KR101952074B1 - Paint composition and construction method for preventing salt damage and enhancing reflective property and visibility of concrete structure at roadside - Google Patents

Abstract

The present invention relates to a safety mark construction method of a road structure and a road structure obtained therefrom, which can prevent salt damage and neutralization by constructing a film of paint having a multilayered structure to form a safety mark, enhance a reflective property, and maintain a clean shape by enabling an advertisement to be hardly attached and preventing pollution.

Description

Technical Field [0001] The present invention relates to a paint composition for preventing corrosion of a road-side concrete structure, a reflection performance and a visibility-enhancing coating composition, and a construction method,

The present invention relates to a paint composition and a construction method that protect roads and roadway concrete structures from pollution and pollution and provide a retroreflective function to impart visibility even at night by imparting retroreflective performance by daylight, .

A utility pole or a telegraph pole is a pillar for connecting a wire or a communication line, and is installed on a road surface frequent in a vehicle or a walk. In the early days when the electric poles were introduced, they were made of wood, but later they were converted into long concrete with a useful life of over 30 years.

During the winter season, calcium chloride is sprayed on the roads to prevent slippage, and this calcium chloride spills on the electric pole when the vehicle is in operation. The strength of the concrete pole of the concrete material is neutralized due to the salting, the reinforcing bars installed for reinforcement are corroded inside, the cracks of the electric pole due to the expansion due to the corrosion of the reinforcing bars are deepened, Lt; / RTI > The corrosion is further increased by oxygen and ultraviolet penetration into the crack part of the electric pole.

In order to prevent the corrosion of the concrete material, a method of forming a coating on the surface by using a paint such as an epoxy system, a vinyl ester system, a fluororesin system or a urethane system has been developed. However, such a coating has a problem that its function is deteriorated over time, and deformation characteristics such as elongation and the like are different from concrete structures, thereby reducing adhesion.

Korean Patent No. 10-0947014 discloses a construction method in which a concrete surface is coated with a permeable primer made of an epoxy material and then treated with a composition containing an acrylic urethane resin to suppress the neutralization of the concrete and increase the durability . However, such a problem still remains in such a construction.

On the other hand, when the nighttime or rainy weather is low visibility and various accidents, the vehicle collides with the electric pole, and many clouds are generated. In this way, a safety panel with a black / yellow stripe pattern was installed on the pole.

The safety signboard is painted with a paint composition of acrylic resin, but the safety signboard is made of steel and installed after it has low adhesion. However, these safety indicating belts have caused another problem of cost increase.

In addition, illegal advertisements such as flyers were attached indiscriminately and the surface was contaminated. In order to prevent this, a method of forming irregularities or water repellent coating on the surface of the concrete surface or the safety indicator belt is used, but this also increases the installation cost. In addition, there has been a problem that the visibility is lowered due to surface contamination and the function as a safety indication is lost.

These problems are the same for all concrete structures on roads and roads, such as the bottom of a bridge on a road, a concrete barrier wall, and a concrete center separator.

Korean Patent Laid-Open No. 10-2012-0010336, Published Mar. 02, 2012, Salt-bearing layered metal double layer hydroxide / polyurethane polymeric copolymer nano-fused concrete admixture Korean Patent No. 10-09470140000, 2010.03.04 Announcement, Neutralized Concrete Neutralization Suppression and Durability Enhancement Construction Method Korean Patent Laid-Open No. 10-2006-0080341, 2006. 07. 10 Published,

The present inventors have conducted various studies to solve the above problems. As a result, the inventors of the present invention have found that when a road structure equipped with a safety sign is designed to have a multi-layer structure having a specific composition at the time of construction, the surface of the structure is protected from salt corrosion and neutralization, It was installed to increase visibility and to prevent contamination.

Accordingly, it is an object of the present invention to provide a method of constructing a safety display of a road structure.

Another object of the present invention is to provide a road structure produced through the construction.

In order to accomplish the above object, the present invention provides a method for producing a waterproof acrylic resin composition, which comprises diluting a primer composition comprising a water soluble elastic acrylic resin, a pigment and an additive, coating the waterproof elastic acrylic resin on a predetermined area of a concrete structure,

Coating a water-soluble acrylic resin composition comprising a water-soluble elastic acrylic resin, a pigment, and an additive on a predetermined area of a concrete structure so as to include the primer layer to form an elastic coating layer;

Coating a retroreflective resin composition comprising a water-soluble transparent acrylic resin, a glass bead, a pigment, and an additive on the elastic coating layer to form a safety indicator pattern in which a safety indicator pattern is formed; And

And coating the entire surface of the safety marking pattern with a composition for forming a pollution preventive layer including a polysiloxane to form a pollution prevention layer.

Also, the present invention provides a road structure manufactured by the above-described construction method and having a safety mark on the outer surface of a concrete structure.

The construction method according to the present invention can prevent salting and neutralization due to calcium chloride and acid rain, thereby enhancing the durability of the road structure and showing high visibility at night and rainy days, thereby preventing collision of the vehicle. In addition, even if stains such as flyers or graffiti are caused due to the high water repellency and stain resistance of the surface, the surface can be easily cleaned or the residue can not be left, thereby maintaining a clean surface.

1 is a flow chart showing the sequence of a processing method according to the present invention.
FIG. 2 is a cross-sectional view illustrating a safety indicator according to the present invention.
3 (a) is a photograph showing the reflection performance in the dry state, and Fig. 3 (b) is a photograph showing the reflection performance in the wet state.
FIG. 4 (a) is a commercially available product, and FIG. 4 (b) is a photograph showing the reflection performance at the time of wetting after forming a yellow coating film according to the present example.
FIG. 5 (a) is a photograph showing the contamination state after the contamination preventing layer coating, and FIG. 5 (b) is a photograph showing the contamination state before the contamination preventing layer coating.
6 is a photograph showing whether or not the tape is attached after the formation of the antifouling layer.

