High-infrared-emissivity filler, high-infrared-emissivity finish paint as well as preparation method and application of high-infrared-emissivity filler

Abstract

The invention discloses high-infrared-emissivity filler, high-infrared-emissivity finish paint and a preparation method and application of the high-infrared-emissivity filler and the high-infrared-emissivity finish paint. The high-infrared-emissivity filler comprises an oxide of at least one of VIII-family transition metal, VIIB-family transition metal and IIB-family transition metal, cordierite and a rare earth metal oxide. The high-infrared-emissivity filler disclosed by the invention has stable high infrared emissivity, and can effectively guarantee the high-emissivity function of the coating. Under the condition of thin coating, the finish paint with the high infrared emissivity can meet long-time environment-resistant adaptability, can keep a long-time stable high infrared emissivity function, has good flexibility, can reduce microcracks generated by vibration of a coating, and prolongs the service life of the coating.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and specifically relates to a high-infrared emissivity filler, a high-infrared emissivity topcoat, and a preparation method and application thereof. Background Art

[0002] High-emissivity special coatings have been widely used in fields such as aircraft, new buildings, and industrial energy-saving furnaces. Especially in the aircraft field, high-emissivity coatings play an extremely important role. Currently, high-emissivity coatings are mainly used for thermal protection and heat dissipation, and the operating temperature is relatively high. In the prior art, the research on the regulation of the emissivity of coatings by using different materials and different stimuli responses is relatively extensive, while there are very few reports on high-emissivity topcoats for aircraft.

[0003] As early as the 1960s and 1970s, the United States, Japan, etc. conducted theoretical research on single crystal materials of compounds with excellent radiation characteristics such as SiO2, SiC, Fe2O3, and TiO2. In the 1990s, the United States and Japan studied the infrared radiation materials of Mn 2+ doped cordierite and anodized aluminum oxide. The NASA Research Center in the United States compounded SiB and SiC in a certain proportion with silica sol to prepare an infrared radiation coating, and successfully prepared a relatively dense high-emissivity coating on the surface of the thermal insulation felt to seal the surface holes and pits, reduce the heat flux, protect the internal matrix from damage, and at the same time utilize the self-properties of the coating emitter to strengthen the surface heat radiation and convection, and radiate most of the heat back to the atmospheric environment, only allowing a small part of the heat to enter the thermal insulation material, so as to improve the matrix protection performance. The United States designed a classic radiation-type metal protection system for reusable aircraft, and prepared a SiC coating with high emissivity on the surface of the metal honeycomb panel to improve the protection. However, studies have shown that it is difficult for the infrared emissivity of a single material to continuously maintain a high emissivity. In addition, most current high-emissivity coatings are mainly used for high-temperature thermal protection. The coating thickness is thick, which is not conducive to achieving the lightweight goal, and there are certain limitations in the scope of use. Moreover, there are no requirements for flexible physical and mechanical properties, the brittleness is large, and it is easy to crack. Currently, the application of high-emissivity coatings as weather-resistant topcoats is very few, and the emissivity of the coatings (8-14μm) is mostly below 0.8, the weather resistance is poor, and the emissivity drops severely after a long time of environmental adaptability and cannot maintain a stable high emissivity. The application of flexible weather-resistant coatings on the surface of aircraft is less. Due to the lightweight requirement, the coating needs to be thinly applied, and the flexible index requires a relatively small amount of pigment and filler to be added. Therefore, it is easy to cause poor weather resistance and cannot meet the high weather resistance requirements of aircraft. Therefore, it is very necessary to prepare a stable and long-lasting high-infrared emissivity filler and to prepare a stable and long-lasting weather-resistant topcoat with high emissivity. Summary of the Invention

[0004] To solve the problems existing in the prior art, the present invention provides a high-infrared emissivity filler, a high-infrared emissivity topcoat, and their preparation methods and applications. The high-infrared emissivity filler of the present invention has a stable and high infrared emissivity (≥0.8), which can effectively ensure the high emissivity function of the coating. The high-infrared emissivity topcoat of the present invention can meet the long-term environmental adaptability under the condition of thin coating, can maintain a long-term stable high-infrared emissivity function, and has good flexibility, which can reduce the microcracks generated by vibration of the coating and extend the service life of the coating.

[0005] One of the purposes of the present invention is to provide a high-infrared emissivity filler, which contains at least one oxide of Group VIII, Group VIIB, and Group IIB transition metals, cordierite, and rare earth metal oxides.

[0006] In a preferred embodiment of the present invention,

[0007] The particle size of the cordierite is 500-6000 mesh, preferably 2000-5000 mesh; and / or,

[0008] The rare earth metal oxide is selected from one or more of cerium oxide, ytterbium oxide, yttrium oxide, lanthanum oxide, and scandium oxide; preferably selected from one or more of cerium oxide, ytterbium oxide, and yttrium oxide; more preferably selected from one or more of cerium dioxide (CeO2), ytterbium sesquioxide (Yb2O3), and yttrium sesquioxide (Y2O3); further preferably a mixture of cerium dioxide, ytterbium sesquioxide, and yttrium sesquioxide; even more preferably, in the mixture of cerium dioxide, ytterbium sesquioxide, and yttrium sesquioxide, the mass ratio of cerium dioxide, ytterbium sesquioxide, and yttrium sesquioxide is 1:(0.2-5):(0.5-8), preferably 1:(0.5-2):(1.5-3); and / or,

[0009] The Group VIII transition metal is selected from at least one of iron, cobalt, nickel, palladium, rhodium, and platinum, preferably at least one of iron and cobalt; and / or,

[0010] The Group VIIB transition metal is selected from at least one of manganese, rhenium, and technetium, preferably manganese; and / or

[0011] The Group IIB transition metal is selected from at least one of zinc, cadmium, and mercury, preferably zinc; preferably,

[0012] The oxide of at least one of the Group VIII, Group VIIB, and Group IIB transition metals is at least one of iron oxide, manganese oxide, cobalt oxide, and zinc oxide; preferably at least one of iron(III) oxide, manganese dioxide, cobalt oxide, and zinc oxide; more preferably a mixture of iron(III) oxide, manganese dioxide, cobalt oxide, and zinc oxide; further preferably, in the mixture of iron(III) oxide, manganese dioxide, cobalt oxide, and zinc oxide, the mass ratio of iron(III) oxide, manganese dioxide, cobalt oxide, and zinc oxide is 1:(0.5 - 5):(0.1 - 4):(1 - 10), preferably 1:(1 - 2.5):(0.5 - 1.5):(2 - 4).

