KR101737008B1 - Coating composition used in prevention of corrosion, salt-attack and neutralization and coating method threrof - Google Patents

Abstract

The present invention relates to a curable composition comprising 30 to 50% by weight of an epoxy modified acrylate, 20 to 30% by weight of an unsaturated polyester, 1 to 10% by weight of metal nanoparticles, 1 to 10% by weight of volcanic ash, 1 to 10% By weight, based on the total weight of the coating composition.
The neutralization, salt and corrosion inhibitor coating composition according to the present invention is characterized by being capable of forming a thick coating film, having excellent water resistance, salt water resistance, acid resistance and alkali resistance, and having resource-saving and low-pollution functionality.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition for preventing corrosion, neutralization, salt corrosion and corrosion, and a coating method for coating the same. 2. Description of the Related Art Coating composition,

The present invention relates to a coating composition for preventing neutralization, salt corrosion and corrosion, and a coating method thereof.

The civil engineering facility using concrete is a national infrastructure and plays a very important role in the national economy for the centennial era. These concrete structures have semi-permanent lifetime of more than 100 years, but they cause corrosion of the concrete caused by increasingly severe atmospheric pollution, especially chloride, neutralization, chemical corrosion, and the like, thereby corrosion of reinforcing bar, which is the main material of reinforced concrete, There is a phenomenon that the lifetime is remarkably shortened.

Most of the deterioration of sewage box structures is caused by the reaction of cement hydrates in concrete with chemicals (corrosive substances), and the internal structure of cement hardeners is replicated. Cement hydrates react with substances such as sulfates to generate expansion pressure of the compounds, Is deteriorated.

In addition, since the concrete has strong alkali (pH 12 ~ 13) due to the Ca (OH) generated by the hydration reaction of cement, reinforcing bars embedded in concrete generally do not corrode. However, when the action of carbon dioxide gas in the air is received in the long term, the calcium hydroxide in the concrete gradually turns into calcium carbonate, and the pH is lowered to about 0.8 to 10, so that the concrete is neutralized to lose its alkaline properties.

This neutralization progresses from the concrete surface to the interior, and the concrete becomes heavier and dense as the weight of the carbon dioxide reacts with the carbon dioxide. When the concrete is neutralized and water and air penetrate, the steel corrodes and the volume of the reinforcing bar expands, causing cracks in the concrete, and the strength and durability of the structure are lost.

In order to prevent such a phenomenon, conventionally, a material containing a polyol and isocyanate as a base material is penetrated and cured on the surface of the concrete, and an epoxy resin containing a general pigment is applied to the surface of the concrete to paint an epoxy resin containing a general pigment on the surface of the concrete, And has prevented the neutralization and salting of the water.

Such a coating method is a method of achieving the object depending on the physical strength and chemical stability of the cured product of the epoxy resin. Therefore, the coating is easily damaged by sand or dust blown in the wind, so that moisture penetrates into the concrete surface and the coating film is peeled off. The coating film is easily broken by frequent waves, and permanent neutralization and prevention of saltiness are not prevented, which causes repetitive repair work for a short period of time, resulting in an economical loss.

Accordingly, the present invention has developed a coating composition for neutralization, salting and corrosion prevention which can solve the above-mentioned problems, and the present invention has been completed on the basis thereof.

Accordingly, one aspect of the present invention is to provide a coating composition for neutralization, salting-out and corrosion prevention, which is capable of coating a thick film, having excellent water resistance, salt water resistance, acid resistance and alkali resistance, There is.

Another aspect of the present invention is to provide a coating method using the coating composition.

In order to achieve the above-mentioned one aspect, the neutralizing, salting-proof and anticorrosion coating composition according to one embodiment of the present invention comprises 30 to 50% by weight of an epoxy-modified acrylate, 20 to 30% by weight of an unsaturated polyester, 1 to 10% by weight of volcanic ash, 1 to 10% by weight of silicon, and 15 to 35% by weight of a curing agent.

In another embodiment of the coating composition, the epoxy-modified acrylate comprises a structure represented by the following formula (1).

[Chemical Formula 1]

In another embodiment of the paint composition, the unsaturated polyester comprises a structure of the formula:

(2)

Here, x is an integer of 1 to 10, and n is an integer of 1 to 20.

In another embodiment of the coating composition, the metal nanoparticles are at least one selected from silver, gold, platinum, palladium and copper having an average particle diameter of 10 to 100 nm.

