Coat structure with antibacterial and antiviral properties, and formation method, surveying instrument, and medical device of the same

Abstract

To provide an antibacterial and antiviral coat structure that can be applied to a surface of a metal or resin housing, and can exhibit antibacterial and antiviral properties not only in presence of light but also under a light-shielding condition.SOLUTION: The antibacterial and antiviral coat structure comprises a base layer and an antibacterial and antiviral layer provided on the base layer. The antibacterial and antiviral layer consists of a metal oxide-based photocatalyst and a quaternary ammonium salt-based silane. The coat structure is formed by: dispersing the metal oxide-based photocatalyst in a solvent; adding the quaternary ammonium salt-based silane to a dispersion to react; and applying a liquid after a reaction on a substrate to dry. Preferably, the antibacterial and antiviral layer contains colloidal silica.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a technology for improving the antibacterial and antiviral properties of the surface of an article made of resin or metal, and in particular to a coating structure that can exhibit antibacterial and antiviral properties both under light irradiation and light blocking conditions, a method for forming the same, surveying instruments, and medical instruments. [Background technology]

[0002] In medical devices such as ophthalmology equipment, to measure the visual acuity, refractive power, intraocular pressure, etc. of a subject's eye, the subject places their face on a chin rest and presses it against a forehead rest, and the subject looks into the eyepiece while an examiner such as a doctor performs the measurement. The examiner operates the medical device such as the ophthalmology equipment by grasping a grip called a joystick or pressing a button.

[0003] As mentioned above, medical devices have parts that come into direct contact with subjects and examiners, and among the surfaces of the device housing, the gripping part that the examiner holds, the surface of the base that supports the gripping part, and the chin rest and forehead rest that come into contact with the subject's face are particularly susceptible to the adhesion of bacteria and viruses that they carry. This has led to the problem that the surface of the device housing can become contaminated with bacteria and viruses, and that infection can spread to others who touch the device.

[0004] In non-contact intraocular pressure measurement, compressed air is blown onto the subject's eye to measure the degree of deformation of the eyeball at that moment, but the blown air can cause secretions such as tears and sebum to scatter, and these secretions can enter the air blowing unit through the nozzle, causing the inside of the air blowing unit to become dirty with secretions.

[0005] Furthermore, in the field of architecture, surveying equipment such as rotating lasers used at construction sites and pipe lasers used at sewer pipe installation sites are used in harsh outdoor environments, such as sewer pipes, and there has been a problem of harmful bacteria and viruses adhering to the surveying equipment due to contamination from rainwater, soil, filth, etc.

[0006] As an antifouling coating that prevents adhesion of such dirt, bacteria, and viruses and makes it easy to remove them if they do adhere, monomolecular water- and oil-repellent coating materials are known (see, for example, Patent Documents 1 and 2).

[0007] This monomolecular water- and oil-repellent coating material contains ether bonds in the molecules of its active ingredient, which allow the long-chain molecules to orient in a specific direction to form a monomolecular film on the surface of an article. This monomolecular film containing ether bonds has a high water-repellent angle, and is known to improve the stain resistance of the water- and oil-repellent coating layer when applied to an article.

[0008] Furthermore, a technique is known in which a metal oxide photocatalyst such as titanium oxide is coated on the surface of an article to decompose bacteria and dirt (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent No. 3275402 [Patent Document 2] Patent No. 3433024 [Patent Document 3] Patent No. 3136612 Summary of the Invention [Problem to be solved by the invention]

[0010] However, with conventional monomolecular water- and oil-repellent coatings such as those shown in Patent Documents 1 and 2, although the water- and oil-repellent properties of fluorine-based functional groups prevent dirt from adhering to many substances, some components of dirt and other substances adhere and are difficult to remove despite the presence of fluorine-based functional groups.Furthermore, this technology only prevents adhesion, and does not have a sterilizing effect on bacteria that have already adhered.

