CN114716865A - Radiation heat dissipation phase change coating for all-weather heat management and manufacturing method thereof - Google Patents
Radiation heat dissipation phase change coating for all-weather heat management and manufacturing method thereof Download PDFInfo
- Publication number
- CN114716865A CN114716865A CN202210465833.XA CN202210465833A CN114716865A CN 114716865 A CN114716865 A CN 114716865A CN 202210465833 A CN202210465833 A CN 202210465833A CN 114716865 A CN114716865 A CN 114716865A
- Authority
- CN
- China
- Prior art keywords
- phase change
- radiation
- coating
- heat dissipation
- ethanol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- C—CHEMISTRY; METALLURGY
- 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
-
- C—CHEMISTRY; METALLURGY
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L91/00—Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08L91/06—Waxes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a radiation heat dissipation phase change coating for all-weather heat management and a manufacturing method thereof. The main components of the coating are silicon dioxide, paraffin and binder resin, wherein the paraffin is wrapped in nano silicon dioxide spheres to form phase change microcapsules, and the microcapsules and the high infrared radiation binder resin are mixed to form the coating with the dual functions of radiation heat dissipation and heat storage. The coating is coated on the surfaces of building materials and outdoor devices to obtain a phase-change composite coating, the solar spectrum weighted reflectivity is 93-97%, the atmospheric window emissivity is 91-93%, and the phase-change enthalpy value is 60-80J/g. According to the invention, the infrared radiation enhanced phase-change composite material is prepared in a large scale by a low-cost method, on the basis of keeping the original high solar reflectivity and high atmospheric window infrared emission rate, the parasitic heat is stored by adding phase-change latent heat, the temperature rise is buffered, and finally, the better heat management performance of outdoor buildings and electronic devices is obtained.
Description
Technical Field
The invention relates to a coating, in particular to a radiation heat dissipation phase change coating for all-weather heat management of buildings and outdoor electronic devices and a manufacturing method thereof.
Background
Modern thermal management technologies consume a large amount of energy and are accompanied by the emission of a large amount of greenhouse gases, and the establishment of passive thermal management technologies will strongly alleviate the current situation. The radiation heat dissipation technology has attracted much attention in recent years, and the temperature of outdoor objects such as buildings and the like is passively reduced by reflecting almost all sunlight and enhancing infrared emission (8-13 mu m) of an atmospheric window so as to achieve the purpose of reducing heat management energy consumption. However, infrared radiation materials inevitably absorb solar energy, ambient radiation and conducted heat, and are not ideal in practice. Through theoretical design, the energy of passive input can be stored in a latent heat mode by combining a phase change energy storage material, and the heat dissipation effect of building thermal control is enhanced.
The invention for combining radiation heat dissipation and phase change energy storage materials mainly aims to simply splice a radiation heat dissipation coating and a phase change energy storage material layer so that the radiation heat dissipation coating and the phase change energy storage material layer respectively play roles. For example, in chinese patent publication CN107975895A, the radiation cooling film and the heat transfer fins are combined, and the phase change material is encapsulated by using a fin module, but the device forms a system with a large volume, which is not beneficial to building heat management application. Chinese utility model patent CN214469444U VO changing solid phase2The material layer is combined with a crystal reflecting layer which can only utilize VO2The change of optical properties before and after phase change does not combine the advantages of phase change heat storage, and the preparation cost is high.
Disclosure of Invention
Aiming at the problem of high energy consumption of the existing heat management, the invention aims to provide a radiation heat dissipation phase change coating for all-weather heat management of buildings and outdoor electronic devices and a manufacturing method thereof, so that better heat management performance of the outdoor buildings and the outdoor electronic devices is obtained, and the dependence of the heat management on energy use is reduced.
The invention provides a radiation heat dissipation phase change coating capable of being used for all-weather heat management of buildings and outdoor electronic devices, which has the double functions of radiation heat dissipation and heat storage, and mainly comprises silicon dioxide, paraffin and binder resin, wherein the paraffin is wrapped in nano silicon dioxide spheres to form phase change microcapsules, and the microcapsules and the high infrared radiation binder resin are mixed to form the radiation heat dissipation phase change coating.
