KR20190110742A - High viscosity primier-surfacer paint composition for reparing automobiles and method of repairing automobile using the same - Google Patents

Abstract

The present invention relatges to a high viscosity primer-surfacer paint composition for repairing a vehicle formed by mixing a main agent part and a hardener part, wherein the main agent part comprises: (1) 20 to 45 weight of an acryl polyol resin having solid content of 40 to 60 wt% of the total; (2) 15 to 30 wt% of talc having average particle size in a range of 2 to 9 μm; (3) 5 to 15 wt% of barium sulfate; (4) 1 to 15 wt% of titanium dioxide of an anatase type or a rutile type; (5) 0.1 to 2 wt% of a urethane reaction accelerator; and (6) an extra organic solvent, and the hardener part contains an isocyanate compound.

Description

HIGH VISCOSITY PRIMIER-SURFACER PAINT COMPOSITION FOR REPARING AUTOMOBILES AND METHOD OF REPAIRING AUTOMOBILE USING THE SAME}

The present invention relates to a high viscosity primer-surfacer coating composition for automobile repair and an automobile repair method using the same, and in particular, a high viscosity primer-surfacer paint composition for automobile repair which can increase the concealment of the undercoat by applying a viscosity of 110Ku or more. It relates to a car repair method using the same.

Due to the large size of auto repair companies and the consolidation between small companies, efforts are being made to reduce costs by shortening the working time and reducing the amount of paint to be competitive in the auto repair coating industry. Accordingly, the economics of paint and work in automobile repair coating system can be said to be of great importance.

Accordingly, the economics of paint and work in car repair painting system are of utmost importance. In addition, since a large amount of organic solvent is released into the atmosphere during coating, there is a problem that also causes environmental pollution due to volatile organic compounds (hereinafter referred to as VOC). VOC generally refers to organic compounds that are easily evaporated into the atmosphere with a sufficiently high vapor pressure at steady state. These sources include natural sources such as soil and wood, and artificial sources such as laundry solvents, coating facilities, and petroleum fuels. These VOCs are the causes of global warming that cause the greenhouse effect, and they react with nitrogen compounds in the atmosphere to cause photochemical smog and are classified as carcinogens.

In connection with recent environmental problems, the method of reducing the amount of organic solvents used in order to reduce the air pollution effect caused by the emission of VOC, and the composition containing the high-solid resin in order to improve the appearance, which is a major demand for the consumer, has limitations such as physical property degradation. There is.

Therefore, a fundamental solution for reducing the amount of paint used to reduce material costs and environmental pollution is the most demanded situation. Automotive coatings are composed of several layers of paints with different efficacies, which are classified into surface adjustment stages, intermediate process stages, and top coat stages.

The surface adjustment step includes the evaluation of damaged areas, surface preparation steps including washing of damaged areas and removal of foreign matters, and polishing and cleaning of the film to clean the grooves and scratches of the damaged areas and smoothing the surface. Step, putty polishing and cleaning step.

The intermediate stage includes a masking step of an unnecessary coating part, a degreasing step of a middle coating part, a primer-surfacer intermediate coating step of increasing corrosion and surface flatness of the damaged part, a intermediate coating drying step, a intermediate polishing and a cleaning step, and the like. .

The top coat process involves the second masking of the parts that do not need top coat, the color paint stage to match the color, the transparent paint stage to give gloss and increase durability, and finally the light to finish the exterior of the paint cleanly. This includes the stages of betting and evaluation.

The top coat step can be roughly divided into two processes. After applying the basecoat to match the color on the middle, there is a 2coat system to apply a two-component transparent paint to increase the gloss and durability, and a 1coat system to apply the two-component color paint added at once. The 2coat system can be applied to metallic, mica or solid colors. The 1coat system is mainly used for solid color products.

The conventional intermediate primer-surface should be concealed only when the putty and polishing marks of the undercoat are not impaired, and when the finish of the top coat is finished, excellent coating state can be obtained. If undercoat is not sufficient, repainting is time-consuming and expensive.

Accordingly, the technical problem of the present invention is to provide an economical high-viscosity primer-surfacer coating composition for automobile repair that maximizes the filling of pores of the undercoat and the pores of putty with high viscosity subject matter and application.

