CN110305539B - Day and night dual-efficiency radiation cooler and preparation method thereof - Google Patents
Day and night dual-efficiency radiation cooler and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a day and night dual-efficiency radiation cooler and a preparation method thereof, and the cooler consists of a broad-spectrum strong-reflection type metal substrate and an infrared strong-selective radiation coating with the thickness of 8-14 mu m coated on the surface of the substrate; wherein the 8-14 μm infrared strong selective radiation coating consists of a visible-infrared transparent polymer and an infrared strong selective radiation active nano functional composition with 8-14 μm infrared strong selective radiation, and the mass content of the visible-infrared transparent polymer is 10-80%; the 8-14 mu m infrared strong selective radiation active nano functional composition is composed of nano silicon dioxide, a rare earth silicate compound and a molybdate compound according to the mass ratio of 1 (0.5-2) to 0.5-2. The radiation cooler disclosed by the invention has excellent sunlight reflection and high radiation characteristic of 8-14 microns, can perform a high-efficiency autonomous cooling function under the conditions of sunlight irradiation and no sunlight irradiation, can be used for zero-energy-consumption cooling of facilities and devices such as buildings, grain and oil depots, high-power electronic equipment and refrigerated cases, and has a potential huge energy-saving effect.
Description
Technical Field
The invention belongs to the technical field of thermal radiation, and particularly relates to a day and night dual-effect energy radiation cooler and a preparation method thereof.
Background
Along with the rapid development of global economy, the problem of energy crisis is obvious day by day, the air-conditioning cooling occupies a considerable proportion in energy consumption, the development of high-efficiency radiation cooling technology has important significance for reducing electric energy consumption and protecting the environment. The radiation cooling refers to a process that objects on the earth transmit heat to outer space through an infrared atmospheric window, and the radiation cooling material is a material with a spontaneous cooling function prepared based on the principle. During heat propagation, the atmosphere is the primary transmission medium for infrared radiation, and although the atmosphere is transparent to visible light, a significant portion of the infrared radiation in the infrared band is not transmitted through the atmosphere. This is due to the atmospherePresence of H2O、CO2、O3And CH4The polyatomic gas molecules can cause the change of electric dipole distance in the molecules in the infrared radiation transmission process, so that the infrared radiation is absorbed or scattered, and in the actual atmosphere, a plurality of solid or liquid suspended matters such as smoke, fog, rain, snow, dust and the like also can block the transmission of the infrared radiation. According to the research on the atmospheric transmittance, it is found that the absorption of various gas molecules in the wave band of 8-14 μm is weak, and infrared radiation can be transmitted to a far distance through the atmospheric layer, so that the region is called as an atmospheric window.
In the solar illumination environment, the heat exchange of the radiation cooler in the working process mainly comprises the following steps: first, absorbed solar radiation; secondly, infrared radiation in the atmosphere is absorbed; third, infrared radiation emitted through the infrared window; fourth, heat convection and heat conduction under natural air. In order to achieve the best passive cooling effect, the radiation cooling material needs to have high emissivity in an infrared band of 8-14 μm and high reflectivity in a solar spectrum band of 0.38-2.5 μm. The radiation cooler generally comprises an infrared radiation layer and a sunlight reflection layer, wherein the infrared radiation layer is used for discharging heat of an object to the space through an infrared atmospheric window, and the sunlight reflection layer is used for efficiently reflecting sunlight and reducing sunlight heat absorption.
At present, the radiation cooler under the condition of no illumination at night is realized, but the high-performance radiation cooler meeting the requirement of practical performance under the condition of illumination at daytime is not yet appeared. The radiation cooler reported in the prior publication mainly comprises the following methods: one is to construct a radiation cooler with a nano structure by a photoetching technology and a nano plasma deposition technology, the photon radiation cooler with the structure has high manufacturing cost, cannot realize large-scale production, and has low structural strength, easy damage and poor long-term stability. The other method is to bond inorganic functional substances such as titanium dioxide, glass microspheres and the like and polymers on a high-reflection metal substrate in a compounding manner to obtain the radiation cooler, but because the absorption selectivity of the functional substances such as the titanium dioxide, the glass microspheres and the like in an infrared spectrum region is not enough, the prepared radiation cooler has high absorption rate and emissivity in a non-infrared atmospheric window outside the range of 8-14 mu m, has poor selective radiation capability, is easy to absorb a large amount of extra atmospheric thermal radiation from the environment, further weakens the overall cooling effect of a radiator, and has unsatisfactory effective cooling power. At present, a day and night dual-efficiency radiation cooler which can be used in the daytime and in the dark environment and can be manufactured in a large scale at low cost and a preparation method thereof are not reported.
