Room temperature curing transparent polyurea coating composition and exterior wall waterproofing method using the same

Abstract

The present invention relates to a room-temperature curable transparent polyurea coating composition and an exterior wall waterproofing method using the same. More specifically, the invention relates to a transparent polyurea coating composition in which a first agent and a second agent are mixed in a weight ratio of 1:0.5 to 1.5, wherein the first agent contains 100 parts by weight of a hexamethylene diisocyanate trimer (HDI Trimer) having an NCO content of 10 to 17 weight% and 1 to 20 parts by weight of a plasticizer, and the second agent comprises 100 parts by weight of an aspartic ester mixture in which a first aspartic ester having an amine equivalent of 279 and a second aspartic ester having an amine equivalent of 290 are mixed in a weight ratio of 50 to 70:30 to 50; 0.1 to 1 part by weight of a dispersant; 0.1 to 1 part by weight of an antifoaming agent; 1 to 20 parts by weight of a plasticizer; and 10 to 30 parts by weight of a solvent. The composition comprises 0.1 to 1 weight part of a UV stabilizer; and 1 to 10 weight parts of a room temperature curable additive, wherein the room temperature curable additive comprises 100 weight parts of N-phenyl-p-phenylenediamine; 10 to 30 weight parts of a gum arabic-cysteine ​​polymer; 1 to 10 weight parts of zinc glycerolate; and 1 to 10 weight parts of pyrophyllite, wherein the gum arabic-cysteine ​​polymer comprises the steps of preparing a mixture by mixing dry gum arabic and cysteine ​​in a weight ratio of 1:0.1 to 0.5 and then milling at 300 to 800 rpm for 1 to 4 hours, and washing the mixture to prepare the gum arabic-cysteine ​​polymer, thereby It offers excellent adhesion to exterior concrete surfaces, masonry walls, stone or panels, Dryvit, and exposed steel surfaces. Physical properties such as compressive strength, tensile strength, tear strength, water resistance, corrosion resistance, water resistance, chemical resistance (acid and alkali resistance), abrasion resistance, heat resistance, UV resistance, and durability can be improved. It exhibits excellent storage stability as it does not settle even during long-term storage. Furthermore, these properties are maintained even under harsh conditions (light, heat, and humidity) after application, preventing peeling, delamination, and cracking caused by physical abrasion, erosion, impact, or chemical corrosion. A perfectly transparent film layer can be formed on masonry walls with just a single application using simple manual tools such as brushes, rollers, or airless sprays. The formed transparent film layer allows for the visual identification of cracks or leaks occurring in the structure, facilitating the tracking of leaks, repair, and maintenance. Additionally, as an aliphatic polyurea, it prevents yellowing and radical The present invention relates to a room-temperature curing transparent polyurea coating composition capable of achieving a beautiful appearance without structural destruction caused by attack, and an exterior wall waterproofing method using the same.

Description

Technology Field

[0001] The present invention offers excellent adhesion to external concrete surfaces, masonry walls, stone or panels, dryvit, and exposed steel surfaces; improves physical properties such as compressive strength, tensile strength, tear strength, water resistance, corrosion resistance, water resistance, chemical resistance (acid resistance, alkali resistance), abrasion resistance, heat resistance, UV resistance, and durability; provides excellent storage stability as it does not settle even during long-term storage; maintains these properties even under harsh conditions (light, heat, and humidity) after application, thereby preventing lifting, peeling, and cracking caused by physical abrasion, erosion, impact, or chemical corrosion; forms a perfect transparent film layer on masonry walls with just a single application using simple manual tools such as brushes, rollers, or airless sprays; enables visual identification of cracks or leaks occurring in the structure through the formed transparent film layer, making it advantageous for tracking leak areas, repairing defects, and managing maintenance; and, as an aliphatic polyurea, prevents yellowing and The present invention relates to a room-temperature curing transparent polyurea coating composition capable of achieving a beautiful appearance by preventing structural destruction caused by radical attacks, and an exterior wall waterproofing method using the same. Background Technology

[0003] Waterproofing is performed on architectural or civil engineering structures to resolve problems such as leakage caused by corrosion or erosion, reduced durability due to cracking, shortened lifespan of the structure itself, and increased maintenance costs.

[0004] However, poor adhesion between the exterior concrete surface, masonry walls, stone or panels, dryvit, exposed steel surfaces, and waterproofing materials leads to cracks and leakage, which not only causes concrete deterioration and steel surface corrosion but also increases the likelihood of thermal cracking due to the lack of thermal insulation against temperature changes, resulting in disadvantages such as reduced durability and increased maintenance costs.

[0005] Generally, the wall structure may consist solely of a concrete structure, or a structure may be adopted in which a wall is formed by stacking facing bricks, the interior is finished with interior plaster or interior materials after selective interior insulation, and the exterior is finished with exterior insulation or exterior plaster.

[0006] As described above, when a wall is formed using a masonry structure, the exposed bricks deteriorate or age as they harden over time, causing the adhesive mortar or caulking material filling the joints to shrink, which results in cracks or detachment.

