Paint composition having antibacterial and antifungal properties

Abstract

The present invention relates to a paint composition having antibacterial and antifungal properties. More specifically, the paint composition of the present invention can exhibit enhanced water resistance and adhesive strength while having excellent antibacterial and antifungal properties by mixing of titanium dioxide and glass frit in a resin binder at an appropriate ratio. In addition, the paint composition exhibits excellent durability by inhibiting the propagation of bacteria and fungi, thereby protecting a painted surface, further improving the aesthetic appearance and the convenience of construction and maintenance, and saving energy associated with the operation of heating and dehumidification systems, leading to economic advantages. Furthermore, the paint composition can be used as an internal paint for structures, such as houses, buildings, and warehouses.

Description

Paint composition with antibacterial and antifungal properties

[0001] The present invention relates to a paint composition having antibacterial and antifungal properties.

[0002]

[0003] Just a few years ago, the COVID-19 pandemic caused global suffering and loss of life, and the possibility of another pandemic remains ever-present. Furthermore, with interest in quality of life at an all-time high, air quality in residential and work environments is emerging as a crucial indicator of well-being. In Korea, in particular, many people suffer from mold due to the summer monsoon season, with this suffering disproportionately impacting low-income communities. Bacteria and mold cause various diseases and respiratory illnesses, and significant costs are incurred for eradicating bacteria and removing mold. Furthermore, various measures are taken to prevent bacterial and mold growth, consuming fuel and electricity, which in turn contributes significantly to carbon emissions.

[0004] Accordingly, in summer, dehumidifiers are used to lower humidity, and when this is not possible, boilers are operated to heat the room. Therefore, there is a need to develop technology that can suppress bacterial growth and prevent mold growth without these measures.

[0005] Accordingly, traditional methods for suppressing mold growth have often involved insulation, which keeps the interior surface temperature of buildings below the dew point. However, even without surface condensation, high humidity facilitates the growth of mold and bacteria, making this method ineffective.

[0006]

[0007] Accordingly, the present invention is intended to solve the above problems, and the technical problem to be solved by the present invention is to provide a paint composition having excellent antibacterial and antifungal performance by mixing titanium dioxide and glass frit in an appropriate ratio in a resin binder.

[0008]

[0009] An embodiment of the present invention for achieving the above object provides a paint composition having antibacterial and antifungal performance, comprising: 40 to 50 wt% of a resin binder; 20 to 30 wt% of titanium dioxide (TiO2); 0.1 to 20 wt% of glass frits; 19 to 30 wt% of water; and 0.1 to 1 wt% of an additive.

[0010]

[0011] The paint composition of the present invention, by mixing titanium dioxide and glass frit in an appropriate ratio with a resin binder, exhibits excellent antibacterial and antifungal properties while also improving water resistance and adhesive strength. Furthermore, it exhibits excellent durability by inhibiting bacterial and mold growth, thereby protecting the painted surface, further enhancing the aesthetic appeal of the exterior and the convenience of construction and maintenance. Furthermore, it saves energy associated with heating and dehumidifier operation, thereby offering economic benefits. Furthermore, it can be utilized as an interior paint for structures such as houses, buildings, and warehouses.

[0012]

[0013] Figure 1 is an antibacterial performance report showing the results of an antibacterial test on a paint composition of Example 1 according to the present invention.

[0014] Figure 2 is an antibacterial performance report showing the results of an antibacterial test on a paint composition of Example 2 according to the present invention.

[0015] Figure 3 is an antifungal performance report showing the results of an antifungal test on the paint composition of Example 1 according to the present invention.

[0016] Figure 4 is an antifungal performance report showing the results of an antifungal test on the paint composition of Example 2 according to the present invention.

[0017]

[0018] Hereinafter, a paint composition having antibacterial and antifungal performance according to the present invention will be described in detail.