Disclosure of Invention
The invention aims to provide a day and night double-effect radiation cooler which can solve the defects in the prior art, and the invention also aims to provide a preparation method of the day and night double-effect radiation cooler.
The technical scheme of the invention is as follows: a day and night dual-effect energy radiation cooler is characterized by consisting of a broad-spectrum strong reflection type metal substrate and an 8-14 mu m infrared strong selective radiation coating coated on the surface of the substrate; wherein, the wide-spectrum strong reflection type metallic substrate is a metal aluminum film or an aluminum plating polymer film with visible-infrared reflection more than 95 percent; the 8-14 mu m infrared strong selective radiation coating consists of a visible-infrared transparent polymer and an 8-14 mu m infrared strong selective radiation active nano functional composition, wherein the mass content of the visible-infrared transparent polymer in the 8-14 mu m infrared strong selective radiation coating is 10-80%, and the 8-14 mu m infrared strong selective radiation active nano functional composition consists of nano silicon dioxide, a rare earth silicate compound and a molybdate compound according to the mass ratio of 1 (0.5-2) to 0.5-2; the stoichiometric ratio of the rare earth silicate compound is SiO2-(0.5～2.0)RE2O3-(0.1～1.0)Na2O and RE are any one or a combination of more of La, Sm, Eu, Gd, Tb, Dy, Er, Tm, Yb, Y or Sc; the molecular formula of the molybdate compound is RMoO4And R is any one of alkaline earth metal elements Mg, Ca, Sr or Ba.
The functional powder composition is transparent to sunlight in an ultraviolet-visible-near infrared region, the contained silicon dioxide has strong selective absorption/radiation performance in a spectral region of 8-10 mu m, the rare earth silicate compound has strong selective absorption/radiation performance in a spectral region of 9-12 mu m, and the molybdate compound has strong selective absorption/radiation performance in a spectral region of 10-14 mu m.
Preferably, the visible-infrared transparent polymer is Polyethylene (PE) or poly-4-methylpentene-1 (TPX) resin
Any one of them.
Preferably, the thickness of the high infrared selective radiation coating with the thickness of 8-14 mu m is 5-30 mu m.
Preferably, the nano rare earth silicate oxide is prepared by the following method: accurately weighing nano silicon dioxide, rare earth nitrate and sodium nitrate according to the stoichiometric ratio of the rare earth silicate compound, and mixing and dispersing the nano silicon dioxide, the rare earth nitrate and the sodium nitrate into an ethanol-water mixed solution; evaporating the solvent under the condition of stirring in a water bath at the temperature of 70-80 ℃ to obtain gel; and after low-temperature pre-sintering treatment at 120-150 ℃ for 3-6 hours, performing heat treatment at 600-900 ℃ for 3-12 hours to obtain the rare earth silicate compound.
Preferably, the nano molybdate compound is prepared by the following method: according to the stoichiometric ratio of the molybdate compound, accurately weighing ammonium molybdate and alkaline earth metal nitrate, and dissolving the ammonium molybdate and the alkaline earth metal nitrate into deionized water; preparing a citric acid solution with the mass concentration of 5-10%, stirring and dripping the citric acid solution into the solution, adjusting the pH to 3.0-4.0, and evaporating the solvent under the condition of stirring in a water bath at the temperature of 70-80 ℃ to obtain gel; and pre-sintering at the low temperature of 120-150 ℃ for 3-6 hours, and then performing heat treatment at the temperature of 800-1000 ℃ for 3-12 hours to obtain the molybdate compound.
