CN109233493B - High-reflectivity acrylic acid heat-shielding coating and preparation method thereof - Google Patents
High-reflectivity acrylic acid heat-shielding coating and preparation method thereof Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- 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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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C—CHEMISTRY; METALLURGY
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- 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
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
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- C08K7/28—Glass
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
Abstract
The invention relates to a high-reflectivity acrylic acid heat-shielding paint and a preparation method thereof, wherein the high-reflectivity acrylic acid heat-shielding paint comprises the following components: 20-55 wt% of acrylic resin, 10-33 wt% of titanium dioxide, 6-12 wt% of modified aluminum powder, 3.2-7.6 wt% of heat-insulating functional filler, 9-17 wt% of mixed solvent and the balance of auxiliary agent, wherein the sum of the mass percentages of the components is 100%; the modified aluminum powder is flaky aluminum powder coated with titanium dioxide on the surface. According to the invention, the acrylic resin is used as a film material, the high-reflectivity flake aluminum powder and the titanium dioxide coated on the surface are added, and the heat-insulating functional filler with good heat-insulating property and extremely low heat transfer coefficient is added, so that the heat-reflecting coating disclosed by the invention has the characteristics of integrating solar ray reflection, infrared light wave radiation and heat conduction blocking, and has good heat-insulating and cooling effects.
Description
Technical Field
The invention relates to a high-reflectivity acrylic acid heat-shielding coating and a preparation method thereof, belonging to the technical field of heat-shielding coatings.
Background
Along with the improvement of living standard, the demand of people on energy is increasing day by day, the energy consumed by the building industry in China occupies one fourth of the total energy consumption, and the energy consumed by refrigeration and heating occupies more than half of the total energy consumption of the building industry, and is increased gradually year by year. Therefore, the heat reflection type heat-shielding energy-saving coating has quite remarkable research significance. The coating is coated on the outer surface of an object, so that the accumulation of heat on the surface of a coating and the transmission of heat in the coating can be reduced, the temperature of the outer surface is reduced, and the aim of reducing the temperature in the object is fulfilled. The coating is applied to the outer wall or the roof of a building, can realize the heat preservation purpose of reflection and radiant heat, keep the indoor temperature constant, increase the temperature difference between the indoor and the outdoor, and reduce the energy consumption of an air conditioner in summer; and can play the functions of decorating and protecting walls or roofs, dewatering, resisting pollution and the like.
In addition to applications for building exterior walls or roofs, there are many other applications for such coatings. It is known that seeds can breathe without oxygen to release heat in a closed environment, and grains can mildew at a higher temperature, so that energy is consumed to drive a cooling facility to ensure the normal state of the grains; in addition, the oil tank directly exposed to the sun radiation absorbs the energy of the sun, so that the temperature rises, and when the temperature rises to a certain degree, the oil tank can explode to harm the life safety and property safety of people; in cities, the heat island effect is common because green vegetation areas in cities are small, and black asphalt roads and asphalt pavements absorb heat, so that the environmental temperature of the cities is 3-5 ℃ higher than that of the rural areas. Therefore, the coating has good application in the fields of granaries, oil tanks, road surfaces and the like.
In recent years, researches on heat-insulating coatings at home and abroad are more, and the conventional CN 104830178A discloses a solar heat reflection heat-insulating coating for metal surfaces and a preparation method and application thereof, wherein the solar reflectance of the coated film is more than 0.9, but the thickness of the coated film needs to be more than 2mm, which is not ideal. CN 1583894 discloses a preparation method of heat-insulating reflective coating, wherein the thickness of a dry film is 0.3-0.8 mm, the average reflectivity to heat rays is above 0.9, but the surface temperature of a substrate can only be reduced by 10-20 ℃, and the cooling effect is not ideal. The coating in the prior art can not achieve a high reflection effect with a low thickness, so that the accumulation and transmission of more heat of the wall surface are caused, the room temperature is increased, and the heat insulation performance of the coating is poor.
Disclosure of Invention
Aiming at the defects and problems in the prior art, the modified aluminum powder (flaky aluminum powder coated with titanium dioxide) is added, and the heat-shielding coating with low thickness and high sunlight reflectivity and the preparation method thereof are provided.
