Waterproofing and reinforcement method for exterior wall repainting using high-elasticity putty, anti-fungal functional binder, and high-strength water-based paint

Abstract

The present invention relates to a method for repairing and repainting aged coatings on the exterior walls of buildings. Unlike conventional methods using simple putty, binders, and water-based paints, this invention relates to an exterior wall repainting and waterproofing reinforcement method that improves durability and waterproofing performance by using high-elasticity putty, a high-performance binder with antifungal properties, and high-strength water-based paint.

Description

Technology Field

[0001] The present invention relates to a method for repairing and repainting aged coatings on the exterior walls of buildings. Unlike conventional methods using simple putty, binders, and water-based paints, this invention relates to an exterior wall repainting and waterproofing reinforcement method that improves durability and waterproofing performance by using high-elasticity putty, a high-performance binder with antifungal properties, and high-strength water-based paint. Background Technology

[0003] Generally, the repainting of the exterior walls of a building consists of a three-step process: crack repair using putty, formation of a primer layer, and paint application.

[0004] Crack repair fills cracks and voids to flatten the surface, the formation of a primer layer ensures adhesion between the existing and new coatings, and finally, paint application restores the appearance and provides waterproofing and weather resistance. However, conventional putty materials have high hardness, making them prone to recurring cracks due to building shrinkage, expansion, or structural movements; conversely, general binders lack sufficient adhesion and antifungal properties, limiting their ability to ensure long-term durability. Furthermore, standard water-based paints have low tensile strength and stain resistance, making it difficult to maintain performance over extended periods.

[0005] In addition, there is an increasing number of attempts to paint the walls of concrete structures such as apartments and buildings with colored water-based paints containing pigments for aesthetic purposes, or to repaint them with these paints due to paint deterioration. When repainting, the exterior walls are coated with colors mixed for waterproofing purposes to make the exterior look more vibrant.

[0006] However, such conventional water-based paints are prone to peeling and discoloration due to ultraviolet rays, and over time, they harden and crack, degrading their function and performance as paint. Furthermore, reduced adhesion, such as chalking of the exterior walls and film delamination, leads to the spalling and detachment of concrete, potentially causing concrete carbonation. Additionally, surfaces painted with conventional water-based paints are generally repainted every 5 to 6 years as the old film is damaged by water stains and cracks over time, and rust seeping from the concrete structure becomes visible from the outside. However, the short repainting cycle makes it difficult to maintain the aesthetics of buildings such as apartments for an extended period, and there are issues regarding increased maintenance costs.

[0007] To prevent this, re-painting surfaces with oil-based paints presents challenges in workability, poses a risk to the health of installers and building users due to odors from organic solvents generated during application, and is not environmentally friendly. Prior art literature

[0009] Korean Published Patent No. 10-2021-0007964 (Publication Date 2021.01.20) Korean Registered Patent No. 10-2424921 (Publication Date 2022.07.22) Korean Registered Patent No. 10-2324161 (Publication Date 2021.11.11) Korean Registered Patent No. 10-2353907 (Publication Date 2022.10.20) The problem to be solved

[0010] The present invention aims to improve problems such as crack recurrence, mold growth, film peeling, and reduced durability that occur during exterior wall repainting. To this end, it provides an exterior wall repainting method that achieves crack suppression and long-term repair by applying a high-elasticity putty capable of responding to the shrinkage and expansion behavior of a building, enhances adhesion and durability compared to existing methods by using a binder with anti-mold properties and high adhesion as a primer, and simultaneously secures exterior quality and waterproofing performance by applying a water-based paint with excellent stain resistance as the final finishing material. means of solving the problem

[0012] The exterior wall repainting waterproofing reinforcement method of the present invention for achieving the above objective performs a process comprising: a first step of preparing the construction surface; a second step of treating the prepared construction surface for crack repair; a third step of applying a binder to the crack-repaired surface to form a binder layer; and a fourth step of applying and curing a high-strength water-based paint on the surface of the binder layer to paint the surface to be painted. Effects of the invention

[0014] The exterior wall repainting and waterproofing reinforcement method of the present invention utilizes high-elasticity putty during crack repair to absorb the shrinkage, expansion, and micro-movements of the structure, thereby effectively preventing crack recurrence compared to general putty and ensuring the long-term stability of the exterior wall structure. Furthermore, by applying a binder of a specific composition, the bonding strength between the water-based paint and the application surface is enhanced, thereby improving the bonding strength between the existing film and the repainted film to prevent peeling. Additionally, the binder possesses antifungal properties to suppress the growth of mold and microorganisms on the repainted film, ensuring long-term stability of the film. Moreover, the water-based paint used for repainting exhibits excellent mechanical properties and stain resistance, resulting in minimal discoloration. By maintaining the exterior wall appearance for an extended period, the method achieves the effect of stably maintaining the durability and exterior quality of the building over a long duration. Specific details for implementing the invention

[0016] The present invention will be described in more detail below.

[0017] The present invention relates to a waterproof reinforcement method for exterior wall repainting using high-elasticity putty, an antifungal functional binder, and a high-strength water-based paint, comprising a process including: a first step of preparing the construction surface; a second step of repairing cracks on the prepared construction surface; a third step of applying a binder to the crack-repaired surface to form a binder layer; and a fourth step of applying and curing a high-strength water-based paint on the surface of the binder layer to paint the surface to be painted.

[0018] The construction surface of the first stage may be a wall surface of a concrete building, and surface preparation means removing foreign substances from the surface of the construction surface, and for example, the work surface can be cleaned by removing dust and contaminants from the surface through high-pressure washing.

