KR101772903B1 - Composition for polyurea waterproofing layer with high durability - Google Patents

Abstract

The present invention relates to a composition for a polyurea waterproofing layer having mechanical and thermal properties for protection and water tightness of the outer wall surface of a concrete structure. The composition for a polyurea waterproofing layer is obtained by mixing: a prepolymer component (A) by a reaction of isocyanate and polyol in which a mole ratio of isocyanate and polyol is 10 : 1-15 : 1; a curing agent component (B) reacting with a terminal according to a terminal component of the prepolymer component (A); and carbon milled fiber ground from carbon fibers.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyurea coating film having a high durability,

The present invention relates to a polyurea coating material waterproofing composition containing mechanical and thermal properties for protecting and waterproofing the outer wall surface of a concrete structure.

In general, waterproof materials used for construction and civil structure protection systems include sheet-type waterproofing materials and coating-type waterproofing materials.

Among them, the sheet type waterproofing construction is uniform and has excellent waterproofing effect, but it is costly, it is difficult to connect the sheets in the construction process, and the waterproofing function is lost due to the water leakage at the connection part.

On the other hand, the coating type waterproofing construction is capable of continuous construction without connecting parts, and is relatively easy to repair, and is relatively easy to install in a narrow or complex area, and has excellent performance in terms of effectiveness.

Epoxy resin system, polyurethane system, etc. are generally used as a waterproof material used for coating waterproofing for construction and civil engineering.

Here, the epoxy resin system is used as a flooring material for various sites such as parking lots, factories, and various concrete facilities. Epoxy resin systems used for flooring are excellent in chemical resistance, impact resistance, adhesive strength, mechanical strength, durability, The bisphenol A and the bisphenol F contained in the epoxy resin composition remain in the epoxy resin-based resin composition, which may cause a serious adverse effect on the human body. In addition, The impact resistance and the bending resistance are lowered, so that there is a high possibility that damage due to the impact or partial peeling on the bent portion is high.

In addition, the polyurethane system generally forms a coating film by reaction of a polyol-based compound with isocyanate. In the reaction, an appropriate catalyst and a curing agent are generally added. In general, the expansion and contraction of the structure causes the tearing and leakage However, it is disadvantageous in that tearing or rupture is easily caused by continuous external factors because the durability of the coating film is deteriorated.

In recent years, the abrasion resistance and the durability are better than those of the polyurea type due to the bonding of the carbon (C) and the nitrogen (N) in the carbonyl group (C = 0) present in the urea bond and the moisture resistance and heat resistance are stronger Polymer coatings that are more stable in three dimensions and have elasticity, acid resistance, alkali resistance, chemical resistance and ultraviolet rays are used.

Such a polyurea system is characterized by rapid curing of a material coated on the site using an ultra-rapid curing reaction of an isocyanate prepolymer and an amine mixture.

As a related art related to such a polyurea coating film waterproofing material, Korean Registered Patent No. 10-1024534 (Mar. 31, 2011) discloses a waterproofing material for a polyurea based coating film, which comprises a waterproofing agent for applying an adhesive containing a moisture-curing polyurethane to a surface of a concrete structure, A step of applying a mesh-type carbon fiber sheet in which a breathable mesh-type carbon fiber sheet is installed to prevent the coating film from being lifted or bulged, and a waterproofing agent containing an acrylate copolymerized modified resin and an isocyanate prepolymer, A first intermediate application step for forming a waterproof layer, a middle secondary application step for applying a high-temperature and high-pressure polyurea waterproofing agent by a discharge injection method to form a middle secondary waterproof layer, a top coating for preventing the intermediate yellowing phenomenon caused by ultraviolet rays And a top coat step of forming a top coat layer by coating (Korean Unexamined Patent Publication No. 10-0397812 (2003.09.13) discloses a composite waterproofing method using a polyurea film waterproofing agent characterized in that a surface of a surface-treated concrete structure is spray-coated with a resin A concrete surface for a polyurea spray coating which forms a primer layer, forms a paste layer on the surface of the primer layer, forms a primer layer again before the paste is completely cured, and finally forms a coating with a polyurea resin However, when a filler or the like is added to improve the physical properties of the polyurea coating film, the polyurea paint has a very high reactivity and the high cohesiveness of the filler in the polyurea coating, It is impossible or impossible to use these coating waterproofing agents on the rooftops of buildings In the case of continuous exposure to sunlight, it is required to have long-term heat resistance, but such long-term heat resistance and mechanical properties can not be sufficiently provided, and therefore, there is a problem in need of improvement.