[0019] The terms and words used in this specification and claims are not to be construed as limited to their conventional or dictionary meanings. Rather, they should be construed in a way that reflects the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of a term to best describe his or her invention. Therefore, the embodiments described in this specification and the configurations depicted in the drawings are merely the most preferred embodiments of the present invention, and it should be understood that various equivalents and modifications may be substituted for them at the time of filing this application.

[0020] In one aspect, the present invention provides a paint composition having antibacterial and antifungal performance comprising 40 to 50 wt% of a resin binder; 20 to 30 wt% of titanium dioxide (TiO2); 0.1 to 20 wt% of glass frits; 19 to 30 wt% of water; and 0.1 to 1 wt% of an additive.

[0021] The above resin binder may be at least one selected from the group consisting of acrylic, alkyd, water-soluble acrylic emulsion and epoxy emulsion, and preferably may be a water-soluble acrylic emulsion.

[0022] The above water-soluble acrylic emulsion is a water-soluble polymer resin with excellent heat stability, either glossy or matte, which can be attached to a painted surface to form a coating layer and act as a binder to prevent other functional pigments and additives from falling off the surface.

[0023] In the case of the above alkyd, drying is slow, so drying time may be required.

[0024] If the above resin binder is an epoxy emulsion, a hardener may be additionally included.

[0025] The above resin binder may comprise 40 to 50 wt% of the paint composition. If the content of the resin binder is less than 40 wt%, the paint film may become excessively rigid, causing cracks to occur after application or the viscosity may increase during manufacturing, causing inconvenience in manufacturing. Conversely, if the content exceeds 50 wt%, the viscosity may be too low, preventing sufficient dispersion of pigments during paint manufacturing or causing problems such as sedimentation during storage.

[0026] The above titanium dioxide (TiO2) is an inorganic pigment that is resistant to moisture, reflects sunlight to lower the temperature of the surface to be painted, and provides coloring and hiding power to prevent the surface from being exposed. It can be selectively used within the range of 20 to 30 wt% depending on the color of the paint required. If the content of the titanium dioxide is less than 20 wt%, the hiding power is reduced, requiring the formation of a thicker film. Conversely, if the content exceeds 30 wt%, the viscosity of the paint increases, which may cause problems by hindering manufacturing and workability.

[0027] The above glass frit may be mixed to impart antibacterial and antifungal properties to the paint composition. The glass frit may be at least one selected from the group consisting of SiO2, B2O3, P2O5, Na2O, K2O, CaO, MgO, WO3, ZnO, and SnO.

[0028] The above glass frit may be in the form of a powder having an average particle size of 10 nm to 2 ㎛. If the average particle size is less than 10 nm, the viscosity of the paint may decrease, which may adversely affect adhesion and construction. Conversely, if it exceeds 2 ㎛, the dispersibility within the paint may decrease, so that antibacterial and antifungal performance may not be evenly expressed after paint construction. In addition, the viscosity of the paint may increase, which may deteriorate manufacturing and construction.

[0029] The above glass frit may be included in an amount of 0.1 to 20 wt% with respect to the paint composition. At this time, if the content of the glass frit is less than 0.1 wt%, the antibacterial and antifungal performance may be reduced, and conversely, if it exceeds 20 wt%, the viscosity of the paint may increase, which may hinder manufacturing and construction properties.

[0030] The water content can play a role in facilitating the manufacturing process of paint and maintaining appropriate viscosity during application. If the water content is less than 19 wt%, there is a risk of increased viscosity, which may hinder manufacturing and application. Conversely, if it exceeds 30 wt%, there is a risk of decreased viscosity, which may prevent proper pigment dispersion during manufacturing or cause sedimentation during storage.

[0031] The above additive may be mixed to enhance or control functionality and physical properties, and may be at least one selected from the group consisting of a dispersant, an anti-foaming agent, an anti-freezing agent, a preservative, and a thickener. The above additive may be included in an amount of 0.1 to 1 wt% with respect to the paint composition. If the content of the additive is less than 0.1 wt%, the physical properties of the paint composition may deteriorate, and conversely, if it exceeds 1 wt%, it may be difficult to control the functionality and physical properties to a desired level.

