Short-wave infrared camouflage material and preparation method thereof

Abstract

The application discloses a short-wave infrared camouflage material and a preparation method thereof, and relates to the technical field of functional materials. The camouflage material comprises, from bottom to top, a flame-retardant layer, a conductive layer, a substrate layer, a high-reflection layer and a camouflage layer; the substrate layer is a high-strength fiber base cloth, the surface density of which is 90-120 g / m 2 ; the conductive layer is formed by curing conductive paint, and the surface resistance thereof is less than or equal to 200 ohms; the high-reflection layer is formed by curing high-reflection paint containing rutile-phase titanium dioxide; and the camouflage layer is a water-based camouflage paint, which contains black and yellow microcapsules prepared by interface polymerization reaction of perylene black and 150 yellow. The reflectivity of the material in the near-infrared band can be adjusted by adjusting the thickness of the camouflage layer, so that the material meets the channel requirements. The camouflage material has the multi-spectrum compatible camouflage capability in visible light, near-infrared and radar, has excellent mechanical properties, and has a simple preparation process and is beneficial to large-scale production.

Description

Technical Field

[0001] This invention relates to the field of functional materials technology, specifically to a short-wave infrared camouflage material and its preparation method. Background Technology

[0002] In the field of modern military camouflage and stealth technology, the 1200nm, 1400nm, 1800nm, and 2500nm short-wave infrared bands are important reflectivity detection ranges and are also the core for achieving the spectral fusion of military targets with the natural background. With the rapid development of multispectral reconnaissance and precision guidance technologies, single visible light camouflage can no longer meet the stealth requirements of equipment. It is necessary to precisely control the reflectivity of materials in the above-mentioned bands to match the spectral characteristics of equipment with those of vegetation, soil, and other background elements, thereby avoiding detection by infrared detectors.

[0003] For the aforementioned short-wave infrared camouflage materials, existing technologies typically employ three main approaches: functional coatings, micro / nano metasurfaces, and biomimetic composites. These technologies rely on metal oxides, rare-earth ceramic pigments, and multilayer micro / nano structures. Through formulation control and biomimetic porous water-retention design, precise control of reflectivity in this band can be achieved, effectively simulating the water vapor absorption characteristics of vegetation at 1400nm and 1800nm. The overall spectral matching degree reaches 85%~90%, and the key band indicators basically meet the usage requirements of relevant military camouflage standards. However, these materials still have significant shortcomings: First, the simulation accuracy of the 1400nm and 1800nm ​​water vapor absorption valleys is insufficient, resulting in weak long-term water retention capacity and easy exposure under short-wave infrared detection. Second, the performance of 1200~2500nm short-wave infrared camouflage is difficult to achieve broadband compatibility and balance with thermal infrared and laser camouflage. Third, the spectral control technology in the 2500nm band is weak, resulting in high reflectivity and low matching degree with standard requirements. Fourth, there are engineering bottlenecks: insufficient uniformity and maintainability in large-area coating. Summary of the Invention

[0004] The purpose of this invention is to provide a short-wave infrared camouflage material and its preparation method to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a short-wave infrared camouflage material, wherein the camouflage material comprises, from bottom to top, a flame-retardant layer, a conductive layer, a substrate layer, a high-reflectivity layer and a camouflage layer; The substrate layer is a high-strength fiber base fabric with a surface density of 90~120g / ㎡, thereby ensuring the mechanical properties and certain light transmittance of the base fabric. The flame-retardant layer is formed by curing a flame-retardant coating into a film, which has a flame-retardant effect and a thickness of 5μm, providing flame retardancy to the material. The conductive layer is formed by curing a conductive coating into a film, with a weight gain of 15~20g / m³. 2 The surface resistance of the conductive coating is ≤200Ω, indicating that it has conductive properties.

[0006] Furthermore, the conductive coating is composed of the following raw materials in parts by weight: 70 parts resin A, 15-20 parts black conductive powder, 80-100 parts solvent A and 5-10 parts dispersant A.

