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JP-7854588-B1 - Coating composition, method for forming a coating layer, and coating layer

JP7854588B1JP 7854588 B1JP7854588 B1JP 7854588B1JP-7854588-B1

Abstract

[Problem] To provide a coating layer suitable for application to moving objects such as automobiles, as well as tires, wheels, and window glass, that offers excellent antistatic properties, gloss, moisture, stain resistance, water repellency, durability, driving stability, and cost-effectiveness. [Solution] The coating composition of the present invention is a coating composition used by applying or spraying it onto a moving body such as an automobile, and contains a binder, a nanotransition metal, an ionic liquid, and water, wherein the nanotransition metal is present in an amount of 0.0005 to 0.25% by weight and the ionic liquid is present in an amount of 0.05 to 15% by weight. [Selection Diagram] None

Inventors

  • 近藤 貴裕
  • 近藤 優華

Assignees

  • 株式会社西日本ケミカル

Dates

Publication Date
20260507
Application Date
20250827

Claims (8)

  1. A coating composition used by applying or spraying it onto automobiles and tires, wheels, windows, motorcycles, railway vehicles, heavy machinery, ships, aircraft, agricultural machinery, and construction machinery, A coating composition comprising a binder, a nanotransition metal, an ionic liquid, and water, wherein the nanotransition metal is present in an amount of 0.0005 to 0.25% by weight and the ionic liquid in an amount of 0.05 to 15% by weight, and the nanotransition metal is nanogold, nanoniobium, or nanozirconium.
  2. A coating composition according to claim 1, comprising carbon nanotubes or an antistatic agent.
  3. A coating composition according to claim 1, comprising carbon nanotubes and an antistatic agent.
  4. The coating composition according to any one of claims 1 to 3, wherein the weight ratio of the ionic liquid to the nanotransition metal is 20/1 to 2000/1.
  5. A method for forming a coating layer, comprising applying or spraying the coating composition described in any one of claims 1 to 3 onto the surface of an automobile, tires, wheels, windows, motorcycles, railway vehicles, heavy machinery, ships, aircraft, agricultural machinery, and construction machinery, and forming a cured coating film by allowing the moisture to evaporate.
  6. A coating layer formed by the coating composition according to any one of claims 1 to 3 .
  7. A method for forming a coating layer, comprising: applying or spraying a coating composition according to any one of claims 1 to 3, having a solid content concentration of 15 parts by weight or more, onto the surface of an automobile, tires, wheels, windows, motorcycles, railway vehicles, heavy machinery, ships, aircraft, agricultural machinery, and construction machinery; forming a cured coating film by allowing the water to evaporate; and applying or spraying a coating composition according to any one of claims 1 to 3, having a solid content concentration of less than 15 parts by weight, onto the surface of the cured coating film; forming a cured coating film by allowing the water to evaporate.
  8. A coating layer having a hardened coating film formed by a coating composition according to any one of claims 1 to 3 having a solid content concentration of less than 15 parts by weight, on the surface of a hardened coating film formed by a coating composition according to any one of claims 1 to 3 having a solid content concentration of 15 parts by weight or more.

Description

This invention relates to a coating composition, a method for forming a coating layer by applying or spraying this coating composition onto automobiles and tires, wheels, windows, motorcycles, railway vehicles, heavy machinery, ships, aircraft, agricultural machinery, and construction machinery, and a coating layer formed by applying or spraying this coating composition. Conventionally, coating agents primarily composed of silicones and siloxanes have been used on the exteriors of mobile vehicles such as automobiles, motorcycles, railway cars, heavy machinery, ships, aircraft, agricultural machinery, and construction equipment for purposes such as protection, stain resistance, water repellency, oil repellency, improved aesthetics, and fade prevention. Treatment with these coating agents has been widely used. On the other hand, in the current period of social structural transformation, the electrification and smartening of mobile vehicles such as automobiles are progressing, and for purposes such as safety, weight reduction, and improved fuel efficiency, there is a shift from metal to resin materials such as fiber-reinforced plastic (FRP) and carbon fiber-reinforced plastic (CFRP) in vehicle body components. However, these resin materials accumulate static electricity due to contact and friction between the moving object and the air. An increase in these accumulated amounts could adversely affect the electronic circuits of the control and propulsion systems, and the static electricity itself could create resistance to the air, reducing the driving performance of the mobile vehicle, such as its stability. As vehicle body components tend to shift from metal to plastic materials, it is expected that the amount of static electricity accumulated will increase compared to conventional vehicles. Although coating agents with antistatic properties that can suppress these issues have been studied in recent years, they have not yet fully satisfied the driving performance, such as the driving stability of moving vehicles. Furthermore, it is anticipated that the demand for coating agents with antistatic properties will increase for electric vehicles (BEVs) and other vehicles that run primarily on electricity in the future. Furthermore, surfactant-based antistatic agents, used to reduce static electricity buildup, have poor durability due to being washed away with water, so it was necessary to develop an antistatic function with longer-lasting properties. An antistatic coating composition containing a specific amount of a sulfonate with a specific structure has been proposed for use as a suitable coating for automobile exteriors and interiors, building materials, machinery, electrical products, general household goods, decorative items, etc., due to its excellent antistatic properties and good transparency (Japanese Patent Publication No. 7-118571). Furthermore, with the aim of providing a coating agent that combines excellent antistatic function and water-repellent/hydrophobic properties, suitable for application to automobile body components, particularly those made of resin materials such as plastics and fiber-reinforced plastics (FRP), a coating agent composition comprising a specific amount of water-dispersible polyorganosiloxane, pyridinium salt-based ionic liquid, and water has been proposed (Japanese Patent Publication No. 7057879). Japanese Unexamined Patent Publication No. 7-118571Patent No. 7057879 The following describes examples and embodiments of the present invention, but the present invention is not limited thereto. The binder of the present invention is used for the purpose of fixing nanotransition metals such as nanogold, nanoniobium, nanozirconium, and ionic liquids after applying or spraying the coating composition of the present invention onto automobiles, tires, wheels, windows, motorcycles, railway vehicles, heavy machinery, ships, aircraft, agricultural machinery, and construction machinery, and drying the mixture. A known binder can be appropriately selected and used depending on the target object, such as an automobile. Specifically, examples of binders include water-dispersible silicones and modified silicones. The nanotransition metals of the present invention, such as nanogold, nanoniobium, and nanozirconium, have high affinity for objects such as automobiles and are used not only to impart durability and longevity, but also to produce a coating film that has a moist gloss and a metallic appearance, as well as providing antistatic and antifouling properties. The average particle size of the nanotransition metal must be 200 nm or less, preferably 100 nm or less, more preferably 50 nm or less, and particularly preferably 30 nm or less. Examples of nanotransition metals include nanogold, nanoniobium, and nanozirconium. The amount of nano-transition metals in the present invention, specifically nano-gold, nano-niobium, and nano-zirconium, must be 0.0005 to 0.25% by weight, preferably 0.001 to 0.2%