KR20140085863A - Non-sanding primier-surfacer paint composition for reparing automobiles and method of repairing automobile using the same - Google Patents

Abstract

Provided is a non-sanding primer-surfacer paint composition for repairing an automobile, including a main composition including: (1) 15-45 wt% of acrylic polyol resin including 10-30 wt% of styrene, 10-30 wt% of butyl acrylate and 10-30 wt% of hydroxyl ethyl meta-acrylate, while having 40-60 % of solid matters; (2) 5-15 wt% of talcum having average particles sizes ranging from 4 to 10μm; (3) 5-15 wt% of barium sulfate; (4) 5-15 wt% of anatase or rutile titanium dioxide; (5) 5-15 wt% of polyester-deformed acrylic resin having 40-60 % of solid matters; (6) 0.01-1 wt% of moist dispersant having 30-70 wt% of solid matters and 100-180 mgkOH/g of acid value; (7) 0.01-1 wt% of urethane reaction accelerator; (8) 0.01-2 wt% of non-silicon-based leveling agent; and (9) 10-30 wt% of organic solvent. After plastering the paint composition, without a drying process or a polishing process, a topcoat composition can be applied within a short period of time.

Description

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

The present invention relates to a non-sanding primer-to-spacer coating composition for automobile repair, and to an automobile repair method using the same. More particularly, the present invention relates to a non-sanding primer-spacer coating composition for repairing automobiles capable of forming a coating film having excellent physical properties within a short period of time, The present invention relates to a method of repairing a used automobile.

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 can achieve the required quality such as adhesion and water resistance.

The total operation time of conventional conventional two-pack primer-spacer coatings is 10 to 15 minutes for spray coating, 3 to 4 hours for drying time, 20 to 30 minutes for polishing process, and a total of 3 hours and 30 minutes to 4 hours and 45 minutes to be. In order to shorten the drying time of the conventional conventional two-pack primer-spacer coating, thermal energy of 60 to 70 ° C is required and a heat treatment time of about 30 minutes at about 60 ° C is required.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a two-component non-sanding primer-spacer coating composition for automobile repair which has a short coating film forming time, a reduced heat treatment cost and excellent adhesion to a top coat.

Another object of the present invention is to provide a method for repairing an automobile in which a polishing process and a drying process are not separately required by applying the above paint composition.

In order to achieve the object of the present invention, the primer-spacer coating composition for automobile repair 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 15 to 45% by weight of an acrylic polyol resin having a solids content of 40 to 60% by weight of the total; (2) 5 to 15 wt% of talc having an average particle size in the range of 4 to 10 mu m; (3) 5-15 wt% barium sulfate; (4) from 5 to 15% by weight of anatase or rutile type titanium dioxide; (5) 5 to 15% by weight of a polyester-modified acrylic resin having a solids content of 40 to 60%; (6) 0.01 to 1% by weight of a wet dispersant having a solid content of 30 to 70% by weight and an acid value of 100 to 180 mg KOH / g; (7) 0.01 to 1% by weight of a urethane reaction promoter; (8) 0.01 to 2% by weight of a non-silicone leveling agent, and (9) 10 to 30% by weight of an organic solvent.

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 60 to 80% 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 polyester-modified acrylic resin is an acrylic resin comprising 10 to 30% by weight of styrene, 10 to 30% by weight of methylmethacrylate, and 10 to 30% by weight of ethylmethacrylate, Is grafted at 10 to 20 molar ratio using a peroxide-based radical initiator and the butyl acetate content may be 40 to 60 wt%.

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

In one embodiment, the automotive repair primer-spacer coating composition may further comprise a curing agent composition comprising an isocyanate compound.

