CN115073946A - Bionic porous rod-like particle heat dissipation coating and preparation method thereof - Google Patents
Bionic porous rod-like particle heat dissipation coating and preparation method thereof Download PDFInfo
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- CN115073946A CN115073946A CN202210680336.1A CN202210680336A CN115073946A CN 115073946 A CN115073946 A CN 115073946A CN 202210680336 A CN202210680336 A CN 202210680336A CN 115073946 A CN115073946 A CN 115073946A
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- 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
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
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- 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
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- 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
Abstract
The invention discloses a bionic porous rod-shaped particle heat dissipation coating and a preparation method thereof, the method comprises the steps of firstly weighing mesoporous silicon and nano zinc oxide in a certain mass ratio, uniformly mixing, placing in a high-temperature furnace, and when the temperature rises, diffusing the two materials through an interface to obtain a template limited bionic porous rod-shaped filler particle; secondly, diluting and mixing potassium silicate water glass and deionized water to obtain a binder; and finally, mixing the porous rod-shaped particles with a binder according to a certain proportion, performing ultrasonic dispersion and magnetic stirring to obtain coating slurry, coating the coating slurry on a metal or nonmetal substrate in a spraying or blade coating manner, and curing to obtain the ultra-white coating. The method is simple and low in cost, the reflectivity of the prepared coating in a solar wave band can reach 97%, the emissivity in an atmospheric window wave band can reach 96%, and the thermal conductivity is more than 1W/mK. The prepared bionic porous rod-shaped particle heat dissipation coating has good environmental weather resistance and is suitable for large-area coating and wide application.
Description
Technical Field
The invention belongs to the technical field of building energy conservation, and particularly relates to a bionic porous rod-shaped particle heat-dissipation coating and a preparation method thereof.
Background
At present, the main equipment for building the internal thermal comfortable environment is still a vapor compression type refrigerating unit, but the power consumption is larger, and the refrigerant can aggravate the greenhouse effect, and is not beneficial to energy conservation and environmental protection. With the proposal of the near-zero energy consumption building concept, the search of a low-energy consumption and even zero-energy consumption refrigeration mode to bear the cold load inside the building is an effective measure for reducing the building energy consumption. The passive radiation cooling technology takes the outer space with the temperature close to absolute zero as a cold source, continuously transmits the heat inside the object to the outer space in a radiation heat transfer mode, reduces the absorption of solar radiation heat, can effectively reduce the temperature of the object and achieves the refrigeration effect. The passive radiation cooling technology does not need external energy input, so that the passive radiation cooling technology has the advantages of zero energy consumption, environmental protection and high efficiency, and becomes one of the current research hotspots. The passive radiation cooling technology is combined with other refrigeration modes or is independently applied to the cooling in the building, so that the energy consumption can be effectively reduced.
The passive and passive radiation cooling technology is adopted to realize cooling in the building, so that not only the optical characteristics of the radiation refrigerating material but also the adhesiveness of the material on the surface of the building need to be considered. The building facade is mostly decorated by commercial coating, the commercial coating has the characteristics of simple preparation, low cost and strong adhesiveness, can be attached to the building facade for a long time without falling off, but the common commercial coating does not have the function of realizing radiation cooling. At present, although the radiation refrigeration coating can realize day subambient radiation cooling, the preparation process is complex, the cost is high, and the radiation refrigeration coating is difficult to be used in a large range; at the same time, further improvement of the optical performance is necessary. Therefore, by combining the advantages of commercial coating and radiation refrigeration coating, the invention provides the radiation refrigeration coating which has excellent optical performance, good adhesiveness, simple process, large-scale preparation and low cost, and the radiation refrigeration coating is coated on the outer vertical surface of the building to form the radiation refrigeration coating, thereby having important significance for building energy conservation and consumption reduction.
Disclosure of Invention
The invention aims to provide a preparation method of a bionic porous rod-like particle heat dissipation coating, which solves the defects of narrow photo-thermal regulation wave band, poor heat dissipation effect, complex process and poor weather resistance of the existing radiation heat dissipation coating.
In order to realize the aim of the invention, the invention discloses a preparation method of a bionic porous rod-shaped particle heat dissipation coating, which comprises the following steps:
step 3, sandblasting and cleaning the surface of the substrate to obtain a pollution-free rough substrate;
and 4, spraying, blade coating or brush coating the coating slurry prepared in the step 2 on the surface of the substrate, and curing to obtain the ultra-white coating.
Furthermore, the medium temperature is 600-900 ℃, the high temperature is 900-1200 ℃, and the diffusion phase is a disordered nano-pore texture structure containing silicon and zinc components.
Further, the interface reaction time is 1-2 hours, the curing time is 2-4 hours, the temperature rising speed is 3-5 ℃/min, and the reduction speed is 5 ℃/min.
Further, the specific gravity of each of the mesoporous silicon and the nano zinc oxide in the raw material mixture is not less than 10%, preferably 50%.
