Solvent-free epoxy coating composition

Abstract

The present invention relates to a solvent-free epoxy coating composition comprising an epoxy resin, a bifunctional reactive diluent, an amine-based curing agent, and an extender pigment, wherein the extender pigment includes talc having a D50 of 8 μm to 15 μm, and the content of the bifunctional reactive diluent is 1 wt% to 15 wt% based on the total weight of the composition.

Description

Solvent-free epoxy paint composition

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0159442 filed November 11, 2024, the entire contents of which are incorporated herein.

[0002] The present invention relates to a solvent-free epoxy paint composition that is environmentally friendly as it does not contain organic solvents and has excellent sprayability.

[0003] Epoxy paints are used as protective coatings for ships and offshore structures because they provide excellent durability, chemical resistance, and waterproofing performance. In particular, polar vessels such as icebreakers require high-strength protective coatings capable of withstanding repeated collisions with ice, and accordingly, high-viscosity, solvent-free epoxy paints are primarily used.

[0004] However, conventional solvent-free epoxy paints have very high viscosity of the main component and the hardener, which results in poor workability. To address this, painting is performed using a two-component airless spray equipment capable of heating. The two-component spray equipment is a device that can powerfully spray high-viscosity paint by mixing two components in a fixed ratio during painting, and is advantageous for applying high-viscosity materials such as solvent-free epoxy paints.

[0005] However, when using two-component spray equipment for painting, there is a disadvantage in that the painting process is complex because the equipment itself is complex and difficult to manage. This can be a particular problem in environments such as shipyards where a large volume of painting work is required.

[0006] Therefore, there is a need to develop a new paint composition that has low viscosity and excellent sprayability while maintaining the physical and chemical properties provided by existing solvent-free epoxy paints.

[0007] The present invention aims to provide a solvent-free epoxy paint composition that is environmentally friendly by not containing organic solvents and has excellent sprayability.

[0008] [1] The present invention is a composition comprising an epoxy resin, a difunctional reactive diluent, an amine-based curing agent, and a extender pigment, wherein the extender pigment is D 50 A solvent-free epoxy paint composition is provided, comprising talc having a thickness of 8 μm to 15 μm, wherein the content of the difunctional reactive diluent is 1% to 15% by weight based on the total weight of the composition.

[0009] [2] The present invention provides a solvent-free epoxy paint composition in which, in [1] above, the epoxy resin is a bisphenol A type epoxy resin.

[0010] [3] The present invention provides a solvent-free epoxy paint composition, wherein, in [1] or [2], the difunctional reactive diluent is one or more selected from the group consisting of 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and neopentyl glycol diglycidyl ether.

[0011] [4] The present invention provides a solvent-free epoxy paint composition in which, in at least one of [1] to [3], the oil absorption amount of the talc is 21% to 30%.

[0012] [5] The present invention provides a solvent-free epoxy paint composition comprising, in at least one of [1] to [4], 20% to 50% by weight of the epoxy resin based on the total weight of the composition; 1% to 15% by weight of the difunctional reactive diluent; 10% to 30% by weight of the amine-based curing agent; and 10% to 40% by weight of the talc.

[0013] [6] The present invention provides a solvent-free epoxy paint composition, wherein, in at least one of [1] to [5], the composition further comprises one or more selected from the group consisting of a silane compound, a thickener, and a dispersant.

[0014] The epoxy paint composition according to the present invention has low viscosity, resulting in excellent airless sprayability, and is environmentally friendly as it does not contain organic solvents.

[0015] In addition, the coating film produced using the above epoxy paint composition has excellent appearance characteristics, abrasion resistance, adhesion, cathodic peel resistance, and rust prevention properties.

[0016] The present invention will be described in detail below.

[0017] In the present invention, functional groups such as "epoxy equivalents" can be measured by methods known in the art, for example, by titration.