Another object of the present invention is to provide a method for repairing automobiles by applying a high viscosity primer-surfacer coating composition for automobile repair described above to increase the hiding power for undercoat.

Automotive high-viscosity primer-surfacer coating composition for realizing the above object of the present invention is formed by mixing the main portion, the hardener portion, the main portion (1) Acrylic polyol resin 20 having a solid content of 40 to 60% by weight of the total To 45 weight percent (2) 15 to 30 weight percent talc having an average particle size in the range of 2 to 9 μm (3) 5 to 15 weight percent barium sulfate; (4) 1 to 15% by weight of titanium dioxide of anatase or rutile type (5) 0.1 to 2% by weight of urethane reaction accelerator and (6) an extra organic solvent, wherein the curing agent part contains an isocyanate compound.

In one embodiment, the acryl polyol resin is formed by reacting 13 to 20% by weight of styrene, 13 to 20% by weight of butyl acrylate and 13 to 20% by weight of hydroxy ethyl methacrylate and 40 to 61% by weight of butyl acetate. Can be.

In one embodiment, the acrylic polyol resin has an acid value of 5 to 30 mgKOH / g, a hydroxyl content of 2 to 7% by weight based on a solid, a glass transition temperature of 40 to 60 ℃ range, Gardner viscosity of Z to Z3 range And a number average molecular weight ranges from 2,000 to 10,000 and a molecular weight distribution of 3 or less can be used.

The barium sulphate may be those having an average particle size of 2 to 9㎛ range.

The main portion of the high viscosity primer-surfacer coating composition for automobile repair is preferably used having a viscosity of 110 to 135Ku.

Car repair method for realizing the above object of the present invention is to prepare a primer-surfacer film by applying a high viscosity primer-surfacer coating composition for automobile repair formed by mixing the main portion, the curing agent portion on the repair substrate and the primer Applying a top coat composition onto the surface film.

In this case, the main portion 20 to 45 weight of the acrylic polyol resin having a solid content of 40 to 60% by weight of the total (2) talc 15 to 30% by weight (3) barium sulfate 5 to 15 of the average particle size range % By weight (4) 1 to 15% by weight of titanium dioxide of anatase or rutile type (5) 0.1 to 2% by weight of urethane accelerator and (6) an extra organic solvent, wherein the curing agent portion contains an isocyanate compound.

The use of such a paint composition is a high-viscosity primer-surfacer, which improves the concealing power of undercoat (putty), reducing the number of times of painting, and shortening the working time. There is this.

Hereinafter, the high viscosity primer-surfacer coating composition for automobile repair of the present invention will be described in more detail. As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, ingredient, step, process, composition, or combination thereof described on the specification, one or more other features or ingredients, It is to be understood that it does not preclude the presence or possibility of addition of steps, processes, compositions or combinations thereof.

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. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

High viscosity primer-surfacer coating composition for automobile repair

High viscosity primer-surfacer coating composition for automobile repair according to an embodiment of the present invention is a high viscosity primer for automobile repair having the characteristics of non-sanding primer surfacer paint or sanding primer surfacer paint according to the mixing ratio of the main part, the hardener part and the diluent solvent. -Surfacer paint composition.

The main part of the high-viscosity primer-surfacer coating composition for automobile repair includes (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, and the solid content is 20 to 45 weight of the acryl polyol resin which is 40 to 60 weight% of the total; (2) 15 to 30% by weight of talc with an average particle size in the range from 2 to 9 μm; (3) 5 to 15% by weight of barium sulfate; (4) 1 to 15% by weight titanium dioxide of the anatase or rutile type; (5) 0.1 to 2% by weight of a urethane reaction accelerator; And (6) extra organic solvent.

As one example, the viscosity of the subject matter of the present invention preferably has a range of 110 to 135Ku. When the viscosity of the main part is less than 110Ku, the cover-up of the surface is weak, so that the number of times of coating increases, and the coating time increases, and when the viscosity of the main part exceeds 135Ku, the viscosity increases after dilution, making the spray workability or surface spreadability weak. Occurs.

The acryl polyol resin included in the coating composition of the present invention comprises 13 to 20% by weight of styrene, 13 to 20% by weight of butyl acrylate and 13 to 20% by weight of hydroxy ethyl methacrylate and 40 to 61% by weight of butyl acetate. .

