KR100661494B1 - Polymer coating composition for protecting neutralization and salt damage of concrete structures - Google Patents

Abstract

Provided is a polymer paint composition which is prevented in the neutralization and salt damage of a concrete structure, is excellent in the adhesive strength with a concrete structure and is free from an organic solvent or a thinner. The polymer paint composition comprises a base which comprises 35-68 wt% of a bisphenol A type epoxy resin, 5-10 wt% of a reactive diluent selected from butyl glycidyl ether, phenyl glycidyl ether and a C12-C14 aliphatic glycidyl ether, 3-15 wt% of a dimer acid modified epoxy resin, 5-30 wt% of silicon carbide, 5-30 wt% of alumina, 3-20 wt% of silica, 1-10 wt% of zinc, 1-10 wt% of titanium dioxide, 3-30 wt% of calcium carbonate, 5-20 wt% of an inorganic pigment comprising CoO and Co3O4, 0.1-2 wt% of Aerosil, 0.1-2 wt% of Tixogel, 0.1-1.0 wt% of a silane coupling agent selected from 3-glycidoxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane and 3-mercaptopropyltrimethoxysilane, 0.1-1 wt% of an antifoaming agent and 0.1-1 wt% of a dispersant; and a curing agent which comprises 60-95 wt% of a cyclic aliphatic polyamine or polyamide resin, 1-20 wt% of silica, 1-20 wt% of CaCO3, 0.1-2 wt% of Tixogel and 0.1-2 wt% of Aerosil. The ratio of the base and the curing agent is 1-5 : 1 by weight.

Description

Polymer coating composition for neutralizing concrete structures and preventing salts {POLYMER COATING COMPOSITION FOR PROTECTING NEUTRALIZATION AND SALT DAMAGE OF CONCRETE STRUCTURES}

The present invention is to prepare a polymer coating composition composed of ceramics and metal microparticles with excellent wear resistance and corrosion resistance in order to prevent salt and neutralization of marine concrete structures, roads coated with calcium chloride. The present invention protects the surface of the concrete structure by applying the polymer coating composition developed on the concrete surface and blocks the chloride, carbon dioxide, moisture, etc. which are external factors of the concrete deterioration to protect the concrete structure from salt and neutralization to maintain the aesthetics of the structure And to improve durability.

The present invention is chemically eroded by concrete structures, port structures, underground structures, exposed structures, structures that have been neutralized for a long life, bridge structures frequently subjected to wet and dry repetition, calcium chloride and SO _x , NO _x, etc. in various marine environments. The present invention relates to a coating polymer composition for preventing salting and neutralization of concrete structures in the air and underwater, such as the generated structure, and more particularly, has excellent resistance to salting and neutralization, and to control curing time in air or in water. It relates to a polymer coating composition capable of excellent adhesion to the concrete structure.

Concrete structures initially form strong alkaline calcium hydroxides with a pH of 12 to 13 when cement, the main material, is mixed with water, so that the reinforcing bars in the concrete are surrounded by alkaline coatings to prevent rust. If there is no coating on the surface of the concrete structure, harmful compounds such as chloride are easily attached to the porous concrete surface, and they are more easily penetrated because they are easily dropped by rain or wind.

In addition, chloride in the concrete defects, including construction joints and joints, which are fragile areas where the concrete composition is unevenly distributed in the concrete structure, rapidly penetrates and causes corrosion of concrete and steel (rebar) as the accumulation increases. Moreover, it is known that a large amount of chloride attached to the concrete surface moves inside even without various defects in the concrete.

In addition, neutralization progresses slowly due to carbonation reaction between carbon dioxide and concrete, an environmental condition through which harmful compounds can penetrate, external acid rain, polluted atmosphere, CO ₂ , SO ₂ , and salts, resulting in deterioration of concrete structures. This shortens the life of the concrete structure. Therefore, the concrete structure is an effective method to prevent the corrosion of the concrete and reinforcing the formation of the harmful compound shielding layer at the beginning, the polymer coating composition of the present invention can be used for that purpose can obtain excellent anticorrosive effect with a thin coating film.

