KR20210076534A - Water-soluble coating composition - Google Patents

Abstract

The present invention relates to a water-soluble coating composition including: a first composition including a water-soluble polyolefin resin, an acrylic thickener, a pigment, and a first solvent; and a second composition including a water-soluble polyurethane resin, a silicate-based thickener, and a second solvent. The present invention is excellent in painting workability.

Description

Water-based paint composition {WATER-SOLUBLE COATING COMPOSITION}

The present invention relates to a water-based paint composition capable of realizing atypical and colorful patterns and having excellent paint workability, adhesion, moisture resistance, sunscreen resistance, light resistance and heat resistance.

Automotive interior parts are generally painted to improve the appearance characteristics and protect the surface of the parts from the external environment. The painting treatment is usually a pretreatment to improve the surface tension between the parts and the paint through flame or corona discharge treatment, a primer treatment to increase the adhesion between the parts and the base coating film, and a base coating film for improving the appearance characteristics of the parts and protecting the appearance. is done In this case, as a primer, a polyolefin-based resin is usually used, and the base coating film generally includes a polyurethane dispersion, a polyurethane polyol, an acrylic emulsion, and the like.

In this regard, Korean Patent Application Laid-Open No. 2015-0005843 (Patent Document 1) includes deionized water, non-halogenated polyolefin resin, polyurethane dispersion, hydrocarbon-based solvent, pigment, and additives, and the non-halogenated polyolefin is maleic acid. and a polyolefin modified with at least one in maleic anhydride, an aqueous coating composition for a base coat is disclosed. However, the aqueous paint composition for the base coat of Patent Document 1 can implement a single color or a single pattern, which has been applied to automobiles until now, but has a limitation in that it is difficult to implement three-dimensional colors and patterns.

On the other hand, it is common for paints applied to automobile interior parts to be painted with a solid color such as black or brown or a single color such as silver. However, in recent years, various studies on painting materials and methods have been conducted in order to apply luxury and new style colors to automobile interior parts.

Therefore, there is a need for research and development on a water-based paint composition that can realize luxury and a new style of color in automobile interior parts and has excellent physical properties such as paint workability, adhesion, moisture resistance, and sunscreen resistance.

Korean Patent Publication No. 2015-0005843 (published on: January 15, 2015)

Accordingly, the present invention is a water-based paint that can realize luxury and a new style of color in automobile interior parts, has excellent painting workability, and has excellent adhesion, moisture resistance, sunscreen resistance, light resistance and heat resistance of the coating film produced therefrom. A composition is provided.

The present invention relates to a first composition comprising a water-soluble polyolefin resin, an acrylic thickener, a pigment, and a first solvent; and

A water-soluble polyurethane resin, a second composition comprising a silicate-based thickener and a second solvent;

The water-based paint composition according to the present invention can implement atypical and colorful patterns on automobile interior parts and has excellent painting workability, and the coating film prepared therefrom has excellent adhesion, moisture resistance, sunscreen resistance, light resistance and heat resistance. .

Hereinafter, the present invention will be described in detail.

As used herein, "weight average molecular weight" is measured by a conventional method known in the art, for example, it can be measured by a GPC (gel permeation chromatograph) method. In addition, the "glass transition temperature" is measured by a conventional method known in the art, for example, it can be measured by differential scanning calorimetry (DSC).

The water-based paint composition according to the present invention comprises: a first composition comprising a water-soluble polyolefin resin, an acrylic thickener, a pigment, and a first solvent; and a second composition comprising a water-soluble polyurethane resin, a silicate-based thickener, and a second solvent.

The aqueous coating composition includes a first composition and a second composition that are not compatible with each other, and a coating film prepared therefrom has an irregular colorful pattern such as a marble pattern or a veneer pattern.

first composition

Water-soluble polyolefin resin

The water-soluble polyolefin resin improves adhesion to a material or a base coat, and plays a role in contributing to the physical properties of the prepared coat.

The water-soluble polyolefin resin may be a non-chlorinated polyolefin resin. In this case, the non-chlorinated polyolefin resin means a water-soluble polyolefin resin that does not substantially contain chlorine (Cl).

For example, the water-soluble polyolefin resin may include at least one selected from the group consisting of polyethylene, polypropylene, polyisopropylene, polybutylene, and copolymers thereof.

