Radiation refrigeration material and preparation method thereof

Abstract

The invention discloses a radiation refrigeration material and a preparation method thereof, and belongs to the technical field of radiation refrigeration. The radiation refrigeration material sequentially comprises a pigment coating and a reflecting film layer from top to bottom. In addition, the invention also provides a preparation method of the radiation refrigeration material, which comprises the following steps: coating the surface of the reflective film layer with a coating raw material containing a structural color pigment; the surface of the molecular coiled material is subjected to corona treatment to 45 dyn / cm or above, and the composite adhesive is coated; the back face of the reflecting film coated with the structural color pigment is attached to the gluing face of the macromolecule coiled material; the back surface of the polymer coiled material is subjected to corona treatment to be higher than 45 dyn / cm, self-adhesive glue is coated, and after drying, the release film layer continues to be attached; and the adhesive protective film layer is attached to the surface of the film material. According to the radiation refrigeration material provided by the invention, the color of the material is enriched while energy-consumption-free refrigeration is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of radiative cooling, and particularly relates to a radiative cooling material and a preparation method thereof. Background Art

[0002] Building energy consumption has become one of the largest energy consumptions in major countries in the world, accounting for 30-40% of the total energy consumption in developed countries. Among them, the energy consumption for air-conditioning refrigeration and heating accounts for 50% of the building energy consumption. Reducing the air-conditioning refrigeration energy consumption is of great significance for building energy conservation and green emission reduction.

[0003] Radiative cooling materials are a type of new energy-saving and environment-friendly materials, which can almost completely reflect solar radiation energy and at the same time radiate their own heat to the deep space of the universe through the atmospheric window. This technology can achieve cooling without additional energy consumption, thereby reducing building refrigeration energy consumption and realizing energy conservation and emission reduction. Although current radiative cooling materials have very good optical properties, their colors are single, unable to meet the market demand for aesthetics, and affecting the promotion of related markets. The richness of the material color is achieved by absorbing different parts of light in the visible light band. However, radiative cooling materials need to reflect sunlight as much as possible. The mutual restriction between the two results in a very small spectral adjustment range.

[0004] How to construct a new type of passive cooling metamaterial through new color and raw material realization methods, while ensuring zero-energy cooling, enriching the material color, and meeting the market demand for aesthetics is a technical problem that needs to be solved by the existing technology. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and provide a radiative cooling material and a preparation method thereof, so as to solve the technical problem in the existing technology of how to enrich the material color while ensuring zero-energy cooling.

[0006] To achieve the above technical purpose, the technical solution of the present invention provides a radiative cooling material, which sequentially includes from top to bottom: a pigment coating and a reflective film layer; the raw materials of the pigment coating include resin, filler, dispersant, leveling agent, defoaming agent, structural color pigment, solvent and curing agent.

[0007] In any embodiment, the raw materials of the pigment coating, calculated by mass percentage, include: 30wt%-50wt% of resin, 20wt%-40wt% of filler, 1-2wt% of dispersant, 0.5-0.8wt% of leveling agent, 1-1.5wt% of defoaming agent, 10wt%-20wt% of structural color pigment, 10wt%-15wt% of solvent, and 4-8wt% of curing agent.

[0008] In any embodiment, the filler is one or more of silica, barium sulfate, alumina, calcium carbonate, magnesium oxide, boron nitride, and glass micropowder; and / or, the resin is one or more of fluorocarbon resin, fluorosilicone resin, and silicone-modified acrylic resin; and / or, the structural color pigment is one or more of cellulose nanocrystal structural color pigment, multilayer film deposition photonic crystal structural color pigment, and silica sphere structural color pigment; and / or, the curing agent is an isocyanate curing agent.

[0009] In any embodiment, it further includes a composite adhesive layer and a coil layer. The composite adhesive layer is disposed below the reflective film layer, and the coil layer is disposed below the composite adhesive layer.

[0010] In any embodiment, it further includes a self-adhesive layer, and the self-adhesive layer is disposed below the coil layer.

[0011] In any embodiment, it further includes a release film layer, and the release film layer is disposed below the self-adhesive layer.

[0012] In any embodiment, the reflective film layer is one or more of a reflection-enhancing film layer, a bubble reflective film layer, a silver-plated film layer, and an aluminum-plated film layer.

[0013] In any embodiment, the thickness of the pigment coating is 30 - 60 μm; and / or, the thickness of the reflective film layer is 70 - 200 μm.

