Paint additives, coating film formation methods

Abstract

To provide a novel coating additive that can give an aqueous coating antiviral properties, and a coating layer forming method using the coating additive.SOLUTION: A coating additive with zinc oxide powder blended in a hydrophilic solvent is blended with an aqueous coating to prepare a zinc oxide-blended coating, and the zinc oxide-blended coating is applied to a coating object.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a paint additive for imparting antiviral properties to a water-based paint, and a method for forming a coating film using the paint additive. [Background technology]

[0002] Painting is not only carried out for the purpose of imparting color to an object to be painted, but may also be carried out for the purpose of imparting various functions such as weather resistance, rust prevention, or heat insulation.

[0003] Recently, paints containing deodorants and antibacterial agents have been developed to impart deodorizing and antibacterial functions to objects to be painted (see, for example, Patent Document 1 below). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-035075 Summary of the Invention [Problem to be solved by the invention]

[0005] In other words, when imparting a certain function to a paint, it is common to blend a substance with the desired function as an additive, and paints currently on the market are already blended with substances that have the desired function.

[0006] However, there are countless paints currently on the market, and the paint you want to use does not necessarily have the required functionality.In addition, there are currently very few paints on the market that have antiviral properties.

[0007] The present invention was completed in view of the above technical problems, and an object of the present invention is to provide a novel paint additive that can impart antiviral properties to water-based paint, and a method for forming a coating film using the paint additive. [Means for solving the problem]

[0008] The paint additive of the present invention, which solves the above technical problems, is a paint additive for imparting antiviral properties to water-based paint, and is characterized in that zinc oxide powder is blended with a hydrophilic solvent (hereinafter referred to as the "additive of the present invention").

[0009] In the additive of the present invention, the hydrophilic solvent preferably contains a lower alcohol as a main component.

[0010] The coating film forming method of the present invention for solving the above technical problems is a coating film forming method for forming an antiviral coating film on an object to be painted, and is characterized by carrying out a paint preparation step of obtaining a zinc oxide-containing paint by mixing the additive of the present invention with an aqueous paint, and an application step of applying the zinc oxide-containing paint to the object to be painted (hereinafter referred to as the "method of the present invention").

[0011] In the method of the present invention, in the paint preparation step, it is preferable to mix the additive of the present invention so that the amount of zinc oxide powder blended is 0.1 to 1 part by weight per 100 parts by weight of the water-based paint. [Effects of the Invention]

[0012] According to the present invention, it is possible to impart antiviral properties to a water-based paint, and to form a coating film having antiviral properties on the surface of an object to be painted. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment for carrying out the present invention will be described, but the present invention is not limited to this embodiment.

[0014] <Additive of the present invention> The additive of the present invention is a paint additive for imparting antiviral properties to water-based paints (paints that use water as a diluent), and is characterized by being composed of a "hydrophilic solvent" and "zinc oxide powder."

[0015] -Hydrophilic solvent- In the present invention, the term "hydrophilic solvent" refers to a liquid medium that has an affinity for water. Examples of hydrophilic solvents include water, ethyl alcohol, propyl alcohol (n-propyl alcohol and isopropyl alcohol), and lower alcohols (including diols and triols) such as ethylene glycol and propylene glycol. The hydrophilic solvent may also contain additives for purposes such as antibacterial and antifungal properties.

[0016] - Zinc oxide powder - In the present invention, zinc oxide powder refers to powdered zinc oxide (ZnO). In the field of conventional paints, zinc oxide has sometimes been added for antibacterial and deodorizing purposes, but zinc oxide has never been added to paints for antiviral purposes. In the present invention, the particle size of the zinc oxide powder is not particularly limited. However, since zinc oxide does not dissolve in the hydrophilic solvent, it is preferable to use a fine powder of 10 μm or less (preferably 1 μm or less), which is easily dispersed in the hydrophilic solvent. Furthermore, in consideration of ease of handling, the blending amount of zinc oxide powder relative to the hydrophilic solvent is preferably 5 to 20 wt %. While the JIS standard classifies zinc oxide into types 1 to 3 based on its purity, any type of zinc oxide is acceptable in the present invention.