Therefore, there is a continuing need for development of a polyurea coating film waterproofing composition which has long-term heat resistance, spray coating, and improved chemical resistance and mechanical properties.

Korean Patent No. 10-1024534 (Mar. 31, 2011) Korean Patent No. 10-0397812 (2003.09.13.)

The main object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to provide a coating film waterproofing composition on the surface of a concrete structure, which is capable of spraying with a long-term heat resistance but also exhibits improved chemical resistance and mechanical properties. Compositions and methods for their formation.

Another object of the present invention is to provide a polyurea waterproof coating film formed by a method of forming a waterproof coating film using the polyurea on the surface of a concrete structure.

In order to achieve the above object, the present invention relates to a prepolymer component (A) by reaction of isocyanate with a polyol; A curing agent component (B) capable of reacting with the terminal group in accordance with the terminal group component of the prepolymer component (A); Wherein the polyurea coating film waterproofing material composition contains 0.5 to 4% by weight of carbon milled fiber based on the prepolymer component (A), or the curing agent component (A) B) 0.5 to 4% by weight, based on the components of the composition, of carbon-core-fiber fibers.

In a preferred embodiment of the present invention, the molar ratio of the isocyanate to the polyol may be from 6: 1 to 20: 1.

In one preferred embodiment of the present invention, the curing agent component (B) may be any one selected from monoamine, diamine, and triamine, or a mixed component thereof.

In a preferred embodiment of the present invention, the ratio of the sum of the polyols in the prepolymer component (A) and the amine in the curing agent component (B) may be 5: 1 to 20: 1.

In a preferred embodiment of the present invention, the carbon fiber can have an average fiber length of 10 to 80 mu m.

In one preferred embodiment of the present invention, the isocyanate is selected from the group consisting of methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI) (HDI MDI) and alicyclic diisocyanate (XDI) in which hydrogen is added to the benzene ring of MDI to form a benzene ring of benzene ring of diisocyanate (MXDI), tetramethylxyylene diisocyanate (TMXDI) And diisocyanates made by alicyclic groups (hydrogenated XDI).

In a preferred embodiment of the present invention, the polyol may be at least one selected from the group consisting of a phthalate-based diol, a polyether polyol, a polyester polyol, a polycarbonate polyol, a polycaprolactone polyol, a polybutadiene polyol and an alkyd polyol .

In a preferred embodiment of the present invention, in addition to the curing agent component (B) in the step (ii), a pigment or an antioxidant may be included.

In a preferred embodiment of the present invention, the pigment or the antioxidant may be mixed in an amount of 1 to 3% by weight based on the curing agent component (B).

The present invention also relates to a process for the preparation of a prepolymer composition comprising: (i) obtaining a prepolymer component (A) by reaction of an isocyanate with a polyol; (ii) preparing a curing agent component (B) capable of reacting with the terminal group according to the terminal group component of the obtained prepolymer component (A); (iii) mixing the carbonyldide fiber with the prepolymer component (A) or the curing agent component (B); (iv) mixing the carbon-mixed fiber-mixed component with the other components to be reacted to obtain a polyurea resin composition; And (v) applying the obtained polyurea resin composition to a surface to be waterproof coated, wherein the carbonized fiber has a prepolymer component (A) or a curing agent component ( B) in an amount of 0.5 to 4% by weight based on each component of the polyurea coating film.

The present invention also provides a polyurea coating material waterproofing material obtained by the above-described method of forming a polyurea coating material waterproofing material.

