Antibacterial composition and antibacterial aerosol product

Abstract

To provide an antibacterial composition and an antibacterial aerosol product capable of preventing precipitation and aggregation of inorganic fine powder exhibiting antibacterial action.SOLUTION: An antibacterial composition used as an antibacterial agent, comprising an inorganic fine powder dispersed in a solution containing a polyamide, wherein the solution containing a polyamide is obtained by adding a paste-like substance in which a polyamide is dispersed in an organic solvent or water at a concentration of 22% by mass or more and 25% by mass or less to the antibacterial composition in an amount of 0.5% by mass or more and 5% by mass or less.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to antimicrobial compositions and antimicrobial aerosol products. [Background technology]

[0002] Metals such as silver and their ions have long been known to exhibit bactericidal and antibacterial properties. For example, Patent Document 1 describes an inorganic antibacterial agent characterized by having fine antibacterial metal powder pressed onto a zeolite carrier. Patent Document 1 states that the agent has a stable, white color with excellent antibacterial activity, and that blending it with a resin can provide an antibacterial resin composition with improved heat resistance and color fastness.

[0003] In recent years, an antibacterial composition containing an inorganic antibacterial agent has been formulated together with a propellant to form an aerosol composition for antibacterial treatment, which is then pressurized and filled into a container and sprayed onto an object, thereby providing an antibacterial treatment to the surface of a product that does not contain an antibacterial component or a product for which further enhanced antibacterial properties are desired.

[0004] For example, Patent Document 2 describes an aerosol composition for antibacterial treatment that uses silver-supported zeolite, an inorganic antibacterial agent, as the antibacterial agent, and contains a dispersant and a propellant. The invention described in Patent Document 2 is said to have excellent dispersibility of the inorganic antibacterial agent, and to be able to impart antibacterial properties to the target object stably with good handleability.

[0005] The powder is made from 2-3 μm particles of zeolite carrying silver ions, which have bactericidal and antibacterial properties. Such powder-like substances are prone to secondary aggregation, and when dispersed in low-viscosity liquids, they tend to settle and aggregate, resulting in hard caking. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 5-70315 [Patent Document 2] Japanese Patent Publication No. 2021-187819 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made to solve this problem, and aims to provide an antibacterial composition and an antibacterial aerosol product that can prevent the settling and aggregation of inorganic fine powders that exhibit antibacterial activity. [Means for solving the problem]

[0008] One aspect of the present invention is an antibacterial composition used as an antibacterial agent, characterized in that the antibacterial composition comprises an inorganic fine powder dispersed in a solution containing a polyamide, and the polyamide-containing solution is a paste-like substance obtained by dispersing polyamide in an organic solvent or water at a concentration of 22% by mass or more and 25% by mass or less, and the solution is added to the antibacterial composition in an amount of 0.5% by mass or more and 5% by mass or less.

[0009] In this case, in one embodiment of the present invention, the inorganic fine powder may be silver-supported zeolite, and the inorganic fine powder may be added in a proportion of 0.05 mass % or more and 5 mass % or less.

[0010] In one aspect of the present invention, one or more resins selected from an acrylic resin, a urethane resin, a butyral resin, and a vinyl acetate resin may be further added.

[0011] Another aspect of the present invention is an antibacterial aerosol product, characterized in that the above-mentioned antibacterial composition is added with one or more propellants selected from DME (dimethyl ether), LPG (liquefied petroleum gas), a DME / LPG mixture, and N2 (nitrogen gas) as a propellant for aerosolization.

[0012] In this case, in another embodiment of the present invention, the ratio of the propellant to the antibacterial composition may be 30% by volume or more and less than 70% by volume.

[0013] In another aspect of the present invention, the contents may be filled in an aluminum container equipped with a valve and a button for spraying the contents. [Effects of the Invention]

[0014] According to the present invention, it is possible to prevent the settling and aggregation of inorganic fine powders that exhibit antibacterial activity. DETAILED DESCRIPTION OF THE INVENTION

[0015] The following describes in detail preferred embodiments of the present invention. Note that the embodiments described below do not unduly limit the content of the present invention as defined in the claims, and not all of the configurations described in the embodiments are necessarily essential as means for solving the problems of the present invention.

