CN114854255A - Composite infrared reflection coating and preparation method thereof - Google Patents
Composite infrared reflection 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
- C09D127/00—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 a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/16—Homopolymers or copolymers of vinylidene fluoride
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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
- C09D101/00—Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
- C09D101/08—Cellulose derivatives
- C09D101/10—Esters of organic acids
- C09D101/12—Cellulose acetate
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- C09D125/00—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 aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/06—Polystyrene
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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
- 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
- C09D133/04—Homopolymers or copolymers of esters
- C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09D133/10—Homopolymers or copolymers of methacrylic acid esters
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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
- C09D5/08—Anti-corrosive paints
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Abstract
The invention discloses a composite infrared reflection coating and a preparation method thereof. The preparation method of the composite infrared reflection coating comprises the following steps: providing an organic solution; dispersing infrared reflection particles into the organic solution, and uniformly stirring to obtain an infrared reflection coating; and coating the infrared reflection coating on a substrate to obtain the composite infrared reflection coating. Therefore, the infrared reflection effect of the composite infrared reflection coating can be effectively improved by adding the particles with the infrared reflection function into the organic material.
Description
Technical Field
The invention relates to the field of coatings, in particular to a composite infrared reflection coating and a preparation method thereof.
Background
The coating capable of reflecting near infrared radiation is a coating having a function of reflecting near infrared electromagnetic waves, and can reduce the temperature of outdoor objects exposed to the sun. When an object is exposed to the sun, energy is continuously accumulated, so that the temperature of the object is continuously increased, and high temperature generally has adverse effects on the function, the service life and the like of the object. The coating can reflect the energy of infrared wave bands in sunlight by coating the coating which reflects near infrared radiation on the surface of an object, thereby realizing the purposes of effectively reducing the surface temperature of the object exposed to the sun without consuming energy (certainly, more effectively reducing the internal temperature of the object), preventing the heat from being conducted into the object from the source, saving energy, reducing consumption and improving safety.
However, the existing infrared reflective coating and the preparation method thereof still have shortcomings and need to be improved and enhanced.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
at present, most infrared reflection coatings adopt metal coatings, acrylic resin coatings and the like, and the defects mainly comprise: the cost is high; the application scene is limited, and the paint can only be applied to the outer wall of a building, the roof, the surface of an automobile, an oil tank and the like; the durability is poor and further improvement is required. The inventor finds that the infrared reflection efficiency of the composite coating can be remarkably improved by compounding an organic material and an inorganic material and introducing one or more inorganic materials with high reflectivity. Meanwhile, the coating prepared by the method can be simply and effectively coated on the surfaces of various materials, such as the surfaces of chemical fibers, wood, metal and the like, the use scene is not limited, and the coating has wide application prospect and has better weather resistance and corrosion resistance.
In view of the above, in one aspect of the present invention, a method for preparing a composite infrared reflective coating is provided. The method comprises the following steps: providing an organic solution; dispersing infrared reflection particles into the organic solution, and uniformly stirring to obtain an infrared reflection coating; and coating the infrared reflection coating on a substrate to obtain the composite infrared reflection coating. Therefore, the infrared reflection effect of the composite infrared reflection coating can be effectively improved by adding the particles with the infrared reflection function into the organic material.
According to an embodiment of the invention, the infrared reflective particles comprise at least one of barium titanate, hollow glass microspheres and mica platelets.
According to an embodiment of the invention, the infrared-reflective particles have a particle size of 5nm to 50 μm.
According to an embodiment of the present invention, the solute of the organic solution includes at least one of PVDF-HFP, PMMA, polystyrene, and cellulose acetate, and the solvent of the organic solution is acetone; in the organic solution, the mass fraction of the solute is 5 to 45 percent.
According to an embodiment of the present invention, the step of obtaining the infrared reflective coating comprises: dispersing the infrared reflection particles into the organic solution, and carrying out first stirring to obtain a first mixed solution; and dropwise adding deionized water into the first mixed solution, and carrying out second stirring to obtain the infrared reflection coating.
According to an embodiment of the present invention, the volume fraction of the infrared reflective particles is 3% to 15% based on the total volume of the first mixed liquid.
