KR100867682B1 - Eco-heavy duty coating system with high weatherability a method for preventing contamination - Google Patents

Abstract

An environment-friendly aqueous paint composition is provided to ensure environment-friendly property by not using an emulsifier, excellent anticorrosion by containing a metal filler with electric conductivity. An environment-friendly aqueous paint composition comprises 28-89 weight% of room temperature cross-linking type aqueous acrylic resin which forms a complex by hydrogen-bonding zinc oxide or zirconium oxide with a carboxyl group of a acrylic resin; 1-70 weight% of a conductive filler which is a mixture or two kinds or more of mixture selected from a carbon nanotube, copper, nickel, conductive carbon dioxide and silver; 1-5 weight% of a dispersing agent with one or more selected from alkylsulfonate, sulfonate oil, alkyl ether and polyoxyethylene; and 1-5 weight% of additives with two kinds or more selected from methylcellulose, ethyl cellulose, polyacrylate, silicon-based antifoaming agent, isothiazoline derivative and butylene oxide.

Description

Eco-heavy duty coating system with high weatherability A method for preventing contamination

The present invention relates to an environmentally friendly aqueous coating composition, and more particularly, to an aqueous coating composition which is excellent in anticorrosive effect because it contains a metal filler which is environmentally friendly and has high electrical conductivity because it does not include an emulsifier. In addition, the present invention relates to a super-heavy anticorrosion, ultra-weatherproof anticorrosion method of the steel structure or concrete structure using the coating composition.

Paint is applied to an object to form a film and to protect the object from contamination or corrosion. However, organic solvents contained in the paint can be absorbed into the human body through respiratory or skin contact, and acts as a threat to health by affecting the central nervous system. Until recently, many epidemiologic studies have suggested that chronic exposure to organic solvents can lead to central nervous system disorders. In particular, workers who handle organic solvents directly in confined spaces are always unprotected from choking or fire hazards. Even if you are not a direct worker, you can be indirectly affected by air pollution from volatile organics. Accordingly, interest in the regulation of VOCs is increasing internationally, and there is an increasing demand for the development of environmentally friendly paints such as oil paints and powders.

In addition, recently, various additives have been added to give special functions such as heat resistance, weather resistance, heat stability, and rust resistance to paints. When forming a coating film on ferrous metals, anti-corrosive pigments containing heavy metals such as chromium and lead are used, which are also required to be absorbed by the human body through the respiratory or skin. Therefore, there is a need to develop an eco-friendly coating composition that does not contain heavy metals or has a specific level of rust prevention ability even without undergoing a special pretreatment, that is, zinc phosphate or iron phosphate coating process.

In the coating composition of the environmentally-friendly material as described above, when it leads to the coating of the system in addition to the corrosion protection of the metal should be considered together with the various bases and the adhesion of the various top coats.

Zinc paint, which is currently used as an rust preventive paint, loses rust effect or poor adhesion after a certain period of time such as zinc dust is corroded by oxygen or moisture to cause white rust. In addition, when used as a primer on steel structures, such as steel bridges, the coating film thickness should be thick, and the resin is less desirable for steel bridge specifications that maintain high weather resistance, such as peeling off the coating film easily due to external impact.

In addition, chlorinated rubber paints, which are widely used in heavy-duty coatings, are excellent in fast drying and layer adhesion, and are resistant to pollution and coastal environments. In particular, rubber chloride paint is superior to other paints due to its excellent coating properties, which is advantageous for painting steel structures such as containers and ships. However, the chlorinated rubber paint has a disadvantage of deteriorating the appearance of the steel structure after a certain period of time after painting due to poor weather resistance.

In order to improve the above problems, modified forms of various types of polyamine compounds are used. Representative modification methods include a modification of a phenol group and a carbonyl compound by reaction with a phenol compound and a reaction with an epoxy compound, and a carboxyl group. Modification by reaction with a compound having, modification by Mikel reaction with an acrylic compound, and the like are disclosed in Japanese Patent Laid-Open No. 8-104738. However, the modified curing agent can obtain satisfactory physical properties in the temperature range of 20 ℃ to 40 ℃, but the coating film is not sufficiently cured at 10 ℃ or less, especially 5 ℃ or less, to the Mannich reaction used as a conventional low-temperature curing resin The modified product by this also does not fully harden a coating film.