In addition, the water-soluble polyolefin resin may have a weight average molecular weight (Mw) of 50,000 to 100,000 g/mol, or 70,000 to 80,000 g/mol. When the weight average molecular weight of the water-soluble polyolefin resin is within the above range, there is an effect of excellent adhesion between the coating layers.

The water-soluble polyolefin resin may have a pH of 7 to 10, or 8 to 9. When the pH of the water-soluble polyolefin resin is within the above range, the composition has an excellent storability effect.

In addition, the water-soluble polyolefin resin may be a water-soluble polyolefin emulsion having a solid content (NV) of 20 to 40% by weight, or 28 to 32% by weight, based on the total weight of the resin. When the solid content (NV) of the water-soluble polyolefin resin is within the above range, the storage stability of the polyolefin resin itself is excellent.

The water-soluble polyolefin resin may have a melting point (Tm) of 60 to 80 °C, or 65 to 75 °C. When the melting point of the water-soluble polyolefin resin is within the above range, it is melted at a low temperature to improve adhesion.

The water-soluble polyolefin resin may be a water-soluble polyolefin emulsion. In this case, the water-soluble polyolefin resin may be in the form of an emulsion dispersed in water. When the water-soluble polyolefin resin is in the form of an emulsion dispersed in water, it is possible to lower the VOC content of the coating composition.

The water-soluble polyolefin resin may be included in the composition in an amount of 8 to 25 parts by weight, or 10 to 20 parts by weight based on 1 to 20 parts by weight of the acrylic thickener. When the content of the water-soluble polyolefin resin is within the above range, it is possible to prevent a problem in that adhesion to a material or a base coat is lowered or the appearance characteristics of the prepared coating film are lowered.

Acrylic thickener

The acrylic thickener serves to supplement the flowability of the highly polar water-soluble polyolefin resin.

Conventional polyolefin resin compositions typically include a urethane-based thickener. However, the urethane-based thickener may have a low viscosity of the composition due to insufficient thickening effect of the polyolefin resin, which causes the flow of the coating film during coating, thereby causing poor appearance of the prepared coating film. Accordingly, the water-based paint composition of the present invention uses an acrylic thickener rather than a urethane-based thickener, so that excellent painting workability and improvement in appearance characteristics of the prepared coating film can be secured.

The effect of the acrylic thickener varies depending on the pH of the paint, and the thickening effect is maximized when the paint is usually pH 7 to 10, or pH 8 to 9.

The acrylic thickener is not particularly limited as long as it can be used as a thickener in a conventional coating composition, and for example, it may be prepared by polymerizing at least one selected from the group consisting of a vinyl monomer and a (meth)acrylate monomer.

The type of the vinyl monomer is not particularly limited, but for example, styrene, methylstyrene, dimethylstyrene, fluorostyrene, ethoxystyrene, methoxystyrene, phenylene vinyl ketone, vinyl t-butyl benzoate, vinyl cyclohexa At least one selected from the group consisting of noate, vinyl acetate, vinyl pyrrolidone, vinyl chloride, vinyl alcohol, acetoxystyrene, t-butylstyrene and vinyltoluene may be used.

The type of the (meth)acrylate monomer is not particularly limited, but for example, 2-hydroxypropyl methacrylate, propyl methacrylate, t-butylaminoethyl methacrylate, dicyclopentenyl oxyethyl methacryl Late, acrylic acid dimer, hexanediol diacrylate, t-butyl acrylate, triisopropylsilyl acrylate, benzyl methacrylate, 2-hydroxyethyl methacrylate, trimethylolpropane triacrylate, tripropylene glycol diacrylic Late, ethyl methacrylate, isobutyl methacrylate, hydroxyisopropyl methacrylate, isopropyl methacrylate, cyclohexyl methacrylate, triisopropyl silyl methacrylate, isobornyl acrylate, t-butylcyclo Hexyl methacrylate, trimethylcyclohexyl methacrylate, methyl methacrylate, acrylic acid, t-butyl methacrylate, isobornyl methacrylate, methacrylonitrile, methacrylic acid, acrylamide, methacrylamide, chlorostyrene And one or more selected from the group consisting of cyclohexyl vinyl ether may be used.