[0020] As a process for repairing cracks on the surface prepared in step 2, the crack repair can be performed by filling the cracked areas of the concrete building with a repair material.

[0021] The above repair material may be a general repair material used in the industry, and preferably, it may be performed using a high-elasticity putty material.

[0022] The above high-elasticity putty material may comprise a urethane-modified silicone polymer resin, a water-soluble acrylic resin, a styrene-butadiene rubber resin, silicone oil, an anionic surfactant, a filler, a water resistance enhancer, an antifoaming agent, and a solvent, and preferably comprises 20 to 25 wt% of urethane-modified silicone polymer resin, 20 to 25 wt% of water-soluble acrylic resin, 5 to 10 wt% of styrene-butadiene rubber resin, 3 to 7 wt% of silicone oil, 1 to 3 wt% of anionic surfactant, 10 to 20 wt% of filler, 2 to 4 wt% of water resistance enhancer, 0.1 to 1.0 wt% of antifoaming agent, and the remainder of 100 wt% of solvent, and comprises 22.0 to 23.5 wt% of urethane-modified silicone polymer resin, 20.0 to 22.5 wt% of water-soluble acrylic resin, and styrene-butadiene rubber A mixture prepared by mixing 6.0 to 7.0 wt% resin, 4.0 to 6.0 wt% silicone oil, 1.5 to 2.2 wt% anionic surfactant, 13.0 to 17.0 wt% filler, 2.5 to 3.5 wt% water resistance enhancer, 0.1 to 0.7 wt% defoamer, and the remaining amount of solvent out of 100 wt% may be used.

[0023] The urethane-modified silicone polymer resin in the composition of the putty material is a highly elastic resin that acts as a binder together with a water-soluble acrylic resin and provides elasticity. It includes a polymer represented by the following chemical formula 1, which is prepared by reacting a urethane-based compound with an alkoxysilane. Furthermore, if the content of this is less than 20% by weight of the total weight of the putty material, the elasticity of the putty material may not be sufficient, and if it exceeds 25% by weight, the content of other components becomes relatively low, so the physical properties required for the putty material may not be satisfied.

[0024] [Chemical Formula 1]

[0025]

[0026] In Chemical Formula 1, R 1 is -OC(CH3)3, -OC6H5, -CH2OC6H5, or -CH2CH2OC6H5, preferably R 1 is -OC(CH3)3 or -OC6H5. And, R of Chemical Formula 1 2 is a C2-C5 straight-chain alkylene group or a C3-C5 branched-chain alkylene group, preferably a C2-C5 straight-chain alkylene group, and more preferably a C3 straight-chain alkylene group.

[0027] Also, R of Chemical Formula 1 3 Is and, the above R 4 is a hydrogen atom, a C1-C3 straight-chain alkyl group, -CH2OCH3, or -CH2OCH2OH, preferably a hydrogen atom, a C1-C2 straight-chain alkyl group, or -CH2OCH2OH, and more preferably a hydrogen atom or -CH2OCH2OH.

[0028] And, m of Chemical Formula 1 is an integer from 1 to 5, preferably m is an integer from 1 to 3, and more preferably m is 2 or 3.

[0029] Among the compositions of the putty material, water-soluble acrylic resin plays a role in binding the compositions within the putty material along with providing waterproofing properties, and styrene-acrylic ester copolymer may be used. Furthermore, if the water-soluble acrylic resin content is less than 20% by weight of the total weight of the putty material, the physical properties of the putty material may be poor, and if it is used in excess of 25% by weight, the amount of other compositions used is relatively reduced, so the putty material may not be able to perform its function.

[0030] The styrene-butadiene rubber resin in the composition of the putty material plays a role in preventing the putty material from being deformed by the elasticity of the putty material and external pressure. If its content is less than 5% by weight of the total weight of the putty material, the amount used is too small to ensure sufficient elasticity, and using more than 10% by weight is uneconomical.

[0031] In addition, silicone oil in the composition of the putty material provides appropriate fluidity to the putty material, so using it in a range of 3 to 7 weight percent is appropriate in terms of the spreadability of the putty material.

[0032] In addition, the anionic surfactant in the putty composition is used to increase the miscibility between the putty compositions and to ensure that the filler is evenly dispersed within the putty, and it is appropriate to use sodium dodecyl sulfate. Furthermore, if the content is less than 1% by weight of the total weight of the putty, the amount used is too small and the filler may not be evenly dispersed within the putty, and if it is used in excess of 3% by weight, the dispersibility of the filler may decrease; therefore, it is appropriate to use it within the above range.

[0033] In addition, the filler in the composition of the putty material plays a role in improving mechanical properties such as increasing the wear resistance of the putty material, and may include one or more selected from aerosolized silica, quartz powder, calcium carbonate powder, precipitated silica, and diatomite powder. Furthermore, if the content of the filler is less than 10% by weight of the total weight, the amount used is too small and the mechanical properties of the putty material may be poor, and if it is used in excess of 20% by weight, the elasticity of the putty material may decrease, so it is appropriate to use it within the above range.

[0034] In addition, the above-mentioned waterproofing enhancer in the composition of the putty material plays a role in improving the waterproofing of the putty material and increasing the spreadability of the putty material, and may include paraffin wax, and using it in an amount of about 2 to 4 weight percent is appropriate in terms of improving waterproofing while preventing a decrease in the elasticity and mechanical properties of the putty material.

[0035] In addition, among the compositions of the putty material, the above defoaming agent may be a general defoaming agent used in the industry.

[0036] In addition, water or an aqueous ethanol solution can be used as the solvent in the putty composition, and preferably, using water or an aqueous ethanol solution with a concentration of 10 to 20 volume% is advantageous in terms of the miscibility of the putty composition.