[0007] Furthermore, components present in the cementitious agent constituting the mortar or in the infiltrating water from the outside, such as calcium hydroxide (Ca(OH)2), sodium sulfate (Na2SO4), and calcium sulfate (K2SO4), migrate from the interior of the hardener to the surface in an aqueous solution state. Subsequently, as the water evaporates, efflorescence occurs, in which efflorescence substances precipitate. This not only damages the aesthetics of the exterior wall but also presents problems such as the wall's color fading due to changes in the external environment or further deterioration of the appearance through the adsorption of other pollutants. Prior art literature

[0009] Republic of Korea Registered Patent No. 10-2721735 Republic of Korea Registered Patent No. 10-2260136 Republic of Korea Registered Patent No. 10-2134888 The problem to be solved

[0010] The present invention has been devised to solve the aforementioned problems, and one embodiment of the present invention aims to provide a room-temperature curing transparent polyurea coating composition and an exterior wall waterproofing method using the same, which has excellent adhesion to external concrete surfaces, masonry walls, stone or panels, dryvit, and exposed steel surfaces, and can stably achieve waterproofing and corrosion resistance performance even under harsh conditions (light, heat, and humidity) and long-term storage after construction.

[0011] The various problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0013] One embodiment of the present invention is a transparent polyurea coating composition in which a first agent and a second agent are mixed in a weight ratio of 1:0.5 to 1.5, wherein the first agent contains 100 parts by weight of a hexamethylene diisocyanate trimer (HDI Trimer) having an NCO content of 10 to 17 weight% and 1 to 20 parts by weight of a plasticizer, and the second agent comprises 100 parts by weight of an aspartic ester mixture in which a first aspartic ester having an amine equivalent of 279 and a second aspartic ester having an amine equivalent of 290 are mixed in a weight ratio of 50 to 70:30 to 50; 0.1 to 1 part by weight of a dispersant; 0.1 to 1 part by weight of an antifoaming agent; 1 to 20 parts by weight of a plasticizer; 10 to 30 parts by weight of a solvent; and 0.1 to 1 part by weight of a UV stabilizer. and contains 1 to 10 parts by weight of a room temperature curable additive, wherein the room temperature curable additive contains 100 parts by weight of N-phenyl-p-phenylenediamine; 10 to 30 parts by weight of gum arabic-cysteine ​​polymer; 1 to 10 parts by weight of zinc glycerolate; and 1 to 10 parts by weight of pyrophyllite,

[0014] The present invention provides a room temperature curable transparent polyurea coating composition, wherein the above gum arabic-cysteine ​​polymer is prepared by a method comprising the steps of: mixing dry gum arabic and cysteine ​​in a weight ratio of 1:0.1 to 0.5 and then milling at 300 to 800 rpm for 1 to 4 hours to prepare a mixture, and washing the mixture to prepare a gum arabic-cysteine ​​polymer.

[0015] The above pyrophyllite is

[0016] It is pyrophyllite coated with sericin;

[0017] The above sericin-coated pyrophyllite is

[0018] It may be manufactured by a method comprising the steps of: preparing a mixture by stirring 100 parts by weight of pyrophyllite and 0.1 to 10 parts by weight of sericin for 30 minutes to 3 hours; and preparing sericin-coated pyrophyllite by heat-treating the mixture at 100 to 200 ℃ for 1 to 2 hours.

[0019] The above sericin-coated pyrophyllite is

[0020] A method comprising the steps of: preparing sintered pyrophyllite by sintering pyrophyllite in an electric furnace at 500 to 700 ℃ under an argon gas atmosphere for 1 to 3 hours; preparing a mixture by stirring 100 parts by weight of sintered pyrophyllite, 0.1 to 10 parts by weight of sericin, and 0.01 to 3 parts by weight of an organic ammonium salt of tetrafluoroborate for 30 minutes to 3 hours; and preparing sericin-coated pyrophyllite by heat-treating the mixture at 100 to 200 ℃ for 1 to 2 hours, and

[0021] The organic ammonium salt of the above tetrafluoroborate may be one or more selected from the group consisting of tetraethylammonium tetrafluoroborate, tetramethylammonium tetrafluoroborate, tetrabutylammonium tetrafluoroborate, and mixtures thereof.

[0022] The above room-temperature curable additive

[0023] It may further contain 1 to 10 parts by weight of an oil mixture in which oleic triglyceride and methyl caproate are mixed in a weight ratio of 1:0.1 to 0.5 with respect to 100 parts by weight of the above N-phenyl-p-phenylenediamine.

[0024] In addition, another embodiment of the present invention is an exterior wall waterproofing method using the above-mentioned room-temperature curable transparent polyurea coating composition, wherein

[0025] The present invention provides an exterior wall waterproofing method comprising the steps of cleaning and drying the exterior surface of a structure, and the polyurea coating step of mixing and coating the room-temperature curable transparent polyurea coating composition onto the surface of the cleaned and dried structure. Effects of the invention

[0027] According to a room-temperature curing transparent polyurea coating composition and an exterior wall waterproofing method using the same according to one embodiment of the present invention, the material penetrates deeply into external concrete surfaces, masonry walls, stone or panels, dryvit, and exposed steel surfaces, resulting in excellent adhesion and improved physical properties such as compressive strength, tensile strength, tear strength, water resistance, corrosion resistance, water resistance, chemical resistance (acid resistance, alkali resistance), abrasion resistance, heat resistance, UV resistance, and durability. In addition, it has the advantage of excellent storage stability as it does not settle even during long-term storage, and the above physical properties are maintained even under harsh conditions (light, heat, and humidity) after construction, thereby preventing the occurrence of lifting, peeling, and cracking caused by physical abrasion, erosion, impact, or chemical corrosion.

