KR102391000B1 - Epoxy type paint composition and offshore structure comprising coating film of thereof - Google Patents

Abstract

The present invention relates to an epoxy paint composition and a marine structure having a coating film thereof. a curing agent part selected from a group amine, an aromatic amine, an amide, or a combination thereof, wherein the content of the epoxy resin is 2 to 35 parts by weight based on 100 parts by weight of the main part, and the content of the vinyl resin is the main part Based on 100 parts by weight, it is characterized in that 1 to 25 parts by weight.

Description

Epoxy type paint composition and offshore structure comprising coating film of thereof

The present invention relates to an epoxy paint composition and a marine structure having a coating film thereof.

The development and use of epoxy paint compositions applicable to severe corrosive environments such as ballast tanks of ships, crude oil tanks, and seawater submerged areas of offshore structures are increasing.

When painting the submerged part of an offshore structure, it is common to paint with a total of four layers of anti-rust paint, sealer, anti-fouling paint, and anti-fouling paint in order from the substrate, which is the painted surface. The anti-corrosive paint uses a material having excellent anti-rust property and provides anti-rust property to the submerged area while in contact with the substrate. However, in the case of the sealer, although the adhesion to the antifouling paint is excellent, there is a disadvantage in that the rust prevention property is poor. Therefore, there was a problem in that the existing coating film could not guarantee the rust prevention properties of the coating film if the antifouling coating was damaged in a severe corrosive environment such as a submerged area.

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to provide an epoxy paint that provides excellent adhesion to an antifouling paint formed as a top coat while maintaining adhesion to a substrate and excellent rust prevention properties. to provide a composition.

The epoxy paint composition according to an aspect of the present invention includes a main part comprising an epoxy resin containing two or more epoxy groups in a molecule, a vinyl resin, and a rust preventive pigment containing aluminum, and an aliphatic amine, a cycloaliphatic amine, an aromatic amine , amide or a combination thereof, wherein the content of the epoxy resin is 2 to 35 parts by weight based on 100 parts by weight of the main part, and the content of the vinyl resin is based on 100 parts by weight of the main part. , characterized in that 7 to 25 parts by weight.

Specifically, the epoxy resin may include at least one of a bisphenol A-type epoxy resin and a bisphenol F-type epoxy resin and a fatty acid-modified epoxy resin.

Specifically, in the epoxy resin, at least one of the bisphenol A-type epoxy resin and the bisphenol F-type epoxy resin and the fatty acid-modified epoxy resin may be included in a weight ratio of 1:15 to 20:1.

Specifically, the epoxy resin and the vinyl resin may be included in a weight ratio of 4:1 to 0.5:1.

Specifically, the content of the fatty acid-modified epoxy resin may be 1 to 20 parts by weight based on 100 parts by weight of the main part.

Specifically, the weight ratio of the main agent and the curing agent may be 80:20 to 95:5.

The marine structure according to one aspect of the present invention is characterized in that it has a coating film of the epoxy paint composition.

The epoxy paint composition according to the present invention can implement a coating film having excellent anti-rust properties while providing excellent adhesion to a substrate.

In addition, the epoxy paint composition according to the present invention provides excellent adhesion to a top coat such as an antifouling paint, so that the sealer provided for attaching an antifouling paint can be omitted, thereby simplifying the painting process and improving workability. can

Effects of the present invention are not limited to the above-described effects, and effects not mentioned will be clearly understood by those skilled in the art from the present specification and accompanying drawings.

Throughout this specification, when a part "includes" a certain element, it means that other elements may be further included, rather than excluding other elements, unless otherwise stated.

Throughout this specification, the unit "part by weight" may mean a ratio of weight between each component.

Hereinafter, the present specification will be described in more detail.

The coating composition according to an embodiment of the present invention may include a main part and a curing agent part, and the main part may include an epoxy resin containing two or more epoxy groups in a molecule, a vinyl resin, and a rust preventive pigment containing aluminum, , the curing agent part may include a curing agent selected from aliphatic amines, cycloaliphatic amines, aromatic amines, amides, or combinations thereof. In this case, the content of the epoxy resin may be 2 to 35 parts by weight based on 100 parts by weight of the main part, and the content of the vinyl resin may be 7 to 25 parts by weight based on 100 parts by weight of the main part.