Preferably, the diameter of the microcapsule is distributed in the range of 0.5-1.5 μm. The paraffin wrapped in the microcapsule is low-temperature phase-change paraffin which is composed of long-chain alkane with 17-20 carbon atoms, and the phase-change melting temperature range is 20-40 ℃.
The solar spectrum weighted reflectivity of the radiation heat dissipation-heat storage dual-function phase change coating is 93-97%, the emissivity of an atmospheric window is 91-93%, and the phase change enthalpy value is 60-80J/g.
Preferably, the binder resin is a high infrared radiation (emissivity greater than 90%) binder resin, such as a polyurethane resin, a polyacrylic resin, a polyvinyl butyral resin, and the like.
The mass ratio of the microcapsules to the binder resin is preferably 1-2.5.
The phase change microcapsule in the radiation heat dissipation phase change coating can be prepared by the following method: selecting low-polymerization-degree paraffin wax with a carbon chain length of 17-20, enabling the paraffin wax to interact with a surfactant in a water-ethanol mixed solvent to form an oil-in-water microemulsion, forming a silicon dioxide shell layer on the surface of a microemulsion liquid drop through hydrolysis reaction of organic silicon, forming paraffin liquid drops with different sizes according to different water and ethanol ratios, and further synthesizing microcapsule particles with different sizes. The microcapsule particles with the average diameter of about 1 mu m have the same size with the wavelength of sunlight, meet the Mie scattering condition and have higher sunlight reflectivity; the wavelength of the Si-O vibration peak in the silicon dioxide is positioned at an atmospheric window, so that the microcapsule has higher infrared emissivity of the atmospheric window; the selected paraffin has a melting temperature interval of 20-40 ℃, the phase change enthalpy value is high, the general building heat management requirements are met, and the temperature can be buffered to drop rapidly when heat is released at night. The microcapsule is mixed with binder resin with high infrared radiation, and finally the radiation heat dissipation-heat storage dual-function phase change composite material with good heat dissipation effect is obtained.
Specifically, the manufacturing method of the radiation heat dissipation phase change coating for all-weather heat management comprises the following steps:
1) selecting one or more long-chain alkanes with 17-20 carbon atoms for heating and melting, then mixing with liquid organic silicon, adding a water-ethanol mixed solvent after uniformly stirring, adding a cationic surfactant, performing ultrasonic dispersion after uniformly mixing to obtain a stable microemulsion, adjusting the pH to 10-12, and heating and hydrolyzing to obtain a microcapsule suspension;
2) carrying out suction filtration on the microcapsule suspension to obtain microcapsule powder, washing the microcapsule powder, then carrying out vacuum drying, and slowly removing the residual solvent;
3) dispersing the dried microcapsule powder into ethanol, adding high infrared radiation alcohol-soluble binder resin, and heating to obtain the radiation heat dissipation phase change coating.
In the step 1), the long-chain alkane may be heptadecane, octadecane, nonadecane, eicosane, or the like, and the mass percentage of the long-chain alkane in the mixed system is preferably 5% to 10%.
In the step 1), the liquid organosilicon can be selected from tetramethyl silicate, tetraethyl silicate, methyltrimethoxysilane and the like; the mass percentage of the liquid organosilicon in the mixed system is preferably 7.5-15%.
In the above step 1), the cationic surfactant may be, for example, cetyltrimethylammonium bromide, octadecyldimethylbenzylammonium chloride, etc.; the mass percentage content of the cationic surfactant in the mixed system is preferably 0.8-1.5%.
In the step 1), the mass percentage of the water-ethanol mixed solvent in the mixed system is preferably 78-85%. The ratio of water to ethanol influences the size of the formed paraffin droplets, and the volume ratio of water to ethanol is preferably 1-1.5.
In the step 1), preferably, a weakly alkaline solution is adopted to adjust the pH value of the microemulsion, wherein the weakly alkaline solution is concentrated ammonia water, soda water, sodium bicarbonate water and the like, and the adjusted pH value is 10-12.
