A thermal insulation stealth multifunctional coating and its preparation method and application

Abstract

The present invention discloses a thermal insulation stealth multifunctional coating and its preparation method and application, which belongs to the technical field of electromagnetic shielding coatings. The thermal insulation stealth multifunctional coating includes a metal-plated substance A, an epoxy resin, and an epoxy resin curing agent; the metal is a mixture of Ni and Cu; and the substance A is tantalate and / or YSZ. The present invention adopts a chemical plating method to prepare the substance A plated with Ni and Cu metals. The heterogeneous interface interaction between the nano-scale Ni and Cu on its surface and the tantalate and / or YSZ shows excellent heat dissipation, heat insulation, and electromagnetic wave shielding performance, low cost, and can enable the aircraft to operate normally at a temperature of 1200 degrees. In addition, the preparation method of the thermal insulation stealth multifunctional coating of the present invention has the advantages of low synthesis temperature, short reaction time, simple process, and easy dispersion.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic shielding coating technology, specifically relating to a heat-insulating and stealthy multifunctional coating, its preparation method, and its application. Background Technology

[0002] Electromagnetic waves have wide applications in both military and civilian fields; however, various electromagnetic pulse bombs and electronic warfare weapon systems pose certain threats to military communications and national defense security. Currently, stealth technology is increasingly crucial in the military field, becoming an important high-tech advancement for major military powers to enhance the survivability and breakthrough capabilities of key military equipment on the battlefield. On the modern battlefield, the diversified application of detection and guidance technologies enables advanced military reconnaissance equipment across multiple bands, such as radar, infrared, and visible light, to operate in tandem, achieving a high degree of integration of multi-source detection information, thereby enabling precise location and rapid destruction of targets with superior accuracy. In particular, multi-mode composite guidance methods combining optical reconnaissance, passive infrared detection, and active radar detection are widely used in precision-guided asymmetric lethal strike weapons, such as missiles. However, with the rapid development of detection and guidance technologies, traditional stealth materials face new challenges. Existing stealth materials are insufficient to meet the requirements of both heat insulation and radar stealth. Besides the military field, stealth technology also has wide applications in the civilian sector. Electromagnetic pulse bombs and electronic warfare weapon systems pose a threat to military communications and national defense security; therefore, internal aircraft instruments require the protection of shielding coatings.

[0003] Currently, carbon fiber composites are widely used in aircraft due to their excellent mechanical and thermodynamic properties. With technological advancements, improving the performance of carbon fiber composites is a key focus to meet the demands of various extreme environments encountered by aircraft, and thermal insulation and stealth are crucial properties of coatings. Therefore, developing novel coatings with both thermal insulation and stealth capabilities is urgently needed to improve the performance of carbon fiber composites.

[0004] Furthermore, when an aircraft accelerates, it experiences accumulated stress, friction, and heat upon high-speed contact with the air. If the temperature is too high, the aircraft's shielding coating can often be severely damaged. Therefore, thermal insulation performance is crucial for aircraft protection. Excellent thermal insulation is a fundamental requirement for shielding coatings. Current research suggests that using functional layers in aircraft coatings can achieve certain performance characteristics, and layered structures can meet various performance requirements. However, this often results in excessive material preparation during aircraft production to achieve the desired effect under extreme conditions. Therefore, there is an urgent need for a coating that can simultaneously provide thermal insulation and shielding properties to reduce the complexity of aircraft shell manufacturing processes and improve safety.

[0005] Most aircraft coatings currently focus on either heat insulation or stealth performance, and research on coatings that can simultaneously achieve both heat insulation and stealth performance is relatively scarce. Summary of the Invention

[0006] To address the shortcomings of the existing technologies, this invention provides a heat-insulating and stealth-integrated multifunctional coating, its preparation method, and its application. The heat-insulating and stealth-integrated multifunctional coating of this invention possesses a combined effect of heat insulation and electromagnetic wave shielding, effectively solving the problem of heat insulation and stealth multifunctionality.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] A heat-insulating and stealth multifunctional coating includes a metal-plated substance A, an epoxy resin, and an epoxy resin curing agent; the metal is a mixture of Ni and Cu; and substance A is a tantalate and / or YSZ.

[0009] In a preferred embodiment of the present invention, the mass ratio of the metal plating substance A, epoxy resin, and epoxy resin curing agent is 1 to 4:5:5; when substance A is tantalate and YSZ, the mass ratio of tantalate to YSZ is arbitrary.