In one aspect, the present invention provides a high reflectance acrylic heat shield paint, comprising: 20-55 wt% of acrylic resin, 10-33 wt% of titanium dioxide, 6-12 wt% of modified aluminum powder, 3.2-7.6 wt% of heat-insulating functional filler, 9-17 wt% of mixed solvent and the balance of auxiliary agent, wherein the sum of the mass percentages of the components is 100%;
the modified aluminum powder is flaky aluminum powder coated with titanium dioxide on the surface.
The invention takes acrylic resin as a film forming substance, and adds high-reflectivity modified aluminum powder (flaky aluminum powder coated with titanium dioxide on the surface), titanium dioxide and heat-insulating functional filler with good heat-insulating property and extremely low heat transfer coefficient. The modified aluminum powder and the titanium dioxide enable the heat-shielding coating to reflect most of the solar rays; meanwhile, the modified aluminum powder radiates out the heat absorbed by the matrix in the form of infrared light waves; finally, the heat insulation functional filler with extremely low heat transfer coefficient can prevent the heat accumulated on the surface of the matrix from being conducted to the interior of the matrix. The titanium dioxide has extremely high dielectric constant, excellent covering power and oxidation resistance on the surface of the aluminum powder of the modified aluminum powder, and improves the dispersibility, corrosion resistance and oxidation resistance of the flaky aluminum powder while exerting the excellent reflection performance of the aluminum sheet.
Preferably, the acrylic resin is at least one of hydroxyl acrylic resin, epoxy acrylic resin, polyester acrylic resin and polyurethane acrylic resin.
Preferably, the titanium dioxide is rutile type titanium dioxide, and the particle size range of the titanium dioxide is 200-900 nm.
Preferably, the particle size of the modified aluminum powder is 10-20 μm.
Preferably, the heat-insulating functional filler is hollow glass beads, and the particle size range of the hollow glass beads is 5-60 mu m.
Preferably, the mixed solvent is a mixture of butyl acetate, xylene and a high boiling point solvent DBE (dibasic ester).
In addition, preferably, the mass percentage ratio of each component in the mixed solvent to the total mass of the high-reflectivity acrylic heat-shielding coating is as follows: 5.5-10 wt% of dimethylbenzene, 3.2-5.6 wt% of butyl acetate and 0.5-1 wt% of DBE (DBE) as a high-boiling-point solvent.
Preferably, the auxiliary agent is at least one selected from a dispersing agent, a leveling agent, an antifoaming agent and an anti-settling agent.
Preferably, the mass percentage of each component in the auxiliary agent in the total mass of the high-reflectivity acrylic heat-shielding coating is as follows: 1 to 3.3 wt% of dispersing agent, 0.4 to 1wt% of flatting agent, 0.4 to 1wt% of defoaming agent and 0.5 to 1.2 wt% of anti-settling agent.
On the other hand, the invention also provides a preparation method of the high-reflectivity acrylic heat-shielding paint, which comprises the following steps:
stirring acrylic resin, a mixed solvent and various auxiliaries for 10-30 minutes at the speed of 800-1000 r/min;
then adding titanium dioxide and stirring for 40-80 minutes at 2000-3000 r/min;
and finally, adding modified aluminum powder and heat-insulating functional filler, and stirring for 30-60 minutes at a speed of 100-300 r/min to obtain the high-reflectivity acrylic heat-shielding coating.
Preferably, butyl titanate is added into the ethanol solution of the flake aluminum powder to react for 4-6 hours at 50-70 ℃ to obtain the modified aluminum powder.
In addition, the ratio of the butyl titanate to the aluminum flake is preferably 2-4 g of aluminum flake per 10ml of butyl titanate.
On the other hand, the invention also provides a coating prepared from the high-reflectivity acrylic heat-shielding coating, wherein the dry film thickness of the coating is 20-130 mu m, and the average reflectivity to sunlight is 85-90%.
