KR101862010B1 - Coating construction method of surface of concrete structure and steel structure using eco-friendly paint composition with enhanced property of neutralization and salt damage resistance - Google Patents

Abstract

The present invention relates to a construction method for coating the surface of a steel structure and concrete using eco-friendly paint composition with improved properties of neutralization and salt damage resistance. Specifically, according to the present invention, the construction method for coating the surface of a steel structure and concrete using eco-friendly paint composition includes: (a) a step of arranging the surface of a structure to be coated by using a surface treating device after coating a degraded part of the structure with an alkaline recovery agent and coating an exposed reinforcing bar with a corrosion inhibitor and, also, after coating the surface of the reinforcing bar coated with the corrosion inhibitor with mortar for surface repair; (b) a step of coating the arranged surface of the structure with primer; (c) a step of applying a first paint onto the surface coated with the primer; (d) a step of applying a second aqueous epoxy paint onto the surface coated with the first paint; and (e) a step of applying a third aqueous epoxy paint onto the surface coated with the second paint. According to the present invention, the construction method can reinforce an adhesion force and a combining force with the surface to be coated. The paint composition used in the present invention has excellent durability.

Description

[0001] The present invention relates to a surface coating method of a concrete and a steel structure using an environmentally friendly coating composition having improved performance of neutralization and anti-

The present invention relates to a surface coating method for concrete and steel structures using an environmentally friendly coating composition having improved neutralization and anti-salt-preventing properties, and more particularly, to a surface coating method for a concrete structure or a steel structure having excellent adhesion and durability, The present invention relates to a method of coating a surface of a concrete and a steel structure using an environmentally friendly coating composition having characteristics capable of maintaining the effect for a long period of time and improving resistance to neutralization and salt corrosion.

Generally, civil engineering structures and building structures, especially concrete structures, are not only durable after penetration, but also have less durability over time and less service life. Especially, when built on the beach, it is often infiltrated with salt, and when it is built in factory wastewater area or sewage area, serious durability deteriorates due to penetration by various chemicals.

In order to reduce the durability of such civil engineering or building structures, it is common to coat the surface of the concrete structure with a coating agent (paint).

On the other hand, a conventional coating agent (coating material) has been mixed with an acrylic resin-based polymer and used as a filler. However, it has not been sufficient in terms of physical properties such as adhesion strength, durability and compressive strength to base material concrete.

On the other hand, Korean Patent Publication No. 2008-0094427 discloses a method for improving the adhesion with a conductor by using a blast furnace slag having high affinity to iron and cement as a filler, and by adding a soft resin, It has been proposed a technique capable of increasing the adhesion to the conductor by increasing the vibration proofness and lowering the curing rate by using an alkali metal hydroxide as a curing agent.

Korean Patent No. 10-0937632 discloses a fluorine-containing surfactant which is excellent in antistatic property and anti-dust adhesion property on the surface of a coating film in order to solve the problem that resistance of the existing coating composition to contamination is low, Chemical resistance, and mildew resistance.

However, the conventional coating agent (coating material) is advantageous in improving durability and chemical resistance. However, there is a need to improve the adhesion strength with the conductor, and the lack of properties such as waterproofness, anti- The surface protection effect of the steel structure was not sufficient.

The present invention has been developed in consideration of the circumstances of the prior art as described above. It is an object of the present invention to provide a steel sheet which has excellent protective function of the surface of concrete or steel, has excellent adhesion with the surface and excellent durability, There is provided a technique for producing a coating composition having an effect of maintaining the effect for a long period of time and improving resistance to neutralization and salting and a method of protecting and constructing the surface of a concrete or steel structure using the same, do.

In order to achieve the above object,

(a) applying an alkali recovery agent to a deteriorated portion of a structure, applying an antirust agent to the exposed reinforcing bars, applying a mortar to a surface of the exposed portion of the reinforcing bar, and then surface-finishing the surface of the structure to be coated with a surface treatment apparatus;

(b) applying a primer comprising cement, an admixture, liquid sodium silicate, liquid polysilane and water to the surface of the assembled structure;

(c) applying a primer coating comprising a primer, a resin, an alcohol solvent, and a corrosion inhibitor to the primer-coated surface;

(d) applying an aqueous epoxy based secondary paint comprising an epoxy base, an amine base curing agent and water on the surface to which the primary paint is applied; And

(e) coating an aqueous urethane-based tertiary paint comprising a water-dispersible acrylic urethane resin, an extender pigment and silane on the surface to which the secondary paint is applied, and A surface coating method of a steel structure is provided.