The Acrylic polyol resin has a solid content of 40 to 60% by weight of the total, an acid value of 5 to 30 mgKOH / g, a hydroxyl content of 2 to 7% by weight, a glass transition temperature of 40 to 60 ℃ range and a Gardner viscosity of Z ~ A Z3 range, a number average molecular weight in the range of 2,000-10,000, and a molecular weight distribution of 3 or less can be used. The acryl polyol resin is suitable for application to a two-component primer-surface because it has a fast curing drying rate and does not impair abrasive properties and excellent physical properties.

When the hydroxyl content is less than 2% by weight in the acryl polyol resin, the physical properties of the paint may be weak, and when the hydroxyl content is more than 7% by weight, the effect of shortening the working time may be halved due to an increase in drying time. Appropriate in the weight percent range. More preferably 1 to 3% by weight.

When the glass transition temperature is less than 40 ℃ in the acrylic polyol resin, the polishing property of the coating film is lowered, and when the glass transition temperature exceeds 60 ℃, mechanical properties such as impact resistance, flex resistance, and adhesion are lowered. Therefore, it is desirable to set the glass transition temperature to be in the range of 40 to 60 ℃.

It is preferable to use the acryl polyol resin set to 40 to 60% by weight of the solid content, and when the solid content satisfies the above conditions, it is used in the range of 20 to 45% by weight based on the total amount of the composition. If the amount thereof is less than 20% by weight, it is not preferable because the physical properties of the coating film is lowered. If the amount thereof is more than 45% by weight, the appearance of the primer is lowered, which is not preferable. Therefore, the acryl polyol resin is preferably used in the range of 20 to 45% by weight.

The talc component of the high-viscosity primer-surfacer coating composition for automobile repair of the present invention is used for the purpose of improving the filling function of the primer-surfacer and the adhesion of the applied top coat. Talc is to be used in the range of 15 to 30% by weight based on the total amount of the composition. If the amount thereof is less than 15% by weight, there may be a problem in that the adhesiveness and the filling function may be deteriorated. If the amount is more than 30% by weight, the dispersibility may be reduced due to the high viscosity.

The high viscosity primer-surfacer coating composition for automobile repair of the present invention contains barium sulfate. This is used to improve the filling function and particle size to use an average particle size of 2 to 9㎛ range. This is because the oil absorption is low when the average particle size is in the above range, so that it is easy to apply and helps to improve the particle size. The amount of barium sulphate used is in the range of 5 to 15% by weight, based on the total amount of the composition. If the amount thereof is less than 5% by weight, the filling and particle size improvement effects are insignificant. If the amount is more than 15% by weight, adhesion and physical properties may be deteriorated.

The high viscosity primer-surfacer coating composition for automobile repair of the present invention includes anatase or rutile type titanium dioxide. It is a component used for the purpose of aiding in concealment of the lower extremity or the base and for embodying the color of the primer-surfacer. The amount of titanium dioxide used is in the range of 1 to 15% by weight based on the total amount of the composition. If its amount is less than 1% by weight, the hiding power is insufficient, and thus it is difficult to function as a primer-surfer. If the amount is more than 15% by weight, the hiding power may be improved, but it may cause other physical properties.

The coating composition of the present invention also includes a urethane reaction accelerator. As a specific example, metal compounds, such as dibutyl tin dilaurate, a senior's octanate, dibutyl tin diacetate, dibutyl tin dimeractide, and triethyl diamine, triethyl ethanolamine, 1, 4- diazocyclooctane, 2-dimethyl Tertiary amines such as aminoethyl, trimethylaminoethylethanolamine, pentamethyldiethylenetriamine, dimethylethanolamine, ethyl morphine, dimethylaminoethyl morpholine, dimethylcyclohexylamine, and carboxylates and zinc-based complexes of alkali metals Varies. These can be used individually or in combination of 2 or more types.

The amount of the urethane reaction accelerator to be used is 0.1 to 2% by weight based on the total amount of the composition. If its amount is less than 0.1% by weight it is difficult to exhibit the function as a catalyst is not preferable, if the amount is more than 2% by weight of the paint available because the time available for use is shortened it 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, isobutyl methyl ketone, solvent naphtha, 1-methoxy-2-acetoxy propane, propylene glycol methyl ether propionate, toluene and the like. The said solvent can be used individually or in combination of 2 or more types.

