KR101944706B1 - Repair painting method for vehicle - Google Patents

Abstract

The present invention relates to a coating repairing method of a vehicle. The method comprises: (A) a lower coating step of performing rust prevention and surface fitting on a coating repaired portion of a vehicle body; (B) a middle coating step of protecting the treated portion by the lower coating step and increasing the efficiency for upper painting; and (C) an upper painting step of applying a base coat and a clear coat sequentially on the coating repaired portion of the vehicle after the middle coating step and providing gloss after realizing the color. According to the present invention, the coating quality can be enhanced.

Description

REPAIR PAINTING METHOD FOR VEHICLE [0002]

The present invention relates to a method for repairing a vehicle, and more particularly, to a repair coating method using a water-soluble paint, thereby enabling an environmentally friendly coating process to be carried out, minimizing peeling and dropping of the coating film, The present invention relates to a method for repairing a vehicle,

Generally, when driving the vehicle, it is often difficult to maintain the appearance of the vehicle body at the time of shipment due to a contact accident or collision.

If the appearance of the vehicle is damaged due to a contact accident or collision of the vehicle, the maintenance workshop will use the painting equipment to perform the repair work. Most of the painting work including the repair work is performed using the spray gun connected to the compressor There are reports that the temperature and humidity affect the color and quality of the painting.

Accordingly, the painting work including the repair painting is a work requiring a high level in order to improve and maintain the appearance of the vehicle. Especially, it is required to maintain the gloss and color of the paint film and to have aesthetics.

That is, the repair painting of the vehicle is a painting operation performed for repairing a damaged part of a vehicle in the event of a contact accident or a collision, and the coloring should be adjusted to the maximum color according to the original color of the vehicle.

In recent years, regulations for organic compounds have been strengthened around the world. In recent years, the use of water-soluble paints using water instead of organic solvents has been gradually expanded. And encourages the use of environmentally friendly water-soluble paints for the safety and health of workers as well as environmental protection.

However, water-soluble paints using water as a solvent have drawbacks in that they are more susceptible to color changes depending on the use conditions and the coating environment than the oil-based paints, which makes it difficult to improve the paint quality of the vehicle.

Korean Patent Publication No. 10-1587040 Korean Registered Patent No. 10-1757316

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and conceived to solve the above-mentioned problems. It is an object of the present invention to provide a water- And it is an object of the present invention to provide a repair coating method of a vehicle that can improve paint quality by providing excellent durability.

The present invention can prevent the occurrence of color discoloration after application and drying of a base coat, which is a color paint, by controlling the humidity in the booth according to the use of a water-soluble paint, and to prevent paint defects due to water- And to provide a repair paint method for a vehicle.

According to an aspect of the present invention, there is provided a method of painting a vehicle, the method comprising: providing a booth having a closed space for coating a vehicle, and dusts contained in air supplied and supplied with fresh air into the booth An impurity removing filter portion for removing dust or impurities in the air introduced into the booth, a preheating portion for maintaining a predetermined temperature by heating the inside of the booth, A floor dust removing unit for removing dust falling to the floor during coating using the spray gun in the booth, a dust removing unit for removing dust generated during painting using the spray gun in the booth, And a coating paint dust odor removing unit for removing odors, In the repair coating method of the vehicle to perform a chapter, (A) step for performing matching anti-corrosive primer and a surface for the repair coating part of the vehicle body; (B) a middle stage which protects the treated portion by the sub-step and increases the efficiency for top painting; (C) a topping step of successively applying a base coat and a clear coat to a repair painting portion of the vehicle after completion of the intermediate stage to reproduce a color and then to provide gloss; and in the toping step, A first step of removing dust and oil by processing to prevent a coating film failure; A second step of removing fine dust and foreign matter from the repair coating part using a feeder cloth; A third step of preheating the inside of the booth to a temperature of 35 to 40 ° C through the preheating part and adjusting the relative humidity in the booth to 40 to 70%; A fourth step of applying a basecoat for realizing the color of the vehicle body and concealment of the repair painting part with the repair painting part; A fifth step of drying and curing the base coat applied at 55 to 65 ° C for 20 to 30 minutes through the drying unit; A preheating step of heating the inside of the booth to a temperature of 35 to 40 ° C through the preheating part; A seventh step of applying a clearcoat to the upper surface of the base coat coating film to improve gloss and appearance and durability; And drying and curing the clearcoat applied at 55 to 65 ° C for 30 to 40 minutes through the drying unit, wherein the base coat comprises 5 to 80 parts by weight of the pigment, 100 parts by weight of the additive 10 to 120 parts by weight of water, and 450 to 500 parts by weight of distilled water of ultra pure water; The booth is made of a urethane panel having excellent heat insulation performance and durability in order to maintain the internal temperature and to minimize heat loss. The drying unit is composed of a movable far-infrared ray drier or a microwave dryer, and the spray gun is connected with an air transformer .

