CN114316636A - Stray light eliminating-molecular adsorption-thermal control three-function coating and preparation method and application thereof - Google Patents
Stray light eliminating-molecular adsorption-thermal control three-function coating and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to the technical field of surface engineering, and discloses a stray light eliminating-molecular adsorption-thermal control three-functional coating as well as a preparation method and application thereof. The coating comprises carbon black, zeolite molecular sieve and aluminum dihydrogen phosphate. The invention provides a stray light eliminating-molecular adsorption-thermal control three-functional coating, which takes carbon black, a zeolite molecular sieve and aluminum dihydrogen phosphate as raw materials, wherein the highest solar absorption ratio of a coating formed by the coating is more than 0.98, the hemispherical emissivity can reach 0.89-0.92, and the saturated adsorption capacity can reach 50-95 mg/g; meanwhile, with the continuous increase of the absorption amount of the molecular pollutants, the solar absorption ratio is only slightly reduced, and the hemispherical emissivity is basically unchanged. In addition, the preparation method of the coating is simple and feasible, and is easy for industrial preparation.
Description
Technical Field
The application relates to the technical field of surface engineering, in particular to a stray light eliminating-molecular adsorption-thermal control three-functional coating and a preparation method and application thereof.
Background
In aerospace applications, molecular contaminants released by organic materials in a vacuum environment pose a significant threat to the efficiency and lifetime of spacecraft precision electronic and optical instruments. Meanwhile, some aerospace products, such as cameras, telescopes, laser systems and the like, need high absorption characteristics and control of stray light characteristics in a near infrared range, the stray light is a cause of contrast and image quality degradation and optical system noise increase, and the aerospace products are more sensitive to molecular pollutants and more need to reduce the influence of the molecular pollutants.
Patent CN202011357112.4 discloses an organic black molecular absorption coating, the coating in the specific embodiment of the coating is made of carbon black, 13X type zeolite molecular sieve and cyanate ester resin, the molecular adsorption effect is poor, the saturated adsorption capacity of molecular pollutants of the coating is only 17.58mg/g, and the organic resin contained in the organic coating can generate molecular pollutants in the vacuum environment of the space, further affecting the overall adsorption effect of the coating. Meanwhile, with the continuous adsorption of the coating to molecular pollutants, the performance of the organic black molecular absorption coating for eliminating impurity and light scattering is influenced. In addition, the coating slurry disclosed by the patent is complex in preparation process, carbon black and a zeolite molecular sieve need to be pretreated, an atomic layer periodic precipitation growth process and an accelerant, a coupling agent and ultra-black powder need to be added subsequently, and the coating slurry has no advantages in time consumption and cost.
Patent US2018051177A1 discloses an inorganic black molecule absorption coating, wherein fillers used in the coating in the specific implementation mode are 13X zeolite and bone charcoal, a binder is AS-30 silica sol, and the binder forms a three-dimensional reticular coating structure, so that the binding force of the coating is general, the adsorption capacity of the coating cannot be improved by using a higher filler proportion, otherwise, the coating is pulverized and poor in film-forming property, meanwhile, the coating is sprayed on the surface of an epoxy coating, the thickness of the coating can only be 60-70 mu m, the molecular adsorption capacity of the coating is further reduced by using a lower thickness, and the molecular adsorption capacity is only 0.6mg/cm2. The need to build a multilayer structure with a primer layer also has no time-consuming and cost-advantageous properties.
Therefore, how to develop a black molecular adsorption coating slurry with simple process, the coating does not generate molecular pollutants to provide higher adsorption capacity, and simultaneously reduces the influence of the molecular pollutant absorption amount of the coating on the stray light elimination performance, and the coating does not need to be additionally constructed, thereby avoiding the use of a thermal control coating with a multilayer film structure and improving the time cost advantage.
