KR20190007189A - Multi primier-surfacer paint composition for reparing automobiles and method of repairing automobile using the same - Google Patents

Abstract

The present invention relates to a multi primer-surfacer paint composition for automotive repair. In particular, the paint composition exhibits characteristics of a non-sanding primer-surfacer paint or a sanding-type primer-surfacer paint, depending on the mixing ratio of a main component, a curing agent component, and a diluent solvent. The main component of the paint composition comprises: (1) 10-30 wt% of styrene, 10-30 wt% of butyl acrylate, 10-30 wt% of hydroxyethyl methacrylate, and 30-40 wt% of an acrylic polyol resin having a solid content in the range of 40-60 wt% with respect to the total weight thereof; (2) 5-15 wt% of talc having an average particle size in the range of 2-9 μm; (3) 5-15 wt% of barium sulfate; (4) 15-30 wt% of anatase or rutile type titanium dioxide; (5) 0.01-1 wt% of an urethane reaction accelerator; and (6) 10-30 wt% of an organic solvent. The curing agent component includes an isocyanate compound.

Description

TECHNICAL FIELD [0001] The present invention relates to a multi-primer-spacer coating composition for automobile repair, and an automobile repair method using the same. BACKGROUND ART [0002]

The present invention relates to a multi-nong sanding primer-spacer coating composition for automobile repair and an automobile repairing method using the same. More particularly, the present invention relates to a multi- And a method for repairing an automobile using the coating composition.

Due to the large size of automobile maintenance companies and the integration and unification of small companies, efforts are being made to shorten the working time and reduce the heat treatment cost in order to have competitiveness in the automobile repair painting industry. Therefore, the economical efficiency of paints and work in car repair painting system is absolutely important.

Particularly in the high oil price era, each industry has made efforts to save energy and in the field of automobile repair paint, the paint which can finish the work quickly while consuming less energy is the most demanded.

Automobile repair is a process that restores a wide range of damaged areas to their original shape, from small damage to local car damage to largely three panel damage repair. In recent years, with the gradual increase in the quality of automobiles, partial repair and small area repair types are increasing.

In order to repair the damaged part, it is divided into a surface adjustment step, a middle processing step and a top processing step.

The surface conditioning step includes a surface preparation step including the evaluation of the damaged area, the washing of the damaged area and the removal of foreign substances, the surface polishing and cleaning steps to fill the grooves or scratches of the damaged area and smooth the surface, , Putty polishing and cleaning steps, and the like.

The intermediate stage includes a masking step of a portion where coating is not required, a degreasing step of the intermediate coating portion, a primer-to-spacer intermediate coat application step to increase the corrosiveness and surface smoothness of the damaged portion, a middle coat paint drying step, a middle polishing and cleaning step .

The upper phase processing step includes a secondary masking step in which the upper coating is unnecessary, a color paint application step in which the colors are matched, a transparent paint application step in which gloss is imparted and durability is increased, and finally, a light for finishing the exterior surface And a step of betting and evaluation.

The conventional two-pack primer-spacer coating composition is required to fill the concave and convex portions of the base through spray coating and then smooth the surface through a polishing process. The polishing process is required to prevent the appearance of the top surface It is possible to achieve the required quality such as adhesion and water resistance. Accordingly, a two-pack non-sanding primer-spacer (registered patent No. 10-1435969) technique for automobile repair, which does not require a polishing process and a drying process separately, has been developed.

However, the above-described two-part non-sanding primer-spacer coating composition is mainly used in an exchange panel operation in which the concavo-convex portion is not relatively deep or is pretreated. When the concavo-convex portion is deeper or damaged, the conventional two-component sanding primer- It is difficult to apply the present invention in a case where it is necessary to use a new sanding primer.

Accordingly, an object of the present invention is to provide a multi-primer-spacer coating composition for automobile repair which can be applied as a sanding-type and non-sanding type primer-spacer coating by only changing the mixing ratio of the main portion, the hardener portion and the dilution- will be.

Another object of the present invention is to provide an automobile repairing method using the above multi-primer-spacer coating composition for automobile repair.

