JP3259073B2 - Method of manufacturing automobile body having patterned coating film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, an automobile manufacturer uses several to several tens of paint colors for the top coat of an automobile body depending on a vehicle type, and each paint line has a dedicated paint pipe corresponding to the number of paint colors used. Needs equipment. Since these pipes are connected to the painting booth via a circulating device from a storage tank that may be several hundred meters away, the capital and maintenance costs that are initially invested as the number of paint colors increase are enormous. Becomes Furthermore, these paint colors are usually developed every time a full model change or minor change of the car body is made.

[0003] In addition, automobile (including motorcycle) users' requirements for paint colors of automobile bodies are diversifying year by year. Particularly, automobile users, mainly young people, are strongly required to have unique colors, patterns and marking designs. In particular, in the case of an RV (recreational vehicle), the demand is strong. Also in commercial vehicles such as microbuses, there is an increasing demand for differentiation through 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 have applied an original seal or an emblem or the like to the top coat of an automobile body, or partially painted or painted a pattern. The weather resistance is inferior to the existing top coat, or the step between the seal or emblem and the existing top coat lowers the aesthetics,
Also, depending on the type of pattern, it is necessary to prepare many paint colors, but when there are not many paint colors, the color scheme and design are limited, and originality is limited.

[0005] In order to meet the demands of end-users, it has been difficult to coat an automobile body with a pattern of thousands or tens of thousands of patterns by an automobile manufacturer in terms of productivity.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present inventors
As a result of intensive research, it was possible to efficiently manufacture an automobile body having a pattern that suits the preference of the automobile user, and to obtain an automobile body whose overall coating film having the pattern was a coating film excellent in weather resistance. It was found that the above object can be achieved by setting a pattern on a computer, painting the pattern by an ink jet method using an automatic painting machine operated by computer control, and then applying a clear paint thereon. Reached.

[0007]

That is, the present invention provides:
A method for manufacturing an automobile body in which a pattern coating film is formed on an automobile body in which an undercoating film and an intermediate coating film are sequentially formed on a substrate, wherein (1) a shape of a pattern to be painted on a computer in advance. And setting a paint color, (2)
At least for the three primary colors of red, blue and yellow , respectively
A nozzle with a dedicated nozzle diameter in the range of 0.2 to 0.5 mm
An extremely small two-fluid nozzle with a mechanism to suppress play diffusion
Forming a coating film of a predetermined pattern set by a computer on the intermediate coating film by spray coating with an automatic coating machine having an air spray type coating head provided and operated by computer control; and (3) The present invention provides a method of manufacturing an automobile body having a patterned coating film, which comprises a step of applying a clear paint on the patterned coating film.

[0008] The present invention also provides: The painting head is red,
Item 1. The coating head described above, which is provided with a dedicated nozzle for each of three basic primary color paints of blue and yellow, and a dedicated nozzle for at least one type of paint selected from a black primary color paint, a white primary color paint, and a paint containing a bright pigment. It is intended to provide the described production method.

[0009] The present invention also provides: 3. The method according to item 1 or 2, wherein the substrate is a metal substrate or a chemical conversion-treated metal substrate, and the undercoat film is an electrodeposition film.

[0010] Further, the present invention provides: 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 To provide.

The present invention also relates to 5. Item 5. The method according to any one of Items 1 to 4, wherein the intermediate coating film is a two-layer coating film formed from two types of paints.

Further, the present invention provides a method for manufacturing a semiconductor device comprising: Item 6. The method according to any one of Items 1 to 5, wherein the clear paint is a thermosetting acrylic resin clear paint.

[0013] The present invention also provides a method of the present invention. The above-mentioned items 1 to 6, wherein the paint for forming the pattern coating film to be applied by the automatic coating machine is a thermosetting paint, and after applying the clear coating material, the pattern coating film and the clear coating film are simultaneously baked. The present invention provides a production method according to any one of the above.

Further, the present invention relates to 8. Item 8 provides the production method according to any one of Items 1 to 7, wherein the clear paint contains an ultraviolet absorber.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a patterned coating is formed on an automobile body in which an undercoat and an intermediate coating are sequentially formed on a substrate. Substrates used can be used without limitation as long as they can be used for automobile bodies,
For example, steel plate, aluminum plate, galvanized steel plate, iron
Metal substrates such as zinc alloy-plated steel sheets, and chemical conversion metal substrates obtained by subjecting these metal substrates to a chemical conversion treatment such as chromate treatment, zinc phosphate treatment, and iron phosphate treatment, and plastics substrates such as FRP. be able to.

