KR100906416B1 - Method of anti-corroding concrete and anti-corrosive coating layer - Google Patents

Abstract

A concrete corrosion protection method and a corrosion protection coating are provided to give acid-resistance and chemical-resistance to the surface of the concrete structure in which cracks are generated by using phenol novolac epoxy and polyurea paint. A concrete corrosion protection method is composed of the step(S110) of pre-processing the surface of the concrete structure, the step(S120) of forming an adhesive epoxy primer layer by coating the surface of the processed concrete structure with 2-liquid type phenol novolac epoxy paints, and the step(S130) of forming a polyurea coating layer with excellent acid-resistance by coating the epoxy primer layer with 2-liquid type polyurea paints made of isocyanate prepolymer as a main material.

Description

Method of Anti-Corroding Concrete And Anti-Corrosive Coating Layer

The present invention relates to a concrete anti-corrosive method and anti-corrosive coating using polyurea, and more particularly, to a method for forming a corrosion-resistant coating to give corrosion resistance and waterproofing to a concrete structure using a polyurea paint and a method formed accordingly It is to provide a coating film.

In general, concrete has good compressive strength, and has good elasticity, acid resistance, alkali resistance, chemical resistance, and UV resistance. However, as the use time elapses, a problem of deterioration in strength, leakage and buried reinforcement by materials containing impurities such as organic substances, acids, alkalis, inorganic salts, and the like further reduces durability of the structure. In addition, concrete structures have a certain degree of watertightness, but cracks are generated inside and outside the structure due to uneven cracks and irregularities in joints and cracks caused by external forces from the outside. Occurs, this leak further exacerbates the cracks and impairs the function of the concrete structure in the future.

Meanwhile, the development of various power generation industries, the steel / steel industry, and the electronics / battery industry has increased the use of various high-concentration acid aqueous solutions, which generates a large amount of high-concentration acid / wastewater. As a result, the waterproof construction of concrete structures in tanks and used spaces for storing and treating them is increasing day by day.

In general, an epoxy resin or an unsaturated polyester resin is used as the resin most commonly used to form a coating film for imparting acid resistance and water resistance to concrete structures. In particular, unsaturated polyester-based resins are widely used as FRP (Fiberglass Reinforced Plastics) resin as used with glass fibers. Such epoxy resins and FRP resins have excellent acid resistance and have been used in a waterproofing method for forming a coating film on the surface of concrete to protect and waterproof concrete of acid tanks and acid tanks.

However, the anticorrosive coating film formed by the anticorrosive method using the epoxy resin has a significantly lower elongation rate compared with the mechanical strength, and has only an elongation rate of bending, so that it can be applied in concrete where cracks are generated by continuous and repetitive shrinkage / expansion activity. Inappropriate That is, the anticorrosive coating film formed of the epoxy resin has a problem that the shrinkage / expansion activity of the concrete structure and the resistance to the cracks fall and cracks with the crack of the concrete structure.

In addition, the anticorrosive coating film formed by the waterproofing method using glass fiber and unsaturated polyester resin has excellent acid resistance and is widely used for storing and treating acidic aqueous solution and wastewater. Since it is formed by methods, such as up and spray up, it is difficult to maintain uniform thickness. In addition, it is not suitable for the structure that requires strength when the construction is under the appropriate thickness (6mm), and the glass fiber used as the reinforcing material is not burned and becomes a factor of environmental pollution when disposed, and when the worker is exposed to the glass fiber during construction. In addition to causing itching on the skin, the styrene monomer used as a diluent and a crosslinking agent when used in a confined space has a problem that the risk of suffocation and fire is always followed. In addition, the anticorrosive coating film formed by the above method has a problem of being easily bent or cracked due to too high strength, having no elongation at all, and not being easily tracked against concrete cracks such as epoxy resins, thereby easily peeling off from the concrete surface.

It is an object of the present invention to provide a concrete anticorrosive method for forming an anticorrosive coating film having excellent acid resistance and chemical resistance on the surface of a cracked concrete structure using phenol noble epoxy and polyurea.

 In addition, another object of the present invention is to provide an anticorrosive coating that provides chemical resistance and water resistance to acids to the concrete structure.

