Heat-shielding film, heat-shielding coating material, and coated article

Abstract

To provide a heat-shielding film which has high visible light transmittance and high heat-shielding property.SOLUTION: A heat-shielding film has transmittance of light at a wavelength of 300 nm or more and 800 nm or less of 50% or more, and contains (i) particles, and (ii) a resin component, wherein either or both of the particles and the resin component has an abnormal dispersible refractive index to light at a wavelength of 500 nm or more and 1,000 nm or less, and a difference in the refractive index of light at a wavelength of 500 nm between the particles and the resin component is smaller than a difference in the refractive index of light at a wavelength of 1,000 nm between the particles and the resin component.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a heat insulating film, a heat insulating paint, and a coated article. [Background technology]

[0002] A heat-shielding film is a film that has a function of suppressing a rise in temperature of a component due to sunlight when used outdoors. The heat-shielding film has heat-shielding properties because it absorbs or reflects infrared light contained in sunlight.

[0003] Among them, a heat-shielding film that reflects infrared light is particularly preferable because it has high heat-shielding properties. A heat-shielding film that reflects infrared light contains a material that reflects infrared light. Examples of materials that reflect infrared light include titanium dioxide, calcium carbonate, and zinc oxide. For example, Patent Document 1 proposes that a heat-shielding paint used to form a heat-shielding coating film contains titanium dioxide having a specific median diameter.

[0004] On the other hand, there is a strong demand for improving the visible light transmittance of heat shielding films. For example, Patent Document 2 proposes a highly light-transmitting film material that is a multilayer structure having a heat shielding resin layer and one or more heat retaining resin layers, and has an overall visible light transmittance of 10 to 50%. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-147571 A [Patent Document 2] JP 2016-16545 A Summary of the Invention [Problem to be solved by the invention]

[0006] Although further improvement in the visible light transmittance of heat-shielding films is required, the heat-shielding properties and visible light transmittance of heat-shielding films are often in a trade-off relationship, and it has been difficult to achieve both heat-shielding properties and visible light transmittance of heat-shielding films. For example, if the content of titanium dioxide, which is a material that reflects infrared light, in the heat-shielding film is reduced in order to increase the visible light transmittance of the heat-shielding film, the infrared light becomes less likely to be reflected, and the heat-shielding properties decrease.

[0007] Therefore, an object of the present invention is to provide a heat-shielding film having high visible light transmittance and high heat-shielding properties. Another object of the present invention is to provide a heat-shielding paint used for forming the heat-shielding film, and a coated article having the heat-shielding film. [Means for solving the problem]

[0008] That is, according to one aspect of the present invention, there is provided a heat shielding film having a transmittance of 50% or more for light having a wavelength of 300 nm or more and 800 nm or less, (i) particles; and (ii) a resin component; one or both of the particles and the resin component has an anomalous dispersion refractive index for light having a wavelength of 500 nm or more and 1000 nm or less, There is provided a heat shielding film, characterized in that the difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is smaller than the difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm.

[0009] According to another aspect of the present invention, the transmittance of light having a wavelength of 300 nm or more and 800 nm or less is 50% or more, The transmittance of light with a wavelength of 500 nm is 70% or more, The reflectance of light with a wavelength of 1000 nm is 30% or more. The present invention provides a heat shielding film comprising: Effect of the Invention

[0010] According to the present invention, it is possible to provide a heat-shielding film having high visible light transmittance and high heat-shielding properties. Also, according to the present invention, it is possible to provide a heat-shielding paint used for forming the heat-shielding film, and a coated article having the heat-shielding film. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The present invention will be described in more detail below with reference to preferred embodiments. In the present invention, the term "anomalous dispersion refractive index" refers to a refractive index in which the refractive index on the long wavelength side (infrared light region) is greater than the refractive index on the short wavelength side (visible light region) in the relationship between the refractive index and the wavelength. In contrast, the term "normal dispersion refractive index" refers to a refractive index that decreases with increasing wavelength. In this specification, "having an anomalous dispersion refractive index for light with a wavelength of 500 nm or more and 1000 nm or less" may be simply described as "having an anomalous dispersion refractive index".

[0012] The present inventors have conducted extensive research to solve the above problems, and as a result have found that in order to control the reflection of light on the surfaces of particles contained in a heat-shielding film, it is important to adjust the difference in refractive index between the particles contained in the heat-shielding film and the resin component present around them, and have arrived at the present invention.

