CN116640486B - Radiation refrigeration coating for building and preparation method thereof - Google Patents
Radiation refrigeration coating for building and preparation method thereof Download PDFInfo
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- CN116640486B CN116640486B CN202310764406.6A CN202310764406A CN116640486B CN 116640486 B CN116640486 B CN 116640486B CN 202310764406 A CN202310764406 A CN 202310764406A CN 116640486 B CN116640486 B CN 116640486B
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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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- C09D129/00—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 an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
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- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- 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
- C09D131/00—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 an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
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- C09D131/04—Homopolymers or copolymers of vinyl acetate
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- C09D143/00—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 containing boron, silicon, phosphorus, selenium, tellurium, or a metal; Coating compositions based on derivatives of such polymers
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/32—Radiation-absorbing paints
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2244—Oxides; Hydroxides of metals of zirconium
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Abstract
The invention relates to a radiation refrigeration coating for buildings and a preparation method thereof, and the coating is prepared from the following components in percentage by mass: 5-45 parts of tetrahedral radiation refrigeration filler, 3-25 parts of titanium dioxide, 2-5 parts of hollow glass microsphere, 15-30 parts of emulsion, 8-10 parts of functional auxiliary agent and 20-25 parts of water. The invention adopts tetrahedron radiation refrigeration filler to replace traditional spherical, porous and other particles, forms multidirectional reflection and radiation surfaces protruding from a base surface on the surface of the finish paint, can reflect sunlight and environment refraction light for multiple times, increases the radiation surface, leads the protrusion to face to open outer space, has no infrared radiation shielding, and strengthens radiation refrigeration efficiency.
Description
Technical Field
The invention relates to the field of radiation refrigeration, in particular to a radiation refrigeration coating for a building and a preparation method thereof.
Background
The radiation refrigeration technology is a novel refrigeration technology for reducing the temperature of an object to be below the ambient temperature through heat radiation, and mainly utilizes heat exchange between the earth and the outer space, wherein the heat radiation of the object on the earth can pass through an atmospheric window to directly emit heat to the outer space, so that the heat exchange with an outer space cold field is realized.
The radiation refrigerating paint is one kind of special paint for building surface. The main components of the radiation refrigeration paint are filler with high reflectivity at the visible light near infrared and filler with high emissivity at the wavelength of 8-14 mu m. It can reflect most of the energy of the visible light and near infrared of solar spectrum, thereby reducing the absorption energy of the building surface and the temperature of the building surface. Meanwhile, electromagnetic waves in the range of the atmospheric window can be radiated in the daytime and at night, so that the surface temperature of a building is further reduced, and energy conservation is realized. The coating based on the method is also called an electroless refrigeration coating, and can achieve the cooling effect in an electroless, environment-friendly and energy-saving mode without using other energy sources or refrigerants, thereby effectively saving the energy consumption of an air conditioner and realizing cooling and carbon energy saving.
In nature, there are also many phenomena of radiation refrigeration. For example, sahara silver ants are ants living in the sahara desert, which are capable of surviving extremely high temperature environments and have excellent radiation refrigerating ability. The body surface of the silver ant is covered with tiny hairs which reflect most of the energy in the solar spectrum, and the body of the silver ant is also provided with a special structure, and the top and the side of the body are covered with hairs with unique shapes of triangular cross sections. These structures can help the silver saharan ants to more efficiently reflect sunlight and refrigerate by radiation, enabling them to live by foraging in a high temperature environment.
In some current researches, for example, CN 108250873A (outdoor all-weather sunlight reflecting and infrared radiation refrigerating paint) is added with a micron-sized metal plating flake and/or micron-sized metal plating spherical body in a paint system, and a layered coating mode is adopted, and the metal plating flake structure realizes high sunlight reflection and infrared high radiation in a coating direction, so that the passive refrigerating effect is achieved. The patent with publication number CN 115652616A (a photo-aging resistant protective type radiation refrigeration filler particle and coating, and a preparation method and application thereof) provides a filler which is prepared by mixing and modifying inorganic particles and lignin, and improves the radiation refrigeration effect of the whole material by utilizing the photo-aging resistant performance of lignin and the reflection performance of inorganic particles. However, these patents merely modify the metal emitters toward space or particles by painting, and do not direct the emitters toward open outer space by changing the shape of the filler.
