Infrared stealth coating material and preparation method thereof

Abstract

The present invention provides an infrared stealth coating material and a preparation method thereof. The infrared stealth coating is composed of 10% to 25% aluminum powder, 5% to 20% interface-regulated MXene, 18% to 29% adhesive, 1% to 2% orienting agent, and 40% to 50% solvent by mass; the interface-regulated MXene is ‑OH-terminated MXene or hydrophobic MXene. The infrared stealth coating material partially replaces aluminum powder with MXene, ensuring that the coating has low infrared emissivity while having high visible light absorptivity and corrosion resistance, solving the problem of aluminum powder's strong reflectivity to visible light.

Description

Technical Field

[0001] The present invention relates to the field of infrared stealth, and in particular to an infrared stealth coating material based on aluminum powder and MXene and a preparation method thereof. Background Art

[0002] According to infrared physics, the infrared radiation energy of an object conforms to Stefan Boltzmann's law: M = εσT 4 (Where: M is the total radiation energy of the object; ε is the infrared emissivity; σ is the Boltzmann constant; T is the surface temperature of the object.) Therefore, the radiation capacity of an object is determined by the infrared emissivity and the surface temperature of the object. Therefore, reducing the infrared emissivity of the object surface and controlling the surface temperature are effective ways to achieve infrared stealth.

[0003] At present, there have been a large number of reports on infrared stealth materials, mainly focusing on reducing infrared emissivity or controlling the temperature of objects through phase change and thermal insulation materials. However, the following problems still exist: (1) Although metal films or coatings have low infrared emissivity, they are easy to corrode, have high density and are difficult to process; (2) The operating temperature of phase change materials is relatively low; (3) Thermal insulation materials such as aerogels or foams are relatively thick; (4) The preparation process of metamaterials such as photonic crystals is complex and costly.

[0004] Aluminum powder has the highest cost-effectiveness among many metal materials and is the most commonly used inorganic low infrared emissivity material with a very low infrared emissivity in the infrared band. However, it is easily oxidized during use, and the infrared emissivity will increase after oxidation; and it has a strong reflective ability for visible light. Therefore, it is urgent to improve and innovate on the basis of the original infrared stealth coating materials and preparation methods to provide solutions to the above problems. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides an infrared stealth coating material and a preparation method thereof. The infrared stealth coating material uses MXene to partially replace aluminum powder, thereby ensuring that the coating has low infrared emissivity while having high visible light absorption rate and corrosion resistance, thereby solving the problem of strong reflectivity of aluminum powder to visible light.

[0006] The present invention is achieved through the following technical solutions:

[0007] An infrared stealth coating material, which is composed of 10% to 25% aluminum powder, 5% to 20% interface-regulated MXene, 18% to 29% adhesive, 1% to 2% directional agent, and 40% to 50% solvent, based on mass percentage; the interface-regulated MXene is -OH-terminated MXene or hydrophobic MXene.

[0008] Preferably, the -OH terminal MXene is prepared by the following method:

[0009] MXene is treated with LiOH, NaOH or KOH solution to obtain interface-regulated -OH-terminated MXene.

[0010] Preferably, the hydrophobic MXene is prepared by the following method:

[0011] MXene is reacted with alkoxysilane to obtain hydrophobic MXene.

[0012] Preferably, the MXene is Ti 3 C 2 T X .

[0013] Preferably, the aluminum powder is flaky aluminum powder with a particle size of 20 to 30 μm; and the solvent is one of water and toluene.

[0014] Preferably, the adhesive is one of epoxy resin, alkyd resin and waterborne polyurethane.

[0015] Preferably, the orienting agent is one of polyamide wax, lithium magnesium silicate and cellulose acetate butyrate.

[0016] The method for preparing the infrared stealth coating material comprises the following steps:

[0017] Step 1, interface regulation of MXene to obtain interface-regulated MXene;

[0018] Step 2: Add aluminum powder, interface-regulated MXene, adhesive and directional agent to the solvent in sequence and stir to obtain the infrared stealth coating material.

[0019] Preferably, stirring is carried out at 50-70° C. and a stirring speed of 800-1000 r / min.

