JP2003118651A - Manufacturing method of automobile body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce VOC in an assembly line of an automobile body in regard to a manufacturing method of the automobile body manufacturing the automobile body by cutting and/or molding plastic into parts of the automobile body and assembling them in the assembly line of the automobile body. SOLUTION: The manufacturing method of the automobile body is characterize in that the automobile body is assembled by using covered automobile parts E comprised by cutting and/or molding the plastic A to form the automobile body parts B, and adhering colored plastic film C and clear plastic film D on at least outer surfaces of the parts B.

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 by molding and / or cutting plastic into an automobile body part in an automobile body assembly line, and assembling the same to form an automobile body, and more particularly to an automobile body. Its main purpose is to reduce VOCs in the assembly line of vehicle bodies.

[0002]

2. Description of the Related Art In a car body such as a passenger car or a light car, a portion mainly composed of a metal sheet metal to which no accessories such as an engine and a suspension are mounted is called a shell body. This shell body
Is usually a main body consisting of an underbody, side members, roof, cowl, upper back, lower back, etc., and a hood, front balance, front fender, cowl louver, door, luggage (back). Door), bumper, spoiler, garnish, side protector, tire house and other outer lids.

Conventionally, in order to form these main body and outer lid, a bare unpainted metal plate is cut and molded to fit the size and shape of each component, and these are assembled to form a shell body. Then, this is immersed in a cationic electrodeposition coating solution bath, and the front surface, back surface, end face portion, etc. of the metal plate are electrodeposited to form an undercoat coating film. An intermediate coating material, a top coating material, and the like are applied to the surfaces located outside these.

However, recently, the reduction of the amount of VOC (volatile organic compound) used in the assembly and production line of automobile bodies has led to the reduction of the process and energy consumption in the coating line.
It is strongly desired to reduce CO2. Moreover, further improvement in chipping resistance, corrosion resistance, designability, and finished appearance of the comprehensive coating film is required.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above-mentioned problems in the assembly and production line of automobile bodies. As a result, this time, without using a metal sheet metal, a plastic material is used, and these are cut and / or molded to form an automobile body part, and a colored plastic film and a clear plastic film are formed on at least the outer surface of this part. By assembling an automobile body using coated automobile parts made by attaching
The inventors have found that the above problems can be solved all at once, and have completed the present invention.

That is, according to the present invention, the automobile body part (B) is obtained by cutting and / or molding the plastic (A).
And a colored automobile plastics film (C) and a clear plastics film (D) are attached to at least the outer surface of the component (B) to assemble an automobile body. A method for manufacturing an automobile body (hereinafter, referred to as "this method") is provided.

Further, the present invention is an automobile body part (B).
There is provided a method for manufacturing an automobile body, which comprises prepainting an intermediate coating material (F) on at least the outer surface of the above prior to applying the colored plastic film (D).

Furthermore, the present invention is an automobile body part (B).
A colored plastic film (C) and a clear plastic film (D) are adhered to at least the outer surface thereof, and the solid plastic content at the time of coating is 80% by weight or more on the clear plastic film (D) surface of the outer surface. Provided is a method for manufacturing an automobile body, which comprises using a coated automobile part (E) obtained by coating a solid content paint (G). Furthermore, the present invention has a solid content of 80 at the time of coating instead of sticking the clear plastic film (D).
Provided is a method for manufacturing an automobile body, which comprises assembling an automobile body using a coated automobile part (E) obtained by coating a high solid content paint (G) in an amount of at least wt%.

The present invention will be described in detail below.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present method is mainly applicable to passenger cars and light vehicles, but can be similarly applied to the manufacture of automobile bodies such as trucks, buses and auto-byes.

In the present invention, the main part of the vehicle body such as a passenger car or a light vehicle which is not equipped with accessories such as an engine and suspension is called a shell body, and this shell body is usually an underbody, Main body consisting of side members, roof, cowl, upper back, lower back, etc., hood, front balance, front fender, cowl louver, door, luggage (back door), bumper, spoiler, A garnish, a side protector, an outer lid such as a tire house, and at least a part of these shell bodies, preferably most or all of them, are made of plastic (A) instead of the conventional metal. The present invention relates to a method for manufacturing an automobile body.

The plastic (A) can be applied without any particular limitation as long as it is a material having a physical strength equal to or higher than that of a conventional metal plate for automobile bodies. Specific examples are listed below.

Polyethylene, polypropylene, polyvinyl chloride, polystyrene, ABS resin (terpolymer of acrylonitrile, butadiene and styrene), AS resin (copolymer of acrylonitrile and styrene), methacrylic resin, polyvinyl alcohol, Polyvinylidene chloride, polyethylene terephthalate (PET), polyamide resin (PA), nylon, polyacetal (POM,
Polyoxymethylene), polycarbonate (PC), modified polyphenylene ether (PPE), polybutylene terephthalate (PBT), glass fiber reinforced polyethylene terephthalate (GFRPET), ultra high molecular weight polyethylene (UHPE), polysulfone (PSF), polyether sulfone (PES), polyphenylene sulfide (PPS), polyarylate (PAR, U-polymer), polyamideimide (PAI), polyetherimide (PEI), polyetheretherketone (PEE)
K), polyimide (PI), polytetrafluoroethylene (PTFE), polyamino bismaleimide (PAB)
M), polybisamide triazole (BT resin), polyurethane, silocone resin and the like. Blends (alloys) of polypropylene and ethylene / propylene / butadiene copolymer, copolymers (ASA) of acrylonitrile / styrene / acrylic acid ester, polymethylmethacrylate and the like are also applicable. These plastics may be mixed with a solid color pigment, a metallic pigment, a light interference pigment, or the like to be colored in a solid color tone, a metallic tone, or a light interference tone. Further, it may be reinforced with an extender pigment, glass fiber or the like.

These plastics (A) themselves are granular,
It may be in the form of a lump or a sheet. Granular or lumpy plastic (A) can be produced by known methods such as extrusion molding and injection molding, for example, hood, front balance, front fender, cowl louver, door, luggage (back door), bumper. , A spoiler, a garnish, a side protector, a tire house, etc. can be molded into an automobile part (B). Further, the sheet-shaped plastic (A) preferably has a thickness of about 0.5 to 20 mm, and is cut and molded into a desired shape, and if necessary, these are joined together to form an automobile part (B). ) Is formed.

The surface of the plastic (A) may be subjected to treatments such as corona discharge treatment, plasma treatment and flame treatment.

In this method, the plastic (A) is cut and / or molded, and further joined as necessary to form an automobile body part (B).

Here, the "automobile body" is a portion mainly composed of sheet metal, that is, a shell body, on which no accessories such as an engine and suspension are mounted. The shell body is usually a main body consisting of an underbody, side members, roof, cowl, upper back, lower back, etc., and a hood, front balance, front fender, cowl louver, door, luggage. (Back door), bumper, spoiler, garnish, side protector, outer cover such as tire house.

The underbody refers to a floor such as a passenger compartment (cabin) and a luggage compartment, and is a general term for a front underbody, a front floor, a rear floor and the like. The side member is coupled with a front body, a roof panel, an underbody, etc. to form a side surface of the passenger compartment, and prevents the vehicle from being bent or twisted. The cowl is a panel that connects the right and left pillars. The upper back is a panel that connects the left and right quarter panels (rear fenders) at the rear of the vehicle body to form the outer surface of the vehicle body. The automobile body parts (B) are the above-mentioned parts forming the main body and the outer lid or the unit parts forming the parts.

In the present method, applying the intermediate coating material (F) to the surface of the automobile body part (B) thus prepared, which is located outside, can improve the smoothness of the overall coating. Since it is more preferable, it is not an essential requirement. As the intermediate coating composition (F), known ones can be applied, but among these, it is preferable to use an aqueous intermediate coating composition, a powder intermediate coating composition, etc. from the viewpoints of low VOC, resource saving, pollution prevention and the like.

The water-based intermediate coating composition comprises, as a main component, one or more base resins selected from polyester resins, acrylic resins, urethane resins and the like and a crosslinking agent selected from melamine resins, blocked polyisocyanate resins and the like. A thermosetting coating material can be preferably used. As the powder intermediate coating material, a thermosetting coating material containing a polyester resin or acrylic resin having a glycidyl group and a carboxyl group-containing compound is suitable. A color pigment, an extender pigment, etc. can be appropriately contained in the intermediate coating material.

The intermediate coating material (F) is preferably applied to the surface located outside the automobile body part (B), but may be applied to the inner surface side. The coating can be performed by air spray, airless spray, electrostatic coating, etc., and the film thickness is 5 to 200 μm based on the cured coating film.
The range of 15 to 150 μm is particularly suitable, and the coating film can be cured by heating at 100 to 200 ° C. for about 10 to 40 minutes.

According to this method, an automobile body part (B) is coated with an intermediate coating (F) on the outer surface, if necessary, and then
A colored plastic film (C) corresponding to the top coating film is attached to the surface located on the outer surface.

Examples of the material of the colored plastic film (C) include polyolefin resins such as polyethylene and polypropylene, and polyethylene terephthalate (P).
ET) and other polyester resins, polycarbonate resins, polyvinylidene fluoride resins and other fluorine-containing resins,
Thermoplastic resins such as polyvinyl acetate resin, nylon, polyamide resin, polystyrene resin, acrylic resin, polyurethane resin, polyether resin and cellulose acetate can be used.

The plastic film (C) can be prepared by molding these materials into a film by, for example, extrusion molding, injection molding, calendar molding, compression molding or the like, and the thickness thereof is Usually 1 to 1
The range of 00 μm, especially 5 to 50 μm is suitable, and this product is subjected to a treatment such as corona discharge treatment, plasma treatment, flame treatment or the like before or after being attached to the automobile body part (B). It is possible to keep it. The colored plastic film (C) is colored in a solid color tone, a metallic tone, or an optical interference tone with one or more kinds of coloring pigments selected from a solid color pigment, a metallic pigment, and an optical interference pigment.

Alternatively, it is preferable that the colored plastic film (C) is preliminarily provided with a pattern, and the colored plastic film (C) is used to adhere to the automobile body part (B). The pattern is not limited as long as it imparts designability, aesthetics, uniqueness, distinctiveness, etc. to the outer portion of the automobile body. Marks, symbols, illustrations, pictures, designs, and combinations of these are examples. These may be any one of a single color, a mixed color, a composite color, a gradation, and a shade. These patterns can be formed on the front surface and / or the back surface of the plastic film (C).

