CN115572399B - Passive radiation cooling film and preparation method thereof - Google Patents
Passive radiation cooling film and preparation method thereof Download PDFInfo
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- CN115572399B CN115572399B CN202211225096.2A CN202211225096A CN115572399B CN 115572399 B CN115572399 B CN 115572399B CN 202211225096 A CN202211225096 A CN 202211225096A CN 115572399 B CN115572399 B CN 115572399B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D135/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least another carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D135/02—Homopolymers or copolymers of esters
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2435/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least one other carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Derivatives of such polymers
- C08J2435/02—Characterised by the use of homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
Abstract
The invention discloses a passive radiation cooling film and a preparation method thereof, and relates to the technical field of cooling, wherein hexagonal boron nitride microparticles and UV (ultraviolet) photo-curing glue are uniformly mixed to form a mixed solution; then, uniformly coating the mixed solution on a flexible polyethylene terephthalate (PET) substrate, and curing the mixed solution by ultraviolet irradiation to form a composite film; then, uniformly mixing the photoinitiator 184 with DPHA to form a DPHA precursor solution; and finally, uniformly coating the DPHA precursor solution on the surface of the composite film formed for the first time, and solidifying by ultraviolet irradiation to form the passive radiation cooling film. The radiation cooling film prepared by the invention has high total reflectance to sunlight, good passive radiation refrigerating effect, low cost and technical advantages of batch preparation, and wide application prospect.
Description
Technical Field
The invention relates to the technical field of cooling, in particular to a passive radiation cooling film and a preparation method thereof.
Background
The air conditioner refrigeration energy consumption in summer of the building accounts for about 15% of the total global energy consumption. Until 2014, researchers at the university of Stanford successfully realize zero-energy passive radiation refrigeration with the surface temperature lower than the ambient temperature under direct sunlight from the experimental level by using an expensive and complex nano-photon silver-plating passive radiation refrigerator, and the first time in human science history. The basic principle of the passive radiation cooling technology is as follows: most solar spectrum is scattered or reflected (0.3-2.5 μm), and simultaneously, the special spectral characteristics of the earth surface atmosphere are utilized to dissipate self heat to cold outer space through an atmospheric window with the wavelength of 8-13 μm, so that the cooling is realized. Therefore, the passive radiation cooling technology can realize spontaneous cooling of the surface of the object without consuming electric energy, and cannot cause environmental pollution, and is one of effective ways for solving the greenhouse effect. As an emerging passive refrigeration mode, the passive radiation cooling technology can be widely applied to photovoltaic arrays, building energy conservation and space detector temperature regulation, and has a large application potential in the global scope. However, the existing passive radiation cooling technology often needs to use complex and expensive processing equipment, and the preparation process is complex and difficult to popularize on a large scale. Moreover, the existing passive radiation cooling film is often added with a thinner aluminum film or silver film on the back of the cooling film to realize high-efficiency solar spectrum reflection, which also causes great obstacle to the practical application of the radiation cooling film, not only increases the manufacturing cost, but also inevitably causes light pollution.
Disclosure of Invention
In view of the above, the present invention aims to provide a passive radiation cooling film with simple manufacture and low cost and a preparation method thereof, which aims at overcoming the defects of the prior art. The passive radiation cooling film prepared by the method has higher solar spectral reflectivity and higher atmospheric window emissivity, and achieves the cooling effect of being lower than the ambient temperature by about 3.2 ℃ in hot summer.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a passive radiation cooling film which comprises a flexible polyethylene terephthalate (PET) substrate, an Ultraviolet (UV) light curing adhesive layer and a Dipentaerythritol Pentaacrylate (DPHA) film layer which are sequentially arranged from bottom to top, wherein hexagonal boron nitride microparticles are filled in the ultraviolet light curing adhesive layer.
Further, the thickness of the flexible PET substrate is 0.05-0.15 mm, the thickness of the ultraviolet light curing glue layer is 300-800 mu m, and the thickness of the dipentaerythritol pentaacrylate film layer is 100-500 mu m.
Further, the hexagonal boron nitride micron particle diameter is 1-8 μm.
