JP-7857176-B2 - Vehicle exterior parts

JP7857176B2JP 7857176 B2JP7857176 B2JP 7857176B2JP-7857176-B2

Inventors

片山幸祐
小林雄太

Assignees

株式会社アイシン
アイシン辰栄株式会社

Dates

Publication Date: 20260512
Application Date: 20220704

Claims (5)

A vehicle exterior part comprising a base material and a multi-layer coating film covering the surface of the base material, The aforementioned multi-layer coating film is The first coating film closest to the substrate, A second coating film is in contact with the first coating film and covers a portion of the surface of the first coating film, A third coating film that is transparent and covers the first coating film and the second coating film so as to be in contact with the second coating film and the portion of the first coating film that is not covered by the second coating film, Equipped with, The refractive index of the third coating film is 1.5210 or higher. The substrate comprises a thermoplastic resin material that softens at temperatures exceeding 80°C. The glass transition temperatures of the first coating film and the second coating film are 80°C or lower. Vehicle exterior parts.
A vehicle exterior part comprising a base material and a multi-layer coating film covering the surface of the base material, The aforementioned multi-layer coating film is The first coating film closest to the substrate, A second coating film is in contact with the first coating film and covers a portion of the surface of the first coating film, A third coating film that is transparent and covers the first coating film and the second coating film so as to be in contact with the second coating film and the portion of the first coating film that is not covered by the second coating film, Equipped with, The refractive index of the third coating film is 1.5210 or higher. The glass transition temperature of the second coating is lower than that of the third coating. Vehicle exterior parts.
An exterior part of a vehicle according to claim 2 , The glass transition temperature of the second coating film is 40°C or lower. The glass transition temperature of the third coating film is 80°C or higher and below the softening temperature of the substrate. Vehicle exterior parts.
A vehicle exterior part comprising a base material and a multi-layer coating film covering the surface of the base material, The aforementioned multi-layer coating film is The first coating film closest to the substrate, A second coating film is in contact with the first coating film and covers a portion of the surface of the first coating film, A third coating film that is transparent and covers the first coating film and the second coating film so as to be in contact with the second coating film and the portion of the first coating film that is not covered by the second coating film, Equipped with, The refractive index of the third coating film is 1.5210 or higher. The second coating film is A colored film that has been colored to a predetermined color, A transparent film is laminated on the side of the third coating film of the colored film, and is transparent with a glass transition temperature lower than that of the third coating film. Equipped with, The transparent film is in direct contact with the third coating film. Vehicle exterior parts.
A vehicle exterior part comprising a base material and a multi-layer coating film covering the surface of the base material, The aforementioned multi-layer coating film is The first coating film closest to the substrate, A second coating film is in contact with the first coating film and covers a portion of the surface of the first coating film, A third coating film that is transparent and covers the first coating film and the second coating film so as to be in contact with the second coating film and the portion of the first coating film that is not covered by the second coating film, Equipped with, The refractive index of the third coating film is 1.5210 or higher. The first coating film is A colored film that has been colored to a predetermined color, A transparent film is laminated on the side of the second coating film of the colored film, and is transparent with a glass transition temperature lower than that of the third coating film. Equipped with, The transparent film is in direct contact with the second coating film. Vehicle exterior parts.

Description

This invention relates to exterior parts for vehicles. Traditionally, exterior vehicle parts have included components adorned with emblems displaying the manufacturer's name and model name, as well as parts with stickers or decals. Such exterior parts require a high level of aesthetic appeal to enhance the vehicle's premium feel. Furthermore, these parts are exposed to sunlight, wind, rain, and chemicals (such as detergents used during car washing), thus requiring high durability. Patent Document 1 discloses a configuration in which characters and symbols are printed on the outer casing of a hot water unit using inkjet printing, and the surface is covered with a clear coating layer. Patent Document 2 discloses a configuration in which a design is applied to a building material using inkjet printing, and the surface of the building material is covered with a clear coating layer. Japanese Patent Publication No. 2019-100554Japanese Patent Publication No. 2014-226913 (Problems the invention aims to solve) Incidentally, if there are minute irregularities on the surface of the coating film that forms letters or other shapes, light is more easily scattered on that surface, which reduces the clarity of the letters or other shapes (i.e., the letters or other shapes appear blurry). For this reason, in order to improve the aesthetic appearance of exterior parts, it is desirable to improve the clarity of letters or other shapes. In particular, inkjet coating devices spray minute amounts of ink towards the object to be coated, so minute irregularities tend to occur on the surface of the printed letters or other shapes (i.e., the surface of the formed coating film). This invention was made in view of the above circumstances, and one of its objectives is to improve the aesthetic appearance (look) of exterior parts while ensuring the durability of the coating on the exterior parts of a vehicle. (Means for solving the problem) To achieve the above objective, the exterior parts of a vehicle according to the present invention are A vehicle exterior part comprising a base material and a multi-layer coating film covering the surface of the base material, The aforementioned multi-layer coating film is The first coating film closest to the substrate, A second coating film is in contact with the first coating film and covers a portion of the surface of the first coating film, A third coating film that is transparent and covers the first coating film and the second coating film so as to be in contact with the second coating film and the portion of the first coating film that is not covered by the second coating film, Equipped with, The refractive index of the third coating film is 1.5210 or higher. The substrate comprises a thermoplastic resin material that softens at temperatures exceeding 80°C. The glass transition temperatures of the first coating film and the second coating film are 80°C or lower. According to the present invention, by setting the refractive index of the third coating film to 1.5210 or higher, the amount of light reflected from the surface of the third coating film can be increased, while the amount of light incident from outside the multi-layer coating film to the interface between the third coating film and the second coating film (the surface of the second coating film) can be reduced. Therefore, even if minute irregularities exist on the surface of the second coating film, the amount of light diffusely reflected from that surface is reduced, resulting in a clearer appearance of the second coating film. In this way, by covering the first and second coating films with the third coating film, the durability, weather resistance, and chemical resistance of the first and second coating films can be ensured while improving the aesthetic appearance of the exterior parts. The substrate comprises a thermoplastic resin material that softens at temperatures exceeding 80°C. The glass transition temperatures of the first coating film and the second coating film are 80°C or lower. This configuration can be applied. With this configuration, by heating the vehicle's exterior parts to approximately 80°C to soften the first and second coatings, it is possible to prevent or suppress deformation of the substrate while improving the adhesion between the first and second coatings and the third coating. The glass transition temperature of the second coating is lower than that of the third coating. This configuration can be applied. With this configuration, by heating the vehicle's exterior parts to a temperature higher than the glass transition temperature of the second coating, the adhesion (bonding strength) between the second and third coatings can be improved. Therefore, peeling of the second coating from the third coating can be prevented or suppressed, thereby improving the durability of the second coating while preventing or suppressing deformation of the third coating. The glass transition temperature of the second coating