Extinction coating capable of resisting high-temperature extreme environment as well as preparation method and application of extinction coating

Abstract

The invention discloses a matting coating resistant to high-temperature extreme environments and a preparation method and application thereof, and belongs to the technical field of functional coatings, the method comprises the following steps: (1) mixing an organic solvent and a silane coupling agent, adding a catalyst, reacting, washing and drying to obtain POSS (Polyhedral Oligomeric Silsesquioxane); (2) reacting POSS, a diamine monomer and a dianhydride monomer in an organic solvent in a nitrogen atmosphere to obtain a PAA / POSS solution; and (3) adding light absorbing agent particles and mechanical reinforced phase particles into the PAA / POSS solution, uniformly mixing to obtain precursor slurry, imidizing the precursor slurry by adopting a plasma spraying method, and spraying and curing the precursor slurry to the surface of the pretreated base material to obtain the extinction coating capable of resisting the high-temperature extreme environment. The method is simple, efficient and suitable for various base materials, and the prepared coating has the advantages of high light absorption efficiency, high temperature resistance, friction resistance, atomic oxygen resistance, ultraviolet resistance, proton resistance, electron resistance and other space irradiation resistance.

Description

Technical Field

[0001] This invention belongs to the field of functional coating technology, specifically relating to a matte coating resistant to high temperature extreme environments, its preparation method, and its application. Background Art

[0002] Polyimide (PI), a high-performance engineering thermoplastic polymer, is now used in space environments. The characteristic structure of polyimide, including its imide and aromatic rings, endows it with excellent properties such as high strength and modulus, high temperature and corrosion resistance, high insulation, and high dielectric properties. Compared to thermoplastic polyimides, thermosetting polyimide materials undergo further cross-linking during curing, resulting in superior heat and chemical corrosion resistance, as well as higher strength and stiffness, making them more suitable for most extreme environments and widely used in the aerospace field. Current research focuses heavily on the structural and component modification of polyimides to improve their performance in space environments.

[0003] Star sensors use stars in deep space as a reference for detecting dark targets and are the most accurate sensors for satellite attitude measurement to date. Because star sensors operate in Earth or interstellar orbits, they are inevitably affected by various stray light sources, leading to increased stray grayscale and uneven illumination distribution on the image plane, thus affecting the signal-to-noise ratio and accurate star map identification. By coating the inside of the star sensor's sunshade with a high absorptivity extinction coating, external sunlight is shielded from entering the lens, while sunlight reflected from the Earth, Moon, and the satellite's surface and components is blocked, thereby eliminating stray light.

[0004] Low Earth orbit is currently the most active and harshest environment for spacecraft. Spacecraft carrying matting coatings must withstand the extreme and complex space environment during their orbital period, including charged particle radiation, atomic oxygen, vacuum ultraviolet light, ultra-high vacuum, and extreme temperature cycles. During special service phases, the matting coatings will experience severe conditions such as instantaneous high-temperature shocks and friction from soft materials, which places higher demands on the reliability of the materials carried. Therefore, the extremely harsh service environment poses a serious challenge to the aerospace engineering application of matting coatings.

[0005] Chinese patent document CN103691643A discloses a method for spraying a thermal control coating on the inner honeycomb structure surface of a spacecraft sunshade. This invention focuses on the problem that the uniformity of the matte thermal control coating spraying affects the imaging quality of the spacecraft. By improving the spraying process, a matte thermal control coating with a smooth appearance, uniform thickness, and good adhesion is obtained, meeting the requirements of thermal control coatings for spacecraft sunshades and improving the reliability of spacecraft in orbit. Chinese patent document CN104726844A discloses a method for growing a super-strong light-absorbing carbon nanotube coating on a titanium alloy substrate. This invention employs a surface micro-nanoization growth process and an additional plating transition layer (aluminum-nickel bimetallic intermediate buffer layer), which enhances the firmness and serialization of carbon nanotubes grown on the metal substrate (titanium alloy). This overcomes the problems of instability and disordered growth direction that may occur when growing carbon nanotubes on a metal substrate, thus allowing the carbon nanotube coating to firmly adhere to the titanium alloy surface and achieve super-strong light radiation absorption. However, none of the above inventions address the reliability of matte coatings in extreme temperature, thermal cycling, and ultra-high vacuum space environments. Summary of the Invention

[0006] This invention provides a method for preparing a matte coating resistant to high temperature and extreme environments. The method is simple and efficient, applicable to various substrates such as metals, polymers, and carbon fiber materials. The microstructure of the prepared coating is adjustable, exhibiting high light absorption efficiency, high temperature resistance, abrasion resistance, and resistance to space radiation such as atomic oxygen, ultraviolet light, protons, and electrons. It has good application prospects in fields such as stray light shielding of optical components.