In order to solve the above problems, the present invention, unlike a useful paint containing a heavy metal and a large amount of volatile organic compounds, does not contain any heavy metals that are harmful to the human body and prevents the exposure of unprotected volatile organic compounds in the workplace. It provides an environmentally friendly water-based coating composition that can be safely painted even in a closed space. In addition, the present invention provides an aqueous coating composition having excellent anti-rust effect by adding a conductive filler to the aqueous coating composition. Finally, the present invention provides a super-medium-type anti-weather resistance method using the coating composition.

The present invention is 28 to 89% by weight of a room temperature cross-linkable aqueous acrylic resin formed complex with zinc oxide or zirconium oxide; 1 to 70 wt% conductive filler; 1 to 5 weight percent dispersant; It provides an environmentally friendly aqueous coating composition consisting of; 1 to 5% by weight of other additives.

The amount of zinc oxide or zirconium oxide complexed with the room temperature crosslinkable aqueous acrylic resin is 0.15 to 3% by weight based on 100% by weight of the acrylic resin.

The conductive filler is one or a mixture of two or more selected from carbon nanotubes, copper, nickel, conductive carbon dioxide and silver.

The dispersant uses at least one selected from alkylsulfonates, sulfonate oils, alkyl ethers and polyoxyethylene systems.

In addition, the other additives use two or more selected from methyl cellulose, ethyl cellulose, polyacrylate, silicone antifoaming agent, isothiazoline derivative, and butylene oxide.

In the present invention, the surface treatment step of removing the deteriorated portion or foreign matter on the surface of the concrete structure or steel structure; Applying the paint composition to a surface of the treated structure; Provides eco-friendly ultra-medium- and ultra-climate weatherproof method including a. The anticorrosive method may further include adding an inorganic pigment, an organic pigment, or a sunscreen agent to the coating composition and applying the same.

In addition, the anticorrosive method of the present invention further forms a coating film for preventing contamination by using an antifouling paint or a silicone rubber antifouling paint containing a titanium oxide fine particle or a titanium oxide sol, and a polymerizable copolymer containing an unsaturated carboxylic acid silyl ester component. It may include a step.

Since the aqueous coating composition of the present invention does not contain volatile organic compounds including heavy metals, it does not harm workers' health, and pollution of the surrounding environment, including the workplace, does not occur. In addition, the water-based coating composition is strongly adhered to the iron and concrete structures to block moisture and oxygen, so it is excellent in rust resistance, water resistance, moisture resistance, adhesion strength, elongation and the like. Therefore, the ultra-medium- and anti-weather resistance method using the water-based coating composition of the present invention is excellent in weatherability and gloss, so durability is maintained for a long time, so no additional maintenance is required.

The present invention provides an environmentally friendly water-based coating composition and an environmentally friendly super middle and high weather resistance method using the same.

Environmentally friendly water-based coating composition of the present invention is 28 to 89 parts by weight of a metal complex room temperature cross-linking aqueous acrylic resin; 1 to 70 parts by weight of the conductive filler; 1 to 5 parts by weight of dispersant and 1 to 5 parts by weight of other additives.

In the metal complexed acrylic resin, a metal oxide such as zinc oxide or zirconium oxide forms a hydrogen bond with a carboxyl group of the acrylic resin, and the metal oxide plays a role of providing rust resistance to the synthetic resin.

The metal complexed acrylic resin is used as a binder of the eco-friendly water-based paint composition of the present invention to block the movement and penetration of moisture and to increase the adhesion of the paint composition and the structure.

Complex formation of the acrylic resin and the metal oxide is preferably made in a ratio of 0.15 to 3% by weight of the metal oxide relative to 100% by weight of the acrylic resin.

The acrylic resin is methacrylate, butyl methacrylate, hexyl methacrylate, octyl methacrylate, styrene, acrylic acid, methacrylic acid, glycidyl acrylate, glycidyl methacrylate, hydroxyethyl acrylate, It is preferable to copolymerize hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, and acetone acrylamide. The glass transition temperature of the monomer is 0 to 50 ° C, preferably 10 to 30 ° C.

