KR101673687B1 - White perl base paint composition - Google Patents

Abstract

More particularly, the white pearl-based coating composition of the present invention comprises 20 to 30% by weight of an acrylic resin; 8 to 15% by weight of a melamine resin; 2 to 4% by weight of mica pigment; 2 to 4% by weight of a surface conditioning agent; 2 to 5% by weight of an anti-settling agent; From 4 to 7% by weight of an anti-flow agent; And 35 to 50% by weight of a solvent.

Description

WHITE PERL BASE PAINT COMPOSITION [0001]

The present invention relates to a white pearl base coating composition, and more particularly, to a white pearl base coating composition which comprises three kinds of mica pigments having different particle sizes instead of a conventional one using a mica pigment having a particle size of one kind, And to improve the commerciality of sparkle feeling and white pearl color and to prevent the internal temperature from rising.

The exterior coating of automobile consists of four layer structure of electrodeposition, middle, base and clear. Particularly, the base layer is related to the appearance of the vehicle, and is a layer that can be immediately recognized when the customer sees the car. A layer that directly recognizes color or texture. Trends of base paints in recent years are white color, and white color (white pearl) with a graininess is high in consumer preference. The white pearl color can express a sparkle sensation by adding an inorganic particle called mica (MICA) in the white base paint. Here, mica (MICA) is a commonly used mica, and the surface of natural or synthetic mica is coated with titanium dioxide (TiO ₂ ).

However, the conventional white pearl paint has a disadvantage in that the sparkle feeling varies depending on the viewing angle, or is almost not visible. In order to improve the sparkle feeling, it may be possible to increase the amount of the existing mica particles. However, when the amount of the existing mica particles is increased, the adhesion property is weak and the physical properties of the coating film are deteriorated. Further, it is difficult to realize a sparkle feeling at various angles simply by increasing the addition amount of the mica particles.

Korean Patent No. 347723 discloses a white pearl color which is applied in order to maximize pearl color in the automobile painting process, a white pearl color of a car which is capable of drying three times of painting 3 times in the conventional drying method of No. 4 paint, A method of producing a coating material has been disclosed, but the reduction of the coating process has been mentioned only, and no disclosure has been made about the development of sparkling sensation due to the particle size of the pigment.

Therefore, it is necessary to study to improve the sparkle feeling which does not depend on the viewing angle without increasing the amount of white pearl pigment added.

In order to solve the above-mentioned problems, the present invention is to apply three kinds of mica pigments having different particle sizes compared to the conventional base paint to paints to improve the sparkle feeling by reflecting light at various angles without hindering the physical properties of the coating film And completed the present invention.

Accordingly, an object of the present invention is to provide a white pearl-based coating composition having improved sparkle feeling.

Another object of the present invention is to provide a white pearl-based coating composition which improves the merchantability of the white pearl color and prevents the internal temperature from rising.

The present invention relates to an acrylic resin composition comprising 20 to 30% by weight of an acrylic resin; 8 to 15% by weight of a melamine resin; 2 to 4% by weight of mica pigment; 2 to 4% by weight of a surface conditioning agent; 2 to 5% by weight of an anti-settling agent; From 4 to 7% by weight of an anti-flow agent; And 35 to 50% by weight of a solvent.

The white pearl base coating composition according to the present invention can be applied to paints by applying mica pigments having three different particle sizes to a paint as compared with a conventional paint using a mica pigment having one particle size, It is possible to improve the sparkle feeling by reflecting light.

In addition, the white pearl color can be used for various parts other than the body coating film by improving the merchantability, and a heat shielding effect for preventing the internal temperature from rising can be secured.

1 is a schematic view schematically showing a coating layer using a white pearl-based coating composition according to the present invention.
2 is an image photograph of the white pearl-based paint prepared in Example 1 (a) and Comparative Example (b) according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to one embodiment.

The white pearl-based coating composition of the present invention comprises 20 to 30% by weight of an acrylic resin; 8 to 15% by weight of a melamine resin; 2 to 4% by weight of mica pigment; 2 to 4% by weight of a surface conditioning agent; 2 to 5% by weight of an anti-settling agent; From 4 to 7% by weight of an anti-flow agent; And 35 to 50% by weight of a solvent.

The white pearl base coating composition is excellent in the sparkle feeling compared to the conventional one using three types of mica particles having different particle sizes without using only the mica particles having a single particle size (10 to 20 탆). And it is possible to improve the merchantability of the white pearl color. 1 is a schematic view schematically showing a coating layer using a white pearl-based coating composition according to the present invention.

The acrylic resin may be an acrylic acid-based monomer, such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tertiary butyl methacrylate, , Benzyl methacrylate, phenyl methacrylate, stearic methacrylate, cyclohexyl methacrylate, and lauryl methacrylate may be used in combination.

When the content of the acrylic resin is less than 20% by weight, the main properties such as interlayer adhesion are deteriorated. When the content is more than 30% by weight, the workability of the paint is deteriorated. When the content of the melamine resin is less than 8% by weight, the hardness of the coating film is lowered due to the lowered reactivity. When the content is more than 15% by weight, the sanding workability is lowered due to overcuring.