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

In order to form an electrodeposition coating film, the substrate may be immersed in an electrodeposition bath by a known method and subjected to electrodeposition coating. As the electrodeposition bath, any of known anion-type electrodeposition baths and cation-type electrodeposition baths 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.
Species or two or more species can be mentioned. As the anion electrodeposition bath, the base resin component has an acid group such as a carboxyl group, and as the cation electrodeposition bath, the base resin component has an amino group; an onium base such as an ammonium group, a sulfonium group, or a phosphonium group; And these groups can be neutralized and ionized to make aqueous.

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

When the undercoat is formed by spray coating when the substrate is a metal substrate or a chemical conversion-treated metal substrate, usually, an undercoat paint with an emphasis on anticorrosion properties, such as incorporating a rust preventive pigment. Is painted. As the resin, epoxy resin, polyester resin, alkyd resin, vinyl resin,
Acrylic resin or the like is used.

When the substrate is a plastic substrate,
Generally, plastics are inferior in adhesion of a coating film. Therefore, as an undercoating paint, a coating material which can improve the adhesion of an intermediate coating film by being applied to the surface of the plastics is used. Examples of the resin for the undercoat paint include chlorinated polyolefins such as chlorinated polypropylene, polybutadiene, modified polybutadiene containing an epoxy group, modified polybutadiene containing a carboxyl group, polyurethane resin, and acrylic resin.

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

After the undercoat coating, if necessary, wash with water,
Then, after air drying or curing by baking or the like, an intermediate coating is applied. The intermediate coating may be in any form of a water-based coating, an organic solvent-based coating, or a powder coating. As the resin, an alkyd resin, a polyester resin, an acrylic resin, a polyurethane resin, a vinyl resin may be used. Various resin-based paints, such as paints, can be used. Among them, alkyd resin systems are generally used.

A pigment is blended with the intermediate coating for the purpose of concealing the substrate. 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 suitably 5 or more, preferably 6 or more.

The curing of the intermediate coating composition can be usually carried out by baking. When the intermediate coating is applied in an uncured state, the electrodeposition coating is cured at the same time as the intermediate coating 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 different functions can be shared between the layers. For example, the first layer has a high pigment concentration to share the concealing property, and the second layer has a low pigment. Those with emphasis on aesthetics as the concentration,
Further, there can be cited one in which the first layer has a chipping resistance function and the second layer imparts coating film hardness, durability and the like.

In the method of the present invention, a coating having a predetermined pattern set in a computer is applied to a vehicle body having the electrodeposition coating and the intermediate coating formed thereon in order by red, blue, and blue.
Spray painting is performed by an automatic painting machine that has a painting head equipped with dedicated nozzles for each of the three small primary colors for the three primary colors of yellow and that is operated by computer control. Hereinafter, the coating method using an automatic coating machine with a coating head equipped with a special nozzle with a small diameter is referred to as the “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, a pattern selected from the shapes and paint colors registered in the computer is selected as desired by the user. Alternatively, the pattern may be set by causing a computer to read the pattern created by the user.

In the method of the present invention, the basic primary colors are
At least one selected from paints of primary colors or mixed colors other than the above-mentioned basic primary colors such as black primary color and white primary color, and paints containing glittering pigments, if necessary, including three basic primary color paints of red, blue and yellow. A desired color is obtained by successively applying the desired paint by an ink-jet method in accordance with an instruction from a computer, as required, and applying the paint in a desired shape to form a patterned coating film.

The three basic primary colors are pure red, pure blue, and pure yellow, so that as many paints as possible can be produced, which is ideal. Since there is no color paint, a paint in which pigments of colors close to these colors are dispersed is appropriately selected and used as the three basic primary colors.

Red pigments for red paints, which are basic primary colors, include lake red 4R, carmine FB, dinitroaniline orange, pyrazolone orange, pyrazolone red, perinone orange, permanent red 2B, lake red R, bon maroon light, and bordeaux. 10B, Bon Maroon Medium, Thioindigo Bordeaux, Bon Maroon L, Perylene Vermilion, Perylene Scarlet, Perylene Maroon, Benzimidazolone Orange,
Examples thereof include chromium vermilion / molybdenum red, red iron oxide, toluidine red, and γ-type quinacridone red.

Blue pigments for blue paints, which are basic primary colors, include cyanine blue pigment blue 15 and 15:
1, 15: 2, 15: 3, 15: 4, metal-free cyanine blue, induslen blue, navy blue, ultramarine blue, cobalt blue and the like.