[0013] In a preferred embodiment of the present invention,

[0014] The particle size of the Fe2O3 is selected from one or two of 20 - 30 nm (Shanghai Yingcheng New Materials Co., Ltd., model: YC-Fe3O2-20W), 50 - 80 nm (Yumu (Ningbo) New Materials Co., Ltd.), and 500 - 800 nm (Beijiaer New Materials Co., Ltd., model: B-Fe2O3-500N); and / or,

[0015] The particle size of the MnO2 is selected from one or two of 5 - 10 μm (Jinghuang Technology Co., Ltd., model: JH-340), 20 - 45 μm (Jinghuang Technology Co., Ltd., model: JH-316), and 30 - 60 μm (Jinghuang Technology Co., Ltd., model: JH-361); and / or,

[0016] The particle size of the CoO is selected from one or two of 50 - 80 nm (Beijiaer New Materials Co., Ltd., model: B-Co3O4-50N), 100 - 150 nm (Beijiaer New Materials Co., Ltd., model: B-Co3O4-100N), and 500 - 800 nm (Beijiaer New Materials Co., Ltd., model: B-Co3O4-500N); and / or,

[0017] The particle size of the ZnO is selected from one or two of 20 - 50 nm (Beijiaer New Materials Co., Ltd., model: B-ZnO-20N), 300 - 500 nm (Beijiaer New Materials Co., Ltd., model: B-ZnO-300N), and 1 - 2 μm (Beijiaer New Materials Co., Ltd., model: B-ZnO-1W); and / or,

[0018] The cordierite is selected from one or two of cordierite with a particle size of 2000 mesh, 3000 mesh, and 5000 mesh from Fengju Mineral Products Processing Co., Ltd.; and / or,

[0019] The rare earth powder is selected from one or more of CeO2 (Jinghuang Technology Co., Ltd., model: JH-101, particle size: ≤1 μm; Jinghuang Technology Co., Ltd., model: JH-202, particle size: 1-2 μm; Beijiaer New Materials Co., Ltd., model: B-CeO2-10-30N, particle size: 10-30 nm), Yb2O3 (Jinghuang Technology Co., Ltd., model: JH-101, particle size: 5-10 μm; Jinghuang Technology Co., Ltd., model: JH-202, particle size: 10-20 μm; Beijiaer New Materials Co., Ltd., model: B-Yb2O3-80N, particle size: 80 nm), and Y2O3 (Jinghuang Technology Co., Ltd., model: JH-404, particle size: ≤0.5 μm; Jinghuang Technology Co., Ltd., model: JH-501, particle size: ≤2 μm; Beijiaer New Materials Co., Ltd., model: B-Y2O3-30-60N, particle size: 30-60 nm).

[0020] In a preferred embodiment of the present invention,

[0021] In the high-infrared emissivity filler, the mass ratio of cordierite to the oxide of at least one of Group VIII, Group VIIB, and Group IIB transition metals and rare earth metal oxide is 1:(0.35-0.70):(0.01-0.05), preferably 1:(0.40-0.60):(0.02-0.04).

[0022] The second object of the present invention is to provide a preparation method of the high-infrared emissivity filler of the first object of the present invention, including the steps of sintering the oxide of at least one of Group VIII, Group VIIB, and Group IIB transition metals, and then adding components including cordierite and rare earth metal oxide and sintering again to obtain the high-infrared emissivity filler.

[0023] In a preferred embodiment of the present invention,

[0024] The conditions for sintering the oxide of at least one of Group VIII, Group VIIB, and Group IIB transition metals include: the heating rate is 100-500 °C / h, preferably 200-300 °C / h, heating to 900-1000 °C, and holding for 1-8 h; preferably, the sintering is carried out in a reducing atmosphere; and / or,

[0025] The conditions for adding components including cordierite and rare earth metal oxide and sintering again include: the heating rate is 100-500 °C / h, preferably 300-400 °C / h, heating to 1060-1200 °C, and holding for 1-4 h; preferably, the sintering again is carried out in a protective atmosphere.

[0026] The preparation method of the high-infrared emissivity filler of the present invention can adopt the following specific technical solutions:

[0027] 1) Grind the oxides of at least one of Group VIII, Group VIIB, and Group IIB transition metals (here, grinding refers to grinding through an agate mortar, the function of which is to disperse the agglomerated powder evenly, mix various oxides evenly, and grind until a uniform powder is obtained without obvious granularity), tablet (here, tableting is for various powders to fully react during sintering, and after sintering is completed, powder can be obtained through grinding), and then conduct high-temperature sintering;

[0028] 2) Mix and grind, and tablet cordierite, rare earth metal oxides, and the sintered powder obtained in step 1);

[0029] 3) Conduct high-temperature sintering on the mixed tablet obtained in step 2), cool, grind, and screen to obtain the high-infrared emissivity filler.

[0030] The third object of the present invention is to provide a high-infrared emissivity topcoat, which contains the high-infrared emissivity filler of the first object of the present invention or the high-infrared emissivity filler prepared by the preparation method of the second object of the present invention.

[0031] In a preferred embodiment of the present invention,

[0032] the high-infrared emissivity topcoat contains component A and component B;

[0033] Component A includes fluorocarbon resin, high-infrared emissivity filler, muscovite powder, titanium dioxide, graphene, ultraviolet light absorber, light stabilizer, mildew-proof agent, and solvent;

[0034] Based on 100 parts by weight of fluorocarbon resin, each component in component A is as follows:

[0035] High-infrared emissivity filler: 10 - 40 parts by weight; preferably 15 - 32 parts by weight;

[0036] Muscovite powder: 5 - 15 parts by weight; preferably 8 - 12 parts by weight;

[0037] Titanium dioxide: 20 - 35 parts by weight; preferably 24 - 32 parts by weight;

[0038] Graphene: 1 - 8 parts by weight; preferably 2 - 6 parts by weight;

[0039] Ultraviolet light absorber: 2 - 8 parts by weight; preferably 2 - 6 parts by weight;

[0040] Light stabilizer: 1 - 4 parts by weight; preferably 1 - 3 parts by weight;

[0041] Mildew-proof agent: 2 - 8 parts by weight; preferably 3 - 6 parts by weight;

[0042] 20 - 80 parts by weight of solvent; preferably 20 - 60 parts by weight;

[0043] The component B includes molecular sieve, curing agent and adhesion promoter;

[0044] Based on 100 parts by weight of the curing agent, the components in component B are as follows:

[0045] 0.2 - 1.0 parts by weight of molecular sieve; preferably 0.2 - 0.4 parts by weight;

[0046] 1 - 6 parts by weight of adhesion promoter; preferably 2 - 5 parts by weight;

[0047] The mass ratio range of component A and component B is (8 - 15):1, preferably (10 - 13):1.

