CN111114031B - Radiation refrigeration film, radiation refrigeration composite film and radiation refrigeration product - Google Patents

Radiation refrigeration film, radiation refrigeration composite film and radiation refrigeration product Download PDF

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Publication number
CN111114031B
CN111114031B CN201911425218.0A CN201911425218A CN111114031B CN 111114031 B CN111114031 B CN 111114031B CN 201911425218 A CN201911425218 A CN 201911425218A CN 111114031 B CN111114031 B CN 111114031B
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film
radiation refrigeration
radiation
layer
filler
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CN111114031A (en
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徐绍禹
吕乐
夏兆路
蔡梦丹
王明辉
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Ningbo Ruiling New Energy Technology Co ltd
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Ningbo Ruiling New Energy Technology Co ltd
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Priority to JP2020090763A priority patent/JP7149983B2/en
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    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • 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
    • B32B11/00—Layered products comprising a layer of bituminous or tarry substances
    • B32B11/04—Layered products comprising a layer of bituminous or tarry substances comprising such bituminous or tarry substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
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    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
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    • 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
    • B32B15/06—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 natural rubber or synthetic rubber
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    • 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
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    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
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    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
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    • 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
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B32B27/205—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents the fillers creating voids or cavities, e.g. by stretching
    • 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
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • 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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
    • E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
    • 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl 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
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0264—Polyester
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/408—Matt, dull surface
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/418—Refractive
    • 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
    • B32B2419/00—Buildings or parts thereof
    • B32B2419/06—Roofs, roof membranes
    • 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
    • B32B2607/00—Walls, panels
    • B32B2607/02—Wall papers, wall coverings

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a radiation refrigeration film, which comprises a substrate layer and a filler distributed in the substrate layer, wherein the refractive index of the material of the substrate layer is n, n is 1.3-1.7, the refractive index of the filler is m, the difference value of n and m is x, the absolute value of x is more than or equal to 0.05%, the emissivity of the radiation refrigeration film in an atmosphere window of 7-14 mu m is more than or equal to 80%, the heat reflectivity of a wave band of 300-2500 nm is more than or equal to 10%, and the glossiness of the radiation refrigeration film is less than or equal to 20 GU. According to the invention, through the selection of the material and the filler of the matrix layer and the adjustment of the relation of the refractive indexes, the radiation refrigeration effect of the radiation refrigeration film is excellent and the glossiness is low. The invention also provides a radiation refrigeration composite film and a radiation refrigeration product, which can effectively reduce light pollution in the using process and ensure excellent radiation refrigeration effect.

Description

Radiation refrigeration film, radiation refrigeration composite film and radiation refrigeration product
Technical Field
The invention relates to the technical field of films, in particular to a radiation refrigeration film, a radiation refrigeration composite film and a radiation refrigeration product.
Background
The radiation refrigeration composite film is a film capable of adjusting temperature, has the advantages of no energy consumption and no pollution, and is widely applied to the fields of energy-saving building materials, photovoltaic industry, outdoor products and the like. In the field of energy-saving building materials, a radiation refrigeration composite film is usually attached to an outer wall or a roof of a building, can reflect sunlight and transmits heat to outer space in an infrared radiation mode of an atmospheric window waveband so as to reduce the indoor temperature of the building. However, the mirror reflection of the traditional radiation refrigeration composite film is obvious, and light pollution is easily caused.
The reason is that in the traditional radiation refrigeration composite film, the radiation refrigeration film is made of only a single high polymer material or inorganic filler is added in the high polymer material, the haze of the radiation refrigeration film is only about 1%, the emissivity of an atmospheric window of 7-14 microns is about 75%, the solar band heat reflectivity is about 8%, and the glossiness is about 70 GU. Therefore, the glossiness of the radiation refrigeration composite film prepared by using the radiation refrigeration film reaches about 380GU, so that the radiation refrigeration composite film is seriously polluted in the using process.
Disclosure of Invention
In view of the above, there is a need to provide a radiation refrigeration film, a radiation refrigeration composite film, and a radiation refrigeration product; the radiation refrigeration film has excellent radiation refrigeration effect and low glossiness, and when the radiation refrigeration film is used in a radiation refrigeration composite film, the light pollution of the radiation refrigeration composite film in the using process can be effectively reduced, and the excellent radiation refrigeration effect is ensured.
