KR102493087B1 - Eco-friendly coating composition for thermal protection of concrete or steel structure and construction method using it - Google Patents

Abstract

The present invention relates to an eco-friendly coating agent with excellent neutralization and salt damage prevention functions and excellent heat shielding function, and in detail, an undercoat containing a water-based polymer resin, an alkaline aqueous solution, an extender pigment, a pigment, water, a wet dispersant, an antifoaming agent, and an adhesion promoter; It relates to an eco-friendly heat-shielding paint composition for protecting concrete and steel structures, characterized in that it comprises: an eco-friendly hybrid resin, a heat-shielding pigment having a solar heat shielding function, a topcoat containing a functional filler, a UV stabilizer, an adhesion promoter, and an antifoaming agent.
The present invention provides a heat-shielding paint composition for protecting concrete and steel structures containing an eco-friendly hybrid resin, heat-shielding pigment and functional filler, which is more environmentally friendly than conventional paints using general polyurea resins, and has a heat-shielding function and a function to prevent deterioration of structures. has the effect of A coating film formed of such a paint has an excellent solar heat reflection effect and a low thermal conductivity, and has an excellent insulation effect. Accordingly, there is an effect of saving energy and increasing the long-term durability of the structure by adjusting the internal temperature of the building made of concrete and steel structures.

Description

Eco-friendly coating composition with excellent neutralization, anti-salt damage and heat shielding functions, and construction method using the same {Eco-friendly coating composition for thermal protection of concrete or steel structure and construction method using it}

The present invention relates to an eco-friendly coating agent with excellent neutralization and anti-salt damage functions and excellent heat shielding function, and in detail, an eco-friendly coating agent with excellent neutralization and anti-salt damage function and excellent heat shielding function using an eco-friendly hybrid resin and heat shielding paint, and a manufacturing method thereof , And it relates to a construction method for coating the surface of a concrete or steel structure using such an eco-friendly coating agent.

In general, concrete is made through a hydration reaction in which sand, gravel, water, and other mixed materials are added to cement, and the cement and water react and harden. It is the central material. Despite the efforts of the designer or constructor, cracks occur in the concrete as described above after construction, and when carbon dioxide, water, chloride, etc. from outside penetrates into the concrete through these microcracks, the reinforcing bars in the concrete corrode and the concrete collapses. Problems can arise.

In other words. Carbonation, which causes corrosion of reinforcing bars in concrete due to the reaction of carbon dioxide and moisture over time in concrete structures; Deterioration occurs due to chloride intrusion or alkali-silica reaction in which highly alkaline cement and certain aggregates react and expand in the presence of moisture, causing cracks in concrete. shortened

In particular, with the recent rapid increase in traffic, the generation of carbon dioxide in the exhaust gas from vehicles is rapidly accelerating the neutralization rate of concrete. When the reinforcing bars in the concrete corrode, cracks and peeling of the concrete occur due to the expansion of the volume of the reinforcing bars, and in severe cases, it leads to the collapse of the structure. Therefore, as a way to solve the above problems, various coating agents for protecting concrete are being developed. Looking at the contents of patent applications for the technologies developed in this way, Korean Patent Registration No. 0723775 uses room temperature polyurea. Various patents are known, such as waterproof construction method of concrete structure, epoxy-modified polyurea repair material for cross-section repair of concrete structure in Korean Patent Registration No. 0875589, and cross-section repair method of concrete structure using the same, but in the case of the above patents, this As the liquid oil-soluble polyurea composition is coated using special equipment such as high-pressure spray equipment exclusively for polyurea, the construction method is complicated and there are problems of environmental contamination by organic solvents.

On the other hand, coating agents using inorganic resins such as silica sol have excellent properties such as heat resistance and high hardness, but the coating agent properties are too brittle and have poor mechanical properties. In addition, in the case of coatings using organic resins, the flexibility and adhesion of the coating are excellent. Among them, epoxy resins have chemical resistance, electrical insulation, and moldability. There is great concern.

Therefore, when such an inorganic resin or organic resin is used as a coating agent for top coating exposed to the external environment, there is a problem in that physical properties or chemical properties are deteriorated due to each disadvantage.