[0018] In addition, in the present invention, "weight-average molecular weight" and "number-average molecular weight" can be measured by conventional methods known in the art, for example, by the GPC (gel permeation chromatograph) method.

[0019] In the present invention, "D 50 " and "D 90 " represents the particle size corresponding to 50% and 90% of the volume cumulative amount, respectively, in the volume cumulative particle size distribution of the corresponding particle powder, and can be measured by conventional methods known in the art. For example, it can be measured using the laser diffraction method, and specifically, using the Malvern Mastersizer 3000 instrument.

[0020] In the present invention, "oil absorption amount" is a value measured according to the method of KS M 5131.

[0021]

[0022] The solvent-free epoxy paint composition according to the present invention comprises an epoxy resin, a difunctional reactive diluent, an amine-based curing agent, and a extender pigment. Each component is described in more detail below.

[0023]

[0024] Epoxy resin

[0025] The above epoxy resin serves as the main resin of the epoxy paint composition and plays a role in controlling the characteristics of the manufactured coating film.

[0026] The epoxy equivalent (EEW) of the above epoxy resin may be 100 g / eq to 300 g / eq, preferably 100 g / eq to 200 g / eq. It is desirable for the epoxy equivalent of the epoxy resin to be 100 g / eq or higher in order to secure a pot life of at least a certain amount, improve adhesion to the iron substrate, and prevent cracking of the coating film. However, if the epoxy equivalent is excessive, the viscosity of the paint composition increases, which may reduce sprayability; therefore, it is desirable not to exceed the above range.

[0027] The above epoxy resin may be a bisphenol A type epoxy resin. The hydrophobic hydrocarbon groups of the bisphenol A type epoxy resin are oriented toward the surface of the prepared coating film, thereby preventing the penetration of moisture. The hydrophilic epoxy groups and / or hydroxyl groups of the bisphenol A type epoxy resin are oriented toward the surface of the coating substrate and can contribute to increasing adhesion through chemical bonding with the substrate.

[0028] The above bisphenol A type epoxy resin may have at least two epoxy groups in one molecule, and specifically, the bisphenol A type epoxy resin may be represented by the following chemical formula 1.

[0029] [Chemical Formula 1]

[0030]

[0031] In Chemical Formula 1, n can be a real number from 0 to 2.

[0032] The content of the epoxy resin may be 20% to 50% by weight, preferably 30% to 40% by weight, based on the total weight of the composition. Since excessive content of the epoxy resin may reduce sprayability, it is desirable that the epoxy resin be included within the above content range.

[0033]

[0034] difunctional reactive diluent

[0035] Reactive diluents play a role in improving workability by controlling the viscosity of the paint composition. Since the solvent-free epoxy paint composition of the present invention includes a difunctional reactive diluent, it is advantageous for improving film properties by increasing the crosslinking density compared to a composition containing a monofunctional reactive diluent.

[0036] The above-mentioned difunctional reactive diluent may be a glycidyl ether-based compound, specifically one or more selected from the group consisting of 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and neopentyl glycol diglycidyl ether.

[0037] The epoxy equivalent of the above-mentioned difunctional reactive diluent is 100 g / eq to 300 g / eq, and preferably 100 g / eq to 200 g / eq. If a difunctional reactive diluent with an epoxy equivalent of less than 100 g / eq is included, the pot life of the paint composition is shortened and the crosslinking density becomes excessively high, which reduces adhesion to the iron substrate and may cause cracks to form within the paint film. On the other hand, if a difunctional reactive diluent with an epoxy equivalent exceeding 300 g / eq is included, sprayability is reduced as the viscosity of the paint composition increases.

[0038] The content of the above-mentioned difunctional reactive diluent may be 1% to 15% by weight, preferably 4% to 10% by weight, based on the total weight of the composition. When the difunctional reactive diluent is included in the composition at the above amount, the viscosity of the composition can be lowered, thereby allowing the content of solids to be increased accordingly. However, when a coating film is formed using a paint composition containing an excessive amount of the difunctional reactive diluent, the abrasion resistance and rust resistance of the coating film may be reduced due to a decrease in crosslinking density, so it is preferable not to exceed the above range.