[0013] In the first aspect of the present invention, the transmittance of the heat shielding film for light with a wavelength of 300 nm to 800 nm is 50% or more, and the relationship between the difference in refractive index for light with a specific wavelength between the particles and the resin component contained in the heat shielding film is specified. Specifically, the difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is adjusted to be smaller than the difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm. In this way, the light with a wavelength of 1000 nm, which has particularly strong light energy in the infrared light region of sunlight, is easily reflected because the difference in refractive index between the particles and the resin component contained in the heat shielding film is large. On the other hand, the light with a wavelength of 500 nm, which has particularly strong light energy in the visible light region of sunlight, is difficult to reflect because the difference in refractive index between the particles and the resin component contained in the heat shielding film is small. In this way, by controlling the reflection of light according to the wavelength, it is possible to achieve both visible light transmittance and heat shielding properties. Furthermore, the present inventors have found that in order to obtain a heat shielding film having such light reflection characteristics, it is important that either one or both of the particles and the resin component contained in the heat shielding film have a refractive index with anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less. This makes it possible to make the difference in refractive index between the particles and the resin component in the visible light region smaller than the difference in refractive index in the infrared light region, and as a result, it is possible to achieve both visible light transmittance and heat shielding properties. Here, the difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is preferably 0 or more and 0.10 or less. In addition, the difference in refractive index between the resin and the resin component for light with a wavelength of 1000 nm is preferably 0.20 or more.

[0014] In a second embodiment of the present invention, the heat shielding film has a transmittance of 50% or more for light with a wavelength of 300 nm or more and 800 nm or less, a transmittance of 70% or more for light with a wavelength of 500 nm, and a reflectance of 30% or more for light with a wavelength of 1000 nm. By using such a heat shielding film, light with a wavelength of 500 nm, which has particularly strong light energy in the visible light region of sunlight, can be easily transmitted, and light with a wavelength of 1000 nm, which has particularly strong light energy in the infrared light region of sunlight, can be easily reflected. As a result, a heat shielding film can be obtained that can achieve both visible light transmittance and heat shielding properties.

[0015] <First embodiment> The thermal barrier film, paint, and coated article according to the first aspect will be described below. However, the present invention is not limited to the following embodiments.

[0016] [Heat shielding film] The heat shielding film in the first embodiment has a transmittance of 50% or more for light with a wavelength of 300 nm or more and 800 nm or less. This allows light in the visible light region with a wavelength of 300 nm or more and 800 nm or less to pass through, so the heat shielding film can have high visible light transmittance. In order to have higher visible light transmittance, the heat shielding film preferably has a transmittance of 60% or more for light with a wavelength of 300 nm or more and 800 nm or less, and more preferably has a transmittance of 70% or more. There is no particular upper limit for the transmittance of light with a wavelength of 300 nm or more and 800 nm or less, but it is preferably, for example, 100% or less.

[0017] The heat shielding film contains (i) particles and (ii) a resin component. Either or both of the particles and the resin component have an anomalous dispersion refractive index for light with a wavelength of 500 nm to 1000 nm. There is no particular restriction on the method for making the particles and the resin component have an anomalous dispersion refractive index for light with a wavelength of 500 nm to 1000 nm. In addition, the particles or resin component having an anomalous dispersion refractive index for light with a wavelength of 500 nm to 1000 nm preferably have a refractive index of 1.60 to 2.10 for light with a wavelength of 500 nm, and a refractive index of 1.50 to 1.70 for light with a wavelength of 1000 nm. In addition, the difference between the refractive index of the particles or resin component having an anomalous dispersion refractive index for light with a wavelength of 500 nm to 1000 nm and the refractive index of the light with a wavelength of 500 nm and the refractive index of the light with a wavelength of 1000 nm is preferably 0.10 or more. In addition, there is no particular restriction on the upper limit of this refractive index difference, but it can be, for example, 0.50 or less.

[0018] From the viewpoint of heat insulation, the thickness of the heat shielding film is preferably 1 μm or more, and more preferably 5 μm or more, and from the viewpoint of visible light transmittance, the thickness is preferably 1000 μm or less, and more preferably 200 μm or less.

