WO2024085103A1 - Structure de refroidissement par rayonnement et son procédé de fabrication - Google Patents

Structure de refroidissement par rayonnement et son procédé de fabrication Download PDF

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Publication number
WO2024085103A1
WO2024085103A1 PCT/JP2023/037342 JP2023037342W WO2024085103A1 WO 2024085103 A1 WO2024085103 A1 WO 2024085103A1 JP 2023037342 W JP2023037342 W JP 2023037342W WO 2024085103 A1 WO2024085103 A1 WO 2024085103A1
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WO
WIPO (PCT)
Prior art keywords
cooling structure
radiative cooling
protective layer
resin
structure according
Prior art date
Application number
PCT/JP2023/037342
Other languages
English (en)
Japanese (ja)
Inventor
博文 宮田
京生 魚住
将広 楢崎
Original Assignee
バンドー化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by バンドー化学株式会社 filed Critical バンドー化学株式会社
Priority to JP2023563302A priority Critical patent/JP7508714B1/ja
Publication of WO2024085103A1 publication Critical patent/WO2024085103A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/111—Anti-reflection coatings using layers comprising organic materials
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/08—Mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/26—Reflecting filters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating

Definitions

  • the present invention relates to a radiative cooling structure and a method for manufacturing the same.
  • Patent Document 1 discloses a radiative cooling structure in which the reflective layer is made of silver or a silver alloy and the resin layer is made of polyvinyl chloride resin or vinylidene chloride resin.
  • the present invention is a radiative cooling structure that includes a reflective layer and a transparent protective layer provided on the reflective layer, and an uneven surface is formed on the protective layer by providing a large number of protrusions of different sizes.
  • the present invention is a method for manufacturing a radiative cooling structure that includes a reflective layer and a transparent protective layer provided on the reflective layer, and has an uneven surface formed by providing a large number of protrusions of different sizes on the protective layer, and the large number of protrusions are formed by forming a large number of droplets of liquid resin on the protective layer and solidifying the large number of droplets.
  • FIG. 1 is a diagram showing the structure of a radiative cooling sheet according to an embodiment.
  • FIG. 1 is a cross-sectional view of a radiative cooling sheet according to an embodiment.
  • FIG. 13 is a cross-sectional view of a first modified example of a radiative cooling sheet according to an embodiment.
  • FIG. 13 is a cross-sectional view of a second modified example of the radiative cooling sheet according to an embodiment.
  • 1 is a microscope photograph of an uneven surface formed by repeatedly performing the process of forming droplets of a liquid resin coating material and then solidifying the droplets.
  • FIGS 1A and 1B show a radiative cooling sheet 10 according to an embodiment.
  • This radiative cooling sheet 10 is used by being attached to the surface of an object to be cooled, such as building materials for houses, factories, and warehouses; containers such as installation containers, transport containers, and portable containers; interior parts, and automobile-related parts such as air conditioning systems, fuel systems, and battery systems, and when irradiated with sunlight, it blocks heat and cools the object to be cooled inside.
  • an object to be cooled such as building materials for houses, factories, and warehouses; containers such as installation containers, transport containers, and portable containers; interior parts, and automobile-related parts such as air conditioning systems, fuel systems, and battery systems, and when irradiated with sunlight, it blocks heat and cools the object to be cooled inside.
  • the side irradiated with sunlight is referred to as "top” and the side of the object to be cooled is referred to as "bottom”.
  • the radiative cooling sheet 10 includes a base layer 11, an anchor coat layer 12 provided directly on the base layer 11, a reflective layer 13 provided directly on the anchor coat layer 12, and a transparent protective layer 14 provided directly on the reflective layer 13.
  • the surface of the protective layer 14 has an uneven surface 16 formed by providing a large number of transparent protrusions 15 of different sizes.
  • a radiative cooling structure is formed by the reflective layer 13, the protective layer 14, and the uneven surface 16.
  • the light enters through the uneven surface 16, passes through the transparent protective layer 14, and then reaches the reflective layer 13 where it is reflected.
  • the light reflected by the reflective layer 13 passes through the protective layer 14 again and exits through the uneven surface 16.
