KR101623163B1 - multilayer coating with preventing neutralization of concrete for surface of concrete and method for suface coating of concrete structure - Google Patents
multilayer coating with preventing neutralization of concrete for surface of concrete and method for suface coating of concrete structure Download PDFInfo
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- KR101623163B1 KR101623163B1 KR1020150162904A KR20150162904A KR101623163B1 KR 101623163 B1 KR101623163 B1 KR 101623163B1 KR 1020150162904 A KR1020150162904 A KR 1020150162904A KR 20150162904 A KR20150162904 A KR 20150162904A KR 101623163 B1 KR101623163 B1 KR 101623163B1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/4853—Epoxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/488—Other macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds
- C04B41/4884—Polyurethanes; Polyisocyanates
Abstract
The present invention relates to an epoxy primer layer comprising a clay particle surface-modified with a hydrophilic substituent and hydrophilic hollow particles; A primer layer, a primer layer, a hydrophilic hollow particle, a primer layer, a primer layer, and a hydrophilic hollow particle; And a solvent-free epoxy waterproof layer containing 3 to 30% by weight of a liquid rubber elastomer on the basis of the sum of the epoxy resin and the liquid rubber elastomer on the base material layer, and a multi-layer coating film for surface coating of the concrete structure The present invention relates to a surface coating method for a concrete structure.
Description
TECHNICAL FIELD The present invention relates to a composite multi-layer coating film for surface coating having a function of preventing the neutralization of concrete, which can be applied to the surfaces of concrete structures such as tunnels, subways, closure structures, bridges and water treatment facilities, and a surface coating method using concrete structures .
In general, steel structures including iron are exposed to corrosive environments in a natural environment. Therefore, in order to improve the weatherability of steel structures, it is common to perform corrosion prevention on the surface of steel structures to prevent corrosion.
The corrosion environments of steel structures are divided into dry corrosion and wet corrosion. Dry corrosion is corrosion caused by hot gas. Wet corrosion is caused by atmospheric corrosion, underwater corrosion (fresh water and sea water) Chemical corrosion (acid, alkali, salt) and underground corrosion. This corrosion can be expressed as follows.
The oxidation reaction at the anode: Fe → Fe + 2e-, reduction at the cathode: H 2 O + 1 / 2O 2 + 2e- → 2OH-, 2H + 2e → H 2 , total continuous reaction: Fe + 2OH → Fe ) 2 , 2Fe (OH) 2 + 1 / 2O 2 + H 2 O → 2Fe (OH) 3 The corrosion of the iron structure means that rust or red (Fe (OH) 3 , Fe 2 O 3 ) , Which can be seen as oxygen (O 2 ) and water (H 2 O) in the air. Such corrosion tends to be accelerated by gas, seawater salinity, and chemical corrosion (acid, alkali, salt) at high temperatures. However, the existing invention uses a corrosion inhibitor, such as chromic acid and nitrite, , Phosphoric acid, etc., or metal plating methods using metal pigments such as Cu, Zn, Cr, and Ni, which have a tendency to ionize more than iron corrosion, such as Zinc Oxide, Oxide (Sacrificial anode) using an anode as an anode.
Korean Patent No. 0503561 discloses a coating composition for improving the corrosion resistance and durability of a steel structure, and a coating method using an aluminum oxide coating using the same, wherein a coating using zinc, chromium, nickel, aluminum oxide or the like is applied to form a metallic coating on a steel structure And by this sacrificial anode method, an aluminum oxide film can be effectively used to prevent corrosion of steel structures and to improve durability.
In addition, currently used inorganic end-of-life paint, chlorinated rubber-based paint, epoxy-based paint and the like are as follows.
1. Inorganic latex paint
The following are known as anti-corrosive paints with the year-end end as main antirust agent. Called zinc rich paint, which is made by putting a high concentration of zinc powder or zinc fine powder into a small amount of resin.
2. Chlorinated rubber-based coating
Chlorinated rubber coatings, which are generally used in heavy-duty coatings, have a high drying speed, good interlayer adhesion, and are resistant to contamination and coastal environments. In particular, chlorinated rubber coatings are superior in transparency and oxygen permeability to other paints due to their excellent coating properties, which is advantageous for coating steel structures such as containers and ships.
3. Epoxy coating
Epoxy-based anticorrosive coatings have widely used various polyamine compounds, especially aliphatic polyamine compounds, as curing agents for epoxy resins for room temperature curing.
On the other hand, the water treatment facilities include water intake facilities, aqueduct, mixed water, coagulant, sedimentation, filter paper, advanced water treatment and drainage, etc. In particular, It can prevent leakage and increase the durability of facilities.
Generally, as the use period of concrete is elapsed, micro cracks and cracks due to an external force may occur in the joints and joints. If the corrosion is intensified, the buried reinforcing bars are also corroded and the durability of the structure is seriously deteriorated. And the water may penetrate into the concrete, and when the concrete is subjected to new construction or repair work for the bottom layer of a water purification plant or the like, a part of the water does not evaporate, In order to prevent adverse effects on durability, various waterproof materials are used to perform waterproofing work on structures such as outer walls and floors.
