KR101752090B1

KR101752090B1 - Eco-friendly paint coating compositions for durability improvement of concrete structure and steel structure and painting construction method using the same

Info

Publication number: KR101752090B1
Application number: KR1020160026811A
Authority: KR
Inventors: 정은숙
Original assignee: 정은숙; 주식회사 다유
Priority date: 2016-03-07
Filing date: 2016-03-07
Publication date: 2017-06-28

Abstract

The present invention relates to a concrete composition and a steel structure comprising a mixture of ceramic powder, epoxy resin, urethane resin, flame retardant ABS resin, sodium oxide, silicon dioxide, dimethylpolysiloxane, calcium carbonate and aluminum hydroxide To an environmentally friendly coating composition for improving durability and a coating method using the same.
According to the present invention, by coating the surface of concrete structures and steel structures, corrosion resistance, crack resistance, bending resistance, and chemical resistance against salt are improved, and furthermore, impact resistance and abrasion resistance are excellent. And contributes to enhancement of the durability of the structure.

Description

TECHNICAL FIELD [0001] The present invention relates to an eco-friendly coating composition for improving the durability of concrete structures and steel structures, and a coating method using the eco-friendly paint coating compositions for improving the durability of concrete structures and steel structures.

The present invention relates to a coating composition and a coating method using the same, and more particularly, to a coating composition which is excellent in corrosion resistance against cracking, cracking resistance, bending resistance and chemical resistance, and which is excellent in impact resistance and abrasion resistance And an eco-friendly coating composition for enhancing the durability of a steel structure and a coating method using the eco-friendly coating composition.

Generally, a concrete structure is a concrete structure having a strong compressive strength, excellent economy and workability as its main material, and includes buildings, bridges, high-altitude roads, tunnels, and other structures.

These concrete structures have semi-permanent characteristics, but safety and durability are deteriorated due to neutralization of materials, rust of reinforcing bars, cracks due to expansion, peeling of concrete surface layer, structural defects and overloads. .

Also, in case of steel structure, which is a representative structure together with concrete structure, side effects due to various conditions are recognized as an important problem.

As a technique for preventing deterioration corresponding to a side effect of conventional concrete structures and steel structures, Korean Patent No. 10-1161348 entitled " Environmentally friendly coating composition for preventing deterioration of concrete and steel structure and its construction method " This is because the epoxy resin, vinyl ester, flame retardant ABS resin, sodium oxide, silicon dioxide, dimethylpolysiloxane, calcium carbonate and aluminum hydroxide are each contained in a predetermined weight percentage to make up 100 wt% will be.

However, the prior art is mostly composed of a resin composition, which has limitations in increasing the durability or abrasion resistance, and has a problem that the impact resistance and the like are not satisfied.

In order to solve the problems of the prior art as described above, the present invention is applied to the surface of concrete structures and steel structures to provide excellent corrosion resistance, crack resistance, bending resistance and chemical resistance against salt, And has an object of contributing to enhancement of the durability of the structure.

Other objects of the present invention will become readily apparent from the following description of the embodiments.

According to one aspect of the present invention, there is provided a coating composition for a concrete structure and a steel structure, which comprises ceramic powder, epoxy resin, urethane resin, flame retardant ABS resin, sodium oxide, silicon dioxide, dimethylpolysiloxane, There is provided an environmentally friendly coating composition for enhancing the durability of a concrete structure and a steel structure comprising a mixture of calcium carbonate and aluminum hydroxide.

Wherein the ceramic powder has a particle size of 0.1 to 100 탆 and comprises 5 to 15% by weight of the ceramic powder, 40 to 55% by weight of the epoxy resin, 7 to 25% by weight of the urethane resin, By weight of calcium hydroxide, 0.1 to 1% by weight of sodium hydroxide, 0.5 to 1% by weight of sodium oxide, 1.5 to 5% by weight of silicon dioxide, 0.1 to 1% by weight of dimethylpolysiloxane, 3 to 8% &Lt; / RTI >

The weight ratio of the carbon nanotube powder: titanium powder: epoxy resin is 100: 1 to 5: 1 to 5: 5 to 50: 1, and the carbon nanotube powder, titanium powder and epoxy resin are further mixed. .

The mixture was further mixed with a mixture of sulfuric acid, which was obtained by firing a mixture of sulfuric acid and fumed silica, and a heat-resistant soil mixed with petite powder and clay, and a tourmaline powder and an epoxy resin. The mixture was further mixed with sulfuric acid, sulfuric acid, : Epoxy resin may be 100: 1 to 5: 1 to 5: 1 to 3: 5 to 50 by weight.