  • the wavelength of light is concentrated in a wavelength band (7 to 14 ⁇ m) called the "atmospheric window" where electromagnetic radiation is hardly absorbed by the atmosphere, the object to be cooled is cooled by efficiently releasing heat into the atmosphere through the radiative cooling sheet 10, and the surface temperature drops.
  • the radiative cooling structure of the radiative cooling sheet 10 of the embodiment heat dissipation is promoted by the lens effect of the uneven surface 16 formed on the protective layer 14, so high radiative cooling performance can be obtained, and the light reflected by the reflective layer 13 is diffused by the uneven surface 16, so high anti-glare performance can be obtained.
  • the 20 degree specular gloss Gs (20°) is preferably 600% or less, more preferably 300% or less, and even more preferably 100% or less.
  • the 60 degree specular gloss Gs (60°) is preferably 350% or less, more preferably 150% or less, and even more preferably 70% or less.
  • the 85 degree specular gloss Gs (85°) is preferably 35% or less, more preferably 20% or less, and even more preferably 10% or less.
  • the solar reflectance of the radiative cooling sheet 10 according to the embodiment over the entire wavelength range is preferably 90% or less, and more preferably 84% or less. This solar reflectance over the entire wavelength range is determined based on JIS K5602:2008 (hereinafter the same).
  • the substrate layer 11 is composed of, for example, a resin film.
  • the resin that forms the substrate layer 11 include polyester resin and polycarbonate resin.
  • the thickness of the substrate layer 11 is, for example, 10 ⁇ m or more and 300 ⁇ m or less.
  • the anchor coat layer 12 is composed of, for example, a hardened resin adhesive.
  • the resin adhesive used to form the anchor coat layer 12 include a urethane adhesive and an epoxy adhesive.
  • the reflective layer 13 is composed of, for example, a metal film.
  • metals that form the reflective layer 13 include silver, silver alloys, aluminum, and aluminum alloys. From the viewpoint of obtaining high radiative cooling performance, the metals that form the reflective layer 13 are preferably silver and silver alloys, and more preferably silver.
  • the solar reflectance of the reflective layer 13 over the entire wavelength range is preferably 90% or more.
  • the thickness of the reflective layer 13 is, for example, 50 nm or more and 300 nm or less.
  • the reflective layer 13 can be formed by forming an anchor coat layer 12 by coating and curing a resin adhesive on the base layer 11, and then depositing a metal film on the anchor coat layer 12.
  • film deposition methods include dry film deposition methods such as vapor deposition, sputtering, and ion plating; and wet film deposition methods using a silver mirror reaction.
  • the reflective layer 13 may be formed directly on the substrate layer 11 as shown in FIG. 2.
  • the reflective layer 13 is formed by forming a film of silver using a silver mirror reaction
  • the substrate layer 11 is a polycarbonate resin film
  • the reflective layer 13 can be provided directly on the substrate layer 11 because high adhesion or bonding of the reflective layer 13 to the substrate layer 11 can be obtained, and the wettability of the substrate layer 11 is high and the film-forming properties of the reflective layer 13 are excellent.
  • the substrate layer 11 is a polyester resin film
  • the wettability of the substrate layer 11 is high and the film-forming properties of the reflective layer 13 are excellent, but the adhesion or bonding of the reflective layer 13 to the substrate layer 11 is poor, so it is preferable to provide the reflective layer 13 on the substrate layer 11 via the anchor coat layer 12.
  • the protective layer 14 is formed, for example, from a resin.
  • the resin forming the protective layer 14 include acrylic resin, urethane resin, urethane acrylic resin, polyester resin, etc.
  • the term "acrylic resin” in this application refers to a polymer resin obtained by addition polymerization of acrylic acid, methacrylic acid, and their derivatives (e.g., acrylamide, acrylonitrile, etc.) as monomers.
  • acrylic resin include acrylic resin of polyacrylic acid, polymethacrylic acid resin, polymethyl methacrylate resin, etc.
  • urethane acrylic resin and polyester resin are preferred as the resin forming the protective layer 14 from the viewpoint of obtaining high radiative cooling performance.
  • the total light transmittance of the resin forming the protective layer 14 is preferably 85% or more, more preferably 90% or more, from the viewpoint of obtaining high radiative cooling performance. This total light transmittance is measured based on JIS K7361-1:1997 (the same applies below).
  • the thickness of the protective layer 14 is, for example, 10 ⁇ m or more and 100 ⁇ m or less, and from the viewpoint of suppressing heat accumulation, is preferably 60 ⁇ m or less, and more preferably 40 ⁇ m or less.
  • the protective layer 14 may be composed of a solidified resin coating material coated on the reflective layer 13.