The epoxy resin of the present invention may include an epoxy resin having a solid volume ratio of 95% or more having little content of a volatile solvent. A coating composition containing an epoxy resin having a solid volume ratio of 95% or more can implement a coating film having excellent physical properties such as corrosion resistance and seawater resistance.

The epoxy equivalent weight (EEW) of the epoxy resin may be 100 g/eq or more and 900 g/eq or less, and preferably, the equivalent weight of the epoxy resin may be 100 g/eq or more and 500 g/eq or less. By adjusting the epoxy equivalent of the epoxy resin to the above-mentioned range, it is possible to suppress excessive increase in the viscosity of the epoxy paint composition, thereby preventing the dispersibility and coating workability of the paint from being deteriorated.

The epoxy resin may include at least one of a bisphenol A-type epoxy resin and a bisphenol F-type epoxy resin having two or more epoxy groups in a molecule, and a fatty acid-modified epoxy resin.

Specifically, the epoxy resin may include at least one of bisphenol-A diglycidyl ether (DGEBA) and bisphenol-F (BPF) diglycidyl ether, preferably bisphenol-A diglycidyl ether (DGEBA).

At least one of the bisphenol A-type epoxy resin and the bisphenol F-type epoxy resin may be included in an amount of 1 part by weight or more and 20 parts by weight or less, preferably 5 parts by weight or more and 15 parts by weight or less, based on 100 parts by weight of the main part. . If it is out of the above range, problems such as rust prevention and poor adhesion with subsequent coating may occur.

The fatty acid-modified epoxy resin may be obtained by addition reaction of a monovalent fatty acid and a divalent or higher polybasic acid to an epoxy resin. The monovalent fatty acid may be a linear fatty acid having 20 to 30 carbon atoms, but is not limited thereto. The divalent or higher polybasic acid may be, for example, sulfuric acid, oxalic acid, phosphoric acid, citric acid, or pyrophosphoric acid, but is not limited thereto.

The fatty acid-modified epoxy resin may be obtained by reacting 10 to 40 parts by weight based on 100 parts by weight of the epoxy resin. The fatty acid-modified epoxy resin may be 1 part by weight or more and 15 parts by weight or less, for example, 3 parts by weight or more and 10 parts by weight or less, based on 100 parts by weight of the main part.

Therefore, in the epoxy resin, at least one of the bisphenol A type epoxy resin and the bisphenol F type epoxy resin and the fatty acid-modified epoxy resin may be included in a weight ratio of 1:15 to 20:1.

By adjusting the fatty acid-modified epoxy resin to the above-mentioned range, the degree of crosslinking of the coating film formed by the coating composition is lowered, so that the new coating component can easily penetrate into the coating film already formed on the substrate during the subsequent coating operation on the coating film. there is. The top road going up to the subsequent coating can be an antifouling coating film, and by allowing the antifouling coating component to easily penetrate into the coating film, interlayer adhesion to the top coating can be improved.

The content of the epoxy resin may be 2 parts by weight or more and 35 parts by weight or less, based on 100 parts by weight of the main part. Preferably, the content of the epoxy resin may be 8 parts by weight or more and 25 parts by weight or less.

By adjusting the content of the epoxy resin to the above-mentioned range, as the pigment content increases, the viscosity of the coating composition increases, thereby preventing deterioration in workability and appearance of the coating film, and coating film properties such as rust prevention and seawater resistance are reduced can be restrained In addition, when the content of the epoxy resin is within the above-mentioned range, the pot life of the epoxy paint composition can be improved, and mechanical properties such as coating film hardness can be suppressed from being reduced.

The main part of the epoxy paint composition according to an embodiment of the present invention may include a vinyl resin. Vinyl resins that make the coating film excellent in corrosion resistance, adhesion to substrates, and top coating suitability refer to vinyl-based (co)polymers, for example, vinyl chloride-based (co)polymers or vinyl acetate-based (co)polymers. However, the present invention is not limited thereto. As the vinyl resin, one type of the above polymer may be used, but two or more types may be mixed and used.