The invention also provides a method for preparing the day and night dual-effect radiation cooler, which comprises the following specific steps:
(a) weighing a certain amount of TPX or PE resin and a trichloroethylene organic solvent to be mixed according to the mass ratio of the visible-infrared transparent polymer to the organic solvent being 1 (40-55), and heating and dissolving in a water bath at 55 +/-5 ℃ to obtain a polymer resin solution;
(b) weighing a certain amount of nano silicon dioxide, rare earth silicate compound and molybdate compound according to the mass proportion of the nano functional powder composition;
(c) adding the functional powder composition prepared in the step (b) into the polymer resin solution prepared in the step (a) according to the mass content of the visible-infrared transparent polymer in the infrared strong selective radiation coating, and treating for 2-6 hours under the condition of 300-400 r/min by using a high-speed grinding dispersion machine to obtain functional slurry required by preparing the infrared strong selective radiation coating;
(d) and (c) coating the functional slurry obtained in the step (c) on the surface of a clean metal aluminum film or an aluminum-plated polymer film, drying and curing to obtain the required day and night dual-effect radiation cooler.
Preferably, the temperature of the water bath in the step (a) is 50-60 ℃.
Has the advantages that:
according to the invention, nano silicon dioxide, rare earth silicate compound and molybdate compound functional powder with different infrared absorption/radiation characteristics are combined according to a certain mass ratio, so that an ideal infrared strong selective absorption/radiation characteristic is obtained in an atmosphere window area of 8-14 mu m. The radiation cooler is simple in preparation method, has excellent ultraviolet-visible-near infrared high reflection and strong infrared selective absorption radiation characteristics of 8-14 mu m, can realize a high-efficiency autonomous radiation cooling function under the conditions of sunlight irradiation and no sunlight irradiation, and provides a new technical approach for zero-energy-consumption cooling and energy saving of facilities and devices such as buildings, grain and oil depots, high-power electronic equipment, cold storage bags and the like.
Detailed Description
For a better understanding of the present invention, the following examples are given as specific examples to illustrate the present invention, but the present invention is by no means limited to the following examples. The advantages and features of the invention will become more apparent from the description, but are not to be taken as limiting the invention in any way. It will be appreciated by those skilled in the art that various equivalent modifications and alterations of the invention are possible within the scope of the invention, as those skilled in the art will appreciate after reading the present disclosure.
Example 1
The embodiment discloses a day and night dual-efficiency radiation cooler and a preparation method thereof, and the preparation method comprises the following steps:
(1) according to the stoichiometric ratio SiO of rare earth lanthanum silicate compound2-La2O3-0.5Na2And O, accurately weighing a certain amount of nano silicon dioxide, lanthanum nitrate and sodium nitrate, dissolving into an ethanol-water mixed solution, evaporating the solvent under the stirring condition of a water bath at 70 ℃ to obtain gel, performing heat treatment at 150 ℃ for 3 hours to obtain rare earth lanthanum silicate pre-sintering powder, and performing heat treatment at 850 ℃ for 6 hours to obtain rare earth lanthanum silicate powder with the average particle size of 125 nm.
(2) Accurately weighing the required Ca (NO) according to the stoichiometric ratio of calcium molybdate3)2And ammonium molybdate, dissolved in deionized water. Preparing 8% citric acid solution, dropwise adding a small amount of the citric acid solution into the solution while vigorously stirring, adjusting the pH to 3.5 with ammonia water, evaporating the solvent under the stirring condition of water bath at 70 ℃ to obtain gel, performing heat treatment at 150 ℃ for 3 hours to obtain calcium molybdate pre-sintered powder, and performing heat treatment at 800 ℃ for 12 hours to obtain calcium molybdate powder with the average particle size of 100 nm.
(3) 2.5g of TPX particles are weighed according to the mass ratio of 1:40 of the TPX polymer to the trichloroethylene, and dissolved in 100g (66.7mL) of trichloroethylene in a water bath at the temperature of 50 ℃ to obtain a TPX resin solution.
(4) Respectively weighing 0.7g of nano silicon dioxide (50nm, sold on the market), 0.7g of rare earth lanthanum silicate powder in the step (1) and 0.7g of calcium molybdate powder in the step (2) according to the weight ratio of the functional powder composition of 1:1:1, adding the powder and 102.5g of TPX resin solution prepared in the step (3) into a high-speed grinding dispersion machine, and processing for 6 hours at the ball-milling rotating speed of 300 r/min to obtain functional slurry required by preparing the infrared strong selective radiation coating.