Disclosure of Invention
In view of the above, the present invention aims to provide a stray light elimination-molecular adsorption-thermal control three-function coating and a preparation process thereof, so that a coating sprayed by the coating has three functions of eliminating stray light, adsorbing molecular pollutants and thermal control, and has high molecular pollutant adsorption performance, and the influence of molecular pollutant adsorption on stray light elimination performance and thermal control performance is reduced.
It is another object of the present invention to provide the use of the above-described coating for the preparation of parts for instruments for aerospace applications, and for the preparation of substrates with some or all of the requirements for eliminating stray light, adsorbing molecular contaminants, and thermal management properties.
To solve the above technical problems/achieve the above object or to at least partially solve the above technical problems/achieve the above object, the present invention provides a three-functional paint including carbon black, zeolite molecular sieve and aluminum dihydrogen phosphate.
The invention provides a three-functional inorganic coating with functions of eliminating stray light, molecular adsorption and thermal control, which combines carbon black/beta molecular sieve and inorganic adhesive, aiming at solving the problems that molecular pollutants generated by material outgassing of systems such as optics, electronics, laser and the like of a spacecraft are deposited on instrument parts to reduce the performance and service life of high-sensitivity surfaces and stray light, wherein the three coatings are mutually matched to realize multiple functions and have more excellent effects on molecular absorption and stray light elimination.
Preferably, the zeolite molecular sieve is a ZSM-5 molecular sieve, a NaY molecular sieve or a beta molecular sieve; in the specific embodiment of the present invention, beta molecular sieves are most preferred.
Preferably, the mass ratio of the carbon black to the beta molecular sieve to the aluminum dihydrogen phosphate in the coating is 0.5: (0.5-2.5): 1.5, more preferably 0.5: (0.5-1.5): 1.5; in a specific embodiment of the present invention, the mass ratio of the carbon black, the zeolite molecular sieve and the aluminum dihydrogen phosphate is 0.5: 0.5:1.5, 0.5:1:1.5, 0.5:1.5:1.5 or 0.5:2: 1.5.
In a specific embodiment of the invention, the aluminum dihydrogen phosphate is a commercially available preparation, and the solid content of the aluminum dihydrogen phosphate is 30-50%, and preferably 40%.
Preferably, the particle size of the carbon black is 10-30 nm; the particle size of the beta molecular sieve is 1-2 mu m.
The coating prepared from the coating of the invention has the solar absorption ratio (alpha)s) The highest hemispherical emissivity (epsilon H) can reach more than 0.98, the hemispherical emissivity (epsilon H) can reach 0.89-0.92, the saturated adsorption capacity can reach 50-95mg/g, and the coating can be used as a functional coating with high absorptivity and high adsorptivity. Meanwhile, the coating which does not adsorb molecular pollutants has alphas of 0.988 and epsilon H of 0.92; the alpha s and the epsilon H of the coating with the molecular pollutant adsorption quantity of 30mg/g are respectively 0.96 and 0.92; the coating with 70mg/g of adsorbed molecular contaminant had α s of 0.95 and ∈ H of 0.91. The solar absorptivity is only slightly reduced, and the hemispherical emissivity is basically unchanged.
Based on the excellent technical effects, the invention provides the application of the coating in preparing an aerospace instrument or a part thereof and/or a substrate with one or more than two of the properties of eliminating stray light, adsorbing molecular pollutants and controlling heat.
Wherein the aerospace instrument comprises one or more of an optical instrument, an electronic instrument and a laser instrument. The substrate may be any common spacecraft material, preferably the substrate comprises one or more of Al, Cu, Mg, Si, stainless steel and SiC based composite materials, such as aluminum sheet, magnesium sheet, tantalum sheet, high silicon aluminum alloy sheet and the like.
According to the application, the invention provides a base material, and a coating formed by the coating of the invention is cured on the surface of the base material. The coating thickness is adjusted according to requirements, preferably 60 to 210 μm, and in the embodiment of the present invention, 150 μm.
