Water-based UV-blocking transparent coating composition comprising a protective colloid and a complex surfactant

Abstract

The present invention provides an aqueous UV-blocking transparent coating liquid composition having water resistance, transparency, and protection of an existing coating film, characterized by comprising 77.4 to 84.6 parts by weight of a ketine-curable acrylic emulsion polymer, 0.9 to 1.1 parts by weight of a protective colloid, 1.3 to 1.5 parts by weight of an anionic emulsifier of the metal salt polyoxyethylene alkylarisulfate or metal salt alkylalkoxylate sulfate system, 1.4 to 1.8 parts by weight of a nonionic emulsifier of the RO-(C3H6O)x-(C2H4O)yH type having an HLB of 8-16, 1.1 to 1.3 parts by weight of an organic UV-blocking absorbent, 1.1 to 1.3 parts by weight of an organic UV-blocking stabilizer, 2.8 to 8.8 parts by weight of water, and 5.9 to 8.7 parts by weight of an additive used to control the physical properties of the coating liquid.

Description

Technology Field The present invention relates to a protective coating liquid composition, and more specifically, to a composition that can be utilized in various ways, such as by coating transparent glass or plastic panels to prevent deterioration of internal contents, increasing the durability of cultural assets and murals, increasing the durability of roofing materials, and increasing the durability of solar power facilities through coating. The present invention relates to a water-based UV-blocking coating liquid composition in which an oil-based UV-blocking additive is emulsified using an emulsification reaction method, resulting in excellent transparency, very low TVOC, and being a water-based and eco-friendly product that is safe in terms of the working environment, poses no risk of fire, and prevents damage to the coated surface caused by dissolution. Background Technology Due to climate change caused by various types of air pollution, ozone layer depletion is severe, and the resulting significant increase in the ultraviolet index is causing serious deterioration of exposed facilities and internal facilities through glass windows, leading to serious problems such as property loss, frequent replacement of internal and external facilities, and loss of murals and cultural assets. Furthermore, a vicious cycle of environmental destruction and global pollution is continuing due to factors such as the increase in waste resulting from various forms of deterioration caused by ultraviolet rays and aging. Consequently, the current practice involves attaching or installing UV-blocking films or applying oil-based UV-blocking coatings. However, film application presents several drawbacks, including high costs, the use of oil-based coatings which cause additional environmental issues, and the inconvenience of requiring expert-level personnel for installation. Furthermore, oil-based coatings carry numerous issues, such as environmental damage caused by organic solvents, worker exposure to danger due to flammability, and the persistent risk of major explosions. Prior art literature

