KR102616672B1 - A coating agent for interior materials for automobile, method for forming coating layer of interior materials for automobile using the same, and interior materials thereof - Google Patents

Abstract

The present invention relates to a coating agent for automobile interior materials, a method of forming a coating layer for automobile interior materials using the same, and automobile interior materials formed using the same. In a specific example, the coating agent for automobile interior materials includes 100 parts by weight of a first acrylic polyol resin having a glass transition temperature (Tg) of 40 to 90°C, 5 to 40 parts by weight of a polyester polyol resin, 1 to 100 parts by weight of a colorant, and aluminum (Al ) Undercoat layer forming agent containing 1 to 30 parts by weight of paste; and a top coat layer forming agent comprising 100 parts by weight of a second acrylic polyol resin having a glass transition temperature (Tg) of 60 to 90°C and 5 to 25 parts by weight of beads.

Description

Coating agent for automobile interior materials, method of forming a coating layer for automobile interior materials using the same, and automobile interior materials formed using the same

The present invention relates to a coating agent for automobile interior materials, a method of forming a coating layer for automobile interior materials using the same, and automobile interior materials manufactured using the same. More specifically, it relates to a coating agent for automobile interior materials that can simultaneously achieve a metallic appearance and a rusty surface texture, and automobile interior materials formed using the same.

Recently, with the advancement of automobiles, the physical properties and characteristics required for automobile interior paints are increasing. Meanwhile, the surfaces of interior materials for automobile multimedia, such as audio, were treated using methods such as IPE (Ion Plasma Evaporation), chrome (Cr) plating layer formation, and metallic coating layer formation.

The IPE is a method of depositing an aluminum (Al)-based pigment on the surface of an interior material substrate in a vacuum state, and can be applied to substrates of various materials, and the color can be adjusted by topcoat (clear). The IPE method can be achieved by sequentially forming a primer layer, a middle layer (Al deposition), and a top layer (clear) on a substrate.

The chrome (Cr) plating layer is a method of forming a coating layer containing a metal such as chromium on the surface using an electrolyte between the cathode and the anode. The chrome plating layer forming method includes a nickel layer, a copper layer, and a nickel layer on the substrate. and chromium layers may be formed sequentially.

The metallic coating layer uses a coating agent that can be spray-painted, and can give a metallic texture to the surface of the interior material by using the light reflection and scattering effects of aluminum (Al) pigment.

However, in the case of the IPE and chrome plating layer formation process, there was a problem of low yield of good products and high process cost compared to the general spray painting method, and in the case of metallic paint, the appearance performance was significantly reduced compared to the IPE and chrome plating layer formation process using actual metal. , Currently mass-produced paints for forming metallic coating layers are limited to creating a visual metallic feel.

Background technology related to the present invention is disclosed in Republic of Korea Patent Publication No. 2016-0139206 (published on December 7, 2016, title of the invention: coating agent for matte dry plating coating and painting method using the same).

One object of the present invention is to provide a coating agent for automobile interior materials with excellent surface texture and aesthetics.

Another object of the present invention is to provide a coating agent for automobile interior materials with excellent adhesion to a substrate, reliability, and mechanical properties.

Another object of the present invention is to provide a coating agent for automobile interior materials with a low defect rate and excellent productivity and economic efficiency.

Another object of the present invention is to provide a method of forming a coating layer for automobile interior materials using the coating agent for automobile interior materials.

Another object of the present invention is to provide an automobile interior material formed using a coating agent for automobile interior materials.

One aspect of the present invention relates to a coating agent for automobile interior materials. In one embodiment, the coating agent for automobile interior materials includes 100 parts by weight of a first acrylic polyol resin having a glass transition temperature (Tg) of 40 to 90°C, 5 to 40 parts by weight of a polyester polyol resin, 1 to 100 parts by weight of a colorant, and aluminum ( Al) Undercoat layer forming agent containing 1 to 30 parts by weight of paste; and a top coat layer forming agent comprising 100 parts by weight of a second acrylic polyol resin having a glass transition temperature (Tg) of 60 to 90°C and 5 to 25 parts by weight of beads.

