KR101177349B1 - Paint composition concrete - Google Patents

Abstract

The present invention is a concrete structure improved to improve the durability, neutralization prevention and pollution resistance of the concrete structure by applying a coating (combi-coat) mixed with inorganic silicate to a two-component type acrylic urethane to the concrete structure The present invention relates to a coating composition for preventing salting and neutralization, and a method for preventing salting and neutralizing concrete structures using the same.

To this end, the present invention is an inorganic coating composition for coating after the pre-treatment process of washing and puffing the surface of the concrete structure to extend the durability life of the concrete,

The inorganic coating composition is 65% by weight of the two-component type acrylic urethane resin, 30% by weight of toluene, 0.1% by weight of catalyst, 0.3% by weight of binder (silane: Dow Corning Z6040), 4.4% by weight of antifoam, 0.2% by weight of antifoaming agent. Mixed salt and anti-neutralizing agent; A curing agent containing 50% by weight of resin (Resin) consisting of vinyl resin, acrylic resin and epoxy resin and 50% by weight of toluene as a solvent is mixed in a ratio of 8: 1 by weight, and 100 parts by weight of the mixture. 5 to 10 parts by weight of toluene was further mixed as a solvent to prepare a coating composition for preventing salt and neutralization of the concrete structure, and then repeatedly applied twice with a thickness of 100 μm using a spray gun for paint coating.

Painting, putty, concrete, hardener, salt prevention, neutralization

Description

Paint composition concrete to prevent salt and neutralization of concrete structure

The present invention is a concrete structure improved to improve the durability, neutralization prevention and pollution resistance of the concrete structure by applying a coating (combi-coat) mixed with inorganic silicate to a two-component type acrylic urethane to the concrete structure The present invention relates to a paint composition for preventing salt and neutralization.

In general, deterioration in performance due to the deterioration of the durability of concrete structures requires significant costs for repair and reinforcement, construction and maintenance of bypass roads. It not only provides a factor to encourage anxiety, but also leads to weakened competitiveness and loss of credibility in the international community.

Therefore, the recent domestic construction environment is changing to maintenance and reinforcement of existing facilities rather than new investments, and to improve performance, and to maintain existing facilities and extend their lifespan in order to prevent overlapping investment of existing facilities. Interest in the back has soared recently.

Recently, due to the development of construction technology, concrete structures are becoming larger and higher, and there is an increasing tendency to emphasize the appearance such as harmony with the surrounding environment as well as the functions of the concrete structures themselves. Concrete structures are easily contaminated by various external factors, which can damage or destroy their appearance.

For example, in 2001, the Ministry of Construction and Transportation cost hundreds of billions of won for the maintenance of structures. For local governments, the cost of maintaining the structure accounts for 40% of the total construction budget. It is over.

In Japan, which is similar in environment to Korea, 48% of new facilities and 52% of existing structures are self-contained among the total construction budget in 2001, and the maintenance cost is expected to increase day by day.

In the meantime, the domestic construction of special paint coating method has little domestic data to verify durability and field application effect, but now it is gradually applied to special paint coating and underground roadway in Korea. There are cases of application to Mapo Bridge, Seongsan Bridge, Banpo Underground Roadway, and construction of concrete neutralization prevention and salt prevention such as Haengju Bridge, Geoje Bridge, Lava Dam Relocation Road Construction, Mobile-Yongin Road Construction, etc. This is an increasing trend.

In addition, the Seoul Metropolitan Subway Construction Headquarters and Seoul Metropolitan Subway Corporation are focusing on preventing neutralization of structures, and are planning to construct them in the future, or plan overall construction in the future. We are planning construction.

In particular, in order to ensure long-term durability, watertightness, and safety due to leakage and cracking of urban railways and large structures, the method of surface coating of concrete structures is most widely used at the time when the integrity, commonality, and usability of public structures are increased.