Here, the water-soluble resin may be at least one selected from the group consisting of alkyd resins, melamine formaldehyde resins, aminoalkyd resins, urethane alkyd resins, acrylic alkyd resins, fatty acid-containing urethane resins mixed with a polyester resin modified with semi-drying or non- A modified water-dispersed alkyd polyol resin, and a dimethylol propionic acid having a carboxyl group and a hydroxyl group are used; Wherein the additive is selected from the group consisting of polyoxyethylene alkyl ether having polyoxyethylene chain, polyoxyethylene alkylphenyl ether, polyoxyethylene polyoxypropylene alkyl ether and nonionic surfactant having polyglycerol ester having hydroxyl group; The ultrapure distilled water is distilled water in which industrial water is passed through an ion exchange resin column to remove positive ions and negative ions, and it is possible to prevent the occurrence of blisters in the film due to ions in water molecules.

Herein, the clear coat contains an acrylic monomer having a solid content of 40 to 70 wt%, a weight average molecular weight of 8000 to 10000 Mw and a glass transition temperature of 10 to 30 DEG C, the main material being an acrylic monomer having a carboxylic acid, At least one selected from an acrylic monomer, a silane-modified acrylic polyol resin, a vinyl acetate monomer, and a polyester-modified urethane resin having an aliphatic polyhydric alcohol having a hydroxyl group; As an additive, any one selected from TiO ₂ , ZnO, CdS, and WO ₃ photocatalyst materials may be added and used.

Here, the additive may be added with a polyalkyl silicate having a structure in which the main chain and the side chain are substituted with an alkyl group, a methyl group or an ethyl group and has a degree of polymerization in the range of 3 to 10.

Here, in the middle stage, a first step of removing dust and impurities by using a feed hopper with respect to the maintenance painting part; A second step of preheating the inside of the booth to a temperature of 35 to 40 캜 through the preheating part; A third step of applying a primer spacer so as to enhance adhesion between the upper and lower surfaces and to provide a buffering function, a filling function, and a rust preventing function to the surface to be repaired; A fourth step of drying and curing the primer spacer at 55 to 65 ° C for 20 to 30 minutes through the drying unit or naturally drying at room temperature for 40 to 50 minutes in the booth; A fifth step of easily grasping the height of the surface of the repair coating part and applying a guide coat so as to easily confirm the polishing operation; A sixth step of polishing the primer surface of the primer so as to remove the uneven portions and to improve adhesion to the top surface and durability; And a seventh step of removing dust and oil by performing a degreasing treatment on the polishing area.

Herein, the primer spacer may be an alkyd resin, an aminoalkyd resin, a urethane alkyd resin, an acrylic alkyd resin, a urethane containing a fatty acid, or a mixture of a polyester resin and a melamine formaldehyde resin modified with semi-dry or non- A modified water-dispersible alkyd polyol resin, and a modified water-dispersed alkyd polyol resin; 10 to 20 parts by weight of an epoxy resin may be mixed with 100 parts by weight of the water-soluble resin.

