KR102529937B1 - Paint for preventing adhesion, graffiti, mold on the surface of buildings - Google Patents

Abstract

Disclosed in the present specification is an anti-fouling paint composition comprising a top coat composition which includes: one or more of base resin containing polysiloxane, epoxy silane, ceramic beads, and glass beads; one or more of polyamide-based wax and polyethylene-based wax; and a solvent.

Description

Paint for preventing adhesion, graffiti, mold on the surface of buildings}

Description of an antifouling coating composition comprising a base resin including polysiloxane, an epoxy silane, at least one of ceramic beads and glass beads, a top coating composition comprising at least one of polyamide wax and polyethylene wax, and a solvent do.

The outer wall of a building, the surface of a structure such as a telephone pole is a part exposed to the external environment, and serves as a barrier to the external environment, and has an important effect on aesthetics. Attachment of advertisements or graffiti to the surface of such a structure not only deteriorates the appearance, but also has a problem of surface damage accompanying the attachment of additional contaminants due to the adhesive or the removal of the attachment. In addition, the surface of the structure needs to have resistance to the external environment, such as moisture or friction of external substances, in order to protect the structure from the outside.

To protect the surface of such a structure, a coating composition for coating applied on the surface of the structure is used.

Conventionally, a composition using silazane and a platinum catalyst in a polysiloxane-based resin has been developed, but the platinum catalyst promotes crosslinking and curing, causing problems in storage stability of the composition, and the hardness of the formed coating film is weak, resulting in scratches due to daily use. There was a problem that the coating film was damaged by physical force.

Therefore, it is excellent in releasability by lowering the adhesion of advertisements, etc. to the surface, prevents the adhesion of graffiti or external contaminants, and can protect the surface of structures where contaminants can be easily removed, while improving storage stability and hardness. There is a need for paint compositions.

The background art of the present invention is disclosed in Korean Patent Registration No. 10-1909523.

The problem to be solved by the present invention is to provide a paint composition with excellent release property and excellent anti-adhesive effect on the surface of the structure.

Another problem to be solved by the present invention is to provide a coating composition with excellent storage stability and excellent storage stability over time and stability under harsh conditions.

Another problem to be solved by the present invention is to provide a coating composition having resistance to external physical forces due to excellent scratch resistance and hardness.

Another problem to be solved by the present invention is to provide a coating composition capable of preventing problems such as external moisture and mold due to excellent hydrophobicity and water repellency.

Another problem to be solved by the present invention is to provide a coating composition having excellent antibacterial properties.

Another problem to be solved by the present invention is to provide a coating composition with excellent barrier properties such as antifouling and chemical resistance.

One aspect of the present invention is an antifouling coating composition comprising a top coating composition, wherein the top coating composition comprises at least one of a base resin, an epoxy silane, ceramic beads and glass beads, and at least one of polyamide-based wax and polyethylene-based wax , And it relates to a paint composition for antifouling comprising a solvent.

The paint composition of the present invention has excellent release properties and thus has an excellent anti-adhesive effect on the surface of structures.

The coating composition of the present invention is excellent in storage stability over time and stability under harsh conditions such as high temperature.

The coating composition of the present invention has excellent scratch resistance and hardness and thus has resistance to external physical forces.

The coating composition of the present invention has excellent hydrophobicity and water repellency, and thus has excellent resistance to external moisture.

The coating composition of the present invention has excellent resistance to moisture and antibacterial properties, so that mold and the like on the surface of the structure can be prevented.

The coating composition of the present invention is excellent in antifouling property, chemical resistance, etc., and can provide excellent barrier properties.

1 is a photograph showing a contact angle measurement method for measuring water repellency.
2 is a diagram showing the degree of water repellency according to the contact angle.

Hereinafter, specific examples of the present application will be described in more detail. However, the technology disclosed in this application is not limited to the specific examples described herein and may be embodied in other forms. However, the specific examples introduced herein are provided so that the disclosed content can be thorough and complete and the spirit of the present application can be sufficiently conveyed to those skilled in the art. In addition, those skilled in the art will be able to implement the spirit of the present application in various other forms without departing from the technical spirit of the present application.

