Coating

Abstract

To provide a coating usable as a coating for building interior materials, having performance as an aqueous coating and superior film functions of antiviral, antibacterial, deodorizing, and humidity control, while being safe with no effect on the human body.SOLUTION: The coating according to the present invention comprises an acrylic resin, water, a pigment, an additive, and a porous structure.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a coating material for architectural interiors that has excellent antiviral, antibacterial, deodorizing, and humidity-regulating properties. [Background technology]

[0002] In recent years, from a hygiene standpoint, there has been a demand for interior paints with antiviral and antibacterial properties in homes, hospitals, commercial facilities, schools, public facilities, food factories, transportation facilities, and other facilities.

[0003] For example, Patent Document 1 discloses a paint for a substrate with an antibacterial layer, which has a substrate and an antibacterial layer disposed on at least a portion of the substrate surface, in which the antibacterial layer contains an antibacterial agent containing silver and a porous carrier capable of adsorbing silver ions, on which silver may be supported. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2015 / 198890 Summary of the Invention [Problem to be solved by the invention]

[0005] The paint disclosed in Patent Document 1 has an antibacterial layer that can be maintained for both a short and long period of time, and can therefore exhibit high antibacterial and antiviral properties when used as a paint for the interior decoration of buildings such as homes and hospitals.

[0006] However, such antibacterial and antiviral agents contain metals (especially silver) as antibacterial and antiviral substances, which can cause discoloration, increase manufacturing costs, and make them difficult to safely dispose of as waste materials.Furthermore, no particular consideration is given to humidity control.

[0007] In recent years, new building materials such as vinyl wallpaper and printed plywood, which are easy to install, require short construction periods, and are inexpensive, have been widely used as interior finishing materials for the surface finish layers on interior walls and ceilings in detached houses and apartment complexes, from the perspectives of workability and economy.

[0008] However, when new building materials such as vinyl wallpaper or printed plywood are used as interior materials, harmful gases such as organic solvents like formalin, xylene, toluene, and other chemicals contained in the adhesives used in their manufacture and construction are released into the room.Since modern homes have a highly airtight structure, various harmful gases such as organic solvents and other chemicals can fill the room, causing indoor air pollution.

[0009] Indoor air pollution caused by toxic gases such as organic solvents and other chemicals from interior materials has been shown to adversely affect residents' respiratory systems and skin, and is a contributing factor to allergies, atopic dermatitis, asthma, headaches, and other conditions, resulting in social problems such as sick house syndrome and sick building syndrome. Furthermore, such interior materials generally have poor moisture absorption and release properties, so that in winter, when the outside temperature drops and indoor humidity increases due to heating, condensation forms on the walls and backs of sealed rooms, causing the growth of black mold and bacteria. Furthermore, these new building materials may produce harmful chlorine compounds and other substances when burned, which could potentially cause environmental pollution.

[0010] The object of the present invention is to provide a coating material which is an improvement over conventional technology, has the performance of a water-based coating material, has excellent coating film functions such as antiviral properties, antibacterial properties, deodorizing properties, and humidity control properties, and is safe and harmless to the human body, and can be used as a coating material for building interior materials. [Means for solving the problem]

[0011] To solve the technical problem, the present invention relates to a paint comprising an acrylic resin, water, a pigment, an additive, and a porous structure.

[0012] The coating material according to the present invention may include at least the following embodiments: The embodiments may be adopted separately or in combination with each other. (1) The porous structure is made of highly reactive hydrated lime. (2) The specific surface area of ​​the highly reactive slaked lime is 30 m 2 / g or more, pore volume 0.1 to 0.3 cm 3 / g. (3) The content of the highly reactive slaked lime is 20 to 25% by weight. (4) When applied, the antiviral activity value is 4.0 or higher in the antiviral test in accordance with ISO 21702:2019. (5) When coated, the antibacterial activity value is 6.0 or higher in the antibacterial test in accordance with JIS Z 2801:2010. (6) When coated, the moisture absorption / desorption amount is 30 g / m2 in the moisture absorption / desorption test according to JIS A 6909 2 That's all. (7) When applied, the deodorizing test conducted in accordance with the gas chromatography method shows that the gas concentration is reduced by 99% after two hours. [Effects of the Invention]

[0013] The coating material according to the present invention has a natural appearance similar to that of a plaster wall, and has excellent coating film functions such as antiviral, antibacterial, deodorizing, and humidity-regulating properties. It can also be used as a coating material for architectural interior materials that is safe and has no effect on the human body.

[0014] The paint according to the present invention will be described in detail below. The following embodiments include not only essential features of the present invention, but also features that can be selectively adopted and features that can be combined as appropriate.