[0007] Furthermore, resin A is an oil-based polyurethane or epoxy resin, possessing excellent encapsulation and mechanical properties; solvent A includes oil-based DMF, toluene, methanol, etc.; the black conductive powder includes one or more of conductive carbon black, acetylene black, graphene, and carbon nanotubes, which exhibit dispersibility and stability in oil-based solvents; dispersant A is a special dispersant for carbon black materials, exhibiting good dispersibility for conductive carbon black, carbon nanotubes, etc.

[0008] Furthermore, the high-reflectivity layer is formed by curing a white high-reflectivity coating into a film, and the weight gain of the coating is 30~40g / m² depending on the base fabric material. 2 It can cover the conductive layer on the back of the material and work together with the conductive layer to regulate the reflectivity of the reflective layer in the short-wave infrared.

[0009] Furthermore, the high-reflectivity coating is composed of the following raw materials in parts by weight: 50-60 parts resin B, 40-60 parts solvent B, 80-100 parts white powder, and 2-3 parts dispersant B; the resin B includes one of oil-based polyurethane, acrylic, or fluorocarbon resin, which has excellent aging performance and mechanical properties; the solvent B includes at least one of DMF and toluene; the white powder is rutile titanium dioxide, which has excellent stability, hiding power, and high reflectivity, and can improve the near-infrared reflectivity of the reflective layer; the dispersant B is an oil-based special inorganic pigment dispersant.

[0010] Furthermore, the camouflage layer is formed by curing camouflage paint into a film. The camouflage paint is a water-based paint with a thickness of no more than 12 μm. By controlling the coating thickness and the synergistic effect of high reflectivity, the near-infrared reflectivity of the material surface is regulated so that the material reflectivity meets the standard short-wave infrared reflectivity requirements.

[0011] Furthermore, the camouflage coating is composed of the following raw materials in parts by weight: 220-450 parts resin emulsion, 150-200 parts water, 200-460 parts microcapsules, 2-5 parts red pigment, 5-10 parts green pigment, and 8-15 parts additives; wherein the emulsion is an aqueous acrylic or polyurethane emulsion; the microcapsules are a mixture of 80-160 parts black microcapsules and 120-300 parts yellow microcapsules; the red pigment is a high-molecular-weight organic red with a solid content of 50 wt% and deionized water as the solvent; the green pigment is a chromium oxide green pigment with a solid content of 60 wt% and deionized water as the solvent; additive C includes an aqueous dispersant, an aging aid, an adhesion promoter, and an infrared additive, etc.; the adhesion promoter is HY-962; the infrared additive is an inorganic oxide used to absorb stray light in the visible light-1200nm band, and the particle size is usually less than 200nm.

[0012] Furthermore, the microcapsules are produced by interfacial polymerization of organic pigments and emulsions, including the following preparation steps: S1: Pigment monomer preparation: Perylene black pigment and 150 yellow pigment were dispersed in DMPU respectively, maintaining the monomer state and keeping the monomer concentration ≤1200mg / L, to obtain perylene black / DMPU dispersed monomer as black pigment monomer and 150 yellow / DMPU monomer as yellow pigment monomer. S2: Preparation of black emulsion: PEI was added to a 1200 mg / L perylene black / DMPU dispersion monomer solution to prepare a 300 mg / mL PEI dispersion phase; then 4 mL of the dispersion phase was injected into a 40 mL PIB / n-hexane solution containing 0.1 mL oleic acid. The mass fraction of PIB in the PIB / n-hexane solution was 11.07 wt%. The mixture was stirred at 1000 rpm for 10 min to obtain a black emulsion. S3: Preparation of yellow emulsion: PEI was added to a 1200 mg / L 150 yellow / DMPU dispersion monomer solution to prepare a 300 mg / mL PEI dispersion phase; then 4 mL of the dispersion phase was injected into a 40 mL PIB / n-hexane solution containing 0.1 mL oleic acid. The mass fraction of PIB in the PIB / n-hexane solution was 11.07 wt%. The mixture was stirred at 1000 rpm for 10 min to obtain a yellow emulsion. S4: Preparation of black microcapsules: The emulsion was dispersed at 500 rpm, and TDI solution was added to the black emulsion. The TDI solution was prepared by dissolving 1 mL of TDI in 29 mL of n-hexane to initiate the interfacial polymerization reaction. After 2 min, the microcapsule suspension was diluted to 100 mL with n-hexane, allowed to stand for 30 min, and the supernatant was discarded. The precipitated microcapsules were washed three times with n-hexane and dried under vacuum to obtain black microcapsules. S5: Preparation of yellow microcapsules: The emulsion was dispersed at a dispersion speed of 500 rpm, and TDI solution was added to the yellow emulsion. The TDI solution was prepared by dissolving 1 mL of TDI in 29 mL of n-hexane to initiate the interfacial polymerization reaction. After 2 min, the microcapsule suspension was diluted to 100 mL with n-hexane, allowed to stand for 30 min, and the supernatant was discarded. The precipitated microcapsules were washed 3 times with n-hexane and dried under vacuum to obtain yellow microcapsules.