[0028] In addition, according to one embodiment of the present invention, a room-temperature curing transparent polyurea coating composition and an exterior wall waterproofing method using the same can form a perfect transparent film layer on a masonry wall by applying it in a single pass with simple manual tools such as a brush, roller, or airless spray, and the formed transparent film layer allows for visual identification of cracks or leaks occurring in the structure, thereby providing the advantage of facilitating tracking of leaks, repair, and maintenance.

[0029] In addition, according to one embodiment of the present invention, the room-temperature curable transparent polyurea coating composition and the exterior wall waterproofing method using the same have the advantage of being able to achieve a beautiful appearance because yellowing and structural destruction caused by radical attack do not occur with aliphatic polyurea. Specific details for implementing the invention

[0031] Hereinafter, embodiments of the present invention will be described in detail. However, these are presented as examples and are not intended to limit the present invention, and the present invention is defined only by the scope of the claims set forth below.

[0032] One embodiment of the present invention is a transparent polyurea coating composition in which a first agent and a second agent are mixed in a weight ratio of 1:0.5 to 1.5, wherein the first agent contains 100 parts by weight of a hexamethylene diisocyanate trimer (HDI Trimer) having an NCO content of 10 to 17 weight% and 1 to 20 parts by weight of a plasticizer, and the second agent comprises 100 parts by weight of an aspartic ester mixture in which a first aspartic ester having an amine equivalent of 279 and a second aspartic ester having an amine equivalent of 290 are mixed in a weight ratio of 50 to 70:30 to 50; 0.1 to 1 part by weight of a dispersant; 0.1 to 1 part by weight of an antifoaming agent; 1 to 20 parts by weight of a plasticizer; 10 to 30 parts by weight of a solvent; and 0.1 to 1 part by weight of a UV stabilizer. and contains 1 to 10 parts by weight of a room temperature curable additive, wherein the room temperature curable additive contains 100 parts by weight of N-phenyl-p-phenylenediamine; 10 to 30 parts by weight of gum arabic-cysteine ​​polymer; 1 to 10 parts by weight of zinc glycerolate; and 1 to 10 parts by weight of pyrophyllite,

[0033] The present invention provides a room temperature curable transparent polyurea coating composition, wherein the above gum arabic-cysteine ​​polymer is prepared by a method comprising the steps of: mixing dry gum arabic and cysteine ​​in a weight ratio of 1:0.1 to 0.5 and then milling at 300 to 800 rpm for 1 to 4 hours to prepare a mixture, and washing the mixture to prepare a gum arabic-cysteine ​​polymer.

[0034] According to a room-temperature curing transparent polyurea coating composition and an exterior wall waterproofing method using the same according to one embodiment of the present invention, the material penetrates deeply into external concrete surfaces, masonry walls, stone or panels, dryvit, and exposed steel surfaces, resulting in excellent adhesion and improved physical properties such as compressive strength, tensile strength, tear strength, water resistance, corrosion resistance, water resistance, chemical resistance (acid resistance, alkali resistance), abrasion resistance, heat resistance, UV resistance, and durability. In addition, it has the advantage of excellent storage stability as it does not settle even during long-term storage, and the above physical properties are maintained even under harsh conditions (light, heat, and humidity) after construction, thereby preventing the occurrence of lifting, peeling, and cracking caused by physical abrasion, erosion, impact, or chemical corrosion. In addition, according to the room temperature curing transparent polyurea coating composition and exterior wall waterproofing method using the same according to one embodiment of the present invention, a perfect transparent film layer can be formed on a masonry wall by applying it in a single pass using simple manual tools such as a brush, roller, or airless spray, and cracks or leaks occurring in the structure can be visually identified through the formed transparent film layer, which has the advantage of facilitating the tracking of leaks and the repair and management of defects. In addition, according to the room temperature curing transparent polyurea coating composition and exterior wall waterproofing method using the same according to one embodiment of the present invention, since yellowing and structural destruction caused by radical attack do not occur with aliphatic polyurea, there is an advantage of being able to achieve a beautiful appearance.

[0035] A room-temperature curable transparent polyurea coating composition according to one embodiment of the present invention can achieve the above-mentioned effect by rapidly chain-reacting the secondary amine groups of the hexamethylene diisocyanate trimer and the aspartic ester. The first and second agents are mixed in a volume ratio of 1:0.5 to 1.5 to achieve a sufficient reaction without any unreacted residual components, thereby maximizing the effects of the present invention.

[0036] More specifically, the first agent may be used that contains 100 parts by weight of a hexamethylene diisocyanate trimer (HDI Trimer) having an NCO content of 10 to 17 weight% and 1 to 20 parts by weight of a plasticizer.

[0037] The above hexamethylene diisocyanate trimer increases the hydrophobicity of the waterproofing film material to improve water resistance and further enhances the mechanical strength of the film material. In addition, it suppresses yellowing caused by ultraviolet rays, improves chemical resistance and heat resistance, and reduces odor during application.

[0038] At this time, the NCO content may affect the strength, elongation, and adhesion of the coating film formed by the coating composition, as well as the workability of the coating, and in particular, may significantly affect the curing time required for forming a thick film. If the NCO content is less than 10 weight%, a problem of delayed curing time may occur, and if it exceeds 17 weight%, a problem of reduced mechanical properties may occur.