The heat-reflecting coating disclosed by the invention is prepared by adopting acrylic resin (such as hydroxyl acrylic emulsion and the like) to prepare a film material, adding high-reflectivity modified aluminum powder (flaky aluminum powder with the surface coated with titanium dioxide), titanium dioxide and a heat-insulating functional filler with good heat-insulating property and extremely low heat transfer coefficient, so that the heat-reflecting coating disclosed by the invention has the characteristics of three-in-one of reflecting solar rays, radiating infrared light waves and blocking heat transfer, and has good heat-insulating and temperature-reducing effects. The modified aluminum powder and the titanium dioxide enable the heat-shielding coating to reflect most of the solar rays; meanwhile, the modified aluminum powder radiates out the heat absorbed by the matrix in the form of infrared light waves; finally, the heat insulation functional filler with extremely low heat transfer coefficient can prevent the heat accumulated on the surface of the matrix from being conducted to the interior of the matrix. Through extensive and intensive research, the inventor prepares the reflective heat-insulating coating with the average reflectivity of sunlight (with the wavelength of 300-2500 nm) of more than 85%, the average reflectivity of an infrared band (with the wavelength of 780-2500 nm) of more than 88% and the heat-insulating temperature difference of 25-30 ℃ by improving the preparation process.
Drawings
FIG. 1 is a reflectance spectrum at a wavelength of 200 to 2500nm of the coating (dry coating film) prepared in examples 1 to 4.
Detailed Description
The present invention is further illustrated by the following examples, which are to be understood as merely illustrative and not restrictive.
According to the invention, rutile titanium dioxide, aluminum powder and heat-insulating functional filler are utilized, and the particle size ratio which is in accordance with the solar wavelength is matched, so that the heat transfer is blocked in all aspects and at multiple angles, and the final purposes of heat insulation, temperature reduction and energy saving are achieved. The prepared coating comprises the following components: 30-55 wt% of acrylic resin, 10-33 wt% of titanium dioxide, 6-12 wt% of modified aluminum powder, 3.2-7.6 wt% of heat-insulating functional filler, 9-17 wt% of mixed solvent and the balance of auxiliary agent, wherein the sum of the mass percentages of the components is 100%. The modified aluminum powder can be flake aluminum powder coated with titanium dioxide on the surface.
The acrylic resin is at least one of hydroxyl acrylic resin, epoxy acrylic resin, polyester acrylic resin and polyurethane acrylic resin. The titanium dioxide can be rutile titanium dioxide with the particle size range of 200-900 nm. The aluminum powder is flaky aluminum powder coated by titanium dioxide, and the particle size range is 10-20 mu m. The heat-insulating functional filler can be hollow glass beads, and the particle size range is 10-30 mu m.
The mixed solvent is butyl acetate, xylene and high boiling point solvent DBE (dibasic ester). The mass percentage ratio of each component in the mixed solvent is preferably as follows: 5.5-10 wt% of dimethylbenzene, 3.2-5.6 wt% of butyl acetate and 0.5-1 wt% of DBE (DBE) as a high-boiling-point solvent.
The auxiliary agent may be at least one selected from a dispersing agent, a leveling agent, an antifoaming agent and an anti-settling agent, and preferably includes a dispersing agent (e.g., BYK-161 dispersing agent, BYK-163 dispersing agent, Silok-7455 dispersing agent, etc.), a leveling agent (e.g., 432 leveling agent, BYK-333 leveling agent, etc.), an antifoaming agent (e.g., 5500 antifoaming agent, BYK-141 antifoaming agent, etc.), and an anti-settling agent (e.g., 202P anti-settling agent, B-75 anti-settling agent, etc.). Preferably, the auxiliary agent comprises the following components in percentage by mass: 1 to 3.3 wt% of dispersing agent, 0.4 to 1wt% of flatting agent, 0.4 to 1wt% of defoaming agent and 0.5 to 1.2 wt% of anti-settling agent.
As an example, the prepared heat-shielding coating is characterized by comprising the following components in percentage by mass: 30-55 wt% of 7119-X-50 hydroxyl acrylic resin, 10-33 wt% of rutile titanium dioxide, 6-12 wt% of modified aluminum powder, 3.2-7.6 wt% of hollow glass microspheres, 5.5-10 wt% of xylene, 3.2-5.6 wt% of butyl acetate, 0.5-1 wt% of high boiling point solvent DBE, 1-3.3 wt% of dispersing agent, 0.4-1 wt% of flatting agent, 0.4-1 wt% of defoaming agent, 0.5-1.2 wt% of anti-settling agent, and the sum of the mass percentages of the components is 100%.
