KR101749307B1 - The environment-friendly corrosion prevention compositions for steel structures and constructing method using the same - Google Patents

Abstract

The present invention relates to an eco-friendly anticorrosive composition for a steel structure and a method of using the same.
The eco-friendly anticorrosive composition of a steel structure according to the present invention comprises a first composition forming a primer layer (20) formed on the surface of an iron structure (10); A second composition forming an intermediate layer (30) located on top of the primer layer (20); And a third composition forming a top layer (40) located on top of the intermediate layer (30), wherein the first composition is mixed with the first liquid and the first liquid to form the surface of the iron structure Wherein the second composition comprises an acrylic resin, water, a dispersant, an antifoaming agent, a surfactant, and a thickening agent, which are put into a mixing tank and uniformly mixed to prepare a third solution, And the third composition comprises a fourth liquid and a fifth liquid mixed with the fourth liquid to react and cure on the intermediate layer 30.
According to the present invention, it is possible to improve the properties such as corrosion resistance, chemical resistance, and high weather resistance by strengthening the surface of the iron structure and forming a physically and chemically stable coating film, ), It is possible to reduce environmental pollution, and it is possible to prevent the risk of fire and explosion accident due to the use of the oil paint, and to secure the safety of the workers to the maximum.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an eco-friendly anticorrosive composition for a steel structure and a method of constructing the same.

More particularly, the present invention relates to an eco-friendly corrosion inhibiting composition for steel structures, and more particularly, to an eco-friendly anticorrosive composition for reinforcing corrosion resistance, chemical resistance and high weather resistance of steel structures by strengthening the surface of steel structures and forming a stable, physically and chemically stable coating film Which is capable of improving the properties of the iron-based corrosion inhibiting composition, and a method of using the same.

Generally, concrete has good compressive strength, and is resistant to acid resistance, alkali resistance, chemical resistance, ultraviolet rays, etc. However, as the use period elapses, the strength of the concrete decreases due to impurities such as acid / alkali and organic matters, When cracks occur due to external cracks, micro cracks and irregular cracks occur at the joints, cracks occur and leakage occurs. If the corrosion is intensified, the buried steel is also corroded and the durability of the structure is seriously degraded. There is a problem to damage.

Since most of the steel structures containing such iron are exposed to the corrosive environment, it is general to perform corrosion prevention treatment on the surface of the steel structure in order to improve durability. Corrosion of steel structures means that rust or red rust (Fe (OH) ₃ and Fe ₂ O ₃ ) are generated. The cause of these is oxygen (O ₂ ), moisture (H ₂ O) can see. Such corrosion tends to be accelerated by contaminated atmospheres, soot, seawater salinity, acid rain, chemicals (acids, alkalis and salts).

As a method for suppressing the corrosion of the iron structure as described above, there is a method of suppressing the corrosion of the iron structure by using a rustproof pigment such as zinc oxide or zinc chromate which is passivated when the water touches the metal by the reaction inhibiting function, A sacrificial anode using metal pigments such as zinc having a tendency to ionize more than iron in a cathodic manner, or the like is used, or the like is used have.

Korean Patent No. 503,561 discloses a coating composition for corrosion prevention and durability improvement of iron structures and an aluminum oxide coating method using the coating composition. The coating composition is coated with a paint using zinc, chromium, nickel, aluminum oxide, A method of forming a magnetic recording medium is disclosed. However, when heavy metals such as chromium and lead are contained in order to improve the rust-preventive function of the paint, it can be absorbed by the human body through the respiratory or skin, causing serious problems, and is not preferable from the environmental viewpoint. Especially, the paint which is used in the corrosion prevention method of existing steel structure is an oil based paint using organic solvent containing volatile organic compounds (VOCs). There is a risk of poisoning by a volatile organic solvent and fire occurrence So that the safety of work is not ensured and there is a problem that it adversely affects the natural environment.

Korean Patent No. 910,983 discloses a method for forming a metal coating on a reinforcing bar or a steel structure by applying a water-soluble epoxy zinc rust-preventive coating material containing zinc powder, active ceramic powder and the like as an environmentally friendly coating method for steel bars and steel structures have. However, since the zinc powder contained in the water-soluble epoxy generally generates a gas when it comes into contact with moisture, it may cause instability in long-term storage stability and is not resistant to chemical resistance such as acid resistance.

On the other hand, Korean Patent No. 896,080 discloses a water-soluble anti-corrosive coating material using zinc phosphate powder as a water-soluble epoxy corrosion inhibitor coating composition. However, since the zinc phosphate powder is weak in chemical resistance such as acid resistance and the like, it is not preferable when exposed to a corrosive environment for a long period of time, and has a short pot life, which may cause construction problems in summer construction.

Domestic registered patent No. 10-1209079 (registered on November 30, 2012) Korean Registered Patent No. 10-0503561 (registered on July 15, 2005)

The present invention relates to an eco-friendly anticorrosive composition for reinforcing the surface of a steel structure and improving the properties such as corrosion resistance, chemical resistance and high weather resistance by forming a coating film that is environmentally friendly and physically and chemically stable, .

Further, the present invention can reduce the environmental pollution by preventing the emission of volatile organic compounds (VOCs) into the atmosphere at the time of coating, and prevent the risk of fire and explosion accident caused by the use of the oil paint, And a method of using the same.

The present invention also relates to an eco-friendly anticorrosive composition of a steel structure capable of preventing deterioration and corrosion of a steel structure in the long term by coating the surface of the steel structure with a water-tight coating, And to provide a method of using them.

The various problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

The eco-friendly anticorrosive composition of a steel structure according to the present invention comprises a first composition forming a primer layer (20) formed on the surface of an iron structure (10); A second composition forming an intermediate layer (30) located on top of the primer layer (20); And a third composition forming a top layer (40) located on top of the intermediate layer (30), wherein the first composition is mixed with the first liquid and the first liquid to form the surface of the iron structure Wherein the second composition comprises an acrylic resin, water, a dispersant, an antifoaming agent, a surfactant, and a thickening agent, which are put into a mixing tank and uniformly mixed to prepare a third solution, And the third composition comprises a fourth liquid and a fifth liquid mixed with the fourth liquid to react and cure on the intermediate layer 30.

