Flame retardant wires and cables have unique flame retardant, low smoke emission and harmful smoke suppression properties. What flame retardant properties should AAC Cable materials have?
Type and performance of flame retardant wire and cable
1. General flame retardant wires and cables
Generally, the insulating layer and protective sleeve of flame-retardant wires and cables are generally made of polymer materials containing halogen bulbs (or modified materials added with halogen bulb flame retardant), and polyethylene (PVC) materials are common. The general PVC epoxy resin has higher electrolytic strength, acid resistance, wear resistance and anti-aging properties. The quality and cheap price of the epoxy resin become the raw material of AAAC Cable material which is in great demand in China. However, when PVC burns, hydrogen chloride, carbon monoxide, carbon dioxide, all kinds of fatty hydrocarbons, effective chlorine chemicals and other harmful substances will be released.
2. Low smoke halogen-free flame retardant wire and cable
Low smoke halogen-free cable flame retardant wire and cable can add inorganic nickel hydroxide flame retardant such as aluminum chloride and aluminum hydroxide to the insulating layer and protective wire sleeve materials. The basic principle of flame retardant is the basic principle of condensation phase flame retardant: the water released by the decomposition reaction of aluminum chloride and aluminum hydroxide, at the same time, digest and absorb the heat, reduce the specific temperature of insulating layer and protective wire sleeve materials, and inhibit the dissolution and release of combustible gases. The converted hydroxide is also a fireproof material, which is covered on the surface of the material to improve the working ability of the insulating layer and protective wire sleeve to resist fire, and has the purpose of blocking gas and blocking combustion. Aluminum chloride and aluminum hydroxide are the advantages of flame retardant: no poison, no evaporation, high quality and low price, flame retardant and destructed opium. However, the compatibility with the epoxy resin of the base material is poor. When it is used as a flame retardant, it must be added a lot to achieve a certain flame retardant grade. In addition, it is easy to reduce the forming process performance and structural mechanical properties of the material.
3. Low smoke halogen-free flame retardant wire and cable
Thermosetting polyurethane elastomer materials are often used for the insulation layer and protective sleeve of low smoke halogen-free flame retardant wires and cables. The materials do not contain halogen elements such as fluorine, chlorine, bromine and iodine. Mercury, chromium, cadmium, lead and other heavy metal elements that cause great environmental pollution to the natural environment are removed in the manufacturing process. Acrylic resin is often used. The flame retardant principle of this kind of ABC Cable is the flame retardant principle of final break interchange. Final flame retardant refers to taking away part of the calorific value caused by the combustion of flame retardant materials, resulting in that the materials can not maintain the decomposition reaction temperature, so it can not continuously cause flammable gases, so the combustion will extinguish itself. For example, when the flame-retardant material is subjected to strong heat or burning, it can melt, and when the molten material drops, it can take away most of the calorific value, resulting in slow combustion, which is likely to stop combustion.