Paints used in concrete should have impregnation, waterproof and alkali resistance suitable for the characteristics of concrete, and should have good performance as coatings such as adhesion, abrasion resistance and weather resistance. In addition to chemical resistance, paints applied to concrete surfaces require watertightness, abrasion resistance, and high hardness coating properties, because in this case, various harmful compounds such as chloride are difficult to adhere to the coating surface and are easily washed off by rainwater. Chloride ion permeability of coatings with these conditions is so small that there is little internal penetration of chloride ions.

Conventional salt prevention materials for general concrete structures (bridges, bridges, tunnels, offshore structures, water purification plants, sewage facilities, etc.) are applied in various ways such as ceramics, metals, and epoxys. Neutralization, deterioration, salting, freeze-thawing, etc.) and many problems are not possible in the wet and underwater conditions.

In general, domestic and foreign concrete structures used for neutral flame prevention paints mainly consist of metal powder and adhesives and ceramic anticorrosive paints.

As a prior art, Korean Patent No. 10-0484565 relates to a non-toxic, ceramic anticorrosive coating agent that can be used for concrete structures such as waterworks and swimming pools, and is manufactured using FDA-approved epoxy resins, bio-ceramic fillers, and antibacterial ceratoses. One concrete anticorrosive coating is proposed. This technology adopts a ceramic coating system that suppresses the growth of fungi in the water by anti-infrared radiation, which is harmless to humans and is effective for water conservation and hygiene safety measures. On the other hand, the construction cost of using special raw materials such as functional epoxy resin and antibacterial cerato is expensive and it is not suitable for application to general structures damaged by salt due to problems such as workability. In addition, the existing epoxy paints are yellowed when exposed to sunlight, deteriorating the polymer chain of the three-dimensional network structure has a fatal defect in the strength and weather resistance of the coating film.

In addition, Korean Patent No. 10-0279244 proposes a waterproof and anticorrosive method of a concrete structure by mixing aluminum powder with a polyurethane resin or an epoxy resin as a solvent and applying it to a concrete surface. The coating agent used herein is characterized in that the aluminum powder is oxidized to form an oxide film having a waterproofing function, thereby reflecting and blocking ultraviolet rays, having excellent workability and durability, and having a high price.

In order to overcome the problems of the prior art, the present invention has excellent chemical resistance and has a dense structure, which can fundamentally block the penetration of chloride ions, SO _x , NO _x , sulfates contained in the atmosphere, and can be applied in an environmentally friendly salt solution. And to provide a polymer coating composition for preventing neutralization.

The polymer coating composition of the present invention is applied to the concrete surface in order to prevent the corrosion of the concrete, the ceramic components such as silicon carbide, alumina, silica, etc. on the surface of the concrete structure to form three coating layers, metal (zinc) component It is a polymer coating composition that fundamentally blocks chloride and chemical components penetrating from the outside by forming a total of five dense coating layers, such as a film of a film and a film of a polymer component, and has excellent physical properties compared to other materials.

As another advantage of the present invention, silicon carbide, alumina, and silica powders have heat resistance close to 2000 ° C. and have near-perfect chemical resistance, which can not penetrate the compound at all even when left in strong acid and strong alkali.

The polymer coating composition of the present invention is a composite of alumina, silicon carbide, zinc powder, epoxy and cyclic aliphatic polyamine, which is excellent in UV protection, pollutant purification, harmful chemicals including neutralization, and heat resistance. Wetness, durability, weather resistance, impact resistance, and chemical resistance are superior to other paints to form a coating that completely protects the concrete, and maintains the durability of the coating for a long time in any harsh natural or artificial conditions.

In the present invention, by using a pigment composed of pure ceramic components and titanium oxide in the top coat, the reflection of ultraviolet rays in contact with the polymer resin, thereby preventing discoloration and deterioration of the coating film due to photolysis of the polymer resin, a problem of conventional paints .

Salt and neutralization of the polymer coating composition of the present invention is composed of three components, primer, medium, and top coat. The primer composition used zinc powder, silicon carbide and alumina fine particles as fillers to form an oxide film of zinc and an impermeable solid ceramic film.

The intermediate composition was manufactured to form a watertight coating layer made of ceramic components such as silicon carbide, alumina, and silica, and to ensure heat resistance and chemical resistance even under extreme conditions.