In order to perform the anticorrosive method of concrete according to an embodiment of the present invention for achieving the above object, the surface of the concrete structure is first pretreated. Subsequently, the two-component phenol noblock epoxy paint is coated on the surface of the pretreated concrete structure to form an epoxy primer film for bonding. Thereafter, a two-component polyurea coating based on an isocyanate prepolymer obtained by reacting an isocyanate compound with at least one polyol of silicon diol and hydroxy terminated polybutadiene (HTPB) is coated on the epoxy primer film. Thus, a polyurea film having excellent acid resistance is formed. As a result, an anticorrosive coating film having excellent corrosion resistance against acid and adhesion to the concrete structure may be formed.

In the concrete anticorrosive method, the two-component phenol noblock epoxy paint may be used as a phenol noble block epoxy resin for solvents, phenol noble block epoxy resin for solvents or water-soluble phenol noble block epoxy resin.

In the two-component polyurea paint, the two-component polyurea paint may be used as an isocyanate prepolymer having an NCO% of 14 to 16% and a viscosity of 500 to 700 cps / 25 ° C.

As an example, the two-component phenol noblock epoxy paint may be applied at 0.2 to 0.5 kg / m ² , and the polyurea coating may be formed to a thickness of 1 to 3 mm.

The anticorrosive coating film of concrete according to an embodiment of the present invention for achieving the above-mentioned other object is a bonding epoxy primer film formed by coating a two-component phenol noble epoxy paint on the surface of the concrete structure and silicon diol on the epoxy primer film And a polyurea film formed by coating a two-component polyurea paint based on an isocyanate prepolymer obtained by reacting at least one polyol of hydroxy terminated polybutadiene (HTPB) with an isocyanate compound. Can have

In the concrete anticorrosive coating, the epoxy primer film has a bonding force of 1100 to 2000psi with the concrete structure, and the polyurea film has an elongation of 350 to 450%.

Concrete anticorrosive method of the present invention can form an anticorrosive coating film having a chemical resistance by forming a two-component polyurea paint after forming the epoxy primer film for bonding on the pre-treated concrete structure. The anticorrosive method can form an anticorrosive coating film including an epoxy primer film having excellent adhesion and a polyurea film having excellent elongation and chemical resistance, thereby greatly improving chemical resistance, waterproofness and durability of a concrete structure having high cracking. . In addition, since the anticorrosive coating film uses a two-component paint having a curing time of several seconds, it is easy to work on the vertical surface and the working time is short, so that the air forming the anticorrosive coating film can be shortened.

Hereinafter, a preferred embodiment of the concrete anticorrosive method and anticorrosive coating film using phenol noble epoxy and polyurea will be described in detail. With respect to the embodiments of the present invention disclosed in the text, specific structural to functional descriptions are merely illustrated for the purpose of describing embodiments of the present invention, embodiments of the present invention may be implemented in various forms and It should not be construed as limited to the embodiments described in.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Anticorrosive coating of concrete

1 is a view showing an anticorrosive coating film formed on a concrete structure according to an embodiment of the present invention.

Referring to FIG. 1, the concrete anticorrosive coating film 130 having chemical resistance of the present embodiment includes an epoxy primer film 110 and a polyurea film 120 formed on the concrete structure 100.

Examples of the concrete structure include an inner wall of a building, a concrete floor, a concrete tank containing chemicals or water, and the like. The concrete structure is cracked after a certain time because the continuous and repeated shrinkage / expansion activity is made. In particular, in Korea, where four seasons are distinct, cracking of concrete occurs more and more. As an example, the concrete structure may have a surface pretreated. The pretreatment is a process of removing foreign substances present on the surface of the concrete structure and sealing cracks in the concrete structure.

The epoxy primer film 110 is provided between the concrete structure 100 and the polyurea film 120 and is a bonding film for improving adhesion between the polyurea film 120 and the concrete structure 100. The epoxy primer film is formed by coating and curing a two-component phenol noblock epoxy paint on the concrete structure 100. As an example, the epoxy primer film 110 may be formed by coating a two-component phenol noblock epoxy paint mixed with a solvent or water-soluble phenol noblock epoxy resin and a curing agent at 0.2 to 0.5 kg / m ² . As another example, the epoxy primer film may be formed by coating a two-component phenol noble block epoxy paint mixed with a solvent-free phenol noble block epoxy resin and a curing agent at 0.08 to 0.2 kg / m ² . In addition, the epoxy primer film 110 may have a bonding force of 1100 psi or more with respect to the concrete structure 100, and may have a bonding force of 1100 to 200 Psi.