(5) And (4) coating the functional slurry prepared in the step (4) on an aluminum film (with the reflectivity of 97 percent, sold in the market) by using a coating machine according to the thickness dimension of 30 mu m to prepare a film, and naturally drying to obtain the required day and night dual-effect energy radiation cooler. The maximum temperature of the radiator can reach 12 ℃ day and night.
Example 2
The embodiment discloses a day and night dual-efficiency radiation cooler and a preparation method thereof, and the preparation method comprises the following steps:
(1) according to the stoichiometry of rare earth samarium silicate compounds2-1.5Sm2O3-0.25Na2O, accurately weighingDissolving nano silicon dioxide, samarium nitrate and sodium nitrate into an ethanol-water mixed solution, evaporating the solvent under the condition of stirring in a water bath at 80 ℃ to obtain gel, carrying out heat treatment at 150 ℃ for 4 hours to obtain rare earth samarium silicate pre-sintered powder, and carrying out heat treatment at 750 ℃ for 9 hours to obtain rare earth samarium silicate powder with the average particle size of 110 nm.
(2) Accurately weighing the required Mg (NO) according to the stoichiometric ratio of magnesium molybdate3)2And ammonium molybdate, dissolved in deionized water. Preparing a 10% citric acid solution, dropwise adding the solution into the solution while vigorously stirring, adjusting the pH to 3.0 by using ammonia water, evaporating the solvent under the stirring condition of 75 ℃ in a water bath to obtain gel, carrying out heat treatment at 120 ℃ for 6 hours to obtain magnesium molybdate pre-sintered powder, and carrying out heat treatment at 800 ℃ for 12 hours to obtain magnesium molybdate powder with the average particle size of 90 nm.
(3) 1.5g of TPX particles, as polymer TPX-trichloroethylene-1: 50, were weighed and dissolved in 75g (50mL) of trichloroethylene in a water bath at 55 ℃ to give a TPX resin solution.
(4) Respectively weighing 1g of silicon dioxide (50nm, sold on the market), 1.5g of rare earth samarium silicate obtained in the step (1) and 0.5g of calcium molybdate powder obtained in the step (2) according to the weight ratio of the functional powder composition of 1:1.5:0.5, adding the silicon dioxide powder, the rare earth samarium silicate obtained in the step (1) and the calcium molybdate powder obtained in the step (2) and 76.5g of TPX resin solution obtained in the step (3) into a high-speed grinding dispersion machine, and treating for 4 hours at the ball-milling rotating speed of 350 r/min to obtain functional slurry required for preparing the infrared strong selective radiation coating.
(5) And (4) coating the functional slurry prepared in the step (4) on an aluminized PET film (with the reflectivity of 95 percent and sold in the market) by using a coating machine according to the thickness dimension of 25 mu m to prepare a film, and naturally drying to obtain the required day and night dual-effect energy radiation cooler. The maximum temperature of the radiator can reach 9 ℃ day and night.
Example 3
The embodiment discloses a day and night dual-efficiency radiation cooler and a preparation method thereof, and the preparation method comprises the following steps:
(1) according to the stoichiometric ratio SiO of rare earth lanthanum silicate2-La2O3-0.8Na2O, accurately weighing a certain amount of nano silicon dioxide, lanthanum nitrate and sodium nitrate, dissolving into a volume of ethanol-water mixed solution, and placing in a water bath 70Evaporating the solvent under stirring to obtain gel, heat treating at 130 deg.C for 6 hr to obtain pre-sintered rare earth lanthanum silicate powder, and heat treating at 650 deg.C for 12 hr to obtain rare earth lanthanum silicate powder with average particle size of 104 nm.
(2) Accurately weighing Ba (NO) as raw material according to the stoichiometric ratio of barium molybdate3)2And ammonium molybdate, dissolved in deionized water. Preparing a 10% citric acid solution, dropwise adding the solution into the solution while vigorously stirring, adjusting the pH to 3.0 by using ammonia water, evaporating the solvent under the stirring condition of 70 ℃ in a water bath to obtain gel, carrying out heat treatment at 120 ℃ for 4 hours to obtain barium molybdate pre-sintered powder, and carrying out heat treatment at 900 ℃ for 9 hours to obtain barium molybdate powder with the average particle size of 94 nm.