The first liquid is prepared by adding a self-emulsifying epoxy system resin, a thickener, a dispersant, a defoamer, a surfactant and water to a mixing tank to prepare a mixture, and adding a pigment and a filler to the mixture, 10 to 40 parts by weight of an emulsifying epoxy system resin, 0.2 to 1 part by weight of a thickener, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoaming agent, 0.1 to 0.4 part by weight of a surfactant and 10 to 40 parts by weight of water And the mixture is stirred for 8 to 12 minutes at a speed of 200 to 300 rpm using a stirrer to prepare a mixture. After adding the pigment and the filler to the mixture, the mixture is stirred at a speed of 500 to 1000 rpm for 25 to 35 minutes , And the second solution is prepared by mixing 5 to 10 parts by weight of a modified aliphatic polyamine with a curing agent resin and 2,4,6-trimethylaminomethylpiperazine 1 to 5 parts by weight, and the second liquid is used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the first liquid, and the third liquid is used in an amount of 30 to 60 parts by weight By weight of water, 5 to 10 parts by weight of water, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant and 0.2 to 1 part by weight of a thickener, A polyol resin, a dispersant, a defoaming agent, a surfactant, a thickener, and water are put into a mixing tank and uniformly mixed to prepare a mixture, the pigment is added to the mixture, and the mixture is stirred with a stirrer for a certain period of time. From 0.2 to 0.5 parts by weight of a dispersant, from 0.2 to 1 part by weight of a defoamer, from 0.1 to 0.4 part by weight of a surfactant, from 0.2 to 2 parts by weight of a thickener and from 2 to 5 parts by weight of water 15 to 20 parts by weight of pigment are added based on 100 parts by weight of the total weight of the mixed solution, and the mixture is homogeneously mixed at a rate of 500 to 1000 rpm using a stirrer The fifth solution is prepared by mixing 5 to 10 parts by weight of a modified aliphatic polyamine as a curing agent resin and 1 to 5 parts by weight of 2,4,6-tridymethylaminomethylphenol as a curing accelerator in a weight ratio of And the fifth solution may be used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the fourth solution.

The self-emulsifying epoxy system resin used in the first solution may have an epoxy equivalent of 180 to 220 g / eq, and the acrylic resin used in the third solution may include vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, butyl acetate, Hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, glycidyl acrylate, glycidyl acrylate, 2-hydroxyethyl acrylate, And glycidyl methacrylate may be polymerized by polymerizing one or two or more selected from the group consisting of glycidyl methacrylate and glycidyl methacrylate.

In addition, a method of constructing an iron structure according to the present invention using an environmentally friendly corrosion inhibiting composition may include forming a primer layer 20 on a surface of an iron structure 10 (S100); Forming an intermediate layer 30 on the primer layer 20 (S200); And forming a top layer (40) on top of the intermediate layer (30), wherein the primer layer (20) is prepared using a first composition, the intermediate layer (30) Wherein the top layer (40) is prepared using a third composition, wherein the first composition is mixed with the first liquid and the first liquid to cure at the surface of the iron structure (10) Wherein the second composition comprises an acrylic resin, water, a dispersing agent, a defoaming agent, a surfactant and a thickening agent in a mixing tank and uniformly mixing them to prepare a third solution, And the third composition comprises a fourth solution and a fifth solution mixed with the fourth solution to react and cure on the intermediate layer 30.

The first liquid is prepared by adding a self-emulsifying epoxy system resin, a thickener, a dispersant, a defoamer, a surfactant and water to a mixing tank to prepare a mixture, and adding a pigment and a filler to the mixture, 10 to 40 parts by weight of an emulsifying epoxy system resin, 0.2 to 1 part by weight of a thickener, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoaming agent, 0.1 to 0.4 part by weight of a surfactant and 10 to 40 parts by weight of water And the mixture is stirred for 8 to 12 minutes at a speed of 200 to 300 rpm using a stirrer to prepare a mixture. After adding the pigment and the filler to the mixture, the mixture is stirred at a speed of 500 to 1000 rpm for 25 to 35 minutes , And the second solution is prepared by mixing 5 to 10 parts by weight of a modified aliphatic polyamine with a curing agent resin and 2,4,6-trimethylaminomethylpiperazine 1 to 5 parts by weight, and the second liquid is used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the first liquid, and the third liquid is used in an amount of 30 to 60 parts by weight By weight of water, 5 to 10 parts by weight of water, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant and 0.2 to 1 part by weight of a thickener, A polyol resin, a dispersant, a defoaming agent, a surfactant, a thickener, and water are put into a mixing tank and uniformly mixed to prepare a mixture, the pigment is added to the mixture, and the mixture is stirred with a stirrer for a certain period of time. From 0.2 to 0.5 parts by weight of a dispersant, from 0.2 to 1 part by weight of a defoamer, from 0.1 to 0.4 part by weight of a surfactant, from 0.2 to 2 parts by weight of a thickener and from 2 to 5 parts by weight of water 15 to 20 parts by weight of pigment are added based on 100 parts by weight of the total weight of the mixed solution, and the mixture is homogeneously mixed at a rate of 500 to 1000 rpm using a stirrer The fifth solution is prepared by mixing 5 to 10 parts by weight of a modified aliphatic polyamine as a curing agent resin and 1 to 5 parts by weight of 2,4,6-trimethylaminomethylphenol as a curing accelerator in a weight ratio of And the fifth solution is used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the fourth solution. The self-emulsifying epoxy system resin used in the first solution has an epoxy equivalent of 180 to 220 g / eq, The acrylic resin used in the third solution may be selected from the group consisting of vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, butyl acetate, methyl methacrylate, 2- Hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, glycidyl acrylate, glycidyl acrylate, and glycidyl methacrylate. Or a combination of two or more selected from the group consisting of

The details of other embodiments are included in the detailed description.

The eco-friendly anticorrosive composition of the steel structure according to the present invention and the method of using the same can strengthen the surface of the iron structure and form a coating film which is environmentally friendly and physically and chemically stable to improve properties such as corrosion resistance, chemical resistance and high weatherability have.

In addition, the eco-friendly anticorrosive composition of the steel structure according to the present invention and the construction method using the same can prevent environmental pollution by preventing the emission of volatile organic compounds (VOCs) into the atmosphere at the time of coating, The risk of accidents can be prevented beforehand and the safety of workers can be maximized.

Also, the eco-friendly anticorrosive composition of the present invention and the method of using the anticorrosive composition according to the present invention can prevent deterioration and corrosion of the iron structure in the long term by coating the surface of the iron structure with water- .

It will be appreciated that embodiments of the technical idea of the present invention can provide various effects not specifically mentioned.

1 is a cross-sectional view schematically showing a cross section of a coated iron structure using an environmentally friendly corrosion inhibiting composition of a steel structure according to the present invention.
FIG. 2 is a flowchart illustrating a method of coating a steel structure using an environmentally-friendly corrosion inhibiting composition of a steel structure according to the present invention.

Advantages and features of the present invention, and methods of accomplishing the same, will be apparent from and elucidated with reference to the embodiments described hereinafter in detail. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be construed as ideal or overly formal in meaning unless explicitly defined in the present application Do not.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an eco-friendly anticorrosive composition of a steel structure according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view schematically showing a cross section of a coated iron structure using an environmentally friendly corrosion inhibiting composition of a steel structure according to the present invention. FIG. 2 is a cross- Fig. 6 is a flowchart for explaining a coating method for coating. Fig.

1 and 2, an eco-friendly anticorrosive composition of a steel structure according to the present invention comprises a first composition forming a primer layer 20 formed on the surface of a steel structure 10, And a third composition forming a top layer (40) located on top of the intermediate layer (30).