[0013] Furthermore, the PIB / n-hexane solution contains 11.07 wt% PIB, and the TDI solution is prepared by dissolving 1 mL of TDI in 29 mL of n-hexane.

[0014] Furthermore, a method for preparing a short-wave infrared camouflage material includes the following preparation steps: P1: Preparation of conductive coating: Weigh out the oily resin, black conductive powder, solvent A and dispersant A in the following weight proportions (60~70): (15~20): (80~100): (5~10). Disperse the oily resin, black conductive powder, solvent A and dispersant A in the following order in a container at a dispersion speed of 1000 rpm. Then grind the mixture using a grinder to obtain a black conductive coating with a fineness of no more than 20 μm for later use. P2: Preparation of high reflectivity coating: Weigh out resin B, solvent B, white powder and dispersant B in parts by weight (50~60): (40~60): (80~100): (2~3), and disperse them in a container in the order of solvent B, resin B, dispersant B and white powder at a dispersion speed of 1000 rpm. Then grind them with a grinder to obtain a white high reflectivity coating with a fineness of no more than 20 μm for later use. P3: Preparation of microcapsules: Prepare sufficient amounts of yellow and black microcapsules according to synthesis steps S1~S5 for later use; P4: Preparation of camouflage paint: Weigh out resin emulsion, water, microcapsules, red pigment paste, green pigment paste and additives according to the following weight parts: (220~450): (150~200): (200~460): (2~5): (5~10): (8~15), and disperse them in a container in the following order: water, resin emulsion, additives, microcapsules, red pigment paste and green pigment paste at a dispersion speed of 1000 rpm to obtain camouflage paint for later use; P5: Preparation of high reflectivity layer: High reflectivity coating is applied to the front side of the base fabric using equipment such as a doctor blade and wire bar and cured at high temperature to form a film, controlling the coating weight gain to be 30~40g / ㎡; P6: Preparation of conductive layer: Using equipment such as doctor blade and wire bar, the conductive coating is applied to the reverse side of the base fabric and cured into a film at high temperature. The weight gain of the coating is controlled to be 15~20g / ㎡ and the surface resistance is ≤200Ω. P7: Flame retardant layer preparation: Flame retardant coating is applied to the surface of the conductive coating using equipment such as a scraper and wire bar and then cured into a film at high temperature; P8: Camouflage layer preparation: Camouflage paint is applied to the surface of the high-reflectivity layer using equipment such as a scraper and wire rod and then cured into a film at high temperature. The thickness of the camouflage layer is controlled within 12μm. The spectral channel requirements are achieved by adjusting the near-infrared reflectivity by controlling the thickness of the camouflage layer.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. By adjusting the thickness of the camouflage layer, the reflectivity of the material in the near-infrared band can be adjusted to meet the channel requirements.

[0016] 2. While meeting the short-wave infrared camouflage performance requirements, the color parameters of the material of this invention all meet the requirements of GJB1082A-2021 standard, with a color difference of less than 3, thus achieving integrated compatibility of visible light and near-infrared camouflage.

[0017] 3. By introducing a conductive layer, the material acquires certain radar absorption properties. Combined with near-infrared and visible light camouflage functions, it achieves a camouflage effect that is compatible with optical, near-infrared, and radar multi-spectrum frequencies.