The preparation method of the passive radiation cooling film comprises the following steps:
s1, preparing a mixed solution: uniformly mixing hexagonal boron nitride microparticles with the photo-curing adhesive to form a mixed solution;
s2, film formation for the first time: uniformly coating the mixed solution on a flexible PET substrate, and forming a composite film after light irradiation curing;
s3, preparing a precursor solution: uniformly mixing a photoinitiator and dipentaerythritol pentaacrylate to form dipentaerythritol pentaacrylate precursor solution;
s4, forming a film for the second time: uniformly coating the dipentaerythritol pentaacrylate precursor solution on the surface of the composite film formed for the first time, and carrying out ultraviolet irradiation curing.
Further, in the step S1, the volume ratio of the hexagonal boron nitride microparticles to the photo-curing adhesive is 5-10%.
Further, the photo-curing glue is an ultraviolet light curing glue.
Further, the volume ratio of the photoinitiator to dipentaerythritol pentaacrylate in the step S3 is 0.09-0.11, and the photoinitiator is preferably 1-hydroxy cyclohexyl phenyl ketone (photoinitiator 184).
The invention discloses the following technical effects:
the radiation cooling film prepared by the invention has high total reflectance to sunlight, good passive radiation refrigerating effect, low cost and technical advantages of batch preparation, and wide application prospect.
The passive radiation cooling film prepared by the method has higher solar spectral reflectivity and higher atmospheric window emissivity, the average total reflectivity is up to 90.7% in the wavelength range of 0.36-1.2 mu m, and the cooling effect lower than the ambient temperature by about 3.2 ℃ is realized in hot summer.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the structure of a passive radiation cooling film of example 1, wherein 1 is a flexible polyethylene terephthalate substrate, 2 is hexagonal boron nitride microparticles, 3 is an ultraviolet light cured adhesive layer, and 4 is a dipentaerythritol pentaacrylate film layer.
FIG. 2 is a flow chart of a method for preparing a passive radiation cooling film in example 1.
FIG. 3 is a scanning electron microscope image of a cross section of a passive radiation cooling film of example 1.
FIG. 4 is a graph of the solar spectral reflectance of the passive radiation cooled thin film of example 1.
Fig. 5 is a field diagram of a passive radiant cooling film outdoor test of example 1.
FIG. 6 is a graph showing the cooling effect of the passive radiation cooling film of example 1.
FIG. 7 is a graph showing the cooling effect of the passive radiation cooling film of example 2.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples of the present invention are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The embodiment of the invention provides a passive radiation cooling film, which comprises a flexible polyethylene terephthalate (PET) substrate 1, an Ultraviolet (UV) light curing adhesive layer 3 and a Dipentaerythritol Pentaacrylate (DPHA) film layer 4 which are sequentially arranged from bottom to top, wherein hexagonal boron nitride microparticles 2 are filled in the ultraviolet light curing adhesive layer 3.
In the embodiment of the invention, the thickness of the flexible PET substrate 1 is 0.05-0.15 mm, the thickness of the ultraviolet light curing glue layer 3 is 300-800 μm, and the thickness of the dipentaerythritol pentaacrylate film layer 4 is 100-500 μm.
In an embodiment of the present invention, hexagonal boron nitride microparticles have a diameter of 1 μm to 8 μm.
In an embodiment of the present invention, a method for preparing a passive radiation cooling film is provided, including the steps of:
s1, preparing a mixed solution: uniformly mixing hexagonal boron nitride microparticles with the photo-curing adhesive to form a mixed solution;
s2, film formation for the first time: uniformly coating the mixed solution on a flexible PET substrate, and forming a composite film after light irradiation curing;
s3, preparing a precursor solution: uniformly mixing a photoinitiator and dipentaerythritol pentaacrylate to form dipentaerythritol pentaacrylate precursor solution;
s4, forming a film for the second time: uniformly coating the dipentaerythritol pentaacrylate precursor solution on the surface of the composite film formed for the first time, and carrying out ultraviolet irradiation curing.
In the embodiment of the invention, the volume ratio of the hexagonal boron nitride micron particles to the photo-curing adhesive in the step S1 is 5-10%.
In an embodiment of the present invention, the photo-curable glue is an ultraviolet light curable glue.
In an embodiment of the present invention, the volume ratio of the photoinitiator to dipentaerythritol pentaacrylate in step S3 is 0.09 to 0.11, and the photoinitiator is preferably 1-hydroxycyclohexyl phenyl ketone (photoinitiator 184).