In another embodiment of the coating composition, the silicone comprises a structure of the formula:

(3)

Here, a and c are each an integer of 1 to 10, and b and d are an integer of 1 to 15, respectively.

In another embodiment of the paint composition, the ash material is in powder form and has an average diameter of 0.05 to 2 mm, 55 to 65 wt% silica (SiO ₂ ), 10 to 15 wt% alumina (Al ₂ O ₃ ) %, sodium oxide (Na ₂ O) 1 to 5% by weight, iron oxide (Fe ₂ O ₃₎ 1 to 5% by weight, calcium (CaO) 3 to 10% by weight, and potassium (K ₂ O) 1 to 5 oxide By weight.

In another embodiment of the coating composition, the epoxy-modified acrylate comprises 55 to 75% by weight of the monomer, 10 to 35% by weight of the solvent, 1,1,3,3-tetramethylperoxy 2-ethylhexano And 3 to 10% by weight of chain transfer agent and 1 to 5% by weight of chain transfer agent.

In another embodiment of the coating composition, the monomer comprises 30 to 45% by weight of i-butylacrylate, 25 to 40% by weight of methylmethacrylate, 2-hydroxypropyl acrylate 10 to 20% by weight of hydroxypropylacrylate, 5 to 10% by weight of hydroxyl-functional acrylate and 5 to 10% by weight of glycidylmethacrylate.

According to another aspect of the present invention, there is provided a method of coating a neutralization, salting, and corrosion prevention coating composition, comprising: removing latent and foreign matter from a surface of a concrete structure or a steel structure; Forming a primer layer on the surface of the concrete structure or the steel structure from which the foreign matter is removed; Applying and curing a coating composition comprising 30 to 50% by weight of an epoxy modified acrylate, 20 to 30% by weight of an unsaturated polyester, 1 to 10% by weight of silicon and 15 to 35% by weight of a curing agent on the surface of the primer layer, ; And applying and curing the coating composition according to any one of the embodiments of the present invention described above to the surface of the primer layer to form a top layer.

The coating composition according to the present invention is not only poor in water permeability and oxygen permeability, but also exhibits resistance to water absorption and is excellent in ion-permeability, acid resistance and alkali resistance.

Further, the coating composition according to the present invention is excellent in weather resistance and durability, and has excellent painting workability. That is, it is excellent in adhesion to concrete and / or metal surface or undercoat, and a thick coating film is possible.

In addition, it can be applied to the inner surface of steel pipes and drinking water tanks by applying nano metal.

Before describing the invention in more detail, it is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense, It should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the constitution of the embodiments described in the present specification is merely a preferred example of the present invention, and does not represent all the technical ideas of the present invention, so that various equivalents and variations And the like.

Hereinafter, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The neutralization, salting and corrosion protection coating compositions according to one embodiment of the present invention basically include epoxy-modified acrylates, unsaturated polyesters, metal nanoparticles, volcanic ash, silicon, and curing agents.

When a paint is prepared using such a neutralization, salt and corrosion inhibiting coating composition, it has excellent water resistance, salt water resistance, acid resistance, alkali resistance and the like, and has excellent adhesion to the surface of a concrete structure or a steel structure.

The coating material using the neutralization, salt and corrosion inhibiting coating composition according to the present invention is preferably used mainly on the surface of a concrete structure or a steel structure. However, the application field is not limited to a concrete structure or a steel structure, It can be applied to various fields such as facilities and vehicles.

Conventional paints were a form in which a simple acrylate not modified with an epoxy group was mixed with silicon or a saturated polyester was mixed with silicon.

However, simple acrylates which are not denatured with an epoxy group fail to exhibit sufficient moisture repellency, and when used on surfaces of concrete structures or steel structures, there is a problem in that they can not sufficiently exhibit water resistance, salt water resistance, acid resistance and alkali resistance. To overcome these drawbacks.

As described above, in the present invention, unlike the conventional coating compositions, acrylate and unsaturated polyester modified with an epoxy group are mixed at a certain ratio, and metal nanoparticles are simultaneously used in the composition, whereby excellent water resistance, salt resistance, acid resistance and alkali resistance And the like.

The compositional ratios of the neutralization, salt and corrosion inhibitor coating composition according to one embodiment of the present invention are as follows.