  • the resin coating material include an ultraviolet-curable resin coating material, a thermosetting resin coating material, and a thermoplastic resin solution.
  • the protective layer 14 may be made of a resin film.
  • the protective layer 14 made of a resin film is preferably provided on the reflective layer 13 via an adhesive layer 17, as shown in FIG. 3.
  • the adhesive layer 17 is made of, for example, a cured resin adhesive. Examples of the resin adhesive used to form the adhesive layer 17 include a urethane-based adhesive.
  • the convex portion 15 is formed of, for example, a resin.
  • the resin forming the convex portion 15 may be the same as the resin forming the protective layer 14, but it is preferable that they are different from the viewpoint of obtaining high radiation cooling performance.
  • the resin forming the convex portion 15 include acrylic resin, urethane resin, urethane acrylic resin, etc.
  • the resin forming the convex portion 15 is preferably an acrylic resin, and more preferably an acrylic resin of polyacrylic acid.
  • the total light transmittance of the resin forming the convex portion 15 is preferably 85% or more, more preferably 90% or more.
  • the total light transmittance of the resin forming the convex portion 15 is higher than the total light transmittance of the resin forming the protective layer 14.
  • the shape of the convex portion 15 is preferably a hemisphere or a semi-ellipsoid.
  • the outer diameter of the convex portion 15 is preferably 1 ⁇ m or more and 100 ⁇ m or less, more preferably 5 ⁇ m or more and 80 ⁇ m or less, and even more preferably 10 ⁇ m or more and 25 ⁇ m or less, from the viewpoint of obtaining high radiation cooling performance and high anti-glare performance.
  • the aspect ratio (major axis/minor axis) of the convex portion 15 is preferably 4 or less, more preferably 2 or less, and even more preferably 1.5 or less.
  • the height of the convex portion 15 is preferably 1 ⁇ m or more and 100 ⁇ m or less, more preferably 5 ⁇ m or more and 50 ⁇ m or less, and even more preferably 10 ⁇ m or more and 15 ⁇ m or less.
  • a large number of convex portions 15 of different sizes are provided on the surface of the protective layer 14 to form the uneven surface 16.
  • the median is preferably 5 ⁇ m or more and 15 ⁇ m or less, more preferably 8 ⁇ m or more and 12 ⁇ m or less, from the viewpoint of obtaining high radiation cooling performance and high anti-glare performance.
  • the first quartile is preferably 3 ⁇ m or more and 12 ⁇ m or less, more preferably 6 ⁇ m or more and 9 ⁇ m or less.
  • the third quartile is preferably 15 ⁇ m or more and 25 ⁇ m or less, more preferably 18 ⁇ m or more and 22 ⁇ m or less.
  • the quartile range is preferably 8 ⁇ m or more and 20 ⁇ m or less, more preferably 10 ⁇ m or more and 15 ⁇ m or less.
  • the outer diameter distribution of the convex portions 15 is obtained by analyzing the image of the uneven surface 16 of the surface observed by a laser microscope using image analysis software. Specifically, the surface of the protective layer 14 is used as a reference plane, and the parts higher than the reference plane are used as the convex parts 15.
  • the outer diameters of the numerous convex parts 15 that make up the uneven surface 16 (the average value of the long and short diameters when the shape of the convex parts 15 in plan view is approximated as an ellipse) are measured, and the distribution is output.
  • the uneven surface 16 is preferably configured with a large number of small protrusions 15 in order to increase the surface area and improve heat dissipation, and to diffuse the light reflected from the reflective layer 13 and release it to the outside.
  • the area ratio of the numerous convex portions 15 on the uneven surface 16 is preferably 10% or more, more preferably 15% or more, and even more preferably 30% or more, from the viewpoint of obtaining high radiation cooling performance and high anti-glare performance. This area ratio is also determined by analyzing an image of the uneven surface 16 observed by a laser microscope using image analysis software. Specifically, the surface of the protective layer 14 is set as a reference surface, and the parts higher than the reference surface are set as convex portions 15. These reference surface parts and convex portions 15 parts are then binarized and edited, and the area ratio of the entire surface occupied by the convex portions 15 is calculated and output.
  • the arithmetic mean height Sa of the uneven surface 16 is preferably 1 ⁇ m or more and 10 ⁇ m or less, more preferably 1.5 ⁇ m or more and 4 ⁇ m or less, and even more preferably 2 ⁇ m or more and 3 ⁇ m or less, from the viewpoint of obtaining high radiation cooling performance and high anti-glare performance.
  • This arithmetic mean height Sa is measured using a laser microscope (e.g., KEYENCE VK-X150/KV-X100) based on ISO25178. From the same viewpoint, it is also preferable that the numerous convex portions 15 constituting the uneven surface 16 are randomly arranged on the protective layer 14.