Hereinafter, the present invention will be described in detail.

The present invention proposes a safety display construction method capable of preventing salinity and neutralization occurring in a concrete structure with a safety mark attached thereto, imparting reflection performance, and preventing adhesion of external advertisement and preventing contamination.

The concrete structure may be any of concrete made of concrete installed on the road. Specifically, it may be a lower part of a bridge, a concrete barrier, a concrete median, a pillar, a pole, a traffic light, a traffic light sign, It can be preferably a pole.

FIG. 1 is a flowchart showing a procedure of a safety indicator construction method according to the present invention, and FIG. 2 is a sectional view showing a safety indicator installed on a structure. Hereinafter, the construction method will be described in detail with reference to the drawings.

First, the contamination in the concrete structure (11) is removed and the cracks are repaired for safety marking construction.

The contamination of the concrete structure 11 is illegally stolen illegally handbills, graffiti and foreign matter, etc., which remove the deposit by using a wire brush or a grinder. If necessary, treat using a solvent and clean the cracked interior with a compressor or dry it. If the contaminants remain on the cracked interior or surface of the concrete structure 11, it is not easy to construct a safety mark that goes on in the succeeding stage, and the characteristics of the safety marking film after the construction may be deteriorated, .

Cracks in the concrete structure 11 are caused by various causes, and the repair of the cracks is performed by evaluating the size and cause of the cracks formed in the concrete structure 11, and then selecting a repair method. The specific method is not particularly limited in the present invention, and a method commonly used in this field is possible. For example, a repair agent such as concrete mortar, polyurea or polyurethane resin repair agent, or epoxy resin repair agent is used. Such crack repair can restore or enhance the strength and rigidity of the structure itself, and improve the appearance of the surface. Further, the function, water resistance, durability, etc. of the concrete structure 11 can be improved.

Next, a primer layer 21 is formed by applying a primer composition to a predetermined area of the pretreated concrete structure 11 and then drying the primer composition.

The application area is a surface on which the safety mark is formed on the outer surface of the concrete structure 11. At this time, the safety mark indicating the safety mark is located at a height visually easily recognizable by the person.

The primer composition penetrates into pores or micropores formed in the dense structure of the concrete structure (11) as a permeable material to fill voids and micropores. As a result, oxygen and ultraviolet rays are not penetrated into the reinforcing bars built in the concrete structure 11, thereby preventing the corrosion of the reinforcing bars and preventing the corrosion of the reinforcing bars. In addition, the primer layer 21 hides the hue of a specific color of the concrete structure 11, enhances the color appearance of the safety mark to be applied, and smoothly coarsens the rough surface of the surface of the concrete structure 11 .

In the present invention, the primer composition uses the same material as the subsequent elastic coating layer 22, and forms the primer layer 21 through coating of the primer composition. When the primer layer 21 is made of a material having low compatibility with or different from the material of the elastic coating layer 22, the layer separation with the elastic coating layer 22 may occur or the time may elapse There is a possibility that tallies may occur. By using the same material, the adhesive strength to the elastic coating layer 22 can be increased.

At this time, the primer composition is diluted to a concentration of 10 to 20% by weight by adding a solvent, that is, water, as a diluent to a composition for an elastic coating layer prepared in advance in order to facilitate penetration into the concrete structure 11. Therefore, the composition used for forming the elastic coating layer 22 can be applied as it is without preparation of a separate primer composition, which simplifies the process, and is advantageous in comparison with the case of using different types in terms of workability and cost.

A conventional coating method of the primer layer 21 can be used. For example, an air spray method in which a paint is sprayed by mechanical air compression and an air spray method in which a direct spray method is used may be used to form a film which is usually or uniformly coated with a brush, roller, or knife coater. The coating is preferably carried out once and, if necessary, can be carried out more than once.

Next, the water-soluble acrylic resin composition is coated on the surface of the concrete structure 11 on which the primer layer 21 is formed to form the elastic coating layer 22.

The elastic coating film layer 22 is formed for the purpose of preventing salting due to calcium chloride and acid rain, and for preventing the neutralization of concrete. For this purpose, the elastic coating layer 22 should have high adhesion to dense coating and concrete materials to protect against calcium chloride and acid rain, and to prevent the penetration of external environment (such as carbon dioxide) Together, it is advantageous to have a high elongation so as to have a capability of coping with minute cracks.

Specifically, the elastic coating layer 22 according to the present invention satisfies the following physical properties specified in KS F 4936 concrete protection coating material.

- Chloride ion penetration resistance: 1,000 Coulombs or less

- Neutralization penetration depth: 1.0 mm or less

- Bond strength with concrete: 1N / m ² or more

- elongation: 50 to 400%

Chloride ion penetration resistance is a measurement method that can confirm the internal environment of concrete. It relates to fixation, adsorption and migration of salt due to penetration and diffusion of moisture in concrete pore. The higher the ion concentration, the higher the risk of corrosion of reinforcing steel Which means that the speed increases. The chloride ion penetration is inhibited by the elastic coating layer 22, and the chloride ion penetration resistance is controlled to be 1,000 Coulombs or less. At this time, if the numerical value exceeds 1,000 Coulombs, the above-mentioned effect can not be secured.

The depth of neutralization penetration is a measurement method that can confirm the internal environment of concrete. The deeper the neutralization depth, the higher the risk of corrosion of reinforcing steel and the greater the cracking of concrete, and the parameter directly related to the durability and the remaining life of the structure . Thus, in the present invention, the neutralization depth is controlled to be 1.0 mm or less through the formation of the elastic coating layer 22. At this time, if the numerical value exceeds 1.0 mm, the above-mentioned effect can not be secured.