The conductive filler is added for the rust prevention effect of the iron structure, and includes one or a mixture of two or more selected from carbon nanotubes, copper, nickel, conductive carbon dioxide and silver having excellent electrical conductivity. In recent years, sacrificial anodes using metal pigments such as Cu, Zn, Cr, and Ni, which have a rapid ionization tendency, have been used to give antirust effects. Since the electrical conductivity of the nanocarbon tube is about 100 times that of steel and about 1000 times that of copper, when used instead of the metal, the antirust effect by the sacrificial anode method is superior to other materials such as copper.

The dispersant is to uniformly disperse the conductive filler in the metal complexed acrylic resin. In this case, as the dispersant added, one or more anionic or nonionic dispersants such as alkylsulfonate, sulfonate oil, alkyl ether, and polyoxyethylene-based may be selected and added. The dispersant is preferably included in the paint composition at a rate of 1 to 5% by weight. If it is less than 1% by weight, it is impossible to achieve a uniform dispersion effect. If it is more than 5% by weight, the elongation of the coating film is reduced, thereby reducing the resistance to cracking of the concrete surface.

The other additives are added to ensure storage stability, workability, and the like, and include thickeners, preservatives or antifoaming agents. Specifically, 2 or more types are mixed and added in methyl cellulose, ethyl cellulose, a polyacrylate, a silicone type antifoamer, an isothiazoline derivative, and butylene oxide. The additive is preferably included in the paint composition in a ratio of 1 to 5% by weight. If less than 1% by weight, bubbles are generated in the slurry, making it difficult to secure a smooth coating surface, and when it is more than 5% by weight, workability is lowered.

The following describes in detail the method for producing the aqueous coating composition of the present invention.

The acrylic resin is prepared by copolymerizing the monomer, usually using a method of emulsion polymerization. First, an initiator, a reactive emulsifier, an acrylic copolymerizable monomer, and a hydrazine derivative are added to water, followed by heating and stirring to prepare an acrylic resin. In this case, each addition ratio is 40 to 60% by weight of water, 0.05 to 0.5% by weight of reactive emulsifier, 39.45 to 54.5% by weight of copolymerizable monomer and 0.5 to 5% by weight of hydrazine derivative.

The acryl-based copolymerizable monomer preferably contains 5 to 50% by weight, preferably 1 to 30% by weight of diacetone acrylamide, which acts as a crosslinking agent at room temperature, relative to 100% by weight of the total copolymerizable monomer.

In addition, 1 to 20% by weight, preferably 2 to 10% by weight of the copolymerizable monomer containing an acid such as acrylic acid or methacrylic acid relative to 100% by weight of the total copolymerizable monomer to form a metal complex with zinc oxide or zirconium oxide. It is preferable to add.

It is preferable to use the reactive emulsifier which contains an aryl group. In general, the coating composition containing a conventional emulsifier will remain emulsified after application. Such residual emulsified components may be a path of movement of water or moisture in a general aqueous coating film and may accelerate the rust. Therefore, it is preferable that the binder contained in the coating composition of this invention uses a reactive emulsifier, without using a normal emulsifier.

The hydrazine derivatives form a dense and tough coating film at room temperature with a diacetone acrylamide used as the copolymerizable monomer to form a dense and tough coating film to integrate iron structures and paints to improve solvent resistance, adhesion and water resistance, thereby accelerating rust. Blocks acids, alkalis, salts, etc.

The acrylic resin was prepared by mixing 55 to 85 wt% of ionized water, 5 to 15 wt% of metal oxides such as zirconium oxide or zinc oxide, 5 to 15 wt% of ammonia water, and 5 to 15 wt% of ammonium salt. It is added at a ratio of 3 to 20% by weight relative to 100% by weight. As the ammonium salt, various salts such as ammonium carbonate, ammonium bicarbonate, and ammonium bifluoride may be used, but ammonium bicarbonate is particularly preferable.

When the metal complex room temperature crosslinkable aqueous acrylic resin is prepared according to the above method, the conductive filler, the dispersant, and the other additives are added in the above amounts and stirred to prepare an environmentally friendly aqueous coating composition of the present invention.