In this case, when the concrete surface is in a wet state, the waterproofing / coating material can not adhere to the construction surface properly, and the coating material may be lifted or cracked due to poor response to the behavior of the base surface.
In order to solve such a problem, JP-A-10-0947460 discloses a waterproof coating method for a polyurea concrete structure in which a coating material containing a polyurea resin as a quick curing resin is coated with a pinhole There has been disclosed a technique for preventing the occurrence of the occurrence of the concrete structure while ensuring that the adhesion of the coating layer on the wetting surface is firmly maintained even when the bottom layer of the concrete structure is wetted. If the water is contained in various types of pores present in the concrete structure, even if the surface is dried, water vapor pressure on the surface waterproofing layer interface due to the difference in humidity depending on the use environment When the bubbles are generated or expanded, Development, and swelling may occur, thus causing problems such as defects in waterproofing work.
On the other hand, Japanese Patent Laid-Open Publication No. 10-1227380 (Jan. 30, 2013) discloses a method of forming a low-viscosity epoxy primer layer comprising porous particles of nano-size capable of penetrating into the concrete surface of a wet environment and hydrophilic hollow particles, There is a need to improve the mechanical properties of the primer layer, the dispersibility of nano-sized porous particles in the epoxy resin is low, and the commonly used middle layer has a problem of impact resistance So that the function of interfering with the progress of the crack is deteriorated.
Therefore, it is possible to penetrate the concrete surface of the wet environment and improve the mechanical properties while overcoming the limit of the existing waterproofing / abrasive material, and when the water content of the concrete is high, the adhesion defect of the existing waterproofing material, water pocket, There is a continuing need for a multi-layer coating that can solve the problems and prevent the formation of cracks due to corrosion in the concrete to achieve long-term stability.
(Patent Document 1) KR10-05035610 B1
(Patent Document 2) KR10-0947460 B1
(Patent Document 3) KR10-1227380 B1
The present invention overcomes the limitations of conventional waterproofing / abrasive materials, and when waterproofing coating of the bottom layer is carried out under the condition that the concrete surface is dried less or the wet surface is hard to dry during the expansion or repair using concrete such as water treatment plant It is possible to solve problems such as adhesion failure, water pocket, floatation and the like of the existing waterproofing material when the water content of the concrete is high, and also to improve the mechanical properties of the primer layer in the coating material, To prevent formation or progression of cracks caused by the cracks, and to provide long-term stability.
The present invention also provides a surface coating method of a concrete structure for forming the coating film.
In order to solve the above problems, 1) an epoxy primer layer comprising clay particles surface-modified with a hydrophilic substituent and hydrophilic hollow particles; 2) a ground adjusting material layer comprising a water-soluble epoxy resin, a curing agent, and a cement powder, which floats the bottom surface of the concrete by hydration reaction with water existing in the concrete through the hydrophilic hollow particles on the primer layer; And 3) a solvent-resistant epoxy waterproof layer containing 3 to 30% by weight of a liquid rubber elastomer on the basis of the sum of the epoxy resin and the liquid rubber elastomer on the basis adjusting material layer. .
The present invention relates to a method for treating a concrete surface, Forming an epoxy primer layer comprising a clay particle surface-modified with a hydrophilic substituent and hydrophilic hollow particles; Forming a primer layer on the surface of the primer layer through the hydrophilic hollow particles to hydrate the primer layer with moisture present in the primer layer to form a primer layer comprising a water-soluble epoxy resin, a curing agent, and a cement powder; And forming a solvent-free epoxy waterproof layer containing 3 to 30% by weight of a liquid rubber elastomer on the basis of the sum of the epoxy resin and the liquid rubber elastomer on the basis adjusting material layer. The surface coating method of the present invention.
The multi-layer coating film according to the present invention is capable of penetrating into the concrete surface in a wet environment, and the conventional waterproofing material has a problem that the water content of the concrete is high and the moisture is present in the matrix, such as adhesion failure, water pocket, The dispersibility of the particles of the primer layer in the coating material is good, the mechanical properties of the primer layer are improved, and the moisture permeability of the primer layer is high, so that the movement of water in the primer layer can be freely performed. Can be easily processed and the primer layer can be formed in a more environmentally friendly manner.
In addition, the solvent-free epoxy provides excellent strength at a high crosslinking density, but has weak properties against brittleness and is weak against shock and vibration. Therefore, it has a disadvantage that its use as a structural material requiring toughness is limited. Accordingly, By adding a liquid rubber elastomer to the epoxy resin, it has an advantage of improving the toughness of the epoxy resin by preventing the progress of the crack.
1 shows an embodiment of a multi-layer coating structure of a concrete structure according to the present invention.
2 shows the results of measurement of the adhesion strength of the primer layer according to the present invention.
