KR101695598B1 - Skincoated-material and skincoated-epoxy for waterproof and anti-corrosion method - Google Patents

Abstract

The present invention relates to a water pollution prevention skin coat for concrete structures, and to a dual waterproofing method using skin coat epoxy. To this end, the water pollution prevention skin coat is produced by the following steps: forming a first primer layer by applying a skin coat primer on a coating surface; forming a thin skin coat layer by applying the skin coat on the first primer layer; a primary drying step of drying the skin coat; forming a second primer layer by applying a water-soluble skin coat epoxy primer on the skin coat layer; a primary application step of forming a skin coat epoxy primary coating film on the second primer layer; a secondary drying step of drying the skin coat epoxy primary coating film; a secondary application step of forming a skin coat epoxy secondary coating film on an upper portion of the skin coat epoxy primary coating film; a tertiary drying step of drying the skin coat epoxy secondary coating film; and tertiary application step of forming a skin coat epoxy tertiary coating film on an upper portion of the skin coat epoxy secondary coating film.

Description

{SKINCOATED-MATERIAL AND SKINCOATED-EPOXY FOR WATERPROOF AND ANTI-CORROSION METHOD USING SCREEN COATED SKIN COATED EPOXY}

The present invention relates to a dual waterproofing method using a skin coat and a skin coat epoxy for preventing water pollution of a concrete structure. More particularly, the present invention relates to a skin coat and a skin coat epoxy which are more adhesive than a conventional epoxy coat By applying skin coat and skin coat epoxy with excellent adhesion to materials and excellent workability and applying skin coat to concrete structure, it is possible to double resistance to organic sulfuric acid corrosion by improving resistance against organic sulfuric acid corrosion performance, The skin coat epoxy improves the coefficient of expansion to improve the adhesion with the skin coat, thereby causing problems such as peeling of the coating film and the like. Prevents contamination, has antibacterial effect, and oxidizes by bacteria Of concrete structures that will be dropped on a double waterproof manner using a method for preventing water pollution and skin coat skin coat epoxy.

In general, concrete structures such as water purification plants, water tanks, sewage treatment plants, and sewer lines are directly in contact with water or exposed to high levels of moisture, so that when cracks occur on the surface of concrete structures, have.

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 concrete structure is not always in contact with the water, but the humidity is relatively high, which leads to neutralization of the reinforcing bars in the concrete due to environmental conditions.

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 an insoluble neutral carbonate (CaCO ₃ ) in the water to tighten the concrete structure. When carbonic acid additionally acts, it becomes a soluble acid salt (Ca (HCO ₃ ) ₂ ).

Considering that the durability performance limit of concrete is pH 4.5 and the organic sulfuric acid corrosion environment is about pH 1, corrosion of 11% of defects is caused mainly by concrete, (HS ₂ ) is released by anoxic bacteria in a sewer pipe and the released hydrogen sulfide (HS ₂ ) is adsorbed on the surface or crack part of the wet concrete, and the aerobic bacteria become sulfuric acid (H ₂ SO ₄ ) This acid will corrode the concrete as it progresses and oxidizes.

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 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, it is required to construct proper waterproofing methods.

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 background adjusting material has a problem in that it is difficult to construct the wet concrete structure in a wet state, thereby deteriorating adherence to the coating layer applied on the top surface of the background adjusting material. 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 substrate 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 .

On the other hand, when the skin coat is applied to the concrete structure, the applicant's registered patent No. 10-1621198 'Skin coat for preventing water pollution of concrete structure and waterproofing method using the same' It is easy to control pinholes, especially, it prevents contamination from water and other pollutants, has antimicrobial effect, prevents oxidation by bacteria and prevents corrosion of concrete, However, as described in the first application, it has been attempted to solve the problems such as detachment of the coating film due to its excellent adhesion with the subsequently applied coating material. However, in case of forming the coating film with epoxy, The adhesive force of the first applicant does not meet the intended adhesive force of the present applicant at first.

This problem is a subtle part that can only be done at the time of the worker's work in the waterproofing method, and when the difference in such subtle work is overlooked, the skin coat and the epoxy coating may lose their mutual attraction Resulting in shortening the durability of the product and causing a problem of rework or defects.