Epoxy, urethane, fluororesin, cement-based paints are widely used as a method of surface coating on concrete structures, and has the following characteristics.

division Acrylic resin system Urethane Resin Polymer Cement ingredient Acrylic copolymer resin
1 component type Acrylic urethane
Copolymer Resin Water-soluble emulsion resin
Portland cement

chapter

point
? 1 component type for easy use
? Various colors can be produced
? Excellent workability and economic efficiency
? Excellent adhesion
Excellent weather resistance and chemical resistance
? Excellent adhesion
? Good wear resistance
? Excellent workability Environmentally friendly as water system
Excellent adhesion with cement products
? Excellent breathability
? Thick film construction is possible compared to other methods

only

point
Weather resistance is lower than other construction methods
? Aging is easy
There is no crack suppression effect
? High price
? Convenient to use due to two-component type
There is no crack suppression effect
? Not breathable
? High price As air system, temperature is not usable below 0 degrees Celsius
? Strength drops
? Workability is low
Color is extremely limited
? The surface is rough

In the above paints, products made of only organic systems have excellent adhesion to concrete structures, but lack of breathability, and have a problem of dropping little by little from the surface of the structure as time due to shrinkage and expansion due to temperature changes.

In addition, most of the urethane and epoxy paints used in the art are synthetic resins extracted from petroleum as binder components, and organic solvents of petroleum are used as solvent components, but volatile compounds such as phenol, formaldehyde, toluene, and xylene are used for these components. Because it contains a substance, the organic base material is coated on the inorganic base material, so it is inferior in durability and poor in adhesion with concrete.

In addition, it is not breathable, its durability deteriorates over a long period of time, and the risk of fire due to the hassle of repainting due to failure of exertion by the external environment after 4 ~ 5 years and containing volatile materials during construction Is holding. In particular, urban structures frequently exhibit surface contamination or damage due to fine dust in the atmosphere, various organic matters, and acid rain. For this reason, in order to keep the surface clean, the exterior walls of the concrete structure are cleaned using various chemicals or detergents.

However, the conventional washing operation uses various chemicals or detergents, so that the number of times, the problem that the concrete surface is damaged, rather than causing a problem, the worker who cleans the outer wall of high-rise building is always exposed to danger, It caused a life-threatening accident.

In order to solve this problem, in recent years, efforts have been made to construct a coating material having a function of preventing pollution in advance on the surface of a concrete structure.

In Japan, about 150 kinds of repair materials and construction methods are currently being used, and various materials and construction methods are being applied to various types of structures depending on the type of structure and the cause of performance deterioration. FHWA, in 1998-2003, is investing $ 17 million annually to develop new materials for maintenance, preoccupying the global construction market.

However, in Korea, the development of repair materials and construction methods for repair and reinforcement of concrete structures is much less than in advanced countries. Existing repair materials rely on imports, which leads to deeper technological dependency and increased unnecessary foreign currency outflow. In addition to the current state of the art, repair and reinforcement materials and construction methods that combine advanced technologies such as ET, IT, and mechatronic technology, which have been recently developed, have not been achieved at all.

On the other hand, paints surface-treated on concrete structures are intended to preserve the life of the concrete structure and exhibit reduced performance, in particular, anti-neutralization, so that conventional paints to maintain long-term adhesion and chemical resistance to concrete are pigments, anticorrosive agents or extenders. These resins have been formulated to maintain their effect. However, these paints use only resin as an adhesive base, so pigments, extenders, or anticorrosive agents protect the wastes. There is a problem that the front-end function is lost due to differentiation.

The present invention to solve the conventional problems as described above is to provide a coating composition for preventing salt and neutralization of concrete structures to improve the mechanical properties and durability of the structure to extend the durability life of the concrete.

In addition, the present invention is to prevent the neutralization of the concrete and to improve the pollution resistance, to evaluate the removal and construction and commonality of contaminants, and to utilize the construction results on site with the database (Database) to use in an eco-friendly construction that can be constructed and manufactured smoothly on site It is another object of the present invention to provide salt coating and anti-neutralization coating for concrete structures using salt composition and anti-neutralization paint composition which can contribute.

Hereinafter, preferred embodiments of the present invention will be described in detail.

In the inorganic coating composition for coating after the pre-treatment process to wash and pave the surface of the concrete structure to extend the durability life of the concrete,
The inorganic coating composition is 65% by weight of the two-component type acrylic urethane resin, 30% by weight of toluene, 0.1% by weight of catalyst, 0.3% by weight of binder (silane: Dow Corning Z6040), 4.4% by weight of antifoam, 0.2% by weight of antifoaming agent. Mixed salt and anti-neutralizing agent; A curing agent containing 50% by weight of resin (Resin) consisting of vinyl resin, acrylic resin and epoxy resin and 50% by weight of toluene as a solvent is mixed in a ratio of 8: 1 by weight, and 100 parts by weight of the mixture. 5 to 10 parts by weight of toluene is further mixed as a solvent to provide a coating composition for preventing salt and neutralization of concrete structures.