Another object of the present invention is to provide a rubber composition which 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, 15 to 45% by weight of an acrylic polyol resin; (2) 5 to 15 wt% of talc having an average particle size in the range of 4 to 10 mu m; (3) 5-15 wt% barium sulfate; (4) from 5 to 15% by weight of anatase or rutile type titanium dioxide; (5) 5 to 15% by weight of a polyester-modified acrylic resin having a solids content of 40 to 60%; (6) 0.01 to 1% by weight of a wet dispersant having a solid content of 30 to 70% by weight and an acid value of 100 to 180 mg KOH / g; (7) 0.01 to 1% by weight of a urethane reaction promoter; (8) 0.01 to 2% by weight of a non-silicone leveling agent and (9) 10 to 30% by weight of an organic solvent, and applying the primer- Producing a membrane; And applying a top coat composition on the primer-surfacer film.

In one embodiment, the set time can be applied for about 5 to 15 minutes at room temperature after application of the coating composition.

In one embodiment, the application process of the coating composition is applied for about 5 to 15 minutes, and after the application of the set time, the topcoat composition application process may be performed directly without a separate drying process and polishing process.

By using such a coating composition, the working time can be shortened to 10 to 15 minutes for spray painting and 5 to 15 minutes for set time, so that the working time can be greatly reduced And it is not necessary to apply heat energy for drying, and it is only necessary to set time at room temperature for about 10 minutes.

Hereinafter, 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.

Hereinafter, the present invention will be described in detail.

The non-sanding primer-spacer coating composition for automobile repair according to an embodiment of the present invention comprises 15 to 45% by weight of an acrylic polyol resin having a solid content of 40 to 60% by weight (2) a talc 5 having an average particle size of 4 to 10 (5) from 5 to 15% by weight of a polyester-modified acrylic resin having a solids content of from 40 to 60%; (3) from 5 to 15% by weight of barium sulfate; (6) 0.01 to 1 wt% of a wet dispersant having a solid content of 30 to 70 wt% and an acid value of 100 to 180 mgKOH / g (7) 0.01 to 1 wt% of a urethane reaction promoter (8) % And (9) 10 to 30% by weight of an organic solvent.

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

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 DEG C 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 can be used.

Such an acrylic polyol resin is suitable for application to a two-component non-sanding 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 become poor. If the content of hydroxyl groups exceeds 7% by weight, the effect of shortening the working time may be reduced due to a decrease 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 less, the abrasiveness of the coating film is deteriorated. When the glass transition temperature exceeds 60 캜, when the glass transition temperature is too high, impact resistance and flex resistance are deteriorated due to the brittleness. 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 a range of 15 to 45 wt% based on the total amount of the composition. If the amount is less than 15% by weight, the physical properties of the coating film may be deteriorated when the non-sanding process is applied. If the amount is more than 45% by weight, the appearance of the primer may deteriorate. Therefore, the acrylic polyol resin is preferably used in the range of 15 to 45% 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. The talc is non-spherical and preferably has an average particle size in the range of 4 to 10 mu m. If the average particle size is less than 4 mu m, the viscosity of the composition may increase due to excessive oil absorption, and the appearance of the primer-spacer may be poor. If the average particle size is more than 10 mu m, the non- This is because it can be.

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 and the application is easy. 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 also 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 5 to 15% by weight based on the total amount of the composition. If the amount is less than 5% by weight, the hiding power is lowered and the primer-spacer function is difficult to exhibit. If the amount is more than 15% by weight, the hiding power is improved but other properties may be deteriorated.

The coating composition of the present invention includes a polyester-modified acrylic resin. This is to be used for maintaining excellent adhesion with the top coat, that is, the base coat and the top coat color paint, even if the primer-surface coat is not polished after the coating. If the coating composition does not contain a polyester-modified acrylic resin, it is suitable for application as a conventional general primer-spacer, but if it is used in a non-sanding method, adhesion with the top coat is deteriorated. However, when a polyester-modified acrylic resin is used, the tackiness of the surface is maintained to some extent and the adhesion to the top surface can be maintained excellent.

The polyester-modified acrylic resin is obtained by adding tetrahydrophthalic anhydride to an acrylic resin containing 10 to 30% by weight of styrene, 10 to 30% by weight of methylmethacrylate, 10 to 30% by weight of ethylmethacrylate and an excess solvent, Based radical initiator in the range of 10 to 20 molar equivalents. For example, the polyester-modified acrylic resin may be a resin having a butyl acetate content of 40 to 60% by weight.