Republic of Korea Patent No. 10-1740239

In order to solve the above problems, an object of the present invention is to provide an eco-friendly coating agent with excellent neutralization and salt damage prevention functions and excellent heat shielding function.

Another object of the present invention is to provide a method for manufacturing an eco-friendly coating agent for protecting concrete and steel structures containing the eco-friendly hybrid resin.

In order to achieve the object of the present invention, the present invention,

A primer comprising 25 to 75 parts by weight of an alkaline aqueous solution, 25 to 75 parts by weight of an extender pigment, 5 to 30 parts by weight of a pigment, 20 to 75 parts by weight of water, and 6 to 15 parts by weight of an additive based on 100 parts by weight of an aqueous polymer resin;

A top coat containing 45 to 55 parts by weight of water-based polymer resin, 20 to 30 parts by weight of a heat-shielding pigment, 10 to 45 parts by weight of a functional filler, 20 to 40 parts by weight of water, and 3 to 6 parts by weight of an additive based on 100 parts by weight of the eco-friendly hybrid resin; including,

The water-based polymer resin includes at least one selected from water-based polyurea resin, water-based acrylic resin, water-based epoxy resin, and water-based EVA resin,

The eco-friendly hybrid resin contains 100 to 180 parts by weight of inorganic resin, 20 to 70 parts by weight of isocyanate prepolymer, and 5 to 10 parts by weight of dimethylol butaionic acid (DMBA) or dimethylol propionic acid (DMPA) based on 100 parts by weight of polyether amine. parts by weight, 5 to 10 parts by weight of chain extender, 1 to 5 parts by weight of TEA (Triethylamine), 350 to 500 parts by weight of water,

The extender pigment of the undercoat includes at least one selected from talc, hard carbon, heavy carbon, silicon-based filler, zinc phosphate, zinc dust, barium sulfate, and aluminum hydroxide,

The heat-shielding pigment is excellent in neutralization and anti-salt damage and has a heat-shielding function, characterized by mixing rutile-type titanium dioxide (rutile TiO2) and anatase-type titanium dioxide (anatase TiO ₂ ) in a weight ratio of 1 to 2: 1, respectively. Provides an excellent eco-friendly coating agent.

In order to achieve the above other object, the present invention includes a first step of synthesizing an eco-friendly hybrid resin;

a second step of mixing the synthesized hybrid resin with an aqueous polymer resin to form a mixture;

A third step of preparing a thermal barrier pigment by combining rutile-type titanium dioxide (rutile TiO ₂ ) pretreated with a metal compound, anatase-type titanium dioxide (anatase TiO ₂ ), and a special pigment for implementing color in the mixture formed above;

A fourth step of forming a mixture by mixing a functional filler with the blended thermal insulation pigment; and

As a method for producing an eco-friendly coating agent comprising a fifth step of adding and stirring a UV stabilizer, an adhesion promoter and an antifoaming agent to the mixture of the fourth step,

The heat-shielding pigment is a combination of rutile-type titanium dioxide (rutile TiO2) and anatase-type titanium dioxide (anatase TiO ₂ ) pretreated with a metal compound in a weight ratio of 1 to 2: 1, respectively, and using special pigments for color implementation It provides a method for producing an eco-friendly coating agent having excellent neutralization and salt damage prevention functions and excellent heat shielding function.

In order to achieve the above another object, the present invention,

After removing foreign substances on the surface of the concrete or steel structure, the eco-friendly coating agent according to the present invention is provided with a construction method of coating the surface of the concrete or steel structure using one or more selected from rollers, brushes and sprays.

The present invention provides an eco-friendly heat-shielding paint composition for protecting concrete and steel structures containing an eco-friendly hybrid resin, a pigment having a heat-shielding function, and a functional filler, which is more environmentally friendly than conventional paints using general polyurea resins, and has a heat-shielding function and deterioration of structures. It has the effect of imparting a preventive function. A coating film formed of such a paint has an excellent solar heat reflection effect and a low thermal conductivity, and has an excellent insulation effect.

Accordingly, it can be used as a coating agent that can save energy and increase the long-term durability of structures by controlling the internal temperature of buildings made of concrete and steel structures.

Hereinafter, the present invention will be described in more detail.

The present invention provides an eco-friendly coating agent for protecting concrete and steel structures including an eco-friendly hybrid resin, a heat-insulating pigment and a functional filler.