The top composition used ceramic pigments and titanium oxide to permanently maintain the beautiful appearance and reflect ultraviolet rays.

Preferably, the present invention (a) bisphenol A epoxy resin 35 ~ 68% by weight, reactive diluent (epoxy equivalent 135 ~ 330 g / eq) 5 ~ 10% by weight, dimer acid (modified acid modified epoxy resin 3) ~ 15 wt%, silicon carbide (SiC) powder 5-30 wt%, alumina (Al ₂ O ₃ ) 5-30 wt%, silica 3-20 wt%, zinc 1-10 wt%, titanium oxide 1-10 wt% %, Calcium carbonate 3-30%, inorganic pigments (CoO + Co ₃ O ₄ ) 5-20% by weight, aerosil 0.1-2% by weight, Tixogel 0.1-2% by weight, silane coupling A main material including 0.1 to 1.0% by weight of a ring agent, 0.1 to 1% by weight of an antifoaming agent, and 0.1 to 1% by weight of a dispersant; And (b) 60 to 95% by weight of cycloaliphatic polyamine, 1 to 20% by weight of silica (SiO ₂ ), 1 to 20% by weight of CaCO ₃ , 0.1 to 2% by weight of thixogel, and 0.1 to 2% by weight of aerosil. It provides a polymer coating composition for preventing concrete neutral salt comprising a cured material containing a (a): (b) in a ratio of 1 to 5: 1 by weight.

Silicon carbide used as a main component in the polymer coating composition of the present invention uses a fine powder having an average particle diameter of 5 ~ 50μm, is not produced as a natural mineral manufactured by artificial synthesis method, and has excellent chemical stability and corrosion resistance at high temperature and high Have hardness. Since silicon carbide and alumina ultrafine particles float on the surface of the coating film during drying to form a dense and high hardness coating, it prevents the permeation of water vapor, other gases and liquids, as well as moisture resistance, durability, weather resistance, impact resistance, It has excellent chemical resistance and the painted surface reflects light to protect the coating from UV rays. In addition, due to the excellent thermal stability of silicon carbide and alumina to prevent the temperature rise of the adherend to reduce the shrinkage, expansion of the concrete and to prevent the neutral flame of the resin to maintain the durability of the coating for a long time. The polymer coating composition of the present invention contains such silicon carbide (SiC) powder in an amount of 5 to 30% by weight based on the total weight of the main material. If the silicon carbide is 5% or less, it may not exhibit chemical resistance and properties, and if it is blended 30% or more, workability may decrease due to an increase in viscosity, and the hardness of the coating may be excessively increased to cause brittle fracture.

The sinterable alumina fine powder used as one of the main components of the present invention uses 5-50 μm, and has high hardness and excellent strength and corrosion resistance. The polymer coating composition of the present invention contains such sinterable alumina in an amount of 5 to 30% by weight based on the total weight of the main material. When the sinterable alumina is 5% or less, it does not exhibit functions such as UV reflection corrosion prevention, and when blended more than 30%, workability is deteriorated due to an increase in viscosity and specific gravity.

The primer and the middle coat composition of the present invention are characterized by employing a two-component curing system composed of a main material and a curing material, respectively.

The polymer resin used in the present invention includes an epoxy resin, a polyamine resin, and a silane compound used as a coupling agent.

Bisphenol-A epoxy resin is used as the main component of epoxy equivalent 180 ~ 220 g / eq (Kukdo Chemical, YD-128). In addition, bisphenol A type epoxy resins having a viscosity of 500 to 20,000 cps having an epoxy equivalent of 170 to 335 g / eq for the viscosity control of the polymer coating composition of the present invention may be used. The polymer coating composition of the present invention contains such bisphenol-A epoxy resin in an amount of 35 to 68% by weight based on the total weight of the main material. Containing 35 to 68% by weight of bisphenol A type epoxy resin is the most suitable ratio for mixing components consisting of polymer resin, ceramic powder and various additives. In case of less than 35% by weight, the absolute amount of resin is insufficient, which is a matrix material. If it contains more than 68% by weight, for example, 70% by weight of excess bisphenol-A epoxy remaining in the system, the physical properties of the composition is lowered and eluted to affect the environment Can give