[0039]

[0040] Amine-based curing agent

[0041] The curing agent plays the role of curing the paint composition by reacting with the epoxy resin, and the amine-based curing agent has the advantage of being fast-reactive.

[0042] The above amine-based curing agent may be, for example, an aliphatic amine compound, a cycloaliphatic amine compound, an aromatic amine compound, or a combination thereof.

[0043] The above-mentioned aliphatic amine compounds are alkylene polyamines such as 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, and trimethylhexamethylenediamine; polyalkylene polyamines such as diethylenetriamine, dipropylenetriamine, triethylenetetramine, tripropylenetetramine, tetraethylenepentamine, tetrapropylenepentamine, pentaethylenehexamine, nonaethylenedecamine, and bis(hexamethylene)triamine; and may be one or more selected from the group consisting of alkylamines such as tetra(aminomethyl)methane, tetrakis(2-aminoethylaminomethyl)methane, 1,3-bis(2'-aminoethylamino)propane, diethylene glycol bis(3-aminopropyl)ether, 2,2'-[ethylenebis(iminotrimethyleneimino)]bis(ethanolamine), tris(2-aminoethyl)amine, and bis(cyanoethyl)diethylenetriamine.

[0044] The above cycloaliphatic amine compounds may be one or more selected from the group consisting of 1,3-bis-aminomethylcyclohexane, 1,4-cyclohexanediamine, 4,4'-methylenebis(cyclohexanamine), 4,4'-isopropylidenebis(cyclohexanamine), norbornandiamine, bis(aminomethyl)cyclohexane, isophoronediamine, and menthenediamine (MDA).

[0045] The above aromatic amine compounds may be one or more selected from the group consisting of 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-4,4'-diaminobiphenyl, 3,3'-dimethoxy-4,4'-diaminobiphenyl, o-xylylenediamine, m-xylylenediamine (MXDA), p-xylylenediamine, bis(aminomethyl)naphthalene, and bis(aminoethyl)naphthalene.

[0046] In addition, the above amine-based curing agent may be a modified product of the aforementioned amine-based compound.

[0047] Preferably, the amine-based curing agent may be the cycloaliphatic amine compound or a modified product thereof.

[0048] The active hydrogen equivalent (AHEW) of the above amine-based curing agent may be 50 g / eq to 1,000 g / eq, specifically 80 g / eq to 500 g / eq.

[0049] The content of the amine-based curing agent may be 10% to 30% by weight, preferably 15% to 25% by weight, based on the total weight of the composition. It is desirable for the content of the amine-based curing agent to be within the above range, as it prevents a decrease in rust resistance due to incomplete curing of the composition while also preventing a decrease in flexural strength due to over-curing.

[0050]

[0051] Body pigment

[0052] The solvent-free epoxy paint composition of the present invention comprises a extender pigment, and said extender pigment is D 50 It includes talc having a thickness of 8㎛ to 15㎛. Specifically, D of the talc 50 It can be 9㎛ to 12㎛, more specifically 10㎛ to 11㎛.

[0053] The type and particle size of extender pigments used in paint compositions have a significant impact on sprayability and corrosion resistance. Unlike feldspar, silica, and barium sulfate, talc has a plate-like structure, so when included in a paint composition, it is highly effective in improving corrosion resistance. In addition, since it has a lower oil absorption capacity compared to muscovite, it is highly effective in improving the sprayability of the paint composition. However, the paint composition D 50 If the talc content falls short of the above range, there is a problem of aggregation and precipitation due to poor dispersibility. However, D 50When talc is used in excess of the above range, the voids between talc particles within the coating film increase, making it easier for corrosion-causing substances such as water and oxygen to penetrate, which leads to a problem of reduced corrosion resistance. In other words, when talc with a particle size distribution satisfying the above range is used, a paint composition with excellent dispersibility that facilitates spraying can be obtained, and high corrosion resistance can be expected when a coating film is manufactured using the above paint composition.