The following is an exemplary description of the preparation method of the high-reflectivity acrylic heat-shielding coating provided by the present invention.
And preparing modified aluminum powder. And adding butyl titanate into the ethanol solution of the flake aluminum powder, and reacting for 4-6 hours at 50-70 ℃ to obtain the modified aluminum powder. The ratio of the butyl titanate to the flaky aluminum powder can be 2-4 g of flaky aluminum powder per 10ml of butyl titanate. As an example, adding aluminum powder into absolute ethyl alcohol for ultrasonic dispersion, and stirring at 50-70 ℃ for 30-50 min; adding butyl titanate, continuously stirring for 4-6 h, standing to obtain white and grey precipitate, centrifuging, filtering, and drying at 100 ℃.
Stirring acrylic resin (acrylic emulsion), mixed solvent and various auxiliaries at the speed of 800-1000 r/min. As an example, xylene, butyl acetate, a high boiling point solvent DBE, a dispersing agent, a leveling agent, a defoaming agent and an anti-settling agent are respectively added into hydroxy acrylic resin, and the mixture is stirred for 10-30 min at the speed of 800-1000 r/min.
Then adding nano titanium oxide (titanium dioxide) and stirring at a high speed of 2000-3000 r/min for 40-80 min.
And finally, adding modified aluminum powder and hollow glass beads, and stirring at a low speed of 100-300 r/min for 30-60 min to prepare the high-reflectivity acrylic heat-shielding coating.
The invention has the advantages that the heat reflection coating with better performance is prepared by compounding the rutile type titanium dioxide with high refractive index, the modified aluminum powder (the sheet aluminum powder coated by the titanium dioxide) and the heat insulation functional material with low heat conductivity coefficient (such as the hollow glass microspheres) and matching the powder proportion which is compounded by multi-level particle sizes and accords with the solar light wavelength, and the process is extremely simple and easy to operate. Experiments prove that the coating added with the modified aluminum powder can realize the temperature reduction of the metal surface by more than 25 ℃, can effectively reduce the energy consumption of enterprises and improve the economic benefit.
The invention also provides a coating (dry coating film) prepared by using the high-reflectivity acrylic heat-shielding coating. The preparation method comprises the steps of spraying, blade coating, direct coating and room temperature drying for 2 days (d). The substrate used may be metal, ceramic, etc. The thickness of the dry film coating can be adjusted according to the requirement, and generally can be 20-130 μm, and preferably is 80-130 μm.
Coating reflectivity test and thermal insulation temperature difference experiment: and coating the high-reflectivity acrylic acid heat-shielding paint on the surface of an aluminum plate, and drying (naturally drying at room temperature for 2d) to obtain a coating with the thickness of 150 x 75mm and the thickness of 80-130 mu m. And simulating sunlight irradiation at 25 ℃, and testing R (780-2500 nm) by adopting an ultraviolet visible infrared spectrophotometer according to the standard JGT 235-2014. The coated aluminum and black sample panels were then irradiated at a laboratory temperature of 25C with simulated sunlight and the temperature of the back side of the two panels was measured with an adiabatic temperature difference of 25C or more (test standards and methods in accordance with MIL-E-46096C).
Adhesion rating test (the standard test is the national standard test GB/T9286).
Water contact angle test: the water contact angle of the coating surface was measured by the pendant drop method. Water immersion resistance test: a normal-temperature soaking experimental method is adopted.
The present invention will be described in detail by way of examples. It is also to be understood that the following examples are illustrative of the present invention and are not to be construed as limiting the scope of the invention, and that certain insubstantial modifications and adaptations of the invention by those skilled in the art may be made in light of the above teachings. The specific process parameters and the like of the following examples are also only one example of suitable ranges, i.e., those skilled in the art can select the appropriate ranges through the description herein, and are not limited to the specific values exemplified below. Unless otherwise specified, the reagents used in the present invention include: hydroxyl acrylic resin (Technao resin Co., Ltd., 7119-X-50), titanium dioxide (particle size range 200-900 nm, new Yunnan, R-803), modified aluminum powder, xylene, butyl acetate, a high boiling point solvent (Shanghai De Co., Ltd., dibasic ester DBE), a leveling agent (Dow, 245 leveling agent), an antifoaming agent (BYK-Gardner Co., Ltd., BYK-065), an anti-settling agent (Demodernia chemical Co., Ltd., 202P), hollow glass beads (particle size range 10-30 μm, Shanghai Shaxu chemical Co., Ltd.).