The yellow pigments for the yellow paint, which are the basic primary colors, include Shimura Yellow 3056, Fast Yellow G,
Monoazo pigments such as Fast Yellow 10G, Shimura Yellow 4119, Permanent Yellow FGL, and Benzimidazolone; Disazo Pigments such as Disazo Yellow AAMX, Disazo Yellow AAOT, Disazo Yellow AOAA, Disazo Yellow AAA, Permanent Yellow HR, and Lionol Yellow FFR; Condensed azo pigments such as phthalo yellow 3G, chromophthal yellow 6G, and chromophthal yellow GR; Irgazin yellow 3RLTN, Irgazin yellow 2RLT, Irgazin yellow 2GLT, Fastgen super yellow G
Isoindolinone pigments such as ROH, Fastogen Super Yellow GRO, Sandrin Yellow 6GL, etc .; Slenic 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, graphite, yellow iron oxide, titanium yellow and the like.

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

As the glitter pigment of the paint containing the glitter pigment used as needed, aluminum powder, bronze powder, copper powder, stainless steel powder, nickel powder, mica titanium foil, mica iron oxide foil and the like are used. be able to.

In the present invention, the coating head of the automatic coating machine by the ink jet system has nozzles for each of the three primary primary colors of red, blue and yellow. Alternatively, when a mixed color is used, a nozzle for these paints is further provided. Although a considerable range of paint colors can be obtained with the three basic colors, when the paint color of the intermediate coating film surface is light or white, it is usually used for black paint in addition to the above three basic colors. It is preferable to provide a nozzle for white paint when the coating color on the surface of the intermediate coating film is dark or when the pattern coating film is light or white.
Further, by providing a nozzle for a paint containing a brilliant pigment, the width of design can be greatly expanded. In addition, there is a case where the range of paint colors can be expanded by using a dedicated nozzle for paint of a primary color or a mixed color other than the basic primary colors in combination.

The coating head provided with these dedicated nozzles discharges paint from the dedicated nozzles in conjunction with an automatic coating machine that moves in a three-dimensional space that is a short distance from the three-dimensional object according to the position data. Then, a patterned coating film can be formed by appropriately applying a coating material as needed. The coating time for forming a pattern by the ink jet method differs depending on the type and the coating area of the pattern coating film, 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 types 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 according to 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 each case, the paint is discharged only to a necessary portion by an on-demand type spray ON / OFF (on / off) mechanism. The diameter of the small-diameter nozzle in the ink jet system 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 an extremely small two-fluid nozzle.

The resin of the three basic primary colors, the paint containing the brilliant pigment, and the paints of the primary colors other than the above-mentioned basic colors or mixed colors is not particularly limited, and various resin types such as acrylic resin type, alkyd resin type and polyester resin type are available. The coating material may be a thermosetting, lacquer-curable or oxidative-curing coating. In the three basic colors, the pigment content is generally high because of the necessity of concealment in a thin film. Usually, the pigment content is 30 to 150 parts by weight, preferably 50 to 1 part by weight, 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 a pattern having a specific shape, a multicolored pattern, a coating film having a two-tone finish or a full-color finish with a single color is 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 onto the object from a short distance. , It is possible to greatly reduce the running cost. However, since the number of times of application varies depending on the desired color, the film thickness in a small area tends to be different, and since the flight distance of the paint particles is short, the viscosity of the applied paint does not increase and it becomes easy to sag. There's a problem.

Therefore, the pattern coating is usually 1 to 10 μm.
m, and it is necessary to contain a large amount of pigment in order to conceal with a thin film. Therefore, the glossiness is reduced and the appearance of the coated surface is deteriorated, and the weather resistance and chemical resistance are reduced. Therefore, in the method of the present invention, these problems are solved by applying a clear paint on the patterned coating film.

As the clear paint, any clear paint having good weather resistance can be used without limitation, such as an organic solvent-based paint, an aqueous paint, and a 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 paint, those used as top clear paints for automobiles are suitably used, and among them, an acrylic resin-based thermosetting clear paint is suitable.

The clear paint may be applied after the pattern paint is cured. However, when the clear paint is of a thermosetting type, the pattern paint is air-dried and uncured. It is preferable to apply a clear paint and then heat it to simultaneously bake the pattern coating and the clear coating from the viewpoints of interlayer adhesion between the pattern coating and the clear coating, reduction in the amount of heating energy, and the like. In addition, the clear paint may contain an ultraviolet absorber for improving weather resistance. The clear paint may be applied only on a portion having a pattern, but it is preferable to apply the clear paint on the entire surface of the intermediate coat.