The radiation refrigeration film comprises a substrate layer and a filler distributed in the substrate layer, wherein the refractive index of a material of the substrate layer is n, n is 1.3-1.7, the refractive index of the filler is m, the difference value of n and m is x, the absolute value of x is more than or equal to 0.05%, the emissivity of the radiation refrigeration film in an atmosphere window of 7-14 mu m is more than or equal to 80%, the heat reflectivity of a 300-2500 nm waveband is more than or equal to 10%, and the glossiness of the radiation refrigeration film is less than or equal to 20 GU.
In one embodiment, the glossiness is 9GU to 20 GU.
In one embodiment, the light transmittance of the radiation refrigeration film is more than or equal to 85 percent.
In one embodiment, the absolute value of x is between 0.05% and 0.2%.
In one embodiment, the material of the substrate layer comprises at least one of polyesters, polyacrylates, polyamides, polyurethanes, polyolefins, and fluorine resins.
In one embodiment, the material of the substrate layer comprises at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-1, 4-cyclohexanedimethanol, polycaprolactam, polyhexamethylene adipamide, polydodecalactam, polydecamide, polyethylene, polypropylene, poly-4-methyl-1-pentene, fluoroethylene propylene copolymer, acrylonitrile-butadiene-styrene plastic, polymethyl methacrylate, polyvinylidene fluoride, ethylene chlorotrifluoroethylene copolymer.
In one embodiment, the substrate layer includes cells therein.
In one embodiment, the mass percentage of the filler in the radiation refrigeration film is 2% to 5%.
In one embodiment, the filler has a particle size of 2 μm to 6 μm.
In one embodiment, the filler is an organic filler.
In one embodiment, the organic filler includes at least one of acrylate particles, polystyrene particles, polyurethane particles, polymethylmethacrylate particles, and epoxy particles.
In one embodiment, the organic filler has a melting point greater than the melting point of the material of the matrix layer.
In one embodiment, the filler is a hollow filler.
In one embodiment, the thickness of the radiation refrigeration film is more than or equal to 25 μm.
The radiation refrigeration composite film comprises the radiation refrigeration film, the glossiness of the radiation refrigeration composite film is less than or equal to 70GU, the emissivity of the radiation refrigeration composite film in an atmospheric window of 7-14 mu m is more than or equal to 80%, and the heat reflectivity of a wave band of 300-2500 nm is more than or equal to 85%.
In one embodiment, the glossiness of the radiation refrigeration composite film is 30 GU-70 GU.
In one embodiment, the radiation refrigeration composite film comprises a reflecting film, a second laminating layer and a radiation refrigeration film, wherein the second laminating layer and the radiation refrigeration film are sequentially arranged in a laminated mode, and the reflecting film comprises a reflecting layer.
In one embodiment, the reflective film comprises a first substrate layer, and a first laminating layer, a reflective layer and a second substrate layer which are sequentially laminated and arranged on the first substrate layer, wherein the second laminating layer is laminated and arranged on the second substrate layer, and the radiation refrigeration film is laminated and arranged on the second laminating layer.
In one embodiment, the thickness of the reflecting layer is 50nm to 400 nm;
and/or the thicknesses of the first substrate layer and the second substrate layer are independently selected from 15-50 μm;
and/or the thicknesses of the first lamination layer and the second lamination layer are independently selected from 2-15 μm.
In one embodiment, the material of the reflective layer is a metal material and/or a ceramic material.
In one embodiment, the material of the first substrate layer and the second substrate layer is independently selected from at least one of polyethylene naphthalate, 1, 4-cyclohexanedimethanol terephthalate, 1, 4-cyclohexanedimethanol polyethylene terephthalate, polyethylene glycol-acetate terephthalate, polycarbonate, acrylonitrile styrene copolymer, acrylonitrile-butadiene-styrene terpolymer, polyvinyl chloride, ethylene propylene diene monomer, polyolefin, polyamide, ethylene-vinyl acetate copolymer, and ethylene-methyl acrylate copolymer.
The utility model provides a radiation refrigeration goods, includes the base member and in proper order range upon range of set up in the third laminating layer on base member surface with radiation refrigeration complex film, just first substrate layer in the radiation refrigeration complex film with the laminating of third laminating layer.
In one embodiment, the substrate comprises at least one of metal, plastic, glass, rubber, asphalt, cement, textile.
In the radiation refrigeration film, the radiation refrigeration film has higher emissivity and reflectivity by selecting the material and the filler of the substrate layer and adjusting the relation of the refractive indexes of the substrate layer and the filler, and meanwhile, light rays can be refracted for multiple times in the film. Therefore, the radiation refrigeration film has excellent radiation refrigeration effect, high haze and low glossiness.
Furthermore, the radiation refrigeration composite film obtained based on the radiation refrigeration film has excellent radiation refrigeration effect and low surface gloss, and can effectively reduce light pollution in the use process when being applied to the fields of energy-saving building materials, photovoltaic industry, outdoor products and the like.