The polyester-modified resin preferably has a glass transition temperature in the range of 10 to 30 ° C and a number-average molecular weight in the range of 1,000 to 3,000. In this case, the polyester-modified resin maintains excellent appearance of the top surface and improves adhesion with the top surface to be.

The polyester-modified resin is contained in an amount 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 with the topcoat decreases. If the amount of the used amount exceeds 15% by weight, the dryness decreases and it is not preferable.

The coating composition of the present invention also includes a wetting and dispersing agent. The wetting and dispersing agent makes use of a concentrated aggregate type to prevent sedimentation of inorganic fillers and pigments having a high specific gravity among the constituents of the paint and to prevent color separation. It can be used with a solid content of 30 to 70% by weight and an acid value of 100 to 180 mgKOH / g.

The wetting and dispersing agent is used 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 not sufficient to obtain the effect shown. If the amount is more than 1% by weight, the physical properties of the coating film 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 coating composition of the present invention includes a non-silicon-based acrylic leveling agent. This increases the leveling property of the coating film, improves the smoothness and improves the appearance of the top surface. In general, a silicon-based polydimethylsiloxane leveling agent is used. However, in the present invention, a non-silicone leveling agent based on an acrylic resin is used because silicone can be a risk factor for adhering to the upper surface due to the characteristics of the undercoat.

The non-silicone leveling agent is used in the range of 0.01 to 2% by weight based on the total amount of the composition. If the amount is less than 0.01% by weight, it is insufficient to exhibit the effect to be obtained. If the amount is more than 2% by weight, crater induction may occur.

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 thereof include xylene, butyl acetate, ethyl acetate, isobutyl methyl ketone, solvent naphtha, 1-methoxy-2-acetoxypropane, propylene glycol methyl ether propionate and toluene, Is in the range of 10 to 30% by weight. These solvents may be used alone or in combination of two or more.

The coating composition prepared with various components as described above is a non-sanding primer-spacer for two-pack type automobile repairing, and there is no need for heat treatment or a separate drying time after coating using it. And only a set time of about 5 to 15 minutes is required at room temperature, so that the working time is greatly shortened.

Since the drying time is short and the top coating composition can be applied directly to the upper part (polishing sanding) without the polishing operation after coating the primer-surface coating, the working time and effort can be saved. In addition, the use of talc having an average particle size suitable for application to the non-sanding primer-surfacer makes it possible to maintain a good topical appearance without polishing.

Further, by blending the polyester-modified acrylic resin, it is possible to solve problems such as deterioration in adhesion and vulnerability to water, which may occur in the case of non-sanding. As a result, the work time and effort are significantly reduced while exhibiting properties equivalent to or better than those of conventional primer-surface coatings.

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 >

By weight of an acrylic polyol resin, 33% by weight of an acrylic polyol resin, 13% by weight of a polyester-modified acrylic resin, 8% by weight of butyl acetate, 4% by weight of solvent naphtha, 4% by weight of 1-methoxy- 13 wt% of barium sulfate (Korean Semiconductor Co.), 13 wt% of talc (NIPPON TALC), 10 wt% of titanium dioxide (manufactured by Cosmo Chemical Co.), 0.5 wt% of BYK-358N (BYK Co.) 0.4 wt% of dibutyltin dilaurate as a urethane reaction promoter 1, and 0.1 wt% of a tertiary amine as a urethane reaction accelerator 2 were mixed to prepare a coating composition A as a main composition.

40 parts by weight of hexamethylene diisocyanate trimer, 40 parts by weight of xylene and 60 parts by weight of butyl acetate were mixed to prepare a coating composition B as a curing agent composition.

The coating composition A and the coating composition B were mixed in a volume ratio of 4/1 to prepare an automotive repair primer-surface coating composition according to an embodiment of the present invention.