[0045]

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

Example 1 A cationic electrodeposition coating material “ELECRON GT-10” (manufactured by Kansai Paint Co., Ltd.) is electrodeposited on a car body made of a cold-rolled steel sheet having a thickness of 0.5 mm and baked to a thickness of about 0.5 mm. An electrodeposition coating film of 22 μm was formed. A polyester / melamine resin intermediate coating "ES Primer TP-37 White" (manufactured by Kansai Paint Co., Ltd.) is applied as an intermediate coating on the electrodeposited coating film by electrostatic spraying and baked to form a middle coating having a thickness of about 30 [mu] m. A film was formed. The L ^* value of the surface coating color of the intermediate coating film was about 8.

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

Among the four primary colors, the pigment type in the red primary color is γ-quinacridone red, and the P / B ratio [weight ratio of the amount of the 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 in the yellow primary color is Irgazine 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 a water-based thermosetting acrylic resin-based clear coating material was used instead of Magiclon Clear as a clear coating material. Asuka Bake Kuriya "(Kansai Paint Co., Ltd.)
Was carried out in the same manner as in Example 1 except for using, to prepare a coated article. The pigment type in the white primary color is titanium white, and P /
The B ratio is 1.8.

Example 3 In Example 1, an acrylic resin-based primary color, which is only three basic colors of red, blue and yellow, was used as a primary color for forming a pattern coating film 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 Magiclon Clear.

Example 4 In Example 1, an ultraviolet-curable unsaturated polyester resin clear paint "Sonne Topcoat W2000 Clear" (manufactured by Kansai Paint Co., Ltd.) was used instead of Magiclon Clear as the clear paint. A coated article was prepared in the same manner as in Example 1 except that the composition was cured by irradiation with ultraviolet rays instead of baking.

Example 5 In Example 1, an ES primer T was used as an intermediate coating.
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.), electrostatically coated so as to have a dry film thickness of about 8 [mu] m, and baked. Then, as a second layer intermediate coating, Amirac White (manufactured by Kansai Paint Co., Ltd.) , An aminoalkyd resin-based coating) was electrostatically coated so as to have a dry film thickness of about 30 μm and baked to form a two-layer intermediate coating film, thereby producing a coated article.

Example 6 In Example 1, instead of forming a cationic electrodeposition coating film on an automobile body, a conductive primer “SOFLEX 2510C” was applied to an FRP plate (fiber reinforced plastics plate).
D "(manufactured by Kansai Paint Co., Ltd.) and baking to form a conductive primer coating, and only a pattern instead of drawing a specific pattern and characters, and only a head with a dedicated microfluid nozzle as a coating head A coated article was prepared in the same manner as in Example 1 except that the drawing was performed using.

Example 7 In Example 1, a picture and a character were drawn by a coating machine, set, air-dried, then coated with Magiclon clear and baked to simultaneously cure the pattern, the character and the 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 using Magiclon Clear as the clear paint, an ultraviolet absorber 2- was used instead of Magiclon Clear.
A coated article was prepared in the same manner as in Example 1 except that a clear paint containing (2′-hydroxy-5-methylphenyl) benzotriazole in an amount of 1 part by weight based on 100 parts by weight of the resin solid content was used. did.

Embodiment 9 In Embodiment 1, specific pictures and characters set in a computer in advance have the same shape but have a partially metallic feeling. The paints used for painting are five kinds of paints of the four primary colors and the paint containing the brilliant pigment, and either a paint head having a dedicated single-hole nozzle or a paint head having a dedicated micro two-fluid nozzle. A coated article was prepared in the same manner as in Example 1, except that the head was a head having five dedicated nozzles. The bright pigment-containing paint,
"Alpaste 1100NA" (aluminum powder paste manufactured by Toyo Aluminum Co., Ltd.) in an acrylic resin liquid has a P / B ratio [the ratio of the amount (parts by weight) to the resin solid content (parts by weight)] of 0.4. The organic solvent type bright pigment-containing paint dispersed as described above.

Comparative Example 1 A coated article was prepared in the same manner as in Example 1 except that a specific pattern and characters were painted and baked, and then no clear paint was applied.

With respect to the coated articles obtained in Examples 1 to 9 and Comparative Example 1, tests for finished appearance and weather resistance were conducted. The test results are shown in Table 1 below.