Drawings
FIG. 1 is a schematic structural diagram of a radiation-cooled film according to the present invention;
FIG. 2 is a schematic structural diagram of a composite radiation refrigeration membrane according to the present invention;
fig. 3 is a schematic diagram of the structure of a radiation-cooled article of the present invention.
In the figure: 10. a base; 11. a radiation refrigeration film; 12. a second adhesive layer; 13. a reflective film; 14. a third laminating layer; 111. a substrate layer; 112. a filler; 131. a first base material layer; 132. a first adhesive layer; 133. a reflective layer; 134. and a second substrate layer.
Detailed Description
The radiation refrigeration film, the radiation refrigeration composite film and the radiation refrigeration product provided by the invention are further explained below.
In the present invention, the measurement of gloss is based on the surface reflection of light relative to polished glass as a reference standard. Wherein the amount of light reflected on the surface depends on the angle of incidence and the properties of the surface. Gloss is classified as low gloss, semi-gloss, or high gloss. In the application, the glossiness of each product or sample is tested according to the national standard GB/T13891-2008, the sample is tested under the 60-degree geometric condition, and if the test result is greater than 70GU, the sample is further tested under the 20-degree geometric condition to improve the resolution degree of the sample. Correspondingly, if the test result is less than 10GU, the 85-degree geometric condition is adopted for further testing so as to improve the resolution degree. The results are 10GU to 70GU if the samples are tested using a 60 ℃ geometry, referred to as "half gloss", and "low gloss" if the results are less than 10 GU; if the result is greater than 70GU, it is referred to as "high gloss".
The radiation refrigeration film 11 provided by the invention comprises a substrate layer 111 and a filler 112 distributed in the substrate layer 111, wherein the refractive index of the material of the substrate layer 111 is n, n is 1.3-1.7, the refractive index of the filler 112 is m, the difference value between n and m is x, the absolute value of x is more than or equal to 0.05%, the emissivity of the radiation refrigeration film 11 in an atmospheric window of 7-14 mu m is more than or equal to 80%, the heat reflectivity of a wave band of 300-2500 nm is more than or equal to 10%, and the glossiness of the radiation refrigeration film 11 is less than or equal to 20 GU.
The refractive index n of the material of the base layer 111 may be larger than the refractive index m of the filler 112 or smaller than the refractive index m of the filler 112, but the absolute value of the difference x between the two must be equal to or greater than 0.05%.
Thus, the radiation refrigeration film 11 has high emissivity and reflectivity through the selection of the material of the base layer 111 and the filler 112. Meanwhile, by adjusting the relationship between the refractive indexes of the material of the base layer 111 and the filler 112, light can be refracted for multiple times in the film, so that the effects of improving the haze of the radiation refrigeration film 11 and reducing the glossiness of the radiation refrigeration film 11 are achieved.
Through further selection of the material of the matrix layer 111, the material of the filler 112 and the refractive index, the matching effect is better, and the glossiness of the radiation refrigeration film 11 can be 9 GU-20 GU.
Further, in order to ensure the reflectivity and emissivity of the radiation refrigeration film 11 when applied to a radiation refrigeration composite film, the light transmittance of the radiation refrigeration film 11 is not less than 85%.
In order to ensure the light transmittance of the radiation refrigeration film 11, and to ensure the emissivity and the film forming property of the radiation refrigeration film 11. The material of the substrate layer 111 includes at least one of polyesters, polyacrylates, polyamides, polyurethanes, polyolefins, and fluororesins. Further preferred are polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyethylene terephthalate-1, 4-cyclohexanedimethanol (PETG), polyethylene terephthalate-1, 4-cyclohexanedimethanol (PCTG), polycaprolactam (PA6), polyhexamethylene adipamide (PA66), polydodecalactam (PA12), polydecamethylene sebacamide (PA1010), at least one of Polyethylene (PE), Polypropylene (PC), poly-4-methyl-1-pentene (TPX), fluoroethylene propylene copolymer (FEP), acrylonitrile-butadiene-styrene plastic (ABS), polymethyl methacrylate (PMMA), polyvinylidene fluoride (PVDF), ethylene chlorotrifluoroethylene copolymer (ECTFE).
Further, the larger the refractive index difference x between the material of the base layer 111 and the filler 112 is, the stronger the ability of incident light to refract is, and the more significant the haze is. However, the larger the refractive index difference x, the more the filler 20 is selected to transition from an organic filler to an inorganic filler, and the use of an inorganic filler affects the light transmittance of the film. Therefore, the filler 20 is preferably an organic filler, and the absolute value of x is preferably 0.05% to 0.2%.