Specifically, the vinyl-based (co)polymer is a vinyl chloride polymer, a vinyl acetate polymer, a vinyl chloride-vinyl acetate copolymer, a vinyl chloride-vinyl propionate copolymer, a vinyl chloride-alkyl vinyl ether copolymer, a vinyl chloride-acrylo Nitrile copolymers, vinyl chloride-ethylene copolymers, vinyl chloride-maleic anhydride copolymers, vinyl chloride-(meth)alkyl acrylate copolymers with an alkyl group having 1 to 5 carbon atoms, vinyl chloride-styrene copolymers, vinyl chloride -vinylidene chloride copolymer, vinyl chloride-vinyl stearate copolymer, vinyl chloride-maleic acid copolymer, vinyl chloride-maleic acid ester copolymer, vinyl chloride-aliphatic vinyl copolymer, ethylene-vinyl acetate copolymer and vinyl chloride It may be at least one selected from the group consisting of -vinyl acetate-vinyl alcohol copolymer. Preferably, it may be at least one selected from a vinyl chloride-alkylvinyl ether copolymer, a vinyl chloride-vinyl acetate copolymer, and an ethylene-vinyl acetate copolymer.

The content of the vinyl resin may be 7 parts by weight or more and 25 parts by weight or less, based on 100 parts by weight of the main part. Preferably, the content of the vinyl resin may be 10 parts by weight or more and 17 parts by weight or less.

By adjusting the content of the vinyl resin in the above-mentioned range, the top coat suitability of the coating film formed by the epoxy paint composition according to the present invention is improved.

The epoxy resin and the vinyl resin may be included in a weight ratio of 4:1 to 0.5:1, or 3:1 to 1:1 by weight. If the weight ratio is out of the above weight ratio, problems such as poor corrosion resistance of the coating film and poor adhesion with the top coating may occur.

The epoxy paint composition according to an embodiment of the present invention may include a rust preventive pigment containing aluminum. The rust preventive pigment may be in the form of a paste, and the aluminum may be aluminum having a flake structure. The rust-preventive pigment can improve the rust-preventive properties of the coating film by blocking or delaying penetration of water and oxygen into the coating film, which is a cause of rusting, compared to aluminum having a spherical structure, including aluminum having a flake structure.

The content of the rust preventive pigment may be included in an amount of 20 parts by weight or less based on 100 parts by weight of the main part, for example, the rust preventive pigment may be 1 part by weight or more and 13 parts by weight or less.

In addition, the epoxy paint composition according to an embodiment of the present invention may further include an extender pigment such as feldspar, for example, 30 parts by weight or more and 55 parts by weight or less based on 100 parts by weight of the main part.

The epoxy paint composition according to an embodiment of the present invention may include a curing agent part including a curing agent selected from an aliphatic amine, a cycloaliphatic amine, an aromatic amine, or a combination thereof.

The aliphatic amine-based curing agent may be at least one selected from the group consisting of alkylmonoamine, alkylenepolyamine, polyalkylenepolyamine, and alkylaminoalkylamine.

The alkylene polyamine may be a compound represented by Formula 1 below.

[Formula 1]

H ₂ NR ₁ -NH ₂

In the formula, R ₁ may be a divalent hydrocarbon having 1 to 12 carbon atoms.

The alkylene polyamine is, for example, methylenediamine, ethylenediamine, 1,2-diaminopropane, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6 -diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminononane, 1,10-diaminodecane, trimethylhexamethylenediamine.

The polyalkylene polyamine may be a compound represented by Formula 2 below.

[Formula 2]

H ₂ N-(C _m H _2m NH) _n H

In the formula, m is an integer from 1 to 10, and n is an integer from 2 to 10, preferably from 2 to 6.

The polyalkylene polyamine is, for example, diethylenetriamine, dipropylenetriamine, triethylenetetramine, tripropylenetetramine, tetraethylenepentamine, tetrapropylenepentamine, pentaethylenehexamine, nonaethylenedecamine, bis(hexamethylene)triamine.