[0048] Conventional components in the art, such as ultrafine talc powder, anti - settling agent, leveling agent, defoaming agent, wetting and dispersing agent, etc., can also be added to component A. Conventional components in the art, such as pigments, etc., can also be added to component B, and their dosages are also conventional dosages, which can be added by those skilled in the art according to actual needs; preferably, based on 100 parts by weight of fluorocarbon resin, the ultrafine talc powder is 10 - 40 parts by weight; preferably 15 - 26 parts by weight; the anti - settling agent is 1 - 4 parts by weight; preferably 1.5 - 3.2 parts by weight; the defoaming agent is 1 - 5 parts by weight; preferably 2.5 - 4.5 parts by weight; the leveling agent is 1 - 8 parts by weight; preferably 2 - 6 parts by weight; the wetting and dispersing agent is 2 - 8 parts by weight; preferably 5 - 8 parts by weight.

[0049] In a preferred embodiment of the present invention,

[0050] The fluorocarbon resin is selected from at least one of organosilicon - modified fluorocarbon resins, preferably selected from at least one of siloxane - modified fluorocarbon resins, more preferably selected from one or more of LS - 8722 of Guangzhou Liyuan Industrial Materials Co., Ltd. and SF - 8421 of Yuyao Huihong Plastic Factory; and / or,

[0051] The muscovite powder is the conventional wet - process muscovite powder in the art, preferably the particle size of the wet - process muscovite powder is 1000 - 1250 mesh; and / or,

[0052] The titanium dioxide is the conventional titanium dioxide in the art, and in the present invention, it is preferably selected from one or more of R930 of Shuangma Chemical Co., Ltd., BA01 - 01 of Lanke Chemical Co., Ltd., and R - 6618 of Guangzhou Yantai Industrial Co., Ltd.; and / or,

[0053] The graphene is the conventional graphene in the art, and in the present invention, it is preferably selected from one or more of XF001W of Xianfeng Nano Materials Technology Co., Ltd. and JCHGNP of Jiacai Technology Co., Ltd.; and / or,

[0054] The ultrafine talcum powder is the conventional ultrafine talcum powder in the art, and in the present invention, it is preferably selected from one or more of YM-T160 of Shuangma Chemical Co., Ltd. and BT-6 of Baota Sericite Mining Co., Ltd.; and / or,

[0055] The anti-settling agent is the conventional anti-settling agent in the art, and in the present invention, it is preferably selected from one or more of BYK-410 of BYK of Germany, MPA-1078 of Delqian, and VOK-8100 of Wacker; and / or,

[0056] The ultraviolet absorber is selected from at least one of benzotriazole ultraviolet absorbers, and is preferably selected from one or more of UV-234 of Nanjing Hualiming Chemical Co., Ltd., Tinuvin 329 of BASF of Germany, and UV-3346 of Cytec Industries Inc. of the United States; and / or,

[0057] The light stabilizer is selected from at least one of hindered amine light stabilizers, and is preferably selected from one or more of UV-292 of Nanjing Hualiming Chemical Co., Ltd., UV-123 of Nanjing Milan New Materials, and 770 of BASF of Germany; and / or,

[0058] The mildew-proof agent is selected from at least one of benzimidazole mildew-proof agents, and is preferably selected from one or more of WF300 of Guangzhou Lily New Materials Co., Ltd. and MB-16 of Elementis Specialties; and / or,

[0059] The defoaming agent is the conventional defoaming agent in the art, and in the present invention, it is preferably selected from one or more of silicone defoaming agents, and is preferably selected from one or more of BYK-065 of BYK, AFCONA-2020 of Evonik, and AFE-7160 of Dow Corning; and / or,

[0060] The leveling agent is the conventional leveling agent in the art, and in the present invention, it is preferably selected from one or more of FL3600 of BASF of Germany and 420 of Qihua Chemical Co., Ltd.; and / or,

[0061] The wetting and dispersing agent is the conventional wetting and dispersing agent in the art, and in the present invention, it is preferably selected from one or more of AFCONA-4015 of Evonik, FL3772 of BASF of Germany, and BYK-103 of BYK; and / or,

[0062] The solvent is the conventional solvent in the art, and in the present invention, it is preferably selected from one or more of butyl acetate, ethyl acetate, and propylene glycol monomethyl ether acetate; and / or,

[0063] The curing agent is a conventional curing agent in the art, and in the present invention, is preferably selected from one or more isocyanate curing agents, more preferably one or more of Bayer's 3800 and Asahi Kasei's E402-90T; and / or,

[0064] The molecular sieve is a molecular sieve conventionally used as a water removal agent in the art, and in the present invention, is preferably a nano-scale microporous molecular sieve, preferably one or more selected from AOS of Aos Catalytic Materials (Dalian) Co., Ltd. and NA-Y of Hefa Environmental Protection Technology Co., Ltd.; and / or,

[0065] The adhesion promoter is selected from conventional promoters in the prior art, preferably one or more selected from Deqian 1121 and Jessica's JSC-1120.

[0066] The fourth object of the present invention is to provide a method for preparing the high infrared emissivity topcoat of the third object of the present invention, comprising: first mixing component A and component B according to the amount of each component, and then mixing component A and component B according to the amount ratio to obtain the high infrared emissivity topcoat. The topcoat can be applied by traditional air spraying, with a coating application period of 6 to 8 hours and a surface drying time of 30 to 60 minutes. It is simple to apply, has a smooth appearance, and has a uniform color. It has excellent comprehensive mechanical properties, an elongation at break of more than 80%, excellent adhesion, and good flexibility. It can meet good environmental adaptability even with a thin coating, can maintain an infrared emissivity of more than 0.7 (preferably 0.8) for a long time, and can effectively prevent microcracks caused by vibration, greatly improving the functional stability and life of the coating.

[0067] The preparation method of the high infrared emissivity topcoat of the present invention preferably comprises the following steps:

[0068] (1) Add solvent, organosilicon-modified fluorocarbon resin, anti-settling agent, ultraviolet light absorber, light stabilizer, antifungal agent, defoamer, leveling agent, and wetting dispersant to a paint can in sequence, stir for 0.5 to 1 hour until uniformly dispersed, then add high infrared emissivity filler, wet-process muscovite powder, titanium dioxide, graphene, and ultrafine talc powder, stir for 0.2 to 0.5 hour until uniformly dispersed. Grind and disperse with a sand mill until the fineness is ≤30 μm, filter the material, and seal and package to obtain component A; preferably, the solid content of component A is 55% to 66%;

[0069] (2) Stirring the curing agent, molecular sieve, and adhesion promoter in a closed container for 0.2 to 0.5 h, filtering the material, and sealing and packaging to obtain component B;

[0070] (3) Component A and component B are mixed in a mass ratio of (8-15):1 to obtain the flexible weather-resistant high-emissivity topcoat.