The polyurea film 120 is formed on the epoxy primer film 110 on the concrete structure 100 and is a protective film having an elongation of 300% or more and having excellent chemical resistance, water resistance and abrasion resistance. The polyurea film is formed by coating and curing a two-component polyurea paint based on an isocyanate prepolymer on the epoxy primer film 110. As an example, the polyurea film may be formed by coating a two-component polyurea paint mixed with an isocyanate prepolymer having a NCO% of 10 to 22% and a viscosity of 200 to 1000 cps / 25 ° C. and a curing agent mixture to a thickness of about 1 to 3 mm. Can be. In addition, it can be formed by coating a polyurea paint with silicone or polybutadiene introduced into the main chain with high crosslinking density in order to impart acid / chemical resistance.

 Concrete anticorrosive coating film 130 of the above-described structure is easily due to expansion or cracking of the concrete structure due to the bonding properties of the epoxy primer film 110 and the elongation and chemical resistance of 350% or more of the polyurea film 120 Since peeling and breakage do not occur, the water resistance, corrosion resistance, chemical resistance and durability of the concrete structure can be greatly improved.

Concrete anticorrosion method

Figure 2 is a process flow diagram for explaining the concrete anti-corrosion method according to an embodiment of the present invention.

2, in order to perform the concrete anticorrosive method of the present embodiment, first, the surface of the concrete structure is pretreated (step S110).

The pretreatment of the concrete structure in step S110 includes a process of providing smoothness to the surface of the concrete structure, removing foreign substances present on the surface, repairing cracks of the concrete structure with polyurethane sealant, and the like. In other words, the removal of the leading part to secure the uniformity of the anticorrosive coating film, the removal of dust, oil, water, etc., which may weaken the adhesion between the concrete and the polyurea resin, and the weakness of the intersection of the crack part or the floor with the wall surface. If there is a part or a piping part, repairing and reinforcing with a polyurethane sealant, etc., and refers to the step of protecting the non-construction surface with a masking tape or the like. This pretreatment allows the concrete structure to have a high adhesion with the epoxy primer film formed thereafter.

Subsequently, the two-component phenol noblock epoxy paint is coated on the surface of the pretreated concrete structure to form an epoxy primer film for bonding (step S120).

In the step S120, the epoxy primer film may be formed by sequentially performing a process of preparing a two-component phenol noblock epoxy paint, a process of coating a two-component phenol noblock epoxy paint, and drying the same. The two-component phenol noblock epoxy paint has a composition in which a main resin and a hardener mixture including a phenol noblock epoxy resin are mixed.

As an example, the phenol noblock epoxy resin may include both a solvent-free phenol noblock epoxy resin, a solvent-type phenol noblock epoxy resin, and a water-soluble phenol noblock epoxy resin. In the case of the solvent-free phenol noblock epoxy resin, a phenol noblock epoxy, a bisphenol F epoxy resin, and other crosslinking agents and additives are prepared by mixing. It can be prepared by emulsifying using a non-reactive or reactive nonionic emulsion in a solvent-free form. HEP-8000R (solvent-free phenol noble epoxy primer), HEP-8045R (solvent-type phenol noble epoxy primer) and HEP-8045WR (water-soluble phenol noble epoxy primer) manufactured and sold by Hepsch Chem Can be.

In addition, the curing agent mixture is composed of a mixture of polyfunctional oligomers of which the terminal is made of an amine, and mainly uses an alicyclic amine, but in addition to the alicyclic amine, an aliphatic amine, aromatic amine, acid anhydride or imide. It is prepared by mixing with one selected from sol type. Examples of the cycloaliphatic amines include 4, 4-methylenebiscyclohexanamine, 1,2-diaminocyclohexane, and isophorone-diamine. Etc. can be mentioned. HEP-8000H (hardening agent of solvent-free phenol noble epoxy primer), HEP-8045H (hardening agent of solvent-type phenol noble epoxy primer) and HEP-8045WH (water-soluble phenolic noble epoxy primer) Curing agents) and the like.