3 shows the results of measurement of the breathability of the intermediate layer according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings of the present invention, the sizes and dimensions of the structures are enlarged or reduced from the actual size in order to clarify the present invention, and the known structures are omitted so as to reveal the characteristic features, and the present invention is not limited to the drawings . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.
The multilayer coating film for surface coating of a concrete structure according to the present invention comprises: 1) an epoxy primer layer comprising clay particles surface-modified with a hydrophilic substituent, and hydrophilic hollow particles; 2) a ground adjusting material layer comprising a water-soluble epoxy resin, a curing agent, and a cement powder, which floats the bottom surface of the concrete by hydration reaction with water existing in the concrete through the hydrophilic hollow particles on the primer layer; And 3) a solvent-free epoxy waterproof layer containing 3 to 30% by weight of a liquid rubber elastomer on the basis of the sum of the epoxy resin and the liquid rubber elastomer on the basis adjusting material layer.
The primer layer according to the present invention solves the problem that when the waterproofing material is used on the wet surface, the water content of the concrete is high and water content is present in the mother body, the phenomenon of adhesion failure, water pocket and floatation is solved, And further comprises a clay particle surface-modified with a hydrophilic substituent group and a hollow particle and an epoxy-based polymer compound having hydrophilicity in order to improve the dispersibility of the particles of the primer layer and to improve the mechanical properties thereof.
The primer layer includes clay particles that are surface-modified with a hydrophilic substituent, thereby enhancing the mechanical properties of the epoxy polymer, effectively absorbing moisture contained in the pores of the concrete and serving as a pathway for transferring the water to the hydrophilic hollow particles , And after the transfer of the water, it penetrates into the pores of the matrix together with the low viscosity solvent-free epoxy resin and plays a role of suppressing bubbles and increasing adhesion.
In addition, the primer layer used in the present invention contains hydrophilic hollow particles and stores moisture absorbed by the clay particles surface-modified with a hydrophilic substituent or stored in the hollow space inside the particles, and also contains cement and hydration Allow the reaction to consume water .
In addition, the hydrophilic hollow particles serve to increase the adhesion of the primer layer to the primer layer by increasing the surface area of the primer primer and having a rough surface.
The clay particles surface-modified with the hydrophilic substituent group according to the present invention may be clay particles whose surface is modified with a silicone compound having a terminal amine group. In general, clay particles can be surface modified by organic materials.
For example, a clay particle containing a hydroxy group whose surface is hydrophilic may react with the alkoxy group in the clay surface by reaction with an organic material including an alkoxy group bonded to a silicon atom, The surface modification of the organic material is possible by forming a covalent bond with the clay surface.
In the present invention, by introducing a substituent having an amine group at the terminal of the remaining connecting portion of the silicon atom, the clay particles modified with the silicone compound having the amine group at the terminal of the surface of the clay particle are introduced into the primer layer Gt; and / or < / RTI >
In the following figure A, the structure of the clay particles modified with a silicone compound having an amine group at the end thereof according to the present invention is illustrated and shown.
[Picture A]
Meanwhile, in order to prepare the surface modified clay particles of the present invention, the clay may be subjected to a surface modification reaction after organizing the cation with a quaternary ammonium salt before the surface modification reaction.
The clay particles whose surfaces have been modified with the silicone compound having an amine group have polarity properties compared to the clay particles whose surface is modified with a silicone compound having an alkyl group or the like corresponding to a usual non-polar functional group, The dispersibility with the epoxy polymer can be improved. In addition, by modifying the surface of the clay particles to be more hydrophilic, it is possible to effectively absorb the moisture contained in the pores of the concrete.
As the silicone compound having an amine group, those exemplarily usable in the present invention include 2-aminoethyltriethoxysilane, 3-aminopropyltriethoxysilane, 4-aminobutyltriethoxysilane, N- [3- Methoxysilylpropyl] ethylenediamine and the like can be used.
Meanwhile, the clay particles used in the present invention include clay minerals made of natural or synthetic materials, and examples thereof include montmorillonite, iron mononylonite, bederite, saponite, hectorite, stevensite, nontronite, , Strontium titanate, smectite, strontium titanate, and smectite.
In addition, the clay particles that have been surface-modified with the hydrophilic substituent may be present in a flaky form after being subjected to the surface modification reaction as shown in FIG.
In the present invention, in order to more effectively obtain the clay particles having a two-dimensional structure in the form of a flake through the peeling process, the primer composition may be subjected to ultrasonic treatment before forming the primer layer.
The flaky nano-sized particles may be directly mixed with the composition for forming the primer layer or may be mixed with the primer layer in the form of other coating materials such as urethane resin, silicone resin and the like.
The hydrophilic hollow particles according to the present invention can be used in the form of hollow porous silica, hollow structure plastic, hollow structure alumina, ultra-light micro hollow spheres formed by firing igneous rocks, MgO, CaCO 3 , TiO 2 , Fe 2 O 3 , BaTiO 3 , (HfO 2 ), SrTiO 3 , ZrO 2 , SnO 2 , and CeO 2 .