According to one aspect of the present invention, 25 to 75 parts by weight of an alkaline aqueous solution, 25 to 75 parts by weight of an extender pigment, 5 to 30 parts by weight of a pigment, 20 to 75 parts by weight of water, and 6 to 15 parts by weight of an additive, based on 100 parts by weight of an aqueous polymer resin. the underpass containing wealth; Water-based polymer resin based on 100 parts by weight of eco-friendly hybrid resin 45 to 55 parts by weight, 20 to 30 parts by weight of heat-shielding pigment, 10 to 45 parts by weight of functional filler, 20 to 40 parts by weight of water, and 3 to 6 parts by weight of additives;

The water-based polymer resin preferably includes at least one selected from water-based polyurea resin, water-based acrylic resin, water-based epoxy resin, and water-based EVA resin.

Eco-friendly hybrid resin, 100 to 180 parts by weight of inorganic resin, 20 to 70 parts by weight of isocyanate prepolymer, 5 to 10 parts by weight of DMBA (dimethylol butaionic acid) or DMPA (dimethylol propionic acid) based on 100 parts by weight of polyether amine 5 to 10 parts by weight of a chain extender, 1 to 5 parts by weight of TEA (Triethylamine), and 350 to 500 parts by weight of water.

The heat-shielding pigment preferably contains rutile-type titanium dioxide (rutile TiO2) and anatase-type titanium dioxide (anatase TiO ₂ ) in a weight ratio of 1 to 2:1, respectively. When the ratio of rutile TiO2 and anatase TiO ₂ is less than 1:1 or greater than 2:1, respectively, excellent heat shielding function is not obtained, which is not preferable.

As one composition of the top coat, the water-based polymer resin is used to express the impact resistance and crack resistance of the top coat, and one or more raw materials of water-based polyurea resin, water-based polyurethane resin, and water-based acrylic resin may be mixed and used.

When the water-based polymer resin is added below the above mixing range, the functions listed above may be deteriorated, and when the above mixing range is exceeded, a solid and airtight top coat can be obtained as the mixing amount of other components is relatively small. There is a problem that cannot be

The aqueous polyurea resin includes 15 to 75 parts by weight of amine terminated epoxy prepolymer (ATEP), 15 to 60 parts by weight of aliphatic isocyanate, dimethylol butaionic acid (DMBA) or DMPA, based on 100 parts by weight of polyether amine. (dimethylol propionic acid) 1 to 5 parts by weight, chain extender 1 to 3 parts by weight, TEA (triethylamine) 1 to 5 parts by weight, and water 100 to 600 parts by weight.

The polyurea resin is a resin having excellent chemical properties such as water resistance, chemical resistance, and salt water resistance and mechanical properties such as abrasion resistance and impact resistance, and the water-based polyurea resin is water-based and has environmentally friendly properties harmless to the human body.

Polyurea is a high molecular compound having a urea bond in its molecular structure, and is synthesized with diamines having a chain extender and low molecular weight to form a urea unit. Therefore, the properties of polyurea vary widely depending on various factors such as selected materials, molecular weight, and reaction ratio. In particular, in the case of polyurea, since amide ester bonds of fatty acids have mixed bonds, properties at high temperatures are intermediate between those of polyester and polyamide.

Polyether amine (Polyehter Amine) is a raw material that affects the basic physical properties of the resin, and preferably has a weight average molecular weight of 1,000 to 5,000. If the weight average molecular weight of polyetheramine is less than 1,000, physical properties such as impact strength, tear strength, environmental stress crack resistance, and elongation may deteriorate. If the weight average molecular weight of polyetheramine exceeds 5,000, Physical properties as described above are improved, but tensile force and synthesis yield may be reduced.

ATEP (Amine Terminated Epoxy Prepolymer) is a raw material that functions to improve the strength and toughness of the coating film. If ATEP is included in less than 15 parts by weight, the tensile strength and adhesion to the adherend may decrease. If it is included in an amount exceeding 75 parts by weight, the strength and tensile strength of the resin are excessively high, making it easy to break easily, so resistance to cracking may be reduced.