Disclosure of Invention
The invention provides a radiation refrigeration coating for buildings and a preparation method thereof, wherein tetrahedron radiation refrigeration filler is adopted to replace traditional spherical, porous and other particles, a multidirectional reflection and radiation surface protruding from a base surface is formed on the surface of a finish paint, sunlight and environment refraction light can be reflected for multiple times, the radiation surface is increased, the protrusion faces to an open outer space, no infrared radiation shielding exists, and radiation refrigeration efficiency is enhanced.
Scheme one
The invention is realized by the following technical scheme:
The radiation refrigeration coating for the building is prepared from the following components in percentage by mass: 5-45 parts of tetrahedral radiation refrigeration filler, 3-25 parts of titanium dioxide, 2-5 parts of hollow glass microsphere, 15-30 parts of emulsion, 8-10 parts of functional auxiliary agent and 20-25 parts of water.
Preferably, the tetrahedral radiation refrigeration filler is tetrahedral particles with the diameter of 1-100 μm of circumscribed circles made of aluminum oxide and zirconium oxide. Specifically, a 3M Trizact TM abrasive may be used.
Preferably, the titanium dioxide is nano titanium dioxide with the grain size less than or equal to 300 nm.
Preferably, the emulsion is one of acrylic emulsion, polyvinyl acetate emulsion, silicone-acrylate emulsion, polyurethane emulsion or polyvinyl alcohol.
Preferably, the functional auxiliary agent is one or any combination of more than two of film forming auxiliary agent, wetting agent, cellulose, PH regulator, defoamer, antifreezing agent or bactericide.
Scheme II
A preparation method of a radiation refrigeration coating for a building comprises the following steps:
Firstly, stirring water, emulsion, functional auxiliary agent and titanium pigment into mixed liquor by adopting vertical stirring with a dispersion disk, then uniformly stirring the mixed liquor and hollow glass beads on a dragon stirrer, and finally adding tetrahedron radiation refrigeration filler and uniformly stirring to obtain the radiation refrigeration coating for the building.
After the prepared radiation refrigeration coating dry film, tetrahedral radiation refrigeration filler is freely deposited on a film forming base surface, wherein the height of 1/5-4/5 is the height of the film forming base surface exposed out, and the tetrahedral radiation refrigeration coating dry film has a special surface structure.
The tetrahedral radiation refrigeration packing of the present invention comprises four faces joined by six edges ending at four vertices. Each of the four faces contacts three of the four faces and a majority of the tetrahedral particles have at least one of the vertices oriented in substantially the same direction, the interior of the particles may be solid, hollow, porous, or a variety of forms.
The tetrahedron radiation refrigeration filling material is used in radiation refrigeration coating, at least one surface is easily connected with a film forming base surface, the other three surfaces are partially exposed on the base surface to form mountain-shaped bulges, and the parts are not covered by other materials and can directly exchange heat with an outer space cold field. The radiation refrigeration paint composed of tetrahedron radiation refrigeration filler has more exposed surface area than common radiation refrigeration paint, the radiation refrigeration body is exposed in multiple directions, no other shielding exists, and more area refrigeration body exchanges heat radiation with the direct outer space cold field, so that the refrigeration power is greatly increased. Compared with the conventional particle or porous particle used as the filler, the radiation refrigerating body is not hidden in the mixed film forming material, so that the relative radiation area of the radiator is increased, the radiation energy is increased, and the absorptivity of the coating to infrared radiation is improved.
Compared with the prior art, the invention has the following beneficial effects:
The invention adopts tetrahedron radiation refrigeration filler to replace traditional spherical, porous and other particles, forms multidirectional reflection and radiation surfaces protruding from a base surface on the surface of the finish paint, can reflect sunlight and environment refraction light for multiple times, increases the radiation surface, leads the protrusion to face to open outer space, has no infrared radiation shielding, and has high radiation refrigeration efficiency.
Drawings
Fig. 1 is a schematic diagram of a regular tetrahedral packing.