(3) 2.0g of TPX particles, based on the polymer TPX trichloroethylene 1:45, were weighed out and dissolved in 90g (60mL) of trichloroethylene in a water bath at 50 ℃ to give a TPX resin solution.
(4) And (3) respectively weighing 1g of nano silicon dioxide (50nm, sold on the market), 0.5g of rare earth lanthanum silicate in the step (1) and 1.5g of barium molybdate powder in the step (2) according to the weight ratio of the functional powder composition of 1:0.5:1.5, adding the powder and 92g of TPX resin solution prepared in the step (3) into a high-speed grinding disperser, and processing for 4 hours at the ball-milling rotating speed of 400 r/min to obtain the functional slurry required by preparing the infrared strong selective radiation coating.
(5) And (4) coating the functional slurry prepared in the step (4) on an aluminum film (with the reflectivity of 97 percent, sold in the market) by using a coating machine according to the thickness dimension of 20 microns for film preparation, and naturally drying to obtain the required day and night dual-effect energy radiation cooler. The maximum temperature of the radiator can reach 10 ℃ day and night.
Example 4
The embodiment discloses a day and night dual-efficiency radiation cooler and a preparation method thereof, and the preparation method comprises the following steps:
(1) according to the stoichiometric ratio SiO of rare earth dysprosium silicate2-Dy2O3-0.5Na2O, accurately weighing a certain amount of nano silicon dioxide, dysprosium nitrate and sodium nitrate, dissolving into the ethanol-water mixed solution, evaporating the solvent under the condition of stirring in a water bath at 70 ℃ to obtain gel, and performing heat treatment at 150 ℃ for 3 hours to obtain rare earth dysprosium silicate pre-sinteringAnd carrying out heat treatment on the powder at 900 ℃ for 3 hours to obtain rare earth dysprosium silicate powder with the average particle size of 120 nm.
(2) Accurately weighing a certain amount of Ca (NO) according to the stoichiometric ratio of calcium molybdate3)2And ammonium molybdate, dissolved in deionized water. Preparing 10% citric acid solution, dropwise adding into the solution while vigorously stirring, adjusting pH to 3.0 with ammonia water, evaporating the solvent under stirring in a water bath at 70 ℃ to obtain gel, performing heat treatment at 150 ℃ for 6 hours to obtain calcium molybdate pre-sintered powder, and performing heat treatment at 950 ℃ for 6 hours to obtain calcium molybdate powder with the average particle size of 105 nm.
(3) 0.5g of PE particles are weighed according to the mass ratio of 1:55 between the PE polymer and the trichloroethylene, and the PE particles are dissolved into 27.5g (18.3mL) of trichloroethylene in a water bath at the temperature of 55 ℃ to obtain a PE resin solution.
(4) Respectively weighing 1g of nano silicon dioxide (50nm, sold on the market), 1g of rare earth dysprosium silicate powder in the step (1) and 0.5g of calcium molybdate powder in the step (2) according to the weight ratio of the functional powder composition of 1:1:0.5, adding the powder and 28g of PE resin solution prepared in the step (3) into a high-speed grinding dispersion machine, and treating for 6 hours at the ball-milling rotating speed of 300 r/min to obtain functional slurry required by preparing the infrared strong selective radiation coating.
(5) And (4) coating the functional slurry prepared in the step (4) on an aluminized PET film (with the reflectivity of 95 percent and sold in the market) by using a coating machine according to the thickness of 25 mu m to prepare a film, and naturally drying to obtain the required day and night dual-effect energy radiation cooler. The maximum temperature of the radiator can reach 8 ℃ day and night.
Example 5
The embodiment discloses a day and night dual-efficiency radiation cooler and a preparation method thereof, and the preparation method comprises the following steps:
(1) according to the stoichiometric ratio SiO of rare earth dysprosium silicate2-0.25Dy2O3-0.25La2O3-0.5Na2O, accurately weighing a certain amount of nano silicon dioxide, dysprosium nitrate, lanthanum nitrate and sodium nitrate, dissolving into the ethanol-water mixed solution, evaporating the solvent under the condition of stirring in a water bath at 80 ℃ to obtain gel, carrying out heat treatment at 120 ℃ for 6 hours to obtain rare earth dysprosium silicate/lanthanum pre-firing powder, and carrying out heat treatment at 800 ℃ for 6 hours to obtain rare earth dysprosium silicate/lanthanum pre-firing powderTo obtain rare earth dysprosium silicate/lanthanum powder with the average particle size of 90 nm.