[0018] 4. The material uses a high-strength fiber base fabric and a high-performance resin system, which has good mechanical properties, adhesion and aging resistance; at the same time, it is equipped with a flame-retardant layer to improve the fire safety of the material.

[0019] 5. This invention uses a conventional coating process to coat and cure layer by layer. The process flow is clear, the operation is controllable, it is suitable for large-area continuous production, and it has good prospects for engineering applications.

[0020] 6. The camouflage layer thickness can be controlled within 12μm. By adjusting the coating thickness and microcapsule ratio, the reflectivity in the near-infrared band can be finely adjusted to meet the spectral camouflage requirements of different background environments. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is the composition of the functional coating of the short-wave infrared material in this invention; Figure 2 The reflectance curve and spectral channels of the dark green DG0847 camouflage material prepared in Example 1 of this invention in the 1200nm~2500nm band; Figure 3 The reflectance curve and spectral channels of the medium-green MG1151 camouflage material prepared in Example 2 of this invention in the 1200nm~2500nm wavelength range; Figure 4 The reflectance curves and spectral channels of the dark green DG0730 camouflage material prepared in Example 3 of this invention are shown in the 1200nm~2500nm wavelength range. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1: This embodiment provides a dark green DG0847 shortwave infrared camouflage material and its preparation method. The material includes, from bottom to top, a flame-retardant layer, a conductive layer, a base fabric, a high-reflectivity layer, and a camouflage layer.

[0024] Table 1. Formulation ratio of high-reflectivity coating in Example 1 Table 2. Formulation ratio of conductive coating in Example 1 Table 3. Formulation ratio of dark green DG0847 camouflage paint in Example 1 In this embodiment, black and yellow microcapsules are prepared according to steps S1 to S5. Conductive coating, highly reflective coating and dark green DG0847 camouflage coating are prepared according to the formula in Table 1 and processes P1 to P4. Highly reflective coating, conductive coating, flame retardant coating and dark green DG0847 camouflage coating are prepared on the surface of the base fabric according to steps P5 to P8.

[0025] The base fabric is a reinforced polyester checkered fabric with an areal density of 100 g / m². 2 ; The highly reflective coating is formed by curing a self-made highly reflective paint onto the front surface of the base fabric, with a coating weight gain of 34 g / m². 2 ; The conductive layer is formed by curing a self-made black conductive coating onto the reverse side of the base fabric, with a coating weight gain of 15 g / m². 2 The surface resistance is 90Ω; The flame-retardant coating is a flame-retardant paint cured into a film on the surface of the conductive layer. The flame-retardant paint is a commercially available oil-based flame-retardant paint. The camouflage layer is a self-made dark green DG0847 camouflage paint, which is cured into a film on the surface of the high reflectivity layer with a thickness of 6μm.

[0026] The dark green DG0847 camouflage material prepared using the above process was tested for properties such as color, spectral reflectance, and fastness. Figure 2 The image shows the spectral reflectance curves and channel requirements of dark green DG0847 camouflage material with a suitable camouflage layer thickness in the 1200-2500 nm range. Figure 2 It can be seen that the dark green DG0847 camouflage material with the appropriate camouflage layer thickness meets the requirements. The colorimetric data of the prepared dark green DG0847 camouflage material are shown in Tables 4 and 5.

[0027] Table 4 Optical colorimetric data of dark green DG0847 camouflage material Table 5. Reflectance data of dark green DG0847 camouflage material at 1200nm, 1400nm, 1800nm ​​and 2500nm. As can be seen from Tables 4 and 5, the dark green camouflage material meets the colorimetric data (color difference < 3) of the GJB1082A-2021 standard color (DG0847), and its reflectivity at 1200nm, 1400nm, 1800nm ​​and 2500nm is satisfactory.

[0028] Example 2: This embodiment provides a medium-green MG1151 short-wave infrared camouflage material and its preparation method. The material includes, from bottom to top, a flame-retardant layer, a conductive layer, a base fabric, a high-reflectivity layer, and a medium-green camouflage layer.