According to the embodiment of the invention, the mass ratio of the solute to the deionized water is 4/5-4/3.
According to an embodiment of the invention, the step of obtaining the composite infrared reflective coating comprises: coating the infrared reflection coating on the substrate to obtain a coating layer; removing the solvent in the coating layer so that the solute and the deionized water are subjected to phase separation; and removing the deionized water in the coating layer subjected to the phase separation to obtain the composite infrared reflection coating.
According to an embodiment of the invention, the thickness of the coating layer is 20 μm to 500 μm.
In another aspect of the invention, a composite infrared reflective coating is provided that is prepared using the method described above. Therefore, the composite infrared reflection coating has all the characteristics and advantages of the preparation method, and the details are not repeated herein. In general, the composite infrared reflection coating has the advantages of simple preparation, low cost, excellent weather resistance and corrosion resistance, excellent infrared reflection performance and the like, and has wide application prospect.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a graph comparing the temperature distribution of an object before and after application of a composite infrared reflective coating;
FIG. 2 shows an SEM image of a composite infrared-reflective coating according to one embodiment of the invention;
FIG. 3 shows a plot of reflectance versus wavelength for a composite infrared-reflective coating in accordance with one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, one skilled in the art will appreciate that the following embodiments are exemplary and are intended to be illustrative of the invention, and should not be construed as limiting the invention. Unless otherwise indicated, specific techniques or conditions are not explicitly described in the following examples, and those skilled in the art may follow techniques or conditions commonly employed in the art or in accordance with the product specifications.
In one aspect of the invention, a method of making a composite infrared reflective coating is provided. The method comprises the following steps:
step 100: an organic solution is provided.
It will be understood by those skilled in the art that organic solutions include a solvent and a solute, and that an organic solution may be formed by weighing a mass of the solute and dissolving the solute in the solvent. According to some embodiments of the present invention, the solute of the organic solution may include at least one of PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene copolymer), PMMA (polymethyl methacrylate), polystyrene, and cellulose acetate, and the solvent of the organic solution may be acetone. Therefore, the solute materials can be quickly dissolved in the organic solvent acetone, the preparation time is favorably shortened, the acetone has a low boiling point, and can be removed subsequently without additionally providing energy, so that the production cost is not increased, and the resource is favorably saved; in addition, the solute material is a film forming substance and forms a main body structure of the finally prepared composite infrared reflection coating, the solute material is favorable for film forming of the coating, and the solute material has better corrosion resistance and is favorable for improving the overall performance of the composite infrared reflection coating. According to one embodiment of the present invention, the organic solution has a solute of PVDF-HFP and a solvent of acetone. According to another embodiment of the invention, the solute of the organic solution is PMMA and the solution is acetone.
According to some embodiments of the present invention, the solute may be 5% to 45% by mass, for example, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, etc., in the organic solution, thereby contributing to the overall performance of the composite infrared reflective coating.
In some embodiments, when the infrared reflective coating prepared subsequently forms a composite infrared reflective coating, a phase separation method may be adopted, and the inventors have found that if the mass fraction of the solute exceeds a given range, for example, is less than 5% or greater than 45%, the size of pores after phase separation is easily too large or too small, and thus the infrared reflectivity of the prepared composite infrared reflective coating is reduced, and the temperature reduction effect is relatively poor; further, if the proportion of the solvent is too high (i.e., the mass fraction of the solute is too low), the viscosity of the slurry is low, and the phenomenon of ink bleeding is likely to occur, whereas if the proportion of the solvent is too low (i.e., the mass fraction of the solute is too high), the viscosity of the slurry is low, and the film formation is difficult.
According to embodiments of the present invention, after the solute is added to the solvent, stirring may be performed to rapidly form a solution. According to some embodiments of the invention, the stirring can be carried out at 40-55 ℃ for 20-40 min. The stirring speed is not particularly limited, and those skilled in the art can set the stirring speed according to actual conditions, and can properly use a faster stirring speed to stir under the conditions allowed by experimental equipment.
Step 200: and dispersing the infrared reflection particles into the organic solution, and uniformly stirring to obtain the infrared reflection coating.