[0015] The paint according to the present invention is an aqueous paint composition containing 5-10% by weight of acrylic resin (acrylic emulsion resin), 30-35% by weight of water, 30-35% by weight of pigment, 5-10% by weight of additive, and 20-25% by weight of porous structure (highly reactive hydrated lime). There are no particular restrictions on the order in which the components are mixed.

[0016] <Acrylic resin> Acrylic resins (acrylic emulsion resins) are used to improve the adhesion of coatings to substrates while also forming soft coatings. For example, by ensuring that the average particle size of the polymer is 0.3 to 2.0 μm or greater, a polymer layer is not formed on the surface of the coating when the coating is formed, allowing for the deodorizing and moisture-absorbing properties unique to slaked lime to be exhibited. The average particle size can be determined by dynamic light scattering, laser diffraction scattering, etc.

[0017] The acrylic component of the acrylic resin may be a copolymer of a (meth)acrylic acid ester and another monomer copolymerizable therewith. Examples of the (meth)acrylic acid ester include acrylic acid esters such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, amyl acrylate, hexyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, dodecyl acrylate, octadecyl acrylate, phenyl acrylate, and benzyl acrylate, and methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, amyl methacrylate, hexyl methacrylate, octyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, dodecyl methacrylate, octadecyl methacrylate, phenyl methacrylate, and benzyl methacrylate.

[0018] <Water> Examples of water that can be used as the aqueous medium constituting the paint include tap water, ion-exchanged water, purified water, and pure water.

[0019] <Pigments> Examples of pigments (color pigments) include organic color pigments such as azo chelate pigments, insoluble azo pigments, condensed azo pigments, diketopyrrolopyrrole pigments, benzimidazolone pigments, phthalocyanine pigments, indigo pigments, perinone pigments, perylene pigments, dioxane pigments, quinacridone pigments, isoindolinone pigments, and metal complex pigments; and inorganic color pigments such as yellow lead, yellow iron oxide, red iron oxide, carbon black, and titanium dioxide. These may be used alone or in combination of two or more.

[0020] <Additives> Examples of additives that can be used to compose the paint include thickeners, antifoaming agents, and dispersants.

[0021] The thickener prevents dripping during application, and includes, but is not limited to, cellulose derivatives and water-soluble natural polymers.

[0022] Examples of the cellulose derivatives include water-soluble cellulose derivatives such as methyl cellulose, carboxymethyl cellulose, methylhydroxypropyl cellulose, hydroxyethyl cellulose, hydroxyethylmethyl cellulose, hydroxypropyl cellulose, and cellulose sulfate.

[0023] Examples of water-soluble natural polymers include proteins such as pectin, casein, gelatin, and albumin; resin polysaccharides such as gum arabic, torrant gum, and karaya gum; seed polysaccharides such as tamarind gum, guar gum, tara gum, and locust bean gum; seaweed polysaccharides such as alginate, alginic acid propyl glycol ester, carrageenan, furcellanus, and agar; plant polysaccharides such as high methoxy pectin and low methoxy pectin; starches such as raw starch, dextrin British gum, oxidized starch, and etherified or esterified starch; microbial polysaccharides such as wellam gum, xanthan gum, pullulan, and glucan; amino acid polysaccharides such as chitin and chitosan; and mucopolysaccharides such as chondroitin sulfate and hyaluronic acid.

[0024] Examples of the antifoaming agent include known antifoaming agents such as synthetic substances such as silicone-based, alcohol-based and polyether-based agents, mineral oil-based agents derived from petroleum refining, and natural mineral oil-based agents derived from plants.

[0025] Examples of dispersants include polycarboxylates, melamine-formaldehyde condensate sulfonates, lignin sulfonates, β-naphthalenesulfonic acid aldehyde condensates, polyalkylarylsulfonates, alkylnaphthalenesulfonate-formaldehyde condensate salts, etc. These may be used alone or in combination of two or more.

[0026] In addition to the above, additives for the coating material may include surface conditioners, antioxidants, plasticizers, rust inhibitors, antibacterial agents, antiviral agents, viscosity modifiers, fillers, charge control agents, stress relaxation agents, penetrating agents, ultraviolet absorbers, radical scavengers, and the like, which may be used singly or in combination of two or more.

[0027] <Porous structure> The porous structure has a plurality of pores and a required pore volume and specific surface area. Highly reactive slaked lime is preferably used in the present invention. Slaked lime, also known as calcium hydroxide, hardens by absorbing carbon dioxide from the air. After hardening, it effectively prevents condensation on walls by absorbing and releasing moisture from the indoor air, and also has heat insulation and sound absorption properties. Furthermore, its weak alkaline component also inhibits mold growth. It also has superior durability compared to new building materials such as vinyl wallpaper.

[0028] Slaked lime is made by calcining inorganic limestone or shells, but either limestone or shells can be used. It is generally said that slaked lime made from shells shrinks less when dried and hardened than regular slaked lime.