[0054] Meanwhile, D of the above talc 90 The particle size may be 60㎛ or less, specifically 50㎛ or less, and more specifically 10㎛ to 50㎛. As explained above, if the particle size becomes excessively large, the penetration of corrosion-causing substances becomes easier, which may impair the corrosion resistance of the coating film; therefore, D 90 It is desirable to satisfy the above range.

[0055] The oil absorption amount of the above talc may be 21% to 30%, preferably 23% to 28%, and more preferably 24% to 27%. Since using talc with an oil absorption amount lower than the above range may reduce the sag resistance of the composition, and using talc with an oil absorption amount exceeding the above range may reduce sprayability, it is preferable that the oil absorption amount of the talc be within the above range.

[0056] The content of the talc may be 10% to 40% by weight, preferably 20% to 30% by weight, based on the total weight of the composition. When talc is included in the composition at the above amount, excellent anti-corrosion properties and sprayability can be achieved. Since sprayability may be reduced due to high viscosity when forming a coating film using a paint composition containing an excessive amount of talc, it is preferable not to exceed the above range.

[0057] Meanwhile, in addition to talc, the above composition may further include one or more sieving pigments selected from feldspar, muscovite, and barium sulfate.

[0058]

[0059] additives

[0060] The solvent-free epoxy paint composition of the present invention may further include one or more selected from the group consisting of a silane compound, a thickener, and a dispersant.

[0061] If the above composition includes a silane compound, the low-temperature drying characteristics, flexibility, and adhesion of the coating film produced thereby may be improved. The silane compound is not particularly limited, but may be, for example, an epoxy silane compound, an amino silane compound, or a combination thereof.

[0062] Specifically, the silane compound is, specifically, methacryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, tris(3-trimethoxysilylpropyl)isocyanurate, γ-mercaptopropyltrimethoxysilane, beta-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, gamma-isocyanatopropyltrimethoxysilane, (methacryloxymethyl)trimethoxysilane, (isocyanatomethyl)trimethoxysilane, aminopropyltrimethoxysilane, aminopropyltriethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, triamino-functional trimethoxysilane (e.g., Silquest A-1130), may be one or more selected from the group consisting of bis(gamma-trimethoxysilylpropyl)amine, N-ethyl-γ-aminoisobutyltrimethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, 4-amino-3,3-dimethylbutyltrimethoxysilane, (N-cyclohexylaminomethyl)triethoxysilane and (N-phenylaminomethyl)trimethoxysilane.

[0063] The above-mentioned thickener serves to control the viscosity of the paint composition. The above-mentioned thickener is not particularly limited, but may be one or more selected from the group consisting of, for example, polysaccharide-based thickeners such as xanthan; cellulose-based thickeners such as carboxymethylcellulose; acrylate thickeners; polyether-modified polyurethane thickeners; bentonite-based thickeners such as bentonite; metal organyl-based thickeners such as titanate and zirconate; organic clay-based thickeners; silica; and wax.

[0064] The above-mentioned dispersant serves to prevent the aggregation of particles within the composition. The above-mentioned dispersant is not particularly limited but may be one or more selected from the group consisting of ionic dispersants such as sodium pyrophosphate, sodium lauryl sulfate, and quaternary ammonium salts; non-ionic dispersants such as polyethylene phenyl oxide derivatives and acrylamide; and amphoteric dispersants such as polyacrylic acid, polymethacrylic acid, and polymaleic acid.

[0065] In addition, in addition to the above silane compound, thickener, and dispersant, additives such as pigments may further include additives used in the conventional technical field.

