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

Abstract

The present invention discloses a near-infrared reflective functional pigment, a paint, and a panel that are particularly used in vehicle paints and the like. The pigment according to the present invention comprises a platelet-shaped substrate, a first metal oxide layer having a refractive index of 1.8 or more coated on at least a portion of the top of the substrate, and a second metal oxide layer comprising an absorbing material coated on at least a portion of the top of the first metal oxide layer, and reflects an average of 30% or more of IR electron radiation in the range of 850 to 950 nm.

Description

Technical Field

[0001] The present invention relates to an effect pigment having a near-infrared reflection function, and more specifically, to the pigment, paints using the same, and panels applied to vehicles and the like.

Background Art

[0002] Effect pigments are used in various industrial fields, particularly in the fields of automobiles, decorative coatings, plastics, paints, printing inks, and cosmetic formulations.

[0003] Among the various fields described above, in particular, effect pigments are used in vehicle paints such as those for automobiles. Along with bright-colored pigments such as pearlescent colors, dark-colored pigments such as black are also used in vehicle paints.

[0004] In recent years, in the automotive industry, research on automobiles capable of autonomous driving has been actively promoted. For these autonomous driving automobiles, sensors such as cameras, ultrasonic sensors, radars, and lidars are used to recognize surrounding elements, and based on the information recognized through these systems, the scope of autonomous driving is being expanded. Among these sensing technologies, the LiDAR system, although having a relatively shorter recognition distance compared to the radar system, is a three-dimensional recognition system that has a higher resolution for the surrounding environment within an appropriate distance compared to the radar system. As a feature, it uses a laser having a frequency of about 905 nm as a light source.

[0005] However, dark-colored pigments used in paints applied to general dark-colored vehicles have the property of absorbing both visible light in the visible light region for visual recognition and light in the near-infrared region including the wavelength of 905 nanometers used as the LiDAR light source due to their general optical properties. Due to these light absorption properties, existing vehicles painted in dark colors have a significant drop in the recognition efficiency by LiDAR sensors, which is currently a major obstacle in realizing autonomous driving.

Summary of the Invention

Problems to be Solved by the Invention

[0006] An object of the present invention is to provide a novel dark-colored pigment for a LiDAR system that exhibits a dark hue due to a low reflectance in the visible light region, effectively reflects a LiDAR light source in the near-infrared region, and effectively reflects the LiDAR light source despite being a dark-colored pigment.

Means for Solving the Problems

[0007] To achieve the above object, a near-infrared reflective functional pigment according to an embodiment of the present invention includes a platelet-shaped substrate, a first metal oxide layer coated on at least a part of the 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 part of the upper portion of the first metal oxide layer and containing an absorbent material, and is characterized in that it reflects an IR electron beam of 850 to 950 nm by an average of 30% or more.

[0008] Preferably, the first metal oxide layer contains Fe2O3, the second metal oxide layer contains Co3O4, 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 can be in the range of 1:0.5 to 1:1.

[0009] Also preferably, the first metal oxide layer contains TiO2 and SnO2, 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 can be in the range of 1:4 to 1:6.

[0010] More specifically, the pigment has a blackness degree (L*) of 35 or less and can reflect a visible electron beam of 400 to 700 nm by an average of 15% or less.

[0011] Furthermore, in order to achieve the above object, a paint according to another embodiment of the present invention includes a binder and a near-infrared reflective functional pigment. The pigment includes a small plate-like substrate, and a first metal oxide layer coated on at least a part of the 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 part of the upper portion of the first metal oxide layer and containing an absorbent material. It is characterized in terms of structure that it reflects IR electron beams of 850 to 950 nm by an average of 30% or more.

[0012] As described above, the pigment applied to the paint has a blackness degree (L*) of 35 or less and can reflect visible electron beams of 400 to 700 nm by an average of 15% or less.

[0013] Also, the small plate-like substrate may be a plate-like material including one or more of synthetic mica, natural mica, glass flake, plate-like glass, plate-like iron oxide, plate-like alumina, plate-like silica, plate-like aluminum, and plate-like TiO2.

