KR20080071079A - Coating composition for surface treatment of concrete structure - Google Patents

Abstract

A composition for coating the surface of a concrete structure is provided to improve waterproofness, oil resistance, adhesive strength, hardness, electric insulation, heat insulation and abrasion resistance. A composition for coating the surface of a concrete structure comprises 50 parts by weight of the coal tar which contains 30-50 wt% of pitch; 60 parts by weight of an epoxy resin; 10-15 parts by weight of a polyamine or polyamide curing agent; 6 parts by weight of a mica powder; 7 parts by weight of a dolomite powder; 8 parts by weight of a silica or silicate powder; and 30-40 parts by weight of any one active solvent selected from an ester, a ketone, toluene and an aromatic hydrocarbon.

Description

Concrete Structure Surface Treatment Coating Composition {COATING COMPOSITION FOR SURFACE TREATMENT OF CONCRETE STRUCTURE}

The present invention is not only to protect the surface of sewage pipes, manholes, sewage treatment tanks, water tanks, side waterway pipes, but also broadly storage tanks such as crude oil, petroleum, alkalis, aqueous solutions of various compounds, ship shells, decks, keys, fuel tank ballasts. And surface reinforcement coating compositions of pipes, tanks, sedimentation tank waste tanks, concrete, etc., offshore structures, and water installations of plant equipment. Specifically, epoxy resins, hardeners, coaltals, mica, roadmite, silica or silica sand powder, And it relates to a concrete structure surface treatment coating composition consisting of one solvent selected from esters, ketones, toluene aromatic hydro carbon.

Excellent water resistance of the coating composition It has good alkali resistance, aliphatic carbonated water and oil resistance, and has a thick film coating property and a very good balance of plasticity, hardness, and adhesion. Do.

In addition, it can be said to be a concrete coating surface coating composition having excellent insulation effect, heat resistance and flame resistance, and excellent waterproof and wear resistance.

Conventional methods for improving concrete properties include adding admixtures with cement, water, aggregates, etc. during the mortar manufacturing process to improve the properties and functions of concrete, and reinforcing concrete structures by penetrating or coating the surface of concrete structures. At the same time, there is a method of improving durability by imparting functionality. In other respects, concrete structures must meet structural engineering and functional usability. In other words, before use, conditions such as design, materials, formulation, construction curing, and during use, such as strength, durability, abrasion resistance, freeze-thawing resistance, sliding resistance flatness, vibration, water permeability, surface flexibility and ductility, economic efficiency, maintenance, etc. The condition must be met.

The present invention relates to the latter method of infiltrating or coating the concrete structure, that is, the technical field which must satisfy the conditions during the use of the concrete structure. As a serious problem due to premature deterioration of slab concrete, the polymer surface penetration method is used to infiltrate monomers (MONOMER) into the pores of concrete. Reaction, that is, polymer polymerization to improve the properties of concrete. Such methods increase the compressive, tensile, warpage, shear strength of concrete, increase the waterproofing effect, and increase the durability against freeze-thawing. Increase fatigue strength, such as salt and calcium chloride. Resistance to chemicals, abrasion resistance, surface softness and ductility Although it can increase, it is difficult to select catalysts, additive penetration promoters and crosslinking agents added to monomers, polymerization conditions, etc., and the equipment for infiltration must be accompanied. Especially on smooth concrete surfaces such as concrete roads and bridge decks Although it can be used for polymerization, it can be difficult to apply in complex concrete structures.

As another conventional technology, Korean Patent Publication No. 10-0279244 discloses an invention for waterproofing and anticorrosion by mixing and coating an aluminum powder as a concrete surface coating agent in a polyurethane resin or an epoxy resin dissolved in a solvent. As the structure of the coating agent, aluminum powder is oxidized into alumina, so it is expected to increase wear resistance. Corrosion resistance and waterproofness due to coating can be expected, but improvement of concrete properties due to penetration into concrete surface structure cannot be expected. It can be called a monotonous surface coating.

In addition, Korean Patent Registration (Registration No.:10-0566481) introduces a composition for surface treatment and a surface treatment agent. The composition of the technology is that of styrene-butadiene 30 to 60 based on 100 parts by weight of silica or aluminum oxide inorganic powder. As a composition for concrete surface treatment consisting of parts by weight, 0.2-30 parts by weight of activated carbon powder, 0.2-20 parts by weight of ocher powder, 3-20 parts by weight of water repellent, 0.5-2 parts by weight of thickener, 0.3-0.5 defoamer, and 40-130 parts of water. The concrete surface treatment agent is water-dispersed medium, and the SBR rubber component obtained by emulsifying styrene and butadiene using soap is added to the surface treatment agent so that it has flexibility and elasticity to the coating film and thus crack resistance to the coating film. Also, it can absorb volatile organic compounds harmful to human body and environment by adsorbing by adding powder activated carbon, loess powder, etc. By addition of such a composition, the strength of a coating film may be called the composition which weakens waterproofness.

