KR20180101031A - High gloss coating compoition and films made therefrom - Google Patents

Abstract

The present invention provides a high gloss coating composition including an urethane acrylate resin, a silicone acrylate resin, a polyfunctional acrylate monomer, and a light-stable inorganic particle. In addition, the present invention provides a high gloss coating film including a photo-curable material of the high gloss coating composition. Therefore, the high gloss coating composition has an effect of absorbing or scattering ultraviolet rays.

Description

TECHNICAL FIELD [0001] The present invention relates to a high gloss coating composition and a film using the same. BACKGROUND ART [0002]

High-gloss coating compositions and films using the same.

Generally, furniture and interior finishing materials or interior materials of buildings are generally manufactured by UV curing using a photo-curable resin for high-gloss products having improved transparency and scratch resistance.

Specifically, a high glossy decorative board is coated with a UV paint to give a high gloss. Another method is to bond a high-gloss transfer sheet to a board.

Among these methods, a method of coating a high gloss ultraviolet (UV) curing type coating material with a high gloss is a method of applying a high-gloss UV curing type coating material to the board surface and curing the coating with a UV lamp. However, when a UV curable coating material is exposed to ultraviolet rays by the residue of a coating composition, discoloration may occur with time.

Therefore, there is a need for research on a method capable of maintaining high gloss without discoloring even when exposed to ultraviolet rays.

One embodiment of the present invention provides a high-gloss coating composition having an effect of absorbing or scattering ultraviolet light.

Another embodiment of the present invention provides a high-gloss coating film having improved light resistance and hardness while maintaining excellent high gloss.

In one embodiment of the present invention, there is provided a high-gloss coating composition comprising a urethane acrylate resin, a silicone acrylate resin, a polyfunctional acrylate monomer and a light-stable inorganic particle.

In another embodiment of the present invention, there is provided a high-gloss coating film comprising a photo-cured product of the high-gloss coating composition.

The high-gloss coating film using the high-gloss coating composition can simultaneously realize an effect of improving light resistance and surface hardness while maintaining excellent high gloss.

The high-gloss coating composition may include light-stable inorganic particles to achieve improved hardness.

In addition, by controlling the particle size and shape of the light-stable inorganic particles contained in the high-gloss coating composition, the high-gloss coating film is not discolored even when exposed to ultraviolet rays, and an organic light stabilizer is not included, High gloss and transparency can be realized.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art to which the invention pertains. Only. Like reference numerals refer to like elements throughout the specification.

In the drawings, the thicknesses are enlarged to clearly indicate layers and regions. In the drawings, for the convenience of explanation, the thicknesses of some layers and regions are exaggerated.

It will also be understood that when a layer, film, region, plate, or the like is referred to as being "on" or "over" another portion, . Conversely, when a part is "directly over" another part, it means that there is no other part in the middle. In addition, when a layer, film, region, plate, or the like is referred to as being "under" or "under" another portion, . Conversely, when a part is "directly underneath" another part, it means that there is no other part in the middle.

In one embodiment of the present invention, there is provided a high-gloss coating composition comprising a urethane acrylate resin, a silicone acrylate resin, a polyfunctional acrylate monomer and a light-stable inorganic particle.

Through the high-gloss coating composition, an advantage of securing a high gloss as well as an improved light resistance and hardness can be obtained in the case of a high-gloss coating film to which the high gloss coating film is applied. The high-gloss coating composition contains light-stable inorganic particles and can maximize the above-mentioned advantages by controlling the shape, particle size and content of the light-stable inorganic particles.

The urethane acrylate resin is a photo-curing resin, a generic term of a mixture having an urethane bond and an acrylate group, and the urethane bond includes a hard segment based on an isocyanate compound and a soft segment based on a polyol compound .