Fig. 2 is a schematic diagram of a tetrahedral packing with defects on points, lines, faces.
Fig. 3 is a schematic view of a tetrahedral packing with regular or irregular spherical cavities inside.
Fig. 4 is a schematic view of a tetrahedral packing with regular tetrahedral cavities inside.
Fig. 5 is a schematic view of a tetrahedral packing having a porous structure inside.
Fig. 6 is a schematic diagram of the appearance requirements of a tetrahedral packing.
Fig. 7 is a schematic diagram of the structure of the radiant refrigeration coating of the present invention.
Detailed Description
In order to better explain the present invention, the following detailed description of the technical solutions of the present invention will be given, with the described embodiments being some, but not all, embodiments of the present invention.
Example 1
The radiation refrigeration coating is prepared from the following components in parts by weight:
the preparation method of the radiation refrigeration paint comprises the following steps:
1) Adding water into a vertical reaction kettle, adding 0.3 part of cellulose ether, and dispersing and stirring for 10min at 1000 r/min; 0.6 part of dispersing agent, 0.1 part of pH regulator, 0.3 part of wetting agent, 6 parts of antifreezing agent and defoamer are continuously stirred for 10min;
2) Respectively pouring the nano titanium dioxide into a reaction kettle, adjusting the stirring speed to 1500r/min, and stirring for 20min;
3) 15 parts of emulsion, 0.5 part of film forming additive and 0.2 part of bactericide are added at the speed of 800r/min under stirring. Stirring for 20min to obtain semi-finished paint;
4) Injecting the semi-finished product paint into a dragon type stirrer, firstly injecting hollow glass beads from a feed inlet of the stirrer, uniformly mixing, and then slowly pouring tetrahedral particles into the hollow glass beads at the stirring speed of 80r/min;
the radiation refrigerating body is zirconia, and the grain diameter D90 is 100 mu m;
The stacking density of the hollow glass beads is 100-120 kg/m 3, and the particle diameter D90 is 20 mu m;
the emulsion is acrylic emulsion.
The contrast ratio of the radiation refrigeration paint obtained in the embodiment is as follows: stain resistance 0.96: 10%; the paint film with the brushing resistance (2000 times) is not damaged; alkali resistance, water resistance and heat resistance denaturation of the coating are not abnormal; water permeability 0.4mL; resistance to artificial weathering: no bubbling, no flaking and no cracking are caused during 600 hours; the solar reflectance is 0.94, the change rate of the solar reflectance after pollution is 16%, the average emissivity of the atmospheric window 8-14um is 0.98, and the average heat insulation temperature difference between days is 28 ℃ measured by adopting a device of patent ZL 202220683983.3.
Example 2
The radiation refrigeration coating is prepared from the following components in parts by weight:
the preparation method of the radiation refrigeration paint comprises the following steps:
1) Adding water into a vertical reaction kettle, adding 0.5 part of cellulose ether, and dispersing and stirring for 10min at 1000 r/min; 0.8 part of dispersing agent, 0.2 part of pH regulator, 0.5 part of wetting agent, 7 parts of antifreezing agent and defoamer are continuously stirred for 10min;
2) Respectively pouring the nano titanium dioxide into a reaction kettle, and stirring for 20min at a stirring speed of 1500 r/min.
3) 20 Parts of emulsion, 0.7 part of film forming additive and 0.3 part of bactericide are added at the speed of 800r/min under stirring. Stirring for 20min to obtain the semi-finished coating.
4) Injecting the semi-finished product paint into a dragon type stirrer, firstly injecting hollow glass beads from a feed inlet of the stirrer, uniformly mixing, then slowly pouring the tetrahedron radiation refrigerating body into the stirrer, stirring at the speed of 60r/min, uniformly mixing, adding other auxiliary agents, and stirring for 30min.
The radiation refrigerating body is zirconia, and the grain diameter D90 is 80 mu m.
The stacking density of the hollow glass beads is 200-500 kg/m 3, and the particle diameter D90 is 20 mu m.
The emulsion is silicone-acrylic emulsion.