Further, in the microemulsion formed in the step 1), the mass ratio of the long-chain alkane, the liquid organosilicon, the water-ethanol mixed solvent and the cationic surfactant is as follows in sequence: 5 to 10 percent, 7.5 to 15 percent, 78 to 85 percent and 0.8 to 1.5 percent.
In the step 1), preferably, a mixing system of long-chain alkane, liquid organosilicon, a water-ethanol mixed solvent and a cationic surfactant is stirred and mixed in a refiner at a high speed, the rotating speed of the refiner is 10000-15000 rpm, and the running time is 3-5 min; then, carrying out ultrasonic dispersion treatment by using an ultrasonic processor, wherein the power of the ultrasonic processor is 500-700W, and the running time is 10-20 min, so as to obtain stable emulsion; and (3) adjusting the pH value of the microemulsion to 10-12, heating to a proper temperature (such as 40-60 ℃) to perform slow mechanical stirring, wherein the mechanical stirring speed is 350-500 rpm, the running time is 24-36 h, and in the process, organic silicon is hydrolyzed to form a silicon dioxide shell layer on the surface of the microemulsion liquid drop to obtain the microcapsule suspension.
In the step 2), preferably, the microcapsule powder obtained by filtering is sequentially added with ethanol, water, n-hexane and ethanol for washing treatment for four times, and then the microcapsule powder is placed in a vacuum environment and heated to 60-80 ℃ for constant temperature treatment for a period of time, and the residual solvent is slowly removed.
In the step 3), the microcapsule powder is stirred and dispersed in ethanol through magnetons at a low rotating speed, the rotating speed of a rotor is 200-400 rpm, the running time is 30-60 min, then high-infrared radiation alcohol-soluble binder resin is added, and the mixture is heated to 40-60 ℃ and stirred at a constant temperature for 20-30 min to form the coating. Wherein the high infrared radiation alcohol-soluble binder resin can be selected from alcohol-soluble polyacrylic resin, alcohol-soluble polyurethane resin, alcohol-soluble polyvinyl butyral resin, and the like.
In the step 3), preferably, the mixing mass ratio of the microcapsule powder, the ethanol and the high infrared radiation alcohol-soluble binder resin is 9-12%, 80-85% and 5-9% in sequence.
The diameter of the microcapsule obtained by the method is 0.5-1.5 mu m, and the phase-change melting temperature is 20-40 ℃. The obtained coating is coated on the surfaces of building materials and outdoor devices in a spraying mode, a painting mode and the like to be used as a radiation heat dissipation-heat storage dual-function phase change composite coating, the solar spectrum weighted reflectivity is 93-97%, the atmospheric window emissivity is 91-93%, and the phase change enthalpy value is 60-80J/g. Compared with the prior art, the radiation heat dissipation phase change coating for all-weather heat management of buildings and outdoor electronic devices and the preparation method thereof have the advantages that: the infrared radiation enhanced phase-change composite material is prepared in a large scale by a low-cost method, the parasitic heat is stored by adding phase-change latent heat on the basis of keeping the original high solar reflectivity and high atmospheric window infrared emission rate, the temperature rise is buffered, and finally the better heat management performance of outdoor buildings and electronic devices is obtained.
Drawings
Fig. 1 is a photo of a dual phase change composite coating with radiation heat dissipation and heat storage functions of example 5.
Fig. 2 is an SEM image of the microcapsule-resin coating material prepared in example 5.