The acrylic thickener may be included in the composition in an amount of 1 to 20 parts by weight, or 1 to 10 parts by weight based on 8 to 25 parts by weight of the water-soluble polyolefin resin. When the content of the acrylic thickener is within the above range, the viscosity of the composition is low, which may cause a paint flow problem, a problem that a multicolored pattern may not be implemented, and the viscosity of the composition is high, so that it cannot be painted or the appearance of the prepared coating film is poor. problems can be prevented.

pigment

The pigment serves to impart color to the prepared coating film. In this case, the pigment may be, for example, a color pigment, an extender pigment, or a mixture thereof.

The color pigment serves to secure hiding power and impart color to the coating film. In this case, the color pigment may be a black pigment, a white pigment, a blue pigment, a red pigment, a yellow pigment, a violet pigment, or a mixture thereof. In this case, as the color pigment, any commonly known color pigment may be used without particular limitation, for example, carbon black, graphite, iron oxide titanium dioxide (TiO ₂ ), chromate (PbCrO ₃ ), iron iron (Fe ₂ O). ₃ ), cobalt blue (CoO·Al ₂ O ₃ ), etc. may be used.

The extender pigment serves to increase the strength of the prepared coating film. The extender pigment may be used without any particular limitation as long as it is a commonly known component, for example, talc, calcium carbonate, barium sulfate, calcium silicate, silica, or a mixture thereof may be used.

The pigment may be included in the composition in an amount of 1 to 10 parts by weight, or 1 to 6 parts by weight based on 8 to 25 parts by weight of the water-soluble polyolefin resin. When the content of the pigment is within the above range, it is possible to prevent problems in which the hiding power of the prepared coating film is lowered or the adhesion force of the coating film is lowered.

first solvent

The first solvent serves to maintain the thickness of the prepared coating film and to improve workability by adjusting the viscosity of the coating composition.

The first solvent may include at least one selected from the group consisting of an alcohol-based solvent and water. Specifically, the first solvent may include a mixture of water and an alcohol-based solvent, but may be appropriately selected and used according to the characteristics or volatilization rate of the resin in the composition.

The water may include deionized water (DIW) and distilled water.

Examples of the alcohol-based solvent include ethanol, methanol, isopropanol, n-propanol, taxanol, ethylene glycol, propylene glycol, and mixtures thereof. In addition, the alcohol-based solvent may have a specific gravity of 0.5 to 1.5 g/cc, or 0.8 to 1.2 g/cc, and a boiling point (Bp) of 90 to 200 °C, or 100 to 200 °C.

The first solvent may be included in the composition in an amount of 56 to 80 parts by weight, or 60 to 75 parts by weight based on 8 to 25 parts by weight of the water-soluble polyolefin resin. For example, the first solvent may include 0.1 to 10 parts by weight or 0.1 to 6 parts by weight of an alcohol-based solvent, and 55 to 70 parts by weight or 60 to 68 parts by weight of water based on 8 to 25 parts by weight of the water-soluble polyolefin resin. can When the content of the first solvent in the first composition is within the above range, there is an effect of improving the storage stability of the composition, and when the content of the alcohol-based solvent is within the above range, it is difficult to form a multicolored pattern of the prepared coating film, and the composition of the composition Composition problems can be avoided.

first additive

The first composition may further include at least one first additive selected from the group consisting of a pH adjuster, an antifoaming agent, and a dispersing agent. At this time, each of the pH adjuster, the antifoaming agent and the dispersing agent is not particularly limited as long as it can be used in a conventional coating composition.

The first additive may be included in the composition in an amount of 0.1 to 10 parts by weight, or 0.1 to 5 parts by weight based on 8 to 25 parts by weight of the water-soluble polyolefin resin.

second composition

Water-soluble polyurethane resin

The water-soluble polyurethane resin plays a role in contributing to the appearance characteristics and physical properties of the prepared coating film.

The water-soluble polyurethane resin is polyether polyurethane, polyester polyurethane, polycarbonate polyurethane, polyether ester polyurethane, polyether carbonate polyurethane, polycaprolactone polyurethane, aliphatic hydrocarbon polyurethane, aromatic hydrocarbon polyurethane, and these It may be selected from a mixture of

In addition, the water-soluble polyurethane resin may be a water-soluble polyurethane dispersion having a solid content (NV) of 40 to 60% by weight, or 45 to 55% by weight, based on the total weight of the resin. When the solid content (NV) of the water-soluble polyurethane resin is within the above range, there is an effect of having good workability by proper spraying because the swellability of the coating film is good.