The hard segment based on the isocyanate compound induces cohesion and crystallization between molecules by hydrogen bonding to impart toughness to the high-gloss coating composition. For example, the hydrogen bonds between the hard segments are not completely bonded to each other but are broken when an external force such as tensile is applied from the outside, so that they can freely flocculate and crystallize with other hard segments, It is possible to impart flexibility and toughness to the formed high-gloss coating film

As described above, the high-gloss coating composition contains the urethane acrylate resin, so that an appropriate hardness can be maintained at the time of photo-curing and the moldability can be improved.

The urethane acrylate resin may have a weight-average molecular weight (Mw) of about 4,000 to about 8,000.

The urethane acrylate resin has a weight average molecular weight in the above range, thereby improving hardness and durability.

When the weight average molecular weight is less than the above range, curling due to the uneven shrinkage ratio during curing of the high-gloss coating composition may be intensified. If the weight average molecular weight is above this range, the viscosity may be too high, May occur.

The urethane acrylate resin may comprise from about 10% to about 20% by weight. If the urethane acrylate resin is in the above range, there may arise a problem that the workability is lowered, and when the urethane acrylate resin is in the above range, scratch resistance may be reduced.

For example, the silicone acrylate resin has a silicon chemical structure at a certain end of functional groups included in the silicone acrylate resin, and has photo-curability, and imparts slip property and stain resistance to the high-gloss coating composition at the same time Can play a role.

The silicone acrylate resin may have a weight-average molecular weight (Mw) of about 50,000 to about 100,000. The silicon acrylate resin has a weight average molecular weight in the range described above, thereby improving the slip property, and it is easy to apply the high-gloss coating composition to the adherend and the stain resistance can be improved, so that high gloss can be maintained upon photo- curing.

If the weight average molecular weight is less than the above range, the degree of purity may be decreased due to an increase in the number of side products not participating in the reaction. If the weight average molecular weight is more than the above range, silicone properties may not be exhibited due to entanglement of the silicone acrylate resin .

The silicone acrylate resin may comprise from about 10% to about 20% by weight.

If the amount of the silicone acrylate resin is less than the above range, there may arise a problem that stain resistance and abrasion resistance are lowered. If the silicone acrylate resin is in the above range, a yellowing problem may occur in the appearance color of the high-

By using the urethane acrylate resin and the silicone acrylate resin in combination, the high-gloss coating composition can realize the above-mentioned hardness, durability, stain resistance and slipperiness simultaneously.

When the high-gloss coating composition contains only the urethane acrylate resin and the silicone acrylate resin, the viscosity of the high-gloss coating composition may be excessively high and the moldability may be deteriorated. The high-gloss coating composition may contain the urethane acrylate resin and the silicone acrylate resin And a multifunctional acrylate monomer together with the polyfunctional acrylate monomer so that it can be controlled to an appropriate viscosity as well as the curing rate during photo-curing can be increased and the curling level can be easily controlled and the moldability can be improved.

The polyfunctional acrylate monomer means a monomer having two or more acrylate groups having photoreactive properties.

Specifically, the polyfunctional acrylate monomer may be a bifunctional acrylate monomer, a trifunctional acrylate monomer, a tetrafunctional acrylate monomer, a pentafunctional acrylate monomer, a hexafunctional acrylate monomer, or a combination thereof ≪ / RTI >

Examples of the bifunctional acrylate monomer include 1,6-hexanediol diacrylate, triphenylglycol diacrylate, butanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate, tetraethylene glycol diacrylate , Triethylene glycol diacrylate, polyethylene glycol diacrylate, dipropylene glycol diacrylate, ethoxylated neopentyl glycol diacrylate, and combinations thereof.

Examples of the trifunctional acrylate monomer include trimethylolpropane triacrylate, pentaerythritol triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, tri (2-hydroxyethyl ) Isocyanurate triacrylate, and combinations thereof. ≪ RTI ID = 0.0 >

The tetrafunctional acrylate monomer may include diglycerin tetra (meth) acrylate or pentaerythritol tetra (meth) acrylate, or both.