In the present specification, when a part "includes" a certain component, it means that it does not exclude other components and may further include other components unless otherwise stated.

In this specification, "A and/or B" means A or B, or A and B.

In this specification, "upper" and "lower" are defined based on the drawings, and depending on the perspective, "upper" may be changed to "lower" and "lower" to "upper", and "on" or What is referred to as "on" may include not only immediately above but also a case where another structure is intervened in the middle. On the other hand, what is referred to as "directly on" or "directly on" indicates that no other structure is intervened.

In the present specification, "(meth)acryl" may mean acryl and/or methacryl.

In this specification, "coating film" may mean a coating layer formed by the coating composition according to the present invention.

In the present specification, "undercoating layer" may mean a coating film formed by the undercoating composition of the present invention.

In the present specification, "top coat layer" may mean a coating film formed by the top coat composition of the present invention.

In this specification, "adhesion" may mean adhesion between a coating film formed by the coating composition according to the present invention and an external attachment such as an advertisement leaflet attached to the coating film.

In the present specification, “releasability” may refer to a property of easily separating, ie, releasing, an external attachment attached to a coating film formed by the coating composition according to the present invention without damaging the coating film.

In one embodiment, the present invention provides an antifouling coating composition comprising a top coating coating composition. The antifouling coating composition may form a coating layer that protects the surface of a structure or the like from external attachments or contaminants.

In one embodiment, the antifouling coating composition includes a top coating composition, and the top coating composition may include a base resin, epoxy silane, 2-butanone oxime, beads, wax, and a solvent.

The top coat composition may be applied on top of the primer layer to form an anti-adhesion layer.

In one embodiment, the base resin may include polysiloxane. The base resin may include polyorganosiloxane and polyhydrogensiloxane.

The polyorganosiloxane may have an unsaturated bond and may be branched or linear. The polyorganosiloxane is selected from a phenyl group and a C1-18, preferably a C1-6 alkyl group as an organic group. For example, 90 mol% or more of the organic group bonded to Si may be a methyl group, but is not limited thereto. The polyorganosiloxane may have an alkenyl group as a functional group, and the alkenyl group may be a vinyl group, a hexenyl group, an acryl group, or a mixed functional group thereof.

The polyorganosiloxane may have a weight average molecular weight (Mw) of 10,000 to 1,000,000. The polyorganosiloxane has 2 to 1,000 siloxane units (-OSi(R) ₂ -), preferably 10 to 200, but is not limited thereto.

In one embodiment, the polyorganosiloxane may be polydimethylsiloxane, but is not limited thereto.

The polyhydrogensiloxane is a polysiloxane having a silicon hydride group, and may be crosslinked with the polyorganosiloxane, and the crosslinking may be performed by a reaction selected from the group consisting of a condensation reaction system, an addition reaction system, and an ultraviolet ray and electronic curing system. there is. The polyhydrogensiloxane may include 0.01 to 10 mol% of silicon hydride (Si-H) units. Within the above range, curing properties may be good, and releasability and hydrophobicity may be excellent.

In one embodiment, the polyhydrogensiloxane may be polymethylhydrogensiloxane, but is not limited thereto.

The polyorganosiloxane and polymethylhydrogensiloxane may be included in a weight ratio of 1000:1 to 10:1, for example, 200:1 to 15:1, but is not limited thereto. Within the above range, the reaction between the alkenyl group of the polyorganosiloxane and the silicon hydride group of the polyhydrogensiloxane is advantageously formed, and the release property may be excellent by minimizing residual reactive groups.

The base resin may be included in an amount of 75 to 90% by weight based on the total weight of the top coating composition. For example, the base resin may be included in an amount of 75 wt% or more, 80 wt% or more, or 85 wt% or more and 90 wt% or less, 85 wt% or less, or 80 wt% or less based on the total weight of the top coating composition.