Aliphatic isocyanate is selected from one or more selected from 1,6-hexane diisocyanate (HDI), isophorone diisocyanate (IPDI), and methylene bis (p-cyclohexyl isocyanate) (H12MDI). It is preferable to use When an aliphatic isocyanate is included in less than 15 parts by weight, the viscosity of the resin increases and mechanical properties may deteriorate, and when it is included in an amount exceeding 60 parts by weight, the viscosity of the resin decreases. For this purpose, it is preferable to add within the range of 15 to 60 parts by weight.

DMBA (Dimethylol Butaionic Acid) or DMPA (Dimethylol Propionic Acid) is an ionic functional group (Ionic Center) imparting agent. Alternatively, when DMPA exceeds the range defined above, water resistance may be deteriorated.

TEA (Triethylamine) may be included in the resin for neutralization necessary for aqueous conversion of the resin, and may be appropriately used in proportion to the amount of DMBA or DMPA. When TEA is less than the above-limited range, dispersibility may deteriorate due to aqueous conversion, and when TEA exceeds the above-limited range, odors due to unreacted components after aqueous conversion may occur. there is.

Chain Extender is a chain extender of diamine monomers, and when the chain extender is less than the above-limited range, there is a concern that the crosslinking effect of chain extender is reduced, and the chain extender is within the above-limited range If it exceeds, the hardness and tensile strength of the resin may be excessively high. As the chain extender, it is preferable to use at least one selected from isophorone diamine (IPDA) and ethylene diamine (EDA).

Water can act as a solvent in the process of water-forming the resin, and distilled water is preferably used. When the mixing amount of water is less than the above-limited range, it is difficult to make the polyurea resin water-soluble, and when the water-mixing amount exceeds the above-limited range, there is no significant effect on water-ization, but the solid content of the final product is lowered, resulting in the decrease of the cured coating film. can affect physical properties.

The alkaline aqueous solution of the undercoat is an alkaline aqueous solution of pH 11 to 12, which imparts alkalinity to the penetration coating and strengthens the surface, has excellent water resistance and heat resistance, and acts to prevent concrete corrosion. When the alkaline aqueous solution is less than the above-limited range, the functions listed above may deteriorate, and when the mixed amount of the alkaline aqueous solution exceeds the above-limited range, the mixing amount of other components is relatively high. As this decreases, there is a risk that a solid and watertight coating film may not be formed on the concrete surface. Therefore, the alkaline aqueous solution is preferably adjusted to pH 11-12 by dissolving lithium silicate in water.

The pigment is for imparting color to the coating agent.

The extender pigment of the lower coat is selected from talc, hard carbon, heavy carbon, silicon-based filler, zinc phosphate, zinc powder, barium sulfate, and aluminum hydroxide, and one or more selected from among them, and the functional filler of the top coat is alumino silicate and calcium carbonate. , It is preferable to select and use one or more selected from among barium sulfate, bentone, aluminum hydroxide and mica.

The extender pigment serves to provide functions such as strength reinforcement and dimensional stability of the paint, and if the mixing amount of the extender pigment is less than the range defined above, there is a possibility that the above functions may be deteriorated, and the mixing amount of the extender pigment If it exceeds the above-limited range, there is a concern that workability and crack resistance performance may deteriorate due to an increase in viscosity.

The functional filler of the top coat preferably contains 10 to 45 parts by weight, more preferably 10 to 30 parts by weight. If the mixing amount is less than the above-limited range, functions such as strength, dimensional stability, heat insulation performance, abrasion resistance, and thixotropy may be deteriorated, and if it exceeds the above-limited range, adhesive strength and workability may be deteriorated. can

Alumino silicate imparts heat and heat insulation effects in the eco-friendly coating composition of the present invention, and ceramic-based powder is used.

Calcium carbonate is a white powder produced by the meeting of carbonate ions and calcium ions, and is also called lime carbonate. Barium sulfate is granular, bulky, and fibrous, and is called barite in nature. It is manufactured in the form of fine molecules by processing barite. It has the effect of improving pigment color development, surface gloss, or orientation of pigments used in metallic paints, so it can be used in architectural paints. can Benton is an abbreviation for bentonite, which is a kind of adsorbent clay generally refined from volcanic ash, and can be used as a building material due to its high absorbency.