  • the numerous protrusions 15 that make up the uneven surface 16 may be formed by forming numerous droplets of a liquid resin coating material on the protective layer 14 by spray coating or inkjet coating, and then solidifying the numerous droplets.
  • the contact angle of the droplets on the protective layer 14, as measured by the ⁇ /2 method, is, for example, 5° or more and 90° or less.
  • the multiple convex portions 15 are preferably formed by repeating the operation of forming droplets of the liquid resin coating material and solidifying them multiple times.
  • a solidified droplet 151 formed in the first operation is placed on top of a solidified droplet 152 formed in the second operation, and a further solidified droplet 153 formed in the third operation is placed on top of that, and this is repeated until the solidified droplets 151, 152, 153, ... are stacked to form the convex portion 15.
  • the number of times the operation of forming droplets of the liquid resin coating material and solidifying them is repeated is preferably 15 times or less, more preferably 10 times or less.
  • resin coating materials include ultraviolet-curable resin coating materials, thermosetting resin coating materials, and thermoplastic resin solutions.
  • ultraviolet-curable resin coating material By using an ultraviolet-curable resin coating material, a large number of protrusions 15 can be easily formed with simple operations.
  • a room temperature curable water-based thermosetting resin coating material it is preferable to perform drying at a low temperature after coating in order to prevent the droplets from coalescing before forming the protrusions 15.
  • the drying temperature is preferably 50°C or less, and more preferably 30°C or less. From the same perspective, it is also preferable to perform drying at a low humidity after coating.
  • the drying humidity is preferably 70% or less, and more preferably 50% or less.
  • the radiative cooling sheet 10 includes an adhesive layer 18 provided directly below the base layer 11 and a release layer 19 provided directly above the adhesive layer 18.
  • the adhesive layer 18 is made of, for example, a resin-based adhesive.
  • the resin-based adhesive that makes up the adhesive layer 18 include acrylic resin-based adhesives.
  • the release layer 19 is made of, for example, release paper.
  • the radiative cooling sheet 10 is used by peeling off the release layer 19 and attaching it to the surface of the object to be cooled via the adhesive layer 18.
  • the radiative cooling sheet 10 is attached to the object to be cooled, but this is not particularly limited, and the radiative cooling structure of the radiative cooling sheet 10 according to the embodiment can also be applied to clothing such as hats and clothes using a fabric material as the base material.
  • Example 1 A thin silver film of the reflective layer was formed by applying a silver mirror coating to the surface of a rectangular polycarbonate plate with a length of 52 mm, a width of 84 mm, and a thickness of 2 mm. The solar reflectance of the reflective layer in the entire wavelength range was 97%. The thickness of the reflective layer was 100 nm.
  • a protective layer was formed by applying a urethane acrylic resin coating material onto the reflective layer and curing it.
  • the protective layer was placed on a polycarbonate plate with a total light transmittance of approximately 90%, and the total light transmittance was measured to be 91%.
  • the thickness of the protective layer was 58 ⁇ m.
  • Example 1 The test piece prepared in the above manner was designated as Example 1.
  • Example 2 A test piece was prepared as Example 2 in the same manner as in Example 1, except that the process of forming droplets of the liquid uncured ultraviolet-curable acrylic resin coating material and solidifying them was repeated three times.
  • the average dimensions of 50 randomly selected convex portions were found to be 13 ⁇ m in outer diameter, 13 ⁇ m in height, and 1.2 in height to outer diameter ratio.
  • the proportion of the surface area occupied by the convex portions on the uneven surface was 36%.
  • the arithmetic mean height Sa of the uneven surface was 2.4 ⁇ m.
  • thermocouple was attached to the back surface on the polycarbonate plate side and the light-irradiated surface on the opposite side.
  • the test pieces were placed so that the light-irradiated surface faced a position 280 mm away from a 500 W projector.
  • the test pieces were irradiated with light from the projector.
  • the average temperatures of the light-irradiated surface and the back surface were determined from 15 minutes to 20 minutes after the start of light irradiation.