The pattern can be applied to the plastic film (C) by printing with a printing ink or by applying a coloring paint. Known printing inks and paints can be used. These are generally colorants (pigments, dyes), resins (or oils and fats) and solvents, and if necessary, plasticizers, additives (waxes, dryers, dispersants, wetting agents, emulsifiers, antiskinning agents, stabilizers, stabilizers, etc. Agent) and so on. As a colorant,
For example, inorganic pigments such as titanium oxide, carbon black, aluminum powder and bronze powder; disazo yellow,
Organic pigments such as brilliant amine, lake red, phthalocyanine blue and methyl violet lake;
Fluorescent pigment; Eosin, Victoria Bull-, Nigrosine,
Examples include dyes such as Disperse Red (acid dyes, basic dyes, oil-soluble dyes, disperse dyes). As the resin, for example, rosin-modified phenol resin, urea resin,
Melamine resin, ketone resin, vinyl chloride resin, butyral resin, styrene / maleic acid resin, chlorinated polypropylene, acrylic resin, coumarone / indene resin, petroleum resin, polyester resin, alkyd resin, polyamide resin, epoxy resin, polyurene Resin, nitrocellulose
, Ethyl cellulose, hydroxyethyl cellulose,
Examples include rubber-based resins. As the solvent, an organic solvent or water can be used.

These printing inks and paints include evaporation drying type, reaction curing type, oxidation polymerization type, thermosetting type, one-component curing type, multi-component curing type, ultraviolet curing type, solid color coating film forming type, Those selected from metallic coating film forming type, light interference coating film forming type, colored opaque coating film forming type, colored transparent coating film forming type and the like are suitable.

Printing of the printing ink on the plastic film (C) can be carried out by a known method. As a plate for printing, relief printing, lithographic printing, intaglio printing, stencil printing, etc. can be used, and printing methods include lithographic printing, letterpress printing, intaglio printing, screen printing, flexographic printing, gravure printing, offset printing, electrophotography, Thermal transfer method, inkjet method, magnetography, electronic printer, direct printing,
There are dilitho, dips, Delphi, double-sided printing, etc. Furthermore, it is also possible to print a pattern having a three-dimensional effect and a high-grade feeling by halftone printing, photographic printing, multiplex printing, or the like. Further, the method of applying a paint to the plastic film (C) to form a pattern includes, for example, brush painting, spray painting, airless painting, in addition to the above printing method.
It can also be done by electrostatic coating.

Printing and coating on the plastic film (C) can be performed on the front surface and / or the back surface of the film. In a system in which the back surface (metal plate side) is printed or painted, since the pattern is seen through the plastic film (C), it is preferable to use a colorless transparent or colored transparent plastic film (C).

The sticking of the plastic film (C) to the car body part (B) can be carried out by a method known per se, for example, while pressing the plastic film onto the car part with a pressure roll. It can be carried out. In this step, the automobile body part (B) and / or the plastic film (C) is heated to 50 ° C. or higher, preferably 80 ° C.
It is preferable to heat to ~ 200 ° C. The sticking of the plastic film (C) is performed at least on the outer surface of the automobile body component (B), but it is also possible to coat both surfaces of the automobile component with the plastic film (C).

In order to improve the adhesiveness between the automobile body part (B) and the plastic film (C), it is preferable to apply an adhesive agent to a predetermined portion of the surface of both or both of them. Examples of such an adhesive include bisphenol type epoxy resin, resole type epoxy resin, acrylic resin, aminoplast resin, polyester resin,
1 selected from urethane resin, polysiloxane resin, etc.
Alternatively, a thermosetting or thermoplastic adhesive containing two or more resins may be used. Furthermore, 2,4,6-trimercapto-S-triazine, 2-dibutylamino-4,6-
Dimemercapto-S-triazine, 2,4,6-Trimercapto-S-triazine-monosodium salt, 2,
Triazinethiol-based compounds such as 4,6-trimercapto-S-triazine-trisodium salt can also be used as an adhesive.

It is also possible to further adhere a colorless transparent or colored transparent clear plastic film (D) to the surface of the plastic film (C) adhered to the automobile body part (B). As a result, the finished appearance can be further improved.

The plastic film (D) includes, for example, a polyolefin resin such as polyethylene or polypropylene, a polyester resin such as polyethylene terephthalate (PET), a fluorine resin such as a polycarbonate resin or a polyvinylidene fluoride resin. Resins, polyvinyl acetal resins, nylons, polyamide resins, polystyrene resins, acrylic resins, polyurethane resins, polyether resins, cellulose acetate, etc., which have excellent weather resistance and other thermoplastic resins, should be mentioned. You can

The plastic film (D) can be prepared by molding these materials into a film by extrusion molding, injection molding, calendar molding, compression molding or the like, and the thickness thereof is usually 1 to 200 μm,
Particularly, the range of 20 to 100 μm is suitable. The surface of the plastic film (D) may be subjected to a treatment such as corona discharge treatment, plasma treatment, or flame treatment before or after being attached to the surface of the plastic film (D). The plastic film (D) may be colored in a solid color tone, a metallic tone, or a light interference tone to the extent that the transparency is not lost.

The plastic film (D) can be adhered to the surface of the plastic film (C) adhered to the automobile body part (B) by a method known per se, for example, a pressure roll. Then, it can be performed while the plastic film (E) is pressure-bonded to the surface of the plastic film (D). In this step, the plastic film (C) and / or the plastic film (D) is mixed with 50
It is preferable to heat at a temperature of not less than 0 ° C, preferably 80 to 200 ° C. The sticking of the plastic film (D) is performed at least on a portion located outside the outer plate portion of the vehicle body, but it is also possible to coat both surfaces of the automobile body part (B) with the plastic film (D). .

In order to improve the adhesiveness between the plastic film (C) and the plastic film (D), it is preferable to apply the above-mentioned adhesive agent to one or both predetermined portions of both films in advance.

The plastic film (C) and the plastic film (D) are adhered to each other in advance so that the plastic film (D) is on the outside, and the plastic film (D) is placed on the outer side portion or the back side portion of the automobile body part (B). It is also possible to attach it.

Using a coated automobile part (E) obtained by adhering a plastic film (C) and a plastic film (D) to at least the outer surface of an automobile body part (B), and assembling these parts into an automobile body. The method is achieved by

Using the coated automobile part (E), an underbody, side member, roof, cowl, upper back,
Main body consisting of lower back, etc., as well as outer covers such as hood, front balance, front fender, cowl louver, door, luggage (back door), bumper, spoiler, garnish, side protector, tire house. To manufacture. Where underbody
Indicates a floor such as a passenger compartment (cabin) and a luggage compartment, and is a general term for a front underbody, a front floor, a rear floor, and the like. The side member is coupled with a front body, a roof panel, an underbody, etc. to form a side surface of the passenger compartment, and prevents the vehicle from being bent or twisted. The cowl is a panel that connects the right and left pillars.
The upper back is a panel that connects the left and right quarter panels (rear fenders) at the rear of the vehicle body to form the outer surface of the vehicle body.

Specifically, the plastic (A) is cut into a desired shape and size, molded by a press machine or the like, and if necessary, they are joined by an adhesive, welding, bolting or the like. For automobile body parts (B)
A coated automobile part (E) is prepared by applying an intermediate coating composition (F) mainly to the outer part as necessary and then attaching a colored plastic film (C) and a plastic film (D) to at least the outer part. Underboard,
A main body is manufactured by forming and joining each member such as a side member, a roof, a cowl, an upper back, and a lower back. Cutting, molding, joining and the like can be performed by known methods. At least the outside of the main body molded in this way is covered with plastic films (C) and (D). Similarly, outer coverings such as hoods, front balances, front fenders, cowl louvers, doors, luggage, bumpers, spoilers, garnishes, side protectors, and tire houses are also manufactured using coated automobile parts (E). can do. These cutting, molding, joining and the like can be performed by methods known per se.

By forming a shell body (automobile body) composed of a main body and an outer lid using the coated automobile part (E), the automobile body intended by the present invention is formed.

In this method, the plastic film (D) of the coated automobile part (E) obtained by sticking the colored plastic film (C) and the plastic film (D).
The finished appearance (smoothness, sharpness, gloss, etc.) can be further improved by applying a high solid content type top coating material (G) to the surface of the.

The high solids type top coating composition (G) has a solids content of 80% by weight or more, particularly 85 to 98, when coated.
It is a liquid coating material of weight%, and specifically, the coating materials exemplified below can be preferably used.

(G-1): (a) Weight average molecular weight is 10
00 or less, a hydroxyl group-containing compound having a hydroxyl value of 200 to 800 and (b) a polyisocyanate compound, and the ratio of both components is 0.5 / 1 in terms of NCO / OH molar ratio.
It is a high solids coating composition of ˜2.0 / 1, which has a low coating viscosity and a finished appearance, coating film hardness,
It forms a coating film with excellent resistance to acid rain and scratches.

As the component (a), it is preferable to use a ring-opening esterification reaction product of a carboxyl group-containing compound and an epoxy group-containing compound, and the hydroxyl group is a hydroxyl group formed by ring-opening of an epoxy group or other The hydroxyl group introduced by the method may be mentioned. The weight average molecular weight of the component (a) is 1000 or less, particularly 300 to 700, and the hydroxyl value is 20.
0-800, especially 300-600 is preferable and it has 2 or more hydroxyl groups per molecule.

The carboxyl group-containing compound is a compound having one or more carboxyl groups in one molecule, and examples thereof include acetic acid, propionic acid, butyric acid, 2-ethylhexanoic acid, octanoic acid, dodecanoic acid and palmitin. Acid, stearic acid, oleic acid, pivalic acid, versatic acid,
Monocarboxylic acids such as benzoic acid; polycarboxylic acids such as succinic acid, adipic acid, azelaic acid, sebacic acid, dodecanedioic acid, tetrahydrophthalic acid, phthalic acid, butanetricarboxylic acid, butanetetracarboxylic acid, trimellitic anhydride; Examples thereof include oxyacids such as glycolic acid, lactic acid, malic acid, citric acid, tartaric acid, hydroxypivalic acid, dimethylolpropionic acid, dimethylolbutanoic acid, and gluconic acid, and their anhydrides are also applicable. Further, it is possible to use a product obtained by previously reacting these anhydrides with glycols. Specific examples thereof include a reaction product of trimethylolpropane and hexahydrophthalic anhydride, a reaction product of trimethylolpropane and succinic anhydride, and the like. Of these, it is preferable to use a reaction product of an oxyacid or anhydride having both a hydroxyl group and a carboxyl group with an glycol, because a large number of hydroxyl groups can be introduced.

