KR101596204B1 - Waterproof and anti-corrosion skincoated-material for water antipollution and method of use thereof - Google Patents

Abstract

The present invention relates to a skin coating material of a concrete structure for preventing water contamination, and to a waterproof and anti-corrosion method using the same. The skin coating material comprises: a liquid-phase latex constituted of 40-50 wt% of a synthetic product of a styrene copolymer and 1,3-butadiene, and 50-60 wt% of water; and inorganic powder constituted of 20-30 wt% of calcium oxide (CaO), 25-35 wt% of silica (SiO_2), 15-25 wt% of aluminium oxide (Al_2O_3), 2-5 wt% of calcium hydroxide (Ca(OH)_2), 10-15 wt% of calcium carbonate (CaCO_3), 1-5 wt% of RDP, 0.5-2 wt% of an antioxidant, and 0.5-2 wt% of zinc oxide. The skin coating material is capable of improving an adhesion force with the base surface of the concrete, and preventing the delamination and the detachment of a film when moving the concrete and generating cracks, by being closely penetrated into a pore formed on the base surface of the concrete.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin coat material for preventing water pollution of a concrete structure, and a waterproof method using the skin coat material.

The present invention relates to a skin coat material for preventing water pollution of a concrete structure, and a waterproofing method using the skin coat material. More particularly, when a skin coat material having excellent adhesion to a material and excellent workability is formed and applied to a concrete structure, It is easy to adjust the surface roughness. It has excellent adhesion with the material to be coated subsequently. It prevents the coating from being peeled off, prevents contamination of paint film from water and other pollutants, has antimicrobial effect, And to a waterproof method using the skin coat material.

Generally, a concrete structure such as a water purification plant, a water tank, and a drain can be directly contacted with water or exposed to a high level of moisture, so that when a crack occurs on the surface of a concrete structure, a larger amount of moisture can penetrate through the concrete structure.

Water penetration into the concrete structure weakens the structural strength, and there is concern about corrosion of the reinforcing bars and the like.

In addition, the concrete water shows strong alkalinity of pH 12.5 or more due to the calcium hydroxide generated from the hydration of the cement.

The pH in the pores is lowered due to the formation of calcium carbonate by bonding with carbon dioxide in the air (it is known that the pH is 8.3 when the cement paste is completely neutralized). Neutralization does not progress in the dry concrete because of the presence of water in this reaction. Neutralization is difficult to occur because the diffusion of carbon dioxide gas is inhibited when the humidity is high and water is held in the pores. The relative humidity at which neutralization is most likely to proceed is 50 to 60%.

The water phase of the waterworks facility is not always in contact with water, but the humidity is relatively high, so that depending on environmental conditions, the neutralization proceeds and the corrosion of the reinforcing bars in the concrete is weakened.

Further, the chlorine agent used for disinfection of water becomes a gas in the liquid and is released to the vapor phase. The released chlorine gas penetrates into the concrete without condensation to promote neutralization and corrode the reinforcing bars in the concrete. Since the rebar in dry concrete is in an alkaline environment, the surface of the rebar forms a passive film and does not cause corrosion.

However, if chlorine ions reach the surface of the reinforcing bar after chloride penetration from the outside after curing, the passive film is broken and corrosion occurs.

In addition, the liquid phase portion contains carbonic acid (weak acid) in which carbon dioxide dissolves in water. Carbonic acid acts on the calcium in the concrete to form insoluble neutral carbonate (CaCO3) in the water to tighten the concrete structure. When carbonic acid additionally acts, the acid becomes acidic salt (Ca (HCO3) 2).

In addition, when concrete is in contact with water for a long period of time, liquefied chlorine used for disinfection of tap water is eroded on the surface of the concrete, and the softened portion appears. This is because the cement hardener is decomposed by acid and loses its fixing ability and a soft tissue layer is formed. Also, when the softened layer on the surface of the concrete flows out by water, the aggregate which is hardly eroded by the acid is exposed.

When there are defects such as cracks in the concrete structure, as the erosive water penetrates into the inside, the steel is also corroded.

Therefore, reinforcing the material properties of concrete itself or securing the watertightness through construction management is a necessary condition for the structure method, and it is not enough for the fundamental method measures.

In order to secure the comprehensive stability of water treatment facilities and to eliminate the factors that impede stability by producing and supplying clean drinking water in advance, and to increase the durability of concrete structures, proper waterproofing works are required.

Therefore, the waterproofing technique is generally applied to the inside of the concrete structure, and proper waterproofing structure should be applied and maintained in order to maintain the durability and water quality stability of the concrete structure from various external factors.