[0011] In the technology described in Patent Document 3, metal oxide photocatalysts are indeed photoexcited to generate radicals, and are therefore expected to have bactericidal properties, but visible light or ultraviolet light is required for photoexcitation, and bactericidal properties cannot be obtained under light-blocking conditions.

[0012] The present invention has been made in view of the above circumstances, and aims to provide a coating structure that can exhibit antibacterial and antiviral properties under both light irradiation and light blocking conditions, a method for forming the same, and surveying instruments and medical instruments. [Means for solving the problem]

[0013]

[0014] The invention described in claim 1 that solves the above problem is an antibacterial and antiviral coating structure comprising a substrate layer and an antibacterial and antiviral layer provided on the substrate layer, the antibacterial and antiviral layer being made of a metal oxide photocatalyst, a quaternary ammonium salt silane, and silica fine particles. In a preferred embodiment, the antibacterial and antiviral layer is made by forming a network of silica fine particles on the substrate layer, and forming a layer of the quaternary ammonium salt silane and the metal oxide photocatalyst on the network.

[0015] The invention described in claim 3 is characterized in that, in the invention described in claim 1 or 2, the quaternary ammonium salt-based silane is a trialkyl(trialkoxysilylalkyl)ammonium halide represented by the following formula: (wherein n is a natural number, R1 to R6 are each alkyl groups of any carbon number, which may be the same or different, and X is a halogen.)

[0016] [ka]

[0017] The invention as set forth in claim 4 is characterized in that in the invention as set forth in claim 1 or 2, the base layer is a resin layer or a metal layer.

[0018] The invention described in claim 5 is characterized in that, in the invention described in claim 1 or 2, the silica fine particles are colloidal silica having a particle size of 10 to 300 nm.

[0019]

[0020] The method for forming an antibacterial and antiviral coating structure described in claim 1 comprises dispersing a metal oxide photocatalyst in a solvent, adding silica fine particles to the dispersion and allowing them to react, adding the silica fine particles, adding a quaternary ammonium salt silane to the reacted liquid and allowing them to react, adding the quaternary ammonium salt silane, and applying the reacted liquid to a substrate and drying it to form an antibacterial and antiviral layer.

[0021] The invention described in claim 6 is a medical device characterized in that the antibacterial and antiviral coating structure described in any one of claims 1 to 5 is provided on the surface of a housing made of resin or metal.

[0022] The invention described in claim 7 is a surveying instrument characterized in that the antibacterial and antiviral coating structure described in any one of claims 1 to 5 is provided on the surface of a housing made of resin or metal. [Effects of the Invention]

[0023] The antibacterial and antiviral coating structure of the present invention allows the metal oxide photocatalyst to exert antibacterial and antiviral effects on the coating surface under light irradiation conditions, and at the same time, the presence of the quaternary ammonium moiety in the quaternary ammonium salt silane allows the coating surface to exert antibacterial and antiviral effects under light-blocking conditions in which the metal oxide photocatalyst would normally be inactivated.

[0024] Furthermore, in an embodiment in which silica microparticles are contained in the antibacterial and antiviral coating structure, the substrate and the silica microparticles are firmly bonded together, and the silica microparticles are also firmly bonded together with the quaternary ammonium salt-based silane, improving the adhesion between the antibacterial and antiviral coating layer and suppressing deterioration of the metal oxide-based photocatalyst. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a cross-sectional view schematically showing an antibacterial and antiviral coating structure according to a first embodiment of the present invention. [Figure 2] FIG. 4 is a cross-sectional view schematically showing an antibacterial and antiviral coating structure according to a second embodiment of the present invention. [Figure 3] FIG. 1 is a cross-sectional view schematically showing a conventional photocatalyst layer. [Figure 4] FIG. 1 is a perspective view of a joystick portion of an optometric instrument embodying the present invention. [Figure 5] 1 is a side view of an optometric instrument embodying the present invention; FIG. [Figure 6] 1 is a perspective view of a laser irradiation device according to an embodiment of the present invention; [Figure 7] 1 is a perspective view of a laser irradiation device according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0026] The antibacterial and antiviral coating structure of the present invention will be described in more detail below. 1. First embodiment: (Quaternary ammonium salt-based silane + metal oxide-based photocatalyst) (1-1. Composition) Figure 1 shows an antibacterial and antiviral coating structure 1a according to a first embodiment of the present invention. Reference numeral 2 denotes a substrate made of a resin such as ABS or a metal such as die-cast aluminum. The present invention is primarily intended for application to the housings of medical devices and surveying instruments, but is not limited to these resins or metals as long as they have OH groups on their surfaces that can condense with silanol groups.