[0007] The specific technical solution adopted is as follows:

[0008] A method for preparing a matte coating resistant to high-temperature extreme environments, comprising:

[0009] (1) Mix organic solvent and silane coupling agent, add catalyst and stir reaction, wash and dry to obtain polyhedral oligomeric silsesquioxane (POSS);

[0010] (2) Under a nitrogen atmosphere, polyhedral oligomeric silsesquioxane, diamine monomer and dianhydride monomer are reacted in an organic solvent to obtain polyhedral oligomeric silsesquioxane modified polyamic acid solution (PAA / POSS solution).

[0011] (3) Add the light absorber particles and mechanical reinforcement phase particles to the polyhedral oligomeric silsesquioxane modified polyamic acid solution and mix evenly to obtain a precursor slurry. Use plasma spraying to imidize the precursor slurry and spray it onto the pretreated substrate surface to prepare the matte coating that is resistant to high temperature extreme environment.

[0012] Existing polyimide materials are severely corroded after exposure to atomic oxygen in Low Earth Orbit (LEO). To address this technical problem, this invention introduces POSS into the polyimide system. The copolymerization of POSS is chemically bonded to the organic chain, forming an organic-inorganic nano-hybrid material. When the POSS-doped polyimide is exposed to extreme environments such as atomic oxygen, the organic matter is degraded, forming a silica passivation layer that enhances resistance to atomic oxygen attack. This silica passivation layer protects the underlying polymer from further degradation. Simultaneously, the introduction of light-absorbing particles and mechanically reinforcing phase particles also improves the coating's mechanical properties and its tolerance to harsh environments such as high temperatures, abrasion, and radiation.

[0013] In step (1), the organic solvent includes tetrahydrofuran, chloroform or toluene; the silane coupling agent includes 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, methylchlorosilane, dimethylchlorosilane or cyclohexyltrichlorosilane; the volume ratio of organic solvent to silane coupling agent is 1:0.4-3; the reaction conditions are 0-40℃, 24-72 hours.

[0014] Preferably, in step (1), the polyhedral oligomeric silsesquioxane is an aminated polyhedral oligomeric silsesquioxane (NH2-POSS) formed by an organic solvent and an aminosilane coupling agent under the action of a catalyst. NH2-POSS has better dispersibility and temperature resistance.

[0015] Preferably, in step (2), the mass ratio of polyhedral oligomeric silsesquioxane, diamine monomer and dianhydride monomer is 1:30-80:10-70; the reaction conditions are ice-water bath, 24-72 hours.

[0016] The diamine monomers include, but are not limited to, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylmethane, 4,4'-diaminobiphenyl, p-phenylenediamine, 4,4'-diaminodiphenyl sulfone, 2,2-bis[4-(2,4-diaminophenoxy)phenyl]propane, 1,4'-diaminocyclohexane, etc.

[0017] The dianhydride monomers mentioned include, but are not limited to, pyromellitic anhydride and hexafluorodianhydride.

[0018] Optionally, in step (3), the light-absorbing particles are at least one of boron carbide B4C, zirconium boride ZrB2, silicon boride SiB2, titanium carbide TiC, and black titanium dioxide TiO2, with an average particle size of 10-80 nm.

[0019] The light-absorbing particles are further preferably zirconium boride (ZrB2) or silicon boride (SiB2).

[0020] Optionally, in step (3), the mechanically reinforcing phase particles are at least one of silicon dioxide (SiO2), silicon nitride (Si3N4), zirconium dioxide (ZrO2), and aluminum oxide (Al2O3), with an average particle size of 5-100 nm.

