provides:
A method of manufacturing an automobile body, wherein a pattern coating film is formed on an automobile body in which an undercoat coating film and an intermediate coating film are sequentially formed on a substrate, which is (1) a shape of a pattern to be coated on a computer in advance. And the step of setting the paint color, (2)
A predetermined pattern set on a computer is provided by an automatic painting machine which has a painting head equipped with a dedicated nozzle of each small aperture for at least three basic primary color paints of red, blue and yellow, and which is operated by computer control. Provided is a method for producing an automobile body having a pattern coating film, which comprises a step of forming a film on the intermediate coating film by spray coating, and (3) a step of coating a clear coating film on the pattern coating film. To do.

[0008] The present invention also provides: The painting head is red,
The above-mentioned item 1 which is a coating head equipped with dedicated nozzles for three basic primary color paints of blue and yellow and at least one dedicated nozzle for at least one paint selected from black primary color paint, white primary color paint and bright pigment-containing paint. The manufacturing method described above is provided.

The present invention also relates to 3. The method according to item 1 or 2, wherein the base material is a metal base material or a chemical conversion treatment metal base material, and the undercoat coating film is an electrodeposition coating film.

The present invention also relates to 4. Paint the surface of the intermediate coating film, the L ^* a ^* b ^* method according to any one of the above items 1 to 3 L ^* value in the color system is equal to or is 5 or more It is provided.

The present invention also relates to 5. The intermediate coating film is a two-layer coating film formed from two kinds of coating materials, and provides the method for production according to any one of items 1 to 4 above.

The present invention also relates to 6. The clear coating material is a thermosetting acrylic resin clear coating material, and the manufacturing method according to any one of the above items 1 to 5 is provided.

The present invention also relates to 7. The above-mentioned items 1 to 6, wherein the paint for forming a pattern coating film applied by an automatic coating machine is a thermosetting paint, and after the clear coating material is applied, the pattern coating film and the clear coating film are simultaneously baked. The manufacturing method according to any one of 1.

The present invention also relates to 8. The clear coating composition contains an ultraviolet absorber, which provides the method for production according to any one of the above items 1 to 7.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a patterned coating film is formed on an automobile body in which an undercoat coating film and an intermediate coating film are sequentially formed on a substrate. The base material used can be used without limitation as long as it is a base material that can be used for automobile bodies,
For example, steel plate, aluminum plate, galvanized steel plate, iron-
Examples include metal base materials such as zinc alloy plated steel sheets, and chemical conversion treatment metal base materials obtained by subjecting these metal base materials to chemical conversion treatments such as chromate treatment, zinc phosphate treatment, iron phosphate treatment, plastics base materials such as FRP. be able to.

The undercoat coating film can be formed on the substrate by a known method such as spray coating, dip coating, brush coating or the like. In the case of a conductive base material such as a treated metal base material, it is preferable to form an electrodeposition coating film by using an electrocoating paint as the undercoat paint.

In order to form an electrodeposition coating film, the substrate may be immersed in an electrodeposition bath and electrodeposition coating may be performed by a known method. As the electrodeposition bath, any of known anion type electrodeposition bath and cation type electrodeposition bath can be used.

As the base resin component of the electrodeposition bath, for example,
Epoxy resin, acrylic resin, polybutadiene resin, alkyd resin, polyester resin, silicone resin, etc. 1
There can be mentioned one kind or two or more kinds. In the anion electrodeposition bath, the base resin component has an acid group such as a carboxyl group, and in the cation electrodeposition bath, the base resin component is an amino group; an onium base such as an ammonium group, a sulfonium group or a phosphonium group. It has a basic group of, and can be made aqueous by neutralizing and ionizing these groups.

The electrodeposition bath is preferably a cationic electrodeposition bath from the viewpoint of corrosion resistance, and of these, a polyamine resin represented by, for example, an amine-added epoxy resin as a base resin component is preferable.

When the base material is a metal base material or a chemical conversion treatment metal base material, when an undercoating coating film is formed by spray coating, an undercoating material with a focus on anticorrosive property, such as blending an anticorrosive pigment, is usually used. Is painted. As the resin, epoxy resin, polyester resin, alkyd resin, vinyl resin,
Acrylic resin is used.