In the examples of the present invention, room temperature refers to 25.+ -. 2 ℃.
In embodiments of the present invention, the manner in which BEVS 1806B adjustable applicator operates is conventional in the art.
Example 1
The schematic structural diagram of the passive radiation cooling film in this embodiment is shown in fig. 1, and includes a flexible PET substrate 1, a UV light-curable adhesive layer 3 and a DPHA film layer 4 sequentially disposed from bottom to top, where the UV light-curable adhesive layer 3 is filled with hexagonal boron nitride microparticles 2.
The flow chart of the preparation method of the passive radiation cooling film in this embodiment is shown in fig. 2, and the specific preparation method is as follows:
s1, uniformly mixing hexagonal boron nitride micron particles 2 with UV light-cured glue to form a mixed solution: hexagonal boron nitride microparticles with an average diameter of 1 μm and UV light-cured glue (AA 3311) were mixed together in a volume ratio of 5% (i.e., hexagonal boron nitride microparticles account for 5% of the volume of UV light-cured glue), and stirred uniformly at room temperature to form a mixed liquid with uniform viscosity.
S2, forming a film for the first time, uniformly coating the mixed solution on a flexible PET substrate 1 with the thickness of 0.05mm, and curing by ultraviolet irradiation to form a composite film: the BEVS 1806B adjustable film coater is adopted, and the thickness of the film layer coating is set to be 300 mu m by adjusting the differential rule of the film coater. And (3) uniformly dripping the mixed solution prepared in the step (S1) on the flexible PET substrate (1) by adopting a plastic dropper, and scratching the flexible PET substrate (1) in a uniform manner so as to form a flat and uniform coating. The sample was then placed in an ultraviolet lamp box (365 nm,15 w) and exposed for 30min to form a cured flat composite film coating (i.e., UV photo-cured bondline 3), with hexagonal boron nitride microparticles 2 embedded inside the cured UV photo-cured bondline 3.
S3, preparing a precursor solution: uniformly mixing the photoinitiator 184 and DPHA to form a DPHA precursor solution, and measuring the photoinitiator 184 and DPHA according to a volume ratio of 0.09:1 are mixed in a glass container, uniformly stirred and sonicated for 10min, so that the photoinitiator 184 and DPHA are thoroughly mixed to form a DPHA precursor solution.
S4, forming a film for the second time: the DPHA precursor solution is uniformly coated on the surface of a composite film (namely a UV light curing adhesive layer 3) formed for the first time to form a DPHA film layer 4 with the thickness of 100 mu m, and a passive radiation cooling film is formed after ultraviolet irradiation curing.
The passive radiation cooling film prepared in this example was subjected to a cross-sectional Scanning Electron Microscope (SEM) test, and the test result is shown in fig. 3, and it can be seen from fig. 3 that hexagonal boron nitride microparticles having a diameter of about 1 μm have been embedded in the film. The total reflectance of the film to sunlight was further tested, and the result is shown in fig. 4. It can be seen from fig. 4 that the average total reflectance of the film prepared in this example is as high as 90.7% in the wavelength range of 0.36 μm to 1.2 μm. Outdoor temperature test (outdoor test site diagram is shown in fig. 5) is carried out on the actual radiation cooling effect of the embodiment, the test time is 2022, 6 months and 16 days, and the test site is 7 floors of the top of buildings without shielding in Huaian city of Jiangsu province: the average energy of sunlight at the current day of 11:00-13:30 noon is tested to be 760W/m 2 The wind speed was 2m/s and the relative humidity was 29%. The test box body is made of aluminum foil wrapped outside, and foam polymethyl methacrylate is filled in the middle of the test box body to avoid interference of heat convection and heat conduction of the external environment. The top of the box body is sealed by a low-density polyethylene film and is used as a window, the sample and the ambient temperature are recorded in real time by a K-type thermocouple, the test result is shown in figure 6, the temperature of the sample is 3.2 ℃ lower than the ambient temperature on average in a time period of 9:50-15:30, and a good cooling effect is realized in hot clear summer.
Example 2
The structure of the passive radiation cooling film of this embodiment is the same as that of embodiment 1.