In one embodiment, the first acrylic polyol resin and the second acrylic polyol resin may include two or more acrylic polyol resins each having different glass transition temperatures (Tg).

In one embodiment, the first acrylic polyol resin is 20 to 50% by weight of an acrylic polyol resin having a glass transition temperature (Tg): 40°C to 50°C; Glass transition temperature (Tg): 20 to 50% by weight of acrylic polyol resin exceeding 50°C and below 70°C; and 10 to 35% by weight of an acrylic polyol resin having a glass transition temperature (Tg) of more than 70°C and less than or equal to 90°C, wherein the second acrylic polyol resin is an acrylic polyol with a glass transition temperature (Tg) of 60°C to 70°C. Resin 40-60% by weight; And a glass transition temperature (Tg): 40 to 60% by weight of an acrylic polyol resin having a glass transition temperature of more than 70°C and less than or equal to 90°C.

In one embodiment, the polyester polyol resin may have a glass transition temperature (Tg) of -20°C to 20°C.

In one embodiment, the undercoat forming agent may include the polyester polyol resin and the first acrylic polyol resin in a weight ratio of 1:5 to 1:15.

In one embodiment, the beads may have an average particle diameter of 5 to 25 ㎛ and a specific gravity of 1.0 to 2.0.

In one embodiment, the top coat layer forming agent and the bottom coat forming agent may each further include a solvent.

In one embodiment, the aluminum paste includes spherical or plate-shaped aluminum (Al) powder, and the aluminum powder may have an average size of 5 to 20 μm.

In one embodiment, the coloring agent may include one or more of dyes and pigments.

The beads may include one or more of silicone beads, urethane beads, and acrylic beads.

Another aspect of the present invention relates to a method of forming a coating layer for automobile interior materials using a coating agent for automobile interior materials. In one embodiment, the method of forming a coating layer for an automobile interior material includes 100 parts by weight of a first acrylic polyol resin having a glass transition temperature (Tg) of 40 to 90° C., 5 to 40 parts by weight of a polyester polyol resin, and 1 to 1 to 10 parts by weight of a colorant on at least a portion of the substrate. Forming an undercoat layer by applying and curing an undercoat layer forming agent containing 100 parts by weight and 1 to 30 parts by weight of aluminum (Al) paste; And forming a top coat layer by applying and curing a top coat layer forming agent containing 100 parts by weight of a second acrylic polyol resin and 5 to 25 parts by weight of beads with a glass transition temperature (Tg) of 60 to 90°C on the surface of the undercoat layer. Step; includes.

In one embodiment, the undercoat layer and the top coat layer may be formed by curing the applied undercoat layer former and the top coat layer former at 70 to 100°C, respectively.

Another aspect of the present invention relates to an automobile interior material including a coating layer formed using the coating agent for automobile interior materials. In one embodiment, the automobile interior material includes a substrate; Formed on at least a portion of the substrate, 100 parts by weight of a first acrylic polyol resin having a glass transition temperature (Tg) of 40 to 90°C, 5 to 40 parts by weight of polyester polyol resin, 1 to 100 parts by weight of colorant, and aluminum (Al ) Undercoat layer containing 1 to 30 parts by weight; and a top coat layer formed on the surface of the undercoat layer, in which 5 to 25 parts by weight of beads are dispersed in a second acrylic polyol resin matrix having a glass transition temperature (Tg) of 60 to 90°C. One or more irregularities are formed.

In one embodiment, the height of the irregularities is 0.3-20㎛, and the longitudinal cross-section may be hemispherical or semi-elliptical.

In one embodiment, the thickness of the undercoat layer may be 3 to 15 ㎛, and the thickness of the top coat layer may be 20 to 35 ㎛.

When applying the coating agent for automobile interior materials according to the present invention, a rusty surface texture and a metallic appearance are achieved, resulting in excellent aesthetics, excellent adhesion between the coating layer and the substrate, reliability and mechanical properties, and a low defect rate. , productivity and economic efficiency can be excellent.

Figure 1 shows an automobile interior material according to one embodiment of the present invention.