The epoxy-modified acrylate is contained in an amount of 30 to 50% by weight based on the total composition, the unsaturated polyester is contained in an amount of 20 to 30% by weight based on the total composition, and the metal nano- %, The ash content is 1 to 10% by weight based on the total composition, and the silicon is contained in an amount of 1 to 10% by weight based on the total composition. On the other hand, the curing agent is contained in an amount of 15 to 35% by weight based on the total composition.

When the composition ratio of the epoxy-modified acrylate is less than 30% by weight, there is a problem that the weather resistance and the crack-preventing effect of the paint are deteriorated. When the composition is more than 50% by weight, the addition amount of the remaining components is limited.

The unsaturated polyester is characterized by excellent weather resistance, light resistance, scratch resistance and high crosslinking density. Therefore, when the composition ratio of the unsaturated polyester is less than 20% by weight, the weatherability, light resistance, scratch resistance and crosslinking density are lowered, and the durability of the coating is lowered. When the composition is more than 30% by weight, .

The metal nanoparticles exhibit an antibacterial / sterilizing function, an air purifying function, and a deodorizing function. That is, metal nanoparticles infiltrate in airborne germs and fungi that inactivate their metabolism and exhibit a strong antibacterial function, and are applied to various fields without harming human body.

In particular, metal nanoparticles adsorb and decompose ammonia, trimethylamine, hydrogen sulfide, and methyl mercaptan, which are the causes of the four odors, and exhibit excellent deodorizing function.

The types of metal nanoparticles that can be used in the present invention are very diverse. For example, silver nanoparticles, gold nanoparticles, platinum nanoparticles, palladium nanoparticles, and copper nanoparticles can be used, or combinations thereof have.

The metal nanoparticles used in the present invention may be those having an average particle diameter of 10 to 100 nm. Namely, nanoparticles having an average particle diameter of less than 10 nm are very difficult to produce, and their effects have not been verified. On the other hand, when the average diameter of the particles exceeds 100 nm, there is a problem that the antibacterial / sterilizing function, the air purification function, and the deodorizing function are remarkably deteriorated.

When the content of the metal nano-particles is less than 1% by weight, sufficient antibacterial and deodorizing functions are not exhibited. When the content exceeds 10% by weight, the manufacturing cost is increased and the non- Which is difficult to apply and the stability of the coating after application is lowered.

The ash powder and the average diameter of particles 0.05 to 2㎜, and silica (SiO ₂₎ 55 to 65% by weight, alumina (Al ₂ O ₃₎ 10 to 15 weight%, sodium (Na ₂ O) 1 to oxidation (Fe ₂ O ₃ ) 1 to 5 wt%, calcium oxide (CaO) 3 to 10 wt%, and potassium oxide (K ₂ O) 1 to 5 wt% as main components, As an ingredient.

Particularly, such ash ash is excellent in moisture absorption and moisture-proof effect, maintains the indoor humidity constant at all times, and prevents a situation where the interior is excessively dried due to heating, thereby helping to create a pleasant indoor environment.

Further, the above volcanic ash is stable to temperature change, and exhibits a function of suppressing the occurrence of condensation and fungus mites. Particularly, ash has an excellent effect of purifying the air by sucking pollutants. These volcanic ash basically contain no harmful chemical substances, and adsorb volatile organic solvents such as formaldehyde and toluene.

In addition, the ash material has a property of absorbing sound waves and isolating vibration, so that it is possible to exert a very excellent noise shielding effect when it is included in a soundproofing composition. Particularly, when a paint is manufactured using an ash, the water resistance and weather resistance are excellent, and the phenomenon of peeling or cracking of the coating is remarkably reduced. Since it is a quasi-nonflammable material, the generation of toxic gas due to the fire can be drastically reduced.

When the content of the volcanic material is less than 1% by weight, sufficient antibacterial and deodorizing functions and weather resistance are not exhibited. When the content of the volcanic material exceeds 10% by weight, the stability of the coating is deteriorated .

In addition, the silicone is hydrophobic and exhibits an excellent reflecting structure by increasing the repulsive force against water and extending to the surface and the inside of the coating film in the form of a long chain. Therefore, when the composition ratio of silicon is less than 1% by weight, the repulsive force of water in contact with the surface is lowered and the durability of the paint is lowered. When the composition ratio exceeds 10% by weight, there is a problem.

On the other hand, when the curing agent is added in an amount of less than 15% by weight based on the total composition, the curing efficiency of the coating is lowered. When the curing agent is more than 35% by weight, the coating operation is not efficient due to excessive curing.