Detailed Description
The present invention is described in detail below by way of examples, which are only intended to illustrate the invention and are not intended to limit the scope of the invention. Other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1
Heptadecane, tetramethyl silicate, a water-ethanol solvent (volume ratio is 3:2), hexadecyl trimethyl ammonium bromide are mixed according to the mass ratio of 5% to 9% to 85% to 1%, stirring treatment is carried out by a homogenizer at the rotating speed of 10000rpm after mixing, ultrasonic dispersion treatment is carried out by an ultrasonic processor at the power of 500W, the operation time is 3min and 10min respectively, and finally the stable dispersed microemulsion is formed. And (3) placing the microemulsion into a three-neck flask, slowly stirring the microemulsion through a mechanical stirrer at 400rpm, heating the microemulsion to a constant temperature of 45 ℃ in a water bath, adding 2mL of concentrated ammonia water to adjust the pH value to 10-12, and reacting for 24 hours to obtain a microcapsule suspension. The microcapsule is obtained by filtering the suspension, ethanol, water, normal hexane and ethanol are sequentially added for washing treatment for four times, then the microcapsule is placed in a vacuum oven to be dried for 12 hours at the constant temperature of 60 ℃, and the residual solvent is slowly removed. Dispersing the dried microcapsule powder into ethanol through magnetons at the rotating speed of 500rpm, adding alcohol-soluble polyacrylic resin, heating to 50 ℃, stirring at constant temperature for 20-30 min to form a coating system, wherein the mass percentages of the microcapsule powder, the ethanol and the alcohol-soluble polyacrylic resin are 9%, 85% and 6%, respectively. The prepared coating system is coated on the surfaces of building materials and outdoor devices by spraying, painting and the like to be used as a radiation heat dissipation-heat storage dual-function phase change composite coating, the solar spectrum weighted reflectivity is 95.5%, the atmospheric window emissivity is 92%, and the phase change enthalpy value is 75J/g. .
Example 2
Mixing octadecane, tetraethyl silicate, a water-ethanol solvent (volume ratio is 3:2) and octadecyl dimethyl benzyl ammonium chloride according to the mass ratio of 6% to 9% to 84% to 1%, stirring the mixture by a homogenizer at the rotating speed of 12000rpm, performing ultrasonic dispersion treatment by an ultrasonic processor at the power of 600W for 4min and 12min respectively, and finally forming the stably dispersed microemulsion. And (3) placing the microemulsion into a three-neck flask, slowly stirring the microemulsion by a mechanical stirrer at 400rpm, heating the microemulsion in a water bath to a constant temperature of 45 ℃, adding 2mL of concentrated ammonia water to adjust the pH value to 10-12, and reacting for 30 hours to obtain a microcapsule suspension. The microcapsule is obtained by filtering the suspension, ethanol, water, n-hexane and ethanol are sequentially added for washing treatment for four times, then the microcapsule is placed in a vacuum oven to be dried for 12 hours at the constant temperature of 60 ℃, and the residual solvent is slowly removed. Dispersing the dried microcapsule powder into ethanol through magnetons at the rotating speed of 500rpm, adding alcohol-soluble polyurethane resin, heating to 50 ℃, stirring at constant temperature for 20-30 min to form a coating system, wherein the mass percentages of the materials of the microcapsule powder, the ethanol and the alcohol-soluble polyurethane resin are 12%, 79% and 9%, respectively. The prepared coating system is coated on the surfaces of building materials and outdoor devices by spraying, painting and the like to be used as a radiation heat dissipation-heat storage dual-function phase change composite coating, the solar spectrum weighted reflectivity is 95.5%, the atmospheric window emissivity is 93%, and the phase change enthalpy value is 65J/g.
Example 3
Mixing nonadecane, methyltrimethoxysilane, a water-ethanol solvent (volume ratio is 3:2) and hexadecyl trimethyl ammonium bromide according to the mass ratio of 8% to 12% to 78.8% to 1.2%, stirring by a homogenizer at the rotating speed of 12000rpm, performing ultrasonic dispersion treatment by an ultrasonic processor at the power of 600W, and finally forming the stably dispersed microemulsion, wherein the operation time is 5min and 15min respectively. And (3) placing the microemulsion into a three-neck flask, slowly stirring the microemulsion by a mechanical stirrer at 400rpm, heating the microemulsion to a constant temperature of 45 ℃ in a water bath, adding a proper amount of soda water solution to adjust the pH value to 10-12, and reacting for 36 hours to obtain the microcapsule suspension. The microcapsule is obtained by filtering the suspension, ethanol, water, n-hexane and ethanol are sequentially added for washing treatment for four times, then the microcapsule is placed in a vacuum oven to be dried for 12 hours at the constant temperature of 60 ℃, and the residual solvent is slowly removed. Dispersing the dried microcapsule powder in ethanol through magnetons at the rotating speed of 500rpm, adding alcohol-soluble polyurethane resin, heating to 50 ℃, stirring at constant temperature for 20-30 min to form a coating system, wherein the mass percentages of the materials of the microcapsule powder, the ethanol and the alcohol-soluble polyurethane resin are 10%, 80% and 10%, respectively. The prepared coating system is coated on the surfaces of building materials and outdoor devices by spraying, painting and the like to be used as a radiation heat dissipation-heat storage dual-function phase change composite coating, the solar spectrum weighted reflectivity is 95.5%, the atmospheric window emissivity is 93%, and the phase change enthalpy value is 60J/g.