[0014] Furthermore, in order to achieve the above object, a panel according to still another embodiment of the present invention is a panel coated with a near-infrared reflective functional paint. The paint includes a binder and a near-infrared reflective functional pigment. The pigment includes a small plate-like substrate, and a first metal oxide layer coated on at least a part of the 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 part of the upper portion of the first metal oxide layer and containing an absorbent material. It reflects IR electron beams of 850 to 950 nm by an average of 30% or more, and the panel is characterized in terms of structure that it is detectable by LiDAR (Light Detection and Ranging).

Effects of the Invention

[0015] The near-infrared reflective functional pigment according to the present invention reflects an average of 30% or more of the IR electron beam in the range of 850 to 950 nm, preferably, the reflectance at 905 nm, which is the frequency of the LiDAR sensor, is 30% or more, and has the effect of being detectable by LiDAR (Light Detection and Ranging).

[0016] In particular, even in the case of a dark color with a blackness degree (L*) of 35 or less, the pigment according to the present invention can reflect an average of 30% or more of the IR electron beam in the range of 850 to 950 nm and an average of 15% or less of the visible electron beam in the range of 400 to 700 nm, and has the effect of being detectable by LiDAR (Light Detection and Ranging).

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0018] The advantages and features of the present invention, and the methods for achieving them, will become clear by referring to the examples and drawings described in detail below.

[0019] However, the present invention is not limited to the embodiments disclosed below, and can be embodied in various different forms. However, this embodiment is provided to complete the disclosure of the present invention and to fully inform those with ordinary knowledge in the technical field to which the present invention pertains of the scope of the invention, and the present invention is only defined by the scope of the claims.

[0020] Hereinafter, the functional pigments, paints, and panels according to the embodiments of the present invention will be described in detail.

[0021] [Near-infrared reflective functional pigment] Referring to FIG. 1, the near-infrared reflective functional pigment 100 of the present invention includes a small plate-like substrate 10, a first metal oxide layer 20 coated on at least a part of the upper portion of the substrate 10 and having a refractive index of 1.8 or more, and a second metal oxide layer 30 coated on at least a part of the upper portion of the first metal oxide layer 20 and containing an absorbent material, and reflects an IR electron beam of 850 to 950 nm by an average of 30% or more.

[0022] The near-infrared rays in the present invention mean an IR electron beam having a wavelength between 850 and 950 nm. The average reflectance means the arithmetic average value of the reflectances for an IR electron beam in a certain range.

[0023] Thus, the present invention relates to a pigment 100 that reflects near-infrared rays by an average of 30% or more, and most preferably has a reflectance of 30% or more at 905 nm, which is the frequency of the LiDAR sensor.

[0024] The small plate-like substrate 10 used in the pigment 100 of the present invention is not particularly limited in its type, and a plate-like material including one or more of synthetic mica, natural mica, glass flake, plate-like glass, plate-like iron oxide, plate-like alumina, plate-like silica, plate-like aluminum, and plate-like TiO2 can be used.

[0025] Next, in the pigment 100 of the present invention, a first metal oxide layer 20 is coated on at least a part of the upper portion of the small plate-like substrate 10, and the first metal oxide layer 20 has a refractive index of 1.8 or more.

[0026] Here, the meaning that the first metal oxide layer 20 is coated on at least a part of the upper portion of the small plate-shaped substrate 10 means that the first metal oxide layer 20 may be coated on the entire upper portion of the small plate-shaped substrate 10, or the first metal oxide layer 20 may be coated only on at least a part of the upper portion of the small plate-shaped substrate 10, or the first metal oxide layer 20 may be coated in an island shape on the upper portion of the small plate-shaped substrate 10.

[0027] The first metal oxide layer 20 functions to improve the light reflection efficiency of visible light and near-infrared light with respect to the small plate-shaped substrate 10 and to impart stability in the manufacturing process of the pigment 100.