The above problem is caused by the fact that the expansion coefficient of the skin coat integrated with the mother or the mother is different from the expansion coefficient of the epoxy. The elastic modulus of epoxy distributed in the market is 1.5 ~ 2.5 × 10 ⁴ MPa, The skin coats integrated with concrete have elastic modulus of 4.5 ~ 5.5 × 10 ⁴ MPa, and thus have different strains for stress.

Therefore, as in the first application of the present application, the skin coat and the epoxy coating film for preventing water pollution of the concrete structure and the waterproofing method using the same are pre- There is a need to improve reliability and increase durability.

In order to solve the above-described problems, the present invention provides a skin coat and a skin coat epoxy composition having increased elastic modulus or elastic modulus to increase adhesion, increase water resistance, performance and durability, And the adhesion of the skin coat epoxy to the skin coat is improved by improving the resistance of the mother body to the organic sulfuric acid corrosion performance to prevent corrosion of the organic sulfuric acid and improving the waterproof property and the skin coat epoxy formed after application of the skin coat Thereby enhancing the adherence to the skin coat by increasing the expansion coefficient or the elastic modulus as well as protecting the skin coat, thereby preventing the coating film from falling off, preventing contamination of the coating film from water and other contaminants, Double waterproof to prevent oxidation process by bacteria, cone To provide a dual-mode process water contaminated with water-proof skin coat and epoxy coat the skin of discrete structures has its purpose.

According to the present invention, the above object can be achieved by a vinyl acetate ethylene copolymer (Vinyl Acetate Ethylene Polymer); 20 to 25% 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 ), calcium hydroxide ) 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, And 0.5 to 2% by weight of zinc oxide, and mixing the mixture at a weight ratio of vinyl acetate ethylene copolymer: water: inorganic powder = 1: 1: 5. It is accomplished by a coat.

The object of the present invention is to provide a method for manufacturing a concrete structure in which a surface of a concrete structure is assembled and a skin is formed by mixing a vinyl acetate ethylene copolymer and water in a ratio of 2: Coating a coat primer to form a first primer layer (4); Applying the skin coat to the first primer layer (4) at a coating rate of 1.5 to 2 kg / m < 2 > to form a thin film skin layer (6) having a thickness of 1000 mu m to 1300 mu m; A first 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 layer 6; Forming a second primer layer (8) by applying a water-soluble skin coat epoxy primer to the skin coat layer (6) when the skin coat layer (6) is dried; When the second primer layer 8 is dried, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with epoxy-based skin coat epoxy The mixture is mixed with 10 to 12% by weight of the mixture: 88 to 90% by weight of skin coat epoxy and then applied to the second primer layer 8 to prepare a skin coat epoxy primary coating film 10 having a thickness of 120 to 150 탆, A first coating step of forming a coating layer; A secondary drying step of drying the skin coat epoxy primary coating film 10 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 a skin coat epoxy composed mainly of epoxy, 7 to 8% by weight: skin coat epoxy mixed with 92 to 93% by weight, and then coated on top of the skin coat epoxy primary coating film 10 to form a skin coat epoxy secondary coating film 12 having a thickness of 100 to 120 탆 A second coating step of coating a second coating layer; A third drying step of drying the skin coat epoxy secondary coating film 12 at a temperature of from 5 ° C to 36 ° C for 8 to 12 hours after the secondary coating step; After the tertiary drying step, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with a skin coat epoxy composed mainly of epoxy, 4 to 5% by weight: skin coat epoxy mixed with 95 to 96% by weight, and then coated on top of the skin coat epoxy secondary coating 12 to form a skin coat epoxy tertiary coating film 14 having a thickness of 100 to 120 탆 And a second waterproofing method using a skin coat epoxy coat and a skin coat epoxy for preventing water contamination of a concrete structure.

Wherein the skin coat epoxy comprises 35 to 69% by weight of a bisphenol F type epoxy resin, 3 to 5% by weight of a silane compound, 1 to 25% by weight of an epoxy glycidyl ether, 26 to 36% by weight of a calcite, 0.1 to 0.3% by weight of amorphous silicon oxide, 0.1 to 5% by weight of phenol, and 0.05 to 20% by weight of an emulsifier; , 10 to 30% by weight of a reaction product of tall oil and fatty acid, 10 to 30% by weight of polyoxypropylene diamine and triethylenetetramine, 5 to 20% by weight of an emulsifier, 1 to 30% by weight of phenol 1 To 10% by weight of a curing agent. The above-mentioned curing agent and the curing agent are mixed in a weight ratio of 5: 1 before forming a waterproof coating film.