Since the adhesion strength to the concrete is not significant if it is not adhered even if it has excellent performance, the elastic coating layer 22 should have high adhesion strength to the concrete. In the figures can not be allocated in the above-described effect with 1N / m ² or more, that is if the value 1N / m is less than ^2.

A high elongation is required for forming the coating film together with the above adhesion strength. The concrete is shrinkable and expanded due to external changes such as temperature, and the elastic coating layer (22) must have elasticity in order to obtain high responsiveness to the contraction and expansion. The stretchability can be expressed by the elongation. If the numerical value is less than 50%, there is a fear that the coating film may crack against the change in the external temperature. On the other hand, when the value exceeds 400%, the strength is lowered to tear the coating film.

In order to satisfy the physical properties described above, the elastic coating layer 22 according to the present invention is made of a water-soluble acrylic resin composition, and the water-soluble acrylic resin composition includes an aqueous acrylic resin, a pigment, and an additive.

The water-dispersed acrylic resin has an advantage of excellent adhesion strength and elongation to the concrete material, and has an advantage that it can improve weatherability (property to maintain property for a long time), chemical resistance and color retentivity. Among them, in the present invention, a water-soluble acrylic resin having elasticity is used to satisfy the above properties.

The water-dispersed acrylic resin is prepared by emulsion polymerization of an acrylic monomer and / or an acrylic oligomer and can be directly manufactured or commercially available.

As the acrylic monomer, acrylic monomers containing a hydroxyl group having a very good hydrophilicity, acrylic monomers having a carboxyl group, and amide acrylic monomers may be used.

Examples of the monomer having a hydroxyl group include one or two members selected from the group consisting of 2-hydroxyacrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, hydroxypropyl acrylate, and hydroxypropyl methacrylate. .

The acrylic monomer having a carboxyl group is selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, and maleic acid.

The amide-based monomer may be selected from the group consisting of acrylamide, N-methylol acrylamide, diacetone acrylamide, and glycidyl methacrylate monomers.

In addition, the crosslinking monomer may be selected from the group consisting of aryl acrylate, aryl methacrylate, ethylene glycol dimethacrylate, ethylene glycol diacrylate, 1,6-hexanediol diacrylate, 1,6-hexanediol dimethacrylate, diaryl It is possible to use at least one selected from phthalate, tripropylene glycol dimethacrylate, trimethylol propane, and trimethacrylate. Examples of other structural monomers include at least one selected from styrene, vinyl toluene, methyl styrene, ethylene, butadiene, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile, alkyl acrylate, and alkyl methacrylate Can be used.

The emulsion polymerization is not particularly limited in the present invention, and a known method is possible. For example, the acrylic monomer, the polymerization initiator, and the surfactant may be added to water and heat may be applied.

The content of the acrylic resin particles, that is, the ratio of the solid content may be 35 to 45%, for example, 40 to 43% based on 100% by weight of the water-dispersible acrylic resin. At this time, the ratio (content) of the solid content can be measured in accordance with DIN EN ISO 3219 / A.3. The content (content) of the hydroxyl group (OH) contained in the solid content may be 3 to 7%, and may be, for example, 4.5 to 5%.

The water-dispersed acrylic resin may have a viscosity of 2,000 to 3,500 mPa · s at 23 ° C and a pH of 7 to 8.5 (for example, 7.2 to 8.2). The water-dispersed acrylic resin may have an equivalent weight of 800 to 850 g / mol based on the hydroxyl group, a density of 1.01 to 1.09 g / mL at 20 DEG C, an acid value of 9.1 to 9.6 mgKOH / g.

Since the water-dispersed acrylic resin has a relatively high proportion of hydroxyl groups, it can exhibit high crosslinking density due to its excellent reactivity with a curing agent. Accordingly, the present invention can provide an excellent coating film having high adhesion strength and elongation to concrete have.

The water-dispersed acrylic resin may be 20 to 70% by weight, preferably 30 to 60% by weight so that the total amount of the water-soluble acrylic resin composition is 100% by weight. When the content of the water-dispersed acrylic resin is less than the above range, adhesion of the coating film, durability and the like may be deteriorated. On the contrary, if the content exceeds the above range, the composition of the composition and the water resistance of the coating film may be deteriorated.

The water-dispersed acrylic resin obtained through emulsion polymerization shows a milky white color, and various pigments can be used for color development. Preferably, to ensure non-toxicity and environmental friendliness, pigments containing heavy metals exclude their use. As a specific example, in the case of white, a white pigment such as titanium dioxide can be preferably used.

The content of such a pigment may be 5 to 30 wt%, preferably 10 to 25 wt%, so that the total amount of the water-soluble acrylic resin composition satisfies 100 wt%. If the content of the pigment is less than the above range, the hiding power of the material may be lowered. On the other hand, if the content exceeds the above range, the adhesion of the coating film may be deteriorated.

The additive may further include at least one of a hardener, a dispersant, a thickener, a defoamer, a plasticizer, a surfactant, a pH adjuster, a cryoprotectant, an antiseptic, a leveling agent and a UV stabilizer. , Preferably 0.01 to 20% by weight, and more preferably 0.5 to 15% by weight, so as to satisfy the weight%.

The curing agent reacts with the water-dispersed acrylic resin to form a urethane bond. As the curing agent, an isocyanate curing agent may be used. Examples of the isocyanate curing agent include hexamethylene diisocyanate (HDI), hexamethylene diisocyanate trimer (HDT), isophorone diisocyanate (IPDI), cyclohexyl methane diisocyanate (H12MDI), methylene diphenyl diisocyanate MDI), toluene diisocyanate (TDI), or a mixture thereof.