In order to achieve the object of the present invention, the multi-primer-spacer coating composition for automobile repair may be a coating composition having properties of a non-sanding type primer coating or a sanding type primer coating depending on the mixing ratio of the main part, the hardening part and the diluting solvent to be. (1) 10 to 30% by weight of styrene, 10 to 30% by weight of butyl acrylate and 10 to 30% by weight of hydroxyethyl methacrylate, wherein the solid content is 40 to 60% by weight of the total, 30 to 40 parts by weight of an acrylic polyol resin; (2) 5 to 15 wt% of talc having an average particle size in the range of 2 to 9 mu m; (3) 5-15 wt% barium sulfate; (4) 15 to 30% by weight of anatase or rutile type titanium dioxide; (5) 0.01 to 1% by weight of a urethane reaction promoter; And (6) 10 to 30% by weight of an organic solvent. The curing agent portion includes an isocyanate compound.

In one embodiment, the acrylic polyol resin may have a solids content of 40 to 60 wt% in its total content and a butyl acetate content of 40 to 60 wt% in a non-solid content.

In one embodiment, the acrylic polyol resin has an acid value of 5 to 30 mgKOH / g, a hydroxyl value of 2 to 7% by weight, a glass transition temperature of 40 to 60 ° C, a nonvolatile content of 40 to 60% Z is in the range of Z to Z3, the number average molecular weight is in the range of 2,000 to 10,000, and the molecular weight distribution is 3 or less.

In one embodiment, the barium sulfate may have an average particle size in the range of 2 to 9 mu m.

In one embodiment, when the automotive repair multi-primer-spacer coating composition is used as a sanding-type primer coating composition, a dilution solvent of 0.8 to 1.2 times the volume of the curing agent portion and 3.8 to 4.2 times the volume of the curing agent portion It is preferable to use a mixture. That is, the hardener, the main part, and the diluting solvent may be mixed in a volume ratio of 1: 3.8 to 4.2: 0.8 to 1.2.

In one embodiment, when the automotive repair multi-primer-to-spacer coating composition is used as a non-sanding primer spacer coating, the amount of the main component of 3.8 to 4.2 times the volume of the curing agent and 1.8 to 2.2 times the volume of the curing agent Is preferably used in combination. That is, the curing agent, the main part, and the diluting solvent may be mixed in a volume ratio of 1: 3.8 to 4.2: 1.8 to 2.2.

Another object of the present invention is to provide a method of manufacturing a primer-spacer film by coating a multi-primer-spacer coating composition for automobile repair, which is formed by mixing a main part, a hardener and a diluting solvent, And applying the top coat composition onto the primer-surfacer film.

In one embodiment, when the automotive repair multi-primer-spacer coating composition is used as a sanding-type primer coating composition, a dilution solvent of 0.8 to 1.2 times the volume of the curing agent portion and 3.8 to 4.2 times the volume of the curing agent portion It is preferable to use a mixture.

In one embodiment, when the automotive repair multi-primer-to-spacer coating composition is used as a non-sanding primer spacer coating, the amount of the main component of 3.8 to 4.2 times the volume of the curing agent and 1.8 to 2.2 times the volume of the curing agent Is preferably used in combination.

If such a coating composition is used, it is possible to use it as a non-sanding and sanding type mix by only changing the mixing ratio of the main portion, the hardener portion and the diluting solvent. Therefore, it is advantageous to work with one product depending on the degree of damage of the uneven portion, There are advantages in item reduction and inventory management.

Hereinafter, the multi-primer-spacer coating composition for automobile repair of the present invention will be described in more detail. While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are further described in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In this application, the terms "comprises" or "having", etc. are intended to specify the presence of stated features, components, steps, processes, compositions, or combinations thereof in the specification, and not to limit the presence or addition of one or more other features or components, Steps, processes, compositions, or combinations thereof, which are not intended to be limiting.