Further, the organic filler includes at least one of acrylate particles, polystyrene particles, polyurethane particles, polymethyl methacrylate particles, and epoxy resin particles.
It is understood that the radiation refrigerating film 11 of the present invention can be prepared by a melt blending method, specifically: is prepared by melt blending the material of the matrix layer 111 and the filler 112 after being mixed by a blending device.
It should be noted that in the radiation refrigerating film 11, the organic filler needs to be present in the form of particles so that the light can be refracted many times in the radiation refrigerating film 11. Therefore, the melting point of the organic filler is higher than that of the material of the substrate layer 111, so as to ensure that the organic filler is not melted when the radiation refrigeration film 11 is prepared by a melt blending method.
Specifically, the melt blending temperature is: within a range where the material of the base layer 111 is completely melted without being decomposed and the filler 112 is not melted.
In order to satisfy the relationship between the refractive index and the melting point at the same time, the material of the base layer 111 and the material of the filler 112 are preferably different materials. However, since the material of the base layer 111 and the material of the filler 112 are both polymer materials, the material of the base layer 111 and the material of the filler 112 may be the same material when the polymer materials are influenced by factors such as molecular weight and polymerization degree or modified so that the same polymer materials satisfy the relationship between the refractive index and the melting point of the material of the base layer 111 and the material of the filler 112 in the present invention.
In addition, if the particle size of the filler 112 is too small, the filler is likely to agglomerate in the base layer 111, and the effect of improving the haze is lost, whereas if the particle size is too large, the surface roughness of the radiation refrigeration film 11 is affected. Therefore, the particle diameter of the filler 112 is preferably 2 to 6 μm, and more preferably 3 to 5 μm.
The particle size of the filler 112 refers to an average particle size.
Meanwhile, considering that the haze limit of the radiation refrigeration film 11 is 90% -95%, the excessively high content of the filler 112 in the radiation refrigeration film 11 does not significantly improve the haze of the radiation refrigeration film 11, but also affects the surface roughness and the light transmittance of the radiation refrigeration film 11, and meanwhile, when the content of the filler 112 is excessive, the processability of the radiation refrigeration film 11 is also affected. Therefore, the mass percentage of the filler 112 in the radiation refrigeration film 11 is 2% to 5%.
Thus, by adjusting and matching the particle size and amount of the filler 112 and the refractive index of the material of the base layer 111, the radiation refrigeration film 11 having excellent radiation refrigeration effect and low glossiness is obtained.
Further, when the filler 112 is a hollow filler, the light can be refracted more times in the film, so that the haze of the radiation refrigeration film 11 can be further improved, and the gloss can be reduced.
Similarly, when the base layer 111 of the radiation refrigeration film 11 includes the cells, the light can be refracted in the film more times, so that the haze of the radiation refrigeration film 11 can be further improved, and the gloss can be reduced. Preferably, the size of the cells is the same as the particle size of the filler 20, preferably 2 μm to 6 μm, more preferably 3 μm to 5 μm.
Further, the cells may be obtained by adding a pore-forming agent including easily decomposable materials such as ammonium carbonate, ammonium bicarbonate and the like during preparation, decomposing and leaving cells in the matrix layer 10 upon melt blending.
Thus, the haze of the radiation refrigeration film 11 can be further improved and the glossiness of the radiation refrigeration film 11 can be reduced by providing cells in the base layer 111 and/or using the hollow filler 112.
Further, the thickness of the radiation cooling film 11 is preferably not less than 25 μm, considering that when the radiation cooling film 11 is too thin, the haze of the radiation cooling film 11 is difficult to be greatly improved. On the other hand, when the radiation refrigerating film 11 is too thick, the flexibility of the radiation refrigerating film 11 is affected, and the effect of the crease is easily produced in use. Therefore, the thickness of the radiation refrigerating film 11 is more preferably 25 μm to 100 μm.
The invention also provides a radiation refrigeration composite film which comprises the radiation refrigeration film 11, wherein the glossiness of the radiation refrigeration composite film is less than or equal to 70GU, the emissivity of an atmospheric window of 7-14 mu m is more than or equal to 80%, and the heat reflectivity of a wave band of 300-2500 nm is more than or equal to 85%.
Further, through the change of the glossiness of the radiation refrigeration film 11, the glossiness of the radiation refrigeration composite film is 30 GU-70 GU.
Therefore, the radiation refrigeration composite film obtained based on the radiation refrigeration film 11 has the characteristics of excellent radiation refrigeration effect, low surface glossiness and the like.