Aluminum hydroxide is an amphoteric oxide of aluminum. It reacts with alkali to form aluminate salts, and reacts with acids to form salts. Among them, dry fine powder can be used for construction purposes. When dehydrated, it can absorb a large amount of heat, so it is preferable to use it as a filler for building thermal insulation paint.

Mica is a layered silicate mineral that has two layers formed by connecting tetrahedrons of oxygen with silicon or aluminum at the center and interspersed with a layer of iron or magnesium with iron or magnesium at the center. It is effective and has a light specific gravity, so it can be used for architectural paints.

The adhesion enhancer serves to reinforce the adhesion to the material through a chemical action on the binder and components by improving the viscosity, and when the amount of the adhesion enhancer is less than the range defined above, the adhesion between the undercoating composition and the base surface. If the addition amount of the adhesion promoter exceeds the range defined above, the adhesion between the coating composition and the base surface is no longer significantly improved and there is a risk of deteriorating other physical properties of the undercoating composition. Disteadymonium hectorite may be preferably used as the adhesion promoter.

Heat-shielding paint prevents surface temperature from rising with its high reflectance for sunlight in the near-infrared region, which is the main cause of temperature rise, while preventing heat conduction to objects by applying hollow spheres in the coating film, fundamentally Blocks and relieves accumulation. It is an eco-friendly Energy Saving Coating System that lowers the conductivity of heat generated by sunlight by coating the exterior of a building, metal, asphalt, glass, etc. to prevent an increase in internal temperature and reduce cooling costs.

The heat-shielding pigment effectively reflects infrared rays having high energy among enhanced solar rays and has excellent weather resistance. The heat-shielding pigment made of silica cells can block free radical emission, improve durability and improve UV attenuation, and has excellent dispersing power when coated with alumina. In addition, when rutile-type titanium dioxide (rutile TiO ₂ ) is used, weather resistance, hiding power, solar reflectance and UV absorption can be improved, and deterioration of physical properties can be prevented.

It is preferable to use at least one selected from among rutile-type titanium dioxide (rutile TiO ₂ ), anatase-type titanium dioxide (anatase TiO ₂ ), and special pigments having high reflectance in the infrared region as the heat-shielding pigment.

In addition, it is preferable to include 20 to 30 parts by weight of the heat-shielding pigment. When the amount of the heat-shielding pigment is less than 20 parts by weight, the hiding rate and heat-shielding effect may decrease, and when it exceeds 30 parts by weight, the content of other compositions is relatively low, making it difficult to obtain the composition of the present patent, which is not preferable.

The additives of the undercoat include 2 to 5 parts by weight of a wet dispersant, 2 to 5 parts by weight of an antifoaming agent, and 2 to 5 parts by weight of an adhesion promoter, and the additives of the top coat include 1 to 2 parts by weight of a UV stabilizer, 1 to 2 parts by weight of an adhesion promoter, 1 to 2 parts by weight of the antifoaming agent may be included.

Antifoaming agent enhances adhesion by improving the wettability of the paint and removes air bubbles in the top and bottom coating compositions to improve the aesthetics of the appearance and the denseness of the coating film to enhance durability. In this case, there is a concern that the bubble removal effect of the upper and lower coating compositions may decrease, and if the amount of the antifoam agent added exceeds the range defined above, the defoaming effect is no longer significantly improved and other physical properties of the paint may be deteriorated. There are concerns.

The UV stabilizer has a light blocking and dispersing function, and acts to effectively improve light safety. The UV stabilizer is at least one selected from benzotriazole and HALS (Hindered Amine Light Stabilizer).

When the surface of a paint containing a polyurea resin is exposed to ultraviolet light as it is, the chain of urea may be broken, and as a result, active radicals may be generated and the paint may be oxidized. The UV stabilizer HALS of the present invention is an additive for preventing oxidation, and when the surface of the paint receives ultraviolet rays to break the urea chain and generate active radicals, the UV stabilizer can act as a kind of antioxidant that directly removes active radicals. . Due to these properties, the UV stabilizer of the present invention can be used as an antioxidant additive for all general-purpose paints with excellent accelerated weathering. In the case of benzotriazole, 2-(2'-Hydroxy-5'-methylphenyl)benzotriazole can be used, and as an ultraviolet absorber that absorbs UV energy and converts it into heat energy, the effect as a UV stabilizer is further increased when used in combination with HALS can do.