According to another aspect of the present invention, there is provided a method of coating a concrete structure and a steel structure, comprising: performing a removal of contaminants on a surface of the concrete structure or the steel structure; Applying a primer to the surface after removal of the contaminant; And applying an eco-friendly coating composition according to one aspect of the present invention on a coating layer of the primer, wherein the eco-friendly coating composition for enhancing the durability of the concrete structure and the steel structure is provided.

According to the eco-friendly coating composition for enhancing the durability of the concrete structure and the steel structure according to the present invention and the coating construction method using the eco-friendly coating composition according to the present invention, by coating the surface of the concrete structure and steel structure, corrosion resistance, crack resistance, It is possible to improve the impact resistance and the abrasion resistance, thereby suppressing the occurrence of deterioration and contributing to the improvement of the durability of the structure.

1 is a flowchart illustrating a coating construction method using an environmentally friendly coating composition for enhancing the durability of a concrete structure and a steel structure according to an embodiment of the present invention.
2 is a paint structure formed by a coating method using an environmentally friendly coating composition for enhancing the durability of a concrete structure and a steel structure according to an embodiment of the present invention.

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in detail in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention, And the scope of the present invention is not limited to the following examples.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant explanations thereof will be omitted.

The eco-friendly coating composition for enhancing the durability of concrete structures and steel structures according to an embodiment of the present invention is a coating material for use in concrete structures and steel structures, and includes ceramics powder, epoxy resin, urethane resin, flame retardant ABS resin, sodium oxide, Dimethylpolysiloxane, calcium carbonate, and aluminum hydroxide. Wherein the ceramic powder has a particle size of 0.1 to 100 탆 and comprises 5 to 15% by weight of a ceramic powder, 40 to 55% by weight of an epoxy resin, 7 to 25% by weight of a urethane resin, 5 to 8% By weight of silicon dioxide, 1.5 to 5% by weight of silicon dioxide, 0.1 to 1% by weight of dimethylpolysiloxane, 3 to 8% by weight of calcium carbonate and 0.1 to 1% by weight of aluminum hydroxide.

The ceramic powder may be selected from the group consisting of Al ₂ O ₃ , SiO ₂ , TiO ₂ , ZrO ₂ , AlN, Si ₃ N ₄ , Ti ₃ N ₄ , Zr ₃ N ₄ , Al ₄ C ₃ , SiC, TiC, ZrC, AlB, Si ₃ B ₄ , Ti ₃ B ₄ , and Zr ₃ B ₄ can be used. Among them, oxides can be used. For example, Al ₂ O ₃ can be used . The ceramic powder has a particle size of from 0.1 to 100 mu m and can be contained in an amount of from 5 to 15% by weight in the entire 100% by weight of the mixture. The reason for this is that when the ceramic powder has a particle size of less than 0.1 mu m, it does not contribute to improvement in durability and abrasion resistance. When the particle size exceeds 100 mu m, not only the dispersion efficiency in the mixture is lowered, If it is less than 5% by weight, it does not contribute to the increase in durability. If it is more than 15% by weight, it is difficult to maintain a viscosity suitable for application. In addition, the particle size range of the ceramic powder as described above can be applied to all particle sizes for powders of all constituents.

The epoxy resin may be contained in an amount of 40 to 55% by weight in the total 100% by weight of the mixture. When the content of the epoxy resin is less than 40% by weight, adhesion between the concrete structure and the steel structure and the mixture is deteriorated in consideration of the content of the urethane resin. When the content of the urethane resin exceeds 55% by weight, The content of the other components except for the epoxy resin and the urethane resin is relatively reduced, so that the desired characteristics of the present invention are not sufficiently exhibited.

The urethane resin may be contained in an amount of 7 to 25% by weight, based on the entire 100% by weight of the mixture, so as not to easily peel off the mixture due to the excellent elongation as well as durability and corrosion resistance. If the content of the urethane resin is less than 7% by weight, the elongation is so small that a desired effect can not be expected. If the content of the urethane resin is more than 25% by weight, the elongation can not be improved by an expected value.