As mentioned above, the manufacturing method of the eco-friendly water-based coating composition of this invention was demonstrated in detail. However, the manufacturing method is only one of the most preferred examples of the aqueous coating composition of the present invention, the aqueous coating composition of the present invention is not limited by the manufacturing method. That is, at the time of filing of the present invention, there may be various modified embodiments that can replace them.

As described above, the components, ratios, and manufacturing methods of the environmentally friendly aqueous coating composition of the present invention were described in detail. The ultra-heavy anticorrosion and ultra-weatherproof anticorrosion method of the present invention can be made using the above-mentioned affinity-based aqueous coating composition. Hereinafter will be described in detail with respect to the ultra- middle, ultra-high weather resistance method using the environmentally friendly water-based coating composition.

2. Elementary and Middle Method · Ultra Weatherproof Method

The eco-friendly super-medium-pressure method is a method of forming a coating film having excellent weather resistance and gloss protection retention in various industrial facilities and steel structures by using a paint mainly composed of a yellowing acrylic water-based urethane, and the coating film formed by the above method is weather resistant and As it has excellent high gloss and maintains durability for at least 20 years, it means an eco-friendly method without the need for additional repair.

In addition, the ultra-weather resistance method means an anticorrosive method using a paint based on the most sulfur-free aqueous binder having the highest crosslinking density and excellent stability among currently developed paints. The method is excellent in color and gloss retention, excellent weather resistance, water resistance, chemical resistance performance is maintained for a long period of more than 20 years.

The ultra-medium anti-corrosion and anti-corrosion anticorrosive method of the present invention is made using the aqueous coating composition described above. At this time, it is also possible to form the coating film of one layer by applying the coating composition once or depending on the outer surface state of the structure to be applied, or to form a multilayer coating film by applying two or more times. For example, the coating | coating twice which forms undercoat and upper coat, or the coating | coating which forms undercoat, intermediate | middle and top coat can be performed.

In addition, in order to additionally impart functions such as color tone, concentration, coloring power, hiding power, chemical resistance, toxicity, rust resistance, etc., an organic or inorganic pigment or an additive for blocking UV rays is added and mixed to the coating composition of the present invention. You can do that. In addition, it may further include an antifouling coating layer.

1 is a flowchart showing the working process of the super-medium method, ultra-weather resistance method according to an embodiment of the present invention. Hereinafter, the anticorrosive method was described in detail with reference to FIG. 1.

The most preferred embodiment of the super-medium method, ultra-weather resistance method using the water-based coating composition of the present invention is the step of forming a coat as a primer (S2), the step of forming the intermediate for the super-medium coating on the primer is applied ( S3), it may be made of a step (S4) to form a top coat for the ultra-weather resistance method on the upper surface is formed. In addition, it may further comprise a surface treatment step (S1) of the structure before forming the roadway. The surface treatment step may be appropriately selected and performed according to the high pressure washing (Water Jetting) or SSPC (Steel Structure Coatings Association) standard among the conventional methods performed by those skilled in the art. In addition, after forming the top coat may further comprise the step (S5) of applying an anti-fouling agent to prevent contamination of the coating film formed.

2.1 Formation of Sewerage (S2)

To form a primer as a primer on the surface of the surface-treated structure (S2). The primer may be used by diluting the aqueous coating composition of the present invention as a stock solution or by adding water of 30% by weight or less relative to 100% by weight of the coating composition for coating properties. After applying the primer, it should be cured for a sufficient time to dry completely. After the primer is completely cured, the thickness of the dry coating film is preferably 5 to 100 μm. If the thickness is less than 5 μm, the coating between the coating layer and the structure may be unstable when the super middle anticorrosive agent is applied in the subsequent step, and if the thickness is more than 100 μm, the coating film may be too thick, resulting in dropout of the coating film.

In order to effectively apply the anticorrosive method of the present invention, the surface treatment step (S1) may be performed before applying the primer. The surface treatment step is to remove the appearance fracture layer caused by aging phenomenon such as salt damage, neutralization (carbonation), chemical corrosion and bridge cracking due to structural load. The surface treatment is SSPC (The Society for Protective Coatings), SIS (Swedish Standards Institute), BS (British Standards Association, according to the state of the surface of the structure to which the anticorrosive method of the present invention is applied) It can be appropriately adopted by those skilled in the art, such as British Standards Institute) and NACE (National Association of Corrosion Engineers) standards.