When the structure shrinks / expands according to climate change, chemical change, etc. by adding a dimer acid-modified epoxy resin (epoxy equivalent 390-470 g / eq, Kukdo Chemical, YD-171) in the main composition of the present invention. Epoxy resin system with excellent impact resistance and plasticity is adopted to achieve a sense of unity with the structure. In addition, by imparting such excellent plasticity, the primer or paint penetrates the damaged surface of the concrete to impart a function of preventing cracking of the concrete which may occur due to volume expansion caused by heat generated when the curing reaction occurs. The polymer coating composition of the present invention contains such a dimer acid-modified epoxy resin in an amount of 3 to 15% by weight based on the total weight of the main material. When the dimer acid modified epoxy resin is used in 3 wt% or less, the plasticity decreases and thus the crack tracking performance cannot be exerted, and when the dimer acid is used in 15 wt% or more, the viscosity of the main composition decreases and the curing time is too long or the hardener is used. It hardens even if I put it.

BGE (butyl glycidyl ether), PGE (phenyl glycidyl ether), aliphatic glycidyl ether (C ₁₂ -C) having an epoxy equivalent of 135 to 330 g / eq in order to control the viscosity control and reactivity of the main ingredient ₁₄ ) using a reactive epoxy diluent. The polymer coating composition of the present invention contains such a reactive diluent in an amount of 5 to 10% by weight based on the total weight of the main material. If the content is less than 3% by weight, the dilution effect is lowered, so that the stirring of the composition is impossible. When the content is more than 15% by weight, the viscosity of the main composition is excessively reduced and serves to hinder the reaction between the main material and the cured material.

The curable material contained in the polymer coating composition of the present invention uses a cycloaliphatic polyamine compound (KH-816, Kukdo Chemical) resistant to ultraviolet rays when used in concrete structures exposed to the atmosphere, and an active hydrogen equivalent weight when used in an adherend in water. This highly reactive polyamide resin (amine value 320-360 mgKOH / g; H-21, Kukdo Chemical) is used. In addition, a low temperature curable paint for winter may be added to the polymer captan and penalkamine (phenalkamine). The polymer coating composition of the present invention contains such a polyamine compound in an amount of 60 to 95% by weight based on the total weight of the curing material. If the amount is less than 60% by weight, for example, 30% by weight or less, the absolute number of amine groups to react with the epoxy group is insufficient, so that the performance as a paint cannot be exhibited. Excess amine compound which is reacted or unreacted remains in the composition, resulting in deterioration of physical properties.

In addition, in the present invention, the coupling agent used for improving adhesion between the paint and the adherend is an epoxy silane compound (3-glycidoxypropyltrimethoxysilane) having a molecular weight of about 220 to 250. In addition, amino silane (3-aminopropyltriethoxysilane), acrylic silane (3-methacryloxypropyltrimethoxysilane), mercapto silane (3-mercaptopropyl trimethoxysilane), and the like can also be used. . The polymer coating composition of the present invention contains such a silane compound in an amount of 0.1 to 1.0% by weight based on the total weight of the main material. The silane compound is the most suitable ratio commonly used in the industry to increase adhesion between dissimilar materials having different properties, and when contained in an amount of 0.1% by weight or less or 1.0% by weight or more, the effect of improving adhesion can not be expected. .

The main material may further include 5 to 200% by weight of at least one selected from silicon carbide, zinc, titanium oxide, silica, alumina, calcium carbonate, thixotropic agents (Tixogel, Aerosil), and inorganic pigments based on 100% by weight of the main material. . This is to produce a polymer coating composition close to a paste state to impart a cross-sectional repair function of a severely damaged concrete structure.

The thixotropic agent used in the present invention to impart the flow prevention and thixotropy of the composition (Tixogel) as the main component of amorphous fumed silica (Amourphous fumed silica) and titanium oxide fine particles having a particle diameter of 15 ~ 50μm -250 and Aerosil # 300 are used. The cured material constituting the polymer coating composition of the present invention uses 1 to 20% by weight of silica, 0.1 to 2% by weight of thixogel, and 0.1 to 2 aerosils based on the total weight of the cured material. Used in amounts of weight percent. The silica content is controlled in the range of 1 to 20% by weight to express the strength, hardness, and surface roughness of the coating film, the effect can not be expected below 1% by weight, the coating film is not formed at 20% by weight or more in the form of a paste do. In addition, thixogel and aerosil can improve the flowability and rheological properties of the coating film within 0.1 to 2% by weight, respectively, and when used more than 2% by weight, adversely affect the surface roughness and workability of the coating film. In addition, the brand name Tixogel VP, Chixogel MP, Pangel B-40 by EFKA, etc. can be used.