In the present invention, when the amount of the UV stabilizer is less than 1 part by weight, the effect of preventing premature deterioration may decrease, and when the amount exceeds 2 parts by weight, the effect of preventing premature deterioration is no longer improved, and other physical properties of the coating composition may be deteriorated.

Isocyanate prepolymer is an aliphatic isocyanate, and is selected from 1,6-hexane diisocyanate (HDI), isophorone diisocyanate (IPDI), and methylenebis (p-cyclohexyl isocyanate) (H12MDI); or It is preferable to select and use more than that.

According to another aspect of the present invention, a first step of synthesizing an eco-friendly hybrid resin; a second step of mixing the synthesized hybrid resin with an aqueous polymer resin to form a mixture; A third step of preparing a thermal barrier pigment by combining rutile-type titanium dioxide (rutile TiO ₂ ) pretreated with a metal compound, anatase-type titanium dioxide (anatase TiO ₂ ), and a special pigment for implementing color in the mixture formed above; A fourth step of forming a mixture by mixing a functional filler with the heat-insulating pigment; And a fifth step of adding and stirring a UV stabilizer, an adhesion promoter, and an antifoaming agent to the mixture of the fourth step, wherein the heat-shielding pigment is rutile-type titanium dioxide pretreated with a metal compound (rutile TiO2) and anatase-type titanium dioxide (anatase TiO ₂ ) in a weight ratio of 1 to 2: 1, respectively, and using special pigments for color implementation. A coating agent manufacturing method is provided.

The eco-friendly hybrid resin of the first step is 100 to 180 parts by weight of inorganic resin, 20 to 70 parts by weight of isocyanate prepolymer, DMBA (dimethylol butaionic acid) or DMPA (dimethylol propionic acid) based on 100 parts by weight of polyether amine 5 to 10 parts by weight, 5 to 10 parts by weight of a chain extender, 1 to 5 parts by weight of TEA (Triethylamine), and 350 to 500 parts by weight of water.

Eco-friendly hybrid resin has excellent weather resistance, stain resistance (Anti-Graffiti), and abrasion resistance, and has excellent physical properties such as toughness, tensile strength, and elongation, and provides characteristics such as heat resistance, oil resistance, water resistance, chemical stability, and low surface energy. It functions as a subject to do, and it is characterized by excellent adhesiveness with various elements.

Polyether amine is a raw material that affects resin properties, and determines basic properties and reactivity. Polyether amine preferably has a weight average molecular weight of 2,000 to 3,000. If the weight average molecular weight of polyether amine is less than 2,000, physical properties such as impact strength, tear strength, environmental stress crack resistance, and elongation may be deteriorated. If the weight average molecular weight of polyether amine exceeds 3,000, impact strength , physical properties such as tear strength, environmental stress cracking resistance, and elongation are improved, but there is a concern that tensile strength and synthetic yield may decrease.

Inorganic resin is a reactive resin that has a hydorxylic group at the end and has a fluorine and silicon bond. It improves heat resistance and weather resistance, chemical stability, stain resistance (anti-graffiti), and forms excellent scratch resistance and smooth surfaces due to low surface energy. . It is preferable to use a resin having a weight average molecular weight of 1,000 to 4,000.

Isocyanate Prepolymer is an aliphatic isocyanate by mixing one or more of 1,6-hexane diisocyanate (HDI), isophorone diisocyanate (IPDI), and methylene bis (p-cyclohexyl isocyanate) (H12MDI). and can be used.

If the isocyanate prepolymer is less than 20 parts by weight, there is a problem that the viscosity of the resin is increased and mechanical properties are lowered, and if it exceeds 70 parts by weight, the adhesive strength and tensile strength are increased, but the resin viscosity is lowered.

According to another aspect of the present invention, after removing foreign substances on the surface of a concrete or steel structure, the eco-friendly coating agent is used to coat the surface of the concrete or steel structure using at least one selected from a roller, brush, and spray to provide a method for construction. do.

At this time, since the above-mentioned antifoaming agent, dispersing agent, thickening agent and antifreezing agent can use components commonly used by those skilled in the art, any known ones may be used as long as they meet the purpose of the present invention. free

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. However, these examples are intended to explain the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited thereto.