Here, in the above-described sub-step, a foreign matter and oil are removed through the degreasing process on the side of the surface to be repaired, thereby preventing the coating film from being defective due to the occurrence of the cretaring phenomenon. By using the abrasive paper P80 to grasp the car body surface on the side of the above-mentioned repainting paint part, it is polished while maintaining an angle of 15 to 20 degrees with the car body surface to remove the old film, thereby improving the adhesion of the putty A second step of preprocessing; A third step of removing dust generated when the precursor film is removed by the pretreatment; A preheating step of heating the inside of the booth to a temperature of 35 to 40 ° C through the preheating part; A fifth step of applying the repainting portion side putty so that air does not come into contact with the body surface from which the structured film has been removed; Drying the putty at 55 to 65 ° C for 20 to 25 minutes through the drying unit or naturally drying at room temperature for 30 to 40 minutes in the booth; A seventh step of easily grasping the height of the work surface with respect to the maintenance painting part and then applying the guide coat so as to easily confirm the putty polishing operation; An eighth step of grinding the putty applying part in a state in which the abrasive paper P80 is in close contact with the surface of the putty applying part, And a ninth step of removing dust and oil by performing a degreasing process after the polishing.

Herein, the putty comprises 100 parts by weight of an unsaturated polyester resin containing 50 to 60% by weight of a solid content of maleic anhydride and anhydride of phthalic anhydride and propylene glycol. To improve the abrasiveness, titanium dioxide or silicon dioxide 5 to 15 A water-soluble paint added with parts by weight can be used.

According to the present invention, it is possible to perform an environmentally friendly coating treatment by performing a repair coating using a water-soluble paint, minimize the peeling and falling phenomenon of the coating film, and improve the quality of coating, A useful effect can be achieved.

The present invention can prevent the occurrence of color dichroism due to the change of color after application and drying of the base coat, which is a color paint, by adjusting the humidity in the booth according to the use of the water-soluble paint, A useful effect that can be achieved.

1 is a schematic process diagram showing a repair painting method of a vehicle according to an embodiment of the present invention.
FIG. 2 is a schematic block diagram illustrating a painting equipment used to perform a method of repairing a vehicle according to an embodiment of the present invention. Referring to FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

As shown in FIG. 1, the repair painting method of the vehicle according to the embodiment of the present invention includes a sub-step S100, a middle step S200, and a top-up step S300.

As shown in FIG. 2, the sub-steps S100 to S300 include a booth 10 having a closed space for painting the vehicle, An air supply unit 20 having a dust removing filter for removing dust contained in the supplied air, an impurity removing filter unit 30 for removing dust and impurities in the air introduced into the booth 10, A preheating unit 40 for heating the inside of the booth 10 to maintain a predetermined temperature, a drying unit 50 for use in drying a coating film formed after coating the vehicle, A floor dust removing unit 60 for removing dust falling to the floor when painting using a spray gun in the booth 10, a coating dust odor removing unit 60 for removing dust and odors generated during painting using the spray gun in the booth 10, [0050] Utilizing the vehicle painting equipment comprising it is possible to perform maintenance of the vehicle body paint.

At this time, the booth 10 can be made of a urethane panel having a urethane foam heat insulating material excellent in heat insulation performance and durability so as to improve the quality of a coating film by minimizing internal temperature maintenance and heat loss.

The preheating unit 40 may include a hot air supply unit for supplying hot air or an electric heater for supplying heat energy. The drying unit 50 may be a far-infrared ray Dryer or a microwave dryer, but it is preferably provided as a portable type.

Preferably, the spray gun is configured to be connected to an air transformer having a filter for maintaining a constant air pressure and removing oil and moisture in the compressed air.

The spray gun can be used separately for each of the priming step S100, the middle step S200, and the topping step S300.

The lowering step S100 is a step of rust-proofing and surface-fitting the repair-painted portion of the vehicle body.

More specifically, the lowering step S100 removes foreign matter and oil from the side of the vehicle body to be repaired, thereby preventing the coating film from being defective due to the occurrence of the crating phenomenon (S111).

