KR102033290B1 - Coating kit and muti-layered film using the same - Google Patents

Abstract

The present invention provides a paint kit comprising a first paint composition comprising a first alkyd resin, a first solvent and a surface modifier and a second paint composition comprising a second alkyd resin, a polyester resin, a second solvent and a surface modifier. It relates to a multilayer coating film using the same.

Description

Paint kit and multi-layer coating film using same {COATING KIT AND MUTI-LAYERED FILM USING THE SAME}

The present invention relates to a paint kit and a multilayer coating film using the same.

In general, resin molded parts are used in the center fascia, instrument panel finishes, door garnishes, and console boxes as interior materials of automobiles, and resin molded articles are widely used as surface finishes of home appliances.

In particular, dashboards, audio decks, gear transmissions, airbags, door locks and window openings, etc., which are mounted around the driver's seat and the passenger seat inside the car, are provided with various controls and convenience devices, various controls and conveniences. In the gap between the outside of the device and the interior material, the interior finishing panel is installed to finish the interior material, which is an important factor in determining the emotional quality of the interior of the vehicle.

As such, the interior material of the car has a significant influence on the aesthetics of the inside of the car, and thus the appearance of the aesthetic demand is gradually increasing in the flow of luxury and individualization of the car.

Accordingly, in recent years, wood film materials have been developed for the purpose of improving the appearance of interior components of wood materials, which have been applied only to luxury vehicle specifications.

When using the wood solid wood material, there was a problem that the coating process takes more than a week to prevent distortion of the wood solid wood.

In the case of the coating material for wood films, it is possible to shorten the coating process because the wood characteristics such as warping are not considered. However, when the wood film paint is used, it is still difficult to maintain the feel and appearance of the wood grain, and there is a difficulty in satisfying the discoloration problem of the coating film and satisfying conditions such as adhesion, moisture resistance and light resistance.

Therefore, in addition to protecting wood materials applied to automotive interior materials, it is necessary to develop a coating composition capable of realizing coating properties such as excellent appearance, adhesion, moisture resistance, and light resistance.

Republic of Korea Patent No. 10-1726936

The present invention provides a paint kit.

Moreover, this invention provides the multilayer coating film using the said paint kit.

The present invention is the first coating composition and 10 to 20 parts by weight of the second alkyd resin, including 60 to 80 parts by weight of the first alkyd resin, 10 to 35 parts by weight of the first solvent and 0.1 to 3 parts by weight of the surface regulator, polyester resin 10 Provided is a paint kit comprising a second coating composition comprising 20 parts by weight to 20 parts by weight, 30 to 70 parts by weight of a second solvent, and 0.1 to 3 parts by weight of a surface conditioner.

The coating composition and the paint kit according to the present invention can form a multilayer coating film which can protect a substrate, in particular a substrate of a wood material, and the multilayer coating film formed thereby exhibits excellent appearance and painting workability, and at the same time, adhesion and resistance The coating film properties such as wetness, sunscreen resistance and light resistance can be improved.

Hereinafter, the present invention will be described in more detail to aid in understanding the present invention.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

The paint kit of the present invention comprises 60 to 80 parts by weight of the first alkyd resin, 10 to 35 parts by weight of the first solvent and 0.1 to 3 parts by weight of the surface modifier and 10 to 20 parts by weight of the second alkyd resin, poly The 2nd coating composition containing 10-20 weight part of ester resins, 30-70 weight part of 2nd solvents, and 0.1-3 weight part of surface modifiers is included.

The paint kit of the present invention may be applied to a wood material, for example, a wood film material, and by including the first paint composition, it is possible to protect not only the adhesion to the substrate but also the appearance of the wood material. By including 2 coating composition, the outstanding external appearance and moisture resistance of a coating film can be improved.

In particular, the paint kit of the present invention includes the specific content of the second alkyd resin, polyester resin and the second solvent, when applying the paint kit to the base material of the wood material, the wood material due to excellent moisture resistance is secured It can be safely protected and high-quality appearance characteristics can be realized.

Hereinafter, the present invention will be described in more detail.

The first coating composition of the present invention may include 60 to 80 parts by weight of the first alkyd resin, 10 to 35 parts by weight of the first solvent and 0.1 to 3 parts by weight of the surface modifier. The first coating composition can protect the appearance of the wood material and adhesion to the base material, in particular wood material, for example wood film, by having the specific composition.

Looking at the specific components of the first coating composition is as follows.

First, the first alkyd resin included in the first coating composition is used to improve adhesion to a substrate, for example, a wood material, and to improve physical properties and curing rate of the coating film, and has a solid content of 55 To 65% by weight, and may include alkyd resin having a hydroxyl group of 100 to 200 mgKOH / g. In the case of the alkyd resin including the solid content and the hydroxyl value of the above range can further enhance the adhesion to the substrate.

In the case of using the first alkyd resin, the content of the first alkyd resin may be important in order to achieve excellent appearance and improve workability and physical properties of the coating film.