[0032] The above paint composition may further include one or more fillers selected from the group consisting of mica, calcium carbonate and talc, preferably mica.

[0033] In particular, although not explicitly described in the examples or comparative examples below, the solar reflectance and thermal emittance performances of the paint composition according to the present invention were evaluated after applying the paint inside a house under the following three different conditions.

[0034] As a result, unlike other conditions and other numerical ranges, when all of the conditions below were satisfied, the solar reflectance was 0.88, and the thermal emissivity was 0.86, confirming excellent light reflectance and heat shielding performance.

[0035] ① The above resin binder is a water-soluble acrylic emulsion, ② the glass frit is in powder form with an average particle size of 10 nm to 2 μm, and ③ the additive may be a dispersant, an anti-foaming agent, an antifreeze agent, a preservative, and a thickener.

[0036] However, if any one of the three conditions above is not met, the light reflectance decreases rapidly or the heat insulation performance deteriorates, falling short of the expected level.

[0037] As described above, the paint composition according to the present invention can exhibit excellent antibacterial and antifungal performance while improving water resistance and adhesive strength by mixing titanium dioxide and glass frit in an appropriate ratio with a resin binder. In addition, it exhibits excellent durability by inhibiting the growth of bacteria and mold, thereby protecting the painted surface, further improving the beauty of the exterior and the convenience of construction and maintenance, and has economic advantages by saving energy for heating and dehumidifier operation. In other words, it can create and maintain a comfortable interior environment of a house and protect the health of residents by preventing the growth of bacteria and mold even in a humid environment, and is economical by reducing unnecessary energy use.

[0038] Although the present invention has been described with reference to limited embodiments and drawings, it is not limited to the above-described embodiments. Those skilled in the art will appreciate that various modifications and variations are possible based on this disclosure. Therefore, the scope of the present invention should be understood solely by the scope of the claims set forth below, and all equivalent or equivalent modifications thereof are deemed to fall within the scope of the present invention.

[0039]

[0040] Example 1: Preparation of a paint composition

[0041] A paint composition was prepared by mixing 45 wt% of a water-soluble acrylic emulsion, 25 wt% of titanium dioxide (TiO2), 0.5 wt% of glass frit in powder form with an average particle diameter of 10 nm to 2 μm, 28.5 wt% of water, and 1 wt% of an additive. At this time, the additives, a dispersant (TCP-8030N), an antifoaming agent (San nopco NXZ), an antifreeze agent (ethylene glycol), a preservative (Argos M3), and a thickener (polyurethane resin), were used in a weight ratio of 1:1:1:1, respectively.

[0042]

[0043] Example 2: Preparation of a paint composition

[0044] A paint composition was prepared by mixing 45 wt% of a water-soluble acrylic emulsion, 25 wt% of titanium dioxide (TiO2), 1 wt% of glass frit in powder form with an average particle diameter of 10 nm to 2 μm, 28 wt% of water, and 1 wt% of an additive. At this time, the additives, a dispersant (TCP-8030N), an antifoaming agent (San nopco NXZ), an antifreeze agent (ethylene glycol), a preservative (Argos M3), and a thickener (polyurethane resin), were used in a weight ratio of 1:1:1:1, respectively.

[0045]

[0046] Experimental Example 1: Antibacterial Evaluation

[0047] After applying the paints of Examples 1 and 2 to the standard film (Stomacher® 400 POLY-BAG), the test bacterial solution was applied, and the bacterial count was measured after culturing at 35±1℃, 90% RH for 24 hours. If the antibacterial activity value is 2.0 log or higher, it is considered to have an antibacterial effect. The strains used were (strain 1) Staphylococcus aureus ATCC 6538P and (strain 2) Escherichia coli ATCC 8739. The results are shown in Figs. 1 and 2.