However, the conventional waterproofing method comprising the desk adjuster and the coating material has problems in terms of stretchability against cracking and adhesion to the concrete base.

That is, the background adjusting material of the conventional concrete structure is not easily penetrated into the micro cracks or pores generated on the concrete base surface, so that when the concrete structure is subjected to the behavior, There is a problem that the desk adjusting material easily peels off.

In addition, the conventional desk adjusting material has a problem in that the surface of the desk adjusting material is not smooth and the adhesion with the coating layer applied on the top surface of the desk adjusting material is lowered. There is a problem in that the substrate adjusting material and the coating layer easily peel off or fall off due to an external environmental factor acting on the concrete structure such as the behavior of the floor adjusting material and the coating layer or an internal environmental factor due to the temperature difference between the inside and outside

As a result, existing waterproofing technologies for concrete structures include technologies using metal and ceramic tiles, and the like. However, when the conventional waterproofing technology as described above is applied, there is a problem that a great maintenance cost is additionally generated in the long term .

SUMMARY OF THE INVENTION The present invention has been devised in order to solve the above-mentioned problems, and it is an object of the present invention to develop a skin coat material capable of enhancing adhesion with the concrete base surface by being densely penetrated into voids formed on a concrete base surface, The skin coat material reinforces the adherence to the material so that it is densely penetrated into the cracks and voids when it is applied to the surface of the concrete, and it can be easily and strongly attached to the coating film applied in the subsequent work after the curing, The present invention provides a skin coat material for preventing contamination of a concrete structure in water, which is intended to prevent peeling and dropping of a coating film when it occurs.

Particularly, since the skin coat material is smoothly applied to the concrete surface to form a skin coat, it is easy to adjust the roughness, thereby lowering the contamination rate due to water and other pollutants caused by contact with water, The present invention provides a skin coat material for preventing pollution of a concrete structure of a concrete structure and a waterproofing method using the skin coat material so that a cleaning operation can be performed simply by water washing.

The above-mentioned object is achieved by a process for preparing a liquid latex comprising 40 to 50% by weight of a compound of a styrene copolymer and 1,3-butadiene, and 50 to 60% by weight of water, ; 20-30 wt% of calcium oxide (CaO), 25-35 wt% of silica (SiO ₂ ), 15-25 wt% of aluminum oxide (Al ₂ O ₃ ), calcium hydroxide (Ca (OH) ) ₂₎ 2 to 5% by weight of calcium carbonate _{(calcium carbonate, CaCO 3) 10} ~ 15 % by weight, N- oxide tilt Rie silane (N-Octyltriethoxysilane) 1 ~ 5% by weight, anti-aging agent 0.5 to 2% by weight, 0.5 to 2% by weight of zinc oxide; Wherein the latex, the water and the inorganic powder are mixed in a weight ratio of 1: 1: 5.

Here, the latex is formed by mixing one or more of acrylic latex having a particle size of 100 nm to 200 nm, 20 to 30% by weight of a nano emulsion latex, and hybrid polymer latex.

According to another aspect of the present invention, there is provided a method of manufacturing a concrete structure, the method comprising: removing a foreign substance from a surface of a concrete structure; Applying a skin coat material according to any one of claims 1 to 1.5 to 2 kg / m 2 to the surface-treated adherend surface to form a thin film skin coat having a thickness of 1000 μm to 1300 μm; A primary drying step of drying the skin coat at a temperature of 5 ° C to 36 ° C for 8 to 10 hours after the formation of the skin coat; After the primary drying step, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with an epoxy having an equivalent weight of 150 to 450 g / eq, To 12% by weight of epoxy; and 88 to 90% by weight of epoxy, followed by coating on a skin coat to form a primary coating film having a thickness of 70 μm to 90 μm; A secondary drying step of drying the primary coating film at a temperature of 5 ° C to 36 ° C for 8 to 10 hours after the primary coating step; After the secondary drying step, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with an epoxy having an equivalent weight of 150 to 450 g / eq, To 8% by weight of epoxy; 92 to 93% by weight of epoxy; and applying the mixture to the top of the primary coating to form a secondary coating having a thickness of 120 to 150 탆; A third drying step of drying the second coating film at a temperature of 5 ° C to 36 ° C for 8 to 12 hours after the second coating step; After the tertiary drying step, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed into an epoxy having an equivalent weight of 150 to 450 g / eq, To 5% by weight of epoxy, and 95 to 96% by weight of epoxy, and then applying the mixture to an upper part of the secondary coating to form a tertiary coating having a thickness of 140 to 160 탆. But also by a waterproof method using a skin coat material for preventing water pollution.