Also, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Multi-Primer for Automotive Repair - Surfacing Paint Composition

The multi-primer-spacer coating composition for automobile repair according to an embodiment of the present invention may be applied to automotive repair multi-primer coatings having properties of a non-sanding type primer coating or a sanding type primer coating depending on the mixing ratio of the main portion, - a surface coating composition.

The subject part of the automotive repair multi primer-spacer coating composition comprises (1) 10 to 30% by weight of styrene, 10 to 30% by weight of butyl acrylate and 10 to 30% by weight of hydroxyethyl methacrylate, 30 to 40 parts by weight of an acrylic polyol resin which is 40 to 60% by weight of the whole; (2) 5 to 15 wt% of talc having an average particle size in the range of 2 to 9 mu m; (3) 5-15 wt% barium sulfate; (4) 15 to 30% by weight of anatase or rutile type titanium dioxide; (5) 0.01 to 1% by weight of a urethane reaction promoter; And (6) 10 to 30% by weight of an organic solvent.

The acrylic polyol resin contained in the coating composition of the present invention comprises 10 to 30% by weight of styrene, 10 to 30% by weight of butyl acrylate and 10 to 30% by weight of hydroxyethyl methacrylate.

Wherein the acrylic polyol resin has a butyl acetate content of 40 to 60 wt%, an acid value of 5 to 30 mgKOH / g, a hydroxyl value of 2 to 7 wt%, a glass transition temperature of 40 to 60 캜 and a Gardner viscosity of Z to Z3 Having a number average molecular weight of 2,000 to 10,000 and a molecular weight distribution of 3 or less.

Such an acrylic polyol resin is suitable for application to a two-pack type primer-spacer since it has a high curing drying speed, does not inhibit abrasion, and has excellent physical properties.

If the content of hydroxyl groups in the acrylic polyol resin is less than 2% by weight, the physical properties of the paint may be poor. If the content of hydroxyl groups exceeds 7% by weight, the effect of shortening the working time may be reduced due to an increase in drying time. Weight%. More preferably 1 to 3% by weight.

When the glass transition temperature of the acrylic polyol resin is 40 캜 or lower, the abrasiveness of the coating film is poor. When the glass transition temperature exceeds 60 캜, the mechanical properties such as impact resistance, flexural resistance, and adhesion deteriorate. Therefore, it is preferable to set the glass transition temperature to be in the range of 40 to 60 占 폚.

The acrylic polyol resin is preferably used in a solid content of 40 to 60 wt%, and when the solid content satisfies the above condition, it is used in an amount of 30 to 40 wt% based on the total amount of the composition. If the amount is less than 30% by weight, physical properties of the coating film may be deteriorated. If the amount of the coating is more than 40% by weight, the abrasiveness of the coating film is greatly deteriorated. Accordingly, the acrylic polyol resin is preferably used in the range of 30 to 40% by weight.

The talc component used in the coating composition of the present invention is added for the purpose of improving the filling function of the primer-spacer and improving the adhesion of the applied top coat and improving the particle size, so that the average particle size is in the range of 2 to 9 μm do. If the average particle size is less than 2 mu m, the oil absorption becomes too high and the dispersibility decreases due to the increase of the dispersion viscosity. If the average particle size is more than 9 mu m, the particle size falls and the appearance may be deteriorated. The talc is used in the range of 5 to 15% by weight based on the total amount of the composition. If the amount is less than 5% by weight, the adhesion may deteriorate and the filling function may be deteriorated. If the amount is more than 15% by weight, the dispersion may be deteriorated due to high viscosity.

The coating composition of the present invention also includes barium sulfate. It is used for improving the filling function and the particle size, and has an average particle size in the range of 2 to 9 mu m. When the average particle size is within the above range, the oil absorption is low, which is easy to apply and helps to improve the particle size. The amount of barium sulfate to be used is in the range of 5 to 15% by weight based on the total amount of the composition. If the amount is less than 5% by weight, the effect of improving the filling function and the particle size is insignificant. If the amount is more than 15% by weight, adhesion and physical properties may be deteriorated.