In this case, the water-soluble polyurethane dispersion may be in the form of dispersion dispersed in water. When the water-soluble polyurethane dispersion is in the form of a dispersion dispersed in water, it is possible to lower the VOC content of the coating composition.

The water-soluble polyurethane resin may have a minimum film formation temperature (MFFT) of -5 to 15 °C, or 0 to 10 °C. When the minimum film formation temperature of the water-soluble polyurethane resin is within the above range, the flexibility of the coating film is increased, so that it is easy to implement a colorful pattern.

In addition, the water-soluble polyurethane resin may have a pH of 6 to 9, or 7 to 8. When the pH of the water-soluble polyurethane resin is within the above range, there is an effect of excellent storability of the composition.

The water-soluble polyurethane resin may be included in the composition in an amount of 60 to 80 parts by weight, or 70 to 80 parts by weight based on 1 to 10 parts by weight of the silicate-based thickener. When the content of the water-soluble polyurethane resin is within the above range, it is possible to prevent problems in which the appearance characteristics and physical properties of the prepared coating film are reduced, or the drying and cleaning properties are deteriorated.

silicate thickener

The silicate-based thickener gels the paint composition to prevent the pigments from mixing with each other, thereby implementing a multicolored pattern.

The silicate-based thickener may be at least one selected from the group consisting of magnesium aluminum silicate, fluorine-based silicate, nanosilicate sodium silicate, potassium silicate, lithium silicate, and aluminum silicate.

In addition, the silicate-based thickener may be included in the composition in an amount of 1 to 20 parts by weight, or 1 to 10 parts by weight based on 60 to 80 parts by weight of the water-soluble polyurethane resin. When the content of the silicate-based thickener is within the above range, the viscosity of the composition is low, causing a problem of paint flow, or a problem that a colorful pattern may not be realized, and the viscosity of the composition is high, so that painting is not performed or the appearance of the prepared coating film is poor. problems can be prevented.

second solvent

The second solvent maintains the thickness of the prepared coating film and controls the viscosity of the coating composition to improve workability.

The second solvent may include at least one selected from the group consisting of an alcohol-based solvent and water. Specifically, the second solvent may include a mixture of water and an alcohol-based solvent, but may be appropriately selected and used according to the characteristics or volatilization rate of the resin in the composition.

The water may include deionized water (DIW) and distilled water.

Examples of the alcohol-based solvent include ethanol, methanol, isopropanol, n-propanol, taxanol, ethylene glycol, propylene glycol, and mixtures thereof. In addition, the alcohol-based solvent may have a specific gravity of 0.5 to 1.5 g/cc, or 0.8 to 1.2 g/cc, and a boiling point (Bp) of 90 to 200 °C, or 100 to 200 °C.

The second solvent may be included in the composition in an amount of 10 to 40 parts by weight, or 15 to 30 parts by weight based on 60 to 80 parts by weight of the water-soluble polyurethane resin. For example, the second solvent contains 1 to 10 parts by weight or 2 to 8 parts by weight of an alcohol-based solvent based on 60 to 80 parts by weight of the water-soluble polyurethane resin, and 5 to 30 parts by weight or 10 to 20 parts by weight of water. can do. When the solvent content in the composition is within the above range, there is an effect of improving the storage stability of the composition, and when the alcohol-based solvent content is within the above range, it is difficult to form a multicolored pattern of the prepared coating film, and the drying problem of the composition is prevented. can do.

second additive

The second composition may further include one or more second additives selected from the group consisting of a pH adjuster and an antifoaming agent. At this time, each of the pH adjuster and the antifoaming agent is not particularly limited as long as it can be used in a conventional coating composition.

The second additive may be included in the composition in an amount of 0.1 to 10 parts by weight, or 0.5 to 5 parts by weight based on 60 to 80 parts by weight of the water-soluble polyurethane resin.

water-based paint composition

The mixing ratio of the first composition and the second composition is not particularly limited in the water-based paint composition, and, for example, may be appropriately mixed for a desired color by an operator.

As described above, the water-based paint composition according to the present invention can implement atypical and colorful patterns on automobile interior parts, and has excellent painting workability, and the coating film prepared therefrom has adhesion, moisture resistance, sun cream resistance, light resistance and Excellent heat resistance.