(Meth) acrylate modified with a pentafunctional acrylate monomer propionic acid, and the above-mentioned hexafunctional acrylate monomer is exemplified by dipentaerythritol hexa (meth) acrylate, caprolactone modified dipenta And hexafunctional acrylates such as uretolitol hexa (meth) acrylate or urethane (meth) acrylate (e.g., a reaction product of an isocyanate monomer and trimethylolpropane tri (meth) acrylate).

The polyfunctional acrylate monomer may be included in an amount of about 60 wt% to about 75 wt%.

If the polyfunctional acrylate monomer is in the above range, the viscosity of the high-gloss coating composition may be too high to cause a problem in the coating process, and if the polyfunctional acrylate monomer is in the above range, the physical properties of the coating may deteriorate .

Conventionally, conventional ultraviolet curable compositions may be accompanied by discoloration as the unreacted residue remains after curing and the exposure time to ultraviolet light increases. Therefore, it includes an organic photostabilizer such as a UV absorber (UVA), a Hindered Amine Light Stabilizer (HALS), etc. to prevent discoloration. However, when an organic photostabilizer is included in this manner, the curing rate during the process can be lowered and the physical properties such as hardness may be lowered.

In one embodiment, the high-gloss coating composition may not include an organic photostabilizer, thereby not deteriorating physical properties such as hardening rate and hardness, and may be capable of realizing high gloss together with the light- Can be realized.

The light-stable inorganic particles may include, for example, one selected from the group consisting of titanium dioxide (TiO ₂ ), zinc oxide (ZnO), zirconium dioxide (ZrO ₂ ), and combinations thereof.

The light stability refers to a property that the photo-cured product of the high-gloss coating composition maintains a high gloss for a long period of time even when exposed to light, and is highly resistant to changes in properties due to light such as no discoloration. In addition, the light-stable inorganic particles satisfy the optical characteristics capable of absorbing or scattering light.

The high-gloss coating composition can be excellent in both hardness and gloss properties and discoloration prevention performance by including the light-stable inorganic particles without containing an organic light stabilizer.

The light-stable inorganic particles may have a spherical shape. The spherical shape does not mean that the diameter of the cross section is geometrically uniform but can be understood to refer to a three-dimensional shape recognizable as a spherical shape.

If the light-stable inorganic particles are not spherical but have a plate-like shape, they may cause irregular reflection and degrade the gloss.

Accordingly, one embodiment of the present invention can simultaneously realize high gloss and light resistance by using spherical light-stable inorganic particles as described above.

The light-stable inorganic particles may have a particle diameter of about 1 nm to about 50 nm. The particle size of the light-stable inorganic particles means the diameter of the particle cross section and can be measured by a transmission electron microscope (TEM) and a scanning electron microscope (SEM).

By having the light-stable inorganic particles have the above-mentioned particle size, excellent transparency and excellent light resistance can be realized. When the diameter of the light-stable inorganic particles is less than the above range, the light resistance may be lowered, and when the diameter is larger than the above range, the transparency may be lowered.

The amount of the light-stable inorganic particles contained in the high-gloss coating composition may be, for example, from about 0.5 wt% to about 2 wt%, and specifically, greater than about 0.5 wt% to about 2 wt% For example, from about 0.6% to about 1% by weight. By including the light-stable inorganic particles in the above-mentioned content range, light fastness and excellent hardness can be secured. When the light-stable inorganic particles are contained in an amount less than the content range, the light resistance and hardness may be lowered. When the light-stable inorganic particles are contained in an amount exceeding the above range, transparency is lowered, It can cause bad appearance.

The high-gloss coating composition may further include at least one selected from the group consisting of a photoinitiator, a surface wetting agent, a dispersant, an antifoaming agent, and combinations thereof.

The photoinitiator may serve to induce photo-curing. The type of photoinitiator is not particularly limited, and examples thereof include alpha-hydroxy ketone initiator, phenylglyoxylate initiator, benzyldimethyl- An initiator of aminoketones, a monoacylphosphine initiator, a bisacylphosphine initiator, a phosphine oxide initiator, a metallocene initiator, an iodonium salt initiator, and combinations thereof.

