What are the material characteristics of explosion-proof
The explosion-proof clothing contains a variety of high-performance fibers. The outer material of the explosion-proof clothing is made of high-strength coating fabric, which is environmentally friendly and non-toxic; the high temperature resistance, puncture resistance, impact resistance, energy absorption performance and resistance of each protective layer component The flammability must meet the relevant specifications. The internationally common explosion-proof clothing structure is divided into impact-resistant outer layer, bullet-proof and stab-resistant layer, flame retardant layer, waterproof and breathable layer, and heat insulation layer. The following XINXING police equipment will be introduced from the materials used in these five layers.
1. Anti-shock outer layer: The anti-shock outer layer can protect the sturdy outer layer of the explosion-proof suit against the energy of the overpressure shock wave, and at the same time, it can also resist the flying explosive fragments. The impact-resistant outer layer material mainly uses ultra-high molecular weight polyethylene fiber, which has good impact resistance, soft bending and wear resistance, strong energy absorption, and is one of the world's best high-performance fiber materials, which can achieve high quality 15 times of steel, it has the properties of softness, anti-piercing and armor piercing in explosion-proof clothing.
2. Bulletproof and stab-resistant layer: Although the shock-resistant outer layer can withstand the energy of some overpressure shock waves, the overpressure shockwave will still penetrate the solid outer layer and then contact the bulletproof and stab-resistant layer inside. This protective layer It can block the debris that penetrates the outer armor and has the effect of bulletproof and stab resistance. This layer of material mainly uses aramid fiber, which has higher strength than carbon fiber, lighter weight than glass fiber and carbon fiber, low thermal expansion coefficient, and good fatigue resistance. And the density is 1/5 of the steel wire, the strength is 5 times of the steel wire, can maintain the stable size and performance in the range of -192 ~ 182 ℃, will not burn will not melt, this material has a high strain rate sensitivity Sexuality, that is, it can become harder as the impact speed increases.
3. Flame retardant layer: Pyrex fiber (PSA), that is, polysulfone amide fiber, which is polymerized by terephthaloyl chloride, diaminodiphenyl sulfone and diaminodiphenyl sulfone, and dissolved in dimethyl Acetamide is then processed by wet spinning or dry spinning. It has excellent heat resistance and plays a good flame retardant effect in explosion-proof clothing.
4. Waterproof and breathable layer: The waterproof and breathable layer is to prevent the entry of corrosive liquid or hot air at the explosion site, and is usually a coating or a waterproof fabric. In addition, the explosion site has high temperature, high heat, and a large amount of human sweat. If the explosion-proof suit is not breathable, it will make the human body feel hot and suffocate, which will seriously affect the combat effectiveness. The current solution to this problem is to use a flame-retardant composite microporous tetrafluoroethylene film. The microporous tetrafluoroethylene film itself is resistant to high temperatures and can block the passage of water and expel sweat vapors smoothly.
Fifth, heat insulation layer: According to the data, the temperature of the explosion site is high, so the explosion-proof clothing should have good heat insulation performance, including heat conduction performance against direct burning and penetration performance against radiant heat. The thermal decomposition temperature of PBO fiber can reach 650 ℃, which is the fiber with the highest thermal stability. It has a good defense against the high energy and high temperature encountered by the explosion, and can play a role in isolating the heat.