In one embodiment of the present invention, in the step (b), the primer comprises 10 to 30 parts by weight of cement, 5 to 20 parts by weight of an admixture, 15 to 45 parts by weight of liquid sodium silicate, 5 to 20 parts by weight of liquid polysilane, And 55 to 80 parts by weight.

The liquid polysilane may be prepared by mixing at least one silane monomer selected from the group consisting of dichloromethylphenylsilane, dichlorodimethylsilane, dichlorodiphenylsilane, dichlorohexylmethylsilane and dichlorovinylmethylsilane in an organic solvent, The polymer formed is filtered to separate the silicon polymer and then dissolved in an organic solvent.

In one embodiment of the present invention, in the step (c), the primary paint comprises 20 to 50 parts by weight of an alumina powder, 10 to 30 parts by weight of an epoxy resin, 30 to 60 parts by weight of an alcohol solvent, And a weight portion.

In an embodiment of the present invention, in the step (d), the secondary paint is an aqueous epoxy paint comprising an epoxy base, an amine base curing agent and water, wherein the epoxy base comprises 20 to 40 parts by weight of a liquid epoxy resin 0.2 to 2.0 parts by weight of a thickening agent, 5 to 20 parts by weight of an extender pigment, 0.2 to 2.0 parts by weight of a wetting agent, 0.2 to 2.0 parts by weight of a dispersing agent, 0.2 to 2.0 parts by weight of a defoaming agent, Wherein the amine curing agent comprises 30 to 60 parts by weight of an amine compound, 20 to 40 parts by weight of water, 0.2 to 2.0 parts by weight of a defoaming agent, and 0.2 to 3.0 parts by weight of a thickener, And a curing agent is mixed at a weight ratio of 10: 3 to 10, and 100 to 500 parts by weight of water is added to 100 parts by weight of the mixture of the epoxy base and the amine curing agent to obtain a coating material .

(E), the tertiary coating material may contain 50 to 80 parts by weight of an aqueous urethane resin, 0.2 to 2.0 parts by weight of a dispersant, 0.5 to 2.0 parts by weight of a thickener, 0.2 to 2.0 parts by weight of a defoaming agent, 0.2 to 2.0 parts by weight of a silane, and 0.2 to 5.0 parts by weight of a preservative.

The characteristics and advantages of the surface coating method of the concrete and steel structure using the environmentally friendly coating composition with improved neutralization and anti-saltiness performance according to the present invention will be described below.

1. First of all, it is possible to strengthen adhesion and bonding force with the coated surface by treating the base with a material containing a cement and an admixture excellent in affinity with the concrete and the steel surface, and containing a material capable of filling the pores of the coated surface finely .

2. Also, the coating composition used in the present invention is excellent in durability and particularly excellent in properties such as chemical resistance, water resistance, anti-neutralization, and anti-salt resistance, and thus has excellent surface protection effect of concrete and steel structure.

3. According to the present invention, since organic solvents and heavy metals are not eluted, they are environmentally friendly, and the lifetime of the coating film can be prolonged, so that the protective effect of the surfaces of concrete and steel can be maintained for a long period of time.

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

The present invention relates to a paint which protects the surface protection effect for a long period of time by using a paint for protecting the surface of a concrete structure or a steel structure by being excellent in performance such as environment-friendliness, bondability with a conductor, water resistance, durability, chemical resistance, The present invention relates to a construction method, and more particularly,

(a) applying an alkali recovery agent to a deteriorated portion of a structure, applying an antirust agent to the exposed reinforcing bars, applying a mortar to a surface of the exposed portion of the reinforcing bar, and then surface-finishing the surface of the structure to be coated with a surface treatment apparatus;

(b) applying a primer comprising cement, an admixture, liquid sodium silicate, liquid polysilane and water to the surface of the assembled structure;

(c) applying a primer coating comprising a primer, a resin, an alcohol solvent, and a corrosion inhibitor to the primer-coated surface;

(d) applying an aqueous epoxy based secondary paint comprising an epoxy base, an amine base curing agent and water on the surface to which the primary paint is applied; And

(e) applying an aqueous urethane-based tertiary paint comprising a water-dispersible acrylic urethane resin, an extender pigment and silane to the surface to which the secondary paint is applied.