When the substrate is a plastic substrate,
In general, since plastics have poor coating adhesion, a paint that can improve the adhesion of the intermediate coating when applied to the plastics surface is used as the undercoat paint. Examples of the resin of the undercoat paint include chlorinated polyolefin such as chlorinated polypropylene, polybutadiene, epoxy group-containing modified polybutadiene, carboxyl group-containing modified polybutadiene, polyurethane resin and acrylic resin.

The thickness of the undercoat coating film is usually 5 to 5 in terms of dry film thickness.
The thickness is 40 μm, preferably about 15 to 30 μm.

After undercoating, wash with water if necessary,
Then, after air-drying or curing by baking or the like, an intermediate coating material is applied. The intermediate coating may be any of water-based coating, organic solvent-based coating, and powder coating, and resin-based coating may be alkyd resin-based, polyester resin-based, acrylic resin-based, polyurethane resin-based, vinyl resin-based. It is possible to use various resin-based paints such as those of the system. Among them, the alkyd resin system is generally used.

The intermediate coating composition contains a pigment for the purpose of hiding the base material. Paint color intermediate coating, especially but not limited to, in view of viewability of the pattern formed on the intermediate coating ^{film, L * a * b * L} * values in a color system Is 5 or more, preferably 6 or more.

Curing of the intermediate coating material can usually be carried out by baking. When the intermediate coating material is applied while the electrodeposition coating film is uncured, the electrodeposition coating film is cured at the same time when the intermediate coating material is baked. The thickness of the intermediate coating is
The dry film thickness is usually 15 to 50 μm, preferably 20 to 40.
It is about μm.

The intermediate coating film may be composed of two layers, and the different functions can be shared by the respective layers. For example, the first layer has a high pigment concentration for the hiding property and the second layer has a low pigment. What emphasizes cosmeticity as the concentration,
In addition, the first layer may have a chipping resistance function, and the second layer may impart coating hardness, durability and the like.

In the method of the present invention, a coating film having a predetermined pattern preset in a computer is applied to a car body formed by sequentially forming the electrodeposition coating film and the intermediate coating film, in red, blue, and
Spray painting is carried out by an automatic painting machine which has a painting head equipped with dedicated nozzles of each small diameter for the three primary colors of yellow, and which is operated by computer control. Below, the coating method by an automatic coating machine with a coating head equipped with a special nozzle with a small diameter is called "inkjet method"
May be abbreviated.

When a predetermined pattern having a shape and a paint color to be painted is set in the computer in advance, the pattern having the shape and the paint color registered in the computer is selected in accordance with the user's request. Alternatively, the pattern may be set by causing the computer to read the pattern originally created by the user.

In the method of the present invention, the primary primary colors are
Red, blue, and yellow basic primary color paints are indispensable, and if necessary, at least one selected from primary color or mixed color paints other than the above basic primary colors such as black primary color and white primary color and paints containing bright pigments. Using the above paint, an ink jet system is instructed by a computer to sequentially coat the paint as required to give a desired color, which is then painted in a desired shape to form a pattern coating film.

The three basic primary colors are ideal, although the pure red, pure blue, and pure yellow paints can produce more paint colors, which is ideal. Since there is no color paint, paints in which pigments of colors close to these colors are dispersed are appropriately selected and used as the three basic primary colors.

The red pigments for the basic primary color red paint include lake red 4R, carmine FB, dinitroaniline orange, pyrazolone orange, pyrazolone red, perinone orange, permanent red 2B, lake red R, bon maroon light, bordeaux. 10B, Bon Maroon Medium, Thioindigo Bordeaux, Bon Maroon L, Perylene Vermillion, Perylene Scarlet, Perylene Maroon, Benzimidazolone Orange,
Examples include chrome vermillion molybdenum red, red iron oxide, toluidine red, and γ-quinacridone red.

Cyanine blue pigment blue 15 and 15:
1, the same 15: 2, the same 15: 3, the same 15: 4, metal-free cyanine blue, induslen blue, navy blue, ultramarine blue, cobalt blue and the like.