≪ Example 2 >

36 wt% of acrylic polyol resin, 10 wt% of polyester modified acrylic resin, 8 wt% of butyl acetate, 4 wt% of solvent naphtha, 4 wt% of 1-methoxy-2-acetoxypropane and DISPERBYK-110 13% by weight of talc (NIPPON TALC), 10% by weight of titanium dioxide (manufactured by Cosmo Chemical), 0.5% by weight of BYK-358N (manufactured by BYK) as a leveling agent 0.4% by weight of dibutyltin dilaurate as a urethane reaction promoter 1 and 0.1% by weight of a tertiary amine as a urethane reaction accelerator 2 were mixed to prepare a coating composition A as a main composition.

40 parts by weight of hexamethylene diisocyanate trimer, 40 parts by weight of xylene and 60 parts by weight of butyl acetate were mixed to prepare a coating composition B as a curing agent composition.

The coating composition A and the coating composition B were mixed in a volume ratio of 4/1 to prepare an automotive repair primer-surface coating composition according to an embodiment of the present invention.

≪ Comparative Example 1 &

, 4 wt% of 1-methoxy-2-acetoxypropane, 1 wt% of DISPERBYK-110 (manufactured by BYK) as a wetting and dispersing agent, and 4 wt% of barium sulfate 15% by weight of talc (NIPPON TALC), 10% by weight of titanium dioxide (manufactured by Cosmo Chemical), 0.5% by weight of BYK-358N (manufactured by BYK) as a leveling agent, dibutyltin 0.4% by weight of dilaurate and 0.1% by weight of tertiary amine as urethane reaction promoter 2 were mixed to prepare a coating composition A as a main composition.

40 parts by weight of hexamethylene diisocyanate trimer, 40 parts by weight of xylene and 60 parts by weight of butyl acetate were mixed to prepare a coating composition B as a curing agent composition.

The coating composition A and the coating composition B were mixed at a volume ratio of 4/1 to prepare a primer-spacer coating composition for automobile repair according to the comparative example.

In order to evaluate the physical properties of the coating films prepared using the coating compositions prepared according to Examples 1 to 2 and Comparative Example 1, the following specimens were prepared.

The 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 15 to 25 μm. After about 10 minutes of set time, the hue base coat metallic color was painted 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 a set time of 10 minutes, it was heat-treated at about 60 DEG C for about 30 minutes. The coating performance was evaluated after 3 hours.

The coating composition A and the coating composition B were mixed so that the hydroxy equivalent and the isocyanate equivalent were 1: 0.8 to 1.2. Relative humidity of 60% RH, and temperature of 25 ° C for 12 to 16 seconds with a Ford Cup # 4 viscometer. The compositions according to Examples 1 and 2 were painted once, the composition according to the Comparative Example was painted for 5 minutes 2 times.

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

1) Topical viscosity: Viscosity was measured at 25 ° C with a KU (krebs stomer) viscometer.

2) Spray workability: The worker confirmed the sprayability, wettability, and edge dustiness during spraying.

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

4) Appearance of object: After preparing specimen, gloss was measured with a BYK gardner (20 ㅀ / 60 ㅀ).

5) Adhesiveness: 2 mm cross-cut, adhered with a Scotch tape, and then peeled off.

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

7) Flexural strength: Measured by a flexural tester of 3/16 "diameter.

8) Water Resistance: The specimen was immersed in water at 40 ° C for 7 days to measure the gloss loss and defect occurrence of the coating film.

9) Water resistance: Water resistance After 7 days, it was allowed to stand at room temperature for 1 day and then tested for adhesion.

<Table 1>

The coating compositions prepared according to Examples 1 and 2 and Comparative Example 1 were produced by the non-sanding process with no drying time. As a result, the coatings prepared with the compositions according to Examples 1 and 2, And good water resistance and water resistance. However, the coating film prepared with the composition according to Comparative Example 1 exhibited poor gloss of the top coat, poor adhesion, water resistance and water resistance. That is, when the compositions of Examples 1 and 2 are used, the effect of shortening the drying time and shortening the working time by the non-sanding process can be obtained, but when the composition of Comparative Example 1 is used, Can be confirmed.