The contrast ratio of the radiation refrigeration paint obtained in the embodiment is as follows: 0.97 stain resistance: 11%; the paint film with the brushing resistance (2000 times) is not damaged; alkali resistance, water resistance and heat resistance denaturation of the coating are not abnormal; water permeability 0.3mL; resistance to artificial weathering: no bubbling, no flaking and no cracking are caused during 600 hours; the solar reflectance is 0.93, the change rate of the solar reflectance after pollution is 14%, the average emissivity of the atmospheric window 8-14um is 0.96, and the average heat insulation temperature difference between days is 26 ℃ measured by adopting the device of patent ZL 202220683983.3.
Example 3
The radiation refrigeration coating is prepared from the following components in parts by weight:
the preparation method of the radiation refrigeration paint comprises the following steps:
1) Adding water into a vertical reaction kettle, adding 0.5 part of cellulose ether, and dispersing and stirring for 10min at 1000 r/min; 0.8 part of dispersing agent, 0.2 part of pH regulator, 0.5 part of wetting agent, 7 parts of antifreezing agent and defoamer are continuously stirred for 10min;
2) Respectively pouring the nano titanium dioxide into a reaction kettle, and stirring for 20min at a stirring speed of 1500 r/min.
3) 25 Parts of emulsion, 0.7 part of film forming additive and 0.3 part of bactericide are added at the speed of 800r/min under stirring. Stirring for 20min to obtain the semi-finished coating.
4) Injecting the semi-finished product paint into a dragon type stirrer, firstly throwing hollow glass beads from a feed inlet of the stirrer, uniformly mixing, and then slowly pouring tetrahedral particles into the hollow glass beads, wherein the stirring speed is 80r/min.
The radiation refrigerating body is alpha-type alumina, and the grain diameter D90 is 100 mu m.
The stacking density of the hollow glass beads is 150-300 kg/m 3, and the particle diameter D90 is 35 mu m.
The emulsion is polyurethane emulsion.
The contrast ratio of the radiation refrigeration paint obtained in the embodiment is as follows: 0.98, stain resistance: 10%; the paint film with the brushing resistance (2000 times) is not damaged; alkali resistance, water resistance and heat resistance denaturation of the coating are not abnormal; water permeability 0.3mL; resistance to artificial weathering: no bubbling, no flaking and no cracking are caused during 600 hours; the solar reflectance is 0.95, the change rate of the solar reflectance after pollution is 15%, the average emissivity of the atmospheric window 8-14um is 0.94, and the average heat insulation temperature difference between days is 25 ℃ measured by adopting a device of patent ZL 202220683983.3.
Example 4
The radiation refrigeration coating is prepared from the following components in parts by weight:
the preparation method of the radiation refrigeration paint comprises the following steps:
1) Adding water into a vertical reaction kettle, adding 0.5 part of cellulose ether, and dispersing and stirring for 10min at 1000 r/min; 0.8 part of dispersing agent, 0.2 part of pH regulator, 0.5 part of wetting agent, 7 parts of antifreezing agent and defoamer are continuously stirred for 10min;
2) Respectively pouring the nano titanium dioxide into a reaction kettle, and stirring for 20min at a stirring speed of 1500 r/min.
3) 25 Parts of emulsion, 0.7 part of film forming additive and 0.3 part of bactericide are added at the speed of 800r/min under stirring. Stirring for 20min to obtain the semi-finished coating.
4) Injecting the semi-finished product paint into a dragon type stirrer, firstly throwing hollow glass beads from a feed inlet of the stirrer, uniformly mixing, and then slowly pouring tetrahedral particles into the hollow glass beads, wherein the stirring speed is 80r/min.
The radiation refrigerating body is alpha-type alumina, and the grain diameter D90 is 100 mu m.
The stacking density of the hollow glass beads is 100-120 kg/m 3, and the particle size D90 is 50 mu m.
The emulsion is mixed emulsion of acrylic acid and PVA.
The contrast ratio of the radiation refrigeration paint obtained in the embodiment is as follows: 0.97 stain resistance: 10%; the paint film with the brushing resistance (2000 times) is not damaged; alkali resistance, water resistance and heat resistance denaturation of the coating are not abnormal; water permeability 0.4mL; resistance to artificial weathering: no bubbling, no flaking and no cracking are caused during 600 hours; the solar reflectance is 0.95, the change rate of the solar reflectance after pollution is 15%, the average emissivity of the atmospheric window 8-14um is 0.92, and the average heat insulation temperature difference between days is 24 ℃ measured by adopting the device of patent ZL 202220683983.3.
