Paint common sense: Unscrambling the secrets behind seemingly simple spraying

Core tip: spray coating can prevent explosion and burn of human body Recently, a new scientific and technological discovery can help people better protect "face" in extreme environment, and this kind of "Golden Bell mask" of spraying material is very bright The reporter visited relevant experts to solve the secret behind the seemingly simple spraying Tu Yi Tu: New camouflage coating Explosion and burn resistant Capable of withstanding 600 ℃ instantaneous explosion and high temperature Recently, researchers at the University of South Mississippi received funding from the U.S Department of Defense Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces Each ceramic piece has raised characteristics Under general conveyor belt pressure, thousands of unique cast bumps can produce positive traction, prevent slipping and extend the service life of conveyor belt roller At the same time, the bottom layer adopts high-quality rubber, which has strong elasticity and can play a good impact resistance role The scope of application of roller ceramic coating is one three six 83857180 (the same as V) 1 Roller coating in extremely harsh working environment 2 The belt joint is not suitable for fixing with iron buckle; 3 It is suitable for leather Paint Home News: spray coating, can make the human body prevent explosion burns Recently, a new scientific and technological discovery can help people better protect "face" in extreme environment, and this kind of "Golden Bell mask" of spraying material is very bright The reporter visited relevant experts to solve the secret behind the seemingly simple spraying Apply one coat: the new camouflage coating can prevent explosion and burn, and can withstand the instant explosion temperature of 600 ℃ Recently, researchers from the University of South Mississippi in the United States received funding from the U.S Department of defense to develop a new face camouflage coating for U.S soldiers The coating can help soldiers' faces resist the instant heat wave generated by the explosion of the bomb, and protect their faces from burns The traditional camouflage paint used in the battlefield is only for concealment, which can let soldiers escape from the enemy's vision, but can not help them resist the deadly high temperature of 1112 degrees Fahrenheit (600 degrees Celsius) brought by roadside bombs What's worse, the lubricants and other greases in camouflage paint will be added to the fire, providing more fuel for combustion, leaving soldiers' faces nowhere to escape under the fire Dr Robert Lockhead of the University of South Mississippi first presented the thermal camouflage coating invented by him and his research team at the annual meeting of the American Chemical Society held in Philadelphia, calling it a safer alternative to traditional camouflage coating with thermal shielding function "An explosion of a roadside bomb, or any other powerful explosion, usually creates two dangers: first, a high-pressure shock wave propagating at supersonic speed, which may cause catastrophic internal injury; and on the other hand, an almost instantaneous thermal explosion, which has a temperature of more than 600 ℃, enough to burn a cigarette," said Dr Lockhead Although the thermal explosion lasts only 2 seconds, it can almost 'cook' the face, hands and other exposed skin " The new camouflage coating on the face and hands can protect the applicator from 600 ℃ in 15 seconds 15 seconds seems short enough to save lives on the battlefield According to reports, in some tests, the camouflage coating can even provide 60 seconds of protection Fireproofing can also prevent mosquitoes from being used conveniently, such as "Mask" Dr Rock Haide said at the meeting that this camouflage material must meet several key requirements: it can not only reflect intense heat, but also provide color for camouflage during the day or night In addition, it must be easy to apply and remove, waterproof and non irritating to eyes, nose and mouth It's not easy to balance these points In an interview, Professor Mai kancheng of the school of chemical engineering of Sun Yat sen University explained several difficulties of this technology in a simple way "The base material of traditional camouflage coating is usually hydrocarbon polymer, which is easy to burn when encountering high temperature The substrate of the new coating is a non flammable silicon containing substance This kind of silicon-containing material can replace the traditional hydrocarbon polymer to achieve the smoothness and coating performance of the coating, as well as the function of fire prevention and heat insulation " He said He analyzed that the silicon containing material may be organosilicon "Now, silicone is the main filling material for beauty and breast enhancement Organosilicon is non-toxic, non irritant, high temperature resistant and flame retardant If you want to be easy to smear and remove and be waterproof, I guess it will be very much like some mask used by ladies now, and it will become a layer of paint If you want to remove it, tear it down " Because it is used for soldiers in the field, camouflage coating is also required to have the effect of repelling mosquitoes, which undoubtedly increases the difficulty In order to make the camouflage coating take into account the function of insect repellent, it needs to add insect repellent, i.e DEET, but the biggest problem is the flammability of insect repellent, which is very difficult to take into account Dr Lockhead said: "DEET is flammable and we don't think we can do it when the mod asks for it." But eventually, impenetrable defence was added to the research team: a golden bell was added to the flammable mosquito repellent, which was wrapped in water rich gel, which was perfectly prepared by the US military How can the camouflage coating effectively block the large amount of heat generated during explosion? It is a difficult point to find a suitable filling material to reflect the heat Traditional camouflage coatings use nanoscale pigments that maximize visible light reflection - which is why they often look green or dark brown But one problem is that these nanoparticles can't reflect light waves with longer wavelengths, such as infrared rays that bring heat Reflecting these light waves requires larger dye particles Therefore, according to the data, the researchers who developed the camouflage coating mixed those nano scale dye particles into those large sand particles to reflect the heat radiation to the greatest extent Only in this way can the silicone mask be maintained in the temperature range of human body at the instant of explosion and high temperature all around Mackenzie pointed out that at present, in the field of building materials, there are fire-resistant plates, but in the field of coatings with only one thin layer, the current application is mainly to play the role of thermal insulation in buildings The base material of thermal insulation coating used in the field of building is mainly hydrocarbon polymer, which is not resistant to high temperature, not to bear the high temperature state achieved in such an instant as explosion "Firemen's Fire-proof clothes are made of thick materials because they need to contain flame retardant It's hard to be able to withstand high temperature for a long time when the texture is very thin " Mackenzie said Therefore, although Dr Lockhead thinks that his invention can be used not only by soldiers but also by firefighters, Mackenzie believes that the coating can only resist the high temperature formed by instant explosion and can not withstand the high temperature baking for a long time Therefore, the foreseeable application of this kind of coating will be relatively narrow Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,