The polyurea coating material waterproofing material formed by the method according to the present invention is superior in the tensile strength of the coating film to that of the coating film waterproofing material according to the prior art even though it has long term heat resistance to the absorption of the sun or radiant heat for a long time, Mechanical properties such as elongation and durability can be improved. Thus, breakage of the coating film due to repeated shrinkage and expansion caused by temperature difference can be prevented, waterproof function can be maintained, and the service life of the coating film can be extended.

Further, the method of forming a polyurea coating material according to the present invention is advantageous in that it is possible to perform spraying work, thereby improving work efficiency in forming a coating film.

1 is a flowchart showing a method of forming a polyurea coating material waterproofing material according to an embodiment of the present invention.

Hereinafter, a method of forming a paintable polyurea coating material by spraying according to the present invention will be described in detail so that those skilled in the art can easily carry out the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. And the constitution shown in the drawings are only the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents and variations Examples should be understood.

The polyurea coating material waterproofing material composition according to the present invention comprises a prepolymer component (A) by reaction of isocyanate with a polyol; A curing agent component (B) capable of reacting with the terminal group in accordance with the terminal group component of the prepolymer component (A); Wherein the polyurea coating film waterproofing material composition contains 0.5 to 4% by weight of carbon milled fiber based on the prepolymer component (A), or the curing agent component (A) And 0.5 to 4% by weight, based on the components of the carbon fibers (B).

The carbon milled fiber is obtained by pulverizing carbon fibers to give a short fiber like a powder. The carbon milled fiber is excellent in dispersibility and fluidity even in the prepolymer component (A) or the curing agent component (B), and has excellent corrosion resistance, abrasion resistance, , Mechanical properties such as durability and chemical properties can be reinforced.

In the present invention, the carbon-milled fiber may be a carbon-milled fiber having an average fiber length of 10 to 80 탆, and preferably a carbon-milled fiber having an average fiber length of 10 to 40 탆. If the average fiber length of the carbon-mond fiber is less than 10 탆, problems such as workability may be caused due to poor dispersibility and viscosity of the product due to its small size. If the average fiber length exceeds 80 탆, The lack of denseness may lead to problems of tensile performance and surface defects of the coating film.

The carbon-carbon fiber is preferably mixed with 0.5 to 4 wt%, more preferably 1 to 3 wt%, of each component of the prepolymer component (A) or the curing agent component (B) It is preferable to mix the prepolymer component with the curing agent component.

If the content of the carbon-core fiber is less than 0.5% by weight with respect to the components of the prepolymer component (A) and the curing agent component (B), the effect is insignificant compared to the amount added. If the content exceeds 4% by weight, And color problems may arise. Also, since the increase in the physical properties is relatively small, it is preferable to mix the components in the above range.

Further, in the present invention, a solvent may additionally be added to the prepolymer component (A) or the curing agent component (B) in order to improve the dispersibility of the carbon-milled fiber. The solvent used herein may be an aromatic hydrocarbon such as toluene or xylene, or an aliphatic amide compound such as dimethylformamide or dimethylformacetamide.

The coating film prepared by applying the polyurea coating film-containing waterproofing composition containing the carbon-core fiber described above can have long-term heat resistance and can improve mechanical properties such as tensile strength and the like, It is possible to spray work while having long term heat resistance and improved mechanical properties, thereby improving work efficiency in forming a coating film for a waterproofing material.

The present invention also provides a method of forming a polyurea coating material waterproofing material using the polyurea composition. More specifically, it comprises: (i) obtaining a prepolymer component (A) by reaction of isocyanate with a polyol; (ii) preparing a curing agent component (B) capable of reacting with the terminal group according to the terminal group component of the obtained prepolymer component (A); (iii) mixing the carbonyldide fiber with the prepolymer component (A) or the curing agent component (B); (iv) mixing the carbon-mixed fiber-mixed component with the other components to be reacted to obtain a polyurea resin composition; And (v) applying the obtained polyurea resin composition to a surface on which a waterproof coating film is to be formed, wherein the carbon-core fiber is prepared by mixing each component (A) of the prepolymer component (A) By weight based on the total weight of the composition.