According to the present invention, the first alkyd resin may be included in the first coating composition in an amount of 60 to 80 parts by weight, for example 65 to 80 parts by weight, or 68 to 78 parts by weight. If the content of the first alkyd resin is less than 60 parts by weight, there may be a problem that the adhesion to the substrate is lowered, and when the content of the first alkyd resin exceeds 80 parts by weight, the appearance of the coating film is reduced, such as the wood grains are not preserved. Problems can arise.

The first alkyd resin may have a hydroxyl value of 100 to 200 mgKOH / g, for example, a hydroxyl value of 120 to 180 mgKOH / g, or a hydroxyl value of 140 to 160 mgKOH / g. If, when the hydroxyl value of the first alkyd resin is less than 100 mgKOH / g, the crosslinking degree of the coating film is lowered, the physical properties of the coating film, such as moisture resistance may be lowered, and when the hydroxyl value exceeds 200 mgKOH / g, coating workability Deterioration, the problem that the external appearance of a coating film after coating may arise.

In addition, the first solvent included in the first coating composition is used to maintain the thickness of the coating film and to improve the painting workability, such as n-heptane, toluene, xylene, petroleum compounds, n-hexane, and the like. Nonpolar solvents; Ethyl acetate, n-butyl acetate, isobutyl acetate, ethylene glycol monoethyl ether acetate, propylene glycol monoethyl ether acetate, dibasic esters, 3-methoxy butyl acetate, amyl acetate, butyl glycol acetate, methylethylketone, methyl iso Polar solvents such as butyl ketone, acetone, dimethyl carbonate, diisobutyl ketone, isophorone and cyclohexanone; And at least one of the mixture of the nonpolar solvent and the polar solvent can be appropriately selected and used in accordance with the properties of the resin and the volatilization rate.

According to the present invention, the first solvent may be 10 to 35 parts by weight, for example 10 to 30 parts by weight, or 12 to 25 parts by weight based on 60 to 80 parts by weight of the first alkyd resin. If the content of the first solvent is used too much, problems of deterioration of adhesion or durability may occur in the overall physical properties, and when used in a small amount, it is difficult to expect an effect due to the use of the solvent.

The first coating composition according to the present invention may include a surface modifier to control the surface tension of the paint. As the surface modifier, additives generally used in paint compositions for controlling the surface tension may be used. For example, polysiloxane-based surface modifiers and / or non-silicone surface modifiers may be used. The amount of the surface modifier may be used, for example, in an amount of 0.1 to 3 parts by weight based on 60 to 80 parts by weight of the first alkyd resin. When the amount of the surface modifier used is less than 0.1 part by weight, the appearance may be lowered, and when the amount of the surface modifier is exceeded 3 parts by weight, the repaint adhesion may be lowered. The polysiloxane-based surface modifier can be obtained, for example, from Borchi Gol OL17 from OMG BORCHERS GMBH or TEGO GLIDE B1484 from EVONIK.

In addition, the first coating composition may include a urethane-based curing agent to cure the first alkyd resin. For example, the first coating composition may be a two-part coating composition including a main part including the first alkyd resin, a first solvent and a surface modifier, and a curing agent part including the urethane-based curing agent.

The urethane-based curing agent may be a urethane-based resin, specifically, a polyurethane resin having a residual isocyanate group.

In the present invention, the urethane curing agent may form a urethane coating film by itself to improve the curing rate, adhesion and moisture resistance of the coating film. In addition, the residual isocyanate group of the polyurethane resin may react with the hydroxyl group in the first alkyd resin, and the reaction ratio (NCO / OH) may be 1.03 to 1.07, and when it is lower than the above range, the coating film properties such as hardness and moisture resistance are If it is lower than the above range, the coating film dryness may be lowered.

Since the first coating composition is a two-part coating composition comprising a main portion comprising a first alkyd resin, a surface adjusting agent and a first solvent, and a curing agent portion including a urethane-based curing agent, the urethane-based curing agent is diluted with a suitable solvent to separate the container. After storage, it can be used by stirring sufficiently just before use. The dilution rate of the dilution solution containing the urethane curing agent is urethane by combining the hydroxyl portion of the first alkyd resin and the isocyanate functional group of the urethane curing agent when the main portion, that is, the solution containing the first alkyd resin and the dilution solution containing the curing agent is mixed. It can be determined by calculation so that the reaction can occur in equivalents to equivalents.

Thus, the mixing of the main portion and the curing agent portion may be, for example, in an amount of 1: 0.9 to 1: 1.2 based on the isocyanate group and hydroxyl group equivalent ratio. If the equivalent ratio is greater than 1: 1.2, there may be a problem that an unreacted curing agent is generated, and if less than 1: 0.9, there may be a problem that the degree of curing is poor.

The first coating composition may include additives such as a curing accelerator, an ultraviolet absorber, a dispersant, and a matting agent, in addition to the first alkyd resin, the first solvent, the surface modifier, and the urethane curing agent.