The coating composition of the present invention includes anatase or rutile type titanium dioxide. This is a component used for the purpose of assisting the cover of the undergarment or substrate and realizing the color of the primer-spacer. The amount of titanium dioxide to be used is in the range of 15 to 30% by weight based on the total amount of the composition. If the amount is less than 15 wt%, the hiding power is insufficient and it is difficult to exert its function as a primer-surface spacer. If the amount of use exceeds 30 wt%, hiding power is improved but other properties may be deteriorated.

The coating composition of the present invention also comprises a urethane reaction promoter. Specific examples thereof include metal compounds such as dibutyl tin dilaurate, stannous octate, dibutyl tin diacetate and dibutyl tin dimer titride, and metal compounds such as triethyl diamine, triethyl ethanol amine, 1,4-diazo cyclooctane, 2- Tertiary amines such as aminoethyl, trimethylaminoethylethanolamine, pentamethyldiethylenetriamine, dimethylethanolamine, ethylmorphyrin, dimethylaminoethylmorpholine, dimethylcyclohexylamine, and carboxylic acid salts of alkali metals, zinc complex compounds and the like Varies. These may be used alone or in combination of two or more.

The amount of the urethane reaction promoter to be used is in the range of 0.01 to 1% by weight based on the total amount of the composition. If the amount is less than 0.01% by weight, it is difficult to exhibit the function as a catalyst. If the amount is more than 1% by weight, the use time of the coating becomes short, which is not preferable.

The organic solvent used in the composition of the present invention can impart suitable boiling point and rheological properties to the coating composition.

Specific examples include xylene, butyl acetate, ethyl acetate, 1-methoxy 2-propyl acetate, isobutyl methyl ketone, solvent naphtha, 1-methoxy-2-acetoxypropane, propylene glycol methyl ether propionate, And the amount thereof is from 10 to 30% by weight based on the total amount of the composition. These solvents may be used alone or in combination of two or more.

The curing agent part to be applied to the automotive repair multi-primer-to-spacer coating composition may include an isocyanate compound and an isocyanate compound dissolved in an organic solvent.

The diluting solvent to be applied to the automotive repair multi-primer-to-spacer coating composition is a component that causes the multi-primer-to-spacer coating composition to have the characteristics of the sanding-type primer-spacer coating or the non-sanding-type primer-

In one embodiment, when the automotive repair multi-primer-spacer coating composition is used as a sanding-type primer coating composition, a dilution solvent of 0.8 to 1.2 times the volume of the curing agent portion and 3.8 to 4.2 times the volume of the curing agent portion Mixed. That is, it is preferable to mix the hardener, the main part and the diluting solvent in a volume ratio of 1: 3.8 to 4.2: 0.8 to 1.2.

If the mixing ratio of the main portion to the curing agent is less than 3.8 times or more than 4.2 times, the physical properties of the paint may be weakened and the drying time may be prolonged due to the decrease of the dryness.

Also, when the blending ratio of the sizing agent to the hardening agent in the coating composition of the sanding-type characteristic is 0.8 times or less, the viscosity may become high and the spraying workability may become weak. When the mixing ratio exceeds 1.2 times, the viscosity is low, It can not be formed.

In another embodiment, when the automotive repair multi-primer-spacer coating composition is used as a non-sanding type primer spacer coating, a dilution of from 1.8 to 2.2 times the volume of the curing agent volume, A solvent may be used in combination. That is, it is preferable to mix the hardener, the main part and the diluting solvent in a volume ratio of 1: 3.8 to 4.2: 1.8 to 2.2.

If the mixing ratio of the diluting solvent to the curing agent in the coating composition of the non-sanding type is 1.8 times or less, the drying and leveling may be lowered. If the mixing ratio is over 2.2 times, the coating may be diluted and the hiding power may be lowered.

A method for repairing an automobile using a multi-primer-spacer coating composition for automobile repair, which is formed by mixing the main portion, the hardener, and a diluting solvent, is applied on a substrate for repair to prepare a primer-spacer film, And then applying the top coat composition.

A detailed description of the automotive repair multi-primer-spacer coating composition has been described in detail above, and is omitted in order to avoid duplication.