Hereinafter, the present invention will be described in more detail through examples. However, these examples are only for helping the understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

[Example]

Examples 1 to 10 and Comparative Examples 1 to 5. Preparation of aqueous coating composition

Each component was mixed in the composition as shown in Tables 1 to 4 below, and the mixing weight ratio of the first composition and the second composition was mixed at the weight ratio described in Tables 1 to 4 to prepare an aqueous coating composition.

(parts by weight) Example 1 Example 2 Example 3 first composition second composition first composition second composition first composition second composition Water-soluble polyolefin resin1 10 - 15 - 19 - Water-soluble polyurethane resin1 - 79.3 - 75 - 70 pigment 6 - 5 - 5 - water 66.5 10 64 12.5 64.5 13.5 solvent 5.5 4.5 5.5 4.5 4.5 4.5 Acrylic thickener 1 10 7.5 4.5 Silicate-based thickener 1 5 6 10 pH adjuster One One 1.4 1.8 1.5 1.8 antifoam 0.5 0.2 0.8 0.2 0.6 0.2 dispersant 0.5 - 0.8 - 0.4 - total amount 100 100 100 100 100 100 Weight ratio of the first composition to the second composition 7:3 7:3 7:3

(parts by weight) Example 4 Example 5 Example 6 Example 7 first composition second composition first composition second composition first composition second composition first composition second composition Water-soluble polyolefin resin1 - - 18 - 18 - Water-soluble polyolefin resin2 18 - - - - - - - Water-soluble polyolefin resin3 - - 18 - - - - - Water-soluble polyurethane resin1 - 73.5 - 73.5 - - - - Water-soluble polyurethane resin2 - - - - - 73.5 - - Water-soluble polyurethane resin3 - - - - - - - 73.5 pigment 3 - 3 - 3 - 3 - water 64.5 13 64.5 13 64.5 13 64.5 13 solvent 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 Acrylic thickener 1 8.8 - 8.8 - 8.8 - 8.8 - Silicate-based thickener 1 - 7 - 7 - 7 - 7 pH adjuster 0.8 1.8 0.8 1.8 0.8 1.8 0.8 1.8 antifoam 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 dispersant 0.2 - 0.2 - 0.2 - 0.2 - total amount 100 100 100 100 100 100 100 100 Weight ratio of the first composition to the second composition 7:3 7:3 7:3 7:3

(parts by weight) Example 8 Example 9 Example 10 first composition second composition first composition second composition first composition second composition Water-soluble polyolefin resin1 18 - 18 - 18 - Water-soluble polyurethane resin1 - 73.5 - 73.5 - 73.5 pigment 3 - 3 - 3 - water 64.5 13 64.5 13 64.5 13 solvent 4.5 4.5 4.5 4.5 4.5 4.5 Acrylic thickener 2 8.8 - - - - - Acrylic thickener 3 - - 8.8 - - Acrylic thickener 4 - - - 8.8 - Silicate-based thickener 2 - 7 - - - - silicate thickener 3 - - - 7 - - Silicate-based thickener 4 - - - - - 7 pH adjuster 0.8 1.8 0.8 1.8 0.8 1.8 antifoam 0.2 0.2 0.2 0.2 0.2 0.2 dispersant 0.2 - 0.2 - 0.2 - total amount 100 100 100 100 100 100 Weight ratio of the first composition to the second composition 7:3 7:3 7:3

(parts by weight) Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 first composition second composition first composition second composition first composition second composition first composition second composition first composition second composition Water-soluble polyolefin resin1 18 - 25 - 18 - 18 - 20 - Water-soluble polyurethane resin1 - 76.5 - 73.5 - 71.5 - 71.5 - 71.5 pigment 3 - 5 - 3 - 3 - 3 - water 64.5 15 64.3 13 64.5 14 64.5 14 64.3 14 solvent 4.5 6.5 4.5 4.5 4.5 5.5 4.5 5.5 4.5 4.5 Acrylic thickener 8.8 - - - 8.8 7 - - - 8.8 silicate thickener - - - 7 - - 8.8 7 7 - pH adjuster 0.8 1.8 0.8 1.8 0.8 1.8 0.8 1.8 0.8 One antifoam 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 dispersant 0.2 - 0.2 - 0.2 - 0.2 - 0.2 - total amount 100 100 100 100 100 100 100 100 100 100 1st composition: weight ratio of 2nd composition 7:3 7:3 7:3 7:3 7:3

Hereinafter, manufacturers and product names of each component used in Examples and Comparative Examples are shown in Table 5 below.