The epoxy group-containing compound is a compound having one or more epoxy groups in one molecule, and the following compounds can be exemplified.

A) Glycidol. 2,3-epoxy-1
-Propanol, obtained by reacting allyl alcohol with benzoic acid or tungstic acid with hydrogen peroxide.

(B) An epoxy group-containing compound obtained by an etherification reaction of a hydroxyl group-containing compound with epihalohydrin. As the hydroxyl group-containing compound, for example, phenol,
Aromatic hydroxyl group-containing compounds such as bisphenol A, bisphenol F, phenol novolac resins, orthocresol novolac resins, and bromides thereof; alicyclic hydroxyl group-containing compounds such as hydrogenated bisphenol A; methanol, ethanol and the like having 1 carbon atom ~ 20 aliphatic monoalcohols; ethylene glycol, propylene glycol, hexanediol, diethylene glycol, neopentyl glycol, glycerin, trimethylolpropane, pentaerythritol, dipentaerythritol, etc. Examples include system polyols. Epichlorohydrin can be preferably used as epihalohydrin. The etherification reaction between the hydroxyl group-containing compound and epihalohydrin can be carried out by a known method. B) As a commercial product corresponding to the component, manufactured by Nagase & Co.,
"Denacor EX-313", "Denacor EX-32
1 "," Denacor EX-421 "," Denacor EX
“-611” (both are trade names).

C) An epoxy group-containing compound obtained by an esterification reaction of a carboxyl group-containing compound and epihalohydrin. As the carboxyl group-containing compound and epihalohydrin, for example, the carboxyl group-containing compound and epihalohydrin exemplified above can be preferably used. The esterification reaction between the carboxyl group-containing compound and epihalohydrin can be performed by a known method. As a commercially available product corresponding to the component (c), "Curdra E1"
0 "(produced by Yuka Shell Epoxy Co., Ltd., trade name)," Glidex N10 "(produced by Exxon Co., trade name)," Araldite PT910 "(produced by Ciba Geigy Co., trade name) and the like.

D) An epoxy group-containing compound obtained by reacting an unsaturated group with a peroxide. Applicable commercial products include "Celoxide 2021" and "Celoxide 3000" (both are trade names) manufactured by Daicel Chemical Industries.

The polyisocyanate compound as the component (b) is a compound having two or more free isocyanate groups (unblocked) in one molecule, and the number average molecular weight is 2
000 or less, particularly preferably in the range of 200 to 1000. For example, aliphatic polyisocyanates such as hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, dimer acid diisocyanate, lysine diisocyanate; hydrogenated xylylene diisocyanate, Alicyclic polyisocyanates such as cyclohexylene diisocyanate, methylenebis (cyclohexyl isocyanate), isophorone diisocyanate; tolylene diisocyanate, phenylene diisocyanate,
Aromatic polyisocyanates such as 4,4'-diphenylmethane diisocyanate, xylylene diisocyanate, tetramethyl xylylene diisocyanate and naphthalene diisocyanate; 2-isocyanatoethyl-2 ，
6-diisocyanatocaproate, 3-isocyanatomethyl-1,6-hexamethylene diisocyanate, 4-
Isocyanatomethyl-1,8-octamethylene diisocyanate (commonly known as triaminononane triisocyanate
Tri) or higher valent organic polyisocyanate compound;
A dimer or trimer of a polyisocyanate compound having two or more isocyanate groups in one molecule thereof; and a polyisocyanate compound having two or more isocyanate groups in one molecule thereof, Examples thereof include prepolymers obtained by reacting a polyhydric alcohol, a low molecular weight polyester resin, water or the like with a urethane under the conditions of excess isocyanate groups. In the component (b), a block polyisocyanate compound in which an isocyanate group is blocked can be used in combination with these unblocked polyisocyanate compounds.

The block polyisocyanate compound is a compound in which the isocyanate group of the polyisocyanate compound is blocked with a blocking agent. As a blocking agent, for example, phenols, oximes, lactams, alcohols
And methylene compounds such as diethyl malonate and the like. The ratio of these block polyisocyanate compounds is preferably 50% by weight or less, particularly preferably 30% by weight or less, based on the total amount of the non-block polyisocyanate compounds.

The above-mentioned ratio of the component (a) and the component (b) is 0.5 / 1 to 0.5 in terms of molar ratio based on NCO / OH.
It is preferably 2.0 / 1, particularly preferably 0.7 / 1 to 1.5 / 1.

The high solid content type top coating composition (G-1) is
It can be prepared by blending the component (a) and the component (b) in the above-mentioned ratio in an organic solvent and uniformly mixing them.

In addition to these components (a) and (b), (G-1) further comprises one or more selected from (c) curing catalyst, (d) rheology control agent and the like. It is also possible to include it.

The component (c) is composed of the above-mentioned components (a) and (b).
It is useful for accelerating the crosslinking reaction of the coating film by the components,
Specifically, tin octylate, dibutyltin di (2-ethylhexanoate), dioctyltin di (2-ethylhexanoate), dioctyltin diacetate, dibutyltin dilaurate, dibutyltin oxide, monobutyltin trioctate, Organotin compounds such as lead 2-ethylhexynoate and zinc octylate may be mentioned. Furthermore, acids such as paratoluenesulfonic acid, dodecylbenzenesulfonic acid, dinonylnaphthalenesulfonic acid, dinonylnaphthalenedisulfonic acid, butylphosphoric acid and octylphosphoric acid, and amine neutralized products of these acids are preferable. (C) The amount of the curing catalyst used can be arbitrarily selected according to the purpose of use,
A total amount of 0.005 to 5 parts by weight, particularly 0.01 to 3 parts by weight, is suitable per 100 parts by weight of the total of the components (a) and (b).

By blending the component (d) (G-
It is possible to add thixotropy to 1), so that when high shear stress is applied during spray coating, the viscosity is sufficiently lowered and spray coating can be easily performed. On the other hand, when a low shear stress is applied after being applied to the surface to be coated, the apparent viscosity can be increased. As a result, it is possible to prevent the occurrence of coating defects such as sagging and cissing when coating on a vertical surface to be coated or when baking onto that portion after coating, and it is possible to form a coating film with a good finished appearance. The effect is obtained. Examples of such rheology control agents include crosslinked polymer fine particles and polyurea compounds.

The component (d) is hardly or completely insoluble in the components (a) and (b) and the organic solvent, and (H)
-1) An internally crosslinked particulate polymer that can be stably dispersed in the polymer.

As a specific example of the component (d), a known intramolecularly crosslinked fine particle polymer obtained by an aqueous emulsion or an aqueous suspension polymerization method or a non-aqueous dispersion polymerization method can be used. Among them, a fine particle polymer having an intramolecular crosslinked structure obtained by an aqueous emulsion or an aqueous suspension polymerization method can be obtained by physical or chemical means such as evaporation or azeotropy of water or precipitation or aggregation of the polymer (particles). , It can be separated in the form of a solid, or when the physical or chemical means is applied, the medium of the target crosslinked polymer particles is directly replaced with water from another resin or an organic solvent. You can also

As the component (d), JP-A-3-66770
Of reactive emulsifiers containing at least two radically polymerizable unsaturated groups in the molecule and other radically polymerizable unsaturated monomers containing an allyl group in the molecule. Crosslinked polymer fine particles obtained by emulsion polymerization in the presence can be preferably used.
In this case, the polymer fine particles are internally crosslinked by the polymerizable monomer having at least two radically polymerizable unsaturated groups in the molecule.

Further, as the component (d), a macromonomer (a) having a molecular chain of poly (12-hydroxystearic acid) and having an average of about 1 or more polymerizable unsaturated double bonds per molecule, , A copolymer of ethylenically unsaturated monomers, having a solubility parameter (SP value) of 7.5 to
9.2 and react with each other in the presence of a mixture with a macromonomer (b) having an average of about 1.0 to about 1.5 polymerizable unsaturated double bonds per molecule. A vinyl-based monomer mixture containing at least 0.5% by weight of at least two vinyl-based monomers each having a complementary functional group that can be bonded together,
Dispersion of fine gel polymer particles obtained by copolymerization and crosslinking reaction in an organic solvent in which the macromonomer (b) and the vinyl monomer are dissolved but the polymer of the vinyl monomer is not substantially dissolved. Can be used. The crosslinked polymer fine particles themselves are known, and are disclosed in Japanese Patent Publication No. 6-70110.
It is disclosed in detail in the publication. Macromonomer (B)
Contains a polymerizable unsaturated group-containing reaction product obtained by adding an epoxy group-containing polymerizable unsaturated unsaturated compound to the terminal carboxyl group of poly (12-hydroxystearic acid), and contains a polymerizable monomer having an epoxy group. Obtained by adding a polymerizable unsaturated carboxylic acid to a pendant epoxy group-containing copolymer obtained by graft copolymerization or block copolymerization with a polymerizable unsaturated monomer mixture
Macromonomers with about 10 polymerizable unsaturated double bonds are preferred. In particular, the macromonomer (a) is a polymerizable unsaturated double compound in one molecule obtained by adding an epoxy group-containing polymerizable unsaturated unsaturated compound to the terminal carboxyl group of poly (12-hydroxystearic acid). Macromonomers with bonds are preferred. Macromonomer (b) has a number average molecular weight of 3,000 to 20,000 and a hydroxyl value of 45 to 1
It is preferably 50. Examples of the combination of complementary functional groups include epoxy group / carboxyl group, alkoxysilyl group / hydroxyl group, epoxy group / phosphoric acid group, isocyanate group / hydroxyl group, and the like.

The component (d) has a high crosslinking density,
Even in an organic solvent having a high polymer-dissolving power such as toluene or ethyl acetate, it is substantially non-swelling and non-fusing, and when added to the composition containing an organic solvent, the viscosity of the composition is It is possible to obtain a solution (dispersion liquid) having a high resin content, that is, a high solid content, with almost no increase. Further, in the present composition containing the crosslinked polymer fine particles, the fine particles and the binder resin together form a cured coating film. The average particle diameter of the crosslinked polymer fine particles is 0.01 to 2 μm.
m, especially within the range of 0.05 to 0.5 is suitable,
When the particle size is within this range, the effect of preventing sagging of the coating film and the finished appearance of the coating film are excellent.