The flame-retardant ABS resin may be included in an amount of 5 to 8% by weight in the entire 100% by weight of the mixture. Flame-retardant ABS resin is an industrial plastic material made by mixing petroleum-derived chemicals and has a non-flammable function. The flame-retardant ABS resin is a styrene resin having an excellent flame retardancy by imparting self-extinguishing properties to an ABS resin, for example, excellent in tensile strength and flexural strength, excellent in gloss, excellent in resistance to impact and chemicals, It has excellent strength and excellent durability as a thin film. If the content of the flame-retardant ABS resin is less than 5% by weight, it is difficult to expect the improvement of the strength and flame retardancy of the concrete structure and the steel structure. If it exceeds 8% by weight, the flame retardancy and strength are not improved in proportion to the exceeded content, to be.

Sodium oxide may be included in 0.5 to 1% by weight of the total 100% by weight of the mixture. The silicon dioxide may also be present in an amount of 1.5 to 5% by weight of the total 100% by weight of the mixture. The reason is that sodium oxide and silicon dioxide react with each other to form sodium silicate, where the sodium oxide to silicon dioxide can achieve a weight ratio of 1: 3 to 5. Here, the silicon dioxide increases the water permeability. If the weight ratio of sodium oxide to silicon dioxide is out of the range of 1: 3 to 5, the two substances can not effectively form sodium silicate. If the content of sodium oxide is less than 0.5% by weight or the content of silicon dioxide is less than 1.5% by weight, the permeation resistance can not be exhibited properly. If the content of sodium oxide exceeds 1% by weight or the content of silicon dioxide exceeds 5% , The effect of permeability is not improved as much as the content exceeding the above range, which is inefficient.

The dimethylpolysiloxane may be included in an amount of 0.1 to 1% by weight in the total 100% by weight of the mixture. Dimethylpolysiloxane removes bubbles from concrete structures and coatings of steel structures, and it is possible to prevent the occurrence of defective coating surfaces due to bubbles. When the content of the dimethylpolysiloxane is less than 0.1% by weight, the bubble removing function is markedly deteriorated. When the content of the dimethylpolysiloxane is more than 1% by weight, the effect of bubbling is not improved.

Calcium carbonate may be included in 3 to 8% by weight of the total 100% by weight of the mixture. Calcium carbonate acts as a filling material, improves the filling rate of the coating material, and is excellent in resistance to shrinkage, so that warpage due to shrinkage of the coating material is extremely small, and it is possible to fill a high proportion, thereby contributing to improvement of the strength of the coating material . If the content of calcium carbonate is less than 3% by weight, the filling is not sufficiently performed and the strength is not improved. If the content is more than 8% by weight, the strength of the coating may decrease due to the expansion mechanism of the coating.

Aluminum hydroxide may be included in an amount of 0.1 to 1% by weight in the total 100% by weight of the mixture. The aluminum hydroxide prevents the coloring of the paint when it is exposed to ultraviolet rays. When it is less than 0.1% by weight, the color of the paint may be changed when exposed to ultraviolet rays. If it exceeds 1% by weight, And it is inefficient.

The mixture may further contain carbon nanotube powder, titanium powder and epoxy resin, wherein the weight ratio of the carbon nanotube powder: titanium powder: epoxy resin is 100: 1 to 5: 1 to 5 : May be from 5 to 50 days.

The carbon nanotube powder serves as a buffering material, thereby preventing breakage or breakage due to impact or the like. When the weight of the mixture is 100, the carbon nanotube powder may be contained at a weight of 1 to 5%. Here, when the content of the carbon nanotube powder is less than 1% by weight, the buffering force is insufficient. When the content of the carbon nanotube powder is more than 5% by weight, the buffering power may adversely affect the durability.

The titanium powder contributes to enhancement of durability, abrasion resistance, heat resistance and corrosion resistance, and may be included in a weight of 1 to 5% when the weight of the mixture is 100. If the content of titanium powder is less than 1%, the durability and abrasion resistance are insufficient. If the content of titanium powder is more than 5%, the titanium powder does not contribute to improvement of coating properties such as viscosity, adhesion and elongation.

The epoxy resin may be contained at a weight of 5 to 50% when the weight of the mixture is 100. If the content of the epoxy resin is less than 5% by weight, it is difficult to obtain the desired adhesiveness. When the content is more than 50% The content is relatively reduced and it is difficult to exhibit desired characteristics properly.

To the above mixture, a mixture of sulfuric acid, which is calcined and calcined with sulfuric acid, and a heat-resistant soil mixed with petite powder and clay, and a tourmaline powder and an epoxy resin may be further mixed. The weight ratio of heat resisting soil: tourmaline powder: epoxy resin may be 100: 1 ~ 5: 1 ~ 5: 1 ~ 3: 5 ~ 50.