[0027] Medical equipment includes ophthalmological equipment such as visual acuity measuring devices, refractive index measuring devices, and intraocular pressure measuring devices. Surveying equipment includes pipe laser equipment for detecting whether multiple sewer pipes are arranged in a straight line, rotating laser equipment for detecting the horizontal position inside a house, GPS (Global Positioning System) units and radio wave receiving and transmitting antennas, scanners for detecting digital topographical information, spectroscopic analysis devices for detecting the growth status of agricultural crops such as rice, and UAVs (Unmanned Aerial Vehicles, also known as drones) for photographing topographical information from the air.

[0028] An antibacterial and antiviral coating layer 3a is formed on a substrate 2 that has been activated by light irradiation or etched to form nano-order microscopic irregularities on its surface as needed. This layer is composed of quaternary ammonium salt-based silanes oriented in a specific direction, and metal oxide-based photocatalysts 5, depicted as ellipses in the figure, coordinately bonded to the oxygen of the silanol groups. Furthermore, the lower silane portion of the quaternary ammonium salt-based silane in the figure is cross-linked and bonded to the substrate 2 via oxygen atoms.

[0029] The compound referred to as a quaternary ammonium salt silane in this invention is a trialkyl(trialkoxysilylalkyl)ammonium halide having the structure shown in Chemical Formula 1 above. In this invention, the alkyl groups R1 to R6, the natural number n that determines the carbon chain length, and the halogen element X in Chemical Formula 1 are not limited. However, from the viewpoints of molecular orientation (steric hindrance) in the antibacterial and antiviral coating layer and antibacterial activity, it is preferable that one of the alkyl groups bonded to the nitrogen is long and the other two are short. Furthermore, from the viewpoint of elimination of the alkoxy groups, it is preferable that the number of carbon atoms in the alkoxy group bonded to silicon is small. Specific examples include octadecyldimethyl(3-trimethoxysilylpropyl)ammonium chloride and octadecyldimethyl(3-triethoxysilylpropyl)ammonium chloride, shown in Chemical Formula 2 below.

[0030] [ka]

[0031] The metal oxide photocatalyst 5 is a known catalyst that exhibits a bactericidal effect by being excited by irradiation with ultraviolet light or visible light to generate radicals from oxygen or water, for example as shown in Fig. 3. Examples of this catalyst that can be used include titanium oxide catalysts such as anatase-type titanium oxide and rutile-type titanium oxide, zinc oxide, tin oxide, ferric oxide, dibismuth trioxide, tungsten trioxide, and strontium titanate.

[0032] (1-2. Formation process) Next, the process for forming the antibacterial and antiviral coating structure of the first embodiment will be described. A resin or metal substrate 2 is prepared, which serves as the housing for a medical device, surveying instrument, or the like. The surface of the substrate 2 may initially have irregularities such as embossing or graining, irregularities due to etching, or may be smooth. The figure shows the surface in a smooth state. The surface may also be activated by UV irradiation.

[0033] Next, the coating liquid of the first embodiment is prepared. To prepare the coating liquid, first, a photocatalyst is mixed into a solvent. Next, a quaternary ammonium salt-based silane is added, and the mixture is homogeneously mixed with the photocatalyst and reacted to obtain the coating liquid. Here, the solvent can be methanol, ethanol, isopropanol, or a mixture of these in any ratio, and the blending ratio of the quaternary ammonium salt-based silane, photocatalyst, and solvent is 1 to 10 wt% quaternary ammonium salt-based silane, 1 to 30 wt% photocatalyst, and the remainder solvent.