[0014] In any embodiment, a protective film layer is disposed above the pigment coating.

[0015] In addition, the present invention also provides a preparation method of the above-mentioned radiative cooling material, including the following steps:

[0016] Coat a coating raw material containing a structural color pigment on the surface of the reflective film layer;

[0017] Corona the molecular coil to more than 45 dyn / cm, and coat a composite adhesive;

[0018] Bond the back of the reflective film coated with the structural color pigment to the adhesive-coated surface of the polymer coil; corona the back of the polymer coil to more than 45 dyn / cm, coat a self-adhesive, and continue to bond the release film layer after drying; bond a protective film layer with adhesive on the surface of the film material.

[0019] Compared with the prior art, the beneficial effects of the present invention include: The radiation cooling material proposed by the present invention sequentially includes, from top to bottom: a pigment coating and a reflective film layer; the raw materials of the pigment coating include resin, filler, dispersant, leveling agent, defoaming agent, structural color pigment, solvent and curing agent; The topological structural color pigment is different from the pigment color. It is a color formed by optical processes such as interference, diffraction, and scattering between light and certain structures at the micro or nano scale, and basically does not involve the energy loss of light. Therefore, compared with traditional pigment colors, as long as the structure of the material remains unchanged, its color will not fade over time and can permanently maintain a bright color. The color formed by the structural color material can take into account the selectivity of the visible light spectrum adjustment of the radiation cooling material and reduce the solar absorptivity of the material surface. With the cooperation of other raw materials, the above problems can be well solved, while ensuring energy-free cooling, enriching the material color. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the radiation cooling material of Embodiment 1 of the present invention.

[0021] Description of the reference numerals: 1. Pigment coating; 2. Reflective film layer; 3. Composite adhesive layer; 4. Coil layer; 5. Self-adhesive layer; 6. Release film layer; 7. Protective film layer. Detailed Embodiments

[0022] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a specific range. The range defined in this way can include or not include the end values, and can be combined arbitrarily, that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, ranges of 60-110 and 80-120 are also contemplated. In addition, if the minimum range values 1 and 2 are listed, and if the maximum range values 3, 4, and 5 are listed, the following ranges are all contemplated: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In the present application, unless otherwise specified, the numerical range "a~b" represents an abbreviated representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0~5" means that all real numbers between "0~5" have been fully listed in this article, and "0~5" is only an abbreviated representation of these numerical combinations. In addition, when it is stated that a certain parameter is an integer ≥2, it is equivalent to disclosing that the parameter is, for example, the integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0023] Unless otherwise specified, the terms "comprising" and "including" mentioned in this application mean open-ended or closed-ended. For example, the terms "comprising" and "including" may mean that other components not listed may also be included or contained, or only the listed components may be included or contained.

[0024] Unless otherwise specified, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": A is true (or exists) and B is false (or does not exist); A is false (or does not exist) while B is true (or exists); or both A and B are true (or exist).

[0025] This specific embodiment provides a radiative cooling material, which sequentially includes, from top to bottom: a pigment coating and a reflective film layer.

[0026] In some embodiments, the raw materials of the pigment coating include resin, filler, dispersant, leveling agent, defoaming agent, structural color pigment, solvent, and curing agent; the raw materials of the pigment coating, calculated by mass percentage, include: resin 30wt%-50wt%, filler 20wt%-40wt%, dispersant 1-2wt%, leveling agent 0.5-0.8wt%, defoaming agent 1-1.5wt%, structural color pigment 10wt%-20wt%, solvent 10wt%-15wt%, isocyanate curing agent 4-8wt%; the filler is one or more of silica, barium sulfate, alumina, calcium carbonate, magnesium oxide, boron nitride, glass micro-powder; the resin is one or more of fluorocarbon resin, fluorosilicone resin, and silicone-modified acrylic resin; the structural color pigment is one or more of cellulose nanocrystal structural color pigment, multi-layer film deposited photonic crystal structural color pigment, and silica sphere structural color pigment; the curing agent is an isocyanate curing agent; the solvent is one or several of butyl acetate, propylene glycol methyl ether acetate, propylene glycol methyl ether, and dibasic acid ester.

[0027] In some embodiments, a composite adhesive layer and a coil layer are further included, and the composite adhesive layer and the coil layer are sequentially disposed below the reflective film layer.