[0039] The above-mentioned hexamethylene diisocyanate trimer may be manufactured directly using methods commonly used in the field, or commercially available products may be used. For example, Desmodur® N 3800 with an NCO content of 11%, Desmodur® ultra 2822 with an NCO content of 12%, and AKNATE with an NCO content of 11%. TM D-750CB, AKNATE TM D-750CP, AKNATE TM AH-3075BX, AKNATE with an NCO content of 15.5% TM AH-2075EA, etc. can be used.

[0040] In addition, the hexamethylene diisocyanate trimer may be a modified hexamethylene diisocyanate trimer. The modified hexamethylene diisocyanate trimer may be manufactured directly by methods commonly used in the field, or a commercially available product may be used. For example, Bayhydur® XP 2700 with an NCO content of 10.6%, Desmodur® ultra N 3580 BA with an NCO content of 15.4%, etc. may be used.

[0041] Hereinafter, the content of other components constituting the first agent is based on 100 parts by weight of the hexamethylene diisocyanate trimer.

[0042] The aforementioned plasticizer serves to control viscosity while simultaneously reinforcing thermal stability. Additionally, it enhances the flexibility and elasticity of the coating film, thereby reducing the occurrence of cracks caused by external impacts and temperature changes.

[0043] The above plasticizer is not specifically limited to those commonly used in the field, and may be, for example, one or more selected from the group consisting of DOTP (Dioctyl terephthalate), 1,2-Cyclohexane dicarboxylic acid diisononyl ester (Hexamoll DINCH), DEGDB (diethylene glycol dibenzoate, CAS No. 120-55-8) and mixtures thereof.

[0044] Such plasticizers may be contained in a range of 1 to 20 parts by weight per 100 parts by weight of the hexamethylene diisocyanate trimer. If the content of the plasticizer is too low, there is a problem that the improvement effect described above may be insufficient, and if the content of the plasticizer is too high, there is a problem that the mechanical strength and tackiness of the coating film may be reduced.

[0045] In addition, the second agent of the present invention may be used to contain 100 parts by weight of an aspartic ester mixture in which a first aspartic ester having an amine equivalent of 279 and a second aspartic ester having an amine equivalent of 290 are mixed in a weight ratio of 50 to 70: 30 to 50; 0.1 to 1 part by weight of a dispersant; 0.1 to 1 part by weight of an antifoamer; 1 to 20 parts by weight of a plasticizer; 10 to 30 parts by weight of a solvent; 0.1 to 1 part by weight of a UV stabilizer; and 1 to 10 parts by weight of a room temperature curable additive.

[0046] The above aspartic ester mixture influences the curing speed and increases the degree of crosslinking, thereby improving mechanical properties including durability, particularly tensile strength, tear strength, and film hardness.

[0047] More specifically, the above aspartic ester mixture may be a mixture of a first aspartic ester having an amine equivalent of 279 and a second aspartic ester having an amine equivalent of 290. In this case, the first aspartic ester serves to control the pot life and improve the hardness of the coating film, and the second aspartic ester serves to control the pot life. It is preferable that the first aspartic ester and the second aspartic ester be mixed in a weight ratio of 50 to 70: 30 to 50, and if the ratio falls outside this range, there is a problem that the hardness of the coating film may decrease.

[0048] Hereinafter, the content of other components constituting the second agent is based on 100 parts by weight of the aspartic ester mixture.

[0049] The above-mentioned dispersant uniformly disperses particles to prevent sedimentation and aggregation, thereby ensuring the storage stability of the paint and the formation of a uniform film.

[0050] The above-mentioned dispersant is not specifically limited to those commonly used in the field, and for example, BYK-110, BYK-9076, BYK-161 (Shanghai King Chemical Co., Ltd.) may be used.

[0051] Such a dispersant may be contained in a range of 0.1 to 1 part by weight per 100 parts by weight of the aspartic ester mixture. If the content of the dispersant is too low, there is a problem that the improvement effect described above may be insufficient, and if the content of the dispersant is too high, there is a problem that the adhesion of the coating film may decrease and surface defects may occur.

[0052] The above-mentioned defoaming agent stabilizes bubbles generated during the reaction between the first agent and the second agent, thereby preventing the formation of pores inside or on the surface of the coating layer and maintaining the appearance quality and physical properties of the coating film.

[0053] The above-mentioned defoaming agent is not specifically limited to those commonly used in the field, and polymer solutions containing polysiloxane, such as BYK-054, BYK-535 (BYK), and EFKA-2020, may be used.

[0054] Such defoaming agents may be contained in a range of 0.1 to 1 part by weight per 100 parts by weight of the aspartic ester mixture. If the content of the defoaming agent is too low, there is a problem that the improvement effect described above may be insufficient, and if the content of the defoaming agent is too high, there is a problem that surface bonding, such as craters and crater phenomena, may occur.

[0055] The aforementioned plasticizer serves to control viscosity while simultaneously reinforcing thermal stability. Additionally, it enhances the flexibility and elasticity of the coating film, thereby reducing the occurrence of cracks caused by external impacts and temperature changes.