In describing the present invention, if it is determined that a detailed description of related known technology or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

In addition, the terms described below are terms defined in consideration of the functions in the present invention, and may vary depending on the intention or custom of the user or operator, so the definitions should be made based on the content throughout the specification explaining the present invention.

Coating agent for automobile interior materials

One aspect of the present invention relates to a coating agent for automobile interior materials. The coating agent for automobile interior materials includes 100 parts by weight of a first acrylic polyol resin having a glass transition temperature (Tg) of 40 to 90°C, 5 to 40 parts by weight of polyester polyol resin, 1 to 100 parts by weight of colorant, and 1 part of aluminum (Al) paste. A base layer former comprising ~30 parts by weight; and a top coat layer forming agent comprising 100 parts by weight of a second acrylic polyol resin having a glass transition temperature (Tg) of 60 to 90°C and 5 to 25 parts by weight of beads.

sublayer forming agent

First acrylic polyol resin

The first acrylic polyol resin has a glass transition temperature (Tg) of 40 to 90°C. If the glass transition temperature is less than 40°C, the adhesion between the undercoat layer and the substrate or the top coat layer decreases and the mechanical strength decreases, and if it exceeds 90°C, the adhesion, heat resistance, and impact resistance may decrease.

In one embodiment, the hydroxyl value of the first acrylic polyol resin may be 9 to 200 mgKOH/g. Under the above conditions, the mechanical strength of the undercoat layer may be excellent.

In one embodiment, the first acrylic polyol resin may include two or more acrylic polyol resins having different glass transition temperatures (Tg). For example, the first acrylic polyol resin is 20 to 50% by weight of an acrylic polyol resin with a glass transition temperature (Tg): 40°C to 50°C; Glass transition temperature (Tg): 20 to 50% by weight of acrylic polyol resin exceeding 50°C and below 70°C; And it may include 10 to 35% by weight of an acrylic polyol resin having a glass transition temperature (Tg): more than 70°C and less than 90°C. When the acrylic polyol resin of the glass transition temperature condition is included in the above weight range, the mixability and compatibility with the undercoat forming agent can be excellent, and adhesion and mechanical strength can be excellent.

polyester polyol resin

The polyester polyol resin is included for the purpose of ensuring impact resistance, chemical resistance, and adhesion of the undercoat layer.

In one embodiment, the polyester polyol resin may have a glass transition temperature (Tg) of -20°C to 20°C. In the above glass transition temperature range, adhesion, strength, and chemical resistance may be excellent.

In one embodiment, the hydroxyl value of the polyester polyol resin may be 50 to 250 mgKOH/g. Under the above conditions, the mechanical strength of the undercoat layer may be excellent.

In one embodiment, the polyester polyol resin is included in an amount of 5 to 40 parts by weight based on 100 parts by weight of the first acrylic polyol resin. When the polyester polyol resin is included in an amount of less than 5 parts by weight, impact resistance and strength are reduced, and when it is included in more than 40 parts by weight, the adhesion between the undercoat layer and the substrate or top coat layer is reduced, and the strength may be reduced.

In one embodiment, the undercoat forming agent may include the polyester polyol resin and the first acrylic polyol resin in a weight ratio of 1:5 to 1:15. When included within the above weight ratio range, the adhesion, chemical resistance, and mechanical strength of the undercoat may be excellent. For example, it may be included in a weight ratio of 1:8 to 1:12.

colorant

The colorant is included along with the aluminum paste for the purpose of imparting color and a metallic appearance to the undercoat layer of the present invention.

In one embodiment, the coloring agent may include one or more of dyes and pigments. The pigment may include one or more of an organic pigment and an inorganic pigment. For example, pigments of black, red, and orange colors dispersed in one or more of cellulose acetate butyrate (CAB) resin and acrylic resin may be used as the colorant.

In one embodiment, the colorant is included in an amount of 1 to 100 parts by weight based on 100 parts by weight of the first acrylic polyol resin. When the colorant is included in less than 1 part by weight, it is difficult to realize the color and the appearance is deteriorated, and when the colorant is included in more than 100 parts by weight, the mixability and mechanical strength of the undercoat layer components may be reduced.