[0029] The larger the specific surface area (BET) and pore volume of slaked lime, the more reactive it is with acidic gases. Therefore, highly reactive slaked lime has a larger specific surface area (BET) and pore volume than ordinary slaked lime, as its specific surface area is increased by increasing its pore volume.

[0030] Specifically, when comparing the physical properties of the highly reactive slaked lime used in the present invention with those of industrial slaked lime JIS special grade B, the pore volume of the special grade slaked lime is 0.05 to 0.1 cm3. 3 / g, specific surface area (BET) is 11-15m 2 / g, whereas the pore volume of the highly reactive slaked lime in the present invention is 0.1 to 0.3 cm 3 / g, specific surface area (BET) is 30m 2 / g or more. In addition, the average particle size of special grade slaked lime is 5.0 to 7.0 μm, whereas the average particle size of highly reactive slaked lime is 8.0 to 12.0 μm.

[0031] Highly reactive slaked lime has a relatively large specific surface area (BET), which allows it to form a coating film with excellent strength and recoatability.

[0032] The content of highly reactive slaked lime is preferably 20 to 25% by weight. If the content of highly reactive slaked lime is less than 20% by weight, the moisture-regulating and adsorbent properties after finishing will decrease, while if the content exceeds 25% by weight, cracking and peeling due to shrinkage may occur.

[0033] The paint according to this embodiment can be used as an interior or exterior material for buildings such as ordinary houses, stores and commercial facilities, offices, medical and nursing care facilities, sports facilities, schools and educational facilities, etc. The paint may be provided in various forms, for example, as a solution, paste, gel, emulsion, or spray. The substrate that can be used as the base includes, without limitation, gypsum board, calcium silicate board, concrete, mortar, straight board, vinyl chloride wallpaper, paint primer wallpaper, old walls (plaster walls, sand walls, earth walls), and coating films made from aqueous emulsions.

[0034] Plaster walls are made by mixing slaked lime with a plant fiber called susa (sunsha) and mountain soil, and then kneading it with glue and kakumata glue. Unlike paints that use chemicals, plaster walls do not emit harmful gases during construction, and they have moisture absorption and adsorption properties, which not only prevent condensation but also absorb formaldehyde and other harmful gases emitted by other building materials, as well as cigarette smoke, and are expected to prevent indoor air pollution.

[0035] On the other hand, plaster walls are prone to cracking when coated onto gypsum boards or the like.

[0036] The paint of the present invention uses inorganic, highly reactive hydrated lime, and is therefore not prone to cracking like plaster walls, nor does it have poor humidity control properties. It is also highly safe, as it does not generate toxic gases when used as a building material or when incinerated and disposed of.

[0037] In terms of appearance, unlike ordinary wallpaper or paints containing chemicals, the natural texture of the plaster creates a high-quality space, and by using highly reactive hydrated lime with a larger average particle size than ordinary hydrated lime, when white pigment is used, the matte, porous white walls harmonize with the light, creating a gentle space.

[0038] <Construction method> To give an example of application of the paint according to the present invention, first, when concrete or mortar is used as the base substrate, the surface is prepared by drying thoroughly. For example, when the base is concrete, the surface is dried for 2 to 3 weeks after pouring, or until the moisture content is 10% or less and the pH is 10 or less.

[0039] Next, a primer coat is applied with a volatile paint sealer, and the paint according to the present invention is applied by a roller, brush, spraying, etc., in an amount of 0.15 kg / m 2 The paint is applied at a water dilution of 0-10% and left for at least 2 hours (first finish). 2 Apply (second finishing coat) diluted with water at 0-10% and allow to cure for at least 24 hours after application.

[0040] In order to demonstrate various performances of the paint according to the present invention, various measurements were carried out. The examples and comparative examples used in each measurement are as follows.

[0041] <Example> The paint of the present invention is applied to a gypsum board, and the components of the paint are 10% by weight of acrylic resin (acrylic emulsion resin), 30% by weight of water, 30% by weight of pigment, 10% by weight of additives, and 20% by weight of highly reactive hydrated lime.

[0042] <Comparative Example> A gypsum board with no paint applied was used as Comparative Example 1. Furthermore, a plaster paint made by another company (manufactured by Kansai Paint Co., Ltd., product name "Ares Shikui") was used as Comparative Example 2.

[0043] <Antiviral test> The test was conducted in accordance with ISO 21702. Specifically, 0.4 ml of virus solution was dropped onto a 10 cm square test piece and covered with a 4 cm square film. The virus solution used was a solution containing influenza virus (H3N2). The test piece was left to stand (contact) for 24 hours (contact time) at 25 ± 1°C and 90% RH or higher. After standing, the virus on the test piece was washed off and collected, and the virus infectivity was measured using the plaque method, and the antiviral activity value was calculated.