[0019] (particle) There are no particular limitations on the particles, so long as they can be adjusted so that the transmittance of the heat insulating film for light having a wavelength of 300 nm or more and 800 nm or less is 50% or more. Examples of the particles include calcium carbonate, alumina, zinc oxide, yttrium oxide (Y 2 O 3 ), and diamond. In order to efficiently reflect infrared light, the particles are preferably dispersed in the resin component. From the viewpoint of achieving both heat insulation and visible light transmittance, the average particle diameter of the particles is preferably 0.2 μm or more and 5.0 μm or less, more preferably 0.3 μm or more and 5.0 μm or less, and even more preferably 1.0 μm or more and 5.0 μm or less. The average particle diameter of the particles is the cumulative 50% particle diameter (D 50 This "volume-based cumulative 50% particle size (D 50 )" is the diameter of a particle that is 50% of the total volume of the measured particles in a particle diameter cumulative curve, calculated from the small particle diameter side, and can be measured using a particle size distribution measuring device using a dynamic light scattering method. Measurement conditions include, for example, SetZero: 30 seconds, number of measurements: 3 times, measurement time: 180 seconds, shape: non-spherical, and refractive index: 2.60. In addition, a particle size analyzer using a dynamic light scattering method (for example, the product name "UPA-EX150", manufactured by Nikkiso) can be used as the particle size distribution measuring device. Of course, the particle size distribution measuring device and measurement conditions used are not limited to those described above. Furthermore, from the viewpoint of visible light transmittance, the refractive index of the particles in light with a wavelength of 500 nm is preferably 1.60 or more and 2.00 or less. In addition, since the particles have a refractive index of anomalous dispersion, the particles may contain an anomalous dispersion material described in the resin component column described later.

[0020] (Resin component) There are no particular limitations on the resin component, so long as it can be adjusted so that the transmittance of the heat shielding film for light with a wavelength of 300 nm or more and 800 nm or less is 50% or more. In this embodiment, when the resin component does not have a refractive index with anomalous dispersion, the resin component is composed of a resin that does not have anomalous dispersion. On the other hand, when the resin component has a refractive index with anomalous dispersion, the resin component is composed of a resin with a refractive index with anomalous dispersion, or a resin and an anomalous dispersion material with a refractive index with anomalous dispersion.

[0021] Examples of the resin include polystyrene, polyethylene, polypropylene, polyester, and polycarbonate. When a resin having an anomalous dispersion refractive index for light having a wavelength of 500 nm or more and 1000 nm or less is used as the resin, the resin preferably has a peak in a wavelength range of 300 nm or more and 500 nm or less in the spectral absorption spectrum, and more preferably has a peak in a wavelength range of 300 nm or more and 400 nm or less. In order for the resin to have an anomalous dispersion refractive index, the resin preferably has a unit having a benzotriazole skeleton, a unit having a triazine skeleton, or a unit having a benzophenone skeleton.

[0022] In addition, from the viewpoint of ease of adjusting the refractive index of anomalous dispersion, the resin component preferably contains a resin and an anomalous dispersion material having a refractive index of anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less. As the resin contained in this resin component, those listed in the above (Resin) section can be used, but since the refractive index can be controlled by the anomalous dispersion material, it is preferable to use a resin that does not have a refractive index of anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less.

[0023] The anomalous dispersion material preferably has a peak in the wavelength region of 300 nm to 500 nm in the spectral absorption spectrum, and more preferably has a peak in the wavelength region of 300 nm to 400 nm. Examples of the anomalous dispersion material include organic compounds having aromatic groups or heterocyclic groups. Examples of products that can be used as the anomalous dispersion material include ultraviolet absorbers such as ADK STAB LA-24, ADK STAB LA-29, and ADK STAB LA-F70 manufactured by ADEKA CORPORATION, and yellow dyes such as Solvent Yellow 162 (SY162). Examples of the anomalous dispersion material include inorganic particles such as titanium oxide, iron oxide, composite particles of iron oxide and silica, and composite particles of iron oxide and alumina. Examples of the composite particles of iron oxide and silica include H-type magadiite encapsulating molecular iron oxide described in JP 2022-33391 A. Among these, the anomalous dispersion material is preferably at least one selected from the group consisting of iron oxide, composite particles of iron oxide and silica, and composite particles of iron oxide and alumina. When the anomalous dispersion material is inorganic particles, the average particle size of the inorganic particles is preferably 10 nm or more and 200 nm or less, and more preferably 40 nm or more and 100 nm or less. The average particle size of the inorganic particles of this anomalous dispersion material is the cumulative 50% particle size on a volume basis (D 50 This "volume-based cumulative 50% particle size (D 50 ) can be measured in the same manner as described in the section on particles.