[0010] In a preferred embodiment of the present invention, the metal-plated material A is a hollow sphere with a particle size of 1–20 μm. The smaller particle size contributes to a smooth and aesthetically pleasing coating surface. The Ni and Cu on the surface of the metal-plated material A are at the nanoscale, and the heterogeneous interface interaction between material A and the metallic Ni and Cu provides excellent electromagnetic wave shielding and thermal insulation capabilities.

[0011] This invention also claims a method for preparing the heat-insulating and stealth multifunctional coating, comprising the following steps:

[0012] (1) Place substance A in a plating solution for chemical plating, add alkali or acid to maintain the pH of the plating solution at 3.5-7.5 during the chemical plating process, and then separate, wash and dry to obtain substance A with plating metal;

[0013] (2) Mix metal-plated substance A, epoxy resin and epoxy resin curing agent to obtain a heat-insulating and stealth multifunctional coating.

[0014] The plating solution is a mixed aqueous solution of nickel sulfate, copper sulfate, copper citrate, sodium hypophosphite, potassium iodide, sodium citrate, boric acid, NaF, citric acid, shielding agent, dispersant, activator and surfactant.

[0015] In a preferred embodiment of the present invention, the mass concentration ratio of nickel sulfate, copper sulfate, copper citrate, sodium hypophosphite, potassium iodide, sodium citrate, boric acid, NaF, citric acid, shielding agent, dispersant, activator, and surfactant is 10–30: 10–30: 20–60: 10–40: 0.001–0.1: 20–60: 0.001–0.1: 0.001–0.1: 0.01–0.1: 0.005–0.05: 0.005–0.05: 0.005–0.05: 0.005–0.05.

[0016] In a preferred embodiment of the present invention, the mass-to-volume ratio of substance A to plating solution is 1:10 to 1:30 g / mL.

[0017] In a preferred embodiment of the present invention, the alkali is ammonia and the acid is sulfuric acid.

[0018] As a preferred embodiment of the present invention, in step (1), the chemical plating time is 30 to 120 minutes, the temperature is 80 to 84°C, and the stirring speed during chemical plating is 400 to 500 r / min.

[0019] In a preferred embodiment of the present invention, the drying temperature in step (1) is 70°C.

[0020] As a preferred embodiment of the present invention, in step (2), when the metal plating substance A, epoxy resin and epoxy resin curing agent are mixed, the stirring rate is 100-600 r / min and the stirring time is 20-120 min.

[0021] The application of the heat-insulating and stealth multifunctional coating described in this invention on heat-insulating and electromagnetic wave-shielding carbon fiber braided bodies.

[0022] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention uses a chemical plating method to prepare a metal-plated substance A. The heterogeneous interface between the nano-Ni and Cu on the surface of the metal-plated substance A and tantalates and / or YSZ exhibits excellent heat dissipation, heat insulation, and electromagnetic wave shielding performance. It is low in cost and allows aircraft to operate normally at temperatures up to 1200 degrees Celsius. Furthermore, the method for preparing the heat-insulating, stealth, multifunctional coating described in this invention has advantages such as low synthesis temperature, short reaction time, simple process, and easy dispersion. Attached Figure Description

[0023] Figure 1 A schematic diagram of a coating prepared for a heat-insulating and stealth multifunctional coating.

[0024] Figure 2 The image shows the SEM image of the heat-insulating and stealth multifunctional coating prepared in Example 1.

[0025] Figure 3The image shows the SEM image of the heat-insulating stealth coating prepared in Example 1.

[0026] Figure 4 The thermal insulation curves are those of the thermal insulation stealth coating and carbon fiber braid obtained in Examples 1-5 of this invention. Detailed Implementation

[0027] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0028] The shielding agent used in the examples and comparative examples was ferromolybdenum, the dispersant was phosphoric acid, the activator was ruthenium trichloride, and the surfactant was polyethylene glycol.