[0056] The above plasticizer is not specifically limited to those commonly used in the field, and may be, for example, one or more selected from the group consisting of DOTP (Dioctyl terephthalate), 1,2-Cyclohexane dicarboxylic acid diisononyl ester (Hexamoll DINCH), DEGDB (diethylene glycol dibenzoate, CAS No. 120-55-8) and mixtures thereof.

[0057] Such plasticizers may be contained in a range of 1 to 20 parts by weight per 100 parts by weight of the aspartic ester mixture. If the content of the plasticizer is too low, there is a problem that the improvement effect described above may be insufficient, and if the content of the plasticizer is too high, there is a problem that the mechanical strength and tackiness of the coating film may be reduced.

[0058] The above solvent improves dispersibility and workability and serves to control viscosity.

[0059] The above solvent is not specifically limited to those commonly used in the field, but, for example, one or more selected from the group consisting of ethylene acetate, n-butyl acetate, xylene, methyl ethyl ketone oxime (MEKO), and mixtures thereof may be used.

[0060] Such solvents may be contained in a range of 10 to 30 parts by weight per 100 parts by weight of the aspartic ester mixture. If the content of the solvent is too low, there is a problem that the improvement effect described above may be insufficient, and if the content of the solvent is too high, there is a problem that the curing speed may be delayed and the physical properties of the coating film, such as strength and durability, may be reduced.

[0061] The above-mentioned UV stabilizer inhibits the destruction of polymer chains by ultraviolet rays, thereby maintaining the color, gloss, and mechanical properties of the coating film.

[0062] The above-mentioned UV stabilizers are commonly used in the field, such as TINUVIN B97, TINUVIN 292, and ZIKA-UVS3 (BASF).

[0063] Such UV stabilizers may be contained in a range of 0.1 to 1 part by weight per 100 parts by weight of the aspartic ester mixture. If the content of the UV stabilizer is too low, there is a problem that the improvement effect described above may be insufficient, and if the content of the UV stabilizer is too high, there is a problem that an increase in viscosity and a decrease in transparency may be caused.

[0064] The above-mentioned room-temperature curing additive suppresses damage to the coating film due to changes in light and temperature, while improving adhesion strength to structures, compressive strength, tensile strength, tear strength, water resistance, corrosion resistance, water resistance, chemical resistance (acid resistance, alkali resistance), abrasion resistance, heat resistance, UV resistance, durability, etc., and plays a role in improving storage stability.

[0065] Such room temperature curable additives may be contained in a range of 0.1 to 1 part by weight per 100 parts by weight of the aspartic ester mixture. If the content of the room temperature curable additive is too low, there is a problem that the improvement effect described above may be insufficient, and if the content of the room temperature curable additive is too high, there is a problem that excessive viscosity may occur and gelation and phase separation may occur during long-term storage.

[0066] Specifically, the above room temperature curable additive may contain 100 parts by weight of N-phenyl-p-phenylenediamine; 10 to 30 parts by weight of gum arabic-cysteine ​​polymer; 1 to 10 parts by weight of zinc glycerolate; and 1 to 10 parts by weight of pyrophyllite.

[0067] The above N-phenyl-p-phenylenediamine inhibits thermal and photochemical oxidation, thereby suppressing yellowing and surface deterioration, and plays a role in maintaining the long-term durability and elasticity of the coating film.

[0068] Hereinafter, the content of other components constituting the above-mentioned room-temperature curable additive is based on 100 parts by weight of the above-mentioned N-phenyl-p-phenylenediamine.

[0069] The above gum arabic-cysteine ​​polymer improves particle dispersibility to prevent re-aggregation and enhances adhesion.

[0070] Specifically, the gum arabic-cysteine ​​polymer can be manufactured by a method comprising the steps of: mixing dry gum arabic and cysteine ​​in a weight ratio of 1:0.1 to 0.5 and then milling the mixture at 300 to 800 rpm for 1 to 4 hours to produce a mixture, and washing the mixture to produce the gum arabic-cysteine ​​polymer.

[0071] This gum arabic-cysteine ​​polymer may be contained in a range of 10 to 30 parts by weight per 100 parts by weight of the N-phenyl-p-phenylenediamine. If the content of the gum arabic-cysteine ​​polymer is too low, there is a problem that the above-mentioned improvement effect may be insufficient, and if the content of the gum arabic-cysteine ​​polymer is too high, there is a problem that viscosity may increase and moisture sensitivity may increase.

[0072] The above zinc glycerolate plays a role in improving crack resistance by controlling the crosslinking density to enhance the flexibility and elongation of the coating film, as well as improving thermal stability.

[0073] The above zinc glycerolate may be contained in a range of 1 to 10 parts by weight per 100 parts by weight of the above N-phenyl-p-phenylenediamine. If the content of the above zinc glycerolate is too low, there is a problem that the above-mentioned improvement effect may be insufficient, and if the content of the above zinc glycerolate is too high, there is a problem that viscosity increases and curing may be delayed.

[0074] The above pyrophyllite controls viscosity and increases the mechanical strength and wear resistance of the coating film.

[0075] In order to modify the hydrophobic surface of the pyrophyllite to promote uniform dispersion within the resin medium and reinforce the bonding between coating films to enhance adhesion, pyrophyllite coated with sericin may be used.

[0076] Specifically, the sericin-coated pyrophyllite can be manufactured by a method comprising the steps of: preparing a mixture by stirring 100 parts by weight of pyrophyllite and 0.1 to 10 parts by weight of sericin for 30 minutes to 3 hours; and preparing the sericin-coated pyrophyllite by heat-treating the mixture at 100 to 200 ℃ for 1 to 2 hours.

