KR101174108B1 - Quick-setting typed polyurea-based composition for coating the surface of structures such as concrete, steel and timber - Google Patents

Abstract

PURPOSE: A quick-curable polyurea-based surface coating composition is provided to have excellent waterproofing performance, while recovering performance of concrete in which water resistance and durability are reduced. CONSTITUTION: A quick-curable polyurea-based surface coating composition comprises a base material and a curing agent with mixing ratio of 7:3(v/v). The base material comprises 55-70 parts by weight of methylene diphenyl diisocyanate, 20-30 parts by weight of polyoxypropylene glycol, and 10-15 parts by weight of propylene carbonate. The curing agent comprises 30-70 parts by weight of polyoxypropylenediamine, 10-20 parts by weight of polyethertriamine, 5-10 parts by weight of diethyltoluenediamine, 8-27 parts by weight of diethyltoluenediamine, 2-5 parts by weight of propylene glycol, 1-2 parts by weight of propyltrimethoxysilane, 2-3 parts by weight of pigment, and 2-3 parts by weight of UV absorbent.

Description

Quick-Setting Typed Polyurea-Based Composition For Coating The Surface Of Structures Such As Concrete, Steel And Timber}

The present invention relates to a composition for coating the surface of a structural material, such as concrete, steel or wood, and a method for coating the surface of the structural material using the same. More specifically, the present invention is a polyurea-based two-component quick-curing surface coating composition, it is a multi-purpose, such as to quickly coat the surface of deteriorated concrete or to coat the surface thereof to prevent degradation of steel or wood Was developed.

The surface coating composition for the polyurea-based structural material of the present invention has a low viscosity to quickly penetrate into the matrix as well as the surface to form a strong resistance, and may be used by mixing with sand, gravel, silica and the like.

In addition, the surface coating composition for polyurea-based structural material of the present invention is excellent in adhesion performance to the surface of concrete, steel or wood, etc., and excellent protection performance of the attached substrate to prevent the concrete, steel or wood from various deterioration conditions It is a surface coating composition for protecting structural materials, such as these.

Typically, reinforced concrete structures use a wide variety of repair methods, depending on the desired performance or type of damage. In particular, the FRP used in the repair reinforcement method is excellent in corrosion resistance, high insulation and fatigue resistance, and excellent in the ductility of the concrete compared to other materials (ACI Committee 440, 2006; ACI Committee 440).

As such, the repair and reinforcement method using FRP has a method of improving strength and rigidity by integrating a reinforcement with a base material by using an adhesive such as epoxy, but the coating process of surface treatment primer and adhesive is complicated, and the drying time This length is poor workability. The adhesive used here creates an unnecessary interface, and problems such as deterioration and dropping out occur over time. Therefore, to solve this problem fundamentally, a groundbreaking material that can remove the interface existing in the structure and the repairing material and induce an integral behavior is required.

 In addition, concrete, steel, wood, etc. are deteriorated rapidly due to various environmental changes in the atmosphere, that is, change in temperature or humidity, etc., which does not maintain the original design durability life. Although paint is used as a coating material to prevent deterioration of the steel material, general paint materials such as paint have a disadvantage in that they cannot maintain their physical properties due to separation or dropping of the coating film under various external environmental conditions.

 Polyurea is a urethane-based high-molecular compound. It is not only capable of controlling various physical properties but also widely used as a binder-type composite material including adhesives and coating agents due to its excellent interfacial adhesion and mechanical properties. It is a material that can be applied to all types of surfaces such as wood, glass, styrofoam, concrete, paper, and textiles.

Recently, due to the flexibility of polyurea, its application field has been expanded to microelectronic materials such as binder materials for flat panel displays. However, in the construction field, polyurea is mostly used as a waterproof coating material for underground concrete structures. In some cases, due to the high ductility and adhesion performance of polyurea, it can effectively resist explosion and impact, minimizing damage to structures and human life, and better than FRP or general paint coating materials by reinforcing concrete structures or coating the surface of steel. Has been reported.