[0071] A fifth object of the present invention is to provide an application of a high-infrared emissivity filler of one of the objects of the present invention, or a high-infrared emissivity filler obtained by the preparation method of the second object of the present invention, or a high-infrared emissivity topcoat of the third object of the present invention, or a high-infrared emissivity topcoat obtained by the preparation method of the fourth object of the present invention in the outer skin of an aircraft.

[0072] Generally speaking, components such as pigments, fillers, and resins commonly used in coatings all have a certain absorption capacity for infrared radiation, which will reduce the intrinsic emissivity. Therefore, it is quite difficult to ensure that the coating has a stable and long-lasting high infrared emissivity (8 - 14 μm) in various complex environments. The technical solution of the present invention realizes the function of the weather-resistant topcoat to maintain a high infrared emissivity (≥0.8, preferably ≥0.9) for a long time. The present invention realizes the preparation of a flexible weather-resistant topcoat for an aircraft. Under the condition of ensuring a thin coating, the coating has good flexibility and excellent environmental adaptability, can prevent microcracks in the coating caused by vibration, extends the service life of the coating, and enhances the protective effect of the coating.

[0073] The preparation process of the high-infrared emissivity (8 - 14 μm) filler prepared by the method of the present invention is simple. By element doping, a filler with a stable and long-lasting high infrared emissivity is prepared, which has high chemical stability and dispersibility, can be evenly dispersed in the coating system, and plays a certain role in weather resistance and corrosion prevention.

[0074] The flexible weather-resistant high-infrared emissivity topcoat prepared by the method of the present invention has a good pot life, can be applied by traditional air spraying, the coating has a long-term stable high infrared emissivity, liquid medium resistance, and environmental adaptability, has good flexibility, and can play functions such as high emissivity and weather resistance. Detailed Embodiments

[0075] The present invention will be specifically described below in conjunction with specific embodiments. It is necessary to point out here that the following embodiments are only used for further illustration of the present invention and cannot be understood as limiting the protection scope of the present invention. Some non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention still fall within the protection scope of the present invention.

[0076] The raw materials used in the embodiments of the present invention are all conventional commercially available raw materials.

[0077] Example 1

[0078] Preparation of high-infrared emissivity filler:

[0079] 1) Grind 6 parts by weight of Fe2O3 of model YC-Fe3O2-20W, 12 parts by weight of MnO2 of model JH-340, 8 parts by weight of CoO of model B-Co3O4-50N, and 22 parts by weight of ZnO of model B-ZnO-20N thoroughly, press them into tablets, and under a reducing atmosphere (decomposed ammonia gas), heat them to 1000 °C at a heating rate of 300 °C / h, keep them sintered for 2 h, then cool and grind to obtain a multiphase composite powder;

[0080] 2) Add 100 parts by weight of 5000-mesh cordierite powder as the base material, add 2.6 parts by weight of rare earth powder (wherein, 20% is CeO2 of model JH-101, 30% is Yb2O3 of model JH-101, and 50% is Y2O3 of model B-Y2O3-30-60N), and grind and press them thoroughly with the multiphase composite powder obtained in step 1);

[0081] 3) Under a nitrogen atmosphere, heat them to 1160 °C at a heating rate of 380 °C / h, keep them sintered for 2 h again, cool, grind, and screen to obtain modified cordierite powder with high infrared emissivity (i.e., high infrared emissivity filler), and the particle size is 5 - 20 microns.

[0082] Preparation of high infrared emissivity topcoat:

[0083] (1) Add 45 parts by weight of butyl acetate, 100 parts by weight of organosilicon-modified fluorocarbon resin LS-8722, 1.8 parts by weight of anti-settling agent BYK-140, 4.8 parts by weight of ultraviolet light absorber UV-234, 2.4 parts by weight of light stabilizer UV-292, 4.5 parts by weight of anti-mold agent MB-16, 3.0 parts by weight of defoaming agent BYK-065, 3.5 parts by weight of leveling agent FL3600, and 6.8 parts by weight of wetting and dispersing agent BYK-103 into the paint-making tank in sequence. After stirring for 1 h until evenly dispersed, then add 28 parts by weight of high infrared emissivity filler, 10 parts by weight of 1250-mesh wet-process muscovite powder, 25 parts by weight of titanium dioxide R930, 2.8 parts by weight of graphene XF001W, and 15 parts by weight of ultra-fine talc powder YM-T160, and stir for 0.5 h until evenly dispersed. Grind and disperse with a sand mill until the fineness ≤ 30 μm, filter and discharge, and seal and package to obtain Component A, and the solid content of Component A is 59.4%;

[0084] (2) Seal and stir 100 parts by weight of curing agent E402-90T, 0.2 parts by weight of molecular sieve AOS, and 2.8 parts by weight of adhesion promoter 1121 in a container for 0.2 h, filter and discharge, and seal and package to obtain Component B;

[0085] (3) Mix Component A and Component B in a weight ratio of 13:1 to obtain the high infrared emissivity topcoat.

[0086] Example 2

[0087] Preparation of high-infrared emissivity filler:

[0088] 1) Grind 8 parts by weight of Fe2O3 from Yumu (Ningbo) New Materials Co., Ltd., 14 parts by weight of MnO2 with model JH-316, 6 parts by weight of CoO with model B-Co3O4-100N, and 26 parts by weight of ZnO with model B-ZnO-300N thoroughly, press them into tablets, and under a reducing atmosphere (decomposed ammonia gas), heat them to 980 °C at a heating rate of 280 °C / h, keep them sintered for 2 h, and then cool and grind to obtain a multiphase composite powder;

[0089] 2) Add 100 parts by weight of 3000-mesh cordierite powder as the base material, add 3.2 parts by weight of rare earth powder (wherein, 25% is CeO2 with model JH-202, 25% is Yb2O3 with model JH-202, and 50% is Y2O3 with model JH-404), and grind and press them thoroughly with the multiphase composite powder obtained in step 1);

[0090] 3) Under a nitrogen atmosphere, heat them to 1100 °C at a heating rate of 360 °C / h, keep them sintered for 2 h again, cool, grind, and sieve to obtain modified cordierite powder with high-infrared emissivity (i.e., high-infrared emissivity filler), and the particle size is 5 - 20 microns.