Hereinafter, each of the above steps will be described in detail.

1. Repair mortar application and surface treatment step

First, the deteriorated portion of the damaged structure is chipped and the surface or cross-section is trimmed until the undamaged portion comes out. That is, it is possible to remove cracks, dropouts, rebar rust, lifting and corrosion of the reinforced concrete structure caused by the aging phenomenon such as alkali aggregate reaction, sea damage, salt corrosion or neutralization (carbonation) . At this time, an electric hammer or a hand tool can be used, and a high-pressure water cleaner can be used.

Subsequently, an alkaline recovery agent is applied to the surface of the structure and an antirusting agent is applied to the exposed reinforcing bars. The alkaline recovery agent may be, for example, a silicate-based alkaline recovery agent, and more specifically, a lithium silicate-based alkaline recovery agent may be used, but is not limited thereto. The antirust agent may be ginseng base antirust agent, but is not limited thereto.

Subsequently, the surface to which the alkali remover is applied and the rust-preventive coating agent is applied is applied by spraying the surface repair mortar composition or by hand-painting.

The mortar composition for repairing an end face used in the present invention comprises 20 to 40 parts by weight of cement, 2 to 10 parts by weight of a calcium sulfoaluminate (CSA) based swelling agent, 5 to 25 parts by weight of a fine powder filler, 1 to 10 parts by weight of a re- 0.1 to 0.5 parts by weight of a water reducing agent, 0.1 to 0.5 parts by weight of reinforcing fibers, 40 to 60 parts by weight of silica, 1 to 20 parts by weight of a silica light weight having a specific gravity of 0.2 to 0.4 g / cm ³ having an average diameter of 0.1 to 3 mm, 0.1 to 10 parts by weight of an inorganic curing agent may be used. Specific examples of the mortar disclosed in the Korean Registered Patent No. 10-1798593 filed by the present applicant may be used as it is or in applications.

Subsequently, contaminants such as adhering paint, rust, dust, and oil on the surface formed on the structure are treated using a surface treatment apparatus.

The surface treatment apparatus can be equipped with a high-pressure washer and a dust collecting apparatus. The surface treatment apparatus can remove the rust generated by oxidation of the paint surface, oxidation of the surface, foreign substances on the surface, and oil powder, have.

2. Primer application step

The primer is applied to the surface having been subjected to the surface treatment.

The primer used in this step improves the water resistance and durability of the surface of the structure, and is used for enhancing the bonding force between the coating paint formed later and the surface of the to-be-chain structure.

The primer used in the present invention is composed of components including cement, admixture, liquid sodium silicate, liquid polysilane and water.

Specifically, the primer used in the present invention includes 10 to 30 parts by weight of cement, 5 to 20 parts by weight of an admixture, 15 to 45 parts by weight of liquid sodium silicate, 5 to 20 parts by weight of liquid polysilane and 55 to 80 parts by weight of water .

The cement and the admixture permeate the damaged area of the structure due to the external environment, thereby protecting the structure from harmful substances and increasing the durability.

In the present invention, the admixture is preferably a blend of slag fine powder and fly ash at a ratio of about 10: 1 to 5.

The liquid sodium silicate is obtained by dissolving water-soluble sodium silicate, and the mixing ratio can be mixed and dissolved at a weight ratio of water: sodium silicate of about 100: 20-100.

The liquid polysilane is obtained by mixing a silane monomer with an organic solvent and then polymerizing. More specifically, at least one silane monomer selected from the group consisting of dichloromethylphenylsilane, dichlorodimethylsilane, dichlorodiphenylsilane, dichlorohexylmethylsilane and dichlorovinylmethylsilane is mixed with an organic solvent, and the metal catalyst is dispersed and polymerized to form A polymer obtained by separating a silicone polymer by filtration and then dissolving it in an organic solvent may be used.