[0029] Table 6. Formulation ratio of Zhonglv MG1151 camouflage paint in Example 2 In this embodiment, black and yellow microcapsules are prepared according to steps S1 to S5. Conductive coating, highly reflective coating and medium green MG1151 camouflage coating are prepared according to the formulations in Tables 1 and 2 of Example 1, the formulations in Table 6 of Example 2 and processes P1 to P4. Highly reflective coating, conductive coating, flame retardant coating and medium green MG1151 camouflage coating are prepared on the surface of the base fabric according to steps P5 to P8.

[0030] The base fabric is a reinforced polyester checkered fabric with an areal density of 100 g / m². 2 ; The highly reflective coating is formed by curing a self-made highly reflective paint onto the front surface of the base fabric, with a coating weight gain of 34 g / m². 2 ; The conductive layer is formed by curing a self-made black conductive coating onto the reverse side of the base fabric, with a coating weight gain of 15 g / m². 2 The surface resistance is 90Ω; The flame-retardant coating is a flame-retardant paint cured into a film on the surface of the conductive layer. The flame-retardant paint is a commercially available oil-based flame-retardant paint. The camouflage layer is a self-made medium green MG1151 camouflage paint, which is cured into a film on the surface of the high reflectivity layer with a thickness of 10μm.

[0031] The Zhonglv MG1151 camouflage material prepared according to the above process was tested for properties such as color, spectral reflectance, and fastness. Figure 3 The diagram shows the spectral reflectance curves of the medium green MG1151 camouflage material in the 1200–2500 nm range, representing the required channel thickness for a suitable camouflage layer. Figure 3 It can be seen that the medium green MG1151 camouflage material with the appropriate camouflage layer thickness meets the requirements. The colorimetric data of the prepared medium green MG1151 camouflage material are shown in Tables 7 and 8.

[0032] Table 7 Optical colorimetric data of Zhonglv MG1151 camouflage material Table 8. Reflectance data of Zhonglv MG1151 camouflage material at 1200nm, 1400nm, 1800nm ​​and 2500nm. As can be seen from Tables 7 and 8, this medium-green camouflage material meets the colorimetric data (color difference < 3) of the GJB1082A-2021 standard color (MG1151), and its reflectivity at 1200nm, 1400nm, 1800nm ​​and 2500nm is satisfactory.

[0033] Example 3: This embodiment provides a dark green DG0730 shortwave infrared camouflage material and its preparation method. The material includes, from bottom to top, a flame-retardant layer, a conductive layer, a base fabric, a high-reflectivity layer, and a dark green DG0730 camouflage layer.

[0034] Table 9. Formulation ratio of dark green DG0730 camouflage paint in Example 3 In this embodiment, black and yellow microcapsules are prepared according to steps S1 to S5. Conductive coating, highly reflective coating and dark green DG0730 camouflage coating are prepared according to the formulations in Tables 1 to 2 of Example 1, the formulation in Table 9 of Example 3 and processes P1 to P4. Highly reflective coating, conductive coating, flame retardant coating and dark green DG0730 camouflage coating are prepared on the surface of the base fabric according to steps P5 to P8.

[0035] The base fabric is a reinforced polyester checkered fabric with an areal density of 100 g / m². 2 ; The highly reflective coating is formed by curing a self-made highly reflective paint onto the front surface of the base fabric, with a coating weight gain of 34 g / m². 2 ; The conductive layer is formed by curing a self-made black conductive coating onto the reverse side of the base fabric, with a coating weight gain of 15 g / m². 2 The surface resistance is 90Ω; The flame-retardant coating is a flame-retardant paint cured into a film on the surface of the conductive layer. The flame-retardant paint is a commercially available oil-based flame-retardant paint. The camouflage layer is a self-made dark green DG0730 camouflage paint, which is cured into a film on the surface of the high reflectivity layer with a thickness of 7μm.

[0036] The dark green DG0730 camouflage material prepared using the above process was tested for properties such as color, spectral reflectance, and fastness. Figure 4 The image shows the spectral reflectance curves and channel requirements of dark green DG0730 camouflage material with a suitable camouflage layer thickness in the 1200-2500 nm range. Figure 4 It can be seen that the dark green DG0730 camouflage material with the appropriate camouflage layer thickness meets the requirements. The colorimetric data of the prepared dark green DG0730 camouflage material are shown in Tables 10 and 11.