[0020] An infrared stealth object, the surface of which is coated with the infrared stealth coating material according to any one of claims 1 to 7.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The infrared stealth coating material of the present invention uses aluminum powder, MXene, adhesive and directional agent as main raw materials, and uses MXene with both low infrared emissivity and high visible light absorptivity to partially replace aluminum powder, so as to solve the problem that aluminum powder has strong reflectivity to visible light. At the same time, MXene has good electrical conductivity and electrochemical stability, and can form a protective electrochemical interface with aluminum powder to prevent the reaction of electrons and ions on the interface, protect aluminum powder, and thus reduce the occurrence of corrosion reactions. In addition, the interface of MXene is regulated to adjust the infrared reflectivity, so as to obtain an infrared stealth coating material with low infrared emissivity. By adding an appropriate amount of effective directional agent and coordinating with the coating construction process, the flaky aluminum powder and MXene can be controlled to be parallel oriented near the surface in the coating, the surface is more dense and uniform, the emissivity is reduced, and infrared radiation is effectively reflected to obtain a low-reflective, corrosion-resistant infrared stealth coating material. The coating material of the present invention has the advantages of simple preparation process, convenient application, and easy performance regulation, and can make military facilities and equipment have stealth performance without changing the original appearance and structure of military equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram of the infrared stealth effect of the infrared stealth coating material corresponding to Example 1 of the present invention coated on filter paper.

[0024] Figure 2 These are infrared thermal imaging images of the coating surface of the infrared stealth coating corresponding to Examples 1, 2, 3, 4 of the present invention and Comparative Example 1, which is kept warm for 20 minutes at different heating temperatures.

[0025] Figure 3 The potentiodynamic polarization curves of the infrared stealth coatings corresponding to Examples 1, 2, 3, 4 and Comparative Example 1 of the present invention in a 3.5 wt % NaCl solution.

[0026] Figure 4 This is a diagram of the infrared stealth effect of the infrared stealth coating material corresponding to Example 6 of the present invention coated on the fabric.

[0027] Figure 5 The temperature difference between the coating surface and the heating platform surface when the infrared stealth coating corresponding to Example 2 of the present invention and Comparative Examples 1, 2, 3, and 4 is kept warm for 20 minutes at different heating temperatures. DETAILED DESCRIPTION

[0028] In order to further understand the present invention, the present invention is described below in conjunction with embodiments. These descriptions are only to further explain the features and advantages of the present invention and are not intended to limit the claims of the present invention.

[0029] The present invention provides a low-reflective and corrosion-resistant infrared stealth coating material. The infrared stealth coating is composed of 10% to 25% aluminum powder, 5% to 20% interface-regulated MXene, 18% to 29% adhesive, 1% to 2% directional agent, and 40% to 50% solvent, based on mass percentage; the interface-regulated MXene is -OH-terminated MXene or hydrophobic MXene.

[0030] The method for preparing the infrared stealth coating material comprises the following steps:

[0031] Step 1: Prepare MXene and etch it with an etching solution to obtain Ti 3 C 2 T X ; Interface regulation of MXene to obtain interface-regulated -OH-terminated MXene or hydrophobic MXene;

[0032] Step 2: Add aluminum powder, interface-controlled MXene, adhesive and directional agent to the solvent in sequence, and stir at a speed of 800-1000 r / min at 50-70° C. to obtain the infrared stealth coating material.

[0033] The method for interfacial regulation of MXene can adopt end group regulation to prepare -OH end group MXene, and can also adopt interfacial chemical modification method to perform interfacial regulation on MXene to obtain hydrophobic MXene.

[0034] -OH-terminated MXene is prepared by end group regulation: LiOH, NaOH or KOH solution is added to treat MXene, metal cations are intercalated, and the -F end groups are replaced by -OH groups to obtain interface-regulated -OH-terminated MXene.

[0035] The interface of MXene is regulated by interfacial chemical modification: functional alkoxysilane is used to perform interfacial chemical modification on MXene, which undergoes a condensation reaction with the hydroxyl groups on the surface of MXene to form Ti-O-Si bonds, and various functional groups are grafted onto the surface of MXene to change its hydrophilicity and hydrophobicity.

[0036] In the infrared stealth coating material, the aluminum powder is flaky aluminum powder with a particle size of 20 to 30 μm, the adhesive is one of epoxy resin, alkyd resin and water-based polyurethane, the directing agent is one of polyamide wax, lithium magnesium silicate and cellulose acetate butyrate, and the solvent is one of water and toluene.