[0091] Preparation of high-infrared emissivity topcoat:

[0092] (1) Add 38 parts by weight of ethyl acetate, 100 parts by weight of organosilicon-modified fluorocarbon resin LS-8722, 2 parts by weight of anti-settling agent MPA-1078, 5.2 parts by weight of ultraviolet light absorber Tinuvin 329, 2.6 parts by weight of light stabilizer UV-123, 4.8 parts by weight of mildew-proof agent MB-16, 3.2 parts by weight of defoaming agent AFCONA-2020, 4.2 parts by weight of leveling agent FL3600, and 5.6 parts by weight of wetting and dispersing agent AFCONA-4015 into the paint-making tank in sequence. After stirring for 0.8 h until evenly dispersed, then add 25 parts by weight of high-infrared emissivity filler, 8 parts by weight of 1250-mesh wet-process muscovite powder, 29 parts by weight of titanium dioxide BA01-01, 2.5 parts by weight of graphene XF001W, and 19 parts by weight of ultrafine talc powder YM-T160, and stir for 0.3 h until evenly dispersed. Grind and disperse with a sand mill until the fineness ≤ 30 μm, filter and discharge, and seal and package to obtain Component A, and the solid content of Component A is 61.3%;

[0093] (2) In a container, 100 parts by weight of curing agent E402-90T, 0.3 parts by weight of molecular sieve AOS, and 2.5 parts by weight of adhesion promoter 1121 are sealed and stirred for 0.2 h, filtered and discharged, and then sealed and packaged to obtain Component B;

[0094] (3) The high-infrared emissivity topcoat is obtained by mixing Component A and Component B in a weight ratio of 11.8:1.

[0095] Example 3

[0096] Preparation of high-infrared emissivity filler:

[0097] 1) 10 parts by weight of Fe2O3 of model B-Fe3O2-500N, 16 parts by weight of MnO2 of model JH-361, 5 parts by weight of CoO of model B-Co3O4-500N, and 28 parts by weight of ZnO of model B-ZnO-1W are fully ground and pressed into tablets. Under a reducing atmosphere (decomposed ammonia gas), the temperature is raised to 950 °C at a heating rate of 250 °C / h, kept warm and sintered for 2 h, and then cooled and ground to obtain a multiphase composite powder;

[0098] 2) Add 100 parts by weight of 2000-mesh cordierite powder as the base material, add 3.0 parts by weight of rare earth powder (wherein, 23% is CeO2 of model B-CeO2-10-30N, 35% is Yb2O3 of model B-Yb2O3-80N, and 42% is Y2O3 of model JH-501), and fully grind and press it with the multiphase composite powder obtained in step 1);

[0099] 3) Under a nitrogen atmosphere, the temperature is raised to 1060 °C at a heating rate of 320 °C / h, kept warm and sintered for 2 h again, cooled, ground, and sieved to obtain modified cordierite powder with high-infrared emissivity (i.e., high-infrared emissivity filler), and the particle size is 5-20 microns.

[0100] Preparation of high-infrared emissivity topcoat:

[0101] (1) In the paint-making tank, add successively 12 parts by weight of butyl acetate, 10 parts by weight of propylene glycol methyl ether acetate, 100 parts by weight of silicone-modified fluorocarbon resin SF-8421, 2.3 parts by weight of anti-settling agent VOK-8100, 5.6 parts by weight of ultraviolet absorber UV-3346, 2.8 parts by weight of light stabilizer 770, 5.0 parts by weight of mildew-proof agent WF300, 3.5 parts by weight of defoamer AFE-7160, 3.9 parts by weight of leveling agent 420, 5.2 parts by weight of wetting and dispersing agent FL3772. After stirring for 0.6 h until evenly dispersed, then add 22 parts by weight of high-infrared emissivity filler, 12 parts by weight of 1000-mesh wet-process muscovite powder, 30 parts by weight of titanium dioxide R-6618, 2.2 parts by weight of graphene JCHGNP, 22 parts by weight of ultrafine talc powder BT-6, and stir for 0.2 h until evenly dispersed. Grind and disperse with a sand mill until the fineness is ≤ 30 μm, filter and discharge the material, and seal and package to obtain Component A, and the solid content of Component A is 63.5%;

[0102] (2) In a container, seal and stir 100 parts by weight of curing agent N3800, 0.26 parts by weight of molecular sieve NA-Y, and 3.6 parts by weight of adhesion promoter JSC-1120 for 0.2 h, filter and discharge the material, and seal and package to obtain Component B;

[0103] (3) Mix Component A and Component B in a weight ratio of 10:1 to obtain the high-infrared emissivity topcoat.

[0104] Example 4

[0105] Preparation of high-infrared emissivity filler:

[0106] 1) Grind, tablet 10 parts by weight of Fe2O3 of model YC-Fe3O2-20W, 14 parts by weight of MnO2 of model JH-340, and 24 parts by weight of ZnO of model B-ZnO-20N. Under a reducing atmosphere (decomposed ammonia gas), heat up to 1000 °C at a heating rate of 300 °C / h, keep the temperature for sintering for 2 h, and then cool and grind to obtain a multiphase composite powder;

[0107] 2) Add 100 parts by weight of 5000-mesh cordierite powder as the base material, add 2.6 parts by weight of rare earth powder (wherein, 20% is CeO2 of model JH-101, 30% is Yb2O3 of model JH-101, and 50% is Y2O3 of model B-Y2O3-30-60N), and fully grind and tablet with the multiphase composite powder obtained in step 1);

[0108] 3) In a nitrogen atmosphere, the temperature was raised to 1160°C at a heating rate of 380°C / h, and the mixture was sintered again at this temperature for 2 hours. The mixture was cooled, ground, and sieved to obtain a modified cordierite powder with high infrared emissivity (i.e., a high infrared emissivity filler) with a particle size of 5 to 20 microns.