In one embodiment, the epoxy silane may be gamma-glycidoxypropyl trialkoxysilane or gamma-glycidoxypropyl methyldialkoxysilane, such as gamma-glycidoxypropyl trimethoxysilane, gamma-glycidoxy propyl triethoxysilane, gamma-glycidoxypropyl methyldimethoxysilane and gamma-glycidoxypropyl methyldiethoxysilane. For example, Silquest® A-187 (GE silicons) may be used, but is not limited thereto.

The epoxy silane compound may be included in an amount of 0.01 to 0.5% by weight based on the total weight of the top coat composition, for example, 0.01% by weight or more, 0.05% by weight or more, 0.1% by weight or more, 0.2% by weight or more, or 0.3% by weight or more, and 0.5% by weight or less, 0.4% by weight or less, 0.3% by weight or less, or 0.2% by weight or less. It is possible to provide excellent bonding strength with the undercoating layer without yellowing within the above range, and it is possible to prevent moisture penetration through excellent hydrophobicity, thereby reducing surface corrosion problems.

In one embodiment, 2-butanone oxime is also referred to as methyl ethyl ketoxime, MEK OXIME, or MEKO, and can improve storage stability by reducing the reactivity of the base resin.

The 2-butanone oxime may be included in 0.1 to 1.0% by weight based on the total weight of the top coating composition, for example, 0.1% by weight or more, 0.2% by weight or more, 0.3% by weight or more, or 0.4% by weight or more and 1.0% by weight. or less, 0.9 wt% or less, 0.8 wt% or less, 0.7 wt% or less, 0.6 wt% or less, 0.5 wt% or less, or 0.4 wt% or less. The storage stability is excellent within the above range, and the composition can be stably stored for a long time.

In one embodiment, the beads may be one or more of ceramic beads and glass beads. The beads may be spherical and have an average particle diameter of 3 to 13 μm. The beads can improve the hardness of the coating film and improve release properties that prevent adhesion of external substances. In addition, it is possible to provide a composition having excellent water repellency and hydrophobicity and excellent storage stability, including the beads. The composition using a platinum-based catalyst according to the prior art promoted crosslinking and curing by using the platinum-based catalyst for the hardness of the coating film, but this caused a problem in storage stability, as well as the hardness of the resulting coating film, as shown in the following test examples. It was also insufficient and poor. In addition, the composition according to the prior art imparted water repellency by forming a silazane film using a platinum-based catalyst, but the composition according to the present invention has excellent water repellency and hydrophobicity without using such a silazane or platinum-based catalyst. In addition, the glossiness of the coating film formed by the composition can be easily adjusted through the use of the beads. The composition of the ceramic beads and glass beads may be adjusted according to the desired glossiness. For example, the glossiness of a coating film containing only ceramic beads may be 25 to 40, and the glossiness of a coating film containing only glass beads may be 40 to 50 degrees. It is possible to adjust the desired glossiness of the coating film by adjusting the composition by combining ceramic beads and glass beads.

In the present specification, the glossiness may be a value expressed as a percentage when the reflectance is measured when the angle of incidence and the angle of light reception are 60 °, respectively, in accordance with ASTM D 523, and the glossiness of the reference surface is set as 100. For example, it can be measured using a BYK-GARDNER (Byk Gardner, micro-TRI-gloss, Cat. No. 4520) gloss meter.

As the ceramic beads, those commonly used in the art may be used. For example, the ceramic beads may be molten ceramic beads, and for example, zirconia beads, alumina beads, and the like may be used. For example, Zirblast or Zirshot may be used, but is not limited thereto. For example, the ceramic beads may be Zirblast (68% zirconia and 32% glass crystal structure, specific gravity 3.85 g/cm 3 , bulk density 2.3 kg/L, 68 to 70% ZrO ₂ , 28 to 33% SiO ₂ , and It may be a ceramic bead containing less than 10% Al ₂ O ₃ (Saint-Gobain, France), but is not limited thereto.

