The protective and thermal insulation principle of thick steel structure fireproof coating applied on steel components is that when the fireproof coating is exposed to fire, the coating basically does not change in volume, but the thermal conductivity of the coating is very low, which delays the speed of heat transfer to the protected substrate. The coating of fireproof coating itself is non combustible, acting as a barrier and preventing thermal radiation to the steel components, avoiding direct attack of flames and high temperatures on the steel components. The process of some components in coatings reacting with fire to generate non combustible gases is endothermic and consumes a large amount of heat, which is beneficial for reducing the system temperature. Therefore, the fire prevention effect is significant and provides efficient fire and insulation protection for steel. In addition, contact with flammable substrates that prevent oxygen from being protected can avoid or reduce combustion reactions. However, the thermal conductivity of the glaze like protective layer generated by such coatings is often high, and the insulation effect is poor. In order to achieve certain fire and heat insulation effects, thick coating fireproof coatings generally require a thicker coating to meet certain fire and heat insulation performance requirements.