[0034] This dispersion is applied to the substrate 2 by a known method such as dip coating, spray coating, spin coating, or brush coating. Note that because the dispersion does not evaporate in a vacuum, application by vapor deposition is not an option. After application, a condensation reaction between the silanol moieties of the quaternary ammonium salt-based silane and the OH groups of the substrate 2 proceeds, forming an antibacterial and antiviral coating layer 3a on the substrate 2. This is followed by drying at room temperature to 100°C, resulting in the antibacterial and antiviral coating structure 1a shown in Figure 1.

[0035] (1-3. Action and Effects) According to the antibacterial and antiviral coating structure of the first embodiment, the silane moieties of the quaternary ammonium salt-based silane are crosslinked and bonded with OH groups of the substrate, and the metal oxide-based photocatalyst is coordinately bonded, thereby enabling the coating surface to exhibit antibacterial and antiviral effects under light irradiation conditions. At the same time, the quaternary ammonium moieties are oriented on the surface (upper side) of the antibacterial and antiviral coating layer 3a, and are polarized with positive charges on the nitrogen atoms and negative charges on the chlorine atoms. This allows the coating surface to exhibit antibacterial and antiviral effects under light-blocking conditions, which would normally deactivate the metal oxide-based photocatalyst.

[0036] According to the method for forming an antibacterial and antiviral coating structure of the first embodiment, a metal oxide photocatalyst reacts with a quaternary ammonium salt silane in a dispersion, an alkoxy group is eliminated from the silane portion of the quaternary ammonium salt silane to form a silanol group, and the metal oxide photocatalyst forms a coordinate bond with the oxygen of the silanol group. Subsequently, on the substrate, the silanol group and the OH group of the substrate undergo dehydration condensation, forming an antibacterial and antiviral layer on the substrate.

[0037] 2. Second embodiment: (Quaternary ammonium salt-based silane + metal oxide-based photocatalyst + silica fine particles) (2-1. Composition) FIG. 2 shows an antibacterial and antiviral coating structure 1b according to a second embodiment of the present invention. Reference numeral 2 denotes the same substrate as in the first embodiment. An antibacterial and antiviral coating layer 3b is formed on a substrate 2 that has been activated by light irradiation or etched to form nano-order microscopic irregularities on its surface as needed. In this layer, silica microparticles 6, depicted as large ellipses in the figure, form a crosslinked network via oxygen atoms on the substrate 2, and the lower silane portion of the quaternary ammonium salt-based silane in the figure is crosslinked and bonded to the silica microparticles via oxygen atoms. The quaternary ammonium salt-based silane is oriented in a specific direction, and a metal oxide-based photocatalyst 5 is coordinately bonded to the oxygen of the silanol group. The quaternary ammonium salt-based silane and metal oxide-based photocatalyst 5 are the same as those in the first embodiment.

[0038] Here, although the atomic bonding state within the ellipse is omitted, the silica fine particles 6 are formed by repeated bonding of silicon and oxygen to form a three-dimensional network, and have OH groups at the ends outside the ellipse, which undergo dehydration condensation to form a network among the silica fine particles and bond them to the substrate 2. As the silica fine particles, for example, colloidal silica having an average diameter of 10 to 300 nm is preferred.

[0039] (2-2. Formation process) Next, the process for forming the antibacterial and antiviral coating structure of the second embodiment will be described. A substrate 2 similar to that of the first embodiment is prepared. Next, the coating liquid of the second embodiment is prepared. To prepare the coating liquid, first, a photocatalyst is mixed into a solvent. Next, silica fine particles such as colloidal silica are gradually added in small amounts at room temperature, and the mixture is uniformly mixed and reacted. Next, a quaternary ammonium salt-based silane is added, and the mixture is uniformly mixed and reacted to obtain the coating liquid of the second embodiment. The blending ratios in the coating liquid of the second embodiment are 5 to 10 wt% of the quaternary ammonium salt-based silane, 10 to 25 wt% of the photocatalyst, 10 to 30 wt% of the silica fine particles, and the remainder is solvent.