This will be described in more detail with reference to FIG.

The method for forming a polyurea coating material waterproofing material according to the present invention includes, as a first step, a step (i) of obtaining a prepolymer component (A) by reaction of an isocyanate and a polyol.

Here, the prepolymer component (A) may be a polymer compound having a low molecular weight or an oligomer form obtained by the reaction of an isocyanate and a polyol, and may have a form in which both terminals are bonded with an isocyanate group.

On the other hand, the polyurea used in the present invention is different from the polyurethane used for the waterproof flooring as a conventional material, and there is a difference in the content of the amine series used as the composition of the prepolymer and the curing agent, The use may vary.

At this time, the ratio of isocyanate to polyol in step (i) is 6: 1 to 20: 1 Molar ratio, and more preferably from 10: 1 to 15: 1 molar ratio.

If the amount of the isocyanate is less than 6 moles per mole of the polyol, the reaction between the isocyanate and the hydrogen donor is slowed, and the curing time is long and uncured. If the amount of the isocyanate exceeds 20 moles, The coating film of the composition becomes rigid and can not withstand the deformation due to expansion and contraction of the structure, so that the phenomena such as swelling, cracking, lifting and peeling may occur.

The reaction of the isocyanate with the polyol may be carried out in a solvent or may be carried out by reacting each monomer under an appropriate viscosity even in a solvent-free environment. In this case, a tertiary amine, an aprotic salt, or an organometallic compound may be used as a catalyst.

Examples of the isocyanate used for preparing the prepolymer component include methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), meta xylene di Hydrogen is added to the benzene ring of diisocyanate (H12 MDI) and xylene diisocyanate (XDI) made of alicyclic group by adding hydrogen to isocyanate (MXDI), tetramethylxylene diisocyanate (TMXDI), benzene ring of MDI, And a diisocyanate (hydrogenated XDI) made of an alicyclic group.

The polyol may be at least one selected from the group consisting of a phthalate diol, a polyether polyol, a polyester polyol, a polycarbonate polyol, a polycaprolactone polyol, a polybutadiene polyol and an alkyd polyol. In addition to the polyol, Donors can be used.

The second step in the present invention is a step of preparing a curing agent component (B) capable of reacting with the terminal group in accordance with the terminal group component of the prepolymer component (A) obtained above (step (ii)).

Here, in the case of polyurea, in general, almost all of the terminal groups of the prepolymer component are capped with isocyanate, so that an amine compound capable of reacting with the isocyanate can be used as a curing agent component.

Here, the curing agent component (B) may be any one selected from monoamine, diamine, and triamine, or a mixed component thereof.

Further, the curing agent component (B) may further contain a pigment or an antioxidant so as to exhibit a color of a coating film or to have oxidation resistance, and the pigment or antioxidant may be added to the curing agent component (B) 3% by weight can be added and mixed.

Usually, the antioxidant has a function to prevent the oxidation of monomolecular organic compounds, polymers and the like, and is contained as an additive in most of the polymers. The present invention also functions to prevent the oxidation of the polyurea produced by the curing reaction by the curing agent.

As the antioxidant in the present invention, a compound containing a phenol group containing a bulky alkyl group in the molecule may further include an aromatic heterocycle having 2 to 12 carbon atoms. As an example of such a heterocyclic ring, pyridine Based, pyrimidine-based, and triazine-based compounds.

The third step in the present invention is a step (step (iii)) of mixing a carbon-doped fiber with the prepolymer component (A) or the curing agent component (B) described above, wherein the types and characteristics of the carbon- Same as.

The fourth step in the present invention is a step of mixing the carbon-mixed fiber with the other components to be reacted to obtain a polyurea resin composition (step (iv)).

When the component mixed with the carbon-core fiber is a prepolymer component (A), it is mixed with the curing agent component (B) to prepare a polyurea. When the component mixed with the carbon-core fiber is a curing agent component (B) (A) to prepare a polyurea.