In the preparation process of the base material, the surface of the base material is roughened, for example, by sand blasting, and then the coating of the present invention is sprayed and dried. Preferably, the coating can be prepared by N spraying, more preferably, N.gtoreq.7. Preferably, the thickness of a single spraying is not more than 20 mu m, the time interval between two adjacent spraying is not less than 20min, and the spraying atmosphere is air. The drying treatment is drying in the shade at room temperature, and then baking for 8h at 90 ℃.
In the preparation process of the coating, carbon black and aluminum dihydrogen phosphate are subjected to ball milling, and then zeolite molecular sieves are added and uniformly mixed to obtain the coating. During the ball milling and mixing process, a proper amount of solvent is added as required to assist the ball milling and mixing operation, water is generally used as the solvent, the prepared coating contains the solvent, and the coating does not contain the solvent after being sprayed and dried.
Preferably, the ball milling is finished on a ball mill by adopting special tools, and the parameters of the ball mill are set conventionally; in the specific embodiment of the invention, the rotation speed of the ball mill is 60r/min, the ball milling time is 1h, the diameter of the ball milling ceramic beads is 5mm, and the ball-material ratio is approximately equal to 3: 1.
Preferably, the uniform mixing is realized in a stirring way, and the stirring process is finished in a stirrer; in the specific embodiment of the invention, the rotation speed during stirring is 500r/min, and the stirring time is 4 h.
Preferably, the solid-liquid ratio of the coating is 0.4-0.7, wherein the solid refers to carbon black, zeolite molecular sieve and aluminum dihydrogen phosphate, and the liquid refers to a solvent such as water.
According to the technical scheme, the invention provides the three-functional paint with the functions of stray light elimination, molecular adsorption and thermal control, wherein carbon black, a zeolite molecular sieve and aluminum dihydrogen phosphate are used as raw materials, the solar absorptivity of a coating formed by the paint can reach over 0.98 at most, the hemispherical emissivity can reach 0.89-0.92, and the saturated adsorption capacity can reach 50-95 mg/g; meanwhile, with the continuous increase of the absorption amount of the molecular pollutants, the solar absorptivity is only slightly reduced, and the hemispherical emissivity is basically unchanged. In addition, the preparation method of the coating is simple and feasible, and is easy for industrial preparation.
Drawings
FIG. 1 shows the results of the parasitic light removal performance and the thermal control performance for different coatings and thicknesses;
FIG. 2 is a schematic view of a molecular contaminant adsorption capacity test;
FIG. 3 shows a comparison of the adsorption amounts of molecular contaminants for different example coatings;
FIG. 4 shows a comparison of the appearance of different molecular contaminants at different adsorption levels;
FIG. 5 shows the results of the change of the stray light eliminating performance and the thermal control performance of the coating under different molecular pollutant adsorption amounts.
Detailed Description
The invention discloses a stray light eliminating-molecular adsorption-thermal control three-functional coating, and a preparation method and application thereof. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the products, processes and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations and modifications, or appropriate alterations and combinations, of the products, processes and applications described herein may be made and used without departing from the spirit, scope and ambit of the invention. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that, in this document, relational terms such as "first" and "second", "step 1" and "step 2", and "(1)" and "(2)" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The invention overcomes the defects of the prior art and provides three-functional inorganic coating material of stray light elimination, molecular adsorption and thermal control, a preparation method and related application thereof. The coating is prepared by firstly preparing black slurry by a ball milling and stirring method, and then adding zeolite molecular sieve into the black slurry to prepare the inorganic coating with three functions of stray light elimination, molecular adsorption and thermal control. The preparation method and the spraying method specifically comprise the following steps:
(1) adding carbon black into a ball-milling ceramic tank, adding aluminum dihydrogen phosphate, adding a proper amount of deionized water for dilution, adding a certain amount of ball-milling beads, and obtaining black slurry by adopting a ball-milling mode.
(2) And transferring the black slurry to a beaker, adding a certain amount of zeolite molecular sieve, adding a proper amount of deionized water, and uniformly stirring to obtain the coating.
(3) And carrying out sand blasting treatment on the substrate.
(4) And spraying the coating on the substrate after sand blasting.