[0040] This dispersion is applied to the substrate 2 by a known method. After application, a condensation reaction between the terminal silanol groups of the silica fine particles 6 and the OH groups of the substrate 2 proceeds, forming an antibacterial and antiviral coating layer 3b on the substrate 2. This is then dried at room temperature to 100°C, yielding the antibacterial and antiviral coating structure 1b shown in Figure 2.

[0041] (2-3. Action and Effects) According to the antibacterial and antiviral coating structure of the second embodiment, the substrate and the silica microparticles are firmly bonded, and the silica microparticles are also firmly bonded to the quaternary ammonium salt-based silane, improving the adhesion between the antibacterial and antiviral coating layer and the substrate and suppressing deterioration of the metal oxide-based photocatalyst.

[0042] Furthermore, according to the method for forming an antibacterial and antiviral coating structure of the second embodiment, first, the silica microparticles react with the photocatalyst in a dispersion of the silica microparticles to form a network (reaction (1)). Next, a quaternary ammonium salt-based silane is added, and the next reaction proceeds. In reaction (2), an alkoxy group is eliminated from the silane portion of the quaternary ammonium salt-based silane to form a silanol group, and a metal oxide-based photocatalyst forms a coordinate bond with the oxygen of the silanol group. In reaction (3), the silanol group of the quaternary ammonium salt-based silane and the OH group of the silica microparticle substrate undergo dehydration condensation. Next, by applying this dispersion to the substrate, the OH group on the substrate condenses with the terminal silanol group of the silica microparticles, bonding a network of silica microparticles to the substrate, forming an antibacterial and antiviral layer.

[0043] (First and second embodiments: summary and other modifications) The antibacterial and antiviral coating layer in the first embodiment of the present invention is preferably formed to a thickness of 5 to 50 μm. This is because if it is thinner than 5 μm, the antibacterial and antiviral effect is reduced and the durability of the coating is reduced. On the other hand, if it is thicker than 50 μm, cracks are more likely to occur. In the second embodiment, the thickness is 20 to 30 μm.

[0044] 3. Specific examples Specific application examples of the present invention will be described below. 4 and 5 show an optometry device 10 as a specific example of a medical device to which the antibacterial and antiviral coating structure of the present invention is applied. The optometry device 10 comprises a base 11, a joystick 12 operated by the examiner, a publicly known optometry unit main body 13 (details of the internal structure are omitted), and a chin rest 14 and a forehead rest 15 on which the examinee places their face. The antibacterial and antiviral coating structure of the present invention is suitable for use on the exterior parts of medical devices such as the joystick, base surface, chin rest, and forehead rest that people directly touch, as it can prevent infection from touching the exterior parts.

[0045] Furthermore, although not shown in the drawings, in non-contact intraocular pressure measurement, compressed air is blown onto the subject's eye, causing secretions such as tears and sebum to scatter, and the scattered secretions easily enter the air blowing unit through the nozzle and adhere as dirt, but cleaning the inside of the air blowing unit requires disassembly, which is a complicated process. However, according to the present invention, it is possible to prevent the adhesion of dirt inside the air blowing unit, which is preferable.

[0046] Furthermore, the inside of devices such as air blowing units is not coated with resin or painted like the exterior of a housing, and the metal die-cast is left exposed or is merely surface-treated with an oxide coating or the like, but the antibacterial and antiviral coating structure of the present invention can also be applied to such metal surfaces.