Example 5
The radiation refrigeration coating is prepared from the following components in parts by weight:
the preparation method of the radiation refrigeration paint comprises the following steps:
1) Adding water into a vertical reaction kettle, adding 0.5 part of cellulose ether, and dispersing and stirring for 10min at 1000 r/min; 0.8 part of dispersing agent, 0.2 part of pH regulator, 0.5 part of wetting agent, 7 parts of antifreezing agent and defoamer are continuously stirred for 10min;
2) Respectively pouring the nano titanium dioxide into a reaction kettle, and stirring for 20min at a stirring speed of 1500 r/min.
3) 25 Parts of emulsion, 0.7 part of film forming additive and 0.3 part of bactericide are added at the speed of 800r/min under stirring. Stirring for 20min to obtain the semi-finished coating.
4) Injecting the semi-finished product paint into a dragon type stirrer, firstly throwing hollow glass beads from a feed inlet of the stirrer, uniformly mixing, and then slowly pouring tetrahedral particles into the hollow glass beads, wherein the stirring speed is 80r/min.
The radiation refrigerating body is alpha-type alumina, and the grain diameter D90 is 100 mu m.
The stacking density of the hollow glass beads is 100-120 kg/m 3, and the particle size D90 is 50 mu m.
The emulsion is polyvinyl acetate emulsion.
The contrast ratio of the radiation refrigeration paint obtained in the embodiment is as follows: 0.98, stain resistance: 12%; the paint film with the brushing resistance (2000 times) is not damaged; alkali resistance, water resistance and heat resistance denaturation of the coating are not abnormal; water permeability 0.5mL; resistance to artificial weathering: no bubbling, no flaking and no cracking are caused during 600 hours; the solar reflectance is 0.95, the change rate of the solar reflectance after pollution is 16%, the average emissivity of the atmospheric window 8-14um is 0.91, and the average heat insulation temperature difference between days is 23 ℃ measured by adopting a device of patent ZL 202220683983.3.
Example 6
The radiation refrigeration coating is prepared from the following components in parts by weight:
the preparation method of the radiation refrigeration paint comprises the following steps:
1) Adding water into a vertical reaction kettle, adding 0.5 part of cellulose ether, and dispersing and stirring for 10min at 1000 r/min; 0.8 part of dispersing agent, 0.2 part of pH regulator, 0.5 part of wetting agent, 7 parts of antifreezing agent and defoamer are continuously stirred for 10min;
2) Respectively pouring the nano titanium dioxide into a reaction kettle, and stirring for 20min at a stirring speed of 1500 r/min.
3) 30 Parts of emulsion, 0.7 part of film forming additive and 0.3 part of bactericide are added at the speed of 800r/min under stirring. Stirring for 20min to obtain the semi-finished coating.
4) Injecting the semi-finished product paint into a dragon type stirrer, firstly throwing hollow glass beads from a feed inlet of the stirrer, uniformly mixing, and then slowly pouring tetrahedral particles into the hollow glass beads, wherein the stirring speed is 80r/min.
The radiation refrigerating body is alpha-type alumina, and the grain diameter D90 is 100 mu m.
The stacking density of the hollow glass beads is 100-120 kg/m 3, and the particle size D90 is 50 mu m.
The emulsion is acrylic emulsion.
The contrast ratio of the radiation refrigeration paint obtained in the embodiment is as follows: 0.98, stain resistance: 12%; the paint film with the brushing resistance (2000 times) is not damaged; alkali resistance, water resistance and heat resistance denaturation of the coating are not abnormal; water permeability 0.5mL; resistance to artificial weathering: no bubbling, no flaking and no cracking are caused during 600 hours; the solar reflectance is 0.95, the change rate of the solar reflectance after pollution is 16%, the average emissivity of the atmospheric window 8-14um is 0.91, and the average heat insulation temperature difference between days is 20 ℃ measured by adopting a device of patent ZL 202220683983.3.
