KR101955675B1 - High speed drying polyurea paint composition having excellent watertightness, corrosion resistance and construction method using thereof - Google Patents

Abstract

The present invention relates to a fast curing type polyurea paint composition improved in watertightness and corrosion resistance, and a method of construction using the same. More specifically, disclosed are a fast curing type polyurea paint composition improved in watertightness and corrosion resistance, and a method of construction using the same. To this end, the fast curing type polyurea paint composition comprises: a resin mixture composed of 25 to 35 wt% of a polyamine mixture, 20 to 30 wt% of epoxy adduct amine polyol, 15 to 20 wt% of a crosslinking agent, 15 to 20 wt% of a nano-corrosion resistant filler, 5 to 10 wt% of a metallic ceramic pigment, and 2-8 wt% of an additive; and a curing agent obtained by mixing 70 to 130 parts by weight of a mixture of at least one selected from the group consisting of polyol, polytetramethylene glycol and polyamine, based on 100 parts by weight of an isocyanate mixture. The polyamine mixture is prepared by reacting a polyfunctional epoxy resin with polyfunctional amine polyol. The metallic ceramic pigment is any one selected from the group consisting of cobalt, zinc, nickel, titanium, aluminum, lithium and a mixture thereof, and the volume ratio of the resin mixture and the curing agent is 1: 1.

Description

TECHNICAL FIELD [0001] The present invention relates to a rapid curing type polyurea coating composition having improved watertightness and corrosion resistance, and a coating method using the same. BACKGROUND ART < RTI ID = 0.0 >

The present invention relates to a polyurea coating composition and a method of applying the same, and more particularly, to a polyurea coating composition and a coating method using the polyurea coating composition. Curing type polyurea paint composition having improved corrosion resistance and a method of using the same.

Generally, concrete, steel structures such as waterworks, sewage treatment facilities, paper mills, chemical plants, and food factories are subject to chemical corrosion by water, salt water, carbonic acid, chemical agents, etc. or by high water pressure, It is exposed to an environment where physical abrasion can easily occur. Accordingly, the structures suffer from problems such as leakage of water due to corrosion or erosion, maintenance costs, and deterioration of durability due to cracks or cracks in the structure, thereby reducing the life of the structure itself.

In order to prevent the above-mentioned phenomenon, water-soluble or solvent-free epoxy paints, ceramic paints, polyurethane paints and the like are used, but the corrosion resistance and durability are somewhat deteriorated.

Specifically, when an epoxy-based paint or a ceramic-based paint is used as a waterproof coating agent, cracks are easily generated in the coating due to external impact due to low elongation, and the workability is poor due to a slow curing speed during winter work.

In the case of polyurethane paints, self-leveling type products are disadvantageous in that they are poor in workability for use in walls and ceilings.

In addition, the epoxy, urethane, and ceramic coatings are two-pack products, which may deviate from the proper blend ratio of the base and curing agent, or may not be sufficiently mixed with the base and curing agent, resulting in poor physical properties due to uncured coating.

On the other hand, polyurea is a polymer compound having a urea bond in a molecular structure, and is synthesized with a chain extension and a diamine having a low molecular weight to form a urea unit. Therefore, polyurea varies widely depending on various factors such as the selected material, the molecular weight, and the reacted ratio. Particularly, in the case of polyurea, since the amide ester bond of fatty acid has a mixed bond, the property at high temperature has an intermediate property between these polyester and polyamide.

However, polyurea generally has good properties such as flexibility and elongation due to its elastomeric properties such as synthetic rubber. However, due to the repeating structure of the oxyethylene ether in the molecule and the limitation of the basic raw materials currently in common use, There is a limit to giving characteristics to

KR 10-2008-0018941 A KR 10-1451974 B1

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to provide a fast curing type polyurea coating composition which improves watertightness and corrosion resistance by improving physical properties of polyurea, And a method of using the same.

It is also an object of the present invention to provide a fast curing type polyurea coating composition with improved watertightness and corrosion resistance by which curing time can be shortened and work efficiency can be improved, and a method of using the same.