(5) And drying the sprayed coating to obtain the three-functional inorganic coating with the functions of stray light elimination, molecular adsorption and thermal control.
In the step (1), the mass fraction of the aluminum dihydrogen phosphate is 40%.
In the step (1), ball milling is completed on a ball mill by adopting special tools, the rotating speed is 60r/min, the ball milling time is 1h, and the diameter of ball-milled ceramic beads is 5 mm.
In the step (2), the stirring process is completed in a stirrer, the rotating speed is 500r/min, and the stirring time is 4 h.
In the step (4), the coating is prepared by spraying for N times. The thickness of single spraying is not more than 20 mu m, the time interval of two adjacent spraying is not less than 20min, and the spraying atmosphere is air.
In the step (5), the drying treatment is drying in the shade at room temperature, and then baking for 8 hours at 90 ℃.
Detailed description of the inventionThe experimental raw materials used in the method are all commercially available and the same molecular sieve is obtained from the same source. Wherein, the carbon black has an average particle size of 23 nm; aluminum dihydrogen phosphate, solid content 40%; inorganic silica sol, SiO2The mass fraction concentration of the nano-particles is 40 percent, and the average particle size is 20 nm-24 nm; beta molecular sieve with average particle size less than 2 μm; ZSM-5 molecular sieve, the average grain diameter is less than 6 μm; NaY molecular sieve with average grain size smaller than 5 micron; the beta molecular sieve, the ZSM-5 molecular sieve and the NaY molecular sieve are all one of zeolite molecular sieves, and the unique pore channel structures of the zeolite molecular sieves have physical adsorption performance.
In the examples and comparative experiments provided by the present invention, unless otherwise specified, other experimental conditions, materials, etc. were kept consistent for comparability, except for the differences indicated in the groups.
In the specific embodiment of the invention, different coatings are prepared according to the components in the table 1, and the performance data of each group of coatings are detected and summarized to the table 1;
TABLE 1
The invention provides a three-functional inorganic coating with functions of stray light elimination, molecular adsorption and thermal control, and a preparation method and application thereof.
Example 1: coating prepared by ZSM-5 zeolite molecular sieve and coating sprayed on substrate
(1) Adding 6g of carbon black into a ball-milling ceramic tank, adding 45g of aluminum dihydrogen phosphate (with the solid content of 40%), adding 30g of deionized water for dilution, adding 300g of ball-milling beads, and performing ball milling to obtain black slurry.
(2) And transferring the black slurry to a beaker, adding 18g of ZSM-5 zeolite molecular sieve, adding 15g of deionized water, and uniformly stirring to obtain the coating.
(3) The aluminum substrate is subjected to sand blasting.
(4) And spraying molecular absorption coating on the substrate after sand blasting.
(5) And drying the sprayed coating to obtain a ZSM-5 stray light eliminating-molecular adsorption-thermal control three-function inorganic coating (ZSM-5coating0.5:1.5:1.5, wherein the mass ratio of the carbon black to the molecular sieve to the aluminum dihydrogen phosphate is calculated according to the solid content).
The specific technical indexes of the ZSM-5 stray light eliminating-molecular adsorption-thermal control three-function inorganic coating (ZSM-5coating0.5:1.5:1.5) prepared by the embodiment are as follows: when the thickness is 150 mu m, the solar absorption ratio of the coating is 0.971, and the hemispherical emissivity is 0.897; the saturated adsorption capacity of the molecular pollutants of the coating is 60mg/g,
example 2: coating prepared from beta zeolite molecular sieve and sprayed substrate coating
(1) Adding 9g of carbon black into a ball-milling ceramic tank, adding 67.5g of aluminum dihydrogen phosphate (with the solid content of 40%), adding 50g of deionized water for dilution, adding 450g of ball-milling beads, and performing ball milling to obtain black slurry.
(2) And transferring the black slurry to a beaker, adding 36g of beta molecular sieve, adding 20g of deionized water, and uniformly stirring to obtain the coating.