[0021] The mechanically reinforcing phase particles are further preferably silicon dioxide (SiO2) or zirconium dioxide (ZrO2).

[0022] The polyhedral oligomeric silsesquioxane-modified polyamic acid solution is used as the binder phase in the precursor slurry. Preferably, the content of light absorber particles is 2-50 wt% and the content of mechanically reinforcing phase particles is 0.5-8 wt% based on the mass of the polyhedral oligomeric silsesquioxane-modified polyamic acid solution.

[0023] The matrix includes, but is not limited to, aluminum alloys, titanium alloys, copper alloys, stainless steel, carbon fiber materials, or polyimide materials.

[0024] Specifically, the substrate pretreatment methods include at least one of cleaning, drying, sandblasting, or blackening.

[0025] During plasma spraying, the precursor slurry is ultrasonically atomized, imidized under the action of a plasma spraying heat source, and then sprayed and cured onto the pretreated substrate surface. The parameters include: ultrasonic power 20-50 kHz, peristaltic pump speed 20-60 rpm, compressed air pressure 0.1-0.8 MPa, spraying angle 0°-180°, spraying current 300-800 A, spraying voltage 30-60 V, spraying material flow rate 10-50 mL / min, spraying distance 50-300 mm, plasma spray gun moving speed 800-2000 mm / s, and the number of coating passes 5-50.

[0026] Preferably, the parameters for plasma spraying include: ultrasonic power of 20-30 kHz, peristaltic pump speed of 40-50 rpm, compressed air pressure of 0.2-0.4 MPa, spraying angle of 0°-90°, spraying current of 300-500 A, spraying voltage of 40-60 V, spraying material flow rate of 15-30 ml / min, spraying distance of 100-150 mm, plasma spray gun moving speed of 800-900 mm / s, and 8-20 coats of coating.

[0027] The present invention also provides a method for preparing a matte coating resistant to high temperature extreme environments, resulting in a matte coating resistant to high temperature extreme environments.

[0028] Preferably, the thickness of the matte coating for high-temperature extreme environments is 10-100μm; the matte coating for high-temperature extreme environments has an absorption rate (solar absorptivity) of ≥99% for ultraviolet-visible-near-infrared light in the 300-2500nm wavelength band, exhibiting excellent light absorption performance.

[0029] The present invention also provides the application of the aforementioned high-temperature extreme environment resistant matte coating in the fields of space remote sensing, communication, optical instruments or aerospace.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] (1) In this invention, POSS is incorporated into the polyimide matrix, which can improve the coating’s resistance to extreme environments by forming a silicon passivation layer. Furthermore, the precursor slurry is prepared by compounding PAA / POSS solution, light absorber particles and mechanically reinforcing phase particles. The raw materials have good compatibility, and the compounding of the three raw materials can effectively improve the light absorbance, temperature resistance, mechanical properties and resistance to extreme environments of the product coating. In addition, the ultrasonic atomization plasma spraying technology is used, which is convenient to apply and can be used to process the surface, internal cavity and special configuration parts of key components, and the preparation cycle is short.

[0032] (2) The matte coating for high temperature extreme environment prepared by the method of the present invention has the comprehensive characteristics of high light absorption, high temperature resistance, friction resistance, and resistance to space radiation such as atomic oxygen, ultraviolet, proton, and electron. It can meet the requirements of low orbit and long life, and has good application prospects and economic benefits. Attached Figure Description

[0033] Figure 1 The graph shows the absorbance of the matte coating for high-temperature extreme environments prepared in Example 1.

[0034] Figure 2 The image shows the test results of the adhesion between the matte coating and the substrate prepared in Example 1, which is resistant to high temperature and extreme environment. The left image is before the test, and the right image is after the test.

[0035] Figure 3 The graph shows the tribological performance test results of the matte coating resistant to high temperature extreme environments prepared in Example 3. The left graph is before the test, and the right graph is after the test. Detailed Implementation

[0036] The present invention will be further illustrated below with reference to the embodiments and accompanying drawings. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0037] In the examples, the light-absorbing particles and the mechanically reinforcing phase material were purchased from Hagenas (China) Co., Ltd.