[0029] Example 1

[0030] A method for preparing a heat-insulating and stealth multifunctional coating includes the following steps:

[0031] (1) 10g of nickel sulfate, 10g of copper sulfate, 20g of copper citrate, 10g of sodium hypophosphite, 0.1mg of potassium iodide, 20g of sodium citrate, 0.001g of boric acid, 0.1mg of NaF, 0.01mg of citric acid, 0.01mg of shielding agent, 0.01mg of dispersant, 0.01mg of activator, and 0.01mg of surfactant are added to 300mL of water and placed on a magnetic stirrer. The stirring speed is 400r / min and the time is 40min to fully dissolve the nickel sulfate, copper sulfate, copper citrate, sodium hypophosphite, potassium iodide, sodium citrate, boric acid, NaF, citric acid, shielding agent, dispersant, activator, and surfactant to obtain the plating solution.

[0032] (2) Weigh 30g of hollow yttrium tantalate spheres with a particle size of 10μm and wash them. Filter the washed hollow spheres and vacuum dry them. After drying, put them into 300mL of the plating solution obtained in step (1) and stir them magnetically at a temperature of 84℃, a speed of 400r / min, and a time of 30min. Add alkali or acid to maintain the pH of the plating solution at 5.5 during the chemical plating process. After stirring, separate the plating solution from the yttrium tantalate plating Ni and Cu. Add deionized water to ultrasonically clean the yttrium tantalate plating Ni and Cu to avoid plating solution residue. After cleaning, separate the hollow spheres and dry them at 70℃ for 24h.

[0033] (3) Weigh the dried Ni and Cu plating yttrium tantalate, epoxy resin and epoxy resin curing agent into a beaker at a mass ratio of 1:5:5, and stir thoroughly at room temperature for 60 min at a stirring rate of 600 r / min to obtain a heat-insulating and stealth multifunctional coating.

[0034] A method for preparing a carbon fiber braided thermal insulation stealth coating includes:

[0035] (1) First remove the stains from the carbon fiber braid with acetone, then sand the carbon fiber braid with sandpaper to roughen the surface.

[0036] (2) The heat-insulating and stealth multifunctional coating prepared in Example 1 was uniformly applied to the carbon fiber braid and dried at room temperature for 48 hours to obtain the heat-insulating and stealth coating with a thickness of 70±5μm.

[0037] according to Figure 2 and Figure 3 It can be seen that nano-sized Ni and Cu are uniformly distributed on the surface of yttrium tantalate.

[0038] according to Figure 4 It can be seen that the heat-insulating and stealth multi-functional coating has a smooth appearance and few bubbles.

[0039] Example 2

[0040] The only difference between the preparation method of the heat-insulating and stealth multifunctional coating and Example 1 is that in step (2), the mass of the yttrium tantalate hollow spheres with a particle size of 10 μm is 10 g.

[0041] The only difference between the preparation method of the carbon fiber braided heat insulation and stealth coating and Example 1 is that in step (2), the heat insulation and stealth multifunctional coating prepared in Example 2 is evenly applied to the carbon fiber braided body.

[0042] Example 3

[0043] The only difference between the preparation method of the heat-insulating and stealth multifunctional coating and Example 1 is that in step (2), the mass of the yttrium tantalate hollow spheres with a particle size of 10 μm is 15 g.

[0044] The only difference between the preparation method of the carbon fiber braided heat insulation and stealth coating and Example 1 is that in step (2), the heat insulation and stealth multifunctional coating prepared in Example 3 is evenly applied to the carbon fiber braided body.

[0045] Example 4

[0046] The only difference between the preparation method of the heat-insulating and stealth multifunctional coating and Example 1 is that in step (2), the mass of the yttrium tantalate hollow spheres with a particle size of 10 μm is 20 g.

[0047] The only difference between the preparation method of the carbon fiber braided heat insulation and stealth coating and Example 1 is that in step (2), the heat insulation and stealth multifunctional coating prepared in Example 4 is evenly applied to the carbon fiber braided body.

[0048] Example 5

[0049] The only difference between the preparation method of the heat-insulating and stealth multifunctional coating and Example 1 is that in step (2), the mass of the yttrium tantalate hollow spheres with a particle size of 10 μm is 25 g.

[0050] The only difference between the preparation method of the carbon fiber braided heat insulation and stealth coating and Example 1 is that in step (2), the heat insulation and stealth multifunctional coating prepared in Example 5 is evenly applied to the carbon fiber braided body.