The dispersant is used for uniformly dispersing the pigment in the water-soluble acrylic resin composition to form a uniformly colored coating film, which has the effect of improving the visual effect and hiding power of the coating film and affecting the storage stability of the composition. Examples of usable dispersing agents include anionic dispersants (for example, polycarboxylic acids, polycarboxylic acid amines, polycarboxylic acid amine salts, polycarboxylic acid sodium salts and the like), cationic dispersants, amphoteric dispersants, Nonionic dispersants (for example, fluorine-based surfactants), and mixtures thereof.

The thickening agent is used for preventing sedimentation of the pigment in the water-soluble acrylic resin composition and improving the workability at the time of coating. In the present invention, any one selected from among bentonite, urethane and acrylic can be used. The thickening agent is added to prevent fine cracks from occurring after the coating film is formed. Examples of the thickening agent include Natrazol, CMC (Carboxy Methyl Cellulose, Carboxymethylcellulose), MC (Methylcellulose , Methylcellulose), hydroxyethylcellulose, ethylhydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, or a mixture thereof.

The antifoaming agent is for suppressing bubbles in the water-soluble acrylic resin composition to form a uniform coating film. In the present invention, any one selected from a nonionic system and a silicone resin can be used.

The plasticizer is used to prevent cracking of the coating film in the winter season, and a trimethylpropanol-based plasticizer, a phthalate-based plasticizer and the like can be used, and a trimethylpropanol-based plasticizer having excellent stability is preferably used. In addition, it is possible to prevent the coating film from cracking during the winter season by additionally including a cryoprotectant, and furthermore, the preservation stability can be improved by further including a preservative

The pH adjusting agent serves to improve the storage stability of the composition. Examples of usable pH adjusting agents include ammonia water, monoethanolamine, diethanolamine, triethanolamine, 1-amino-2-methylpropane, 2-amino-2-methylpropane and triethylamine.

The leveling agent serves to improve the smoothness of the coating film. Examples of such leveling agents include polyacrylate copolymers and polyether siloxane-based compounds.

The water-soluble acrylic resin composition for forming the elastic coating layer 22 of the present invention including the above-mentioned composition forms a suitable coating film and controls the pH, viscosity and pigment volume ratio to ensure high storage stability.

Preferably, the water-soluble acrylic resin composition has a pH range of 7 to 9.5, preferably 8 to 9. If the pH is less than the above range, a phenomenon such as layer separation or sedimentation may occur during storage of the composition. Conversely, if the pH is in excess of the above range, the viscosity may be excessively increased and the coating operation may be difficult.

In addition, the water-soluble acrylic resin composition according to the present invention has a viscosity of 5,000 to 50,000 cps. If the viscosity is less than 5,000 cps, it is difficult to form a uniform coating film on the vertical wall, and when the viscosity is more than 50,000 cps, the viscosity is too high to perform the coating operation. The residual bubbles are not removed and the durability may be deteriorated. More specifically, the viscosity of the composition is preferably 10,000 to 30,000 cps.

In particular, the water-soluble acrylic resin composition of the present invention preferably has a pigment volume ratio of 15 to 35% by weight. Pigment volume content (PVC) refers to the volume occupied by a binder (resin) component in a viscous body such as a pigment or ink, that is, the volume ratio of the pigment therein, that is, the percentage of the pigment due to the volume in the dried coating film . The pigment volume ratio is closely related to the strength, elasticity (i.e., elongation) and shading rate of the coating film. As the content of the pigment in the film increases, the pigment volume ratio rises and the strength and elasticity of the film increase, but at a certain point, it decreases rapidly. Also, as the pigment content increases, the viscosity increases, but too high viscosity degrades the workability. Accordingly, when the pigment volume ratio is within the above range, physical properties of the coating film can be optimized.

A conventional coating method of the elastic coating layer 22 may be used. For example, an air spray method in which a paint is sprayed by mechanical air compression and an air spray method in which a direct spray method is used may be used to form a film which is usually or uniformly coated with a brush, roller, or knife coater.

When painting is completed, sufficient drying and curing time is given, and when working in a cold place (winter) or winter (below 5 ℃), drying and curing time can be shortened by using a hot air fan.

The thickness of the obtained elastic coating layer 22 is about 50 to 500 占 퐉 in the cured coating film, and is preferably in the range of 100 to 500 占 퐉. If the thickness is less than the above range, the physical properties are deteriorated or microcracks are generated due to the internal and external environments, and even if the microcracks are generated, the correspondence is lowered. On the other hand, when the amount exceeds the above range, it takes a long time to cure or partial hardening or incompletely hardening occurs and it is difficult to use as a coating film.

Next, a safety indicator pattern 23 is formed on the elastic coating layer 22 by coating with a retroreflective resin composition.

Retroreflection is the reflection of incident light back to the light source, and reflects the light in the direction of the light source even if the light is reflected by the retroreflective material at any angle. The coating film capable of causing the retroreflection includes the retroreflective material, and the coating film has high visibility, especially at night visibility. In addition, high visibility can be ensured even when there is no visibility due to the water film formed by rainwater at the time of rainy weather.

For the sake of safety, the safety indication pattern 23 is a sign for informing road users of various contents such as attention, regulations, and instructions in symbols, letters or lines, and has a specific pattern, image, text or pictogram. For example, in the case of a pole, it may be formed in an inclined stripe shape. In the case of other structures, it may be an image, text or pictogram indicating resident priority parking area, parking prohibition, emergency bell, security reinforcement map, living manners guide, direction instruction mark,

The safety indication pattern 23 is preferably high in luminance contrast for visibility, and can be achieved by increasing the retroreflectivity (or the retroreflectivity). The retroreflectivity is directly influenced by the refractive index of the retroreflective material, i.e., the glass bead, which causes retroreflection.