[0038] In addition, the method of repairing cracks using a two-stage high-elasticity putty can be performed as a general crack repair method applied in the industry.

[0040] Next, step 3 is a process of applying a binder to the crack-repaired surface to form a binder layer (primer layer).

[0041] The above binder may be a primer material used for applying acrylic paint, and preferably, an antifungal functional binder may be used to suppress the growth of mold in the repainted paint, thereby ensuring the long-term stability of the repainted paint.

[0042] The above antifungal functional binder comprises ethylene vinyl acetate resin, ethylene vinyl acetate chloride modified polymer resin, trialkoxysilane monomer, antifungal agent, dispersant, and solvent, preferably comprising 45 to 60 wt% of ethylene vinyl acetate resin, 10 to 15 wt% of ethylene vinyl acetate chloride modified polymer resin, 3.0 to 8.0 wt% of trialkoxysilane monomer, 1 to 5 wt% of antifungal agent, 2.0 to 4.0 wt% of dispersant, and the remainder of 100 wt% of solvent, and more preferably comprising 50 to 58 wt% of ethylene vinyl acetate resin, 12 to 13.5 wt% of ethylene vinyl acetate chloride modified polymer resin, 4.0 to 6.0 wt% of trialkoxysilane monomer, and 2.0 to 4.0 wt% of antifungal agent. It may include 3.0 to 4.0 weight% of a dispersant and the remainder of 100 weight% of a solvent.

[0043] If the content of the ethylene vinyl acetate resin in the binder composition is less than 45.0 weight%, there may be a problem with insufficient bonding strength with the substrate surface, the bonding strength with the repainting (paint), and the adhesion retention strength, and if used in excess of 60.0 weight%, there may be a problem with poor workability due to reduced spreadability of the binder.

[0044] In addition, the ethylene vinyl acetate modified polymer resin in the binder composition is an ethylene vinyl acetate graft polymer prepared by adding a reaction initiator to a mixture of 40 to 60 parts by weight of methyl methacrylate and 800 to 1,000 parts by weight of methyl ethyl ketone with a degree of chloride of 10.0 to 20.0 wt% and performing a graft reaction, and the ethylene vinyl acetate modified resin plays a role in increasing water resistance and crack resistance. In addition, if its content is less than 10 wt% of the total weight of the binder, the effect of its use may be insufficient, and if it is used in excess of 15.0 wt%, there may be a problem of reduced miscibility between components within the binder.

[0045] Among the binder compositions, the above trialkoxysilane-based monomer serves to increase adhesion with the substrate, and 3-trialkoxysilylalkyl methacrylate or trialkoxy vinylsilane may be used, preferably 3-trialkoxysilylalkyl methacrylate may be used, and more preferably, one or more selected from 3-trimethoxysilylpropyl methacrylate, 3-triethoxysilylpropyl methacrylate, 3-tripropoxysilylpropyl methacrylate, 3-trimethoxysilylbutyl methacrylate, 3-triethoxysilylbutyl methacrylate and 3-tripropoxysilylbutyl methacrylate may be included. In addition, if the content is less than 3.0 weight% of the total weight of the binder, the effect of using it may be insufficient, and if it is used in excess of 8.0 weight%, the spreadability and coating properties of the binder of the present invention may be significantly reduced, which may result in poor workability during construction.

[0046] The antifungal agent in the binder composition inhibits the growth of mold and prevents contamination by bacteria and microorganisms. If the content of the antifungal agent in the binder is less than 1% by weight of the total weight of the binder, the amount used is too small and may not have an effect of inhibiting mold growth. Even if used in excess of 5% by weight, there is no additional antifungal effect, and excessive use may actually degrade physical properties such as the adhesive strength of the binder. Therefore, it is appropriate to use it within the above range.

[0047] In addition, the above antifungal agent may be a mixture of sodium 2-biphenylate, Al2O3 powder, and tourmaline powder, preferably comprising 20 to 40 parts by weight of Al2O3 powder and 10 to 30 parts by weight of tourmaline per 100 parts by weight of sodium 2-biphenylate, and more preferably a mixture comprising 25 to 30 parts by weight of Al2O3 powder and 10 to 20 parts by weight of tourmaline powder per 100 parts by weight of sodium 2-biphenylate.

[0048] In addition, using Al2O3 powder and tourmaline powder with an average particle size of 10㎛ or less, preferably 0.1 to 1.5㎛, is advantageous for the antifungal agent to be evenly dispersed within the binder.

[0049] The above-mentioned dispersant in the binder composition may include one or more selected from unsaturated polycarboxylic acid polymer-based dispersants, unsaturated polyamine amide salt-based dispersants, and polymer block copolymer solution-based dispersants. Furthermore, if the content thereof is less than 2.0% by weight of the total weight of the binder, the effect of its use may be insufficient, and if it exceeds 4.0% by weight, it is an excessive use, which may lead to a deterioration in the physical properties of the undercoat layer; therefore, it is preferable to use it within the above range.

[0050] Also, water can be used as the solvent in the binder composition.

[0052] Next, step 4 is a repainting process, which can be performed by applying a high-strength water-based paint (water-based paint) to the surface of the binder layer.

