CN-116685644-B - Effect pigment having near infrared ray reflection function, paint and panel using the same

Abstract

Disclosed are a near infrared ray reflective functional pigment, a paint, and a panel, which are particularly useful for a paint for vehicles and the like. The pigment according to the present invention includes a platelet-shaped substrate, a first metal oxide layer coated on at least a portion of an upper portion of the substrate and having a refractive index of 1.8 or more, and a second metal oxide layer coated on at least a portion of an upper portion of the first metal oxide layer and including an absorptive material. And, the pigment reflects an IR electron beam of 850nm to 950nm on average of 30% or more.

Inventors

• XU DONGMIN
• ZHENG ZAIYI
• JIANG GUANGZHONG
• CUI BINGQI
• Lin Guangshui
• Chang Jiwan

Assignees

• CQV 株式会社

Dates

Publication Date

20260508

Application Date

20221121

Priority Date

20211216

Claims (8)

1. 1. A near infrared reflective functional effect pigment, comprising: A sheet-like base material; A first metal oxide layer coated on at least a part of the upper part of the substrate and having a refractive index of 1.8 or more, and A second metal oxide layer coated on at least a portion of the upper portion of the first metal oxide layer and including an absorptive material, And the pigment reflects an IR electron beam of 850nm to 950nm on average of 30% or more, The first metal oxide layer is composed of Fe 2 O 3 , The second metal oxide layer is composed of Co 3 O 4 , And the ratio of the content of Fe contained in the first metal oxide layer to the content of Co contained in the second metal oxide layer is in the range of 1:0.5 to 1:1, The pigment has a blackness of 35 or less.
2. 2. The near infrared ray reflection functional effect pigment of claim 1, wherein, The pigment reflects an average of less than 15% of the visible electron beam.
3. 3. The near infrared ray reflection functional effect pigment of claim 1, wherein, The platy substrate is made of more than one platy material selected from synthetic mica, natural mica, glass flakes, platy glass, platy ferric oxide, platy aluminum oxide, platy silicon dioxide, platy aluminum and platy TiO 2 .
4. 4. A near infrared reflective functional coating, comprising: Adhesive agent, and The near infrared reflective functional effect pigment of claim 1.
5. 5. The near infrared ray reflection functional coating according to claim 4, wherein, The pigment has a blackness of 35 or less, And the pigment reflects an average of 1% or less of visible electron beams of 400nm to 700 nm.
6. 6. The near infrared ray reflection functional coating according to claim 4, wherein, The platy substrate is made of more than one platy material selected from synthetic mica, natural mica, glass flakes, platy glass, platy ferric oxide, platy aluminum oxide, platy silicon dioxide, platy aluminum and platy TiO 2 .
7. 7. A panel coated with a near infrared ray reflection functional coating, wherein, The coating comprising a binder and the near infrared reflective functional effect pigment of claim 1.
8. 8. The panel of claim 7, wherein, The panel is applied to the outside of a vehicle.

Description

Effect pigment having near infrared ray reflection function, paint and panel using the same Technical Field The present invention relates to an effect pigment having a near infrared ray reflection function, and in particular, to the pigment and a paint using the same and a panel applied to a vehicle or the like. Background Effect pigments are used in a number of fields of industry, in particular in automobiles, decorative coatings, plastics, paints, printing inks and cosmetic compositions. In the above-mentioned various fields, effect pigments are used for vehicle paints such as automobiles in particular, and in addition to bright pigments such as pearl colors, pigments of a dark color series such as black are also used for vehicle paints. Recently, in the automotive industry, research into automatically drivable vehicles is actively underway. These automated driving automobiles use sensors such as cameras, ultrasonic waves, radar (Rader), and Lidar (Lidar) in order to identify peripheral elements, and promote expansion of automated driving based on the content identified by such systems. In this sensing technology, the recognition distance of the LiDAR system is relatively short compared to the Rader system, but it is characteristic to use a laser having a frequency of about 905nm as a light source as a three-dimensional recognition system having a resolution improved compared to the Rader system for the surrounding environment within an appropriate distance. However, the dark pigment used in the paint applied to a general dark vehicle has a characteristic that light in a visible light region perceived by naked eyes is absorbed based on general optical characteristics, and light in a near infrared region including a wavelength of 905nm used as a LiDAR light source is also absorbed together. Due to these light absorption characteristics, the recognition efficiency of vehicles painted with traditional dark colors by LiDAR sensors is significantly reduced, which has become a major obstacle to achieving automated driving at present. Disclosure of Invention Technical problem to be solved The object of the present invention is to provide a novel pigment for a dark color of a LiDAR system, wherein the pigment realizes a dark color by low reflectivity in the visible region and effectively reflects a LiDAR light source in the near infrared region by effectively reflecting the LiDAR light source, so that even the dark color pigment can effectively reflect the LiDAR light source. Means for solving the problems The near infrared ray reflection functional pigment according to an embodiment of the present invention for achieving the above object is characterized by comprising a sheet-shaped substrate, a first metal oxide layer coated on at least a portion of an upper portion of the substrate and having a refractive index of 1.8 or more, and a second metal oxide layer coated on at least a portion of an upper portion of the first metal oxide layer and comprising an absorptive material. And, the near infrared ray reflection functional pigment reflects an IR electron beam of 850nm to 950nm on average at least 30%. Preferably, the first metal oxide layer includes Fe 2O3, the second metal oxide layer includes Co 3O4, and a ratio of a content of Fe included in the first metal oxide layer to a content of Co included in the second metal oxide layer may be in a range of 1:0.5 to 1:1. Further, preferably, the first metal oxide layer contains TiO 2 and SnO 2, the second metal oxide layer contains CuO, and the ratio of the content of Ti and Sn contained in the first metal oxide layer to the content of Cu contained in the second metal oxide layer may be in the range of 1:4 to 1:6. More specifically, the pigment has a blackness (L) of 35 or less, and can reflect an average of 400nm to 700nm of visible electron beams of 15% or less. And, a coating material according to another embodiment of the present invention for achieving the above object includes a binder, and a near infrared ray reflection functional pigment, wherein the pigment includes a platy substrate, a first metal oxide layer coated on at least a portion of an upper portion of the substrate and having a refractive index of 1.8 or more, and a second metal oxide layer coated on at least a portion of an upper portion of the first metal oxide layer and including an absorptive material. And, the pigment reflects an IR electron beam of 850nm to 950nm on average of 30% or more. As described above, the pigment applied to the paint has a blackness (l×) of 35 or less and can reflect an average of 15% or less of visible electron beams of 400nm to 700 nm. The plate-like substrate may be one or more plate-like materials including synthetic mica, natural mica, glass flakes (GLASS FLAKE), plate-like glass, plate-like iron oxide, plate-like aluminum oxide, plate-like silica, plate-like aluminum, and plate-like TiO 2. And, a panel according to still another embodiment of the present inventi