The surface wetting agent maintains an appropriate surface flatness, thereby preventing cracks of the high-gloss coating film and improving durability.

The surface wetting agent may include a silicone-based polymer, a non-silicone-based polymer, or both of them. Specifically, when the silicone-based polymer is included, the surface wetting agent may have a good slipperiness and excellent abrasion resistance by appropriately adjusting the surface energy.

The silicone-based polymer may include, for example, an organopolysiloxane resin as a polymer containing silicon among the types of polymers used as the surface wetting agent, and the organopolysiloxane resin may include, for example, an alkyl group having 1 to 3 carbon atoms , An epoxy group having 2 to 3 carbon atoms, a hydroxyl group, a vinyl group, and a combination thereof.

The non-silicone-based polymer is a non-silicone-containing polymer among polymer classes used as a surface wetting agent, for example, polyvinylpyrrolidone (PVP), alkoxylated acetylenic diol polymer, or All of which may be included and specifically include ethoxylated acetylenic diol polymers.

The surface wetting agent may comprise, for example, from about 0.5% to about 2% by weight. By including it in the content within the above range, excellent durability can be realized for a long period of time.

Another embodiment of the present invention provides a high-gloss coating film comprising a photo-cured product of the high-gloss coating composition.

The high-gloss coating film may include a cured product obtained by photo-curing the high-gloss coating composition at a light irradiation dose of about 300 J / cm 2 to about 1000 J / cm 2.

If the light irradiation amount is less than the above range, there may arise a problem that the high-gloss coating film is not cured. If the light irradiation amount is more than the above range, yellowing and heat wrinkling due to curing heat may occur.

The curing degree of the high-gloss coating film may be about 85% to about 98%. When the cured degree of the completely cured product satisfies the above range, excellent durability, transparency and high gloss effect can be realized.

The 'degree of curing' refers to a value obtained by measuring the ratio of the weight of the adhesive film remaining after dipping compared to the initial weight of the adhesive film before immersion in the solution, and after drying after leaving a certain amount of the adhesive film for 24 hours after immersing the solution , Which can be a measure for evaluating the ductility of the coating film

The high-gloss coating film may have a thickness of about 1 [mu] m to about 20 [mu] m. If the thickness of the high-gloss coating film is less than the above-mentioned range, there may arise a problem that the surface uniformity is lowered. If the thickness of the high-gloss coating film is more than the above range, curling may occur at both sides of the high- have.

The high-gloss coating film may have a gloss of from about 90 to about 95. [ The gloss of the high-gloss coating film can be measured by, for example, a measurement method according to ASTM D523. By maintaining the gloss of the high-gloss coating film within the above range, it is possible to realize a high-gloss performance of a required level, and it is possible to obtain an advantage of maintaining a high gloss for a long period of time.

Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto.

< Example  And Comparative Example >

Example  One

15% by weight of a urethane acrylate resin having a weight average molecular weight of 5,000 (LG Hausys, polymer resin), 15% by weight of a silicone acrylate resin having a weight average molecular weight of 70000 (LG Hausys, polymer resin) , 30 wt% of a monomer (pentaerythritol triacrylate), 33 wt% of a 1,6 hexadiol diacrylate, 5 wt% of a photo-initiator (Irgacure 184), 1 wt% of a silicone surface wetting agent (BYK3570) A high-gloss coating composition containing 1% by weight of inorganic particles was prepared.

The light-stable inorganic particles are spherical particles mixed with various sizes ranging from 1 nm to 50 nm in diameter, and zirconium dioxide (ZrO ₂ ) was used.

The high-gloss coating composition was coated on a substrate layer of polyethylene terephthalate (PET) having a thickness of 250 탆 and then photocured at a light irradiation dose of 300 mJ / cm 2 to 500 mJ / cm 2 to prepare a high-gloss coating film having a thickness of 15 탆.