Further, as the component (d), reaction formation of an isocyanurate trimer obtained from a diisocyanate compound having 3 to 20 carbon atoms with an amine compound having one or more primary amino groups. Polyurea compounds in the form of solid particles can also be used (Japanese Patent Publication No. 7-8).
1099 publication). Isocyanurate trimer is 3 to 2
0, preferably 5 to 14, more preferably 8 to 1
It is preferably made from diisocyanates having 2 carbon atoms, particularly preferably hexamethylene diisocyanate. Examples of suitable diisocyanates include methylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, ω, ω ° dipropyl ether diisocyanate, thiodipropyl diisocyanate, cyclohexyl-1,4-diisocyanate, dicyclohexylmethane-4, 4 ° -diisocyanate, 1,5-dimethyl-2,4-bis (isocyanatomethyl) -benzene, 1,5-dimethyl-2,4-bis (ω-isocyanatoethyl) -benzene, 1,3,5-trimethyl Two
4-bis (isocyanatomethyl) benzene, 1,3,5
-Triethyl-2,4-bis (isocyanatomethyl) benzene, Desmodur from Bayer
r) Heterocyclic diisocyanates sold under the trademark TT, dicyclohexyldimethylmethane-4,4'-diisocyanate, 2,4-toluene diisocyanate,
2,6-toluene diisocyanate, diphenylmethane-4,4'-diisocyanate and the like can be mentioned. If desired, heterocyclic trimers of two or three different diisocyanates may be used. It is also possible to use mixtures of the abovementioned heterocyclic triisocyanates.

Second used to make polyurea compounds
Examples of suitable primary amine as a component include benzylamine, ethylamine, n-propylamine, sec-
Propylamine, n-butylamine, sec-butylamine, tert-butylamine, n-pentylamine,
α-methylbutylamine, α-ethylpropylamine,
Examples include β-ethylbutylamine, hexylamine, octylamine, decylamine, stearylamine, cyclohexylamine, aniline and hexamethylenediamine. These primary amines generally contain up to 55 carbon atoms, preferably 1 to 24, more preferably 1 to 12 carbon atoms. Amines with one or more primary amino groups and one or more ether and / or hydroxyl groups can also be used. For example, ethanolamine, 6-aminohexanol, p-methoxybenzylamine, methoxypropylamine, 3,4-
Examples are dimethoxyphenylethylamine, 2,5-dimethoxyaniline, furfurylamine, tetrahydrofurfurylamine, bis (3-aminopropyl) polytetrahydrofuran (having a molecular weight of about 750). Mixtures of the above amines can also be used.

In the reaction of the heterocyclic triisocyanate with the primary amine to make the polyurea compound, it is generally possible to use either the heterocyclic triisocyanate or the primary amine in excess of the stoichiometric amount. For example,
The ratio of the number of amino groups of the primary amine to the number of heterocyclic triisocyanate groups is 0.7 to 1.5, preferably 0.9 to 1.
It can be 1.

The reaction of the heterocyclic triisocyanate with the primary amine can generally be carried out by any selected method by mixing the reaction components and raising the temperature if necessary. This reaction is preferably performed at a temperature of 10 ° C to 150 ° C, more preferably 20 ° C to 80 ° C. Generally, the reaction components can be mixed by any selected method, but it is desirable to add the heterocyclic triisocyanate to the primary amine, and if necessary, it may be divided into several steps. Generally, this reaction is carried out with a solvent such as acetone, methyl isobutyl ketone, 1-methoxy-propanol-2,
It is carried out in the presence of an aliphatic hydrocarbon such as benzene, toluene, xylene, or petroleum ether.

The blending amount of the component (d) is (a) and (b).
A suitable range is 1 to 20 parts by weight, particularly 2 to 10 parts by weight, per 100 parts by weight of the total of the components.

(G-1) contains the above-mentioned components (a) and (b) as essential components and, if necessary, (c).
One or more selected from curing catalysts, (d) rheology control agents and the like can be contained, and in addition to these, solid color pigments, metallic pigments, light interference pigments, extender pigments, and ultraviolet absorbers. , Light stabilizer,
An anti-settling agent, a paint surface modifier, and other additives for paints may be added, and the present composition can be obtained by uniformly mixing these components with an organic solvent.

(G-1) is used as an organic solvent type high solids coating composition, and as the organic solvent, various coating organic solvents such as aromatic or aliphatic hydrocarbon solvents,
Alcohol-based solvents, ester-based solvents, ketone-based solvents, ether-based solvents, etc. can be used, and the solid content concentration is 80% by weight or more of high solid content at the time of coating, and preferably 8
5 to 98% by weight.

(G-1) has a solid content concentration of 80 during coating.
Since the viscosity is low enough to be applied even if it is more than wt%, it can be easily applied by airless spray, air spray, rotary atomization type coating method and the like. These coatings may be performed by applying static electricity. It is possible to form a coating film that is excellent in atomization by these coating methods, and that is excellent in smoothness, sharpness, and feeling of flesh.

(G-2): (a) A reaction product of a carboxyl group-containing compound and an epoxy group-containing compound, having a weight average molecular weight of 1,000 or less and a hydroxyl value of 200.
To 800, a hydroxyl group-containing compound, (b) a polyisocyanate compound, and (e) a melamine resin, and (c) a curing catalyst and / or (d) which are exemplified in the above (G-1) if necessary. A high-solids coating composition containing a rheology control agent.

(G-2) is a coating composition having a high solid content which forms a coating film having a low coating viscosity and excellent finish appearance, coating film hardness, acid rain resistance and scratch resistance. Of these, the components (a) and (b) can suitably use the components (a) and (b) exemplified in the above (G-1).

The melamine resin (e) is used as a cross-linking agent together with the component (b), and is a methylol compound obtained by reacting a part or all of the amino groups (--NH ₂ ) in the melamine molecule with an aldehyde. Melamine resins (including those containing imino group> NH in the molecule) can be mentioned. Formaldehyde, paraformaldehyde, acetaldehyde, benzaldehyde and the like can be used as the aldehyde. Alkyl etherified melamine resins obtained by etherifying a part or all of the methylol groups of this methylolated melamine resin (including those containing imino group> NH in the molecule) are also melamine resins. Can be used as Examples of the alcohol used for the etherification include methyl alcohol, ethyl alcohol, n-propyl alcohol, i-propyl alcohol, n-butyl alcohol and i-butyl alcohol.
Examples thereof include monovalent alcohols having 1 to 10 carbon atoms such as alcohol, 2-ethylbutanol and 2-ethylhexanol.
The number average molecular weight of the component (e) is preferably within the range of 150 to 3000. Among these, the use of a melamine resin containing an imino group is more preferable because it can improve the weather resistance of the coating film, especially the gloss retention.

(G-2) is the above-mentioned component (a),
It contains the component (b) and the component (e), and the ratio of these components is, for example, (a) based on the total solid content of the component (a), the component (b) and the component (e). Ingredient: 10
-60% by weight, especially 20-45% by weight, component (b): 3
0-70% by weight, especially 35-60% by weight, component (e):
The range of 3 to 40% by weight, particularly 5 to 30% by weight is suitable. The present composition can be prepared by blending these components in an organic solvent and uniformly mixing them.

(G-2) may contain (c) a curing catalyst and / or (d) a rheology control agent in addition to the components (a), (b) and (e). Is. The amount of component (c) used is (a),
When the total amount of the components (b) and (e) is 100 parts by weight, 0.
A range of 005 to 5 parts by weight, particularly 0.01 to 3 parts by weight is suitable. The blending amount of the component (d) is a solid content ratio,
1 to 20 parts by weight, particularly 2 to 10 parts by weight is suitable per 100 parts by weight of the total of the components (a), (b) and (e).

(G-2) is (a), (b) and (e)
In addition to the components, the components (c) and (or) (d) may be optionally contained, and further, solid color pigments, metallic pigments, light interference pigments,
An extender pigment, an ultraviolet absorber, a light stabilizer, an anti-settling agent, a coating surface adjusting agent, and other additives for paints can be added, and by uniformly mixing these components with an organic solvent (G -2) is obtained.

(G-2) is used as an organic solvent type high solids coating composition, and as the organic solvent, various coating organic solvents such as aromatic or aliphatic hydrocarbon solvents,
Alcohol-based solvents, ester-based solvents, ketone-based solvents, ether-based solvents, etc. can be used, and the solid content concentration is 80% by weight or more of high solid content at the time of coating, and preferably 8
5 to 98% by weight.

(G-2) has a solid content concentration of 80 during coating.
Even if it is more than weight%, it has a suitable viscosity for painting,
It can be easily applied by airless spray, air spray, rotary atomizing coating method, etc. These coatings may be carried out by applying static electricity, and it is possible to form a coating film which is excellent in atomization according to the coating method and which is excellent in smoothness, sharpness, and feeling of flesh.

(G-3): (a) A reaction product of a carboxyl group-containing compound and an epoxy group-containing compound, having a weight average molecular weight of 1,000 or less and a hydroxyl value of 200.
To 800, a hydroxyl group-containing compound, (b) polyisocyanate compound, (e) melamine resin, and (f) weight average molecular weight of 500 to 6000, and hydroxyl value of 50 to 60.
0 hydroxyl group-containing resin, and optionally (c) curing catalyst and / or) exemplified in the above (G-1).
(D) A high-solids coating composition containing a rheology control agent, capable of forming a coating having a low coating viscosity and excellent finish appearance, coating hardness, acid rain resistance and scratch resistance. it can. Of these ingredients,
Regarding the components (a), (b) and (e),
What was illustrated by (G-1) and (G-2) can be used conveniently.

Component (f): weight average molecular weight of 500 to 6
000, a hydroxyl group-containing resin having a hydroxyl value of 50 to 600, and particularly preferably a polyester resin, an acrylic resin or the like having a weight average molecular weight and a hydroxyl value within such a range, and the above (a) No ingredients are included.