The mica pigment may include 0.5 to 1 wt% of a first mica, 1 to 2 wt% of a second mica, and 0.5 to 1 wt% of a third mica. Concretely, if the content of the first and third mica is less than 0.5 wt%, the effect of sparkling may be small, and if it is more than 1 wt%, the interlayer adhesion of the coating film may be deteriorated.

In this case, the first mica may have a particle size of 5 to 10 μm, the second mica may have a particle size of 11 to 20 μm, and the third mica may have a particle size of 21 to 30 μm. Specifically, when the first mica particle size is smaller than 5 μm, the effect of sparkling may be small at an angle of 75 °, and when it is larger than 10 μm, the effect of sparkling may be small at an angle of 45 °. If the third mica particle size is less than 21 탆, the sparkling effect may be small at an angle of 15 째, and if it is more than 30 탆, the coating film adhesion may be deteriorated.

The surface modifier may be a silicone-modified acrylic resin, the anti-settling agent may be a benzophenol derivative, and the flow inhibitor may be an acrylic derivative. Specifically, when the content of the surface modifier is less than 2% by weight, the smoothness of the paint decreases. When the content is more than 4% by weight, the sand markability (concealability) decreases. If the content of the anti-settling agent is less than 2% by weight, the pigment may be precipitated. If the content of the anti-settling agent is more than 5% by weight, the appearance may deteriorate. When the content of the flow inhibitor is less than 4% by weight, the SAG performance of the coating is deteriorated. When the content of the flow inhibitor is more than 5% by weight, the smoothness of the coating may be lowered.

The solvent may include 15 to 20% by weight of an aromatic hydrocarbon solvent, 15 to 20% by weight of an ether solvent, and 5 to 10% by weight of an alcohol solvent. Specifically, when the content of the solvents is less than 35% by weight, the viscosity of the paint increases and the workability of spray coating decreases. When the content of the solvents is more than 50% by weight, the viscosity of the paint decreases.

Therefore, the white pearl-based coating composition according to the present invention can be applied to paints by applying a mica pigment having three different particle sizes to a paint as compared with a paint using a conventional mica pigment having one particle size, So that the sparkle feeling can be improved. In addition, the white pearl color can be used for various parts other than the body coating film by improving the merchantability, and a heat shielding effect for preventing the internal temperature from rising can be secured.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

Example 1

As shown in the following Table 1, an acrylic resin, 26.7 wt%, melamine resin 14.1 wt%, mica pigment 2.5 wt%, surface conditioner 3.2 wt%, anti-settling agent 4.1 wt%, flow inhibitor 4.9 wt%, aromatic hydrocarbon solvent 17.8 wt , 18.4% by weight of an ether-based solvent and 8.3% by weight of an alcohol-based solvent were mixed to prepare a white pearl-based coating composition. Then, the coating material was painted using a hexamethylene diisocyanate trimer curing agent and then cured at 140 DEG C for 20 minutes to prepare a white pearl base paint.

Examples 2 and 3 and Comparative Example

The same procedure as in Example 1 was carried out except that the components and composition ratios were as shown in Table 1 below.

(% By weight) Example 1 Example 2 Example 3 Comparative Example Suzy Acrylic resin 26.7 26.7 25.3 26.7 Melamine resin 14.1 13.8 12.7 13.8 Pigment Mica (MICA) 1st mica
(5 to 10 탆) 0.5 0.7 1.0 - The second mica
(11 to 20 탆) 1.4 1.5 2.0 3.0 Third Mica
(21 to 30 탆) 0.6 1.0 1.0 - additive Surface modifier (silicone modified acrylic) 3.2 3.2 3.2 3.2 Anti-settling agent (benzophenol derivative) 4.1 4.1 4.1 4.1 Flow inhibitors (acrylic derivatives) 4.9 4.9 4.9 4.9 Solvent Aromatic hydrocarbon series 17.8 17.6 18.8 17.8 Ether system 18.4 18.4 18.9 18.4 Alcohol system 8.3 8.1 8.1 8.1 Sum 100.0 100.0 100.0 100.0 * Acrylic resin: methyl methacrylate
* Surface Conditioner: Silicone-modified acrylic
* Anti-settling agent: benzophenol derivative
* Flow inhibitors: acrylic derivatives
* Aromatic hydrocarbon solvent: toluene
* Ether solvent: N-butyl acetate
* Alcohol solvent: i-butanol

Experimental Example

In order to examine the physical properties of the white pearl base paint prepared in Examples 1 to 3 and Comparative Examples, experiments were conducted as follows. The above evaluation was made in the state of a specimen, and the results are shown in Table 2 and FIG.

1) Sparkle evaluation

By using BYK mac (BYK), the surface of the base paint to be measured was irradiated with light at an angle of 15 °, 45 ° and 75 °, and the light reflection by angle was calculated by CCD-CHIP and the SG value at the surface was measured. Here, the higher the SG value, the higher the sparkle feeling.