The ratio of the sum of the polyols in the prepolymer component (A) and the curing agent component (B) in the step (iv) may be 5: 1 to 20: 1.

Generally, when polyurea is produced and used as a waterproofing agent, the prepolymer component (A) and the curing agent component (B) are prepared in advance according to desired physical properties, and then the prepolymer component and the curing agent component are mixed .

That is, the carbon-doped fiber of the present invention can be mixed with the prepolymer component (A) or the curing agent component (B), and the prepolymer component (A) or the curing agent component (B) The polyurea resin composition can be prepared by mixing with the other components to be reacted at the site where the desired surface is located.

The final step in the method of forming a polyurea coating material waterproofing material in the present invention is a step (step (v)) of applying the obtained polyurea resin composition to a surface on which a coating film is to be formed, And forming a coat layer by a method such as spraying using the polyurea resin composition prepared on the surface.

The present invention also provides a polyurea coating material waterproofing material obtained by the above-described method for forming a polyurea coating material waterproofing material, which is a coating waterproofing material obtained by forming a coating film using the above-described polyurea coating material waterproofing composition, And preferably on top of the primer layer formed on the concrete surface.

As a more detailed step of the method of forming the polyurea waterproof coating film using the polyurea resin composition, there is a step of repairing and cleaning the surface of the concrete to perform a surface treatment so as to treat the coating film; Forming a primer layer on the concrete surface; Forming a waterproof layer on the primer layer by the polyurea coating material waterproofing material of the present invention as a middle layer; And forming an upper layer of an ingredient which does not cause discoloration or deformation on ultraviolet rays on the intermediate layer.

The surface treatment step of the concrete layer may include a step of treating the surface of the concrete structure such that cracks, leakage, and water are reinforced on the bottom layer of the concrete structure or that the primer penetration into the bottom layer of the concrete structure is facilitated. And the like, and is usually omitted when the surface is clean.

For example, the primer layer may include a moisture-curing isocyanate-terminated urea polymer. The isocyanate-terminated urea polymer may be used in an amount of 40 to 60 wt% And 40 to 60 wt% of a diluent may be used.

In addition, the primer layer may be coated on the concrete surface by a method of coating with a roller, a brush, an airless spray or the like in a manner of forming a solid coating film by reacting with moisture in concrete or a mother body.

It is preferable that the coating thickness of the primer layer is within the range of 0.05 to 0.2 mm. If the thickness of the primer layer is 0.2 mm or more at one time of coating, The moisture of the background can not be effectively discharged, and cracks may occur when the transient is over 0.3 mm.

As a subsequent step, the step of forming the coating film-waterproofing material obtained by using the polyurea coating material waterproofing composition of the present invention as the intermediate layer may be carried out by mixing the prepolymer component (A) obtained by the reaction of the isocyanate and the polyol and the curing agent The component (B) is polymerized to obtain a polyurea resin composition, wherein the carbon-mold fiber is contained in either the prepolymer or the curing agent component. As a subsequent step, the obtained polyurea resin composition is uniformly applied using a brush, a roller, an airless sprayer or the like to form a waterproofing intermediate layer, and preferably a spraying process can be used.

As a subsequent step, the upper layer forming step may form an upper layer with a component composed of acrylic, acryl urethane, fluorine, silicon or the like which does not cause discoloration or deformation by ultraviolet rays on the intermediate layer, Or the like.

Specifically, a mixture of a mixture of 60 to 90 wt% of a urea acrylate resin, 5 to 20 wt% of a color pigment and 5 to 15 wt% of a color pigment, 0.1 to 2 wt% of an additive, and a prepolymer having a functional group of isocyanate, And the mixture is maintained at an equivalent ratio of 1: 0.8 to 1: 1.2. Then, the mixture is uniformly applied using a spray device.

In the present invention, there is no particular limitation on the coating method of the upper layer. For example, a spray or a roller may be used to coat the upper coat layer so that the dry film thickness is preferably 50 占 퐉 or more. Further, the upper layer may not be formed if necessary.

