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JP-7855094-B2 - Antiviral coating film, method for manufacturing an antiviral coating film, and coated article

JP7855094B2JP 7855094 B2JP7855094 B2JP 7855094B2JP-7855094-B2

Inventors

  • 泉谷 佑

Assignees

  • 三菱電機株式会社

Dates

Publication Date
20260507
Application Date
20230210

Claims (9)

  1. An antiviral coating film formed on the surface of a substrate, Multiple plate-like inorganic particles, The system comprises a binder resin for agglomerating the plurality of plate-shaped inorganic particles, The amount of the plurality of plate-shaped inorganic particles is 200% by volume or more and 2000% by volume or less relative to the content of the binder resin. The thickness of the antiviral coating film is 1 μm or more and 100 μm or less. The average primary particle diameter of the plurality of plate-like inorganic particles is 1 μm or more and 50 μm or less. The average thickness of the plurality of plate-like inorganic particles is 5 nm or more and 50 nm or less. The arithmetic mean roughness of the surface of the antiviral coating film is 0.5 μm or more and 10 μm or less. An antiviral coating film characterized in that the average distance between adjacent protrusions on the aforementioned surface is 20 nm or more and 1 μm or less.
  2. An antiviral coating film formed on the surface of a substrate, Multiple plate-like inorganic particles, The system comprises a binder resin for agglomerating the plurality of plate-shaped inorganic particles, The amount of the plurality of plate-shaped inorganic particles is 200% by volume or more and 2000% by volume or less relative to the content of the binder resin. The thickness of the antiviral coating film is 1 μm or more and 100 μm or less. The average primary particle diameter of the plurality of plate-like inorganic particles is 1 μm or more and 50 μm or less. The average thickness of the plurality of plate-like inorganic particles is 5 nm or more and 50 nm or less. An antiviral coating film characterized in that each of the plurality of plate-shaped inorganic particles is a calcium silicate particle.
  3. An antiviral coating film formed on the surface of a substrate, Multiple plate-like inorganic particles, The system comprises a binder resin for agglomerating the plurality of plate-shaped inorganic particles, The amount of the plurality of plate-shaped inorganic particles is 200% by volume or more and 2000% by volume or less relative to the content of the binder resin. The thickness of the antiviral coating film is 1 μm or more and 100 μm or less. The average primary particle diameter of the plurality of plate-like inorganic particles is 1 μm or more and 50 μm or less. The average thickness of the plurality of plate-like inorganic particles is 5 nm or more and 50 nm or less. The binder resin further comprises a plurality of hydrophilic inorganic fine particles in an amount of 25% to 500% by volume relative to its content. The average primary particle diameter of the plurality of hydrophilic inorganic fine particles is between 4 nm and 100 nm. An antiviral coating film characterized in that the water contact angle of the hydrophilic inorganic fine particles located on the surface of the antiviral coating film, among the plurality of hydrophilic inorganic fine particles, is less than 30 degrees.
  4. The antiviral coating film according to any one of claims 1 to 3, characterized in that the binder resin is a hydrophilic resin.
  5. The arithmetic mean roughness of the surface of the antiviral coating film is 0.5 μm or more and 10 μm or less. The average distance between adjacent protrusions on the aforementioned surface is between 20 nm and 1 μm. The antiviral coating film according to feature 2 or 3.
  6. Each of the aforementioned plurality of plate-shaped inorganic particles is a calcium silicate particle. The antiviral coating film according to feature 1 or 3.
  7. The binder resin further comprises a plurality of hydrophilic inorganic fine particles in an amount of 25% to 500% by volume relative to its content. The average primary particle diameter of the plurality of hydrophilic inorganic fine particles is between 4 nm and 100 nm. The water contact angle of the hydrophilic inorganic particles located on the surface of the antiviral coating film, among the plurality of hydrophilic inorganic particles, is less than 30 degrees. The antiviral coating film according to feature 1 or 2.
  8. The process involves applying a coating composition containing multiple plate-shaped inorganic particles, which are secondary particles formed by the aggregation of multiple plate-shaped inorganic fine particles, a binder resin, multiple hydrophilic inorganic fine particles, and water to the surface of a substrate. A method for producing an antiviral coating film, comprising the step of drying the coating composition applied to the surface of the substrate.
  9. A coated article characterized by comprising an antiviral coating film according to any one of claims 1 to 3 .