[0044] [Table 1]

[0045] As shown in Table 1 above, the number of virus particles in the example was 6.3, while the number of virus particles in Comparative Example 1 was 1.4 × 10 5 The antiviral activity value was 4.3. From the measurement results, it can be said that the number of virus particles (infectivity titer) was reduced by 99.99% in the Example compared to Comparative Example 1. In this way, by applying a film of the paint according to the present invention, viruses adhering to the walls of a building can be decomposed, and infection by viral infectious diseases can be effectively prevented.

[0046] <Antibacterial test> For the samples of each Example and Comparative Example 1 used in the antibacterial test, a coating of paint was formed on a glass substrate by pushing the spray nozzle 20 times. The samples of the Examples and Comparative Examples formed by the above-mentioned method were subjected to an antibacterial test according to the method of JIS Z2801 (film adhesion method), and the antibacterial activity value (using Escherichia coli) was confirmed. Test bacterial solution inoculation volume: 0.4 ml Surface area of ​​the coating film: 16cm 2

[0047] [Table 2]

[0048] As shown in Table 2 above, the number of live bacteria (E. coli) in the example was 0.63, while the number of live bacteria (E. coli) in Comparative Example 1 was 7.4 × 10 5 The antibacterial activity value (the number of viable bacteria in Comparative Example 1 immediately after inoculation - the number of viable bacteria in the Example after 24 hours) was 6.0. From the measurement results, it can be said that the number of viable bacteria in the Example was reduced by 99.99% compared to Comparative Example 1. As such, by applying a coating of the paint according to the present invention, high antibacterial properties are exhibited, and it can be said that a clean environment can be maintained even in hospitals, facilities, etc. where strict hygiene management is required.

[0049] <Deodorizing test> The test piece of the example was sealed in an Erlenmeyer flask so that the target gas components were at their initial concentrations. After 2 hours, the gas concentration was measured according to gas chromatography, and the reduction rate was calculated. Initial gas concentration: Isovaleric acid 38 ppm Measurement time: 2 hours Test piece: 50cm 2

[0050] [Table 3]

[0051] As shown in Table 3 above, in the example, the gas concentration after 2 hours was reduced by 99% compared to the initial concentration. As such, by applying a coating of the paint according to the present invention, high deodorizing properties are exhibited, and it is possible to adsorb and decompose unpleasant odors that cause everyday odors, and effectively purify the air inside buildings.

[0052] <Humidity control test> For the examples and comparative example 2, the amount of moisture absorbed and released was calculated based on "JIS A 6909 2010 7.32 Moisture absorption and release test for architectural finishing coating materials." 2 The above was created by applying the above in one coat.

[0053] [Table 4]

[0054] As shown in Table 4 above, the moisture absorption and desorption amount of Comparative Example 2 was 28 g / m 2 In contrast, the moisture absorption and desorption amount of the example is 33 g / m 2 It can be said that the moisture absorption and release properties (humidity control properties) of the Example were increased by 15% compared to Comparative Example 2. Therefore, by applying a coating film of the paint according to the present invention, high humidity control properties are exhibited, which helps maintain the humidity balance that causes the growth of mold and bacteria, improving indoor comfort.

[0055] As described above, by applying the paint of the present invention to a substrate such as gypsum board, the natural texture of the plaster creates a high-quality space, and the paint exhibits high levels of antiviral, antibacterial, deodorizing, and humidity-regulating properties, so the paint of the present invention can be widely and suitably used as a paint for new, unprecedented building materials.

Claims

1. A paint comprising an acrylic resin, water, a pigment, an additive, and a porous structure.

2. The paint according to claim 1, wherein the porous structure is made of highly reactive hydrated lime.

3. The specific surface area of ​​the highly reactive slaked lime is 30 m ２ / g or more, pore volume 0.1 to 0.3 cm ３ 3. The paint according to claim 1 or 2, wherein the viscosity is 1000 MPa.

4. 3. The paint according to claim 1, wherein the content of said highly reactive slaked lime is 20 to 25% by weight.

5. The paint according to claim 1 or 2, which, when applied, has an antiviral activity value of 4.0 or more in an antiviral test in accordance with ISO 21702:2019.

6. The paint according to claim 1 or 2, which, when applied, has an antibacterial activity value of 6.0 or more in an antibacterial test in accordance with JIS Z 2801:2010.

7. When coated, the moisture absorption and desorption amount is 30 g / m2 according to the moisture absorption and desorption test in accordance with JIS A 6909. ２ The paint according to claim 1 or 2, wherein the paint is as described above.

8. 3. The paint according to claim 1 or 2, wherein when the paint is applied, the reduction rate of gas concentration after 2 hours is 99% in a deodorizing property test based on gas chromatography.

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