[0053] The above high-strength water-based paint comprises a water-soluble acrylic binder resin, a film elasticity improver, a film-forming agent, a chitosan-containing compound, an antifreeze, a extender pigment, a coloring pigment, and a solvent, preferably comprising 42 to 52 wt% of a water-soluble acrylic binder resin, 3.0 to 7.0 wt% of a film elasticity improver, 6.0 to 12.0 wt% of a film-forming agent, 1.0 to 3.0 wt% of a chitosan-containing compound, 1.0 to 5.0 wt% of an antifreeze, 0.1 to 2.0 wt% of an extender pigment, 1.0 to 4.5 wt% of a coloring pigment, and the remainder of 100 wt% of a solvent, and more preferably comprising 45.0 to 52.0 wt% of a water-soluble acrylic binder resin, 3.5 to 6.0 wt% of a film elasticity improver, 6.5 to 10.0 wt% of a film-forming agent, and 1.5 to 100 wt% of a chitosan-containing compound. It may include 2.5 wt%, antifreeze 2.0 to 4.5 wt%, extender pigment 0.4 to 1.5 wt%, coloring pigment 2.2 to 4.0 wt%, and the remainder of 100 wt% of solvent.

[0054] The water-soluble acrylic binder resin in the composition of the high-strength water-based paint comprises an acrylic copolymer resin obtained by copolymerizing a mixture of a monomer including hydroxylethyl acrylate monomer, a monomer including 1-[4-(prop-2-en-1-yl)phenyl]methanamine, a chain transfer agent, a polymerization initiator, and a solvent, and may comprise 54 to 58 weight% of hydroxylethyl acrylate monomer, 12 to 16 weight% of the monomer, 2.5 to 4.5 weight% of the chain transfer agent, 0.05 to 0.3 weight% of the polymerization initiator, and the remaining amount of solvent out of the total 100 weight%.

[0055] The chain transfer agent used in the manufacture of water-soluble acrylic binder resin may include one or more selected from CPDA (4-cyano-4-(dodecylsulfanylthiocarbonyl)sulfanyl]pentanoic acid), DDMAT (S-Dodecyl-S'-(α,α'-dimethyl-α"-aceticacid)trithiocarbonate) and CPDB (2-cyano-2-propyl benzodithioate).

[0056] The polymerization initiator used in the manufacture of water-soluble acrylic binder resin is C1~C 10 It may include one or more selected from alkyllithium, sodium alkoxide, potassium alkoxide, and lithium sulfonate, and preferably may include C2 to C5 alkyllithium or lithium sulfonate.

[0057] The solvent used in the manufacture of the acrylic copolymer resin may include one or more selected from n-pentane, n-hexane, n-heptane, isooctane, cyclohexane, toluene, benzene, and xylene, and preferably may include one or more selected from n-hexane, n-heptane, and cyclohexane.

[0058] In addition, if the content of the water-soluble acrylic binder resin in the total weight percent of the high-strength water-based paint is less than 42 weight percent, the durability of the paint film may be insufficient, and if it exceeds 52 weight percent, the overall physical properties may be reduced because the content of other components is relatively low, and the viscosity of the water-based paint may be too high, resulting in poor spreadability.

[0060] In addition, among the components of the high-strength water-based paint, the film elasticity enhancer is used to impart elasticity to the paint film formed by the water-based paint and to improve the heat resistance and durability of the paint film, and may include a poly(propylene-aliphatic diene)-g-polystyrene copolymer represented by the following chemical formula 2.

[0061] [Chemical Formula 2]

[0062]

[0063] In Formula 2, A is a terminal blocking group derived from a terminal blocking agent, and preferably, the terminal blocking agent may include 2,2′-bis-oxazolin, 2,2′-methylenebis(2-oxazolin), 2,2′-ethylenebis(2-oxazolin), 2,2′-p-phenylenebis(2-oxazolin), N,N′-hexamethylenebis(2-carbamoyl-2-oxazolin), 4-ethylbenzoic acid, propanoic acid, butynonic acid, pentanoic acid, heptanoic acid, phenylglycidyl ether, or n-butylglycidyl ether. And, the R of Formula 2 1 is -CH2-, -CH2CH2-, or -CH2CH2CH2-, preferably -CH2- or -CH2CH2-, and more preferably -CH2CH2-. And, the above R of Formula 2. 2 is -CH2CH2-, -CH2CH2CH2- or -CH2CH2CH2CH2-, preferably -CH2CH2CH2- or -CH2CH2CH2CH2-, and more preferably -CH2CH2CH2-. Also, a and b of Formula 2 represent a molar ratio, and a and b are in a molar ratio of 2 to 4:1, satisfying a weight-average molecular weight of the copolymer of 10,000 to 40,000, preferably 15,000 to 25,000.

[0064] In addition, if the content of the film elasticity improver in the total weight of the high-strength water-based paint is less than 3.0 weight% and the amount used is too small, the effect of improving the elasticity of the paint film may be insufficient, and if used in excess of 7.0 weight%, the mechanical strength of the film may be lowered, so it is appropriate to use it within the above range.

[0066] In addition, among the components of the high-strength water-based paint, the film-forming agent provides waterproofing and moisture-proofing effects to the paint film and plays a role in fundamentally blocking the penetration of moisture, and Texanol (2,2,4-Trimethyl-1,3-Pentanediol-Monoisobutyrate) may be used. Furthermore, if the content of the film-forming agent within the total weight of the high-strength water-based paint is less than 6.0 weight%, the waterproofing and moisture-proofing effects on the paint film may be insufficient, and if used in excess of 12.0 weight%, the durability of the paint film may decrease; therefore, it may be used within the above range.

[0068] In addition, among the components of the high-strength water-based paint, the chitosan-containing compound further improves the adhesion and bonding properties of the paint film, increases the tensile strength of the film, prevents cracking, and reduces the transparency of the film. When the content of the chitosan-containing compound is less than 1.0 weight%, the effect of adding the chitosan-containing compound may be minimal, and when used in excess of 3.0 weight%, the adhesion properties with the existing paint film may actually deteriorate.