Looking at the additive in detail, the paint kit according to the present invention may further include a curing accelerator for promoting the reaction of the first alkyd resin and the curing agent to shorten the coating film drying and curing time.

As the curing accelerator, for example, one selected from tetramethyl butane diamine, bicyclooctane, dibutyl tin dilaurate, triethylene diamine and a mixture of two or more thereof can be used.

The amount of the curing accelerator is not particularly limited, and may be used in an amount of 0.01 to 1.0 parts by weight based on 60 to 80 parts by weight of the first alkyd resin. When the amount of the curing accelerator is less than 0.01 parts by weight, the drying property and the coating film properties may be lowered. If the amount is more than 1.0 parts by weight, the appearance deterioration and the pot life may be shortened.

The first coating composition according to the present invention may further comprise a ultraviolet absorber. The ultraviolet absorbent is stronger than the chromophore of the first alkyd resin to inhibit the generation of radicals of the first alkyd resin, and is effective in preventing discoloration, swelling, delamination, and gloss loss of the first alkyd resin. For example, the ultraviolet absorbent may include a commonly used ultraviolet absorbent. For example, the ultraviolet absorbent may include an absorbent having a benzotriazole-based structure, more specifically hydroxyphenyl benzotriazole such as TINUVIN 1130 and TINUVIN 292 manufactured by BASF.

The ultraviolet absorber may be included in an amount of 1 to 10 parts by weight based on 60 to 80 parts by weight of the first alkyd resin. If the content of the ultraviolet absorber exceeds 10 parts by weight, a problem of cost increase may occur, and if it is less than 1 part by weight, a problem of deterioration of weather resistance may occur.

In addition, according to the present invention may further comprise a dispersant in the first coating composition.

The dispersant serves to control the rheology of the paint and to ensure paint fluidity. As the dispersant, a dispersant that satisfies the condition that does not harm the rheology is suitable. For this example, one or several pigment adsorption sites and a polymer having a chain structure similar to the resin are suitable. Only dispersants that do not harm the rheology alone are suitable. In the case of use, since the color separation phenomenon may occur in the paint, the polymeric dispersant may be mixed in an appropriate amount.

The dispersant may be included in an amount of 0.1 to 1 parts by weight based on 60 to 80 parts by weight of the first alkyd resin. When it contains the dispersing agent of the said range, the effect of a dispersing agent can be exhibited efficiently.

In addition, the first coating composition may further include a nano colorant for showing color in an amount of 1 to 5 parts by weight, for example 1 to 3 parts by weight. When using the nano toning agent in the above range it can be realized an excellent color.

Nano colorants which can be used according to the invention can be used, for example, by applying organic or inorganic pigments to the colorant. In particular, the present invention can implement a variety of colors while increasing the transparency of the coating film and maintaining the feel of the wood pattern by nano-dispersing the pigment applied to the colorant to 150 to 300nm size.

The nano-coloring agent provides a color to the vehicle part, in particular a colored color, in the present invention may be used an organic or inorganic pigment that is commonly used when painting the vehicle part. The colored color may include red, yellow / orange, blue, black, white, pearl and metallic, but is not limited thereto. In addition, the pigment may adversely affect the physical properties of the coating layer when applied to the vehicle parts when used in excess, the amount of the pigment should be controlled.

If the content of the nano-coloring agent exceeds 5 parts by weight may be difficult to implement a unique wood pattern, less than 1 part by weight may have a problem of poor light resistance.

According to the present invention, the first coating composition may include 60 to 80 parts by weight of the first alkyd resin, 10 to 35 parts by weight of the first solvent, 0.1 to 3 parts by weight of the surface modifier and 1 to 5 parts by weight of the nano colorant.

On the other hand, the paint kit according to the present invention in the first coating composition as a second coating composition 10 to 20 parts by weight of the second alkyd resin, 10 to 20 parts by weight of the polyester resin, 30 to 70 parts by weight of the second solvent and surface modifier It may comprise 0.1 to 3 parts by weight. The second coating composition may implement excellent appearance and moisture resistance by having the specific composition. In particular, the second coating composition may satisfy not only the appearance of the coating film but also the workability and the coating film properties by using a mixed resin of the second alkyd resin and the polyester resin.

Looking at the specific components of the second coating composition is as follows.

First, according to the present invention, the second alkyd resin included in the second coating composition is a material that serves to improve workability and coating film properties, and has a solid content of 65 to 75 wt% and a hydroxyl value of 100 to 200 mgKOH / g alkyd resin. When the solid content and the hydroxyl value of the above range are included, workability and coating properties, in particular, light resistance may be improved.

The second alkyd resin may be included in the second coating composition in an amount of 10 to 20 parts by weight, for example, 13 to 20 parts by weight, or 15 to 20 parts by weight. When it exists in the said range, workability and coating film properties, especially light resistance can be improved. If the content of the second alkyd resin is less than 10 parts by weight, there is a problem in that the drying speed of the coating film and the like is lowered, and thus workability may be affected. Physical properties may be reduced.