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

&Lt; Example 3 >

33% by weight as an acrylic polyol resin (Noru Paint Co., Ltd.), 13% by weight as a polyester-modified acrylic resin (Noru Paint Co., Ltd.), 8% by weight of butyl acetate, 4% by weight of solvent naphtha, 4% by weight of 2-acetoxypropane, 1% by weight of wet dispersant (by BYK), 11% by weight of barium sulfate (Korean semiconductor material), 15% by weight of talc (NIPPON TALC) , 0.5% by weight of a leveling agent (manufactured by BYK), and 0.5% by weight of a urethane reaction promoter were mixed to prepare a paint composition A as a main composition.

40 parts by weight of hexamethylene diisocyanate trimer, 40 parts by weight of xylene and 60 parts by weight of butyl acetate were mixed to prepare a coating composition B as a curing agent composition.

The coating composition A and the coating composition B were mixed in a volume ratio of 4/1 to prepare an automotive repair primer-surface coating composition according to an embodiment of the present invention.

&Lt; Comparative Example 2 &

, 13 wt% of polyester-modified acrylic resin (manufactured by Noru Paint Co., Ltd.), 8 wt% of butyl acetate, 4 wt% of solvent naphtha, 1 wt% of 1-methoxy- 1% by weight of 2-acetoxypropane, 1% by weight of wet dispersant (by BYK), 13% by weight of barium sulfate (Korea Semiconductor), 13% by weight of talc having an average particle size of about 20 μm, ), 0.5% by weight of a leveling agent (manufactured by BYK), and 0.5% by weight of a urethane reaction promoter were mixed to prepare a coating composition A as a main composition.

40 parts by weight of hexamethylene diisocyanate trimer, 40 parts by weight of xylene and 60 parts by weight of butyl acetate were mixed to prepare a coating composition B as a curing agent composition.

The coating composition A and the coating composition B were mixed at a volume ratio of 4/1 to prepare a primer-spacer coating composition for automobile repair according to the comparative example.

&Lt; Comparative Example 3 &

10% by weight of an acrylic polyol resin (manufactured by Norul Paint Co., Ltd.), 10% by weight of polyester modified acrylic resin (manufactured by Norul Paint Co., Ltd.), 8% by weight of butyl acetate, 4% by weight of solvent naphtha, 4% by weight of acetoxypropane, 1% by weight of wet dispersant (BYK), 9% by weight of barium sulfate (Korean semiconductor material), 22% by weight of talc (NIPPON TALC), 9% by weight of titanium dioxide 0.5% by weight as a charge control agent (manufactured by BYK) and 0.5% by weight of a urethane reaction promoter were mixed to prepare a coating composition A as a main composition.

40 parts by weight of hexamethylene diisocyanate trimer, 40 parts by weight of xylene and 60 parts by weight of butyl acetate were mixed to prepare a coating composition B as a curing agent composition.

The coating composition A and the coating composition B were mixed at a volume ratio of 4/1 to prepare a primer-spacer coating composition for automobile repair according to the comparative example.

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

<Table 2>

In Example 3, even when the content of talc was increased up to 15% by weight, it was confirmed that the viscosity and the workability and physical properties were not affected. However, as in Comparative Example 2, when a large talc having an average particle size out of the range of about 4 to 10 mu m is used, it can be confirmed that the gloss of the top surface is reduced.

Also, as in Comparative Example 3, when the content of talc is used in excess, it can be seen that the viscosity is high due to the increase of oil absorption and the spraying workability is not good. In order to compare the degree of shortening of the working time, the coating compositions prepared according to Example 3 and Comparative Example 1 were used to carry out the steps according to the coating specification. The coating composition according to Example 3 was applied in the same manner as the test method of the coating film described above.

The coating composition according to Comparative Example 1 was applied once again after painting for one minute and then once again for 10 minutes according to the coating specification to give a coating thickness of 40 to 60 占 퐉. The primary was then dried at room temperature for 3 hours and then dry sanded to 400 wood abrasive paper. The secondary was heat-treated at 60 ° C for 30 minutes and then dry-sanded with 400 wood polishers. The subsequent top coat process was applied in the same manner.