The yellow pigments for yellow paint, which is the basic primary color, include Shimura Yellow 3056, Fast Yellow G,
Monoazo pigments such as Fast Yellow 10G, Shimura Yellow 4119, Permanent Yellow FGL, and Benzimidazolone; Disazo yellow AAMX, Disazo Yellow AAOT, Disazo Yellow AAAA, Disazo Yellow AAA, Permanent Yellow HR, Lionol Yellow FFR, and other disazo pigments; Condensed azo pigments such as phthal yellow 3G, chromophthal yellow 6G, chromophthal yellow GR; irgadin yellow 3RLTN, irgadin yellow 2RLT, irgadin yellow 2GLT, fastgen super yellow G
Isoindolinone pigments such as ROH, Fastgen Super Yellow GRO and Sandrin Yellow 6GL; Slene pigments such as Anthrapyrimidine Yellow, Flavantron Yellow, Acylamino Yellow; Green Gold, Paliotor Yellow 1070, Paliotor Yellow 1770, Irga Metal complex pigments such as gin yellow 5GT; quinophthalone yellow, isoindoline yellow, yellow lead, yellow iron oxide, titanium yellow and the like.

The primary colors or mixed color paints other than the basic primary colors used as needed are primary color paints other than those selected as the basic primary colors, or mixed color paints. Examples of primary color paints other than red-based, blue-based, and yellow-based paints include black paints containing black pigments such as carbon black, pine smoke, graphite, iron black; titanium white, zinc white, antimony white, White paint containing white pigments such as lead white and monobasic lead sulfate; chrome green, cobalt green, chromium oxide, cyanine green, brominated green, cobalt chrome green, titanium nickel nickel cobalt zinc green Green paints that use green pigments such as
It can be a paint of various colors such as a cobalt-based violet, a manganese violet, a dioxazine violet, a β-type quinacridone violet, or a violet-based paint containing a violet-based pigment as a pigment component. The mixed color paint is a paint containing two or more of the above-mentioned basic primary color paints and pigments used in primary color paints other than the basic primary color paints.

Aluminum powder, bronze powder, copper powder, stainless steel powder, nickel powder, micaceous titanium foil, micaceous iron oxide foil, etc. are used as the brilliant pigment of the coating material containing the brilliant pigment, if necessary. be able to.

In the present invention, the coating head of the ink jet type automatic coating machine has dedicated nozzles for the three basic primary color paints of red, blue and yellow. Or, when a mixed color is used, it further has a nozzle for these paints. A large range of coating colors can be obtained with the three basic primary colors, but when the coating color on the surface of the intermediate coating is light or white, it is usually used for black paints in addition to the above three basic primary colors. It is preferable to provide a nozzle for a white paint when the coating color on the surface of the intermediate coating film is dark or the pattern coating film is light or white.
Further, by providing a nozzle for a coating material containing a bright pigment, the range of designability can be greatly expanded. In some cases, the range of coating colors can be expanded by additionally using dedicated nozzles for paints of primary colors or mixed colors other than the above basic primary colors.

The coating head equipped with these dedicated nozzles discharges the coating material from the dedicated nozzles by interlocking with an automatic coating machine that moves in a three-dimensional space that is a close distance from the three-dimensional object according to the position data. Then, the pattern coating film can be formed by appropriately coating the coating material as necessary. The coating time for pattern formation by the inkjet method varies depending on the type of pattern coating film and the coating area, but since an automatic coating machine (automatic robot) is used, continuous coating can be performed and productivity can be improved.

There are two types of paint atomization in the ink jet system, an air spray type using a micro two-fluid nozzle having a mechanism for suppressing spray diffusion, and an airless type using a single hole nozzle. It can be used properly depending on the size. In general, a single-hole nozzle is used to make the boundary line clear or a fine pattern is drawn, and a very small two-fluid nozzle is used to blur or paint a large area. In either case, the spray is turned on / off (on / off) mechanism of the on-demand system so that the coating material is discharged only to a necessary portion. In the inkjet method, the diameter of the nozzle having a small diameter is usually 20 μm to 0.8 mm, preferably 30 μm to 70 μm for a single-hole nozzle, and 0.2 to 0.5 mm for a micro two-fluid nozzle.

There are no particular restrictions on the resins of the paints containing the three basic primary colors, the bright pigment-containing paint, and the primary colors or mixed colors other than the above-mentioned basic primary colors, and various resins such as acrylic resin, alkyd resin and polyester resin can be used. It is possible to use a paint, which may be thermosetting, lacquer-curing or oxidation-curing. In the three basic primary colors, since the hiding property in a thin film is required, the pigment content ratio is generally high, and usually 30 to 150 parts by weight, preferably 50 to 1 part by weight of the pigment per 100 parts by weight of the resin.
It is in the range of 20 parts by weight.