Aluminum (Al) paste

The aluminum paste is included for the purpose of giving a metallic appearance to the undercoat layer of the present invention.

In one embodiment, the aluminum paste may include spherical or plate-shaped aluminum (Al) powder and a solvent. In a specific example, the aluminum powder may have an average size of 5 to 20 μm. The average size of the aluminum powder may mean diameter or maximum length.

In one embodiment, the aluminum paste is included in an amount of 1 to 30 parts by weight based on 100 parts by weight of the first acrylic polyol resin. When the aluminum paste is included in less than 1 part by weight, the appearance deteriorates, and when the aluminum paste is included in more than 30 parts by weight, the mechanical strength of the undercoat layer may be reduced.

top layer forming agent

Second acrylic polyol resin

The second acrylic polyol resin includes one having a glass transition temperature (Tg): 60 to 90°C. If the glass transition temperature is less than 60°C, the adhesion between the top and bottom coat layers decreases and mechanical strength decreases, and if it exceeds 90°C, adhesion, heat resistance, and impact resistance may decrease.

In a specific example, the second acrylic polyol resin may include two or more acrylic polyol resins having different glass transition temperatures (Tg). For example, the second acrylic polyol resin is 40 to 60% by weight of an acrylic polyol resin having a glass transition temperature (Tg): 60°C to 70°C; And a glass transition temperature (Tg): 40 to 60% by weight of an acrylic polyol resin having a glass transition temperature of more than 70°C and less than or equal to 90°C. When the acrylic polyol resin of the glass transition temperature condition is included in the above weight range, the mixability and compatibility with the top coat forming agent can be excellent, and adhesion and mechanical strength can be excellent.

In one embodiment, the hydroxyl value of the second acrylic polyol resin may be 20 to 200 mgKOH/g. Under the above conditions, the mechanical strength of the top coat layer may be excellent.

bead

The beads form irregularities on the surface of the top coat layer, express a rusty texture, and provide a visual effect by reflection and scattering of incident light, thereby improving aesthetics.

In one embodiment, the beads may include one or more of silicone beads, urethane beads, and acrylic beads.

In one embodiment, the beads may have an average particle diameter of 5 to 25㎛. Under the above particle size conditions, irregularities can be easily formed on the surface of the top coat layer, excellent mixing and dispersibility, and excellent diffusion and reflection effects of light incident from the outside can be achieved, thereby ensuring excellent appearance.

In one embodiment, the beads may have a specific gravity of 1.0 to 2.0. Under the above conditions, irregularities can be easily formed on the surface of the top coat layer.

In one embodiment, the beads are included in an amount of 5 to 25 parts by weight based on 100 parts by weight of the second acrylic polyol resin. When the bead is included in an amount of less than 5 parts by weight, the effect of forming irregularities on the surface of the top coat layer is minimal, and when the bead is included in an amount exceeding 25 parts by weight, the mechanical properties of the top coat layer may be reduced.

solvent

In one embodiment, the top coat layer forming agent and the bottom coat forming agent may each further include a solvent. In one embodiment, the solvent may include one or more of a hydrocarbon-based solvent, a ketone-based solvent, and an acetate-based solvent. For example, it may include one or more of a hydrocarbon-based solvent and a ketone-based solvent.

In one embodiment, the hydrocarbon-based solvent may be naphtha or an aromatic hydrocarbon-based solvent. The aromatic hydrocarbon-based solvent may include one or more of cyclohexanone, xylene, and toluene. In one embodiment, the ketone solvent may include one or more of acetone, acetonitrile, methyl ethyl ketone, and methyl isobutyl ketone. In one embodiment, the acetate-based solvent may include one or more of ethyl acetate, n-butyl acetate, cellosolve acetate, propylene glycol monomethyl acetate, and ethylene glycol diacetate.

In one embodiment, the undercoat layer former further includes 25 to 150 parts by weight of a solvent based on 100 parts by weight of the first acrylic polyol resin, and the top coat layer former includes 25 to 150 parts by weight of a solvent based on 100 parts by weight of the second acrylic polyol resin. It may further include ~150 parts by weight. When included in the above amount, mixability, dispersibility, and workability can be excellent.