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In addition, the present invention is a method for preventing salt and neutralization of the surface of the concrete structure, characterized in that the coating composition prepared by the above method using a spray gun for paint coating twice repeated to the surface of the concrete structure with a thickness of 100μm per time to provide.

As such, the present invention has a structure that complements the strengths and weaknesses of each of the two-component type acrylic urethane by mixing inorganic silicates.

Unlike conventional products through the chemical reaction of acryl-urethane, inorganic silicates are mixed, which induces strong bonding to the body, densifying the concrete structure, thus forming a stronger film than conventional products, thereby preventing salt and neutralization.

That is, the initial physical properties of the composition of the present invention is represented by the organic acrylic urethane, and as time passes, the inorganic silicate maintains breathability and hardens on the surface of the structure to continuously protect concrete from external salts and acids. To form a film.

On the other hand, the silicates, in addition to various properties such as strong bonding strength, acid resistance, corrosion resistance, rust resistance, heat resistance, flame retardancy, etc., chemically reacts with the silicate inherent calcite components to densify the concrete structure to protect the concrete structure from salt and neutralization.

In addition, acrylurethane has the advantages of acryl, such as transparency and water resistance chemical resistance, and is a form that combines urethane's flexibility and water resistance, and expresses initial water resistance and chemical resistance to supplement the rather slow chemical bond of silicate. Do it.

In addition, the binder added in the present invention is a silane type binder (product of Dow Corning Z6040) which can supplement the initial adhesion with the base (concrete).

The silane plays a role of increasing the adhesion between the base material and the present composition by acting as a crosslinking role that combines inorganic and organic matter.

As a catalyst, 'dibutyl tin dilaurate organic complex' is used within 0.1 ~ 0.5% by weight, and it is possible to shorten the working time if used excessively because it controls the curing time.

Therefore, the present invention is effective in preventing the neutralization, deterioration prevention, flame resistance, pollution resistance of concrete.

The present invention by applying the ceramic paint, the inorganic paint to the concrete structure, the infiltration of corrosion factors such as neutralization, salt, freeze-thawing, acid rain, gas, etc. of the concrete is blocked, so that the inorganic paint for the life preservation and extension of the concrete structure Phosphorus ceramic paint adds ceramic powder to have affinity with concrete, imparts alkalinity of PH10 so that concrete has affinity, and mixes vinyl-based resin to increase chemical resistance to resin having relatively affinity with concrete. Adhesion Resin (acrylic resin) for adhesion enhancement and EPOXY Resin for flexibility were added, and UV absorber was added to prevent fading. Vinyl resin, acrylic resin and epoxy resin used at this time is a resin commonly used in the technical field to which the present invention belongs.

Hereinafter, the present invention will be described with reference to Examples according to each process.

<First Clearance>

As a process of removing foreign substances adhering to the surface of the concrete structure to be painted, various foreign substances are removed with a scraper or sandpaper, and then the surface is washed with high pressure washing water.

The cleaning operation is to deodorize the deteriorated concrete surface as a water jet, and removes dust and dust adhered to the concrete surface by using washing water having a pressure of 150 to 200 Bar and a discharge amount of 25 to 30 l / min.

Then, the moisture of the wash water adsorbed on the surface of the concrete structure is waited for a certain time to dry in the atmospheric state, and when the moisture content of the surface of the concrete structure is less than 8%, the basic putty work is performed.

The basic putty work is to use a variety of tools to fill the curved portion, the damaged portion of the surface of the concrete structure to the mortar to keep the surface flat as a whole.

<Second Underpainting>

Underpainting is a process for coating ceramic paint, which is an inorganic paint, on the surface of the concrete structure in which the ground clearance process is completed, and performs the first painting work, putty work, second painting work, and third painting work sequentially.

1. 1st painting work

After preparing a liquid paint by mixing 20-30% by weight of thinner in the ceramic paint, which is an inorganic paint, it is to coat the prepared paint on the surface of the concrete structure using a roll, airless or brush.

The coated paint layer has a thickness of 25 to 35 μ in a dried state, and if the thickness of the paint layer is not formed in one painting work, the coating work is performed again to form a desired coating film layer.