[0028] The metal oxide contained in the first metal oxide layer 20 can be used without limitation as long as it is a substance having a high refractive index of 1.8 or more. Preferably, the first metal oxide layer can contain one or more of Fe2O3, SnO2, and TiO2. More specifically, the first metal oxide layer 20 can contain one of Fe2O3, SnO2, and TiO2 alone, or can contain a mixture of two or more.

[0029] Next, in the pigment 100 of the present invention, a second metal oxide layer 30 is coated on the upper portion of the first metal oxide layer 20, and the second metal oxide layer 30 contains an absorbent material.

[0030] Here, the meaning that the second metal oxide layer 30 is coated on at least a part of the upper portion of the first metal oxide layer 20 means that the second metal oxide layer 30 may be coated on the entire upper portion of the first metal oxide layer 20, or the second metal oxide layer 30 may be coated only on at least a part of the upper portion of the first metal oxide layer 20, or the second metal oxide layer 30 may be coated in an island shape on the upper portion of the first metal oxide layer 2.

[0031] The absorbent material means a material that absorbs visible light. In particular, in the present invention, it means a material in which the pigment acts so as to have a dark color.

[0032] The dark color in the present invention means a dark color with a blackness degree (L*) of 35 or less. Thus, the pigment according to the present invention contains an absorbent material and has a dark color.

[0033] The absorbent material used in the present invention is not limited as long as it is a material that makes the pigment have a dark color as described above. Preferably, the absorbent material can contain one or more of Co3O4 and CuO.

[0034] According to an embodiment of the present invention, the first metal oxide layer contains Fe2O3, the second metal oxide layer contains Co3O4, 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 preferably has a range of 1:0.5 to 1:1.

[0035] In the content ratio of the components, when the content of Fe contained in the first metal oxide layer 20 is 1, if the content of Co contained in the second metal oxide layer 30 is less than 0.5, there is a problem that the blackness degree (L*) of the pigment decreases and the pigment has a red or dark red color.

[0036] Conversely, in the component ratio, when the content of Fe contained in the first metal oxide layer 20 is 1, if the content of Co contained in the second metal oxide layer 30 exceeds 1, there is a problem that the near-infrared reflection characteristic of the pigment decreases and the LiDAR reflection characteristic does not appear.

[0037] In other words, when the first metal oxide layer 20 contains Fe2O3 and the second metal oxide layer 30 contains Co3O4, considering the characteristics of Fe and Co, the content ratio of Fe contained in the first metal oxide layer 20 to Co contained in the second metal oxide layer 30 preferably satisfies a range of 1:0.5 to 1:1.

[0038] According to another embodiment of the present invention, the first metal oxide layer 20 contains TiO2 and SnO2, the second metal oxide layer 30 contains CuO, and the ratio of the contents of Ti and Sn contained in the first metal oxide layer 20 to the content of Cu contained in the second metal oxide layer 30 preferably has a range of 1:4 to 1:6.

[0039] In the content ratio of the above components, when the contents of Ti and Sn contained in the first metal oxide layer 20 are 1, if the content of Cu contained in the second metal oxide layer 30 is less than 4, there is a problem that it is difficult to exhibit a dark color of the pigment due to an increase in blackness (L*).

[0040] Conversely, in the above component ratio, when the contents of Ti and Sn contained in the first metal oxide layer 20 are 1, if the content of Cu contained in the second metal oxide layer 30 exceeds 6, there is a problem that the near-infrared reflection characteristics of the pigment decrease, resulting in the failure to exhibit LiDAR reflection characteristics.

[0041] In summary, when the first metal oxide layer 20 contains TiO2 and SnO2 and the second metal oxide layer 30 contains CuO, considering the characteristics of Ti, Sn, and Cu, the ratio of the contents of Ti and Sn contained in the first metal oxide layer 20 to the content of Cu contained in the second metal oxide layer 30 preferably satisfies a range of 1:4 to 1:6.

[0042] Furthermore, preferably, the near-infrared reflective functional pigment 100 of the present invention has a blackness (L*) of 35 or less and can reflect an average of 15% or less of visible electron beams.