Example 4
The preparation method comprises the steps of mixing eicosane, tetramethyl silicate, a water-ethanol solvent (volume ratio is 3:2) and octadecyl dimethyl benzyl ammonium chloride according to the mass ratio of 6: 9: 84.2: 0.8%, stirring the mixture by a homogenizer at the rotation speed of 10000rpm, performing ultrasonic dispersion treatment by an ultrasonic processor at the power of 500W for 4min and 10min respectively, and finally forming the stably dispersed microemulsion. And (3) placing the microemulsion into a three-neck flask, slowly stirring the microemulsion through a mechanical stirrer at 400rpm, heating the microemulsion to a constant temperature of 45 ℃ in a water bath, adding 2mL of concentrated ammonia water to adjust the pH value to 10-12, and reacting for 30 hours to obtain a microcapsule suspension. The microcapsule is obtained by filtering the suspension, ethanol, water, n-hexane and ethanol are sequentially added for washing treatment for four times, then the microcapsule is placed in a vacuum oven to be dried for 12 hours at the constant temperature of 60 ℃, and the residual solvent is slowly removed. Dispersing the dried microcapsule powder into ethanol through magnetons at the rotating speed of 500rpm, adding high infrared radiation alcohol-soluble polyacrylic resin, heating to 50 ℃, stirring at constant temperature for 20-30 min to form a coating system, wherein the mass percentages of the materials of the microcapsule powder, the ethanol and the alcohol-soluble polyacrylic resin are 12%, 80% and 8% respectively. The prepared coating system is coated on the surfaces of building materials and outdoor devices by spraying, painting and the like to be used as a radiation heat dissipation-heat storage dual-function phase change composite coating, the solar spectrum weighted reflectivity is 94%, the atmospheric window emissivity is 93%, and the phase change enthalpy value is 70J/g.
Example 5
Mixing octadecane, tetraethyl silicate, a water/ethanol solvent (volume ratio of 3:2) and hexadecyl trimethyl ammonium bromide according to the mass ratio of 9: 12: 78: 1%, stirring by a homogenizer at the rotating speed of 12000rpm, and performing ultrasonic dispersion treatment by an ultrasonic processor at the power of 500W for 4min and 15min respectively to finally form the stably dispersed microemulsion. And (3) placing the microemulsion into a three-neck flask, slowly stirring the microemulsion through a mechanical stirrer at 400rpm, heating the microemulsion in a water bath to a constant temperature of 45 ℃, adding a proper amount of sodium bicarbonate aqueous solution to adjust the pH value to 10-12, and reacting for 24 hours to obtain the microcapsule suspension. The microcapsule is obtained by filtering the suspension, ethanol, water, n-hexane and ethanol are sequentially added for washing treatment for four times, then the microcapsule is placed in a vacuum oven to be dried for 12 hours at the constant temperature of 60 ℃, and the residual solvent is slowly removed. Dispersing the dried microcapsule powder into ethanol through magnetons at the rotating speed of 500rpm, adding high infrared radiation alcohol-soluble polyurethane resin, heating to 50 ℃, stirring at constant temperature for 20-30 min to form a coating system, wherein the mass percentages of the materials of the microcapsule powder, the ethanol and the alcohol-soluble polyurethane resin are respectively 10%, 80% and 10%. The prepared coating system is coated on the surfaces of building materials and outdoor devices by means of spraying, painting and the like, the obtained coating is shown as figure 1, and figure 2 is an SEM structural diagram of the coating, wherein microcapsules and a binder are well dispersed and combined, and the microcapsules keep a spherical structure. As a phase change composite coating with double functions of radiation heat dissipation and heat storage, the solar spectrum weighted reflectivity is 93.5%, the atmospheric window emissivity is 92%, and the phase change enthalpy value is 63J/g.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A radiation heat dissipation phase change coating has the double functions of radiation heat dissipation and heat storage, and mainly comprises silicon dioxide, paraffin and binder resin, wherein the paraffin is wrapped in nano silicon dioxide spheres to form phase change microcapsules, and the microcapsules and the high infrared radiation binder resin are mixed to form the radiation heat dissipation phase change coating.