The primer obtained by the above composition can tightly fill and expand the pores on the surface of the structure, thereby enhancing the adhesive bonding force with the paint to be applied thereafter and improving the water resistance and durability.

3. Primary coating application step

The primary coating is applied to the surface to which the primer is applied. The primary coating used in this step is one which comprises a zinc oxide, a resin, an alcohol solvent and a corrosion inhibitor.

More specifically, it may be composed of 20 to 50 parts by weight of an aldehyde resin, 10 to 30 parts by weight of an epoxy resin, 30 to 60 parts by weight of an alcohol solvent, and 5 to 10 parts by weight of a corrosion inhibitor.

The end-of-year is a by-product of sedimentation when refining zinc by distillation, and the end-of-year end is used to improve the rust-preventive properties of the structure coating.

As the epoxy resin, it is preferable to use a bisphenol A epoxy resin having an epoxy equivalent of 150 to 200 g / eq using a bisphenol A epoxy resin. Specific examples thereof include bisphenol F diglycidyl ether, Chemicals such as YDF-161, YDF-170 and YDF-175 can be used.

The alcohol solvent may be methanol, ethanol, isopropanol, or the like

As the corrosion inhibitor, barium phosporosilicate, calcium borosilicate and the like, which are eco-friendly materials that do not contain heavy metals, can be used.

4. Second paint application step

Subsequently, after the primary paint is hardened and cured, a secondary paint is applied to the surface to which the primary paint is applied.

In the present invention, the secondary paint is an aqueous epoxy secondary paint comprising an epoxy base, an amine base curing agent and water.

Specifically, the aqueous epoxy-based secondary coating comprises an epoxy base, an amine-based curing agent, and water. The epoxy base includes 20 to 40 parts by weight of a liquid epoxy resin, 0.2 to 2.0 parts by weight of a vanadium acid metal salt, And the wetting agent is contained in an amount of 10 to 30 parts by weight, 0.5 to 2.0 parts by weight of a dispersant, 0.2 to 1.0 part by weight of a defoaming agent, 0.2 to 2.0 parts by weight of a thickener, 5 to 20 parts by weight of an extender pigment, Wherein the mixing ratio of the epoxy-based amine-based curing agent is in the range of 10: 3 to 10: 10, and the mixing ratio of the amine-based curing agent is 10: 3 to 10: And 100 to 500 parts by weight of water is added to 100 parts by weight of a mixture of the obtained epoxy main agent and amine curing agent.

First, 20 to 40 parts by weight of a liquid epoxy resin, 0.2 to 2.0 parts by weight of a vanadium metal salt, 10 to 30 parts by weight of water, 0.5 to 2.0 parts by weight of a dispersant, 0.2 to 1.0 part by weight of a defoamer, 2.0 to 2.0 parts by weight of an extender pigment, and 0.2 to 2.0 parts by weight of a wetting agent.

The liquid epoxy resin may be a bisphenol A liquid epoxy resin, and the bisphenol A liquid epoxy resin may improve adhesiveness and bonding strength.

The vanadium metal salt serves to improve the corrosion resistance of the paint and is water-soluble. Specific examples thereof include calcium vanadium oxide, potassium vanadium and the like.

The dispersing agent is used to ensure color uniformity by dispersing the extender pigment in a liquid phase during the mixing of the subject matter. As such a dispersing agent, a nonionic type or an anionic type can be selected and used.

The antifoaming agent is used for suppressing bubbles of the base material to form a uniform coating film, and a nonionic or silicone antifoaming agent may be used.

The thickener is used for preventing settling of the extender pigment and improving workability, and specifically, a bentonite-based, urethane-based or acrylic-based thickener can be used.

The extender pigment improves the strength of the coating film and improves the adhesion of the coating film to the coating film due to irregularities on the coating film surface, thereby improving moisture resistance and water resistance. The extender pigment used in the present invention may be selected from calcium carbonate, barium sulfate, clay, talc, mica, and silica.