The present invention provides a skin coat epoxy having an increased elastic modulus or elastic modulus in order to enhance adhesion of a concrete structure or a concrete structure to an integrated skin coat, thereby improving resistance to organic sulfuric acid corrosion performance by a skin coat, It is possible to prevent double corrosion of sulfuric acid, to improve waterproof property, to achieve easy adjustment of roughness, to prevent antibacterial effect and to remove coating due to strong adhesion of skin coat epoxy which is applied subsequently, It is possible to prevent the contamination of the coating film from the material and to increase the durability and prolong the life of the product.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a dual waterproof structure formed by a double waterproofing method using a skin coat and a skin coat epoxy for preventing water pollution of a concrete structure according to the present invention. FIG.

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

First, a skin coat (hereinafter, referred to as a skin coat) for preventing water from becoming contaminant of a concrete structure according to the present invention is formed by mixing a vinyl acetate ethylene copolymer with an inorganic powder and water.

That is, the vinyl acetate ethylene copolymer: water: inorganic powder = 1: 1: 5 weight ratio.

The VAE (Vinylacetate-Ethylene-Copolymer) is a combination of a vinyl acetate monomer and an ethylene monomer. The sulfide and hydrogen sulfide (HS ₂ ) are released by anoxic bacteria inside a concrete sewer pipe, and hydrogen sulfide (HS ₂ ) is prevented from being adsorbed on the surface of wet concrete provided in watery concrete and sewage concrete, thereby preventing the progress of aerobic bacteria to sulfuric acid (H ₂ SO ₄ ) and preventing the oxidation process of aerobic bacteria To prevent corrosion of concrete caused by acid, and it has high durability against organic sulfuric acid corrosion because of excellent antimicrobial property, so that corrosion of concrete surface can be prevented.

The inorganic powder in the skin coat composition may contain 20-25% by weight of calcium oxide (CaO), 25-35% by weight of silica (SiO ₂ ), 15-25% 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 of N-octyltriethoxysilane 0.5 to 2% by weight of an antioxidant, and 0.5 to 2% by weight of zinc oxide.

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 25% by weight based on the total weight of the inorganic powder. If the calcium oxide is less than 20% by weight, the weight of the calcium oxide is less than the weight of the calcium oxide.

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 according to the present invention is prepared by mixing the vinyl acetate ethylene copolymer: water: inorganic powder in a weight ratio of 1: 1: 5, thereby obtaining a good adhesion property of the vinyl acetate ethylene copolymer particles, Thereby improving long-term durability and penetrating better into the voids of the concrete structure to more closely adhere to the voids of the concrete structure to adjust the roughness, and to strongly adhere to the adhered surface 2 of the concrete structure Since the skin coat adhered and formed is excellent in adhesion of the material, the adhesion force with the coating film to be subsequently coated is strengthened, thereby preventing peeling and dropout due to the behavior of the base surface.

The waterproof method using the skin coat and the skin coat epoxy for preventing pollution of the concrete structure according to the present invention will be described as follows.

First, when the adhered surface 2 of the concrete structure is assembled, a primer formed by mixing the above-mentioned vinyl acetate ethylene copolymer and water at a ratio of 2: 1 is applied to the surface-treated adhered surface 2 to form a first primer layer 4 ) Is formed.

When the first primer layer 4 is dried, the skin coat is applied to the first primer layer 4 at a coating rate of 1.5 to 2 kg / m 2 to form a thin film coat layer 6 having a thickness of 1000 to 1300 μm ) Is formed.

After the skin coat layer 6 is formed as described above, a primary drying step of drying the skin coat layer 6 at a temperature of 5 ° C to 36 ° C for 8 to 10 hours is performed.

When the skin coat layer 6 is dried, a step of forming a second primer layer 8 by applying a water-soluble skin coat epoxy primer to the skin coat layer 6 in order to improve adhesion with the coating film is carried out do.

The water-soluble skin-coat epoxy primer is generally referred to as a water-soluble epoxy primer, and may be used in place of a primer product. The epoxy primer may contain 60 to 70% by weight of epichlorohydrin-bisphenol A resin, 30 to 40% by weight of water, 7 to 15% by weight of a water-soluble epoxy primer (A) or cresol glycidyl ether having 1 to 3% by weight of nol, 7 to 15% by weight of a bisphenol A-bisphenol A diglycidyl ether polymer, 75 to 85% % Of water-soluble epoxy primer (B) may be adopted.