2. The radiation-curable phase change coating according to claim 1, wherein the microcapsules have a diameter of 0.5 to 1.5 μm.
3. The radiant heat-dissipating phase-change coating as claimed in claim 1, wherein the paraffin encapsulated in the microcapsule is low-temperature phase-change paraffin composed of long-chain alkane with 17-20 carbon atoms, and the phase-change melting temperature range is 20-40 ℃.
4. The radiation-curable phase change coating according to claim 4, wherein the high IR binder resin has an emissivity greater than 90% and is selected from the group consisting of polyurethane resins, polyacrylic resins, and polyvinyl butyral resins.
5. The radiation-curable phase change coating material according to claim 1, wherein the mass ratio of the microcapsules to the binder resin is 1 to 2.5.
6. The radiant heat-dissipating phase change coating as claimed in claim 1, wherein the solar spectrum weighted reflectivity of the radiant heat-dissipating phase change coating is 93-97%, the atmospheric window emissivity is 91-93%, and the enthalpy of phase change is 60-80J/g.
7. The preparation method of the radiation heat dissipation phase change coating material as claimed in any one of claims 1 to 6, comprising the following steps:
1) selecting one or more long-chain alkanes with 17-20 carbon atoms for heating and melting, then mixing with liquid organic silicon, uniformly stirring, adding a water-ethanol mixed solvent, adding a cationic surfactant, uniformly mixing, performing ultrasonic dispersion to obtain a microemulsion, adjusting the pH to 10-12, and heating and hydrolyzing to obtain a microcapsule suspension;
2) carrying out suction filtration on the microcapsule suspension to obtain microcapsule powder, washing the microcapsule powder, then carrying out vacuum drying, and slowly removing the residual solvent;
3) dispersing the dried microcapsule powder into ethanol, adding high infrared radiation alcohol-soluble binder resin, and heating to obtain the radiation heat dissipation phase change coating.
8. The preparation method according to claim 7, wherein the liquid organosilicon in step 1) is selected from the group consisting of tetramethyl silicate, tetraethyl silicate and methyltrimethoxysilane, the cationic surfactant is selected from the group consisting of cetyl trimethyl ammonium bromide and octadecyl dimethyl benzyl ammonium chloride, and the volume ratio of water to ethanol in the water-ethanol mixed solvent is 1-1.5; the high infrared radiation alcohol-soluble binder resin in the step 3) is selected from alcohol-soluble polyacrylic resin, alcohol-soluble polyurethane resin and alcohol-soluble polyvinyl butyral resin.
9. The preparation method according to claim 7, wherein in the microemulsion formed in step 1), the mass ratio of the long-chain alkane, the liquid organosilicon, the water-ethanol mixed solvent and the cationic surfactant is as follows in sequence: 5% -10%, 7.5% -15%, 78% -85% and 0.8% -1.5%; in the step 3), the mixing mass ratio of the microcapsule powder, the ethanol and the high infrared radiation alcohol-soluble binder resin is 9-12%, 80-85% and 5-9% in sequence.