In order to attain the above object, the present invention provides a fast-curing polyurea coating composition with improved watertightness and corrosion resistance, comprising 25 to 35% by weight of a polyamine mixture, 20 to 30% by weight of an adduct amine polyol, 15 to 20% 15 to 20% by weight of a nano-corrosion-resistant filler, 5 to 10% by weight of a metal-based ceramic pigment and 2 to 8% by weight of an additive; And 70 to 130 parts by weight of a mixture of at least one selected from polyol, polytetramethylene glycol and polyamine with respect to 100 parts by weight of an isocyanate mixture, wherein the polyamine mixture comprises 20 to 30% by weight of polyoxypropylene diamine, A polyfunctional amine polyol having a weight average molecular weight of 200 to 5000 and an epoxy equivalent weight of 100 to 800 g / eq and an epoxy equivalent weight of 100 to 800 g / eq are mixed with 5 to 15 wt% of polyoxypropylenetriamine, Wherein the metal-based ceramic pigment is one selected from the group consisting of cobalt, zinc, nickel, titanium, aluminum, lithium and mixtures thereof, and the resin mixture and the curing agent Is 1: 1.

In addition, the method of the present invention using a fast-curing type polyurea coating composition with improved watertightness and corrosion resistance includes a pretreatment step of removing foreign matters on the surface of a concrete or steel surface; Applying a primer to the pretreated surface; And spraying the mixture of a resin mixture and a curing agent in a fast curing type polyurea coating composition having improved watertightness and corrosion resistance, wherein the temperature of the mixture is 50 to 80 ° C and the spray jet pressure is 1500 to 2500 psi .

The fast curing type polyurea coating composition of the present invention having improved watertightness and corrosion resistance of the present invention comprises a polyamine mixture and an epoxy adduct amine polyol having a high degree of crosslinking to form a dense structure to provide a physical structure such as tensile strength and abrasion resistance, The characteristics, as well as the elongation, water tightness and corrosion resistance are improved.

Further, since the polyurea coating composition according to the present invention is of a fast curing type, the curing time can be shortened and the working efficiency can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various different forms, and these embodiments are not intended to be exhaustive or to limit the scope of the present invention to the precise form disclosed, It is provided to inform the person completely of the scope of the invention. And the terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. The singular forms herein include plural forms unless the context clearly dictates otherwise.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Brief Description of Drawings FIG. 1 is a block diagram of a computer system according to an embodiment of the present invention; FIG. 2 is a block diagram of a computer system according to an embodiment of the present invention; FIG.

The rapid curing type polyurea coating composition according to the present invention having improved watertightness and corrosion resistance is a two-component polyurea coating composition comprising a resin mixture and a curing agent. The volume ratio of the resin mixture and the curing agent is 1: 1.

Wherein the resin mixture comprises 25 to 35 wt% of a polyamine mixture, 20 to 30 wt% of an epoxy adduct amine polyol, 15 to 20 wt% of a crosslinking agent, 15 to 20 wt% of a nano-corrosion resistant filler, 5 to 10 wt% 8% by weight.

The curing agent is obtained by mixing 70 to 130 parts by weight of a mixture of at least one selected from the group consisting of polyol, polytetramethylene glycol, and polyamine, based on 100 parts by weight of the isocyanate mixture.

The resin mixture and the curing agent according to the present invention will be specifically described.

First, the polyamine mixture of the resin mixture gives excellent mechanical properties such as elongation for forming a flexible film, impact resistance, crack resistance, abrasion resistance, etc. The polyamine mixture of the present invention contains 20 to 30% by weight of polyoxypropylene diamine, And 5 to 15% by weight of polyoxypropylene triamine. For example, in the present invention, the polyamine mixture may be a Jeffamine series (Jeffamine T-5000, Jeffamine D-2000, Jeffamine D-230, Jeffamine D-400 or Jeffamine T-403) manufactured by Huntsman.