Example 1:
the weight percentage is as follows: 44% of hydroxyl acrylic resin (Techgan resin Co., Ltd., 7119-X-50), 26% of R-803 titanium dioxide (with the particle size range of 200-900 nm), 9% of modified aluminum powder (flaky aluminum powder coated with titanium dioxide), 8% of xylene, 5% of butyl acetate, 1% of high-boiling point solvent DBE (dibasic ester), 0.5% of flatting agent 245, 0.5% of BYK-065 defoaming agent, 1% of 202P anti-settling agent and 5% of hollow glass microspheres (with the particle size range of 10-30 mu m, Shanghai Shaxu chemical Co., Ltd.);
the preparation method comprises the following steps: adding 6g of flake aluminum powder (with the particle size range of 8-15 microns) into 200ml of absolute ethyl alcohol for ultrasonic dispersion, stirring for 30min at 60 ℃, adding 20ml of butyl titanate, continuously stirring for 6h, standing to obtain a white grey precipitate, performing centrifugal filtration, and drying at 100 ℃ to obtain the modified aluminum powder. Stirring hydroxyl acrylic resin, a solvent and various auxiliary agents at a medium speed of 800r/min for 10min, then adding nano-scale titanium oxide at a high speed of 2500r/min for stirring for 40min, finally adding modified aluminum powder, stirring at a speed of 300r/min for 30min to prepare the coating with a heat shielding function, taking an aluminum plate as a substrate, covering the obtained coating on the surface of the substrate by adopting a blade coating method, and drying (naturally drying at room temperature for 2d) to obtain the coating. The thickness of the coating was 80 μm. The results of the performance tests of the coatings prepared are shown in table 1 and fig. 1.
Example 2:
the weight percentage is as follows: 46% of hydroxyl acrylic resin (Taichang resin Co., Ltd., 7119-X-50), 23% of titanium white titanium dioxide (with the particle size range of 200-900 nm, Yunnan Xinli, R-803), 5% of hollow glass microspheres (with the particle size range of 10-30 μm, Shanghai Zhexu chemical Co., Ltd.), 9% of modified aluminum powder (sheet aluminum powder coated with titanium dioxide on the surface), 7.5% of dimethylbenzene, 4.5% of butyl acetate, 0.9% of high-boiling point solvent DBE, 2% of BYK-161 dispersant, 0.44% of 245 flatting agent, 0.66% of BYK-065 defoaming agent and 1% of 202P anti-settling agent;
the preparation method comprises the following steps: adding 6g of flaky aluminum powder (with the particle size range of 8-15 microns) into 200ml of absolute ethyl alcohol for ultrasonic dispersion, stirring for 30min at 60 ℃, adding 20ml of butyl titanate, continuing stirring for 6h, standing to obtain a white grey precipitate, performing centrifugal filtration, and drying at 100 ℃ to obtain modified aluminum powder; stirring hydroxyl acrylic emulsion (hydroxyl acrylic resin), solvent and various auxiliary agents at a medium speed of 800r/min for 10min, then adding nano-scale titanium oxide at a high speed of 2500r/min and stirring for 40min, then adding hollow glass beads and aluminum powder, and stirring at a low speed of 200r/min for 30min to prepare the coating with the functions of reflection and heat shielding. And (3) taking an aluminum plate as a substrate, covering the obtained coating on the surface of the substrate by adopting a blade coating method, and drying (naturally drying at room temperature for 2d) to obtain the coating. The coating thickness was 100. mu.m. The results of the performance tests of the coatings prepared are shown in table 1 and fig. 1.