(2) According to the stoichiometric ratio of magnesium molybdate, a certain amount of magnesium nitrate and ammonium molybdate are accurately weighed and dissolved in deionized water. Preparing a 10% citric acid solution, dropwise adding the solution into the solution while vigorously stirring, adjusting the pH to 4.0 by using ammonia water, evaporating the solvent under the stirring condition of 80 ℃ in a water bath to obtain gel, carrying out heat treatment at 150 ℃ for 4 hours to obtain magnesium molybdate pre-sintered powder, and carrying out heat treatment at 850 ℃ for 12 hours to obtain magnesium molybdate powder with the average particle size of 85 nm.
(3) 4.5g of TPX particles, as polymer TPX-trichloroethylene-1: 40, were weighed and dissolved in 180g (120mL) of trichloroethylene in a water bath at 55 ℃ to give a TPX resin solution.
(4) Respectively weighing 0.8g of nano silicon dioxide (sold in the market), 0.6g of rare earth dysprosium silicate/lanthanum silicate powder in the step (1) and 0.8g of magnesium molybdate powder in the step (2) according to the weight ratio of the functional powder composition of 1:0.75:1.0, adding the nano silicon dioxide powder, the rare earth dysprosium silicate/lanthanum silicate powder and the magnesium molybdate powder into a high-speed grinding disperser together with 184.5g of TPX resin solution prepared in the step (3), and processing for 4 hours at the ball-milling rotating speed of 350 r/min to obtain functional slurry required by preparing the infrared strong selective radiation coating.
(5) And (4) coating the functional slurry prepared in the step (4) on an aluminum-plated PET film aluminum film (with the reflectivity of 97 percent and sold in the market) by using a coating machine according to the thickness dimension of 15 mu m to prepare a film, and naturally drying to obtain the required day and night dual-effect energy radiation cooler. The maximum temperature of the radiator can reach 11 ℃ day and night.
Claims (5)
1. A day and night dual-effect energy radiation cooler is characterized by consisting of a broad-spectrum strong reflection type metal substrate and an 8-14 mu m infrared strong selective radiation coating coated on the surface of the substrate; wherein the broad spectrum strong reflection type metallic substrate is a metal aluminum film or an aluminum plating polymer film with visible-infrared reflection more than 95 percent; the 8-14 mu m infrared strong selective radiation coating consists of a visible-infrared transparent polymer and an 8-14 mu m infrared strong selective radiation active nano functional composition, wherein the mass content of the visible-infrared transparent polymer in the 8-14 mu m infrared strong selective radiation coating is 10-80%, and the mass content of the 8-14 mu m infrared strong selective radiation active nano functional compositionThe sexual nanometer functional composition is composed of nanometer silicon dioxide, a rare earth silicate compound and a molybdate compound according to the mass ratio of 1 (0.5-2) to 0.5-2; the stoichiometric ratio of the rare earth silicate compound is SiO2-(0.5～2.0)RE2O3-(0.1～1.0)Na2O and RE are any one or a combination of more of La, Sm, Eu, Gd, Tb, Dy, Er, Tm, Yb, Y or Sc; the molecular formula of the molybdate compound is RMoO4R is any one of alkaline earth metal elements Mg, Ca, Sr or Ba; the visible-infrared transparent polymer is any one of polyethylene or poly 4-methylpentene-1 resin; the thickness of the 8-14 mu m high infrared selective radiation coating is 5-30 mu m.
2. The dual-purpose energy radiation cooler for day and night as claimed in claim 1, wherein the nano rare earth silicate oxide is prepared by the following method: accurately weighing nano silicon dioxide, rare earth nitrate and sodium nitrate according to the stoichiometric ratio of the rare earth silicate compound, and mixing and dispersing the nano silicon dioxide, the rare earth nitrate and the sodium nitrate into an ethanol-water mixed solution; evaporating the solvent under the condition of stirring in a water bath at the temperature of 70-80 ℃ to obtain gel; and after low-temperature pre-sintering treatment at 120-150 ℃ for 3-6 hours, performing heat treatment at 600-900 ℃ for 3-12 hours to obtain the rare earth silicate compound.