Therefore, the polyurea-based surface coating composition is used as a high toughness high adhesion reinforcing material that can be rapidly installed but does not create a secondary interface, and thus can be effectively used for improving durability of concrete or preventing deterioration such as steel or wood.

Therefore, the present invention has been made to solve the conventional problems, the object of the present invention is to recover the performance of the concrete, the water resistance and durability of the new concrete surface coating composition that can protect the concrete interior and exterior as well as waterproof To provide.

In addition, another object of the present invention is to provide a surface coating composition of steel and wood having a good durability in a fast curing type coating on the surface of steel, wood, and the like even under various deteriorated environmental conditions.

In addition, another object of the present invention is a method for treating a concrete surface using the concrete surface coating composition described above; And it provides a method of surface treatment of steel and wood.

In the study of polyurea having high toughness, ductility and high adhesion, in order to maintain the high strength coating agent while enhancing the adhesion performance, the reaction time is required to allow the polyurea to penetrate and adhere to the micro cracks on the surface of the test specimen. The material was configured to control.

Because polyurea is a thermosetting resin, it can be expected that the reaction time can be controlled by temperature control, but the adhesive strength after curing is hardened because the control of temperature cannot induce hardening at the same time to the minute portion of the surface of the test specimen. Is much lowered.

In general, even though the main agent and the hardener used in the production of polyurea are very diverse, and even if the main agent and the hardener are uniformly mixed, it is very difficult to perform a uniform reaction from the microscopic viewpoint. Therefore, in the present invention, the initial reactivity is somewhat lower than that of the conventional polyurea, but during the polymerization reaction, the synthetic polymerization proceeds at about the same time, so that the microbubbles are formed so as not to form the minute parts.

The surface coating composition for polyurea structural materials of this invention consists largely of a main body and a hardening | curing agent.

The subject of the surface coating composition for polyurea-based structural material of the present invention, based on a total of 100 parts by weight,

55-70 parts by weight of methylene diphenyl diisocyanate,

20-30 parts by weight of polyol, and

10 to 15 parts by weight of propylene carbonate as stabilizer and viscosity enhancer.

And the curing agent of the surface coating composition for polyurea-based structural material of the present invention, based on a total of 100 parts by weight,

-30 to 70 parts by weight of polyoxypropylene diamine,

10-20 parts by weight of polyethertriamine,

-5 to 10 parts by weight of diethyltoluenediamine,

8 to 27 parts by weight of a secondary amine,

-2 to 5 parts by weight of propylene glycol,

1 to 2 parts by weight of propyltrimethoxysilane,

-2-3 parts by weight of pigment, and

-Contains 2 to 3 parts by weight of a UV absorber.

Polyols used in the subject of the present invention include polyoxypropylene glycol, sorbitol, glycerol, pentaerythritol, ethylene glycol and the like, and one or more selected from these groups can be used.

The main theme is that methylene diphenyl diisocyanate is metered into the reactor, the temperature of the reactor is gradually raised to 60 ° C, the polyol is added to the reactor in small portions, and the temperature of the reactor is raised to 80 ° C, followed by reaction at this temperature for 2 hours. After gradually cooling to room temperature, propylene carbonate is added to the obtained reaction product, and is obtained by uniformly stirring for 30 to 45 minutes.

Here, the input amount of the polyol added in small amounts should be 0.5 L / min, which is to prevent the rapid reaction with the methylene diphenyl diisocyanate.

The curing agent is based on 100 parts by weight in total, 30 to 70 parts by weight of polyoxypropylene diamine, 10 to 20 parts by weight of polyethertriamine, 5 to 10 parts by weight of diethyltoluenediamine, and 8 to 27 parts by weight of secondary amine. , 2 to 5 parts by weight of propylene glycol, 1 to 2 parts by weight of propyltrimethoxysilane, 2 to 3 parts by weight of pigment, and 2 to 3 parts by weight of UV absorber at room temperature for about 15 to 25 minutes, and then at 100 to 120 ° C. Obtained by stirring for 1 hour.

Examples of the secondary amines used in the curing agent of the present invention include diphenylamine, diethylamine, pyridine, pyrrolidine, and the like. One or more kinds selected from these groups can be used.