According to the embodiment of the invention, the infrared reflective particles may include at least one of barium titanate, hollow glass microspheres and mica sheets, that is, the infrared reflective particles may be barium titanate, hollow glass microspheres or mica sheets, or may be a mixture of two or three of them. Therefore, the infrared reflection particles have a good infrared reflection function and good corrosion resistance, and are beneficial to improving the overall performance of the composite infrared reflection coating.
According to some embodiments of the present invention, the infrared-reflective particles may have a particle size of 5nm to 50 μm, for example, may be 5nm, 10nm, 20nm, 30nm, 50nm, 100nm, 200nm, 300nm, 500nm, 800nm, 1 μm, 5 μm, 10 μm, 20 μm, 30 μm, 50 μm, and the like. Therefore, the infrared reflection particles have proper particle size, can be uniformly dispersed in the coating structure, and are favorable for further improving the performance of the composite infrared reflection coating.
According to the embodiment of the invention, based on the total volume of the infrared reflective particles and the organic solution (solute and solvent), the volume fraction of the infrared reflective particles may be 3% to 15%, for example, 3%, 5%, 8%, 10%, 12%, 15%, etc., so that the added infrared reflective particles can effectively improve the reflectivity of the finally obtained composite infrared reflective coating, and the volume fraction of the added infrared reflective particles in the above range can also ensure that the infrared reflective particles are uniformly dispersed in the organic solution, which is beneficial to uniformly distributing the infrared reflective particles in the composite infrared reflective coating. The inventors found that if the volume fraction of the infrared-reflective particles added is too high, it is liable to cause difficulty in uniformly dispersing the infrared-reflective particles in the organic solution; if the volume fraction of the infrared reflective particles is too small, the effect of improving the reflectivity of the composite infrared reflective coating is not obvious enough, and the expected effect is difficult to achieve.
It should be noted that the total volume of the infrared reflective particles and the organic solution is equivalent to the total volume of the first mixed liquid mentioned later.
According to some embodiments of the invention, the step of obtaining the infrared-reflective coating comprises:
step 201: dispersing the infrared reflection particles into the organic solution, and carrying out first stirring to obtain a first mixed solution.
Step 202: and dropwise adding deionized water into the first mixed solution, and carrying out second stirring to obtain the infrared reflection coating.
According to some embodiments of the invention, the temperature of the first agitation and the temperature of the second agitation are both 40 ℃ to 55 ℃. It is understood by those skilled in the art that the temperature of the first stirring and the temperature of the second stirring do not affect each other, that is, the temperature of the first stirring and the temperature of the second stirring may be each independently 40 ℃ to 55 ℃, for example, may be each independently 40 ℃, 45 ℃, 50 ℃, 55 ℃, and the like. Therefore, the infrared reflection particles can be uniformly dispersed in the organic solution by using relatively low experiment temperature, so that resources and experiment raw materials are saved (for example, volatilization of a solvent can be reduced by using low temperature), the performance of the composite infrared reflection coating is improved, and the cost is reduced. If the temperature is too high, the solvent volatilization speed is higher, so that raw material waste is easily caused; when the temperature is too low, the stirring time is prolonged obviously, which is not favorable for reducing the cost.
In addition, according to some embodiments of the present invention, in step 202, deionized water is added dropwise to the first mixed solution, and the quality of the deionized water may satisfy the following condition: the mass ratio of the solute to the deionized water is between 4/5 and 4/3. Therefore, when the composite infrared reflection coating is prepared by adopting a phase separation method in the subsequent process, the solute and the deionized water have a proper mass ratio, and a porous structure with uniform distribution can be formed after phase separation, so that the infrared reflectivity of the coating is improved. The inventor finds that if the mass ratio of the solute to the deionized water is too small, the number of macropores generated after phase separation is reduced, which is not beneficial to improving the infrared reflectivity of the coating; if the mass ratio of the solute to the deionized water is too large, the quantity of mesopores generated after phase separation is reduced, which is not beneficial to improving the infrared reflectivity of the coating, but the infrared reflectivity is still superior to that of metal coatings, acrylic resin coatings and the like in the prior art. As will be understood by those skilled in the art, macroporous refers to pores having a pore size greater than 50nm, whereas mesoporous refers to pores having a pore size between 2nm and 50 nm.