[0066]

[0067] paint composition

[0068] The solvent-free epoxy paint composition according to the present invention is environmentally friendly as it does not contain organic solvents, has low toxicity to the human body, has a short drying time, and excellent workability.

[0069] In addition, the above solvent-free epoxy paint composition is a one-component paint that has excellent sprayability and excellent physical and chemical properties.

[0070] Based on the total weight of the composition, the composition may comprise 20% to 50% by weight of the epoxy resin; 1% to 15% by weight of the difunctional reactive diluent; 10% to 30% by weight of the amine-based curing agent; and 10% to 40% by weight of the talc.

[0071] Specifically, based on the total weight of the composition, it may comprise 30% to 40% by weight of the epoxy resin; 4% to 10% by weight of the difunctional reactive diluent; 15% to 25% by weight of the amine-based curing agent; and 20% to 30% by weight of the talc.

[0072]

[0073] The present invention will be explained in more detail below through examples.

[0074] [Examples and Comparative Examples: Preparation of Solvent-Free Epoxy Paint Compositions]

[0075] Epoxy paint compositions of Examples 1 to 7 were prepared by mixing each component according to the compositions listed in Table 1 below. In addition, epoxy paint compositions of Comparative Examples 1 to 11 were prepared by mixing each component according to the compositions listed in Table 2 below.

[0076] Weight (%) Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Epoxy Resin 343434404040342 Functional Reactive Diluent 110482 Functional Reactive Diluent 21042 Functional Reactive Diluent 31041 Functional Reactive Diluent Red Pigment 2222222 Talc 127272727272729 Talc 2 Talc 3 Talc Quartz Malvaceae Muscovite Barium Sulfate Silica Epoxy Silane 33333333 Thickener 33333333 Dispersant 1111111 Amine Curing Agent 20202020202020 Total 100100100100100100100

[0077] Weight (%) Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Comparative Example 11 Comparative Example 12 Epoxy Resin 3 4 3 4 3 4 3 4 3 4 3 4 19 2 4 2 4 2 Functional Reactive Diluent 1 10 10 10 10 10 10 10 20 Functional Reactive Diluent 2 20 Functional Reactive Diluent 3 20 Functional Reactive Diluent 10 Red Pigment 2 2 2 2 2 2 2 2 Talc 12 7 2 7 2 7 Talc 2 2 7 Talc 3 2 7 4 2 Talc 4 2 7 Fedalstone 27 Moucan 27 Barium Sulfate 27 Silica 27 Epoxy Silane 333333333333 Thickener 333333333333 Dispersant 1111111111111 Amine Curing Agent 202020202020202020202020 Total 100100100100100100100100100100100100100

[0078] Information regarding the manufacturer, product name, and physical properties of each component used in the above comparative example and example is as shown in Table 3 below.

[0079] Product Information Epoxy Resin Kukdo Chemical Co., Ltd., Bisphenol A type epoxy resin (Epoxy equivalent: 100 to 200 g / eq) Difunctional Reactive Diluent 1 Evonik Co., Ltd., Epodil 750 (Epoxy equivalent: 100 to 200 g / eq) Difunctional Reactive Diluent 2 Evonik Co., Ltd., Epodil 749 (Epoxy equivalent: 100 to 200 g / eq) Difunctional Reactive Diluent 3 Evonik Co., Ltd., Epodil 732 (Epoxy equivalent: 100 to 200 g / eq) Monofunctional Reactive Diluent Cardolte Co., Ltd., Ultra Lite 513 (Epoxy equivalent: 300 to 400 g / eq) Red Pigment Woosin Pigment Co., Ltd., Iron Oxide Red #808 Talc 1 Rexm Co., Ltd., D 50 : 10.4㎛, D 90 : 50㎛ or less, Oil absorption: 25.87% Talc, 2Rexm Co., D 50 : 5㎛, D90 : 30㎛ or less, Oil absorption: 26.87% Talc, 3Rexm, D 50 : 6.5㎛, D 90 : 25㎛ or less, Oil absorption: 43.26% Talc, 4Rexm Co., D 50 : 19㎛, D 90 : 60㎛ or less, Oil absorption: 18.9% Feldspar Rexm, FK-325 Muscovite Imerys, WG-325 Barium Sulfate Guizhou Saboman Micronized Mining, Barium Sulphate 350mesh Silica 21st Century Silica, Super Silica KS-1500 Epoxy Silane Momentive, Silquest A-187 Thickener BYK, Garamite 1958 Dispersant BYK, Anti-terra-203 Amine Curing Agent Evonik, Ancamine 2280 (Cycloaliphatic amine)