The epoxy-modified acrylate may be prepared using a monomer, a solvent, a reaction initiator, and a chain transfer agent.

Each of these components will be specifically described below.

The monomer is added in an amount of 55 to 75% by weight. The monomer may be selected from the group consisting of i-butylacrylate (i-BA), methylmethacrylate (MMA), hydroxypropylacrylate (2-HPA), hydroxyl functional acrylate hydroxyl-functional acrylate (Tone-100) and glycidylmethacrylate (GMA). The composition ratio of the monomers used in the preparation of the epoxy-modified acrylate according to the present invention is i-butyl acrylate 30 to 45% by weight of i-butylacrylate I-BA, 25 to 40% by weight of methylmethacrylate (MMA), 10 to 20% by weight of hydroxypropylacrylate (2-HPA) 5 to 10% by weight of a hydroxyl-functional acrylate (Tone-100), and 5 to 10% by weight of glycidylmethacrylate (GMA).

 If the addition amount of the total monomer is less than 55% by weight, there is a problem that defoaming property, flexural resistance, weather resistance and scratch resistance are deteriorated. When the addition amount exceeds 75% by weight, addition amount of other components is limited and there is an uneconomical problem.

The i-butyl acrylate has bubble resistance, bending resistance and lipophilicity, and methyl methacrylate has weather resistance. In addition, the 2-hydroxypropyl acrylate has a hydroxyl group exhibiting a low steric hindrance effect and is related to postcurement control and hydrophilicity.

On the other hand, the hydroxyl functional acrylate has a hydroxyl group exhibiting a high steric hindrance effect and is related to the pre-curing control and the moisture repellency. In addition, the above glycidyl methacrylate has the effect of maximizing the crosslinking density of the coating material and preventing cracking.

Therefore, when the composition ratio of the above monomers is used, the characteristics of each of these monomers can be best exhibited.

The solvent is added in an amount of 10 to 35% by weight. When the amount of the solvent is less than 10% by weight, the dispersibility of the components constituting the epoxy-modified acrylate decreases. When the amount of the solvent is more than 35% by weight, an excessively long time is required to prepare the epoxy-modified acrylate A problem arises.

The solvent may be selected from the group consisting of acetone, methylethylketone, cyclohexanone, methylcellusolve, ethylcellusolve, butylcellusolve, ethylacetate, And butylacetate. However, the scope of the present invention is not limited to these solvents, and various solvents can be used in addition to these solvents.

The reaction initiator is preferably added in an amount of 3 to 10% by weight. When the addition amount of the reaction initiator is less than 3% by weight, the production yield of the epoxy-modified acrylate is markedly decreased. When the addition amount exceeds 10% by weight, the problem of remaining initiator not participating in the reaction and uneconomical problems arise.

As the reaction initiator, 1,1,3,3-tetramethyl peroxy 2-ethylhexanoate (1,1,3,3-tetramethyl peroxy 2-ethylhexanoate) may be used.

The chain transfer agent is contained in an amount of 1 to 5% by weight. As the chain transfer agent, 2-mercaptoethanol (2-hydroxyethanethio) may be used. The chain transfer agent may be used as a chain transfer agent for various monomer The radical polymerization of one monomer is stopped and the polymerization of the other monomer is promoted.

That is, by controlling the addition amount of the chain transfer agent, the repeating units of various kinds of monomers can be controlled. When the addition amount of the chain transfer agent is less than 1 wt% or exceeds 5 wt%, there is a problem that the epoxy-modified acrylate used in the present invention is not produced.

The epoxy-modified acrylate may be a compound represented by the following formula (1) or a compound containing the same.

[Chemical Formula 1]

The water repellency, ion permeability, acid resistance, alkali resistance and the like are generated by the hydroxyl group (-OH) and the epoxy group (-COC-) contained in the formula 1. When the curing reaction is performed using a curing agent described below, A detailed three-dimensional network structure is formed and a reflecting structure of the paint is given. Due to such characteristics, the paint may not pass harmful substances which promote the rust of steel products such as sulfur dioxide, chlorine gas, carbon dioxide gas, chloride, lactate, carbonate, acid, and alkali.

In addition, generally, when a hydrophilic contaminant such as dust approaches the hydrophobic surface of a paint in which the paint of the present invention is used, a repulsive force is generated to prevent the contaminants from attaching easily, And is easily removed from the surface of the coating.