[0077] In addition, sintered pyrophyllite may be used to improve long-term durability by increasing thermal stability and mechanical strength, as well as improving acid and alkali resistance.

[0078] Specifically, the sericin-coated pyrophyllite may be manufactured by a method comprising the steps of: sintering pyrophyllite in an electric furnace at 500 to 700 ℃ under an argon gas atmosphere for 1 to 3 hours to produce sintered pyrophyllite; stirring 100 parts by weight of sintered pyrophyllite, 0.1 to 10 parts by weight of sericin, and 0.01 to 3 parts by weight of an organic ammonium salt of tetrafluoroborate for 30 minutes to 3 hours to produce a mixture; and heat-treating the mixture at 100 to 200 ℃ for 1 to 2 hours to produce sericin-coated pyrophyllite.

[0079] At this time, the organic ammonium salt of the tetrafluoroborate acts not only as a surfactant and an adhesion promoter but also plays a role in providing long-term anti-contamination function through sterilization and antibacterial effects. This organic ammonium salt of the tetrafluoroborate may be one or more selected from the group consisting of tetraethylammonium tetrafluoroborate, tetramethylammonium tetrafluoroborate, tetrabutylammonium tetrafluoroborate, and mixtures thereof.

[0080] Such pyrophyllite may be contained in a range of 1 to 10 parts by weight per 100 parts by weight of N-phenyl-p-phenylenediamine. If the content of the pyrophyllite is too low, there is a problem that the improvement effect described above may be insufficient, and if the content of the pyrophyllite is too high, there is a problem that brittleness increases and surface smoothness decreases.

[0081] In addition, the room temperature curable additive of the present invention may further contain 1 to 10 parts by weight of an oil mixture in which oleic triglyceride and methyl caproate are mixed in a weight ratio of 1:0.1 to 0.5 with respect to 100 parts by weight of N-phenyl-p-phenylenediamine.

[0082] The above oil mixture not only reduces viscosity and imparts resistance to yellowing, but also enhances the depth and water resistance of the coating film, thereby preventing cracking. Additionally, it plays a role in improving weather resistance and adhesion.

[0083] In addition, another embodiment of the present invention provides an exterior wall waterproofing method using the room temperature curable transparent polyurea coating composition, comprising the steps of cleaning and drying the outer surface of a structure and the polyurea coating step of mixing and coating the room temperature curable transparent polyurea coating composition onto the surface of the cleaned and dried structure.

[0084] In addition, the method may further include a step of applying a primer to the surface of the cleaned and dried structure to facilitate adhesion to the surface of the structure. The primer is one that is generally used in the field and is not particularly limited in type, but non-limiting examples may include at least one selected from ceramic-based modifiers, oil-based adhesives, epoxy-based thick-film modifiers, and mixtures thereof.

[0085] According to a room-temperature curing transparent polyurea coating composition and an exterior wall waterproofing method using the same according to one embodiment of the present invention, the material penetrates deeply into external concrete surfaces, masonry walls, stone or panels, dryvit, and exposed steel surfaces, resulting in excellent adhesion and improved physical properties such as compressive strength, tensile strength, tear strength, water resistance, corrosion resistance, water resistance, chemical resistance (acid resistance, alkali resistance), abrasion resistance, heat resistance, UV resistance, and durability. In addition, it has the advantage of excellent storage stability as it does not settle even during long-term storage, and the above physical properties are maintained even under harsh conditions (light, heat, and humidity) after construction, thereby preventing the occurrence of lifting, peeling, and cracking caused by physical abrasion, erosion, impact, or chemical corrosion. In addition, according to the room temperature curing transparent polyurea coating composition and exterior wall waterproofing method using the same according to one embodiment of the present invention, a perfect transparent film layer can be formed on a masonry wall by applying it in a single pass using simple manual tools such as a brush, roller, or airless spray, and cracks or leaks occurring in the structure can be visually identified through the formed transparent film layer, which has the advantage of facilitating the tracking of leaks and the repair and management of defects. In addition, according to the room temperature curing transparent polyurea coating composition and exterior wall waterproofing method using the same according to one embodiment of the present invention, since yellowing and structural destruction caused by radical attack do not occur with aliphatic polyurea, there is an advantage of being able to achieve a beautiful appearance.

[0086] Although preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications are possible by those skilled in the art within the scope of the technical concept of the present invention.

[0088] [Preparation Example 1] Sericin-coated pyrophyllite

[0089] A mixture was prepared by stirring 100 parts by weight of pyrophyllite and 1 part by weight of sericin for 1 hour. Subsequently, the mixture was heated at 120°C for 1 hour to produce sericin-coated pyrophyllite.

[0091] [Preparation Example 2] Sericin-coated pyrophyllite

[0092] Pyrophyllite was introduced into a tube electric furnace and heated to 550°C by increasing the temperature by 5°C per minute under an argon gas atmosphere. Subsequently, a sintered body sintered at 550°C for 2 hours was crushed to produce sintered pyrophyllite. Then, 100 parts by weight of the sintered pyrophyllite, 1 part by weight of sericin, and 0.1 parts by weight of tetraethylammonium tetrafluoroborate were stirred for 1 hour to prepare a mixture. Subsequently, the mixture was heated at 120°C for 1 hour to produce sericin-coated pyrophyllite.