(3) The aluminum substrate is subjected to sand blasting.
(4) And spraying the coating on the substrate after sand blasting.
(5) And drying the sprayed coating to obtain a beta-coating with three functions of eliminating stray light, molecular adsorption and thermal control (the beta-coating ratio is 0.5:2:1.5, and the mass ratio of carbon black to molecular sieve to aluminum dihydrogen phosphate (in terms of solid content)).
The specific technical indexes of the beta-stray light elimination-molecular adsorption-thermal control three-function inorganic coating (beta-coating0.5:2:1.5) prepared by the embodiment are as follows: when the thickness is 150 mu m, the solar absorption ratio of the coating is 0.964, and the hemispherical emissivity is 0.913; the saturated adsorption capacity of the molecular pollutants of the coating is 95 mg/g.
Example 3: coating prepared from NaY zeolite molecular sieve and coating of sprayed base material
(1) Adding 6g of carbon black into a ball-milling ceramic tank, adding 45g of aluminum dihydrogen phosphate (with the solid content of 40%), adding 30g of deionized water for dilution, adding 300g of ball-milling beads, and performing ball milling to obtain black slurry.
(2) And transferring the black slurry to a beaker, adding 18g of NaY zeolite molecular sieve, adding 15g of deionized water, and uniformly stirring to obtain the molecular absorption coating.
(3) The aluminum substrate is subjected to sand blasting.
(4) And spraying molecular absorption coating on the substrate after sand blasting.
(5) And drying the sprayed black slurry to obtain NaY impurity eliminating light-molecular adsorption-thermal control three-function inorganic coatings (NaYcoating0.5:1.5:1.5, the mass ratio of carbon black to molecular sieve to aluminum dihydrogen phosphate (in terms of solid content)) with different thicknesses.
The specific technical indexes of the NaY stray light elimination-molecular adsorption-thermal control three-function inorganic coating (NaYcoating0.5:1.5:1.5) prepared by the embodiment are as follows: when the thickness is 150 mu m, the solar absorption ratio of the coating is 0.978, and the hemispherical emissivity is 0.916; the saturated adsorption capacity of the molecular pollutants of the coating is 50 mg/g.
Example 4: coating prepared from beta zeolite molecular sieve and sprayed substrate coating
(1) Adding 6g of carbon black into a ball-milling ceramic tank, adding 45g of aluminum dihydrogen phosphate (with the solid content of 40%), adding 30g of deionized water for dilution, adding 300g of ball-milling beads, and performing ball milling to obtain black slurry.
(2) And transferring the black slurry to a beaker, adding 18g of beta zeolite molecular sieve, adding 15g of deionized water, and uniformly stirring to obtain the molecular absorption coating.
(3) The aluminum substrate is subjected to sand blasting.
(4) And spraying molecular absorption coating on the substrate after sand blasting.
(5) And drying the sprayed black slurry to obtain the beta-coating three-function inorganic coating with different thicknesses (beta-coating0.5:1.5:1.5, the mass ratio of carbon black to molecular sieve to aluminum dihydrogen phosphate (in terms of solid content)).
The specific technical indexes of the beta-stray light elimination-molecular adsorption-thermal control three-function inorganic coating (beta-coating0.5:1.5:1.5) prepared by the embodiment are as follows: when the thickness is 150 mu m, the solar absorption ratio of the coating is 0.988, the hemispherical emissivity is 0.92, and the saturated adsorption capacity of molecular pollutants of the coating is 70 mg/g.
Comparative example 1: coating prepared from beta zeolite molecular sieve and sprayed substrate coating
(1) 6g of carbon black are placed in a ball-milling ceramic pot, and 45g of inorganic silica Sol (SiO) are added2Content note), 30g of deionized water is added for dilution, 300g of ball milling beads are added, and a black slurry is obtained by adopting a ball milling mode.
(2) And transferring the black slurry to a beaker, adding 18g of beta zeolite molecular sieve, adding 15g of deionized water, and uniformly stirring to obtain the molecular absorption coating.