The hydrophilic hollow particles may have a size of 10 to 200 μm and the hydrophilic hollow particles may be directly mixed with the composition for the primer layer or may be added to the primer layer in the form of other coating materials such as urethane resin, Can be mixed.
Meanwhile, in the present invention, the epoxy primer layer may be formed using a composition including an epoxy resin, an aqueous solution and a water-soluble amine curing agent, in addition to the clay particles and the hydrophilic hollow particles.
The above-mentioned epoxy resin is characterized by being excellent in toughness and high-temperature characteristics of a coating film when forming a coating film as a solid epoxy resin, and excellent in chemical resistance and water resistance, and is free from generation of volatile substances and shrinkage of volume at the time of curing, When curing, it has a large adhesive force on the surface of the conductor.
In this case, the composition comprises 3 to 10% by weight of surface modified clay particles as hydrophilic substituents, 5 to 20% by weight of hydrophilic hollow particles, 30 to 60% by weight of epoxy resin, 10 to 40% by weight of aqueous solution and 20 to 40% % ≪ / RTI > by weight.
Illustratively, the epoxy primer layer may be a water-soluble epoxy resin. If the content of the epoxy resin is too small, the adhesive strength may be lowered and the strength of the coating film may be lowered. If the epoxy resin content is too large, it may become difficult to transfer and discharge moisture,
Also, if the content of the surface modified clay particles and the hydrophilic hollow particles are too high, the strength of the coating film may be impaired and the moisture of the matrix may be continuously supplied, resulting in a decrease in the adhesion strength of the coating film or a water pocket phenomenon. If it is small, it will not show effective physical properties.
In addition, the aqueous solution can be used as a diluent. Since the epoxy resin used is highly viscous or is difficult to impregnate in the case of a solid epoxy resin, the viscosity can be lowered by using the epoxy resin dissolved in an aqueous liquid. By using an aqueous solvent, It can be formed under environmentally friendly conditions when the primer layer is formed.
When the content of the aqueous solution is out of the above range, the viscosity is low and sedimentation of the filler occurs, and the mixing becomes uneven and various properties are deteriorated.
The amine curing agent has a chain structure. It reacts with the organic group of the epoxy resin while increasing the cross-linking density, thereby improving the surface hardness and adhesion and promoting curing. The amine curing agent can react with the epoxy resin .
Wherein the amine curing agent is a modified aliphatic amine, a modified aromatic amine, or a mixture thereof, wherein the modified aliphatic amine is selected from the group consisting of diethylenetriamine, triethylenetetramine, diethylaminopropylamine, mentantiamine, N-aminoethylpiperazine, Diamine and isophorone diamine, and the modified aromatic amine may be at least one selected from the group consisting of metaphenylenediamine, diaminodiphenylmethane, and diaminodiphenylsulfone.
If the content of the amine curing agent is small, an appropriate curing effect can not be given. If the content is in excess of the above range, the hardness of the coating film becomes excessively high due to excessive curing, so that the above range is preferably used.
The coating thickness of the primer layer of the present invention is preferably in the range of 0.05 to 0.30 mm. If it is thinner than this, it can not maintain the strength of the coating, and it can not effectively wet the surface or pores of the concrete, thereby hindering the adhesion. In case of a thick coating, it becomes difficult to move and discharge moisture. .
The primer layer is applied to the primer layer by using an aqueous solution, but it is more environmentally friendly than a general organic solvent. However, when the primer layer is not sufficiently dried, moisture may remain, so care must be taken.
Also, the background adjusting material used in the present invention may be a conventional epoxy cement mortar, but it may react with the moisture of the concrete matrix provided from the hydrophilic hollow particles of the primer layer to increase the adhesion between the primer and the substrate adjusting material, It is a technical feature that it acts to increase the adhesion of the underground and concrete by consuming the existing water. The water-soluble epoxy resin may be 10 to 15 wt%, the curing agent may be 20 to 30 wt%, and the cement powder may be 55 to 70 wt% .
The curing agent may be any one selected from a phenol resin, a urea resin, a melamine resin, an unsaturated polyester resin, an acrylic resin, an oxetane resin, a diallyl phthalate resin, a polyurethane resin, a silicon resin, a maleimide resin, a thermosetting polyimide resin Or more.
The thickness of the background adjustment material layer is preferably 0.5 to 1 mm, and may be applied twice or more as needed.
The solvent-resistant epoxy waterproof layer used in the present invention is used as a middle layer, and comprises 30 to 50% by weight of a modified epoxy resin, 20 to 40% by weight of a curing agent and 30 to 50% by weight of a filler for protecting a water- A waterproof non-solvent epoxy waterproof layer can be used.
At this time, the modified epoxy resin contains 3 to 30% by weight of the liquid rubber elastomer based on the sum of the epoxy resin and the liquid rubber elastomer.