In the present invention, propylene carbonate is used as a stabilizer, and chlorobenzotriazole is used as a UV absorber.

In addition, the present invention is to remove the foreign matter and dust adhering to the concrete base surface by high pressure water washing or grinding treatment to dry the concrete so that the moisture content is less than 8%; After cleaning the base surface, the mixing of the main body and the curing agent uniformly for 3 to 5 minutes in a mixer maintaining a temperature of 60 ~ 70 ℃, the concrete comprising a step of applying to the arranged base surface, such as concrete, steel and wood A method of treating the surface of a structural material is provided.

Here, the mixing ratio of the main material and the curing agent is characterized in that 7: 3 (v / v). If the amount of the curing agent is greater than the above ratio, the curing agent is cured during stirring. If the amount of the curing agent is less than the above analogy, the curing time is slowed, so the reaction rate of the polyurea becomes slow.

If there is a dent on the concrete base surface before applying the repair agent, silica sand is applied there.

In addition, when steel, wood, etc. have already been degraded before applying the surface coating agent, the surface of the steel and wood surface is polished by sandpaper or the like to clean up the surface.

Structural surface coating composition of concrete, steel, wood, etc. according to the present invention is a two-component polyurea-based rapid curing agent to form a coating on the surface of the concrete to deteriorate or newly poured to form a rapid coating film on the cured concrete surface by waterproofing or Can be used for protection purposes.

In addition, the surface coating composition for structural materials of the present invention has a low viscosity to penetrate deeply into the floor quickly, such as concrete, has the effect of forming a strong resistance to maintain a long term adhesion.

In addition, since the surface coating composition for structural materials of the present invention can be used in combination with industrial quartz, sand, gravel, silica sand, etc. can improve the durability of the concrete.

In addition, the surface coating composition for structural materials of the present invention is coated on the surface of steel, wood, etc. in a fast curing type is excellent for the surface coating of steel and wood having excellent durability even in various deteriorated environmental conditions of the outside.

1 is a schematic view of an apparatus for mixing and applying a subject and a curing agent in accordance with the present invention.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a surface coating composition for reinforcement of concrete used to solve the problem of fragments repair, recoating, floor crack repair, dropping and cracking of floor concrete such as factories, offices, restaurants, hospitals, and clean rooms, The surface coating composition for structural materials according to the present invention is composed of a main material and a curing agent.

The subject matter according to the invention comprises propylene carbonate as methylenediphenyl diisocyanate, polyol, stabilizer and viscosity enhancing agent, and the curing agent according to the invention is polyoxypropylene diamine, polyether triamine, Diethyltoluene diamine, Secondary amine, Secondary amine, Propylene glycol, Propyltrimethoxysilane, Pigment, UV absorber.

The subject matter includes 55 to 70 parts by weight of methylenediphenyl diisocyanate, 20 to 30 parts by weight of polyol, 10 to 15 parts by weight of propylene carbonate as stabilizer and viscosity enhancer, based on a total of 100 parts by weight.

The curing agent, based on 100 parts by weight in total, 30 to 70 parts by weight of polyoxypropylene diamine, 10 to 20 parts by weight of polyethertriamine, 5 to 10 parts by weight of diethyltoluenediamine, 8 to 27 parts by weight of secondary amine, 2 to 5 parts by weight of propylene glycol, 1 to 2 parts by weight of propyltrimethoxysilane, 2 to 3 parts by weight of pigment, and 2 to 3 parts by weight of UV absorber.

According to the present invention, the main subject is methylene diphenyl diisocyanate is metered into the reactor and the temperature of the reactor is gradually raised to 60 ℃, polyol is added to the reactor in small amounts and the temperature of the reactor to 80 ℃, then After reacting for 2 hours at a temperature, the mixture is gradually cooled to room temperature, and then, propylene carbonate is added to the obtained reaction product, and then prepared by stirring uniformly for 30 to 45 minutes.

Here, the input amount of the polyol added in small amounts is characterized in that 0.5L / min.