The content of the polyamine mixture is preferably 25 to 35% by weight. When the content is less than 25% by weight, the effect on physical properties such as flexibility and impact resistance of the coating film is insignificant. When the content exceeds 35% by weight, The content of the other composition is decreased and it is difficult to make a polyurea coating composition having desired physical properties. The weight average molecular weight of the polyamine mixture is preferably 200 to 5000.

Epoxy Adduct Amine Polyol is a material prepared by reacting an amine polyol with an epoxy compound through an adduct, and has a highly crosslinked network structure. Thus, it is possible to produce a coating composition having a dense structure. Therefore, , And a main function such as an anti-corrosiveness.

In the present invention, the epoxy adduct amine polyol is obtained by reacting the polyfunctional epoxy resin having an epoxy equivalent of 100 to 800 g / eq with the polyfunctional amine polyol at 80 to 100 ° C for 2 to 3 hours.

According to a preferred embodiment of the present invention, the polyfunctional amine polyol is an addition reaction product of an alkylene amine having two or more amine groups with an epoxide compound, and has an amine value of 300 to 500 mgKOH / g, an alkylene amine-based polyether polyol having a hydroxyl value of 600 to 800 mgKOH / g and having 4 or more functional groups.

In addition, the alkylene amine having two or more amine groups may be represented by the following Formula 1, and the epoxide compound may be any one selected from the group consisting of ethylene oxide, propylene oxide, isobutylene oxide, and styrene oxide have.

[Chemical Formula 1]

(Wherein X is a hydrogen or an amine group, and R is an alkyl group having ₁ to ₆ carbon atoms.)

For example, the amine polyol of the present invention is preferably an ethylenediamine-based polyether polyol produced by reacting ethylene diamine as an alkylene amine and ethylene oxide or propylene oxide as an epoxide compound.

In the addition reaction of the alkylene amine and the epoxide compound, a crosslinking agent may be further added. For example, the crosslinking agent may be a urethane-based crosslinking agent. Examples of the crosslinking agent include NEWPOL NP-300, NEWPOL NP-400 and KONIX KR- 6350 may be used alone or in combination.

The content of the epoxy adduct amine polyol is preferably 20 to 30% by weight. If the content is less than 20% by weight, it may be difficult to produce a composition having a dense structure. When the content is more than 30% by weight, The workability may be deteriorated.

The crosslinking agent affects the curing time of the coating and increases the degree of crosslinking to improve the mechanical properties including durability. In the present invention, an aromatic or alicyclic amine compound used as a chain extender may be used as the cross-linking agent, and any one selected from the group consisting of diethyltoluenediamine, 4,4-methylenebis aniline, .

When the content is less than 15% by weight, the effect of the chain extender is insignificant and it is difficult to expect improvement in mechanical properties. When the content is more than 20% by weight, excessive hardness and elongation Which is undesirable.

The nano-corrosion-resistant filler is a nano-sized layered or plate-like filler, which is irregularly arranged in the composition to protect the surface from external substances such as corrosion-inducing substances, thereby improving the corrosion resistance, chemical resistance and chemical resistance. it is preferably one selected from the group consisting of barite, silica, diatomaceous earth, mica, talc, zeolite, and mixtures thereof.

The content of the nano-corrosion-resistant filler is preferably 15 to 20% by weight. If the content is less than 15% by weight, the desired corrosion resistance, chemical resistance and chemical resistance are lowered. If the content is more than 20% by weight, Can be lowered.

The metal-based ceramic pigment is a pigment prepared by bonding a metal compound at a high temperature in order to impart the color of a polyurea paint, and is capable of forming a chemically stable coating film by improving heat resistance, chemical resistance, chemical resistance and solvent resistance. , Zinc, nickel, titanium, aluminum, lithium, and mixtures thereof. For example, P120 (Co-Al-Li pigment), P521 (Co-Al pigment), P600 (Co-Ni-Zn-Ti pigment) and the like of Hanil can be used.