It is possible to improve the adhesion of the putty during the putty work by removing the old film by grinding while maintaining the body side of the body at the angle of 15 to 20 degrees with the body side using the abrasive paper P80, (S112).

The dust generated when the precursor film is removed by the pretreatment is removed (S113).

In this case, all parts of the dust generated in the booth are removed, so that it is possible to prevent the occurrence of coating defects due to dust during the subsequent coating operation.

The inside of the booth is preliminarily heated to a temperature of 35 to 40 DEG C through the preheating unit (S114).

A putty is applied on the side of the vehicle body to be repaired so as to prevent the body surface from being contacted with air (S115).

At this time, the putty contains 50 to 60% by weight of solid content, and 100 parts by weight of an unsaturated polyester resin having axial reaction of maleic anhydride with phthalic anhydride and propylene glycol is added to titanium dioxide or silicon dioxide 15 parts by weight of a water-soluble paint.

The putty applied at 55 to 65 ° C for 20 to 25 minutes is dried using the non-contact electromagnetic wave through the drying unit, such as a far-infrared ray drier or a microwave dryer, or naturally dried at room temperature for 30 to 40 minutes in the booth (S116 ).

The guide coat is applied (S117) so as to easily confirm the height of the work surface with respect to the maintenance-painted portion of the vehicle body, and then to confirm easily with the putty polishing operation.

The polishing pad P80 is brought into close contact with the putty applying portion, and the polishing is performed so that the body surface is not seen from the interface (S118).

After polishing the putty-applied portion, dust and oil on the side of the repair-coated portion are removed through degreasing (S119).

The middle stage (S200) is a step for protecting the processed portion by the lowering step (S100) and increasing the efficiency for top coating.

More specifically, in the middle stage (S200), dust and impurities are removed by using a piston ring for the repair-painted portion of the vehicle body that has undergone the descaling step (S100) (S211).

At this time, it is preferable to use a waterproof godpipe using a non-solvent pressure-sensitive adhesive excellent in the ability to collect dust and impurities with a fine mesh net nonwoven fabric.

The interior of the booth is preliminarily heated to a temperature of 35 to 40 DEG C through the preheating unit (S212).

In step S213, the primer coating is applied to the repair-coated part of the vehicle body so as to enhance the adhesion between the upper and lower surfaces and to provide a buffering function, a filling function, and a rust preventive function.

At this time, the primer spacer is an intermediate coating material, which is an alkyd resin, an aminoalkyd resin, an urethane alkyd resin, an acrylic alkyd resin, a fatty acid mixed with a polyester resin and a melamine formaldehyde resin modified with semi-dry or non- Soluble urethane-modified water-dispersed water-dispersible alkyd polyol resin, and an urethane-modified water-dispersed water-dispersible alkyd polyol resin.

Here, 10 to 20 parts by weight of an epoxy resin is preferably mixed with 100 parts by weight of the water-soluble resin.

The primer applied at 55 to 65 ° C for 20 to 30 minutes is dried using a non-contact electromagnetic wave through the drying unit, such as a far-infrared ray drier or a microwave dryer, or naturally dried at room temperature for 40 to 50 minutes in a booth S214).

The guide coat is applied (S215) so as to easily confirm the height of the surface of the vehicle body with respect to the repair coating portion and to easily confirm subsequent polishing operations.

The primer surface side is polished so as to remove the uneven portions and to improve adhesion and durability to the top surface (S216).

At this time, a sander with a middle sponge pad is used to polish the primer with a polishing pad P600 to prevent peeling of the primer spacer.

The dust and oil are removed by performing a degreasing process on the car body repair painting part including the polishing part (S217).

In the step S300, the basecoat and the clearcoat are sequentially applied to the repair-painted portion of the vehicle after the intermediate step S200, and the color is reproduced and then the gloss is applied.

More specifically, in the step S300, the maintenance-painted portion of the vehicle body is degreased to remove dust and oil, thereby preventing a coating film failure (S311).