2.2. Midway Formation for Sino-Medium Way (S3)

After the primer is completely dried to perform the step (S3) to form a medium for the ultra-middle method.

The intermediate may be used or diluted with the aqueous coating composition or the stock solution of the present invention. In addition, it is also possible to further use an organic or inorganic pigment or a sunscreen agent in order to additionally impart functions such as color tone, concentration, coloring power, hiding power, chemical resistance, toxicity, and rust resistance to the aqueous coating composition.

Alternatively, an organic or inorganic pigment or a sunscreen may be further added to the metal complexed room temperature crosslinkable aqueous acrylic resin. In addition, an appropriate amount of dispersant may be further added in order to disperse the pigment or the sunscreen well.

The pigment or additive may be appropriately selected by those skilled in the art according to the function to be applied to the coating film. For example, zinc phosphate or MIO (Micaceous iron oxide), which are inorganic special pigments, may be added alone or in combination for additional anti-rust effect. In addition, when an organic pigment is added, a sunscreen may be further added to prevent decomposition by ultraviolet rays. In the case of preparing a medium (eco-friendly super-middle anticorrosive), the addition ratio of the additive, such as the pigment, the sunscreen or the dispersant, which is additionally added, is 1% to 100% by weight of the eco-friendly coating composition in consideration of adhesion of the coating film. It can be used in the range of to 70% by weight, preferably in the range of 10 to 30% by weight. The dispersing agent and the additive may increase or decrease the addition ratio according to the amount of the pigment, preferably 0.5 to 3% by weight relative to the amount of the pigment. %, Functional additives such as sunscreen range from 0.1 to 3% by weight of the paint composition

The medium coating method may use a variety of methods and is not limited to a special method, but it is preferable to adopt a spray method to evenly coat a large-area structure. At the time of spraying, in order to facilitate application, water of 30% by weight or less relative to the total amount of the aqueous coating composition may be appropriately added and used.

After applying the intermediate degree for the super-medium method, it should be cured for a sufficient time to dry completely. After the curing is completely cured, the thickness of the dry coating film is preferably 50 to 500 µm. If the thickness is less than 50㎛ the bond of the coating film and the adhesion is unstable, if the thickness is more than 500㎛ coating film is formed thick may cause dropout.

2.3. Topology Formation for Ultra-Weatherproof Anticorrosive (S4)

After the intermediate degree is completely dried, the top coat is applied for an ultra-weather resistant method (S4). The top coat is a sunscreen for preventing decomposition by pigments or ultraviolet rays in order to impart additional functions such as color tone, concentration, coloring power, hiding power, chemical resistance, toxicity, and rust resistance to the crosslinkable affinity acrylic resin of the present invention. It can be used by adding more. In the anticorrosive method of the present invention, in the case of using the coating composition of the present invention as a top coat, it is preferable to use the crosslinkable eco-friendly acrylic resin as a main binder because color expression is difficult by the conductive material.

When the pigment or the sunscreen is added, an appropriate amount of the dispersant may be further added for the dispersion thereof. The pigment, additive or dispersant is added within the range of 1 to 70% by weight, preferably 10 to 30% by weight based on 100% by weight of the eco-friendly paint composition in consideration of the adhesion of the coating film and the like. The dispersant and the additive may increase or decrease the addition ratio according to the amount of pigment, preferably 0.5 to 3% by weight based on the amount of pigment, and the functional additive material such as the sunscreen agent is in the range of 0.1 to 3% by weight relative to the paint composition.

After the midway is completely dry, the top coat is applied. In order to effectively achieve the super weather resistance method, the top coat is preferably used as a stock solution without dilution. However, when applying evenly to a large area, it is preferable to use a spray method. In the case of the spray method, water may be diluted by adding up to 3% by weight of water with respect to 100% by weight of the top coat.

This step can be carried out in one part or in two parts by further mixing the curing agent. The curing agent used at this time is preferably a water-soluble isocyanate, but may be appropriately selected by those skilled in the art to which the present invention belongs. At this time, the curing agent is used in less than 20% by weight based on 100% by weight of the aqueous coating composition. It is preferable that the thickness of a dry coating film after application | coating of the said 3rd agent is 50 micrometers.