[0028] In some embodiments, a self-adhesive layer is further included, and the self-adhesive layer is disposed below the coil layer.

[0029] In some embodiments, a release film layer is further included, and the release film layer is disposed below the self-adhesive layer.

[0030] In some embodiments, the reflective film layer is one or more of a reflection-enhancing film layer, a bubble reflective film layer, a silver-plated film layer, and an aluminum-plated film layer; and / or, the thickness of the pigment coating is 30 - 60 μm; and / or, the thickness of the reflective film layer is 70 - 200 μm.

[0031] In some embodiments, a protective film layer is provided above the pigment coating.

[0032] This specific embodiment also provides a preparation method of the above-mentioned radiative cooling material, including the following steps:

[0033] Coat the surface of the reflective film layer with a coating raw material containing structural color pigments;

[0034] Corona the surface of the molecular web to more than 45 dyn / cm, and coat it with a composite adhesive;

[0035] Bond the back surface of the reflective film coated with structural color pigments to the adhesive-coated surface of the polymer web; corona the back surface of the polymer web to more than 45 dyn / cm, coat it with a self-adhesive, and continue to bond the release film layer after drying; bond the adhesive-coated protective film layer to the surface of the film material.

[0036] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] In the present invention, terms such as "some embodiments", "this embodiment", and examples are used, which describe subsets of all possible embodiments. However, it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0038] If similar descriptions such as "first / second" appear in the application documents, the following description will be added. In the following description, the terms "first / second / third" only distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first / second / third" can be interchanged with a specific order or sequence when allowed, so that the embodiments described here can be implemented in an order other than that illustrated or described here.

[0039] In this embodiment, the term "and / or" only describes the association relationship of associated objects and represents three possible relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0040] The embodiments of the present application will be described below. The embodiments described below are exemplary and are only used to explain the present application, and should not be construed as a limitation to the present application. For those without specific technical or conditions noted in the embodiments, the techniques or conditions described in the literature in the field or according to the product specifications are followed. For the reagents or instruments without the manufacturer noted, they are all conventional products that can be obtained through commercial purchase.

[0041] The radiative cooling materials in the following embodiments or comparative examples are prepared according to the following steps:

[0042] S1. Coat a pigment coating on the surface of the reflective film, dry, and wind up.

[0043] S2. Corona the surface of the polymer coil to more than 45 dyn / cm, and coat a composite adhesive.

[0044] S3. Bond the coated side of the reflective film (back side) coated with structural color pigments to the adhesive-coated surface of the polymer coil.

[0045] S4. Corona the back side of the polymer coil to more than 45 dyn / cm, coat a self-adhesive, and bond a release film after drying.

[0046] S5. Bond a protective film with adhesive on the surface of the film material, and slit it into rolls of 20 - 60 m each.

[0047] Example 1

[0048] This example provides a radiative cooling material, which sequentially includes from top to bottom: a protective film layer 7, a pigment coating 1, a reflective film layer 2, a composite adhesive layer 3, a coil layer 4, a self-adhesive layer 5, and a release film layer 6.

[0049] The protective film layer is made of 20 g adhesion PE with a thickness of 25 μm; the pigment coating, calculated by mass percentage, includes: 38.5 wt% fluorosilicone resin, 20 wt% silica, 1 wt% dispersant BYK110, 0.5 wt% leveling agent BYK331, 1 wt% defoaming agent BYK104, 15 wt% green multi-layer film structural color pigment, 10 wt% butyl acetate, and 5 wt% isocyanate curing agent. The thickness of the pigment coating is 40 μm; the reflective film layer is made of 3M ESR with a thickness of 0.1 mm and a solar reflectance of 95.5%; the composite adhesive in the composite adhesive layer is polyurethane with a thickness of 20 μm; the coil layer is a homogeneous polyvinyl chloride layer with a thickness of 0.5 mm and a width of 1.51 m. When the reflective film layer is laminated with the polyvinyl chloride layer, a 5 mm overlap edge is reserved on one side; the self-adhesive layer is a butyl rubber layer with a thickness of 0.2 mm, and the release film layer is a 0.25 μm PET release film.

[0050] The radiative cooling material of this example is green, with a solar reflectance of 94.6%, an emissivity of 0.94 in the range of 8 - 13 μm, a water contact angle of 110° on the surface, and a surface gloss of 15 GU (60° angle).