[0037] Table 10 Optical chromaticity data of dark green DG0730 camouflage material Table 11 Reflectance data of dark green DG0730 camouflage material at 1200nm, 1400nm, 1800nm ​​and 2500nm As can be seen from Tables 10 and 11, the dark green camouflage material meets the colorimetric data (color difference < 3) of the GJB1082A-2021 standard color (DG0730), and its reflectivity at 1200nm, 1400nm, 1800nm ​​and 2500nm is satisfactory.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No markings in the claims should be construed as limiting the scope of the claims.

Claims

1. A short-wave infrared camouflage material, characterized in that, The camouflage material, from bottom to top, includes a flame-retardant layer, a conductive layer, a substrate layer, a high-reflectivity layer, and a camouflage layer; The substrate layer is a high-strength fiber base fabric with a surface density of 90~120 g / m². 2 This ensures the mechanical properties and certain light transmittance of the base fabric; The flame-retardant layer is formed by curing flame-retardant coating into a film, which has a flame-retardant effect and provides flame retardancy to the material; The conductive layer is formed by curing a conductive coating into a film, with a weight gain of 15~20g / m³. 2 The surface resistance of the conductive coating is ≤200Ω, indicating that it has conductive properties.

2. The short-wave infrared camouflage material according to claim 1, characterized in that, The conductive coating is composed of the following raw materials in parts by weight: 70 parts resin A, 15-20 parts black conductive powder, 80-100 parts solvent A and 5-10 parts dispersant A.

3. The short-wave infrared camouflage material according to claim 2, characterized in that, The resin A is an oil-based polyurethane or epoxy resin; the solvent A includes one or more of oil-based DMF, toluene, and methanol; the black conductive powder includes one or more of conductive carbon black, acetylene black, graphene, and carbon nanotubes; and the dispersant A is a special dispersant for carbon black materials.

4. The short-wave infrared camouflage material according to claim 1, characterized in that, The high-reflectivity layer is formed by curing a white high-reflectivity coating into a film, and the weight gain of the coating is 30~40g / m² depending on the base fabric material. 2 .

5. A short-wave infrared camouflage material according to claim 4, characterized in that, The high-reflectivity coating is composed of the following raw materials in parts by weight: 50-60 parts resin B, 40-60 parts solvent B, 80-100 parts white powder and 2-3 parts dispersant B; the resin B includes one of oil-based polyurethane, acrylic or fluorocarbon resin; the solvent B includes at least one of DMF and toluene; the white powder is rutile titanium dioxide; and the dispersant B is an oil-based special inorganic pigment dispersant.

6. The short-wave infrared camouflage material according to claim 1, characterized in that, The camouflage layer is formed by curing camouflage paint into a film. The camouflage paint is a water-based paint with a thickness not exceeding 12μm.

7. A short-wave infrared camouflage material according to claim 6, characterized in that, The camouflage coating is composed of the following raw materials in parts by weight: 220-450 parts resin emulsion, 150-200 parts water, 200-460 parts microcapsules, 2-5 parts red pigment, 5-10 parts green pigment, and 8-15 parts additives; wherein the resin emulsion is one of water-based acrylic or polyurethane emulsion; the microcapsules are composed of 80-160 parts black microcapsules and 120-300 parts yellow microcapsules; the red pigment is a high-molecular-weight organic red with a solid content of 50 wt%; the green pigment is a chromium oxide green pigment with a solid content of 60 wt%; and additives C include water-based dispersants, aging aids, adhesion promoters, and infrared additives, etc.