The epoxy resin containing the liquid rubber elastomer in the present invention exhibits high strength when the content of the elastomer is low. However, as the content of the elastomer is increased, the tensile strength is lowered and the elongation is increased. When the content of the elastomer is higher than a certain level, The intermolecular interdiffusion is reduced due to excessive chain entanglement and the elastic epoxy system has an incomplete matrix structure. Therefore, the elongation rate may decrease, and the liquid rubber elastomer may be used in the range of 3 to 30 By weight.
The liquid rubber elastomer may be at least one selected from the group consisting of ATBN (Amine Terminated Butadiene Acrylonitrile), CTBN (Caboxyl Terminated Butadiene Acrylonitrile), HTBN (Hydroxyl Terminated Butadiene Acrylonitrile) and chloroprene rubber (CR).
In this case, since the CTBN has a limitation in use in which it reacts with the epoxy resin only at a high temperature, it is convenient to use ATBN which can react with the epoxy resin even at room temperature.
When the liquid rubber elastomer infiltrates into the network structure of the epoxy resin, if the reactive liquid rubber, the resin, and the curing agent are uniformly combined at a low temperature to such a degree that the curing reaction can occur, the molecular weight of the epoxy matrix is cured And the elastic body can form a second dispersed phase in the cured resin, and as a result, the elastic region dispersed in the network structure of the epoxy acts to prevent the progress of the crack, thereby preventing the neutralization of the concrete Term stability.
Also, by lowering the gas permeability of the coating film formed in the case of the epoxy resin including the liquid rubber elastomer, carbon dioxide contained in the air can be prevented from permeating to the concrete, which can help prevent concrete neutralization.
Here, the neutralization of concrete means that the surface of concrete in a strongly alkaline state is changed into a weakly alkaline state by infiltration of carbon dioxide gas or acid rain, etc. in the atmosphere, thereby promoting the progress of cracking of concrete, thereby promoting aging of concrete, Lt; / RTI >
That is, the unneutralized concrete {Ca (OH) 2; calcium hydroxide} has strong alkalinity with PH12 ~ 13, but it is in contact with carbon dioxide (CO2) H2O), the corrosion of the entire structure of the concrete accelerates due to the neutralization of the concrete, and the volume expansion (about 2.5 times to 7 times) occurs due to the rupture of the reinforcing bar, thereby pushing the concrete on the surface of the reinforcing bar. In the present invention, by using an epoxy resin containing a liquid rubber elastomer in the middle layer, concrete neutralization can be prevented.
On the other hand, as the filler contained in the epoxy waterproof layer as the intermediate layer, calcium carbonate or zinc oxide can be used to disperse and hydrate the clay particles surface-modified with a hydrophilic substituent. Since calcium carbonate or zinc oxide is used as the filler, it is not necessary to add another filler, and other cryoprotectants, preservatives, thickeners, hiding agents, and the like may not be added.
The middle layer preferably has a thickness of 0.3 to 2 mm, and may be finished with a medium-exposed coating under a condition in which no top is required.
Also, in the present invention, the top layer can be selectively used within a range of outdoor use that is exposed to ultraviolet rays requiring weather resistance or special use that requires properties of oxidation resistance and ozone resistance.
In addition, the top coat layer may include a fluororesin selected from fluoroacryl urethane or a polysiloxane containing fluorine as an overcoating coating material to have oxidation resistance and ozone resistance on the solvent-free epoxy waterproof layer.
Normally used fluoropolymer has antifouling property and antifouling property, but since fluoropolymer is high in practical use and economical problem should be taken into consideration, a small amount of fluoropolymer can be added to polysiloxane.
For example, the type of the fluororesin may include RCH 2 CH 2 OH or RCH 2 CH 2 OOCCH = CH 2 . Here, R may be a fluororesin of CF 3 (CF 2 ) 8 , preferably RCH 2 CH 2 OH (FC-C-1022, Korea Fine Chemicals).
The fluororesin may be used in an amount of usually 2 to 30%, preferably 3 to 15%, and the upper layer may have a thickness of 0.1 to 0.5 mm. For example, as the fluororesin, a polysiloxane containing 3 to 15% of a fluororesin may be used.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 illustrates a coating structure for a bottom layer of a concrete structure according to an embodiment of the present invention. In order to form the multilayer coating film shown in FIG. 1, the surface of the
1. Surface treatment of concrete layer (50)
The surface treatment of the
2. Step of forming primer layer (10)
In the second step, the
More specifically, an aqueous solution of an amine curing agent is mixed with an epoxy resin part containing clay particles surface-modified with a hydrophilic substituent, a hydrophilic hollow pigment and an aqueous solution, with an equivalent ratio of 1: 0.8 to 1: 1.2, It can be painted on the concrete surface by using a brush or airless spray.
It is preferable that the coating thickness of the
The coating layer may be a brush or a roller, and the entire surface may be coated through an airless spray, and the nozzle diameter and the injection pressure may be changed according to working conditions.