Sancheong soil powder is obtained by sintering sansung ash produced in Gyeongsang province Sancheong area at 1,200 ~ 1,260 ℃ and then pulverized by a crusher. It is able to function as a refractory material by heat resistance, has excellent abrasion resistance and durability, And so on. The sulfuric acid tofu powder may be contained at a weight of 1 to 5% by weight of the mixture, and if the content is less than 1% by weight, it is difficult to obtain desired strength, nonflammability and abrasion resistance, It does not contribute to improvement of the paint properties such as viscosity, adhesion and elongation.

The heat-resistant soil has heat resistance. For example, petrolite powder and clay are mixed at a weight ratio of 1: 1 to 10, and the weight of the mixture is 1 to 5% by weight. If the content of the heat-resistant soil is less than 1% by weight, it does not have the desired heat resistance, and if it exceeds 5% by weight, it does not contribute to improvement of the paint properties such as viscosity, adhesion and elongation.

The tourmaline powder provides a purifying function by anion generation and far-infrared ray emission, and can be contained at 1 to 3% by weight when the weight of the mixture is 100. If the content of the tourmaline powder is less than 1% by weight, the function such as desired anion generation can not be properly performed. If the content of the tourmaline powder is more than 3% by weight, it can not contribute to improvement of the coating properties such as viscosity, adhesion and elongation.

The epoxy resin may be contained at a weight of 5 to 50 when the weight of the mixture is 100. If the content is less than 5% by weight, it is difficult to obtain the desired adhesiveness. When the content is more than 50% by weight, It is difficult to exhibit the desired characteristics.

Example 1 to Example 3

The compositions for Examples 1 to 3 of the eco-friendly coating compositions for enhancing the durability of concrete structures and steel structures according to the present invention were prepared to have the contents shown in Table 1 below. In Example 2, carbon nanotube powder, titanium powder and epoxy resin (primary addition) were added in an amount corresponding to 100% by weight based on 100% by weight of the mixture according to Example 1, (Second addition) of the carbon nanotube powder, the titanium powder, the epoxy resin (primary addition), the sulfuric acid earth plastic powder, the heat resistant soil, the tourmaline powder and the epoxy resin %.

Composition Example 1 Practical Example 2 Practical Example 3 mixture Ceramic powder 9 wt% 12 wt% 15 wt% Epoxy resin 55 wt% 51 wt% 45 wt% Urethane resin 14 wt% 20 wt% 25 wt% Flame retardant ABS resin 8 wt% 7 wt% 6 wt% Sodium oxide 0.6 wt% 1 wt% 1 wt% Silicon dioxide 5 wt% 3 wt% 3 wt% Dimethylpolysiloxane 0.2 wt% 0.5 wt% 1 wt% Calcium carbonate 8 wt% 5 wt% 3 wt% Aluminum hydroxide 0.2 wt% 0.5 wt% 1 wt% Sum 100 wt% 100 wt% 100 wt% Carbon nanotube powder 0 5 wt% 1 wt% Titanium powder 0 5 wt% 1 wt% Epoxy resin (primary addition) 0 50 wt% 5 wt% Sancheong soil-burning powder 0 0 5 wt% Heat-resistant soil 0 0 5 wt% Tourmaline powder 0 0 3 wt% Epoxy resin (secondary addition) 0 0 50 wt%

Comparative Example 1 and Comparative Example 2

Comparative Example 1 means 100% by weight of epoxy, and Comparative Example 2 means no treatment so as not to apply the paint.

Experimental Example 1 (Anti-salt performance test)

In order to test the resistance to chlorine ion penetration, five specimens cut into a thickness of 5 cm were prepared, and the first specimen was provided with the environmentally friendly coating composition according to Example 1 and the second specimen 2, and the environmentally friendly coating composition according to Example 3 was applied to the third test piece. The paint according to Comparative Example 1 was applied to the fourth test piece, and the paint was not applied to the fifth test piece.