The content of the metal-based ceramic pigment is preferably 5 to 10% by weight, and can be suitably adjusted within the above-mentioned range to form a chemically stable coating film and to express a desired concentration of hue.

The additives may be mixed or used alone in an amount of 2 to 8% by weight, typically an adhesion promoter, antifoaming agent, UV stabilizer, etc., used in the composition of the paint.

The adhesion promoter serves to reinforce the adhesion to the substrate and the strength of the coating composition. For example, aminosilane from Shin-Etsu can be used.

The antifoaming agent is added in order to prevent the occurrence of bubbles. One or more antifoaming agents selected from a mineral oil type antifoaming agent, a silicone type antifoaming agent and a non-silicone type antifoaming agent can be selected. For example, BYK-054 manufactured by BYK, Can be used.

The UV stabilizer prevents premature deterioration by ultraviolet rays. For example, Tinuvin 328 manufactured by Ciba may be used.

The additive is added in consideration of the physical properties of the coating composition in consideration of reinforcement of adhesive strength to the surface, strength reinforcement of the composition, prevention of bubbles and prevention of premature deterioration. When the amount is less than 2% by weight, the effect is insignificant, The effect is not remarkably improved any more and the other properties of the composition may be lowered, which is not preferable.

Meanwhile, the curing agent of the present invention is obtained by mixing 70 to 130 parts by weight of a mixture of at least one selected from a polyol having a hydroxyl group, polytetramethylene glycol and an amine group, based on 100 parts by weight of the isocyanate mixture, To 5 hours, the NCO content is preferably 10 to 20% by weight, and the viscosity is preferably 500 to 2500 cps / 25 ° C.

The isocyanate mixture may be selected from the group consisting of methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HDI), hexamethylene diisocyanate trimer (HDT), iso And one or more selected from the group consisting of isophorone diisocyanate (IPDI) and cyclohexylmethane diisocyanate (H ₁₂ MDI).

The polyol may be at least one selected from the group consisting of polyethylene glycol, polypropylene glycol, polybutylene glycol and polyisoprene glycol, and the polyamines may be polyoxypropylene diamine and polyoxypropylene triamine And mixtures thereof.

The polyurea coating composition of the present invention is completed by mixing the resin mixture and the curing agent, and the gelation time varies depending on the kind of the polymer, the type of the crosslinking agent, the kind and the component of the curing agent in the resin mixture, Loses.

At this time, the polyurea is a polymer material having an elastomeric property and because of the rapid reactivity of amine and isocyanate, it can not be mixed at room temperature generally, and coating work is carried out by using special spray equipment. In other words, it is characterized in that a two-component high-temperature and high-pressure spraying device is used to pass a mixed impingement type device without a mixing process and cured within a few seconds or several minutes after the two solutions are combined and sprayed to form a firm and thick film.

According to a preferred embodiment of the present invention, a method of applying a fast curing type polyurea coating composition having improved watertightness and corrosion resistance includes a pretreatment step of removing foreign matters on the surface of a concrete or steel surface; Applying a primer to the pretreated surface; And spraying the mixture of a resin mixture and a curing agent in a fast curing type polyurea coating composition having improved watertightness and corrosion resistance, wherein the temperature of the mixture is 50 to 80 ° C and the spray jet pressure is 1500 to 2500 psi .

The concrete method of the present invention will be described in detail. The concrete floor has a laitance layer and other contaminants on the concrete surface. Next, the portion having the pore portion is filled with a sealing agent and applied with a primer, followed by spraying the polyurea paint. In the case of steel surfaces, the steel surface is blasted to remove rust and foreign matter, and rust-preventive primer is applied. Next, the polyurea paint is completed by spraying.

In the construction according to the present invention, the conditions of the two-pack type high temperature and high pressure spray apparatus are as follows. It is desirable to maintain the pressure of the spray injector at 1500 to 2500 psi when the resin mixture is mixed with the curing agent. When the pressure is lower than 1500 psi, there is a problem of poor physical properties due to unfavorable mixing due to poor mixing. If the pressure is higher than 2,500 psi, a smooth coated surface can not be obtained.