The first composition is a composition which is cured on the surface of the iron structure 10 to form a primer layer 20. The first composition is cured on the surface of the iron structure 10 to form a water- Various kinds of gases (for example, O ₂ , CO ₂ , NOx, SOx, etc.) that cause water (H ₂ O) or corrosion are brought into contact with the iron structure 10 by strengthening the surface of the iron structure 10 Thereby preventing deterioration and corrosion of the steel structure 10 in the long term.

In the present invention, the first composition comprises a first liquid and a second liquid which is mixed with the first liquid and cured at the surface of the iron structure (10).

Wherein the first liquid is mixed with a second liquid used as a curing agent, and the first liquid is a mixture of a self-emulsifying epoxy system resin, a thickener, a dispersant, a defoamer, a surfactant and water in a mixing tank, To prepare a mixture, and adding a pigment and a filler to the mixture.

The first liquid may be prepared by including a self-emulsifying epoxy system resin, a thickener, a dispersant, a defoaming agent, a surfactant, water, a pigment and a filler. 10 to 40 parts by weight of a thickener, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant, 10 to 40 parts by weight of water, 1.5 to 10 parts by weight of a pigment, May be used in a weight ratio of 20 to 50 parts by weight.

The self-emulsification type epoxy system is an epoxy resin having an active group capable of emulsifying itself. In the present invention, the self-emulsification type epoxy system may be a self-emulsifying type modified epoxy resin having an epoxy equivalent of 180 to 220 g / eq .

In general, water-soluble epoxy resins use a large amount of emulsifier, that is, a surfactant, in the emulsification process, so that physical properties such as strength, weatherability and water resistance of the coating film are remarkably lowered. DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention [ The self-emulsifying epoxy system has been developed to improve the physical properties such as strength, weatherability and water resistance of the coating film.

The self-emulsifying epoxy system resin is used in an amount of 10 to 40 parts by weight based on the entire composition of the first liquid. When the self-emulsifying epoxy system resin is contained in an amount of less than 10 parts by weight, And if it is contained in an amount exceeding 40 parts by weight, the drying may be delayed.

The thickening agent is used to increase the smoothness upon forming the coating film and to control the viscosity and fluidity of the first liquid. The thickener is used in an amount of 0.2 to 1 part by weight based on the entire composition of the first liquid. If it is contained in an amount of less than 0.2 part by weight, the viscosity of the first composition may be too low to cause problems in workability. If the amount of the first composition is more than 1 part by weight, smoothness may be deteriorated. In the present invention, the thickener used in the first liquid is preferably a water-soluble thickener. For example, any one selected from the group consisting of a modified silicate clay thickener, a water-soluble acrylic thickener, and an acrylic ester- have.

The dispersant is adsorbed on the surface of the pigment or the filler particles contained in the first liquid, and the gap between the pigment and the filler particles is kept constant by the electric repulsion force or the steric hindrance effect to prevent the particles from being re-agglomerated. For example, as the dispersing agent in the first liquid, at least one dispersing agent selected from the group consisting of a siloxane dispersant, a silicone dispersant, a monophosphate ester dispersant, a polyphosphoric acid ester dispersant, an acrylate copolymer dispersant and a modified silicone dispersant can be used .

The antifoaming agent is used for preventing the formation of bubbles in the first composition, and if the bubbles remain in the first composition, the adhesion of the antifoaming agent to the steel structure 10 or physical properties may be deteriorated. For example, as the defoaming agent in the first solution, at least one selected from a mineral oil defoaming agent, a silicone defoaming agent and a non-silicone type defoaming agent may be used in order to maximize the defoaming power.

The surfactant is used to improve the reactivity by adsorbing to the interface of the compositions used for preparing the first liquid by lowering the tension of the surface. For example, an alkylphenol surfactant, a cationic surfactant, an anionic A surfactant, a nonionic surfactant, and a polyether siloxane-based surfactant may be used, but the present invention is not limited thereto.

There in the pigment is an aluminum oxide may be used, in particular an average thickness of 0.5 to 1.5㎛, and an average particle size of the flake structure of 4.5 to 5㎛ circular, the aluminum oxide Al ₂ O ₃ greater than 99.5% may be used. In general, aluminum oxide has a high melting point, is resistant to heat, acid, and alkali, has high strength and is harmless to human body. Therefore, when aluminum oxide is used as a pigment, it can improve the chemical resistance, heat resistance and durability of a film in an environmentally friendly manner . In addition, in the present invention, the aluminum oxide has a circular flake structure to prevent the penetration of contaminants causing corrosion, and it can also secure heat resistance.

The filler has a function of improving thermal and physical strength, preventing abrasion, and affecting phosphorus, and improving the corrosion resistance, weatherability, and gloss. The filler includes silica, calcium carbonate, magnesium silicate , Calcium silicate, zinc phosphate, and barium sulfate, and preferably has an average particle diameter of 10 to 30 mu m.

In the present invention, the first liquid preferably comprises 10 to 40 parts by weight of a self-emulsifying epoxy system resin, 0.2 to 1 part by weight of a thickener, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant, 10 to 40 parts by weight of a pigment, 1.5 to 10 parts by weight of a pigment and 20 to 50 parts by weight of a filler. Specifically, 10 to 40 parts by weight of a self-emulsifying epoxy system resin, 0.2 to 1 part by weight of a thickener, 0.2 to 2 parts by weight of a dispersing agent, 0.2 to 1 part by weight of a defoaming agent, 0.1 to 0.4 parts by weight of a surfactant and 10 to 40 parts by weight of water are added to a mixing tank and stirred at a speed of 200 to 300 rpm Stirring the mixture for 8 to 12 minutes to prepare a mixture, adding the pigment and the filler to the mixture, and stirring the mixture at a speed of 500 to 1000 rpm for 25 to 35 minutes to prepare a first liquid .

The second liquid is a composition including a curing agent mixed with the first liquid and reacting and curing on the surface of the iron structure 10. In the present invention, the second solution may be a mixture of a curing agent resin and a curing accelerator have.

In the present invention, a modified aliphatic polyamine may be used as the curing resin, and 2,4,6-tridymethylaminomethylphenol may be used as the curing accelerator. The curing resin and the curing accelerator may be cured with a curing agent 10 parts by weight and 1 to 5 parts by weight of a curing accelerator.

In the present invention, the second solution may be prepared by stirring 5 to 10 parts by weight of a curing agent resin and 1 to 5 parts by weight of a curing accelerator and aging for 20 to 30 minutes.

The second liquid used as the curing agent is mixed with the first liquid of the self-emulsifying epoxy system and reacted. The water-tight coating film can be formed by curing the surface of the iron structure 10. In the present invention, The first liquid and the second liquid may be mixed to form the first composition, and the second liquid may be used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the first liquid.

The second composition is a composition for forming an intermediate layer 30 located on a primer layer 20 formed of a first composition. The intermediate layer 30 is formed on the primer layer 20, To a third liquid containing a pigment and a filler.

