Coating composition

Abstract

To provide a coating composition capable of suppressing discoloration of at least one active ingredient selected from the group consisting of silver and silver compounds contained in a coating.SOLUTION: The antibacterial agent comprises at least one active ingredient selected from the group consisting of silver and silver compounds and a compound represented by general formula (I) (wherein R1 is H or acetyl, R2 is H or methyl, R3 is ethyl when R2 is H, and R3 is methyl when R2 is methyl). And at least one ether compound represented by formula (I): SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a coating composition. [Background technology]

[0002] Antiviral and / or antibacterial paints containing silver or silver compounds have been developed (for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 11-35412 [Patent Document 2] Patent Publication No. 2016-190808 Summary of the Invention [Problem to be solved by the invention]

[0004] Silver and silver compounds discolor in paint. For example, silver molybdate, a silver compound, is yellowish-white, but the silver molybdate contained in paint discolors to reddish-brown during storage. This causes the color of paint containing silver to change color due to the influence of the silver molybdate. Furthermore, discoloration of silver molybdate could lead to a deterioration in antiviral and antibacterial properties.

[0005] The present invention provides a coating composition that can inhibit discoloration of one or more active ingredients selected from the group consisting of silver and silver compounds in the coating.

[0006] The present inventors have conducted extensive research to solve the above problems and have arrived at the present invention. [1] One or more active ingredients selected from the group consisting of silver and silver compounds General formula (I) TIFF2026026416000001.tif2360 [In the formula, R1 represents a hydrogen atom or an acetyl group, R2 represents a hydrogen atom or a methyl group, and when R2 represents a hydrogen atom, R3 represents an ethyl group, and when R2 represents a methyl group, R3 also represents a methyl group.] and at least one ether compound represented by the formula: [2] The above coating composition, wherein the silver compound is silver oxide. [3] The above coating composition, wherein the silver compound is silver molybdate. [4] A paint comprising the above paint composition. [5] The above paint, characterized in that the content of the ether compound is 15 to 60% by weight based on the weight of the total amount of the paint. to provide. [Effects of the Invention]

[0007] According to the present invention, it is possible to inhibit discoloration of one or more active ingredients selected from the group consisting of silver and silver compounds contained in a paint. DETAILED DESCRIPTION OF THE INVENTION

[0008] The silver compounds usable in the present invention include chlorides, acetates, sulfides, iodides, bromides, peroxides, oxides, molybdates, etc. Of these, silver oxide and molybdates are preferred.

[0009] Examples of the ether compound represented by general formula (I) used in the present invention include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether, and propylene glycol monomethyl ether acetate. The content of the ether compound is usually 5 to 80% by weight, preferably 15 to 60% by weight, based on the total weight of the coating material.

[0010] The coating composition of the present invention is used by being blended into a coating material. Generally, paints are produced through a pre-mixing step of mixing resin, pigment, and solvent, a dispersing step of refining the particles of the pre-mixed resin and pigment, a compounding step of adding and mixing additives, a toning step of adding and mixing primary colors, and a filling step of filtering and then filling the resulting mixture into a container. The paint composition of the present invention is usually blended in the compounding step. It can also be blended into commercially available paints.

[0011] Examples of the resin component include alkyd resin, polyester resin, acrylic resin, urethane resin, epoxy resin, fluororesin, silicone resin, unsaturated polyester resin, melamine resin, phenol resin, nitrocellulose resin, vinyl acetate resin, and vinyl chloride resin.

[0012] Examples of the pigment component include titanium oxide, carbon black, iron oxide, zinc phosphate, ammonium phosphate, calcium carbonate, clay, talc, barium sulfate, and silica.

[0013] Examples of the solvent include toluene, xylene, isopropyl alcohol, methyl ethyl ketone, methyl isobutyl ketone, and ethyl acetate.

[0014] Examples of the additives include pigment dispersants, thickeners, pigment anti-settling agents, polymerization inhibitors, antifoaming agents, leveling agents, plasticizers, mildew inhibitors, ultraviolet absorbers, and light stabilizers.

[0015] A paint containing the coating composition of the present invention is applied to an article using a brush, roller, sprayer, etc. For example, it is applied to walls and floors of buildings, and furniture such as desks and chairs. It can also be applied to doorknobs and plastic films or sheets such as polyethylene and polypropylene, and then attached to the image display unit of a portable electronic device such as a smartphone.

[0016] An antiviral coating film is formed on the surface of an article coated with this paint. Viruses on the article are inactivated after a few hours, so the coating film can be peeled off after that. Furthermore, if the coating film is left attached and used, viruses adhering to the coating film can be inactivated. [Example]

[0017] The present invention will be further explained below with reference to examples, but the present invention is not limited to these examples.