On the other hand, the temperature of the resin mixture and the curing agent at the time of the mixing collision is preferably maintained at 50 to 80 캜. If the temperature is lower than 50 캜, a problem of mixing failure occurs. If the temperature is higher than 80 캜, the reaction rate of the resin mixture and the curing agent becomes faster and a smooth coated surface can not be obtained.

Conventional urethane and epoxy coatings are two-pack products. The resin mixture and the curing agent must be blended and mixed thoroughly. However, it may be incompatible with the resin mixture or the physical properties may be deteriorated due to un- Which takes more than 24 hours. On the other hand, when the polyurea coating composition of the present invention is used, the curing time is shortened to a few minutes, which shortens the working time and reduces the labor cost. In addition, it improves the efficiency of the construction and also has better mechanical properties and abrasion resistance than existing paints .

Hereinafter, the present invention will be described in more detail by way of examples, but the scope of the present invention is not limited by the examples.

< Example >

Example  One

First, 52.5% by weight of methylene diphenyl diisocyanate (MDI) and 47.5% by weight of polypropylene glycol PP-2000 were mixed and maintained at 80 to 90 ° C for 3 hours to prepare a curing agent having an NCO content of 15.6%.

Next, a resin mixture is prepared. 27% by weight of a polyamine mixture containing 20% by weight of polyoxypropylene diamine and 7% by weight of polyoxypropylene triamine was obtained, and 25% by weight of an epoxy adduct amine polyol was used. 20% by weight of a crosslinking agent containing 12% by weight of diethyltoluene diamine and 8% by weight of 4,4-methylenebisaniline was prepared. 15% by weight of a nano-corrosion resistant filler and 7% by weight of a metallic ceramic pigment were prepared. Further, 2% by weight of an adhesion promoter, 2% by weight of a defoamer and 2% by weight of a UV stabilizer were mixed as an additive.

Example  2

First, 50.5% by weight of methylene diphenyl diisocyanate (MDI) and 49.5% by weight of polypropylene glycol PP-3000 were mixed and maintained at 80 to 90 ° C for 3 hours to prepare a curing agent having an NCO content of 15.6%.

Next, a resin mixture is prepared. 30% by weight of a polyamine mixture containing 22% by weight of polyoxypropylene diamine and 8% by weight of polyoxypropylene triamine was obtained, and 20% by weight of an epoxy adduct amine polyol was used. 19% by weight of a crosslinking agent containing 10% by weight of diethyltoluene diamine and 9% by weight of 4,4-methylenebisaniline was prepared. 18% by weight of a nano-corrosion resistant filler and 7% by weight of a metallic ceramic pigment were prepared. Further, 2% by weight of an adhesion promoter, 2% by weight of a defoamer and 2% by weight of a UV stabilizer were mixed as an additive.

Example  3

First, 49% by weight of methylene diphenyl diisocyanate (MDI) and 51% by weight of polypropylene glycol PP-4000 were mixed and maintained at 80 to 90 ° C for 3 hours to prepare a curing agent having an NCO content of 15.4%.

Next, a resin mixture is prepared. 30% by weight of a polyamine mixture containing 21% by weight of polyoxypropylene diamine and 9% by weight of polyoxypropylene triamine was obtained, and 21% by weight of an epoxy adduct amine polyol was used. 19% by weight of a crosslinking agent containing 9% by weight of diethyltoluene diamine and 10% by weight of 4,4-methylenebisaniline was prepared. 17% by weight of a nano-corrosion resistant filler and 7% by weight of a metallic ceramic pigment were prepared. Further, 2% by weight of an adhesion promoter, 2% by weight of a defoamer and 2% by weight of a UV stabilizer were mixed as an additive.

Comparative Example  One

First, 52.5% by weight of methylene diphenyl diisocyanate (MDI) and 47.5% by weight of polypropylene glycol PP-2000 were mixed and maintained at 80 to 90 ° C for 3 hours to prepare a curing agent having an NCO content of 15.6%.