ingredient remark Water-soluble polyolefin resin1 Water-soluble polyolefin emulsion (Mw 71,500g/mol, solids 30.2% by weight, pH 8.7, chlorine free, Tm 65℃) Water-soluble polyolefin resin2 Water-soluble polyolefin emulsion (Mw 75,000g/mol, solid content 30.4% by weight, pH 8.6, chlorine free, Tm 70℃) Water-soluble polyolefin resin3 Water-soluble polyolefin emulsion (Mw 78,800g/mol, solid content 30.3% by weight, pH 8.9, chlorine free, Tm 75℃) Water-soluble polyurethane resin1 Water-soluble polyurethane dispersion (solids 50.5% by weight, pH 7.7, MFFT 0.2℃) Water-soluble polyurethane resin2 Water-soluble polyurethane dispersion (solids 50.1% by weight, pH 7.9, MFFT 5.6℃) Water-soluble polyurethane resin3 Water-soluble polyurethane dispersion (solids 50.8% by weight, pH 7.3, MFFT 9.4℃) pigment A mixture of talc, titanium dioxide and carbon black in a weight ratio of 3:1:2 solvent A mixture of taxanol and propylene glycol in a weight ratio of 10:6 Acrylic thickener 1 Acrylic polymer (manufacturer: BASF, product name: Rheovis AS1130) Acrylic thickener 2 Manufacturer: BASF, product name: Rheovis HS1152 Acrylic thickener 3 Manufacturer: DOW, Product Name: DR-106 Acrylic thickener 4 Manufacturer: DOW, Product Name: TT-935 Silicate-based thickener 1 Magnesium aluminum silicate (manufacturer: BYK, product name: Optigel LX) Silicate-based thickener 2 Manufacturer: BYK, product name: Optigel WX silicate thickener 3 Manufacturer: BYK, Product Name: Laponite RD Silicate-based thickener 4 Manufacturer: BYK, product name: Laponite S482 pH adjuster dimethyl amino ethanol antifoam Manufacturer: BYK, Product Name: BKY-011 dispersant Modified polyacrylate-based dispersant (manufacturer: BASF, product name: FA4480)

Test Example: Characteristic evaluation of the prepared coating film

Apply a water-soluble primer paint (manufacturer: KCC, product name: WP1086-WHITE) on the acrylonitrile butadiene styrene (ABS, Acrylonitrile Butadiene Styrene) material with a dry film thickness of 8 to 15 ㎛, leave at room temperature for 3 minutes, and then The primer coating layer was prepared by drying with air for 5 minutes. Thereafter, the water-soluble paint compositions of Examples and Comparative Examples were coated with a dry film thickness of 20 to 45 μm, left at room temperature for 3 minutes, and then dried with hot air at 80° C. for 8 to 10 minutes to prepare a base coat layer. An oil-soluble clear paint (manufacturer: KCC, product name: UT5787F-A-9000(G-25)) is applied on the base coat layer to a dry film thickness of 25 to 40 μm, and then dried with hot air at 80° C. hardened.

The coating workability of the composition, and the appearance and physical properties of the prepared final coating film were measured as follows and evaluated according to the following evaluation criteria, and the results are shown in Table 6 below.

(1) Painting workability

A 30cmX40cm tin plate was coated with IWATA 101 (nozzle diameter: 1.5mm) two times reciprocally to compare the degree of atomization, smoothness and rise of the coating film.

At this time, if the atomization is excellent and the film rise is excellent, excellent (◎), if the atomization is normal but the film rise is excellent, good (○), if the atomization is normal and the film rise is normal, it is normal (△) , when the atomization was poor and the coating was not good, it was evaluated as poor (×).

The atomization was determined visually during coating, and the coating film thickness was measured using a coating film gauge.

(2) Appearance

It was visually judged to implement the multi-pattern shape of the surface of the prepared final coating film.

At this time, if the multicolored pattern is clear, it is evaluated as excellent (◎), if the multicolored pattern is not clear, it is evaluated as good (○). did.

(3) Adhesiveness

Based on the content described in ASTM D3359, 100 squares (width 1mm x length 1mm) were drawn on the final coating film with a blade, respectively, and removed using a tape to measure adhesion.

At this time, if 100 squares are 100% completely attached, excellent (◎), if the remaining squares are 70% or more and less than 100%, good (○), if 50% or more and less than 70%, normal (△), if less than 50%, bad ( ×).