The polyol is added to the reactor by measuring the methylene diphenyl diisocyanate and raising the temperature of the reactor to 60 ℃, the polyol is added slowly in small amounts. Preferably the polyol should be added in an amount of 0.5 L / min.

According to the present invention, the reactor used when manufacturing the subject is installed on the outer wall of the jacket, by slowly supplying steam or hot water to the jacket to gradually increase the temperature of the reactor. Increasing the temperature by slowly supplying the steam or hot water may cause the reaction product to vary depending on the reaction temperature, and when it is added at a time, it is difficult to control the temperature in a subsequent process.

In addition, the reaction for 2 hours at the temperature of 80 ℃ of the reactor is because the reaction product of the present invention can not be obtained when the reaction time is less than this or for a long time. That is, the conditions of the reaction temperature and the reaction time are for the polymerization of methylene diphenyl diisocyanate and polyol to secure optimum adhesion and tensile strength and control of curing time.

For example, when the main body and the curing agent react to form a coating film, when the amount of the main body is less than a certain amount and the amount of the curing agent is more than a certain amount, the coating film properties desired in the present invention cannot be exhibited when forming the coating film, and If the amount of the main body is greater than a certain amount and the amount of the curing agent is less than the predetermined amount, the physical properties of the desired coating film may not be exhibited due to the remaining main material which does not react when forming the coating film.

Thus, the reaction here is to make the amount of subject matter most suitable when reacting with the curing agent.

Here, the amount means the production amount of the isocyanate (Isocyanate), the reaction temperature and the reaction time disclosed in the present invention is to create the optimum conditions for making the isocyanate in accordance with the object of the present invention. This reaction is instantaneous and the equation is different:

Urea Reaction Mechanism

In the above scheme, R and R 'represent aliphatic or aromatic groups.

According to the present invention, the reactor is reacted at 80 ° C. for 2 hours, and then cooled slowly. At this time, cooling water is slowly added to a jacket outside the reactor to check the temperature of the reactor.

As described above, the concrete surface treatment method and the steel surface coating using the surface coating composition for structural materials of the present invention will be described as follows. However, this invention is not limited by the following description.

According to the present invention, in order to apply to the concrete surface, the surface of the concrete is first subjected to high pressure water washing or grinding treatment to completely remove foreign substances and dust adhering to the concrete base surface and to dry the water content to 8% or less. This is to increase the penetration force of the repair agent penetrates the concrete surface by completely removing foreign substances such as dust and dirt adhering to the base surface. At this time, the concrete is ground and / or ground according to the flatness and the slope of the concrete.

After rearranging the base surface, the main body and the curing agent are stirred and mixed uniformly for 3 to 5 minutes in a mixer maintained at 60 to 70 ° C, and then applied to the summarized base surface. At this time, the coating of the surface coating composition for structural materials according to the present invention is applied by spray coating method by a spray gun.

In addition, in order to apply to the surface of steel or wood, in the case of steel, first, the rust generated on the surface of steel is polished with sandpaper to remove foreign substances remaining on the surface of steel, and then dried sufficiently at room temperature to reduce the moisture content of the surface to 8% or less. Shall be.

After rearranging the base surface, the main body and the curing agent are uniformly stirred and mixed at a volume ratio of 7: 3 for 3 to 5 minutes in a mixer maintaining a temperature of 60 to 70 ° C, and then applied to the ground surface. At this time, the coating of the surface coating composition for structural materials according to the present invention is applied by spray coating method by a spray gun.

The application of wood surfaces also conforms to the surface treatment criteria for steel or concrete.

On the other hand, it is important to stir and mix so that the mixing ratio of the main material and the curing agent used in the surface treatment method is 7: 3 (v / v).

According to the present invention, in the concrete surface finish, it may further comprise the step of applying the silica sand in the recessed portion of the concrete base surface before applying the surface coating composition for the structural material on the surface. This is to reinforce the deep hole is a problem that must be applied several times the composition of the present invention.