Example  2

A high-gloss coating composition and a high-gloss film were prepared in the same manner as in Example 1, except that 33.4% by weight of the bifunctional acrylate monomer (1,6 hexanediol diacrylate) and 0.6% by weight of the light-stable inorganic particles were contained.

Example  3

A high-gloss coating composition and a high-gloss film similar to those of Example 1 were prepared, except that the bifunctional acrylate monomer (1,6 hexanediol diacrylate) was contained in an amount of 33.75 wt% and the light-stable inorganic particles in an amount of 0.25 wt%.

Comparative Example  One

15% by weight of a urethane acrylate resin having a weight average molecular weight of 5,000 (LG Hausys, polymer resin), 15% by weight of a silicone acrylate resin having a weight average molecular weight of 70000 (LG Hausys, polymer resin) , 30% by weight of a monomer (pentaerythritol triacrylate), 34% by weight of bifunctional acrylate monomer, 5% by weight of a photo initiator (Irgacure 184) and 1% by weight of a silicone based surface wetting agent (BYK3570) Coating composition.

The high-gloss coating composition was coated on a substrate layer of polyethylene terephthalate (PET) having a thickness of 250 탆 and then photocured at a light irradiation dose of 300 mJ / cm 2 to 500 mJ / cm 2 to prepare a high-gloss coating film having a thickness of 15 탆.

Comparative Example  2

15% by weight of a urethane acrylate resin having a weight average molecular weight of 5,000 (LG Hausys, polymer resin), 15% by weight of a silicone acrylate resin having a weight average molecular weight of 70000 (LG Hausys, polymer resin) , 30 wt% of a monomer (pentaerythritol triacrylate), 33 wt% of a bifunctional acrylate monomer, 5 wt% of a photo initiator (Irgacure 184), 1 wt% of a silicone surface wetting agent (BYK3570) 0.5% by weight of a triazole based light stabilizer (BYK, Tinuvin 1130) and 0.5% by weight of an amine light stabilizer (BYK, Tinuvin 123).

The high-gloss coating composition was coated on a substrate layer of polyethylene terephthalate (PET) having a thickness of 250 탆 and then photocured at a light irradiation dose of 300 mJ / cm 2 to 500 mJ / cm 2 to prepare a high-gloss coating film having a thickness of 15 탆.

Comparative Example  3

15% by weight of a urethane acrylate resin having a weight average molecular weight of 5,000 (LG Hausys, polymer resin), 15% by weight of a silicone acrylate resin having a weight average molecular weight of 70000 (LG Hausys, polymer resin) , 30 wt% of a monomer (pentaerythritol triacrylate), 33 wt% of a bifunctional acrylate monomer, 5 wt% of a photo initiator (Irgacure 184), 1 wt% of a surface wetting agent (BYK3570) A high-gloss coating composition comprising 1% by weight of a luminescent light stabilizer (BYK, Tinuvin 1130) was prepared.

The high-gloss coating composition was coated on a substrate layer of polyethylene terephthalate (PET) having a thickness of 250 탆 and then cured at a dose of 300 mJ / cm 2 to 500 mJ / cm 2 to prepare a high-gloss coating film having a thickness of 15 탆.

Comparative Example  4

15% by weight of a urethane acrylate resin having a weight average molecular weight of 5,000 (LG Hausys, polymer resin), 15% by weight of a silicone acrylate resin having a weight average molecular weight of 70000 (LG Hausys, polymer resin) , 30 wt% of a monomer (pentaerythritol triacrylate), 33 wt% of a bifunctional acrylate monomer, 5 wt% of a photo-initiator (Irgacure 184), 1 wt% of a surface wetting agent (BYK3570) A high-gloss coating composition comprising 1 wt% of a light stabilizer (Tinuvin 123) was prepared.

The high-gloss coating composition was coated on a substrate layer of polyethylene terephthalate (PET) having a thickness of 250 탆 and then photocured at a light irradiation dose of 300 mJ / cm 2 to 500 mJ / cm 2 to prepare a high-gloss coating film having a thickness of 15 탆.