[0018] [Production of silver molybdate] An aqueous silver nitrate solution was prepared by dissolving 9.1 g of silver nitrate (Kanto Chemical Co., Inc.) in 100 ml of ion-exchanged water. To this solution, an aqueous sodium molybdate dihydrate solution, prepared by dissolving 6.5 g of sodium molybdate dihydrate (Kanto Chemical Co., Inc.) in 100 ml of ion-exchanged water, was added dropwise over 30 minutes while stirring to produce silver molybdate. Stirring was continued for another hour, followed by filtration, and the resulting silver molybdate was washed with ion-exchanged water. The thus-prepared hydrous silver molybdate was kept in a thermostatic bath at 100°C to obtain a yellowish-white silver molybdate. [Example]

[0019] 7.5 mg of the silver molybdate obtained above was mixed with 2000 mg of ethylene glycol monoethyl ether to obtain a coating composition of the present invention (hereinafter referred to as coating composition-1 of the present invention). [Example]

[0020] 7.5 mg of the silver molybdate obtained above was mixed with 2000 mg of ethylene glycol monoethyl ether acetate to obtain a coating composition of the present invention (hereinafter referred to as coating composition-2 of the present invention). [Example]

[0021] 3.75 mg of the silver molybdate obtained above was mixed with 5,000 mg of propylene glycol monomethyl ether acetate to obtain a coating composition of the present invention (hereinafter referred to as coating composition-3 of the present invention). [Example]

[0022] 7.5 mg of the silver molybdate obtained above was mixed with 2,000 mg of propylene glycol monomethyl ether acetate to obtain a coating composition of the present invention (hereinafter referred to as coating composition-4 of the present invention). Comparative Example 1

[0023] 7.5 mg of the silver molybdate obtained above was mixed with 2000 mg of ethylene glycol monomethyl ether to obtain a coating composition (hereinafter referred to as Comparative Composition-1).

[0024] 7.5 mg of the silver molybdate obtained above was mixed with 2000 mg of ethylene glycol isobutyl ether to obtain a coating composition (hereinafter referred to as comparative composition-2).

[0025] [Creating paint] Each of the present invention coating compositions 1, 2, and 4 and comparative compositions 1 and 2 was thoroughly mixed with 8,000 mg of Himex V0355 / 3 (a coating containing 15% by weight of polyurethane resin, manufactured by H&K Corporation) in a No. 7 vial (manufactured by Maruemu Co., Ltd.) to prepare a coating with a weight ratio of silver molybdate to resin component of 1:160 (referred to as present invention coatings 1, 2, and 4 and comparative coatings 1 and 2, respectively).

[0026] On the other hand, for the present invention coating composition-3, 4000 mg of Himex V0355 / 3 was thoroughly mixed in a No. 7 vial to prepare a coating with a weight ratio of silver molybdate to resin component of 1:160 (referred to as present invention coating-3).

[0027] As a blank sample, 7.5 mg of silver molybdate and 8000 mg of Himex V0355 / 3 were thoroughly mixed in a No. 7 vial to prepare a paint (hereinafter referred to as the blank paint) with a weight ratio of silver molybdate to resin component of 1:160.

[0028] The various paints obtained above, the blank paint and Himex V0355 / 3 were stored in a room at 25°C for one week, and then the degree of discoloration was measured by the method described below.

[0029] An O-ring (outer diameter 20 mm, inner diameter 10 mm, thickness 1.2 mm) was placed on a white polypropylene sheet (manufactured by Acrysunde Co., Ltd., product number: PS-2 white, 60 mm x 90 mm x 0.75 mm). Each of the stored Inventive Paints 1 to 4, Comparative Paints 1 and 2, Blank Paint, and Himex V0255 / 3 obtained above was dropped onto the inside of the ring in an amount of 15 mg of resin component, and the sheet was then allowed to stand in a room at 25°C for 24 hours.

[0030] For each polypropylene sheet onto which the paint was dropped, L*a*b was measured using a color difference meter (manufactured by Konica Minolta, model CT-210, measurement mode CIE1976). The L*a*b values ​​of a polypropylene sheet onto which only Himex V0255 / 3 was dropped were used as the standard, and the difference in color difference values ​​ΔE was calculated using the following formula. The results are shown in the table. ΔE={(ΔL) 2 +(Δa) 2 +(Δb) 2} 1 / 2

[0031] [table] TIFF2026026416000002.tif20129

Claims

1. At least one active ingredient selected from the group consisting of silver and silver compounds, A paint composition comprising one or more selected from the group consisting of ethylene glycol monoethyl ether and ethylene glycol monoethyl ether acetate.

2. The paint composition according to claim 1, wherein the silver compound is silver oxide.

3. The paint composition according to claim 1, wherein the silver compound is silver molybdate.

4. A paint comprising the paint composition described in any one of claims 1 to 3.