<Example>

<Preparation Example 1- Eco-Friendly Hybrid Resin Synthesis>

To obtain the eco-friendly coating agent of the present invention, an eco-friendly hybrid resin was synthesized. Polyetheramine having a weight average molecular weight of 2,000, functional perfluoropolyether resin, which is an inorganic resin, and hydroxyl terminated functional silicone are added to a reaction vessel, and isocyanate prepolymer is prepared while stirring at room temperature. It is slowly dropped, added dropwise for 1 to 2 hours, and stirred for 30 minutes. After the temperature of the resin was raised to 80° C., DMBA was added and sufficiently stirred for 3 hours under a catalyst to ionize the resin. MEK (Methyl Ethyl Ketone) is added to adjust the viscosity during the synthesis process. After dissolving the resin in MEK (Methyl Ethyl Ketone) while maintaining the temperature below 40 ° C, chain extension by slowly adding IPDA (Isophorone Diamine), a chain extender, dropwise proceeded. After stirring for 3 hours, disappearance of the isocyanate group was confirmed by IR, and MEK (Methyl Ethyl Ketone) dissolved in TEA (Triethylamine) was added dropwise and stirred for 30 minutes to neutralize. Water was added dropwise while stirring the reactant in the reaction vessel at high speed to make it aqueous, and then MEK (Methyl Ethyl Ketone) was removed by distillation under reduced pressure to obtain an eco-friendly hybrid resin.

<Example 1>

100 g of the eco-friendly hybrid resin according to Manufacturing Example 1 was mixed with 50 g of aqueous polyurea resin, rutile-type titanium dioxide and anatase-type titanium dioxide in a 1: 1 ratio, and 26 g of heat-insulating pigment containing special pigments, 25 g of functional filler, 30 g of water, and UV stabilizer A top coat containing 1.5 g, 1 g of adhesion promoter and 1 g of antifoam was prepared.

<Example 2>

48 g of aqueous polyurea resin, rutile-type titanium dioxide and anatase-type titanium dioxide were mixed in a 1: 1 ratio with 100 g of the eco-friendly hybrid resin according to Preparation Example 1, and 28 g of heat-insulating pigment containing special pigments, 23 g of functional filler, 30 g of water, and UV stabilizer A top coat containing 1.5 g, 1 g of adhesion promoter and 1 g of antifoam was prepared.

<Comparative Example 1>

100 g of the eco-friendly hybrid resin according to Preparation Example 1 was mixed with 51 g of aqueous polyurea resin, rutile-type titanium dioxide and anatase-type titanium dioxide in a ratio of 1:2, and 23 g of heat-insulating pigment containing special pigments, 24 g of functional filler, 30 g of water, and UV stabilizer A top coat containing 1.5 g, 1 g of adhesion promoter and 1 g of antifoam was prepared.

<Comparative Example 2>

100 g of the eco-friendly hybrid resin according to Preparation Example 1 was mixed with 58 g of aqueous polyurea resin, rutile-type titanium dioxide and anatase-type titanium dioxide in a 1: 1 ratio, and 26 g of heat-insulating pigment containing special pigments, 22 g of functional filler, 30 g of water, and UV stabilizer A top coat containing 1.5 g, 1 g of adhesion promoter and 1 g of antifoam was prepared.

The contents of the materials used in Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1 below:

division Example comparative example One 2 One 2 Eco-friendly hybrid resin 100 100 100 100 water-based polymer resin 50 48 51 58 heat shielding pigment Rutile Titanium Dioxide 12 13 7 12 Anatase-type titanium dioxide 12 13 14 12 special pigment 2 2 2 2 functional filler 25 23 24 22 water 30 30 30 30 additive uv stabilizer 1.5 1.5 1.5 1.5 antifoam 1.0 1.0 1.0 1.0 adhesion promoter 1.0 1.0 1.0 1.0

Results and evaluation

The results were evaluated using the eco-friendly coating agents according to Examples 1 and 2 and Comparative Examples 1 and 2, and are shown in Table 2:

Test Items Example comparative example Quality standards Test Methods One 2 One 2 Depth of neutralization (mm) ⊙ ⊙ ⊙ X below 1.0 KS F 4936 Chloride ion permeation resistance (Coulombs) ⊙ ⊙ ⊙ X less than 1000 KS F 4936 Near-infrared reflectance (%) ⊙ ⊙ X ⊙ High brightness area (L ^* value of 80 or more) over 80 SPS-KPIC 5020-7316 ⊙ : Satisfied above the quality standard, X : Below the quality standard

Through Examples 1 and 2, when rutile-type titanium dioxide and anatase-type titanium dioxide were mixed at a weight ratio of 1: 1, it was confirmed that the neutralization depth, chloride ion penetration resistance, and near-infrared reflectance exceeded the quality standards.

