Chemical code at the parade

on the morning of October 1st,, a military parade to celebrate the 70th anniversary of the founding of the People's Republic of China was held in Beijing's Tiananmen SquareSand field point soldiers, the three army will be a big step, camouflage chariots rumbled forward, aircraft formations whizzing past ..The People's Army, with its mighty military appearance, showed the world the country's military strength and the achievements of military science and technology developmentAt the parade, all kinds of military equipment dressed in camouflage function of the "invisible combat suit" on stage, become a powerful scenerySo do you know the chemical code for these "war wear"? Let's take a look at it's "stealth combat suit"camouflage clothing is the "second layer of skin" of soldiers, is the soldier's robe and armor, is an important symbol of the image of the army and soldiersAt this military parade, 31 teams of military parade officers and soldiers dressed in a new "star" camouflage clothing appearance, attracted everyone's attentionIt is understood that this camouflage clothing flower color for the new design, compared with the past camouflage pattern more fine, and with the ground light changes, color will also produce subtle adjustments, concealment, anti-detection performance betterat present, the latest camouflage clothing in addition to the use of color changes to form a protective color pattern, but also in the color dye to add photochromic polymer materials and other special chemicals, so that camouflage clothing reflected infrared light waves and the surrounding scene reflected light waves are about the same, not only to confuse the enemy's naked eye reconnaissance, but also to make the enemy's modern detection instruments difficult to capture, with a certain anti-infrared light detection effectHow does the photochromic polymer material achieve the discoloration function? Simply put, the chemical structure of this polymer icing material under the action of light or other electromagnetic waves will change some reversible, and color changes will occur accordingly from the appearancePhotochromic polymer material is a large family, according to the nature of the reaction can be divided into photoisomereaction reaction class, such as -metformin-based azobenzene, photodifferentiation reaction class, such as double-tribenzene, etc., photooxidation recovery reaction class, such as sulfur and purpleAt first, this material is mainly used in high-tech fields such as optical information storage, and then gradually applied to military, anti-counterfeiting and other fieldsThe camouflage suit with photochromic polymer material has the characteristics of three-dimensional layer, multi-color gradient, visual illusion and so on, and can adapt to the camouflage needs of various terrains such as woodland, desert, city or combat background with mixed terrain characteristicsin actual combat, special forces fighters not only wear camouflage clothing, but also paint their faces with camouflage paintThis is because when the soldier is concealed, it is easy to be exposed by the light reflected by the exposed skin, and after applying military camouflage oil color, the skin tone is coordinated with the main color of the surrounding environment to avoid enemy reconnaissanceThis military camouflage oil color is made of special chemicals, the paste is delicate, stable, insoluble in water, non-toxic and non-irritating to the skin, with excellent coating, cover and adhesionMoreover, some military oil color adds special chemical components, in the camouflage skin color at the same time has the effect of mosquito bites, and some military oil color added special chemical materials to protect soldiers from the explosion of high temperature burnsthe chariots of the "stealth combat suit"the three generals to wear "stealth combat clothing", tanks, military vehicles and other large-scale military equipment to wear "stealth combat clothing." These military equipments are sprayed with camouflage camouflage coatings made of special chemical materials and can adapt to the hidden needs of a variety of environmental backgroundsThe main purpose of camouflageis to minimize the differences between military equipment and surrounding background in optical, thermal infrared, radar wave and so on, reduce the probability of detection, make reconnaissance instruments difficult to detect and distinguish, is to improve the use of various weapons and equipment, self-protection of an important military camouflage methodGenerally speaking, camouflage camouflage coating to meet the color and background consistent, reflective spectrum and background consistent, no light or flat light, weather resistance, wear resistance, good chemical resistance and other functional requirementsat present, China has adopted a new digital camouflage camouflage coating, its raw materials by the base materials, pigments and auxiliary materialsBase materials commonly used are butyl rubber, neoprene, butyl rubber, polyibutene, pvc, polyurethane, etc, pigments generally by magnesium oxide, iron oxide, zinc oxide and other metal oxides, and tobacco black, graphite, carbon black, scaly aluminum powder and other conductive materials, auxiliary materials are some of the physical mechanical properties to improve and improve the coating, construction properties, surface status and other special materialsthis