[0024] When the resin component contains an anomalous dispersion material, the content of the anomalous dispersion material in the resin component is preferably 10% by volume or more and 70% by volume or less based on the content of the resin in the resin composition. By setting the content of the anomalous dispersion material in the above range, the heat insulation property and visible light transmittance can be further improved.

[0025] [Heat-insulating paint] The heat-shielding coating material in the first embodiment is used for forming a heat-shielding film having a transmittance of 50% or more for light having a wavelength of 300 nm or more and 800 nm or less, and contains (i) particles, (ii) a resin component, and (iii) an organic solvent, and either or both of the particles and the resin component have a refractive index with anomalous dispersion for light having a wavelength of 500 nm or more and 1000 nm or less, and the difference in refractive index between the particles and the resin component for light having a wavelength of 500 nm is smaller than the difference in refractive index between the particles and the resin component for light having a wavelength of 1000 nm.

[0026] The particles and resin components contained in the heat insulating paint can be the same as those described above in the heat insulating film, so a detailed description will be omitted.

[0027] The organic solvent contained in the heat insulating coating material is not particularly limited as long as it can mix the particles and the resin component. Examples of the organic solvent include toluene, xylene, methyl ethyl ketone, and ethyl acetate.

[0028] The heat insulating coating material may further contain a dispersant, a surfactant, and a viscosity modifier in addition to the above-mentioned particles, resin component, and organic solvent.

[0029] The heat insulating coating material can be produced by a known method.

[0030] [Painted items] The coated article in the first embodiment is a coated article having a substrate and a heat shielding film having a transmittance of 50% or more for light having a wavelength of 300 nm or more and 800 nm or less, and contains (i) particles and (ii) a resin component. In the heat shielding film, either or both of the particles and the resin component have a refractive index with anomalous dispersion for light having a wavelength of 500 nm or more and 1000 nm or less, and the difference in refractive index between the particles and the resin component for light having a wavelength of 500 nm is smaller than the difference in refractive index between the particles and the resin component for light having a wavelength of 1000 nm.

[0031] The particles and resin components contained in the coating can be the same as those described in the above [Heat barrier film], so a detailed description will be omitted.

[0032] The substrate is not particularly limited as long as it is capable of forming the heat insulating film, and examples thereof include automobiles, containers, window materials, films, and the like.

[0033] The method for producing the coated article is not particularly limited as long as it is capable of applying the above-mentioned heat insulating coating material to the substrate, and examples thereof include spray coating, roll coating, spin coating, and die coating.

[0034] Second Embodiment The thermal barrier film, paint, and coated article according to the second aspect will be described below. However, the present invention is not limited to the following embodiments.

[0035] [Heat shielding film] The heat shielding film in the second embodiment has a transmittance of 50% or more for light with a wavelength of 300 nm or more and 800 nm or less, a transmittance of 70% or more for light with a wavelength of 500 nm, and a reflectance of 30% or more for light with a wavelength of 1000 nm, thereby achieving both visible light transmittance and heat shielding properties.

[0036] The configuration of the heat shielding film can be the same as that described for the heat shielding film in the first embodiment, and therefore a description thereof will be omitted.

[0037] [Heat-insulating paint] The heat-shielding coating in the second embodiment is a heat-shielding coating used to form a heat-shielding film having a transmittance of 50% or more for light with a wavelength of 300 nm or more and 800 nm or less, a transmittance of 70% or more for light with a wavelength of 500 nm, and a reflectance of 30% or more for light with a wavelength of 1000 nm.

[0038] The configuration and manufacturing method of the heat insulating paint can be the same as those described for the heat insulating paint in the second embodiment, and therefore a description thereof will be omitted.

[0039] [Painted items] The coated article in the second embodiment is a coated article having a substrate and a heat-shielding film, the heat-shielding film having a transmittance of 50% or more for light with a wavelength of 300 nm or more and 800 nm or less, a transmittance of 70% or more for light with a wavelength of 500 nm, and a reflectance of 30% or more for light with a wavelength of 1000 nm.