The hydroxyl group-containing polyester resin can be produced by subjecting the carboxyl group of the polybasic acid and the hydroxyl group of the polyhydric alcohol to an esterification reaction. A polybasic acid is a compound having two or more carboxyl groups in one molecule, such as phthalic acid, isophthalic acid, terephthalic acid, succinic acid, adipic acid, azelaic acid, sebacic acid, tetrahydrophthalic acid, hexahydrophthalic acid. acid,
Examples thereof include het acid, maleic acid, fumaric acid, itaconic acid, trimellitic acid, pyromellitic acid, and their anhydrides. Polyhydric alcohol is a compound having two or more hydroxyl groups in one molecule, for example, ethylene glycol
1,2-propylene glycol, 1,2-butylene glycol, 2,3-butylene glycol, 1,2-hexanediol, 1,2-dihydroxycyclohexane, 3-ethoxypropane-1, Α-glycol such as 2-diol and 3-phenoxypropane-1,2-diol; neopentyl glycol, 2-methyl-1,3-
Propanediol, 2-methyl-2,4-pentanediol, 3-methyl-1,3-butanediol, 2-ethyl-1,3-hexanediol, 2,2-diethyl-
1,3-propanediol, 2,2,4-trimethyl-
1,3-pentanediol, 2-butyl-2-ethyl-
1,3-propanediol, 2-phenoxypropane-
1,3-diol, 2-methyl-2-phenylpropane-1,3-diol, 1,3-propylene glycol,
1,3-butylene glycol, 2-ethyl-1,3-octanediol, 1,3-didoxycyclohexane,
1,4-butanediol, 1,4-dihydroxycyclohexane, 1,5-pentanediol, 1,6-hexanediol, 2,5-hexanediol, 3-methyl-
1,5-pentanediol, 1,4-dimethylol cyclohexane, tricyclodecane dimethanol, 2,2-
Dimethyl-3-hydroxypropyl-2,2-dimethyl-3-hydroxypropionate (this is an esterified product of hydroxypivalic acid and neopentyl glycol), bisphenol A, bisphenol F, bis ( 4-hydroxyhexyl) -2,2-propane, bis (4-hydroxyhexyl) methane, 3,9-bis (1,1-dimethyl-2-hydroxyethyl) -2,
4,8,10-tetraoxaspiro [5,5] undecane, diethylene glycol, triethylene glycol,
Glycerin, diglycerin, triglycerin, pentaerythritol, dipentaerythritol, sorbite
Le, mannite, trimethylol-ethane, trimethylol-
Rupropane, ditrimethylolpropane, tris (2-
Hydroxyethyl) isocyanurate and the like.

The introduction of hydroxyl groups into the polyester resin is carried out by, for example, polyvalent alcohol having 3 or more hydroxyl groups in one molecule.
This can be done by using the

The hydroxyl group-containing acrylic resin can be produced, for example, by copolymerizing a polymerizable monomer component containing a hydroxyl group-containing polymerizable monomer and an acrylic monomer by a usual method.

The hydroxyl group-containing polymerizable monomer is a compound having at least one hydroxyl group and at least one polymerizable unsaturated bond in one molecule, and examples thereof include hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate. 2 to 2 carbon atoms such as hydroxypropyl and hydroxybutyl (meth) acrylate
Examples thereof include monoesters of 0 glycol and (meth) acrylic acid. The acrylic monomer is a monoester product of (meth) acrylic acid and a monovalent alcohol having 1 to 22 carbon atoms, such as methyl acrylate,
Methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, butyl acrylate, butyl methacrylate
G, hexyl acrylate, hexyl methacrylate,
Octyl acrylate, octyl methacrylate, lauryl acrylate, lauryl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, cyclohexyl (meth) acrylate, isobornyl ( (Meth) acrylate and the like.

In producing the hydroxyl group-containing acrylic resin,
Other polymerizable monomers other than the hydroxyl group-containing polymerizable monomer and the acrylic monomer can be used in combination.

Other monomers include, for example, methoxybutyl acrylate, methoxybutyl methacrylate,
(Meth) acrylic acid such as methoxyethyl acrylate and methoxyethyl methacrylate and alkoxy ester having 2 to 18 carbon atoms; N, N-dimethylaminoethyl acrylate, N, N-dimethylaminoethyl methacrylate Ray
N, N-diethylaminoethyl acrylate, N,
N-diethylaminoethyl methacrylate, Nt-butylaminoethyl acrylate, Nt-butylaminoethyl methacrylate, N, N-dimethylaminopropyl acrylate, N, N-dimethyl Aminoacrylic monomers such as aminopropyl methacrylate; acrylamide, methacrylamide, N-methylacrylamide,
Acrylamide monomers such as N-methyl methacrylamide, N-ethyl acrylamide, N-ethyl methacrylamide, N-butyl acrylamide, N-butyl methacrylamide, N-dimethyl acrylamide and N-dimethyl methacrylamide; glycidyl acrylate And glycidyl group-containing monomers such as glycidyl methacrylate;
Acrylic acid, methacrylic acid, maleic acid, itaconic acid,
Carboxylic group-containing polymerizable monomers such as fumaric acid, mesaconic acid and their anhydrides and half-esters; styrene, α-methylstyrene, vinyltoluene, acrylonitrile, vinyl acetate, “Veova 9”, “Veova” 10 "
(Each oil-shell epoxy), vinyl chloride and the like.

Further, a hydroxyl group-containing modified oligomer obtained by subjecting a polyhydric alcohol having two or more hydroxyl groups in one molecule to a lactone with a ring-opening esterification reaction can also be applied as the hydroxyl group-containing resin. As commercial products corresponding to these,
For example, "TONE 0200 Polyol", "T
"ONE 0301 Polyol", "TONE 030
5 Polyol "(these are all manufactured by Union Carbide Co., trade name)," Plaxel 205 "," Plaxel 303 "," Plaxel 305 "(these are all products manufactured by Daicel Chemical Industries, Ltd.) .

The weight average molecular weight of the component (f) is 500-6.
000, preferably 1000 to 5200, and a hydroxyl value of 5
0-600, preferably 80-200, and acid number 1
5 or less, especially 4 to 10 is suitable. When the weight average molecular weight of the component (f) is less than 500, the physical properties of the coating film deteriorate, and when it is more than 6000, high solidification becomes difficult, and when the hydroxyl value is less than 50, the curability of the coating film decreases. If it is larger, the compatibility with other components will be reduced, and thus both are not preferable.

(G-3) is the above-mentioned component (a),
It contains the component (f), the component (b) and the component (e), and the ratio of each of these components is not particularly limited and can be arbitrarily selected according to the purpose. For example, the component (a), ( f)
Based on the total solid content of the component, the component (b) and the component (e), the component (a): 5 to 50% by weight, particularly 10 to 40% by weight, the component (f): 5 to 50% by weight, particularly 10 -40% by weight, component (b): 30 to 70% by weight, particularly 40 to 60% by weight, component (e): 3 to 30% by weight, particularly 7 to 25% by weight are suitable. The present composition can be prepared by blending each component with an organic solvent and uniformly mixing them.

Further, in (G-3), in addition to these components (a), (f), (b) and (e),
Further, it is possible to contain the above-mentioned (c) curing catalyst and / or (d) rheology control agent. (C) Component amounts are (a), (f), (b) and (e)
A total amount of 0.005 to 5 parts by weight, particularly 0.01 to 3 parts by weight, is suitable per 100 parts by weight of the components.
The amount of the component (d) is 1 to 20 parts by weight, particularly 2 to 100 parts by weight of the total of the components (a), (f), (b) and (e).
A range of 10 parts by weight is suitable.

(G-3) is the above (a), (f),
The components (b) and (e) can be used as essential components, and if necessary, the components (c) and / or (d) can be added. In addition to these, solid color pigments, metallic pigments, and Interference pigments, extender pigments, ultraviolet absorbers,
It is possible to add a light stabilizer, an anti-settling agent, a coating surface adjusting agent, other additives for paints, etc. The present composition can be obtained by uniformly mixing these components with an organic solvent.

(G-3) is used as an organic solvent type high solids coating composition, and as the organic solvent, various coating organic solvents such as aromatic or aliphatic hydrocarbon solvents,
An alcohol solvent, an ester solvent, a ketone solvent, an ether solvent or the like can be used, and the solid content concentration is 80% by weight or more, preferably 85 to 98% by weight.

(G-3) has a solid content concentration of 80 during coating.
Since the viscosity is low enough to be applied even if it is more than wt%, it can be easily applied by airless spray, air spray, rotary atomization type coating method and the like. These coatings may be carried out by applying an electrostatic force, and it is possible to form a coating film which is excellent in atomization by these coating methods and which is excellent in smoothness, sharpness, and feeling of flesh.

(G-4): (a) A reaction product of a carboxyl group-containing compound and an epoxy group-containing compound, having a weight average molecular weight of 1,000 or less and a hydroxyl value of 200.
~ 800, (f) weight average molecular weight 500
To 6000 and a hydroxyl value of 50 to 600, a hydroxyl group-containing resin, (b) a polyisocyanate compound, (e) a melamine resin, and (g) an alkoxysilyl group-containing compound. And, if necessary, the above-mentioned (c) curing catalyst and / or
(D) A high solids coating composition containing a rheology control agent, which has a low viscosity and forms a coating having excellent finish appearance, coating hardness, acid rain resistance and scratch resistance. It is a coating composition.

Of these components, (a), (f),
The components (b) and (e) are the above (G-1) to (G-3).
Those exemplified in (4) can be preferably used.

Component (g): A compound having at least one alkoxysilyl group in one molecule, and the compounds exemplified below are preferable.