[0109] Preparation of high infrared emissivity topcoat:

[0110] (1) In a paint can, 45 parts by weight of butyl acetate, 100 parts by weight of silicone modified fluorocarbon resin LS-8722, 1.8 parts by weight of anti-settling agent BYK-140, 4.8 parts by weight of ultraviolet absorber UV-234, 2.4 parts by weight of light stabilizer UV-292, 4.5 parts by weight of anti-fungal agent MB-16, 3.0 parts by weight of defoamer BYK-065, 3.5 parts by weight of leveling agent FL3600, and 6.8 parts by weight of wetting and dispersing agent BYK-103 were added in sequence, and stirred for 1 hour until uniformly dispersed. Then, 28 parts by weight of high infrared emissivity filler, 10 parts by weight of 1250 mesh wet-process muscovite powder, 25 parts by weight of titanium dioxide R930, 2.8 parts by weight of graphene XF001W, and 15 parts by weight of ultrafine talc powder YM-T160 were added, and stirred for 0.5 hour until uniformly dispersed. Grind and disperse with a sand mill until the fineness is ≤30 μm, filter the material, and seal and package to obtain component A, the solid content of component A is 60.3%;

[0111] (2) In a container, 100 parts by weight of curing agent E402-90T, 0.2 parts by weight of molecular sieve AOS, and 2.8 parts by weight of adhesion promoter 1121 were sealed and stirred for 0.2 h, filtered, and sealed to obtain component B;

[0112] (3) Component A and component B are mixed in a weight ratio of 13:1 to obtain the high infrared emissivity topcoat.

[0113] Example 5

[0114] Preparation of high infrared emissivity filler:

[0115] 1) 6 parts by weight of Fe2O3 of model YC-Fe3O2-20W, 12 parts by weight of MnO2 of model JH-340, 8 parts by weight of CoO of model B-Co3O4-50N, and 22 parts by weight of ZnO of model B-ZnO-20N are fully ground and tableted, and heated to 1000°C at a heating rate of 300°C / h in a reducing atmosphere (decomposition of ammonia gas), sintered for 2 hours, and then cooled and ground to obtain a multiphase composite powder;

[0116] 2) Add 100 parts by weight of 5000-mesh cordierite powder as the base material, and add 2.6 parts by weight of rare earth powder (wherein, 40% is Yb2O3 of model JH-101, and 60% is Y2O3 of model B-Y2O3-30-60N), and perform sufficient grinding and tabletting on the composite powder obtained in step 1);

[0117] 3) Under a nitrogen atmosphere, heat up to 1160 °C at a heating rate of 380 °C / h, keep warm and sinter for another 2 h, cool, grind, and screen to obtain modified cordierite powder with high infrared emissivity (i.e., high infrared emissivity filler), and the particle size is 5 - 20 microns.

[0118] Preparation of high infrared emissivity topcoat:

[0119] (1) Add 45 parts by weight of butyl acetate, 100 parts by weight of organosilicon-modified fluorocarbon resin LS-8722, 1.8 parts by weight of anti-settling agent BYK-140, 4.8 parts by weight of ultraviolet light absorber UV-234, 2.4 parts by weight of light stabilizer UV-292, 4.5 parts by weight of mildew-proof agent MB-16, 3.0 parts by weight of defoaming agent BYK-065, 3.5 parts by weight of leveling agent FL3600, and 6.8 parts by weight of wetting and dispersing agent BYK-103 into the paint-making tank in sequence. After stirring for 1 h until uniformly dispersed, then add 28 parts by weight of high infrared emissivity filler, 10 parts by weight of 1250-mesh wet-process muscovite powder, 25 parts by weight of titanium dioxide R930, 2.8 parts by weight of graphene XF001W, and 15 parts by weight of ultrafine talc powder YM-T160, and stir for 0.5 h until uniformly dispersed. Grind and disperse with a sand mill until the fineness ≤ 30 μm, filter and discharge, and seal and package to obtain component A, and the solid content of component A is 59.8%;

[0120] (2) Seal and stir 100 parts by weight of curing agent E402-90T, 0.2 parts by weight of molecular sieve AOS, and 2.8 parts by weight of adhesion promoter 1121 in a container for 0.2 h, filter and discharge, and seal and package to obtain component B;

[0121] (3) Mix component A and component B according to a weight ratio of 13:1 to obtain the high infrared emissivity topcoat.

[0122] Example 6

[0123] Preparation of high infrared emissivity filler:

[0124] 1) 6 parts by weight of Fe2O3 of model YC-Fe3O2-20W, 12 parts by weight of MnO2 of model JH-340, 8 parts by weight of CoO of model B-Co3O4-50N, and 22 parts by weight of ZnO of model B-ZnO-20N are fully ground and tableted, and heated to 1000°C at a heating rate of 300°C / h in a reducing atmosphere (decomposition of ammonia gas), sintered for 2 hours, and then cooled and ground to obtain a multiphase composite powder;

[0125] 2) adding 100 parts by weight of 5000 mesh cordierite powder as a base material, adding 2.6 parts by weight of rare earth powder (of which 35% is CeO2 of model JH-101 and 65% is Y2O3 of model B-Y2O3-30-60N), and fully grinding and tableting the multiphase composite powder obtained in step 1);

[0126] 3) In a nitrogen atmosphere, the temperature was raised to 1160°C at a heating rate of 380°C / h, and the mixture was sintered again at this temperature for 2 hours. The mixture was cooled, ground, and sieved to obtain a modified cordierite powder with high infrared emissivity (i.e., a high infrared emissivity filler) with a particle size of 5 to 20 microns.

[0127] Preparation of high infrared emissivity topcoat:

[0128] (1) In a paint can, 45 parts by weight of butyl acetate, 100 parts by weight of silicone modified fluorocarbon resin LS-8722, 1.8 parts by weight of anti-settling agent BYK-140, 4.8 parts by weight of ultraviolet absorber UV-234, 2.4 parts by weight of light stabilizer UV-292, 4.5 parts by weight of anti-fungal agent MB-16, 3.0 parts by weight of defoamer BYK-065, 3.5 parts by weight of leveling agent FL3600, and 6.8 parts by weight of wetting and dispersing agent BYK-103 were added in sequence, and stirred for 1 hour until uniformly dispersed. Then, 28 parts by weight of high infrared emissivity filler, 10 parts by weight of 1250 mesh wet-process muscovite powder, 25 parts by weight of titanium dioxide R930, 2.8 parts by weight of graphene XF001W, and 15 parts by weight of ultrafine talc powder YM-T160 were added, and stirred for 0.5 hour until uniformly dispersed. Grind and disperse with a sand mill until the fineness is ≤30 μm, filter the material, and seal and package to obtain component A, the solid content of component A is 60.1%;

[0129] (2) In a container, 100 parts by weight of curing agent E402-90T, 0.2 parts by weight of molecular sieve AOS, and 2.8 parts by weight of adhesion promoter 1121 were sealed and stirred for 0.2 h, filtered, and sealed to obtain component B;

[0130] (3) Component A and component B are mixed in a weight ratio of 13:1 to obtain the high infrared emissivity topcoat.