In addition, the unsaturated polyester may include a compound represented by the following general formula (2).

(2)

In Formula 2, x is an integer of 1 to 10, and n is an integer of 1 to 20.

The unsaturated polyester has excellent weather resistance, light resistance, scratch resistance and high crosslinking density, which is attributable to the hydroxyl group (-OH) present at the end of the above formula (2).

In addition, the silicon may include a compound represented by the following formula (3).

(3)

Here, a and c are each an integer of 1 to 10, and b and d are an integer of 1 to 15, respectively.

The silicone is hydrophobic and has an increased repulsive force against water and is dispersed to the surface and the inside of the coating film in a long chain to realize excellent antireflective property. This action is caused by the hydroxyl group (-OH) present at the end of Formula 3, .

On the other hand, epoxy modified acrylates, unsaturated polyesters and silicones each having the general formulas (1) to (3) are mixed together with a urethane curing agent to form them into a three-dimensional network structure and cured to uniformly disperse the nano- When the coating composition is prepared, it is possible to maximize the dense three-dimensional crosslinking density, so that the silicone acts semi-permanently on the coating film. As the urethane-based curing agent, it is possible to use HDI-trimer of Bayer Leverkusen.

Furthermore, the coating composition according to the present invention may further comprise 0.1 to 1% by weight of a dispersant, which is selected from the group consisting of polyalkylene glycols, polyalkylene glycol esters, polyoxyalkylene polyhydric alcohols, sulfonic acid esters , A sulfonate, a carboxylic acid ester, a carboxylate, and an alkylamine. Particularly commercially available Nopco 44S may be used.

The dispersant is preliminarily mixed with the above-described volcanic ash and the like, pretreated, mixed with the other components of the ash pretreated with the dispersant, and the mixture of the ash, the metal nano-particles and the epoxy-modified acrylate, By weight. The dispersant plays a role of helping the ash and the metal nano-particles to maintain a sufficiently dispersed state in the composition, and when the content of the component in the coating composition is less than 0.1% by weight, the efficient dispersion of the components There is a problem that a uniform addition effect can not be obtained, and when it exceeds 1% by weight, it is uneconomical.

The coating composition according to the present invention may further contain a defoaming agent in an amount of 0.1 to 0.5% by weight, and the defoaming agent may be selected from the group consisting of modified silicone, fatty acids, higher alcohols, minerals, higher fatty acid glycerides, dimethylpolysiloxanes, polypropylene glycols and hydrophobic silica , And a commercially available Nopco NDW may be used.

The antifoaming agent is used for the purpose of suppressing the generation of bubbles which may occur during the coating composition or the process for producing the paint containing the same or during the dispersion of the pigment. When the amount of the antifoaming agent contained in the coating composition is less than 0.1% by weight, The defoaming function is weak and unnecessary bubbles are generated. As a result, the stability of the resulting coating composition and coating material containing the same is deteriorated. When the amount of the coating composition is more than 0.5% by weight, unnecessary cost is incurred.

As described above, the coating method or the repair coating method of the neutralization, salting and corrosion prevention coating composition according to one embodiment of the present invention includes an optional cleaning step of removing the laitance and foreign matter on the surface of the concrete structure or the steel structure; Forming a primer layer on the surface of the concrete structure or the steel structure from which the foreign matter is removed; Applying and curing a coating composition comprising 30 to 50% by weight of an epoxy modified acrylate, 20 to 30% by weight of an unsaturated polyester, 1 to 10% by weight of silicon and 15 to 35% by weight of a curing agent on the surface of the primer layer, ; And applying and curing the coating composition according to any one of the above-described embodiments of the present invention to the surface of the undercoat layer to form an upper layer.

That is, the surface of the structure is treated by sequentially performing a cleaning step of the structure, a primer layer forming step, a lower layer forming step, and a top layer forming step using the coating composition for preventing neutralization and corrosion according to the present invention. In this case, a middle layer may be selectively formed between the lower and upper surfaces.

The washing step is for selectively removing laitance and foreign matter on the surface of the concrete structure or the steel structure and removing dust and dust. The removal of the laitance and foreign matter may be performed by various surface treatment methods such as sandpaper polishing or grinding Can be adopted. Particularly, it is desirable to perform wet air grinding when removing the laitance, because the generation of complaints due to dust generation and the atmospheric environment problems can be prevented in advance during the grinder operation. In addition, dust and dirt on the surface of concrete structures or steel structures can be removed by using a high-pressure water washing machine. When using such a high-pressure water washing machine, the pressure range is preferably 200 to 300 bar. However, this cleaning step may be omitted depending on the contamination state of the structure.