[0040] The configuration and manufacturing method of the coated article can be the same as those described for the coated article in the second embodiment, and therefore a description thereof will be omitted. EXAMPLES

[0041] The present invention will be further described below with reference to examples and comparative examples, but the present invention is not limited to the following examples without going beyond the gist of the invention. "Parts" and "%" used in relation to the amount of components are based on mass unless otherwise specified. The product name "DisperBYK 111" used in Examples 1 to 7 and Comparative Example 1 is a dispersant manufactured by BYK Japan. The polystyrene used in Examples 1 to 5 and Comparative Example 1 is a polystyrene with an average molecular weight of 280,000 manufactured by Sigma-Aldrich Japan. The dye-introduced polystyrene used in Examples 6 and 7 was prepared by the following method. The average particle diameter (cumulative 50% particle diameter on a volume basis (D 50 ) was measured using a particle size distribution measuring device (trade name "UPA-EX150", manufactured by Nikkiso) using a dynamic light scattering method.

[0042] <Method of manufacturing dye-incorporated polystyrene> A dye-introduced polystyrene having an azo skeleton unit represented by the following structure was produced according to the following scheme.

[0043] [ka]

[0044] First, 100 parts of propylene glycol monomethyl ether was heated while replacing with nitrogen and refluxed at a liquid temperature of 120 ° C or more, and a mixture of 150 parts of styrene, 50 parts of acrylic acid, and 1.0 parts of tert-butyl peroxybenzoate [organic peroxide polymerization initiator, NOF Corp., product name: Perbutyl Z] was added dropwise over 3 hours. After the dropwise addition was completed, the solution was stirred for 3 hours, and then distilled at normal pressure while increasing the liquid temperature to 170 ° C. After the liquid temperature reached 170 ° C., the solvent was removed by distillation under reduced pressure at 1 hPa for 1 hour to obtain a resin solid. The solid was dissolved in tetrahydrofuran, reprecipitated with n-hexane, and the precipitated solid was filtered to obtain a polymer portion (A).

[0045] Next, 1.98 parts of compound (30) was added to 500 parts of tetrahydrofuran and heated to 80°C to dissolve. After dissolution, the temperature was lowered to 50°C, 3 parts of polymer portion (A) was added and dissolved, and 1.96 parts of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide·hydrochloride (EDC·HCl) was added and stirred at 50°C for 5 hours. The liquid temperature was then gradually returned to room temperature and the reaction was completed by stirring overnight. After the reaction was completed, the solution was filtered and concentrated, and purified by reprecipitation with methanol to obtain compound (115), which is a dye-introduced polystyrene. It was confirmed that this dye-introduced polystyrene has an anomalous dispersion refractive index for light with a wavelength of 500 nm or more and 1000 nm or less.

[0046] Example 1 Resin components Resin: Polystyrene 5.3 parts ·Anomalous dispersion material: SY162 3.5 parts Particles: Y 2 O 3 (Average particle size 1000nm) 11 parts The mixture was dispersed using a paint shaker together with methyl ethyl ketone as an organic solvent, 1.1 parts of DisperBYK 111 as a dispersant, and glass beads having a diameter of 1 mm, to obtain a heat insulating coating material 1.

[0047] This heat-shielding paint 1 was applied to a PET film substrate using a bar coater so that the thickness of the heat-shielding film became 100 μm, thereby obtaining a coated article 1 having a heat-shielding film.

[0048] Example 2 Resin components Resin: Polystyrene 5.3 parts ·Anomalous dispersion material: SY162 3.5 parts Particles: Y 2 O 3 (Average particle size 200nm) 11 parts The mixture was dispersed using a paint shaker together with methyl ethyl ketone as an organic solvent, 1.1 parts of DisperBYK 111 as a dispersant, and glass beads having a diameter of 1 mm, to obtain a heat insulating coating material 2.

[0049] This heat-shielding paint 2 was applied onto a PET film substrate using a bar coater so that the thickness of the heat-shielding film became 100 μm, thereby obtaining a coated article 2 having a heat-shielding film.

[0050] Example 3 Resin components Resin: 1.2 parts polystyrene Anomalous dispersion material: Iron oxide (average particle size 80 nm) 7.9 parts Particles: Diamond (average particle size 1000 nm) 0.87 parts The mixture was dispersed using a paint shaker together with methyl ethyl ketone as an organic solvent, 1.1 parts of DisperBYK 111 as a dispersant, and glass beads having a diameter of 1 mm, to obtain a heat insulating coating material 3.