Example 7
The radiation refrigeration coating is prepared from the following components in parts by weight:
the preparation method of the radiation refrigeration paint comprises the following steps:
1) Adding water into a vertical reaction kettle, adding 0.5 part of cellulose ether, and dispersing and stirring for 10min at 1000 r/min; 0.8 part of dispersing agent, 0.2 part of pH regulator, 0.5 part of wetting agent, 7 parts of antifreezing agent and defoamer are continuously stirred for 10min;
2) Respectively pouring the nano titanium dioxide into a reaction kettle, and stirring for 20min at a stirring speed of 1500 r/min.
3) 30 Parts of emulsion, 0.7 part of film forming additive and 0.3 part of bactericide are added at the speed of 800r/min under stirring. Stirring for 20min to obtain the semi-finished coating.
4) Injecting the semi-finished product paint into a dragon type stirrer, firstly throwing hollow glass beads from a feed inlet of the stirrer, uniformly mixing, and then slowly pouring tetrahedral particles into the hollow glass beads, wherein the stirring speed is 80r/min.
The radiation refrigerating body is alpha-type alumina, and the grain diameter D90 is 100 mu m.
The stacking density of the hollow glass beads is 100-120 kg/m 3, and the particle size D90 is 40 mu m.
The emulsion is acrylic emulsion.
The contrast ratio of the radiation refrigeration paint obtained in the embodiment is as follows: 0.97 stain resistance: 13%; the paint film with the brushing resistance (2000 times) is not damaged; alkali resistance, water resistance and heat resistance denaturation of the coating are not abnormal; water permeability 0.5mL; resistance to artificial weathering: no bubbling, no flaking and no cracking are caused during 600 hours; the solar reflectance is 0.92, the change rate of the solar reflectance after pollution is 17%, the average emissivity of the atmospheric window 8-14um is 0.91, and the average heat insulation temperature difference between days is 21 ℃ measured by adopting a device of patent ZL 202220683983.3.
The embodiment shows that the radiation refrigeration coating provided by the invention has excellent radiation cooling performance, can realize cooling of sub-environment at 17-23 ℃, has good anti-fouling performance and still has higher solar reflectance and infrared emissivity after pollution.
In comparative examples 1 to 6, the degree of sub-ambient cooling obtained by the heat-insulating temperature difference gradually decreases with decreasing tetrahedral radiation filler, and it is presumed that the tetrahedral radiation filler plays a critical role in cooling effect.
In comparative examples 1 to 4, when the titanium white is in a certain proportion, the increase of the proportion of the titanium white has less influence on the solar reflectance.
In comparative examples 6-7, tetrahedral radiation refrigeration filler was unchanged, and changing titanium white and hollow glass microbeads had no effect on the atmospheric window emissivity. In the system, the main material affecting the emissivity of the atmospheric window is tetrahedral radiation refrigeration filler.
The device with the same heat insulation temperature difference is adopted for testing (ZL 202220683983.3), compared with the patent CN 115449252A disclosed by the inventor before, the heat insulation temperature difference of 12-18 ℃ is generated for the sub-environment, and the heat insulation temperature difference can be 20-28 ℃, so that the tetrahedron radiation refrigerating body has obvious cooling advantage compared with the traditional spherical or spheroid powder filling.
The tetrahedral radiation refrigeration packing employed in the present invention may be shaped as a regular tetrahedron, as shown in fig. 1, having four faces and the four faces joined by six edges, which terminate at four vertices. Considering the actual shaping, fig. 2 allows defects on the points, lines, faces of the tetrahedra, allowing one or more defects to be present simultaneously, forming irregularities. The tetrahedral particles internally allow for a variety of states: the inside of fig. 1 is filled with full radiator material, the inside of fig. 3 is a regular or irregular spherical cavity, the inside of fig. 4 is a tetrahedral filler of a regular tetrahedral cavity, and the thickness is uniform, and the inside of the tetrahedral particle is in a porous (connected or disconnected) structure as shown in fig. 5.
