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CN-121994079-A - Multiband compatible stealth and camouflage integrated material and preparation method thereof

CN121994079ACN 121994079 ACN121994079 ACN 121994079ACN-121994079-A

Abstract

The invention provides a multiband compatible stealth and camouflage integrated material and a preparation method thereof, belonging to the technical field of functional stealth materials, the composite coating comprises a primer layer, a conductive layer, a first electromagnetic coating layer, a second electromagnetic coating layer, a finish layer and a low infrared emissivity layer which are sequentially arranged on the surface of the substrate. The electromagnetic coating with the flaky magnetically soft alloy as a filler is adopted, the shape and the filling proportion of the magnetically soft alloy are regulated, so that the electromagnetic parameters form gradient transition along the thickness direction, the magnetic loss and the interface polarization loss are enhanced, the broadband radar wave absorption of X-Ka wave bands is realized under the limited thickness, the stable radar scattering cross section shrinkage reduction performance is maintained under the condition of a large incidence angle, and the low infrared emissivity layer is used for reducing the infrared radiation characteristic and realizing visible camouflage. Through the collaborative design of the multilayer structure and the multiple thin coating film forming processes, the coating has excellent interlayer binding force, mechanical property and environmental durability, and the total thickness is controlled in a smaller range.

Inventors

  • Qi Xingze
  • LIU XIAOFANG
  • JIN WEN

Assignees

  • 山东大杼新材料有限公司
  • 北京航空航天大学

Dates

Publication Date
20260508
Application Date
20260214

Claims (10)

  1. 1. The preparation method of the multiband compatible stealth and camouflage integrated material is characterized by comprising the following steps of: Step 1, grinding the iron-based soft magnetic alloy to obtain flaky soft magnetic alloy powder; Step 2, adding a solvent into a dispersing container, premixing the solvent with a dispersing agent, adding flaky soft magnetic alloy powder for primary dispersion, adding an anti-settling agent for secondary dispersion, finally adding a bi-component modified epoxy resin, uniformly mixing, and carrying out vacuum defoaming to obtain a first electromagnetic coating and a second electromagnetic coating; Step 3, preprocessing the composite substrate to be coated to obtain a preprocessed substrate; step 4, sequentially spraying a primer layer, a conductive layer, a first electromagnetic coating, a second electromagnetic coating, a finish paint layer and a low infrared emissivity layer on the surface of the pretreated substrate to obtain a coating system; And 5, curing the coating system to obtain the integrated material compatible with stealth and camouflage.
  2. 2. The method for preparing the multiband compatible stealth and camouflage integrated material according to claim 1, wherein the particle size of the flaky soft magnetic alloy powder is 5-50 μm, and the thickness-to-diameter ratio is 0.05-0.3.
  3. 3. The method for preparing the multiband compatible stealth and camouflage integrated material according to claim 1, wherein the ratio of the rotation speeds of primary dispersion and secondary dispersion is 5-15:4-10; The ratio of the primary dispersion time to the secondary dispersion time is 2-12:1-6.
  4. 4. The method for producing a multi-band compatible camouflage and camouflage integrated material of claim 1, wherein the anti-settling agent is an organomodified bentonite, silica, modified silicate thixotropic agent, an organowax anti-settling agent and/or a polyamide wax anti-settling agent.
  5. 5. The method for preparing the multiband compatible stealth and camouflage integrated material according to claim 1, wherein the surfactant is a nonionic surfactant, an organosilicon modified nonionic surfactant and/or a weak polar surfactant.
  6. 6. The method for preparing the multiband compatible stealth and camouflage integrated material according to claim 1, wherein the ratio of the volume fractions of the flaky soft magnetic alloy powder, the bi-component modified epoxy resin, the dispersing agent, the auxiliary agent and the solvent in the first electromagnetic coating is 50-60:35-45:1-1.5:1.3-2:2.
  7. 7. The method for preparing the multiband compatible stealth and camouflage integrated material according to claim 1, wherein the volume fraction ratio of the flaky soft magnetic alloy powder, the bi-component modified epoxy resin, the dispersing agent, the auxiliary agent and the solvent in the second electromagnetic coating is 60-66:31-37:0.9-1:1.2-1.5:0.9-1.
  8. 8. The method of producing a multi-band compatible camouflage and stealth integrated material according to claim 1, wherein the low infrared emissivity layer has a thickness of 3-14 μm.
  9. 9. The method for preparing the multiband compatible stealth and camouflage integrated material according to claim 1, wherein the thickness-to-diameter ratio of the first electromagnetic coating is 0.05-0.1, and the thickness-to-diameter ratio of the second electromagnetic coating is 0.1-0.15.
  10. 10. The multi-band compatible camouflage and camouflage integrated material made according to any of the claims 1 to 9, wherein the compatible camouflage and camouflage integrated material comprises a primer layer, a conductive layer, a first electromagnetic paint layer, a second electromagnetic paint layer, a topcoat layer, and a low infrared emissivity layer; The total dry film thickness of the integrated material compatible with stealth and camouflage is less than 1.2 mm; the frequency band of the electromagnetic response of the integrated material compatible with stealth and camouflage is within the X-Ka frequency band.