Glass beads with a refractive index of 1.5, which is widely used as a coating composition, have a focus of rays outside the glass beads, which may have the highest retroreflectivity when a part of the glass beads is immersed in the coating. Further, the glass bead having a refractive index of 1.9 has a high retroreflectivity alone because the focus is formed inside the glass bead. This is called an airport bead because it is used in an open lens type or airport requiring high brightness.

As already mentioned, the recurrence reflectivity depends on the refractive index of the glass bead. That is, in the case of conventional glass beads having a refractive index of 1.5, the diffuse reflection efficiency and the retroreflective light amount are increased when the glass beads are buried at about 60%, thereby increasing the retroreflective efficiency. Also, it shows the most effective retroreflective performance when the refractive index is 1.9 and the refractive index is 2.2 and 30%, respectively. However, as the embedding ratio becomes lower, the glass bead releasability becomes higher. Therefore, it is necessary to consider the glass bead fixing rate together with the retroreflectivity. In the present invention, a glass bead having a refractive index of 1.7 or more is used in order to ensure a high retroreflectivity.

By having such a high retroreflectivity, the safety indication pattern 23 of the present invention can secure a high effect of 'wetting reflectivity', which exhibits high reflectivity even under the atmosphere of snow, rain or mist. As a result, it is possible to realize high reflection performance by the light of the vehicle even at night when it rains.

Conventionally, a safety display pattern using glass beads is not a method of forming a pattern after dispersing glass beads in a resin composition, but generally, a glass bead is sprayed after coating a retroreflective resin composition to form a coating film. This is because the dispersibility of the glass beads in the resin composition is low, so that when the coating film is formed of a composition containing glass beads, the retroreflectivity of the coating film varies depending on the position of the film, resulting in a decrease in the retroreflectivity. Therefore, it is possible to ensure a uniform retroreflectivity by spraying only the glass beads. This method can be applied on the flat surface such as the road surface. However, if it is performed on the vertical surface such as the electric pole, adhesion of the glass bead to the coating film is low and secondary accident due to the lost glass may occur. In the present invention, it is possible to perform a method of forming a coating film by incorporating a glass bead having a specific composition of an acrylic resin and a glass bead having a limited particle size in a composition, instead of spraying the glass bead separately.

Preferably, the retroreflective material may be 1 to 20% by weight, preferably 5 to 15% by weight, so that the total amount of the retroreflective resin composition satisfies 100% by weight. If the content is less than the above range, sufficient retroreflective effect can not be exhibited. On the other hand, if the content is included in the above range, precipitation may occur in the composition and uniform coating film formation may become difficult.

The resin used in the retroreflective resin composition is a water-soluble transparent acrylic resin having the same material as that of the previous elastic coating layer 22, and has a high adhesion to the elastic coating layer 22 by using the same or similar materials.

The water-soluble transparent acrylic resin is preferably a transparent resin having high light transmittance so as not to cancel out the refractive index of the glass beads. For example, a resin having a transmittance of 80%, preferably 90%, more preferably 95% or more is possible.

In one example, the water-soluble transparent acrylic resin is a copolymer of a C ₁ to C ₁₂ alkyl (meth) acrylate, a C ₃ to C ₁₂ cycloalkyl (meth) acrylate, and a C ₆ to C ₁₂ bicycloalkyl (meth) Lt; / RTI >

More specifically, the acrylic monomer used in the water-soluble transparent acrylic resin is at least one monomer selected from the group consisting of methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isobutyl (meth) acrylate, (Meth) acrylate, n-hexyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (Meth) acrylate. Preferably, it is methyl (meth) acrylate, which may be polymethyl methacrylate (PMMA) alone or copolymers of methyl methacrylate-butyl acrylate. Wherein the (meth) acrylate comprises both acrylate and methacrylate.

However, the water-soluble transparent acrylic resin may be a transparent color acrylic resin which is not milky white in order to form a safety mark.

Preferably, the water-soluble transparent acrylic resin may be 20 to 70 wt%, preferably 30 to 60 wt%, so that the total amount of the retroreflective resin composition satisfies 100 wt%. If the content of the water-soluble transparent acrylic resin is less than the above range, the adhesion of the safety marking pattern 23, durability and the like may be deteriorated. On the other hand, The water resistance and the like may be lowered.

The glass beads, which are retroreflective materials used in the present invention, should be limited in size in order to ensure dispersion stability together with the refractive index. Preferably, when the glass beads have an average particle diameter of 50 to 200 mu m, a high reflectivity can be secured. If the size is too small, agglomeration may occur between the glass beads. If it is too large, precipitation may occur and the glass may not uniformly disperse throughout the coating film of the safety indicating pattern 23 and the overall retroreflectivity may be lowered .

If necessary, the glass beads may be coated with a retroreflective enhancement material such as monosilane.

The retroreflective resin composition of the present invention comprises a water-soluble transparent acrylic resin and a glass bead, and includes various pigments and additives for forming the safety marking pattern (23).

The pigment can be selected variously according to the type and shape of various pattern images, texts, pictograms, etc. formed in the safety indication pattern 23 of the structure.

For example, in the case of a pole, safety marks are formed in a spiral stripe pattern of black and yellow for safety and clarity. At this time, yellow paint is applied and black paint is applied.

The pigments of the safety marking pattern (23) for yellow painting are mixed with metallic pigments such as metallic gold and metallic silver. The metallic pigment is made to give a metal-like effect to the substrate. The metallic pigment shows yellow color and the metallic black powder shows white color.