Further, the radiation refrigeration composite film comprises a reflecting film 13, and a second laminating layer 12 and a radiation refrigeration film 11 which are sequentially stacked.
The reflective film 13 includes a first substrate layer 131, and a first laminating layer 132, a reflective layer 133, and a second substrate layer 134 sequentially stacked on the first substrate layer 131, the second laminating layer 12 is stacked on the second substrate layer 134, and the radiation refrigeration film 11 is stacked on the second laminating layer 12. Accordingly, interlayer bonding is achieved through the first bonding layer 132 and the second bonding layer 12, adhesion of the radiation refrigeration composite film to the base is improved through the first substrate layer 131, and the reflective layer 133 is protected through the first substrate layer 131 and the second substrate layer 134.
The thickness of the reflective layer 133 is 50nm to 400nm, the thicknesses of the first substrate layer 131 and the second substrate layer 134 are independently selected from 15 μm to 50 μm, and the thicknesses of the first bonding layer 132 and the second bonding layer 12 are independently selected from 2 μm to 15 μm. It should be understood that the thicknesses of the first substrate layer 131 and the second substrate layer 134 may be the same as or different from each other. Also, the thicknesses of the first lamination layer 132 and the second lamination layer 12 may be the same as or different from each other.
Specifically, the material of the reflective layer 133 is a metal material and/or a ceramic material. The metal material is at least one of silver, silver alloy, aluminum alloy, gold alloy, copper and copper alloy; the ceramic material is metal oxide, metal nitride, non-metal nitride, or semiconductorAt least one of bulk dopant compounds, wherein the metal oxide comprises Y2O3、ZnO、SnO、Ta2O5、Nb2O5、ZrO2、HfO2The metal nitride includes Ti3N4AlN, and the non-metal nitride includes Si3N4The semiconductor doping compound comprises at least one of AZO, ITO, IZO, ZTO and GZO.
Specifically, the material of the first substrate layer 131 and the second substrate layer 134 is independently selected from at least one of polyethylene naphthalate, poly (1, 4-cyclohexanedimethanol terephthalate), poly (ethylene terephthalate-acetate), polycarbonate, acrylonitrile styrene copolymer, acrylonitrile-butadiene-styrene terpolymer, polyvinyl chloride, ethylene propylene diene monomer, polyolefin, polyamide, ethylene-vinyl acetate copolymer, and ethylene-methyl acrylate copolymer. It should be understood that the materials of the first substrate layer 131 and the second substrate layer 134 may be the same as or different from each other.
The invention also provides a radiation refrigeration product, which comprises a base body 10, and a third bonding layer 14 and a radiation refrigeration composite film which are sequentially stacked on the surface of the base body 10, wherein a first substrate layer 131 in the radiation refrigeration composite film is bonded with the third bonding layer 14.
Wherein the matrix comprises at least one of metal, plastic, glass, rubber, asphalt, cement, and textile.
It should be understood that the thicknesses of the third adhesive layer 14, the first adhesive layer 132 and the second adhesive layer 12 may be the same or different from each other.
Therefore, a product comprising the radiation refrigeration composite film is of a semi-gloss grade, so that the light pollution of the product in the using process is effectively reduced, and meanwhile, the radiation refrigeration composite film has an excellent radiation refrigeration effect.
Hereinafter, the radiation refrigeration film, the radiation refrigeration composite film, and the radiation refrigeration product will be further described by the following specific examples.
Example 1
In the radiation refrigeration film of the embodiment, the material of the matrix layer is PMMA, and the filler is PS microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.49%, the refractive index m of the filler is 1.58%, and the absolute value of the refractive index difference x is 0.09%. The thickness of the radiation refrigeration film is 50 micrometers, the grain diameter of a filler in the radiation refrigeration film is 3 micrometers, and the mass percentage is 2%.
Example 2
In the radiation refrigeration film of the embodiment, the base layer is made of PETG (polyethylene terephthalate glycol) and the filler is PMMA (polymethyl methacrylate) microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.48%, and the absolute value of the refractive index difference x is 0.06%. The thickness of the radiation refrigeration film is 50 μm, the grain diameter of the filler in the radiation refrigeration film is 5 μm, and the mass percentage is 5%.
Example 3
In the radiation refrigeration film of the embodiment, the base layer is made of PETG (polyethylene terephthalate glycol) and the filler is acrylate microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.43%, and the absolute value of the refractive index difference x is 0.11%. The thickness of the radiation refrigeration film is 50 μm, the grain diameter of the filler in the radiation refrigeration film is 3 μm, and the mass percentage is 3%.