Method of forming a coating layer for automobile interior materials using a coating agent for automobile interior materials

Another aspect of the present invention relates to a method of forming a coating layer for automobile interior materials using the coating agent for automobile interior materials.

In one embodiment, the method of forming a coating layer for automobile interior materials using the coating agent for automobile interior materials includes 100 parts by weight of a first acrylic polyol resin having a glass transition temperature (Tg) of 40 to 90°C, and 5 to 5 parts of a polyester polyol resin on at least a portion of the substrate. Forming an undercoat layer by applying and curing an undercoat layer forming agent containing 40 parts by weight, 1 to 100 parts by weight of colorant, and 1 to 30 parts by weight of aluminum (Al) paste; And forming a top coat layer by applying and curing a top coat layer forming agent containing 100 parts by weight of a second acrylic polyol resin and 5 to 25 parts by weight of beads with a glass transition temperature (Tg) of 60 to 90°C on the surface of the undercoat layer. Step; includes.

Since the components and contents of the base layer former and the top layer former can be used as those described above, detailed description thereof will be omitted.

In one embodiment, the undercoat layer and the top coat layer may be formed by curing the applied undercoat layer former and the top coat layer former at 70 to 100°C, respectively. When cured under the above conditions, the top coat layer and bottom coat layer can be easily formed.

For example, an undercoat layer former is applied to at least a portion of the substrate, then cured at 70 to 100° C. for 5 to 15 minutes to form an undercoat layer, and a top layer former is applied to the surface of the undercoat layer. Next, the top coat layer can be formed by curing at 70 to 100°C for 30 minutes to 5 hours.

Automotive interior materials manufactured using coating agents for automobile interior materials

Another aspect of the present invention relates to automobile interior materials manufactured using the coating agent for automobile interior materials.

Figure 1 shows an automobile interior material according to one embodiment of the present invention. Referring to FIG. 1, the automobile interior material 100 includes a base material 10; It is formed on at least a portion of the substrate 10, and includes 100 parts by weight of a first acrylic polyol resin having a glass transition temperature (Tg) of 40 to 90°C, 5 to 40 parts by weight of polyester polyol resin, 1 to 100 parts by weight of colorant, and aluminum. An undercoating layer (20) containing 1 to 30 parts by weight of (Al); and a top coat layer (30) formed on the surface of the undercoat layer (20), in which 5 to 25 parts by weight of beads are dispersed in a second acrylic polyol resin matrix having a glass transition temperature (Tg) of 60 to 90°C. One or more irregularities 32 are formed on the surface of the layer 30.

In one embodiment, the substrate 10 may include one or more of a thermoplastic resin and a thermosetting resin.

Referring to Figure 1, the height (H) of the unevenness 32 may be 0.3 to 20㎛. Additionally, the height (H) of the irregularities may be the distance between the lowest and uppermost surfaces of the top coat layer 30. In an embodiment, the unevenness 32 may have a hemispherical or semi-elliptical longitudinal cross-section. In one embodiment, the irregularities 32 may be formed by exposing the beads to the surface of the matrix. In another embodiment, the irregularities 32 may be formed by coating the surface of the bead with a second acrylic polyol resin.

In one embodiment, the thickness of the undercoat layer 20 may be 3 to 15 ㎛, and the thickness of the top coat layer 30 may be 20 to 35 ㎛. When formed in the above thickness range, the surface texture and appearance can be excellent, as well as the adhesion between the coating layer and the substrate, reliability, and mechanical properties. Referring to FIG. 1, the thickness T ₂ of the top coat layer 30 may be a measured value including irregularities formed on the surface of the top coat layer 30.

The automobile interior material including a coating layer to which the coating agent for automobile interior materials according to the present invention is applied realizes a rusty surface texture and metallic appearance, enabling high sensitivity of the product, and improving adhesion between the coating layer and the substrate, reliability, and mechanical properties. It has excellent performance, has a low defect rate, and can simplify the process and reduce post-processing costs compared to existing IPE deposition and chrome plating processes, resulting in excellent productivity and economic efficiency.