According to some embodiments of the present invention, the first stirring time may be 0.5 to 1.5 hours, for example, 0.5 hour, 0.8 hour, 1.0 hour, 1.2 hours, 1.5 hours, and the like, so that the infrared reflective particles can be uniformly dispersed in the organic solution in a relatively short time, which is beneficial to reducing the cost.
According to some embodiments of the present invention, the second stirring time may be 2 to 4 hours, for example, 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours, and the like, so that the deionized water and the first mixed solution can be uniformly mixed in a relatively short time.
In the present invention, the stirring rates of the first stirring and the second stirring are not particularly limited, and those skilled in the art can set the stirring rates according to actual conditions, and can properly use a faster stirring speed to stir under the conditions allowed by experimental equipment, so that the substances in the stirring container can be uniformly mixed in a relatively shorter stirring time.
Step 300: and coating the infrared reflection coating on the substrate to obtain the composite infrared reflection coating.
From this, can make in the infrared reflection granule homodisperse organic solution, the compound infrared reflection coating that obtains can effectively reflect the infrared light, and then can effectively reduce the temperature that has this compound infrared reflection coating's object of coating, prevents to cause harmful effects to the function and the life of object owing to the object temperature rise that the insolate leads to.
According to some embodiments of the invention, the step of obtaining a composite infrared reflective coating comprises:
step 301: and coating the infrared reflection coating on the substrate to obtain the coating layer.
The specific method for forming the coating layer, the specific thickness of the coating layer, and the like are not particularly limited in the present invention, and those skilled in the art can set the method according to the actual situation as long as a uniform coating layer can be formed on the substrate. According to some embodiments of the present invention, the infrared reflective coating applied on the substrate may be scraped to have a certain thickness by using a scraper, and thus, a coating layer having a uniform thickness may be formed on the substrate by using a simple operation. According to some embodiments of the present invention, the thickness of the coating layer is 20 μm to 500 μm, for example, 20 μm, 30 μm, 50 μm, 80 μm, 100 μm, 120 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm, 500 μm, etc., so that a relatively thin coating layer can be formed, which is beneficial for saving resources, and the coating layer in the above range can effectively reduce the temperature of the surface of the object.
Step 302: the solvent in the coating layer is removed, allowing phase separation of the solute and the deionized water.
According to some embodiments of the present invention, in step 302, the solvent in the coating layer may be removed by standing and air-drying the coating layer, and the solute and the deionized water may be subjected to phase separation, wherein the standing and air-drying time may be 8 to 12 hours, so that the solvent may be slowly volatilized, and the solute and the deionized water may be sufficiently subjected to phase separation.
Step 303: and removing the deionized water in the coating layer subjected to phase separation to obtain the composite infrared reflection coating.
Further, after standing and air-drying to remove the solute, the coating layer subjected to phase separation is placed in an oven at 40-55 ℃ to be dried for 8-12 hours, so that deionized water is slowly volatilized, and the coating with the porous structure is obtained.
According to the embodiment of the invention, in the process of phase separation of the solute and the deionized water, the solute material can form a porous structure, and the porous structure is favorable for improving the infrared reflection performance of the coating; the solute material can form a porous structure by using a simple preparation method, and the infrared reflection particles with the infrared reflection function are uniformly dispersed in the solute material with the porous structure, so that the composite infrared reflection coating with excellent performance is obtained.
In general, the invention can make at least one of PVDF-HFP, PMMA, polystyrene, cellulose acetate and other materials form a film layer by using a simple preparation method, and the materials form a porous structure by using a phase separation principle, wherein the porous structure is favorable for improving the performance of the composite infrared reflection coating; inorganic materials such as barium titanate with an infrared reflection function, hollow glass microspheres and mica sheets are added into the composite coating, and the inorganic materials are uniformly dispersed in the film layer with a porous structure, so that the reflectivity of the composite infrared reflection coating is further improved; the preparation method has the advantages of easy regulation and control of process parameters, simple equipment, contribution to reducing the cost and easy industrialization; the prepared composite infrared reflection coating has excellent infrared reflection function, good weather resistance and corrosion resistance, and wide application scenes without limitation.