The method of forming a polyurea waterproof coating film according to the present invention is a method of easily coating a polyurea waterproof coating film having improved mechanical properties such as tensile strength, elongation, durability and the like while having long-term heat resistance for absorption of long- can do.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by those skilled in the art that these embodiments are only for illustrating the present invention and that the scope of the present invention is not construed as being limited by these embodiments.

[ Example  One]

1-1: Prepolymer  Preparation of component (A)

A prepolymer was synthesized by reacting 300 g of methylene diphenyl diisocyanate (NCO% 16.1) and 200 g of PPG (polypropylene glycol, Mw 3,000) as a catalyst and 0.01 g of phosphoric acid (H3PO4) at 80 DEG C for 6 hours. (Isocyanate: PPG molar ratio = 13: 1)

1-2: Carbon Mild  Prepare the curing agent component (B) containing fiber

A carbonyl fiber having an average fiber length of 30 占 퐉 was added to a curing agent in which 20 g of diethyltoluene diamine, 4 g of diphenylamine, 53 g of polyether diamine (Mw: 2,000) and 20 g of polyether triamine (Mw: (ZOLTEK), 1.5 g of pigment and 0.5 g of antioxidant were added thereto, and the mixture was stirred for 2 hours to prepare a curing agent component (B) containing a carbon fiber fiber having an average fiber length of 30 μm (PPG: amine molar ratio = 9.2: 1)

1-3: Polyurea  Preparation of resin composition and coating film formation

The curing agent component (B) containing the carbon-core fiber obtained in Example 1-2 was added to the prepolymer component (A) (100 g based on the isocyanate content) obtained in Example 1-1, Temperature rise of ~ 70 ℃ and spraying polyurea specimen frame at pressure of 1500Psi or more to prepare coating film specimen.

For easy release of the specimen after molding, use the specimen frame as release paper and keep the thickness of the specimen at 3 mm. In order to maintain the temperature condition of the specimen, it was cured in a constant temperature chamber of 25 ℃ for 168 hours, and then it was left in a 60 ℃ oven for full curing for 24 hours to prepare the film specimen completely.

[ Example  2]

In the preparation of the curing agent component (B) in Example 1-2, the content of the polyether diamine (Mw: 2,000) was adjusted to 51 g, the content of the carbon fiber fiber having an average fiber length of 30 탆 was adjusted to 3 g, (B) were prepared in the same manner as in Example 1-1, and coating film specimens were prepared in the same manner as in Examples 1-1 to 1-3.

[ Example  3]

In preparing the curing agent component (B) in Example 1-2, the content of the polyetherdiamine (Mw: 2,000) was adjusted to 51 g, the content of the carbon-milled fiber having an average fiber length of 50 탆 was adjusted to 3 g, (B) were prepared in the same manner as in Example 1-1, and coating film specimens were prepared in the same manner as in Examples 1-1 to 1-3.

[ Example  4]

In preparing the curing agent component (B) in Example 1-2, the content of the polyetherdiamine (Mw: 2,000) was adjusted to 51 g, the content of the carbon fiber having an average fiber length of 120 m was adjusted to 3 g, (B) were prepared in the same manner as in Example 1-1, and coating film specimens were prepared in the same manner as in Examples 1-1 to 1-3.

[ Comparative Example  One]

In the preparation of the curing agent component (B) in Example 1-2, the content of polyether diamine (Mw: 2,000) was adjusted to 54 g, and in the absence of the carbon-milled fiber, ) Were prepared, and coating film specimens were prepared in the same manner as described in Examples 1-1 to 1-3.

[ Comparative Example  2]

In preparing the curing agent component (B) in Example 1-2, the content of polyether diamine (Mw: 2,000) was adjusted to 49 g, the content of carbon-milled fiber having an average fiber length of 30 μm was adjusted to 5 g, (B) were prepared in the same manner as in Example 1-1, and coating film specimens were prepared in the same manner as in Examples 1-1 to 1-3.