The selection of the above-mentioned water-soluble skin coat epoxy primer can be variously adapted and changed according to the construction environment, so the present invention is not limited thereto.

On the other hand, when the second primer layer 8 is dried, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with an epoxy- Mixed with 10 to 12 wt% of skin coat epoxy and 88 to 90 wt% of a mixture, and then coated on a skin coat to form a skin coat epoxy primary coating film 10 having a thickness of 120 to 150 탆 Car application step is carried out.

As described above, the skin coat layer 6 formed by the step of forming the skin coat layer 6 is strengthened in adhesion to the adhered surface 2, and the skin coat is excellent in adhesion to the material as described above The skin coat epoxy primary coating film 10 made of skin coat epoxy is more strongly adhered to the skin coat layer 6 on the upper part thereof to be unified to cause detachment or dropout of the behavior of the concrete structure .

Here, the skin-coat epoxy having the epoxy as the main constituent is composed of 35 to 69% by weight of a bisphenol F type epoxy resin, 3 to 5% by weight of a silane compound, 1 to 25% by weight of an epoxy glycidyl ether, 26 to 36% 0.5 to 1.5 wt% of a quaternary ammonium compound, 0.1 to 0.3 wt% of an amorphous silicon oxide, 0.1 to 5 wt% of phenol, and 0.05 to 20 wt% of an emulsifier; , 10 to 30% by weight of a reaction product of tall oil and fatty acid, 10 to 30% by weight of polyoxypropylene diamine and triethylenetetramine, 5 to 20% by weight of an emulsifier, 1 to 30% by weight of phenol 1 To 10% by weight of a curing agent. The above-mentioned curing agent and the curing agent are mixed at a weight ratio of 5: 1 before the formation of the waterproof coating film.

Hereinafter, the composition of the subject of the skin coat epoxy composition for preventing water pollution of the concrete structure according to the present invention will be described.

First, bisphenol F type epoxy resin as a main component of a skin coat epoxy composition for preventing pollution in water of a concrete structure according to the present invention is a diglycidyl ether of bisphenol F (DGEBF) of bisphenol F, ≪ / RTI > Generally, bisphenol F type epoxy resin has lower viscosity than bisphenol A type epoxy and has excellent chemical resistance, reactivity, corrosion resistance and flowability

The softening point of the bisphenol F type epoxy resin is determined by the size of n shown in the above formula (1), and the size of n is not limited, but is generally an integer selected from 0 to 25. Further, in the present invention, the bisphenol F type epoxy resin includes a modified epoxy resin of a bisphenol F type epoxy resin in addition to the structure of the formula (1), and has a molecular weight ranging from 200 to 10,000 g / mol, By weight based on the total weight of the skin coat epoxy composition for preventing water pollution.

When the amount is less than 35% by weight, the formation of the coating film is not smooth. If the amount is more than 69% by weight, the viscosity of the coating material may be high and the coating may not be performed smoothly.

It is preferable that the subject silane compound in the skin coat epoxy composition for preventing pollution in water of the concrete structure according to the present invention is added in an amount of 3 to 5 wt% based on the total weight.

When the amount of the silane compound is less than 3% by weight, the water repellency is lowered. If the amount of the silane compound is more than 5% by weight, the excess silane compound remains in the composition and is not mixed with other composition materials.

In the composition of the present invention, the silane compound imparts water repellency to the base surface of the composition of the present invention, and water tension can be increased to prevent water from penetrating into the inside of the base paper by application of the composition. It is possible to maximize the effect of waterproofing.

In addition, since the silane compound is present on the base surface and penetrates deeply into the pores or pores as described above to impart water repellency to the inner wall surface of the pores and the surface of the bridge slab, the penetration of isobutylsilane or isooctylsilane Or at least one selected from the group consisting of isobutyltriethoxysilane, isooctyltriethoxysilane, isobutyltrimethoxysilane, and isooctyltrimethoxysilane, which is selected from the group consisting of methoxysilane and ethoxysilane, More than one is preferred.

The epoxy-glycidyl ether as a main component of the skin-coat epoxy composition for preventing water pollution of the concrete structure according to the present invention is added in an amount of 1 to 25% by weight, and as a diluent, induces resinization of the composition, If less than 1% by weight is added, the resin composition of the composition is not sufficiently formed, and it is difficult to form a waterproof layer. In addition, since the viscosity of the composition is high, the waterproof workability is markedly deteriorated. There is a problem that the physical properties of the waterproof layer are rapidly deteriorated, and the epoxy glycidyl ether not only improves workability and stability but also improves adhesion and overall durability.