[0094] [Preparation Example 3] Gum arabic-cysteine ​​polymer

[0095] Dry gum arabic (product of Daejeong Hwakum) and cysteine ​​were mixed in a weight ratio of 1:0.5 and milled at 500 rpm for 3 hours to prepare a mixture. Subsequently, the mixture was washed with acetone to prepare a gum arabic-cysteine ​​polymer.

[0097] [Examples and Comparative Examples]

[0098] A room-temperature curable transparent polyurea coating composition and a comparative composition were prepared by mixing under the component and content conditions as shown in Table 1 below.

[0099] Classification (Weight Ratio) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 First 1 1 1 1 1 weight part HDI Trimer 20 20 20 100 40 Modified HDI Trimer 80 80 80 - 60 Plasticizer (DOTP (Dioctyl terephthalate)) 15 15 15 15 15 2nd 1 1 1 1 1 weight part 1st aspartic ester 60 60 60 - 40 Second aspartic ester 40 40 40 100 60 Polyoxypropylene diamine - - - - 4 Dispersant (BYK-110 product) 0.2 0.2 0.2 0.2 0.2 Antifoaming agent (BYK-054 product) 0.6 0.6 0.6 0.6 0.6 Plasticizer (DEGDB(Diethylene Glycol Dibenzoate, CAS#: 120-55-8)) 8 8 8 8 8 Solvent (xylene) 25 25 25 25 25 UV stabilizer (TINUVIN B97 product) 0.2 0.2 0.2 0.2 0.2 Room temperature curing additives 4 4 4 - - weight part N-phenyl-p-phenylenediamine 100 100 100 - - gum arabic-cysteine ​​polymer 18 (Manufacturing Example 3) 18 (Manufacturing Example 3) 18 (Manufacturing Example 3) - - Zinc Glycerolate (CAS#: 16754-68-0) 7 7 7 - - Pyrophyllite 4 4 (Preparation Example 1) 4 (Preparation Example 2) - - oil mixture 2 2 - - HDI Trimer: AKNATE with an NCO content of 11% TM D-750CB Modified HDI Trimer: Bayhydur® XP 2700 with an NCO content of 10.6% First Aspartic Ester: Amine equivalent of 279, Desmophen NH-1420 Second Aspartic Ester: Amine equivalent of 290, Desmophen NH-1520 Oil Mixture: Oleic triglyceride and methyl caproate (CAS#: 106-70-7) mixed in a weight ratio of 1:0.2

[0100] In the following, experimental results comparing the characteristics of the comparative compositions prepared according to Comparative Examples 1 and 2 with the embodiments according to the present invention are presented so that the characteristics of the room-temperature curable transparent polyurea coating compositions prepared according to Examples 1 to 3 above can be more easily identified.

[0102] [Test Example]

[0103] In a separately prepared test specimen, the first agent and the second agent prepared in the above examples and comparative examples, respectively, were introduced and mixed into a dedicated spray gun, and then spray-coated at a temperature of 65°C and a spray pressure of 2,500 psi to prepare the test specimen. The coating properties of the prepared test specimen were evaluated, and the results are shown in Table 2 below.

[0104] division Test method Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Touch-dry time (sec) KS F 4922 31 30 29 51 45 Curing time (minutes) 48 47 45 65 50 Tensile strength (N / mm²) 2 ) 16 18 20 12 15 Elongation at break (%) 304 307 312 224 274 Tear performance (N / mm) 51 55 56 34 43 Tensile strength ratio (%) -20℃ 159 154 166 118 141 60℃ 60 68 68 42 51 Growth rate (%) -20℃ 106 107 109 80 91 20℃ 205 208 211 162 184 60℃ 151 154 160 116 138 Heat-stretchable properties (%) -0.16 0.09 0.06 2.5 1.02 Tensile strength ratio (%) After heat treatment 85 90 94 71 77 After alkali treatment 87 89 91 63 72 After acid treatment 81 85 87 62 70 After sodium chloride treatment 87 92 94 64 73 After accelerated exposure treatment 81 83 86 60 76 Elongation at break (%) After heat treatment 259 265 281 190 209 After alkali treatment 264 267 278 201 205 After acid treatment 260 264 271 195 207 After sodium chloride treatment 261 267 274 194 201 After accelerated exposure treatment 260 266 271 184 209 Deterioration characteristics upon extension After heat treatment No issues No issues No issues Cracks appear Cracks appear After accelerated exposure treatment No issues No issues No issues Cracks appear No issues Adhesion performance Unprocessed 1.6 1.6 1.7 1.2 1.5 After immersion in water 1.7 1.8 1.9 1.0 1.3 After alkali treatment 1.6 1.9 2.0 1.0 1.3 After acid treatment 1.6 1.8 1.8 1.1 1.4 After sodium chloride treatment 1.6 1.8 2.0 1.1 1.3 After accelerated exposure treatment 1.7 1.9 2.0 1.1 1.4 Fatigue resistance No issues No issues No issues Excitement No issues Hardness (Shore D) ASTM 2240 33 34 35 20 25 Thermal conductivity (10mm, w / m·K) KS L 9016:2010 0.101 0.096 0.093 0.194 0.135 Endurance KS F 4919 Not a pitcher Not a pitcher Not a pitcher Not a pitcher Not a pitcher Chloride ion penetration resistance (coulomb) KS F 2711 11 8 7 35 17 Chemical resistance (1) _Tensile strength change rate 50% lactic acid ASTM D 3912 (30 days of immersion) A A A D B 10% hydrofluoric acid B B B F D 20% sulfuric acid B B B D C Sodium hydroxide 50% B B B C B Ammonium hydroxide 30% A A A C B engine oil A A A B B ethanol A A A B A Chemical resistance (1) Growth rate change rate 50% lactic acid ASTM D 3912 (30 days of immersion) A A A B B 10% hydrofluoric acid B B B D C 20% sulfuric acid B B B C B Sodium hydroxide 50% B B B C B Ammonium hydroxide 30% A A A C B engine oil A A A B B ethanol A A A B B Accelerated weathering (600-hour test according to QUV method) appearance KS M ISO 4982-3 Color difference (△E) 0.15 0.12 0.10 0.52 0.36 Gloss retention rate (%) KS M ISO 4982-3KS D 8303 92 94 97 79 82 (1)Criteria for determining chemical resistance

