Fireproof and heat insulation principle of steel structure fire retardant coating

The fireproof and heat-insulating principle of the intumescent steel structure fire retardant coating:
The principle of fire protection and heat insulation of intumescent steel structure fire retardant coatings coated on steel structures is that the fire retardant coating layer expands and foams when exposed to fire, forming a foam. The foam layer not only isolates oxygen, but also has good heat insulation because of its loose texture. Performance, it can delay the speed of heat transfer to the protected substrate; according to the analysis of physical and chemical principles, the process of the foam layer produced by the expansion and foaming of the coating shows an endothermic reaction due to the expansion of the volume, which also consumes the heat during combustion, which is beneficial to Lowering the temperature of the system, these functions enable the fire retardant coating to produce significant fire retardant and heat insulation effects.

Fireproof and heat insulation principle of non-expansive steel structure fire retardant coating:
The principle of fire protection and heat insulation of non-expandive steel structure fire retardant coatings coated on steel components is that the coating basically does not change in volume when the fire retardant coating is exposed to fire, but the thermal conductivity of the coating is very low, which delays the transfer of heat to the substrate. The speed of the material, the fire retardant coating itself is non-combustible, it acts as a barrier to the steel components and prevents thermal radiation, preventing flames and high temperatures from directly attacking the steel components. Some components in the coating react with each other when exposed to fire to form non-combustible materials. The process of gas is an endothermic reaction, which also consumes a lot of heat, which is conducive to lowering the system temperature, so the fire prevention effect is significant, and it provides efficient fire protection and heat insulation protection for steel. In addition, this type of steel structure fire retardant coating will be coated when exposed to fire. There is no volume change to form a glaze protective layer, which can isolate oxygen so that oxygen cannot be contacted by the protected flammable substrate, thereby avoiding or reducing the combustion reaction. However, the thermal conductivity of the glaze protective layer generated by this type of paint is often Larger, poor heat insulation effect. In order to achieve a certain fire protection and heat insulation effect, thick-coated fire retardant coatings generally have thicker coatings to achieve certain fire protection and heat insulation performance requirements.