2.4. Application of anti-fouling coating agent (S5)

When the structure to which the anticorrosive method of the present invention is applied is installed outside the bridge, etc., the method may further include applying an antifouling coating agent after the top coat is completely dried. Anti-fouling coating agent can be applied by selecting a suitable technique by those skilled in the art. For example, a titanium oxide-based coating agent having photocatalytic activity can be used. When titanium oxide is used for the antifouling coating, spherical titanium oxide fine particles are mixed with the aqueous coating composition of the present invention to be used as an antifouling coating agent or a titanium oxide sol obtained by hydrolyzing titanium tetraalkoxide or aluminum alkoxide as a coating agent. Can be used. Alternatively, an antifouling paint or a silicone rubber antifouling paint containing a polymerizable unsaturated carboxylic acid silyl ester component unit-containing copolymer may be used. It is preferable to use an undiluted coating agent as described above without diluting with water. The thickness of the dry coating film after drying of the fourth agent is preferably 1 to 30 μm in consideration of coating film adhesion strength and antifouling effect.

As described above, the ultra-medium-pressure and ultra-weather resistant methods of the present invention have been described. However, the method of the present invention is not limited to the following examples, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are obviously within the scope of the claims set out below.

3. Example

Preparation Example 1. Preparation of metal complex-type cross-linking aqueous acrylic resin

First, insert 510 g of ionized water and 1.07 g of SR-10 from ADEKA as a reactive emulsifier containing aryl groups in a four-necked flask equipped with a nitrogen inlet, a thermometer, a cooler, and an agitator. 160 g of ethylhexyl acrylate, 140 g of methyl methacrylate, 30 g of glycidyl acrylate, 30 g of hydroxyethyl methacrylate, 15 g of hydroxy propyl acrylate, 15 g of methyl methacrylate, and 50 g of diacetone acrylamide were introduced into the reactor. After that, 0.80 g of potassium sulfate was added to 50 g of ionized water for 2 hours. At this time, an exothermic reaction occurs, and the reaction is completed after one hour from the time when no exothermic reaction occurs. After completion of the reaction, cooling water was added to cool the reactant to 40 ° C. or lower, and then 8 g of ammonia water and 13 g of adipic dihydrad were sequentially added to prepare a room temperature cross-linkable aqueous acrylic resin containing no emulsifier.

Next, 70 g of ionized water, 10 g of zinc oxide, 10 g of ammonia water, and 10 g of ammonium bicarbonate were added to the flask and stirred at 60 ° C. to prepare a solution for metal complex, and 60 g of the solution and 1000 g of the room temperature crosslinkable aqueous acrylic resin were mixed. A metal complexed room temperature crosslinkable aqueous acrylic resin is prepared.

Preparation Example 2. Preparation of Eco-friendly Water-Based Coating Composition

700 g of carbon nanotube powder, 100 g of nickel powder, 50 g of carbon black, 100 g of deionized water, 5 g of Disperbyk190 (BYK) as a dispersant, 5 g of Benton EW (Rheox) as a work initiator 3g Tego1488 (TEGO Co., Ltd.) as an antifoaming agent, 2 g of RM815 (Rom & Haas) and 5 g of RM2020 (Rom & Haas) as a thickener, and 10 g of SodiumNitrite as an initial anti-rust inhibitor, followed by stirring Was prepared.

Preparation Example 3 Production of Undercoat for Primer

100 g of water was added to 1 kg of the environmentally friendly water-based coating composition of Preparation Example 2 to prepare a coat used as a primer.

[Production Example 4. Preparation of Intermediate for Anti-Medium Mode]

180 g of RTC-90 as an anti-corrosive paint, 50 g of Shieldex C303 (Grace Davison), 50 g of SZP-309 (HALOX), 100 g of OM-5 (Omiya), zinc stearate to 1 kg of the aqueous coating composition of Preparation Example 2 25g of emulsion and 3g of TINVUIN 5151 (Ciba-geigy Co., Ltd.) were added as a sunscreen and stirred to prepare a medium for the ultra-low weight method.