[0043] Here, the average reflectance means the arithmetic mean value of the reflectances for visible electron beams in a certain range.

[0044] In this way, the pigment of the present invention has a relatively low blackness (L*) and can exhibit the effect of highly reflecting near-infrared rays as described above.

[0045] As mentioned above, the pigment 100 of the present invention has a dark color and reflects an average of 30% or more of the IR electron beam of 850 to 950 nm, preferably, the reflectance at 905 nm, which is the frequency of the LiDAR sensor, is 30% or more, and has the effect of being detectable by LiDAR.

[0046] [Near-infrared reflective functional paint] Next, the near-infrared reflective functional paint according to the present invention to which the above-described pigment is applied will be described.

[0047] The paint according to the present invention includes a binder and a near-infrared reflective functional pigment. The pigment includes a small plate-like substrate, a first metal oxide layer coated on at least a part of the 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 part of the upper portion of the first metal oxide layer and containing an absorbent material, and reflects an average of 30% or more of the IR electron beam of 850 to 950 nm.

[0048] As the binder, a known paint binder can be used. Examples include an enamel paint binder, a urethane paint binder, and a composite enamel-urethane paint binder.

[0049] Furthermore, as described above, the near-infrared reflective functional pigment has a dark color and reflects an average of 30% or more of the IR electron beam of 850 to 950 nm, preferably, the reflectance at 905 nm, which is the frequency of the LiDAR sensor, is 30% or more, and has the effect of being detectable by LiDAR.

[0050] [Panel] Next, the panel according to the present invention to which the above-described paint is applied will be described.

[0051] The panel according to the present invention is a panel coated with a near-infrared reflective functional paint, the paint comprising a binder and a near-infrared reflective functional pigment, the pigment comprising a small plate-like substrate, 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 part of the upper part of the first metal oxide layer and containing an absorbent material, reflecting an average of 30% or more of IR electron beams of 850 to 950 nm, and the panel being detectable by LiDAR (Light Detection and Ranging).

[0052] As described above, the near-infrared reflective functional pigment has a dark color and reflects an average of 30% or more of IR electron beams of 850 to 950 nm, preferably having a reflectance of 30% or more at 905 nm which is the frequency of the LiDAR sensor. By coating the paint applied with the pigment, the panel of the present invention is detectable by LiDAR (Light Detection and Ranging) even though the surface is coated with a dark color.

[0053] In particular, the panel of the present invention can be applied to the outside of a vehicle. Accordingly, the pigment, paint and panel of the present invention can be suitably used in an autonomous driving system.

[0054] [Examples] Hereinafter, the configuration and operation of the present invention will be further described in detail by preferred examples of the present invention. However, this is presented as a preferred exemplification of the present invention and should not be construed as limiting the present invention in any way.

[0055] Contents not described herein can be technically analogized sufficiently by those skilled in the art, so the description thereof will be omitted.

[0056] 1. Example 1 100 g of a small plate-like substrate (synthetic mica) was dispersed in water to about 9% and heated to a temperature between 70 and 80 °C. An iron salt diluting solution was added dropwise to the dispersed substrate in the heated state together with a counterion so that pH 2.5 to 3.5 was maintained. At this time, the coating amount of the iron salt was about 33 to 43% based on iron oxide, and coating was performed within the above range until the pigment exhibited a desired hue. Thereafter, a cobalt salt diluting solution was added dropwise together with a counterion so that the pH was between 8.0 and 9.5, which is a basic condition. At this time, the amount of cobalt coated was adjusted to about 25 to 35% based on the oxide to obtain a pigment having a desired hue. To obtain a pigment from the reaction solution, the reaction solution was washed with water, dehydrated, and then heat-treated at 800 °C.

[0057] In the pigment according to Example 1 produced as described above, Fe2O3 is coated on the upper part of the small plate-like substrate (synthetic mica), and Co3O4 is coated on the upper part of the Fe2O3.

[0058] Also, in the pigment according to Example 1, the content of Fe in the total pigment is 30.70%, and the content of Co is 24.20%.