[0038] Example 1

[0039] In this embodiment, the light-absorbing particles are silicon boride (average particle size 50 nm), the mechanically reinforcing phase material is zirconium dioxide (average particle size 20 nm), and the preparation method of the matting coating resistant to high-temperature extreme environments includes:

[0040] (1) Add 100 mL of tetrahydrofuran to 100 mL of 3-aminopropyltriethoxysilane, then add 20 mL of hydrochloric acid as a reaction catalyst. After mixing and stirring at 25 °C for 72 hours, wash once with anhydrous ethanol and dry in an oven at 70 °C to obtain white crystals NH2-POSS.

[0041] (2) Take 1g of NH2-POSS and mix it with 50g of 4,4'-diaminodiphenyl ether, then add 500mL of N-methylpyrrolidone, mix and stir for 8 hours to dissolve, then add 50g of pyromellitic anhydride to the above solution, stir and react for 72 hours in an ice-water bath and nitrogen atmosphere to obtain PAA / NH2-POSS solution;

[0042] (3) 50g of light-absorbing agent SiB2 particles and 1g of mechanically reinforcing phase ZrO2 particles were added sequentially to 100g of PAA / NH2-POSS solution and mechanically stirred for 24 hours to prepare a precursor slurry. The precursor slurry was atomized using an ultrasonic atomizing nozzle and then imidized and sprayed onto a sandblasted aluminum alloy substrate under the action of a plasma spraying heat source. Specifically, the ultrasonic power was 50kHZ, the peristaltic pump speed was 50rpm, the compressed air pressure was 0.3MPa, the spraying angle was 90°, the spraying current was 300A, the spraying voltage was 30V, the spraying material flow rate was 10mL / min, the spraying distance was 100mm, the plasma spray gun moving speed was 1000mm / s, and the coating was sprayed 6 times to obtain a matte coating resistant to high temperature extreme environments.

[0043] Example 2

[0044] In this embodiment, the light-absorbing particles are zirconium boride (average particle size of 30 nm), the mechanically reinforcing phase material is silicon dioxide (average particle size of 20 nm), and the preparation method of the matting coating resistant to high-temperature extreme environments includes:

[0045] (1) Add 60 mL of tetrahydrofuran to 80 mL of 3-aminopropyltriethoxysilane, then add 15 mL of hydrochloric acid as a reaction catalyst. After mixing and stirring at 25 °C for 48 hours, wash twice with anhydrous ethanol and dry in an oven at 70 °C to obtain white crystals NH2-POSS.

[0046] (2) Take 1g of NH2-POSS and mix it with 40g of 4,4'-diaminodiphenyl ether, then add 400mL of N-methylpyrrolidone, mix and stir for 8 hours to dissolve, then add 10g of pyromellitic anhydride to the above solution, stir and react for 72 hours in an ice-water bath and nitrogen atmosphere to obtain PAA / NH2-POSS solution;

[0047] (3) 50g of light-absorbing agent ZrB2 particles and 0.5g of mechanically reinforcing phase SiO2 particles were added sequentially to 100g of PAA / NH2-POSS solution and mechanically stirred for 24 hours to prepare a precursor slurry. The precursor slurry was atomized using an ultrasonic atomizing nozzle and then imidized and sprayed onto a sandblasted aluminum alloy substrate under the action of a plasma spraying heat source. Specifically, the ultrasonic power was 20kHZ, the peristaltic pump speed was 30rpm, the compressed air pressure was 0.4MPa, the spraying angle was 90°, the spraying current was 400A, the spraying voltage was 40V, the spraying material flow rate was 10mL / min, the spraying distance was 150mm, the plasma spray gun moving speed was 800mm / s, and the coating was sprayed 20 times to obtain a matte coating resistant to high temperature extreme environments.

[0048] Example 3

[0049] In this embodiment, the light-absorbing particles are boron carbide (average particle size 60 nm), the mechanically reinforcing phase material is silicon nitride (average particle size 75 nm), and the preparation method of the matting coating resistant to high-temperature extreme environments includes:

[0050] (1) Add 150 mL of tetrahydrofuran to 150 mL of 3-aminopropyltriethoxysilane, then add 30 mL of hydrochloric acid as a reaction catalyst. After mixing and stirring at 25 °C for 48 hours, wash three times with anhydrous ethanol and dry in an oven at 70 °C to obtain white crystals NH2-POSS.