Description

This disclosure relates to an antiviral coating film formed on the surface of a substrate, a method for manufacturing an antiviral coating film, and a coated article. In recent years, so-called "pandemics," in which infectious diseases transmitted by various microorganisms spread rapidly in a short period of time, have become a problem, and deaths have been reported due to infections with viruses such as coronaviruses, noroviruses, and avian influenza. Therefore, the development of antiviral agents that exhibit antiviral activity against various viruses is being actively pursued. In fact, resins containing antiviral agents composed of metals such as silver or organic compounds with antiviral activity are being applied to various components, and components containing materials on which antiviral agents are supported are being manufactured. Patent Document 1 discloses an antimicrobial member in which a binder cured product containing an antimicrobial component is fixed to the surface of a substrate, and the arithmetic mean roughness of the surface of the substrate containing the binder cured product, in accordance with JIS (Japanese Industrial Standards) B 0601, is greater than 4 μm and 50 μm or less. Furthermore, in recent years, technologies have been reported that impart antiviral properties by utilizing the uneven surface structure of materials, without the use of antiviral agents. Patent Document 2 discloses an antiviral surface treatment method for a component, which provides an antiviral effect to the surface of a component by using a shot blasting method to randomly form countless minute irregularities on the surface of the component, where the minimum value of the irregularity pitch is 0.3 μm or more and the maximum value is 1.0 μm or less, and the minimum value of the recess depth is 0.01 μm or more and the maximum value is 0.3 μm or less. Japanese Patent Publication No. 2021-50236Japanese Patent Publication No. 2022-28394 Cross-sectional view of the antiviral member according to Embodiment 1Cross-sectional view showing the spacing of protrusions on the surface of the antiviral coating film according to Embodiment 1.Cross-sectional view of the antiviral member according to Embodiment 2 The antiviral coating film, the method for manufacturing the antiviral coating film, and the coated article according to the embodiment will be described in detail below with reference to the drawings. Embodiment 1. Figure 1 is a cross-sectional view of an antiviral member 1 according to Embodiment 1. Figure 1 schematically shows a cross-section of the antiviral member 1. The antiviral member 1 has a base material 10 and an antiviral coating film 11 located on the surface of the base material 10. Figure 1 schematically shows a cross-section of the antiviral coating film 11. As shown in Figure 1, the antiviral coating film 11 is formed on the surface of the base material 10. For example, the base material 10 is made of polystyrene. The antiviral coating film 11 has a plurality of plate-shaped inorganic particles 20 and a binder resin 30 for agglomerating the plurality of plate-shaped inorganic particles 20. For example, each of the plurality of plate-shaped inorganic particles 20 is a calcium silicate particle, and the binder resin 30 is a hydrophilic resin. The amount of multiple plate-shaped inorganic particles 20 is 200% to 2000% by volume relative to the content of the binder resin 30. The thickness of the antiviral coating film 11 is 1 μm to 100 μm. The average primary particle diameter of the multiple plate-shaped inorganic particles 20 is 1 μm to 50 μm. In this application, "average primary particle diameter" means the average particle size measured by light scattering. The average thickness of the multiple plate-shaped inorganic particles 20 is 5 nm to 50 nm. An antiviral member 1 can be formed by applying a coating composition obtained by dissolving and dispersing multiple plate-shaped inorganic particles 20 and a binder resin 30 in water or a solvent to the surface of a substrate 10, and then drying the applied coating composition and the substrate 10. The binder resin 30 used in the antiviral coating film 11 and the coating composition is preferably a solvent-soluble resin or a water-dispersible resin. When performing antiviral evaluation of the antiviral coating film in accordance with ISO (International Organization for Standardization) 21702, the test virus solution is inoculated onto the surface of the test piece, and the test is performed with a resin film covering it to prevent drying of the test virus solution, and the change in virus concentration is evaluated. In this case, if the binder resin used in the antiviral coating film has poor water resistance, dissolution, swelling, or peeling of the binder resin may occur during the antiviral evaluation test, so a water-soluble resin is not preferred as the binder resin 30. However, this does not apply if a reactive compound such as a crosslinking agent