[0051] Example 2

[0052] This example presents a radiative cooling material, which successively includes from top to bottom: a protective film layer, a pigment coating layer, a reflective film layer, a composite adhesive layer, a coil layer, a self-adhesive layer, and a release film layer.

[0053] The protective film layer selects 20g adhesion PE with a thickness of 25μm; the pigment coating layer, calculated by mass percentage, includes: 38.5wt% fluorosilicone resin, 20wt% silica, 1wt% dispersant BYK110, 0.5wt% leveling agent BYK331, 1wt% defoaming agent BYK104, 15wt% blue multilayer film structural color pigment, 10wt% propylene glycol methyl ether acetate, 5wt% isocyanate curing agent, and the thickness of the pigment coating layer is 40μm; the reflective film layer selects 3M ESR with a thickness of 0.1mm and a solar reflectivity of 95.5%; the composite adhesive in the composite adhesive layer is polyurethane with a thickness of 20μm; the coil layer is homogeneous polyvinyl chloride with a thickness of 0.5mm and a width of 1.51m. When the reflective film layer is compounded with the polyvinyl chloride layer, a 5mm lap joint is reserved on one side; the self-adhesive layer is a butyl rubber layer with a thickness of 0.2mm, and the release film layer is a 0.25μm PET release film.

[0054] The radiative cooling material of this example is blue, with a solar reflectivity of 94.1%, an emissivity of 0.94 in the range of 8 - 13μm, a water contact angle of 112° on the surface, and a surface gloss of 14GU (60° angle).

[0055] Example 3

[0056] This example presents a radiative cooling material, which successively includes from top to bottom: a protective film layer, a pigment coating layer, a reflective film layer, a composite adhesive layer, a coil layer, a self-adhesive layer, and a release film layer.

[0057] The protective film layer selects 20g adhesion PE with a thickness of 25μm; the pigment coating layer, calculated by mass percentage, includes: 38.5wt% fluorosilicone resin, 20wt% silica, 1wt% dispersant BYK110, 0.5wt% leveling agent BYK331, 1wt% defoaming agent BYK104, 15wt% green cellulose nanocrystal structural color pigment, 10wt% propylene glycol methyl ether, 5wt% isocyanate curing agent, and the thickness of the pigment coating layer is 40μm; the reflective film layer selects a 0.15mm thick white reflective film with a solar reflectivity of 95.1%; the composite adhesive in the composite adhesive layer is polyurethane with a thickness of 20μm; the coil layer is homogeneous polyvinyl chloride with a thickness of 0.3mm and a width of 1.51m. When the reflective film is compounded with the polyvinyl chloride layer, a 5mm lap joint is reserved on one side; the self-adhesive layer is a butyl rubber layer with a thickness of 0.2mm, and the release film layer is a 0.25μm PET release film.

[0058] The color radiative cooling material of this embodiment is green, with a solar reflectance of 94.3%, an emissivity of 0.93 in the range of 8 - 13 μm, a water contact angle of 110° on the surface, and a surface gloss of 18 GU (60° angle).

[0059] Example 4

[0060] This embodiment provides a radiative cooling material, which sequentially includes from top to bottom: a protective film layer, a pigment coating layer, a reflective film layer, a composite adhesive layer, a coil layer, a self - adhesive layer, and a release film layer.

[0061] The protective film layer selects 20g adhesion PE with a thickness of 25μm; the pigment coating layer, calculated by mass percentage, includes: 37.5wt% fluorosilicone resin, 30wt% alumina, 1wt% dispersant BYK110, 0.5wt% leveling agent BYK331, 1wt% defoaming agent BYK104, 15wt% blue multilayer film structural color pigment, 10wt% butyl acetate, and 6wt% isocyanate curing agent. The thickness of the pigment coating layer is 40μm; the reflective film layer selects 3M ESR with a thickness of 0.1mm and a solar reflectance of 95.5%; the composite adhesive in the composite adhesive layer is polyurethane with a thickness of 20μm; the coil layer is homogeneous polyvinyl chloride with a thickness of 1.5mm and a width of 1.51m. When the reflective film is laminated with the polyvinyl chloride layer, a 5mm overlapping edge is reserved on one side; the self - adhesive layer is a butyl rubber layer with a thickness of 0.2mm, and the release film layer is a 0.25μm PET release film.

[0062] The color radiative cooling material of this embodiment is green, with a solar reflectance of 94.1%, an emissivity of 0.94 in the range of 8 - 13 μm, a water contact angle of 110° on the surface, and a surface gloss of 14 GU (60° angle).