Example 4
In the radiation refrigeration film of the embodiment, the material of the matrix layer is PMMA, and the filler is PS microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.49%, the refractive index m of the filler is 1.59%, and the absolute value of the refractive index difference x is 0.1%. The thickness of the radiation refrigeration film is 50 μm, the grain diameter of the filler in the radiation refrigeration film is 3 μm, and the mass percentage is 2%.
Example 5
In the radiation refrigeration film of the embodiment, the base layer is made of PETG (polyethylene terephthalate glycol) and the filler is PMMA (polymethyl methacrylate) microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.48%, and the absolute value of the refractive index difference x is 0.06%. The thickness of the radiation refrigeration film is 25 micrometers, the grain diameter of a filler in the radiation refrigeration film is 3 micrometers, and the mass percentage is 3%.
Example 6
In the radiation refrigeration film of the embodiment, the base layer is made of PETG (polyethylene terephthalate glycol) and the filler is PMMA (polymethyl methacrylate) microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.48%, and the absolute value of the refractive index difference x is 0.06%. The thickness of the radiation refrigeration film is 75 μm, the grain diameter of the filler in the radiation refrigeration film is 3 μm, and the mass percentage is 3%.
Example 7
In the radiation refrigeration film of the embodiment, the base layer is made of PETG (polyethylene terephthalate glycol) and the filler is PMMA (polymethyl methacrylate) microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.48%, and the absolute value of the refractive index difference x is 0.06%. The thickness of the radiation refrigeration film is 100 mu m, the grain diameter of the filler in the radiation refrigeration film is 3 mu m, and the mass percentage is 3%.
Example 8
In the radiation refrigeration film of the embodiment, the base layer is made of PETG (polyethylene terephthalate glycol) and the filler is PMMA (polymethyl methacrylate) microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.48%, and the absolute value of the refractive index difference x is 0.06%. The thickness of the radiation refrigeration film is 50 micrometers, the grain diameter of the filler in the radiation refrigeration film is 3 micrometers, the mass percentage is 3%, and the radiation refrigeration film comprises foam holes with the size of 3 micrometers.
Example 9
In the radiation refrigeration film of the embodiment, the base layer is made of PETG (polyethylene terephthalate glycol) and the filler is PMMA (polymethyl methacrylate) microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.48%, and the absolute value of the refractive index difference x is 0.06%. The thickness of the radiation refrigeration film is 50 μm, the grain diameter of the filler in the radiation refrigeration film is 3 μm, the mass percentage is 3%, and the filler is hollow filler.
Example 10
In the radiation refrigeration film of the embodiment, the base layer is made of PETG (polyethylene terephthalate glycol) and the filler is PMMA (polymethyl methacrylate) microspheres, and the radiation refrigeration film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.48%, and the absolute value of the refractive index difference x is 0.06%. The thickness of the radiation refrigeration film is 50 μm, the grain diameter of the filler in the radiation refrigeration film is 3 μm, the mass percentage is 3%, the filler is hollow filler, and the radiation refrigeration film also comprises foam holes with the size of 3 μm.
Comparative example 1:
the material of the film of this comparative example was 100% PETG and the thickness was 50 μm.
Comparative example 2:
in the film of the comparative example, the material of the substrate layer is PC, and the filler is PS microspheres, and the film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.59%, the refractive index m of the filler is 1.58%, and the absolute value of the refractive index difference x is 0.01%. The thickness of the film was 50 μm, and the particle size of the filler in the film was 3 μm, with a mass percentage of 2%.
Comparative example 3:
in the film of the comparative example, the base layer is made of PETG and the filler is PS microspheres, and the film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.58%, and the absolute value of the refractive index difference x is 0.04%. The thickness of the film was 50 μm, and the particle size of the filler in the film was 3 μm, with a mass percentage of 2%.
Comparative example 4:
in the film of the comparative example, the base layer is made of PET, the filler is acrylic acid microspheres, and the film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.65%, the refractive index m of the filler is 1.43%, and the absolute value of the refractive index difference x is 0.22%. The thickness of the film was 50 μm, and the particle size of the filler in the film was 3 μm, with a mass percentage of 2%.
Comparative example 5
In the film of the embodiment, the base layer is made of PETG and the filler is acrylic acid microspheres, and the film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.43%, and the absolute value of the refractive index difference x is 0.11%. The thickness of the film was 15 μm, and the particle size of the filler in the film was 3 μm, 3% by mass.