[0051] Example 6

[0052] A method for preparing a heat-insulating and stealth multifunctional coating includes the following steps:

[0053] (1) Weigh 30g of nickel sulfate, 30g of copper sulfate, 60g of copper citrate, 40g of sodium hypophosphite, 0.1mg of potassium iodide, 60g of sodium citrate, 0.1g of boric acid, 0.001mg of NaF, 0.1mg of citric acid, 0.005mg of shielding agent, 0.005mg of dispersant, 0.005mg of activator, and 0.005mg of surfactant and add them to 300mL of water. Place the mixture on a magnetic stirrer and stir at 500r / min for 60min to fully dissolve the nickel sulfate, copper sulfate, copper citrate, sodium hypophosphite, potassium iodide, sodium citrate, boric acid, NaF, citric acid, shielding agent, dispersant, activator, and surfactant to obtain the plating solution.

[0054] (2) Weigh 30g of YSZ hollow spheres with a particle size of 1μm and wash them. Filter the washed hollow spheres and vacuum dry them. After drying, put them into 300mL of the plating solution obtained in step (1) and stir them magnetically at a temperature of 80℃, a speed of 500r / min, and a time of 120min. Add alkali or acid to maintain the pH of the plating solution at 3.5 during the chemical plating process. After stirring, separate the plating solution from the YSZ plating Ni and Cu. Add deionized water to ultrasonically clean the YSZ plating Ni and Cu to avoid plating solution residue. After cleaning, separate the hollow spheres and dry them at 70℃ for 36h.

[0055] (3) The dried Ni and Cu plated YSZ hollow spheres, epoxy resin and epoxy resin curing agent were weighed into a beaker at a mass ratio of 4:5:5 and stirred thoroughly at room temperature for 60 minutes at a speed of 100 r / min to obtain a heat-insulating and stealth multifunctional coating.

[0056] A method for preparing a carbon fiber braided thermal insulation stealth coating includes:

[0057] (1) First remove the stains from the carbon fiber braid with acetone, then sand the carbon fiber braid with sandpaper to roughen the surface.

[0058] (2) The heat-insulating and stealth multifunctional coating prepared in Example 6 was uniformly applied to the carbon fiber braid and dried at room temperature for 120 hours to obtain the heat-insulating and stealth coating with a thickness of 70±5μm.

[0059] Example 7

[0060] A method for preparing a heat-insulating and stealth multifunctional coating includes the following steps:

[0061] (1) 10g of nickel sulfate, 10g of copper sulfate, 20g of copper citrate, 10g of sodium hypophosphite, 0.1mg of potassium iodide, 20g of sodium citrate, 0.001g of boric acid, 0.1mg of NaF, 0.01mg of citric acid, 0.01mg of shielding agent, 0.01mg of dispersant, 0.01mg of activator, and 0.01mg of surfactant are added to 300mL of water and placed on a magnetic stirrer. The stirring speed is 400r / min and the time is 40min to fully dissolve the nickel sulfate, copper sulfate, copper citrate, sodium hypophosphite, potassium iodide, sodium citrate, boric acid, NaF, citric acid, shielding agent, dispersant, activator, and surfactant to obtain the plating solution.

[0062] (3) Weigh 20g of hollow yttrium tantalate spheres with a particle size of 20μm and 10g of hollow YSZ spheres with a particle size of 20μm and wash them. Filter the washed hollow spheres and vacuum dry them. After drying, put them into 300mL of the plating solution obtained in step (1) and perform magnetic stirring at a temperature of 84℃, a rotation speed of 400r / min, and a time of 30min. Add alkali or acid to maintain the pH of the plating solution at 5.5 during the chemical plating process. After stirring, separate the plating solution from the yttrium tantalate and YSZ for Ni and Cu plating. Add deionized water to ultrasonically clean the yttrium tantalate and YSZ for Ni and Cu plating to avoid plating solution residue. After cleaning, separate the hollow spheres and dry them at 70℃ for 24h.

[0063] (3) Weigh the dried Ni and Cu plating yttrium tantalate and YSZ, epoxy resin and epoxy resin curing agent into a beaker at a mass ratio of 1:5:5, and stir thoroughly at room temperature for 60 minutes at a stirring rate of 600 r / min to obtain a heat-insulating and stealth multifunctional coating.

[0064] A method for preparing a carbon fiber braided thermal insulation stealth coating includes:

[0065] (1) First remove the stains from the carbon fiber braid with acetone, then sand the carbon fiber braid with sandpaper to roughen the surface.