The fine dust and foreign matter are removed from the maintenance-painted portion of the vehicle body by using a piston rod (S312).

At this time, it is preferable to use a waterproof godpipe using a non-solvent pressure-sensitive adhesive excellent in the ability to collect dust and impurities with a fine mesh net nonwoven fabric.

The inside of the booth is preliminarily heated to a temperature of 35 to 40 ° C. through the preheating unit and the relative humidity in the booth is adjusted to 40 to 70% (S 313).

At this time, when the relative humidity in the booth is less than 40%, it becomes too dry, so that the adhesion of the base coat used for coloring the vehicle body may be decreased, and the coating film may be cracked and torn, If the humidity is higher than 70%, when the base coat is applied, the adhesion may be deteriorated due to the increase of moisture, and the durability of the coating film may be lowered easily, and the phenomenon of falling easily may occur. Depending on the humidity conditions formed in the booth, A change in the back color is caused, which makes it difficult to realize the same color and deteriorates the quality of the coating film.

A base coat for realizing the color of the vehicle body is applied (S314) to the maintenance-painted portion of the vehicle body, in order to conceal the maintenance-painted portion.

At this time, the base coat uses a water-soluble paint containing 5 to 80 parts by weight of pigment, 10 to 120 parts by weight of additives, and 450 to 500 parts by weight of distilled water of ultra pure water per 100 parts by weight of water-soluble resin.

The water-soluble resin is an alkyd resin mixed with a melamine formaldehyde resin and modified with a semi-dry or a non-dry oil-repellent to enhance color retention and ductility while having low temperature hardening, high corrosion resistance and durability, an aminoalkyd resin , A urethane-modified alkyd resin, an acrylic alkyd resin, a urethane-modified water-dispersed alkyd polyol resin containing a fatty acid, and a dimethylol propionic acid having a carboxyl group and a hydroxyl group.

At this time, the water-soluble resin can exhibit the function of weather resistance and adhesion.

The pigment may have an inorganic pigment, an organic pigment, or a combination thereof.

The additive is selected from the group consisting of polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether having a polyoxyethylene chain, hydroxyl group And a nonionic surfactant of a polyglycerol ester having a carboxyl group.

The additive may be added with a polyalkyl silicate having a structure in which the main chain and the side chain are substituted with an alkyl group, a methyl group or an ethyl group to have a stain resistance and a self-cleaning action, and having a degree of polymerization in the range of 3 to 10.

The ultrapure distilled water is distilled water in which industrial water is passed through an ion exchange resin column to remove cations and anions, and it is possible to prevent the occurrence of blistering in the film due to ions in the water molecule.

Here, the base coat is applied three times, the overlap width is 1/2 in one application, 2/3 in two applications, and 3/4 in three applications. .

Here, the base coat can be processed in the form of two times of coating, followed by degreasing using a ginning cloth and then finishing for the third time.

The base coat is dried and cured at 55 to 65 ° C for 20 to 30 minutes through the drying unit (S315).

At this time, after the drying and curing treatment of the base coat, a work of cooling to a constant temperature (for example, 15 to 20 ° C) is performed.

The inside of the booth is preliminarily heated to a temperature of 35 to 40 DEG C through the preheating unit (S316).

A clearcoat is applied to the top surface of the base coat coating film to improve gloss and appearance and durability (S317).

The clearcoat is a water-soluble transparent coating material, which comprises an active material having a solid content of 40 to 70 wt%, a weight average molecular weight of 8000 to 10000 Mw, and a glass transition temperature of 10 to 30 DEG C, wherein the main material is an acrylic monomer having a carboxylic acid, At least one selected from an acrylic monomer having a hydroxyl group, a silane modified acrylic polyol resin, a vinyl acetate monomer, and a polyester-modified urethane resin having an aliphatic polyhydric alcohol having a hydroxyl group.

Further, by adding any one selected from the photocatalyst materials of TiO ₂ , ZnO, CdS, and WO ₃ as an additive, it is possible to provide an anti-staining property and a self-cleaning action, thereby improving luster and transparency.