In the present invention, the wetting agent plays a role of imparting hydrophilicity to the material, so that the water-soluble epoxy resin having a water-soluble epoxy resin can smoothly form a coating film. Specifically, a hydroxyethylcellulose wetting agent can be used.

The amine-based curing agent serves to accelerate the curing of the epoxy resin-based component.

Specific examples of the amine curing agent include 30 to 60 parts by weight of an amine compound, 20 to 40 parts by weight of water, 0.2 to 2.0 parts by weight of a defoaming agent, and 0.2 to 3.0 parts by weight of a thickener.

The amine compound may be selected from aliphatic, aromatic, and alicyclic amine compounds, and has an amine equivalent of 100 to 320 g / eq and a room temperature viscosity of 30 to 40,000 cps.

Other components such as the antifoaming agent and thickener may be the same as or different from those used in the epoxy main component.

In order to form the secondary paint in the present invention, the mixing ratio of the epoxy base: amine base curing agent is 10: 3 to 10, and 100 parts by weight of the mixture of the epoxy base and amine base curing agent is mixed with 100 parts by weight of water To 500 parts by weight of the coating composition.

5. Third paint application step

Subsequently, after the secondary paint is cured and cured, a tertiary paint is applied to the surface to which the secondary paint is applied.

The application of the tertiary paint is a step of applying an aqueous urethane-based tertiary paint comprising a water-dispersible acrylic urethane resin, an extender pigment and silane.

Specifically, the water-based urethane-based third paint comprises 50 to 80 parts by weight of an aqueous urethane acrylate resin, 0.2 to 2.0 parts by weight of a dispersant, 0.5 to 2.0 parts by weight of a thickener, 5 to 20 parts by weight of an extender pigment, 0.2 to 2.0 parts by weight of a defoamer, 0.2 to 2.0 parts by weight and 0.2 to 5.0 parts by weight of a preservative.

The water-dispersed acrylic urethane resin may be selected from the group consisting of 2-hydroxyethyl methacrylate (2-HEMA), methyl methacrylate (MMA), n-butyl acrylate a polyurethane acrylate hybrid emulsion synthesized by adding an acrylate monomer selected from acrylate and acrylic acid (AAc) and an anionic or nonionic emulsifier and an initiator may be used. The water-dispersed acrylic urethane resin is environmentally friendly because it is rapidly dried and exhibits excellent weatherability, durability and ultraviolet stability even under external exposure conditions and is water-soluble.

The dispersant is used for uniformly dispersing a color pigment in a liquid phase during the mixing of a water-soluble urethane-based paint to form a uniformly colored film. In the present invention, a nonionic type polyoxyalkylene type surfactant or an anionic type polycarboxylic acid salt And a surfactant may be used.

The thickener is used for preventing the settling of the pigment and for improving the workability at the time of coating, and in the present invention, any one selected from bentonite, urethane, and acrylic can be used.

The extender pigment is for color development of a water-soluble urethane-based paint, and any one selected from among red iron oxide, titanium dioxide, yellow iron oxide and carbon black may be used.

The antifoaming agent is for suppressing bubbles in the water-soluble urethane coating to form a uniform coating film. In the present invention, any one selected from a nonionic system and a silicone system can be used.

The silane is used for improving the adhesive strength and improving the water resistance and durability of the coating film. Examples of the silane include glycidoxypropyl methyldiethoxy silane, gamma-methacryloxy propyl triethoxy silane ), Gamma-Glycidoxypropyl trimethoxy silane, gamma-Amino propyl triethoxy silane, and Vinyltrimethoxy silane may be used. .

The above-mentioned cosolvent is used in order to increase the solubility of the solvent and to facilitate the film form, and is used in the form of a mixture of 2, 2, 4-trimethyl-1,3-pentanediolmonoisobutyrate, N-butylacetate, ) Can be used.

By using the above-described environmentally friendly coating composition, the surface coating of the structure to be applied by the above method is excellent in the bonding force and durability with the surface of the concrete and the steel structure of the road, and particularly, The surface protection effect of the concrete and the steel structure is excellent. In addition, since organic solvents and heavy metals are not soluble as water-soluble, they are environmentally friendly, and the life of the coating can be prolonged, so that the protective effect of the surface of the structure can be maintained for a long period of time.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the following examples.