In the skin-coat epoxy composition for preventing water pollution of the concrete structure according to the present invention, 26 to 36% by weight of calcite is added as a main ingredient. The calcite is a known material used as a filler in the production of a coating film waterproofing material. And has a property of increasing the heat resistance, abrasion resistance, chemical resistance, and hardness of the coating film, as well as buffering the acidic environment.

If the content of the calcite powder is less than about 36 wt%, the strength of the coating film is lowered, the life thereof is shortened, and there is a problem that the oil can not be absorbed sufficiently. When the content is more than 36 wt%, hardness is excessively increased, There is a problem that the durability is deteriorated.

The subject quaternary ammonium compound in the skin coat epoxy composition for preventing water pollution of the concrete structure according to the present invention is added in an amount of 0.5 to 1.5% by weight.

The quaternary ammonium compound is preferably such that the compound constituting the skin-coat epoxy according to the present invention comprises 0.5 to 1.5 wt% of the quaternary ammonium compound of the amine functional monomer depending on the equivalence of the hydroxy group to be epoxidized, Lt; / RTI >

Silicon oxide is excellent in chemical stability and corrosion resistance at high temperatures and has high hardness. This ultra fine particle powder floats on the surface of the coating film during drying to form a dense and hard coating film, thereby preventing permeation of water vapor and other gases and liquids, as well as preventing moisture permeation, durability, weather resistance, impact resistance and chemical resistance The coating surface is excellent and reflects light to protect the coating from ultraviolet rays. In addition, due to its excellent thermal stability, it prevents shrinkage and expansion of concrete by preventing the temperature rise of the adherend, and prevents the resin from being neutralized / chlorinated, thereby maintaining the durability of the film for a long time.

Therefore, by setting the content of the amorphous silicon oxide as 0.1 to 0.3% by weight in the skin-coat epoxy composition for preventing pollution in water of the concrete structure according to the present invention, it is possible to prevent the ultraviolet ray shielding effect as well as the hardness from rising excessively while improving the durability .

The phenol as the main agent among the skin-coat epoxy compositions for preventing pollution in water of the concrete structure according to the present invention is an accelerator. When added in an amount of less than 0.1% by weight, the effect is hard to be obtained. When added in an amount exceeding 5% by weight, By weight and 0.1 to 5% by weight.

In the skin coat epoxy composition for prevention of underwater pollution of the concrete structure according to the present invention, the emulsifying agent of the present invention lowers the interfacial tension, imparts mechanical protection to the particle surface by the adsorbed film, and imparts repulsive force to the particles by ionization , And HLB (Hydrophilic Liphophilic Balance).

The HLB value ranges from 0 to 20, and the action differs depending on each range. For example, from 0 to 4, the vapors work. In the range of about 3 to 7, 7 to 20 emulsify in oil in water, and emulsify in the range of about 10 to 20, and can be used in various combinations of emulsifiers having different HLB values.

The present invention adopts an emulsifier having an HLB value of 3 to 7 as an emulsifier in order to improve the physical properties of the product and improve the thermal stability and storage stability, such as improving the initial adhesive force, cohesive force and adhesive workability of the aqueous adhesive agent composition desirable.

When the amount of the emulsifier is within the range of 0.05 to 20% by weight, the viscosity can be controlled within a range suitable for the aqueous tackifier composition, and an excellent storage stability effect can be obtained

The composition of the curing agent in the skin coat epoxy composition for preventing water pollution of the concrete structure according to the present invention may be any known one, but the constitution of the curing agent in the following composition makes the skin coat epoxy property as it is, .

The polyamide of the hardening agent in the skin coat epoxy composition for preventing water pollution of the concrete structure according to the present invention preferably has a weight average molecular weight of 1,000 to 5,000, more preferably 1,000 to 4,000. If the weight average molecular weight of the polyamide is less than the above range, a desired viscosity can not be obtained and it is difficult to ensure the immobility. If the weight average molecular weight is larger than the above range, it is not easy to control the viscosity. In the present invention, the polyamide may be used as long as it has the weight average molecular weight regardless of the type thereof.