In one embodiment, when the solvent-type or water-soluble phenol noble block epoxy resin is applied when the phenol noble block epoxy paint is coated with a coating amount of about 0.2 to 0.5kg / m ² . If the coating amount is less than 0.2kg / m ^{2 It} is not enough to apply to the concrete structure, the adhesion is inferior, if it exceeds 0.5kg / m ² , the cost is increased by more than necessary application. In another embodiment, when the solvent-free phenol noblock epoxy resin is applied when the phenol noblock epoxy paint is applied, the coating amount is about 0.08 to 0.2kg / m ² . If the coating amount is less than 0.08kg / m ² is not sufficient coating to the concrete structure, the adhesion is inferior, and if the coating amount exceeds 0.2kg / m ² , the cost is increased by more than necessary application. It is preferable that the noblock epoxy paint to which the solvent-free phenol noblock epoxy resin is applied is mainly used in a closed space. Epoxy primer film prepared using such a two-component phenol noble epoxy paint is excellent in acid and solvent resistance, and can prevent the damage of concrete that may be caused once the polyurea film formed thereafter is damaged. .

Subsequently, a two-component polyurea coating based on an isocyanate prepolymer is coated on the epoxy primer film to form a polyurea coating film having excellent acid resistance (step S130).

In the step S130, the polyurea coating film may be formed by sequentially performing a process of preparing a two-component polyurea paint, a process of spray coating a two-component polyurea paint and a process of drying them. The two-component polyurea paint has a composition in which a main resin and hardener mixture including an isocyanate prepolymer having an NCO content of 10 to 22% and a viscosity of 200 to 1000 cps / 25 ° C. is mixed. In addition, the main resin may have a high crosslinking density and silicone or polybutadiene in the main chain in order to impart excellent acid resistance / chemical resistance to the isocyanate prepolymer having a certain elongation and having excellent abrasion resistance.

Specifically, the two-component polyurea paint applied in this embodiment is a curing agent mixture prepared by mixing a main resin including an isocyanate prepolymer, an amine mixture, a silane coupling agent, a toner, and other additives. It has a composition comprising a.

The isocyanate prepolymers herein are obtained by reacting a diisocyanate or polyisocyanate having at least two -NCO groups with a polyol having at least two -OH groups, having an NCO% of 10 to 22% and a viscosity of 200 to 1000 cps / 25 ° C. Has characteristics. As the isocyanate prepolymer, HSC-D50RC P (ISO, main resin) manufactured and sold by Hepsch Chem can be used. As an example, diisocyanates and polyisocyanates that may be used in preparing the main resin include aromatic, cycloaliphatic, aliphatic diisocyanate, and polyisocyanate.

Examples of aliphatic diisocyanate include hexamethylenediisocyanate, 4,4-dicyclohexylmethane diisocyanate, 1,4-tetramethylene diisocyanate, 1,10-decamethylene diisocyanate, isophorone diisocyanate, 1,4-cyclohecane diisocyanate, and the like. These can be used individually or in mixture of 2 or more. Examples of the aromatic diisocyanate include toluene-2,4- or -2,6-diisocyanate, 1,5-naphthalene diisocyanate, 4-methoxy-1,3-phenylene diisocyanate, 4-chloro-1,3-phenylene diisocyanate, 2, 4-dimethyl-1,3-phenylene diisocyanate, 4,4'-diisocyanate diphenylether, benzidine diisocyanate, 4,4'-diisocyanate dibenxyl, methylene-bis (4-phenyl-isocyanate) -1,3-phenylene diisocyanate Can be. These can be used individually or in mixture of 2 or more.

In addition, as the polyol that can be used in the production of the main resin, at least one or more of silicon diol or Hydroxy terminated polybutadiene (HTPB) having two -OH groups at the terminal may be selected to impart acid / chemical resistance. The silicon diol may be a product name Silicon 2812 (US OSI Specialties Inc) having a molecular weight of 2,000 (equivalent weight 1,000), and the product name R45HT (Atochem Co., Ltd.) having a molecular weight of 2,000 (equivalent weight 1,000) as HTPB. Silicon diol has excellent chemical resistance and solvent resistance because the internal structure of the molecule is composed of silicon bonds. Therefore, polyurea synthesized using silicon diol has excellent acid / chemical resistance due to the silicon structure in the molecule. HTPB is also a compound having excellent acid resistance and solvent resistance, and has a rigid skeleton because its molecular structure is aliphatic hydrocarbons.

The amine-based mixture applied when preparing the curing agent mixture includes a silicone-modified amine having a functional group number of two or more. A detailed description of the silicone-modified amine is disclosed in detail in US Pat. Nos. 7,247,351 and US 7,348,392, and specific description thereof is omitted.