<Evaluation>

Experimental Example  One: Light resistance  Measure

LZ-UVC-H502-CMD (H), 351 nm) was irradiated to each of the high-gloss coating films according to Examples 1-4 and Comparative Examples 1-4 under a condition of 50 占 폚, UV irradiation was performed for 50 hours, 100 hours, 200 hours, 300 hours, and 400 hours at an irradiation dose of 0.8 W / mq using a spectrophotometer (KONICA MINOLTA, model name VTLCM-700) The color index change value, ΔE = (ΔL ² + Δa ² + Δb ² ) ^1/2, was measured and reported in Table 1 below.

Specifically, ΔL is the amount of change in brightness, Δa is the amount of green / red change, and Δb is the amount of change in blue / yellow. It can be seen that the smaller the ΔE value, the better the light resistance is realized.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 50h 0.68 0.68 0.7 0.85 1.04 1.06 0.91 100h 0.87 0.84 0.91 1.03 1.06 1.13 1.03 200h 1.25 1.27 1.37 1.46 1.19 1.28 1.53 300h 1.53 1.56 1.71 1.82 1.31 1.5 1.92 400h 1.90 1.99 2.17 2.31 1.96 2.02 2.26

Experimental Example  2: Scratch resistance  Measure

Measurement methods: The high gloss coating films according to the examples and the comparative examples were measured according to EN 14323, Newton test (Erichsen scratch tester, Diamond tip), and the results are shown in Table 2 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Scratch resistance 1.2N 1.2N 1.02N 0.9N 1.0 N 0.8N 0.9N

Experimental Example  3: Heat resistance measurement

Measuring method: 1000 g of aluminum weight was heated to 100 캜 according to DIN EN12722, placed on each high-gloss coating film according to Example 1 and Comparative Example 1-4, left for 20 minutes, Respectively.

Next, with respect to each of the high-gloss films, whether or not the aluminum was removed with the naked eye was observed to evaluate the heat resistance, and the results are shown in Table 2 below.

Specifically, according to the shape of the weight, the mark is evaluated as excellent if the mark is not visible, and evaluated as inferior the more marks are left.

Experimental Example  4: Measurement of stain resistance

Measuring method: Two to three drops of each of the nampen, ink, wine, coffee and mustard contaminants were dropped on each of the high-gloss coating films according to Example 1 and Comparative Example 1-4, and then left for 16 hours at room temperature , And then the contaminants were wiped off with a cloth with water and alcohol, and the surface was observed with the naked eye.

As a result, the contaminants were evaluated as inferior according to the degree of remained or coloring of the contaminants on the respective high-gloss coating films, and the degree of residual and coloring of the contaminants was evaluated as inferior. The numbers 1 to 5 are shown in Table 3 below. (1: high residue or coloration of the contaminant, 5: clear the contaminant)

Experimental Example  5: Abrasion resistance measurement

Measuring method: For each of the high gloss coating films according to Example 1 and Comparative Example 1-4, initial gloss (G ₁ ) was measured using a gloss meter (BYK, AG4446) The surface of the high-gloss coating film was rubbed 10 times at a pressure of 6 N using Steel wool # 0000, and the glossiness (G ₂ ) was measured using the gloss meter.

If the value obtained by subtracting the electrical gloss (G ₁ ) from the late gloss (G ₂ ) is less than 20, it is evaluated as 'excellent'. If it is more than 20, Described in Table 3 below.