[0051] (2) Take 1g of NH2-POSS and mix it with 80g of 4,4'-diaminodiphenyl ether, then add 800mL of N-methylpyrrolidone, mix and stir for 5 hours to dissolve, then add 70g of pyromellitic anhydride to the above solution, stir and react for 48 hours in an ice-water bath and nitrogen atmosphere to obtain PAA / NH2-POSS solution;

[0052] (3) 30g of light absorber B4C particles and 8g of mechanically reinforcing phase Si3N4 particles were added sequentially to 100g of PAA / NH2-POSS solution and mechanically stirred for 48 hours to prepare a precursor slurry. The precursor slurry was atomized using an ultrasonic atomizing nozzle and then imidized and sprayed onto a sandblasted aluminum alloy substrate under the action of a plasma spraying heat source. Specifically, the ultrasonic power was 30kHZ, the peristaltic pump speed was 40rpm, the compressed air pressure was 0.4MPa, the spraying angle was 120°, the spraying current was 500A, the spraying voltage was 50V, the spraying material flow rate was 15mL / min, the spraying distance was 120mm, the plasma spray gun moving speed was 1200mm / s, and the coating was sprayed 15 times to obtain a matte coating resistant to high temperature extreme environments.

[0053] Example 4

[0054] In this embodiment, the light-absorbing particles are selected from black titanium dioxide (average particle size of 60 nm), and the mechanically reinforcing phase material is selected from alumina (average particle size of 90 nm). The preparation method of the matte coating resistant to high-temperature extreme environments includes:

[0055] (1) Add 50 mL of tetrahydrofuran to 120 mL of 3-aminopropyltriethoxysilane, then add 15 mL of hydrochloric acid as a reaction catalyst. After mixing and stirring at 25 °C for 24 hours, wash once with anhydrous ethanol and dry in an oven at 70 °C to obtain white crystals NH2-POSS.

[0056] (2) Take 1g of NH2-POSS and mix it with 70g of 4,4'-diaminodiphenyl ether, then add 600mL of N-methylpyrrolidone, mix and stir for 5 hours to dissolve, then add 50g of pyromellitic anhydride to the above solution, stir and react for 24 hours in an ice-water bath and nitrogen atmosphere to obtain PAA / NH2-POSS solution;

[0057] (3) 2g of light-absorbing black TiO2 particles and 0.5g of mechanically reinforcing phase Al2O3 particles were added sequentially to 100g of PAA / NH2-POSS solution and mechanically stirred for 24 hours to prepare a precursor slurry. The precursor slurry was atomized using an ultrasonic atomizing nozzle and then imidized and sprayed onto a sandblasted aluminum alloy substrate under the action of a plasma spraying heat source. Specifically, the ultrasonic power was 20kHZ, the peristaltic pump speed was 20rpm, the compressed air pressure was 0.1MPa, the spraying angle was 120°, the spraying current was 300A, the spraying voltage was 30V, the spraying material flow rate was 10mL / min, the spraying distance was 50mm, the plasma spray gun moving speed was 800mm / s, and the coating was sprayed 5 times to obtain a matte coating resistant to high temperature extreme environments.

[0058] Sample Analysis

[0059] The high-temperature extreme environment resistant matte coatings prepared in Examples 1-4 were subjected to the following performance tests:

[0060] (1) Solar Absorption Ratio Test: Using a PerkinElmer Lambda 950 UV-Vis spectrophotometer, the solar absorptivity of the matting coatings prepared in Examples 1-3 in the UV-Vis-NIR band (300-2500nm) was measured to be greater than 99.0%. The absorbance curve of the representative matting coating of Example 1 is shown in the figure. Figure 1 As shown. The matte coating prepared in Example 4 has a solar absorptivity of approximately 98.5% in the ultraviolet-visible-near-infrared band.