The pigments of the safety indicator pattern 23 for black coating can be carbon black, iron black, lamp black, acetylene black, or the like. In addition, yellow pigments such as yellow pigment (yellow iron oxide, yellowish yellow, benzidine yellow, permanent yellow), red pigments (red iron oxide, permanent red, rake red, bordeaux red, quinacridone red pigments) Green pigments (chrome green, pigment green, phthalocyanine green, etc.), metallic pigments such as cobalt blue, cobalt blue, manganese blue, and first violet B; blue pigments such as cyanite, cobalt blue, and phthalocyanine blue; Pigments (aluminum paste, aluminum flakes, etc.) are available, and they may be used alone or in combination of two or more.

The additive may further include at least one of a curing agent, a dispersing agent, a thickener, a defoaming agent, a plasticizer, a surfactant, a pH adjuster, a cryoprotectant, an antiseptic, a leveling agent and a UV stabilizer as mentioned in the elastic coating layer 22 , And they may be contained in an amount of 0.01 to 20% by weight, preferably 0.5 to 15% by weight, within 100% by weight of the total amount of the above recursive reflective resin composition.

In addition, the retroreflective resin composition of the present invention has a viscosity of 5,000 to 50,000 cps. If the viscosity is less than 5,000 cps, it is difficult to form a uniform coating film on the vertical wall, and when the viscosity is more than 50,000 cps, the viscosity is too high to perform the coating operation. The residual bubbles are not removed and the durability may be deteriorated. More specifically, the viscosity of the composition is preferably 10,000 to 30,000 cps.

The formation of the safety indicator pattern 23 using the recursive reflective resin composition can be achieved by an air spraying method in which a paint is sprayed by mechanical air compression to form a coating film with a brush, a roller or a knife coater, Airless spraying may be used. The coating is preferably carried out once and, if necessary, can be carried out more than once.

Particularly, in the case of the electric pole such as the black and yellow spiral stripe pattern, the safety mark performs the painting as follows.

First, a composition comprising 25 to 50% by weight of glass beads, 1 to 10% by weight of metallic gold, 1 to 10% by weight of metallic silver powder, 30 to 70% by weight of water-soluble transparent acrylic resin and 1 to 10% , And the entire surface of the elastic coating layer 22 is coated to form a retroreflective coating film showing yellow color.

Next, a composition comprising 7 to 30% by weight of carbon black, 60 to 90% by weight of a water-soluble transparent acrylic resin and 1 to 10% by weight of an additive is prepared and then a predetermined area of the yellow retroreflective coating, And is coated on a predetermined region for forming a stripe.

The thickness of the obtained safety indicating pattern 23 is about 5 to 100 占 퐉 in the cured coating film, and is preferably in the range of 20 to 50 占 퐉. If the thickness is less than the above range, the glass beads may escape or fall out into the coating film, and conversely, the retroreflective performance caused by the glass beads exceeding the above range may be deteriorated.

Next, the antifouling layer 24 is formed on the safety indicator pattern 23 by coating with a composition containing polysiloxane.

The contaminated waterproof layer is hydrophobic (related to water repellency and detonation ability) so that the performance of the safety indicator pattern 23 is maintained for a long time. When the surface of the coating film is sprayed with rainwater containing muddy water, calcium chloride solution or fine dust, And can immediately flow down without pollution. As a result, it always maintains a clean coat.

Hydrophobicity can be predicted by measuring the contact angle, which means that the larger the contact angle, the greater the hydrophobicity. Preferably, the contaminant waterproof layer of the present invention has a contact angle of 100 DEG C or higher, and it is possible to ensure adequate water-repellency and repellency. If the contact angle is less than the above range, the above-mentioned muddy water or the like may easily penetrate and the contamination may be difficult to remove.

In the present invention, the composition for forming an antifouling layer 24 for forming the antifouling layer 24 uses a polysiloxane capable of forming a transparent film as the antifouling layer 24 so as to ensure a contact angle of 100 degrees or more, Solvent for the process (e. G., Water).

The polysiloxane may be selected from the group consisting of polypentasiloxane, cyclopentasiloxane, polydisiloxane, polydimethylsiloxane, OH end-blocked polydimethylsiloxane, polymethylphenylsiloxane, polydiphenylsiloxane, polyfluorosiloxane, And a combination thereof.

The polysiloxane has water-repellent, water-repellent properties, and is releasable to easily remove an illegal deposit due to its low surface tension. In addition, heat resistance, chemical stability, electrical insulation, abrasion resistance, weather resistance, ozone resistance and the like are excellent due to the inorganic property generated from silicon oxide (SiO ₂ ) due to the siloxane bond (Si-O) as the main chain. The siloxane resin may have a siloxane unit (-OSi (R) ₂ -) of 2 to 1,000, preferably 10 to 200.

The polysiloxane is used as it is or dissolved or dispersed in water or an organic solvent. For example, a product in which OH-terminated polydimethylsiloxane is encapsulated in 80% of water can be used.

In addition, the composition for forming the antifouling layer may use a catalyst for increasing the crosslinking rate of the polysiloxane, wherein the catalyst may be a catalyst such as platinum. The specific composition is not particularly limited in the present invention and may be a catalyst known in the field such as platinum, rhodium, ruthenium, palladium, osmium and iridium.