As the glass beads, those commonly used in the art may be used. For example, a glass bead containing 72% SiO ₂ , 1.5% Al ₂ O ₃ , 12.5% Na ₂ O , 3.3% MgO, 9.25% CaO, and 1.45% K ₂ O having a spherical shape, specific gravity of 2.5 g/cm, and Mohs hardness of 6.5. However, it is not limited thereto. The beads may be included in an amount of 1.0 to 20% by weight based on the total weight of the top coating composition. For example, the beads are 1.0% by weight or more, 1.5% by weight or more, 2.0% by weight or more, 2.5% by weight or more, 3.0% by weight or more, 3.5% by weight or more, 4.0% by weight or more, 4.5% by weight or more, 5.0% by weight or more, 5.5% or more, 6.0% or more, 6.5% or more, 7.0% or more, 7.5% or more, 8.0% or more, 8.5% or more, 9.0% or more, 9.5% or more, 10.0% or more, or 10.5% or more and 20% or less, 19.5% or less, 19.0% or less, 18.5% or less, 18.0% or less, 17.5% or less, 17.0% or less, 16.5% or less, 16.0% or less , 15.5 wt% or less, 15.0 wt% or less, 14.5 wt% or less, 14.0 wt% or less, 13.5 wt% or less, 13.0 wt% or less, 12.5 wt% or less, 12.0 wt% or less, 11.5 wt% or less, 11.0 wt% or less can Within the above range, it is possible to provide a coating film having excellent releasability, improved hardness, and excellent water repellency and hydrophobicity.

In one embodiment, the wax may be at least one of polyamide-based wax and polyethylene-based wax. The wax may have a melting point of 100 to 160° C., but is not limited thereto. The wax may be at least one selected from polyethylene wax, modified polyethylene wax, amide-modified polyethylene wax, and polyamide wax. A monoral series such as monoral 5500 (HSCHem), CERAFLOUR 988 (BYK), CERAFLOUR 991 (BYK) or CERAFLOUR 994 (BYK) may be used as the wax, but is not limited thereto. A coating film formed from a coating material including the wax may have excellent hardness and excellent releasability.

The wax may be included in an amount of 0.5 to 5.0% by weight based on the total weight of the top coating composition, for example, 0.5% by weight or more, 0.6% by weight or more, 0.7% by weight or more, 0.8% by weight or more, 0.9% by weight or more, 1.0% by weight or more. or more, 1.5% or more, 2.0% or more, or 2.5% or more and 5.0% or less, 4.5% or less, 4.0% or less, 3.5% or less, 3.0% or less, 2.5% or less, 2.0% or less % or less, 1.5 wt% or less, or 1.0 wt% or less. Hardness and releasability may be excellent within the above range.

In one embodiment, the solvent may be used without limitation as long as it is commonly used in the art to the extent that the effect of the present invention is not impaired. For example, an aromatic hydrocarbon-based solvent, an aliphatic hydrocarbon-based solvent, a ketone-based solvent, an ester-based solvent, an ether-based solvent, or an amide-based solvent may be used as the solvent. More specifically, aromatic hydrocarbon-based solvents such as benzene, toluene, xylene, trimethylbenzene, ethylbenzene, and methylethylbenzene, aliphatic hydrocarbon-based solvents such as cyclohexane, methylcyclohexane, n-pentane, n-hexane, and n-heptane Solvent, ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, methyl n-propyl ketone, methyl n-butyl ketone, cyclohexanone, methylcyclohexanone, acetylacetone, ethyl acetate, methyl Ester solvents such as acetate, butyl acetate, ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, ethylene glycol diacetate, tetrahydrofuran, 2-methyl tetrahydrofuran, ethyl ether, n-propyl ether, isopropyl Ether solvents such as ether, diglyme, dioxin, dimethyl dioxin, ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, propylene glycol monomethyl ether, and propylene glycol dimethyl ether, N-methyl pyrroly An amide-based solvent such as alcohol, formamide, N-methyl formamide, N-ethyl formamide, N,N-dimethyl acetamide, or N,N-diethyl acetamide may be used, but is not limited thereto.