Hereinafter, the present invention will be described in more detail with reference to specific examples. The present invention can be modified in various ways other than the following embodiments, and the scope of the present invention is not limited thereto.

Example 1

10 wt% of barium sulfate (Korea Semiconductor), 36 wt% of acrylic polyol resin, 6 wt% of butyl acetate, 6 wt% of 1-methoxy 2-propyl acetate, 3 wt% of ethyl acetate, 5 wt% of solvent naphtha, 10 parts by weight of talc (manufactured by Youngwoo Resources), 23 parts by weight of titanium dioxide (manufactured by Cosmo Chemical Co., Ltd.) and 0.5% by weight of dibutyltin dilaurate as a urethane reaction accelerator were mixed to prepare a main part A.

25 parts by weight of hexamethylene diisocyanate trimer, and 75 parts by weight of xylene were mixed to prepare a curing agent part B.

Comparative Example 1

By weight of acrylic acid, 43.5% by weight of acrylic polyol resin, 6% by weight of butyl acetate, 6% by weight of 1-methoxy 2-propyl acetate, 3% by weight of ethyl acetate, 5% by weight of solvent naphtha, 8 parts by weight of talc (manufactured by Youngwoo Resources), 20 parts by weight of titanium dioxide (manufactured by Cosmo Chemical Co., Ltd.) and 0.5% by weight of dibutyltin dilaurate as a urethane reaction promoter were mixed to prepare a main part A.

25 parts by weight of hexamethylene diisocyanate trimer, and 75 parts by weight of xylene were mixed to prepare a curing agent part B.

Comparative Example 2

10 wt% of barium sulfate (Korea Semiconductor), 36 wt% of acrylic polyol resin, 6 wt% of butyl acetate, 6 wt% of 1-methoxy 2-propyl acetate, 3 wt% of ethyl acetate, 5 wt% of solvent naphtha, 10 parts by weight of talc having an average particle size of about 20 占 퐉, 23 parts by weight of titanium dioxide (manufactured by Cosmo Chemical Co., Ltd.) and 0.5 parts by weight of dibutyltin dilaurate as a urethane reaction accelerator were mixed to prepare a main part A.

25 parts by weight of a hexamethylene diisocyanate trimer, and 75 parts by weight of xylene were mixed to prepare a curing agent B.

The test specimens were prepared as follows to evaluate the physical properties of the coating film by using the coating composition prepared according to Example 1 and Comparative Examples 1 and 2 as a non-sanding and sanding type.

Evaluation example 1

The non-sanding type specimens surface-treated with zinc phosphate were degreased with a Haikyk-Cleaner DR-180 and coated with a primer-spacer coating composition prepared according to Examples and Comparative Examples to a thickness of about 20 to 40 μm. Approximately 15 minutes after the set time, the hue base coat metallic color was applied to a thickness of about 15 to 20 탆. After about 10 minutes, the Haikyukuri coat master clear LV was coated twice to a thickness of about 40 to 60 mu m. After the set time of 10 minutes, the sample was heat-treated at about 60 ° C for about 30 minutes and left at room temperature for 7 days. At this time, each of the main portion A and the hardener portion B disclosed in Example 1 and Comparative Examples 1 and 2 and the diluting solvent, cinna, were mixed at a volume ratio of 4/1/2. Relative humidity 60% RH, temperature 25 占 폚 for 13 to 15 seconds with a Ford Cup # 4 viscometer.

Evaluation example 2

For the sanding type, the specimens surface-treated with zinc phosphate were degreased with a Haikyk-Cleaner DR-180, and the primer-sensor coating composition prepared according to Examples and Comparative Examples was coated to a thickness of about 60 to 80 μm. After a set time of about 10 minutes, it was heat-treated at about 60 DEG C for about 20 minutes. The primer-surfacer was polished to 400 necks, and then the hue base coat metallic color was applied to a thickness of about 15 to 20 μm. After about 10 minutes, the Haikyukuri coat master clear LV was coated twice to a thickness of about 40 to 60 mu m. After the set time of 10 minutes, the sample was heat-treated at about 60 ° C for about 30 minutes and left at room temperature for 7 days. At this time, each of the main portion A and the curing agent portion B disclosed in Example 1 and Comparative Examples 1 and 2 and the diluting solvent, cinna, were mixed at a volume ratio of 4/1/1. Relative humidity 60% RH, temperature 25 占 폚 for 18-20 seconds with a Ford Cup # 4 viscometer.