[0006] Korean Patent Publication No. 10-2003-0017218 (Published on March 3, 2003) The problem to be solved Generally, to increase the durability of objects, cultural properties, films, coatings, and roofs exposed to the outside or outdoors against ultraviolet rays, films with UV-blocking functions are attached or oil-based UV-blocking coatings are applied. However, in this case, film application treatment is expensive, and there are various problems such as the inconvenience of requiring professional-level personnel to perform the work and the use of oil-based coating liquids, which cause other environmental issues. Furthermore, oil-based coating liquids have disadvantages such as environmental destruction and worker exposure to danger. means of solving the problem Oil-based UV blocking coating materials are expensive, and there are various problems such as the use of oil-based coating liquids causing other environmental issues and the inconvenience of requiring professional-level personnel for application. Oil-based coating liquids also have problems such as environmental destruction and worker exposure to danger. Accordingly, the aqueous UV-blocking transparent coating liquid composition for solving the above problem according to the present invention comprises 77.4 to 84.6 parts by weight of a ketine-curable acrylic emulsion polymer, 0.9 to 1.1 parts by weight of a protective colloid, 1.3 to 1.5 parts by weight of an anionic emulsifier comprising a metal salt polyoxyethylenealkylaryl sulfate or a metal salt alkylalkoxylate sulfate represented by the following chemical formula 1, 1.4 to 1.8 parts by weight of a nonionic emulsifier having an HLB of 8 to 16 and represented by the following chemical formula 2, 1.1 to 1.3 parts by weight of an organic UV-blocking absorbent, 1.1 to 1.3 parts by weight of an organic UV-blocking stabilizer, 2.8 to 8.8 parts by weight of water, and 5.9 to 8.7 parts by weight of an additive for controlling the physical properties of the coating liquid. [Chemical Formula 1] RO-(C3H6O)x-(C2H4)y-SO3M The above chemical formula In 1, R is C6 to C 18 It is a linear alkyl group based on seed oil in the range, x is 0.5 to 4, y is 2 to 15, and M is a cation. [Chemical Formula 2] RO-(C3H6O)x-(C2H4O)yH In the above Chemical Formula 2, R is C1 to C 18It is a linear alkyl group based on seed oil in the range, where x is 0.5 to 3 and y is 2 to 15. In this case, R, x, and y in Chemical Formula 1 and Chemical Formula 2 are each defined independently. The composition includes an anionic emulsifier and a nonionic emulsifier together so as to stably emulsify and disperse an organic UV-blocking absorbent and an organic UV-blocking stabilizer in an aqueous medium. Accordingly, it is possible to provide an aqueous UV-blocking transparent coating liquid composition applicable to a transparent substrate or an existing coating surface, while reducing organic solvent problems, flammability problems, and damage to the coated surface associated with the use of oil-based UV-blocking coating materials. Effects of the invention Since the above-described aqueous UV-blocking transparent coating composition is formed as an aqueous composition, it can reduce working environment issues and fire hazards associated with the use of organic solvents. Furthermore, by stably emulsifying and dispersing organic UV-blocking absorbers and organic UV-blocking stabilizers using anionic and nonionic emulsifiers, it is possible to provide UV blocking functionality while maintaining the transparency of the coating film. Additionally, the above composition can be applied to surfaces such as glass, transparent plastic panels, existing coatings, murals, signboards, cultural heritage surfaces, roofing materials, and solar power facilities. As it is composed of an aqueous coating liquid, it can reduce the possibility of dissolving or damaging the coated surface. Accordingly, the above composition can contribute to preventing UV degradation of the coated surface, protecting existing coatings, and improving the durability of the coated object. Specific details for implementing the invention Hereinafter, an aqueous UV-blocking transparent coating liquid composition having water resistance, transparency, and protection of an existing coating film according to an embodiment of the present invention will be described. An aqueous UV-blocking transparent coating liquid composition having water resistance, transparency, and protection of an existing coating film according to one embodiment of the invention comprises 77.4 to 84.6 parts by weight of a ketine-curable acrylic emulsion polymer, 0.9 to 1.1 parts by weight of a protective colloid, 1.3 to 1.5 parts by weight of an anionic emulsifier, 1.4 to 1.8 parts by weight of a nonionic emulsifier, 1.1 to 1.3 parts by weight of an organic UV-blocking absorber, 1.1 to 1.3 parts by weight of an organic UV-blocking stabilizer, 2.8 to 8.8 parts by weight of water, and 5.9 to 8.7 parts by weight of an additive. The ketine-curable acrylic emulsion polymer may be formed by reacting an acrylic monomer with diacetone acrylamide. The above acrylic monomer may have a solid content specific gravity of 40% by weight or more and a glass transition temperature of -20 to 25°C, and the ketine reaction raw material may be included in an amount of 0.5% to 5.0% by weight based on the solid content. If the ketine curable acrylic emulsion polymer is included in an amount of less than 77.4 parts by weight relative to 100 parts by weight of the total composition, the hardness of the coating film may decrease, and if it is included in an amount exceeding 84.6 parts by weight, the flexibility of the coating film may decrease. Therefore, it is preferable that the ketine curable acrylic emulsion polymer be included in an amount of 77.4 to 84.6 parts by weight relative to 100 parts by weight of the total composition. The protective colloid can improve the stability of the emulsion particles and assist in maintaining a state in which the organic UV blocking absorbent and the organic UV blocking stabilizer are uniformly dispersed within the aqueous medium. If the above protective colloid is included in an amount of less than 0.9 parts by weight relative to 100 parts by weight of the total composition, the storage stability of the composition may be reduced, and if it is included in an amount exceeding 1.1 parts by weight, workability may be reduced. Therefore, it is preferable that the above protective colloid be included in an amount of 0.9 to 1.1 parts by weight relative to 100 parts by weight of the total composition.The above anionic emulsifier may include a metal salt polyoxyethylenealkylaryl sulfate or a metal salt alkylalkoxylate sulfate. The metal salt alkylalkoxylate sulfate may be represented by the following Chemical Formula 1. [Chemical Formula 1] RO-(C3H6O)x-(C2H4)y-SO3M In the above Chemical Formula 1, R is C6 to C. 18 It is a linear alkyl group based on seed oil within the range, where x is 0.5 to 4, y is 2 to 15, and M is a cation. The anionic emulsifier can serve to improve the emulsion stability of organic UV blocking absorbers and organic UV blocking stabilizers. If the anionic emulsifier is included in an amount less than 1.3 parts by weight relative to 100 parts by weight of the total composition, emulsion stability may decrease, and if it is included in an amount exceeding 1.5 parts by weight, the water resistance of the coating film may decrease. Therefore, it is preferable that the anionic emulsifier be included in an amount of 1.3 to 1.5 parts by weight