Flame-retardant cables for mines can delay the spread of flame along the cable so that the fire will not expand to the point where it cannot be grasped. Due to the low cost of manufacturing this cable, it is a large number of cable varieties used in fire-resistant cables. Whether it is a single cable or a bundle laying condition, the flame spread can be controlled within a certain range when the cable is burned. Therefore, It can avoid major disasters caused by cable fire and prolonged combustion, thereby improving the fire protection level of cable lines.
The oxygen barrier flame retardant technology is mainly to fill a layer of inorganic metal hydrate between the cable insulated core and the cable outer sheath. It is a non-toxic, odorless, and halogen-free white glue. The oxygen barrier flame-retardant cable can be applied to low, medium and high-voltage power cables, control cables and communication cables without changing the cable structure and the original parameters of the material, and makes the cable flame-retardant Class A. Compared with halogen-containing flame-retardant cables, halogen-free flame-retardant cables have the advantages of low toxicity, low smoke and halogen-free. The flame retardant level is not high, basically it is C class. The reason is that the energy efficiency of oxygen swallowing fire extinguishing by halogen free radicals is greater than the energy efficiency of non-halogen flame retardant degradation temperature. Flame-retardant cables are self-extinguishing while maintaining the electrical and physical and chemical properties of ordinary cables, that is, they are not easy to burn, or when the cable is on fire for some reason or an external source of fire ignites, the cable will not continue after the fire is extinguished. Burning, or the burning time is very short (within 60 minutes), or the extended burning length is very short.
The principle of flame-retardant cables for mines is that flame retardants are added to the insulation materials and sheath materials of the cables. Under the heat of the combustion reaction, the flame retardant in the condensed phase decomposes and absorbs heat, so that the temperature in the condensed phase rises and decreases. Slow, slow down the thermal decomposition rate of the material; after the flame retardant is thermally decomposed, the chain reaction free radical cable is released, which interrupts the flame and the branch of the chain reaction, and slows down the gas phase reaction speed; catalyzes the thermal decomposition of the condensed phase and the solid phase product, coking The formation of the layer or foam layer strengthens the effect of these layered hard shells in hindering heat transfer; under the action of heat, the flame retardant undergoes an endothermic phase change, which physically prevents the temperature rise in the condensed phase. The characteristic of flame-retardant cable is to delay the spread of flame along the cable so that the fire will not expand. Because of its low cost, it is a large number of cable varieties used in fire-resistant cables. The flame-retardant mine cable is known to control the spread of the flame within a certain range when it is burned, whether it is a single cable or a bundle. Therefore, the flame-retardant mine cable can avoid major disasters caused by fire and prolonged combustion. , So as to improve the fire protection level of the cable line.