[0063] Example 5

[0064] This embodiment provides a radiative cooling material, which sequentially includes from top to bottom: a protective film layer, a pigment coating layer, a reflective film layer, a composite adhesive layer, a coil layer, a self - adhesive layer, and a release film layer.

[0065] The protective film layer is made of 20g adhesion PE with a thickness of 25μm; the pigment coating, calculated by mass percentage, includes: 37.5wt% silicone-modified acrylic resin, 30wt% barium sulfate, 1wt% dispersant BYK110, 0.5wt% leveling agent BYK331, 1wt% defoaming agent BYK104, 15wt% blue multi-layer film structural color pigment, 10wt% butyl acetate, 5wt% isocyanate curing agent, and the thickness of the pigment coating is 30μm; the reflective film layer is 0.1mm 3M ESR with a solar reflectance of 95.5%; the composite adhesive in the composite adhesive layer is polyurethane with a thickness of 20μm; the coil layer is homogeneous polyvinyl chloride with a thickness of 0.5mm and a width of 1.51m. When the reflective film is compounded with polyvinyl chloride, a 5mm overlapping edge is reserved on one side; the self-adhesive layer is a butyl rubber layer with a thickness of 0.2mm, and the release film layer is a 0.25μm PET release film.

[0066] The color radiant cooling self-adhesive waterproof coil of this embodiment is green, with a solar reflectance of 94.6%, an emissivity of 0.92 in the range of 8 - 13μm, a water contact angle of 108° on the surface, and a surface gloss of 12GU (60° angle).

[0067] Example 6

[0068] This embodiment provides a radiant cooling material, which sequentially includes from top to bottom: a protective film layer, a pigment coating, a reflective film layer, a composite adhesive layer, a coil layer, a self-adhesive layer, and a release film layer.

[0069] The protective film layer is made of 20g adhesion PE with a thickness of 25μm; the pigment coating, calculated by mass percentage, includes: 35wt% fluorosilicone resin, 27.5wt% silicon dioxide, 1wt% dispersant BYK110, 0.5wt% leveling agent BYK331, 1wt% defoaming agent BYK104, 20wt% blue multi-layer film structural color pigment, 10wt% butyl acetate, 5wt% isocyanate curing agent, and the thickness of the pigment coating is 50μm; the reflective film layer is 0.1mm thick 3M ESR with a solar reflectance of 95.5%; the composite adhesive in the composite adhesive layer is polyurethane with a thickness of 20μm; the coil layer is homogeneous polyvinyl chloride with a thickness of 1.0mm and a width of 1.51m. When the reflective film is compounded with polyvinyl chloride, a 5mm overlapping edge is reserved on one side; the self-adhesive layer is a butyl rubber layer with a thickness of 0.2mm, and the release film layer is a 0.25μm PET release film.

[0070] The color radiant cooling material of this embodiment is green, with a solar reflectance of 93.3%, an emissivity of 0.95 in the range of 8 - 13μm, a water contact angle of 112° on the surface, and a surface gloss of 10GU (60° angle).

[0071] The main differences between Example 2 and Example 1 are that the color of the structural color pigment in the coating is blue, and the solar reflectance and the emissivity in the 8 - 13μm atmospheric window of the prepared color radiative cooling material have changed; the main differences between Example 3 and Example 1 are that the type of the structural color pigment in the coating is cellulose nanocrystal, the reflective film is a 0.15mm white reflective film, and the PVC thickness is 0.3mm; the differences between Example 4 and Example 1 are that the filler in the coating is alumina with an addition amount of 30wt%, the reflective film is a 0.15mm white reflective film, and the PVC thickness is 1.5mm; the differences between Example 5 and Example 1 are that the resin in the coating is silicone - modified acrylic acid, the filler is barium sulfate, and the thickness of the resin in the color coating is 30μm; the differences between Example 6 and Example 1 are that the proportion of the filler in the coating increases, the proportion of the structural color pigment increases, the thickness of the coating is set to 50μm, and the PVC thickness is 1.5mm.

[0072] Comparative Example 1

[0073] This comparative example presents a radiative cooling material, which successively includes from top to bottom: a protective film layer, a pigment coating layer, a reflective film layer, a composite adhesive layer, a coil layer, a self - adhesive layer, and a release film layer.