The present invention provides a skin coat which is firmly adhered to a surface of a concrete to be adhered by reinforcing the adhesion property of the skin coat material by firstly adjusting the roughness by densely penetrating the pores formed on the concrete base surface, Since the adhesive force is excellent, adhesion with the primary coating film to be coated subsequently is strengthened, so that peeling and detachment due to the behavior of the base surface are prevented.

The acrylic latex and nano-emulsion latex can improve long-term durability while providing excellent adhesion through good packing effect of polymer particles, and penetrate better into the pores of concrete structures to provide better adhesion.

In addition, by applying the above-mentioned skin coat smoothly on the adhered surface, the skin coat having the adjusted roughness is formed on the concrete adhered surface, and the epoxy mixture is applied in the primary, secondary and tertiary order. The thickness of the coating film is gradually thickened so that the control of the roughness is smoothly performed, the water contamination rate due to water or other contaminants is reduced during the water contact so as to have stain resistance, and a simple and excellent coating film So that the maintenance cost can be reduced.

Hereinafter, a waterproofing method using a skin coat material for preventing water pollution of a concrete structure according to the present invention and a skin coat material will be described in detail.

First, the skin coat material according to the present invention is prepared by mixing 1: 1: 5% by weight of a liquid latex: water: inorganic powder.

The liquid latex is composed of an acrylic latex having a particle size of 100 nm to 200 nm, 20 to 30% by weight of a nano-emulsion latex, and a hybrid polymer latex.

Here, the nano-sized acrylic latex or nano-emulsion latex may be used alone or in combination with a general acrylic latex, so that it can penetrate into the pores of the concrete structure to provide more improved adhesion force , Since the particle size of the latex is small, the adhesion and binding force of each coating film is excellent, and the adhesion force for a long period of time is improved.

And, a hybrid polymer called a core cell improves the resistance to floating water under freezing / thawing conditions.

The liquid latex is composed of 40 to 50% by weight of a styrene copolymer or a mixture of a styrene copolymer and 1,3-butadiene, and 50 to 60% by weight of water.

The styrene copolymer generally forms a water-insoluble film by forming an impermeable film which is substantially insoluble on an object, 1,3-butadiene is a butadiene-styrene rubber and a foaming agent It is an alkene compound used in the production of chemicals and resins. It is used as a raw material for synthetic rubber.

In the present invention, it is made of a butadiene-styrene copolymer elastomer together with a styrene copolymer, and penetrates intensely into cracks and grooves of a concrete structure during a skin coat and forms a film on the surface of a concrete structure to ensure waterproofness.

The styrene copolymer or the styrene copolymer and 1,3-butadiene in the liquid latex preferably have a composition of 40 to 50% by weight, and when added in an amount of less than 40% by weight, When added in an amount of more than 50% by weight, the flowability is so improved that a falling phenomenon occurs on the adhered surface.

The amount of water in the liquid latex is preferably from 50 to 60% by weight. When less than 50% by weight is added, the viscosity of the liquid latex is increased to lower workability and permeability. When the amount exceeds 60% by weight, The workability is deteriorated due to the phenomenon of flowing down from the adhered surface.

The inorganic powder may include 20 to 30% by weight of calcium oxide (CaO), 25 to 35% by weight of silica (SiO ₂ ), 15 to 25% by weight of aluminum oxide (Al ₂ O ₃ ) 2 to 5 wt% of calcium hydroxide, Ca (OH) ₂ , 10 to 15 wt% of calcium carbonate (CaCO ₃ ), 1 to 5 wt% of RDP, 0.5 to 2 wt% of an antioxidant, By weight.

Among the above-mentioned inorganic powders, calcium oxide (CaO) is also referred to as lime and quick lime. The pure one is a white crystal of equiaxed crystal system and has a melting point of 2,570 ° C. When left in the air, it absorbs water and carbon dioxide and decomposes into calcium hydroxide (calcium hydroxide) and calcium carbonate. In addition, when water is activated, heat is generated and calcium hydroxide is formed.

The calcium oxide is added in an amount of 20 to 30% by weight based on the total weight of the inorganic powder. When the calcium oxide is less than 20% by weight, the weight of the calcium oxide is less than the weight of the calcium oxide. do.