Further, the hydroxyl modifier used in the step 2 is 3-aminopropyltrimethoxysilane or a silane coupling agent; the binder is potassium silicate aqueous solution or acrylic resin or polymethylsiloxane;
further, in the coating slurry obtained in the step 2, the volume share of the binder is 35-60%.
Further, leveling is carried out for 12 hours before the surface of the substrate is cured, the curing mode is stepped heating curing, and the curing temperature is 30-100 ℃.
In order to realize the aim of the invention, the invention also discloses a bionic porous rod-shaped particle heat dissipation coating, which comprises the bionic porous rod-shaped particles and an adhesive, wherein the bionic porous rod-shaped particles are rod-shaped structures containing silicon and zinc diffusion phase components and having micro-nano scale pores.
Furthermore, the bionic porous rod-shaped particle structure is similar to the microstructure of the white scale on the shell of the scarab beetle and is also a rod-shaped structure with micro-nano scale pores. On one hand, the infrared radiation adjusting capability of a wide waveband (5-20 mu m) is improved by means of a special white carapace surface layer rod-shaped structure naturally evolved by the scarab beetle, and on the other hand, the scattering efficiency of the sun is improved by means of a micro-nano porous structure.
Compared with the prior art, the invention has the remarkable improvements that: 1) the radiation heat dissipation coating prepared by the invention has excellent photo-thermal performance, the reflectivity of the solar full-wave band reaches 97%, the emissivity of the atmospheric window wave band reaches 96%, and the emissivity of the 5-20 mu m wave band reaches 94%, so that the radiation heat dissipation effect can be effectively improved; 2) the bionic porous rod-like particles break through the limitation of a single ordered mesoporous structure in mesoporous silicon, obtain rod-like particles with a multi-scale disordered micro-nano pore structure, contribute to forming effective scattering on solar photons of different wave bands, widen light scattering wave bands and improve the solar full-spectrum reflectivity; 3) the method starts from the physical essence of the Kenkard and Oswald principles, the temperature and time of interfacial reaction and curing are appointed, and the method has high flexibility and controllability; 4) the preparation method is simple, low in cost, easy for large-scale production and large-area use, and the coating formed by coating the paint is high in strength and good in environmental weather resistance; 5) the coating prepared by the invention has no limit on the substrate material, can form stable coatings on the surfaces of different materials, can be widely applied to the coating of the outer vertical surfaces of buildings and the surfaces of other heat dissipation equipment, and realizes the cooling effect.
To more clearly illustrate the functional characteristics and structural parameters of the present invention, the following description is given with reference to the accompanying drawings and the detailed description.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a preparation method of a bionic porous rod-like particle heat dissipation coating of the present invention;
FIG. 2 is a transmission electron micrograph of a porous rod-like particle of the present invention;
FIG. 3 is a graph of the reflectance spectrum of a coating according to the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The overall preparation process of the invention is shown in figure 1. Firstly, preparing micro-nano porous rod-shaped particles containing silicon and zinc diffusion phases: the raw material mixture of the mesoporous silicon and the nano zinc oxide is placed in a high-temperature furnace, and the two materials are promoted to react at an interface under the medium-temperature oxygen atmosphere to generate a diffusion phase. And curing the diffusion phase at high temperature to obtain the micro-nano porous rod-shaped particles. Secondly, preparing an inorganic binder: diluting and mixing potassium silicate water glass and deionized water to obtain the inorganic binder. The porous rod-like particles are subjected to surface hydroxyl modification, and then coating slurry is prepared: mixing the porous rod-shaped particles with an inorganic binder according to a certain proportion, and obtaining coating slurry after ultrasonic dispersion and magnetic stirring. And finally, preparing a radiation refrigeration coating: the coating slurry is applied to a metal or non-metal substrate by spraying or blade coating or the like, and is cured to obtain an ultra-white coating.
Example 1
A preparation method of a bionic porous rod-shaped particle heat dissipation coating comprises the following steps:
respectively weighing mesoporous silicon and nano zinc oxide raw materials according to the mass ratio of 1:1, and fully mixing. Placing the mixed powder in oxygen atmosphere at 700 deg.C to promote the two materials to react at interface, and generating diffusion phase after 2 h. Curing the diffusion phase at the high temperature of 1200 ℃ for 2h to obtain the micro-nano porous rod-shaped particles. The temperature rising and falling speed is 5 ℃/min.
mixing potassium silicate water glass with the modulus of 3.3 and deionized water according to the mass ratio of 1:1, and magnetically stirring for 0.5 hour to obtain the required inorganic binder.
Step 3, preparing the radiation refrigeration coating slurry of the porous rod-shaped particles:
modifying the prepared micro-nano porous rod-shaped particles containing silicon and zinc diffusion phases by 3-aminopropyltrimethoxysilane, mixing the modified micro-nano porous rod-shaped particles with an inorganic binder according to the volume fraction ratio of 1:1, and performing ultrasonic dispersion and magnetic stirring to obtain coating slurry.
Step 4, preparing the radiation refrigeration coating
And (3) spraying the coating slurry prepared in the step (3) on the surface of a substrate by spraying, blade coating, brush coating or the like, leveling for 12 hours, and then heating and curing in a stepped manner (the curing temperature is 30 ℃) to obtain the ultra-white refrigeration coating.