The third solution may be prepared by charging an acrylic resin, water, a dispersing agent, a defoaming agent, a surfactant, and a thickener into a mixing tank and then uniformly mixing the solution. The third solution may be prepared by mixing 30 to 60 parts by weight of an acrylic resin, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant and 0.2 to 1 part by weight of a thickener.

The acrylic resin may be prepared by polymerizing an acrylic monomer, and the acrylic monomer may impart main functions such as mechanical properties of the composition, bonding strength between the resins, adhesion and durability. Examples of the acrylic monomer include vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, butyl acetate, methyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, Acrylate, 2-hydroxypropyl methacrylate, glycidyl acrylate, glycidyl acrylate, and glycidyl methacrylate may be polymerized by polymerizing at least one selected from the group consisting of hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, glycidyl acrylate, glycidyl acrylate and glycidyl methacrylate.

When the content of the acrylic resin is less than 30 parts by weight, the flowability and workability due to the viscosity increase of the composition may be increased. If the content is more than 60 parts by weight, the mechanical properties of the coating film formed by the curing are remarkably lowered, resulting in deterioration of workability and film strength.

The dispersant may be included to control the viscosity of the composition contained in the third liquid so that the particles of the compositions contained in the composition are dispersed and uniformly applied on the primer layer 20.

If the amount of the dispersing agent is less than 0.2 parts by weight, the composition of the third liquid may be miscible due to a lack of the dispersing agent. It is not dispersed uniformly on the primer layer 20, and when it exceeds 2 parts by weight, the dispersion effect does not increase in proportion to the increase of the dispersant content. In the present invention, the dispersant may be a mixture of one or more dispersants selected from the group consisting of a monophosphate ester dispersant, a polyphosphate dispersant, an acrylate copolymer dispersant and a modified silicone dispersant, but is not limited thereto.

The antifoaming agent is added to prevent the formation of bubbles. The antifoaming agent may be selected from a mineral oil type antifoaming agent, a silicone type antifoaming agent and a non-silicone type antifoaming agent. Examples thereof include polyoxyalkylenes, (poly) oxyalkyl ethers (Poly) oxyalkylene sorbitan fatty acid esters, (poly) oxyalkylene alkyl (aryl) ether sulfuric acid ester salts, (poly) oxyalkylene sorbitan fatty acid esters, Oxyalkylene antifoaming agents such as phosphoric acid esters, (poly) oxyalkylene alkylamines, (poly) oxyalkylene amides and the like; Alcohol-based antifoaming agents such as octyl alcohol, hexadecyl alcohol, acetylene alcohol, glycols and the like; Amide-based antifoaming agents such as acrylate polyamines and the like; Phosphoric acid ester antifoaming agents such as tributyl phosphate, sodium octyl phosphate and the like; Metal soap defoamers such as aluminum stearate, calcium oleate and the like; Silicone defoaming agents such as dimethyl silicone oil, silicone paste, silicone emulsion, organic modified polysiloxane (polyorganosiloxane such as dimethylpolysiloxane), fluorosilicone oil and the like can be used, but not always limited thereto.

In the present invention, the defoaming agent improves the wettability of the second composition to improve adhesion to the primer layer 20 and the steel structure 10, and removes bubbles during the production of the second composition, thereby improving the appearance and denseness And can be used to improve durability.

In the present invention, the defoaming agent may be contained in an amount of 0.2 to 1 part by weight based on the total amount of the third solution. When the defoaming agent is contained in an amount of less than 0.2 part by weight, the defoaming effect may be deteriorated during the production of the third solution. If it exceeds the weight part, the bubble effect is no longer significantly improved and other physical properties of the third liquid can be lowered.

The surfactant is used for improving the reactivity by adsorbing to the interface of the compositions used for preparing the third liquid by lowering the tension of the surface. For example, an alkylphenol surfactant, a cationic surfactant, an anionic A surfactant, a nonionic surfactant, and a polyether siloxane-based surfactant may be used, but the present invention is not limited thereto.

The thickener may be added to prevent the flow of the coating film during coating, to prevent sedimentation of the pigment or filler in the coating, and to maintain the stable dispersion state of the pigment by controlling the viscosity and fluidity of the third liquid. As the thickener, a known thickener may be used, for example, a water dispersible acrylic ester-acrylic acid copolymer may be used as the thickener.

The pigment functions to fill pores in the coated film and to control the complement and gloss of hardness, film formation, etc. The pigment may be used in an amount of 1.5 to 10 parts by weight based on 100 parts by weight of the third liquid.

As the pigment in the present invention, for example, at least one selected from calcium carbonate, clay, talc, magnesium silicate, kaolin, mica, silica, aluminum silicate, aluminum hydroxide, barium sulfate, barium sulfate and mixtures thereof Not only a good appearance of the coating film can be obtained, but also hardness, impact resistance, rustproofing property and the like can be improved.

The filler improves thermal and physical strength, prevents abrasion and affects phosphorus, imparts a function of improving corrosion resistance, weatherability, and gloss, and enhances the heat shielding function by preventing the paint film from being deteriorated or being deteriorated by long- The filler may be used in an amount of 30 to 50 parts by weight based on 100 parts by weight of the third solution.

Examples of the filler include Illite-Mica, Zeolite, Silica, Elvanite, Olivine, Kaolin, Silica Mineral, Diatomite, Wollastonite, Pyrophyllite, Dolomite, Lithium Minerals, Magnesite, Bauxite, Bentonite, Pumice, Borate, Borate, Carbonate Minerals, Attapulgite, Sepiolite, Nephrite, Apatite, Acid Clay, Iron Oxide, Garnet, Carbonate Minerals, Clay Minerals), feldspar, perlite, vermiculite, barite, talc, diatomaceous earth, graphite, hectorite, clay minerals, Zirconium Minerals, Titanium Minerals, Tourmaine, Air, Gel (Aerogel), from fly Ashton (Fly ash) and blast furnace slag powder can be used alone or in combination.

In the present invention, the second composition is prepared by adding an acrylic resin, water, a dispersing agent, an antifoaming agent, a surfactant and a thickening agent to a mixing tank to uniformly mix the mixture to prepare a third solution, mixing the third solution with a pigment and a filler Specifically, 30 to 60 parts by weight of an acrylic resin, 5 to 10 parts by weight of water, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoaming agent, 0.1 to 0.4 parts by weight of a surfactant and 0.2 to 1 part by weight of a thickener And the mixture is charged into a mixing tank to prepare a third solution. From the first solution, 1.5 to 10 parts by weight of the pigment and 30 to 50 parts by weight of the filler are added based on 100 parts by weight of the third solution to prepare a mixed solution The above mixed solution is uniformly stirred at a speed of 500 to 1000 rpm using a stirrer to prepare a second composition.

The third composition is a composition for forming an upper layer (40) positioned on the intermediate layer (30) formed of the second composition. In the present invention, the third composition is a mixture of the fourth solution and the fourth solution And a fifth solution which reacts and cures on the intermediate layer 30.