In addition, the composition for forming an antifouling layer may further comprise a substance capable of crosslinking with the polysiloxane. For example, one or more selected from vinylsilane-based compounds or epoxy silane-based compounds may be further prepared. Specific examples of the vinylsilane-based compound or the epoxy silane-based compound include? -Glycidyloxypropyltrialkoxysilane such as? -Glycidyloxypropyltriethoxysilane or? -Glycidyloxypropyl Trimethoxysilane; ? -glycidoxypropyltrialkoxysilane, such as? -glycidoxypropyltriethoxysilane or? -glycidoxypropyltrimethoxysilane; ? -methacryloxypropyltrialkoxysilane, such as? -methacryloxypropyltrimethoxysilane, or? -methacryloxypropyltriethoxysilane; Vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, vinyltriethoxysilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy) silane, ) Silane, 3-acryloxypropyltrimethoxysilane, but is not limited thereto. More specific examples include silkest A-186 silane of Momentive, silquest A-187 Silane, and the like.

The above-described coating method of the antifouling layer 24 according to the present invention can be used. At this time, the composition for forming the antifouling layer has a viscosity of 5,000 to 50,000 cps. These viscosities are designed in consideration of workability and physical properties (water repellency, stain resistance, durability, etc.) of the finally obtained coating, and two or more paintings can be performed when working with a low viscosity. Preferably, it is advantageous in terms of workability to perform the same painting operation as the previous films.

The thickness of the obtained antifouling layer 24 is about 0.5 to 10 mu m in a thin coating layer, and is preferably in the range of 1 to 5 mu m. If the thickness is less than the above range, there is no effect of preventing contamination. On the other hand, if the thickness is over the above range, cracks may occur.

The road structure produced by the construction method described above has a safety indication pattern 23 formed on its surface.

Especially, in the case of the safety indicator pattern of the electric pole, a spiral stripe pattern composed of black / yellow is formed, which is formed at a position where the human can visually distinguish easily.

The safety display pattern effectively prevents chlorination and neutralization due to calcium chloride and acid rain, thereby enhancing the durability of the electric pole, that is, the service life. Also, due to the application of the retroreflective material, it is possible to prevent the collision of the vehicle with high visibility at night and rainy days. In addition, due to the high water repellency and stain resistance of the surface, even if stains such as leaflets or graffiti are generated, the surface can be easily cleaned or no residue is left, thus maintaining a clean surface.

[Example]

Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the scope of the present invention is not limited to the following examples. Here,% by weight means the content of solid content.

Experimental Example 1: Construction of Safety Indication Pattern and Property Analysis

(1) Preparation of primer layer and water-soluble acrylic resin composition

The water-soluble acrylic resin composition was injected into a mixer with water-dispersed acrylic urethane resin (Mapei Elastocolor paint, EN-1504-9, pH 8.5, viscosity 16,000 cps, pigment volume 20 wt%) and water was added thereto to prepare a primer composition .

The water-dispersed acrylic urethane resin (Mapei Elastocolor paint, EN-1504-9, pH 8.5, viscosity 16,000 cps, pigment volume 20% by weight) was used for the formation of the elastic coating layer. In the following examples and comparative examples, the pH and viscosity of the water-soluble acrylic resin composition were adjusted by adding a pH adjusting agent and a viscosity adjusting agent.

(2) Production of retroreflective resin composition

To the mixer, a retroreflective resin composition for a yellow pattern was prepared by adding 60 wt% of RETROREFLECTIVE MASTER, 30 wt% of glass beads, 5 wt% of gold powder, and 5 wt% of silver powder.

To the other mixer, 90 wt% of RETROREFLECTIVE MASTER and 10 wt% of carbon black were added to prepare a retroreflective resin composition for black pattern.

(3) Preparation of antifouling layer composition

Polysiloxane (Water repellent coating agent [SI6500Z], KCS Co.) was purchased and used.

(4) Construction

The surface of concrete was washed with water using a brush and dried for 1 hour at room temperature.

The primer composition was applied to the surface of the concrete by a brush and then dried for 30 minutes to form a primer layer.

Next, a water-soluble acrylic resin composition was applied onto the primer layer with a brush and then dried at room temperature for 1 hour to form an elastic coating layer.

Next, the yellow safety marking pattern composition was sprayed on the elastic coating layer by a spray gun and dried at room temperature for 1 hour. Then, the black safety marking pattern composition was sprayed with a spray gun only in a predetermined area so as to form a certain pattern, and dried at room temperature for 1 hour.

Next, the antifouling layer composition was sprayed with a spray gun to form an antifouling layer.

The physical properties of the respective layers were measured on the basis of the following criteria, and the results obtained are shown in Table 1.

division Item Test Methods Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 receptivity
Elastic acrylic number pH 25 ℃ 8.11 8.41 8.73 8.92 7.40 9.47 8.73 8.73 Viscosity (cps) 25 ℃ 13,100 19,600 23,400 28,900 5,900 67,700 23,400 23,400 Water-soluble transparent acrylic retroreflective composition Glass bead refractive index - 1.77 1.77 1.77 1.77 1.77 1.77 1.77 1.77 Glass bulb diameter (탆) - 100 100 100 100 100 100 40 250 Properties Neutralization Depth (mm) KS F 4936 0.55 0.61 0.48 0.72 3.78 1.01 0.97 0.82 Chloride ion penetration resistance
(Coulombs) KS F 4936 771 786 728 814 1,283 1,374 981 867 Bond strength (N / mm2) KS F 4937 1.75 1.63 1.60 1.43 1.58 0.47 1.52 0.31 Reflective performance at wet KS M 6080 Good Good Good Good Good Good Bad Bad Crack Resistance KS F 4937 Good Good Good Good Good Good Good Bad

As shown in Table 1, when the pH and viscosity of the acrylic resin composition forming the elastic coating layer are within a specific range as in Examples 1 to 4, they satisfy the neutralization depth standard and exhibit excellent chloride ion penetration resistance .

In contrast, in Comparative Example 1, when the elastic coating layer was formed using a composition having a low viscosity, the physical properties such as the depth of neutralization were generally poor. In contrast, the composition of Comparative Example 2, which had a high viscosity, was highly resistant to chloride ion penetration, and the damage caused by the chloride attack was great.