[0069] The chitosan-containing compound may include a compound obtained by reacting the chitosan with 2-phosphonobutane-1,2,4-tricarboxylic acid, preferably a compound obtained by reacting the chitosan and the carboxylic compound in a weight ratio of 1:0.05 to 0.10. Furthermore, it is preferable to use chitosan having a molecular weight of 50,000 to 190,000 Da.

[0071] In addition, among the components of the high-strength water-based paint, the antifreeze agent may include ethylene glycol.

[0073] In addition, among the components of the high-strength water-based paint, the extender pigment does not have coloring power or hiding power, but plays a role in improving the mechanical properties (strength, flexibility, etc.) of the paint film and lowering gloss, and the extender pigment of the present invention may use hydrous aluminum silicate, preferably having a GE brightness of 86 to 88 and an average particle size of 0.2 to 0.6 mm, more preferably 0.3 to 0.4 mm, and may include hydrous aluminum silicate.

[0075] In addition, among the components of the high-strength water-based paint, the coloring pigment may include titanium dioxide powder and cobalt oxide powder, and preferably, titanium dioxide powder and cobalt oxide powder may be included in a weight ratio of 1:1 to 1.5, more preferably in a weight ratio of 1:1.1 to 1.3. In addition, titanium dioxide powder with an average particle size of 0.3 to 0.7 μm may be used, and it is appropriate to use cobalt oxide powder with an average particle size of 0.3 to 0.7 μm.

[0076] In addition, the solvent among the components of the high-strength water-based paint may include water.

[0078] The high-strength water-based paint described above may additionally include defoaming agents, emulsifiers, surface-modifying additives, dispersants, colored pigments, UV stabilizers, antimicrobial agents, acidity regulators, etc., to the extent that the physical properties of the paint are not impaired.

[0079] In addition, for example, various components in the additive may be included within the range of 0.1 to 0.5 wt% of an antifoamer, 0.1 to 0.5 wt% of an emulsifier, 0.1 to 0.5 wt% of a surface conditioning additive, 0.5 to 1.0 wt% of a dispersant, 0.1 to 2.0 wt% of a colored pigment, 0.1 to 0.5 wt% of a UV stabilizer, 0.1 to 0.5 wt% of an antibacterial agent, and 0.1 to 0.5 wt% of an acidity regulator, based on the total weight of the paint composition, but are not limited thereto.

[0080] To explain each additive component, the above defoaming agent is a water-based silicone defoaming agent that removes bubbles within the paint during manufacturing or application, thereby improving the appearance of the film when the film dries. If the defoaming agent is not used, bubbles may form in the film, and conversely, if an excessive amount is used, the appearance of the film may be poor, such as the appearance of craters.

[0081] In addition, when an oil phase and a water phase exist in a system, an interface between the two phases is formed if they are not mixed. However, when a surfactant is added, the polar group of the surfactant dissolves in water and the non-polar group dissolves in the oil phase, thereby creating a cross-linking effect between the water and oil phases. Therefore, emulsifiers are used for this purpose, and if emulsifiers are not used, problems may arise regarding the separation of paint layers and film formation.

[0082] In addition, water-based silicone-based surface-modifying additives can be used as surface-modifying additives. These smooth the surface of the coating film during application, improve the appearance of the coating film when drying, and play a role in improving problems such as insufficient wetting, poor wettability, cratering formation, and pigment color separation during the formation of the coating film.

[0083] In addition, colored pigments are effective in realizing the color of the paint and are effective in imparting coloring and hiding power to the paint, and inorganic colored pigments and / or organic colored pigments can be used as colored pigments.

[0084] In addition, dispersants improve the dispersion of components within the paint, thereby determining the visual effect and hiding power of the paint film. They also play an important role during the manufacture, storage, and application of the paint. It is desirable to use a dispersant for organic and inorganic pigments as a wetting dispersant for water-based paints.

[0085] Furthermore, UV stabilizers prevent the discoloration of the coating film caused by contact with UV rays and air during or after drying. Since UV stabilizers are the most effective at controlling long-term discoloration and yellowing, they enable the achievement of good physical properties in terms of weather resistance to UV rays and air. Additionally, UV stabilizers are classified according to their functional basis into UV absorbers and UV blockers, and may include, but are not limited to, one or more of benzotriazol, benzophenone, triazine, and organonickel-based UV blockers and UV absorbers.

[0086] Antimicrobial agents are additives intended for antifungal, antibacterial, and insecticidal properties, and can affect the long-term physical properties of the paint after storage and film formation.

[0087] In addition, acidity regulators, such as anionic or cationic active agents within the paint, are stable within a certain acidity range and may be unstable outside of that range. Furthermore, the viscosity of the paint is affected by acidity, which has the effect of preventing the hydrolysis of the vehicle or protective colloid and the proliferation of bacteria. Acidity regulators mainly use volatile hydrochloric acid or ammonia, and bicarbonate salts and phosphates are used as buffers. In addition, water-soluble resin paints are also neutralized by carboxylic acid groups or sulfonic acid groups to make them water-soluble; neutralizing agents include ammonia and organic amines (tertiary amines, alcohol amines), and stable inherent physical properties of the paint can be obtained by using acidity regulators.

[0089] The present invention will be explained in more detail below through examples, but the following examples are not intended to limit the scope of the invention and should be interpreted as being for the purpose of aiding understanding of the invention.