Comparative example 6
In the film of the embodiment, the base layer is made of PETG and the filler is acrylic acid microspheres, and the film is prepared by a melt blending method. Wherein the refractive index n of the material of the matrix layer is 1.54%, the refractive index m of the filler is 1.43%, and the absolute value of the refractive index difference x is 0.11%. The thickness of the film is 50 μm, the grain diameter of the filler in the film is 3 μm, and the mass percentage is 6%.
The films of examples 1 to 10 and the films of comparative examples 1 to 6 were subjected to performance tests, and the results are shown in table 1.
TABLE 1
Figure BDA0002353373150000141
Example 11:
the embodiment is a radiation refrigeration composite film, which includes a reflective film, a second adhesive layer and the radiation refrigeration film in embodiment 1, wherein the second adhesive layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 100 nm.
Example 12:
the embodiment is a radiation refrigeration composite film, which includes a reflective film, a second adhesive layer and the radiation refrigeration film of embodiment 2, wherein the second adhesive layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 100 nm.
Example 13:
the embodiment is a radiation refrigeration composite film, which includes a reflective film, a second adhesive layer and the radiation refrigeration film of embodiment 3, wherein the second adhesive layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 100 nm.
Example 14:
the embodiment is a radiation refrigeration composite film, which includes a reflective film, a second adhesive layer and the radiation refrigeration film of embodiment 4, wherein the second adhesive layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 200 nm.
Example 15
The embodiment is a radiation refrigeration composite film, which includes a reflective film, a second adhesive layer and the radiation refrigeration film of embodiment 5, wherein the second adhesive layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 100 nm.
Example 16
The embodiment is a radiation refrigeration composite film, which includes a reflective film, a second adhesive layer and the radiation refrigeration film of embodiment 6, wherein the second adhesive layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 150 nm.
Example 17
The embodiment is a radiation refrigeration composite film, which includes a reflective film, a second adhesive layer and the radiation refrigeration film of embodiment 7, wherein the second adhesive layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 400 nm.
Example 18
The embodiment is a radiation refrigeration composite film, which includes a reflective film, a second adhesive layer and the radiation refrigeration film of embodiment 8, wherein the second adhesive layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 400 nm.
Example 19
The embodiment is a radiation refrigeration composite film, which includes a reflective film, a second adhesive layer and the radiation refrigeration film of embodiment 9, wherein the second adhesive layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 250 nm.
Example 20
The embodiment is a radiation refrigeration composite film, the radiation refrigeration composite film includes a reflective film, a second laminating layer and the radiation refrigeration film of embodiment 10, the second laminating layer and the radiation refrigeration film are sequentially stacked, the reflective film includes a reflective layer, the reflective layer is made of a metal silver material, and the thickness of the reflective layer is 250 nm.
Comparative example 7:
the comparative example is a radiation refrigeration composite film, the radiation refrigeration composite film comprises a reflecting film, a second laminating layer and a radiation refrigeration film of the comparative example 1, the second laminating layer and the radiation refrigeration film are sequentially stacked, the reflecting film comprises a reflecting layer, the reflecting layer is made of a metal silver material, and the thickness of the reflecting layer is 250 nm.
Comparative example 8:
the comparative example is a radiation refrigeration composite film, the radiation refrigeration composite film comprises a reflecting film, a second laminating layer and a radiation refrigeration film of the comparative example 2, the second laminating layer and the radiation refrigeration film are sequentially stacked, the reflecting film comprises a reflecting layer, the reflecting layer is made of a metal silver material, and the thickness of the reflecting layer is 250 nm.
Comparative example 9:
the comparative example is a radiation refrigeration composite film, the radiation refrigeration composite film comprises a reflecting film, a second laminating layer and a radiation refrigeration film of the comparative example 3, the second laminating layer and the radiation refrigeration film are sequentially stacked, the reflecting film comprises a reflecting layer, the reflecting layer is made of a metal silver material, and the thickness of the reflecting layer is 250 nm.
Comparative example 10:
the comparative example is a radiation refrigeration composite film, the radiation refrigeration composite film comprises a reflecting film, a second laminating layer and a radiation refrigeration film of the comparative example 4, the second laminating layer and the radiation refrigeration film are sequentially stacked, the reflecting film comprises a reflecting layer, the reflecting layer is made of a metal silver material, and the thickness of the reflecting layer is 250 nm.
Comparative example 11
The comparative example is a radiation refrigeration composite film, the radiation refrigeration composite film comprises a reflecting film, a second laminating layer and a radiation refrigeration film of the comparative example 5, the second laminating layer and the radiation refrigeration film are sequentially stacked, the reflecting film comprises a reflecting layer, the reflecting layer is made of a metal silver material, and the thickness of the reflecting layer is 250 nm.