2) State stickiness evaluation

A perforation line was cut with a cutter so as to reach the surface of the coated film, and 100 square boxes having a size of 2 mm x 2 mm were formed. Adhesive cellophane tape was adhered to the surface, and the number of remaining coatings of the squares was confirmed after abrupt peeling at 60 ° .

3) Evaluation of water resistance

The adhesion of the coating film was measured after the internal water (40 ° C × 240Hr) using a constant temperature and humidity bath. A perforation line was cut with a cutter so as to reach the surface of the coated film, and 100 square boxes having a size of 2 mm x 2 mm were formed. Adhesive cellophane tape was adhered to the surface, and the number of remaining coatings of the squares was confirmed after abrupt peeling at 60 ° .

4) Evaluation of chipping resistance

The peeling state by chipping was measured using an internal chipping property tester.

5) Evaluation of Salt Flushing

SST tester was used to measure the state of bloating and the detachment of the film.

6) Accelerated weathering evaluation

In accordance with the provisions of SAE J 1960, the change in appearance was confirmed after irradiation at 1000 Hr.

The physical properties of the white pearl base paint prepared in Examples 1 to 3 and Comparative Examples are shown in Table 2 and FIG.

main
Evaluation items Requirements
(In accordance with the top coat paint specification for our body) Evaluation results Example 1 Example 2 Example 3 Comparative Example Sparkle feeling Sparkle feeling (SG value): 4 or more (based on 15 degrees)
※ SG value: It is a value to measure SPARKLE. The higher the value, the better the sparkle feeling.
(15 degrees, 45 degrees, 75 degrees) 15 degrees 6.15 7.62 8.12 4.13 45 degrees 3.99 4.61 5.03 1.96 75 degrees 1.87 2.46 3.47 0.07 State Attachment Must be M-2.5 or higher.
※ The smaller the number, the better. M-1.0 M-1.0 M-2.5 M-1.0 Water resistance Must be M-2.5 or higher after domestic water (40 ℃ × 240 Hr).
※ The smaller the number, the better. M-1.0 M-1.5 M-2.4 M-1.5 Chipping resistance Low temperature -30 ℃, grade 3 or higher 2nd grade 2nd grade Class 3 2nd grade Salt water silent SST 500 Hr after one side within 3 mm 1.0 mm 1.0 mm 2.0mm 1.0 mm Accelerated weathering After WOM 1000 hr, adhesion should be M-2.5 or higher.
※ The smaller the number, the better. M-1.5 M-1.5 M-2.3 M-1.5

As shown in Table 2, in the comparative example, the sparkle feeling is poor and it is difficult to realize a sparkle feeling even at various angles. On the other hand, in the case of Examples 1 to 3, the SG value is uniformly set at angles of 15 degrees, 45 degrees, and 75 degrees And it was confirmed that the sparkle feeling was excellent. In addition, it was found that the properties of the coating film were not significantly impaired due to the other adhesiveness, chipping resistance, salt water repellency and accelerated weathering resistance, which were not significantly different from the comparative examples.

2 is an image photograph of the white pearl-based paint prepared in Example 1 (a) and Comparative Example (b) according to the present invention. As shown in FIG. 2, it was found that the sparkle feeling in Example 1 (a) was superior to that of Comparative Example (b).

Therefore, the white pearl-based paint prepared in Examples 1 to 3 can be applied to paints by applying three kinds of mica pigments having different particle sizes to the paints so as to improve the sparkle feeling by reflecting light at various angles It was found that there was an effect.

Claims (6)

20 to 30% by weight of an acrylic resin;
8 to 15% by weight of a melamine resin;
2 to 4% by weight of mica pigment;
2 to 4% by weight of a surface conditioning agent;
2 to 5% by weight of an anti-settling agent;
From 4 to 7% by weight of an anti-flow agent; And
35 to 50% by weight of a solvent;
Lt; / RTI >
Wherein the mica pigment comprises 0.5 to 1 wt% of a first mica, 1 to 2 wt% of a second mica, and 0.5 to 1 wt% of a third mica,
Wherein the first mica has a particle size of 5 to 10 탆, the second mica has a particle size of 11 to 20 탆, and the third mica has a particle size of 21 to 30 탆. Coating composition.
The method according to claim 1,
The acrylic resin may be an acrylic acid-based monomer, such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tertiary butyl methacrylate, Wherein at least one monomer selected from the group consisting of benzyl methacrylate, phenyl methacrylate, stearic methacrylate, cyclohexyl methacrylate and lauryl methacrylate is bonded.
delete delete The method according to claim 1,
Wherein the surface control agent is a silicone-modified acrylic resin, the anti-settling agent is a benzophenol derivative, and the flow inhibitor is an acrylic derivative.
The method according to claim 1,
Wherein the solvent comprises 15 to 20% by weight of an aromatic hydrocarbon solvent, 15 to 20% by weight of an ether solvent, and 5 to 10% by weight of an alcohol solvent.

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