3. Step of forming the background adjustment layer (20)
A base adjusting layer is formed using a water-soluble epoxy resin, a curing agent, and a cement powder, which are composed of 10 to 15 wt% of a water-soluble epoxy resin, 20 to 30 wt% of a curing agent, and 55 to 70 wt% of a cement powder.
The base adjusting layer is a three-component epoxy cement mortar using a water-soluble epoxy resin as a base material, an amine mixture as a hardening agent, and a cementitious ceramic mixture as a powder, and is used for the purpose of reinforcing and adjusting the strength of concrete. Through which it reacts with the moisture of the mother to consume water.
4. Step of forming a water-repellent epoxy waterproof layer (30)
30 to 50% by weight of a modified epoxy resin, 20 to 40% by weight of a curing agent, and 30 to 50% by weight of a modified epoxy resin, which contains 3 to 30% by weight of a liquid rubber elastomer based on the sum of an epoxy resin and a liquid rubber elastomer, 30 to 50% by weight of a filler The intermediate layer is formed by using a solventless epoxy waterproof layer.
For this purpose, a liquid rubber elastomer such as ATBN (Carbonyl Terminated Butadiene Acrylonitrile), CTBN (Caboxyl Terminated Butadiene Acrylonitrile) or chloroprene rubber (CR) is mixed with bisphenol A or bisphenol F epoxy resin, and a reactive diluent, With an equivalent ratio of 1: 0.8 to 1: 1.2, and the mixture is uniformly coated with a brush or roller or an airless sprayer.
It is preferable that the intermediate layer has physical properties satisfying KS F 4921 since it can be finished only by itself if it is not an environment requiring acid resistance and ozone resistance or an environment exposed to the outside and requiring weather resistance.
5. Formation of
A coating layer of the non-staining fluororesin composition is formed on the intermediate layer formed as described above. The non-staining fluororesin composition may include a fluorine-containing resin, a hydrophilicity-imparting agent, a hydrolysis accelerator, and a curing agent. As the fluorine-containing resin, a fluorine resin having a hydroxyl value of 50 to 150 mg KOH based on the solid content and a molecular weight of 2,000 to 100,000 is preferably used, though not necessarily limited thereto. For example, the fluororesin may be fluoroacrylic urethane or a polysiloxane containing 3 to 15% of a fluororesin. In the present invention, there is no particular limitation on the coating method of the upper layer. For example, spray coating or roller may be used to coat the upper layer layer so that the dry film thickness is preferably 50 m or more.
Examples 1 to 5 (Preparation of multi-layer coating film - Evaluation of characteristics of primer layer)
In order to check the physical properties of the primer, which is a main technical feature of the present invention, the specimen of the concrete structure was cured and immersed for 7 days and dried at room temperature (25 ° C) for 2 hours to prepare a specimen having a water content of 40% Respectively.
A primer layer composition having a composition of clay particles, hydrophilic hollow particles, epoxy resin, and an aqueous solution and an amine curing agent aqueous solution surface-modified with the hydrophilic substituents of the components listed in Table 1 below was used on the surface of the pretreated specimen, Two-component primers formed of a hydrophilic hollow particle, an aqueous solution and an epoxy resin-containing PART A and an amine-containing curing agent (PART B) were uniformly dispersed for about 2 to 5 minutes using a power agitator (RPM 500-1,000) And then coated (thickness: ~ 0.1 mm) using an airless spray device.
Here, in order to prepare the clay particles surface-modified with the hydrophilic substituent, montmorillonite (Examples 1 to 4), which is a natural clay, and montmorillonite (Example 5), in which montmorillonite was subjected to an organizing treatment with a quaternary ammonium salt, were respectively used.
Aminopropyltriethoxysilane was used as the aminosilane for the surface modification of the clay, and the mixture was dispersed in a 2-liter xylene solvent or an ethanol solvent under a nitrogen atmosphere in a 10-liter reactor for one day at 80 DEG C with stirring, 3-aminopropyltriethoxysilane was added to the above clay at a weight ratio of 2: 1 and reacted. Thereafter, the solid phase product was reprecipitated, filtered, washed with acetone, and dried in a vacuum oven for two days to obtain silane-surface-modified clay particles containing an amino group.
The surface modified clay particles were used in the subject along with hydrophilic hollow particles of ultra lightweight hollow microspheres obtained by hot foaming igneous rocks having an average diameter of 65 μm and 0.15 (g / cm 2 ) in the volume ratio.
On the other hand, the background adjusting material was coated once (coating amount: 0.5 m 2 / kg) so that the coating thickness was 1 mm so that the substrate adjusting material layer containing 13 wt% of water-soluble epoxy resin, 24 wt% of curing agent and 63 wt% of cement powder .
And the curing agent are mixed in a mixing container, and the mixture is homogeneously mixed with a high-speed stirrer (RPM 500-1,000) for about 3-5 minutes according to the indicated ratio using a power agitator. After mixing, gradually add cement powder and stir evenly. Mix with a high speed stirrer (RPM 500 ~ 1,000) for about 3-5 minutes. Thereafter, a trowel is used for finishing work on the completely hardened primer layer.