[0048] Figure 1 is an antibacterial performance report showing the results of an antibacterial test on the paint composition of Example 1.

[0049] Figure 2 is an antibacterial performance report showing the results of an antibacterial test on the paint composition of Example 2.

[0050] Referring to the above Figures 1 and 2, the paint composition of Example 1 exhibited excellent antibacterial activity with antibacterial activity values ​​of 5.4 log and 6.2 log against strains 1 and 2, and it was confirmed that the paint composition of Example 2 exhibited even better antibacterial activity with values ​​of 5.4 log and 6.3 log against strains 1 and 2.

[0051]

[0052] Experimental Example 2: Antifungal Performance Evaluation

[0053] Specimens were prepared according to ASTM G 21-15 (2021) and soaked in water for 15 days, taken out, dried for 1 day, and then painted with 60 ㎛ of the paints of Examples 1 and 2, dried for 24 hours, and tested. (Grade: 0-4 grade, 0: no growth, 1: growth less than 10%, 2: growth less than 10-30%, 3: growth less than 30-60%, 4: growth greater than 60%)

[0054] The strains used were Aspergillus niger ATCC 9642, Penicillium pinophilum ATCC 11797, Chaetomium globosum ATCC 6205, Gliocladium virens ATCC 9645, and Aureobasidium pullplans ATCC 15233. The results are shown in Figs. 3 and 4.

[0055] Figure 3 is an antifungal performance report showing the results of an antifungal test on the paint composition of Example 1.

[0056] Figure 4 is an antifungal performance report showing the results of an antifungal test on the paint composition of Example 2.

[0057] Referring to the above Figures 3 and 4, it was confirmed that the paint compositions of Examples 1 and 2 each had excellent antifungal performance, with a grade of 0.

[0058]

[0059] The paint composition according to the present invention exhibits excellent antibacterial and antifungal properties, while also improving water resistance and adhesion. Furthermore, it exhibits superior durability by inhibiting bacterial and mold growth, protecting painted surfaces and further enhancing the aesthetic appeal of the exterior and the convenience of construction and maintenance. Furthermore, it saves energy associated with heating and dehumidifier operation, offering economic benefits. It can be used as an interior paint for structures such as houses, buildings, and warehouses.

Claims

1. 40-50 wt% resin binder; Titanium dioxide (TiO2) 20-30 wt%; Glass frits 0.1 to 20 wt%; 19-30 wt% water; and A paint composition having antibacterial and antifungal properties, comprising 0.1 to 1 wt% of an additive.

2. In paragraph 1, A paint composition having antibacterial and antifungal properties, characterized in that the resin binder is at least one selected from the group consisting of acrylic, alkyd, water-soluble acrylic emulsion, and epoxy emulsion.

3. In paragraph 2, A paint composition having antibacterial and antifungal performance, characterized in that it further comprises a hardener when the resin binder is an epoxy emulsion.

4. In paragraph 1, A paint composition having antibacterial and antifungal properties, characterized in that the above glass frit is in the form of a powder having an average particle diameter of 10 nm to 2 μm.

5. In paragraph 1, A paint composition having antibacterial and antifungal properties, characterized in that the additive is at least one selected from the group consisting of a dispersant, an antifoaming agent, an antifreeze agent, a preservative, and a thickener.

6. In paragraph 1, A paint composition having antibacterial and antifungal performance, characterized in that the paint composition further comprises at least one filler selected from the group consisting of mica, calcium carbonate and talc.

7. In paragraph 1, The above resin binder is a water-soluble acrylic emulsion, The above glass frit is in powder form with an average particle size of 10 nm to 2 μm, A paint composition having antibacterial and antifungal properties, characterized in that the additives are a dispersant, an antifoaming agent, an antifreeze agent, a preservative and a thickener.

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