In the method of the present invention, as the pattern coating film,
In addition to patterns with specific shapes and multicolor patterns, coatings with two-tone finish and full paint finish with one color are also included.

The ink jet system has a great advantage that the coating efficiency of the paint is close to 100% because the paint particles are sprayed on the object to be coated from a very short distance. It is possible to drastically reduce the running cost. However, since the number of times of recoating changes depending on the desired color, the film thickness in a small area tends to be different, and since the flying distance of the paint particles is short, the viscosity of the applied paint does not increase and it easily sags, which makes thick coating difficult. There's a problem.

Therefore, the pattern coating film is usually 1 to 10 μm.
Since it is a thin film with a thickness of about m, it is necessary to contain a large amount of pigment in order to conceal it with a thin film, so if it remains as it is, the gloss will be low and the appearance of the coated surface will deteriorate and the weather resistance and chemical resistance will decrease. Since this method is easy, in the method of the present invention, a clear paint is applied onto this patterned coating film to solve these problems.

As the clear paint, any clear paint having good weather resistance can be used without limitation, such as organic solvent type paint, water-based paint and powder paint. Various resins such as an acrylic resin, a polyester resin, an alkyd resin, a silicone resin, and a fluororesin can be used as the resin, and may be a thermosetting type or an active ray such as an ultraviolet ray or an electron beam. May be cured. As the clear coating, those used as the top clear coating for automobiles are preferably used, and among them, the acrylic resin type thermosetting clear coating is suitable.

The clear coating composition may be applied after the pattern coating film is cured. However, when the clear coating composition is a thermosetting type, the pattern coating film is air-dried and then uncured. It is preferable to apply a clear paint and then heat it to bake the pattern coating film and the clear coating film at the same time from the viewpoints of interlayer adhesion between the pattern coating film and the clear coating film, reduction of heating energy amount, and the like. Further, the clear paint may contain an ultraviolet absorber in order to improve weather resistance. The clear paint may be applied only on the portion having the pattern, but it is preferable to apply it on the entire surface on which the intermediate coating is applied.

[0045]

EXAMPLES The present invention will be described more specifically with reference to examples.

Example 1 A cation-type electrodeposition paint "Electron GT-10" (manufactured by Kansai Paint Co., Ltd.) was electrodeposited on an automobile body made of a cold-rolled steel sheet having a thickness of 0.5 mm, and baked to a thickness of about 1. A 22 μm electrodeposition coating film was formed. On this electrodeposition coating, an intermediate coating of polyester / melamine resin "ES Primer TP-37 White" (manufactured by Kansai Paint Co., Ltd.) is electrostatically spray-coated and baked as an intermediate coating to an intermediate coating of a thickness of about 30 μm. A film was formed. The L ^* value of the surface coating color of the intermediate coating film was about 8.

Next, a specific picture and character are set in the computer in advance, and an automatic coating machine controlled by the computer and operated [KER42 manufactured by Kobe Steel, Ltd.
[0]], a total of four acrylic resin-based primary colors of three primary colors of red, blue, yellow, and black are used, and a head having four dedicated nozzles for these primary colors is used for intermediate coating. The above-mentioned specific pattern and characters were drawn on the film and baked. Two types of heads were used, one having a dedicated single-hole nozzle and the other having a dedicated extremely small two-fluid nozzle, and the distance between the nozzle during coating and the surface to be coated was about 3 cm. Next, organic solvent-diluted thermosetting acrylic resin-based clear paint "Majicron clear" is applied on the intermediate coating film, picture and letters.
(Manufactured by Kansai Paint Co., Ltd.) is coated by a rotary electrostatic coating machine and baked to form a clear coating film having a film thickness of about 35 μm, and a coated article having a pattern, characters and a clear coating film on the intermediate coating film is formed. Created.

Among the above four primary colors, the pigment type in the red primary color is γ-type quinacridone red, and the P / B ratio [weight ratio of the amount of pigment to the resin solid content] is 1.0. The pigment type in the blue primary color is cyanine blue pigment blue 15: 4, and the P / B ratio is 1.0. The pigment type for the yellow primary color is Irgadine Yellow 2RLT and the P / B ratio is 1.0. The pigment type in the black primary color is carbon black, and the P / B ratio is 0.3.