[0090] [Example]

[0091] Exemplification 1-1: Preparation of high-elasticity putty material

[0092] A high-elasticity putty material was prepared by mixing 23.2 wt% of a urethane-modified silicone polymer resin, which is a polymer represented by the following chemical formula 1-1; 22.5 wt% of a styrene-acrylic ester copolymer as a water-soluble acrylic resin; 6.3 wt% of a styrene-butadiene rubber resin; 4.7 wt% of silicone oil; 1.8 wt% of sodium dodecyl sulfate as an anionic surfactant; 14.9 wt% of a filler; 3.1 wt% of paraffin wax as a water-repellent enhancer; 0.4 wt% of a silane-based defoamer; and the remaining amount of water out of 100 wt%.

[0093] [Chemical Formula 1-1]

[0094]

[0095] In Chemical Formula 1-1, R 1 is -OC(CH3)3, and R 2 is a propylene group, and R 3 Is and R 4 is -CH2OCH2OH

[0096] The above filler was used by mixing calcium carbonate powder, precipitated silica, and diatomite powder in a weight ratio of 1:1:1.

[0098] Example 1-2 and Comparative Example 1-1

[0099] A high-strength putty material was prepared using a high-elasticity putty material with the same composition as in Example 1-1 above, but with the composition having the content as shown in Table 1 below.

[0101] Experimental Example 1: Measurement of Physical Properties of Putty Material

[0102] The physical properties of the high-strength putty materials prepared in the above Examples 1-1, 1-2 and Comparative Example 1-1 were measured, and the results are shown in Table 1 below.

[0103] Adhesion strength and tensile strength were measured according to KSM 6518, and water resistance and alkali resistance were measured according to KSM 6010. Water resistance was defined as having no abnormalities after immersion in water for 24 hours, and alkali resistance was evaluated by whether there were any abnormalities on the surface after immersion in a saturated calcium hydroxide solution for 30 days.

[0104] division Example 1-1 Examples 1-2 Comparative Example 1-1 Urethane-modified silicone polymer resin 23.2 22.3 18.3 Water-soluble acrylic resin 22.5 20.5 15.5 Styrene-butadiene rubber resin 6.3 6.2 6.9 silicone oil 4.7 4.9 5.8 Anionic surfactants 1.8 1.6 2.0 Filler 14.9 15.9 17.0 Water resistance enhancer 3.1 3.5 3.5 Silane-based antifoamer 0.4 0.4 0.6 Solvent (water) The remaining amount of 100 weight% Adhesion strength (MPa) 152 142 89 Tensile strength (MPa) 163 155 127 water resistance No issues No issues No issues alkali resistance No issues No issues Swelling phenomenon occurs

[0105] Looking at the results of the putty material property measurements in Table 1 above, the putty material of Comparative Example 1-1, which used less urethane-modified silicone polymer resin and water-soluble acrylic resin than Examples 1-1 and 1-2, showed significantly lower adhesion strength and tensile strength, and had a problem with insufficient alkali resistance. In contrast, Examples 1-1 and 1-2 had excellent adhesion and mechanical properties, while also having excellent water resistance and alkali resistance.

[0107] Example 2: Preparation of an antifungal functional binder

[0108] An antifungal functional binder was prepared by mixing and stirring 55.7 wt% of ethylene vinyl acetate resin, 13.3 wt% of ethylene vinyl acetate modified polymer resin, 5.2 wt% of 3-trimethoxysilylpropyl methacrylate, 3.8 wt% of antifungal agent, 3.2 wt% of unsaturated polycarboxylic acid polymer-based dispersant, and the remainder of 100 wt% of water, and then sealed and stored.

[0109] The ethylene vinyl acetate modified polymer resin used was an ethylene vinyl acetate graft polymer prepared by adding a reaction initiator to a mixture of 48 parts by weight of methyl methacrylate and 880 parts by weight of methyl ethyl ketone to 100 parts by weight of ethylene vinyl acetate resin having a degree of chloride of 15.0 to 16.0 wt% and performing a graft reaction.

[0110] The above antifungal agent used a mixture of 27 parts by weight of Al2O3 powder and 16 parts by weight of tourmaline powder mixed with 100 parts by weight of sodium 2-biphenylate, and the Al2O3 powder and tourmaline powder had a particle size of 0.5 to 1.2 μm.

[0112] Experimental Example 2: Evaluation of Antifungal Properties

[0113] The fungal resistance of the binder prepared in Example 2 was evaluated according to ASTM D 6329.

[0114] As a result of the evaluation, the number of fungal spores was confirmed to be less than 10 CFU / sample, and the fungal resistance value was 1.0 log CFU / sample, confirming excellent fungal resistance.

[0116] Exemplification 3: Preparation of high-strength water-based paint (water-based paint)

[0117] A high-strength water-based paint was prepared by mixing and stirring 49.5 wt% of water-soluble acrylic binder resin, 4.9 wt% of film elasticity improver, 8.5 wt% of Texanol (2,2,4-Trimethyl-1,3-Pentanediol-Monoisobutyrate) as a film-forming agent, 1.8 wt% of a chitosan-containing compound, 3.3 wt% of an antifreeze (ethylene glycol), 1.3 wt% of a filler pigment, 2.7 wt% of a coloring pigment, 0.12 wt% of a water-based silicone-based defoamer, 0.22 wt% of an emulsifier, and the remainder of 100 wt% of water, and then sealed and stored.

[0118] The above water-soluble acrylic binder resin used an acrylic copolymer resin prepared by copolymerizing a mixture comprising 55.7 wt% hydroxylethyl acrylate monomer, 15.0 wt% 1-[4-(prop-2-en-1-yl)phenyl]methanamine, 3.6 wt% DDMAT (S-Dodecyl-S'-(α,α'-dimethyl-α"-aceticacid)trithiocarbonate) as a chain transfer agent, 0.14 wt% lithium sulfonate as a polymerization initiator, and the remaining amount of cyclohexane (solvent) out of a total of 100 wt%.