The cured material used in the present invention may further comprise 1 to 200% by weight of one or more selected from silica, calcium carbonate, thixotropic agents (Tixogel, Aerosil), inorganic pigments with respect to 100% by weight of the curing material. This is to produce a polymer coating composition close to a paste state to impart a cross-sectional repair function of a severely damaged concrete structure.

As the antifoaming agent used for imparting the anti-foaming function of the composition in the present invention, BYK-A501 manufactured by BYK-Chemie, the main component of which is a bubble breaking polymer and a polysiloxane solution. Moreover, EFKA8203 by EFKA, Perenol E8 by Impag, etc. can be used. In the present invention, such an antifoaming agent is used in an amount of 0.1 to 1% by weight based on the total weight of the main material. The antifoaming agent does not exhibit a defoaming function at 0.1 wt% or less, and deteriorates or blushes the coating film at 1 wt% or more.

As a dispersant used to impart dispersibility of the composition in the present invention, BYK- # 161 manufactured by BYK-Chemie, whose main component is a high molecular weight block copolymer solution having a pigment affinity group, is used. In addition, 1-methoxy-2-propylacetate may be used, and EFKA 4048, 4060, etc. of EFKA Corporation may also be used. In the present invention, such a dispersant is used in an amount of 0.1 to 1% by weight. The dispersant may not exhibit the function of dispersing the pigment in the polymer resin at 0.1 wt% or less, and at 1 wt% or more, deterioration and blushing of the coating film occur.

As the ceramic fine particles used in the present invention, at least one ceramic powder selected from silicon carbide, alumina, zinc oxide, titanium oxide, silica, and calcium carbonate having a particle size distribution of 5 to 50 μm may be used. In the present invention, zinc oxide is used in an amount of 1 to 10% by weight based on the total weight of the main material, titanium oxide is used in an amount of 1 to 10% by weight 5, and calcium carbonate is used in an amount of 3 to 30% by weight. . If the content of zinc oxide and titanium oxide is less than 1% by weight, anti-ultraviolet and reflective effects cannot be expected, and if it is more than 10% by weight, the coating film excessively reflects light and cannot be used for structures requiring safety. .

In addition, the main material constituting the polymer coating composition of the present invention contains silica in an amount of 3 to 20% by weight based on the total weight of the main material, aerosil in an amount of 0.1 to 2% by weight, and thixogel 0.1 It is contained in an amount of ˜2% by weight.

The inorganic pigment used in the present invention uses a blue (P-500, Hanil) or green pigment (P-600, Hanil) in which CoO and Co ₃ O _{4, which} are complex oxides of cobalt metal, are mixed in a constant ratio. In addition, to produce various colors, a metal oxide such as copper, iron, chromium, or manganese, or a ceramic pigment composed of a complex oxide of such a metal may be used. In the present invention, the inorganic pigment is used in an amount of 5 to 20% by weight based on the entire main material. If the inorganic pigment is used in less than 5% by weight does not express a vivid color, when used by more than 20% by weight it takes a long time to cure the coating film, the surface roughness of the coating film may have a bad effect on the physical properties.

The present invention also provides (a) 35 to 68% by weight of bisphenol A epoxy resin, 5 to 10% by weight of reactive diluent (epoxy equivalent 135 to 330 g / eq), 5 to 30% by weight of silicon carbide (SiC) powder, alumina ( Al ₂ O ₃ ) 5-30% by weight, zinc 1-10% by weight, titanium oxide 1-10% by weight, inorganic pigments (CoO + Co ₃ O ₄ ) 5-20% by weight, aerosil 0.1-2 Weight%, 0.1-2 wt% of Tixogel, 0.1-1 wt% of antifoaming agent, 0.1-1 wt% of dispersant; And (b) 60 to 95% by weight of cycloaliphatic polyamine or polyamide resin, 1 to 20% by weight of silica (SiO ₂ ), 1 to 20% by weight of CaCO ₃ , 0.1 to 2% by weight of thixogel, aerosil 0.1 It provides a polymer coating composition for preventing concrete neutral flame salt (a): (b) is contained in a ratio of 1 to 5: 1 by weight of the cured material containing ~ 2% by weight.