The present invention improves the problems of the conventional concrete surface treatment composition to provide a concrete surface treatment coating composition that satisfies both excellent permeability and strong coating properties at the same time, by using an epoxy resin as a colorant, strong coating properties, electrical insulation and coaltal As it penetrates deeply into the tissue from the concrete surface, it has excellent water resistance, anti-aliphatic hydrocarbon and crude oil resistance, and it uses mica, roadmite, silica or silica sand powder as an additive, and excellent electrical insulation, prevention of deterioration by neutralization of concrete, It is an object to provide a surface treatment coating composition of concrete structures having heat resistance and wear resistance.

The present invention for achieving the above object is 50 parts by weight of coaltal as a weight ratio as a coating composition of a concrete structure consisting of mica, roadmite, silica or silica sand powder and solvents as a colorant as a functional additive and epoxy resin and hardener coltal, 60 parts by weight of epoxy resin, 10 to 15 parts by weight of one curing agent selected from polyamine and polyamide as curing agent, 6 parts by weight of mica powder, 7 parts by weight of doromite powder, 8 parts by weight of silica or silica sand powder, ester, ketone, toluene aromatic It can be referred to as a surface treatment coating composition composed of 30 to 40 parts of one solvent (diluent) selected from carbonated water (AROMATIC HYDRO CARBONS).

The concrete surface treatment coating composition obtained by the above method penetrates deeply into the concrete structure due to the excellent permeability by the coal tal when coated on the concrete surface, so it has excellent waterproofness and oil resistance, and has strong adhesive strength with epoxy resin, and excellent adhesion of the coating film. Very good plasticity, balance of hardness and corrosion resistance,

In addition to the addition of the functional material, the coating film may be referred to as a surface treatment coating composition of the concrete structure that is excellent in electrical insulation, heat insulation and wear resistance, and can prevent premature degradation due to the neutralization of the concrete structure.

In the present invention, the epoxy resin is a resin widely used in adhesives, molding materials, lining materials, paints, etc. Here, the epoxy resin used as the coating composition of the present invention is epicoat, and as a curing agent, DAT (diethylenetriamine, TTA (tree) Ethyleneamine) is a polyamine, which is added together with them, is a different material with the same shape and production process as asphalt, but also has different component ratios, and has different physical and chemical properties. There is also a big difference in commonality.

Coal tar has high carbon hydroxide content, 30 ~ 50% pitch, excellent coating adhesion, high permeability and high resistance to oil or diesel. As the above materials, the coating film formed through curing has excellent water resistance, alkali resistance, aliphatic hydrocarbon and crude oil resistance, and also has a coating film forming a thick film, and has a good balance of plasticity, hardness and adhesion. In addition, the coating layer withstands long-term outdoor exposure and has excellent corrosion resistance.

The mica powder added to the surface-treated coating composition of the present invention is different depending on the mineral, but the main components are SiO ₂ 50wt%, Al ₂ O ₃ 35wt% and the rest is a small amount of F ₂ O ₃ , TiO ₂ , CaO, MgO, A mineral powder consisting of K ₂ O and Na ₂ O, which has a high base substitution and excellent electrical insulation and thermal insulation. DOLOMITE, also called dolomite, has a white and pale green color, and its chemical composition is CaMg (CO ₃ ) ₂ . It is a mineral with a hardness of 4 and a specific gravity of 2.8. It is either layered or lenticular in limestone or secondary weathering veins in superbasic igneous rocks. The composition of such minerals is an example of roadmite light in Yeongcheon, Korea. 2.62% of SiO ₂ , 7.54% of Al ₂ O ₃ , 0.18% of Fe ₂ O ₃ , 22.9% of CaO, and 19.92% of Mg0 are shown as burning loss. Such mineral powder may be characterized by exhibiting deterioration prevention function due to neutralization of the concrete structure because it is superbasic.

In addition, silica is used as silica, and as an example of silica mineral, Jeonnam Gwangyang Quartz is SiO ₂ 95.7%, Al ₂ O ₃ 2.54%, Fe ₂ O ₃ 0.11%, CaO 1.702%, MgO 0.19%, and the rest is burning amount. As another raw material, silica powder containing SiO ₂ as the main raw material is used. Such silica or silica sand powder, together with SiO ₂ (silica) and Al ₂ O ₃ (alumina) which are main components of mica, improves the wear resistance and chemical resistance in the coating film.