(3) The aluminum substrate is subjected to sand blasting.
(4) And spraying molecular absorption coating on the substrate after sand blasting.
(5) Drying the sprayed black slurry to obtain a beta-eliminating stray light-molecular adsorption-thermal control three-function inorganic coating (beta-Si-coating0.5:1.5:1.5) with different thicknesses, wherein the ratio of the carbon black to the molecular sieve to the inorganic silica sol is SiO2Meter) mass ratio).
The specific technical indexes of the beta-stray light elimination-molecular adsorption-thermal control three-function inorganic coating (beta-Si-coating0.5:1.5:1.5) prepared by the embodiment are as follows: when the thickness is 150 μm, the coating layer is too loose and does not have a film-forming state. The reason is that the inorganic silica sol forms a network structure to wrap, so that when the pigment ratio is high, the filler cannot be wrapped, and the coating is difficult to form a film.
Comparative example 2: coating prepared from beta zeolite molecular sieve and sprayed substrate coating
(1) 6g of carbon black are placed in a ball-milling ceramic pot, and 45g of inorganic silica Sol (SiO) are added2Metering), adding 30g of deionized water for dilution, adding 300g of ball-milling beads, and performing ball milling to obtain black slurry.
(2) And transferring the black slurry to a beaker, adding 12g of beta zeolite molecular sieve, adding 15g of deionized water, and uniformly stirring to obtain the molecular absorption coating.
(3) The aluminum substrate is subjected to sand blasting.
(4) And spraying molecular absorption coating on the substrate after sand blasting.
(5) Drying the sprayed black slurryDrying to obtain beta-eliminating stray light-molecular adsorption-thermal control three-function inorganic coating (beta-Si-coating0.5: 1:1.5) with different thicknesses, wherein the ratio of the carbon black to the molecular sieve to the inorganic silica sol is SiO2Meter) mass ratio).
The specific technical indexes of the beta-stray light elimination-molecular adsorption-thermal control three-function inorganic coating (beta-Si-coating0.5: 1:1.5) prepared by the embodiment are as follows: at a thickness of 150 μm, the initial solar absorptance of the coating was 0.97 and the hemispherical emissivity was 0.92. When the molecular pollutant of the coating reaches the saturated adsorption capacity of 50mg/g, the solar absorption ratio of the coating is reduced to 0.945, and the hemispherical emissivity is reduced to 0.89. After the pigment ratio of the coating is reduced, the coating can be formed into a film, but all technical indexes are reduced compared with example 4.
Comparative example 3: coating prepared from beta zeolite molecular sieve and sprayed substrate coating
The coating was prepared by replacing aluminum dihydrogen phosphate with cyanate ester resin of CN202011357112.4 according to the method of example 4, and all the drugs were commercially available. Wherein, the purity of the cyanate ester is more than or equal to 98.0 percent; aluminum acetylacetonate with a purity of 98%. Meanwhile, in view of experimental differences between the organic coating and the inorganic coating due to the binder material, the preparation steps are slightly adjusted:
(1) adding 18g of cyanate ester resin into a beaker A filled with 57g of acetone, adding 6g of carbon black, adding 1g of aluminum acetylacetonate and 1g of KH560 silane coupling agent, adding 300g of 1mm glass beads, and stirring at 1700r/min for 3h by adopting a sand grinding mode to obtain black slurry.
(2) And filtering the black slurry into a beaker B by adopting a 120-mesh copper net, continuously adding 18g of beta zeolite molecular sieve into the beaker B, adding 15g of acetone, and stirring at 1700r/min for 2h to obtain the molecular absorption coating.
(3) The aluminum substrate is subjected to sand blasting.
(4) And spraying molecular absorption coating on the substrate after sand blasting.
(5) And drying the sprayed black slurry to obtain the beta-O-coating0.5:1.5:1.5 (mass ratio of carbon black, molecular sieve and cyanate) organic coating with three functions of eliminating stray light, molecular adsorption and thermal control in different thicknesses.