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this is presented as a preferred example of the present invention and should not be construed as limiting the present invention in any way.

Any information not described here can be technically inferred by anyone skilled in the art, so description thereof will be omitted.

Example and Comparative example

(One) sublayer forming agent

(A) First acrylic polyol resin: Glass transition temperature (Tg): 35% by weight of acrylic polyol resin having a glass transition temperature (Tg) of 40℃ to 50℃ Glass transition temperature (Tg): 40% by weight of acrylic polyol resin having a glass transition temperature of more than 50℃ and less than or equal to 70℃ Temperature (Tg): A first acrylic polyol resin containing 25% by weight of acrylic polyol resin was prepared, with a temperature of more than 70°C and less than 90°C.

(B) Polyester polyol resin: A polyester polyol resin with a glass transition temperature (Tg): -20°C to 20°C was used.

(C) Colorant: Pigments of black, red, and orange colors dispersed in cellulose acetate butyrate (CAB) resin and acrylic resin were used.

(D) Aluminum (Al) paste: Aluminum (Al) paste containing spherical aluminum powder with an average particle diameter of 5 to 7 μm and a solvent was used.

(E) Solvent: Hydrocarbon-based, ester-based, and ketone-based solvents were used.

(2) top layer forming agent

(A) Second acrylic polyol resin: Contains 50% by weight of an acrylic polyol resin with a glass transition temperature (Tg) of 60°C to 70°C and 50% by weight of an acrylic polyol resin with a glass transition temperature (Tg) of more than 70°C and less than or equal to 90°C. A second acrylic polyol resin was used.

(B) Bead: Spherical acrylic beads with an average particle diameter of 20㎛ and a specific gravity of 1 to 2 were used.

(C) Solvent: Hydrocarbon-based, ester-based, and ketone-based solvents were used.

Example 1~2

By applying the ingredients and contents listed in Table 1 below, a base layer former and a top layer former (CERASOL, Hansol CNP) were prepared.

Comparative example 1~5

The undercoat layer former and the top coat layer former were prepared in the same manner as in Example 1, except that the ingredients and contents shown in Table 1 below were applied.

Manufacture of automobile interior materials : Examples 1 to 2 and Comparative Examples 1 to 5 were applied to manufacture automobile interior materials. An undercoat layer former was applied to one surface of the polyolefin-based substrate, then cured at 80°C for 5 minutes to form an undercoat layer with a thickness of 5 to 10㎛, and a top layer former was applied to the surface of the undercoat layer. Next, it was cured at 80°C for 3 hours to form a top coat layer with a thickness (T ₂ ) of 25 ㎛, and the surface of the top coat layer had a hemispherical or semi-elliptical longitudinal cross-section and one or more irregularities with a height (H) of 5 ㎛. It was formed to manufacture automobile interior materials.

The reliability of the automobile interior materials of Examples 1 to 2 and Comparative Examples 1 to 5 prepared above was evaluated in the following manner based on the MS655-08 standard.

(1) Adhesion: Using a cutter, draw a perforation line on the undercoat layer and topcoat layer formed on the specimens of Examples and Comparative Examples to a depth that reaches the surface of the substrate, create 100 squares of 2mm x 2mm, and apply adhesive cellophane tape to the surface. After adhesion and rapid peeling at 90°C, the number of remaining coating films in the square was evaluated. If it was less than 90, it was judged to be defective, and if it was more than 90, it was judged to be good.

(2) Heat resistance: Example and comparative example specimens were left at 110°C for 500 hours, and then the appearance and adhesion of the top and bottom coat layers of the specimens were visually observed and judged to be good or bad.

(3) Heat resistance cycle: Example and comparative example specimens were left at 110°C for 3 hours → left at -40°C for 3 hours → left at 50°C and relative humidity of 90%RH for 7 hours as 1 cycle, and 5 cycles were performed. Next, the appearance and adhesion of the top and bottom coat layers of the specimen were visually observed and judged as good or bad.