[0119] The above film elasticity enhancer used was a poly(propylene-aliphatic diene)-g-polystyrene copolymer represented by the following chemical formula 2-1.

[0120] [Chemical Formula 2-1]

[0121]

[0122] In Chemical Formula 2-1, A is a terminal blocker derived from 2,2′-methylenebis(2-oxazoline), and R 1 is -CH2CH2- and R 2 It is -CH2CH2CH2-, a and b are in a molar ratio of 3.5:1, and the weight-average molecular weight of the copolymer is about 22,000.

[0123] The chitosan-containing compound above was prepared by reacting chitosan with a molecular weight of 80,000 to 100,000 Da and 2-phosphonobutane-1,2,4-tricarboxylic acid in a weight ratio of 1:0.08.

[0124] The above-mentioned filler pigment is Hydrous aluminum silicate with a diameter of 0.3 to 0.4 mm was used.

[0125] The above coloring pigment was used by mixing titanium dioxide powder with a particle size of 0.3 to 0.7 μm and cobalt oxide powder with a particle size of 0.3 to 0.7 μm in a weight ratio of 1:1.2.

[0127] Examples 3-2 and Comparative Examples 3-1 to 3-3

[0128] High-strength water-based paints were prepared using the same composition as in Example 3-1 above, but Example 3-2 and Comparative Examples 3-1 to 3-3 were carried out with different compositional contents as shown in Table 2 below.

[0129] Classification (Weight%) Example 3-1 Example 3-2 Comparative Example 3-1 Comparative Example 3-2 Comparative Example 3-3 Water-soluble acrylic binder 49.5 45.8 49.5 41.2 49.5 Coating elasticity enhancer 4.9 5.9 4.9 - 4.9 Jomakje 8.5 8.5 - 8.5 8.5 Chitosan-containing compounds 1.8 2.0 1.8 1.8 - Antifreeze 3.3 3.3 3.3 3.3 3.3 Body pigment 1.3 1.3 1.3 1.3 1.3 Coloring pigment 2.7 2.7 2.7 2.7 2.7 Antifoamer 0.12 0.12 0.12 0.12 0.12 emulsifier 0.22 0.22 0.22 0.22 0.22 Solvent (water) The remaining amount of 100 weight%

[0131] Experimental Example 3 Evaluation of Film Properties of Water-based Paint

[0132] The water repellency, elongation, accelerated weathering resistance, stain resistance, and peel strength of the water-based paints prepared in Examples 3-1 to 3-2 and Comparative Examples 3-1 to 3-3 were measured, and the results are shown in Table 3 below.

[0133] (1) Water repellency

[0134] After applying the paint to the specimen and drying it at room temperature for 7 days, the water repellency was measured according to the KS M 7057 test method. A water repellency of R6 or higher was evaluated as excellent, R2 to R4 as good, and less than R2 as insufficient.

[0135] (2) Elasticity (elongation, %)

[0136] Specimens were measured according to the test method of KS F3211, and the evaluation was as follows: 150% or more: Excellent, 100–150%: Good, less than 100%: Weak.

[0137] (3) Weather resistance

[0138] Accelerated weathering resistance over time was measured according to the KS M 5000 3231 test method, and the evaluation is as follows: 500 hours: Excellent, 300–500 hours: Good, Less than 300 hours: Poor.

[0139] (4) Stain resistance

[0140] After drying the specimens for one day, they were tilted at a 45° angle and exposed outdoors for 90 days. The color difference (ΔE) between the areas where rainwater flowed and the areas where it did not was measured, and the evaluation was performed as follows: Less than 0.5%: Excellent, 0.5–0.7%: Good, 0.7% or more: Poor.

[0141] (5) Peel strength (adhesion, N / mm 2 )

[0142] Adhesion was measured using the Elcometer Adhesion Dolly Test.

[0143] division Water repellency Elasticity (%) Weather resistance Stain resistance Peel strength (N / mm 2 ) Example 3-1 Excellent (R6) Excellent (157%) Excellent (569 hours) Excellent (0.2%) 14.7 Example 3-2 Excellent (R6) Good (142%) Excellent (597 hours) Excellent (0.4%) 13.8 Comparative Example 3-1 Good (R3) Good (148%) Good (436 hours) Insufficient (1.1%) 14.2 Comparative Example 3-2 Excellent (R6) Vulnerable (96%) Good (468 hours) Good (0.7%) 11.9 Comparative Example 3-3 Good (R4) Good (129%) Good (495 hours) Good (0.5%) 12.2

[0144] Looking at the results of the physical property evaluation in Table 3 above, it was confirmed that Examples 3-1 and 3-2 had overall excellent water repellency, elasticity, weather resistance, stain resistance, and peel strength.

[0145] In contrast, Comparative Example 3-1, which did not use a film-forming agent, showed relatively poor stain resistance compared to Example 3-1, and showed relatively poor water repellency and weather resistance.

[0146] In addition, in the case of Comparative Example 3-2, which does not use a film elasticity enhancer, compared to Examples 3-1 and 3-2, the elasticity showed a tendency to decrease significantly, and the peel strength also showed a result of significantly decreasing.

[0147] In addition, Comparative Example 3-3, which did not use a chitosan-containing compound, showed a result of overall reduced physical properties compared to Examples 3-1 and 3-2.

[0149] Preparation Example 1: Exterior wall painting method for an apartment (concrete structure)

[0150] The entire apartment wall was high-pressure washed to prepare the surface.