[0074] The difference between this comparative example and Example 1 is that there is no filler in the pigment coating layer. Specifically, the pigment coating layer, calculated by mass percentage, includes: 58.5wt% fluorosilicone resin, 0wt% silica, 1wt% dispersant BYK110, 0.5wt% leveling agent BYK331, 1wt% defoaming agent BYK104, 15wt% green multi - layer film structural color pigment, 10wt% butyl acetate, and 5wt% isocyanate curing agent. The thickness of the pigment coating layer is set to 40μm.

[0075] The color radiative cooling material proposed in this comparative example is green, with a solar reflectance of 94.2%, an emissivity in the 8 - 13μm range of 0.83, a surface water contact angle of 110°, and a surface gloss of 100GU (60° angle).

[0076] Comparative Example 2

[0077] This comparative example presents a radiative cooling material, which successively includes from top to bottom: a protective film layer, a pigment coating layer, a reflective film layer, a composite adhesive layer, a coil layer, a self - adhesive layer, and a release film layer.

[0078] The difference between this comparative example and Example 1 is that the reflective film layer uses a 0.05mm - thick aluminized film.

[0079] The color radiative cooling material of this comparative example is green, with a solar reflectance of 87.6%, an emissivity in the 8 - 13μm range of 0.94, a surface water contact angle of 111°, and a surface gloss of 15GU (60° angle).

[0080] Comparative Example 3

[0081] This comparative example presents a radiative cooling material, which successively includes from top to bottom: a protective film layer, a pigment coating layer, a reflective film layer, a composite adhesive layer, a coil layer, a self-adhesive layer, and a release film layer.

[0082] The difference between this comparative example and Example 1 lies in that the thickness of the pigment coating layer is set to 10 μm.

[0083] The protective film selects 20g tacky PE with a thickness of 25 μm; the coating formulation: 38.5 wt% fluorosilicone resin, 20 wt% silica, 1 wt% dispersant BYK110, 0.5 wt% leveling agent BYK331, 1 wt% defoaming agent BYK104, 15 wt% green multi-layer film structural color pigment, 10 wt% solvent, 5 wt% isocyanate curing agent, and the thickness of the colored coating layer is set to 10 μm; the reflective film selects 0.1 mm 3M ESR with a solar reflectance of 95.5%; the composite adhesive selects polyurethane with a thickness of 20 μm; the coil is homogeneous polyvinyl chloride with a thickness of 0.5 mm and a width of 1.51 m. When the reflective film is compounded with polyvinyl chloride, a 5 mm overlapping edge is reserved on one side; the butyl rubber has a thickness of 0.2 mm, and the surface selects a 0.25 μm PET release film. The prepared colored radiative cooling self-adhesive waterproof coil is green, with a solar reflectance of 94.8%, an emissivity of 0.84 in the range of 8 - 13 μm, a water contact angle of 108° on the surface, and a surface gloss of 38 GU (60° angle).

[0084] Comparative Example 4

[0085] This comparative example presents a radiative cooling material, which successively includes from top to bottom: a protective film layer, a pigment coating layer, a reflective film layer, a composite adhesive layer, a coil layer, a self-adhesive layer, and a release film layer.

[0086] The difference between this comparative example and Example 1 lies in that the resin in the pigment coating layer is acrylic acid.

[0087] The colored radiative cooling material presented in this comparative example is green, with a solar reflectance of 94.4%, an emissivity of 0.94 in the range of 8 - 13 μm, a water contact angle of 92° on the surface, and a surface gloss of 14 GU (60° angle).

[0088] Comparative Example 5

[0089] This comparative example presents a radiative cooling material, which successively includes from top to bottom: a protective film layer, a pigment coating layer, a reflective film layer, a composite adhesive layer, a coil layer, a self-adhesive layer, and a release film layer.

[0090] The difference between this comparative example and Example 1 lies in that the filler in the coating selects titanium dioxide.

[0091] The color radiative cooling material proposed in this comparative example is green, with a solar reflectance of 88.2%, an emissivity of 0.93 in the 8 - 13μm range, a water contact angle of 113° on the surface, and a surface gloss of 42 GU (at a 60° angle).

[0092] Comparative Example 6

[0093] The radiative cooling material proposed in this comparative example includes, from top to bottom: a protective film layer, a pigment coating, a reflective film layer, a composite adhesive layer, a coil layer, a self - adhesive layer, and a release film layer.