Next, in the primer layer forming step, a primer layer is formed on the base surface of the structure using a conventional primer, for example, a ceramic resin or the like. The above-mentioned ceramic resin can be a commercially available product, is formed by a sol-gel process, and is obtained by putting methyl methacrylate in pores of a silica gel obtained by using a silicon alkoxide, followed by polymerization reaction. Examples of the silicon alkoxide include silicon tetraethoxide, silicon tetramethoxide and the like. The content of methyl methacrylate is 0.1 to 3 parts by weight based on 100 parts by weight of the silicon alkoxide.

The primer layer has excellent adhesion regardless of the material of the structure. Moisture condensation, humidity, water vapor, and the like generated in a natural environment (at high temperature and cold cycle repetition) are discharged through a hole having a porous structure of 0.0004 탆, Fog and rainwater of 1.00 ~ 6.000㎛ size protects the base material by preventing penetration, and it prolongs the durability of deterioration and neutralization process. Particularly, it has an excellent function to block invasion of various harmful substances and gases in the atmosphere, and to provide acid, alkali, salt water and heat resistance.

On the other hand, in the case of a repair coating of the structure, it is possible to optionally include a step of applying a putty material on the cleaned concrete structure or the steel structure surface to fill the surface before forming the primer layer. The elastic putty is advantageous in that it can heal cracking or micro cracks by using an elastic putty material, that is, a repair agent, when microcracks due to shrinkage and expansion of concrete structures and steel structures occur, and to cope with initial cracks.

The undercoat layer forming step then comprises applying a coating composition comprising 30 to 50% by weight of an epoxy modified acrylate, 20 to 30% by weight of an unsaturated polyester, 1 to 10% by weight of silicon and 15 to 35% by weight of a curing agent, To form a primer layer.

Generally, the surface of a concrete structure or a steel structure is alkaline and hydrophilic, dust exists on the surface, and pores and residues are present, making it difficult to firmly adhere the coating.

Therefore, surface treatment of a concrete structure or a steel structure with a coating composition forming the undercoat layer enables deep penetration into the pores and cracks of the conductor.

The components constituting the coating composition for undercoat layer are composed of the above-mentioned epoxy-modified acrylate, unsaturated polyester, silicone, and a curing agent, and are excellent in adhesiveness and compatibility with the coating composition of the present invention, And has a characteristic of improving permeability. The undercoating layer may be surface-treated with a spray, brush, roller, or the like, but is preferably applied using an injection device.

Finally, in the forming of the upper layer, a coating composition according to any one of the embodiments of the present invention described above is applied and cured by a jetting apparatus to form an upper layer.

Since the components constituting the main resin such as the undercoat layer are epoxy-modified acrylate and unsaturated polyester, the top coat layer forms a top coat layer with excellent adhesion to the undercoat layer. Since the coating composition of the present invention is a coating composition such as a gel of usefulness, the coating composition spraying apparatus can be used.

Thus, the coating composition according to the present invention not only has low water permeability and oxygen permeability, but also exhibits resistance to water absorption, excellent ion permeability, acid resistance and alkali resistance. Further, the coating composition according to the present invention is excellent in weather resistance and durability, and has excellent painting workability.

That is, it is excellent in adhesion to concrete and / or metal surface or undercoat, and a thick coating film is possible. In addition, it can be applied to the inner surface of steel pipes and drinking water tanks by applying nano metal.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the scope of the present invention is not limited to the following examples.

Synthesis Example 1 - Synthesis of epoxy-modified acrylate

(butyl acetate), 16.46 g of a solvent (1,1,3,3-tetramethylperoxy-2-hydroxypropyl) acetate, 21.41 g of i-BA, 18.83 g of MMA, 9.06 g of 2-HPA, 4.70 g of Tone- Ethylhexanoate) and 2.63 g of a chain transfer agent (2-mercaptoethanol (2-hydroxyethanethio)) were mixed and maintained at 120 ° C for 5 hours to perform dropping, (Tg = 15 ° C., Nv = 70%, Mw = 24,000, Mn = 9100, PDI = 2.63, Vis = 3800) through aging with maintaining the temperature at 120 ° C. for 2 hours. Were synthesized.