In addition, the amine-based mixture may include a polymer polyether amine having a amine group at the terminal, a reactive amine, an aromatic amine, and the like. Polymeric polyether amines such as D-2000, D-4000, T-3000, T-5000, etc. (Huntsman corporation) having a molecular weight of at least 2000, and the reactive amine, Diethylene toluenediamine (DETDA) (Albermarle, USA) and the trade name Unilink 4200 (UOP, USA) can be used as an aromatic amine. As the silane coupling agent, A1100 (OSI Specialities Inc.), which is a brand name aminosilane, may be used.

Meanwhile, the toner applied to the curing agent mixture may be used to impart color, and UV stabilizers, antifoaming agents, leveling agents, and the like may be used as other additives. Toner and other additives applied in the preparation of the curing agent mixture are not elements that limit the present invention, and thus detailed description thereof will be omitted.

In this embodiment, the polyurea coating film is formed by spray coating to have a thickness of 1 to 3mm. If the formation thickness is less than 1mm, sufficient chemical resistance and waterproofness cannot be imparted to the concrete surface, and if the thickness exceeds 3mm, the cost is increased by application more than necessary. The polyurea film formed by the above-described method has an elongation rate of about 350 to 450% and can impart high acid resistance, chemical resistance, and water resistance to a high concentration of acid to the concrete structure.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples of the concrete anticorrosive method. However, the scope of the present invention is not limited to the examples.

<Example 1>

First, apply a two-component phenol noblock epoxy paint (Hepschem HEP-8045R / H) corresponding to 0.25 Kg / m2 on a concrete specimen 50 mm long x 50 mm long and 30 mm thick, and then dried at room temperature for 24 hours. A film was formed. Subsequently, the two-component polyurea paint (HSC-D50RC P / R) was spray-coated to a thickness of 3 mm using Graco XP-2 on the epoxy primer film, and left at room temperature for 7 days to form an anticorrosive coating film. All specimens were fabricated more than six.

<Comparative Example 1>

First, one-component urethane paint (Hepschem Co., Ltd. VARO-BP (Primer)) is applied on the concrete specimen of 50mm X 50mm X 30mm thickness, corresponding to 0.25Kg / m2, and dried at room temperature for 24 hours to form a urethane primer film. Subsequently, the two-component polyurea paint (HSC-D50RC P / R) was spray-coated to a thickness of 3 mm using Graco XP-2 on the urethane primer film, and left at room temperature for 7 days to form an anticorrosive coating film. All specimens were fabricated more than six.

Comparative Example 2

Apply a two-component epoxy paint (HEP-602R / H from Hepce Chem, Inc.), not phenol noblock, onto a concrete specimen 50 mm x 50 mm X 30 mm thick, dried at room temperature for 24 hours. A urethane primer film was formed. Subsequently, the two-component polyurea paint (HSC-D50RC P / R) was spray-coated to a thickness of 3 mm using Graco XP-2 on the urethane primer film, and left at room temperature for 7 days to form an anticorrosive coating film. All specimens were prepared at least six. HEP-602R / H of Hepsechem Co., Ltd. was used.

Comparative Example 3

First, one-component urethane paint (Hepschem Co., Ltd. VARO-BP (Primer)) is applied on the concrete specimen of 50mm X 50mm X 30mm thickness, corresponding to 0.25Kg / m2, and dried at room temperature for 24 hours to form a urethane primer film. Subsequently, a general polyurea paint (Hepschem HSC-D50 P / R) was spray-coated to a thickness of 2 mm using Graco XP-2 on the urethane primer film, and the anticorrosive coating film was left at room temperature for 7 days. All specimens were fabricated at least six.

Physical properties and cured coating film of the two-component phenol noblock epoxy paint (HEP-8045R / H) applied to the above embodiment are summarized in Table 1, and the physical properties and cured coating film of the two-component polyurea paint (HSC-D50RC P / R). The characteristics of are summarized in Table 2.

TABLE 1

TABLE 2

As disclosed in Table 1, in the case of the epoxy primer film formed of the two-component phenol noblock epoxy paint, the adhesion with the concrete is excellent and in particular, the chemical resistance is very excellent. And as disclosed in Table 2 it can be seen that the polyurea film formed of a two-component polyurea paint has excellent flexibility and elongation rate of 350% or more, and excellent acid and solvent resistance.