Preparation Example 5. Preparation of Top Coating for Ultra-Weather Resistance Corrosion]

700 g of deionized water, RTC-90 150 g, cobalt blue inorganic pigment 100 g, Disperbyk190 (BYK company) 5 g as a dispersant, Benton EW (Rheox company) as a workability initiator ) 3g, Tego1488 (TEGO Co., Ltd.) 3g as antifoaming agent, 2g RM815 (Roam & Haas Co.) and 5g RM2020 (Rom & Haas Co.) as thickener, 10g Sodium Nitrite as initial rust inhibitor After adding 10 g of TINVUIN 5151 (Ciba Geigy) as a blocking agent, 250 g of the isocyanate curing agent was mixed and stirred to prepare a top coat for ultra-weather resistance.

Preparation Example 6. Paint prepared by Example 1 of Korean Patent 10-0503561 (Reference 1)

For the control experiment, paint was mixed with a powder mixture consisting of 0.3% by weight of zinc, 0.5% by weight of chromium, 0.7% by weight of nickel, 0.1% by weight of phosphorus, and 97.8% by weight of aluminum and a polyurethane resin in a ratio of 1:10. Prepared.

[Examples 1 to 8]

Using the coating composition prepared in Preparation Examples 2 to 6 was carried out the super-heavy anticorrosion, ultra-weatherproof anticorrosion method of the present invention. After degreasing the zinc phosphate treated cold rolled steel sheet of 100 × 100 × 1 mm with xylene, the paint prepared in Preparation Examples 3, 4, and 5 of the present invention was spray-coated to form a coating film, and left at room temperature for 1 day. In addition, as a control, the cold-rolled steel sheet was treated using the paint prepared in Preparation Example 6. Table 1 summarizes the coating film thickness of the specimen produced in the above manner. In Table 1 below, X-1 is a degree, X-2 is a degree, and X-3 means a degree.

[Table 1] Test Specimen Composition and Coating Film Thickness

division Part 1 (primer) Second agent (super middle and middle anticorrosive) Third agent (Ultra-weatherproof anticorrosive) Fourth agent (pollution inhibitor) Example 1 X-1, 25㎛ X-2, 100 μm X-3, 50 Do not use Example 2 X-1, 50㎛ X-2, 100 X-3, 50 Do not use Example 3 X-1, 100㎛ X-2, 100 X-3, 50 Do not use Example 4 X-1, 25㎛ X-2, 200 X-3, 50 Do not use Example 5 X-1, 50㎛ X-2, 200 X-3, 50 use Example 6 X-1, 100㎛ X-2, 200 X-3, 50 use Example 7 Preparation Example 6, 100 μm 4,100㎛ Do not use Example 8 Preparation Example 6, 50 µm use

Property evaluation

Evaluation of the reliability, adhesion strength, elongation rate, MVTR was performed on the specimens prepared as in Table 1, and the results are summarized in Tables 2, 3, and 4 below.

[Table 2] Reliability Evaluation Experiments for Heavy Methods (Evaluation after 4000 Hours of Salt Spray)

division Outgoing Outbreak site breakage Blistering Area Test Methods KS D 9502: 2005 KS D 9502: 2005-One Side KS D 9502: 2005 Example 1 0.2% or less 0.3mm 0.2mm or less Example 2 0.1% or less 0.2mm 0.2mm or less Example 3 0.1% or less 0.2mm 0.2mm or less Example 4 0.1% or less 0.2mm 0.1mm or less Example 5 0.1% or less 0.1mm 0.1mm or less Example 6 0.1% or less 0.1mm 0.1mm or less Example 7 0.5% or less 1.0mm Less than 0.5mm Example 8 1.5% or more 2.0mm 1.0mm or less

[Table 3] Bonding strength, elongation (flexibility), MVTR (moisture permeability) test of coating film

division Adhesion strength Acid resistance (10% sulfuric acid solution, 168 hours) Flex resistance Φ 10 mm, 180 ° bend) Water resistance Test Methods KS F 4715-01 KSM IS0 2812-1-02 KS M 5000-03 KS M IS0 2812-1-02 Example 1 31kgf / cm clear clear clear Example 2 32kgf / cm clear clear clear Example 3 34kgf / cm clear clear clear Example 4 32kgf / cm clear clear clear Example 5 32kgf / cm clear clear clear Example 6 35kgf / cm clear clear clear Example 7 28kgf / cm clear clear clear Example 8 32kgf / cm clear clear clear