Example 2 In Example 1, a white primary color was used instead of a black primary color as a primary color for forming a pattern coating film, and an aqueous thermosetting acrylic resin-based clear coating "instead of Magiclon Clear was used as a clear coating. Asuka Bakekuriya "(manufactured by Kansai Paint Co., Ltd.)
A coated article was prepared in the same manner as in Example 1 except that was used. The pigment type in the white primary color is titanium white, and P /
The B ratio is 1.8.

Example 3 In Example 1, as a primary color for forming a pattern coating film, an acrylic resin primary color which is a basic primary color of only three colors of red, blue and yellow was used without using a black primary color, and a clear paint was used. A coated article was prepared in the same manner as in Example 1 except that a thermosetting acrylic resin-based powder clear paint clear "Evaclad 5000 clear" (manufactured by Kansai Paint Co., Ltd.) was used instead of Magicron clear.

Example 4 In Example 1, an ultraviolet-curable unsaturated polyester resin-based clear coating "Sonne Topcoat W2000 Clear" (manufactured by Kansai Paint Co., Ltd.) was used as the clear coating instead of Magicron clear. A coated article was prepared in the same manner as in Example 1 except that ultraviolet rays were applied instead of baking to cure.

Example 5 In Example 1, the ES primer T was used as the intermediate coating material.
Instead of forming an intermediate coating film using P-37 White, a maleic acid-modified polyolefin resin-based coating material "Universal Primer UN" is used as the first intermediate coating material.
-3 "(manufactured by Kansai Paint Co., Ltd.) is electrostatically coated and baked to a dry film thickness of about 8 μm, and then, as the second intermediate coating material, Amylak White (manufactured by Kansai Paint Co., Ltd.). Amino alkyd resin-based paint) was electrostatically coated so that the dry film thickness was about 30 μm and baked to form a two-layer intermediate coating film, to prepare a coated article in the same manner as in Example 1.

Example 6 Instead of forming the cationic electrodeposition coating film on the automobile body in Example 1, the conductive primer "Soflex 2510C" is applied to the FRP plate (fiber reinforced plastics plate).
D "(manufactured by Kansai Paint Co., Ltd.) is coated and baked to form a conductive primer coating film, and instead of drawing a specific pattern and letters, only the pattern is used, and only a head having a dedicated micro two-fluid nozzle as a coating head A coated article was prepared in the same manner as in Example 1 except that the painted article was used.

Example 7 In Example 1, after drawing a picture and characters with a coating machine, setting and air-drying, Majicron clear was coated on this and baked to simultaneously cure the picture, characters and clear coating film. A coated article was prepared in the same manner as in Example 1 except for the above.

Example 8 In Example 1, instead of Magiclon Clear as the clear coating material, the UV absorber 2 was added to Magiclon Clear.
A coated article is prepared in the same manner as in Example 1 except that a clear coating material containing 1 part by weight of (2′-hydroxy-5-methylphenyl) benzotriazole is added to 100 parts by weight of the resin solid content. did.

Ninth Embodiment In the first embodiment, a particular picture and character set in advance in a computer have the same shape but have a partial metallic feeling. The paint used for painting is five kinds of paints of four primary colors and paint containing a bright pigment, and any of a painting head having a dedicated single-hole nozzle and a painting head having a dedicated miniature two-fluid nozzle. A coated article was prepared in the same manner as in Example 1 except that the head had five dedicated nozzles. The bright pigment-containing paint is
In the acrylic resin liquid, "Alpaste 1100NA" (aluminum powder paste manufactured by Toyo Aluminum Co., Ltd.) has a P / B ratio of [amount (part by weight) to resin solid content (part by weight)] of 0.4. It is a coating material containing an organic solvent type bright pigment dispersed as described above.

Comparative Example 1 A coated article was prepared in the same manner as in Example 1 except that the specific pattern and characters were painted and baked, and then the clear paint was not painted.

The coated articles obtained in Examples 1 to 9 and Comparative Example 1 were tested for finished appearance and weather resistance. The test results are shown in Table 1 below.

Test method Finished appearance: The smoothness, sharpness and color tone of the coated surface of the coated article were comprehensively evaluated according to the following criteria.