Next, a resin mixture is prepared. 35% by weight of a polyamine mixture containing 28% by weight of polyoxypropylene diamine and 7% by weight of polyoxypropylene triamine was obtained, and 15% by weight of an epoxy adduct amine polyol was used. 20% by weight of a crosslinking agent containing 14% by weight of diethyltoluene diamine and 6% by weight of 4,4-methylenebis aniline was prepared, and 16% by weight of a nano-corrosion resistant filler and 8% by weight of a metallic ceramic pigment were prepared. Further, 2% by weight of an adhesion promoter, 2% by weight of a defoamer and 2% by weight of a UV stabilizer were mixed as an additive.

Comparative Example  2

First, 50.5% by weight of methylene diphenyl diisocyanate (MDI) and 49.5% by weight of polypropylene glycol PP-3000 were mixed and maintained at 80 to 90 ° C for 3 hours to prepare a curing agent having an NCO content of 15.6%.

Next, a resin mixture is prepared. 35% by weight of a polyamine mixture containing 25% by weight of polyoxypropylene diamine and 10% by weight of polyoxypropylene triamine was obtained, and 25% by weight of an epoxy adduct amine polyol was used. 19% by weight of a crosslinking agent containing 11% by weight of diethyltoluene diamine and 8% by weight of 4,4-methylenebisaniline was prepared. 11% by weight of a nano-corrosion resistant filler and 4% by weight of a metallic ceramic pigment were prepared. Further, 2% by weight of an adhesion promoter, 2% by weight of a defoamer and 2% by weight of a UV stabilizer were mixed as an additive.

Comparative Example  3

It is a solvent-free epoxy-based paint sold on the market.

Comparative Example  4

It is a ceramic metal type paint sold on the market.

The detailed contents of Examples 1 to 3 and Comparative Examples 1 to 4 are shown in Table 1 below.

Physical Properties Test of Coating Composition

The physical properties of the coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were measured by the following test methods.

At this time, spray coating was performed under the following conditions.

- Painting machine: Used by Gusmer's polyurea paint machine

- Temperature of spray liquid: 65 ℃

- Pressure at spraying: 2000 psi

1. Tensile strength and elongation

Each of the coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 was applied to prepare a dumbbell specimen having a width of 5 mm and then an external force was applied to the specimen using a tensile tester. The tensile strength and elongation at the time of the test were evaluated.

2. Abrasion resistance

Each of the specimens coated with the respective coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 was prepared, and the specimen was fixed on a rotating disk. Thereafter, the specimen was subjected to a constant load To examine whether or not there is a wear phenomenon.

(Type of abrasive wheel: CS-17 / H-18, Weight of abrasive wheel: 1Kg, Number of revolutions: 1000 times)

3. Permeability

After the specimens were coated with the respective coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4, the presence or absence of water was examined (KS F 4921).

4. Crack Resistance

The specimens coated with the respective coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were prepared and then examined for residual scratches and fractures at -20 ° C and 20 ° C (KS F 4936).

5. Impact test

Specimens coated with the respective coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were prepared and 300 g of a weight was dropped on a specimen at a height of 500 mm and examined for peeling or cracking in the coating film .

6. Adhesion strength

After coating each of the coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 on the pretreated concrete and steel specimens, it was examined whether there was peeling of the coating due to adhesion failure (KS F 4936) .

7. Salt spray test

A specimen coated with each of the coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 was placed in a chamber having a temperature of 35 ° C and a 5% aqueous solution of sodium chloride (pH 6.5 to 7.2) was dispensed for 500 hours, Swelling, cracking, peeling, peeling, and rust formation were evaluated (KS D 9502).

8. Acid resistance test

Specimens coated with the respective coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were prepared and the specimens were immersed in a 5% sulfuric acid aqueous solution for 168 hours, and then the state changes such as cracking and swelling of the coating film were observed Respectively.