Concrete anticorrosive coating evaluation

In order to perform acid resistance and refractory acid / fire resistance tests of the specimens in which the anticorrosive coating films of Examples 1 and Comparative Examples 1 to 3 were formed, three of the six specimens prepared in Examples 1 and Comparative Examples 1 to 3 were used, respectively. The adhesive strength before the chemical resistance test was evaluated, and the remaining three specimens were evaluated for the adhesive strength after the acid / chemical resistance test. The acid resistance / chemical resistance test is performed by immersing the specimen in each acid solution for 20 days, drying at room temperature for 24 hours, and then measuring the adhesion strength test by the method of ASTM 4551. The results are shown in Table 3 below.

TABLE 3

* Not measurable: Indicates that the coating has been broken or departed.

Looking at the test results disclosed in Table 3 it was confirmed that Example 1 has a very good adhesive strength even when exposed to all acidic solutions and organic solvents. That is, it was confirmed that the anticorrosive coating film containing the epoxy primer film of Example 1 was excellent in all acid resistance, chemical resistance, and bonding resistance. On the other hand, in the case of Comparative Examples 1 and 2, the urethane primer film and the general epoxy primer film were decomposed in all the acidic solutions, so that the polyurea film was separated, and thus measurement was impossible. In Comparative Example 3, the urethane primer film was decomposed to measure the bonding strength. That is, the anticorrosive coating films of Comparative Examples 1 to 3 were found to have very low resistance to all acids and solvents.

As described above, the concrete anticorrosive method of the present invention has a very low elongation rate due to the properties of the epoxy resin when forming the conventional anticorrosive coating film has no resistance to natural cracks of the concrete and styrene monomer and glass as a diluent used in the FRP resin process The use of fibers can solve the problems of human harmfulness and construction difficulties. In addition, the anticorrosive coating film formed by the concrete anticorrosive method of the present invention includes a polyurea film having an elongation rate of 350% or more, so that the damage due to expansion and cracking of the concrete can be prevented and at the same time for all acid solutions and organic solvents. Has excellent chemical resistance. In addition, since the concrete anticorrosive method uses a two-component paint that is cured in a short time, it is easy to work on the vertical surface and the working time is short, so that the air can be shortened, thereby reducing the overall construction cost. Moreover, it is possible to apply solvent-free paints, so it is possible to work in an enclosed space, and to impart human stability to the worker.

1 is a view showing an anticorrosive coating film formed on a concrete structure according to an embodiment of the present invention.

Figure 2 is a process flow diagram for explaining the concrete anti-corrosion method according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: concrete structure 110: epoxy primer membrane

120: polyurea film 130: anticorrosive coating film

Claims (7)

Pretreating the surface of the concrete structure; Forming a bonding epoxy primer film by coating a two-component phenol noblock epoxy paint on the surface of the pretreated concrete structure; And Coating a two-component polyurea paint based on an isocyanate prepolymer obtained by reacting an isocyanate compound with at least one polyol of silicon diol and hydroxy terminated polybutadiene (HTPB) on the epoxy primer film. Concrete waterproofing method comprising forming a polyurea film having excellent acid resistance. The concrete waterproofing method according to claim 1, wherein the two-component phenol noblock epoxy paint comprises a solvent-free phenol noblock epoxy resin, a solvent phenol noblock epoxy resin or a water-soluble phenol noblock epoxy resin. The method of claim 1, wherein the two-component polyurea paint comprises an isocyanate prepolymer having an NCO% of 10 to 22% and a viscosity of 200 to 1000 cps / 25 ° C. The method of claim 1, wherein the two-component phenol noblock epoxy paint is applied at 0.2 to 0.5 kg / m ² , and the polyurea film is formed at a thickness of 1 to 3 mm. The method of claim 1, wherein the epoxy primer film has a bonding force of 1100 to 2000psi with the concrete structure, the polyurea film has a concrete waterproof method, characterized in that having an elongation of 350 to 450%. The method of claim 1, wherein the pretreatment includes removing foreign substances present on the surface of the concrete structure and sealing cracks in the concrete structure. Epoxy primer membrane for bonding formed by coating a two-component phenol noblock epoxy paint on the surface of the concrete structure; And Coating a two-component polyurea paint based on an isocyanate prepolymer obtained by reacting an isocyanate compound with at least one polyol of silicon diol and hydroxy terminated polybutadiene (HTPB) on the epoxy primer film. Concrete anticorrosive coating film comprising a polyurea film formed.

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