The solvent may be used as the remaining component of the top coat composition. For example, the solvent may be used in an amount of 5% to 15% by weight based on the total weight of the top coating composition, but is not limited thereto. The viscosity is appropriate within the above range, and workability may be excellent.

In one embodiment, the top coat composition may include, as other additives, an antibacterial agent, an antiseptic agent, a thickener, a dispersing agent, an antifoaming agent, a plasticizer, an antibacterial agent, a UV absorber, an absorbent, a foaming agent, a carbonizing agent, a pigment, a matting agent, an antisettling agent, an antioxidant, and a leveling agent. etc. may be additionally included. The content of the additive may be 0.5 wt % to 1.0 wt % based on the total weight of the top coating composition, but is not limited thereto.

The top coat composition may have a viscosity of 50 to 600 cps at 25° C., but is not limited thereto. Workability is excellent in the above range, and curing characteristics may be appropriate.

The top coat composition forms a top coat layer applied on the surface of a structure to be protected, that is, an undercoat layer formed on a substrate, and may be coated as an antifouling layer or an antiadhesive layer.

The undercoating layer is a primer layer, and may be formed according to a conventional method in the art, for example, including coating and drying an undercoating composition on a substrate. The undercoat layer improves bonding strength and adhesive strength between the base material and the top coat layer, and may be used to reinforce irregularities or strength of the surface of the base material, increase the adhesion area of a porous surface, or improve waterproofness.

In one embodiment, the antifouling paint composition may further include an undercoating paint composition.

The undercoating composition may include an acrylic resin and a solvent.

In one embodiment, the acrylic resin may be used without limitation as long as it is commonly used in the art. For example, the acrylic resin may be a polymer of a (meth)acrylate monomer or a modified resin of the polymer. The (meth) acrylate monomer is methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, hydroxypropyl ( meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, lauryl (meth)acrylate, 2-methoxyethyl (meth)acrylate , ethoxymethyl (meth) acrylate, and may be one or more selected from benzyl (meth) acrylate, but is not limited thereto.

The acrylic resin may be included in 80 to 90% by weight based on the total weight of the top coating composition, but is not limited thereto. Mechanical properties are excellent within the above range, and workability may be excellent because the viscosity is appropriate.

The solvent may be the same solvent as described in the top coat composition, and may include the same or different solvents used in the top coat composition.

The undercoat composition may further include additives as described in the top coat composition.

The undercoating composition may have a viscosity of 1,000 to 10,000 cps at 25° C., but is not limited thereto. Workability is excellent in the above range, and curing characteristics may be appropriate.

In one aspect, the present invention provides a method of forming an antifouling layer using an antifouling coating composition.

In one embodiment, the method may include applying and curing an antifouling coating composition on a surface of a substrate.

In one embodiment, the method may include forming an undercoating layer by applying an undercoating composition to the surface of the substrate. For example, the primer composition may be applied by brush, roller, spray, flow coating, dip coating, or rubbing with a fabric or sponge, but is not limited thereto. A step of removing foreign matter from the surface of the substrate or structure and/or smoothing the surface of the substrate or structure may be included before the application. It may include drying and/or curing after application of the composition. The drying and/or curing may be performed at room temperature for, for example, 18 to 36 hours, 20 to 26 hours, or 24 hours, but is not limited thereto.

In one embodiment, the method may include forming a top coat layer by applying a top coat composition on the undercoat layer. The application may be performed in the same manner as described with respect to forming the undercoating layer. A step of removing foreign matter from the surface of the substrate or structure and/or smoothing the surface of the substrate or structure may be included before the application. It may include drying and/or curing after application of the composition. The drying and/or curing may be performed at room temperature for, for example, 18 to 36 hours, 20 to 26 hours, or 24 hours, but is not limited thereto. Antifouling paint compositions according to embodiments of the present invention have storage stability It is possible to provide a composition with remarkably improved storage stability without using an inhibiting platinum-based catalyst. In addition, the antifouling paint composition according to embodiments of the present invention solves the problem of poor hardness of a paint film formed from a paint using a conventional platinum-based catalyst through a combination of the above-described specific composition, thereby having remarkably excellent scratch resistance and film hardness. A coating can be formed. Therefore, a coating film formed from the paint according to embodiments of the present invention, for example, a top coat layer, may have excellent coating film hardness, for example, a pencil hardness of F to 1H. In addition, the coating film formed from the paint according to the embodiments of the present invention, for example, the top coat layer, has excellent water repellency and hydrophobicity, and exhibits improved releasability to prevent adhesion of contaminants and to easily remove them.