If the amount of the polyamide is less than 25% by weight based on the total weight of the curing agent in the skin coat epoxy composition for preventing pollution of the concrete structure in water, a desired viscosity can not be obtained. If the amount exceeds 50% by weight, .

It is preferable that 10 to 30% by weight of the reaction product of tall oil and fatty acid of the curing agent in the skin coat epoxy composition for preventing pollution of the concrete structure according to the present invention, and 10 to 30% by weight of polyoxypropylene diamine and triethylene tetramine are contained.

The phenol as a hardener in the skin coat epoxy composition for preventing pollution in water of a concrete structure according to the present invention is an accelerator. When added in an amount of less than 1% by weight, the effect is hardly observed. When added in an amount exceeding 10% by weight, By weight, and 1 to 10% by weight.

In the skin coat epoxy composition for prevention of underwater pollution of the concrete structure according to the present invention, the emulsifying agent of the present invention lowers the interfacial tension, imparts mechanical protection to the particle surface by the adsorbed film, and imparts repulsive force to the particles by ionization , And when it is within 5 wt% to 20 wt% based on the total weight of the curing agent, the viscosity can be controlled within a range suitable for the aqueous tackifier composition, and an excellent storage stability effect can be obtained.

On the other hand, as a result of blending with various combinations of the subject matter and the curing agent of the present invention, it was found that the workability is most excellent when the proportion of the subject: curing agent is 5: 1.

The subject to be used in the present invention is cured by the curing agent component to increase cross-linking, and has an excellent curing property by bringing about the activation of the gravitational force by the gradual rate control in the curing reaction.

In addition, since a desired amount of water can be freely added later, workability is excellent, and workability is also excellent since there is no release of harmful substances.

Further, the bisphenol F type epoxy resin is adhered to the inner side by the action of a flocculant and is not exposed to the surface during the curing process, and the bisphenol F type epoxy resin portion is strongly fixed on the surface of the building.

Accordingly, peeling and cracking of the coating layer can be prevented, moisture resistance and weather resistance are improved, surface deterioration is prevented, and durability is improved.

Meanwhile, in the first coating step of forming the skin coat epoxy primary coating film 10 as described above, the epoxy mixture is applied to a thickness of 120 탆 to 150 탆 relatively thinner than the second and third coating steps to be described later, give.

Then, a secondary drying step of drying the skin coat epoxy primary coating film 10 at a temperature of 5 ° C to 36 ° C for 8 to 10 hours after the primary coating step is performed, and after the secondary drying step, methyl isobutyl A mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone was mixed with a skin coat epoxy composed mainly of epoxy, and 7 to 8 wt% of the mixture was mixed with a skin coat epoxy 92 to 93% by weight, and then applied on top of the skin coat epoxy primary coating film 10 to form a second skin coat epoxy coating film 12.

The skin coat epoxy secondary coating film 12 formed on the top of the skin coat epoxy primary coating film 10 is formed to have a thickness of 100 to 120 탆 which is relatively thicker than the thickness of the skin coat epoxy primary coating film 10 And the skin coat epoxy secondary coating film 12 is formed by coating the surface of the skin coat epoxy primary coating film 10 so that the surface can be formed more smoothly by grasping the roughness not caught by the skin coat epoxy primary coating film 10 once more.

After the second coating step, the skin coat epoxy secondary coating film 12 is dried at a temperature of 5 to 36 ° C for 8 to 12 hours, followed by a tertiary drying step. Thereafter, methyl isobutyl ketone, And methyl ethyl ketone (Methyl Ethyl Ketone) were mixed in a skin coat epoxy composed mainly of epoxy, and the mixture was mixed with 4 to 5 wt% of a skin coat epoxy and 95 to 96 wt% of a skin coat epoxy And then applied onto the skin coat epoxy secondary coating film 12 to form a skin coat epoxy tertiary coating film 14.

The thickness of the skin coat epoxy third coating film 14 is relatively thicker than the thickness of the skin coat epoxy secondary coating film 12 in the process of forming the skin coat epoxy third coating film 14, So that the surface of the skin coat epoxy tertiary coating film 14 is formed into a smooth shape, thereby raising the roughness.