The physical properties of the cured coating film samples were measured as follows. The results are shown in Tables 1 and 2.

1) Subject: Appearance: After the specimen was formed, visual gloss and leveling were confirmed.

2) Surface spreadability: The operator confirmed the surface spreadability of the coating after spraying.

3) Adhesiveness: A cross-cut of 2 mm was adhered with a Scotch tape, and then peeled off and measured.

4) Impact resistance: The weight of the coating was measured by dropping a weight of 500 grams.

5) Flexural resistance: Measured by a flexural tester of 3/16 "diameter.

6) Concealability: The number of paintings for 100% concealment of the surface was measured.

7) Polishing property: The amount of the coated film peeled off during polishing for 30 seconds was confirmed by the operator.

<Table 1> Non sanding type

<Table 2> Sanding Type

The coating compositions prepared according to Example 1 and Comparative Examples 1 and 2 were each produced and evaluated by a non-sanding and sanding process. As a result, the coated film prepared by the composition according to Example 1 was applied as a non-sanding and sanding type The results showed good results in all properties such as appearance, adhesion, and abrasion.

However, when the amount of the resin is excessively used as in Comparative Example 1, the hardness of the coating film is increased, which results in poor polishing performance when used as a sanding type. Also, as in Comparative Example 2, when a large talc having an average particle size outside the range of 4 to 10 is used, it can be confirmed that the appearance of the object is greatly reduced.

In order to further examine the physical properties of the coating composition according to the embodiment of the present invention, the following Example 2 and Comparative Examples 3 and 4 were further carried out.

Example 2

By weight of an acrylic polyol resin, 36.5% by weight of butyl acetate, 6% by weight of 1-methoxy 2-propyl acetate, 3% by weight of ethyl acetate, 5% by weight of solvent naphtha, 15% 10 parts by weight of talc (manufactured by Youngwoo Resources), 18% by weight of titanium dioxide (manufactured by Cosmo Chemical Co., Ltd.) and 0.5% by weight of dibutyltin dilaurate as a urethane reaction promoter were mixed to prepare a main part A.

25 parts by weight of hexamethylene diisocyanate trimer, and 75 parts by weight of xylene were mixed to prepare a curing agent part B.

Comparative Example 3

By weight of an acrylic polyol resin, 36.5% by weight of butyl acetate, 6% by weight of 1-methoxy 2-propyl acetate, 3% by weight of ethyl acetate, 5% by weight of solvent naphtha, 15% 15 parts by weight of talc (manufactured by Youngwoo Resources), 13 parts by weight of titanium dioxide (manufactured by Cosmo Chemical Co., Ltd.) and 0.5% by weight of dibutyltin dilaurate as a urethane reaction promoter were mixed to prepare a main part A.

25 parts by weight of hexamethylene diisocyanate trimer, and 75 parts by weight of xylene were mixed to prepare a curing agent part B.

The specimens were prepared using the coating compositions prepared according to Example 2 and Comparative Examples 3 to 4, and the properties were tested. The preparation of the specimens and the physical property tests were carried out in the same manner as in the case of obtaining the results shown in Tables 1 and 2 above. The results are shown in Tables 3 and 4.

<Table 3> Non sanding type

<Table 4> Sanding Type

In Example 2, even when the content of barium sulfate was increased up to 15% by weight, it was confirmed that there was no influence on the workability and physical properties as compared with Example 1. However, as shown in Comparative Example 3, when the content of titanium dioxide was small, it was confirmed that the hiding power was greatly lowered.