[0047] 6 and 7 show a laser irradiation device 20 as a specific example of a surveying instrument to which the antibacterial and antiviral coating structure of the present invention is applied. The main body 21 of the laser irradiation device 20 is cylindrical, and the main body 21 is supported by four support legs. Inside the cylindrical housing of the main body 21, a laser oscillator (not shown) is provided so as to be swingable in two directions, up and down and horizontally, and the laser oscillator is configured to irradiate a laser beam in two directions, horizontally and vertically.

[0048] A light projection window 22 covered with glass is provided on the front surface of the main body 21, and a laser beam from the laser oscillator is irradiated through the light projection window 22.

[0049] A light receiving window is provided above the light projection window 22, through which the laser beam reflected from the target is received, and also an operation signal beam for remote control is received.

[0050] The rear of the main body 21 is inclined, and the inclined surface also serves as an operation panel 23, on which various operation switches are provided.

[0051] The main body 21 has a die-cast structure, and conventionally, the surface of the die-cast structure is painted (for decoration only) to produce a final product. In contrast, in the present invention, an antibacterial and antiviral coating layer can be applied on top of the paint as described in the first and second embodiments. Alternatively, the antibacterial and antiviral coating layer can be applied directly to an unpainted die-cast structure.

[0052] The inclined surfaces other than the operation panel 23, the light projection window 22, and the front surface of the main body 21 other than the light projection window 22 are made of plastic parts, and the antibacterial and antiviral coating layer of the present invention can be applied directly without painting.

[0053] Operation panel 23 is coated with a hydrophilic antifouling coated film (for example, PET, etc.), and an antibacterial and antiviral coating layer can be applied onto the film.

[0054] An anti-reflection film (AR film) is applied to the light projection window 22 and the glass of the light projection window, and an antibacterial and antiviral coating layer may be applied on top of the anti-reflection film. [Example]

[0055] The present invention will be described in more detail below with reference to examples and comparative examples. <1. Evaluation of bactericidal activity> [Example 1] A photocatalyst (tungsten oxide) was dispersed in ethanol to a concentration of 20 wt % to prepare a photocatalyst dispersion. Subsequently, a quaternary ammonium salt-based silane (octadecyldimethyl(3-trimethoxysilylpropyl)ammonium chloride) shown in Chemical Formula 2 was added and mixed uniformly to obtain a dispersion consisting of 8 wt % of the quaternary ammonium salt-based silane, the remainder being ethanol. Glass was used as a substrate, and the dispersion was applied to its surface by painting. The resulting mixture was then dried at room temperature (25°C) for 48 hours to obtain a coated test piece for Example 1.

[0056] [Comparative Example 1] A photocatalyst (tungsten oxide) was dispersed in ethanol to a concentration of 20 wt %, and the dispersion was applied to the surface of a substrate (quartz glass) by painting. The surface was then dried at 250°C for 1 hour to obtain a coated test piece for Comparative Example 1.

[0057] Comparative Example 2 The quaternary ammonium salt-based silane shown in Chemical Formula 2 was added to ethanol to a concentration of 8 wt % and mixed uniformly. The dispersion was then applied to the surface of a substrate (glass) by painting, and dried at 100°C for 1 hour to obtain a coated test piece for Comparative Example 2.

[0058] Multiple test pieces were prepared for each of the above examples and comparative examples, and these were subjected to the following tests: one containing Escherichia coli, one containing Staphylococcus aureus, one under dark conditions, and one under fluorescent light. The test was performed by crushing the coated glass test pieces into small pieces, sprinkling them on agar plates containing the respective bacteria, and leaving them at room temperature for 24 hours. The test was performed in a dark room and labeled with a subnumber -1, while the test was performed under a 10W fluorescent light at a distance of 30 cm and a subnumber -2. The percentage reduction in the bacterial count on the agar plate immediately before the test to the bacterial count after 24 hours of standing is shown in Table 1 for each test example.