In addition, the aliphatic amine-based curing agent is 1,3-bisaminomethylcyclohexane, 1,4-cyclohexanediamine, 4,4′-methylenebis(cyclohexanamine), 4,4′=isopropylidenebis(cyclo hexanamine), norbornanediamine, bis(aminomethyl)cyclohexane, isophoronediamine, mensendiamine.

Specifically, the aromatic amine-based curing agent may be an aromatic polyamine having two or more primary amino groups on a benzene ring. The aromatic amine curing agent is phenylenediamine, naphthylenediamine, diaminodiphenylmethane, 2,2-bis(4-aminophenyl)propane, 4,4'-diaminodiphenyl ether, 4,4'- Diaminobenzophenone, 4,4'-diaminodiphenylsulfone, 2,2'-dimethyl-4,4'-diaminodiphenylmethane, 2,4'-diaminobiphenyl, 2,3'-dimethyl It may be at least one selected from the group consisting of -4,4'-diaminobiphenyl and 3,3'-dimethoxy-4,4'-diaminobiphenyl.

In addition, the coating composition according to the present invention may include an aromatic amine-based curing agent as a curing agent. The aromatic amine-based curing agent may be bis(aminoalkyl)benzene or bis(aminoalkyl)naphthalene, for example, o-xylylenediamine, m-xylylenediamine (MXDA), p-xylylenediamine , bis(aminomethyl)naphthalene, or bis(aminoethyl)naphthalene.

In addition, the coating composition according to the present invention may include a heterocyclic amine-based curing agent as a curing agent. The heterocyclic amine curing agent is N-methylpiperazine, morpholine, 1,4-bis-(3-aminopropyl)piperazine, 1,4-diazacycloheptane, 1-(2'-amino) ethylpiperazine), 1-[2'-(2"-aminoethylamino)ethyl]piperazine, 1,11-diazacycloeicosane, 1,15-diazacyclooctacoic acid.

In addition, as the curing agent, polyetherdiamine, a modified product of the above-described amine-based curing agent, for example, polyamideamine; amine adducts with epoxy compounds; Mannich-modified products such as Mannich-modified aliphatic polyamines, phenalkamine, and phenalcamide; Michael Adjunct; ketimine; aldimine; It may be a urethane-modified product, preferably polyamideamine.

The curing agent may be an amide curing agent. The amide curing agent may include an alicyclic amine in which hydrogen is added to polyamide and aniline, or an amine in which methylene is bonded to an aromatic amine. The amide curing agent is, for example, polyamide and methylene crosslinked poly(cyclohexyl-aromatic)amine (MPCA), [5,2,1,0]-tricyclodecane-2,6-bis-hexamethylenediamine and It may be at least one selected from the group consisting of methylenedianiline (MDA).

The curing agent of the present invention may contain 50 parts by weight or more and 85 parts by weight or less, specifically 65 parts by weight or more and 80 parts by weight or less, based on 100 parts by weight of the curing agent part.

The curing agent part of the present invention may further include a curing accelerator, and the curing accelerator may be 1 part by weight or more and 10 parts by weight or less based on 100 parts by weight of the curing agent. Specifically, based on 100 parts by weight of the curing agent, the content of the curing accelerator may be 1.5 parts by weight or more and 8 parts by weight or less.

By adjusting the content of the curing accelerator to the above-mentioned range, it is possible to appropriately control the curing rate. Through this, it is possible to suppress the problem of poor coating film properties such as coating film hardness and brushing due to an increase in curing rate, and deterioration of pot life due to an increase in curing rate and poor flowability.

The curing accelerator may include at least one of triethanolamine, dialkylaminoethanol, triethylenediamine, tridimethyl amino methyl phenol, triphenyl phosphite, and amino ethyl piperazine.

The main part and the curing agent part may be mixed in a weight ratio of 80:20 to 95:5.

In the epoxy paint composition according to an embodiment of the present invention, the main part and the curing agent part may include a solvent. The solvent is, for example, xylene, toluene, methyl isobutyl ketone, methyl ethyl ketone, butyl acetate, n-butanol, i-butanol, isopropyl alcohol, benzyl alcohol, propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate. It may be one or more selected from the group consisting of, but is not limited thereto.