Test Method Finish 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 ：: Slightly poor ×: Poor Weather resistance: Accelerated backlash test using the accelerated weather resistance tester manufactured by Q Panel Co., Ltd. Was done. The test conditions were (ultraviolet irradiation 16 hours /
A test was performed for 3000 hours (125 cycles) with one cycle consisting of 24 hours of 60 ° C., water condensation 8 hours / 50 ° C.), and the discoloration degree and gloss change of the coated surface were visually evaluated according to the following criteria.

Discoloration degree A: Almost no discoloration is observed. A: Slight discoloration is observed but there is no practical problem. Δ: Remarkable discoloration is observed. X: Remarkable discoloration is observed. Gloss change A: Almost Maintains the same gloss as in the initial stage. ○: Slight decrease in gloss is observed but within a range where there is no practical problem. ：: Significant decrease in gloss is observed. X: Significant decrease in gloss is observed.

[0062]

[Table 1]

In Examples 1 to 9, there was a slight difference in the finished appearance between the combination of the patterned coating film and the different types of clear paint, but the finished appearance was excellent. Example 8 using a clear paint containing an ultraviolet absorber was the most excellent in terms of discoloration due to blackout. Comparative Example 1 in which the clear paint was not applied was inferior in the finished appearance (particularly gloss) and the 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, the piping equipment for supplying the paint can be made only with standard colors, so that the equipment cost and the maintenance cost are greatly reduced. Furthermore, by reducing the number of paint colors to be prepared, the process management and the paint management are simplified, and the labor cost required for the process management is greatly reduced. In addition, since the top coat enamel coating process, which had to use an air spray coating machine with a low coating efficiency to impart design properties, has been omitted, the running cost of supply and exhaust equipment and wastewater treatment in the coating line is also reduced. Can be drastically reduced.

Further, if a coating facility for forming a pattern coating film is provided at the dealer side so that the dealer can form the pattern coating film, it is easy to respond to the demands of the end user in detail, and the originality according to the taste of the user can be achieved. An automobile body having a patterned coating film having a certain pattern can be easily produced.

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

As described above, according to the present invention, it is possible to save labor on a painting line of an automobile maker, to cope with various painting appearance requirements of an end user of an automobile, and to achieve high painting efficiency in pattern painting. It is possible to realize an automobile body manufacturing method that is friendly to the global environment.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI B05D 7/24 302 B05D 7/24 302P 303 303A (56) References JP-A-3-89963 (JP, A) JP-A-63 JP-A-1224052 (JP, A) JP-A-3-106647 (JP, A) JP-A-63-116785 (JP, A) JP-A-3-178374 (JP, A) JP-A-4-235765 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B05D 1/00-7/26

Claims (8)

(57) [Claims] The present invention relates to a method for manufacturing an automobile body in which a base coat and an intermediate coat are sequentially formed on a base material to form a patterned coating on the automobile body. (2) for at least three basic primary color paints of red, blue, and yellow
The dedicated nozzle diameter ranges from 0.2 to 0.5 mm
Two fluids with a mechanism to suppress spray diffusion
A step of forming a coating having a predetermined pattern set on a computer by spray coating on the intermediate coating by an automatic coating machine having an air spray type coating head equipped with a nozzle and operating under computer control; and (3) A method of manufacturing an automobile body having a patterned coating film, comprising a step of applying a clear paint on the patterned coating film. 2. The coating head is a nozzle dedicated to each of three basic primary colors of red, blue and yellow, and a dedicated nozzle selected from at least one type of paint selected from black primary color paint, white primary color paint, and paint containing a bright pigment. 2. The method according to claim 1, wherein the coating head includes a nozzle. 3. The method according to claim 1, wherein the substrate is a metal substrate or a chemical conversion-treated metal substrate, and the undercoat film is an electrodeposition film. 4. The coating color of the surface of the intermediate coating film is L ^* a ^* b ^*
The method according to any one of claims 1 to 3, wherein an L ^* value in a color system is 5 or more. 5. The intermediate coating film according to claim 1, wherein the intermediate coating film is a two-layer coating film formed from two kinds of coating materials.
The production method according to any one of the above. 6. The production method according to claim 1, wherein the clear paint is a thermosetting acrylic resin clear paint. 7. A paint for forming a pattern coating to be applied by an automatic coating machine is a thermosetting paint, and after applying a clear coating, the pattern coating and the clear coating are simultaneously baked. The manufacturing method according to claim 1. 8. The production method according to claim 1, wherein the clear paint contains an ultraviolet absorber.