(4) Moisture resistance: Example and comparative example specimens were left for 168 hours at 50°C and relative humidity of 95%RH, and then the appearance and adhesion of the top and bottom coat layers of the specimens were visually observed and rated as good or poor. Judgment was made.

(5) Light resistance: Example and comparative example specimens were irradiated with light of 1,050 kJ/m ² and then the appearance and adhesion of the top and bottom coat layers of the specimens were observed with the naked eye and judged to be good or poor.

(6) Abrasion resistance: After evaluating the specimens of Examples and Comparative Examples for 10,000 abrasion tests using a reciprocating abrasion tester, the appearance and adhesion of the top and bottom coat layers of the specimens were visually observed and judged to be good or bad.

(7) Scratch resistance: After evaluating the scratch resistance using sapphire with a curvature of 0.5R under a load of 500 g on the specimens of Examples and Comparative Examples, the appearance and adhesion of the top and bottom coat layers of the specimen were visually observed to be good. Or it was judged to be defective.

(8) Chemical resistance: Examples and comparative examples The specimens were immersed in gasoline and 5 other chemicals, then taken out, the appearance and adhesion of the top and bottom coat layers of the specimen were observed with the naked eye and judged to be good or bad.

(9) Sunscreen resistance: Examples and Comparative Examples Apply Nivea sunscreen (SPF47) to the surface of the specimen, leave at 100°C for 1 hour, wipe off, and visually check the appearance and adhesion of the top and bottom coats of the specimen. It was observed and judged as good or bad.

(10) Odor: Examples and Comparative Examples After the specimens were left at 100°C for 2 hours, they were tested in a closed space to see if they emit an odor and judged to be good or bad.

Referring to the results in Table 2, the examples according to the present invention had excellent adhesion, chemical resistance, and mechanical properties between the top coat layer, bottom coat layer, and substrate, and were effective in various anodizing ( It was found that the number of processes and costs could be reduced compared to surface treatment methods using actual metal materials by realizing color, visual corrosion, three-dimensional effect, and depth.

Comparative Examples 1 and 2 where the polyester polyol resin content in the undercoat layer former of the present invention is out of range, Comparative Example 3 where the aluminum paste content is out of range in the undercoat layer former of the present invention, and bead content in the top coat layer former of the present invention. In the case of Comparative Examples 4 to 5 that were out of range, it was found that adhesion, chemical resistance, or mechanical properties were lowered compared to the above Examples.

Simple modifications or changes to the present invention can be easily implemented by those skilled in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

10: base material 20: undercoat layer
30: Top layer 32: Irregularities
100: Automotive interior materials

Claims (15)