The second alkyd resin may have a hydroxyl value of 100 to 200 mgKOH / g, for example, 120 to 200 mgKOH / g, or 150 to 180 mgKOH / g. When it exists in the said range, workability and coating film properties, especially light resistance can be improved. If, when the hydroxyl value of the second alkyd resin is less than 100 mgKOH / g, the crosslinking degree of the coating film is lowered, the physical properties of the coating film, such as moisture resistance may be lowered, and when the hydroxyl value exceeds 200 mgKOH / g, coating workability Deterioration, may cause a problem that the appearance of the coating film after painting is lowered

Further, according to the present invention, the polyester resin included in the second coating composition is a resin that contributes to the appearance and physical properties of the multilayer coating film, which has a solid content of 80 to 100% by weight and a hydroxyl value of 130 to 150 mgKOH / g. It may comprise a polyester resin. When using a polyester resin containing a solid content and hydroxyl value of the above range can be implemented excellent physical properties in accordance with automotive parts specifications, including moisture resistance and durability when applied to automotive interior parts, as well as physical properties of the multilayer coating film. .

In particular, in the case of the paint kit according to the present invention, through the combination of the polyester resin in which the second coating composition contributes to the appearance and physical properties and the second alkyd resin that contributes to the workability and the coating film properties, The film properties can be satisfied at the same time.

The polyester resin may be included in an amount of 10 to 20 parts by weight, for example 12 to 20 parts by weight, or 13 to 20 parts by weight based on 10 to 20 parts by weight of the second alkyd resin. When the polyester resin is in the above range, not only excellent appearance of the coating film, but also excellent moisture resistance and durability of the coating film can be realized. If the content of the polyester resin is less than 10 parts by weight, the effect of the polyester resin may be insignificant, and the drying rate of the coating film may be reduced. In addition, when the content of the polyester resin exceeds 20 parts by weight, physical properties such as light resistance may decrease.

According to the present invention, the second alkyd resin and the polyester resin may be mixed and used in a weight ratio of 1: 0.5 to 1: 2, and when the weight ratio is satisfied, not only the appearance of the coating but also workability and coating properties It can be satisfied optimally.

In addition, according to the present invention, the second solvent contained in the second coating composition is used to maintain the thickness of the coating film and to improve the painting workability, which is the same as the solvent in the first coating composition as described above. I can use it

According to the present invention, the second solvent may be 30 to 70 parts by weight, for example 40 to 65 parts by weight, or 40 to 60 parts by weight based on 10 to 20 parts by weight of the second alkyd resin. If the content of the second solvent is used too much, problems of deterioration of adhesion or durability may occur in the overall physical properties, and when used in a small amount, it is difficult to expect an effect due to the use of the solvent.

In addition, the second coating composition according to the present invention may include a surface modifier to adjust the surface tension of the paint. As the surface modifier, additives generally used in paint compositions for controlling the surface tension may be used. For example, polysiloxane-based surface modifiers and / or non-silicone surface modifiers may be used. Although there is no restriction | limiting in particular in the usage-amount of the said surface regulator, The additive in the surface regulator in the above-mentioned 1st coating composition can be used similarly.

In addition, according to the present invention, the second coating composition may include a urethane-based curing agent to cure the second alkyd resin. For example, the second coating composition may be a two-component coating composition including a main part including the second alkyd resin, a polyester resin, a second solvent, and a surface modifier, and a curing agent part including the urethane-based curing agent.

The urethane-based curing agent may be a urethane-based resin, specifically, a polyurethane resin having a residual isocyanate group, and the component and the amount of the urethane-curing agent may be used in the same manner as the urethane-based curing agent of the first coating composition as described above.

According to the present invention, the second coating composition is a curing accelerator, ultraviolet absorber, cellulose acetate butyrate (CAB) resin, dispersant and quencher, in addition to the second alkyd resin, polyester resin, surface conditioner, second solvent and urethane curing agent. And additives such as these.

Looking at the additive in detail, the paint kit according to the present invention may further include a curing accelerator for shortening the coating film drying and curing time by promoting the reaction of the second alkyd resin and polyester resin and the curing agent.

The component of the hardening accelerator can be used in the same manner as the hardening accelerator in the first coating composition as described above.

The ultraviolet absorber may be included in an amount of 1 to 10 parts by weight based on 10 to 20 parts by weight of the second alkyd resin. If the content of the ultraviolet absorber exceeds 10 parts by weight, a problem of cost increase may occur, and if it is less than 1 part by weight, a problem of deterioration of weather resistance may occur.

In addition, the second coating composition according to the present invention may further include a cellulose acetate butyrate (CAB) resin. The CAB resin may be used having a viscosity of 85-95 KU. In the second coating composition, the commercial grade of CAB, which occupies the largest portion of the colored top coat composition, is divided according to its viscosity, which is dependent on the behavior of the paint, ie spray spraying, according to the appropriate solubility combination. The impact is very large.