In Comparative Example 1, the ratio of rutile-type titanium dioxide and anatase-type titanium dioxide content was mixed at a weight ratio of 1: 2, and the near-infrared reflectance (L ^* value) was 80 or less in the high brightness region, confirming that it was below the quality standard. .

Comparative Example 2 was tested by mixing the contents of rutile-type titanium dioxide and anatase-type titanium dioxide at a weight ratio of 1:1, but it was confirmed that the neutralization depth and chloride ion permeation resistance were below the quality standard because the water-based polymer resin was out of the mixing range. could

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the scope of the invention which follows may be better understood. Those skilled in the art to which the present invention pertains will understand that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the claims and equivalent concepts should be construed as being included in the scope of the present invention.

Claims (6)

25 to 75 parts by weight of alkaline aqueous solution, 25 to 75 parts by weight of extender pigment, 5 to 30 parts by weight of pigment, 20 to 75 parts by weight of water, 2 to 5 parts by weight of a wetting dispersant, 2 to 5 antifoaming agents, based on 100 parts by weight of aqueous polymer resin A lower coating comprising 2 to 5 parts by weight of an adhesion promoter;
Based on 100 parts by weight of eco-friendly hybrid resin, 48 to 50 parts by weight of water-based polymer resin, 26 to 28 parts by weight of heat shielding pigment, 10 to 30 parts by weight of functional filler, 20 to 40 parts by weight of water, 1 to 2 parts by weight of UV stabilizer, adhesion promoter A top coat containing 1 to 2 parts by weight and 1 to 2 parts by weight of an antifoaming agent;
The water-based polymer resin includes at least one selected from water-based polyurea resin, water-based acrylic resin, water-based epoxy resin, and water-based EVA resin,
The eco-friendly hybrid resin contains 100 to 180 parts by weight of inorganic resin, 20 to 70 parts by weight of isocyanate prepolymer, and 5 to 10 parts by weight of dimethylol butaionic acid (DMBA) or dimethylol propionic acid (DMPA) based on 100 parts by weight of polyether amine. parts by weight, 5 to 10 parts by weight of chain extender, 1 to 5 parts by weight of TEA (Triethylamine), 350 to 500 parts by weight of water,
The extender pigment of the undercoat includes at least one selected from talc, hard carbon, heavy carbon, silicon-based filler, zinc phosphate, zinc dust, barium sulfate, and aluminum hydroxide,
The functional filler of the top coat includes at least one selected from alumino silicate, calcium carbonate, barium sulfate, bentone, aluminum hydroxide, and mica,
The heat-shielding pigment of the top coat is a mixture of rutile-type titanium dioxide (rutile TiO2) and anatase-type titanium dioxide (anatase TiO ₂ ) in a weight ratio of 1: 1, respectively,
An eco-friendly coating agent with excellent neutralization and salt damage prevention functions and excellent heat shielding function, characterized by a near-infrared reflectance of 80% or more.
According to claim 1,
The aqueous polyurea resin includes 15 to 75 parts by weight of amine terminated epoxy prepolymer (ATEP), 15 to 60 parts by weight of aliphatic isocyanate, dimethylol butaionic acid (DMBA), or 1 to 5 parts by weight of DMPA (dimethylol propionic acid), 1 to 3 parts by weight of chain extender, 1 to 5 parts by weight of TEA (triethylamine), and 100 to 600 parts by weight of water. Eco-friendly coating agent with excellent heat shielding function.
After removing foreign substances on the surface of the concrete or steel structure, the environmentally friendly coating agent according to any one of claims 1 or 2 is coated on the surface of the concrete or steel structure using one or more selected from rollers, brushes and sprays.
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