1) Dimethoxydimethylsilane, dimethoxydiethylsilane, dimethoxydiphenylsilane, diethoxydimethylsilane, trimethoxymethylsilane, trimethoxyethylsilane, trimethoxypropylsilane, trimethoxyphenylsilane, tetramethoxysilane, tetraethoxysilane, Non-functional alkoxysilane compounds such as tetrabutoxysilane and dimethoxydietosisilane, 2) γ-isocyanatopropyltrimethoxysilane,
γ-isocyanatopropylmethyldimethoxysilane,
Silane coupling agents such as β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, γ-aminopropyltriethoxysilane, 3) Vinyltrimethoxysilane, vinyltriethoxysilane, vinylmethyldimethoxysilane, vinylmethyldiethoxysilane, γ- (meth) acryloyloxypropyltrimethoxysilane, γ- (meth) acryloyloxypropylmethyldimethoxysilane, γ- ( (Meth) acryloyloxypropylmethyldiethoxysilane, γ
-(Meth) acryloyloxypropyltriethoxysilane, β- (meth) acryloyloxyethyltrimethoxysilane, γ- (meth) acryloyloxybutylphenyldimethoxysilane and other polymerizable unsaturated group-containing alkoxysilane compounds, 4) above 1 ) Nonfunctional alkoxysilane compound, 2)
A silane coupling agent, and 3) a siloxane bond-containing alkoxysilane compound obtained by partially condensing one or more alkoxysilyl group-containing compounds selected from the polymerizable unsaturated group-containing alkoxysilane compounds, 5) above 1) To 4) an acrylic resin, a polyester resin, an alkyd resin, a urethane resin or the like modified with one or more selected from the alkoxysilyl group-containing compounds, 6) the polymerizable unsaturated group-containing alkoxysilane compound of 3) above Polymers obtained by using one or two or more selected from the above, and optionally other polymerizable unsaturated monomers in combination.

The weight average molecular weight of these components (g) is 1
It is preferably in the range of 50 to 50,000, particularly 500 to 10,000.

(G-4) is a reaction product of the above-mentioned (a) a carboxyl group-containing compound and an epoxy group-containing compound, and has a weight average molecular weight of 1,000 or less and a hydroxyl value of 200 to 800. , (F) a hydroxyl group-containing resin having a weight average molecular weight of 500 to 6000 and a hydroxyl value of 50 to 600, (b) a polyisocyanate compound,
(E) It contains a melamine resin and (g) an alkoxysilyl group-containing compound, and the ratio of each of these components is not particularly limited and can be arbitrarily selected according to the purpose.
Based on the total solid content of the components (a), (f), (b), (e) and (g), the component (a): 5 to 50% by weight, particularly 10 to 40% by weight, the component (f). : 5 to 50% by weight, especially 10 to 40% by weight, component (b): 30 to 70% by weight, especially 40 to 60% by weight, component (e): 3 to 30% by weight, especially 7 to 25% by weight, (G) Component 1 to 30% by weight, especially 3
It is suitable to be in the range of from 15 to 15% by weight, and the present composition can be prepared by blending these components in an organic solvent and mixing them uniformly.

Further, in (G-4), these (a),
In addition to the components (f), (b), (e) and (g), it is possible to further contain the above-mentioned (c) curing catalyst and / or (d) rheology control agent.
The amount of the component (c) used is (a), (f), (b),
Per 100 parts by weight of the total of components (e) and (g), 0.
A range of 005 to 5 parts by weight, particularly 0.01 to 3 parts by weight is suitable. The blending amount of the component (d) is (a), (f),
1 to 20 parts by weight, particularly 2 to 10 parts by weight is suitable per 100 parts by weight of the total of the components (b), (e) and (g).

(G-4) is the above (a), (f),
The components (b), (e) and (g) are essential components and, if necessary, the components (c) and / or (d) can be added. In addition to these, solid color pigments , A metallic pigment, a light interference pigment, an extender pigment, a UV absorber, a light stabilizer, an anti-settling agent, a coating surface adjusting agent, it is also possible to include other paint additives,
The present composition can be obtained by uniformly mixing these components with an organic solvent.

(G-4) is used as an organic solvent type high solids coating composition, and as the organic solvent, various coating organic solvents such as aromatic or aliphatic hydrocarbon solvents,
Alcohol-based solvents, ester-based solvents, ketone-based solvents, ether-based solvents and the like can be used. The solid content concentration at the time of coating (G-4) is a high solid content of 80% by weight or more,
It is preferably 85 to 98% by weight.

(G-4) has a solid content concentration of 80 during coating.
Since the viscosity is low enough to be applied even if it is more than wt%, it can be easily applied by airless spray, air spray, rotary atomization type coating method and the like. These coatings may be carried out by applying an electrostatic force, and it is possible to form a coating film which is excellent in atomization by these coating methods and which is excellent in smoothness, sharpness, and feeling of flesh.

(G-5): (h) Weight average molecular weight is 10
00 or less and a hydroxyl group-containing lactone-modified oligomer having a hydroxyl value of 200 to 800: 5 to 30% by weight, (f) a weight average molecular weight of 1000 to 6000, and a hydroxyl value of 50.
-200 hydroxyl group-containing resin: 5-50% by weight, (b) polyisocyanate compound: 30-70% by weight, (e) melamine resin: 3-30% by weight, and (g) alkoxysilyl group-containing compound 1-30% by weight. A high solids coating composition containing a composition consisting of (c) a curing catalyst and / or (d) a rheology control agent as described above, which may be added as a coating composition. It is possible to form a coating film having a low viscosity and excellent finish appearance, coating film hardness, acid rain resistance and scratch resistance.

Of these components, (f), (b),
The components (e) and (g) are the same as the components (G-1) to (G-) above.
What was illustrated by 4) can be used conveniently.

Component (h): a hydroxyl group-containing lactone-modified oligomer having a weight average molecular weight of 1,000 or less and a hydroxyl value of 200 to 800, such as a polyvalent hydroxyl compound having two or more hydroxyl groups in one molecule and a lactone It can be obtained by subjecting compounds to a ring-opening esterification reaction.

The polyvalent hydroxyl compound is a compound having two or more hydroxyl groups in one molecule, and examples thereof include ethylene glycol, 1,2-propylene glycol, 1,2-butylene glycol and 2,3-butylene glycol. , 1, 2
-Hexanediol, 1,2-dihydroxycyclohexane, pinacol, hydrolyzate of long-chain alkyl monoepoxide, aliphatic monoglyceride [eg, glycerin monoacetate (α-form), glycerin monostearate (α-form), etc.], Α-glycols such as 3-ethoxypropane-1,2-diol and 3-phenoxypropane-1,2-diol; neopentyl glycol, 2-methyl-1,3-propanediol, 2-methyl- 2,4-
Pentanediol, 3-methyl-1,3-butanedio-
2-ethyl-1,3-hexanediol, 2,2-
Diethyl-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-butyl-2
-Ethyl-1,3-propanediol, 2-phenoxypropane-1,3-diol, 2-methyl-2-phenylpropane-1,3-diol, 1,3-propylene glycol, 1,3 -Butylene glycol, dimethylolpropynoic acid, dimethylolbutanoic acid, 2-ethyl-1,3
-Octanediol, 1,3-didoxycyclohexane, aliphatic monoglyceride (for example, glycerin monoacetate (β form) and glycerin stearate (β form)
, Etc.) and the like.

Further, these α-glycol and β-
Other than glycol, 1,4-butanediol, 1,4-
Dihydroxycyclohexane, 1,5-pentanediol, 1,6-hexanediol, 2,5-hexanediol, 3-methyl-1,5-pentanediol, 1,4
-Dimethylol cyclohexane, tricyclodecane dimethanol, 2,2-dimethyl-3-hydroxypropyl-2,2-dimethyl-3-hydroxypropionate (this is hydroxypivalic acid and neopentylglycol- Is an esterification product with bisphenol), bisphenol A, bisphenol F, bis (4-hydroxyhexyl)-
2,2-propane, bis (4-hydroxyhexyl) methane, 3,9-bis (1,1-dimethyl-2-hydroxyethyl) -2,4,8,10-tetraoxaspiro [5,5] undecane, Diethylene glycol, triethylene glycol, tetra or higher polyethylene glycol
, A copolymer having a hydroxyl group at both terminals formed by copolymerizing ethylene oxide and propylene oxide, a linear polyester having a hydroxyl group at both terminal groups, a polycarbonate-diol, a carboxylic acid adduct of diepoxide. And the like can also be applied as the polyvalent hydroxyl compound.

Further, glycerin, diglycerin, triglycerin, pentaerythritol, dipentaerythritol, sorbitol, mannite, trimethylolethane, trimethylolpropane, ditrimethylolpropane, tris (2-hydroxy). Ethyl) isocyanurate
Gluconic acid, polymer containing three or more hydroxyl groups
(For example, a polyester resin having three or more hydroxyl groups,
Polyether resin, acrylic resin, ketone resin, phenol resin, epoxy resin, urethane resin, saponified polyvinyl acetate resin, polyvinyl alcohol, natural sugars such as glucose, etc.) are also polyvalent hydroxyl compounds. Can be applied as

Further, a hydroxyl group-containing ester compound or polyester compound obtained by reacting these polyvalent hydroxyl compound with a polybasic acid; a product obtained by esterifying a carboxyl group-containing compound with an epoxy group-containing compound or resin; epoxy An oligomer such as a product obtained by ether-reacting a group-containing compound or a resin with a hydroxyl-containing compound can also be applied as the polyvalent hydroxyl compound.

Lactones to be reacted with these polyvalent hydroxyl compounds are cyclic compounds having an ester group (-CO-O-) in the ring, and the number of members of the ring is 3 to 10, especially 4 to 7.
Is preferable, and specifically, for example, β-propiolactone, γ-butyrolactone, δ-valerolactone, ε-caprolactone, enanthlactone, 3-methyl-β-propiolactone, 3-methyl. -Γ-butyrolactone, 3-methyl-δ-valerolactone, 3-methyl-ε-caprolactone, 4-methyl-ε-caprolactone, 3,3,5-trimethyl-ε-caprolactone and the like, and particularly ε-caprolactone , 3-methyl-ε
-Caprolactone, 4-methyl-ε-caprolactone and the like are preferable.

The ring-opening esterification reaction of the polyvalent hydroxyl compound and the lactone can be carried out by a ring-opening esterification reaction known per se. For example, the reaction temperature is 80 to 1
A temperature in the range of 80 ° C. is suitable, and in order to promote this reaction, a catalyst such as tetraalkoxy titanium, an organometallic compound such as an organotin compound, a Lewis acid, a protic acid, or the like can be used. Is 0.005 per 100 parts by weight of the total of the polyvalent hydroxyl compound and the lactone.
~ 3 parts by weight are suitable.

The component (h) itself is already known and commercially available. For example, "TONE 0200
Polyol "," TONE 0301 Polyo
l "," TONE 0305 Polyol "(these are all manufactured by Union Carbide Co., trade name)," Plaxel 205 "," Plaxel 303 "," Plaxel 305 "(these are all trade names by Daicel Chemical Industries, Ltd.) And so on.