Hereinafter, the configuration and effects of the present invention will be described in more detail by way of Examples, Comparative Examples and Test Examples. However, these Examples, Comparative Examples, and Test Examples are provided only for illustrative purposes to aid understanding of the present invention, and the scope and scope of the present invention are not limited by the following Examples, Comparative Examples, and Test Examples.

[Examples 1 to 8] Preparation of paint composition

A top coat composition having a composition according to Table 1 was prepared.

ingredient Example One 2 3 4 5 6 7 8 base resin 81.3 81.3 81.3 81.3 81.3 81.3 81.3 81.3 Epoxysilane 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 2-butanone oxime 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 ceramic bead 10 10 10 5 5 5 glass bead 10 10 5 5 5 polyamide wax One One One One 0.5 0.5 Polyethylene Wax One One 0.5 0.5 antibacterial 0.5 0.5 0.5 toluene 7.3 7.3 7.3 7.3 6.8 7.3 6.8 6.8 gun 100 100 100 100 100 100 100 100

The specific components used are as follows. (A) Base resin: 63% by weight of polydimethylsiloxane (LTC750A, Dow Corning) and 22% by weight of polymethylhydrogensiloxane (SF6000P, KCC) having a Si-H content of 15.5 mmol/g

(B) Epoxysilane: Silquest® A-187 (GE silicons)

(C) 2-Butanone oxime: methyl ethyl ketoxime (CHEMELYNE SPPECIALITIES)

(D) Ceramic beads: Zirblast (crystalline structure of 68% zirconia and 32% glass, specific gravity 3.85 g/cm 3 , bulk density 2.3 kg/L, 68 to 70% ZrO2, 28 to 33% SiO2, and 10 Ceramic beads containing less than % Al2O3, Saint-Gobain, France) Average particle diameter 8㎛

(E) Glass beads: Glass beads (K1SP Co., Ltd.), average particle diameter 8㎛

(F) polyamide-based wax: monoral 5500 (HSCHem)

(G) Polyethylene Wax: CERAFLOUR 988 (BYK)

(H) Antibacterial agent: Sanitized AG+ (Sanitized)

[Comparative Example 1] Preparation of a paint composition using a platinum-based catalyst

63% by weight of polydimethylsiloxane (LTC750A, Dow Corning), 22% by weight of polymethylhydrogensiloxane (SF6000P, KCC) having a Si-H content of 15.5 mmol/g, and polyvinylsilazane (KION HTT 1800, KION ) 4.99% by weight, 0.01% by weight of chloroplatinic acid, and 10% by weight of the solvent by mixing methyl ethyl ketone, toluene, and heptane in a weight ratio of 1: 1: 1.5 to prepare a paint composition.

[Test Example 1] Example physical property evaluation

On the concrete wall substrate, an undercoating composition containing 85% by weight of acrylic resin (Plus Resin AR-1622, Chemplus), 5% by weight of toluene, and 5% by weight of butyl acetate was applied, and cured at room temperature for 24 hours to an average thickness of 15㎛ And a lower coat layer coating with a theoretical coating rate of 25.74 m 2 / l was formed. The top coating composition according to the above embodiment was applied on the lower coating layer and cured at room temperature for 24 hours to form a top coating film having an average thickness of 15 μm and a theoretical coating rate of 29.99 m 2 / l to prepare a coating layer for antifouling to evaluate the physical properties below provided. Each physical property evaluation method is as follows.