In the composition, the solvent may be included in an amount of 5 parts by weight or more and 60 parts by weight or less, preferably 10 parts by weight or more and 50 parts by weight or less, based on 100 parts by weight of the main part and 100 parts by weight of the curing agent part.

The marine structure according to one aspect of the present invention is characterized in that it has a coating film of the epoxy paint composition. In the present invention, the offshore structure may include all of a ship, an offshore plant, and an offshore floating object.

The coating film provided on the marine structure according to an embodiment of the present invention may include a cured product of the epoxy paint composition.

The epoxy paint composition according to an embodiment of the present invention may be suitable for forming a coating film on a substrate that is a surface of a submerged part of a ship. The epoxy paint composition forms a coating film having excellent rust prevention properties on a base material, while repainting the top coat is possible on the coating film and provides excellent adhesion to the top coat.

Hereinafter, examples will be given to describe the present invention in detail. However, the embodiments according to the present invention may be modified in various other forms, and the scope of the present invention is not to be construed as being limited to the embodiments described below. The embodiments of the present specification are provided to more completely explain the present invention to those of ordinary skill in the art.

Example. Preparation of Epoxy Paint Composition

Examples 1 to 10

A main part was prepared with the composition (unit: parts by weight) as shown in Table 1 below.

Specifically, bisphenol-A type epoxy resin (epoxy equivalent 189 g/eq), the bisphenol-A type epoxy resin is mixed with mono fatty acid and dimer fatty acid, and 40 parts by weight based on 100 parts by weight of the epoxy resin is modified fatty acid modified epoxy Resin (epoxy equivalent 870 g/eq), vinyl chloride-vinyl acetate-vinyl alcohol copolymer (Dow Chemical Japan) and xylene as a solvent were mixed, feldspar as an extender pigment, and aluminum paste (Jinana Yasida Chemical) as an anti-rust pigment The main part was prepared by mixing.

In addition, a curing agent part including a polyamine resin (Cardolite) or a polyamide amine resin (Air product) was prepared with a composition (unit: parts by weight) as shown in Table 1 below.

Thereafter, an epoxy paint composition was prepared by mixing a main part and a curing agent part at a mixing ratio (weight ratio) as shown in Table 1 below. The specific composition is as shown in Table 1 below.

Example #One #2 #3 #4 #5 #6 #7 #8 #9 #10 main
my
wealth epoxy resin 11 11 11 11 13 15 11 11 15 11 fatty acid denaturation
epoxy resin 6 6 6 6 6 6 10 14 6 6 epoxy resin
Sum 17 17 17 17 19 21 21 23 21 17 plastic
profit 14 14 14 14 14 14 14 14 8 19 Epoxy Resin: Vinyl
resinous
weight ratio 1.21 1.21 1.21 1.21 1.36 1.5 1.5 1.64 2.6 0.89 solvent 19 19 19 19 17 15 15 13 19 19 constitution
pigment 50 45 40 40 40 40 40 40 42 35 rust
pigment 0 5 10 10 10 10 10 10 10 10 Sum 100 100 100 100 100 100 100 100 100 100 kyung
fury
my
wealth amide hardener 73 73 73 0 73 73 73 73 73 73 amine
hardener 0 0 0 73 0 0 0 0 0 0 solvent 20 20 20 20 20 20 20 20 20 20 tertiary amines 7 7 7 7 7 7 7 7 7 7 Sum 100 100 100 100 100 100 100 100 100 100 mixing ratio subject 91 91 91 91 93 89 84 90 90 90 hardener 9 9 9 9 7 11 16 10 10 10

Comparative Examples 1 to 8

The same method as in the Example, except that the vinyl resin was not included, the content was different, the weight ratio of the epoxy resin to the vinyl resin was different from that of the above example, or the content of the epoxy resin was different during the preparation of the main material to prepare an epoxy paint composition. The specific composition is as shown in Table 2 below.