[0037] Example 1

[0038] Step 1: Use etching solution to etch Ti 3 C 2 T X, i.e. MXene, MXene is added to a water / ethanol mixture (water / ethanol 10wt%:90wt%), and then acetic acid is added to reduce the pH value of the reaction system to 3.5. Subsequently, (dodecyl) triethoxysilane is added to the above mixture and stirred under nitrogen bubbling at room temperature. The mass ratio of (dodecyl) triethoxysilane to MXene is 2:1. Finally, centrifugal washing and vacuum drying at 60°C are performed to obtain an interfacial chemically modified hydrophobic MXene;

[0039] Step 2: Add aluminum powder (25%), MXene (5%), epoxy resin (18.5%) as an adhesive, and polyamide wax (1.5%) as a directing agent to a toluene solvent (50%), and stir at a speed of 1000 r / min at 60° C. for 10 min to obtain the infrared stealth coating material.

[0040] Example 2

[0041] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, MXene is added to a water / ethanol mixture (water / ethanol 10wt%:90wt%), and then acetic acid is added to reduce the pH value of the reaction system to 3.5. Subsequently, (dodecyl) triethoxysilane is added to the above mixture and stirred under nitrogen bubbling at room temperature. The mass ratio of (dodecyl) triethoxysilane to MXene is 2:1. Finally, centrifugal washing and vacuum drying at 60°C are performed to obtain an interfacial chemically modified hydrophobic MXene;

[0042] Step 2: Add aluminum powder (20%), MXene (10%), epoxy resin (18.5%) as an adhesive, and polyamide wax (1.5%) as a directing agent to a toluene solvent (50%), and stir at a speed of 1000 r / min at 60° C. for 10 min to obtain the infrared stealth coating material.

[0043] Example 3

[0044] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, MXene is added to a water / ethanol mixture (water / ethanol 10wt%:90wt%), and then acetic acid is added to reduce the pH value of the reaction system to 3.5. Subsequently, (dodecyl) triethoxysilane is added to the above mixture and stirred under nitrogen bubbling at room temperature. The mass ratio of (dodecyl) triethoxysilane to MXene is 2:1. Finally, centrifugal washing and vacuum drying at 60°C are performed to obtain an interfacial chemically modified hydrophobic MXene;

[0045] Step 2: Add aluminum powder (15%), MXene (15%), epoxy resin (18.5%) as an adhesive, and polyamide wax (1.5%) as a directing agent to a toluene solvent (50%), and stir at a speed of 1000 r / min at 60° C. for 10 min to obtain the infrared stealth coating material.

[0046] Example 4

[0047] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, MXene is added to a water / ethanol mixture (water / ethanol 10wt%:90wt%), and then acetic acid is added to reduce the pH value of the reaction system to 3.5. Subsequently, (dodecyl) triethoxysilane is added to the above mixture and stirred under nitrogen bubbling at room temperature. The mass ratio of (dodecyl) triethoxysilane to MXene is 2:1. Finally, centrifugal washing and vacuum drying at 60°C are performed to obtain an interfacial chemically modified hydrophobic MXene;

[0048] Step 2: Add aluminum powder (10%), MXene (20%), epoxy resin (18.5%) as an adhesive, and polyamide wax (1.5%) as a directing agent to a toluene solvent (50%), and stir at a speed of 1000 r / min at 60° C. for 10 min to obtain the infrared stealth coating material.

[0049] Example 5

[0050] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, MXene is added to a water / ethanol mixture (water / ethanol 10wt%:90wt%), and then acetic acid is added to reduce the pH value of the reaction system to 3.5. Subsequently, (dodecyl) triethoxysilane is added to the above mixture and stirred under nitrogen bubbling at room temperature. The mass ratio of (dodecyl) triethoxysilane to MXene is 2:1. Finally, centrifugal washing and vacuum drying at 60°C are performed to obtain an interfacial chemically modified hydrophobic MXene;

[0051] Step 2: Add aluminum powder (20%), MXene (10%), alkyd resin (18%) as a binder, and lithium magnesium silicate (2%) as a directing agent to a toluene solvent (50%), and stir at a speed of 900 r / min at 70° C. for 10 min to obtain the infrared stealth coating material.

[0052] Example 6

[0053] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, MXene is added to a water / ethanol mixture (water / ethanol 10wt%:90wt%), and then acetic acid is added to reduce the pH value of the reaction system to 3.5. Subsequently, (dodecyl) triethoxysilane is added to the above mixture and stirred under nitrogen bubbling at room temperature. The mass ratio of (dodecyl) triethoxysilane to MXene is 2:1. Finally, centrifugal washing and vacuum drying at 60°C are performed to obtain an interfacial chemically modified hydrophobic MXene;

[0054] Step 2: Add aluminum powder (15%), MXene (15%), alkyd resin (18%) as a binder, and lithium magnesium silicate (2%) as a directing agent to a toluene solvent (50%), and stir at a speed of 900 r / min at 70° C. for 10 min to obtain the infrared stealth coating material.