[0059] 2. Example 2 100 g of a small plate-like substrate (plate-like alumina) was dispersed in water to about 9% and heated to a temperature between 70 and 80 °C. A diluting solution of a tin salt and a titanium salt was added dropwise to the dispersed substrate in the heated state together with a counterion so that pH 1.0 to 2.0 was maintained. At this time, the coating amounts of the tin salt and the titanium salt were added dropwise so that the tin oxide was about more than 0 to 3% and the titanium dioxide was 5 to 10% based on the oxide so that the pigment exhibited a desired hue. Thereafter, a copper salt diluting solution was added dropwise together with a counterion so that the pH was neutral and between 7.0 and 9.0, which is a basic condition, for coating. At this time, the amount of copper oxide coated was coated within about 20 to 40% based on copper oxide so that the pigment exhibited a desired hue. To obtain a pigment from the reaction solution, the reaction solution was washed with water, dehydrated, and then heat-treated at 800 °C.

[0060] The pigment according to Example 2 manufactured as described above has a mixture of TiO2 and SnO2 coated on the upper part of a small plate-like substrate (plate-like alumina), and CuO coated on the upper part of the mixture layer.

[0061] Also, in the pigment according to Example 2, the content of Ti in the whole pigment is 5.46%, the content of Sn is 0.64%, and the content of Cu is 28.60%.

[0062] 3. Comparative Example 1 Disperse 100 g of a small plate-like substrate (synthetic mica) in water to about 9% and heat it to a temperature between 70 and 80 °C. While maintaining the pH of the heated dispersed substrate at 2.5 to 3.5, add a diluted iron salt solution dropwise together with a counter ion. At this time, the coating amount of the iron salt was coated by about 25 to 35% based on iron oxide, and the coating was performed within the above range until the desired hue was developed. Then, a diluted cobalt salt solution was added dropwise together with a counter ion so that the pH was between 8.0 and 9.5, which is a basic condition, and the coating was performed. At this time, the coated cobalt amount was coated to be about 15 to 25% based on the oxide so that the pigment developed the desired hue. Further, in order to form copper oxide, which is an NIR reflection layer, a copper salt was added to the final pigment, and a diluted copper salt solution was added dropwise together with a counter ion so that the amount of copper oxide was about 20 to 30% and the pH was neutral and between 7.0 and 9.0, which is a basic condition, and the coating was performed. After washing and dehydrating the reaction solution with water, it was heat-treated at 800 °C.

[0063] The pigment manufactured as described above Comparative Example 1 has Fe2O3 coated on the upper part of a small plate-like substrate (synthetic mica), Co3O4 coated on the upper part of the Fe2O3, and CuO coated on the upper part of the Co3O4.

[0064] [Physical Property Evaluation of Examples] 1. Observation of Pigment Surface The surface of the near-infrared reflective functional pigment manufactured by the method described above was observed with a scanning electron microscope. Examples 1 to 2The surfaces of the pigments according to [reference] are shown in FIGS. 2 to 4, respectively.

[0065] Referring to FIG. 2, an SEM photograph of the pigment according to Example 1 is shown.

[0066] Also, referring to FIG. 3, an SEM photograph of the pigment according to Example 2 is shown, and it can be confirmed that the CuO is coated in an island shape.

[0067] Furthermore, referring to FIG. 4, an SEM photograph of the pigment according to Example 2 is shown.

[0068] As described above, referring to FIGS. 2 to 4, it can be confirmed that metal oxides are coated on the upper part of the small plate-like substrate.

[0069] 2. Analysis of Reflectance, Lightness, and Chroma Example and Comparative Example The reflectance, lightness, and chroma of the pigments according to [reference] were analyzed.

[0070] The wavelength-dependent reflectance of the pigment was measured using a UV-Vis spectrophotometer with barium sulfate as a reference substance after mixing the pigment at a concentration of 12% using a transparent acrylic resin, forming a coating film with a wet thickness of 150 μm on an OHP film, and drying it sufficiently at room temperature.