(1) Impact resistance: According to ASTM D 2794, when a weight of 0.5 kg is dropped from a height of 50 cm (basic condition) and a weight of 1 kg is dropped from a height of 100 cm (severe condition) toward the specimen, The degree of release was measured, and if release occurred, it was marked as F, and if release did not occur, it was marked as P.

(2) Adhesion: In accordance with ASTM D 3359, after making 100 squares (10 × 10) at 2 mm intervals on the painted surface using a prescribed knife, the tape is attached to the specimen. At this time, the conditions of the dry environment are 25 ℃, the conditions of the humid environment are 38 ℃, 24 hours (basic conditions), and the harsh conditions were performed at 25 ℃ dry environment and 38 ℃ 48 hours of humid environment conditions. Next, when the tape was removed under each condition, the state of the specimen was examined, and if release occurred, it was marked as F, and if release did not occur, it was marked as P.

(3) Acid resistance: In accordance with ASTM D 1308, if surface damage (blistering) occurs by observing the surface after exposure to 10% sulfuric acid solution for 15 minutes (basic condition) and 30 minutes (severe condition), F, no occurrence Otherwise, it was written as P.

(4) Nitric acid resistance: In accordance with ASTM D 1308, after exposure to 70% nitric acid solution for 30 minutes, the surface was observed, and if surface damage occurred, it was described as F, and if it did not occur, it was marked as P.

(5) Detergent resistance: In accordance with ASTM D 2248, it was observed after exposure to 38 ° C. and 3% DET for 72 hours, and if surface damage occurred, it was described as F, and if it did not occur, it was described as P.

(6) Insulation: In accordance with IEC 60093, when the surface resistance was measured, it was described as P if it was 0.4 MΩ or more, and F if it was less than 0.4 MΩ. In the harsh conditions, when the surface resistance was measured, it was described as P if it was 0.6 MΩ or more, and F if it was less than 0.6 MΩ.

(7) Antifouling: Three elliptical wire mesh structures (ℓℓℓ, longest diameter 10 mm) were marked on the surface of the coated adherend using an oil-based name pen black (Monami), and left for 10 minutes. Then, using a medium-sized wiper (Yuhan-Kimberly), it was wiped with a load of 1 kg and visually observed according to the following criteria. As for the harsh condition, wiping of the following standard was performed with a weak force on the amygdala.

A: Completely erased in one round trip.

B: Oval traces remain faintly with one round trip.

C: Clear elliptical traces with one round trip.

D: Oval traces are not erased at all with one round trip.

(8) Gloss: The reflectance was measured using a gloss meter when the angle of incidence and the angle of light reception were 60°, respectively, according to ASTM D 523, and expressed as a percentage when the glossiness of the reference surface was set as 100.

Example Impact resistance* Adhesion* acid resistance* nitric acid resistance Detergent resistance* Insulation* antifouling* Glossiness One P/P P/P P/P P P/P P/P A/A 25 to 40 2 P/P P/P P/P P P/P P/P A/A 40 to 50 3 P/P P/P P/P P P/P P/P A/A 25 to 40 4 P/P P/P P/P P P/P P/P A/A 40 to 50 5 P/P P/P P/P P P/P P/P A/A 25 to 40 6 P/P P/P P/P P P/P P/P A/A 35 to 45 7 P/P P/P P/P P P/P P/P A/A 35 to 45 8 P/P P/P P/P P P/P P/P A/A 35 to 45

* (basic condition)/(severe condition)

From the above results, the coating layer formed of the example paint composition can form various gloss levels, has good impact resistance in basic conditions and harsh conditions, shows an effect without release due to adhesion, and has acid resistance, nitric acid resistance, resistance It was confirmed that chemical resistance such as detergent property was good, and insulation and antifouling properties were also excellent.

[Test Example 2] Comparison of storage stability

The 25 ° C viscosity of the paint compositions of Example 1 and Comparative Example 1 was measured with a stormer viscometer, stored in a steel container (STEEL) and a polyethylene container (PE) at 60 ° C, and the gelation time was measured. The result is shown next.