The fourth liquid is mixed with a fifth liquid used as a curing agent, and the fourth liquid is prepared by charging an acrylic polyol resin, a dispersant, a defoamer, a surfactant, a thickener and water into a mixing tank, , Adding a pigment to the mixture, and stirring the mixture with a stirrer for a certain period of time.

The acrylic polyol resin is a water-soluble resin having a hydroxyl functional group (OH). The acrylic polyol resin reacts with isocyanate used as a curing agent to be described later, And the coating is cured on the top to form a coating film of a network-like structure.

In the present invention, the acrylic polyol resin contains a hydroxyl group. For example, the acrylic polyol resin may contain 30 to 40 parts by weight of water, 1 to 2 parts by weight of a polymerization initiator, 10 to 20 parts by weight of an acrylic monomer, 2 to 3 parts by weight of an acrylic monomer and 10 to 15 parts by weight of an acrylic monomer are reacted to prepare a water-soluble acrylic polyol resin.

In the present invention, the acrylic monomer may be any one selected from the group consisting of 2-hydroxyacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate and hydroxypropyl methacrylate Acrylic acid and methacrylic acid, and the above-mentioned acrylic monomer having carboxyl group may be selected from the group consisting of acrylic acid, methacrylic acid and maleic acid. The amide-based acrylic monomer may be selected from the group consisting of acrylamide, N-methylol acrylamide and diacetone Acrylamide may be used.

The polymerization initiator may be at least one selected from the group consisting of highly reactive benzoyl peroxide, t-butyl peroxide, and potassium per sulfate (KPS). Preferably, the polymerization initiator is a water- Persulfate can be used.

In the present invention, the fourth solution is prepared by adding an acrylic polyol resin, a dispersant, a defoamer, a surfactant, a thickener and water into a mixing tank and uniformly mixing them to prepare a mixture. After adding the pigment to the mixture, Specifically, 30 to 70 parts by weight of the acrylic polyol resin, 0.2 to 0.5 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant, 0.2 to 2 parts by weight of a thickener, And the mixture is uniformly mixed to prepare a mixed solution. After adding 15 to 20 parts by weight of the pigment based on 100 parts by weight of the total weight of the mixed solution, the mixture is stirred for 500 - And uniformly stirred at a speed of 1000 rpm to prepare a fourth liquid.

As described above, the acrylic polyol resin used in the fourth solution is prepared by mixing 30 to 40 parts by weight of water, 1 to 2 parts by weight of a polymerization initiator, 10 to 20 parts by weight of an acrylic monomer, 2 to 3 parts by weight of an acrylic monomer having a carboxyl group, Based acrylic monomer at a weight ratio of 10 to 15 parts by weight to prepare a water-soluble acrylic polyol resin.

The dispersant used in the fourth liquid may be included to adjust the viscosity of the composition contained in the fourth liquid so that the particles of the compositions contained in the composition are dispersed and uniformly applied on the surface of the intermediate layer 30 .

When the dispersant is contained in an amount of less than 0.2 part by weight, the composition of the fourth liquid may be poorly dispersed due to a shortage of the dispersant content. It is not dispersed and is not uniformly applied on the intermediate layer 30, and when it is contained in an amount exceeding 0.5 parts by weight, the dispersing effect does not increase in proportion to the increase of the dispersant content. In the present invention, the dispersant may be a mixture of one or more dispersants selected from the group consisting of a monophosphate ester dispersant, a polyphosphate dispersant, an acrylate copolymer dispersant and a modified silicone dispersant, but is not limited thereto.

The antifoaming agent is added to prevent the formation of bubbles. The antifoaming agent may be selected from a mineral oil type antifoaming agent, a silicone type antifoaming agent and a non-silicone type antifoaming agent. Examples thereof include polyoxyalkylenes, (poly) oxyalkyl ethers (Poly) oxyalkylene sorbitan fatty acid esters, (poly) oxyalkylene alkyl (aryl) ether sulfuric acid ester salts, (poly) oxyalkylene sorbitan fatty acid esters, Oxyalkylene antifoaming agents such as phosphoric acid esters, (poly) oxyalkylene alkylamines, (poly) oxyalkylene amides and the like; Alcohol-based antifoaming agents such as octyl alcohol, hexadecyl alcohol, acetylene alcohol, glycols and the like; Amide-based antifoaming agents such as acrylate polyamines and the like; Phosphoric acid ester antifoaming agents such as tributyl phosphate, sodium octyl phosphate and the like; Metal soap defoamers such as aluminum stearate, calcium oleate and the like; Silicone defoaming agents such as dimethyl silicone oil, silicone paste, silicone emulsion, organic modified polysiloxane (polyorganosiloxane such as dimethylpolysiloxane), fluorosilicone oil and the like can be used, but not always limited thereto.

In the present invention, the antifoaming agent improves the wettability of the fourth liquid to improve the adhesion to the intermediate layer 30 and removes the air bubbles during the production of the fourth liquid to improve the appearance and the denseness of the coating film to improve the durability Can be used.

In the present invention, the defoaming agent may include 0.2 to 1 part by weight of the total amount of the fourth liquid. When the defoaming agent is contained in an amount of less than 0.2 part by weight, the defoaming effect may be deteriorated during the production of the fourth liquid. If it exceeds the weight part, the effect of the antifoam is not remarkably improved any more and the other properties of the fourth liquid can be lowered.

The surfactant is used for improving the reactivity by adsorbing to the interface of the compositions used for preparing the fourth liquid by lowering the tension of the surface. For example, an alkylphenol surfactant, a cationic surfactant, an anionic A surfactant, a nonionic surfactant, and a polyether siloxane-based surfactant may be used, but the present invention is not limited thereto.

The thickener may be added to control the viscosity and flowability of the fourth liquid to prevent the flow of the coating film during coating, prevent the deposition of the pigment in the coating, and maintain the stable dispersion state of the pigment. As the thickener, a known thickener may be used, for example, a water dispersible acrylic ester-acrylic acid copolymer may be used as the thickener.

The pigment plays a role of adjusting the hardness, coating film formation, etc. and controlling the gloss. Examples of the pigment include calcium carbonate, clay, talc, magnesium silicate, kaolin, mica, silica, aluminum silicate, Side, barium sulfate, barium sulfate, and mixtures thereof, not only a good coating film appearance can be obtained, but also hardness, impact resistance, rust prevention and the like can be improved.

The fifth liquid is a composition including a curing agent which is mixed with the fourth liquid to react and cure on the intermediate layer 30. In the present invention, the fifth liquid may be a mixture of a curing agent resin and a curing accelerator .

In the present invention, a modified aliphatic polyamine may be used as the curing resin, and 2,4,6-tridymethylaminomethylphenol may be used as the curing accelerator. The curing resin and the curing accelerator may be cured with a curing agent 10 parts by weight and 1 to 5 parts by weight of a curing accelerator.