[0094] The difference between this comparative example and Example 1 is that the thickness of the color coating is set to 100μm.

[0095] The color radiative cooling material proposed in this comparative example is green, with a solar reflectance of 80.6%, an emissivity of 0.94 in the 8 - 13μm range, a water contact angle of 110° on the surface, and a surface gloss of 15 GU (at a 60° angle).

[0096] Comparative Example 7

[0097] The radiative cooling material proposed in this comparative example includes, from top to bottom: a protective film layer, a pigment coating, a reflective film layer, a composite adhesive layer, a coil layer, a self - adhesive layer, and a release film layer.

[0098] The difference between this comparative example and Example 1 is that the color coating uses a common green pigment, which is BASF L9361.

[0099] The color radiative cooling material proposed in this comparative example is green, with a solar reflectance of 83.3%, an emissivity of 0.95 in the 8 - 13μm range, a water contact angle of 112° on the surface, and a surface gloss of 10 GU (at a 60° angle).

[0100] Comparative Example 8

[0101] The radiative cooling material proposed in this comparative example includes, from top to bottom: a protective film layer, a pigment coating, a reflective film layer, a composite adhesive layer, a coil layer, a self - adhesive layer, and a release film layer.

[0102] The difference between this comparative example and Example 1 is that no structural color pigment is added to the pigment coating.

[0103] The prepared radiative cooling material is white, with a solar reflectance of 95.3%, an emissivity of 0.93 in the 8 - 13μm range, a water contact angle of 112° on the surface, and a surface gloss of 10 GU (at a 60° angle).

[0104] The difference between Comparative Example 1 and Example 1 is that no filler is added to the coating, its emissivity in the 8 - 13μm atmospheric window is lower, and the surface gloss of the coating is larger.

[0105] The difference between Comparative Example 2 and Example 1 lies in that the reflective film is a 0.05 mm aluminized film. Since the solar reflectivity of the aluminized film is only 88.5%, the solar reflectivity of the finally prepared color radiant cooling waterproof coil is low.

[0106] The difference between Comparative Example 3 and Example 1 lies in that the thickness of the surface coating is set to 10 μm, resulting in a low emissivity of the atmospheric window of the finally prepared color radiant cooling waterproof coil and an unclear color.

[0107] The difference between Comparative Example 4 and Example 1 lies in that the resin in the coating is ordinary acrylic acid. The coating has a low water contact angle, no self-cleaning effect, and the weather resistance of the prepared color radiant cooling waterproof coil is poor.

[0108] The difference between Comparative Example 5 and Example 1 lies in that the filler in the coating is titanium dioxide. Due to the strong absorption of titanium dioxide in the ultraviolet region, the solar reflectivity of the prepared color radiant cooling waterproof coil is low.

[0109] The difference between Comparative Example 6 and Example 1 lies in that the thickness of the color coating is set to 100 μm. Since the surface coating is too thick, the light transmittance of the coating is low, and the optical properties are determined by the surface coating, resulting in a low solar reflectivity of the prepared color radiant cooling waterproof coil.

[0110] The difference between Comparative Example 7 and Example 1 lies in that the color coating uses ordinary green pigment. Due to the selective absorption of chemical color in visible light, the solar reflectivity of the prepared color radiant cooling waterproof coil is low.

[0111] The difference between Comparative Example 8 and Example 1 lies in that no structural color pigment is added to the color. The prepared color radiant cooling waterproof coil has a high solar emissivity and an emissivity of the atmospheric window, and the appearance is white.

[0112] Cooling tests of examples and comparative examples

[0113] Related tests:

[0114] Temperature test method: The water tank test is adopted. The size of the water tank is 600 mm * 400 mm * 40 mm, the material is stainless steel, and it is filled with water. The probe uses a K-type thermocouple, and the probe is located at the center of the water tank. A data multi-channel data recorder is used to record the temperature data. The probe is calibrated before the test, with a deviation of ±1 °C. The water tanks are placed on the same horizontal plane and in the same orientation. To prevent the influence of ground heat transfer, the water tanks are placed on 10 cm thick extruded polystyrene boards. The atmospheric temperature and solar irradiance data are obtained from a meteorological station near the test area. The coils of Examples 1-6 and Comparative Examples 1-8 are attached to the outer surface of the water tank, and the edges are sealed with tape all around. The outer surface of the water tank without attaching the coil is used as the control group. The ambient temperature is 30 °C, and under an average solar irradiance of 800 w / m 2Under the conditions, the water temperatures in the water tanks corresponding to the coils of different embodiments and comparative examples were tested, as shown in Table 1 below.