Synthesis Example 2 - Synthesis of unsaturated polyester

45.13 g (5.45 mol) of fumaric acid, 15.11 g (4.22 mol) of ethylene glycol, and 15.11 g (2.46 mol) of diethylene glycol were mixed and heated to 150 DEG C, To increase the reaction temperature. Thereafter, water (H ₂ O) was removed and the reaction was maintained so that the acid value was 80 mg / KOH. The reaction product thus obtained was cooled to 130 ° C., and 24.43 g (1.97 mol) of trimethylol diallylether and 0.12 g of 4-methoxyphenol were added. The reaction temperature was elevated to 130 ° C. And the acid value of the unsaturated polyester was adjusted to 19.5 mg / KOH for 4 hours to 170 ° C.

Example 1

80.0 g of the epoxy-modified acrylate of Synthesis Example 1, 50.0 g of the unsaturated polyester of Synthesis Example 2 were mixed with 10.0 g of silicone of Formula 3 and 40.0 g of HDI-trimer (Bayer Leverkusen) as a curing agent to prepare a coating composition for undercoating .

Example 2

80.0 g of the epoxy-modified acrylate of Synthesis Example 1, 50.0 g of the unsaturated polyester of Synthesis Example 2, 8 g of volcanic ash having an average diameter of 0.05 to 2 mm, 8 g of silver nanoparticles having an average diameter of 10 to 100 nm, 10.0 g of silicone and 40.0 g of HDI-trimer (Bayer Leverkusen) as a curing agent to prepare an overlay coating composition.

Comparative Example 1

A commercially available conventional paint was used as a topcoat paint composition.

Hereinafter, experimental results obtained by verifying various effects of the coating composition according to the present invention and the coating material using the same will be described in detail.

Experimental Example 1

The paint prepared using the paint composition for undercoat prepared in Example 1 was sprayed onto a concrete wall having a size of 1 m x 1 m from which the foreign substance had been removed and sprayed on the concrete wall using the paint composition for topcoat prepared in Example 2 or Comparative Example 1 The sprayed paint was sprayed onto the primer and dried for 3 days. Using three concrete samples coated with the paint, the performance of the paint was tested by dividing into 6 items: hydrophobicity (water repellency), stain resistance, acid resistance, alkali resistance and antibacterial property.

Hydrophobic (water repellency) test - Removal of contaminants from water

The paint of Experimental Example 1 was tested for hydrophobicity, i.e., water repellency.

After the concrete samples were exposed for 3 months around the roads where pollution such as dust and vehicle exhaust gas was severe, the degree of removal of contaminants was measured by using a constant hose and running water, The state was set to 10, and the state in which no state was completely removed was divided into 10 grades. The results are shown in Table 1 below. As the water repellency (hydrophobicity) of the paint becomes stronger, the contaminants attached to the surface of the paint are easily removed by moisture. That is, contaminants such as dust and the like are usually hydrophilic and contaminants are contacted with and mixed with moisture and are easily removed from the surface of the hydrophobic coating.

Using a constant water pressure hose Running water Example 1 (Sample 1) 8 6 Example 1 (Sample 2) 7 5 Example 1 (Sample 3) 7 5 Comparative Example 1 (conventional paint) 3 One

As can be seen from Table 1, Samples 1 to 3 according to Example 1 of the present invention exhibited comparatively good pollutant removal performance with a measured value of 7 to 8 when water was sprayed using a hose having a constant water pressure However, in Comparative Example 1 in which the conventional paint is used, the measurement value is 3, which shows that the removal of contaminants is not good.

As a result of evaluating the pollutant removal performance by using water flowing naturally, samples 1 to 3 according to Experimental Example 1 of the present invention showed comparatively good pollutant removal performance with a measured value of 5 to 6 , It can be confirmed that in Comparative Example 1 where the conventional paint is used, the pollutant is hardly removed.

Contamination test

The stain resistance test was carried out using the paints of Experimental Example 1 and Comparative Example 1. The concrete samples were exposed to the surrounding roads and tunnels with severe pollution such as dust and vehicle exhaust gas for 3 months and then the degree of contamination on the surface was measured. The results are shown in Table 2 below. [Table 2] < tb > < TABLE >

Around the road tunnel Example 1 (Sample 1) 4 7 Example 1 (Sample 2) 5 5 Example 1 (Sample 3) 4 6 Comparative Example 1 8 10

As shown in Table 2, the samples 1 to 3 according to Experimental Example 1 of the present invention are relatively low in contamination degree from 4 to 5 in the case of the roadside and from 5 to 7 in the case of the tunnel, In the case of Comparative Example 1, which is the case of using 10% by weight, the degree of contamination is extremely high.