[0055] Example 7

[0056] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, MXene is added to a water / ethanol mixture (water / ethanol 10wt%:90wt%), and then acetic acid is added to reduce the pH value of the reaction system to 3.5. Subsequently, (dodecyl) triethoxysilane is added to the above mixture and stirred under nitrogen bubbling at room temperature. The mass ratio of (dodecyl) triethoxysilane to MXene is 2:1. Finally, centrifugal washing and vacuum drying at 60°C are performed to obtain an interfacial chemically modified hydrophobic MXene;

[0057] Step 2: Add aluminum powder (10%), MXene (20%), alkyd resin (18%) as a binder, and lithium magnesium silicate (2%) as a directing agent to a toluene solvent (50%), and stir at a speed of 900 r / min at 70° C. for 10 min to obtain the infrared stealth coating material.

[0058] Example 8

[0059] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, was treated with 1M NaOH solution and stirred under nitrogen bubbling at room temperature. Metal cations were intercalated and the -F end groups were replaced by -OH groups. Finally, centrifugal washing and vacuum drying at 60°C were performed to obtain hydrophilic -OH end group MXene with end group regulation.

[0060] Step 2: Add aluminum powder (20%), MXene (10%), waterborne polyurethane (29%) as a binder, and cellulose acetate butyrate (1%) as a directing agent to the aqueous solution (40%), stir at a speed of 800 r / min at 50° C. for 10 min to obtain the infrared stealth coating material.

[0061] Example 9

[0062] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, was treated with 1M NaOH solution and stirred under nitrogen bubbling at room temperature. Metal cations were intercalated and the -F end groups were replaced by -OH groups. Finally, centrifugal washing and vacuum drying at 60°C were performed to obtain hydrophilic -OH end group MXene with end group regulation.

[0063] Step 2: Add aluminum powder (20%), MXene (10%), waterborne polyurethane (29%) as a binder, and cellulose acetate butyrate (1%) as a directing agent to the aqueous solution (40%), stir at a speed of 800 r / min at 50° C. for 10 min to obtain the infrared stealth coating material.

[0064] Example 10

[0065] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, was treated with 1M NaOH solution and stirred under nitrogen bubbling at room temperature. Metal cations were intercalated and the -F end groups were replaced by -OH groups. Finally, centrifugal washing and vacuum drying at 60°C were performed to obtain hydrophilic -OH end group MXene with end group regulation.

[0066] Step 2, add aluminum powder (15%), MXene (15%), adhesive (water-based polyurethane) (29%), and directional agent (cellulose acetate butyrate) (1%) to the aqueous solution (40%) in sequence, and stir at a speed of 800 r / min at 50° C. for 10 minutes to obtain the water-based infrared stealth coating.

[0067] Comparative Example 1: Aluminum powder used alone

[0068] Step 1, add aluminum powder (30%), adhesive epoxy resin (18.5%), and directional agent polyamide wax (1.5%) to toluene solvent (50%) in sequence, stir at a speed of 1000r / min at 60°C for 10 minutes, and obtain the infrared stealth coating material.

[0069] Comparative Example 2: MXene used alone

[0070] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, MXene was added to a water / ethanol mixture (water / ethanol 10wt%:90wt%), and then acetic acid was added to reduce the pH value of the reaction system to 3.5. Subsequently, (dodecyl)triethoxysilane (DCTES) was added to the above mixture and stirred under nitrogen bubbling at room temperature. The mass ratio of (dodecyl)triethoxysilane to MXene was 2:1. Finally, centrifugal washing and vacuum drying at 60°C were performed to obtain the hydrophobic MXene with interfacial chemical modification;

[0071] Step 2: Add aluminum powder (0%), MXene (30%), epoxy resin (18.5%) as an adhesive, and polyamide wax (1.5%) as a directing agent to a toluene solvent (50%), and stir at a speed of 1000 r / min at 60° C. for 10 min to obtain the infrared stealth coating material.