Fig. 6 is a schematic diagram of the appearance requirements of a tetrahedral packing: perpendicular lines are drawn from the vertexes of the tetrahedron filler to the corresponding surfaces, namely the unconnected surfaces, and the perpendicular lines from the four vertexes to the corresponding surfaces, as drawn in fig. 6, are respectively 1 high, 2 high, 3 high and 4 high, the standard deviation values of the four lines are controlled to be less than 40 mu m, and the radius of the externally connected sphere of the tetrahedron is controlled to be less than 100 mu m so as to control the shape of the tetrahedron to be excessively flat or extremely sharp.
The tetrahedral radiation refrigerating particle has certain surface roughness, ra less than or equal to 0.8 microns and Rz less than or equal to 3.2 microns. The tetrahedron of zirconia material has high surface finish after grinding, mirror surface reflection to sunlight and chemical polishing, electrolytic polishing, ultrasonic polishing, fluid polishing and magnetic fluid grinding and polishing.
The radiation refrigeration paint is applied in a spraying mode, and the tetrahedron radiation refrigeration paint is smoothly sunk into the roof due to the gravity center of the structure after free deposition, and is also suitable for roller coating when being used for roof leveling structures. When the paint is used for the vertical face of the outer wall, the paint is more favorable for spreading tetrahedral particles.
The present invention is not limited to the above embodiments, and all modifications made according to the principles of the present invention are within the scope of the present invention.
Claims (5)
1. A radiation refrigeration coating for a building is characterized in that: the composite material is prepared from the following components in parts by weight: 5-45 parts of tetrahedral radiation refrigeration filler, 3-25 parts of titanium dioxide, 2-5 parts of hollow glass beads, 15-30 parts of emulsion, 8-10 parts of functional auxiliary agent and 20-25 parts of water;
The tetrahedral radiation refrigeration filler is tetrahedral particles which are made of aluminum oxide and zirconium oxide and have the diameter of a circumcircle ranging from 1 mu m to 100 mu m.
2. A radiant refrigeration paint for construction as set forth in claim 1 wherein: the titanium dioxide is nano titanium dioxide with the grain size less than or equal to 300 nm.
3. A radiant refrigeration paint for construction as set forth in claim 1 wherein: the emulsion is one of acrylic emulsion, polyvinyl acetate emulsion, silicone-acrylate emulsion, polyurethane emulsion or polyvinyl alcohol.
4. A radiant refrigeration paint for construction as set forth in claim 1 wherein: the functional auxiliary agent is one or any combination of more than two of film forming auxiliary agent, wetting agent, cellulose, pH regulator, defoamer, antifreezing agent or bactericide.
5. A method for preparing a radiation refrigeration paint for construction according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
firstly, stirring water, emulsion, functional auxiliary agent and titanium pigment into mixed liquor by adopting a vertical stirrer with a dispersion disk, then uniformly stirring the mixed liquor and hollow glass beads on a dragon stirrer, and finally adding tetrahedral radiation refrigeration filler and uniformly stirring to obtain the radiation refrigeration coating for the building.
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| CN114316707A (en) * | 2022-01-13 | 2022-04-12 | 中交四航工程研究院有限公司 | A kind of multifunctional fair-faced concrete surface protective coating material and preparation method thereof |
| CN114714692A (en) * | 2022-05-10 | 2022-07-08 | 哈尔滨工业大学（威海） | Visible-near infrared frequency division type radiation refrigeration film based on bionic rose petal micro-nano structure and preparation method and application thereof |
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| JPH0788251B2 (en) * | 1985-11-06 | 1995-09-27 | 株式会社日立製作所 | Zirconia sintered body |
| US4920014A (en) * | 1987-02-27 | 1990-04-24 | Sumitomo Metal Mining Co., Ltd. | Zirconia film and process for preparing it |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114316707A (en) * | 2022-01-13 | 2022-04-12 | 中交四航工程研究院有限公司 | A kind of multifunctional fair-faced concrete surface protective coating material and preparation method thereof |
| CN114714692A (en) * | 2022-05-10 | 2022-07-08 | 哈尔滨工业大学（威海） | Visible-near infrared frequency division type radiation refrigeration film based on bionic rose petal micro-nano structure and preparation method and application thereof |
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