Silica in the inorganic powder according to the present invention is sometimes referred to as silicon dioxide or silicic anhydride as an alias of silicon dioxide (SiO ₂ ). It is a major component of rocks and earths, and is contained in trace amounts in the form of ionic colloid in natural water.

The silica gel which is dehydrated and made into a granular form is called an excellent adsorbent. It can be used for adsorption and recovery of moisture and solvent. When the amount is less than 20% by weight, It is because it is difficult to expect the effect. If it is more than 70% by weight, the use amount is too much, and it is difficult to sufficiently secure physical properties such as elasticity, elongation ratio and adhesive strength of the product.

Since the silica is a filler reinforcing mechanical strength and has a small thermal expansion coefficient and excellent mechanical strength, the silica is mixed with the silica in the present invention, thereby reinforcing the strength by increasing the mechanical strength.

As the silica, aluminum silicate, magnesium silicate, and calcium silicate can be used in particular, and it is preferable that they are mixed in a ratio of 25 to 30% by weight based on the total weight of the inorganic powder. If the amount of the silica is less than 25% by weight, the effect of crude steel is insignificant. If the amount of the silica exceeds 30% by weight, the price increases greatly and the manufacturing cost increases.

Aluminum oxide of the inorganic powder according to the invention _{(Aluminium Oxide, Al 2 O 3} ) is an oxide of aluminum (Al ₂ O _3), it refers to a-alumina. It is also the main component of aluminum ore. It is mechanically strong and has excellent chemical resistance, which helps to protect the inside.

Particularly, aluminum oxide forms a strong, corrosion-resistant and water-resistant coating on the surface of concrete, thereby exhibiting an excellent effect in preventing and inhibiting corrosion of reinforcing bars inside the concrete structure, and contributing to improvement of the water-resistance and abrasion resistance of the coating.

The aluminum oxide can be used for curing very quickly and has a strong characteristic in water. In addition, the aluminum oxide protects the inner reinforcing bars of the concrete structure by the coating, and the aluminum oxide coating is effective in preventing the penetration of air and strengthening corrosion resistance and waterproofing property

The aluminum oxide (alumina) is used as a material for prevention of erosion of materials and as a dispersing medium, it prevents shrinkage and expansion of concrete by preventing temperature rise of the adherend due to excellent thermal stability and prevents neutralization / If the content of the inorganic powder is less than 15% by weight based on the total weight of the inorganic powder, the skin coat material tends to be eroded and the ingredients are not mixed evenly therein.

Calcium hydroxide (Ca (OH) ₂ ) in the composition of the inorganic powder according to the present invention is a hydroxide of calcium and is a basic compound in the form of a white powder. It is used for the detection of carbon dioxide and for reducing the greenhouse effect by carbon dioxide, When the content is less than 2% by weight, hardening is not satisfactory. When the content is more than 5% by weight, the skin coat formed after application of the skin coat material becomes too hard .

On the other hand, the water-soluble medium is formed into insoluble calcium silicate by the reaction of the silica and the calcium hydroxide to perform a waterproof function, and the cured skin coat is formed into a hydrophobic film having air permeability and antibacterial property.

A reaction formula in which silica and calcium hydroxide react to form insoluble calcium silicate is as follows.

SiO ₂ + Ca (OH) _{2 -} > Ca ₂ SiO ₄ + H ₂

When the calcium hydroxide is converted into insoluble calcium carbonate by the reaction of carbon dioxide and the reaction is semi-permanently maintained, the process is the same as that of the generation of class seasons, so that the durability is semi-permanent and the continuity of the waterproof property is further improved

The reaction formula in which the calcium hydroxide reacts with carbon dioxide to become insoluble calcium carbonate is as follows.

_{Ca (OH) 2 + CO 2} → CaCO 3 + H 2 0

Therefore, the present invention has a remarkable effect that it has antibacterial property, warmth property and nonflammability without using an emulsifier and a surfactant.

Calcium carbonate (CaCO ₃ ) in the composition of the inorganic powder according to the present invention can fill the voids generated in the composition, increase the volume and can form a certain thickness, and can serve as an extender.

The above-mentioned calcium carbonate is economically advantageous than using one or more selected from the group consisting of carbon black, white carbon, silica fume and meta kaolin, and is preferably included as one of the constituent materials of the present invention

The calcium carbonate is used for improving the moisture resistance, durability, weather resistance, impact resistance, chemical resistance and protecting the coating film from ultraviolet rays.