In addition, when explaining the reactivity and composition of the concrete surface coating coating composition, the epoxy resin reacts well with the amines at room temperature. That is, the ring opening reaction of the epoxy group occurs due to the addition of the amine, and the bonding reaction between the epoxy groups causes the product to grow in three dimensions. It has a network structure and does not dissolve well in solvents with increasing viscosity, but dissolves well when mixed with active solvents such as esters, ketones and toluene used in the present invention.

In addition, the ratio of the curing agent to the epoxy resin is slightly higher than the reaction equivalent. The amount of the curing agent is slightly increased, and the hardness of the coating film may be increased due to the use of a few curing agents. In order to obtain the hardness of the coating film by relieving the hardness to some extent, and to increase the amount of mica, roadmite, silica, or silica powder, the wear resistance and thermal insulation of the coating film may be increased, but it may cause cracking of the coating film. There is a problem with the.

In this case, the coal-tal is penetrated to the inside of the mineral powder during the composition, and a considerable amount penetrates deeply into the concrete structure during the coating on the concrete surface. In addition, the epoxy resin has excellent adhesion and adhesion but not good penetration. At the time of composition, mineral powders such as mica, dolomite, silica or silica sand powder are put into the sealed container first, and the solution in which the epoxy and the hardener coltal are dissolved in the solvent is injected through the valve of the sealed container while the container is decompressed to 0.3 atm or less. The solution is allowed to fully penetrate into the mineral powder and then stirred and used.

As a result of testing the properties of the coating layer by coating the concrete structure coating composition prepared by the above method on the concrete surface, the test results as shown in the following Table (1) were obtained.

Table (1) Test result table of concrete composition coating film

Item Test result    1.compressive strength max 950kg / cm ²  2. flexural strength max 1180kg / cm ²           3. Traction force (tensile strength) max 512kg / cm ² 4. Elastic force 25.2kg / cm ² 5. Adhesion 29 kg / cm ² 6. Absorption  1.1% or less

In addition, after forming 10 columnar specimens having a diameter of 150 mm and a height of 300 mm with mortar for forming the structure in order to check the waterproofness and watertightness, the concrete composition was applied 0.8 mm twice in front of five specimens after 28 days of age. After the coating was formed to a thickness to form a coating film, five specimens that had passed 7 days and five that did not coat the composition were immersed in an aqueous solution in which the dye was dispersed, and the water-tightness test results were obtained as shown in Table (2).

Table (2) Watertightness Test Results Table

Sample Classification & Test Items Penetration depth of dyeing solution over time (mm) 5 days 10 days 15th 20 days 25 days 30 days  Specimens coated composition One 0 0 0 0 trace trace 2 0 0 0 0 0.1 0.2 3 0 0 0 0 trace 0.1 4 0 0 0 trace 0.2 0.5 5 0 0 0 trace 0.1 0.3  Specimen without coating composition A 4 7.5 10.5 14 17 21 B 3 7 9.5 12.5 16 20 C 5 8 11 15 19 23 D 2 5 8.5 11 14 17 E 2.5 6 9 12 15.5 19

(Note) Penetration depth is a measure of the depth penetrated from the surface of the concrete specimen to the inside.

As shown in Table 2, the depth of penetration of the dye solution from the surface of the specimen to the inside shows that the treated specimen does not penetrate the dye solution and the untreated specimen penetrates about 20 mm of dye solution. have.

These results can be seen that the water-tightness, water resistance of the surface-treated concrete structure and excellent chemical resistance, oil resistance, corrosion resistance, freeze thaw resistance can be estimated.

In addition, the surface hardness of the concrete structure is collected in the hardness range of 2.8 ~ 3.2, and the hardness of the coating layer of the composition is in the range of hardness of 4 ~ 4.3 range can improve the wear resistance of the surface treated concrete.

Claims (1)

50 parts by weight of coaltal containing 30 to 50 wt% of pitch, 60 parts by weight of epoxy resin, 10 to 15 parts by weight of polyamine or polyamide curing agent as curing agent, 6 parts by weight of mica powder, 7 parts by weight of dolomite powder, silica or silica sand Surface treatment coating composition of a concrete structure composed of 8 parts by weight of powder, ester, ketone, toluene, 30-40 parts of one active solvent selected from aromatic hydrocarbons.