Example 2
A preparation method of a bionic porous rod-shaped particle heat dissipation coating comprises the following steps:
respectively weighing mesoporous silicon and nano zinc oxide raw materials according to the mass ratio of 1:1, and fully mixing. Placing the mixed powder in 900 deg.C oxygen atmosphere to promote the two materials to react at interface, and generating diffusion phase after 1.5 h. Curing the diffusion phase at the high temperature of 1200 ℃ for 4h to obtain the micro-nano porous rod-shaped particles. The temperature rising and falling speed is 5 ℃/min.
adding acrylic resin particles into an N, N-dimethylformamide solvent, and stirring at the constant temperature of 40 ℃ for 1 hour to completely dissolve the resin particles to obtain a binder matrix.
Step 3, preparing the radiation refrigeration coating slurry of the porous rod-shaped particles:
modifying the prepared micro-nano porous rod-shaped particles containing silicon and zinc diffusion phases by 3-aminopropyltrimethoxysilane, mixing the modified micro-nano porous rod-shaped particles with a binder according to the volume fraction ratio of 1:1.2, and performing ultrasonic dispersion and magnetic stirring to obtain coating slurry.
Step 4, preparing a radiation refrigeration coating:
and (3) spraying the coating slurry prepared in the step (3) on the surface of a substrate by spraying, blade coating, brush coating or the like, leveling for 12 hours, and then heating and curing in a stepped manner (the curing temperature is 40 ℃) to obtain the ultra-white refrigeration coating.
Fig. 2 is a transmission electron microscope image of the prepared bionic porous rod-shaped particle, and it can be seen from the image that the particle is of a porous structure inside, and the size of the pores is equivalent to the wavelength of the solar wave band, so that the light scattering efficiency can be enhanced, and the reflectivity of the coating in the solar wave band is remarkably improved. FIG. 3 shows the reflection spectrum of the prepared radiation refrigeration coating in the whole band, which achieves a high reflectivity of 97% in the solar band and a emissivity of 94% in the infrared band of 5-20 μm.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A preparation method of a bionic porous rod-shaped particle heat dissipation coating is characterized by comprising the following steps:
step 1, placing a raw material mixture of mesoporous silicon and nano zinc oxide in a high-temperature furnace, and promoting the two materials to react at an interface under a medium-temperature oxygen atmosphere to generate a diffusion phase; curing the diffusion phase at high temperature to obtain micro-nano porous rod-shaped particles;
step 2, modifying the surface hydroxyl of the porous rod-shaped particles, and uniformly mixing the porous rod-shaped particles with a binder to obtain coating slurry;
step 3, sandblasting and cleaning the surface of the substrate to obtain a pollution-free rough substrate;
and 4, spraying, blade coating or brush coating the coating slurry prepared in the step 2 on the surface of the substrate, and curing to obtain the ultra-white coating.
2. The method for preparing the bionic porous rod-like particle heat dissipation coating as recited in claim 1, wherein the medium temperature is 600-.
3. The preparation method of the bionic porous rod-like particle heat dissipation coating as claimed in claim 1, wherein the interfacial reaction time is 1-2 hours, the aging time is 2-4 hours, the temperature rise speed is 3-5 ℃/min, and the reduction speed is 5 ℃/min.
4. The method for preparing a bionic porous rod-like particle heat-dissipation coating as claimed in claim 1, wherein the specific gravity of the mesoporous silicon and the nano zinc oxide in the raw material mixture is not less than 10%.
5. The preparation method of the bionic porous rod-like particle heat dissipation coating of claim 1, wherein the hydroxyl modifier used in the step 2 is 3-aminopropyltrimethoxysilane or a silane coupling agent; the binder is potassium silicate water solution or acrylic resin or polymethylsiloxane.
6. The method for preparing a bionic porous rod-like particle heat-dissipation coating as claimed in claim 1, wherein the volume fraction of the binder in the coating slurry obtained in step 2 is 35-60%.
7. The preparation method of the bionic porous rod-like particle heat dissipation coating of claim 1, wherein leveling is performed for 12 hours before the surface of the substrate is cured, the curing mode is stepped temperature rise curing, and the curing temperature is 30-100 ℃.
8. A bionic porous rod-shaped particle heat dissipation coating, which is prepared based on the preparation method of any one of claims 1 to 7, is characterized in that the heat dissipation coating comprises bionic porous rod-shaped particles and a bonding agent, and the bionic porous rod-shaped particles are rod-shaped structures containing silicon and zinc diffusion phase components and having micro-nano scale pores.
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| CN113604083A (en) * | 2021-07-05 | 2021-11-05 | 南京航空航天大学 | Solar spectrum total reflection type antistatic thermal control coating and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113604083A (en) * | 2021-07-05 | 2021-11-05 | 南京航空航天大学 | Solar spectrum total reflection type antistatic thermal control coating and preparation method thereof |
Non-Patent Citations (1)
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| 黄杰: "Structural rod-like particles for highly efficient radiative cooling" * |
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