At this time, the calcium carbonate is contained in the skin coat material so that the particles, preferably the powder particles, float on the surface of the skin coat during drying to form a dense and hard skin coat, and the permeation of water vapor and other gases and liquid Durability, weather resistance, impact resistance and chemical resistance, and can protect the skin coat from ultraviolet rays by reflecting light.

The calcium carbonate may be any calcium carbonate commonly used in the art, but it is preferable to use calcium carbonate having an average particle diameter of 500 to 1000 nm.

If the calcium carbonate is contained in an amount of less than 10% by weight based on the total weight of the inorganic powder, its role as an extender is insufficient. If the calcium carbonate is contained in an amount exceeding 15% by weight, It is impossible to achieve the effect of the present invention.

N-octyltriethoxysilane among the inorganic powders according to the present invention is a powdery silicone water repellent agent which improves the water repellency and reduces the water absorption of the composition and thus improves the workability and workability It prevents the aging of the entire structure of the concrete by blocking water from the outside and keeping air permeability. When the content is less than 1% by weight of the total weight of the inorganic powder, the effect is insignificant. When the amount exceeds 5% by weight, 1% by weight to 5% by weight is suitable.

The antioxidant in the inorganic powder according to the present invention uses alum, and the alum also has antimicrobial activity. If the alumina powder is less than 0.5% by weight based on the total weight of the inorganic powder, the skin coat tends to be aged. If the alumina powder is more than 2% by weight, the production cost becomes high. Titanium dioxide can be used for the same purpose in place of white algae.

The zinc oxide in the inorganic powder according to the present invention is naturally produced as iron oxide and is industrially produced by burning zinc oxide or zinc nitrate by heating the metal zinc to vaporize it, If the amount of the inorganic powder is less than 0.5% by weight, the antibacterial activity is lowered. If the amount of the inorganic powder is more than 2% by weight, the manufacturing cost is increased.

As described above, the skin coat material according to the present invention is prepared by mixing latex, water, and inorganic powder in a ratio of 1: 1: 5 by weight, thereby achieving an excellent packing effect of polymer particles by acrylic latex and nano-emulsion latex It can improve long-term durability while providing adhesive force. It penetrates better into the voids of concrete structures and has better adhesion strength and denser penetration into the pores of concrete structures to adjust the roughness, and is strongly attached to the surface of the concrete structure Since the formed skin coat is excellent in adhesion of the material, the adhesion force with the primary coating film to be coated subsequently is strengthened, thereby preventing peeling and dropout due to the behavior of the base surface.

The waterproofing method using the skin coat material for preventing water pollution of the concrete structure according to the present invention will be described as follows.

First, the step of removing the foreign matter from the surface of the concrete structure to perform the surface treatment is performed to smooth and uniform the surface of the surface of the concrete structure.

The surface of the skin-coated surface is coated with 1.5 to 2 kg / m 2 of a skin coat material mixed at a weight ratio of 1: 1: 5 latex: water: inorganic powder as described above A step of forming a thin film skin coat of 1000 mu m to 1300 mu m is carried out.

The skin coat material is densely penetrated through the surface of the surface treated with the skin coat to obtain an improved adhesion, and the liquid latex is mixed with the inorganic powder to become an insoluble material. The water-soluble medium is formed as insoluble calcium silicate to perform the waterproof function, and at the same time, the cured film is formed into a hydrophobic water-proof film having air permeability and antibacterial property.

In the pores of the above-mentioned concrete structure, calcium hydroxide is converted into insoluble calcium carbonate by the reaction of carbon dioxide, and the reaction is semi-permanently maintained, And the adhesive force on the adherend surface is firmly established.

When the step of forming a skin coat as described above is carried out, a primary drying step of drying the skin coat at a temperature of 5 ° C to 36 ° C for 8 to 10 hours is carried out so that the reaction and curing of the skin coat material mixture are naturally It is preferable to make it possible.

After the primary drying step, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with an epoxy having an equivalent weight of 150 to 450 g / eq, 10 to 12% by weight of the mixture is mixed with 88 to 90% by weight of epoxy, and the mixture is applied to a skin coat to form a primary coating film having a thickness of 70 to 90 탆.

As described above, the skin coat formed by the step of forming the skin coat has a strong adhesion to the adhered surface, and the skin coat composition is excellent in adhesion to the material as mentioned in the description. Therefore, The coating film is attached more strongly to the skin coat so that the integral structure is not formed, so that the problem of peeling off or dropping of the concrete structure is not caused.

As described above, in the primary coating step of forming the primary coating film, the epoxy mixture is coated to a thickness of 70 탆 to 90 탆 relatively thinner than the secondary and tertiary coating steps to be described later.