[0016] One aspect of the present invention is an antibacterial composition used as an antibacterial agent, which comprises an inorganic fine powder dispersed in a solution containing a polyamide, and the polyamide-containing solution is a paste-like substance in which polyamide is dispersed in an organic solvent or water at a concentration of 22% by mass or more and 25% by mass or less, and the paste-like substance is added to the antibacterial composition in an amount of 0.5% by mass or more and 5% by mass or less.

[0017] Polyamide is a general term for polymers in which monomers are linked by amide bonds (-CONH-). In the present invention, the type of polyamide is not particularly limited, but as an example, a polymeric polyamide amine salt can be used.

[0018] The polyamide is used in a paste form dispersed in water or an organic solvent such as glycol ether to facilitate dispersion in the system. The concentration at this stage is 22% by mass or more and 25% by mass or less. In the present invention, this paste-form polyamide is added to the antibacterial composition at a concentration of 0.5% by mass or more and 5% by mass or less. This concentration range prevents the settling and aggregation of the inorganic fine powder having antibacterial activity and improves redispersibility. If the amount of polyamide added exceeds the above range, clouding of colored wallpaper may occur, since the antibacterial composition according to one embodiment of the present invention is intended for use as a spray on indoor wallpaper.

[0019] The inorganic fine powder is not particularly limited as long as it has antibacterial properties, but one example is silver-loaded zeolite, which is a type of porous ceramic that supports silver ions. Zeolite with a particle size of 0.5 to 5 μm is preferably used. Furthermore, good results are obtained in antibacterial activity tests when the amount of silver-loaded zeolite added is 0.05% by mass or more and 5% by mass or less.

[0020] In one embodiment of the present invention, it is preferable that one or more types selected from acrylic resins, urethane resins, butyral resins, and vinyl acetate are further added. These serve as antibacterial coating agents. Important factors for these polymer coating agents are that they meet the water resistance classification 1 of the Antibacterial Products Technology Council, that the dried coating film does not dissolve even when immersed in water, that the solvents contained in the components are soluble in ethanol or water, and that they are also good solvents in mixed solutions of ethanol and water. Since the intended use is for indoor antibacterial purposes, it is also important that the main solvent is low in flammability and has little odor.

[0021] Another aspect of the present invention is an antibacterial aerosol product characterized in that the antibacterial composition described above is supplemented with one or more propellants selected from DME (dimethyl ether), LPG (liquefied petroleum gas), a DME / LPG mixture, and N2 (nitrogen gas) as a propellant for aerosolization. When the prepared liquid is formulated with a mixture of alcohol and water as a solvent in the binder, the amount of DME in the water-based prepared liquid is important in terms of compatibility, so it is preferable to vary the ratio from 100% to DME / LPG = 30 / 70.

[0022] The ratio of the propellant to the antibacterial composition is preferably 30% by volume or more and 70% by volume or less. The ratio of the preparation to the propellant is important to obtain an ideal spray state, and the mixing ratio of the propellant to the antibacterial composition is preferably set at a lower limit of 30% by volume and an upper limit of 70% by volume to improve atomization.

[0023] An antibacterial aerosol product according to one embodiment of the present invention is filled into an aluminum container equipped with a valve and button for spraying the contents. Valves include upright and inverted valves, and either type can be used. Regarding the button, various hole diameters have different functions, and a straight button is usually used, but a mechanical button can also be selected when the amount of propellant is small. Regarding the aerosol container, while materials such as tinplate and aluminum are available, aluminum cans are optimal because the antibacterial coating solution mixed with water may corrode the container.