10. The preparation method of claim 7, wherein in the step 1), the mixing system of the long-chain alkane, the liquid organosilicon, the water-ethanol mixed solvent and the cationic surfactant is stirred and mixed at a high speed in a refiner, the rotation speed of the refiner is 10000-15000 rpm, and the running time is 3-5 min; then, carrying out ultrasonic dispersion treatment by using an ultrasonic processor, wherein the power of the ultrasonic processor is 500-700W, and the running time is 10-20 min, so as to obtain stable emulsion; adjusting the pH value of the microemulsion to 10-12, heating to 40-60 ℃, slowly and mechanically stirring at the rotating speed of 350-500 rpm for 24-36 h, and hydrolyzing organic silicon in the process to form a silicon dioxide shell layer on the surface of the microemulsion liquid drop to obtain a microcapsule suspension.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210465833.XA CN114716865B (en) | 2022-04-29 | 2022-04-29 | Radiation heat dissipation phase change coating for all-weather heat management and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210465833.XA CN114716865B (en) | 2022-04-29 | 2022-04-29 | Radiation heat dissipation phase change coating for all-weather heat management and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114716865A true CN114716865A (en) | 2022-07-08 |
| CN114716865B CN114716865B (en) | 2023-02-24 |
Family
ID=82245399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210465833.XA Active CN114716865B (en) | 2022-04-29 | 2022-04-29 | Radiation heat dissipation phase change coating for all-weather heat management and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114716865B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613434A (en) * | 2009-07-15 | 2009-12-30 | 华南理工大学 | A kind of alcohol soluble polyacrylate resin and preparation method thereof and application |
| CN101659829A (en) * | 2009-09-27 | 2010-03-03 | 西安华捷奥海新材料有限公司 | Infrared radiation composite radiating coating and preparation method and spraying method thereof |
| CN102408806A (en) * | 2011-11-03 | 2012-04-11 | 浙江大学 | High-emission transparent heat-insulating paint in atmospheric window regions and preparation method thereof |
| CN104046333A (en) * | 2014-06-16 | 2014-09-17 | 浙江大学 | Preparation method of mannitol-silica core-shell structured PCM (phase-change material) microcapsule |
| CN104449590A (en) * | 2014-12-05 | 2015-03-25 | 中国工程物理研究院化工材料研究所 | Phase-change energy-storage material nanocapsule and preparation method thereof |
| CN105368245A (en) * | 2015-12-26 | 2016-03-02 | 孝感巨核新材料科技有限公司 | Phase-change interior wall coating with energy storage and temperature adjustment functions and preparation method of coating |
| WO2017173176A1 (en) * | 2016-04-01 | 2017-10-05 | Entropy Solutions Llc | Microencapsulated composite phase change materials |
| CN108976880A (en) * | 2018-08-10 | 2018-12-11 | 佛山腾鲤新能源科技有限公司 | The preparation method of phase-change solar heat-absorbing paint in a kind of high thermal absorptivity |
| CN110317521A (en) * | 2019-07-05 | 2019-10-11 | 宁波瑞凌新能源科技有限公司 | Selective radiation refrigeration coating and its composite material and methods for using them |
| CN110330848A (en) * | 2019-07-13 | 2019-10-15 | 武汉中科先进技术研究院有限公司 | A kind of mould proof temperature control type building coating of aqueous, environmental protective and preparation method thereof |
| WO2019216510A1 (en) * | 2018-05-10 | 2019-11-14 | (주)비에이에너지 | Composite of phase change material-containing microcapsules and silica, preparation method therefor, and non-flammable binder composition comprising same |
-
2022
- 2022-04-29 CN CN202210465833.XA patent/CN114716865B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101613434A (en) * | 2009-07-15 | 2009-12-30 | 华南理工大学 | A kind of alcohol soluble polyacrylate resin and preparation method thereof and application |
| CN101659829A (en) * | 2009-09-27 | 2010-03-03 | 西安华捷奥海新材料有限公司 | Infrared radiation composite radiating coating and preparation method and spraying method thereof |
| CN102408806A (en) * | 2011-11-03 | 2012-04-11 | 浙江大学 | High-emission transparent heat-insulating paint in atmospheric window regions and preparation method thereof |
| CN104046333A (en) * | 2014-06-16 | 2014-09-17 | 浙江大学 | Preparation method of mannitol-silica core-shell structured PCM (phase-change material) microcapsule |