After the primary coating step, a secondary drying step of drying the primary coating film at a temperature of 5 ° C to 36 ° C for 8 to 10 hours is performed, and after the secondary drying step, methyl isobutyl ketone, And methyl ethyl ketone were mixed in an epoxy equivalent weight of 150 to 450 g / eq, and the mixture was mixed in an amount of 7-8 wt%: epoxy 92-93 wt% A second coating step of applying a coating solution on the top of the primary coating film to form a secondary coating film is carried out.

The secondary coating film formed on the upper side of the primary coating film after the formation of the primary coating film is coated with a relatively thicker thickness of 120 탆 to 150 탆 than the primary coating film to form a secondary coating film, One more hold allows the surface to be smoothed more smoothly.

After the second coating step, the second coating layer is dried at a temperature of 5 ° C to 36 ° C for 8 to 12 hours, followed by a third drying step. Then, methyl isobutyl ketone and methyl ethyl ketone Ethyl Ketone) is mixed with an epoxy having an equivalent weight of 150 to 450 g / eq, the mixture is mixed with 4-5 wt%: epoxy 95-96 wt%, and then applied onto the second coating layer Thereby performing a third coating step of forming a third coating film.

Even in the process of forming the third coating film, the thickness of the third coating film is formed to be relatively thicker than the thickness of the second coating film 140 to 160 탆 thick, and the surface of the third coating film is formed into a glossy shape .

In the first, second and third coating steps, the mixing ratio of the epoxy and the mixture forming each coating film is different from each other. Since the viscosity of the epoxy mixture applied in the secondary coating is higher than that of the epoxy mixture applied in the primary coating, Since the internal resistance to flow is higher and the viscosity of the epoxy mixture applied in the third order is higher than the epoxy mixture applied in the second order, the internal resistance to the flow is higher, so that the primary, secondary, The surface of the coating film can be formed more smoothly.

Claims (3)

40 to 50% by weight of a mixture of a styrene copolymer and 1,3-butadiene, and 50 to 60% by weight of water;
20-30 wt% of calcium oxide (CaO), 25-35 wt% of silica (SiO ₂ ), 15-25 wt% of aluminum oxide (Al ₂ O ₃ ), calcium hydroxide (Ca (OH) ) ₂₎ 2 to 5% by weight of calcium carbonate _{(calcium carbonate, CaCO 3) 10} ~ 15 % by weight, N- oxide tilt Rie silane (N-Octyltriethoxysilane) 1 ~ 5% by weight, anti-aging agent 0.5 to 2% by weight, 0.5 to 2% by weight of zinc oxide;
Wherein the latex, the water and the inorganic powder are mixed in a weight ratio of 1: 1: 5. The method according to claim 1,
Wherein the latex comprises a mixture of one or more of acrylic latex having a particle size of 100 nm to 200 nm, 20 to 30 wt% of a nano-emulsion latex, and hybrid polymer latex. . Removing the foreign matter from the surface of the concrete structure to perform surface treatment;
Applying a skin coat material according to any one of claims 1 to 1.5 to 2 kg / m 2 to the surface-treated adherend surface to form a thin film skin coat having a thickness of 1000 μm to 1300 μm;
A primary drying step of drying the skin coat at a temperature of 5 ° C to 36 ° C for 8 to 10 hours after the formation of the skin coat;
After the primary drying step, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with an epoxy having an equivalent weight of 150 to 450 g / eq, To 12% by weight of epoxy; and 88 to 90% by weight of epoxy, followed by coating on a skin coat to form a primary coating film having a thickness of 70 μm to 90 μm;
A secondary drying step of drying the primary coating film at a temperature of 5 ° C to 36 ° C for 8 to 10 hours after the primary coating step;
After the secondary drying step, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with an epoxy having an equivalent weight of 150 to 450 g / eq, To 8% by weight of epoxy; 92 to 93% by weight of epoxy; and then coating the top of the primary coating to form a secondary coating having a thickness of 120 to 150 탆;
A third drying step of drying the second coating film at a temperature of 5 ° C to 36 ° C for 8 to 12 hours after the second coating step;
After the tertiary drying step, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed into an epoxy having an equivalent weight of 150 to 450 g / eq, To 5% by weight of epoxy, and 95 to 96% by weight of epoxy, and then applying the mixture to an upper part of the secondary coating to form a tertiary coating having a thickness of 140 to 160 탆. Waterproofing method using skin coat material to prevent water pollution.