[0051] This heat insulating paint 3 was applied onto a PET film substrate using a bar coater so that the thickness of the heat insulating film became 100 μm, thereby obtaining a coated article 3 having a heat insulating film.

[0052] Example 4 Resin components Resin: 1.2 parts polystyrene Anomalous dispersion material: Iron oxide (average particle size 120 nm) 7.9 parts Particles: Diamond (average particle size 1000 nm) 0.87 parts The mixture was dispersed using a paint shaker together with methyl ethyl ketone as an organic solvent, 1.1 parts of DisperBYK 111 as a dispersant, and glass beads having a diameter of 1 mm, to obtain heat insulating paint 4.

[0053] This heat-shielding paint 4 was applied onto a PET film substrate using a bar coater so that the thickness of the heat-shielding film became 100 μm, thereby obtaining a coated article 4 having a heat-shielding film.

[0054] Example 5 Resin components Resin: 1.2 parts polystyrene Anomalous dispersion material: Iron oxide (average particle size 80 nm) 7.9 parts Particles: Diamond (average particle size 200 nm) 0.87 parts The mixture was dispersed using a paint shaker together with methyl ethyl ketone as an organic solvent, 1.1 parts of DisperBYK 111 as a dispersant, and glass beads having a diameter of 1 mm, to obtain a heat insulating coating material 5.

[0055] This heat-shielding paint 5 was applied onto a PET film substrate using a bar coater so that the thickness of the heat-shielding film became 100 μm, thereby obtaining a coated article 5 having a heat-shielding film.

[0056] Example 6 Resin components Resin: 8.8 parts dye-infused polystyrene Particles: Y 2 O 3 (Average particle size 1000nm) 11 parts The mixture was dispersed using a paint shaker together with methyl ethyl ketone as an organic solvent, 1.1 parts of DisperBYK 111 as a dispersant, and glass beads having a diameter of 1 mm, to obtain a heat insulating paint 6.

[0057] This heat insulating paint 6 was applied onto a PET film substrate using a bar coater so that the thickness of the heat insulating film became 100 μm, thereby obtaining a coated article 6 having a heat insulating film.

[0058] Example 7 Resin components Resin: 8.8 parts dye-infused polystyrene Particles: Y 2 O 3 (Average particle size 200nm) 11 parts The mixture was dispersed using a paint shaker together with methyl ethyl ketone as an organic solvent, 1.1 parts of DisperBYK 111 as a dispersant, and glass beads having a diameter of 1 mm, to obtain heat insulating paint 7.

[0059] This heat-shielding paint 7 was applied onto a PET film substrate using a bar coater so that the thickness of the heat-shielding film became 100 μm, thereby obtaining a coated article 7 having a heat-shielding film.

[0060] Comparative Example 1 A heat insulating coating material 8 was obtained in the same manner as in Example 1, except that the anomalous dispersion material SY162 was not used.

[0061] This heat-shielding paint 8 was applied onto a PET film substrate using a bar coater so that the thickness of the heat-shielding film became 100 μm, thereby obtaining a coated article 8 having a heat-shielding film.

[0062] The difference in refractive index between the particles and the resin component used in heat insulating coatings 1 to 7 for light with a wavelength of 500 nm was 0 or more and 0.10 or less, and the difference in refractive index for light with a wavelength of 1000 nm was 0.20 or more. On the other hand, the difference in refractive index between the particles and the resin component used in heat insulating coating 8 for light with a wavelength of 500 nm was higher than 0.10, and the difference in refractive index for light with a wavelength of 1000 nm was 0.20 or more.

[0063] The resin components used in heat-shielding coatings 1 to 7, which have an anomalous dispersion refractive index for light with a wavelength of 500 nm or more and 1000 nm or less, had a refractive index of 1.60 or more and 2.10 or less for light with a wavelength of 500 nm, and a refractive index of 1.50 or more and 1.70 or less for light with a wavelength of 1000 nm. On the other hand, the particles and resin components used in heat-shielding coating 8 did not have an anomalous dispersion refractive index.

[0064] Furthermore, the particles used in the heat insulating coatings 1 to 8 had a refractive index for light with a wavelength of 500 nm of 1.60 or more and 2.00 or less.