As a result of checking the working time, the coating process using the coating composition of Comparative Example 1 took about 200 to 220 minutes, the coating time being about 10 minutes, the drying time being about 180 minutes at room temperature, and the polishing time being about 20 minutes. The process took about 70 minutes to 75 minutes, with a coating time of about 10 minutes, a set time of about 10 minutes, a drying time of about 30 minutes at 60 DEG C, and a polishing time of about 20 minutes. In contrast, the coating process using the coating composition of Example 3 took about 15 minutes, with a coating time of about 5 minutes and a set time of about 10 minutes.

It can be seen that the conventional primer-surfactant coating composition is significantly longer than the working time using the coating composition of the present invention even when the heat treatment at 60 ° C is performed to reduce the working time. Further heat treatment costs are incurred.

The non-sanding primer-spacer coating composition for automobile repair according to the present invention does not require a drying process and a polishing process, thereby greatly shortening the working time. Even if the working time is shortened, it is possible to maintain the same or higher quality in terms of physical properties and workability.

According to such an automobile repair method, it is possible to save energy with excellent workability and economy.

Claims (9)

(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% 45% by weight;
(2) 5 to 15 wt% of talc having an average particle size in the range of 4 to 10 mu m;
(3) 5-15 wt% barium sulfate;
(4) from 5 to 15% by weight of anatase or rutile type titanium dioxide;
(5) 5 to 15% by weight of a polyester-modified acrylic resin having a solids content of 40 to 60%;
(6) 0.01 to 1% by weight of a wet dispersant having a solid content of 30 to 70% by weight and an acid value of 100 to 180 mg KOH / g;
(7) 0.01 to 1% by weight of a urethane reaction promoter;
(8) 0.01 to 2% by weight of a non-silicon leveling agent; And
(9) 10 to 30% by weight of an organic solvent. The coating composition according to claim 1, wherein the acrylic polyol resin has a butyl acetate content of 40 to 60% by weight based on the acrylic polyol resin. 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 The number average molecular weight is in the range of 2,000 to 10,000, and the molecular weight distribution is 3 or less. The polyester-modified acrylic resin according to claim 1, wherein the polyester-modified acrylic resin is an acrylic resin containing 10 to 30% by weight of styrene, 10 to 30% by weight of methylmethacrylate, 10 to 30% by weight of ethylmethacrylate, Wherein the hydrotalc phthalic acid is formed by grafting a peroxide radical initiator at a molar ratio of 10 to 20. The coating composition according to claim 1, wherein the barium sulfate has an average particle size in the range of 2 to 9 mu m. The coating composition according to claim 1, wherein the automotive repair primer-spacer coating composition is further mixed with a curing agent composition containing an isocyanate compound. Applying an automotive repair primer-spacer coating composition comprising the subject composition onto a repairing substrate to produce a primer-spacer film; And
Applying a top coat composition on the primer-surfacer film,
The subject composition
(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% 45% by weight; (2) 5 to 15 wt% of talc having an average particle size in the range of 4 to 10 mu m; (3) 5-15 wt% barium sulfate; (4) from 5 to 15% by weight of anatase or rutile type titanium dioxide; (5) 5 to 15% by weight of a polyester-modified acrylic resin having a solids content of 40 to 60%; (6) 0.01 to 1% by weight of a wet dispersant having a solid content of 30 to 70% by weight and an acid value of 100 to 180 mg KOH / g; (7) 0.01 to 1% by weight of a urethane reaction promoter; (8) 0.01 to 2% by weight of a non-silicone leveling agent, and (9) 10 to 30% by weight of an organic solvent. The method according to claim 7, wherein the set time is applied for about 5 to 15 minutes at room temperature after applying the coating composition. 9. The method according to claim 8, wherein the application step of the coating composition is applied for about 5 to 15 minutes, and after the application of the set time, the topcoating composition application step is carried out directly without a separate drying step and polishing step Repair method.