The specific technical indexes of the prepared beta-stray light elimination-molecular adsorption-thermal control three-function organic coating (beta-O-coating0.5:1.5:1.5) are as follows: when the thickness is 150 mu m and the molecular pollutants are not adsorbed, the solar absorption ratio of the coating is 0.96, the hemispherical emissivity is 0.92, and the saturated adsorption quantity of the molecular pollutants of the coating is 30 mg/g.
Example 5: detection of stray light eliminating performance (alpha s influence) and thermal control performance (epsilon H influence) of different coatings and thicknesses
As shown in fig. 1, it can be seen that the coatings all have the stray light eliminating property and the thermal control property when different molecular sieves are used, but the coatings are optimally performed by the beta zeolite molecular sieve. In the same coating, the solar absorptivity of the coating is obviously reduced and the emissivity is not obviously changed with the increase of the proportion of the zeolite molecular sieve, see beta-coating0.5:1.5:1.5 and beta-coating0.5:2: 1.5; as the thickness of the coating increases, the solar absorptance of the coating tends to increase, but the emissivity does not change substantially.
Example 6: comparison of molecular contaminant adsorption amounts of coatings of different examples
1. Molecular adsorption Capacity test
According to the test schematic diagram of FIG. 2, the vacuum molecular pollutant adsorption performance of the coating (coating thickness-150 μm) is tested and analyzed by using silicon rubber as a pollution source. The specific test method is as follows: carrying out vacuum treatment on the coating sample at 125 ℃ for 3h, and weighing; weighing pollutants (silicon rubber-500 mg), carrying out vacuum pollution treatment on different samples for 20h, carrying out vacuum heat treatment on the polluted samples for 20h, weighing again to obtain the final weight increase of the coating sample, and calculating the adsorption quantity Q of the molecular pollutants.
2. Saturated adsorption capacity of molecular contaminants
The result is shown in fig. 3, and the molecular adsorption performance of the coating adopting the beta molecular sieve is obviously superior to that of the ZSM molecular sieve and the NaY molecular sieve under the same mixture ratio. When the beta molecular sieve is adopted to prepare the coating, when the occupation ratio of the beta molecular sieve is increased from 1.5 to 2, the content of the molecular sieve is increased, so that the adsorption quantity of molecular pollutants of the coating is increased from 70mg/g to 95mg/g, but the heat radiation performance in the figure 1 shows that the solar absorptivity is obviously reduced, and the beta-coating0.5:1.5:1.5 is an optimal formula in consideration of the balance of the performance.
Example 7: appearance and performance variation for different molecular contaminant adsorption amounts
The appearance of the coating after adsorbing different amounts of molecular pollutants with the beta-coating0.5:1.5:1.5 coating (coating thickness-150 μm) of example 4 shows no obvious color change on the polluted surface, and the heat radiation performance of the coating is mainly influenced, as shown in FIG. 5, the thermal property of the beta-coating0.5:1.5:1.5 coating (coating thickness-150 μm) is slightly changed after adsorbing different amounts of pollutants. Beta-coating0.5:1.5:1.5 without adsorbing molecular contaminants (Q ═ 0) coating α s ═ 0.988, and ∈ H ═ 0.92. The adsorption quantity of the molecular pollutants is 30mg/g (Q is equal to 30mg/g), the alpha s of the beta-coating is 0.5:1.5:1.5 coating is equal to 0.96, and the epsilon H is equal to 0.92. The adsorption capacity of the molecular pollutants is 70mg/g (Q is 70 mg/g). alpha.s of beta-coating0.5:1.5:1.5 coating is 0.95, and epsilon H is 0.91.
The coating of comparative example 3 had a saturated adsorption of molecular contaminants of 30mg/g, where the solar absorptance of the coating dropped from 0.96 when not adsorbed to 0.93 and the hemispherical emissivity dropped from 0.92 to 0.90.