In the present invention, the second solution may be prepared by stirring 5 to 10 parts by weight of a curing agent resin and 1 to 5 parts by weight of a curing accelerator and aging for 20 to 30 minutes.

The fifth liquid used as the curing agent is mixed with the acrylic polyol resin and reacted to form a top layer 40 having a network structure by curing on the middle layer 30. In the present invention, The fourth solution and the fifth solution may be mixed to form the third composition, and the fifth solution may be used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the fourth solution.

If the acrylic polyol resin is contained in the composition forming the fourth liquid at a temperature lower than the above lower limit, the surface strengthening effect of the upper layer 40 is remarkably lowered. If the upper limit is exceeded, The surface strengthening effect of the top layer 40 may be deteriorated due to the decrease of the relative content and the flowability and workability may be deteriorated due to the viscosity increase during stirring.

Hereinafter, a method of constructing an iron structure using the eco-friendly corrosion inhibiting composition of a steel structure according to the present invention will be described in detail with reference to the accompanying drawings.

First, the primer layer 20 formed on the surface of the steel structure 10 can be formed. (Step S100 of forming the primer layer)

The primer layer 20 may be prepared using a first composition comprising a first liquid and a second liquid which is mixed with the first liquid to react and cure within the steel structure 10, . The first liquid is a mixture of a self-emulsifying epoxy system resin, a thickener, a dispersant, a defoamer, a surfactant, and water in a mixing tank, To prepare a mixture, and adding a pigment and a filler to the mixture.

That is, in the present invention, the first liquid preferably comprises 10 to 40 parts by weight of a self-emulsifiable epoxy system resin, 0.2 to 1 part by weight of a thickener, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 10 to 40 parts by weight of water, 1.5 to 10 parts by weight of pigment and 20 to 50 parts by weight of a filler. Specifically, 10 to 40 parts by weight of a self-emulsifying epoxy system resin, 0.2 to 1 part by weight of a thickener 0.2 to 2 parts by weight of a dispersing agent, 0.2 to 1 part by weight of a defoaming agent, 0.1 to 0.4 parts by weight of a surfactant and 10 to 40 parts by weight of water are added to a mixing tank and stirred at 200 to 300 rpm At a speed of 8 to 12 minutes to prepare a mixture, adding a pigment and a filler to the mixture, and then stirring the mixture at a speed of 500 to 1000 rpm for 25 to 35 minutes to prepare a first liquid have.

The second liquid is a composition comprising a curing agent mixed with the first liquid and reacting and curing on the surface of the iron structure 10. In the present invention, the second liquid may be a mixture of a curing agent resin and a curing accelerator , A modified aliphatic polyamine may be used as the curing agent resin, and 2,4,6-trimethylaminomethylphenol may be used as the curing accelerator. The curing agent resin and the curing accelerator may be used in an amount of 5 to 10 parts by weight And 1 to 5 parts by weight of a curing accelerator. The second liquid may be used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the first liquid.

Next, the intermediate layer 30 may be formed on the primer layer 20 (intermediate layer formation step S200).

The intermediate layer 30 may be prepared using a second composition, which is prepared by charging an acrylic resin, water, a dispersant, a defoamer, a surfactant, and a thickener into a mixing tank, Specifically, 30 to 60 parts by weight of an acrylic resin, 5 to 10 parts by weight of water, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoaming agent 0.1 to 0.4 parts by weight of a surfactant, and 0.2 to 1 part by weight of a thickener, and the mixture is added to a mixing tank to prepare a third liquid. A pigment is added in an amount of 1.5 to 10 wt% based on 100 parts by weight of the third liquid And 30 to 50 parts by weight of a filler are added to prepare a mixed solution, and the mixed solution is uniformly stirred at a speed of 500 to 1000 rpm using a stirrer to prepare a second composition.

Wherein the acrylic resin is selected from the group consisting of vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, butyl acetate, methyl methacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2- Acrylate, 2-hydroxypropyl methacrylate, glycidyl acrylate, glycidyl acrylate, and glycidyl methacrylate.

The pigment functions to fill pores in the coated film and to control the complement and gloss of hardness, film formation, etc. The pigment may be used in an amount of 1.5 to 10 parts by weight based on 100 parts by weight of the third liquid.

As the pigment in the present invention, for example, at least one selected from calcium carbonate, clay, talc, magnesium silicate, kaolin, mica, silica, aluminum silicate, aluminum hydroxide, barium sulfate, barium sulfate and mixtures thereof Not only a good appearance of the coating film can be obtained, but also hardness, impact resistance, rustproofing property and the like can be improved.

The filler improves thermal and physical strength, prevents abrasion and affects phosphorus, imparts a function of improving corrosion resistance, weatherability, and gloss, and enhances the heat shielding function by preventing the paint film from being deteriorated or being deteriorated by long- The filler may be used in an amount of 30 to 50 parts by weight based on 100 parts by weight of the third solution.

Examples of the filler include Illite-Mica, Zeolite, Silica, Elvanite, Olivine, Kaolin, Silica Mineral, Diatomite, Wollastonite, Pyrophyllite, Dolomite, Lithium Minerals, Magnesite, Bauxite, Bentonite, Pumice, Borate, Borate, Carbonate Minerals, Attapulgite, Sepiolite, Nephrite, Apatite, Acid Clay, Iron Oxide, Garnet, Carbonate Minerals, Clay Minerals), feldspar, perlite, vermiculite, barite, talc, diatomaceous earth, graphite, hectorite, clay minerals, Zirconium Minerals, Titanium Minerals, Tourmaine, Air, Gel (Aerogel), from fly Ashton (Fly ash) and blast furnace slag powder can be used alone or in combination.

Then, a top coat layer 40 may be formed on the intermediate coat layer 30. (Upper layer forming step S300)

In the present invention, the top layer 40 may be prepared using a third composition, which is mixed with the fourth solution and the fourth solution to react and cure on the intermediate layer 30 And the fifth solution.

Here, the fourth solution is prepared by adding an acrylic polyol resin, a dispersing agent, a defoamer, a surfactant, a thickener and water into a mixing tank and then uniformly mixing the mixture to prepare a mixture. After the pigment is added to the mixture, Specifically, 30 to 70 parts by weight of the acrylic polyol resin, 0.2 to 0.5 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant, 0.2 to 2 parts by weight of a thickener, To 5 parts by weight, and the mixture is uniformly mixed to prepare a mixed solution. After adding 15 to 20 parts by weight of the pigment based on 100 parts by weight of the mixed liquid as a whole, the mixture is stirred at 500 to 1000 rpm At a rate of 10 < [deg.] ≫ C / sec.

The fifth solution may be a mixture of the fourth solution and a curing agent that reacts and cures on the intermediate layer 30. In the present invention, the fifth solution may be a mixture of a curing agent and a curing accelerator. As the curing agent resin, a modified aliphatic polyamine may be used. As the curing accelerator, 2,4,6-trimethylaminomethylphenol may be used. The curing agent resin and the curing accelerator may be used in an amount of 5 to 10 parts by weight, And 1 to 5 parts by weight of a curing accelerator.