The specific preparation method of the passive radiation cooling film in this embodiment is as follows:
s1, uniformly mixing hexagonal boron nitride micron particles 2 with UV light-cured glue to form a mixed solution: hexagonal boron nitride microparticles with an average diameter of 8 μm and UV light-curable glue (AA 3311) were mixed together at a volume ratio of 10%, and stirred uniformly at room temperature to give a uniform-viscosity mixed liquid.
S2, forming a film for the first time, uniformly coating the mixed solution on a flexible PET substrate 1 with the thickness of 0.015mm, and curing by ultraviolet irradiation to form a composite film: the BEVS 1806B adjustable film coater was used to set the film thickness of the film to 500 μm. The coating and curing process steps are the same as in example 1, and hexagonal boron nitride microparticles 2 are embedded in the cured UV photo-curing adhesive layer 3 after coating and curing.
S3, preparing a precursor solution: the photoinitiator 184 and DPHA are uniformly mixed to form a DPHA precursor solution, the photoinitiator 184 and DPHA are measured and mixed in a glass container according to the volume ratio of 0.11, and the uniformly mixed DPHA precursor solution is formed after stirring and ultrasonic treatment.
S4, forming a film for the second time: and uniformly coating the DPHA precursor solution on the surface of the composite film formed for the first time to form a DPHA film layer 4 with the thickness of 500 mu m, and curing by ultraviolet irradiation to form a passive radiation cooling film.
The film prepared in this example has an average total reflectance of 89.6% over the wavelength range of 0.36 μm to 1.2. Mu.m. The actual radiation cooling effect of the passive radiation cooling film prepared in this example was tested, and the outdoor temperature test conditions were the same as those in example 1, so that the samples of both examples could be placed in the same test box at the same time. The test result is shown in fig. 7, and in the time period of 9:50-15:30, the temperature of the sample is 2.9 ℃ lower than the average ambient temperature, and the good cooling effect is realized in hot clear summer, so that the preparation method has good application value.
Example 3
The structure of the passive radiation cooling film of this embodiment is the same as that of embodiment 1.
The specific preparation method of the passive radiation cooling film in this embodiment is as follows:
s1, uniformly mixing hexagonal boron nitride micron particles 2 with UV light-cured glue to form a mixed solution: hexagonal boron nitride microparticles with an average diameter of 8 μm and UV light-curable glue (AA 3311) were mixed together at a volume ratio of 10%, and stirred uniformly at room temperature to give a uniform-viscosity mixed liquid.
S2, forming a film for the first time, uniformly coating the mixed solution on the flexible PET substrate 1, and curing by ultraviolet irradiation to form a composite film: the BEVS 1806B adjustable film coater was used to set the film thickness of the film to 800 μm. The coating and curing process steps are the same as in example 1, and hexagonal boron nitride microparticles 2 are embedded in the cured UV photo-curing adhesive layer 3 after coating and curing.
S3, preparing a precursor solution: the photoinitiator 184 and DPHA are uniformly mixed to form a DPHA precursor solution, the photoinitiator 184 and DPHA are measured and mixed in a glass container according to the volume ratio of 0.11, and the uniformly mixed DPHA precursor solution is formed after stirring and ultrasonic treatment.
S4, forming a film for the second time: the DPHA precursor solution is uniformly coated on the surface of the composite film formed for the first time to form a DPHA film layer 4 with the thickness of 300 mu m, and the DPHA precursor solution is solidified by ultraviolet irradiation to form a radiation cooling film.
The film prepared in this example has an average total reflectance of 93.4% over the wavelength range of 0.36 μm to 1.2. Mu.m. The actual radiation cooling effect of the passive radiation cooling film prepared in the embodiment is tested, the outdoor temperature test conditions are the same as those in the embodiment 1, the average temperature of a sample is 3.5 ℃ lower than the ambient temperature in a time period of 9:50-15:30, and a good cooling effect is realized in hot clear summer, so that the preparation method has good application value.
Example 4
The structure of the passive radiation cooling film of this embodiment is the same as that of embodiment 1.
The specific preparation method of the passive radiation cooling film in this embodiment is as follows:
s1, uniformly mixing hexagonal boron nitride micron particles 2 with UV light-cured glue to form a mixed solution: hexagonal boron nitride microparticles with an average diameter of 1 μm and UV photo-curing glue (AA 3311) were mixed together in a volume ratio of 5%, and stirred uniformly at room temperature to form a uniform-viscosity mixed liquid.