[Table 4] Ultra-Weather Resistance Reliability Evaluation

division Discoloration after accelerated weathering test (WS-A, 500 hours) Discoloration after accelerated weathering test (WS-A, 1000 hours) Discoloration after accelerated weathering test (WS-A, 2000 hours) Discoloration after accelerated weathering test (WS-A, 3000 hours) Test Methods KS F 2274 KS F 2274 KS F 2274 KS F 2274 Example 1 clear clear clear clear Example 2 clear clear clear clear Example 3 clear clear clear clear Example 4 clear clear clear clear Example 5 clear clear clear clear Example 6 clear clear clear clear Example 7 clear clear clear clear Example 8 clear clear clear clear

As shown in the above table, the eco-friendly super-medium-medium- and super-weather type water-soluble paint composition including the eco-friendly water-based paint composition of the present invention has excellent salt prevention property and adhesive strength of the coating film as compared to the control (Experimental Example 7, Experimental Example 8). It was found to be excellent.

1 is a flow chart schematically showing the process sequence of the ultra-mid-pressure and ultra-weather resistant method of the present invention.

Claims (8)

28 to 89% by weight of a room temperature crosslinkable aqueous acrylic resin in which zinc oxide or zirconium oxide is hydrogen-bonded with a carboxyl group of an acrylic resin to form a complex; 1 to 70% by weight of a conductive filler which is one or a mixture of two or more selected from carbon nanotubes, copper, nickel, conductive carbon dioxide and silver; 1 to 5% by weight of at least one dispersant selected from alkylsulfonates, sulfonate oils, alkaline ethers and polyoxyethylenes; 1 to 5 wt% of methyl cellulose, ethyl cellulose, polyacrylates, silicone antifoaming agents, isothiazoline derivatives and other additives selected from two or more of butylene oxide; Eco-friendly aqueous coating composition consisting of. According to claim 1, The amount of the zinc oxide or zirconium oxide complexed with the room temperature cross-linkable aqueous acrylic resin is 0.15 to 3% by weight based on 100% by weight of the acrylic resin. delete delete delete Surface treatment step of removing the deteriorated portion or foreign matter on the surface of the concrete structure or steel structure; 28 to 89 wt% of a room temperature crosslinkable aqueous acrylic resin in which zinc oxide or zirconium oxide is hydrogen-bonded to a carboxyl group of an acrylic resin to form a complex on a surface of the treated structure; 1 to 70% by weight of a conductive filler which is one or a mixture of two or more selected from carbon nanotubes, copper, nickel, conductive carbon dioxide and silver; 1 to 5% by weight of at least one dispersant selected from alkylsulfonates, sulfonate oils, alkaline ethers and polyoxyethylenes; 1 to 5 wt% of methyl cellulose, ethyl cellulose, polyacrylates, silicone antifoaming agents, isothiazoline derivatives and other additives selected from two or more of butylene oxide; Forming a coating film using an environmentally friendly aqueous coating composition; Eco-friendly super-medium- and high-temperature weatherproof method including a. The method of claim 6, Forming a coating film using the environmentally friendly water-based coating composition, Applying the aqueous coating composition stock solution or diluent to form a first coating film; Adding an inorganic pigment, an organic pigment, or a sunscreen agent to the aqueous coating composition on the first coating film and then applying the same to form a second coating film; Adding an inorganic pigment, an organic pigment or a sunscreen agent to the room temperature crosslinkable aqueous acrylic resin having a complex formed with the zinc oxide or zirconium oxide on the second coating film, and then applying the same to form a third coating film; Eco-friendly medium-medium-type, ultra-climate weatherproof method characterized in that consisting of. The method according to claim 6 or 7, Eco-friendly ultra-medium-and-middle-secondary method comprising the step of further forming an antifouling coating film using an antifouling paint or a silicone rubber antifouling paint comprising a titanium oxide fine particle or a titanium oxide sol and a polymerizable unit containing a polymerizable unsaturated carboxylic acid silyl ester component. Weatherproof method.

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