That is, the fifth solution used as the curing agent is mixed with the acrylic polyol resin and reacted to form an upper layer 40 having a network structure by curing on the intermediate layer 30. In the present invention, The fourth solution may be mixed with the fifth solution to form the third composition, and the fifth solution may be used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the fourth solution.

Hereinafter, embodiments of the method of using the eco-friendly corrosion inhibiting composition of the iron structure according to the present invention will be described in more detail, but the technical idea of the present invention is not limited by the following examples.

<Examples>

First, the surface of the iron structure was cleaned and prepared, and then a primer layer was formed on the iron structure.

In order to form the first composition, 20 parts by weight of a self-emulsifying epoxy system resin, 0.5 parts by weight of a thickener, 1 part by weight of a dispersant, 0.5 parts by weight of a defoamer , 0.3 parts by weight of a surfactant and 30 parts by weight of water, and the resulting mixture was added to a mixing tank. The mixture was stirred at a speed of 250 rpm for 10 minutes using a stirrer to prepare a mixture. A pigment and a filler were added to the mixture And then stirred at a speed of 700 rpm for 30 minutes to prepare a first liquid. Based on 100 parts by weight of the first liquid, the modified aliphatic polyamine, which is a curing agent resin, and the 2,4,6-tridymethylaminomethyl Phenol in a weight ratio of 7: 3 were mixed.

Next, a middle layer was formed on the primer layer.

The intermediate layer was prepared by applying a second composition to the surface of the primer layer. To form the second composition, 45 parts by weight of acrylic resin, 7 parts by weight of water, 1 part by weight of dispersant, 0.5 part by weight of defoamer, 0.2 And 0.5 part by weight of a thickener were added to a mixing tank to prepare a third solution. 5 parts by weight of pigment and 40 parts by weight of a filler were added to prepare a mixed solution based on 100 parts by weight of the third solution. Then, the mixed solution was uniformly stirred at a speed of 700 rpm using a stirrer to prepare a second composition.

Subsequently, a top layer was formed on the intermediate layer.

The third composition was prepared by coating 60 parts by weight of an acrylic polyol resin, 0.3 parts by weight of a dispersant, 0.5 parts by weight of a defoamer, 0.3 parts by weight of a surfactant, 1 part by weight of a thickener And 3 parts by weight of water. The mixture was then uniformly mixed to prepare a mixed solution. 18 parts by weight of the pigment was added based on 100 parts by weight of the total weight of the mixed solution, and the mixture was stirred at a speed of 800 rpm And a fourth solution was prepared by mixing the first solution and the fourth solution. The fourth solution was prepared by mixing a modified aliphatic polyamine as a curing agent resin and 2,4,6-tridymethylaminomethylphenol as a curing accelerator in a weight ratio of 7: 3 Was mixed with 20 parts by weight of the mixture.

&Lt; Comparative Example 1 &

In Comparative Example 1, a primer layer was not formed in Comparative Example 1, but only a middle layer and an upper layer were formed on the iron structure by using the same components as those of Example 1.

&Lt; Comparative Example 2 &

In Comparative Example 2, the primer layer and the intermediate layer were not formed in Comparative Example 2, but only the upper layer was formed on the iron structure by using the same components as those of Example 1.

The following test examples are experimental results in which characteristics of the embodiments of the present invention are compared with those of Comparative Examples 1 and 2 in order to more easily grasp the characteristics of the embodiments according to the present invention.

&Lt; Test Example 1 >

The stability, surface hardness, water resistance, adhesion and peelability in a standard state were measured after forming a coating film layer on the surface of a sample of an iron structure as in the methods of Examples and Comparative Examples 1 and 2, Table 1 shows the results.

Example Comparative Example 1 Comparative Example 2 Stability (kg / f) 1206 921 853 Surface hardness no problem weakness weakness Water resistance (%) 99% 89% 83% Attachment good middle Poor Peelability Peeling off Slight peeling Slight peeling

As shown in the above Table 1, it was confirmed that the example in which the iron structure was applied using the coating liquid composition according to the present invention was not only easy to peel off from the surface but also had excellent water resistance and adhesion, and was also excellent in stability .

&Lt; Test Example 2 &

(1) Evaluation of surface hardness

The pencil hardness was measured according to KS D 6711.

(2) Water resistance evaluation

The time at which surface deformation (cracks, blisters, etc.) occurred continuously in 90 ° C hot water was measured.

The evaluation results are shown in Table 2.

Example Comparative Example 1 Comparative Example 2 Surface hardness 4H 3H 3H Water resistance 600hr 430hr 310hr

As shown in the above Table 2, it was confirmed that the examples in which the iron structure was applied using the coating liquid composition according to the present invention were significantly superior in surface hardness and water resistance to those in Comparative Examples 1 and 2. Accordingly, when the iron structure is coated using the coating liquid composition according to the present invention, it can be confirmed that the rustproofing property and the durability can be improved.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be possible. It is therefore to be understood that one embodiment described above is illustrative in all aspects and not restrictive.

10; Steel structure
20; Primer layer
30; Middle floor
40; Top layer

Claims (5)