Comparative example 12
The comparative example is a radiation refrigeration composite film, the radiation refrigeration composite film comprises a reflecting film, a second laminating layer and a radiation refrigeration film of the comparative example 6, the second laminating layer and the radiation refrigeration film are sequentially stacked, the reflecting film comprises a reflecting layer, the reflecting layer is made of a metal silver material, and the thickness of the reflecting layer is 250 nm.
The products of examples 11 to 20 and the products of comparative examples 7 to 12 were subjected to performance tests, and the results are shown in table 2.
TABLE 2
Figure BDA0002353373150000171
In the above test results, "light transmittance" means transmittance in the visible light wavelength range of 300nm to 800nm, and thermal reflectance means reflectance in the visible light wavelength range of 300nm to 2500 nm.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (17)

1. The radiation refrigeration film is characterized by comprising a substrate layer and fillers distributed in the substrate layer, wherein the fillers are organic fillers, the mass percentage of the fillers is 2% -5%, the particle size of the fillers is 2-6 microns, the refractive index of materials of the substrate layer is n, n is 1.3-1.7, the refractive index of the fillers is m, the difference value of n and m is x, the absolute value of x is more than or equal to 0.05%, the emissivity of the radiation refrigeration film in an atmosphere window of 7-14 microns is more than or equal to 80%, the heat reflectivity of a wave band of 300-2500 nm is more than or equal to 10%, the glossiness of the radiation refrigeration film is less than or equal to 20GU, and the light transmittance of the wave band of 300-800 nm is more than or equal to 85%.
2. A radiation-curable film according to claim 1, wherein said gloss is 9GU to 20 GU.
3. A radiation-cooled film according to claim 1, wherein x has an absolute value of 0.05% to 0.2%.
4. A radiation refrigerating film according to claim 1, wherein the material of said base layer comprises at least one of polyester, polyacrylate, polyamide, polyurethane, polyolefin, and fluorine resin.
5. The radiation chilling film of claim 4, wherein the material of the substrate layer comprises at least one of polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene terephthalate-1, 4-cyclohexanedimethanol, polycaprolactam, polyhexamethylene adipamide, polydodecalactam, polydecamide, polyethylene, polypropylene, poly-4-methyl-1-pentene, vinyl fluoride propylene copolymer, acrylonitrile-butadiene-styrene plastic, polymethyl methacrylate, polyvinylidene fluoride, ethylene chlorotrifluoroethylene copolymer.
6. The film of claim 1, wherein the substrate layer comprises cells therein.
7. The radiation chilling film of claim 1, wherein the organic filler comprises at least one of acrylate particles, polystyrene particles, polyurethane particles, polymethylmethacrylate particles, epoxy particles.
8. The radiation chilling film of claim 1, wherein the organic filler has a melting point greater than the melting point of the material of the base layer.
9. A radiation-cooled film according to claim 1, wherein the filler is a hollow filler.
10. The radiation chilling film according to claim 1, wherein the thickness of the radiation chilling film is not less than 25 μm.
11. A radiation refrigeration composite film, which is characterized by comprising the radiation refrigeration film as claimed in any one of claims 1 to 10, wherein the glossiness of the radiation refrigeration composite film is less than or equal to 70GU, the emissivity of the radiation refrigeration composite film in an atmospheric window of 7-14 μm is more than or equal to 80%, and the heat reflectivity of the radiation refrigeration composite film in a wave band of 300-2500 nm is more than or equal to 85%.
12. The radiation refrigeration composite film according to claim 11, wherein the gloss of the radiation refrigeration composite film is 30GU to 70 GU.
13. The composite radiation refrigeration film of claim 11, wherein the composite radiation refrigeration film comprises a reflective film and a second conformable layer, a radiation refrigeration film, disposed in a stacked relationship in that order, wherein the reflective film comprises a reflective layer.
14. A composite radiation refrigerating film according to claim 13 wherein the thickness of the reflecting layer is 50nm to 400 nm.
15. A composite radiation cooling film according to claim 13 wherein the material of the reflective layer is a metallic and/or ceramic material.
16. A radiation refrigeration product is characterized by comprising a base body, a third laminating layer and the radiation refrigeration composite film, wherein the third laminating layer is sequentially arranged on the surface of the base body in a stacking mode, the radiation refrigeration composite film is as claimed in any one of claims 11 to 15, and a first base material layer in the radiation refrigeration composite film is laminated with the third laminating layer.
17. A radiation-cooled article according to claim 16, wherein the substrate comprises at least one of metal, plastic, glass, rubber, asphalt, cement, textile.
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