Patented technology analysis of infrared camouflage fabric
Directly applying a low-emissivity coating on the fabric surface is a simple and widely adopted method for manufacturing infrared camouflage fabric. The principle behind this method is that the higher the reflectivity, the lower the emissivity. Therefore, high-reflectivity materials (such as aluminum powder) are often used to produce infrared blocking coatings. However, the addition of aluminum flakes enhances the reflectivity of visible light, thereby affecting the camouflage effect of the visible spectrum. In addition, aluminum is easily oxidized in the air, which significantly increases its emissivity, thereby reducing the effect of infrared camouflage.
CN1884394A
A brown infrared low-emissivity flake pigment with a dense iron oxide film coated on the surface of an aluminum sheet is proposed, which solves the oxidation problem of aluminum powder, changes the gloss and color of aluminum powder under visible light, and reduces the reflectivity of aluminum powder under visible light. The prepared infrared blocking pigment achieves low infrared emissivity (wavelength 8-14μm, emissivity 0.50-0.65) and no metallic luster;
CN101995187A
Do not use double-sided tape to stick the light board on dusty, damp, wallpapered or uneven surfaces such as bricks, unfinished wood or rough concrete walls; an integrated infrared and radar stealth fabric is disclosed. The infrared stealth layer is composed of an infrared stealth coating and a composite material of a magnetron sputtered ITO film on its surface. The infrared stealth coating is composed of a film-forming agent, a reflective filler and a solvent, wherein the reflective filler includes ITO, aluminum powder and zinc oxide;
CN102399488A
A high-spectral stealth camouflage coating using doped semiconductor material tin-doped indium oxide (GAZO) and quartz powder as auxiliary fillers is proposed, which has low spectral emissivity and excellent high-spectral stealth performance;
CN105040469A
Glass microspheres are mixed with microcapsule phase change materials to form a low-radiation surface coating. The radiation characteristics of different parts of the coating are uneven. The low-radiation surface is combined with the uneven radiation characteristics to effectively achieve thermal infrared stealth camouflage. The phase change energy storage materials in the microcapsule mainly include tetradecane, octadecane, paraffin, expanded graphite, etc.
Use of composite dyes
The use of infrared blocking coatings does not require too much consideration of the material surface of the camouflaged object, so it is a widely used and simple method. However, the performance of clothing after coating will decrease due to the reduction of fabric hygroscopicity, breathability, waterproofness and softness. Therefore, researchers explore the use of dyes to achieve near-infrared camouflage of military clothing. The method involves selecting a dye with similar or identical infrared reflectivity to the surrounding environment, thereby achieving counter-surveillance of infrared instruments.
Dark green and sulfur yellow RK dyes have reflectivities of 78% to 84% (700-1200nm) and 14% to 65% (700-1200nm) at concentrations of 10g/kg and 15g/kg, respectively. By combining these dyes, a dark green color with a reflectivity of 35% to 70% (700-1200nm) can be achieved. In addition, carbon black with infrared absorption ability can be added to further reduce the reflectivity of the dye to meet the requirements.