The coating composition prepared by including the various components as described above has a high viscosity to increase the concealment, as well as reducing the material cost compared to the existing coating step, and has the effect of minimizing the impact on the atmospheric environment.

The curing agent portion applied to the high-viscosity primer-surfacer coating composition for automobile repair includes an isocyanate compound and may use an isocyanate compound dissolved in an organic solvent.

Car repair method using a high-viscosity primer-surfacer coating composition for automobile repair is to apply a high-viscosity primer-surfacer coating composition for automobile repair formed by mixing the main portion, the curing agent portion on the repair substrate to prepare a primer-surface surface film and the It can be done by performing the step of applying a top coat composition on the primer-surface film.

At this time, the main portion of the high-viscosity primer-surfacer coating composition for automobile repair 20 to 45 weight of the acrylic polyol resin having a solid content of 40 to 60% by weight of the total (2) Talc 15 to 30 having an average particle size of 2 to 9㎛ range Weight percent (3) 5-15 weight percent barium sulfate (4) 1-15 weight percent titanium dioxide of the anatase or rutile type; (5) 0.1 to 2% by weight of urethane reaction accelerator and (6) excess organic solvent. The hardener portion contains an isocyanate compound. Detailed description of the high-viscosity primer-surfacer coating composition for automobile repair has been described above in detail so as to avoid duplication.

Hereinafter, the present invention will be described in more detail with reference to specific examples. The present invention is capable of various modifications in addition to the following examples, and the scope of the present invention is not limited thereto.

Example 1

Acryl polyol resin 34.5 parts, butyl acetate 2.5 parts by weight, ethyl acetate 2 parts by weight, xylene 4.5 parts by weight, barium sulfate (Korea Semiconductor) 15 parts by weight, talc (manufactured by Youngwoo Resources) 27 parts by weight, titanium dioxide (Cosmo Chemical parts) 8.5 parts by weight, 1.2 parts by weight of a tertiary amine as a urethane reaction accelerator was mixed to prepare a main portion A.

A hardener portion B was prepared by mixing 40 parts by weight of hexamethylene diisocyanate trimer, 40 parts by weight of xylene and 60 parts by weight of butyl acetate.

Comparative Example 1

Acryl polyol resin 34.5 parts, butyl acetate 5.4 parts, ethyl acetate 3.6%, xylene 10 parts by weight, barium sulfate (Korea Semiconductor) 12.3 parts, talc (manufactured by Youngwoo Resources) 21.8 parts by weight, titanium dioxide (Cosmo 7.3 parts by weight of a chemical company, 1.2 parts by weight of a tertiary amine as a urethane reaction accelerator was mixed to prepare a main part A.

A hardener portion B was prepared by mixing 40 parts by weight of hexamethylene diisocyanate trimer, 40 parts by weight of xylene and 60 parts by weight of butyl acetate.

In order to evaluate the physical properties of the coating film using the coating composition prepared according to Example 1 and Comparative Example 1, the specimen was prepared as follows.

Evaluation example 1

The type was degreased the specimen surface-treated with zinc phosphate with Haikyu Car-Cleaner DR-180 and then coated with a primer-surfacer coating composition prepared according to Examples and Comparative Examples to a thickness of about 40 ~ 60㎛. About 15 minutes after the set time, the Haikyu basecoat metallic color was painted to a thickness of about 15-20 μm. After about 10 minutes, the HiQ Cree Coat Master Cree LV was applied twice to a thickness of about 40-60 μm. After 10 minutes of set time, heat treatment was performed 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 1 in comparison was mixed at a volume ratio of 4/1. At a relative humidity of 60% RH and a temperature of 25 ° C., a podcup # 4 viscometer was used for 14-18 seconds.

Physical properties of the cured coating specimens were performed as follows and the results are shown in Table 1.

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

2) Spray workability: The operator confirmed spraying property, wetting property and edge dusting property when spraying.

3) Surface spreadability: The surface spreadability of the coating film after worker gas spraying was confirmed.

4) Adhesion: 2 mm cross-cut, adhered to the Scotch tape, peeled off and measured.

5) Impact resistance: 500 grams of weight was dropped to measure damage to the film.

6) Flex resistance: Measured by a flexural tester with a diameter of 3/16 ".

7) Covering force: The number of coatings to cover 100% of the surface was measured.