On the other hand, when the glass beads having an average particle diameter of 100 탆 were used as the compositions of Examples 1 to 4, the retroreflective performance was confirmed to be good in the case of the reflection performance during wetting related to the reflexibility. In comparison, when the average particle size is small or large as in Comparative Example 3 and Comparative Example 4, the reflection performance is poor in drying and wetting.

FIG. 3 is a photograph related to the reflection performance of the specimen constructed by the above-described method when wet. Fig. 3 (a) is a photograph showing the reflection performance in the dry state, and Fig. 3 (b) is a photograph showing the reflection performance when wet. 3 (a) and 3 (b), it can be seen that the concrete material produced according to the present invention maintains excellent reflection performance even in the wet state.

This difference was also significant when compared with commercial products. As a commercially available product, a yellow pattern was formed using water soluble ksm6080-5 species + ksl2521 (manufactured by KC CCS).

FIG. 4 (a) is a commercial product, and FIG. 4 (b) is a photograph showing the reflection performance at the time of wetting after forming a yellow coating film according to the present example. Referring to FIGS. 4 (a) and 4 (b), it can be seen that, in case of a commercial product, the reflection performance during wetting is significantly lowered compared to the construction method according to the present experimental example.

FIG. 5 (a) is a photograph showing the contamination state after the contamination preventing layer coating, and FIG. 5 (b) is a photograph showing the contamination state before the contamination preventing layer coating. Referring to FIG. 5 (a), it can be seen that the clean coating is maintained by removing contaminants after coating the antifouling layer according to the present invention. However, when the contamination preventing layer is not formed as shown in FIG. 5 (b), it can be seen that the contaminant remains as it is.

FIG. 6 is a photograph showing whether or not the tape is attached after the formation of the antifouling layer. As shown in FIG. 6 (a), even if the tape is attached and removed as shown in FIG. 6 (b) Able to know.

Experimental Example 2: Analysis of contact angle change according to whether or not a contaminant prevention layer was formed

The contact angle was measured by using a contact angle meter to check the water repellency and antifouling performance according to the presence or absence of the contaminant prevention layer.

The contact angle was measured by applying a yellow retroreflective resin composition of Example 1 on a glass substrate to obtain a coating film having a thickness of 50 mu m and a polysiloxane of an antifouling layer on the coating film to obtain a coating film having a thickness of 10 mu m. At this time, as a control group, a film coated with only the recursive reflective resin composition was used.

Retroreflective coating Retroreflective coating / anti-fouling layer Contact angle 65 degrees 102 degrees

Referring to Table 2, it was confirmed that the contact angle of the surface was increased by forming the antifouling layer, thereby preventing contamination from the outside and having a water-repellent ability.

The construction method according to the present invention can be applied to the safety indication of a road structure including a pole.

11: Concrete structure
21: Primer layer
22: Elastic coating layer
23: Safety indication pattern
24: Contamination prevention layer

Claims (6)

A method of constructing a safety indicator for a road structure having a neutralization and anti-
Forming a primer layer by infiltrating a primer composition diluted by adding water to a water-soluble acrylic resin composition comprising a water-dispersible acrylic resin, a pigment, and an additive, into a surface;
Coating a water-soluble acrylic resin composition containing the water-dispersed acrylic resin, a pigment, and an additive on a predetermined region of the road structure so as to include the primer layer to form an elastic coating layer;
Coating a retroreflective resin composition comprising a water-soluble transparent acrylic resin having a light transmittance of 95% or more, a retroreflective material, a pigment, and an additive on the elastic coating layer to form a safety marking pattern; And
Coating a composition for forming an antifouling layer containing a polysiloxane on the entire surface of the safety marking pattern to form an antifouling layer,
The water-soluble acrylic resin composition contains 30 to 60% by weight of water-dispersed acrylic resin, 10 to 25% by weight of pigment, and 0.5 to 15% by weight of an additive so that the total amount of the composition satisfies 100% Wherein the water-soluble acrylic resin composition has a pH of 7 to 9.5, a viscosity of 10,000 to 30,000 cps, a pigment volume of 15 to 30,000 cps, at least one pigment selected from the group consisting of a thickener, a defoaming agent, a plasticizer, a surfactant, a pH adjuster, a cryoprotectant, a preservative, 35% by weight,
The composition for forming an antifouling layer comprising the polysiloxane is characterized in that the polysiloxane is dissolved or dispersed in water or an organic solvent and has a viscosity of 5,000 to 50,000 cps and a thickness of the antifouling layer is 0.5 to 10 μm. How to construct the safety mark of. The method according to claim 1,
Wherein the elastic coating layer has a neutralization depth of 1.0 mm or less, a chloride ion penetration resistance of 1,000 Coulombs or less, an adhesion strength to concrete of 1 N / m ² or more, and an elongation of 50 to 50%, as specified in KS F 4936 concrete protective coating material, A method of constructing a safety mark for a road structure, which is an elastic coating of 400%. The method according to claim 1,
Wherein the water-dispersed acrylic resin has a viscosity at 23 ° C of 2,000 to 3,500 mPa · s, a pH of 7 to 8.5, and an equivalent weight of 800 to 850 g / mol based on hydroxyl groups. The method according to claim 1,
Wherein the retroreflective material is a glass bead having a refractive index of 1.7 or more and an average particle size of 50 to 200 占 퐉. The method according to claim 1,
Wherein the contamination preventing layer has a contact angle of 100 degrees or more. A method for producing a steel sheet, which is manufactured by the method of any one of claims 1 to 5,
A road structure with a safety sign pattern.

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