[0059] [Table 1]

[0060] Comparative Example 1, which contained only a conventional metal oxide photocatalyst, showed a 99.5% bacterial reduction rate in the presence of light, but no bacterial reduction was observed in the dark. In contrast, Example 1, which contained the quaternary ammonium salt silane of the present invention in addition to the photocatalyst, maintained the same bacterial reduction rate in the presence of light as the conventional example, and also showed a bacterial reduction rate of 88.0% for Staphylococcus aureus and 89.0% for Escherichia coli in the dark.

[0061] Furthermore, in Comparative Example 2, which does not contain a photocatalyst and contains only a quaternary ammonium silane, the effect is the same in the presence of light and in the dark. However, compared to Example 1, the effect in the dark is slightly reduced by about 1%, but the effect in the presence of light is improved by about 10%. [Industrial Applicability]

[0062] The photocatalyst in the antibacterial and antiviral coating layer not only allows for antibacterial and antiviral properties to be exhibited under light irradiation, but also allows for antibacterial and antiviral properties to be exhibited under light-shielded conditions thanks to the quaternary ammonium, enabling surveying instruments and medical devices to be provided. Furthermore, the addition of colloidal silica improves the adhesion between the substrate and the antibacterial and antiviral coating layer, allowing the coating to maintain its function for a long period of time. [Explanation of symbols]

[0063] 1a, 1b: Antibacterial and antiviral coating structure 2: Base material 3a: Antibacterial and antiviral coating layer (first embodiment) 3b: Antibacterial and antiviral coating layer (second embodiment) 4: Conventional photocatalytic layer 5: Metal oxide photocatalyst 6: Silica particles 10: Optometry equipment 11: Base 12: Joystick 13: Eye examination unit main body 14: Chin rest 15: Frame holder 20: Laser irradiation device 21: Main body 22: Floodlight 23: Operation panel

Claims

1. a substrate layer; an antibacterial and antiviral layer provided on the base material layer; Equipped with a method for forming an antibacterial and antiviral coating structure, wherein the antibacterial and antiviral layer comprises a metal oxide-based photocatalyst, a quaternary ammonium salt-based silane, and silica fine particles, Dispersing the metal oxide photocatalyst in a solvent; Add the silica fine particles, The quaternary ammonium salt-based silane is added to prepare a coating solution; A method for forming an antibacterial and antiviral coat structure, comprising applying the coating liquid to a substrate and drying the coating liquid to form an antibacterial and antiviral layer.

2. 2. The method for forming an antibacterial and antiviral coating structure according to claim 1, wherein the quaternary ammonium salt silane is a trialkyl(trialkoxysilylalkyl)ammonium halide represented by the following formula: (where n is a natural number, R １ ~R ６ are each the same or different alkyl groups having any number of carbon atoms, and X is a halogen. 【Chemistry 1】

3. 2. The method for forming an antibacterial and antiviral coating structure according to claim 1, wherein the substrate layer is a resin layer or a metal layer.

4. 2. The method for forming an antibacterial and antiviral coating structure according to claim 1, wherein the silica fine particles are colloidal silica having a particle size of 10 to 300 nm.

5. 2. The method for forming an antibacterial and antiviral coating structure according to claim 1, wherein the coating liquid has a blending ratio of 5 to 10 wt % of the quaternary ammonium salt-based silane, 10 to 25 wt % of the metal oxide-based photocatalyst, 10 to 30 wt % of the silica fine particles, and the remainder being the solvent.

6. 3. The method for forming an antibacterial and antiviral coating structure according to claim 2, wherein the quaternary ammonium salt silane is octadecyldimethyl(3-trimethoxysilylpropyl)ammonium chloride or octadecyldimethyl(3-triethoxysilylpropyl)ammonium chloride.

7. 2. The method for forming an antibacterial and antiviral coating structure according to claim 1, wherein the surface of the substrate is activated by UV irradiation before the coating liquid is applied to the substrate.

8. 2. The method for forming an antibacterial and antiviral coating structure according to claim 1, wherein the surface of the substrate is etched to form irregularities on the surface before the coating liquid is applied to the substrate.

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