The surface coating composition for structural materials of the present invention described above is a two-component polyurea-based rapid curing agent to form a coating on the surface of concrete, steel or wood to form a rapid coating film on a sufficiently cured concrete surface after deterioration or newly poured By forming a rapid protective coating film on the surface of the steel or wood, it can be used for concrete waterproofing or protection of steel or wood for various purposes.

In addition, the surface coating composition for structural materials of the present invention has a low viscosity to penetrate quickly and deeply into the floor, such as concrete to maintain the adhesion to form a strong resistance.

In addition, the surface coating composition for structural materials of the present invention can be used in combination with industrial quartz, sand, gravel, silica sand and the like to improve the durability of the concrete has the effect of showing the strong physical properties for the surface finish of the concrete.

Hereinafter, an Example is given and this invention is demonstrated in detail. However, the present invention is not limited by the embodiments of the present invention.

Example 1

(Production of the subject)

70 kg of methylenediphenyl diisocyanate was placed in the reactor, and the temperature of the reactor was gradually raised to 60 ° C. over about 30 minutes, and then 20 kg of polyoxypropylene glycol was added to the reactor at a rate of 0.5 L / min, and the temperature of the reactor was increased. After heating up to 80 degreeC, it was made to react at this temperature for 2 hours, and after cooling to room temperature gradually, 10 kg of propylene carbonate was added to the obtained reaction material, and it stirred uniformly for 30 minutes, and obtained 100 kg of main materials.

(Production of Hardeners)

70 kg of polyoxypropylene diamine, 10 kg of polyethertriamine, 5 kg of diethyltoluenediamine, 8 kg of diphenyl amine, 2 kg of propylene glycol, 1 kg of propyltrimethoxysilane, 2 kg of chromium green pigment, alpha as UV absorber 100 kg of hardener was obtained by putting 2 kg of amino ketones into a container and mixing and stirring uniformly for 10 minutes at a rotation speed of 60 rpm.

Examples 2 to 5

The main body and the hardener were prepared in the same manner as in Example 1 except that the content of the main body and the curing agent was changed as in Table 1 below.

material Composition Example One 2 3 4 5 subject Methylene diphenyl diisocyanate 70 60 55 70 60 Polyoxypropylene glycol 20 25 30 20 25 Propylene carbonate 10 15 15 10 15 Sum 100 100 100 100 100 Hardener Polyoxypropylenediamine 70 60 50 40 30 Polyethertriamine 10 10 15 20 20 Diethyltoluenediamine 5 6 7 8 10 Secondary amines (diphenyl amines) 8 11 19 22 27 Propylene glycol 2 5 3 4 5 Propyltrimethoxysilane One 2 2 2 2 Chrome green pigment 2 3 2 2 3 Alpha amino ketones (UV absorbers) 2 3 2 2 3 Sum 100 100 100 100 100

Test Example 1

After separating the main body and the curing agent obtained in Example 1, respectively, and storing them in separate storage tanks, a high temperature and high pressure hose for maintaining 7 liters of the liquid main body and 3 liters of the liquid curing agent stored in each storage tank at 70 ° C. Sprayed with a spray gun in an instantaneous impingement mixture and applied 3 mm thick to the ground concrete surface. This process is shown in FIG. The applied coating film takes 10 seconds to naturally dry at room temperature. Solid content of the composition obtained in Example 1 is 87 weight%.

The adhesive strength, hardness, tensile strength and elongation of the coating film coated on the concrete surface were measured according to the standard of KS F 4209 and the results are shown in Table 2 below.

Test Examples 2 to 5

The drying time, solid content, adhesive strength, hardness, tensile strength and elongation were measured in the same manner as in Test Example 1, except that the compositions obtained in Examples 2 to 5 were used, respectively. The results are shown in Table 2 below.

Comparative Example 1

Using a commercially available A company (polyurea), the spray gun is spray-coated to a concrete surface of 3 mm thick on the surface of the concrete treated by the hot and high pressure impact mixing method. It takes 15 seconds for the applied coating to naturally dry at room temperature. Solid content of A company product is 99 weight%.