[0131] Comparative Example 1

[0132] Compared with Example 1, the high-infrared emissivity filler in this comparative example was replaced with 1250-mesh wet ground muscovite powder.

[0133] Preparation of topcoat:

[0134] (1) In a paint-making tank, 45 parts by weight of butyl acetate, 100 parts by weight of organosilicon-modified fluorocarbon resin LS-8722, 1.8 parts by weight of anti-settling agent BYK-140, 4.8 parts by weight of ultraviolet absorber UV-234, 2.4 parts by weight of light stabilizer UV-292, 4.5 parts by weight of mildew-proofing agent MB-16, 3.0 parts by weight of defoaming agent BYK-065, 3.5 parts by weight of leveling agent FL3600, and 6.8 parts by weight of wetting and dispersing agent BYK-103 were added in sequence. After stirring for 1 h until evenly dispersed, 38 parts by weight of 1250-mesh wet ground muscovite, 25 parts by weight of titanium dioxide R930, 2.8 parts by weight of graphene XF001W, and 15 parts by weight of ultrafine talc powder YM-T160 were added, and then stirred for 0.5 h until evenly dispersed. It was ground and dispersed with a sand mill until the fineness was ≤ 30 μm, filtered and discharged, and then sealed and packaged to obtain Component A, and the solid content of Component A was 59.2%;

[0135] (2) In a container, 100 parts by weight of curing agent E402-90T, 0.2 parts by weight of molecular sieve AOS, and 2.8 parts by weight of adhesion promoter 1121 were stirred and sealed for 0.2 h, filtered and discharged, and then sealed and packaged to obtain Component B;

[0136] (3) The above-mentioned topcoat was obtained by mixing Component A and Component B in a weight ratio of 13:1.

[0137] Comparative Example 2

[0138] Preparation of cordierite filler:

[0139] 1) Using 100 parts by weight of 3000-mesh cordierite powder as the base material, it was heated to 1100 °C at a heating rate of 360 °C / h for high-temperature sintering, cooled, ground, and sieved to obtain cordierite powder.

[0140] Preparation of topcoat:

[0141] (1) In a paint-making tank, 38 parts by weight of ethyl acetate, 100 parts by weight of organosilicon-modified fluorocarbon resin LS-8722, 2 parts by weight of anti-settling agent MPA-1078, 5.2 parts by weight of ultraviolet light absorber Tinuvin329, 2.6 parts by weight of light stabilizer UV-123, 4.8 parts by weight of mildew-proof agent MB-16, 3.2 parts by weight of defoaming agent AFCONA-2020, 4.2 parts by weight of leveling agent FL3600, and 5.6 parts by weight of wetting and dispersing agent AFCONA-4015 are added in sequence. After stirring for 0.8 h until evenly dispersed, 25 parts by weight of the above cordierite filler, 8 parts by weight of 1250-mesh wet-process muscovite powder, 29 parts by weight of titanium dioxide BA01-0, 2.5 parts by weight of graphene XF001W, and 19 parts by weight of ultrafine talc powder YM-T160 are added, and stirring is continued for 0.3 h until evenly dispersed. It is ground and dispersed with a sand mill until the fineness is ≤ 30 μm, filtered and discharged, and then sealed and packaged to obtain Component A, and the solid content of Component A is 60.9%;

[0142] (2) In a container, 100 parts by weight of flexible curing agent E402-90T, 0.3 parts by weight of molecular sieve AOS, and 2.5 parts by weight of adhesion promoter 1121 are stirred with sealing for 0.2 h, filtered and discharged, and then sealed and packaged to obtain Component B;

[0143] (3) Component A and Component B are mixed at a weight ratio of 11.8:1 to obtain the topcoat.

[0144] Table 1. Main performance indexes of the topcoats prepared in Examples 1-6 and Comparative Examples 1-2

[0145]

[0146]

[0147] As can be seen from the above table, the coatings of Examples 1-6 all have a high infrared emissivity (≥0.8, preferably ≥0.9), and at the same time have good tensile strength (≥15 MPa) and elongation at break (≥80%), excellent heat resistance and water resistance, good salt spray resistance and artificial accelerated aging resistance, and the emissivity still remains at a high level (≥0.7, preferably ≥0.85) after environmental adaptability testing, and the emissivity has excellent stability. Among them, in Example 4, the transition metal oxide CoO was missing when preparing the high-emissivity filler, which led to a decrease in the emissivity of the coating, and CoO has the function of preventing metal surface corrosion and oxidation and prolonging the service life of the coating, so the weather resistance of the coating decreased, but the emissivity after weathering was still higher than that of the comparative example; in Example 5, the rare earth metal oxide CeO2 was missing when preparing the high-emissivity filler, and the emissivity of the coating decreased compared with that of Example 1, and CeO2 can improve the adhesion and durability of the coating, so the adhesion of the coating decreased slightly, and the emissivity after weathering decreased, but the emissivity after weathering was still higher than that of the comparative example; in Example 6, the rare earth metal oxide Yb2O3 was missing when preparing the high-emissivity filler, and the emissivity of the coating decreased significantly compared with that of Example 1, and the weather resistance decreased, but the emissivity after weathering was still higher than that of the comparative example. Compared with Examples 1-6, the infrared emissivity of Comparative Example 1 decreased sharply, indicating that the coating itself has a low infrared emissivity. Without adding the high-infrared emissivity filler of the present invention, it is impossible to make it have a high infrared emissivity, and the adhesion also decreased significantly; compared with Example 2, in Comparative Example 2, cordierite was not doped and modified by nano, resulting in the infrared emissivity not being effectively improved, and then the infrared emissivity of the coating dropped below 0.8. In Examples 1-6, the high-infrared emissivity filler was prepared by doping and modifying cordierite by nano, which effectively improved the infrared emissivity of the coating, fully demonstrating that the high-infrared emissivity filler has excellent high-emissivity performance.

[0148] In summary, the flexible weather-resistant high-infrared emissivity topcoat involved in the present invention exhibits excellent performance in multiple dimensions: in terms of infrared emission characteristics, the topcoat can stably maintain a high infrared emissivity; in terms of mechanical properties, it has good tensile strength and elongation at break, ensuring the integrity and stability of the structure in a complex stress environment; in terms of thermal properties, it shows good heat resistance and can maintain stable performance under high-temperature working conditions; in terms of corrosion resistance and environmental aging resistance, it has excellent salt spray resistance and weather resistance, and can effectively resist the erosion of various harsh environmental factors, ensuring the long-term reliable operation of the product.