The amount of the passing charges obtained by integrating the current measured every 30 minutes under the condition that a diffusion cell was constituted by the first through fifth test pieces and a DC power source of 60 V was energized for 6 hours was obtained as shown in Table 2 below .

division Amount of passing charge (Coulomb) The first test piece (coating paint of Example 1) - The second test piece (coating paint of Example 2) - The third test piece (coating paint of Example 3) - Fourth test piece (coating of comparative example 1) 500 Fifth test piece (non-treated according to Comparative Example 2) 3,600

As shown in Table 2, in the first to third test pieces coated with the coating compositions according to the eco-friendly coating compositions for improving the durability of the concrete structure and the steel structure according to the present invention, And the coatings of the concrete structure and the steel structure coated with the environmentally friendly coating composition for enhancing the durability of the concrete structure and the steel structure according to the present invention have the chlorine ion penetration resistance of Comparative Examples 1 and 2 of the fourth and fifth test pieces Can be confirmed.

Experimental Example 2 (crack Responsiveness exam)

For the crack responsiveness test, eight test pieces were prepared as shown in Table 3 below.

division How to make 6th test piece The coating composition according to Example 1 was uniformly applied on one surface of a 28 day old mortar so that there was no bubble, and then cured for 7 days. Seventh Test Specimen The coating composition according to Example 1 was uniformly applied on one side of the steel specimen so that there was no bubble, and then cured for 7 days. Test No. 8 The coating composition according to Example 2 was uniformly applied on one side of a 28-day-old mortar so that there was no bubble, and then cured for 7 days. Ninth test piece The coating composition according to Example 2 was uniformly applied on one surface of the steel specimen so as to have no bubbles and then cured for 7 days. Tenth test piece The coating composition according to Example 3 was uniformly applied on one surface of a 28 day old mortar so that there was no bubble, and then cured for 7 days. Eleventh test piece The coating composition according to Example 3 was uniformly applied on one side of the steel specimen so that there was no bubble, and then cured for 7 days. 12th test piece The coating composition according to Comparative Example 1 was uniformly applied on one side of a 28-day-old mortar so that there was no bubble, and then cured for 7 days. 13th test piece The coating composition according to Comparative Example 1 was uniformly applied on one side of the steel specimen so as to have no bubbles and then cured for 7 days.

The thus prepared six to thirteenth test pieces were stored at a temperature of -20 ± 2 ° C. and at a temperature of 20 ± 2 ° C. for 1 hour or more and were tested for the fatigue resistance test in the discontinuity portion of the construction coating material, But. The depth of the groove was divided into two by 4 mm, and then each specimen was stretched at a rate of 5 mm / min using a tensile tester. After that, Table 4 shows the results.

division Whether cracks have occurred 6th test piece clear Seventh Test Specimen clear Test No. 8 clear Ninth test piece clear Tenth test piece clear Eleventh test piece clear 12th test piece Cracking 13th test piece Cracking

As shown in Table 4, it was confirmed that the test pieces (the sixth to eleventh test pieces) coated with the eco-friendly coating composition according to the present invention did not crack or fracture regardless of the mortar or iron.

Experimental Example 3 (Evaluation of flexural / flexural strength)

In order to test the bending resistance of the eco-friendly coating composition according to the present invention, each of the steel specimens was coated with an environmentally friendly coating composition according to Examples 1 to 3, After bending the above steel specimen at 120 ° on a Φ10 mm round bar, the flexural / flexural strength test was carried out according to the KSM5000 test method.

As a result of the test, it was confirmed that the coating film formed by the environmentally friendly coating composition according to the present invention showed no abnormality and had sufficient bending resistance and bending strength despite the extreme conditions as described above.

Experimental Example 4 (Chemical resistance test)

Coatings were formed on steel specimens using the environmentally friendly coating compositions according to Examples 1 to 3, and these steel specimens were immersed in the chemicals shown in Table 5 below for 168 hours each, and their surfaces were visually observed .

Test Items Test result mountain 25% hydrochloric acid 168 hours clear 30% sulfuric acid 168 hours clear Alkaline 25% ammonia water 168 hours clear 30% caustic soda 168 hours clear salts Saturated sodium chloride solution 168 hours clear Saturated solution of calcium chloride 168 hours clear Petroleum Industrial No.2 gasoline 168 hours clear

As shown in Table 5, even though the samples coated with the environmentally friendly coating composition according to the present invention were exposed to all chemicals such as acid, alkali, salt, and petroleum for a certain period of time (168 hours) It was confirmed that surface change and color change did not occur. If a product having a weak chemical resistance is used, environmental pollution due to the paint will occur when the paint melts or the surface is peeled off. The eco-friendly paint composition according to the present invention is environmentally friendly because of its excellent chemical resistance .