9. Alkali resistance test

Specimens coated with the respective coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were prepared and the specimens were immersed in a 5% sodium hydroxide aqueous solution for 168 hours, and then the state changes such as cracking and swelling of the coating film Respectively.

10. Touch-dry time

The specimens coated with the respective coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were prepared and the time when the specimen was not lightly applied to the fingers was measured.

The results of physical properties of the coating compositions prepared in Examples 1 to 3 and Comparative Examples 1 to 4 are shown in Table 2 below.

(?: Good,?: Fair, X: bad)

Referring to Table 2, Examples 1 to 3 show excellent results in all of the test items, while Comparative Example 1 shows that the content of the epoxy adduct amine polyol is low as compared with the above Examples, Strength and salt spray test showed a somewhat lowered average.

In Comparative Example 2, the water permeability and the adhesive strength were satisfactory as a result of containing an appropriate amount of the epoxy adduct amine polyol. However, as the content of the nano-corrosion-resistant filler and the metal-based ceramic pigment was low, And was poor in the salt spray test.

Compared with the polyurea coating compositions prepared in Examples 1 to 3, Comparative Example 3 and Comparative Example 4 showed slightly lower abrasion resistance, impact test and adhesive strength, and had poor elongation and poor crack response at -20 ° C Respectively.

Thus, from the results of the above-mentioned Examples, the polyurea coating composition of the present invention is excellent in elongation, tensile strength and abrasion resistance by forming a dense structure including a polyamine mixture and an epoxy adduct amine polyol having high degree of crosslinking, , Water permeability, impact resistance, adhesive strength, chemical resistance, and chemical resistance, and it is considered that the drying time is shortened and the workability can be improved as compared with a conventional coating composition.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the claims of the invention to be described below may be better understood. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing detailed description, and all changes or modifications derived from the appended claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (5)

20 to 30 wt% of an epoxy adduct amine polyol, 15 to 20 wt% of a crosslinking agent, 15 to 20 wt% of a nano-corrosion resistant filler, 5 to 10 wt% of a metal-based ceramic pigment and 2 to 8 wt% of an additive, ; And
A curing agent obtained by mixing 70 to 130 parts by weight of a mixture of at least one selected from polyol, polytetramethylene glycol and polyamine with 100 parts by weight of an isocyanate mixture,
The polyamine mixture is prepared by mixing 20 to 30% by weight of polyoxypropylene diamine and 5 to 15% by weight of polyoxypropylene triamine, and has a weight average molecular weight of 200 to 5000,
The epoxy adduct amine polyol is obtained by reacting a polyfunctional epoxy resin having an epoxy equivalent of 100 to 800 g / eq and a polyfunctional amine polyol having 4 or more functional groups at 80 to 100 ° C for 2 to 3 hours,
Wherein the metal-based ceramic pigment is any one selected from the group consisting of cobalt, zinc, nickel, titanium, aluminum, lithium, and mixtures thereof,
Wherein the volume ratio of the resin mixture and the curing agent is 1: 1.
The method according to claim 1,
Wherein the polyfunctional amine polyol is an addition reaction product of an alkylene amine having two or more amine groups and an epoxide compound and has an amine value of 300 to 500 mgKOH / g and a hydroxyl value of 600 to 800 mgKOH / g, and an alkylene amine-based polyether polyol having 4 or more functional groups. The fast-curing polyurea coating composition according to claim 1,
The method according to claim 1,
Wherein the nano-corrosion resistant filler is any one selected from the group consisting of barite, silica, diatomaceous earth, mica, talc, zeolite, and mixtures thereof.
The method according to claim 1,
Wherein the cross-linking agent is any one selected from the group consisting of diethyl toluene diamine, 4,4-methylene bis aniline, and mixtures thereof.
A pretreatment step of removing foreign matters on the surface of the concrete or steel surface;
Applying a primer to the pretreated surface; And
Mixing and spraying the resin mixture and the curing agent in the coating composition according to any one of claims 1 to 4,
Wherein the liquid temperature during the mixing is 50 to 80 ° C and the spraying pressure is 1500 to 2500 psi.