comparative example #One #2 #3 #4 #5 #6 #7 #8 main
my
wealth epoxy resin 11 11 11 20 4 11 25 15 fatty acid denaturation
epoxy resin 6 6 6 15 One 0 7 20 epoxy resin
Sum 17 17 17 35 5 11 32 35 plastic
profit 0 4.5 27 7 25 14 10 7 Epoxy Resin: Vinyl
Weight ratio of resin - 3.78 0.63 5 0.2 0.79 3.2 5 solvent 20 19 19 14 20 20 12 12 constitution
pigment 53 49.5 27 34 40 45 36 36 rust
pigment 10 10 10 10 10 10 10 10 Sum 100 100 100 100 100 100 100 100 kyung
fury
my
wealth amide hardener 73 73 73 73 73 73 73 73 amine
hardener 0 0 0 0 0 0 0 0 solvent 20 20 20 20 20 20 20 20 tertiary amines 7 7 7 7 7 7 7 7 Sum 100 100 100 100 100 100 100 100 mixing ratio subject 91 93 91 91 91 91 91 91 hardener 9 7 9 9 9 9 9 9

experimental example. Evaluation of the physical properties of the epoxy paint composition

The epoxy paint compositions prepared in Examples 1 to 10 and Comparative Examples 1 to 8 were coated under the following conditions. First, rust, dust, moisture, oil and other contaminants on the surface of the substrate were completely removed using fresh water or an appropriate solvent, and then blaster-polished to a surface roughness of 25 μm to 75 μm. And, using an airless spray on the prepared specimen, the nozzle diameter was 0.019" to 0.025", the injection pressure was 3bar to 5bar, and the injection angle was set to 50°. Physical properties such as rust prevention, seawater resistance, and repainting interval were evaluated for the obtained coating film properties, and the results are shown in Tables 3 and 4 below.

The specific test method is as follows.

rust prevention

In accordance with ASTM B117, the specimen tested for 1400 hours in a SALTFOG machine was exposed to evaluate the degree of swelling of the coating film, blister (blister) and the coating film peeling distance, and the evaluation results are shown in Tables 3 and 4 below.

sea water resistance

According to ASTM D870, the surface blister and peeling distance of the coating film were evaluated in the specimen immersed in a bath containing seawater for 6 months, and the evaluation results are shown in Tables 3 and 4 below.

repainting interval

In accordance with ASTM D3359, the adhesion was evaluated by immersing the specimen in seawater for 1 month after the second coating was performed after a time elapsed after the minimum coating, and the evaluation results are shown in Tables 3 and 4 below.

Airless Spray Workability

Using airless spray, set the nozzle diameter 0.019" to 0.025", spray pressure 3 bar to 5 bar, and spray angle 50°, and then paint, and airless spray pattern under low temperature (10℃ or less) conditions, The maximum flowable thickness, thin film dry film (200 μm or less) leveling, and high temperature (35° C. or higher) pot life were measured, and the measurement results are shown in Tables 3 and 4 below.

division Example #One #2 #3 #4 #5 #6 #7 #8 #9 #10 room
jean
castle Blister No.
8F No.
10 No.
10 No.
10 No.
10 No.
10 No.
10 No.
10 No.
10 No.
10 film
separation distance 8mm 5mm 3mm 3mm 2mm 1mm 4mm 6mm 2mm 2mm inland sea
Mercury Blister No.
8F No.
10 No.
10 No.
10 No.
10 No.
10 No.
10 No.
10 No.
10 No.
10 film
separation distance 6mm 3mm 2mm 2mm 1mm 1mm 3mm 5mm 3mm 3mm Repainting (immersion) 7 days 5 days 5 days 5 days 3 days 3 days 3 days 3 days 5 days 5 days Workability 5 4 4 4 3 3 3 3 5 3

division comparative example #One #2 #3 #4 #5 #6 #7 #8 room
jean
castle Blister No.10 No.10 No.10 No.10 No.10 No.10 No.10 No.10 film
separation distance 2mm 2mm 4mm 2mm 15mm 2mm 1mm 10mm inland sea
Mercury Blister No.10 No.10 No.10 No.10 No.10 No.10 No.10 No.10 film
separation distance 2mm 2mm 3mm 2mm 10mm 2mm 1mm 9mm Repainting (immersion) 1 day 1 day 7 days 1 day 7 days 2 days 1 day 2 days Workability 5 5 One 5 One 3 3 5

The evaluation for blister is No.2 > No.4 > No.6 > No.8 > No.10 based on size, and No.10 indicates that no blistering occurred.