Comparative Example 2

Using a commercially available B company (vinyl chloride resin), the spray gun is spray-coated to a surface of concrete, which has been ground by the impact mixing method at room temperature, in a thickness of 3 mm. It takes 3 minutes to dry naturally at room temperature. Since B company product is a vinyl chloride resin, there is no measurement result for solid content.

The adhesive strength, hardness, tensile strength and elongation of the coating film coated on the concrete surface were measured according to the standard of KS F 4209 and the results are shown in Table 2 below.

Drying time
(second) Adhesive strength
(MPa) Shore hardness
(D) The tensile strength
(MPa) Elongation
(%) Solid content
(w%) Test Example 1 10 13.8 71 31 228 87 Test Example 2 15 12.1 68 28 265 88 Test Example 3 40 12.4 67 26 288 90 Test Example 4 30 13.6 70 30 257 89 Test Example 5 20 12.9 70 27 299 88 Comparative Example 1 15 12.0 59 25 227 99 Comparative Example 2 3 minutes 10.9 65 10 210 -

As shown in Test Examples 1 to 5 of Table 2, the solids of the compositions obtained in Examples 1 to 5 according to the present invention are all 90% by weight or less, while the solids of the composition of Comparative Example 1 is 99% by weight.

Although the solid content of the coating film coated according to the present invention is at least 9% by weight or less than that of Comparative Example 1, the coating film according to the present invention has an equivalent or more than that of Comparative Example 1 in terms of adhesive strength, hardness, tensile strength and elongation. It can be seen that it has excellent physical properties. Since the thing of the comparative example 2 is a vinyl chloride resin, solid content cannot be measured.

As such, despite the fact that the solid content of the coating film according to the present invention is about 10% lower than that of the conventional one, the fact that the adhesive strength, the hardness, the tensile strength and the elongation ratio become equal or more is unpredictable in the art. It represents.

Claims (9)

The subject matter containing propylene carbonate as methylenediphenyl diisocyanate, polyoxypropylene glycol, stabilizer and viscosity enhancer; And a curing agent containing polyoxypropylene diamine, polyethertriamine, diethyltoluene diamine, diphenylamine, propylene glycol, propyltrimethoxysilane, pigment, and UV absorbing agent. The method of claim 1,
The main value includes 55 to 70 parts by weight of methylene diphenyl diisocyanate, 20 to 30 parts by weight of polyoxypropylene glycol, 10 to 15 parts by weight of propylene carbonate as a stabilizer and viscosity enhancer; And
The curing agent is based on 100 parts by weight in total, 30 to 70 parts by weight of polyoxypropylene diamine, 10 to 20 parts by weight of polyethertriamine, 5 to 10 parts by weight of diethyltoluenediamine, 8 to 27 parts by weight of diphenylamine, and propylene. 2 to 5 parts by weight of glycol, 1 to 2 parts by weight of propyltrimethoxysilane, 2 to 3 parts by weight of pigment and 2 to 3 parts by weight of UV absorber, the surface coating composition for polyurea structural material. delete delete The method of claim 1,
The mixing ratio of the main material and the curing agent is 7: 3 (v / v), the surface coating composition for polyurea-based structural material. After putting methylenediphenyl diisocyanate into the reactor, the temperature of the reactor was gradually raised to 60 ° C., polyoxypropylene glycol was added to the reactor in small portions, and the temperature of the reactor was increased to 80 ° C., followed by reaction at this temperature for 2 hours. The method for producing the main body according to claim 1 by gradually cooling to room temperature, and then adding propylene carbonate to the obtained reaction product and stirring it uniformly for 30 to 45 minutes. The method according to claim 6,
A process for producing a subject according to claim 1, characterized in that the feed rate of polyoxypropylene glycol is 0.5 L / min. A high pressure water washing or grinding process to completely remove foreign substances and dust from the concrete base surface and to dry the water content to 8% or less; After the base surface clean up, concrete comprising a step of uniformly stirring the main body and the curing agent according to claim 1 in a mixer maintaining a temperature of 60 ~ 70 ℃, the step of applying to the clean up the base surface, Method of surface coating of steel and wood structural materials. The method of claim 8,
The mixing ratio of the main material and the hardener is 7: 3 (v / v).

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