[0151] Next, the cracked area was repaired by performing putty work with the high-elasticity putty material prepared in Example 1-1.

[0152] Next, the antifungal functional binder prepared in Example 2-1 was spray-applied to the entire apartment wall surface, which was the construction surface.

[0153] Next, after about 18 hours had passed, the exterior wall painting of the apartment (concrete structure) was completed by applying the high-strength water-based paint prepared in Example 3-1 to the spray-applied binder layer surface and performing graphic painting treatment.

[0155] Although an embodiment of the present invention has been described above, the concept of the present invention is not limited to the embodiments presented in this specification. Those skilled in the art who understand the concept of the present invention may easily propose other embodiments within the scope of the same concept by adding, changing, deleting, or adding components, and such embodiments shall also be considered to fall within the scope of the concept of the present invention.

Claims

Claim 1 Step 1: preparing the surface for construction; Step 2: repairing cracks on the prepared surface for construction; Step 3: applying a binder to the crack-repaired surface to form a binder layer; A process comprising: a fourth step of applying and curing a high-strength water-based paint on the surface of a binder layer to paint the surface to be coated; wherein the surface of the first step is a wall of a concrete building, the crack repair treatment of the second step is performed using a high-elasticity putty material, the binder of the third step includes an antifungal functional binder, and the high-elasticity putty material comprises 20-25 wt% urethane-modified silicone polymer resin, 20-25 wt% water-soluble acrylic resin, 5-10 wt% styrene-butadiene rubber resin, 3-7 wt% silicone oil, 1-3 wt% anionic surfactant, 10-20 wt% filler, 2-4 wt% water resistance enhancer, and 0.1-1 wt% defoamer.It comprises 0 wt% and the remaining amount of solvent among 100 wt%, the urethane-modified silicone polymer resin comprises a polymer represented by the following chemical formula 1, which is a reaction product obtained by reacting a urethane-based compound with an alkoxysilane, the water-soluble acrylic resin comprises a styrene-acrylic ester copolymer, the anionic surfactant comprises sodium dodecyl sulfate, the water-repellent enhancer comprises paraffin wax, the filler comprises one or more selected from aerosol silica, quartz powder, calcium carbonate powder, precipitated silica, and diatomite powder, and the antifungal functional binder comprises ethylene vinyl acetate resin, ethylene vinyl acetate chloride modified polymer resin, trialkoxysilane-based monomer, antifungal agent, dispersant, and solvent, wherein the antifungal agent comprises 20 parts of Al2O3 powder per 100 parts by weight of sodium 2-biphenylate. A waterproofing reinforcement method for exterior wall repainting utilizing high-elasticity putty, an antifungal functional binder, and a high-strength water-based paint, comprising ~40 parts by weight and 10 to 30 parts by weight of tourmaline powder, wherein the 4th stage high-strength water-based paint comprises a water-soluble acrylic binder resin, a film elasticity enhancer represented by the following chemical formula 2, a film-forming agent, a chitosan-containing compound, an antifreeze agent, a extender pigment, a coloring pigment, and a solvent, wherein the water-soluble acrylic binder resin is an acrylic copolymer resin obtained by copolymerizing a mixture comprising a hydroxylethyl acrylate monomer, a monomer including 1-[4-(prop-2-en-1-yl)phenyl]methanamine, a chain transfer agent, a polymerization initiator, and a solvent; [Chemical Formula 1]. In Chemical Formula 1, R 1 is -OC(CH3)3, -OC6H5, -CH2OC6H5 or -CH2CH2OC6H5, and R 2 is a C2–C5 straight-chain alkylene group or a C3–C5 branched-chain alkylene group, and R 3 Is is, R 4 is a hydrogen atom, a C1-C3 straight-chain alkyl group, -CH2OCH3, or -CH2OCH2OH, and m is an integer from 1 to 5, [Chemical Formula 2] In Chemical Formula 2, A is a terminal blocker derived from a terminal blocking agent, and R 1 is -CH2-, -CH2CH2- or -CH2CH2CH2-, and the above R 2 is -CH2CH2-, -CH2CH2CH2- or -CH2CH2CH2CH2-, a and b are in a molar ratio of 2 to 4:1, and a and b are numbers satisfying the weight-average molecular weight of the copolymer 10,000 to 40,000. Claim 2 delete Claim 3 A waterproof reinforcement method for exterior wall repainting utilizing a high-elasticity putty, an antifungal functional binder, and a high-strength water-based paint, wherein, in claim 1, the chitosan-containing compound comprises a compound obtained by reacting chitosan having a molecular weight of 50,000 to 190,000 Da and 2-phosphonobutane-1,2,4-tricarboxylic acid in a weight ratio of 1:0.05 to 0.

10. Claim 4 delete Claim 5 A waterproof reinforcement method for exterior wall repainting utilizing a high-elasticity putty, an antifungal functional binder, and a high-strength water-based paint, wherein, in claim 1, the antifungal agent comprises 20 to 40 parts by weight of Al2O3 powder and 10 to 30 parts by weight of tourmaline powder per 100 parts by weight of sodium 2-biphenylate. Claim 6 A waterproof reinforcement method for exterior wall repainting utilizing a high-elasticity putty, an antifungal functional binder, and a high-strength water-based paint, wherein, in claim 1, the antifungal functional binder comprises 45 to 60 weight% of ethylene vinyl acetate resin, 10 to 15 weight% of ethylene vinyl acetate modified polymer resin, 3.0 to 8.0 weight% of trialkoxysilane monomer, 1 to 5 weight% of antifungal agent, 2.0 to 4.0 weight% of dispersant, and the remainder of 100 weight% of solvent.

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