S2, forming a film for the first time, uniformly coating the mixed solution on the flexible PET substrate 1, and curing by ultraviolet irradiation to form a composite film: the BEVS 1806B adjustable film coater is adopted, and the thickness of the film layer coating is set to be 300 mu m by adjusting the differential rule of the film coater. And (3) uniformly dripping the mixed solution prepared in the step (S1) on the flexible PET substrate (1) by adopting a plastic dropper, and scratching the flexible PET substrate (1) in a uniform manner so as to form a flat and uniform coating. The sample was then placed in an ultraviolet lamp box (365 nm,15 w) and exposed for 20min to form a cured flat composite film coating (i.e., UV photo-cured bondline 3), with hexagonal boron nitride microparticles 2 embedded inside the cured UV photo-cured bondline 3.
S3, preparing a precursor solution: the photoinitiator 184 and DPHA are evenly mixed to form a DPHA precursor solution, the photoinitiator 184 and DPHA are measured and mixed in a glass container according to the volume ratio of 0.09, evenly stirred and ultrasound is carried out for 10min, so that the photoinitiator 184 and DPHA are fully mixed to form the DPHA precursor solution.
S4, forming a film for the second time: the DPHA precursor solution is uniformly coated on the surface of a composite film (namely a UV light curing adhesive layer 3) formed for the first time to form a DPHA film layer 4 with the thickness of 400 mu m, and a passive radiation cooling film is formed after ultraviolet irradiation curing.
The film prepared in this example has an average total reflectance of 92.3% over the wavelength range of 0.36 μm to 1.2. Mu.m. The actual radiation cooling effect of the passive radiation cooling film prepared in the embodiment is tested, the outdoor temperature test conditions are the same as those in the embodiment 1, the average temperature of a sample is 3.3 ℃ lower than the ambient temperature in a time period of 9:50-15:30, and a good cooling effect is realized in hot clear summer, so that the preparation method has good application value.
Comparative example 1
The structure of the passive radiation cooling film of this embodiment is the same as that of embodiment 1.
The specific preparation method of the passive radiation cooling film in this embodiment is as follows:
s1, uniformly mixing hexagonal boron nitride micron particles 2 with UV light-cured glue to form a mixed solution: hexagonal boron nitride microparticles with an average diameter of 1 μm and UV photo-curing glue (AA 3311) were mixed together in a volume ratio of 5%, and stirred uniformly at room temperature to form a uniform-viscosity mixed liquid.
S2, forming a film for the first time, uniformly coating the mixed solution on the flexible PET substrate 1, and curing by ultraviolet irradiation to form a composite film: the BEVS 1806B adjustable film coater is adopted, and the thickness of the film layer coating is set to be 100 mu m by adjusting the differential rule of the film coater. And (3) uniformly dripping the mixed solution prepared in the step (S1) on the flexible PET substrate (1) by adopting a plastic dropper, and scratching the flexible PET substrate (1) in a uniform manner so as to form a flat and uniform coating. The sample was then placed in an ultraviolet lamp box (365 nm,15 w) and exposed for 10min to form a cured flat composite film coating (i.e., UV photo-cured bondline 3), with hexagonal boron nitride microparticles 2 embedded inside the cured UV photo-cured bondline 3.
S3, preparing a precursor solution: the photoinitiator 184 and DPHA are evenly mixed to form a DPHA precursor solution, the photoinitiator 184 and DPHA are measured and mixed in a glass container according to the volume ratio of 0.09, evenly stirred and ultrasound is carried out for 10min, so that the photoinitiator 184 and DPHA are fully mixed to form the DPHA precursor solution.
S4, forming a film for the second time: the DPHA precursor solution is uniformly coated on the surface of a composite film (namely a UV light curing adhesive layer 3) formed for the first time to form a DPHA film layer 4 with the thickness of 80 mu m, and a passive radiation cooling film is formed after ultraviolet irradiation curing.
The film prepared in this example has an average total reflectance of 72.5% over the wavelength range of 0.36 μm to 1.2. Mu.m. The actual radiation cooling effect of the passive radiation cooling film prepared in the embodiment is tested, the outdoor temperature test conditions are the same as those in the embodiment 1, and the temperature of the sample is 0.9 ℃ lower than the average ambient temperature within the time period of 9:50-15:30, so that the temperature of the sample does not have obvious cooling effect.