[Example]

Example 1

(1) Mortar application and surface treatment: Silicate-based alkali remover is applied to the deteriorated part of the structure, ginseng salt-based rust inhibitor is applied to the exposed reinforcing bar, and then mortar for repairing the surface is applied to the rust- The surface of the structure was subjected to surface treatment using a vacuum cleaner to remove surface rattles and foreign matter on the bottom surface using a surface treatment device (shot blaster). The same mortar as that described in Production Example 1 of Korean Patent Registration No. 10-1798593, which is a registered patent of the present applicant, was used as the section mortar.

(2) Application of primer: 10 parts by weight of an admixture composed of 15 parts by weight of portland cement, a mixture of slag powder and fly ash, 30 parts by weight of liquid sodium silicate, 10 parts by weight of liquid polysilane, And 60 parts by weight of water were mixed to form a thin layer of the primer.

(3) Coating of the primary coating: A primary coating formed by mixing 25 parts by weight of an epoxy resin, 20 parts by weight of an epoxy resin, 45 parts by weight of an alcohol solvent and 10 parts by weight of a corrosion inhibitor on the surface of the primer cured, Respectively.

(4) Secondary paint application: 30 parts by weight of bisphenol A type epoxy resin, 1.0 part by weight of calcium vanadium, 1.0 part by weight of dispersant, 0.5 part by weight of defoamer, 0.5 part by weight of thickener, 10 parts by weight of an extender pigment and 0.8 part by weight of a wetting agent were mixed to obtain a main component. 40 parts by weight of an amine compound, 30 parts by weight of water, 0.8 parts by weight of a defoaming agent and 1.5 parts by weight of a thickener were mixed to obtain a curing agent component. Mixing ratio of 10: 5, and about 300 parts by weight of water was added to 100 parts by weight of the obtained mixture of the curing agent and the curing agent to obtain a coating material (secondary coating material). The obtained secondary coating material was applied to the surface to which the primary coating material had been applied at a predetermined thickness.

(5) Application of tertiary paint: 60 parts by weight of water-dispersed acrylic urethane resin, 1.0 part by weight of dispersant, 0.9 parts by weight of thickener, 0.9 parts by weight of anti-foaming agent, 1.5 parts by weight of silane, (Tertiary paint). The obtained third coating material was applied to the surface to which the secondary coating material had been applied at a predetermined thickness.

The total thickness of the coating film was coated to maintain about 250 탆.

Comparative Example 1

The procedure was carried out in the same manner as in Example 1 except that the primer was applied without applying the primer described in (2).

Comparative Example 2

Except that the coating was carried out in the same manner as in Example 1, but without applying the primary anticorrosive paint of (3).

Comparative Example 3

Except that the coating was carried out in the same manner as in Example 1, but without applying the secondary anticorrosive paint of (4).

Comparative Example 4

Except that the coating was carried out in the same manner as in Example 1, but without the application of the tertiary anticorrosive paint of (5).

Performance evaluation

1. Evaluation of rust resistance, adhesion strength, acid resistance, flexural resistance and water resistance

The rust resistance, adhesion strength, acid resistance, flexural resistance and water resistance of the coating film formed according to Example 1 and Comparative Examples 1 to 4 were evaluated, and the results are shown in Table 1.

Sample Anti-rust properties (ASTM D610) Bond Strength (KSM6715-01)
(kgf / cm2) Acid resistance
(KSMSI02812-1-02) Flexibility
(KS M 5000-03, Φ10mm, 180 ° bending) Water resistance
(KSMSI02812-2-02) Example 1 0.1% or less 37 clear clear clear Comparative Example 1 0.2% or less 31 clear clear clear Comparative Example 2 0.3% or less 32 clear clear clear Comparative Example 3 0.2% or less 32 clear clear clear Comparative Example 4 0.3% or less 33 clear clear clear

 From the results of Table 1, it can be confirmed that when the coating of the structure using the coating composition prepared in the present invention is applied, the adhesive strength is excellent and other properties are also excellent.