In another aspect of the invention, a composite infrared reflective coating is provided that is prepared using the method described above. Therefore, the composite infrared reflection coating has all the characteristics and advantages of the preparation method, and the details are not repeated herein. In general, the composite infrared reflection coating has the advantages of simple preparation, low cost, excellent weather resistance and corrosion resistance, excellent infrared reflection performance and the like, can effectively reduce the temperature of an object, is not limited by the use scene, can be applied to the surfaces of building outer walls, roofs, automobiles and oil tanks, can also be applied to the surfaces of chemical fibers, wood, metal and the like, and has wide application prospect.
The technical solutions of the present invention are described below by specific examples, and it should be noted that the following examples are only illustrative and are not to be construed as limiting the scope of the present invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
First, 1g of PVDF-HFP (polyvinylidene fluoride-hexafluoropropylene copolymer) was weighed, added to 8g of acetone (acetone was put in a reagent bottle with a cap, sealed), and then stirred at 50 ℃ for 30min until PVDF-HFP was completely dissolved in acetone to form an organic solution. Further, based on the total volume of the organic solution and barium titanate, weighing barium titanate (infrared reflection particles) with the volume fraction of 5%, wherein the average particle size of the barium titanate is 50nm, adding the barium titanate into the organic solution, stirring the mixed solution for 1h at 50 ℃ to uniformly disperse the barium titanate in the organic solution, then dropwise adding 1g of deionized water into the uniformly dispersed mixed solution, and then continuously stirring for 3h at 50 ℃ until the mixture is uniformly mixed to obtain the infrared reflection coating. Finally, dropping the infrared reflection coating on a copper foil (taking the copper foil as a matrix), adjusting knobs of a scraper to 40um, scraping a coating layer with corresponding thickness by using the scraper, standing the coating layer at normal temperature for air drying for 10h, removing an organic solvent acetone, enabling deionized water and PVDF-HFP to be separated, then placing the coating layer in an oven at 50 ℃ for drying for 10h, and removing the deionized water to obtain the composite infrared reflection coating with the porous structure.
Example 2
Unlike example 1, in this example, the volume fraction of barium titanate was 2% based on the total volume of the organic solution and barium titanate.
Example 3
Unlike example 1, in this example, the volume fraction of barium titanate was 8% based on the total volume of the organic solution and barium titanate.
Example 4
Unlike example 1, in this example, the volume fraction of barium titanate was 10% based on the total volume of the organic solution and barium titanate.
Example 5
Unlike example 1, in this example, the volume fraction of barium titanate was 15% based on the total volume of the organic solution and barium titanate.
Example 6
Unlike example 1, in this example, the volume fraction of barium titanate was 18% based on the total volume of the organic solution and barium titanate.
Example 7
Unlike example 1, in this example, the infrared-reflective particles are hollow glass microspheres, and the volume fraction of the hollow glass microspheres is 5% based on the total volume of the organic solvent and the hollow glass microspheres.
Example 8
Unlike example 7, in this example, the volume fraction of the hollow glass microspheres was 10% based on the total volume of the organic solution and the hollow glass microspheres.
Example 9
Unlike example 1, in this example, the infrared-reflective particles are mica flakes, the volume fraction of which is 5%, based on the total volume of the organic solution and the mica flakes.
Example 10
Unlike example 9, in this example, the volume fraction of mica platelets was 10% based on the total volume of organic solution and mica platelets.
Comparative example 1
Untreated copper foil (copper foil substrate identical to that in example 1), i.e. no composite infrared reflective coating was applied.