| CN104449590A (en) * | 2014-12-05 | 2015-03-25 | 中国工程物理研究院化工材料研究所 | Phase-change energy-storage material nanocapsule and preparation method thereof |
| CN105368245A (en) * | 2015-12-26 | 2016-03-02 | 孝感巨核新材料科技有限公司 | Phase-change interior wall coating with energy storage and temperature adjustment functions and preparation method of coating |
| WO2017173176A1 (en) * | 2016-04-01 | 2017-10-05 | Entropy Solutions Llc | Microencapsulated composite phase change materials |
| WO2019216510A1 (en) * | 2018-05-10 | 2019-11-14 | (주)비에이에너지 | Composite of phase change material-containing microcapsules and silica, preparation method therefor, and non-flammable binder composition comprising same |
| CN108976880A (en) * | 2018-08-10 | 2018-12-11 | 佛山腾鲤新能源科技有限公司 | The preparation method of phase-change solar heat-absorbing paint in a kind of high thermal absorptivity |
| CN110317521A (en) * | 2019-07-05 | 2019-10-11 | 宁波瑞凌新能源科技有限公司 | Selective radiation refrigeration coating and its composite material and methods for using them |
| CN110896639A (en) * | 2019-07-05 | 2020-03-20 | 宁波瑞凌新能源科技有限公司 | Radiation refrigeration functional coating and application thereof |
| CN110330848A (en) * | 2019-07-13 | 2019-10-15 | 武汉中科先进技术研究院有限公司 | A kind of mould proof temperature control type building coating of aqueous, environmental protective and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114716865B (en) | 2023-02-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109499499B (en) | Super-hydrophobic phase change energy storage material microcapsule and preparation method thereof | |
| CN105797659B (en) | A kind of preparation method of silica chitosan bivalve heat accumulation microcapsules | |
| CN109679585B (en) | Phase-change microcapsule synthesized by adopting photocuring method and preparation method thereof | |
| CN108251067B (en) | Phase-change fluid based on graphene oxide and titanium dioxide coated paraffin and preparation method thereof | |
| CN106882811A (en) | A kind of sea urchin shape bivalve layer hollow microsphere and preparation method thereof | |
| CN104559398A (en) | Manufacturing method of high-performance heat insulation material | |
| CN103073669A (en) | Method for preparing nano titanium dioxide/polyacrylate compound emulsion | |
| WO2022166345A1 (en) | Large-scale preparation method for three-dimensional porous nano composite cooling thin film | |
| CN114716865B (en) | Radiation heat dissipation phase change coating for all-weather heat management and manufacturing method thereof | |
| CN115418164B (en) | High-temperature heat reflecting material and construction process thereof | |
| CN113954453B (en) | Colored double-layer radiation refrigerating film and preparation method thereof | |
| CN109126643A (en) | One kind is from transparent composite aerogel of Light modulating type and preparation method thereof | |
| CN1546312A (en) | Aerogel recombination flexible thermal insulation heat-proof thin film and process for preparing same | |
| CN113462272A (en) | Heat-insulating radiation-proof coating and preparation method thereof | |
| Ghufran et al. | Synthesis of nano-size paraffin/silica-based encapsulated phase change materials of high encapsulation ratio via sol–gel method | |
| Xia et al. | Water-based kaolin/polyacrylate cooling paint for exterior walls | |
| CN108624169B (en) | Nano titanium dioxide composite material for anti-infrared heat-insulation water-based paint and preparation process thereof | |
| CN112546978A (en) | Multifunctional phase change microcapsule and preparation method thereof | |
| CN106431001A (en) | Method for preparing hydrophobic SiO2 antireflective coating with organic-inorganic hybrid method | |
| CN108129957A (en) | A kind of power device heat radiation coating and preparation method thereof | |
| JP2011225705A (en) | Thermal conversion composition, method for producing thermal conversion composition, and method for forming coating film of thermal conversion composition | |
| CN112876896B (en) | Rare earth metal organic complex coated zinc oxide titanium nano sol and preparation method thereof | |
| CN116814142B (en) | Water-based composite heat-preservation heat-insulation coating and preparation method thereof | |
| CN115368816B (en) | Preparation method of anti-icing paint for wind driven generator blade | |
| CN111154459B (en) | Organic-inorganic hybrid shell phase change capsule and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |