KR20170092486A - Hardening paint for moisture surface and method of treating surface of structure applying hardening paint for moisture surface - Google Patents

Abstract

The present invention relates to a curable paint composition for wet surface and a method of treating the surface of a structure using the curable paint composition. The curable paint composition is prepared by mixing 20 to 30 parts by weight of a curing agent including an amine-based material with 100 parts by weight of a main agent including bisphenol-A type epoxy, butadiene-acrylonitrile rubber, calcium carbonate, diluent, and filler. The present invention provides a paint composition which not only is cured even on the wet surface with a high moisture content to form a coating film, but also has excellent water resistance, chemical resistance, corrosion resistance, flexibility, and elongation. Further, the present invention provides a method of treating the structure by a simpler method using the paint composition having excellent water resistance, chemical resistance, corrosion resistance, flexibility, and elongation.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a curable coating composition for wet surfaces and a method for treating a surface of a structure using the same,

To a curable coating composition usable on a wet surface and to a method of treating the surface of a structure using the same.

The surface of the structure exposed to the outside such as the floor and wall of the building, the concrete water tank for water and sewage, and the ship is corroded by air and moisture, and the durability of the structure is lowered. Thus, the coating is formed on the surface of the structure, Protect. Thus, the paint applied to the surface of the structure improves the physical and chemical properties of the structure, while improving the aesthetics of the structure with its unique gloss and color. Generally, epoxy resin which is easy to handle and excellent in corrosion resistance, chemical resistance, durability and adhesion property is mainly used, but epoxy resin should be used together with organic solvent which discharges harmful volatile components, and cured epoxy resin There is a problem that cracks are easily generated due to impact or vibration due to high brittleness.

In Korean Patent No. 10-1027595, a coating film is formed on the surface of a structure using a waterproofing composition containing a primer including an epoxy resin, an organic solvent and a hardener, a plastic resin, an epoxy resin and a curing agent to prevent cracking of the coating film However, there is a problem that cracks are generated in the coating film or the coating film is separated from the structure because it can not cope with contraction and expansion of the structure due to humidity or temperature change.

In addition, in the prior art including the above-mentioned registered patent, since a primer is used together with a paint to treat the surface of a structure exposed to the outside, a primer manufacturing process, a primer coating process, a primer hardening process, There is a problem in that it takes a long time to process the surface of the structure because the surface of the structure is treated by a complicated process including a process and a paint curing process. In addition, since conventional epoxy-based coatings and primers can be applied only under the conditions of a water content of less than 8% and a relative humidity of 85% or less, when the water content and the relative humidity are high, the primer and the paint applied on the surface of the structure are not sufficiently cured There was a problem that was difficult to construct.

The present invention also provides an eco-friendly coating composition which is improved in flexibility and elongation so that it is easy to construct a structure by forming a coating film on a wet surface and can respond to shrinkage and expansion of the structure. In addition, it is possible to omit the step of applying the primer to the surface of the structure, thereby providing a method of treating the surface of the structure in a short time with a simpler process. The present invention is not limited to the above-described technical problems, and another technical problem can be derived from the following description.

According to one aspect of the present invention, there is provided a curable coating composition for wetting surfaces, comprising: a base comprising a bisphenol-A type epoxy, butadiene-acrylonitrile rubber, calcium carbonate, a diluent, and a filler; And an amine-based material. The curing agent is mixed with the curing agent in a ratio of 20 to 30 parts by weight based on 100 parts by weight of the composition, and the composition is applied to the surface of the structure.

The subject matter is based on a mixture of 35 to 50% by weight of bisphenol A epoxy, 5 to 15% by weight of butadiene-acrylonitrile rubber, 35 to 45% by weight of calcium carbonate, 0.1 to 2.5% by weight of diluent and 3.1 to 5.3% , And a ratio of the bisphenol A epoxy of 35 to 50 wt%, butadiene-acrylonitrile rubber of 5 to 15 wt%, calcium carbonate of 35 to 45 wt%, diluent of 0.1 to 2.5 wt%, and filler of 3.1 to 5.3 wt% The curing agent may be mixed in a proportion of 20 to 30 parts by weight based on 100 parts by weight of the mixture.

The amine-based material may include Meta Xylene Diamine. The filler may be a mixture comprising at least one of clay, carbon black, titanium oxide, and silica.

The method for treating the surface of a structure using the coating composition according to another aspect of the present invention includes mixing the curing agent of the first aspect at a ratio of 20 to 30 parts by weight per 100 parts by weight of the subject matter of claim 1 to form a coating composition (20); An application step (30) of applying the coating composition to the surface of the structure at least once; And a coating film forming step (40) of forming a coating film on the surface of the structure by curing the coating composition applied to the surface of the structure.

In the mixing step, a ratio of bisphenol A epoxy of 35 to 50 wt%, butadiene-acrylonitrile rubber of 5 to 15 wt%, calcium carbonate of 35 to 45 wt%, diluent of 0.1 to 2.5 wt%, and filler of 3.1 to 5.3 wt% Wherein the surface of the structure is treated with a curing coating composition for a wet surface in which the curing agent is mixed in an amount of 20 to 30 parts by weight with respect to 100 parts by weight of the mixture.

The coating composition is repeatedly applied to the surface of the structure one or more times at intervals of 8 to 12 hours in the coating composition application step and the coating composition applied on the surface of the structure is cured for at least 24 hours have.

A curing agent comprising a base and an amine-based material, wherein the curing agent comprises a bisphenol A epoxy, a butadiene-acrylonitrile rubber, calcium carbonate, a diluent, and a filler, wherein the curing agent is used in a proportion of 20 to 30 parts by weight It is possible to produce a coating composition which not only forms a coating film by curing on the wet surface even when it is applied to the surface of the structure, but also has more flexibility and elongation than conventional coatings. Particularly, since the flexibility and elongation of the coating composition according to the present invention are remarkably improved, even if the structure shrinks or expands due to external stimuli, the coating film formed on the surface of the structure does not easily crack.

In addition, a mixture of 35 to 50 wt% of bisphenol A type epoxy, 5 to 15 wt% of butadiene-acrylonitrile rubber, 35 to 45 wt% of calcium carbonate, 0.1 to 2.5 wt% of diluent, and 3.1 to 5.3 wt% of filler The strength, chemical resistance, impact resistance, flexibility, and elongation can be further improved by mixing the curing agent at a ratio of 20 to 30 parts by weight with respect to 100 parts by weight of the subject.

Further, the use of the amine-based material as the curing agent improves the adhesion of the coating composition by the reaction between the bisphenol A type epoxy resin and the curing agent. In particular, when meta-xylene diamine is used as the amine-based material, the coating composition is cured on the wet surface to form a coating film on the surface of the wetted structure, and the heat resistance and chemical resistance are further improved.

 Further, by using a mixture containing at least one of clay, carbon black, titanium oxide and silica as a filler, the physical and chemical properties of the coating composition can be improved at a relatively low cost. In addition, the use of a filler improves the gloss and color of the coating film, thereby improving the aesthetics of the structure.

In addition, a mixture of 35 to 50 wt% of bisphenol A type epoxy, 5 to 15 wt% of butadiene-acrylonitrile rubber, 35 to 45 wt% of calcium carbonate, 0.1 to 2.5 wt% of diluent, and 3.1 to 5.3 wt% of filler A coating composition is formed by mixing 20 to 30 parts by weight of a curing agent with respect to 100 parts by weight of a base material, and the coating composition is cured and cured on the surface of the structure to provide excellent strength, chemical resistance, impact resistance, heat resistance, flexibility , And an elongation ratio can be formed. Accordingly, the structure is protected from external stimuli, and even if the structure contracts or expands, the coating film formed on the surface of the structure is not easily cracked. In addition, the use of the primer can be omitted, and the surface of the structure can be treated in a short time by a simpler method.

In addition, since the coating composition applied on the surface of the structure is semi-cured after 8 to 12 hours, if the coating composition is repeatedly applied to the structure several times over 8 to 12 hours on the surface, A coating film having a thickness can be formed. Further, by curing the applied coating composition for 24 hours or more, a coating film having a uniform thickness and having a smooth surface can be formed. Thus, the aesthetics of the structure can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart illustrating a method of treating a wetted surface using a wetting surface coating composition according to one embodiment of the present invention.

An embodiment of the present invention relates to a curable coating composition for a wet surface which is applied to the surface of a structure to protect a structure exposed to the outside, and a method for treating the surface of the structure using the composition. The coating composition of this embodiment is cured on the surface of a structure having a high water content to form a coating on the surface of the structure, thereby protecting the structure from external stimuli, and being excellent in flexibility and elongation so that even if the structure shrinks or expands, Is not generated.

The coating composition of the present embodiment is a two-component type coating material which is separated from a base material and a curing agent. The base material and the curing agent can be mixed and used at the construction site. The main theme of the coating composition is an epoxy resin as a main component and a mixture in which various materials are further mixed to improve performance. The coating composition of the present example is a coating composition comprising a base material and an amine-based material including bisphenol-A type epoxy, butadiene-acrylonitrile rubber, calcium carbonate, a diluent, And the curing agent is mixed in a ratio of 20 to 30 parts by weight with respect to 100 parts by weight of the subject and applied to the surface of the structure.

As described above, the subject matter includes bisphenol-A type epoxy, butadiene-acrylonitrile rubber, calcium carbonate, diluent, and filler, and each component of the subject is bisphenol A type epoxy 35 to 50 wt% of epoxy, 5 to 15 wt% of butadiene-acrylonitrile rubber, 35 to 45 wt% of calcium carbonate, 0.1 to 2.5 wt% of diluent, and 3.1 to 5.3 wt% of filler. A detailed description of the properties and uses of the aforementioned components will be provided later.

The bisphenol A type epoxy resin is a main component of the coating composition of this embodiment, and improves the heat resistance, chemical resistance and adhesion of the coating composition. The bisphenol A type epoxy resin has a low volume shrinkage rate during the curing process, Environment-friendly construction is possible because there is little generation of harmful volatile components. Also, the bisphenol A type epoxy resin is excellent in water resistance, so that even if there is moisture on the surface of the structure, the bisphenol A type epoxy resin can be cured by pushing the water outward, so that it can be applied on the wet surface. Particularly, since the bisphenol A type epoxy resin reacts with the amine-based material to have higher adhesiveness, the coating film using the coating composition of this embodiment is strongly adhered to the surface of the structure and is not easily separated from the structure.

More specifically, the bisphenol A type epoxy has a structure having two epoxy groups at both ends. The epoxy group of the bisphenol A type epoxy is ring-opened by the active hydrogen of the amine group (-NH ₂ ) of the amine-based material to form a chain type Compound. In this process, a large amount of hydroxyl groups (R-OH) is generated due to the reaction between the epoxy group of the bisphenol A type epoxy resin and the amine group of the amine type substance. The hydroxyl group is located between the interface of the coating composition and the structure, Thereby further improving the adhesion.

That is, the coating composition is more strongly adhered to the surface of the structure in the course of curing by the reaction of the curing agent containing the bisphenol A type epoxy resin and the curing agent containing the amine-based material, so that the coating film using the coating composition of this embodiment is easily separated . Thus, unlike the prior art in which a coating film is exfoliated or separated from the surface of the structure by moisture, when the wetting surface is treated using the coating composition of this embodiment, the coating film is not lifted or separated, The maintenance cost can be reduced.

The coating composition may be used in an amount of 35 to 50 wt% based on the total weight of the bisphenol A epoxy resin. When the bisphenol A epoxy resin is less than 35 wt%, the coating composition may have poor chemical resistance, heat resistance, water resistance, The performance of the coating film may be deteriorated because the coating composition is not cured on the wet surface. When the bisphenol A type epoxy resin is more than 50% by weight, the economical efficiency is lowered and the viscosity of the coating composition becomes too high, The basicity of the coating composition becomes stronger due to the lowered and excessively generated hydroxyl groups, so that the structure can be corroded.

The butadiene-acrylonitrile rubber is a low molecular weight liquid rubber polymer and plays a role in improving the toughness, adhesion, flexibility and elongation of the bisphenol A type epoxy resin. As the butadiene-acrylonitrile rubber of this embodiment, a carboxy-terminated butadiene-acrylonitrile copolymer (CTBN) may be used. As described above, the bisphenol A type epoxy resin has excellent heat resistance, water resistance, chemical resistance, adhesiveness and wet curing property. However, when cured, the brittleness increases and cracks are easily generated by external stimuli. . The above external stimulus may be a change in humidity or temperature, a strong impact and a vibration.

In order to solve such a problem, the present embodiment improves the flexibility and elongation of the coating composition by mixing and curing the butadiene-acrylonitrile rubber having high flexibility and elongation together with the bisphenol A type epoxy resin. Accordingly, the flexibility and elongation of the coating composition are improved, so that when a stimulus is applied to the structure from the outside, the coating easily cracks or the coating film can not be separated from the structure. The butadiene-acrylonitrile rubber exists in a liquid state at room temperature and is easily mixed with the epoxy resin.

The coating composition can be used in an amount of 5 to 15% by weight of butadiene-acrylonitrile rubber based on the total weight. When the butadiene-acrylonitrile rubber is less than 5% by weight, the flexibility and elongation of the coating composition are low, If the content of the butadiene-acrylonitrile rubber exceeds 15% by weight, the coating film becomes excessively soft, and the hardness, weatherability, and adhesiveness are lowered and the viscosity is increased, so that the workability may be lowered.

Calcium carbonate improves the mechanical strength by filling the pores formed in the coating film during the curing process of the coating composition, and improves the absorbency and the rust prevention property. The coating composition of the present embodiment can be applied not only to a general cement structure, but also to structures of various materials such as a metal material structure and a new material structure. In particular, since the steel material structure is corroded and rusted by the action of air, water, carbon dioxide, etc., the calcium carbonates excellent in water absorbency and rustproofing property are used in this embodiment.

More specifically, calcium carbonate is mixed with the coating composition and filling the pores formed in the coating film in the process of curing by the curing agent containing an amine-based material, thereby improving the mechanical strength of the coating film to protect the structure from external stimuli . Also, the calcium carbonate prevents the rusting of the metal by preventing moisture, air, and carbon dioxide from flowing from the outside through the pores by filling the pores of the coating film. Particularly, since calcium carbonate is excellent in water absorbability, when the coating composition of the present embodiment is applied to the wetted surface, the coating composition can be hardened by absorbing moisture to improve the adhesion of the coating film and the structure, Can be prevented.

The coating composition may be used in an amount of 35 to 45% by weight based on the total weight of the coating composition. When the amount of the calcium carbonate is less than 35% by weight, the coating composition may have poor rust resistance and water absorbability and hard to cure on the wet surface, If the content exceeds 45% by weight, the coating film may become excessively hardened by calcium carbonate, and the flexibility and elongation of the coating film may be deteriorated. On the other hand, calcium carbonate is an extender pigment and plays a role of controlling the gloss of the coating film when curing the coating composition, so that the aesthetics of the structure can be improved with the luster and color peculiar to calcium carbonate.

The diluent serves to adjust the viscosity of the coating composition and to improve adhesion and workability. A mixture of a bisphenol A type epoxy resin and a butadiene-acrylonitrile rubber has a high viscosity, so that there is a problem that workability is very low when a coating composition is applied or sprayed. Accordingly, in the present embodiment, the viscosity and the workability are improved by mixing a diluent into the coating composition to lower the viscosity. The diluent also helps to homogeneously mix the butadiene-acrylonitrile rubber, calcium carbonate, and the filler described below with the bisphenol A type epoxy resin.

The diluent may be divided into a reactive diluent which participates in the reaction and a non-reactive diluent which is merely physically mixed with the epoxy resin, having at least one epoxy group. In this embodiment, the non-reactive diluent which is physically mixed with each component is used to uniformly mix the components, while the viscosity of the coating composition is lowered to improve the adhesion and workability. The non-reactive diluent used in this embodiment is benzyl alcohol, salicylic acid, ethyl acetate, ethanol, and the like, and is not particularly limited thereto.

The coating composition may be used in an amount of 0.1 to 2.5% by weight based on the total weight of the composition. When the amount of the diluent is less than 0.1% by weight, the viscosity of the coating composition is too high to coat or spray the coating composition. If the amount of the diluent is more than 2.5% by weight, the viscosity of the coating composition may be excessively diluted, so that the curing time may become longer and the strength of the coating film may be lowered.

In addition to the above-mentioned bisphenol A type epoxy resin, butadiene-acrylonitrile rubber, calcium carbonate and a diluent, a filler is added to the coating composition of this embodiment to improve various properties of the coating composition. The filler is mainly added for the purpose of reducing the manufacturing cost, adjusting the viscosity of the coating material, preventing cracking, improving the mechanical strength, etc. In this embodiment, a filler is used to improve the physical and chemical properties of the coating composition. As the filler, a mixture containing at least one of clay, carbon black, titanium oxide, and silica may be used.

The clay is excellent in absorbency such as calcium carbonate and absorbs moisture to enable the coating composition of the present embodiment to be cured on the wet surface and to prevent the coating film from being separated from the structure by moisture. Carbon black is a black fine carbon powder, which improves the water resistance, oil resistance, heat resistance and mechanical strength of a paint composition. As described above, the carbon black plays a role of a black pigment in addition to improving the performance of the coating composition, and the amount thereof can be adjusted depending on the application place of the coating composition.

Titanium oxide produces active oxygen with strong oxidizing power in oxygen or water by ultraviolet rays. Since this active oxygen acts as an antibacterial agent for removing various pollutants, the coating film exposed to light can be antibacterial by ultraviolet rays. Also, titanium oxide is used as an extender and affects the color of the coating film. The silica is mixed with the coating composition like the above-mentioned calcium carbonate, and improves the mechanical strength of the coating film by filling the pores formed in the coating film in the process of curing by the curing agent containing the amine-based material and controls the gloss of the coating film do.

The coating composition may be used in an amount of 3.1 to 5.3% by weight based on the total weight of the coating composition. If the amount of the filler is less than 3.1% by weight, the water resistance, water absorption, mechanical strength, , The economical efficiency is lowered and the curing reaction of the main component bisphenol A type epoxy resin and butadiene-acrylonitrile rubber may be hindered by excessive filler. On the other hand, the filler may be used by mixing at least one of the clay, carbon black, titanium oxide and silica described above, and the mixing ratio of each component is not particularly limited.

The subject of the coating composition is a mixture of bisphenol A type epoxy, butadiene-acrylonitrile rubber, calcium carbonate, diluent and filler in an amount of 35 to 50% by weight of bisphenol A type epoxy, 5 to 15% by weight of butadiene-acrylonitrile rubber, By weight of calcium carbonate, 35 to 45% by weight of calcium carbonate, 0.1 to 2.5% by weight of diluent and 3.1 to 5.3% by weight of a filler. Thus, water resistance, heat resistance, chemical resistance, corrosion resistance, , And a coating composition excellent in elongation can be produced.

The coating composition of this embodiment includes a curing agent for curing the subject other than the above-mentioned subject. Conventionally, an amide-based material is mainly used as a curing agent, but the curing speed is slow and the water resistance is low. Accordingly, in this embodiment, the use of the amine-based material as the curing agent improves the curing rate and improves the adhesion and the water resistance. Further, as described above, in this embodiment, by using a curing agent containing an amine-based material, a large amount of hydroxyl group (R-OH) is generated by reaction of an epoxy group of bisphenol A type epoxy resin with an amine group of amine- And the adhesion of the structure is further improved.

In general, the curing agent accelerates the reaction similar to the catalyst, but participates in the direct reaction. Therefore, even if the same subject is used, the characteristics of the coating composition vary depending on the kind of the curing agent. Accordingly, in this embodiment, the heat resistance and chemical resistance of the coating composition are improved by using Meta Xylene Diamine, which is excellent in heat resistance and chemical resistance among the amine-based materials and is highly resistant to moisture and applicable to the wetting side, as a curing agent So that the coating composition can be cured even in a structure having a high water content. Meanwhile, in the curing agent of the present embodiment, a diluent, a filler, etc. may be further mixed in addition to the amine-based material.

According to the present embodiment, it is possible to provide a composition comprising 35 to 50% by weight of bisphenol A type epoxy, 5 to 15% by weight of butadiene-acrylonitrile rubber, 35 to 45% by weight of calcium carbonate, 0.1 to 2.5% by weight of diluent, The curing agent containing an amine-based material may be mixed in a ratio of 20 to 30 parts by weight based on 100 parts by weight of the mixture. Particularly, a coating composition prepared using meta xylene diamine as a curing agent has improved heat resistance, chemical resistance, water resistance, flexibility, and elongation as compared with conventional paints, so that even when a stimulus is applied to a coating film, . In addition, it can be applied to a structure having a high water content or a structure continuously exposed to moisture as the coating film is formed by curing on the surface of a moisture-containing structure.

1 is a flow chart illustrating a method of treating a surface of a structure using a wetting surface coating composition according to an embodiment of the present invention. Referring to FIG. 1, a method of treating a surface of a structure according to the present embodiment includes a pretreatment step 10, a mixing step 20, an application step 30, and a film formation step 40.

In the pretreatment step 10, the foreign matter on the surface of the structure to which the coating composition is applied is removed and planarized. The pretreatment step 10 may be carried out before the coating composition mixing step 20 to form a coating having a smooth surface, which further enhances the adhesion between the coating composition applied to the surface of the structure and the surface of the structure, . The method for removing and planarizing the foreign matter on the surface of the structure in the pretreatment step (10) is not particularly limited and may be selectively performed under the judgment of the operator depending on the situation of the workplace.

For example, it is possible to scratch or remove foreign matter on the surface of a structure by using a separate tool or equipment such as a broom, a cleaner, or a washing machine. By applying or spraying a foreign material removing agent, dust, latency, residual cement, Can be dissolved and removed. In case of concrete structure, damaged area can be restored by applying mortar, cement, elastic sealant, etc. to the damaged area such as grooves and cracks, and the neutralized part can be removed by high pressure water spraying. In this embodiment, the pretreatment step (10) smoothes the surface of the structure so that the adhesion between the coating composition applied to the surface of the structure and the surface of the structure is further improved and a coating film having a smooth surface can be formed.

In the mixing step (20), a curing agent containing an amine-based material is added in a proportion of 20 to 30 parts by weight to 100 parts by weight of a subject including a bisphenol A type epoxy resin, a butadiene-acrylonitrile rubber, calcium carbonate, a diluent and a filler To form a coating composition. As described above, the coating composition according to the present embodiment is a two-component type coating material which is separated from a base material and a curing agent. When the base material and the curing agent are mixed, the base material is mixed with the curing agent before coating the coating composition on the surface of the structure, To prepare a coating composition.

In the mixing step 20 according to the present embodiment, 35 to 50 wt% of bisphenol A type epoxy, 5 to 15 wt% of butadiene-acrylonitrile rubber, 35 to 45 wt% of calcium carbonate, 0.1 to 2.5 wt% of diluent, 100 to 100 parts by weight of the mixture mixed at a ratio of 3.1 to 5.3% by weight are mixed at a ratio of 20 to 30 parts by weight of a curing agent containing an amine-based material. Particularly, as the coating composition is produced at the composition ratio as described above, the coating composition of the present embodiment can have excellent water resistance, chemical resistance, corrosion resistance, flexibility, and elongation.

First, bisphenol A type epoxy, butadiene-acrylonitrile rubber, calcium carbonate, diluent, and filler are added to the reactor in an amount of 35 to 50 wt% of bisphenol A type epoxy, 5 to 15% by weight of butadiene-acrylonitrile rubber, 35 to 45% by weight of calcium carbonate, 0.1 to 2.5% by weight of a diluent and 3.1 to 5.3% by weight of a filler. The subject can then be prepared by mixing the ingredients injected into the reactor using a stirrer. The preparation of the subject may be carried out at room temperature or may be carried out at a temperature of 50 to 60 DEG C for uniform mixing of the components. The production temperature of the subject matter is not particularly limited, but it is preferable to follow the temperature conditions described above.

Then, the reactor was charged with 35 to 50% by weight of bisphenol A type epoxy, 5 to 15% by weight of butadiene-acrylonitrile rubber, 35 to 45% by weight of calcium carbonate, 0.1 to 2.5% by weight of diluent and 3.1 to 5.3% , And 20 to 30 parts by weight of a curing agent containing an amine-based material are added to 100 parts by weight of the main component. The subject and the curing agent introduced into the reactor are mixed using a stirrer, and stirring is performed for 10 to 20 minutes so that the two materials can be uniformly mixed. The subject and the curing agent introduced into the reactor can be mixed by an agitator mounted in the reactor, mixed using a separate mixing and stirring apparatus, or mixed by another method without using an agitator.

On the other hand, a small amount of diluent may be added for uniform mixing of the subject and the curing agent, and the diluent may be selected from the non-reactive diluent as described above. Further use of the diluent may be carried out under the judgment of the operator and may be used in small amounts within a range that does not affect the physical properties of the coating composition. On the other hand, as the mixture of the subject and the curing agent is mixed and heated, the mixing of the curing agent and the subject introduced into the reactor can be performed at room temperature, and an additional cooling process may be performed.

The coating composition can be used by mixing 20 to 30 parts by weight of the curing agent with respect to 100 parts by weight of the subject. When the amount of the curing agent is less than 20 parts by weight based on 100 parts by weight of the subject, the curing time of the coating composition becomes excessively long, It is difficult to form a coating film on the surface of the structure. If the amount of the curing agent is more than 30 parts by weight based on 100 parts by weight of the subject, the economical efficiency is lowered, and each component constituting the curing agent and the curing agent by the excessively- As the coating is hardened and solidified due to the unreacted coating, the coating film properties may be deteriorated and cracks may easily occur in the coating film or may be easily separated from the structure. Particularly, since the mixing ratio of the main component and the curing agent influences the overall characteristics of the coating composition of the present embodiment, attention should be paid to the composition ratio described above.

Thus, the coating composition formed in the mixing step 20 can be prepared in liquid form with slight viscosity as the viscosity is lowered by the diluent. Accordingly, the surface of the structure can be coated with a coating device or a tool such as a ruler, an applicator or the like on the surface of the structure in the coating step 30, and sprayed through the sprayer.

On the other hand, as described above, due to the reaction of the bisphenol A type epoxy resin and meta xylene diamine of the present embodiment, hydroxyl groups are generated, the coating film formed through the curing reaction of the curing agent and the curing agent is strongly adhered to the surface of the structure, Is unnecessary. Therefore, in this embodiment, since the adhesion of the coating composition to the structure and the primer coating and curing step for improving the bonding strength are not performed, the coating composition is directly applied on the surface of the pretreated structure. As described above, in this embodiment, by omitting the use of the primer, the structure can be processed in a short time by a simpler method, and the surface of the structure can be processed at low cost.

In the application step 30 the coating composition is applied at least once to the surface of the structure. According to this embodiment, the coating composition can be applied to the surface of the structure by using an applicator such as a ruler or an applicator, and sprayed on the surface of the structure by using a spraying tool such as an atomizer or a tube to be applied to the surface of the pretreated structure . The coating composition applied on the surface of the pretreated structure by the above-mentioned method can be cured on the wet surface to form a coating film, so that the coating film can be formed even when the moisture content of the surface of the structure is high.

Conventionally, in order to treat the surface of a structure, an undercoating paint is applied to the surface of a structure to be cured, and then an intermediate paint is applied and cured on a cured undercoat paint. Finally, Was coated and cured to form a coating film. The above-described mid-use paint and topcoat may be the same material. In other words, conventionally, different types of paints are used in the lower, middle, and upper sides to form a coating on the surface of the structure, which increases the construction cost and increases the construction time. On the other hand, as described above, in this embodiment, the coating film of the desired thickness can be formed by repeatedly applying one coating composition according to the present embodiment to the surface of the structure without using separate undercoat paint, intermediate paint and topcoat paint. So that the construction cost is lower and the construction time is shorter than in the prior art.

In the coating step 30, the coating composition can be repeatedly applied in order to increase the thickness of the coating film or to further improve the strength of the coating film. The number of repetitive application of the coating composition is not particularly limited, but it should not exceed 10 times. If the coating composition is repeatedly applied 10 times or more, it takes a long time to cure and cure the coating composition, which may take a long time to treat the surface of the structure.

On the other hand, when the coating composition is repeatedly applied on the surface of the structure in the coating step 30, the coating composition is applied to the surface of the structure and is repeatedly applied at least once at intervals of 8 to 12 hours. Thus, by repeatedly applying the coating composition to the surface of the structure surface, it is possible to adjust the required thickness of the coating depending on the construction site. In particular, the coating composition applied to the surface of the structure in the application step 30 is applied and after 8 to 12 hours it changes from a liquid state with a slight viscosity to a semi-solidified semi-solid state. Thus, if a coating composition in a liquid state having a slight viscosity is further applied to the coating composition in a semi-solid state, a boundary layer between the coating compositions repeatedly applied is not formed and the coating composition is uniformly adhered to each other, Can be formed.

If the coating composition is further applied at an interval of 8 hours or less after coating, the degree of curing of the coating composition already applied is very low, so that the coating composition is still present in a liquid state having a slight viscosity, It is possible to form a coating film which is non-uniformly mixed with the coating composition and has a non-uniform thickness and whose surface is not smooth. When the coating composition is further applied at an interval of 12 hours or more after the application of the coating composition, the applied coating composition becomes a solid state rather than a semi-cured semi-solid state, so that the coating composition can not be mixed well with the applied coating composition to form a layer . Accordingly, there is a problem that a layer is formed on a coating film and a coating layer and a layer are separated from each other due to an external stimulus. In this embodiment, it is possible to effectively protect the structure receiving the strong external stimulus in this way.

In the coating film forming step (40), a coating composition coated on the surface of the structure is cured to form a coating film on the surface of the structure. In the coating composition application step 30 described above, the coating composition applied at least once on the surface of the structure is cured for a predetermined time to cure the coating composition to form a coating film on the surface of the structure. The thickness of the coating film can be adjusted according to the number of application times of the coating composition as described above.

A coating film is formed by curing the coating composition applied on the surface of the structure in the coating film forming step (40) for more than 24 hours. If the coating composition is cured for less than 24 hours in the coating film forming step (40), the coating composition can not be sufficiently cured and a coating film having excellent properties as described above can not be formed, and the coating film having a uniform thickness and smooth surface The curing time of the coating composition should be considered. Thereafter, a coating agent, a waterproofing agent, a coloring agent, and the like may be further applied to the surface of the formed coating film, and this may be performed under the judgment of the operator depending on the environment or appearance of the workplace.

Hereinafter, the coating composition of the present invention will be specifically described by way of examples, comparative examples and test examples. These embodiments are only for illustrating the present invention, and thus the scope of the present invention is not construed as being limited by these embodiments.

≪ Example 1 >

According to the embodiment of the present invention described above, a curable coating composition for a wet surface is prepared as follows, and the surface of the structure is treated using the composition. The contents of the embodiments described above are followed even if omitted. First, 50 parts by weight of bisphenol A epoxy, 9 parts by weight of butadiene-acrylonitrile rubber, 35 parts by weight of calcium carbonate, 1.5 parts by weight of a diluent and 4.5 parts by weight of a filler were added to a first reactor maintained at a temperature of 50 to 60 캜 And the mixture was stirred for 10 minutes. Subsequently, 100 parts by weight of a subject prepared by the above-described method was added to a second reactor at room temperature, 25 parts by weight of metaxylene diamine was added to 100 parts by weight of the subject, and the mixture was stirred for 10 minutes to mix the coating composition. At this time, stirring was performed at a speed of 300 to 500 rpm in the mixing of the subject and the coating composition.

Thereafter, a mixed solution obtained by mixing the foreign material removing agent and water at a ratio of 1: 1 was applied to the surface of the structure to dissolve and remove the foreign matter. Water was sprayed on the surface of the structure from which the foreign matter was removed by using an injector to make it wet on the surface of the structure. Then, the coating composition was applied once using a roller, and the coating composition was cured for about 26 hours to form a coating film on the surface of the structure.

≪ Example 2 >

According to the embodiment of the present invention described above, a curable coating composition for a wet surface is prepared as follows, and the surface of the structure is treated using the composition. The contents of the embodiments described above are followed even if omitted. First, 50 parts by weight of bisphenol A epoxy, 9 parts by weight of butadiene-acrylonitrile rubber, 35 parts by weight of calcium carbonate, 1.5 parts by weight of a diluent and 4.5 parts by weight of a filler were added to a first reactor maintained at a temperature of 50 to 60 캜 And the mixture was stirred for 10 minutes. Subsequently, 100 parts by weight of a subject prepared by the above-described method was added to a second reactor at room temperature, 25 parts by weight of metaxylene diamine was added to 100 parts by weight of the subject, and the mixture was stirred for 10 minutes to mix the coating composition. At this time, stirring was performed at a speed of 300 to 500 rpm in the mixing of the subject and the coating composition.

Thereafter, a mixed solution obtained by mixing the foreign material removing agent and water at a ratio of 1: 1 was applied to the surface of the structure to dissolve and remove the foreign matter. Water was sprayed on the surface of the structure from which the foreign matter was removed by using an injector to make it wet on the surface of the structure. Then, the coating composition was repeatedly applied three times at intervals of 10 hours using a roller, and finally, the coating composition was applied and cured for about 26 hours to form a coating film on the surface of the structure.

≪ Comparative Example 1 &

According to the embodiment of the present invention described above, a curable coating composition for a wet surface is prepared as follows, and the surface of the structure is treated using the composition. The contents of the embodiments described above are followed even if omitted. First, 50 parts by weight of bisphenol A epoxy, 9 parts by weight of butadiene-acrylonitrile rubber, 35 parts by weight of calcium carbonate, 1.5 parts by weight of a diluent and 4.5 parts by weight of a filler were added to a first reactor maintained at a temperature of 50 to 60 캜 And the mixture was stirred for 10 minutes. Subsequently, 100 parts by weight of a subject prepared by the above-mentioned method was added to a second reactor at room temperature, 25 parts by weight of HHPA (Hexa hydrophthalic anhydride) was added to 100 parts by weight of the subject, and the mixture was stirred for 10 minutes to mix the coating composition . At this time, stirring was performed at a speed of 300 to 500 rpm in the mixing of the subject and the coating composition.

Thereafter, a mixed solution obtained by mixing the foreign material removing agent and water at a ratio of 1: 1 was applied to the surface of the structure to dissolve and remove the foreign matter. Water was sprayed on the surface of the structure from which the foreign matter was removed by using an injector to make it wet on the surface of the structure. Then, the coating composition was applied once using a roller, and the coating composition was cured for about 26 hours to form a coating film on the surface of the structure.

≪ Comparative Example 2 &

According to the embodiment of the present invention described above, a curable coating composition for a wet surface is prepared as follows, and the surface of the structure is treated using the composition. The contents of the embodiments described above are followed even if omitted. First, 50 parts by weight of bisphenol A epoxy, 9 parts by weight of butadiene-acrylonitrile rubber, 35 parts by weight of calcium carbonate, 1.5 parts by weight of a diluent and 4.5 parts by weight of a filler were added to a first reactor maintained at a temperature of 50 to 60 캜 And the mixture was stirred for 10 minutes. Subsequently, 100 parts by weight of a subject prepared by the above-described method was added to a second reactor at room temperature, 25 parts by weight of metaxylene diamine was added to 100 parts by weight of the subject, and the mixture was stirred for 10 minutes to mix the coating composition. At this time, stirring was performed at a speed of 300 to 500 rpm in the mixing of the subject and the coating composition.

Thereafter, a mixed solution obtained by mixing the foreign material removing agent and water at a ratio of 1: 1 was applied to the surface of the structure to dissolve and remove the foreign matter. Water was sprayed on the surface of the structure from which the foreign matter was removed by using an injector to make it wet on the surface of the structure. Then, the coating composition was repeatedly applied three times at intervals of about 20 hours using a roller, and finally, the coating composition was applied and cured for about 26 hours to form a coating film on the surface of the structure.

≪ Comparative Example 3 &

According to the embodiment of the present invention described above, a curable coating composition for a wet surface is prepared as follows, and the surface of the structure is treated using the composition. The contents of the embodiments described above are followed even if omitted. First, 50 parts by weight of bisphenol A type epoxy, 44 parts by weight of calcium carbonate, 1.5 parts by weight of diluent and 4.5 parts by weight of filler were added to a first reactor maintained at a temperature of 50 to 60 DEG C, Respectively. Subsequently, 100 parts by weight of a subject prepared by the above-mentioned method was added to a second reactor at room temperature, 25 parts by weight of ethylene diamine was added to 100 parts by weight of the subject, and the mixture was stirred for 10 minutes to mix the coating composition. At this time, stirring was performed at a speed of 300 to 500 rpm in the mixing of the subject and the coating composition.

Thereafter, a mixed solution obtained by mixing the foreign material removing agent and water at a ratio of 1: 1 was applied to the surface of the structure to dissolve and remove the foreign matter. Water was sprayed on the surface of the structure from which the foreign matter was removed by using an injector to make it wet on the surface of the structure. Then, the coating composition was applied once using a roller, and the coating composition was cured for about 26 hours to form a coating film on the surface of the structure.

≪ Comparative Example 4 &

According to the embodiment of the present invention described above, a curable coating composition for a wet surface is prepared as follows, and the surface of the structure is treated using the composition. The contents of the embodiments described above are followed even if omitted. First, 50% by weight of bisphenol A epoxy, 10% by weight of butadiene-acrylonitrile rubber, 38% by weight of calcium carbonate and 2.0% by weight of diluent were added to a first reactor maintained at a temperature of 50 to 60 ° C, The subject was prepared by stirring. Subsequently, 100 parts by weight of a subject prepared by the above-mentioned method was added to a second reactor at room temperature, 25 parts by weight of ethylene diamine was added to 100 parts by weight of the subject, and the mixture was stirred for 10 minutes to mix the coating composition. At this time, stirring was performed at a speed of 300 to 500 rpm in the mixing of the subject and the coating composition.

Thereafter, a mixed solution obtained by mixing the foreign material removing agent and water at a ratio of 1: 1 was applied to the surface of the structure to dissolve and remove the foreign matter. Water was sprayed on the surface of the structure from which the foreign matter was removed by using an injector to make it wet on the surface of the structure. Then, the coating composition was applied once using a roller, and the coating composition was cured for about 26 hours to form a coating film on the surface of the structure.

≪ Test Example 1 >

In Test Example 1, tests were conducted to compare the degree of curing of the coating composition on the wet side by making water contents of the structures to be treated according to Examples 1 and 2 and Comparative Example 1 different from each other. In Test Example 1, Examples 1, 2, and Comparative Example 1 were carried out in the same manner as described above. The water content of the surface of the structure was adjusted to 4%, 7%, and 10% 10%, respectively, and the relative humidity of the coating composition was 85%.

The state of the coating composition Example 1 Example 2 Comparative Example 1 Water content 4% The coating composition is cured to form a coating on the surface of the structure The coating composition is cured to form a coating on the surface of the structure The coating composition is cured to form a coating on the surface of the structure Moisture content 7% The coating composition is cured to form a coating on the surface of the structure The coating composition is cured to form a coating on the surface of the structure The paint composition failed to cure sufficiently and only partially cured Water content 10% The coating composition is cured to form a coating on the surface of the structure The coating composition is cured to form a coating on the surface of the structure The coating composition is not cured sufficiently

As shown in Table 1, in Examples 1 and 2 in which meta-xylylenediamine was mixed as a curing agent to be mixed with the subject, all of the coating compositions were cured at a water content of 4 to 10% to form a coating film on the surface of the structure. On the other hand, in Comparative Example 1 using HHPA which is not a meta-xylene diamine as a hardener mixed with the subject, the coating composition cures to form a coating film at a moisture content of 4%, but at a water content of 7% or more, the coating composition can not cure, Is not formed. Thus, it can be seen that when an amine-based material is used as a curing agent for a coating composition, the coating composition cures even in a structure having a high water content to form a coating film.

≪ Test Example 2 &

In Test Example 2, in order to compare the physical properties of the surface-treated structures using the coating compositions prepared according to Example 1, Example 2, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4, Tests were conducted to compare the meter hardness, the tensile strength, the bending strength, the compressive strength and the tensile bond strength.

The durometer hardness was measured by the ASTM D2240-05 test method, the tensile strength was measured by the KSM ISO 527-2: 2013 test method, and the tensile strength test was conducted by using three IB type test specimens at a speed of 5 mm / min . In addition, bending strength and compressive strength were measured by KS M 3015: 2003 test method, tensile bond strength was measured by KS M 3722: 2008 test method, and three test specimens were used. For more accurate test values, each test was repeated 5-10 times and the average value is shown in Table 2 below.

Test Items Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Durometer hardness (-) 87 92 60 73.3 74 80 Tensile strength (N / m ² ) 55.2 63 47 34 32 52 Bending strength (N / m ² ) 95.6 98 75 74 79 90 Compressive strength (N / m ² ) 207 220 130 156 160 180 Tensile Adhesion Strength (N / m ² ) 36.8 42 29.8 21.5 20 32

As shown in Table 2, it can be seen that Examples 1 and 2 prepared by mixing the components at the composition ratios shown in the present invention have better physical properties than Comparative Examples 1, 2, 3 and 4. First, comparing the Example 1 and the Example 2, it was found that when the same coating composition was repeatedly applied to increase the thickness of the coating film, the strength and hardness were measured to be higher, and the coating composition was repeatedly applied one or more times The strength of the surface can be improved. Further, in Examples 1 and 2 using meta xylene diamine as a curing agent as shown in Table 1, it was hardened even on the surface of the structure in wet state to have a good strength and hardness, It can be seen that Example 1 has a lower strength and hardness than those of Examples 1 and 2 as the characteristics of the coating film formed on the surface of the structure are lowered due to insufficient curing on the wet surface.

Comparison of Examples 1 and 2 and Comparative Example 3 reveals differences in physical properties depending on the use of butadiene-acrylonitrile rubber. Unlike Examples 1 and 2, butadiene-acrylonitrile rubber was not used in Comparative Example 3. As shown in Table 2, in the case of Examples 1 and 2 in which the butadiene-acrylonitrile rubber was used, in Comparative Example 3 in which the butadiene-acrylonitrile rubber was not used but had excellent tensile strength and tensile adhesion strength, 1 and 2, respectively. Accordingly, Examples 1 and 2 can be judged to have a high tensile strength by using the butadiene-acrylonitrile rubber, which is improved in flexibility and elongation.

Comparing Examples 1 and 2 and Comparative Example 4, it can be seen that the strength and hardness of Examples 1 and 2 are superior to those of Comparative Example 4 in which no filler is used. That is, in the case of Comparative Example 4, since the filler that improves the mechanical strength is not used, it can be judged that the strength and hardness are lower than those of Examples 1 and 2. Accordingly, it is considered that the filler is added to the coating composition in a small amount but enhances the strength and hardness of the coating composition.

≪ Test Example 3 >

In Test Example 3, in order to compare the chemical resistance of the surface-treated structures according to Examples 1 and 2 and Comparative Examples 1, 2, 3 and 4, tests were conducted to compare the acid resistance, alkali resistance, water resistance and salt resistance. The surfaces of the concrete water tanks were treated according to Examples 1 and 2 and Comparative Examples 1, 2, 3 and 4, respectively, and then a 5% sulfuric acid solution (acidic), a 5% sodium hydroxide solution (alkaline), distilled water Neutral) and 10 L of 10% sodium chloride solution (salt tolerance). After standing for about 7 days, the solution was removed and the coating film on the surface of the concrete tank was observed. Herein, the acid resistance refers to a property of a structure to withstand a high acidity, and the alkali resistance refers to a property to withstand an alkali such as an alkali aqueous solution and an alkali vapor, and a water resistance property refers to a property of not wetting or water-

Acid resistance Alkali resistance Water resistance Salt resistance Example 1 Good Good Good Good Example 2 Good Good Good Good Comparative Example 1 Cracking Cracking and lifting Fine crack origin Cracking Comparative Example 2 Minor cracking Minor cracking Fine crack origin Cracking Comparative Example 3 Cracking and lifting Cracking and lifting Cracking Cracking and lifting Comparative Example 4 Cracking and lifting Cracking and lifting Cracking Cracking and lifting

As shown in Table 3, it can be seen that when the surface is treated according to Examples 1 and 2, it has better chemical resistance than the surface treated according to Comparative Examples 1, 2, 3 and 4. In Examples 1 and 2, it can be seen that the acidic solution, the alkaline solution, the neutral solution, and the salt solution exhibit a satisfactory state without any problems such as cracks in the coating film or coatings. On the other hand, in the case of Comparative Examples 1, 2, 3 and 4, fine cracks were formed in the coating film, or the coating film was lifted from the surface of the structure. It can be seen that the chemical compositions of the coating compositions prepared at the composition ratios shown in Examples 1 and 2 are better than those of Comparative Examples 1, 2 and 3 , And 4 can be judged to have poor chemical resistance and corrosion resistance.