A first composition forming a primer layer (20) formed on the surface of the iron structure (10);
A second composition forming an intermediate layer (30) located on top of the primer layer (20); And
And a third composition forming a top layer (40) located on top of the intermediate layer (30)
The first composition comprises a first liquid and a second liquid mixed with the first liquid and curing at the surface of the iron structure (10)
The second composition is prepared by mixing an acrylic resin, water, a dispersant, a defoamer, a surfactant, and a thickener into a mixing tank to uniformly mix the mixture to prepare a third solution, and mixing the third solution with a pigment and a filler.
The third composition comprises a fourth solution and a fifth solution mixed with the fourth solution to react and cure above the intermediate layer 30,
The first liquid is prepared by adding a self-emulsifying epoxy system resin, a thickener, a dispersant, a defoamer, a surfactant and water to a mixing tank to prepare a mixture, and adding a pigment and a filler to the mixture, 10 to 40 parts by weight of an emulsifying epoxy system resin, 0.2 to 1 part by weight of a thickener, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoaming agent, 0.1 to 0.4 part by weight of a surfactant and 10 to 40 parts by weight of water And the mixture is stirred for 8 to 12 minutes at a speed of 200 to 300 rpm using a stirrer to prepare a mixture. After adding the pigment and the filler to the mixture, the mixture is stirred at a speed of 500 to 1000 rpm for 25 to 35 minutes , And the self-emulsifying epoxy system resin used for the first liquid has an epoxy equivalent of 180 to 220 g / eq. As the pigment, Doedoe minyum is used, and an average thickness of 0.5 to 1.5㎛, and an average particle size of the flake structure of 4.5 to 5㎛ circular, Al ₂ O ₃ is more than 99.5% aluminum oxide is used, the filler is silica, calcium carbonate, magnesium Silicate, calcium silicate, zinc phosphate and barium sulfate, and has an average particle diameter of 10 to 30 占 퐉,
Wherein the second liquid is a mixture of 5 to 10 parts by weight of a modified aliphatic polyamine as a curing agent resin and 1 to 5 parts by weight of 2,4,6-trimethylaminomethylphenol as a curing accelerator, 10 to 50 parts by weight of the first liquid is used, 10 to 50 parts by weight of the second liquid is used, and 5 to 10 parts by weight of the curing agent and 1 to 5 parts by weight of the curing accelerator are added and stirred for 20 to 30 minutes &Lt; / RTI &gt;
Wherein the third solution contains 30 to 60 parts by weight of an acrylic resin, 5 to 10 parts by weight of water, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant and 0.2 to 1 part by weight of a thickener And the acrylic resin used in the third solution is selected from the group consisting of vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, butyl acetate, methyl methacrylate, 2-hydroxyethyl acrylate, 2- One or more selected from the group consisting of methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, glycidyl acrylate, glycidyl acrylate and glycidyl methacrylate, Wherein the pigment to be mixed with the third liquid is selected from the group consisting of calcium carbonate, clay, talc, magnesium silicate, kaolin, Using the Jamaica, silica, aluminum silicate, aluminum hydroxide, barium sulfate, barium sulfate and at least one selected from a mixture thereof, and
The fourth solution is prepared by adding an acrylic polyol resin, a dispersing agent, a defoaming agent, a surfactant, a thickener and water into a mixing tank and then uniformly mixing them to prepare a mixture. After the pigment is added to the mixture, Wherein the acrylic polyol resin is used in an amount of 30 to 70 parts by weight, 0.2 to 0.5 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant, 0.2 to 2 parts by weight of a thickener and 2 to 5 parts by weight of water And the mixture was uniformly mixed to prepare a mixed solution. 15 to 20 parts by weight of pigment were added based on 100 parts by weight of the total weight of the mixed solution, and the mixture was uniformly stirred at a speed of 500 to 1000 rpm using a stirrer Manufactured,
Wherein the fifth solution is a mixture of 5 to 10 parts by weight of a modified aliphatic polyamine as a curing agent resin and 1 to 5 parts by weight of 2,4,6-trimethylaminomethylphenol as a curing accelerator, Wherein the solution is used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the fourth liquid.
delete delete Forming a primer layer (20) on the surface of the steel structure (10) (S100);
Forming an intermediate layer 30 on the primer layer 20 (S200); And
And forming a top layer (40) on the intermediate layer (30) (S300)
The primer layer 20 is prepared using a first composition, the intermediate layer 30 is prepared using a second composition, the top layer 40 is prepared using a third composition,
The first composition comprises a first liquid and a second liquid mixed with the first liquid and curing at the surface of the iron structure (10)
The second composition is prepared by mixing an acrylic resin, water, a dispersant, a defoamer, a surfactant, and a thickener into a mixing tank to uniformly mix the mixture to prepare a third solution, and mixing the third solution with a pigment and a filler.
The third composition comprises a fourth solution and a fifth solution mixed with the fourth solution to react and cure above the intermediate layer 30,
The first liquid is prepared by adding a self-emulsifying epoxy system resin, a thickener, a dispersant, a defoamer, a surfactant and water to a mixing tank to prepare a mixture, and adding a pigment and a filler to the mixture, 10 to 40 parts by weight of an emulsifying epoxy system resin, 0.2 to 1 part by weight of a thickener, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoaming agent, 0.1 to 0.4 part by weight of a surfactant and 10 to 40 parts by weight of water And the mixture is stirred for 8 to 12 minutes at a speed of 200 to 300 rpm using a stirrer to prepare a mixture. After adding the pigment and the filler to the mixture, the mixture is stirred at a speed of 500 to 1000 rpm for 25 to 35 minutes , And the self-emulsifying epoxy system resin used for the first liquid has an epoxy equivalent of 180 to 220 g / eq. As the pigment, Doedoe minyum is used, and an average thickness of 0.5 to 1.5㎛, and an average particle size of the flake structure of 4.5 to 5㎛ circular, Al ₂ O ₃ is more than 99.5% aluminum oxide is used, the filler is silica, calcium carbonate, magnesium Silicate, calcium silicate, zinc phosphate and barium sulfate, and has an average particle diameter of 10 to 30 占 퐉,
Wherein the second liquid is a mixture of 5 to 10 parts by weight of a modified aliphatic polyamine as a curing agent resin and 1 to 5 parts by weight of 2,4,6-trimethylaminomethylphenol as a curing accelerator, 10 to 50 parts by weight of the first liquid is used, 10 to 50 parts by weight of the second liquid is used, and 5 to 10 parts by weight of the curing agent and 1 to 5 parts by weight of the curing accelerator are added and stirred for 20 to 30 minutes &Lt; / RTI &gt;
Wherein the third solution contains 30 to 60 parts by weight of an acrylic resin, 5 to 10 parts by weight of water, 0.2 to 2 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant and 0.2 to 1 part by weight of a thickener And the acrylic resin used in the third solution is selected from the group consisting of vinyl chloride, vinyl acetate, acrylic acid, methacrylic acid, butyl acetate, methyl methacrylate, 2-hydroxyethyl acrylate, 2- One or more selected from the group consisting of methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, glycidyl acrylate, glycidyl acrylate and glycidyl methacrylate, Wherein the pigment to be mixed with the third liquid is selected from the group consisting of calcium carbonate, clay, talc, magnesium silicate, kaolin, Using the Jamaica, silica, aluminum silicate, aluminum hydroxide, barium sulfate, barium sulfate and at least one selected from a mixture thereof, and
The fourth solution is prepared by adding an acrylic polyol resin, a dispersing agent, a defoaming agent, a surfactant, a thickener and water into a mixing tank and then uniformly mixing them to prepare a mixture. After the pigment is added to the mixture, Wherein the acrylic polyol resin is used in an amount of 30 to 70 parts by weight, 0.2 to 0.5 parts by weight of a dispersant, 0.2 to 1 part by weight of a defoamer, 0.1 to 0.4 part by weight of a surfactant, 0.2 to 2 parts by weight of a thickener and 2 to 5 parts by weight of water And the mixture was uniformly mixed to prepare a mixed solution. 15 to 20 parts by weight of pigment were added based on 100 parts by weight of the total weight of the mixed solution, and the mixture was uniformly stirred at a speed of 500 to 1000 rpm using a stirrer Manufactured,
Wherein the fifth solution is a mixture of 5 to 10 parts by weight of a modified aliphatic polyamine as a curing agent resin and 1 to 5 parts by weight of 2,4,6-trimethylaminomethylphenol as a curing accelerator, Wherein the liquid is used in an amount of 10 to 50 parts by weight based on 100 parts by weight of the fourth liquid. delete

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