The clear coat applied at 55 to 65 ° C for 30 to 40 minutes is dried and cured through the drying unit (S318).

At this time, after the drying and curing treatment of the clear coat, an operation of cooling to a constant temperature (for example, 15 to 20 ° C) is performed.

Accordingly, in the present invention, it is possible to provide an advantage of enhancing the paint quality while carrying out eco-painting by water-soluble paint through the undercoating, middle and topcoating steps described above.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. May be made, which will be within the technical scope of the present invention.

S100:
S200:
S300: Phase step
S311: degreasing step
S312: foreign matter removal step
S313: preheating step
S314: Basecoat application step
S315: drying step
S316: preheating step
S317: Clearcoat application step
S318: drying step

Claims (8)

delete An air supply unit having a booth having an airtight space for painting the vehicle and a dust removing filter for removing dust contained in the air supplied and supplied with fresh air into the booth; A drying unit for use in drying a coating film formed after the painting process of the vehicle, a drying unit for drying the inside of the booth, a drying unit for drying the inside of the booth, A floor dust removing unit for removing dust falling to the floor during coating using a spray gun, and a painting dust odor removing unit for removing dust and odors generated during painting using the spray gun in the booth A method of repairing a vehicle, comprising the steps of:
(A) a step of performing rust prevention and surface fitting on the repair-painted portion of the vehicle body;
(B) a middle stage which protects the treated portion by the sub-step and increases the efficiency for top painting;
(C) a topping step of successively applying a base coat and a clear coat to a repair painting portion of the vehicle after the intermediate stage to give a shine after reproducing colors; / RTI >
In the above step,
A first step of removing the dust and oil from the coating film so as to prevent a coating film failure; A second step of removing fine dust and foreign matter from the repair coating part using a feeder cloth; A third step of preheating the inside of the booth to a temperature of 35 to 40 ° C through the preheating part and adjusting the relative humidity in the booth to 40 to 70%; A fourth step of applying a basecoat for realizing the color of the vehicle body and concealment of the repair painting part with the repair painting part; A fifth step of drying and curing the base coat applied at 55 to 65 ° C for 20 to 30 minutes through the drying unit; A preheating step of heating the inside of the booth to a temperature of 35 to 40 ° C through the preheating part; A seventh step of applying a clearcoat to the upper surface of the base coat coating film to improve gloss and appearance and durability; Drying and curing the clearcoat applied at 55 to 65 ° C for 30 to 40 minutes through the drying unit; Lt; / RTI >
Wherein the base coat is a water-soluble paint comprising 5 to 80 parts by weight of pigment, 10 to 120 parts by weight of an additive, and 450 to 500 parts by weight of distilled water of ultra pure water per 100 parts by weight of a water-soluble resin;
The booth is made of a urethane panel having excellent heat insulation performance and durability in order to maintain the internal temperature and minimize heat loss, and the drying unit is composed of a movable far-infrared ray drier or a microwave dryer, and the spray gun is used by connecting an air transformer ;
Wherein the water-soluble resin for the base coat is selected from the group consisting of an alkyd resin, an aminoalkyd resin, a urethane-alkyd resin, an acrylic alkyd resin and a fatty acid mixed with a polyester resin and a melamine formaldehyde resin modified with semi-dry or non- A urethane-modified water-dispersed alkyd polyol resin, and a dimethylol propionic acid having a carboxyl group and a hydroxyl group are used;
Wherein the additive is selected from the group consisting of polyoxyethylene alkyl ether having polyoxyethylene chain, polyoxyethylene alkylphenyl ether, polyoxyethylene polyoxypropylene alkyl ether and nonionic surfactant having polyglycerol ester having hydroxyl group;
Wherein the ultrapure distilled water is distilled water in which industrial water is passed through an ion exchange resin column to remove positive ions and negative ions and is configured so as to prevent the occurrence of blistering in the film due to ions in the water molecule. 3. The method of claim 2,