<Test Example 4>

In the test examples, the test was carried out using the test method of KS F 4929: 2010 for comparison of the impact resistance of the surface-treated structure according to Examples 1 and 2 and the surface-treated structure according to Comparative Example 2, The results are shown.

Example 1 Example 2 Comparative Example 2 Coat state No separation of crack and film No separation of crack and film Creation of cracks and separation of coating layer and layer

The results of Table 4 indicate that the structure treated with the surface according to Examples 1 and 2 does not crack or segregate the coating film formed on the surface of the structure and thus has excellent impact resistance. On the other hand, in the case of the structure having the surface treated according to Comparative Example 2, cracks were formed in the coating film formed on the surface of the structure, and some coating films were separated. Particularly, Example 2 and Comparative Example 2 were repeatedly applied twice using the same paint composition, in Example 2, the paint composition was repeatedly applied at intervals of 10 hours, while in Comparative Example 2, the paint composition was applied repeatedly at intervals of about 20 hours There is a difference. As shown in Table 4, in Example 2, there was no cracking and separation of the coating film, but in Comparative Example 2, the cracks of the coating film and the coating layer and the layer were separated.

That is, the coating composition is semi-solidified after 8 to 12 hours of application, so that a uniform coating film is formed without forming a coating composition and a layer to be additionally applied as a semi-solid state, It is judged that the layer is not separated. However, when the coating is repeatedly applied at intervals of 20 hours as in Comparative Example 2, a boundary between the coating layers is formed and it is judged that the coating layer and the layer are separated by an external impact. Accordingly, when the coating composition is repeatedly applied at intervals of 8 to 12 hours as in the case of Example 2, the impact resistance of the coating film can be further improved.

&Lt; Test Example 5 >

In Test Example 5, the test was conducted by the test method of KS F 4929: 2010 in order to test whether or not the harmful volatile component of the coating composition prepared according to Example 1 was detected. The presence of mercury, benzene, phenols, etc. corresponding to the main harmful volatile components was confirmed and the results are shown in Table 4. Mercury and cyan are (23 ± 2) ° C, (40 ± 5)% R.H. The test was performed in the test environment and the remaining components except for mercury and cyanide were (23 ± 1) ℃, (40 ± 5)% R.H. Tests were conducted in a test environment.

Test Items Test result Test Items Test result Mercury Non-detection Phenols Non-detection draft Non-detection Epichlorohydrin Non-detection Dichloromethane Non-detection Vinyl acetate Non-detection 1,1,1-trichloroethane Non-detection Styrene Non-detection 1,1,2-trichloroethane Non-detection 1,2-butadiene Non-detection benzene Non-detection 1,3-butadiene Non-detection 1,1-dichloroethylene Non-detection N, N-dimethylaniline Non-detection 1,2-dichloroethane Non-detection 2,4-Toluenediamine Non-detection Cis-1,2-dichloroethylene Non-detection 2,6-Toluenediamine Non-detection Trichlorethylene Non-detection Toluene diisocyanate Non-detection Tetrachlorethylene Non-detection

[Table 5] shows that no harmful volatile components such as mercury, cyanogen, benzene, styrene, and phenols were detected in the coating composition prepared according to Example 1, so that an environmentally friendly coating composition can be prepared according to Example 1 It is believed that eco-friendly construction using this system is possible.

The present invention has been described above with reference to preferred embodiments and test examples. The present invention has been specifically described by way of Examples and Test Examples, but is not intended to limit the present invention, but merely to illustrate the present invention. Therefore, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these embodiments in accordance with the gist of the present invention. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

10: preprocessing step
20: mixing step
30: application step
40: Coating step

Claims (6)

A curable coating composition for a wet surface,
A subject comprising a bisphenol-A type epoxy, butadiene-acrylonitrile rubber, calcium carbonate, a diluent, and a filler; And
A curing agent comprising an amine-based material,
Wherein the curing agent is applied to the surface of the structure by mixing 20 to 30 parts by weight of the curing agent with respect to 100 parts by weight of the subject. The method according to claim 1,
The subject matter is based on a mixture of 35 to 50% by weight of bisphenol A epoxy, 5 to 15% by weight of butadiene-acrylonitrile rubber, 35 to 45% by weight of calcium carbonate, 0.1 to 2.5% by weight of diluent and 3.1 to 5.3% Mixed,
Is mixed at a ratio of 35 to 50% by weight of the bisphenol A type epoxy, 5 to 15% by weight of butadiene-acrylonitrile rubber, 35 to 45% by weight of calcium carbonate, 0.1 to 2.5% by weight of a diluent and 3.1 to 5.3% Wherein the curing agent is mixed in a ratio of 20 to 30 parts by weight with respect to 100 parts by weight of the subject. The method according to claim 1,
Wherein the amine-based material comprises meta xylene diamine (Meta Xylene Diamine). The method according to claim 1,
Wherein the filler is a mixture comprising at least one of clay, carbon black, titanium oxide, and silica. A method for treating a surface of a structure using the wetting-surface curable coating composition of claim 1,
A mixing step (20) of forming a coating composition by mixing 20 to 30 parts by weight of the curing agent of claim 1 with 100 parts by weight of the subject matter of claim 1;
An application step (30) of applying the coating composition to the surface of the structure at least once; And
(40) for forming a coating film on the surface of the structure by curing the coating composition applied on the surface of the structure,
In the mixing step 30, 35 to 50 wt% of bisphenol A epoxy, 5 to 15 wt% of butadiene-acrylonitrile rubber, 35 to 45 wt% of calcium carbonate, 0.1 to 2.5 wt% of diluent, % By weight of the curing agent is mixed with the curing agent in a proportion of 20 to 30 parts by weight based on 100 parts by weight of the mixture. 6. The method of claim 5,
In the application step 30,
The coating composition is repeatedly applied to the surface of the structure at least once at intervals of 8 to 12 hours,
In the coating film forming step (40)
Characterized in that the coating composition applied to the surface of the structure is cured for at least 24 hours.

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