The contents of Examples 1 to 4 and Comparative Examples 1 and 2 are shown in Table 1 below.

[Evaluation of Physical Properties of Coating Film]

1. Viscosity change with temperature

The viscosity of the polyurea resin composition obtained in Examples 1 to 4 and Comparative Examples 1 and 2 was measured using a viscometer (DV-II + PRO, manufactured by BROOKFIELD Co., Ltd.) And the viscosity change according to the measurement is shown in Table 2 below.

As shown in Examples 1 to 4 of Table 2, it can be seen that the viscosity of the polyurea resin composition increases with the increase of the content of the carbon milled fiber, It can be seen that the viscosity is so increased that spraying is impossible.

2. Measurement of mechanical properties and long-term heat resistance

In order to evaluate the mechanical properties and long-term heat resistance of the coating films prepared in Examples 1 to 4 and Comparative Example 1, they were left in an oven at 25 ° C or 140 ° C for three weeks, and the tensile strength and elongation were evaluated according to KS F 4922 Table 3 shows the results.

As shown in Table 3, the waterproof coating film containing the polyurea resin composition containing the carbon-milled fiber of Examples 1 to 4 had a mechanical (mechanical) impact strength comparable to that of Comparative Example 1 (the KS F 4922 value was satisfied but the long term durability was poor) It is confirmed that excellent physical properties and excellent long-term heat resistance characteristics are obtained.

Therefore, the polyurea waterproof coating film formed by the method according to the present invention improves the mechanical properties of the coating film as well as the long-term heat resistance due to the carbon-containing fiber, so that the coating film due to repeated shrinkage and expansion And has long-term heat resistance against absorption of solar radiation or radiant heat for a long time, so that the physical properties of the coating film can be stably maintained even when exposed to a high temperature environment for a long time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention. . Accordingly, the technical scope of the present invention should be determined by the claims.

Claims (9)

A prepolymer component (A) by reaction of an isocyanate having a molar ratio of isocyanate and polyol of 10: 1 to 15: 1 with a polyol;
A curing agent component (B) capable of reacting with the terminal group in accordance with the terminal group component of the prepolymer component (A); And carbon milled fiber obtained by pulverizing carbon fibers are mixed with each other to obtain a polyurea coating film waterproofing composition,
The polyurea film coating composition contains 1 to 3% by weight of carbon-core fiber based on the prepolymer component (A), 1 to 3% by weight of a carbon-core fiber fiber based on the components of the curing agent component (B) Wherein the polyurea coating film is water-repellent. delete The method according to claim 1,
Wherein the curing agent component (B) is any one selected from the group consisting of monoamine, diamine, and triamine, or a mixture thereof. The method according to claim 1,
Wherein the ratio of the sum of the polyol in the prepolymer component (A) and the amine in the curing agent component (B) is in a molar ratio of 5: 1 to 20: 1. The method according to claim 1,
Wherein the carbon fiber fiber has an average fiber length of 10 to 80 占 퐉. The method according to claim 1,
The isocyanate may be selected from the group consisting of methylene diphenyl diisocyanate (MDI), toluene diisocyanate (TDI), hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), meta xylene diisocyanate (MXDI) (TMXDI), a diisocyanate (H12 MDI) prepared by adding hydrogen to a benzene ring of MDI and a cycloaliphatic diisocyanate (hydrogenated by adding hydrogen to a benzene ring of xylene diisocyanate (XDI) XDI). ≪ RTI ID = 0.0 > 11. < / RTI > The method according to claim 1,
Wherein the polyol is at least one selected from the group consisting of a phthalate-based diol, a polyether polyol, a polyester polyol, a polycarbonate polyol, a polycaprolactone polyol, a polybutadiene polyol, and an alkyd polyol. The method according to claim 1,
Wherein the curing agent component (B) further comprises a pigment or an antioxidant. 9. The method of claim 8,
Wherein the pigment or the antioxidant is mixed in an amount of 1 to 3 wt% based on the total amount of the curing agent component (B).

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