In the clear coat,
An acrylic monomer having a carboxylic acid, an acrylic monomer having a hydroxyl group, a silane-modified acrylic polyol resin having a hydroxyl group, and a silane-modified acrylic polyol resin having a weight average molecular weight of 8000 to 10000 Mw and a glass transition temperature of 10 to 30 ° C. , A vinyl acetate monomer, and a polyester-modified urethane resin having an aliphatic polyhydric alcohol having a hydroxyl group;
And a photocatalyst material selected from the group consisting of TiO ₂ , ZnO, CdS and WO ₃ is added as an additive. The method of claim 3,
Wherein the additive is a polyalkyl silicate having a structure in which the main chain and the side chain are substituted with an alkyl group or a methyl group or an ethyl group and has a degree of polymerization in the range of 3 to 10. 3. The method of claim 2,
In the middle stage,
A first step of removing dust and impurities from the repair-coated portion using a gypsum board;
A second step of preheating the inside of the booth to a temperature of 35 to 40 캜 through the preheating part;
A third step of applying a primer spacer so as to enhance adhesion between the upper and lower surfaces and to provide a buffering function, a filling function, and a rust preventing function to the surface to be repaired;
A fourth step of drying and curing the primer spacer at 55 to 65 ° C for 20 to 30 minutes through the drying unit or naturally drying at room temperature for 40 to 50 minutes in the booth;
A fifth step of easily grasping the height of the surface of the repair coating part and applying a guide coat so as to easily confirm the polishing operation;
A sixth step of polishing the primer surface of the primer so as to remove the uneven portions and to improve adhesion to the top surface and durability;
A seventh step of removing dust and oil by performing a degreasing treatment on the abrasive part; Wherein the repairing step includes the steps of: 6. The method of claim 5,
The primer-
Modified urethane-modified water-dispersed alkyd polyol resin containing an alkyd resin, an aminoalkyd resin, an urethane alkyd resin, an acrylic alkyd resin, and a fatty acid mixed with a polyester resin modified with a semi-dry or non-dry type preservative resin and a melamine formaldehyde resin A water-soluble paint obtained by mixing an epoxy resin to improve adhesion to any one water-soluble resin;
Wherein 10 to 20 parts by weight of an epoxy resin is mixed with 100 parts by weight of the water-soluble resin. 3. The method of claim 2,
In the lower stage,
A first step of removing a foreign matter and an oil through the degreasing on the side of the repair painting part to prevent a coating film defect due to occurrence of a crete phenomenon;
By using the abrasive paper P80 to grasp the car body surface on the side of the above-mentioned repainting paint part, it is polished while maintaining an angle of 15 to 20 degrees with the car body surface to remove the old film, thereby improving the adhesion of the putty A second step of preprocessing;
A third step of removing dust generated when the precursor film is removed by the pretreatment;
A preheating step of heating the inside of the booth to a temperature of 35 to 40 ° C through the preheating part;
A fifth step of applying the repainting portion side putty so that air does not come into contact with the body surface from which the structured film has been removed;
Drying the putty at 55 to 65 ° C for 20 to 25 minutes through the drying unit or naturally drying at room temperature for 30 to 40 minutes in the booth;
A seventh step of easily grasping the height of the work surface with respect to the maintenance painting part and then applying the guide coat so as to easily confirm the putty polishing operation;
An eighth step of grinding the putty applying part in a state in which the abrasive paper P80 is adhered to the putty applying part from the interface toward the inside,
A ninth step of removing dust and oil through the degreasing process after the polishing; Wherein the repairing step includes the steps of: 8. The method of claim 7,
The putty may be,
100 parts by weight of an unsaturated polyester resin containing 50 to 60% by weight of a solid content and KOH (ml / g) having an acid as a solid content of 18 to 23 and having undergone axial reaction of maleic anhydride with phthalic anhydride and propylene glycol, Titanium dioxide or silicon dioxide in an amount of 5 to 15 parts by weight per 100 parts by weight of the water-soluble paint.

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