FIG. 1 is a flowchart illustrating a coating method using an environmentally friendly coating composition for improving the durability of a concrete structure and a steel structure according to an embodiment of the present invention. FIG. 2 is a view showing a concrete structure and a steel structure according to an embodiment of the present invention And is a coating structure formed by a coating method using an environmentally friendly coating composition for improving durability.

1 and 2, a coating method using an environmentally friendly coating composition for enhancing the durability of a concrete structure and a steel structure according to an embodiment of the present invention is characterized in that the surface of a concrete structure or a steel structure (S11, S12). This is a step S11 of removing the rust and the like generated on the surface 1 of the concrete structure or the steel structure by sanding and spraying the high pressure water on the surface 1 of the concrete structure or steel structure after the sanding Step S12 may be included.

When the removal of the contaminants on the surface 1 of the structure is completed (S11 and S12), the primer is applied to the surface 1 of the structure having been subjected to removal of the contaminants to form the application layer 11 of the primer (S13). The primer may be, for example, a zinc-based primer, an anti-corrosive coating, and may serve as a primer with an adhesive component.

When the application of the primer is completed (S13), the environmentally friendly coating composition according to the present invention is applied onto the primer coating layer 11 (S14). At this time, the eco-friendly coating composition according to the present invention can be used as a middle or top coat, whereby the eco-friendly coating composition according to the present invention can form the intermediate layer 12 or the top coat layer 13. The eco-friendly coating composition according to the present invention has been described in detail in the eco-friendly coating composition for enhancing the durability of the concrete structure and the steel structure according to the present invention, and a description thereof will be omitted.

When the intermediate layer 12 is formed by applying the environmentally friendly coating composition according to the present invention, the upper layer 13 may be formed later with the same composition, or the upper layer 13 may be formed using a different top coat, . When the top coat layer 13 is formed by applying the environmentally friendly coating composition according to the present invention, the intermediate layer 12 may be formed in advance with the same composition before the top coat layer 13 is formed, or a separate intermediate coat, which is a different composition, So that the intermediate layer 12 can be formed in advance.

According to the eco-friendly coating composition for enhancing the durability of the concrete structure and the steel structure according to the present invention and the coating application method using the eco-friendly coating composition, it is possible to improve the corrosion resistance, It is possible to obtain excellent chemical resistance and further to provide excellent impact resistance and abrasion resistance, thereby suppressing the occurrence of deterioration and contributing to enhancement of the durability of the structure.

Although the present invention has been described with reference to the accompanying drawings, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

11: Application layer of primer
12: Middle Floor
13: Top layer

Claims

In a coating composition of a concrete structure and a steel structure,
A ceramic powder, an epoxy resin, a urethane resin, a flame-retardant ABS resin, sodium oxide, silicon dioxide, dimethylpolysiloxane, calcium carbonate and aluminum hydroxide,
The mixture may contain,
Wherein the ceramic powder has a particle size of 0.1 to 100 탆 and comprises 5 to 15 wt% of the ceramic powder, 40 to 55 wt% of the epoxy resin, 7 to 25 wt% of the urethane resin, 5 to 8 wt% A mixture of 0.5 to 1 wt% of sodium oxide, 1.5 to 5 wt% of silicon dioxide, 0.1 to 1 wt% of dimethylpolysiloxane, 3 to 8 wt% of calcium carbonate and 0.1 to 1 wt% of aluminum hydroxide,
Wherein the weight ratio of the carbon nanotube powder to the titanium powder to the epoxy resin is 100: 1 to 5: 1 to 5: 5 to 50, and the carbon nanotube powder, , Concrete structures and steel structures.

delete

The method according to claim 1,
The mixture was further mixed with a mixture of a sulfuric acid soil-decomposable powder obtained by calcining and spraying a sulfuric acid soil, a heat-resisting soil mixed with petite powder and clay, a tourmaline powder and an epoxy resin, and the mixture was mixed with sulfuric acid soil- Wherein the weight ratio of the epoxy resin is 100: 1 to 5: 1 to 5: 1 to 3: 5 to 50. The eco-friendly coating composition for enhancing the durability of concrete structures and steel structures.

In a method for coating concrete structures and steel structures,
Performing a removal of contaminants on the surface of the concrete structure or the steel structure;
Applying a primer to the surface after removal of the contaminant; And
Applying the environmentally friendly coating composition according to claim 1 or 4 onto a coating layer of the primer;
Wherein the coating composition is applied to the surface of the concrete structure and the steel structure to improve the durability of the concrete structure and the steel structure.