Comparative example 2
The structure of the passive radiation cooling film of this embodiment is the same as that of embodiment 1.
The specific preparation method of the passive radiation cooling film in this embodiment is as follows:
s1, uniformly mixing hexagonal boron nitride micron particles 2 with UV light-cured glue to form a mixed solution: hexagonal boron nitride microparticles with an average diameter of 15 μm and UV light-curable glue (AA 3311) were mixed together at a volume ratio of 5%, and stirred uniformly at room temperature to give a uniform-viscosity mixed liquid.
S2, forming a film for the first time, uniformly coating the mixed solution on the flexible PET substrate 1, and curing by ultraviolet irradiation to form a composite film: the BEVS 1806B adjustable film coater is adopted, and the thickness of the film layer coating is set to be 100 mu m by adjusting the differential rule of the film coater. And (3) uniformly dripping the mixed solution prepared in the step (S1) on the flexible PET substrate (1) by adopting a plastic dropper, and scratching the flexible PET substrate (1) in a uniform manner so as to form a flat and uniform coating. The sample was then placed in an ultraviolet lamp box (365 nm,15 w) and exposed for 10min to form a cured flat composite film coating (i.e., UV photo-cured bondline 3), with hexagonal boron nitride microparticles 2 embedded inside the cured UV photo-cured bondline 3.
S3, preparing a precursor solution: the photoinitiator 184 and DPHA are evenly mixed to form a DPHA precursor solution, the photoinitiator 184 and DPHA are measured and mixed in a glass container according to the volume ratio of 0.09, evenly stirred and ultrasound is carried out for 10min, so that the photoinitiator 184 and DPHA are fully mixed to form the DPHA precursor solution.
S4, forming a film for the second time: the DPHA precursor solution is uniformly coated on the surface of a composite film (namely a UV light curing adhesive layer 3) formed for the first time to form a DPHA film layer 4 with the thickness of 300 mu m, and a passive radiation cooling film is formed after ultraviolet irradiation curing.
The film prepared in this example has an average total reflectance of 74.5% over the wavelength range of 0.36 μm to 1.2. Mu.m. The actual radiation cooling effect of the passive radiation cooling film prepared in the embodiment is tested, the outdoor temperature test conditions are the same as those in the embodiment 1, the sample temperature is 1.1 ℃ lower than the ambient temperature in average in the time period of 9:50-15:30, and the temperature reduction effect is not obvious.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (5)
1. The passive radiation cooling film is characterized by comprising a flexible polyethylene terephthalate substrate (1), an ultraviolet light curing adhesive layer (3) and a dipentaerythritol pentaacrylate film layer (4) which are sequentially arranged from bottom to top, wherein hexagonal boron nitride microparticles (2) are filled in the ultraviolet light curing adhesive layer (3);
the thickness of the flexible polyethylene terephthalate substrate (1) is 0.05-0.15 mm, the thickness of the ultraviolet light curing adhesive layer (3) is 300-800 mu m, and the thickness of the dipentaerythritol pentaacrylate film layer (4) is 100-500 mu m;
the preparation method of the passive radiation cooling film comprises the following steps:
s1, preparing a mixed solution: uniformly mixing hexagonal boron nitride microparticles with the photo-curing adhesive to form a mixed solution;
s2, film formation for the first time: uniformly coating the mixed solution on a flexible polyethylene terephthalate substrate, and forming a composite film after light irradiation curing;
s3, preparing a precursor solution: uniformly mixing a photoinitiator and dipentaerythritol pentaacrylate to form dipentaerythritol pentaacrylate precursor solution;
s4, forming a film for the second time: uniformly coating the dipentaerythritol pentaacrylate precursor solution on the surface of the composite film formed for the first time, and carrying out light curing.
2. The passive radiation cooling film according to claim 1, wherein the hexagonal boron nitride micron particle diameter is 1 μm to 8 μm.
3. The passive radiation cooling film according to claim 1, wherein the volume ratio of hexagonal boron nitride microparticles to the photo-curing glue in step S1 is 5-10%.
4. A passive radiation cooled film as claimed in claim 3, wherein said photo-curable glue is an uv curable glue.
5. The passive radiation cooling film according to claim 1, wherein the volume ratio of the photoinitiator to dipentaerythritol pentaacrylate in the step S3 is 0.09-0.11.
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