It takes about 4 hours to dry the primary coating work, and then to carry out the next step after drying.

2. Putty work

After the primary painting is completed, as a process for flattening the coating, the entire surface is flattened by filling an inorganic paint on the uncoated or uneven portion of the primary coating.

At this time, the inorganic paint used is not wide the paint range, it is advantageous to paint in a state in which the viscosity is not mixed with thinner to putty work.

3. 2nd painting work

After the putty work is completed, as a process for repainting, 20 to 30% by weight of thinner mixed with a ceramic paint, which is an inorganic paint, prepares a liquid paint, and then performs a painting work.

After about 4 hours, when the coated paint layer is dried, the coating operation is performed again so that the thickness of the coated layer in the dried state becomes 25 to 35 μ.

4. 3rd painting work

The 3rd painting work is for finishing painting after the 1st and 2nd painting work is completed, and is executed in the same way as the 1st and 2nd painting work, and 10 to 20% by weight of thinner is applied to the ceramic paint, which is an inorganic paint. After mixing the liquid to prepare a liquid paint and the coating work is carried out, and after 8 hours by repeatedly performing the coating work in a dried state, so that the thickness of the dried coating layer is 35 ~ 45μ.

<The third deadline painting>

In the paint composition for preventing salt and neutralization of concrete structures after finishing the above-mentioned coating work, that is, in the inorganic coating composition for painting after the pretreatment process,
The inorganic coating composition is 65% by weight of the two-component type acrylic urethane resin, 30% by weight of toluene, 0.1% by weight of catalyst, 0.3% by weight of binder (silane: Dow Corning Z6040), 4.4% by weight of antifoam, 0.2% by weight of antifoaming agent. Mixed salt and anti-neutralizing agent; A curing agent containing 50% by weight of resin (Resin) consisting of vinyl resin, acrylic resin and epoxy resin and 50% by weight of toluene as a solvent is mixed in a ratio of 8: 1 by weight, and 100 parts by weight of the mixture. 5 to 10 parts by weight of toluene is additionally mixed as a solvent to prepare a coating composition for preventing salt and neutralization of concrete structures.

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The salt and neutralization coating composition is repeatedly applied to the surface of the concrete structure with a spray gun for paint coating twice with a thickness of 100 μm.

Thus, the present invention is to complete the work by performing a pre-treatment process and a number of painting process, the concrete structure is 80 to 120μ thick coating layer is formed on the surface of the finished concrete structure, the concrete structure is applied to the various The cause of corrosion is blocked by the inorganic coating layer to ensure the life preservation and extension.

Meanwhile, the surface treatment method for preventing neutralization salt and chemical infringement according to the present invention has been described with reference to the accompanying drawings and specific embodiments, but the present invention is not particularly limited thereto and is within the scope of the technical idea of the present invention. Various modifications can be made by those skilled in the art.

As described above, the salt composition and the neutralization prevention paint composition of the concrete structure of the present invention are mixed with inorganic silicates in a two-component type acrylic urethane, respectively, to compensate for the strengths and weaknesses of the existing products, unlike the existing products by strong bonding and By densifying the structure, it forms a stronger film than the existing product, thereby preventing salt and neutralization.

In addition, in the present invention, the salt composition of the concrete structure and the neutralization prevention paint composition shows the initial physical properties of the organic acrylurethane, but as time passes, the inorganic silicate maintains air permeability and continuously reacts with the external salt by curing on the surface of the structure. There is an effect of forming a film to protect the concrete from the acid and it is an advantageous invention that can preserve and extend the life of the concrete structure.

Claims (1)

In the inorganic coating composition for coating after the pre-treatment process to wash and pave the surface of the concrete structure to extend the durability life of the concrete, The inorganic coating composition is 65% by weight of the two-component type acrylic urethane resin, 30% by weight of toluene, 0.1% by weight of catalyst, 0.3% by weight of binder (silane: Dow Corning Z6040), 4.4% by weight of antifoam, 0.2% by weight of antifoaming agent. Mixed salt and anti-neutralizing agent; A curing agent containing 50% by weight of resin (Resin) and 50% by weight of toluene composed of a vinyl resin, an acrylic resin, and an epoxy resin is mixed in a ratio of 8: 1 by weight, and toluene 5 to 10 based on 100 parts by weight of the mixture. Salt composition and neutralization prevention paint composition of the concrete structure, characterized in that the mixture by weight.