Glass transition temperature (Tg): 100 parts by weight of a first acrylic polyol resin of 40 to 90°C, 5 to 40 parts by weight of polyester polyol resin, 1 to 100 parts by weight of colorant, and 1 to 30 parts by weight of aluminum (Al) paste. Subcoat former; and
A top coat layer former comprising 100 parts by weight of a second acrylic polyol resin with a glass transition temperature (Tg): 60 to 90°C and 5 to 25 parts by weight of beads;
The first acrylic polyol resin is 20 to 50% by weight of an acrylic polyol resin with a glass transition temperature (Tg): 40°C to 50°C; Glass transition temperature (Tg): 20 to 50% by weight of acrylic polyol resin exceeding 50°C and below 70°C; And a glass transition temperature (Tg): 10 to 35% by weight of an acrylic polyol resin having a glass transition temperature of more than 70°C and less than or equal to 90°C.
The second acrylic polyol resin is 40 to 60% by weight of an acrylic polyol resin having a glass transition temperature (Tg): 60°C to 70°C; And a glass transition temperature (Tg): 40 to 60% by weight of an acrylic polyol resin having a glass transition temperature (Tg) of more than 70°C and less than 90°C.
delete delete The coating agent for automobile interior materials according to claim 1, wherein the polyester polyol resin has a glass transition temperature (Tg) of -20°C to 20°C.
The coating agent for automobile interior materials according to claim 1, wherein the undercoat forming agent includes the polyester polyol resin and the first acrylic polyol resin in a weight ratio of 1:5 to 1:15.
The coating agent for automobile interior materials according to claim 1, wherein the beads have an average particle diameter of 5 to 25㎛ and a specific gravity of 1.0 to 2.0.
The coating agent for automobile interior materials according to claim 1, wherein the top coat layer forming agent and the bottom coat forming agent each further include a solvent.
The method of claim 1, wherein the aluminum paste includes spherical or plate-shaped aluminum (Al) powder,
A coating agent for automobile interior materials, characterized in that the aluminum powder has an average size of 5 to 20㎛.
The coating agent for automobile interior materials according to claim 1, wherein the coloring agent includes at least one of a dye and a pigment.
The coating agent for automobile interior materials according to claim 1, wherein the beads include one or more of silicon beads, urethane beads, and acrylic beads.
At least a portion of the substrate contains 100 parts by weight of a first acrylic polyol resin having a glass transition temperature (Tg) of 40 to 90°C, 5 to 40 parts by weight of polyester polyol resin, 1 to 100 parts by weight of colorant, and 1 to 1 part of aluminum (Al) paste. Forming an undercoat layer by applying and curing an undercoat layer forming agent containing 30 parts by weight; and
Forming a top coat layer by applying and curing a top coat layer forming agent containing 100 parts by weight of a second acrylic polyol resin with a glass transition temperature (Tg) of 60 to 90°C and 5 to 25 parts by weight of beads on the surface of the undercoat layer. A method of forming a coating layer for an automobile interior material including;
The first acrylic polyol resin is 20 to 50% by weight of an acrylic polyol resin with a glass transition temperature (Tg): 40°C to 50°C; Glass transition temperature (Tg): 20 to 50% by weight of acrylic polyol resin exceeding 50°C and below 70°C; And a glass transition temperature (Tg): 10 to 35% by weight of an acrylic polyol resin having a glass transition temperature of more than 70°C and less than or equal to 90°C.
The second acrylic polyol resin is 40 to 60% by weight of an acrylic polyol resin having a glass transition temperature (Tg): 60°C to 70°C; And a glass transition temperature (Tg): 40 to 60% by weight of an acrylic polyol resin having a glass transition temperature (Tg) of more than 70°C and less than 90°C.
The method of claim 11, wherein the undercoat layer and the top coat layer are formed by curing the applied undercoat layer former and the top coat layer former at 70 to 100° C., respectively.
write;
Formed on at least a portion of the substrate, 100 parts by weight of a first acrylic polyol resin having a glass transition temperature (Tg) of 40 to 90°C, 5 to 40 parts by weight of polyester polyol resin, 1 to 100 parts by weight of colorant, and aluminum (Al ) Undercoat layer containing 1 to 30 parts by weight; and
A top coat layer formed on the surface of the undercoat layer, in which 5 to 25 parts by weight of beads are dispersed in a second acrylic polyol resin matrix having a glass transition temperature (Tg) of 60 to 90°C,
The first acrylic polyol resin is 20 to 50% by weight of an acrylic polyol resin with a glass transition temperature (Tg): 40°C to 50°C; Glass transition temperature (Tg): 20 to 50% by weight of acrylic polyol resin exceeding 50°C and below 70°C; And a glass transition temperature (Tg): 10 to 35% by weight of an acrylic polyol resin having a glass transition temperature of more than 70°C and less than or equal to 90°C.
The second acrylic polyol resin is 40 to 60% by weight of an acrylic polyol resin having a glass transition temperature (Tg): 60°C to 70°C; And a glass transition temperature (Tg): 40 to 60% by weight of an acrylic polyol resin having a glass transition temperature of more than 70°C and less than or equal to 90°C;
An automobile interior material, characterized in that one or more irregularities are formed on the surface of the top coat layer.
The automobile interior material according to claim 13, wherein the height of the irregularities is 0.3 to 20㎛ and the longitudinal cross-section is hemispherical or semi-elliptical.
The automobile interior material of claim 13, wherein the undercoat layer has a thickness of 3 to 15 ㎛, and the top coat layer has a thickness of 20 to 35 ㎛.