[0065] <Evaluation> For the obtained coated objects 1 to 8, the transmittance for light with a wavelength of 500 nm and the reflectance for light with a wavelength of 1000 nm were measured using a spectrophotometer, and evaluation was performed according to the following criteria.

[0066] (Transmittance to light with a wavelength of 500 nm) A: Transmittance is 80% or more and 100% or less B: Transmittance is 70% or more and less than 80% C: Transmittance is 0% or more and less than 70% (Reflectance to light with a wavelength of 1000 nm) A: Reflectance is between 50% and 100% B: Reflectance is 30% or more and less than 50% C: Reflectance is 0% or more and less than 30%

[0067] [Table 1]

[0068] The disclosure of this embodiment includes the following configuration.

[0069] (Configuration 1) A heat shielding film having a light transmittance of 50% or more for a wavelength of 300 nm or more and 800 nm or less, (i) particles; and (ii) a resin component; one or both of the particles and the resin component has an anomalous dispersion refractive index for light having a wavelength of 500 nm or more and 1000 nm or less, A heat shielding film, characterized in that the difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is smaller than the difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm.

[0070] (Configuration 2) The heat shielding film according to configuration 1, wherein the difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is 0 or more and 0.10 or less, and the difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm is 0.20 or more.

[0071] (Configuration 3) 3. The heat shielding coating according to claim 1 or 2, wherein the particles have an average particle size of 0.3 μm or more and 5.0 μm or less.

[0072] (Configuration 4) 4. The heat shielding film according to any one of claims 1 to 3, having a thickness of 1 μm or more.

[0073] (Configuration 5) 5. The heat shielding film according to any one of claims 1 to 4, wherein the transmittance of light with a wavelength of 300 nm or more and 800 nm or less is 70% or more.

[0074] (Configuration 6) 6. The heat shielding film according to any one of claims 1 to 5, wherein the particles have a refractive index that exhibits anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less.

[0075] (Configuration 7) 7. The heat shielding film according to any one of claims 1 to 6, wherein the resin component contains a resin having a refractive index with anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less.

[0076] (Configuration 8) 8. The heat shielding film according to claim 7, wherein the resin having an anomalous dispersion refractive index for light with a wavelength of 500 nm or more and 1000 nm or less has a peak in a wavelength region of 300 nm or more and 500 nm or less in a spectral absorption spectrum.

[0077] (Configuration 9) 9. The heat shielding film according to any one of configurations 1 to 8, wherein the resin component contains a resin and an anomalous dispersion material having an anomalous dispersion refractive index for light having a wavelength of 500 nm or more and 1000 nm or less.

[0078] (Configuration 10) The heat shielding film according to any one of Configurations 1 to 9, wherein the particles or resin component having a refractive index with anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less has a refractive index for light with a wavelength of 500 nm or more of 1.60 or more and 2.10 or less, and a refractive index for light with a wavelength of 1000 nm or less of 1.50 or more and 1.70 or less.

[0079] (Configuration 11) 11. The heat shielding film according to any one of configurations 1 to 10, wherein the particles have a refractive index of 1.60 or more and 2.00 or less for light with a wavelength of 500 nm.

[0080] (Configuration 12) A heat-shielding paint used to form a heat-shielding film having a light transmittance of 50% or more for a wavelength of 300 nm or more and 800 nm or less, (i) particles, (ii) a resin component, and (iii) an organic solvent; one or both of the particles and the resin component has an anomalous dispersion refractive index for light having a wavelength of 500 nm or more and 1000 nm or less, A heat insulating coating material, characterized in that the difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is smaller than the difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm.

[0081] (Configuration 13) A coated article having a substrate and a heat shielding film having a light transmittance of 50% or more for a wavelength of 300 nm or more and 800 nm or less, (i) particles; and (ii) a resin component; In the heat shielding film, one or both of the particles and the resin component have a refractive index with anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less, A coated article, characterized in that the difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is smaller than the difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm.

[0082] (Configuration 14) The transmittance of light having a wavelength of 300 nm or more and 800 nm or less is 50% or more, The transmittance of light with a wavelength of 500 nm is 70% or more, The reflectance of light with a wavelength of 1000 nm is 30% or more. A heat shielding film characterized by:

[0083] (Configuration 15) The transmittance of light having a wavelength of 300 nm or more and 800 nm or less is 50% or more, The transmittance of light with a wavelength of 500 nm is 70% or more, The reflectance of light with a wavelength of 1000 nm is 30% or more. A heat insulating paint characterized by being used for forming a heat insulating film.