[0080]

[0081] [Experimental Example 1: Evaluation of Composition Properties]

[0082] The physical properties of the epoxy paint compositions of the examples and comparative examples were evaluated in the following manner, and the results are listed in Table 4 below.

[0083]

[0084] (1) Drying time

[0085] An epoxy paint composition was applied to a glass surface with a size of 300 mm × 25 mm × 2 mm to a thickness of 500 µm and dried at 5°C, while the drying time was measured according to ASTM D 5895 using a drying time recorder from BYK.

[0086]

[0087] (2) Sprayability

[0088] The spray atomization was evaluated by counting the number of fingers with the operator's eyes while airless spraying the epoxy paint composition at 5℃.

[0089] Specifically, Grade 5 has the best fissure, and as you go down to Grade 1, the fissure becomes worse.

[0090]

[0091] [Experimental Example 2: Coating Preparation and Evaluation]

[0092] The epoxy paint compositions of the examples and comparative examples were applied to an iron surface with dimensions of 150 mm × 70 mm × 6 mm and left at room temperature for 3 weeks to produce specimens with a dry film thickness of 500 μm. The performance of the prepared specimens was evaluated as follows, and the results are listed in Table 4.

[0093]

[0094] (1) Anti-corrosion

[0095] The above-mentioned specimen was exposed to a SALT FOG machine for 1,440 hours based on ASTM B117 standards, and the length of the film peeling was measured.

[0096]

[0097] (2) Cathode peeling

[0098] A cathodic delamination test was conducted on the above-prepared specimen according to the ISO 15711 Method A standard. Specifically, the specimen was immersed in artificial seawater and tested for 6 months while applying a voltage of 1.05V, after which the length of delamination was measured.

[0099]

[0100] (3) Wear resistance

[0101] Based on ASTM D4060 standards, the specimen prepared above was placed in a wear tester (Taber Abraser, CS-17 Wheel 1000g) and the wear resistance was evaluated by measuring the wear loss after 1,000 cycles.

[0102]

[0103] (4) Adhesion

[0104] After attaching a dolly to the specimen manufactured above based on ISO 4624 standards, the maximum vertical tension of the coating film before the dolly was separated was measured using an adhesion tester.

[0105]

[0106] Classification Experiment Example 1 Experiment Example 2 Drying Time Spray Workability Rust Prevention Cathode Peeling Abrasion Resistance Adhesion Example 1 23 hours Grade 4 5mm 5mm 45mg 17Mpa Example 2 23 hours Grade 4 6mm 5mm 43mg 15Mpa Example 3 23 hours Grade 4 5mm 5mm 46mg 18Mpa Example 4 20 hours Grade 3 3mm 2mm 35mg 18Mpa Example 5 20 hours Grade 3 3mm 3mm 34mg 19Mpa Example 6 20 hours Grade 3 3mm 2mm 35mg 18Mpa Example 7 23 hours Grade 4 4mm 4mm 47mg 18Mpa Comparative Example 1 27 hours Grade 3 11mm 10mm 85mg 10Mpa Comparative Example 2 23 hours Grade 4 10mm 9mm 48mg 16Mpa Comparative Example 3 23 hours Grade 2 4mm 5mm 47mg 17Mpa Comparative Example 4 23 hours Grade 4 10mm 10mm 49mg 16Mpa Comparative Example 5 23 hours Grade 4 10mm 12mm 42mg 17Mpa Comparative Example 6 23 hours Grade 2 5mm 4mm 46mg 16Mpa Comparative Example 7 23 hours Grade 2 5mm 6mm 45mg 16Mpa Comparative Example 8 23 hours Grade 3 10mm 11mm 61mg 14Mpa Comparative Example 9 22 hours Grade 1 3mm 3mm 60mg 14Mpa Comparative Example 10 26 hours Grade 5 11mm 12mm 90mg 10Mpa Comparative Example 11 26 hours Grade 5 10mm 13mm 92mg 11Mpa Comparative Example 12 26 hours Grade 5 10mm 13mm 91mg 10Mpa

