The fire-resistant coating's fire-resistant principle can be roughly summarized into the following five points:
The fire-resistant coating itself is non-combustible, preventing the protected base material from coming into direct contact with oxygen in the air.
Fire-resistant coatings have a lower thermal conductivity, slowing the rate of heat transfer to the base material.
The fire-resistant coating releases non-flammable inert gases upon heating, diluting the flammable gases emitted by the protected object, making it less likely to ignite or burn at a slower rate.
Nitrogen-containing fire-retardant coatings decompose upon heating to release groups such as NO and NH3, which then react with organic free radicals, breaking the chain reaction and reducing temperature.
⑸ The expandable fire-resistant coating expands and foams when heated, forming a carbonaceous foam insulation layer that seals the protected object. It delays the transfer of heat to the base material, preventing the object from catching fire and burning or experiencing a decrease in strength due to temperature rise.