Example 3:
the weight percentage is as follows: 46% of hydroxyl acrylic resin (Techgan resin Co., Ltd., 7119-X-50), 23% of titanium dioxide (particle size range of 200-900 nm, Yunan Xinli, R-803), 9% of modified aluminum powder (flaky aluminum powder coated with titanium dioxide on the surface), 7.7% of xylene, 4% of hollow glass microspheres (particle size range of 10-30 μm, Shanghai Zheng Xu chemical Co., Ltd.), 5% of butyl acetate, 1% of high-boiling point solvent DBE, 2.3% of BYK-161 dispersant, 0.5% of flatting agent 245, 0.5% of BYK-065 defoamer and 1% of 202P anti-settling agent;
the preparation method comprises the following steps: adding 6g of flaky aluminum powder (with the particle size range of 8-15 microns) into 200ml of absolute ethyl alcohol for ultrasonic dispersion, stirring for 30min at 60 ℃, adding 20ml of butyl titanate, continuing stirring for 6h, standing to obtain a white grey precipitate, performing centrifugal filtration, and drying at 100 ℃ to obtain modified aluminum powder; stirring the hydroxyl acrylic emulsion, the solvent and various auxiliary agents for 20min at the speed of 1000r/min, then adding the nano-scale titanium oxide and stirring for 40min at the speed of 2500r/min, finally adding the aluminum powder and stirring for 20min at the speed of 300r/min to prepare the coating with the functions of reflection and heat shielding. And (3) taking an aluminum plate as a substrate, covering the obtained coating on the surface of the substrate by adopting a blade coating method, and drying (naturally drying at room temperature for 2d) to obtain the coating. The thickness of the coating was 90 μm. The results of the performance tests of the coatings prepared are shown in table 1 and fig. 1.
Example 4:
the weight percentage is as follows: 40% of hydroxyl acrylic resin (Taichang resin Co., Ltd., 7119-X-50), 24% of titanium dioxide (with the particle size range of 200-900 nm, Yunan Xinli, R-803), 9% of modified aluminum powder (flake aluminum powder coated with titanium dioxide on the surface), 7.6% of hollow glass microspheres (with the particle size range of 10-30 μm, Shanghai Shaxu chemical Co., Ltd.), 8.5% of dimethylbenzene, 5.4% of butyl acetate, 1.1% of high-boiling point solvent DBE, 2.2% of dispersant, 0.44% of 245 leveling agent, 0.66% of BYK-065 defoaming agent and 1.1% of 202P anti-settling agent;
the preparation method comprises the following steps: adding 6g of flaky aluminum powder (with the particle size range of 8-15 microns) into 200ml of absolute ethyl alcohol for ultrasonic dispersion, stirring for 30min at 60 ℃, adding 20ml of butyl titanate, continuing stirring for 6h, standing to obtain a white grey precipitate, performing centrifugal filtration, and drying at 100 ℃ to obtain modified aluminum powder; the hydroxy acrylic emulsion, the solvent and various auxiliary agents are stirred for 20min at a medium speed of 800r/min, then the nano-scale titanium oxide is added and stirred for 30min at a high speed of 3000r/min, then the hollow glass beads and the aluminum powder are added, and the mixture is stirred for 20min at a low speed of 300r/min to prepare the coating with the reflective heat insulation function. And (3) taking an aluminum plate as a substrate, covering the obtained coating on the surface of the substrate by adopting a blade coating method, and drying (naturally drying at room temperature for 2d) to obtain the coating. The coating thickness was 87. mu.m. The results of the performance tests of the coatings prepared are shown in table 1 and fig. 1.
Table 1 shows the results of the performance tests of the coatings prepared in examples 1 to 4 of the present invention:
FIG. 1 is a graph showing the reflectance at a wavelength of 200 to 2500nm of the coating (dry coating film) prepared in example 1-4, and it can be seen that the reflectance of most of the visible light region (wavelength of 450 to 780nm) of the coating prepared in example 1-4 is 90% or more, and the reflectance of the coating in the near infrared region (wavelength of 780 to 2500nm) is maintained high.
Claims (9)
1. A high reflectance acrylic heat shield paint, comprising: 30-55 wt% of acrylic resin, 23-33 wt% of titanium dioxide, 6-12 wt% of modified aluminum powder, 3.2-7.6 wt% of heat-insulating functional filler, 9-17 wt% of mixed solvent and the balance of auxiliary agent, wherein the sum of the mass percentages of the components is 100%;
the modified aluminum powder is flaky aluminum powder coated with titanium dioxide on the surface;
the titanium dioxide is rutile titanium dioxide, and the particle size range of the titanium dioxide is 200-900 nm;
the particle size range of the modified aluminum powder is 10-20 mu m;
the heat insulation functional filler is hollow glass beads, and the particle size range of the filler is 5-60 mu m.