2. Evaluation of flame retardancy, weatherability, chloride ion penetration resistance, impact resistance

The flame retardancy, weather resistance, chloride penetration resistance and impact resistance of the coating films formed according to Example 1 and Comparative Examples 1 to 4 were evaluated. (Flame retardancy was evaluated by UL94 method and other properties were evaluated by the method of KS F 4929 (2010)),

As a result of evaluation, flame retardancy showed self-extinguishing property in all samples and other properties were found to be suitable or no abnormal in all samples.

From the above experimental results, it can be confirmed that when the coating composition for protecting concrete and steel surface according to the present invention is used, excellent paint properties such as excellent mechanical properties and chemical properties are obtained.

Claims (6)

(a) applying an alkali recovery agent to a deteriorated portion of a structure, applying an antirust agent to the exposed reinforcing bars, applying a mortar to a surface of the exposed portion of the reinforcing bar, and then surface-finishing the surface of the structure to be coated with a surface treatment apparatus;
(b) applying a primer comprising cement, an admixture, liquid sodium silicate, liquid polysilane and water to the surface of the assembled structure;
(c) applying a primer coating comprising a primer, a resin, an alcohol solvent, and a corrosion inhibitor to the primer-coated surface;
(d) applying an aqueous epoxy based secondary paint comprising an epoxy base, an amine base curing agent and water on the surface to which the primary paint is applied; And
(e) coating an aqueous urethane-based tertiary paint comprising a water-dispersible acrylic urethane resin, an extender pigment and silane on the surface to which the secondary paint is applied, and Surface Coating Method of Steel Structures.
The primer according to claim 1, wherein the primer comprises 10-30 parts by weight of cement, 5-20 parts by weight of an admixture, 15-45 parts by weight of liquid sodium silicate, 5-20 parts by weight of liquid polysilane and 55-80 parts by weight of water And a surface coating method of the concrete and steel structure using the environmentally friendly coating composition.
The method according to claim 1, wherein the liquid polysilane in (b) is at least one silane monomer selected from the group consisting of dichloromethylphenylsilane, dichlorodimethylsilane, dichlorodiphenylsilane, dichlorohexylmethylsilane and dichlorovinylmethylsilane in an organic solvent Wherein a polymer obtained by dispersing and polymerizing a post metal catalyst is filtered to separate a silicon polymer and then dissolved in an organic solvent. The method of coating a surface of a concrete and a steel structure using an environmentally friendly coating composition.
The method of claim 1, wherein the primary paint comprises 20 to 50 parts by weight of an alumina powder, 10 to 30 parts by weight of an epoxy resin, 30 to 60 parts by weight of an alcohol solvent, and 5 to 10 parts by weight of a corrosion inhibitor The present invention relates to a method for coating a surface of concrete and steel structures using an environmentally friendly coating composition.
2. The aqueous epoxy resin composition according to claim 1, wherein the secondary paint comprises an epoxy base, an amine base curing agent and water, wherein the epoxy base comprises 20 to 40 parts by weight of a liquid epoxy resin, 0.2 to 2.0 parts by weight of an antifoaming agent, 0.2 to 2.0 parts by weight of a thickening agent, 5 to 20 parts by weight of an extender pigment, and 0.2 to 2.0 parts by weight of a wetting agent. Wherein the amine curing agent comprises 30 to 60 parts by weight of an amine compound, 20 to 40 parts by weight of water, 0.2 to 2.0 parts by weight of a defoaming agent, and 0.2 to 3.0 parts by weight of a thickener, Is used in a weight ratio of 10: 3 to 10, and 100 to 500 parts by weight of water is added to 100 parts by weight of a mixture of the obtained epoxy base and amine curing agent to obtain an eco-friendly coating composition. Surface coating method of a concrete and steel structure.
(E), the third paint comprises 50 to 80 parts by weight of a water-dispersed acrylic urethane resin, 0.2 to 2.0 parts by weight of a dispersant, 0.5 to 2.0 parts by weight of a thickener, 5 to 20 parts by weight of an extender pigment, 0.2 To 2.0 parts by weight of silane, from 0.2 to 2.0 parts by weight of silane, and from 0.2 to 5.0 parts by weight of a stabilizer. Description: TECHNICAL FIELD The present invention relates to a surface coating method for concrete and steel structures using an environmentally friendly coating composition.