[0066] (2) The heat-insulating and stealth multifunctional coating prepared in Example 7 was uniformly applied to the carbon fiber braid and dried at room temperature for 48 hours to obtain the heat-insulating and stealth coating with a thickness of 70±5μm.

[0067] Comparative Example 1

[0068] A method for preparing a heat-insulating and stealth multifunctional coating includes the following steps:

[0069] (1) Weigh 30g of hollow yttrium tantalate spheres with a particle size of 1-20μm and nano-sized metallic nickel and copper, wash them, filter the washed hollow spheres, and vacuum dry them.

[0070] (3) Weigh the dried yttrium tantalate hollow spheres, nano-sized metallic nickel and copper, epoxy resin and epoxy resin curing agent into a beaker at a mass ratio of 1:0.2:0.2:5:5, and stir thoroughly at room temperature for 60 minutes to obtain a heat-insulating and stealth multifunctional coating.

[0071] A method for preparing a carbon fiber braided thermal insulation stealth coating includes:

[0072] (1) First remove the stains from the carbon fiber braid with acetone, then sand the carbon fiber braid with sandpaper to roughen the surface.

[0073] (2) The heat-insulating and stealth multifunctional coating prepared in Comparative Example 1 was uniformly applied to the carbon fiber braid and dried at room temperature for 48 hours to obtain the heat-insulating and stealth coating with a thickness of 70±5μm.

[0074] Comparative Example 2

[0075] A method for preparing the aforementioned heat-insulating and stealth multifunctional coating includes the following steps:

[0076] (1) Nano-sized metallic nickel and copper, epoxy resin and epoxy resin curing agent were weighed into a beaker at a mass ratio of 0.2:0.2:5:5 and stirred thoroughly at room temperature for 60 minutes to obtain a heat-insulating and stealth multifunctional coating.

[0077] A method for preparing a carbon fiber braided thermal insulation stealth coating includes:

[0078] (1) First remove the stains from the carbon fiber braid with acetone, then sand the carbon fiber braid with sandpaper to roughen the surface.

[0079] (2) The heat-insulating stealth multifunctional coating prepared in Comparative Example 2 was uniformly applied to the carbon fiber braid and dried at room temperature for 48 hours to obtain the heat-insulating stealth coating with a thickness of 70±5μm.

[0080] Comparative Example 3

[0081] A method for preparing a heat-insulating and stealth multifunctional coating includes the following steps:

[0082] (1) Weigh 30g of hollow yttrium tantalate spheres with a particle size of 1-20μm and wash them. Filter the washed hollow spheres and dry them under vacuum.

[0083] (3) Place the dried yttrium tantalate hollow spheres, epoxy resin and epoxy resin curing agent into a beaker. The mass ratio of yttrium tantalate hollow spheres, epoxy resin and epoxy resin curing agent is 1:5:5. Stir thoroughly at room temperature for 60 minutes to obtain a heat-insulating and stealth multifunctional coating.

[0084] A method for preparing a carbon fiber braided thermal insulation stealth coating includes:

[0085] (1) First remove the stains from the carbon fiber braid with acetone, then sand the carbon fiber braid with sandpaper to roughen the surface.

[0086] (2) The heat-insulating stealth multifunctional coating prepared in Comparative Example 3 was uniformly applied to the carbon fiber braid and dried at room temperature for 48 hours to obtain the heat-insulating stealth coating with a thickness of 70±5μm.

[0087] Comparative Example 4

[0088] A method for preparing a heat-insulating and stealth multifunctional coating includes the following steps:

[0089] Epoxy resin and epoxy resin curing agent were weighed into a beaker at a mass ratio of 5:5 and stirred thoroughly at room temperature for 60 minutes to obtain a heat-insulating and stealth multifunctional coating.

[0090] A method for preparing a carbon fiber braided thermal insulation stealth coating includes:

[0091] (1) First remove the stains from the carbon fiber braid with acetone, then sand the carbon fiber braid with sandpaper to roughen the surface.

[0092] (2) The heat-insulating stealth multifunctional coating prepared in Comparative Example 4 was uniformly applied to the carbon fiber braid and dried at room temperature for 48 hours to obtain the heat-insulating stealth coating with a thickness of 70±5μm.