The present invention also provides (a) 35 to 68% by weight of bisphenol A epoxy resin, 5 to 10% by weight of reactive diluent (epoxy equivalent 135 to 330 g / eq), 3 to 15 weight of dimer acid modified epoxy resin. %, Silicon carbide (SiC) powder 5-30% by weight, alumina (Al ₂ O ₃ ) 5-30% by weight, metal zinc powder 3-20% by weight, calcium carbonate 3-30% by weight, aerosil 0.1 ˜2 wt%, 0.1-2 wt% of Tixogel, 0.1-1.0 wt% of silane coupling agent; And (b) 60 to 95% by weight of cycloaliphatic polyamine or polyamide resin, 1 to 20% by weight of silica (SiO ₂ ), 1 to 20% by weight of CaCO ₃ , and 0.1 to 2% by weight of thixogel. Contrast (a): Provides a polymer coating composition for preventing neutral neutral salt containing (b) in a ratio of 1 to 5: 1.

When the polymer coating composition for preventing concrete neutral salt of the present invention starts to cure within 1 hour when the main material and the hardening material are mixed with each other in the air and in water, and generally hardens within 24 hours, the main material and the hardening material are mixed. It is prepared in the form of a liquid composition.

First, the main material is a mixture of epoxy resin, reactive epoxy resin and a small amount of dispersant first at low speed, and then the ceramic inorganic pigment is added to sufficiently disperse at high speed. Next, the coupling agent and the thixotropic agent are mixed at a high speed while a small amount is mixed, and ceramic powders such as silicon carbide powder, alumina powder, silica, titanium oxide, calcium carbonate and the like are mixed at a high speed of 4000 rpm or more for 30 minutes or more. Finally, a small amount of antifoaming agent is added to the resulting mixture to stir at low speed to remove air bubbles in the polymer coating composition, and then depressurized in a reduced pressure vessel to completely defoaming to complete the main ingredient.

The cured material is prepared by adding a flow inhibitor (a thixotropic agent) and ceramic powder to a curing catalyst such as a cycloaliphatic polyamine curing agent or a polymercaptan curing agent having different physical properties, depending on the purpose of the product.

The manufacturing method is for the production method of the intermediate coating material and is prepared by the same method as described above of the primer and top coating. Hereinafter, the structure of the present invention will be described in detail with reference to Examples. However, the examples are illustrative only and the scope of the invention is not limited to the following examples.

Example  1, 2, 3 concrete Neutral flame  Polymer coating composition for prevention

Examples 1 to 3 were mixed according to the contents of Table 1 to prepare a composition.

Component (g) Example 1 Example 2 Top Coat Example 3 Primer        Main material  Bisphenol A type epoxy resin (epoxy equivalent 186g / eq; YD-128) 57 40 40  Dimer acid-modified epoxy resins (epoxy equivalents 390-470) g / eq; YD-171) 5 4  Reactive Diluent (Epoxy Equivalent 135 ~ 330g / eq; BGE) 11 6 5  Silicon Carbide (SiC) Powder 15 7 3 Isomerizable Alumina (Al ₂ O ₃ ) Powder 15 7 3 Silica (SiO ₂ ) Powder 10  Zn powder 5 One 2 TiO ₂ Powder 5 One CaCO ₃ 15 2 Inorganic Pigments (CoO + Co ₃ O ₄ Composite Oxide) 10 6.4  Aerosil # 300 0.5 0.5 0.3  Chic Sogel (MP-250) 0.5 0.5 0.3  Epoxy-based silane coupling agent 0.4 0.4  Antifoam (BYK-A501) 0.2 0.2  Dispersant (BYK- # 161) 0.4 0.4 Sum 150 70 60   Curing Material  Cycloaliphatic Polyamine (KH-816) 42 32 28.5 Silica (SiO ₂ ) Powder 3.5 One 0.5 Calcium Carbonate (CaCO ₃ ) 3.5 One 0.5  Chic Sogel (MP-250) 0.5 0.5 0.5  Aerosil # 300 0.5 0.5 Sum 50 35 30

Test Example 1: Measurement of Properties

Table 2 shows the results of mixing the main material and the hardening material of the repairing reinforcement made of the two-liquid composition prepared in Examples 1, 2, and 3 and spray-coating and curing the concrete specimens.