[0024] As explained above, according to the present invention, an antibacterial aerosol product can be produced that prevents the settling and aggregation of inorganic fine powders that exhibit antibacterial properties. While the present invention will be described in the examples below, it is not limited to these and many modifications are technically possible. In particular, it has become possible to produce an ideal spray without causing the inorganic fine powders to aggregate. [Example]

[0025] EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples in any way.

[0026] Example 1 In Example 1, 0.1% by mass of silver-supported zeolite was added, and 0.2%, 0.5%, 1.0%, 2.0%, and 3.0% by mass of polyamide were added. These solutions were filled into glass bottles and left to stand at room temperature for two weeks. The movement of the precipitate was then observed when the glass bottles were shaken. Furthermore, the well-shaken preparations were applied to a transparent glass plate and a black polyvinyl chloride resin surface, and the state of the applied solution was observed.

[0027] The evaluation criteria in Example 1 are as follows: 〇: Sedimentation and agglomerates can be quickly redispersed △: Settling and agglomerates can be quickly redispersed, but some particles remain ×: Settling and agglomerates cannot be quickly redispersed. The results of Example 1 are shown in Table 1. [Table 1]

[0028] The results in Table 1 show that when the amount of polyamide added is 0.5% to 2.0%, hard caking does not occur, the particle dispersion state is good, and no cloudiness occurs on the coated surface when applied, resulting in an optimal state.

[0029] Example 2 In Example 2, a formulation according to one embodiment of the present invention and a propellant were mixed in ratios of 80 / 20 vol%, 70 / 30 vol%, 60 / 40 vol%, 50 / 50 vol%, 40 / 60 vol%, and 30 / 70 vol%, respectively, and the mixtures were sprayed onto a transparent glass plate and a black polyvinyl chloride resin surface, and the results were observed. The results of Example 2 are shown in Table 2. [Table 2]

[0030] The results in Table 2 show that when the propellant ratio is lower than 30% by volume (20% by volume), the spray particles become coarse and dripping occurs, while when the propellant ratio is 70% by volume, the particles become ultrafine particles and scatter violently. Therefore, it was found that the optimum propellant ratio is between 30% and 70% by volume.

[0031] Although the embodiments and examples of the present invention have been described in detail above, it will be readily apparent to those skilled in the art that many modifications are possible without substantially departing from the novel features and effects of the present invention. Therefore, all such modifications are intended to be included within the scope of the present invention.

[0032] For example, a term described at least once in the specification or drawings together with a different term having a broader or similar meaning can be replaced with that different term anywhere in the specification or drawings. Furthermore, the configurations of the antibacterial composition and antibacterial aerosol product are not limited to those described in the embodiments and examples of the present invention, and various modifications are possible.

Claims

1. An antimicrobial composition for use as an antimicrobial agent, comprising: The inorganic fine powder is dispersed in a solution containing a polyamide, The antibacterial composition is characterized in that the solution containing the polyamide is a paste-like substance in which polyamide is dispersed in an organic solvent or water at a concentration of 22% by mass or more and 25% by mass or less, and the paste-like substance is added to the antibacterial composition at a concentration of 0.5% by mass or more and 5% by mass or less.

2. The inorganic fine powder is silver-supported zeolite, 2. The antibacterial composition according to claim 1, wherein the inorganic fine powder is added in an amount of 0.05% by mass or more and 5% by mass or less.

3. 3. The antibacterial composition according to claim 2, further comprising at least one selected from the group consisting of acrylic resins, urethane resins, butyral resins, and vinyl acetate resins.

4. The antibacterial composition according to any one of claims 1 to 3, further comprising DME (dimethyl ether), LPG (liquefied petroleum gas), a DME / LPG mixture, N ２ (nitrogen gas)

5. 5. The antibacterial aerosol product according to claim 4, wherein the ratio of the propellant to the antibacterial composition is 30% by volume or more and less than 70% by volume.

6. 6. The antibacterial aerosol product according to claim 5, which is filled in an aluminum container equipped with a valve and a button for spraying the contents.

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