[0093] Comparative Example 5

[0094] A method for preparing a heat-insulating and stealth multifunctional coating includes the following steps:

[0095] (1) Add 10g of nickel sulfate, 10g of sodium hypophosphite, 0.1mg of potassium iodide, 20g of sodium citrate, 0.001g of boric acid, 0.1mg of NaF, 0.01mg of citric acid, 0.01mg of shielding agent, 0.01mg of dispersant, 0.01mg of activator, and 0.01mg of surfactant to 300mL of water. Place the mixture on a magnetic stirrer and stir at 400r / min for 40min to fully dissolve the nickel sulfate, sodium hypophosphite, potassium iodide, sodium citrate, boric acid, NaF, citric acid, shielding agent, dispersant, activator, and surfactant to obtain the plating solution.

[0096] (4) Weigh 30g of hollow yttrium tantalate spheres with a particle size of 1-20μm and wash them. Filter the washed hollow spheres and vacuum dry them. After drying, put them into 300mL of the plating solution obtained in step (1) and stir them magnetically at a temperature of 84℃, a speed of 400r / min, and a time of 30min. Add alkali or acid to maintain the pH of the plating solution at 5.5 during the chemical plating process. After stirring, separate the plating solution and the yttrium tantalate plating Ni. Add deionized water to ultrasonically clean the yttrium tantalate plating Ni to avoid plating solution residue. After cleaning, separate the hollow spheres and dry them at 70℃ for 24h.

[0097] (3) Weigh the dried Ni-plated yttrium tantalate, epoxy resin and epoxy resin curing agent into a beaker at a mass ratio of 1:5:5, and stir thoroughly at room temperature for 60 minutes at a stirring rate of 600 r / min to obtain a heat-insulating and stealth multifunctional coating.

[0098] A method for preparing a carbon fiber braided thermal insulation stealth coating includes:

[0099] (1) First remove the stains from the carbon fiber braid with acetone, then sand the carbon fiber braid with sandpaper to roughen the surface.

[0100] (2) The heat-insulating stealth multifunctional coating prepared in Comparative Example 5 was uniformly applied to the carbon fiber braid and dried at room temperature for 48 hours to obtain the heat-insulating stealth coating with a thickness of 70±5μm.

[0101] Comparative Example 6

[0102] A method for preparing a heat-insulating and stealth multifunctional coating includes the following steps:

[0103] (1) 10g of copper sulfate, 20g of copper citrate, 10g of sodium hypophosphite, 0.1mg of potassium iodide, 20g of sodium citrate, 0.001g of boric acid, 0.1mg of NaF, 0.01mg of citric acid, 0.01mg of shielding agent, 0.01mg of dispersant, 0.01mg of activator, and 0.01mg of surfactant are added to 300mL of water and placed on a magnetic stirrer. The stirring speed is 400r / min and the time is 40min to fully dissolve the copper sulfate, copper citrate, sodium hypophosphite, potassium iodide, sodium citrate, boric acid, NaF, citric acid, shielding agent, dispersant, activator, and surfactant to obtain the plating solution.

[0104] (5) Weigh 30g of hollow yttrium tantalate spheres with a particle size of 1-20μm and wash them. Filter the washed hollow spheres and vacuum dry them. After drying, put them into 300mL of the plating solution obtained in step (1) and stir them magnetically at a temperature of 84℃, a speed of 400r / min, and a time of 30min. Add alkali or acid to maintain the pH of the plating solution at 5.5 during the chemical plating process. After stirring, separate the plating solution and the yttrium tantalate plating Cu. Add deionized water to ultrasonically clean the yttrium tantalate plating Cu to avoid plating solution residue. After cleaning, separate the hollow spheres and dry them at 70℃ for 24h.

[0105] (3) Weigh the dried Cu-plated yttrium tantalate, epoxy resin and epoxy resin curing agent into a beaker at a mass ratio of 1:5:5, and stir thoroughly at room temperature for 60 minutes at a stirring rate of 600 r / min to obtain a heat-insulating and stealth multifunctional coating.

[0106] A method for preparing a carbon fiber braided thermal insulation stealth coating includes:

[0107] (1) First remove the stains from the carbon fiber braid with acetone, then sand the carbon fiber braid with sandpaper to roughen the surface.

[0108] (2) The heat-insulating stealth multifunctional coating prepared in Comparative Example 6 was uniformly applied to the carbon fiber braid and dried at room temperature for 48 hours to obtain the heat-insulating stealth coating with a thickness of 70±5μm.