  • Test results The test results are shown in Table 1. From Table 1, it can be seen that the back surface temperature of both Examples 1 and 2 is about 2°C lower than that of Comparative Example 1. In other words, Examples 1 and 2 have higher heat shielding performance than Comparative Example 1. On the other hand, when comparing Example 1 and Comparative Example 1, the latter has a higher solar reflectance over the entire wavelength range than the former. In other words, it is presumed that the heat shielding performance due to reflection is higher in Comparative Example 1 than in Example 1. From these facts, it is considered that Examples 1 and 2 have high radiative cooling performance.
  • Test piece: Example 3 A commercially available material was used in which a thin silver film of a reflective layer was formed on a substrate, and a polyester resin film of a thickness of 25 ⁇ m was laminated on the thin silver film of a protective layer, and a large number of droplets of a liquid uncured water-based urethane resin coating material that cures at room temperature were formed on the protective layer by spray coating, and the large number of droplets were held at room temperature to cure and solidify to form a large number of convex parts, and the large number of convex parts constituted an uneven surface on the protective layer.
  • the test piece thus prepared was designated as Example 3.
  • the surface of the protective layer was used as the reference plane, and the parts higher than the reference plane were used as the convex parts.
  • the outer diameter of each of the numerous convex parts that make up the uneven surface was measured, and the distribution was output.
  • the outer diameter of the convex parts was determined as the average of the long and short diameters when the shape of the convex parts was approximated as an ellipse.
  • Parts with an aspect ratio (long diameter/short diameter) of 2 or less and an outer diameter of 2 ⁇ m or more were treated as convex parts, and those with an outer diameter of less than 2 ⁇ m were excluded as noise.
  • Parts in which multiple convex parts were united were subjected to a division process.
  • the obtained distribution of the outer diameters of the convex parts was statistically processed to determine the median, first quartile, third quartile, and interquartile range of the outer diameters of the convex parts.
  • Example 4 A test piece was prepared in the same manner as in Example 3, except that the operation of forming droplets of the liquid uncured room temperature curing water-based urethane resin coating material and solidifying them was repeated three times.
  • Example 5 A test piece was prepared in the same manner as in Example 4, except that the operation of forming droplets of the liquid uncured room temperature curing water-based urethane resin coating material and solidifying them was repeated six times.
  • the area ratio of the convex parts of the uneven surface that is, the parts formed by the coating material, was 92.3%.
  • the arithmetic mean height Sa of the uneven surface was 3.8 ⁇ m.
  • Example 6 A test piece was prepared in the same manner as in Example 4, except that the operation of forming droplets of the liquid uncured room temperature curing water-based urethane resin coating material and solidifying them was repeated nine times.
  • the area ratio of the convex parts of the uneven surface that is, the parts formed by the coating material, was 100%.
  • the arithmetic mean height Sa of the uneven surface was 5.4 ⁇ m.
  • ⁇ Comparative Example 2> A commercially available material in which a thin silver film of a reflective layer was formed on a substrate and a polyester resin film of a thickness of 25 ⁇ m was laminated on top of that as a protective layer was used as the comparative example 2 of the test piece. The occupied area ratio of the portion formed by the coating material was 0%.
  • Comparative Example 3 A test piece prepared in the same manner as in Example 3 was used as Comparative Example 3, except that a liquid uncured room temperature curable water-based urethane resin coating material was uniformly sprayed onto the protective layer by spray coating, and then the coating material was held at room temperature to harden and solidify to form a film. The area occupied by the coating material was 100%.
  • Each test piece of Examples 4 to 6 and Comparative Examples 2 to 3 was attached to the surface of a rectangular polycarbonate plate measuring 55 mm in length, 85 mm in width, and 2 mm in thickness, and a thermocouple was attached to the back surface of the polycarbonate plate and the light-irradiated surface of the test piece.
  • the test pieces were placed at a position 370 mm away from a 500 W halogen light so that the light-irradiated surface of the test piece faced the light.
  • the test pieces were irradiated with light from a projector.
  • the average temperatures of the light-irradiated surface of the test piece and the back surface of the polycarbonate plate were obtained from 15 minutes to 20 minutes after the start of the light irradiation.
  • the present invention is useful in the technical field of radiative cooling structures and manufacturing methods thereof.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Laminated Bodies (AREA)