digital camouflage coating, combined with digital camouflage technology, further enhance the camouflage color type, color coordinates and visible light, near-infrared brightness factor and other aspects of performance, not only to further improve the camouflage performance, but also the chemical performance and practicality of the coating can also be greatly improved, with the role of preventing toxic agent penetration, can be said to represent the highest level in the field of chemical coatings todayfighter's "stealth combat suit"soldiers and chariots fighting on land need to be camouflaged, as do fighters flying in the skyThe principle of "stealth" of fighter aircraft is to use various technologies to reduce radar reflectors, infrared radiation and other information, so that enemy radar and other electronic detection systems "invisible."to be precise, the "stealth" of the stealth fighter is only for radar and other electronic means of detection, and is not really invisible to the naked eyeIn the anti-radar detection, the stealth fighter mainly takes anti-radar camouflage coating, which is a coating that absorbs electromagnetic waves, mainly using doped conductive coating, that is, in the adhesive mixed with specially treated metal oxides such as ferrite When the radar wave meets this chemical coating containing ferrite, through the change of chemical properties such as magnetic, electrical, light and activated area, increase the magnetic loss, play the role of absorbing wave, through the wave and making the wave polarization, so that the warplane can escape the radar wave tracking, to achieve the goal of invisibility In addition to ferrite, anti-radar coatings also include niobium-based iron, metal ultrafine powder, ceramics, radioisotopes, conductive polymers, Sifalkali, rare earth elements and other absorbent materials anti-infrared detection capability is another stealth function of stealth fighter In fact, all objects are always emitting infrared radiation, and the higher the temperature of the object, the stronger its infrared radiation Infrared detectors are made from this characteristic of infrared light The infrared radiation of the aircraft is mainly concentrated in the engine, the stealth fighter in the engine outside coated with ultra-high density carbon absorbent material, can absorb radar waves, but also control the heat emitted from the engine, thus escaping the search of infrared detector, so that the aircraft hidden invisible warships "stealth combat suit" the Air Force has stealth fighters, the Navy also has stealth warships Stealth warships appeared slightly later than stealth fighters, initially transplanting stealth fighter stealth technology into warships Stealth warship stealth technology, in addition to the stealth fighter to do radar stealth and infrared stealth, but also to take noise reduction and vibration stealth technology because the ship itself has many vibration sources, and in the course of navigation will be excited to produce strong vibration, resulting in a greater noise The use of vibration reduction and noise reduction technology to reduce ship noise, can improve the ship's concealment and attack and defense capabilities The noise-cancelling stealth technology of stealth warships is achieved by controlling the sound and frequency characteristics of warships to reduce the detection distance and accuracy of enemy sonar systems At present, the warships in the navy of various countries are more diesel engines, the work noise is too loud, it is easy to be detected by enemy submarines Stealth warships design edwars rubber "coats" for the engine to eliminate the noise of the engine and achieve the goal of noise reduction and stealth in the vibration reduction vibration, the previous use of rubber damper, but because of its low vibration isolation performance, narrow carrying range and other problems in recent years gradually replaced by polyurethane dampers Using the excellent dynamic static performance and good environmental resistance of polyurethane material, a large number of ship polyurethane materials have been developed internationally, mainly used to reduce the vibration of equipment and maintenance stability of in-ship vibratory products Polyurethane damper damping is smaller than, most of the conditions of vibration isolation effect is good, and adaptable, whether it is vibration frequency, amplitude or fatigue number of effects are smaller than the rubber damper In terms of silence tile, polyurethane muffler softer has a polymer material with acoustic structure, which can absorb the detection sound waves from the enemy's active sonar, but also resist the outward spread of the hull noise, reducing the probability of being detected by sonar These chemical materials have become an effective means of noise reduction and vibration reduction of submarines, which greatly improves the concealment, combat effectiveness and survivability of naval equipment these different forms of "stealth warfare" are just the tip of the iceberg in the application of chemical materials in military equipment in fact, chemistry is everywhere in the military field, and the application of black powder and explosives is a sign of mankind's entry into the era of thermoweapons now, chemical science has penetrated into all fields of the military, it can be said that the development of military science and technology is closely related to chemistry