[0084] (Configuration 16) A coated article having a substrate and a heat insulating film, The heat shielding film is The transmittance of light having a wavelength of 300 nm or more and 800 nm or less is 50% or more, The transmittance of light with a wavelength of 500 nm is 70% or more, The reflectance of light with a wavelength of 1000 nm is 30% or more. A coated article characterized by the above.

Claims

1. A heat shielding film having a transmittance of 50% or more for light having a wavelength of 300 nm or more and 800 nm or less, (i) particles; and (ii) a resin component; one or both of the particles and the resin component has an anomalous dispersion refractive index for light with a wavelength of 500 nm or more and 1000 nm or less, A heat shielding film, characterized in that a difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is smaller than a difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm.

2. 2. The heat shielding film according to claim 1, wherein a difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is 0 or more and 0.10 or less, and a difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm is 0.20 or more.

3. The heat shielding film according to claim 1, wherein the average particle size of the particles is 0.3 μm or more and 5.0 μm or less.

4. The heat shielding film according to claim 1, having a thickness of 1 μm or more.

5. The heat shielding film according to claim 1 , wherein the transmittance of light having a wavelength of 300 nm or more and 800 nm or less is 70% or more.

6. The heat shielding film according to claim 1 , wherein the particles have a refractive index that exhibits anomalous dispersion for light having a wavelength of 500 nm or more and 1000 nm or less.

7. The heat shielding film according to claim 1 , wherein the resin component contains a resin having a refractive index with anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less.

8. 8. The heat shielding film according to claim 7, wherein the resin having an anomalous dispersion refractive index for light with a wavelength of 500 nm or more and 1000 nm or less has a peak in a wavelength region of 300 nm or more and 500 nm or less in a spectral absorption spectrum.

9. The heat shielding film according to claim 1 , wherein the resin component contains a resin and an anomalous dispersion material having an anomalous dispersion refractive index for light having a wavelength of 500 nm or more and 1000 nm or less.

10. 2. The heat shielding film according to claim 1, wherein the particles or resin component having a refractive index of anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less has a refractive index for light with a wavelength of 500 nm or more of 1.60 or more and 2.10 or less, and a refractive index for light with a wavelength of 1000 nm or more of 1.50 or more and 1.70 or less.

11. 2. The heat shielding film according to claim 1, wherein the particles have a refractive index of 1.60 or more and 2.00 or less for light with a wavelength of 500 nm.

12. A heat-shielding paint used to form a heat-shielding film having a light transmittance of 50% or more for a wavelength of 300 nm or more and 800 nm or less, (i) particles, (ii) a resin component, and (iii) an organic solvent; one or both of the particles and the resin component has an anomalous dispersion refractive index for light with a wavelength of 500 nm or more and 1000 nm or less, A heat insulating coating material, characterized in that the difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is smaller than the difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm.

13. A coated article having a substrate and a heat shielding film having a light transmittance of 50% or more for a wavelength of 300 nm or more and 800 nm or less, (i) particles; and (ii) a resin component; In the heat shielding film, one or both of the particles and the resin component have a refractive index with anomalous dispersion for light with a wavelength of 500 nm or more and 1000 nm or less, A coated article, characterized in that the difference in refractive index between the particles and the resin component for light with a wavelength of 500 nm is smaller than the difference in refractive index between the particles and the resin component for light with a wavelength of 1000 nm.

14. The transmittance of light having a wavelength of 300 nm or more and 800 nm or less is 50% or more, The transmittance of light with a wavelength of 500 nm is 70% or more, The reflectance of light with a wavelength of 1000 nm is 30% or more. A heat shielding film characterized by:

15. The transmittance of light having a wavelength of 300 nm or more and 800 nm or less is 50% or more, The transmittance of light with a wavelength of 500 nm is 70% or more, The reflectance of light with a wavelength of 1000 nm is 30% or more. A heat insulating paint characterized by being used for forming a heat insulating film.

16. A coated article having a substrate and a heat insulating film, The heat shielding film is The transmittance of light having a wavelength of 300 nm or more and 800 nm or less is 50% or more, The transmittance of light with a wavelength of 500 nm is 70% or more, The reflectance of light with a wavelength of 1000 nm is 30% or more. A coated article characterized by the above.

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