relative to 100 parts by weight of the total composition. The nonionic emulsifier has an HLB of 8 to 16 and can be represented by the following Chemical Formula 2. [Chemical Formula 2] RO-(C3H6O)x-(C2H4O)yH In Chemical Formula 2 above, R is C1 to C 18It is a linear alkyl group based on seed oil within the range, where x is 0.5 to 3 and y is 2 to 15. In this case, R, x, and y in Chemical Formula 1 and Chemical Formula 2 are each defined independently. The nonionic emulsifier can be used together with an anionic emulsifier to improve the dispersibility of the organic UV-blocking component in an aqueous medium and to assist in the emulsion stability of the coating solution composition. If the nonionic emulsifier is included in an amount less than 1.4 parts by weight relative to 100 parts by weight of the total composition, emulsion stability may be reduced, and if it is included in an amount exceeding 1.8 parts by weight, the water resistance of the coating film may be reduced. Therefore, it is preferable that the nonionic emulsifier be included in an amount of 1.4 to 1.8 parts by weight relative to 100 parts by weight of the total composition. The organic UV-blocking absorber is a component intended to absorb ultraviolet rays to reduce the deterioration of the coating target or existing coating film caused by ultraviolet rays. The organic UV-blocking absorber may be used as one type or a combination of two or more types. If the above-mentioned organic UV-blocking absorbent is included in an amount of less than 1.1 parts by weight relative to 100 parts by weight of the total composition, the UV-blocking effect may be reduced, and if it is included in an amount exceeding 1.3 parts by weight, the workability of the coating solution may be reduced. Therefore, it is preferable that the above-mentioned organic UV-blocking absorbent be included in an amount of 1.1 to 1.3 parts by weight relative to 100 parts by weight of the total composition. The above-mentioned organic UV-blocking stabilizer is a component intended to suppress the deterioration of the coating film and the substrate surface caused by ultraviolet rays and to assist in the sustainability of the UV-blocking function; it may be used as one type or a combination of two or more types, and it is preferable that it be included in an amount of 1.1 to 1.3 parts by weight relative to 100 parts by weight of the total composition. The above-mentioned water is used as a medium to aqueousize the composition and may be included in an amount of 2.8 to 8.8 parts by weight relative to 100 parts by weight of the total composition. The above-mentioned additive may include glycol, an antifoaming agent, a surface modifier, and a pH adjuster. The above additive may be used to control the physical properties, workability, surface smoothness, and pH of the coating solution, and is present in an amount of 5.9 to 8 parts by weight relative to 100 parts by weight of the total composition.It may be included in an amount of 7 parts by weight. The above aqueous UV-blocking transparent coating solution composition can be prepared by the following method. First, an acrylic emulsion, an anionic emulsifier, a nonionic emulsifier, an organic UV-blocking absorber, and an organic UV-blocking stabilizer are added to a reaction vessel and heated to about 70°C. Once the addition is complete, heating is continued while stirring at about 300 rpm, and after the heating is complete, an emulsification dispersion process is performed by adding water over a period of about 30 minutes under high-speed stirring conditions of about 1500 rpm or more. An emulsification test can be performed after the above emulsification dispersion process. The emulsification test can be performed by adding about 60 g of water to a 100 mL beaker, adding about 1 g of the solution that has undergone the emulsification dispersion process, and stirring with a glass rod. At this time, if the solution is uniformly dispersed in a milky color and no aggregates or separations insoluble in water are observed, it can be determined that the emulsification and dispersion process has been properly performed. After the above emulsification test, a protective colloid can be added and high-speed stirring can be performed at approximately 1500 rpm. Subsequently, glycol, an antifoaming agent, and a surface modifier are added, and the temperature of the composition is cooled to approximately 40°C or lower, followed by filtering and packaging to produce an aqueous UV-blocking transparent coating solution composition. delete delete delete delete delete delete delete delete (Unit: parts by weight) Ingredient Name Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Minimum mixing Maximum mixing ratio note acrylic emulsion polymer 77.4 84.6 84.6 77.4 79.0 81.6 81.4 82.1 77.4 84.6 Protective colloid 1.1 0.9 0.9 1.1 0.9 1.1 1.0 0.9 0.9 1.1 Anionic emulsifier 1.5 1.5 1.4 1.4 1.5 1.3 1.5 1.4 1.3 1.5 Non-ionic emulsifier 1.6 1.5 1.6 1.7 1.5 1.6 1.4 1.8 1.4 1.8 UV blocking agent 1.2 1.1 1.2 1.2 1.1 1.1 1.3 1.2 1.1 1.3 UV blocking stabilizer 1.2 1.1 1.2 1.2 1.1 1.1 1.3 1.2 1.1 1.3 water 7.5 3.0 3.0 7.8 8.8 5.5 4.5 2.8 2.8 8.8 glycol 6.5 4.0 4.0 6.3 4.2 4.5 5.6 6.5 4.0 6.5 Antifoamer 0.4 0.5 0.5 0.5 0.4 0.5 0.4 0.5 0.4 0.5 Surface modifier 1.2 1.2 1.2 1.1 1.1 1.3 1.3 1.1 1.1 1.3 pH adjuster 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 total 100 100 100 100 100 100 100 100 As described above, physical properties such as UV blocking effect, coating properties, and blocking retention rate were confirmed through testing of the coating composition according to the examples. In another example of the present invention, a method for producing an aqueous UV-blocking transparent coating liquid composition involves adding an acrylic emulsion, an anionic emulsifier, a nonionic emulsifier, a UV absorption blocker, and a UV blocking stabilizer, raising the temperature to about 70°C, and after adding the ingredients, stirring slowly at about 300 RPM while operating a heating device to raise the temperature to about 70°C, and after the temperature rise is finished, stirring at high speed of about 1500 RPM or more while adding water over a period of about 30 minutes to perform an emulsification and dispersion process, and after the emulsification and dispersion process, an emulsion test is performed. delete Industrial applicability The water-based UV-blocking transparent coating liquid composition of the present invention, having water resistance, transparency, and protection of the existing coating film, has the following effects: first, there is no secondary contamination, environmental damage, or air pollution; second, it is safe and easy to work with; and third, it is economical, allowing the coating to be applied without burden, thus enabling its widespread industrial use. In addition, due to climate change caused by global warming, ozone layer depletion is severe, and the resulting significant increase in the ultraviolet index is causing severe deterioration of exposed facilities and internal facilities through glass windows, leading to serious problems such as property loss, frequent replacement of internal and external facilities, and loss of murals or cultural assets. When the present invention is applied to places with such problems, work can be performed economically, safely, and easily. Furthermore, as it is a water-soluble coating material with almost no UV, it has very high industrial utility value and can also perform excellent functions for the protection of cultural assets or artifacts.