The component (h) has a weight average molecular weight of 1
000 or less, particularly 500 to 1000, and a hydroxyl value of 200
It is preferable to be included in the range of -800, especially 300-600.

(G-5) is the above-mentioned component (h), (f)
Ingredient, (b) ingredient, (e) ingredient and (g) ingredient are made into an essential ingredient, and also (c) ingredient and (or) as needed.
The component (d) can be contained, and in addition to this,
Furthermore, solid color pigments, metallic pigments, light interference pigments, extender pigments, ultraviolet absorbers, light stabilizers, anti-settling agents,
It is also possible to contain a paint surface modifier and other additives for paints, and the present composition can be obtained by uniformly mixing these components with an organic solvent.

The composition ratio of each component in (G-5) is
In terms of solid content, (h) weight-average molecular weight of 1000 or less, hydroxyl group-containing lactone-modified oligomer having a hydroxyl value of 200 to 800: 5 to 30% by weight, preferably 10 to 25% by weight, (f) weight-average molecular weight of 1000 -6000, hydroxyl group-containing resin having a hydroxyl value of 50-200: 5-50% by weight, preferably 10-40% by weight, (b) polyisocyanate compound: 30-70% by weight, preferably 40-6
0% by weight, (e) melamine resin: 3 to 30% by weight, preferably 7 to 25% by weight and (g) alkoxysilyl group-containing compound: 1 to 30% by weight, preferably 3 to 15% by weight
The range of is preferable. It can be prepared by blending the composition consisting of (3) with an organic solvent and mixing them uniformly.
The amount of the component (c) used is 0.005 to 5 parts by weight per 100 parts by weight of the total solid content of the components (h), (f), (b), (e) and (g). Parts, especially within the range of 0.01 to 3 parts by weight. The blending amount of the component (d) is such that the component (h), the component (f), the component (b),
1 to 20 parts by weight, particularly 2 to 10 parts by weight is suitable per 100 parts by weight of the total solid content of the components (e) and (g).

(G-5) is used as an organic solvent type high solids coating composition, and as the organic solvent, various coating organic solvents such as aromatic or aliphatic hydrocarbon solvents,
Alcohol-based solvents, ester-based solvents, ketone-based solvents, ether-based solvents and the like can be used, and the solid content concentration at the time of coating is 80% by weight or more, preferably 85 to 98% by weight.

(G-5) has a solid content concentration of 80 during coating.
Since the viscosity is low enough to be applied even if it is more than wt%, it can be easily applied by airless spray, air spray, rotary atomization type coating method and the like. These coatings may be carried out by applying an electrostatic force, and it is possible to form a coating film which is excellent in atomization by these coating methods and which is excellent in smoothness, sharpness, and feeling of flesh.

(G-6): Acrylic resin, polyester resin having two or more polymerizable unsaturated bonds in one molecule
An actinic radiation-curable coating composition containing urethane resin, fluorine-containing resin or the like and one or more polymerizable unsaturated monomers in one molecule, such as acrylic acid ester, methacrylic acid ester, styrene, acrylonitrile, etc. as a main component.
In (G-6), an organic solvent is not an essential component, but examples of the organic solvent include aromatic or aliphatic hydrocarbon solvents, alcohol solvents, ester solvents, ketone solvents, ether solvents and the like. It can be used, and the solid content concentration at the time of coating is 80% by weight or more, preferably 85 to 100% by weight.

(G-7): An acrylic resin, a polyester resin, a urethane resin having a crosslinkable functional group such as a hydroxyl group in the active energy radiation-curable coating composition of (G-6) above.
A high solids coating composition capable of being cured by active energy and heating, which is obtained by mixing a base resin such as a silicone resin and a thermosetting resin comprising a polyisocyanate compound, a blocked polyisocyanate compound, and a crosslinking agent such as a melamine resin. In (G-7), an organic solvent is not an essential component, but examples of the organic solvent include aromatic or aliphatic hydrocarbon solvents, alcohol solvents, ester solvents,
A ketone solvent, an ether solvent, or the like can be used, and the solid content concentration at the time of coating is 80% by weight or more, preferably 85 to
It is 100% by weight.

In this method, the plastic film (D) of the coated automobile part (E) obtained by sticking the colored plastic film (C) and the plastic film (D).
The finished appearance (smoothness, sharpness, glossiness, etc.) can be further improved by applying the above-mentioned high solid content type top coating composition (H) to the surface of the.

These high solid content type top coating materials (G) are
Coated automobile parts (E) formed by sticking a colored plastic film (C) and a clear plastic film (D)
It is preferable to coat the surface of the clear plastic film (D) on the outside of the. The coating can be performed by air spraying, airless spraying, electrostatic coating, or the like, and the film thickness is preferably in the range of 5 to 200 μm, particularly 15 to 150 μm, and the coating film has ultraviolet irradiation, electron beam irradiation, or 1
It can be cured by heating at 00 to 200 ° C. for about 10 to 40 minutes.

Using the coated automobile parts (E) obtained by coating the high solid content type top coating composition (G) in this way, underbody, side members, roofs, cowls, upper backs,
Main body consisting of lower back, etc., as well as outer covers such as hood, front balance, front fender, cowl louver, door, luggage (back door), bumper, spoiler, garnish, side protector, tire house. To manufacture.

Specifically, the main body is manufactured by forming and joining the respective members such as the underbody, the side member, the roof, the cowl, the upper back and the lower back. Cutting, molding, joining and the like can be performed by known methods. At least the outside of the main body molded in this way has a plastic film (C).
And (D). Similarly, outer coverings such as hoods, front balances, front fenders, cowl louvers, doors, luggage, bumpers, spoilers, garnishes, side protectors, and tire houses are also manufactured using coated automobile parts (E). can do.
These cutting, molding, joining and the like can be performed by methods known per se. By forming a shell body (automobile body) composed of a main body and an outer cover using the coated automobile part (E), the automobile body intended by the present invention is formed.

Further, in this method, the car body part (B) is used.
After applying the intermediate coating as required, only the colored plastic film (C) is applied to the outer surface as described above, and then the clear plastic film (D) is not applied Plastic film (C)
High solid content top coat (G) is sprayed on the surface of
By forming a shell body (vehicle body) composed of a main body and an outer lid by using a coated automobile part (F2) coated by airless spray, electrostatic coating, or the like, an automobile body aimed at by the present invention can be obtained. It is formed.
The coating film thickness of the high solid content type top coating composition (G) is preferably in the range of 5 to 200 μm, particularly 15 to 150 μm, based on the cured coating film, and the coating film is irradiated with ultraviolet rays, electron beams or 100 It can be cured by heating at about 200 ° C. for about 10 to 40 minutes.

[0127]

According to the method of the present invention described above,
The following effects can be obtained.

In an automobile body assembly line, a molded automobile body component is used, and after a colored film and a clear film are attached to the outer portion, a hood panel, a fender panel, a door panel,
Since we manufacture outer lids such as luggage door panels, bumpers, spoilers, garnishes, side protectors, tire houses and main bodies consisting of underbody, side members, roof, cowl, upper back, lower back, etc., The amount of paint used was significantly reduced compared to the past. As a result, the amount of VOC (volatile organic compound) used in the automobile body manufacturing line can be significantly reduced, and moreover, it is possible to reduce the number of processes, energy and CO2 in the coating line.

Moreover, due to the characteristics of the plastic film, it is possible to further improve the chipping resistance, corrosion resistance, designability, and finished appearance of the overall coating film.

[0130]

EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples. All parts and percentages are by weight, and the film thickness of the coating film is that of the cured coating film.

1. EXAMPLES AND COMPARATIVE EXAMPLES Example 1 Polyetheretherketone (PEEK) granules are injection-molded to form underbody, side member, roof, cowl, upper back and lower back parts constituting the main body. Model (size is about 1/25 of the actual size)
Was manufactured in advance. Similarly, injection molding of polyetheretherketone (PEEK) granules, such as hoods, fenders, doors, luggage doors, bumpers, spoilers, garnishes, side protectors, tire houses, etc. A model of each part (size is about 1/25 of the actual size) was manufactured.

Then, an acrylic resin film (thickness: 25 μm) containing an aluminum metallic pigment and a colorless and transparent acrylic resin film (thickness: 50 μm) were laminated on the outer surface of these models one by one. The resulting multilayer film was attached by thermocompression to form a coated automobile part (E).

The underbody, side member, and rule formed by using the film-attached automobile parts thus obtained
Assemble the model of the hood, cowl, upper back and lower back to form the main body, and assemble the model of the hood, fender, door, luggage door, bumper, spoiler, garnish, side protector and tire house to form the outer cover. Then, the main body and the outer lid were combined to form an automobile body (shell body).

Example 2 An automobile body (shell body) was formed in the same manner as in Example 1 except that the granular particles of a copolymer of acrylonitrile / styrene / acrylic acid ester were used.

Example 3 A particle model of polyetheretherketone (PEEK) was injection-molded to form a model of each part of the underbody, side member, roof, cowl, upper back and lower back which constitutes the main body. (Size is about 1/25 of the actual size)
Was manufactured in advance. Similarly, injection molding of polyetheretherketone (PEEK) granules, such as hoods, fenders, doors, luggage doors, bumpers, spoilers, garnishes, side protectors, tire houses, etc. A model of each part (size is about 1/25 of the actual size) was manufactured.

Then, an acrylic resin film (thickness: 25 μm) containing an aluminum metallic pigment and a colorless and transparent acrylic resin film (thickness: 50 μm) were laminated on the outer surface of each of the models one by one. The resulting multi-layer film is attached by thermocompression bonding, and a UV irradiation curable high solid content clear coating (Note 1) is applied on the surface of the attached film to a film thickness of 30 μm, and an ultraviolet irradiation device (80 W / cm2 Of metal halide lamp)
J / cm2 (0.25 minutes) was irradiated and the coating film was cured to form a coated automobile part (E).

The underbody, side member, and rue formed by using the coated automobile parts (E) thus obtained.
Assemble models such as hood, cowl, upper back and lower back to form the main body, and assemble models such as hood, fender, door, luggage door, bumper, spoiler, garnish, side protector and tire house to form the outer cover. Then, the main body and the outer lid were joined to form an automobile body (shell body).