According to the present invention, a high-viscosity CAB resin is used. When such a CAB resin is used, spray spraying property is not only improved, but also a feeling of layer separation can be improved to improve the appearance. The content of such high viscosity CAB resin may be included in an amount of 0.1 to 5 parts by weight, for example 0.5 to 3 parts by weight, based on 10 to 20 parts by weight of the second alkyd resin. If the content of the CAB resin is less than 0.1 part by weight, the solid content of the coating film is too low to reduce the salvability of the coating film, if the content is more than 5 parts by weight may have a problem in spray dispersibility is high.

In addition, the second coating composition according to the present invention may further include a quencher. The quencher serves to reduce or eliminate the gloss of the coating film, and is not particularly limited, but may include, for example, a silica-based quencher.

The content of the silica-based quencher may include 1 to 10 parts by weight, for example, 3 to 8 parts by weight, or 4 to 7 parts by weight of the quencher, based on 10 to 20 parts by weight of the second alkyd resin. . If the content of the matting agent is too small, the expected matting effect may not be sufficiently exhibited. If the content of the matting agent is too high, workability may be poor.

According to the present invention, the second coating composition is 10 to 20 parts by weight of the second alkyd resin, 10 to 20 parts by weight of the polyester resin, 30 to 70 parts by weight of the second solvent, 1 to 5 parts by weight of the ketone solvent, surface regulator 0.1 to 3 parts by weight, cellulose acetate butyrate (CAB) resin may include 0.1 to 5 parts by weight and the ultraviolet absorber 1 to 10 parts by weight.

On the other hand, the present invention can provide a multilayer coating film prepared using the paint kit.

The multilayer coating film according to the present invention is a multilayer coating film which is coated on a substrate and sequentially comprises a first coating layer and a second coating layer, wherein the first coating layer comprises 60 to 80 parts by weight of the first alkyd resin and the first A first coating composition comprising 10 to 35 parts by weight of a solvent and 0.1 to 3 parts by weight of a surface regulator is a layer formed by coating, and the second coating layer is 10 to 20 parts by weight of the second alkyd resin and 10 to 20 parts by weight of the polyester resin. In addition, the second coating composition including 30 to 70 parts by weight of the second solvent and 0.1 to 3 parts by weight of the surface regulator may be a layer formed by coating.

The multilayer coating film according to the present invention includes the first and second coating layers having the composition, thereby realizing excellent properties such as light resistance and sunscreen resistance while maintaining the feel and appearance of the wood grain, in particular under the conditions of light resistance Discoloration can be prevented.

Specifically, referring to the multilayered coating according to the present invention, when the multilayered coating includes the first paint layer and the second paint layer, the first paint layer is a substrate, for example, a substrate of wood material, more specifically By being formed on the wood film, it is possible to protect the adhesion with the wood film and the appearance of the wood film, the second paint layer is formed on the first paint layer, it is possible to maintain the feel and appearance of the wood grain, Moisture resistance can be secured.

In addition, according to the present invention, the first coating composition and the second coating composition are mixed with a curing agent portion including a urethane-based curing agent to cure an alkyd resin or a mixed resin of an alkyd resin and a polyester resin, respectively, contained in the coating composition. Ha can be used. The urethane-based curing agent may be a urethane-based resin, specifically, a polyurethane resin having a residual isocyanate group.

According to the invention, where the multilayer coating comprises both a first paint layer and a second paint layer sequentially, the multilayer paint film of the invention comprises a first paint layer formed on a substrate, for example a wood film, thereby providing a wood film It is possible to supplement the adhesion and the appearance of the coating film, and also, by including a second coating layer on the first coating layer, it is possible to implement the excellent appearance and moisture resistance of the multilayer coating film.

In addition, the multilayer coating film according to the present invention may be sequentially coated on the substrate the first coating composition and the second coating composition using a conventional method.

Specifically, to form a first paint layer by coating and drying a first paint composition on a substrate of a wood material, for example, a wood film, and to form a second paint layer on the first paint layer. It may include.

More specifically, in the method of forming the multilayer coating film, the first coating layer may be left at room temperature for about 1 minute to 10 minutes after coating the first coating composition. In addition, the first coating layer may be formed by curing the coating film coated with the first coating composition at about 25 to 45 ° C. for 30 minutes to 2 hours. Next, a second coating composition is coated on the first coating layer, and the coated coating film is cured by hot air at about 25 to 45 ° C. for 30 minutes to 2 hours to form a second coating layer to obtain a multilayer coating film. Can be.

According to the present invention, the thicknesses of the first paint layer and the second paint layer may be variously applied to meet automotive parts standards. For example, the first paint layer is 25 to 40 μm, and the second paint layer is 10 To 30 μm.

In the case of a multilayer coating film that satisfies the thickness, excellent appearance and painting workability can be exhibited, and at the same time, physical properties in accordance with automotive parts standards such as adhesion, moisture resistance, sunscreen resistance and light resistance can be optimally satisfied.

Hereinafter, the present invention will be described in detail with reference to Examples. However, embodiments according to the present invention can be modified in many different forms, the scope of the present invention should not be construed as limited to the embodiments described below. The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

EXAMPLE

Example 1

According to the composition of Table 1, a first coating composition, a second coating composition was prepared.