◎: Very good ○: Good Δ: A little inferior ×: Inferior Weather resistance: Accelerated baculo test on a coated article having the same pattern and shape of characters using an accelerated weather resistance tester manufactured by Q Panel Co. I went. The test conditions are (UV irradiation 16 hours /
A test was performed for 3000 hours (125 cycles) with a cycle of 60 hours at 60 ° C. and water condensation of 8 hours / 50 ° C.) for 24 hours, and the degree of discoloration and gloss change of the coated surface was visually evaluated according to the following criteria.

Amount of discoloration ⊚: Almost no discoloration is observed ∘: Slight discoloration is recognized, but there is no problem in practical use Δ: Significant discoloration is recognized ×: Significant discoloration is recognized Gloss change ◎: Almost Maintains the same gloss as in the initial stage. O: Slight decrease in gloss is observed, but there is no problem in practical use. Δ: Significant decrease in gloss is recognized. X: Significant decrease in gloss is recognized.

[0062]

[Table 1]

In Examples 1 to 9, the combination of the pattern coating film and the clear paint of different types showed an excellent finished appearance although there was a slight difference in the finished appearance. Example 8 using the clear coating containing the ultraviolet absorber was the most excellent in terms of discoloration due to bakuro. Further, Comparative Example 1 in which the clear paint was not applied was inferior in finished appearance (especially gloss) and weather resistance.

[0064]

According to the present invention, when the method of the present invention is carried out in a coating line of an automobile manufacturer, only standard colors are required for the piping equipment for supplying paint, so that equipment costs and maintenance costs are greatly reduced. Furthermore, by reducing the number of paint colors to be prepared, process management and paint management will be simplified, and the labor cost required for that will be greatly reduced. In addition, since the topcoat enamel coating process, which had to use an air spray coating machine with low coating efficiency in order to impart designability, was omitted, running costs for supply / exhaust equipment and wastewater treatment in the coating line were also eliminated. It can be drastically reduced.

If a dealer is provided with a coating facility for forming the pattern coating film so that the dealer can form the pattern coating film, it becomes easy to finely meet the demands of the end user, and the originality according to the user's preference can be obtained. It is possible to easily create an automobile body having a patterned coating film with a color.

In the method of the present invention, by applying a clear paint on the pattern paint film to provide a clear paint film, a smooth surface appearance of the paint film can be obtained, and there is a feeling of depth and excellent weather resistance. A coated film can be obtained.

As described above, according to the present invention, it is possible to save the labor of the coating line of the automobile manufacturer, to meet various painting appearance requirements of end users of the automobile, and to improve the painting efficiency in the pattern painting. It is possible to realize a method for manufacturing an automobile body that is friendly to the global environment.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location B05D 7/24 302 B05D 7/24 302P 303 303A

Claims (8)

[Claims] 1. A method of manufacturing an automobile body, wherein a pattern coating film is formed on an automobile body in which an undercoat coating film and an intermediate coating film are sequentially formed on a base material. And (2) having a coating head equipped with a dedicated nozzle with a small aperture for each of the three primary primary color paints of red, blue and yellow,
And a step of forming a coating film having a predetermined pattern set in the computer by spray coating on the intermediate coating film by an automatic coating machine operated by computer control, and (3) applying clear coating on the pattern coating film A method of manufacturing an automobile body having a patterned coating film, comprising the steps of: 2. The coating head is dedicated to each dedicated nozzle of three primary primary color paints of red, blue and yellow, and at least one type of coating selected from black primary color paints, white primary color paints and bright pigment-containing paints. The manufacturing method according to claim 1, wherein the coating head is equipped with a nozzle. 3. The method according to claim 1, wherein the base material is a metal base material or a chemical conversion treatment metal base material, and the undercoat coating film is an electrodeposition coating film. 4. The coating color of the surface of the intermediate coating film is L ^* a ^* b.
^* L ^* value in a color system is 5 or more, The manufacturing method as described in any one of Claims 1-3 characterized by the above-mentioned. 5. The intermediate coating film is a two-layer coating film formed of two kinds of coating materials, wherein the intermediate coating film is a two-layer coating film.
The production method according to any one of the above. 6. The manufacturing method according to claim 1, wherein the clear paint is a thermosetting acrylic resin clear paint. 7. A paint for forming a pattern coating film applied by an automatic coating machine is a thermosetting paint, and after the clear coating material is applied, the pattern coating film and the clear coating film are simultaneously baked. The manufacturing method according to claim 1. 8. The manufacturing method according to claim 1, wherein the clear paint contains an ultraviolet absorber.