Here, in the primary, secondary and tertiary application steps, the mixing ratios of the skin coat epoxy forming the skin coat epoxy primary, secondary, and tertiary coating films 10, 12, and 14 and the mixture are different from each other , Since the viscosity of the skin-coat epoxy mixture applied in the secondary is higher than that of the skin-coat epoxy mixture applied in the primary, the internal resistance to the flow is higher and the secondary coating is applied in the tertiary Since the skin coat epoxy mixture has a high viscosity, the internal resistance to flow is higher, so that the surface of the coating film is smoothened more smoothly when the skin coat epoxy primary, secondary, and tertiary coating films 10, 12, It will be possible to do.

As described above, the dual waterproofing method using the skin coat and skin coat epoxy for preventing water pollution of the concrete structure according to the present invention is excellent in adhesion to the adhered surface 2 and has excellent durability, weather resistance and water resistance In addition, the uniformity of coating film formation and the prevention of surface cracking are also excellent. In particular, water repellency and system performance are remarkably improved by using a skin coat and a skin coat epoxy.

2: deposition surface 4: first primer layer
6: Skin coat layer 8: Second primer layer
10: Skin coat epoxy primary coating
12: Skin coat epoxy secondary coating
14: Skin coat epoxy third coating film

Claims (3)

A vinyl acetate ethylene copolymer (Vinyl Acetate Ethylene Polymer); 20 to 25% 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 ), calcium hydroxide ) 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, And 0.5 to 2% by weight of zinc oxide. The skin coat for preventing contamination of water in a concrete structure,
Wherein the water-soluble polymer is mixed with the vinyl acetate ethylene copolymer: water: inorganic powder in a weight ratio of 1: 1: 5. When the adhered surface 2 of the concrete structure is assembled, a skin coat primer prepared by mixing a 2: 1 mixture of vinyl acetate ethylene copolymer and water in the surface-treated adhered surface 2 is coated to form a first primer layer 4 ; ≪ / RTI >
When the first primer layer 4 is dried, the skin coat according to claim 1 is applied to the first primer layer 4 at a coating rate of 1.5 to 2 kg / m 2 to form a thin film skin coat layer having a thickness of 1000 to 1300 μm 6) < / RTI >
A first 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 layer 6;
Forming a second primer layer (8) by applying a water-soluble skin coat epoxy primer to the skin coat layer (6) when the skin coat layer (6) is dried;
When the second primer layer 8 is dried, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with epoxy-based skin coat epoxy The mixture is mixed with 10 to 12% by weight of the mixture: 88 to 90% by weight of skin coat epoxy and then applied to the second primer layer 8 to prepare a skin coat epoxy primary coating film 10 having a thickness of 120 to 150 탆, A first coating step of forming a coating layer;
The skin-
Wherein the epoxy resin composition comprises 35 to 69 wt% of bisphenol F type epoxy resin, 3 to 5 wt% of silane compound, 1 to 25 wt% of epoxy glycidyl ether, 26 to 36 wt% of calcite, 0.5 to 1.5 wt% of quaternary ammonium compound, 0.1 to 0.3% by weight of silicon, 0.1 to 5% by weight of phenol, and 0.05 to 20% by weight of an emulsifier; , 10 to 30% by weight of a reaction product of tall oil and fatty acid, 10 to 30% by weight of polyoxypropylene diamine and triethylenetetramine, 5 to 20% by weight of an emulsifier, 1 to 30% by weight of phenol 1 To 10% by weight of a curing agent, wherein the curing agent and the curing agent are mixed in a weight ratio of 5: 1 before forming the waterproof coating film;
A secondary drying step of drying the skin coat epoxy primary coating film 10 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 a skin coat epoxy composed mainly of epoxy, 7 to 8% by weight: skin coat epoxy mixed with 92 to 93% by weight, and then coated on top of the skin coat epoxy primary coating film 10 to form a skin coat epoxy secondary coating film 12 having a thickness of 100 to 120 탆 A second coating step of coating a second coating layer;
A third drying step of drying the skin coat epoxy secondary coating film 12 at a temperature of from 5 ° C to 36 ° C for 8 to 12 hours after the secondary coating step;
After the tertiary drying step, a mixture of one or two of methyl isobutyl ketone and methyl ethyl ketone is mixed with a skin coat epoxy composed mainly of epoxy, 4 to 5% by weight: Skin coat epoxy is mixed with 95 to 96% by weight and then coated on top of the skin coat epoxy secondary coating 12 to form a skin coat epoxy tertiary coating film 14 having a thickness of 100 to 120 탆 And a second waterproofing method using a skin coat and skin coat epoxy for preventing water pollution of a concrete structure. delete

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