 Test Items  unit  Example 1  Example 2 Top Coat  Example 3 Primer  Test Methods  Compounding ratio (main material / hardening material) Weight ratio 3: 1 2: 1 2: 1  Housework time time One One One  Full hardening time time 2 2 2  Adhesion strength N / mm ² 2.87 2.78 2.85 KSF 4929-'02  The tensile strength N / mm ² 12.30 12.29 12.26  Salt Spray Test (120hr) hr clear clear clear  Impact resistance clear clear clear  Moisture resistance clear clear clear  Permeability clear clear clear  Oil resistance clear clear clear Acid Resistance (5% H ₂ SO ₄ 24hr) clear clear clear KS M ISO 2812-1-'03  Alkali Resistance (5% NaOH 24hr) clear clear clear KS M ISO 2812-1-'03  Hardness 92 92 90 KSMISO 868-01

Compared with the conventional coating material, the polymer coating composition of the present invention exhibiting excellent effects as described above is as follows.

At present, the concrete structure coating materials used at home and abroad are mainly composed of acrylic copolymers and metal mixtures.

Characteristics of Acrylic Copolymer Based Paint  Constructability   Work in 4 steps: surface treatment, cleaning of high pressure water, primer application, top coat.  Advantages  Excellent chemical resistance and flexibility against cracks.  Disadvantages Impossible to work underwater, it takes a long time to cure, the air is long, hard to give fast curing performance.  Economics  43,667 KRW / ㎡  Properties  It is good but depends on the type of polymer mixed.

Characteristic of metal mixture paint  Constructability   5 stage construction (Surface treatment-Pore putty-1st coating Permeable adhesive coating-2nd coating metal coating-3rd coating metal coating)  Advantages  Excellent chemical resistance and strong coating and aesthetics.  Disadvantages Lack of flexibility for cracking and color change by ultraviolet rays. Mainly used for metal structures such as bridges. It is more expensive than ordinary paint.

Characteristics of the polymer coating composition of the present invention  Constructability  Primer-medium-top three-stage construction   Advantages  The curing time is relatively fast and the curing time can be adjusted according to the type of curing agent. Excellent impact resistance and wear resistance  Properties  It is a composite composition of polymers, ceramics, and metals. It is particularly excellent in chemical resistance, adhesion, workability, maintenance and crack tracking.

As can be seen from Tables 3 to 5, the polymer coating composition of the present invention is remarkably excellent in various aspects as compared with the conventional coating material.

As described above, the present invention can control the pot life according to the site conditions, and can provide a polymer coating composition for neutralizing and preventing salts having excellent adhesion with existing concrete structures. The present invention can completely protect various concrete structures exposed to neutralization and salt damage in the air or in the water.

By applying the polymer coating composition of the present invention to the concrete structure, it is possible to prevent the deterioration of the concrete by the exhaust gas (sulphite gas, nitrous acid gas, etc.), to prevent the neutral flame of concrete exposed to salt salt and concrete in the droplets and It can prevent corrosion of internal reinforcing bars. In addition, neutralization of concrete by contact with calcium hydroxide and carbon dioxide gas can be completely prevented.