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

9) Water resistance: After 7 days of water resistance, adhesion test was performed after standing at room temperature for 1 day.

10) Number of paintings: Number of paintings that completely cover up with the sewers

TABLE 1

As a result of evaluating the coating compositions prepared according to Example 1 and Comparative Example 1 in each of the same test specimens, the coating film prepared from the composition according to Example 1 showed concealment of the surface after only two coating times. However, the coating film made of the composition according to Comparative Example 1 showed a weak hiding force that requires three coatings.

This experiment is intended to reduce the number of coatings and to produce a high-solid paint while having the same physical properties and workability as in Comparative Example 1.

In order to further examine the physical properties of the coating composition according to an embodiment of the present invention, Example 2 and Comparative Example 2 were further performed.

Example 2

Acryl polyol resin 42 parts by weight, butyl acetate 2.5 parts by weight, ethyl acetate 2 parts by weight, xylene 3.5 parts by weight, barium sulfate (Korean semiconductor material) 13.5 parts by weight, talc (manufactured by Youngwoo Resources) 23.5 parts by weight, titanium dioxide (Cosmo Chemical parts) 7.5 parts by weight, 1.2 parts by weight of tertiary amine as a urethane reaction accelerator was mixed to prepare a main portion A.

A hardener portion B was prepared by mixing 240 parts by weight of hexamethylene diisocyanate trimer, 40 parts by weight of xylene and 60 parts by weight of butyl acetate.

Using the coating composition prepared according to Example 2 and Comparative Example 1 as described above to prepare a specimen and performed a physical property experiment. Fabrication and physical properties of the specimens were performed 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

Referring to Table 2, in Example 2, the viscosity of the talc was reduced compared to Example 1 to prevent the viscosity from rising, and it was confirmed that there was no effect on the workability and physical properties. In addition, it was confirmed that the excessive use of the talc content resulted in high viscosity and poor spray workability due to the increase of oil absorption.

Claims (7)

In the high-viscosity primer-surfacer coating composition for automobile repair formed by mixing a main portion and a curing agent portion,
(1) 20 to 45 weight of an acryl polyol resin having a solid content of 40 to 60% by weight of the total; (2) 15 to 30% by weight of talc with an average particle size in the range from 2 to 9 μm; (3) 5 to 15% by weight of barium sulfate; (4) 1 to 15% by weight titanium dioxide of the anatase or rutile type; (5) 0.1 to 2% by weight of a urethane reaction accelerator; And (6) a subject comprising an extra organic solvent;
A high viscosity primer-surfacer paint composition for automobile repair comprising a hardener comprising an isocyanate compound. The acryl polyol resin is formed by reacting 13 to 20% by weight of styrene, 13 to 20% by weight of butyl acrylate and 13 to 20% by weight of hydroxy ethyl methacrylate and 40 to 61% by weight of butyl acetate. High viscosity primer-surfacer coating composition for automobile repair. According to claim 1, wherein the acryl 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 of 40 to 60 ℃ range, Gardner viscosity of Z to Z3 range And a number average molecular weight in the range of 2,000 to 10,000 and a molecular weight distribution of 3 or less. The high viscosity primer-surfacer 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 µm. 2. The high viscosity primer-surfacer coating composition for automobile repair according to claim 1, wherein the viscosity of the main portion is 110 to 135 Ku. Preparing a primer-surfacer film by applying a high viscosity primer-surfacer paint composition for automobile repair formed by mixing a main part and a curing agent on a repair substrate; And
Applying a top coat composition on the primer-surface film;
The main part may include 20 to 45 weight of an acryl polyol resin having a solid content of 40 to 60 weight% of the total; (2) 15 to 30% by weight of talc with an average particle size in the range from 2 to 9 μm; (3) 5 to 15% by weight of barium sulfate; (4) 1 to 15% by weight titanium dioxide of the anatase or rutile type; (5) 0.1 to 2% by weight of a urethane reaction accelerator; And (6) an extra organic solvent, wherein the curing agent portion contains an isocyanate compound. The method of claim 6, wherein the acrylic polyol resin is formed by reacting 13 to 20% by weight of styrene, 13 to 20% by weight of butyl acrylate and 13 to 20% by weight of hydroxy ethyl methacrylate and 40 to 61% by weight of butyl acetate. Car repair method characterized in that.