Claims

Claim 1 77.4 to 84.6 parts by weight of a ketine-curable acrylic emulsion polymer; 0.9 to 1.1 parts by weight of a protective colloid; 1.3 to 1.5 parts by weight of an anionic emulsifier comprising a metal salt polyoxyethylenealkylaryl sulfate or a metal salt alkylalkoxylate sulfate represented by the following chemical formula 1; 1.4 to 1.8 parts by weight of a nonionic emulsifier represented by the following chemical formula 2 having an HLB of 8 to 16; 1.1 to 1.3 parts by weight of an organic UV blocking absorber; 1.1 to 1.3 parts by weight of an organic UV blocking stabilizer; 2.8 to 8.8 parts by weight of water; An aqueous UV-blocking transparent coating liquid composition comprising 5.9 to 8.7 parts by weight of an additive for controlling the physical properties of the coating liquid. [Chemical Formula 1] RO-(C3H6O)x-(C2H4)y-SO3M In the above Chemical Formula 1, R is C6 to C 18 It is a linear alkyl group based on seed oil in the range, x is 0.5 to 4, y is 2 to 15, and M is a cation. [Chemical Formula 2] RO-(C3H6O)x-(C2H4O)yH In the above Chemical Formula 2, R is C1 to C 18 It is a linear alkyl group based on seed oil in the range, where x is 0.5 to 3 and y is 2 to 15. In this case, R, x, and y in Formula 1 and Formula 2 are each defined independently. Claim 2 An aqueous UV-blocking transparent coating liquid composition according to claim 1, wherein the ketine-curable acrylic emulsion polymer is formed by reacting an acrylic monomer with diacetone acrylamide, the acrylic monomer has a solid content specific gravity of 40% by weight or more and a glass transition temperature of -20 to 25°C, and the ketine reaction raw material is 0.5% by weight to 5.0% by weight based on solid content. Claim 3 delete Claim 4 delete Claim 5 An aqueous UV-blocking transparent coating liquid composition according to claim 1, characterized in that the additive comprises glycol, an antifoaming agent, a surface modifier, and a pH adjuster.

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