In order to form the intermediate layer on the base material layer, 3.9 g of ATBN as a liquid rubber elastomer, 1.0 g of an epoxy resin (DGEBA type epoxy YD-128, 12500 cps, EEW = 185 to 190 a solvent-free epoxy waterproofing layer composed of 35% by weight of a curing agent and 25% by weight of a curing agent and 36.1% by weight of a filler was mixed at a weight ratio of 4: (RPM 500 ~ 1,000) for about 2 ~ 5 minutes and then sprayed using an airless sprayer. The coating thickness was 150 占 퐉 and applied twice (coating amount: 5.0 m < 2 > / L) upon spray application.
Finally, fluorine acrylic urethane containing fluorine resin was uniformly mixed at a mixing ratio of 6: 1 with a blend ratio of 6: 1 (RPM 500 ~ 1,000) for about 2 ~ 5 minutes, To form a multilayer coating film structure coating of the present invention.
Comparative Examples 1 to 2
As Comparative Example 1, in Example 1, except that a primer layer containing no hydrophilic hollow particles and a clay particle surface-modified with a hydrophilic substituent was applied to the primer layer to prepare a multilayer coating (Comparative Example 1) The same process was carried out. In this case, the amount of the low viscosity epoxy resin corresponding to the hydrophilic hollow particles and the clay particles surface-modified with the hydrophilic substituent was supplemented.
As Comparative Example 2, the same processes as in Example 1 were carried out except that the multilayer coating film was prepared without using the surface modified clay particles in Example 2 (Comparative Example 2).
Suzy
Table 2 below shows the performance comparison examples of concrete specimen Examples 1 to 5 and Comparative Examples 1 and 2 in which the multilayer coating film of the present invention is formed as described above.
In the below, the adhesion strength in the standard state was measured on the cement mortar according to KS F 4929, and the adhesion strength of the multi-layer coating film including the primer layer according to the present invention and the adhesion strength of the multi- The measurement results are shown in Fig.
(kgf / cm2)
As shown in Table 2, the multi-layer coating film having the primer layer and the background adjusting layer including the hydrophilic hollow particles of the present invention and the clay particles surface-modified with the hydrophilic substituent had higher adhesion strength and higher mechanical strength than Comparative Example 1 or Comparative Example 2 It shows that the physical properties are excellent and the adhesion performance of the hygroscopic floor is excellent. Therefore, it is considered that the improved characteristics of the base surface in the wet environment will be exhibited.
Examples 6 to 8 (Preparation of multi-layer coating film - epoxy waterproof layer (intermediate layer))
In order to check the physical properties of the epoxy waterproof layer (intermediate layer) according to the liquid rubber elastomer content in the intermediate layer according to the present invention, the intermediate layer was prepared according to the contents shown in the following Table 3, and the remaining layers were formed according to Example 1 So that a composite coating film was formed.
As a method for producing the intermediate layer, first, an epoxy resin and a liquid rubber elastomer were mixed and dispersed with an epoxy resin in an amount of 5, 15 and 22 wt%, respectively, based on the sum of an epoxy resin and a liquid rubber elastomer at 80 ° C Then, a hardening agent and a filler were added, and the mixture was stirred for 2 to 3 minutes.
After vacuum degassing was carried out using a vacuum pump to complete degassing, the specimens were poured into a mold. The specimens were cured at 25 DEG C for 7 days and cured in an oven at 80 DEG C for 3 days in order to eliminate dense curing and unreacted materials.
In this case, ATBN was used for the liquid rubber elastomer, and DGEBA type epoxy YD-128 (12500 cps, EEW = 185 to 190 g / mol, n = 0.12 to 0.13) Modified cycloaliphatic amine type ancamine 2635 (AHEW = 78) was used.
Comparative Examples 3 to 4
As Comparative Example 3, proceeding in the same manner as in Example 1, except that the content of the liquid rubber elastomer was 36 wt% based on the content of the epoxy resin, the content of the filler was decreased to form the intermediate layer, As Example 4, an epoxy resin not containing a liquid rubber elastomer was included in the above Example 1, and an intermediate layer was formed by supplementing the filler as much as the amount not containing the liquid rubber elastomer to form a mid layer.
(10)
(5)
(15)
(22)
(36)
(0)
The performance comparison charts of the intermediate layer Examples 1, 6 to 8 and Comparative Examples 3 and 4 of the present invention are shown in Table 4 below.
The mechanical properties were measured by using the UTM machine and the permeability was measured by the performance standard of KS F 4936 (Concrete protection coating material). And the weight of the moisture absorbent in the cup was measured after 24 hours after the inlet of the cup was covered with the coated film. The results are shown in Table 4.
