Patented Technology Analysis of Infrared Camouflage Fabrics
Using Infrared Blocking Coatings
Coating a fabric with a low-emissivity coating directly on its surface is a simple and widely adopted method for making infrared camouflage fabrics. The principle behind this method is that higher reflectivity leads to lower emissivity. Therefore, materials with high reflectivity, such as aluminum powder, are often used to produce infrared blocking coatings. However, the addition of aluminum flakes can increase the reflectivity under visible light, thereby affecting the camouflage effect in the visible spectrum. In addition, aluminum is susceptible to oxidation in air, which significantly increases its emissivity, thereby reducing the effectiveness of infrared camouflage.
CN1884394A
Introducing a brown infrared low-emissivity plate-shaped pigment with a dense iron oxide layer coated on the surface of the aluminum flakes. This innovation solves the oxidation problem of aluminum powder, changes its gloss and color under visible light, and reduces its reflectivity under visible light. The obtained infrared blocking pigment achieves low infrared emissivity (wavelength 8-14 μm, emissivity 0.50-0.65) and has no metallic luster;
CN101995187A
Do not use double-sided tape to fix the light panel on dusty, damp, wallpapered or uneven surfaces, such as bricks, unfinished wood or rough concrete walls; An integrated infrared and radar stealth structure is disclosed. The infrared stealth layer consists of an infrared stealth coating and a magnetron sputtered ITO thin film composite material on its surface. The infrared stealth coating consists of a film former, 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 introduced. This coating exhibits low spectral emissivity and excellent high-spectral stealth performance;
CN105040469A
Glass microspheres are mixed with microcapsule phase change materials to form a coating with a low emissivity surface, in which different parts of the coating exhibit different emissivity characteristics. This combination of low emissivity surface and uneven emission characteristics effectively achieves thermal infrared stealth camouflage. The phase change energy storage materials in the microcapsules mainly include tetradecane, octadecane, paraffin and expanded graphite.
CN102757676A
Nano-scale GAZO powder is prepared using gallium (Ga), aluminum (Al), gallium oxide (Ga2O3), aluminum oxide (Al2O3) and zinc oxide (ZnO), and further processed into low-emissivity nano coatings. These coatings can be applied to woven fabrics, knitted fabrics, non-woven fabrics or synthetic leather surfaces by digital printing, screen printing, scraping, spraying or dipping rollers. After drying or hot pressing, a fabric with infrared stealth capability is formed, which is suitable for making thermal infrared camouflage clothing, camouflage nets, and tents. They maintain the physical and chemical properties of the original products and are compatible with visible light, near infrared (wavelength 0.38-2.5 μm) and infrared (wavelength 8-14 μm) multi-spectral stealth without affecting the comfort when wearing.
CN102417771A
Introduced an infrared stealth coating with three different phase change materials with different phase change temperature ranges as the core material and melamine formaldehyde resin encapsulation as the wall material. These microcapsules are added to the infrared stealth coating through in-situ polymerization and act as temperature control materials to adjust the emissivity within a temperature range of approximately 10-60°C to achieve an infrared camouflage effect. This coating overcomes the challenges of low-emissivity infrared stealth materials being incompatible with visible light and radar bands, poor tolerance to contamination, and being susceptible to increased emissivity from dust and moisture, which can reduce the stealth effect.