Experimental Example  6: Color matching  Measure

Measuring method: A white cloth made of PETG (glycol-modified polyethylene terephthalate) was prepared, and the high-gloss coating composition prepared in each of Example 1 and Comparative Example 1-4 was applied on the fabric and photocured to obtain a high- . The color difference (dE) of the film before and after the application of the high-gloss coating composition was measured using a measuring device (Konica minolta, CM5), and when the color difference dE was less than 0.3, , And the case of 'excellent', exceeding 0.5 and less than 0.6 is evaluated as 'normal', and is shown in Table 3 below.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Heat resistance usually usually usually usually usually usually usually Stain resistance 4 4 3 3 3 3 3 Abrasion resistance Great Great Great Great usually usually usually Color matching Very good Great usually Great usually usually usually

Experimental Example  6: Measurement of hardness

Each of the high gloss coating films according to Examples 1-4 and Comparative Example 1-4 was cut into a size of 5 mm × 5 mm × 5 mm to prepare respective specimens, and then the weight was measured before immersing the specimens in the solvent to obtain the initial mass.

Then, each of the specimens was immersed in an ethyl acetate solvent, allowed to stand at room temperature for 24 hours, filtered using a 200-mesh wire mesh, and dried at 110 ° C. for 2 hours to measure the mass (dry mass) To obtain a later mass.

The initial mass was defined as W _i , and the latter mass was defined as W _f . The degree of cure was calculated by the following equation 1.

[Equation 1]

Hardening degree (%) = {1 - (Wi - Wf) / Wi} x 100

Experimental Example  7: Surface hardness measurement

The surface hardness of each of the high-gloss coating films according to Examples 1-4 and Comparative Examples 1-4 was measured by a measuring method according to 1-4 JISK5600-5-4. The pencil hardness standard was based on a Mitsubishi pencil: rated according to an electric 1 kg load reference 6B to 9H (grade 17). Specifically, 6B-5B- ... -2B-B-HB-FH-2H- 8H-9H, and the hardness is lower toward 6B and higher toward 9H. In this case, F is subdivided into F- and F + grades. F + corresponds to the case where H is not satisfied but almost no scratch is observed, F- corresponds to a case where hardness is higher than HB but F is not completely satisfied .

Example
One Example
2 Example
3 Example
4 Comparative Example
One Comparative Example
2 Comparative Example
3 Comparative Example
4 Hardness (%) 92 92 92 92 92 90 90 90 Surface hardness F + F + F- HB HB HB HB HB

Claims (12)

Urethane acrylate resins, silicone acrylate resins, polyfunctional acrylate monomers and light-stable inorganic particles
High gloss coating composition.
The method according to claim 1,
The urethane acrylate resin has a weight-average molecular weight (Mw) of 4,000 to 8,000
High gloss coating composition.
The method according to claim 1,
The silicone acrylate resin has a weight-average molecular weight (Mw) of 50,000 to 100,000
High gloss coating composition.
The method according to claim 1,
The polyfunctional acrylate monomers may be selected from the group consisting of bifunctional acrylate monomers, trifunctional acrylate monomers, tetrafunctional acrylate monomers, pentafunctional acrylate monomers, hexafunctional acrylate monomers, Containing the selected one
High gloss coating composition.
The method according to claim 1,
The light-stable inorganic particles are spherical
High gloss coating composition.
The method according to claim 1,
The light-stable inorganic particles may have particle diameters of 1 nm to 50 nm
High gloss coating composition.
The method according to claim 1,
Wherein the content of the light-stable inorganic particles is 0.5 wt% to 2 wt%
High gloss coating composition.
The method according to claim 1,
The photostability inorganic particles are titanium dioxide (TiO _2), zinc (ZnO), zirconium dioxide (ZrO ₂₎ and including one selected from the group consisting of oxidation
High gloss coating composition.
The method according to claim 1,
Further comprising one selected from the group consisting of photoinitiators, surface wetting agents, dispersants, defoamers, and combinations thereof
High gloss coating composition.
A coating composition comprising a photo-cured product of the high-gloss coating composition according to any one of claims 1 to 9
High gloss coating film.
11. The method of claim 10,
And having a thickness of 1 탆 to 20 탆
High gloss coating film.
11. The method of claim 10,
A gloss measured according to ASTM D523 of 90 to 95
High gloss coating film.