One
4
As shown in the above table, in the case of using the solvent-resistant epoxy waterproof layer containing the liquid rubber elastomer of the present invention, the elongation was increased as the content of the liquid rubber elastomer was increased, but not more than a certain amount (Comparative Example 3) . This is considered to be due to the incomplete matrix structure of the elastic epoxy system as the intermolecular interdiffusion is reduced due to the excessive chain entanglement due to the increase of the viscosity of the sample due to the increase of the elastomer content. Such an increase in the elongation of the epoxy coating layer can flexibly cope with the movement of the building due to the expansion and contraction vibration, thereby preventing the occurrence of cracks.
Also, the Tg decreases as the content of the liquid rubber elastomer increases. It can be interpreted that the liquid rubber elastomer improves the workability by improving flowability and the fluidity of the segment is increased and the free volume is increased to decrease the Tg. Such free volume exists in the elastic region in the epoxy matrix, .
Also, it can be confirmed that as the content of the liquid rubber elastomer increases through the air permeability test, the ventilation performance becomes lower. By lowering the gas permeability of the epoxy coating, carbon dioxide contained in the air can be prevented from penetrating into the concrete, which can help prevent concrete neutrality.
As seen from the above examples, the solvent-resistant epoxy waterproof layer comprising the liquid rubber elastomer of the present invention has a function of preventing cracks from proceeding, and has a function of preventing the neutralization of concrete, .
10;
30; Solvent-free epoxy
50; Concrete layer
Claims (10)
2) 10 to 15% by weight of a water-soluble epoxy resin, 20 to 30% by weight of a curing agent, and 20 to 30% by weight of a water-soluble epoxy resin for flattening the bottom surface of the concrete by hydration reaction with water present in the concrete through the hydrophilic hollow particles, 55 to 70% by weight; And
3) a solvent-resistant epoxy waterproofing layer containing 3 to 30% by weight of a liquid rubber elastomer based on the sum of a solid epoxy resin and a liquid rubber elastomer on the base adjusting material layer; Coatings.
Wherein a top layer of a fluororesin selected from fluorine acrylic urethane or a polysiloxane containing fluorine is additionally formed to have oxidation resistance and ozone resistance on the solventless epoxy waterproof layer.
A clay particle and a hydrophilic hollow particle which are surface modified with a hydrophilic substituent, wherein the hydrophilic substituent is a silicone compound having a terminal amine group, and the surface modification reaction is carried out after organizing the cation with a quaternary ammonium salt before the surface modification reaction, Forming an epoxy primer layer formed using 3 to 10% by weight of hydrophilic hollow particles, 5 to 20% by weight of hydrophilic hollow particles, 30 to 60% by weight of an epoxy resin, 10 to 40% by weight of an aqueous solution and 20 to 40% by weight of an aqueous solution of an amine curing agent;
10 to 15% by weight of a water-soluble epoxy resin, 20 to 30% by weight of a curing agent, and 55 to 30% by weight of a cement powder, which hydrate the water present in the concrete through the hydrophilic hollow particles to the top of the primer layer, To 70% by weight of the composition; And
And forming a solvent-resistant epoxy waterproof layer containing 3 to 30% by weight of a liquid rubber elastomer on the basis of the sum of the solid epoxy resin and the liquid rubber elastomer on the base adjusting material layer. Surface painting of structures.
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| KR20180063724A (en) | 2016-12-02 | 2018-06-12 | 자암건설(주) | Environmentally friendly water-soluble coating composition for neutralizing concrete and preventing salt damage and method of construction using the same |
| KR101977057B1 (en) * | 2018-08-14 | 2019-05-10 | 주식회사 정석케미칼 | Epoxy base waterproof paint composition for concrete structure with high durability and surface coating method of concrete structure facility using thereof |
| KR102294287B1 (en) * | 2020-10-08 | 2021-08-26 | (주)은일 | Paint composition based on water heavy duty, Heavy-duty coating method of steel structure using the same |
| KR102300111B1 (en) * | 2021-06-09 | 2021-09-08 | 주식회사 나린테크 | Steel Or Concrete Surface Repair And Reinforcement Painting Coating Method |
| KR102439535B1 (en) * | 2021-07-30 | 2022-09-02 | 주식회사 에코이앤씨 | Waterproofing and anti-corrosion method of structure surface using ozone-resistant paint |
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| JP4563878B2 (en) * | 2005-06-23 | 2010-10-13 | 電気化学工業株式会社 | Anticorrosive composite and process for producing the same |
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| KR20180063724A (en) | 2016-12-02 | 2018-06-12 | 자암건설(주) | Environmentally friendly water-soluble coating composition for neutralizing concrete and preventing salt damage and method of construction using the same |
| KR101977057B1 (en) * | 2018-08-14 | 2019-05-10 | 주식회사 정석케미칼 | Epoxy base waterproof paint composition for concrete structure with high durability and surface coating method of concrete structure facility using thereof |
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| CN115466533B (en) * | 2022-08-25 | 2023-11-10 | 中远关西涂料（上海）有限公司 | Preparation method of elastic self-layering methyl methacrylate protective material |
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