[0017] <Method of the present invention> The method of the present invention is a coating film formation method for forming an antiviral coating film on the surface of an object to be coated, and includes a "paint preparation step" and an "application step."

[0018] -Paint adjustment process- In the paint preparation step, the additive of the present invention is mixed with an aqueous paint to obtain a zinc oxide-containing paint. Specifically, the additive of the present invention is mixed with a commercially available aqueous paint and stirred to prepare a zinc oxide-containing paint in which zinc oxide is uniformly dispersed in the aqueous paint. The amount of the additive of the present invention to be mixed with the aqueous paint is not particularly limited, but it is preferable to mix the additive of the present invention so that the amount of zinc oxide powder is 0.1 to 1 part by weight (more preferably 0.5 parts by weight or less) per 100 parts by weight of the aqueous paint so as not to affect the color of the aqueous paint.

[0019] -Coating process- In the coating step, the zinc oxide-containing paint is applied to an object to be coated. The object to be coated is not particularly limited, and examples thereof include buildings such as walls and roofs of buildings, or fences. The coating method is also not particularly limited, and coating means such as a brush or roller, as well as spraying, can be appropriately selected.

[0020] [Example] Table 1 below shows the formulations of the additives of the present invention in Examples 1 and 2. The amount of zinc oxide powder blended was 12% by weight in both cases. The particle size of the zinc oxide powder was measured by laser analysis. The propyl alcohol used was a mixed solvent of n-propyl alcohol and isopropyl alcohol (weight ratio 3:7).

[0021] [Table 1]

[0022] A zinc oxide-containing paint was obtained by adding the additive of the present invention according to each example to 100 parts by weight of a commercially available water-based paint so that the amount of zinc oxide powder was 0.25 parts by weight. This zinc oxide-containing paint was applied to a glass plate and thoroughly dried to form a coating film, after which a virus liquid (alpha strain coronavirus (provided by the National Institute of Infectious Diseases)) was dripped onto the coating film. As a comparative example, the virus liquid was also dripped onto a glass plate on which a coating film of water-based paint not containing the additive of the present invention had been formed.

[0023] After 60 minutes, the dropped virus solution was taken up by VeroE6 / TMPRSS2 cells, and the amount of virus was quantified (quantification at the Department of Disease Control and Pathophysiology, Department of Pathology, Shiga University of Medical Science).

[0024] As a result, a virus concentration of more than 30,000 (TCID50 / ml) was confirmed in the virus solution dropped onto the coating film of the water-based paint that did not contain the additive of the present invention, but the presence of the virus was not confirmed in the virus solution dropped onto the coating film that contained the additive of the present invention.

[0025] Similar test results were obtained when the amount of zinc oxide powder in the zinc oxide-containing paint was changed within the range of 0.1 to 1 part by weight.

[0026] From this, it was confirmed that according to the present invention, it is possible to impart antiviral properties to a water-based paint and to form a coating film having antiviral properties on the surface of an object to be painted.

[0027] The present invention can be embodied in various other forms without departing from its spirit or main features. Therefore, the above-described embodiments (examples) are merely illustrative in all respects and should not be interpreted as limiting. The scope of the present invention is defined by the claims and is not limited in any way by the text of the specification. Furthermore, all modifications and variations within the equivalent scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0028] The present invention can be suitably used as a means for imparting antiviral properties to an aqueous paint, and thereby forming a coating film having antiviral properties on the surface of an object to be painted.

Claims

1. A paint additive for imparting antiviral properties to a water-based paint, A paint additive characterized by comprising zinc oxide powder blended in a hydrophilic solvent containing a lower alcohol as a main component.

2. The paint additive according to claim 1, A zinc oxide-containing paint in which 5 to 20% by weight of zinc oxide powder is mixed with a hydrophilic solvent.

3. A coating film forming method for forming an antiviral coating film on an object to be coated, comprising: a paint preparation step of obtaining a zinc oxide-containing paint by mixing the paint additive according to claim 1 with an aqueous paint; A coating process of applying a zinc oxide-containing paint to an object to be painted; A coating film forming method characterized by carrying out the steps of:

4. The coating film forming method according to claim 3, In the paint preparation step, the paint additives are mixed so that the amount of zinc oxide powder blended is 0.1 to 1 part by weight per 100 parts by weight of the water-based paint.

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