[0115] Table 1

[0116]

[0117] As can be seen from Table 1, the radiation cooling material proposed by the present invention has an obvious cooling effect.

[0118] The colored radiation cooling material of the present invention has the following functions: 1. High mid- and far-infrared spectral emissivity; 2. High solar reflectivity; 3. Color selectable; 4. Self-adhesive; 5. Waterproof.

[0119] Other beneficial effects also include:

[0120] Presenting color: The color comes from the structural color pigments added in the coating.

[0121] High solar reflectivity: The high solar reflectivity comes from the anti-color film layer adopted. The structural color pigments have less absorption of visible light, and the coil can still maintain a high solar reflectivity.

[0122] High emissivity: It comes from the added silica, barium sulfate, and alumina fillers.

[0123] Weather resistance and self-cleaning: It comes from fluorosilicone resin or fluorosilicone-modified resin.

[0124] Mechanical strength and waterproofness: It comes from the polymer coil.

[0125] Self-adhesive: It comes from the butyl rubber on the back of the polymer coil.

[0126] By using the above materials in combination, the radiation cooling material in the present invention is prepared, which can be used on cement roofs and color steel roofs to play a role in waterproofing and cooling. It should be noted that when used in the case of a color steel roof, the thickness of the radiation cooling material should not be greater than 1.0 mm to better fit the curved tile surface of the color steel.

[0127] The specific embodiments of the present invention described above do not constitute a limitation to the protection scope of the present invention. Any other corresponding changes and deformations made according to the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A radiation cooling material, characterized in that: It includes, from top to bottom, a pigment coating layer and a reflective film layer; the raw materials of the pigment coating layer include resin, filler, dispersant, leveling agent, defoamer, structural color pigment, solvent and curing agent.

2. The radiation cooling material according to claim 1, characterized in that: The raw materials of the pigment coating, calculated by mass percentage, include: 30wt%-50wt% of resin, 20wt%-40wt% of filler, 1-2wt% of dispersant, 0.5-0.8wt% of leveling agent, 1-1.5wt% of defoamer, 10wt%-20wt% of structural color pigment, 10wt%-15wt% of solvent, and 4-8wt% of curing agent.

3. The radiation cooling material according to claim 2, characterized in that: The filler is one or more of silicon dioxide, barium sulfate, aluminum oxide, calcium carbonate, magnesium oxide, boron nitride, and glass powder; and / or the resin is one or more of fluorocarbon resin, fluorosilicone resin, and silicone-modified acrylic resin; and / or the structural color pigment is one or more of cellulose nanocrystal structural color pigment, multilayer film deposited photonic crystal structural color pigment, and silica bead structural color pigment; and / or the curing agent is an isocyanate curing agent.

4. The radiation cooling material according to claim 1, characterized in that: It also includes a composite adhesive layer and a coiled material layer. The composite adhesive layer is arranged below the reflective film layer, and the coiled material layer is arranged below the composite adhesive layer.

5. The radiation cooling material according to claim 4, characterized in that: It also includes a self-adhesive layer, which is arranged below the coiled material layer.

6. The radiation cooling material according to claim 5, characterized in that: It also includes a release film layer, which is arranged below the self-adhesive layer.

7. The radiation cooling material according to claim 1, characterized in that: The reflective film layer is one or more of a reflection enhancement film layer, a bubble reflective film layer, a silver-plated film layer and an aluminum-plated film layer.

8. The radiation cooling material according to claim 1, characterized in that: The pigment coating has a thickness of 30-60 μm; and / or the reflective film layer has a thickness of 70-200 μm.

9. The radiation cooling material according to claim 7, characterized in that: A protective film layer is arranged above the pigment coating.

10. A method for preparing the radiation cooling material according to claim 9, characterized in that: The following steps are involved: The surface of the reflective film layer is coated with a coating material containing a structural color pigment; The surface of the molecular coil is corona-treated to above 45 dyn / cm, and then coated with composite adhesive; The back side of the reflective film coated with the structural color pigment is bonded to the adhesive coated side of the polymer coil; The back side of the polymer coil is corona treated to above 45 dyn / cm, and then coated with self-adhesive. After drying, the release film layer is laminated thereon; the surface of the film is laminated with an adhesive protective film layer.

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