[0071] The lightness and chroma were measured at 25° using a color difference meter after mixing the pigment at a concentration of 6% using a transparent acrylic resin, forming a coating film with a thickness of 100 μm on an opacity chart, and drying it sufficiently at room temperature.

[0072] Example and Comparative Example The wavelength-dependent reflectance of the pigment of each example is shown in FIG. 5. Also, the result values of the 905 nm reflectance, lightness, and chroma of the pigment of each example are shown in Table 1 below. and Comparative Example

[0073]

Table 1

[0074] Referring to FIG. 5 and Table 1, it can be confirmed that the pigments of Examples 1 and 2 both exhibit an average reflectance of 30% or more with respect to near-infrared rays having a wavelength of 850 to 950 nm.

[0075] In particular, at a wavelength of 905 nm, Example 1 exhibits a reflectance of 35% and Example 2 exhibits a reflectance of 43%, confirming that they can be used as pigments detectable by LiDAR.

[0076] Furthermore, it can be seen that the pigments of Examples 1 and 2 have an average reflectance of 15% or less in the visible light wavelength band region (400 to 700 nm).

[0077] Moreover, referring to Table 1 and FIG. 4 and looking at the measurement results regarding lightness, both Examples 1 and 2 correspond to an L* value of 35 or less.

[0078] However, Comparative Example 1 although it was coated using both Co and Cu, it was shown that the near-infrared reflectance at a wavelength of 905 nm was less than 30%.

[0079] Taking this all together, it can be confirmed that even if a pigment is produced using a component that exhibits a dark color and a component that reflects near-infrared rays, it does not necessarily exhibit a reflectance of 30% or more with respect to near-infrared rays of 905 nm.

[0080] In order to have a dark color and reflect a certain ratio or more of near-infrared rays of 905 nm, it can be confirmed that the number of coating layers coated on the upper part of the small plate-like substrate, the selection of components, and the component ratio constituting each coating layer act as important factors.

[0081] Thus, it can be seen that the pigment according to the present invention can be used as a pigment detectable by LiDAR by having a dark color and exhibiting a reflectance of 30% or more with respect to near-infrared rays.

[0082] In the above, the embodiments of the present invention have been described with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and can be changed into various different forms. Those having ordinary knowledge in the technical field to which the present invention pertains can understand that it can be implemented in other specific forms without changing the technical idea and essential features of the present invention. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive.

Claims

1. A small plate-shaped substrate; A first metal oxide layer coated on at least a part of the 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 part of the upper portion of the first metal oxide layer and containing an absorbent material that absorbs visible light and contains one or more of Co 3 O 4 and CuO; consisting only of, The first metal oxide layer contains Fe ２ O ３ and The second metal oxide layer contains Co ３ O ４ and The mass ratio of Fe contained in the first metal oxide layer to Co contained in the second metal oxide layer is in the range of 1:0.5 to 1:1, Reflecting an average of 30% or more of IR electromagnetic waves of 850 to 950 nm, Near-infrared reflective functional effect pigment.

2. A small plate-shaped substrate; A first metal oxide layer coated on at least a part of the 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 part of the upper portion of the first metal oxide layer and containing an absorbent material that absorbs visible light and contains one or more of Co 3 O 4 and CuO; consisting only of, The first metal oxide layer contains TiO ２ and SnO ２ and The second metal oxide layer contains CuO, The mass ratio of the sum of Ti and Sn contained in the first metal oxide layer to Cu contained in the second metal oxide layer is in the range of 1:4 to 1:6, Reflecting an average of 30% or more of IR electromagnetic waves of 850 to 950 nm, Near-infrared reflective functional effect pigment.

3. The blackness (L*) is 35 or less, Reflecting an average of 15% or less of visible electromagnetic waves, The near-infrared reflective functional effect pigment according to Claim 1 or 2.