(Note 1) Ultraviolet irradiation curable high solid content type clear coating: Isophorone diisocyanate 444 was placed in the reaction vessel.
And 232 parts of 2-hydroxyethyl acrylate were charged, and the mixture was reacted at 80 ° C. for 5 hours while blowing air, and after confirming that no unreacted 2-hydroxyethyl acrylate remained, the polyester resin (phthalic anhydride 296 Part, 292 parts of adipic acid, 124 parts of ethylene glycol, and 312 parts of neopentyl glycol are reacted to give a number average molecular weight of 880 and a hydroxyl value of 127) 888.
Parts were added and reacted at 80 ° C. for 7 hours. After confirming that the isocyanate groups were almost consumed by the reaction, isobutyl acetate was added and cooled to obtain an unsaturated resin solution having a solid content of 85%.

Per 70 parts of this unsaturated resin solution, 50 parts of butyl acrylate, 10 parts of trimethylolpropane triacrylate, 4 parts of Irgacure 819 (trade name, photopolymerization initiator, manufactured by Ciba Specialty Chemicals), Sumidule N75 (Sumitomo N75) 10 parts of a polyisocyanate compound, trade name, manufactured by Bayer Urethane Co., Ltd. was added to obtain an ultraviolet irradiation curable high solid content type clear coating material.

Example 4 An underbody, a side member, a roof, and a cowl constituting a main body were used in the same manner as in Example 1 by using a granular material of a copolymer of acrylonitrile / styrene / acrylic acid ester. , Models of upper back and lower back parts (the size of which is about 1/25 of the actual size) were manufactured in advance. Further, similarly, a granular material of a copolymer composed of acrylonitrile / styrene / acrylic acid ester is injection-molded to form a lid, a hood, a fender, a door, a luggage door, a bumper, a spoiler, a garnish, a side protector. , A model of each part such as a tire house (size is about 1/25 of the actual size) was manufactured.

Then, an acrylic resin film (thickness: 25 μm) containing an aluminum metallic pigment was attached by thermocompression bonding to the outer surface of these models, and the surface of the adhered film was cured by UV irradiation. Type high-solids type clear paint (Note 1) is applied to a film thickness of 30 μm, and 500 mJ / cm2 (0.25 minutes) is irradiated with an ultraviolet irradiation device (80 W / cm2 metal halide lamp),
The coating film was cured to form a coated automobile part (E).

Underbody, side member, and ruler formed by using the coated automobile part (E) thus obtained.
Assemble models such as hood, cowl, upper back and lower back to form the main body, and assemble models such as hood, fender, door, luggage door, bumper, spoiler, garnish, side protector and tire house to form the outer cover. Then, the main body and the outer lid were joined to form an automobile body (shell body).

Example 5 A particle of polyetheretherketone (PEEK) was injection-molded to form a model of each part of the underbody, side member, roof, cowl, upper back and lower back which constitutes the main body. (Size is about 1/25 of the actual size)
Was manufactured in advance. Similarly, injection molding of polyetheretherketone (PEEK) granules, such as hoods, fenders, doors, luggage doors, bumpers, spoilers, garnishes, side protectors, tire houses, etc. A model of each part (size is about 1/25 of the actual size) was manufactured.

Then, on the outer surface of these models, an intermediate powder coating material (“Evacrat 5600D” was used.
K ”, manufactured by Kansai Paint Co., Ltd.) with a film thickness of 50 μm, heated at 160 ° C. for 30 minutes to cure, and then an acrylic resin film (thickness: 25 μm) containing an aluminum metallic pigment on its surface. A multi-layer film obtained by laminating one layer each of a colorless transparent acrylic resin film (thickness: 50 μm) is attached by thermocompression bonding, and further ultraviolet irradiation curing type high solid content type clear coating ( Note 1) is applied to a film thickness of 30 μm, and 500 m with an ultraviolet irradiation device (80 W / cm2 metal halide lamp)
J / cm2 (0.25 minutes) was irradiated and the coating film was cured to form a coated automobile part (E).

The underbody, side member, and rule formed by using the coated automobile parts (E) thus obtained
Assemble models such as hood, cowl, upper back and lower back to form the main body, and assemble models such as hood, fender, door, luggage door, bumper, spoiler, garnish, side protector and tire house to form the outer cover. Then, the main body and the outer lid were joined to form an automobile body (shell body).

Example 6 Granules of a copolymer of acrylonitrile / styrene / acrylic acid ester were injection-molded to obtain an underbody, a side member, a roof, a cowl, an upper back and a lower back constituting a main body. A model of each part (size is about 1/25 of the actual size) was manufactured in advance. Similarly, injection molding of polyetheretherketone (PEEK) granules, such as hoods, fenders, doors, luggage doors, bumpers, spoilers, garnishes, side protectors, tire houses, etc. A model of each part (size is about 1/25 of the actual size) was manufactured.

Then, on the outer surface of these models, an intermediate powder coating material (“Evacrat 5600D” was used.
K ”, manufactured by Kansai Paint Co., Ltd.) with a film thickness of 50 μm, heated at 160 ° C. for 30 minutes to cure, and then an acrylic resin film (thickness: 25 μm) containing an aluminum metallic pigment on its surface. A multi-layer film obtained by laminating one layer each of a colorless transparent acrylic resin film (thickness: 50 μm) is attached by thermocompression bonding, and further ultraviolet irradiation curing type high solid content type clear coating ( Note 1) is applied to a film thickness of 30 μm, and 500 m with an ultraviolet irradiation device (80 W / cm2 metal halide lamp)
J / cm2 (0.25 minutes) was irradiated and the coating film was cured to form a coated automobile part (E).

The underbody, side member, and rue formed by using the coated automobile parts (E) thus obtained.
Assemble models such as hood, cowl, upper back and lower back to form the main body, and assemble models such as hood, fender, door, luggage door, bumper, spoiler, garnish, side protector and tire house to form the outer cover. Then, the main body and the outer lid were joined to form an automobile body (shell body).

Comparative Example 1 In an automobile assembly line, a 0.8 mm-thick degreasing treatment and a zinc phosphate chemical conversion treatment ("PB # 3080 treatment", trade name, manufactured by Nippon Parkerizing Co., Ltd.), unpainted cold rolling. A model of each part of the underbody, side member, roof, cowl, upper back, lower back that composes the main body by cutting, molding and joining steel plates (size is about 1/25 of the actual size) Is manufactured in advance. Similarly, models of parts such as hoods, fenders, doors, luggage doors, bumpers, spoilers, garnishes, side protectors, tire houses, etc. that make up the outer lid (size is about 1/25 of the actual size). Also manufactured.

A main body and an outer lid are formed by combining these respective parts, and the two are combined to form an automobile body, which is immersed in the bath of the above-mentioned cationic electrodeposition paint to obtain an electrodeposition bath temperature of 28. ℃, voltage 250V, total immersion time 2
The coating was applied on both sides under the condition of 1 minute, washed with water, and then heated at 170 ° C. for 30 minutes to cure the electrodeposition coating film (film thickness of the flat portion of the electrodeposition coating film was 20 μm).

Next, an intermediate coating (“E
S primer ", manufactured by Kansai Paint Co., Ltd., product name, polyester resin / melamine resin type) to a film thickness of 20 μm, and heated at 140 ° C. for 30 minutes to cure,
Further, a metallic paint ((“Magiclon Silver”, manufactured by Kansai Paint Co., Ltd., trade name, acrylic resin / melamine resin type) is applied to a film thickness of 15 μm, and the clear paint (““ Magiclon Kriya ",
Kansai Paint Co., Ltd., trade name, acrylic resin / melamine resin) was applied to a film thickness of 45 μm, and heated at 140 ° C. for 30 minutes to cure.

3. Performance Test Results Various performance tests were performed on the coated steel sheets obtained by performing the flat plate in the same steps as in the examples and comparative examples. The results are shown in Table 1.
Shown in.

[0153]

[Table 1]

The test methods in Table 1 are as follows.

[0155] Coating film appearance: visual evaluation, swelling in the upper layer coating surface, the result of visual observation of the presence or absence of occurrence of dents, ○ is blistering were not observed occurrence of dents, ○ ^- it is blistering, Occurrence of dents and the like is slightly observed, Δ indicates that blisters and dents are slightly observed, and x indicates that dents and the like are frequently observed. "Web scan" is a product name of BYK, and is a result of measuring a short wave value using this, and the smaller the value, the better the smoothness.

Acid resistance: This is the result of visual observation of the coated surface state after the test plate was immersed in a 40% sulfuric acid aqueous solution at 80 ° C. for 10 minutes. O indicates that no blisters or dents were found at all, Δ indicates that blisters or dents were found to occur a little more frequently, and x indicates that more dents were found.

Weather resistance: This is the result of visual observation of the coated surface of the test plate after the 800-hour sunshine weather meter test. ○: No blister, dent, etc. were observed at all, ○ ^―: Slight blister, dent, etc. were observed, △: Some blister, dent, etc. were observed, ×: Many dents, etc. were observed Indicates that it is recognized.

VOC amount: This is the result of estimating the VOC amount, which is considered to occur in the process from the state of the steel sheet to the assembling of the automobile body, on the basis of Comparative Example 1. ○ has become very small, ○ ^- is a little inferior to ○, △ it became somewhat less, indicating that the × does not change almost.

Claims (4)

[Claims] 1. An automobile body part (B) is formed by cutting and / or molding a plastic (A), and the part (B) is formed.
A method for manufacturing an automobile body, comprising assembling an automobile body using a coated automobile part (E) obtained by attaching a colored plastic film (C) and a clear plastic film (D) to at least the outer surface of the above. 2. An automobile body according to claim 1, further comprising precoating an intermediate coating material (F) on at least an outer surface of the automobile body part (B) prior to attaching the colored plastic film (D). Manufacturing method. 3. A colored plastic film (C) and a clear plastic film (D) are adhered to at least the outer surface of an automobile body part (B), and the clear plastic film (D) surface of the outer surface is coated at the time of coating. The method for producing an automobile body according to claim 1 or 2, which comprises using a coated automobile part (E) obtained by coating a high solids type paint (G) having a solid content of 80% by weight or more. 4. A coated automobile part (E) obtained by coating a high solids type coating material (G) having a solids content of 80% by weight or more at the time of coating, instead of attaching the clear plastic film (D). A method for assembling an automobile body using
4. The method for manufacturing an automobile body according to any one of 3 above.