8. A short-wave infrared camouflage material according to claim 7, characterized in that, The microcapsules are produced by interfacial polymerization of organic pigments and emulsions, including the following preparation steps: S1: Pigment monomer preparation: Perylene black pigment and 150 yellow pigment were dispersed in DMPU respectively, maintaining the monomer state and keeping the monomer concentration ≤1200mg / L, to obtain perylene black / DMPU dispersed monomer as black pigment monomer and 150 yellow / DMPU monomer as yellow pigment monomer. S2: Preparation of black emulsion: PEI was added to a 1200 mg / L perylene black / DMPU dispersion monomer solution to prepare a 300 mg / mL PEI dispersion phase; then 4 mL of the dispersion phase was injected into a 40 mL PIB / n-hexane solution containing 0.1 mL oleic acid, and stirred at 1000 rpm for 10 min to obtain a black emulsion. S3: Preparation of yellow emulsion: PEI was added to 1200 mg / L of 150 yellow / DMPU dispersion monomer solution to prepare 300 mg / mL PEI dispersion phase; then 4 mL of dispersion phase was injected into 40 mL of PIB / n-hexane solution containing 0.1 mL of oleic acid and stirred at 1000 rpm for 10 min to obtain yellow emulsion. S4: Preparation of black microcapsules: The emulsion was dispersed at a dispersion speed of 500 rpm, and TDI solution was added to the black emulsion to initiate the interfacial polymerization reaction; after 2 min, the microcapsule suspension was diluted to 100 mL with n-hexane, allowed to stand for 30 min, and the supernatant was discarded; the precipitated microcapsules were washed 3 times with n-hexane and dried under vacuum to obtain black microcapsules. S5: Preparation of yellow microcapsules: The emulsion was dispersed at a dispersion speed of 500 rpm, and TDI solution was added to the yellow emulsion to initiate the interfacial polymerization reaction; after 2 min, the microcapsule suspension was diluted to 100 mL with n-hexane, allowed to stand for 30 min, and the supernatant was discarded; the precipitated microcapsules were washed 3 times with n-hexane and dried under vacuum to obtain yellow microcapsules.

9. A short-wave infrared camouflage material according to claim 8, characterized in that, The PIB / n-hexane solution contains 11.07 wt% PIB, and the TDI solution is prepared by dissolving 1 mL of TDI in 29 mL of n-hexane.

10. A method for preparing a short-wave infrared camouflage material, characterized in that, The preparation steps include the following: P1: Preparation of conductive coating: Weigh out the oily resin, black conductive powder, solvent A and dispersant A in the following weight proportions (60~70): (15~20): (80~100): (5~10). Disperse the oily resin, black conductive powder, solvent A and dispersant A in the following order in a container at a dispersion speed of 1000 rpm. Then grind the mixture using a grinder to obtain a black conductive coating with a fineness of no more than 20 μm for later use. P2: Preparation of high reflectivity coating: Weigh out resin B, solvent B, white powder and dispersant B in parts by weight (50~60): (40~60): (80~100): (2~3), and disperse them in a container in the order of solvent B, resin B, dispersant B and white powder at a dispersion speed of 1000 rpm. Then grind them with a grinder to obtain a white high reflectivity coating with a fineness of no more than 20 μm for later use. P3: Preparation of microcapsules: Prepare sufficient amounts of yellow and black microcapsules according to synthesis steps S1~S5 for later use; P4: Preparation of camouflage paint: Weigh out resin emulsion, water, microcapsules, red pigment paste, green pigment paste and additives according to the following weight parts: (220~450): (150~200): (200~460): (2~5): (5~10): (8~15), and disperse them in a container in the following order: water, resin emulsion, additives, microcapsules, red pigment paste and green pigment paste at a dispersion speed of 1000 rpm to obtain camouflage paint for later use; P5: Preparation of the high-reflectivity layer: Using equipment such as a doctor blade and wire rod, the high-reflectivity coating is applied to the front side of the base fabric and cured at high temperature to form a film, controlling the coating weight gain to be 30~40g / m². 2 ; P6: Preparation of the conductive layer: The conductive coating is applied to the reverse side of the base fabric using equipment such as a doctor blade and wire rod, and then cured at high temperature to form a film, controlling the coating weight gain to be 15~20g / m². 2 Surface resistance ≤200Ω; P7: Flame retardant layer preparation: Flame retardant coating is applied to the surface of the conductive coating using equipment such as a scraper and wire bar and then cured into a film at high temperature; P8: Camouflage layer preparation: Camouflage paint is applied to the surface of the high-reflectivity layer using equipment such as a scraper and wire rod and then cured into a film at high temperature. The thickness of the camouflage layer is controlled within 12μm. The spectral channel requirements are achieved by adjusting the near-infrared reflectivity by controlling the thickness of the camouflage layer.

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