2. The high reflectance acrylic heat shield paint according to claim 1, wherein the acrylic resin is at least one of hydroxyl acrylic resin, epoxy acrylic resin, polyester acrylic resin, and urethane acrylic resin.
3. The high reflectance acrylic heat shield paint as claimed in claim 1, wherein the mixed solvent is a mixture of xylene, a high boiling point solvent DBE and butyl acetate.
4. The high-reflectivity acrylic heat-shielding paint according to claim 1, wherein the mass percentage ratio of each component in the mixed solvent to the total mass of the high-reflectivity acrylic heat-shielding paint is as follows: 5.5-10 wt% of dimethylbenzene, 3.2-5.6 wt% of butyl acetate and 0.5-1 wt% of DBE (DBE) as a high-boiling-point solvent.
5. The high reflectance acrylic heat shield paint according to any one of claims 1 to 4, wherein the auxiliary agent is at least one selected from the group consisting of a dispersant, a leveling agent, an antifoaming agent and an anti-settling agent.
6. The high-reflectivity acrylic heat-shielding paint according to claim 5, wherein the auxiliary agent comprises the following components in percentage by mass based on the total mass of the high-reflectivity acrylic heat-shielding paint: 1 to 3.3 wt% of dispersing agent, 0.4 to 1wt% of flatting agent, 0.4 to 1wt% of defoaming agent and 0.5 to 1.2 wt% of anti-settling agent.
7. A method for preparing the high-reflectivity acrylic heat-shielding paint according to any one of claims 1 to 6, which comprises the following steps:
stirring acrylic resin, a mixed solvent and various auxiliaries for 10-30 minutes at the speed of 800-1000 r/min;
then adding titanium dioxide and stirring for 40-80 minutes at 2000-3000 r/min;
and finally, adding modified aluminum powder and heat-insulating functional filler, and stirring for 30-60 minutes at a speed of 100-300 r/min to obtain the high-reflectivity acrylic heat-shielding coating.
8. The preparation method of claim 7, wherein the butyl titanate is added into the ethanol solution of the aluminum flake, and the reaction is carried out at 50-70 ℃ for 4-6 hours to obtain the aluminum flake coated with titanium dioxide.
9. A coating prepared from the high-reflectivity acrylic heat-shielding paint as claimed in any one of claims 1 to 6, wherein the dry film thickness of the coating is 20 to 130 μm, and the average reflectivity to sunlight is 85 to 90%.
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| CN110684380A (en) * | 2019-09-27 | 2020-01-14 | 济宁明德环保科技有限公司 | Low-emissivity coating for improving incineration efficiency of rotary kiln incinerator and preparation method and coating process thereof |
| CN114163853B (en) * | 2020-12-29 | 2023-02-10 | 中国科学院宁波材料技术与工程研究所 | High-radiation slurry and preparation method and application thereof |
| CN113462272B (en) * | 2021-06-15 | 2022-04-19 | 厦门双瑞船舶涂料有限公司 | Heat-insulating radiation-proof coating and preparation method thereof |
| CN113913086A (en) * | 2021-11-10 | 2022-01-11 | 金华联创塑粉科技有限公司 | High-reflectivity coating and preparation method and application thereof |
| CN114316716A (en) * | 2021-12-07 | 2022-04-12 | 广东美涂士建材股份有限公司 | High-temperature-resistant light-reflection environment-friendly water-based paint and preparation method thereof |
| CN114836099A (en) * | 2022-04-29 | 2022-08-02 | 江苏金陵特种涂料有限公司 | Super-weather-resistant heat-insulating reflective coating and preparation method thereof |
| CN116285510A (en) * | 2023-04-24 | 2023-06-23 | 上海庸信新材料科技有限公司 | Thermoplastic light guide coating composition, preparation method and application thereof |
| CN117304758A (en) * | 2023-10-23 | 2023-12-29 | 江西省科学院应用化学研究所 | Preparation method of heat-insulating reflective building energy-saving nano material |
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