[0107] Looking at the results in Table 4, it can be seen that the solvent-free epoxy paint compositions of Examples 1 to 7 have a short drying time and excellent sprayability, and the coating film produced using them has excellent anti-corrosion, anti-cathodic peelability, abrasion resistance, and adhesion, whereas the solvent-free epoxy paint compositions of Comparative Examples 1 to 12 do not.

[0108] Specifically, in the case of Comparative Example 1, in which a monofunctional reactive diluent was used instead of a difunctional reactive diluent, it can be seen that not only is the drying time longer compared to Examples 1 to 7, but the corrosion resistance, cathodic peel resistance, abrasion resistance, and adhesion of the coating film are also poor.

[0109] In addition, when examining Comparative Examples 2 to 5, in which feldspar, muscovite, barium sulfate, and silica were used respectively instead of talc as extenders, it can be seen that Comparative Examples 2, 4, and 5 have significantly lower corrosion resistance and cathodic peel resistance, and Comparative Example 3 has significantly lower spray workability.

[0110] Also, D 50 Comparative Examples 6 to 7 and 9, in which talc of less than 8 μm was used, were found to have significantly reduced sprayability; in particular, Comparative Example 9, in which less epoxy resin was used compared to the Examples and Comparative Example 7 and instead the talc content was increased, showed the worst sprayability. D 50 Comparative Example 8, in which talc exceeding 15㎛ was used, was found to have reduced corrosion resistance and cathodic peel resistance.

[0111] Meanwhile, through Comparative Examples 10 to 12, it can be confirmed that even when a difunctional reactive diluent is used, if it is used in an excess amount exceeding 15 weight%, not only the drying time of the composition but also the corrosion resistance, cathodic peel resistance, abrasion resistance, and adhesion of the coating film are all reduced.

Claims

1. A composition comprising an epoxy resin, a difunctional reactive diluent, an amine-based curing agent, and a extender pigment, and The above extender pigment is D 50 This includes talc with a thickness of 8㎛ to 15㎛, and A solvent-free epoxy paint composition having a content of 1% to 15% by weight based on the total weight of the composition, wherein the content of the above-mentioned difunctional reactive diluent is 1% to 15% by weight.

2. In Claim 1, A solvent-free epoxy paint composition in which the above epoxy resin is a bisphenol A type epoxy resin.

3. In Claim 1, A solvent-free epoxy paint composition in which the above-mentioned difunctional reactive diluent is one or more selected from the group consisting of 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, and neopentyl glycol diglycidyl ether.

4. In Claim 1, A solvent-free epoxy paint composition having an oil absorption amount of 21% to 30% of the above talc.

5. In Claim 1, Based on the total weight of the above composition, 20% to 50% by weight of the above epoxy resin; 1% to 15% by weight of the above-mentioned difunctional reactive diluent; 10% to 30% by weight of the above amine-based curing agent; and A solvent-free epoxy paint composition comprising 10% to 40% by weight of the above talc.

6. In Claim 1, A solvent-free epoxy paint composition comprising one or more selected from the group consisting of a silane compound, a thickener, and a dispersant.

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