Fire protection principle of fire retardant coating

Principles of fire protection of fire retardant coatings 

Slim Slim

The principle of fireproof and heat insulation of ultra-thin or thin steel structure fireproof paint coated on steel structure is that the fireproof paint layer expands and foams when it is exposed to fire, forming foam, foam The layer not only isolates oxygen, but also has good thermal insulation properties because of its loose texture, which can delay the speed of heat transfer to the protected substrate; The expansion shows an endothermic reaction, and it also consumes the heat during combustion, which is beneficial to reduce the temperature of the system.

Thick structure

The principle of fire protection and heat insulation of thick steel structure fire retardant coatings coated on steel components is that when the fire retardant coating is exposed to fire, the volume of the coating does not change substantially, but the thermal conductivity of the coating The rate of fire is very low, which delays the speed of heat transfer to the substrate to be protected. The coating of the fire retardant coating itself is non-combustible, which acts as a barrier to the steel components and prevents heat radiation, preventing the flame and high temperature from directly attacking the steel components. In addition, the process of some components in the coating reacting with each other to generate non-combustible gas is an endothermic reaction, which also consumes a lot of heat, which is conducive to reducing the temperature of the system, so the fireproof effect is remarkable, and it has an efficient fireproof and heat insulation for steel. Protect. In addition, this type of fireproof coating for steel structure does not change in volume when it is exposed to fire to form a glaze-like protective layer, which can isolate oxygen and prevent the oxygen from being in contact with the flammable substrate that cannot be protected, thereby avoiding or reducing the combustion reaction. However, the thermal conductivity of the glaze-like protective layer generated by such coatings is often large, and the thermal insulation effect is poor. In order to achieve a certain fire and heat insulation effect, thick-coat fire-retardant coatings generally have thicker coatings to achieve certain fire-proof and heat-insulation performance requirements