(4) moisture resistance

After leaving the final coating film in a thermo-hygrostat at a temperature of 50° C. and a relative humidity of 98% for 7 days, the adhesion of the final coating film was evaluated, and the evaluation criteria were applied in the same manner as in the above item (3).

(5) sunscreen resistance

After applying 0.25 g of sunscreen to the entire surface of an acrylic plate (50 mm X 50 mm, width X length), a white cotton cloth of the same size was placed on top of each other, and then the final coating film was placed on the sunscreen application area and the acrylic plate was pressed to adhere. After that, it was left in a constant temperature bath at 80° C. for 1 hour and then taken out, the white cotton cloth and the acrylic plate were removed, and then left at room temperature for 10 minutes. Then, after washing with a neutral detergent and drying, the adhesion of the coating film was evaluated, and the evaluation criteria were applied in the same manner as in item (3).

(6) light resistance

After exposing 700kJ of energy to the final film for 350 minutes using the XENON-ARC-LAMP test equipment, draw 100 squares (2mm in width X 2mm in length) on the final film with a blade and peel off using tape. The adhesion, the appearance of the coating film, and the color difference were measured.

At this time, if the color change ΔE is 2.0 or less and the adhesion test result is excellent (◎), if the color change △E is 2.0 or less and the adhesion test result is 70% or more and less than 100%, good (○), the color If the change ΔE was 2.0 or less and the adhesion test result was 50% or more and less than 70%, it was evaluated as normal (Δ), and if the change in color ΔE was 2.0 or more or the adhesion test result was less than 50%, it was evaluated as poor (×).

(7) heat resistance

After leaving the final coating film in a constant temperature bath at 80° C. for 300 hours, adhesion evaluation was performed, and the adhesion was performed in the same manner as in item (3).

division Paint workability Exterior adherence moisture resistance sunscreen resistance light fastness heat resistance Example 1 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 2 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 3 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 4 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 5 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 6 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 7 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 8 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 9 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Example 10 ◎ ◎ ◎ ◎ ◎ ◎ ◎ Comparative Example 1 ◎ X ◎ ○ ○ ○ X Comparative Example 2 ◎ X ◎ ○ ○ X ○ Comparative Example 3 ◎ X ◎ X ○ ○ X Comparative Example 4 ◎ X ◎ ◎ ◎ ○ X Comparative Example 5 ◎ △ ◎ X X X ○

As shown in Table 6, the coating compositions of Examples 1 to 10 were excellent in painting workability, and the coating film prepared therefrom was excellent in appearance, adhesion, moisture resistance, sunscreen resistance, light resistance, and heat resistance.

On the other hand, Comparative Example 1 without a silicate-based thickener in the second composition, Comparative Example 2 without an acrylic thickener in the first composition, Comparative Example 3 including an acrylic thickener instead of a silicate-based thickener in the second composition, and the first composition Comparative Example 4 including a silicate thickener instead of an acrylic thickener lacked appearance properties. In addition, Comparative Example 5 including a silicate-based thickener in the first composition and an acrylic thickener in the second composition was insufficient in appearance, moisture resistance, sunscreen resistance, and the like.

Claims (5)

a first composition comprising a water-soluble polyolefin resin, an acrylic thickener, a pigment, and a first solvent; and
A water-soluble polyurethane resin, a second composition comprising a silicate-based thickener and a second solvent; Containing, a water-based paint composition. The method according to claim 1,
The first composition comprises 8 to 25 parts by weight of a water-soluble polyolefin resin, 1 to 20 parts by weight of an acrylic thickener, 1 to 10 parts by weight of a pigment, and 56 to 80 parts by weight of the first solvent. The method according to claim 1,
The second composition is an aqueous coating composition comprising 60 to 80 parts by weight of a water-soluble polyurethane resin, 1 to 20 parts by weight of a silicate-based thickener, and 10 to 40 parts by weight of a second solvent. The method according to claim 1,
Wherein the acrylic thickener is prepared by polymerizing at least one selected from the group consisting of a vinyl monomer and a (meth)acrylate monomer. The method according to claim 1,
The silicate-based thickener is at least one selected from the group consisting of magnesium aluminum silicate, fluorine-based silicate, nanosilicate sodium silicate, potassium silicate, lithium silicate and aluminum silicate, the aqueous coating composition.