[0105] As shown in Table 2 above, it was confirmed that the room-temperature curable transparent polyurea coating compositions prepared in Examples 1 to 3 of the present invention exhibited excellent film performance compared to the comparative compositions prepared in Comparative Examples 1 and 2.

[0106] As explained above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, all embodiments described above should be understood as illustrative and not restrictive. The scope of the present invention should be interpreted as including all modified or altered forms derived from the meaning and scope of the claims set forth below and their equivalents, rather than from the detailed description above.

Claims

Claim 1 A transparent polyurea coating composition comprising a first agent and a second agent mixed in a weight ratio of 1:0.5 to 1.5, wherein the first agent contains 100 parts by weight of a hexamethylene diisocyanate trimer (HDI Trimer) having an NCO content of 10 to 17 weight% and 1 to 20 parts by weight of a plasticizer, and the second agent comprises 100 parts by weight of an aspartic ester mixture in which a first aspartic ester having an amine equivalent of 279 and a second aspartic ester having an amine equivalent of 290 are mixed in a weight ratio of 50 to 70:30 to 50; 0.1 to 1 part by weight of a dispersant; 0.1 to 1 part by weight of an antifoaming agent; 1 to 20 parts by weight of a plasticizer; 10 to 30 parts by weight of a solvent; and 0.1 to 1 part by weight of a UV stabilizer. A room temperature curable transparent polyurea coating composition comprising 1 to 10 parts by weight of a room temperature curable additive, wherein the room temperature curable additive comprises 100 parts by weight of N-phenyl-p-phenylenediamine; 10 to 30 parts by weight of gum arabic-cysteine ​​polymer; 1 to 10 parts by weight of zinc glycerolate; and 1 to 10 parts by weight of pyrophyllite, wherein the gum arabic-cysteine ​​polymer is prepared by a method comprising the steps of: preparing a mixture by mixing dry gum arabic and cysteine ​​in a weight ratio of 1:0.1 to 0.5 and then milling at 300 to 800 rpm for 1 to 4 hours; and preparing the gum arabic-cysteine ​​polymer by washing the mixture. Claim 2 A room temperature curable transparent polyurea coating composition according to claim 1, wherein the pyrophyllite is pyrophyllite coated with sericin; and wherein the sericin-coated pyrophyllite is prepared by a method comprising the steps of: preparing a mixture by stirring 100 parts by weight of pyrophyllite and 0.1 to 10 parts by weight of sericin for 30 minutes to 3 hours; and preparing the sericin-coated pyrophyllite by heat-treating the mixture at 100 to 200 ℃ for 1 to 2 hours. Claim 3 In paragraph 2, the sericin-coated pyrophyllite comprises the steps of: preparing sintered pyrophyllite by sintering pyrophyllite in an electric furnace at 500 to 700 ℃ under an argon gas atmosphere for 1 to 3 hours; and preparing a mixture by stirring 100 parts by weight of sintered pyrophyllite, 0.1 to 10 parts by weight of sericin, and 0.01 to 3 parts by weight of an organic ammonium salt of tetrafluoroborate for 30 minutes to 3 hours. A room temperature curable transparent polyurea coating composition, characterized by being prepared by a method comprising the step of heat-treating the above mixture at 100 to 200 ℃ for 1 to 2 hours to produce a sericin-coated pyrophyllite, wherein the organic ammonium salt of the tetrafluoroborate is one or more selected from the group consisting of tetraethylammonium tetrafluoroborate, tetramethylammonium tetrafluoroborate, tetrabutylammonium tetrafluoroborate, and mixtures thereof. Claim 4 A room temperature curable transparent polyurea coating composition according to claim 1, characterized in that the room temperature curable additive further contains 1 to 10 parts by weight of an oil mixture in which oleic triglyceride and methyl caproate are mixed in a weight ratio of 1:0.1 to 0.5 with respect to 100 parts by weight of N-phenyl-p-phenylenediamine. Claim 5 An exterior wall waterproofing method using a room temperature curable transparent polyurea coating composition selected from any one of claims 1 to 4, characterized by comprising the steps of cleaning and drying the exterior surface of a structure and the polyurea coating step of mixing and coating the room temperature curable transparent polyurea coating composition onto the surface of the cleaned and dried structure.

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