Conventional two-pack type non-sanding primer-spacer coating composition is mainly used in an exchange panel operation in which uneven portions are relatively deep or pretreated. When the uneven portions are deep or damaged, the conventional two-component sanding primer- It is a situation where use is essential.

Since the multi-fryer-spacer coating composition according to the present invention can be used as a non-sanding and sanding type, it is possible to work with one product depending on the degree of damage of the uneven portion, Reduction and inventory control.

Claims (9)

A multi-primer coating composition for automobile repair having characteristics of a non-sanding primer coating or a sanding primer coating according to a mixing ratio of a main part, a hardener and a diluting solvent,
(1) Acrylic polyol resin comprising 10 to 30% by weight of styrene, 10 to 30% by weight of butyl acrylate and 10 to 30% by weight of hydroxyethyl methacrylate, and having a solid content of 40 to 60% 40 weight; (2) 5 to 15 wt% of talc having an average particle size in the range of 2 to 9 mu m; (3) 5-15 wt% barium sulfate; (4) 15 to 30% by weight of anatase or rutile type titanium dioxide; (5) 0.01 to 1% by weight of a urethane reaction promoter; And (6) 10 to 30% by weight of an organic solvent;
A curing agent part comprising an isocyanate compound; And
A multi-primer-spacer coating composition for automotive repair comprising a diluent solvent. The automotive repair multi-primer-spacer coating composition according to claim 1, wherein the acrylic polyol resin has a butyl acetate content of 40 to 60%. The acrylic polyol resin according to claim 1, wherein the acrylic polyol resin has an acid value of 5 to 30 mgKOH / g, a hydroxyl content of 2 to 7% by weight on a solid basis, a glass transition temperature in the range of 40 to 60 占 폚, and a Gardner viscosity in the range of Z to Z3 And has a number average molecular weight of 2,000 to 10,000 and a molecular weight distribution of 3 or less. The multi-primer-spacer coating composition for automobile repair according to claim 1, wherein the barium sulfate has an average particle size in the range of 2 to 9 mu m. 2. The method of claim 1, wherein when the automotive repair multi-primer-spacer coating composition is used as a sanding-type primer coating composition, a diluent of 0.8 to 1.2 times the volume of the curing agent part and 3.8 to 4.2 times the volume of the curing agent part Wherein the composition is used in a mixed manner. 2. The method of claim 1, wherein when the automotive repair multi-primer-spacer coating composition is used as a non-sanding type primer spacer paint, the amount of the main component of 3.8 to 4.2 times the volume of the curing agent and 1.8 to 2.2 times the volume of the curing agent Based coating composition for automobile repair. Coating a multi-primer-spacer coating composition for automobile repair, which is formed by mixing a main portion, a hardener portion and a diluting solvent, on a repairing substrate to prepare a primer-spacer film; And
Applying a top coat composition on the primer-surfacer film,
(1) an acrylic polyol having 10 to 30% by weight of styrene, 10 to 30% by weight of butyl acrylate and 10 to 30% by weight of hydroxyethyl methacrylate and having a solid content of 40 to 60% by weight of the total 30 to 40 weight of resin; (2) 5 to 15 wt% of talc having an average particle size in the range of 2 to 9 mu m; (3) 5-15 wt% barium sulfate; (4) 15 to 30% by weight of anatase or rutile type titanium dioxide; (5) 0.01 to 1% by weight of a urethane reaction promoter; And (6) 10 to 30% by weight of an organic solvent, wherein the curing agent part comprises an isocyanate compound. The method according to claim 7, wherein when the automotive repair multi-primer-spacer coating composition is used as a sanding primer
Wherein the main portion of the curing agent is 3.8 to 4.2 times the volume of the curing agent and the diluting solvent is 0.8 to 1.2 times the volume of the curing agent. [7] The method of claim 7, wherein when the automotive repair multi-primer-spacer coating composition is used as a non-sanding primer
Wherein the main portion of the curing agent is 3.8 to 4.2 times the volume of the curing agent and the diluting solvent is 1.8 to 2.2 times the volume of the curing agent.