Abstract

Cette structure de refroidissement par rayonnement est pourvue d'une couche réfléchissante (13) et d'une couche de protection transparente (14) disposée sur la couche réfléchissante. Une surface en relief (16) conçue en constituant un grand nombre de parties saillantes (15) de taille différente sur la couche de protection (14) est formée.
PCT/JP2023/037342 2022-10-19 2023-10-16 Structure de refroidissement par rayonnement et son procédé de fabrication WO2024085103A1 (fr)

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JP2023563302A JP7508714B1 (ja) 2022-10-19 2023-10-16 放射冷却構造及びその製造方法

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JP2022-167475 2022-10-19
JP2022167475 2022-10-19
JP2023051926 2023-03-28
JP2023-051926 2023-03-28

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WO2024085103A1 true WO2024085103A1 (fr) 2024-04-25

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007187971A (ja) * 2006-01-16 2007-07-26 Konica Minolta Opto Inc 防眩性反射防止フィルム及びその製造方法、並びに偏光板及び表示装置
JP2018526599A (ja) * 2015-06-18 2018-09-13 ザ トラスティーズ オブ コロンビア ユニヴァーシティ イン ザ シティ オブ ニューヨーク 放射冷却および加熱用のシステムならびに方法
JP2021529680A (ja) * 2019-05-31 2021-11-04 寧波瑞凌新能源科技有限公司Ｎｉｎｇｂｏ Ｒａｄｉ−Ｃｏｏｌ Ａｄｖａｎｃｅｄ Ｅｎｅｒｇｙ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．， Ｌｔｄ． 複合放射冷却膜、複合放射冷却膜材料及びその応用

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007187971A (ja) * 2006-01-16 2007-07-26 Konica Minolta Opto Inc 防眩性反射防止フィルム及びその製造方法、並びに偏光板及び表示装置
JP2018526599A (ja) * 2015-06-18 2018-09-13 ザ トラスティーズ オブ コロンビア ユニヴァーシティ イン ザ シティ オブ ニューヨーク 放射冷却および加熱用のシステムならびに方法
JP2021529680A (ja) * 2019-05-31 2021-11-04 寧波瑞凌新能源科技有限公司Ｎｉｎｇｂｏ Ｒａｄｉ−Ｃｏｏｌ Ａｄｖａｎｃｅｄ Ｅｎｅｒｇｙ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．， Ｌｔｄ． 複合放射冷却膜、複合放射冷却膜材料及びその応用

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