[0061] (2) Visual inspection and mechanical strength testing: The bonding strength between the coating and the substrate was tested using a BGD504 / 2 cross-cut tester. After the cross-cut test, 3M tape was used for adhesion testing. Representative optical images of the matte coating before and after the test in Example 1 are shown below. Figure 2 As shown, the coating did not peel off significantly after the adhesion test. The adhesion (cross-cut test) between the matte coatings prepared in Examples 1-4 and the substrate was at the level of 0-1.

[0062] (3) Vacuum-atomic oxygen irradiation test: The YZY100-ZW atomic oxygen / ultraviolet integrated environment simulation test equipment was used, with a pressure not exceeding 1×10⁻⁶. -3 Under vacuum conditions of Pa, with an energy greater than 1.5 × 10⁻⁶ Pa, 21 atoms / cm 2 After irradiation with atomic oxygen, tests showed that the solar absorptivity of the matting coatings in Examples 1-3 decreased by no more than 1% after vacuum-atomic oxygen irradiation, and the solar absorptivity of the matting coating prepared in Example 4 decreased by 3.5% after vacuum-atomic oxygen irradiation. The hemispherical emissivity results showed no significant change.

[0063] Taking the matte coating in Example 2 as an example, the test results of the vacuum-atomic oxygen irradiation test are shown in Table 1.

[0064] Table 1. Test results of vacuum-atomic oxygen irradiation test

[0065]

[0066] (4) Vacuum-UV irradiation test: The YZY100-ZW atomic oxygen / UV integrated environment simulation test equipment was used, with a pressure not exceeding 1×10⁻⁶. -3Under vacuum conditions of Pa, after irradiation with 5000 ESH of ultraviolet light (including near-ultraviolet and far-ultraviolet bands), the results showed that the solar absorptivity of the matting coatings in Examples 1-4 decreased by no more than 1% after vacuum-ultraviolet irradiation, and the hemispherical emissivity did not change significantly.

[0067] Taking the matte coating in Example 2 as an example, the test results of the vacuum-ultraviolet irradiation test are shown in Table 2.

[0068] Table 2. Test results of vacuum-ultraviolet irradiation test

[0069]

[0070] (5) Vacuum-proton irradiation test: A YZY100-ZW atomic oxygen / ultraviolet integrated environment simulation test equipment, EFHS-100-2W electron gun, 6517B micro-ammeter, and SN-09 dual-beam accelerator were used under a pressure not exceeding 1×10⁻⁶. -3 Under vacuum conditions of Pa, with an energy of 50 keV, the cumulative flux is 2.5 × 10⁻⁶ Pa. 15 P / cm 2 After proton irradiation, tests showed that the solar absorptivity of the matting coatings in Examples 1-4 decreased by no more than 1%, and the hemispherical emissivity showed no significant change.

[0071] Taking the matte coating in Example 2 as an example, the test results of the vacuum-proton irradiation test are shown in Table 3.

[0072] Table 3. Test results of vacuum-proton irradiation experiment

[0073]

[0074] (6) Vacuum-electron irradiation test: A YZY100-ZW atomic oxygen / ultraviolet integrated environment simulation test equipment, EFHS-100-2W electron gun, 6517B micro-ammeter, and SN-09 dual-beam accelerator were used under a pressure not exceeding 1×10⁻⁶. -3 Under vacuum conditions of Pa, through an energy of 50 keV and a cumulative flux of 2.5 × 10⁻⁶ Pa, 16 e / cm 2 After electron irradiation, tests showed that the solar absorptivity of the matting coatings in Examples 1-4 decreased by no more than 1%, and the hemispherical emissivity showed no significant change.

[0075] Taking the matte coating in Example 2 as an example, the test results of the vacuum-electron irradiation test are shown in Table 4.

[0076] Table 4. Test results of vacuum-electron irradiation test

[0077]

[0078] (7) High temperature test: Under normal pressure, in an insulated box environment, after being kept at a temperature of 100-1200℃ for 1 hour, the solar absorption ratio of the matte coating in Examples 1-4 is not more than 1% attenuation;

[0079] Taking the matte coating in Example 3 as an example, the high-temperature test results are shown in Table 5.