4. The small plate-shaped substrate is, Synthetic mica, natural mica, glass flake, plate-shaped glass, plate-shaped iron oxide, plate-shaped alumina, plate-shaped silica, plate-shaped aluminum, and plate-shaped TiO ２ a plate-shaped material containing one or more of The near-infrared reflective functional effect pigment according to Claim 1 or 2.

5. A binder; and, A near-infrared reflective functional pigment; comprising, The pigment is, A small plate-shaped substrate, A first metal oxide layer coated on at least a part of the upper portion of the substrate and having a refractive index of 1.8 or more, A second metal oxide layer coated on at least a part of the upper portion of the first metal oxide layer and containing an absorbent material that absorbs visible light and contains one or more of Co 3 O 4 and CuO; consisting only of, The first metal oxide layer contains Fe ２ O ３ and The second metal oxide layer contains Co ３ O ４ and The mass ratio of Fe contained in the first metal oxide layer to Co contained in the second metal oxide layer is in the range of 1:0.5 to 1:1, Reflecting an average of 30% or more of IR electromagnetic waves of 850 to 950 nm, Near-infrared reflective functional paint.

6. A binder; and, A near-infrared reflective functional pigment; comprising, The pigment is, A small plate-shaped substrate, Coated on at least a part of the upper portion of the substrate, a first metal oxide layer having a refractive index of 1.8 or more, and Coated on at least a part of the upper portion of the first metal oxide layer, a second metal oxide layer including an absorbent material that absorbs visible light and contains one or more of Co 3 O 4 and CuO, consisting only of The first metal oxide layer contains TiO ２ and SnO ２ and The second metal oxide layer contains CuO. The mass ratio of the sum of Ti and Sn contained in the first metal oxide layer to Cu contained in the second metal oxide layer is in the range of 1:4 to 1:

6. Reflects an average of 30% or more of IR electromagnetic waves of 850 to 950 nm. Near-infrared reflective functional paint.

7. The blackness (L*) is 35 or less, Reflects an average of 1% or less of visible electromagnetic waves of 400 to 700 nm. The near-infrared reflective functional paint according to claim 5 or 6.

8. The small plate-shaped substrate is Synthetic mica, natural mica, glass flake, plate glass, plate iron oxide, plate alumina, plate silica, plate aluminum, and plate TiO ２ A plate-shaped material containing one or more of the above The near-infrared reflective functional paint according to claim 5 or 6.

9. A panel coated with a near-infrared reflective functional paint, The paint includes a binder and a near-infrared reflective functional pigment. The pigment is A small plate-shaped substrate, Coated on the upper portion of the substrate, a first metal oxide layer having a refractive index of 1.8 or more, and Coated on the upper portion of the first metal oxide layer, a second metal oxide layer including an absorbent material that absorbs visible light and contains one or more of Co 3 O 4 and CuO, consisting only of The first metal oxide layer contains Fe ２ O ３ and The second metal oxide layer contains Co ３ O ４ and The mass ratio of Fe contained in the first metal oxide layer to Co contained in the second metal oxide layer is in the range of 1:0.5 to 1:

1. Reflects an average of 30% or more of IR electromagnetic waves of 850 to 950 nm. The panel is detectable by LiDAR (Light Detection and Ranging). Panel.

10. A panel coated with a near-infrared reflective functional paint, The paint includes a binder and a near-infrared reflective functional pigment. The pigment is A small plate-shaped substrate, Coated on the upper portion of the substrate, a first metal oxide layer having a refractive index of 1.8 or more, and Coated on the upper portion of the first metal oxide layer, a second metal oxide layer including an absorbent material that absorbs visible light and contains one or more of Co 3 O 4 and CuO, consisting only of The first metal oxide layer contains TiO ２ and SnO ２ and The second metal oxide layer contains CuO. The mass ratio of the sum of Ti and Sn contained in the first metal oxide layer to Cu contained in the second metal oxide layer is in the range of 1: reflecting an average of 30% or more of IR electromagnetic waves of 850 to 950 nm, said panel being detectable by LiDAR (Light Detection and Ranging), panel.

11. said panel is applied to the outside of a vehicle, panel according to claim 9 or 10.

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