The blister frequency is expressed as D=Dense, MD=Medium Dense, M=Medium, F=Few.

Workability was shown in the order of 5 (good) > 4 > 3 > 2 > 1 (poor).

Referring to Table 3, it was confirmed that the epoxy paint compositions according to Examples 1 to 10 of the present invention exhibit excellent workability and excellent rust prevention properties. In addition, excellent adhesion was exhibited even when immersed in seawater after repainting.

On the other hand, in Comparative Example 1 in which a vinyl resin was not added and Comparative Example 2 in which the content of the vinyl resin was too low, it was found that the penetration of the topcoat component for repainting was not easy and thus the adhesion was significantly lowered. In the case of Comparative Example 3, which had an excessively high content, it was confirmed that the viscosity of the coating composition increased and thus workability was very poor.

Comparative Example 4 was made to contain an excess of the epoxy resin compared to the weight ratio of the epoxy resin and the vinyl resin according to an embodiment of the present invention, and as a result, it was confirmed that the adhesion of the coating film was significantly lowered. In addition, Comparative Example 5 was made to include an excess of vinyl resin, and as a result, it was found that the degree of peeling of the coating film was the largest in both rust prevention and seawater resistance evaluation.

In Comparative Example 6, the fatty acid-modified epoxy resin was not added, and in Comparative Example 7, an excessive amount of the epoxy resin was included. As a result, it was confirmed that the workability was poor in the two comparative examples. In Comparative Example 8, an excess of fatty acid-modified epoxy resin was included, and as a result, it was found that the degree of peeling of the coating film was the greatest in both rust prevention and seawater resistance evaluation.

Therefore, it can be seen that the epoxy paint composition according to an embodiment of the present invention is excellent in airless spray painting workability and rust prevention, and can implement a coating film having excellent re-coatability even under seawater immersion conditions.

It goes without saying that the present invention is not limited to the embodiments described above, and a combination of the embodiments or a combination of at least one of the embodiments and a known technology may be included as another embodiment.

Although the present invention has been described in detail through specific examples, it is intended to describe the present invention in detail, and the present invention is not limited thereto, and by those of ordinary skill in the art within the technical spirit of the present invention It will be clear that the transformation or improvement is possible.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be clarified by the appended claims.

Claims (6)

a main part comprising an epoxy resin containing two or more epoxy groups in a molecule, a vinyl resin, and a rust preventive pigment containing aluminum; and
a curing agent moiety selected from aliphatic amines, cycloaliphatic amines, aromatic amines, amides, or combinations thereof;
The content of the epoxy resin is 2 to 35 parts by weight based on 100 parts by weight of the main part,
The content of the vinyl resin is 7 to 25 parts by weight based on 100 parts by weight of the main part,
The epoxy resin includes at least one of a bisphenol A type epoxy resin and a bisphenol F type epoxy resin and a fatty acid-modified epoxy resin,
The epoxy resin has a solid volume ratio of 95% or more,
The epoxy resin is
At least one of the bisphenol A type epoxy resin and the bisphenol F type epoxy resin has an epoxy equivalent of 100 to 200 g/eq,
An epoxy paint composition, characterized in that the fatty acid-modified epoxy resin has an epoxy equivalent of 730 to 870 g/eq. delete The method of claim 1,
In the epoxy resin, at least one of the bisphenol A type epoxy resin and the bisphenol F type epoxy resin and the fatty acid-modified epoxy resin are included in a weight ratio of 1:15 to 20:1. The epoxy paint composition. The method of claim 1,
The epoxy resin and the vinyl resin are 4 : 1 to 0.5 : Epoxy paint composition, characterized in that included in a weight ratio of 1. The method of claim 1,
The content of the fatty acid-modified epoxy resin is an epoxy paint composition, characterized in that 1 to 20 parts by weight based on 100 parts by weight of the main part. The method of claim 1,
The weight ratio of the main agent and the curing agent is 80:20 to 95:5 epoxy paint composition, characterized in that.