[0080] Table 5. High Temperature Test Results

[0081]

[0082] (8) Friction and Wear and Appearance Observation: The surface wear of the coating and friction pair after rubbing was tested using a Bruker UMT-tribolab friction and wear testing machine. The matte coatings of Examples 1-4 were observed visually before and after rubbing to show no coating loss or peeling. The optical images of the matte coating of Example 3 before and after rubbing are shown below. Figure 3 As shown.

[0083] The embodiments described above provide a detailed explanation of the technical solutions of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, additions, or similar substitutions made within the scope of the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a matte coating resistant to high-temperature extreme environments, characterized in that, include: (1) Mix the organic solvent and silane coupling agent, add the catalyst and stir to react, wash and dry to obtain polyhedral oligomeric silsesquioxane. (2) Under a nitrogen atmosphere, polyhedral oligomeric silsesquioxane, diamine monomer and dianhydride monomer are reacted in an organic solvent to obtain a polyhedral oligomeric silsesquioxane modified polyamic acid solution. (3) Add the light absorber particles and mechanical reinforcement phase particles to the polyhedral oligomeric silsesquioxane modified polyamic acid solution and mix evenly to obtain a precursor slurry. Use plasma spraying to imidize the precursor slurry and spray it onto the pretreated substrate surface to prepare the matte coating that is resistant to high temperature extreme environment.

2. The method for preparing a matte coating resistant to high-temperature extreme environments according to claim 1, characterized in that, In step (1), the organic solvent includes tetrahydrofuran, chloroform or toluene; the silane coupling agent includes 3-aminopropyltriethoxysilane, 3-glycidoxypropyltrimethoxysilane, methylchlorosilane, dimethylchlorosilane or cyclohexyltrichlorosilane; the volume ratio of organic solvent to silane coupling agent is 1:0.4-3; the reaction conditions are 0-40℃, 24-72 hours.

3. The method for preparing a matte coating resistant to high-temperature extreme environments according to claim 1, characterized in that, In step (2), the mass ratio of polyhedral oligomeric silsesquioxane, diamine monomer and dianhydride monomer is 1:30-80:10-70; the reaction conditions are ice-water bath, 24-72 hours.

4. The method for preparing a matte coating resistant to high-temperature extreme environments according to claim 1, characterized in that, In step (3), the light-absorbing particles are at least one of boron carbide, zirconium boride, silicon boride, titanium carbide, and black titanium dioxide, with an average particle size of 10-80 nm.

5. The method for preparing a matte coating resistant to high-temperature extreme environments according to claim 1, characterized in that, In step (3), the mechanically reinforcing phase particles are at least one of silicon dioxide, silicon nitride, zirconium dioxide, and aluminum oxide, with an average particle size of 5-100 nm.

6. The method for preparing a matte coating resistant to high-temperature extreme environments according to claim 1, characterized in that, Based on the mass of the polyhedral oligomeric silsesquioxane-modified polyamic acid solution, the content of light-absorbing particles is 2-50 wt%, and the content of mechanically reinforcing phase particles is 0.5-8 wt%.

7. The method for preparing a matte coating resistant to high-temperature extreme environments according to claim 1, characterized in that, The matrix includes aluminum alloy, titanium alloy, copper alloy, stainless steel, carbon fiber material or polyimide material.

8. The method for preparing a matte coating resistant to high-temperature extreme environments according to claim 1, characterized in that, During plasma spraying, the precursor slurry is ultrasonically atomized, imidized under the action of a plasma spraying heat source, and then sprayed and cured onto the pretreated substrate surface. The parameters include: ultrasonic power 20-50 kHz, peristaltic pump speed 20-60 rpm, compressed air pressure 0.1-0.8 MPa, spraying angle 0°-180°, spraying current 300-800 A, spraying voltage 30-60 V, spraying material flow rate 10-50 mL / min, spraying distance 50-300 mm, plasma spray gun moving speed 800-2000 mm / s, and the number of coating passes 5-50.

9. A matte coating resistant to high temperature extreme environments prepared by the method for preparing a matte coating resistant to high temperature extreme environments according to any one of claims 1-8.

10. The application of the high-temperature extreme environment resistant matte coating according to claim 9 in the fields of space remote sensing, communication, optical instruments or aerospace.

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