3. The dual-purpose energy radiation cooler for day and night according to claim 1, wherein the nano molybdate compound is prepared by the following method: according to the stoichiometric ratio of the molybdate compound, accurately weighing ammonium molybdate and alkaline earth metal nitrate, and dissolving the ammonium molybdate and the alkaline earth metal nitrate into deionized water; preparing a citric acid solution with the mass concentration of 5-10%, stirring and dripping the citric acid solution into the solution, adjusting the pH to 3.0-4.0, and evaporating the solvent under the condition of stirring in a water bath at the temperature of 70-80 ℃ to obtain gel; and pre-sintering at the low temperature of 120-150 ℃ for 3-6 hours, and then performing heat treatment at the temperature of 800-1000 ℃ for 3-12 hours to obtain the molybdate compound.
4. A method of making the dual-effect day and night radiant cooler of claim 1, comprising the steps of:
(a) weighing a certain amount of poly 4-methylpentene-1 resin or polyethylene resin and a trichloroethylene organic solvent according to the mass ratio of the visible-infrared transparent polymer to the organic solvent being 1 (40-55), and heating and dissolving in a water bath to obtain a polymer resin solution;
(b) weighing a certain amount of nano silicon dioxide, rare earth silicate compound and molybdate compound according to the mass proportion of the nano functional powder composition;
(c) adding the functional powder composition prepared in the step (b) into the polymer resin solution prepared in the step (a) according to the mass content of the visible-infrared transparent polymer in the infrared strong selective radiation coating, and treating for 2-6 hours under the condition of 300-400 r/min by using a high-speed grinding dispersion machine to obtain functional slurry required by preparing the infrared strong selective radiation coating;
(d) and (c) coating the functional slurry obtained in the step (c) on the surface of a clean metal aluminum film or an aluminum-plated polymer film, drying and curing to obtain the required day and night dual-effect radiation cooler.
5. The method according to claim 4, wherein the temperature of the water bath in step (a) is 50-60 ℃.
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| CN201910694427.9A CN110305539B (en) | 2019-07-30 | 2019-07-30 | Day and night dual-efficiency radiation cooler and preparation method thereof |
| DE112020003667.7T DE112020003667B4 (en) | 2019-07-30 | 2020-04-14 | Radiant cooler that works efficiently both day and night and its manufacturing process |
| PCT/CN2020/084666 WO2021017525A1 (en) | 2019-07-30 | 2020-04-14 | Day and night dual-effect radiation cooler and preparation method therefor |
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| CN110330818B (en) * | 2019-07-30 | 2021-04-20 | 南京工业大学 | Infrared selective radiation cooling nano functional composition and preparation method thereof |
| CN113025133B (en) * | 2021-02-07 | 2022-06-21 | 浙江理工大学 | Super-hydrophobic daytime passive radiation refrigeration porous membrane and preparation method thereof |
| CN113074424A (en) * | 2021-04-28 | 2021-07-06 | 武汉大学 | Radiation air conditioning system based on polymer aerogel |
| CN113563769A (en) * | 2021-09-27 | 2021-10-29 | 江苏博云塑业股份有限公司 | Infrared radiation refrigeration optical coating and optical film |
| CN114656821A (en) * | 2022-04-19 | 2022-06-24 | 楚能新能源股份有限公司 | Passive radiation heat dissipation coating and preparation method and application thereof |
| CN115141520A (en) * | 2022-06-23 | 2022-10-04 | 南京工业大学 | Temperature response thermochromic radiation cooler and preparation method thereof |
| CN115537056A (en) * | 2022-08-18 | 2022-12-30 | 江苏博云塑业股份有限公司 | Rare earth silicate, radiation refrigeration composition, radiation refrigeration coating and preparation method |
| CN115819084A (en) * | 2022-10-27 | 2023-03-21 | 南京工业大学 | Selective absorption-radiator material and preparation method thereof |
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| WO2015159387A1 (en) * | 2014-04-16 | 2015-10-22 | 住友精化株式会社 | Heat dissipation film, dispersion liquid for heat emission layer, method for producing heat dissipation film and solar cell |
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