Test for alkalinity

The specimens according to Example 1 were soaked in NaOH (5%) for 24 hrs (KS M ISO 2812-1-03) and all were found to be OK.

Acid resistance test

The specimens according to Example 1 were immersed in H ₂ SO ₄ (5%) for 24 hours (KS M ISO 2812-01-13).

Antibacterial test

The antimicrobial activity was tested using the paints of Experimental Example 1 and Comparative Example 1. The concrete samples were exposed to the surrounding roads and tunnels with severe pollution such as dust, vehicle exhaust gas, etc. for 3 months, and microorganisms existing on the surface contaminants were measured. The results are shown in Table 3 below.

Around the road (cfu / ㎡) Tunnel (cfu / ㎡) Example 1 (Sample 1) 120 280 Example 2 (Sample 2) 70 180 Example 3 (Sample 3) 110 210 Comparative Example 1 630 720

Samples 1 to 3 according to Experimental Example 1 of the present invention were found to have 70 to 120 (cfu / m < 2 >) in the vicinity of the road and 180 to 280 (cfu / Able to know. However, in the case of Comparative Example 1 in which the conventional paint was used, it was found that the antimicrobial activity was significantly lowered in comparison with the present invention, in the case of the vicinity of the road, 630 (cfu / m 2) and in the case of the tunnel 720 (cfu / have.

Claims (9)

Wherein the composition comprises 30 to 50 wt% of an epoxy modified acrylate, 20 to 30 wt% of an unsaturated polyester, 1 to 10 wt% of metal nanoparticles, 1 to 10 wt% of a volcanic material, 1 to 10 wt% of silicon, and 15 to 35 wt% Including,
Wherein the metal nanoparticles are at least one selected from silver, gold, platinum, palladium and copper having an average diameter of 10 to 100 nm. The method according to claim 1,
Wherein the epoxy-modified acrylate comprises a structure represented by the following formula (1).
[Chemical Formula 1]

The method according to claim 1,
Wherein said unsaturated polyester comprises a structure of formula (2): < EMI ID =
(2)

Here, x is an integer of 1 to 10, and n is an integer of 1 to 20. delete The method according to claim 1,
Wherein the silicone comprises a structure of formula (3): < EMI ID =
(3)

Here, a and c are each an integer of 1 to 10, and b and d are an integer of 1 to 15, respectively. The method according to claim 1,
The ash powder and the average diameter of particles 0.05 to 2㎜, and silica (SiO ₂₎ 55 to 65% by weight, alumina (Al ₂ O ₃₎ 10 to 15 weight%, sodium (Na ₂ O) 1 to oxidation (1 to 5% by weight of iron oxide (Fe ₂ O ₃ ), 3 to 10% by weight of calcium oxide (CaO) and 1 to 5% by weight of potassium oxide (K ₂ O) Coating composition. The method according to claim 1,
The epoxy-modified acrylate is prepared by reacting 55 to 75% by weight of monomer, 10 to 35% by weight of solvent, 3 to 10% by weight of 1,1,3,3-tetramethylperoxy 2-ethylhexanoate as initiator, And 5 wt% of the total weight of the composition. The method of claim 7,
Wherein the monomer comprises 30 to 45% by weight of i-butylacrylate, 25 to 40% by weight of methyl ylmethacrylate, 10 to 20% by weight of 2-hydroxypropylacrylate, 5 to 10% by weight of a hydroxyl-functional acrylate, and 5 to 10% by weight of a glycidylmethacrylate. Removing laitance and foreign matter from the concrete structure or the steel structure surface;
Forming a primer layer on the surface of the concrete structure or the steel structure from which the foreign matter is removed;
Applying and curing a coating composition comprising 30 to 50% by weight of an epoxy modified acrylate, 20 to 30% by weight of an unsaturated polyester, 1 to 10% by weight of silicon and 15 to 35% by weight of a curing agent on the surface of the primer layer, ; And
A coating method of a neutralization, salt and corrosion inhibiting coating composition, comprising applying and curing the coating composition according to any one of claims 1 to 8 to the surface of the undercoat layer to form an upper layer.