TABLE 1 results of temperature test of examples and comparative examples
The sample obtained in the above example and the untreated copper foil (control experiment) were placed in an outdoor space at an ambient temperature of 35 ℃ and the temperature distribution of the copper foil coated with the composite infrared reflective coating and the copper foil not coated with the composite infrared reflective coating was measured. The temperature profile can be seen in fig. 1, wherein (a) is the temperature profile of the sample in example 1, and (B) is the temperature profile of the copper foil without the composite infrared reflective coating. As can be seen from fig. 1, the temperature of the sample in example 1 was 30.3 ℃, and the temperature of the copper foil without the composite infrared reflective coating was 35.3 ℃, it can be seen that the composite infrared reflective coating prepared by the method of the present invention can effectively lower the temperature of the object. In addition, the test results of samples in other embodiments of the invention can be seen in table 1, and as can be seen from table 1, the temperature of the samples in embodiments 3-5 and 7-10 is lower than 34 ℃, which is obviously lower than the temperature of the untreated copper foil in comparative example 1 by 35.3 ℃, so that the composite infrared reflective coating prepared by the method provided by the invention can effectively lower the temperature of an object; in the sample preparation process in the embodiment 2, the volume fraction of the added infrared reflection particles (barium titanate) is small, the infrared reflection particles do not improve the reflectivity of the finally prepared composite infrared reflection coating obviously enough, and compared with the comparative example 1, the temperature is only reduced by 0.8 ℃; in the sample preparation process in example 6, the volume fraction of the added infrared reflective particles is too high, and the infrared reflective particles are difficult to be uniformly dispersed in the organic solution, so that the infrared reflective effect of the finally obtained composite infrared reflective coating is not ideal enough, and compared with comparative example 1, the temperature is only reduced by 1.1 ℃. By comparison, the composite infrared reflection coating obtained by the preparation method of the composite infrared reflection coating provided by the invention can protect an object coated with the coating, and effectively reduce the risk of adverse effects on the service performance, the service life and the like of the object caused by temperature rise due to exposure and the like.
The sample (coating portion) of example 1 was tested by scanning electron microscopy and the corresponding SEM picture is shown in fig. 2. The microstructure of the formed coating can be observed to be a porous structure from fig. 2, the pores in the coating are rich and different in size, include macropores and mesopores, and are uniformly distributed, and the infrared reflection particles barium titanate are micro-nano-sized particles and are uniformly distributed in the porous coating structure.
The infrared reflectance of the sample (coating portion) in example 1 was measured, and the measurement results are shown in fig. 3. As can be seen from FIG. 3, in the near infrared band of 0.78-2.5 μm sunlight, the average reflectivity of the composite infrared reflective coating reaches over 90%, indicating that the cooling effect is better, which is also consistent with the temperature measurement result of FIG. 1.
In the description herein, references to the description of the term "one embodiment," "another embodiment," "some embodiments," "some specific embodiments," or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments. Furthermore, the various embodiments and features of the various embodiments described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention.
Claims (10)
1. A preparation method of a composite infrared reflection coating is characterized by comprising the following steps:
providing an organic solution;
dispersing infrared reflection particles into the organic solution, and uniformly stirring to obtain an infrared reflection coating;
and coating the infrared reflection coating on a substrate to obtain the composite infrared reflection coating.
2. The method of claim 1, wherein the infrared-reflective particles comprise at least one of barium titanate, hollow glass microspheres, and mica platelets.
3. The method according to claim 1 or 2, wherein the infrared-reflective particles have a particle size of 5nm to 50 μm.
4. The method of claim 1 or 2, wherein the organic solution has solutes comprising at least one of PVDF-HFP, PMMA, polystyrene, and cellulose acetate, and the organic solution has a solvent of acetone;
in the organic solution, the mass fraction of the solute is 5 to 45 percent.
5. The method of claim 4, wherein the step of obtaining the infrared-reflective coating comprises:
dispersing the infrared reflection particles into the organic solution, and carrying out first stirring to obtain a first mixed solution;
and dropwise adding deionized water into the first mixed solution, and carrying out second stirring to obtain the infrared reflection coating.
6. The method of claim 5, wherein the infrared-reflective particles are present in a volume fraction of 3% to 15% based on the total volume of the first mixed liquor.
7. The method of claim 5, wherein the mass ratio of the solute to the deionized water is 4/5-4/3.
8. The method of claim 5, wherein the step of obtaining the composite infrared reflective coating comprises:
coating the infrared reflection coating on the substrate to obtain a coating layer;
removing the solvent in the coating layer so that the solute and the deionized water are subjected to phase separation;
and removing the deionized water in the coating layer subjected to the phase separation to obtain the composite infrared reflection coating.
9. The method of claim 8 wherein the thickness of the coating layer is 20-500 μm.
10. A composite infrared reflective coating prepared by the method of any one of claims 1 to 9.
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