[0072] Comparative Example 3: No Interface Control

[0073] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, was centrifuged and washed, and vacuum dried at 60 °C to obtain MXene that was not regulated by the interface;

[0074] Step 2: Add aluminum powder (20%), MXene (10%), epoxy resin (18.5%) as an adhesive, and polyamide wax (1.5%) as a directing agent to a toluene solvent (50%), and stir at a speed of 1000 r / min at 60° C. for 10 min to obtain the infrared stealth coating material.

[0075] Comparative Example 4: No Orientation Adjustment

[0076] Step 1: Use etching solution to etch Ti 3 C 2 T X , i.e. MXene, MXene was added to a water / ethanol mixture (water / ethanol 10wt%:90wt%), and then acetic acid was added to reduce the pH value of the reaction system to 3.5. Subsequently, (dodecyl)triethoxysilane (DCTES) was added to the above mixture and stirred under nitrogen bubbling at room temperature. The mass ratio of (dodecyl)triethoxysilane to MXene was 2:1. Finally, centrifugal washing and vacuum drying at 60°C were performed to obtain the hydrophobic MXene with interfacial chemical modification;

[0077] Step 2: Add aluminum powder (20%), MXene (10%), epoxy resin (20%) and directional agent (0%) to toluene solvent (50%) in sequence, and stir at 60°C for 10 minutes at a speed of 1000 r / min to obtain the infrared stealth coating material.

[0078] Figure 1 The infrared stealth effect diagram of the infrared stealth coating material coated on the filter paper corresponding to Example 1. The filter paper coated with the infrared stealth coating material was placed on the palm and the airplane model, and detected by an infrared thermal imager. The temperature of the position covered by the filter paper on the palm decreased from 32°C to 23.4°C, and the temperature of the position covered by the filter paper on the airplane model decreased from 39°C to 23.4°C, indicating that the infrared stealth coating material of the present invention exhibits certain infrared stealth performance on both the palm and the airplane model.

[0079] Figure 2The infrared thermal images of the infrared stealth coating corresponding to Example 1 (MXene-05), Example 2 (MXene-10), Example 3 (MXene-15), Example 4 (MXene-20) and Comparative Example 1 (Al-30) are obtained by keeping the coating surface warm for 20 minutes at different heating temperatures. The coating material is applied to the surface of an aluminum sheet and placed on a heating table. Infrared thermal images of the coating after keeping the coating warm for 20 minutes at different temperatures are taken with an infrared thermal imager. The temperature difference between the coating surface and the heating table is recorded at different heating temperatures. The results show that when the heating stage is 58.8°C, the temperatures of the infrared stealth coatings corresponding to Comparative Example 1 and Examples 1, 2, 3, and 4 are 54.3°C, 53.8°C, 52.2°C, 52.8°C, and 52.1°C, respectively; when the heating stage is 109.8°C, the temperatures of the infrared stealth coatings corresponding to Comparative Example 1 and Examples 1, 2, 3, and 4 are 102.6°C, 100.9°C, 95.2°C, 97.7°C, and 96.9°C, respectively; when the heating stage is 165.6°C, the temperatures of the infrared stealth coatings corresponding to Comparative Example 1 and Examples 1, 2, 3, and 4 are 150.5°C, 147.9°C, 139.4°C, 141.4°C, and 143.7°C, respectively; When the temperature of the heating platform is 219.8℃, the temperature of the infrared stealth coating corresponding to Comparative Example 1 and Examples 1, 2, 3, and 4 is 195.1℃, 191.5℃, 179.0℃, 181.9℃, and 185.2℃, respectively; when the heating platform is 269.1℃, the temperature of the infrared stealth coating corresponding to Comparative Example 1 and Examples 1, 2, 3, and 4 is 231.3℃, 230.9℃, 218.1℃, 220.1℃, and 224.6℃, respectively; when the heating platform is 319.7℃, the temperature of the infrared stealth coating corresponding to Comparative Example 1 and Examples 1, 2, 3, 4, and 5 is 273.3℃, ​​272.4℃, 262.8℃, 265.8℃, and 268.5℃, respectively. The infrared stealth performance of the infrared stealth coating materials corresponding to Examples 1, 2, 3, and 4 is better than that of Comparative Example 1, indicating that the infrared stealth effect of the combination of MXene and aluminum powder is better than that of aluminum powder alone.