<Preparation of First Coating Composition: Base Coating Composition>

1st alkyd resin (NV60%, acid value 22mgKOH / g, hydroxyl value 155mgKOH / g, Mn 1650), ultraviolet absorber (benzotriazole), polysiloxane-based surface modifier (OMG BORCHERS GMBH, Borchi Gol OL17), and mixed solvent ( n-butyl acetate: dimethyl carbonate: methyl ethyl ketone = 13.1: 4.2: 2.8 weight ratio) was put into a container, and it stirred for 30 minutes using the stirrer. The main part was manufactured by adjusting the viscosity to 51-57 KU by adding the mixing solvent further as needed to the said mixture. Subsequently, a urethane curing agent (solid content 67%, NCO content 11.5%, specific gravity 1.09 g / cm3) was added to the main body and the main body: dilution solvent (propylene glycol monomethyl ether acetate: ethyl acetate with a urethane curing agent). The first coating composition was prepared by adding the mixture at a weight ratio of 1: 1) by weight ratio of 14.5: 10.5). The viscosity of the prepared coating composition was adjusted to 15-18 seconds (FORD CUP # 4) with dilution thinner.

<Preparation of Second Coating Composition: Clear Coating Composition>

2nd alkyd resin (NV70%, acid value 15 mgKOH / g, hydroxyl value 162 mgKOH / g, Mn 1150) and polyester resin (hydroxyl value 140 mgKOH / g, MW 2800, specific gravity 1.13 g / cm3, viscosity 900 mPa s) Placed in a container and mixed at low speed using a stirrer, followed by cellulose acetate butyrate (CAB), ultraviolet absorber (benzotriazole), polysiloxane surface modifier (EVONIK, TEGO GLIDE B1484), curing accelerator (dibutyltin dilaurate) , Silica quencher (TOSOH CORPORATION, NIPSIL E-220A) and a mixed solvent (propylene glycol monomethyl ether acetate: dimethylcarbonate: methylethylketone = 42.35: 10: 4 by weight) were placed in a vessel and stirred for 30 minutes using a stirrer. . The main portion was prepared by adjusting the viscosity to 51 to 57 KU by further adding a mixed solvent to the mixture as needed. Thereafter, a urethane curing agent (solid content 67%, NCO content 11.5% specific gravity 1.09) was added to the main body at a ratio of 1: 1 based on the equivalent ratio of the main body: curing agent to prepare a second coating composition. The viscosity of the prepared coating composition was adjusted to 15-18 seconds (FORD CUP # 4) with dilution thinner.

Examples 2-14

In the same manner as in Example 1, the first paint composition and the second paint composition were prepared according to the compositions of Tables 1 and 2, respectively.

Comparative Examples 1 to 12

In the same manner as in Example 1, the first paint composition and the second paint composition were prepared according to the compositions of Tables 3 and 4, respectively.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 First 2nd First 2nd First 2nd First 2nd First 2nd First 2nd First 2nd First Alkyd Resin 74 74 74 68 63 Second Alkyd Resin 17 17 17 17 17 Tertiary alkyd resin 74 Fourth Alkyd Resin 74 Fifth Alkyd Resin 17 6th Alkyd Resin 17 Polyester resin 15 15 15 15 15 15 15 CAB One One One One One One One UV absorbers 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 8.5 4.5 Surface conditioner 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.5 0.1 Curing accelerator 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Silica matting agent 6 6 6 6 6 6 6 Nano colorant 2 2 2 2 2 2 3 solvent 18.4 56.35 18.4 56.35 18.4 56.35 18.4 56.35 18.4 56.35 24.4 56.35 25 56.35 First Coating Composition: Base Coating Composition
Second Coating Composition: Clear Coating Composition
1st alkyd resin: NV 60%, hydroxyl value (OHv) 155 mgKOH / g, acid value (Av) 22mgKOH / g, Mn1650
2nd alkyd resin: NV 70%, hydroxyl value (OHv) 162 mgKOH / g, acid value (Av) 15 mgKOH / g, Mn1150
Third alkyd resin: NV 58%, hydroxyl value (OHv) 142 mgKOH / g, acid value (Av) 25mgKOH / g, Mn1655
4th alkyd resin: NV 63%, hydroxyl value (OHv) 158 mgKOH / g, acid value (Av) 20mgKOH / g, Mn1645
Fifth alkyd resin: NV 72%, hydroxyl value (OHv) 152 mgKOH / g, acid value (Av) 12mgKOH / g, Mn1145
6th alkyd resin: NV 68%, hydroxyl value (OHv) 177 mgKOH / g, acid value (Av) 19 mgKOH / g, Mn1155

Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 Example 14 First 2nd First 2nd First 2nd First 2nd First 2nd First 2nd First 2nd First Alkyd Resin 78 74 74 74 74 74 74 Second Alkyd Resin 17 15 20 17 17 17 17 Polyester resin 15 15 15 13 18 15 15 CAB One One One One One 0.6 2.8 UV absorbers 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 Surface conditioner 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Curing accelerator 0.05 0.05 0.05 0.05 0.05 0.05 0.05 Silica matting agent 6 6 6 6 6 6 6 Nano colorant 2 2 2 2 2 2 2 solvent 14.4 56.35 18.4 58.35 18.4 53.35 18.4 58.35 18.4 53.35 18.4 56.75 18.4 54.55 First Coating Composition: Base Coating Composition
Second Coating Composition: Clear Coating Composition
1st alkyd resin: NV 60%, hydroxyl value (OHv) 155 mgKOH / g, acid value (Av) 22mgKOH / g, Mn1650
2nd alkyd resin: NV 70%, hydroxyl value (OHv) 162 mgKOH / g, acid value (Av) 15 mgKOH / g, Mn1150

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 First 2nd First 2nd First 2nd First 2nd First 2nd First 2nd First Alkyd Resin 58 74 74 74 82 74 Second Alkyd Resin 17 8.5 20 17 17 21.5 Polyester resin 15 20 8.5 15 15 12 CAB One One One One One UV absorbers 5.5 4.5 5.5 5.5 5.5 5.5 5.5 4.5 3.5 4.5 5.5 5.5 Surface conditioner 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Curing accelerator 0.05 0.05 0.05 0.05 0.05 0.05 Silica matting agent 6 6.3 6 6 6 5.3 Nano colorant 2 2 2 2 2 2 solvent 34.4 56.35 18.4 58.55 18.4 58.85 18.4 57.35 12.4 56.35 18.4 54.55 First Coating Composition: Base Coating Composition
Second Coating Composition: Clear Coating Composition
1st alkyd resin: NV 60%, hydroxyl value (OHv) 155 mgKOH / g, acid value (Av) 22mgKOH / g, Mn1650
2nd alkyd resin: NV 70%, hydroxyl value (OHv) 162 mgKOH / g, acid value (Av) 15 mgKOH / g, Mn1150

Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Comparative Example 11 Comparative Example 12 First 2nd First 2nd First 2nd First 2nd First 2nd First 2nd First Alkyd Resin 74 74 74 74 Second Alkyd Resin 15 17 17 17 7th Alkyd Resin 74 8th Alkyd Resin 17 9th Alkyd Resin 74 10th Alkyd Resin 17 Polyester resin 21.7 15 15 15 15 15 CAB One 6 One One One One UV absorbers 5.5 4.5 5.5 4.5 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Surface conditioner 0.1 0.1 0.1 0.1 5.5 4.5 5.5 4.5 5.5 4.5 5.5 4.5 Curing accelerator 0.05 0.05 0.05 0.05 0.05 0.05 Silica matting agent 5.1 6 6 6 6 6 Nano colorant 2 2 2 2 2 2 solvent 18.4 52.55 18.4 51.35 18.4 56.35 18.4 56.35 18.4 56.35 18.4 56.35 First Coating Composition: Base Coating Composition
Second Coating Composition: Clear Coating Composition
1st alkyd resin: NV 60%, hydroxyl value (OHv) 155 mgKOH / g, acid value (Av) 22mgKOH / g, Mn1650
2nd alkyd resin: NV 70%, hydroxyl value (OHv) 162 mgKOH / g, acid value (Av) 15 mgKOH / g, Mn1150
7th alkyd resin: NV 57%, hydroxyl value 97 mgKOH / g, acid value (Av) 21 mgKOH / g, Mn1645
8th alkyd resin: NV 73%, hydroxyl value 205 mgKOH / g, acid value (Av) 17 mgKOH / g, Mn1155
Ninth alkyd resin: NV 62%, hydroxyl value 203 mgKOH / g, acid value (Av) 19 mgKOH / g, Mn1660
10th alkyd resin: NV 69%, hydroxyl value 96 mgKOH / g, acid value (Av) 13 mgKOH / g, Mn1150

Experimental Example: Evaluation of Appearance and Physical Properties of Coating Film

After coating the sanding sealer (alkyd resin) on the substrate (wood film), and coating the first coating composition (base coating composition, dry coating thickness: 15-20 m) obtained in the above Examples and Comparative Examples, at room temperature It was left for 5 minutes. Then, the coating film coated with the first coating composition was cured by hot air at 40 ° C. for 1 hour, and then the surface of the wood material was cleaned with 800 sandpaper. After brushing off the residue with an air blow, a second coating composition (clear paint composition, dry film thickness: 30-35 μm) obtained in the above Examples and Comparative Examples was coated thereon, and the second coating composition was coated. The resulting coating film was cured at 40 ° C. for 3 hours in a hot air final coating film to prepare a multilayer coating film.

The coating workability of the multilayer coating film, the appearance and physical properties of the final coating film were measured as follows, and evaluated according to the following evaluation criteria. The results are shown in Tables 5 to 8 below.