Claims (10)

(a) 35 to 68% by weight of bisphenol A epoxy resin; 5-10% by weight of a reactive diluent (epoxy equivalent 135-330 g / eq) selected from the group consisting of butyl glycidyl ether, phenyl glycidyl ether and aliphatic glycidyl ether (C ₁₂ -C ₁₄ ); 3 to 15% by weight of dimer acid-modified epoxy resin (epoxy equivalent 390-470 g / eq, Kukdo Chemical YD-171); 5-30% by weight of silicon carbide (SiC) powder; 5-30% by weight of alumina (Al ₂ O ₃ ); 3-20% by weight of silica; 1-10% by weight of zinc; Titanium oxide 1-10% by weight; Calcium carbonate 3-30% by weight; Inorganic pigments (CoO + Co ₃ O ₄ ) 5-20% by weight; Aerosil 0.1-2 wt%; 0.1 to 2% by weight of thixogel; Silane coupling agent 0.1 selected from the group consisting of 3-glycidoxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, and 3-mercaptopropyl trimethoxysilane -1.0 wt%; Antifoam 0.1-1% by weight; And 0.1-1% by weight of a dispersant; And (b) 60 to 95% by weight of cycloaliphatic polyamine or polyamide resin, 1 to 20% by weight of silica (SiO ₂ ), 1 to 20% by weight of CaCO ₃ , 0.1 to 2% by weight of thixogel, 0.1 to Aerosil A polymer coating composition for preventing concrete neutralization and salt, wherein the cured material including 2% by weight is contained in a ratio of 1 to 5: 1 by weight (a) :( b).  5 to 200% by weight of one or more selected from silicon carbide, zinc, titanium oxide, silica, alumina, calcium carbonate, thixotropic agents (Tixogel, Aerosil), inorganic pigments based on 100% by weight of the main material Concrete neutralization and salt prevention polymer coating composition, characterized in that the addition. The method of claim 1, wherein 1 to 200% by weight of silica, calcium carbonate, thixogel (Tixogel, Aerosil) and inorganic pigments are added to 100% by weight of the cured material. Salt coating polymer coating composition. (delete) (delete) The polymer coating composition for preventing concrete neutralization and salt according to claim 1, wherein the average particle diameter of silicon carbide is 5 to 50 µm. (delete) The polymer coating composition for preventing concrete neutralization and salt according to claim 1, wherein a polymer captan or penalkamin is further added to the cured material. (a) 35 to 68% by weight of bisphenol A epoxy resin; 5-10% by weight of a reactive diluent (epoxy equivalent 135-330 g / eq) selected from the group consisting of butyl glycidyl ether, phenyl glycidyl ether or aliphatic glycidyl ether (C ₁₂ -C ₁₄ ); 5-30% by weight of silicon carbide (SiC) powder; 5-30% by weight of alumina (Al ₂ O ₃ ); 1-10% by weight of zinc; Titanium oxide 1-10% by weight; Inorganic pigments (CoO + Co ₃ O ₄ ) 5-20% by weight; Aerosil 0.1-2 wt%; 0.1 to 2% by weight of thixogel; Antifoam 0.1-1% by weight; And 0.1-1% by weight of a dispersant; And (b) 60 to 95% by weight of cycloaliphatic polyamine or polyamide resin; 1-20% by weight of silica (SiO ₂ ); CaCO ₃ 1-20 wt%; 0.1-2% by weight of thixogel; And a cured material containing 0.1 to 2 wt% of aerosil (a) :( b) in a ratio of 1 to 5: 1, based on weight. (a) 35 to 68% by weight of bisphenol-A epoxy resin, butyl glycidyl ether, phenyl glycidyl ether or aliphatic glycidyl ether (C ₁₂ -C ₁₄ ) reactive dilution selected from the group consisting of (epoxy equivalent 135 ~ 330 g / eq) 5-10% by weight, dimer acid (modified epoxy resin) (Epoxy equivalent 390-470g / eq, Kukdo Chemical YD-171) 3-15% by weight; 5-30% by weight of silicon carbide (SiC) powder; 5-30% by weight of alumina (Al ₂ O ₃ ); Metal zinc powder 3-20% by weight; Calcium carbonate 3-30% by weight; Aerosil 0.1-2 wt%; 0.1 to 2% by weight of thixogel; And a silane coupling agent selected from the group consisting of 3-glycidoxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, and 3-mercaptopropyl trimethoxysilane. Main material containing 0.1 to 1.0% by weight; And (b) 60 to 95% by weight of cycloaliphatic polyamine or polyamide resin; 1-20% by weight of silica (SiO ₂ ); CaCO ₃ 1-20 wt%; And (a) :( b) 1 to 5: 1 by weight of the cured material containing 0.1-2% by weight of thixogel, and a polymer coating composition for preventing concrete neutralization and salt.