[0109] The thermal conductivity and electromagnetic shielding efficiency of Examples 1-7 and Comparative Examples 1-6 are shown in Table 1.

[0110] Table 1. Thermal conductivity and electromagnetic shielding efficiency of the embodiments and comparative examples.

[0111]

[0112] According to Table 1 and Figure 4The thermal conductivity and electromagnetic shielding efficiency data of Examples 1-7 and Comparative Examples 1-6 show that the thermal insulation and shielding effects of the coatings in Examples 1-7 are higher than those in Comparative Examples 1-6. According to Examples 1 and Comparative Examples 1-4, this invention, on the one hand, precisely controls the purity and structure of the materials through chemical plating, forming a uniform nickel and Cu layer of a specific thickness on the surface of tantalates and / or YSZ. On the other hand, through chemical plating, Ni and Cu are more tightly bonded to the surface of tantalates and / or YSZ. This tight bonding promotes the formation of new chemical bonds between Ni and Cu and tantalates and / or YSZ, enhancing the physicochemical forces between the materials, thereby improving the thermal insulation and shielding performance of the coating. This avoids the problem of directly mixing metallic Ni and Cu with hollow tantalate and / or YSZ spheres, which would lead to impurities or defects inside the material and significantly reduce the performance of the sub-coating.

[0113] As demonstrated in Example 1 and Comparative Examples 5-6, electroless plating of nickel (Ni) and copper (Cu) composite materials on tantalate and / or YSZ surfaces can enhance electromagnetic wave shielding performance. The complementary properties of Ni and Cu provide strong technical support for efficient electromagnetic wave shielding. This composite material has broad application potential in electronic equipment, aerospace, military, and other fields requiring efficient electromagnetic shielding.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A heat-insulating and stealth multifunctional coating, characterized in that, The product includes a metal plating substance A, epoxy resin, and epoxy resin curing agent; the mass ratio of metal plating substance A, epoxy resin, and epoxy resin curing agent is 1 to 4:5:5; the metals are Ni and Cu; substance A is yttrium tantalate hollow spheres and / or YSZ hollow spheres, and the particle size of substance A is 1-20 μm. The preparation method of the metal plating substance A includes the following steps: placing substance A in a plating solution for chemical plating, adding alkali or acid to maintain the pH of the plating solution at 3.5 to 7.5 during the chemical plating process, and then separating, washing, and drying to obtain the metal plating substance A; The plating solution is a mixed aqueous solution of nickel sulfate, copper sulfate, copper citrate, sodium hypophosphite, potassium iodide, sodium citrate, boric acid, NaF, citric acid, shielding agent, dispersant, activator and surfactant.

2. The preparation method of the heat-insulating and stealth multifunctional coating according to claim 1, characterized in that, The steps include: A heat-insulating and stealth multifunctional coating is obtained by mixing metal-plating substance A, epoxy resin and epoxy resin curing agent.

3. The preparation method of the heat-insulating and stealth multifunctional coating as described in claim 2, characterized in that, The mass concentration ratio of the nickel sulfate, copper sulfate, copper citrate, sodium hypophosphite, potassium iodide, sodium citrate, boric acid, NaF, citric acid, shielding agent, dispersant, activator, and surfactant is 10–30: 10–30: 20–60: 10–40: 0.001–0.1: 20–60: 0.001–0.1: 0.001–0.1: 0.01–0.1: 0.005–0.05: 0.005–0.05: 0.005–0.05: 0.005–0.

05.

4. The preparation method of the heat-insulating and stealth multifunctional coating as described in claim 2, characterized in that, The mass-to-volume ratio of substance A to the plating solution is 1:10 to 1:30 g / mL.

5. The preparation method of the heat-insulating and stealth multifunctional coating as described in claim 2, characterized in that, The electroless plating time is 30-120 min, the temperature is 80-84℃, and the stirring speed during electroless plating is 400-500 r / min.

6. The preparation method of the heat-insulating and stealth multifunctional coating as described in claim 2, characterized in that, When the metal plating substance A, epoxy resin, and epoxy resin curing agent are mixed, the stirring rate is 100-600 r / min and the stirring time is 20-120 min.

7. The application of the heat-insulating and stealth multifunctional coating prepared by the method of the heat-insulating and stealth multifunctional coating according to claim 1 or any one of claims 2-6 on a heat-insulating and electromagnetic wave shielding carbon fiber braid.

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