Example 1 Comparative Example 1 initial viscosity 68 68 Gelation time (days) STEEL 11 5 PE 8 2

From the above results, compared to the composition of Comparative Example 1 using a conventional platinum-based catalyst, the composition of Example 1 exhibited a gelation time two or more times later when stored at high temperature, confirming that the storage stability was remarkably improved.

[Test Example 3] Adhesion Comparison

In accordance with ASTM D3330, a tape was attached to the antifouling coating layer specimen prepared as in Test Example 1, and the force at which the tape was peeled off when the specimen was pulled at an angle of 180 ° and 90 °, respectively, was measured. In the specimen of Comparative Example 1, the undercoat layer was prepared in the same manner as in Example, and the top coat composition was formed using Comparative Example 1. Comparative Example 2 used a coating layer formed using a conventional acrylic paint (ACRYPON A500, Aekyung Special Paint).

Peel strength (N) Angle 180° 90° Example 1 0.01 0.01 Comparative Example 1 0.03 0.03 Comparative Example 2 3.01 3.22

From the above results, it can be confirmed that Example 1 has significantly lower peel strength than the conventional paint composition, and thus has excellent release property that is easily released.

[Test Example 4] Comparison of coating film hardness

The pencil hardness of the antifouling coating layer prepared in Test Example 1 was measured according to ASTM D3363. Specifically, the tree of a berol eagle turguoise pencil with an exposed length of 6 to 10 mm, which retains the pencil lead, is cut off and peeled off, and the tip of the pencil tip is flattened at 90 degrees to the pencil axis using sandpaper (Fine grif sand or emery paper). Holding the pencil at 45 degrees with the coating film of the coating layer, while applying enough pressure not to break the tip, push forward about 6 mm to achieve the maximum pencil hardness without rupture of the coating film. Pencil hardness is expressed as 9H~1H, F, 1B~9B in order of highest. In the specimen of Comparative Example 1, the undercoat layer was prepared in the same manner as in Example, and the top coat composition was formed using Comparative Example 1.

The measured pencil hardness was 4B in Comparative Example, whereas Example 1 was 1H, and it can be seen that it has remarkably improved hardness.

[Test Example 5] Comparison of water repellency

The contact angle of water droplets on the antifouling coating layer prepared as in Test Example 1 was measured. In the specimen of Comparative Example 1, the undercoat layer was prepared in the same manner as in Example, and the top coat composition was formed using Comparative Example 1. Specifically, water droplets are dropped on the surface of the coating layer, and the contact angle of the water droplets is measured as shown in FIG. 1 .

As shown in FIG. 2, the higher the contact angle, the better the water repellency, and the release property is also excellent.

As a result of the measurement, the contact angle of Comparative Example 1 was 70 °, whereas that of Example 1 was 90 °, and it could be confirmed that the water repellency was rather improved even without the formation of a film using a platinum-based catalyst.

Claims (11)

An antifouling coating composition comprising a top coating composition,
The top coat composition includes 75 to 90% by weight of a base resin containing polysiloxane, 0.01 to 0.5% by weight of epoxy silane, 0.1 to 1.0% by weight of 2-butanone oxime, ceramic beads and glass beads, based on the total weight of the topcoat composition. 1.0 to 20% by weight, 0.5 to 5% by weight of at least one of polyamide wax and polyethylene wax, and a solvent,
The base resin is an antifouling paint composition comprising polyorganosiloxane and polyhydrogensiloxane. delete delete delete delete delete delete According to claim 1,
The top coating composition is to form an anti-adhesive layer on top of the primer layer of the anti-fouling paint, the anti-fouling paint composition. According to claim 8,
An antifouling coating composition further comprising an undercoating composition forming the primer layer. According to claim 9,
The undercoating composition is an antifouling coating composition comprising an acrylic resin and a solvent. According to claim 1,
An antifouling coating composition further comprising at least one additive selected from a thickener, a dispersing agent, an antifoaming agent, a plasticizer, an antibacterial agent, an ultraviolet absorber, an absorbent, a foaming agent, a carbonizing agent, a pigment, and a matting agent.

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