[0080] Figure 3 The potentiodynamic polarization curves of the infrared stealth coating materials corresponding to Example 1 (MXene-05), Example 2 (MXene-10), Example 3 (MXene-15), Example 4 (MXene-20) and Comparative Example 1 (Al-30) in 3.5wt% NaCl solution. The corrosion potential of the infrared stealth coating material corresponding to Comparative Example 1 is -0.941V vs.SCE, and the corrosion current is 6.02×10 -5 A / cm 2 The corrosion potential of the infrared stealth coating material corresponding to Example 1 is -0.706V vs.SCE, and the corrosion current is 8.12×10 -6 A / cm2 The corrosion potential of the infrared stealth coating material corresponding to Example 2 is -0.814V vs.SCE, and the corrosion current is 2.44×10 -6 A / cm 2 The corrosion potential of the infrared stealth coating material corresponding to Example 3 is -0.859Vvs.SCE, and the corrosion current is 7.37×10 -6 A / cm 2 The corrosion potential of the infrared stealth coating material corresponding to Example 4 is -0.952V vs.SCE, and the corrosion current is 7.88×10 -6 A / cm 2 The infrared stealth coating material corresponding to Example 1 has the best anti-corrosion performance and is better than that of Comparative Example 1.

[0081] Figure 4 This is the infrared stealth effect diagram of the infrared stealth coating material corresponding to Example 6 coated on the fabric. The coating material was coated on the white lab coat and gloves. The application of the infrared stealth coating reduced the surface temperature of the white lab coat and gloves from 25.4°C and 21.5°C to 15.2°C and 15.8°C, respectively, which is close to the ambient temperature, thereby achieving the infrared stealth effect. The application potential of MXene infrared stealth coating as an infrared stealth material with convenient application and excellent performance in clothing and protective equipment is simulated.

[0082] Figure 5 The temperature difference between the coating surface and the heating table surface of the infrared stealth coating corresponding to Example 2 (MXene-10) of the present invention and Comparative Example 1 (Al-30), Comparative Example 2 (MXene-30), Comparative Example 3 (Unregulated interface), and Comparative Example 4 (Unregulated orientation) is kept warm for 20 minutes at different heating temperatures. The coating material is applied to the surface of an aluminum sheet and placed on a heating table, and the temperature difference between the coating surface and the heating table kept warm for 20 minutes at different heating temperatures is recorded. Compared with the infrared stealth coating corresponding to Comparative Examples 1 and 2, the temperature difference of the infrared stealth coating corresponding to Example 2 is higher, indicating that the infrared stealth effect of MXene and aluminum powder used in combination is better than that of using them alone. Compared with the infrared stealth coating corresponding to Comparative Examples 3 and 4, the temperature difference of the infrared stealth coating corresponding to Example 2 is higher, indicating that interface regulation and orientation regulation can improve the infrared stealth effect.

Claims

1. An infrared stealth coating material, characterized in that: The infrared stealth coating material is composed of 10% to 25% aluminum powder, 5% to 20% interface-regulated MXene, 18% to 29% adhesive, 1% to 2% directional agent, and 40% to 50% solvent in terms of mass percentage; the interface-regulated MXene is -OH-terminated MXene or hydrophobic MXene; the aluminum powder is flaky aluminum powder with a particle size of 20 to 30 μm; The -OH terminal MXene is prepared by the following method: Treat MXene with LiOH, NaOH or KOH solution to obtain interface-regulated -OH-terminated MXene; The hydrophobic MXene is prepared by the following method: MXene is reacted with alkoxysilane to obtain hydrophobic MXene.

2. The infrared stealth coating material according to claim 1, characterized in that: The MXene is Ti3C2T X .

3. The infrared stealth coating material according to claim 1, characterized in that: The solvent is one of water and toluene.

4. The infrared stealth coating material according to claim 1, characterized in that: The adhesive is one of epoxy resin, alkyd resin and waterborne polyurethane.

5. The infrared stealth coating material according to claim 1, characterized in that: The orienting agent is one of polyamide wax, lithium magnesium silicate and cellulose acetate butyrate.

6. The method for preparing the infrared stealth coating material according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1, interface regulation of MXene to obtain interface-regulated MXene; Step 2: Add aluminum powder, interface-regulated MXene, adhesive and directional agent to the solvent in sequence and stir to obtain the infrared stealth coating material.

7. The method for preparing the infrared stealth coating material according to claim 6, characterized in that: Stir at 50~70℃, with a stirring speed of 800~1000r / min.

8. An infrared stealth object, characterized in that: The surface of the object is coated with the infrared stealth coating material according to any one of claims 1 to 5.

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