<Evaluation Criteria>

◎ -excellent

○ -good

△-Normal

X-defective

1) Painting workability

Two round trips of IWATA 61 were carried out on a 30 x 40cm tin plate to compare the degree of atomization, smoothness, and film salinity of the coating.

2) Appearance

The degree of bubbles, foreign matters, spots, grooves and smoothness on the surface of the coating film was compared.

3) adhesion

Based on the ASTM D3359 tape adhesion test method, the degree of peeling after the tape adhesion test in 100 1 mm x 1 mm scales was observed.

4) moisture resistance

After the coating film was left for 7 days at 40 ° C. and 95% constant temperature and humidity bath, adhesion test and appearance evaluation were performed.

5) Sun Cream Resistance

After spreading evenly 0.25g of the sunscreen prescribed in 5cm * 5cm cotton cloth, the coating film was covered with an oligoacryl plate and allowed to stand at 80 ° C for one hour, followed by adhesion test and appearance evaluation.

6) Light resistance

The film appearance, color difference, and adhesion after exposure to an energy of 700 kJ in a Xenon Weatherometer tester environment were compared.

EXAMPLE One 2 3 4 5 6 7 Workability ◎ ◎ ◎ ◎ ◎ ◎ ◎ Exterior ◎ ◎ ◎ ◎ ◎ ◎ ◎ Adhesion ◎ ◎ ◎ ◎ ◎ ◎ O Moisture resistance ◎ ◎ ◎ ◎ ◎ ◎ O Sun Cream Resistance ◎ ◎ ◎ ◎ ◎ ◎ O Light resistance ◎ ◎ ◎ ◎ ◎ ◎ ◎

EXAMPLE 8 9 10 11 12 13 14 Workability ◎ ◎ ◎ ◎ ◎ ◎ ◎ Exterior ◎ ◎ ◎ ◎ ◎ ◎ ◎ Adhesion ◎ ◎ ◎ ◎ ◎ ◎ ◎ Moisture resistance ◎ ◎ ◎ ◎ ◎ ◎ ◎ Sun Cream Resistance ◎ ◎ ◎ ◎ ◎ ◎ ◎ Light resistance ◎ ◎ ◎ ◎ ◎ ◎ ◎

Comparative example One 2 3 4 5 6 Workability O △ ◎ △ △ ◎ Exterior O △ △ △ △ O Adhesion △ O O ◎ O O Moisture resistance △ O △ ◎ O O Sun Cream Resistance △ O ◎ ◎ O O Light resistance ◎ ◎ ◎ ◎ ◎ △

Comparative example 7 8 9 10 11 12 Workability ◎ △ O △ ◎ △ Exterior O △ O △ O △ Adhesion ◎ ◎ O O O O Moisture resistance ◎ ◎ △ O △ O Sun Cream Resistance △ ◎ △ O △ O Light resistance △ ◎ ◎ ◎ O ◎

As shown in Tables 5 to 8, the multilayer coating film prepared using the coating composition according to the present invention has a general property of workability, appearance, adhesion, moisture resistance, sunscreen resistance, and light resistance as compared with the comparative example. It was confirmed that the excellent.

Claims (6)

A first coating composition comprising 60 to 80 parts by weight of the first alkyd resin, 10 to 35 parts by weight of the first solvent and 0.1 to 3 parts by weight of the surface modifier and
A second coating composition comprising 10 to 20 parts by weight of the second alkyd resin, 10 to 20 parts by weight of the polyester resin, 30 to 70 parts by weight of the second solvent, and 0.1 to 3 parts by weight of the surface modifier,
The first paint composition and the second paint composition each of the paint kit further comprises a urethane-based curing agent.
delete The method according to claim 1,
The second paint composition is a paint kit further comprises 0.1 to 5 parts by weight of cellulose acetate butyrate (CAB) resin.
The method according to claim 1,
The first alkyd resin each has a solid content of 55 to 65% by weight, a hydroxyl value of 100 to 200 mgKOH / g,
The second alkyd resin has a solid content of 65 to 75% by weight, a hydroxyl value of 100 to 200 mgKOH / g,
The polyester resin has a solid content of 80 to 100% by weight, the paint kit of 130 to 150mgKOH / g hydroxyl group.
The method according to claim 1,
The second alkyd resin and polyester resin paint kit is included in an amount of 1: 0.5 to 1: 2 by weight.
As a multilayer coating film apply | coated on a base material and containing a 1st coating layer and a 2nd coating layer sequentially,
The first coating layer is a layer formed by coating a first coating composition comprising 60 to 80 parts by weight of the first alkyd resin, 10 to 35 parts by weight of the first solvent and 0.1 to 3 parts by weight of the surface modifier.
The second coating layer is coated with a second coating composition comprising 10 to 20 parts by weight of the second alkyd resin, 10 to 20 parts by weight of the polyester resin, 30 to 70 parts by weight of the second solvent and 0.1 to 3 parts by weight of the surface conditioner. Formed layer,
The first coating composition and the second coating composition, each multilayer coating film further comprises a urethane-based curing agent.