Meanwhile, the ZSM-5 decolouring-molecular adsorption-thermal control three-function inorganic coating (ZSM-5coating0.5:1.5:1.5) of the embodiment 1 has the following specific technical indexes: the solar absorptivity of the coating is reduced from 0.971 to 0.925 and the hemispherical emissivity is reduced from 0.897 to 0.87 from the unadsorbed molecular pollutants to the saturated adsorption capacity at the thickness of 150 mu m; the specific technical indexes of the NaY stray light elimination-molecular adsorption-thermal control three-function inorganic coating (NaYcoating0.5:1.5:1.5) of the embodiment 3 are as follows: at a thickness of 150 μm, from no adsorbed molecular contaminants to a saturated adsorption capacity, the solar absorptance of the coating drops from 0.978 to 0.93, and the hemispherical emissivity drops from 0.916 to 0.90.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The three-functional paint is characterized by comprising carbon black, a zeolite molecular sieve and aluminum dihydrogen phosphate.
2. The coating of claim 1, wherein the zeolite molecular sieve is a ZSM-5 molecular sieve, NaY molecular sieve or beta molecular sieve.
3. The coating as claimed in claim 1, wherein the mass ratio of the carbon black, the zeolite molecular sieve and the aluminum dihydrogen phosphate is 0.5 (0.5-2) to 1.5.
4. Use of a coating according to any one of claims 1 to 3 in the manufacture of an aerospace instrument or part thereof, and/or in the manufacture of a substrate where one or more of stray light elimination, molecular contamination adsorption and thermal control is desired.
5. The use according to claim 4, wherein the aerospace instrument comprises one or more of an optical instrument, an electronic instrument, and a laser instrument.
6. Use according to claim 4, wherein the substrate is a spacecraft material.
7. The use according to claim 4 or 6, wherein the substrate comprises one or more of Al, Cu, Mg, Si, stainless steel and SiC-based composite material.
8. A substrate having a surface cured with a coating layer formed from the coating material according to any one of claims 1 to 3.
9. A method for producing a substrate according to claim 8, wherein the surface of the substrate is roughened, and the coating according to any one of claims 1 to 3 is sprayed and then dried.
10. The method for preparing the coating of claim 1, wherein the carbon black and the aluminum dihydrogen phosphate are ball-milled, and then the zeolite molecular sieve is added and mixed uniformly to obtain the coating.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115521641A (en) * | 2022-10-08 | 2022-12-27 | 北京星驰恒动科技发展有限公司 | Stray light eliminating coating and preparation method thereof |
| CN116589920A (en) * | 2023-04-23 | 2023-08-15 | 哈尔滨工业大学 | Organic-inorganic hybrid black molecule adsorption coating with strong binding force and preparation method thereof |
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| CN106380901A (en) * | 2016-09-20 | 2017-02-08 | 苏州直角新材料有限公司 | Fast-to-dry solar energy absorbent and preparation method thereof |
| CN112675822A (en) * | 2020-11-26 | 2021-04-20 | 哈尔滨工业大学 | Preparation method of high-absorption high-emissivity ultra-black molecular adsorption coating |
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| CN106380901A (en) * | 2016-09-20 | 2017-02-08 | 苏州直角新材料有限公司 | Fast-to-dry solar energy absorbent and preparation method thereof |
| CN112675822A (en) * | 2020-11-26 | 2021-04-20 | 哈尔滨工业大学 | Preparation method of high-absorption high-emissivity ultra-black molecular adsorption coating |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115521641A (en) * | 2022-10-08 | 2022-12-27 | 北京星驰恒动科技发展有限公司 | Stray light eliminating coating and preparation method thereof |
| CN116589920A (en) * | 2023-04-23 | 2023-08-15 | 哈尔滨工业大学 | Organic-inorganic hybrid black molecule adsorption coating with strong binding force and preparation method thereof |
| CN116589920B (en) * | 2023-04-23 | 2024-03-08 | 哈尔滨工业大学 | Organic-inorganic hybrid black molecule adsorption coating with strong binding force and preparation method thereof |
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