Description

Multiband compatible stealth and camouflage integrated material and preparation method thereof Technical Field The invention relates to the technical field of functional materials, in particular to a multi-band wide-angle-domain ultrathin stealth composite coating and a preparation method thereof. Background Stealth technology is one of the important technologies for improving battlefield viability of modern weapon equipment in the process of counterreconnaissance, guidance and fire control systems. With the continued development of detection and countermeasure approaches, battlefield detection approaches include visible light imaging reconnaissance, infrared imaging and infrared search tracking (INFRARED SEARCH AND TRACK, IRST), and multi-system multi-band radar detection (e.g., space/ground surveillance radar, imaging radar, airborne or spaceborne side view synthetic aperture radar SAR, etc.). Under the above conditions, if the equipment only implements stealth for a single spectrum, the equipment may still be exposed in other spectrums, and it is difficult to meet the comprehensive stealth requirement. In radar stealth, wave-absorbing coatings (RAMs) typically dissipate electromagnetic energy through mechanisms such as dielectric loss, magnetic loss, eddy current loss, and interface polarization, and achieve impedance matching through structural design to reduce reflection and attenuate Radar Cross Section (RCS). With the expansion of radar to high frequency band and the enhancement of imaging radar application, the wave-absorbing coating needs to keep effective absorption in a wider frequency band (for example, X to Ka), and still has stability under the condition of a larger incidence angle so as to adapt to large-angle irradiation scenes such as side-looking SAR. Meanwhile, engineering application also requires that the coating has good adhesive force, flexibility, impact resistance, high and low temperature resistance, damp heat resistance, salt fog, solar radiation and other environmental adaptability, and also has thickness, surface density and construction maintainability. Infrared camouflage typically reduces infrared radiation characteristics by low emissivity materials, and visible camouflage relies primarily on color and pattern matching with the environment. In the prior art, in order to realize multi-spectrum compatible stealth, a multi-layer stacked composite coating structure is often adopted, namely, different functional layers such as a conductive loss layer/wave absorbing layer, an infrared modulation and control layer, a camouflage surface layer and the like are sequentially arranged on the surface of a substrate. For example, patent CN202510201697.7 discloses a class of radar-infrared multi-spectrum compatible stealth composites and methods for their preparation, which employ a multilayer structure to achieve superposition of different functional layers (but are not limited to such schemes). However, the above solution featuring simple physical stacking still has the following drawbacks in practical applications: the method comprises the steps of (1) poor matching of electromagnetic parameters and thermophysical properties of different functional layers, easiness in impedance mismatch, difficulty in realizing broadband and ultrathin performance in a limited thickness, easiness in remarkable attenuation of wave absorption performance under the condition of a large incident angle, difficulty in adapting to large-angle detection scenes such as side view SAR and the like, insufficient interface binding force between layers and limited environmental durability, and (3) large coating thickness and large surface density caused by multilayer superposition, and limitation of engineering application of the coating on an appearance and weight sensitive platform. In summary, although the multi-layer stack is an intuitive path for realizing multi-spectrum stealth, the prior art generally has the defects of poor performance cooperativity, insufficient environmental durability, excessively thick and heavy whole and the like, and the root of the multi-layer stack is lack of cross-scale and integrated cooperative design from electromagnetics, thermodynamics, material mechanics to technology. Therefore, a novel multilayer composite coating scheme is needed to be invented, which can realize efficient compatible stealth of visible light, infrared and broadband radar waves on the premise of ultra-thin (such as <1.5 mm), has excellent interlayer bonding force, environmental durability and wide substrate adaptability, and thus truly meets actual combat requirements of new-generation weaponry. Disclosure of Invention In view of the above problems, the present invention provides a multiband compatible stealth and camouflage integrated material and a preparation method thereof, so as to solve the following technical problems of the existing multiband stealth coating: (1) The problem that broadband radar stealt