Claims

1. A high-infrared emissivity filler, comprising oxides of at least one of Group VIII, Group VIIB, and Group IIB transition metals, cordierite, and rare earth metal oxides.

2. The high-infrared emissivity filler according to claim 1, characterized in that: the particle size of the cordierite is 500 - 6000 mesh, preferably 2000 - 5000 mesh; and / or, the rare earth metal oxide is selected from one or more of cerium oxide, ytterbium oxide, yttrium oxide, lanthanum oxide, and scandium oxide; preferably selected from one or more of cerium oxide, ytterbium oxide, and yttrium oxide; more preferably selected from one or more of cerium dioxide, ytterbium sesquioxide, and yttrium sesquioxide; further preferably a mixture of cerium dioxide, ytterbium sesquioxide, and yttrium sesquioxide; still more preferably, in the mixture of cerium dioxide, ytterbium sesquioxide, and yttrium sesquioxide, the mass ratio of cerium dioxide, ytterbium sesquioxide, and yttrium sesquioxide is 1:(0.2 - 5):(0.5 - 8), preferably 1:(0.5 - 2):(1.5 - 3); and / or, the Group VIII transition metal is selected from at least one of iron, cobalt, nickel, palladium, rhodium, and platinum, preferably at least one of iron and cobalt; and / or, the Group VIIB transition metal is selected from at least one of manganese, rhenium, and technetium, preferably manganese; and / or the Group IIB transition metal is selected from at least one of zinc, cadmium, and mercury, preferably zinc; preferably, the oxide of at least one of the Group VIII, Group VIIB, and Group IIB transition metals is at least one of iron oxide, manganese oxide, cobalt oxide, and zinc oxide; preferably at least one of iron sesquioxide, manganese dioxide, cobalt oxide, and zinc oxide; more preferably a mixture of iron sesquioxide, manganese dioxide, cobalt oxide, and zinc oxide; further preferably, in the mixture of iron sesquioxide, manganese dioxide, cobalt oxide, and zinc oxide, the mass ratio of iron sesquioxide, manganese dioxide, cobalt oxide, and zinc oxide is 1:(0.5 - 5):(0.1 - 4):(1 - 10), preferably 1:(1 - 2.5):(0.5 - 1.5):(2 - 4).

3. The high-infrared emissivity filler according to any one of claims 1 - 2, characterized in that: in the high-infrared emissivity filler, the mass ratio of the cordierite, the oxide of at least one of the Group VIII, Group VIIB, and Group IIB transition metals, and the rare earth metal oxide is 1:(0.35 - 0.70):(0.01 - 0.05), preferably 1:(0.40 - 0.60):(0.02 - 0.04).

4. A preparation method of a high-infrared emissivity filler according to any one of claims 1 - 3, comprising the steps of sintering the oxide of at least one of the Group VIII, Group VIIB, and Group IIB transition metals, and then adding components including cordierite and rare earth metal oxides and sintering again to obtain the high-infrared emissivity filler.

5. The preparation method according to claim 4, characterized in that: The conditions for sintering the oxide of at least one of Group VIII, Group VIIB, and Group IIB transition metals include: the heating rate is 100 - 500 °C / h, preferably 200 - 300 °C / h, heating to 900 - 1000 °C, and holding for 1 - 8 h; and / or, The conditions for adding components including cordierite and rare earth metal oxides and sintering again include: the heating rate is 100 - 500 °C / h, preferably 300 - 400 °C / h, heating to 1060 - 1200 °C, and holding for 1 - 4 h.

6. A high-infrared emissivity topcoat, comprising the high-infrared emissivity filler described in any one of claims 1 - 3 or the high-infrared emissivity filler prepared by the preparation method described in any one of claims 4 - 5.

7. The high-infrared emissivity topcoat according to claim 6, wherein: The high-infrared emissivity topcoat comprises component A and component B; Component A includes fluorocarbon resin, high-infrared emissivity filler, muscovite powder, titanium dioxide, graphene, ultraviolet light absorber, light stabilizer, mildew-proof agent, and solvent; Based on 100 parts by weight of the fluorocarbon resin, each component in component A is: The high-infrared emissivity filler is 10 - 40 parts by weight; preferably 15 - 32 parts by weight; The muscovite powder is 5 - 15 parts by weight; preferably 8 - 12 parts by weight; The titanium dioxide is 20 - 35 parts by weight; preferably 24 - 32 parts by weight; The graphene is 1 - 8 parts by weight; preferably 2 - 6 parts by weight; The ultraviolet light absorber is 2 - 8 parts by weight; preferably 2 - 6 parts by weight; The light stabilizer is 1 - 4 parts by weight; preferably 1 - 3 parts by weight; The mildew-proof agent is 2 - 8 parts by weight; preferably 3 - 6 parts by weight; The solvent is 20 - 80 parts by weight; preferably 20 - 60 parts by weight; Component B includes molecular sieve, curing agent, and adhesion promoter; Based on 100 parts by weight of the curing agent, each component in component B is: The molecular sieve is 0.2 - 1.0 parts by weight; preferably 0.2 - 0.4 parts by weight; The adhesion promoter is 1 - 6 parts by weight; preferably 2 - 5 parts by weight; The mass ratio range of component A to component B is (8 - 15):1, preferably (10 - 13):

1.

8. The high-infrared emissivity topcoat according to claim 7, wherein: The fluorocarbon resin is selected from at least one of organosilicon-modified fluorocarbon resins; and / or, The muscovite powder is wet-processed muscovite powder, preferably the particle size of the wet-processed muscovite powder is 1000 - 1250 mesh; and / or, The ultraviolet light absorber is selected from at least one of benzotriazole ultraviolet light absorbers; and / or, The light stabilizer is selected from at least one of hindered amine light stabilizers; and / or, The mildew-proof agent is selected from at least one of benzimidazole mildew-proof agents; and / or, The solvent is selected from at least one of butyl acetate, ethyl acetate, and propylene glycol methyl ether acetate; and / or, The curing agent is selected from at least one of isocyanate curing agents.

9. A preparation method of a high-infrared emissivity topcoat as described in any one of claims 7-8, comprising: First, component A and component B are respectively mixed according to the dosage of each component, and then component A and component B are mixed according to the dosage ratio to obtain the high-infrared emissivity topcoat.

10. Application of a high-infrared emissivity filler as described in any one of claims 1-3, or a high-infrared emissivity filler prepared by the preparation method as described in any one of claims 4-5, or a high-infrared emissivity topcoat as described in any one of claims 6-8, or a high-infrared emissivity topcoat prepared by the preparation method as described in claim 9 in the outer skin of an aircraft.

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