The classification and flame retardant engine analysis of the finished fireproof coating

China Coatings Online News Information: Decorative fire protection coating is a new type of paint that combines decoration and fire prevention functions. When the fire-resistant coating is applied to the combustible substrate, it can usually play a decorative role, once a fire occurs, it can prevent the spread of the fire, to protect the substrate. Suitable for general industrial and civil buildings, high-rise buildings, hotels, cultural and entertainment venues, ancient buildings of wood structure materials, fiberboard, particle board, glass and steel products and other flammable materials, as well as cement walls, play a role in fire protection. Finish-type fireproof coating after film coating performance is stable, can use a variety of climatic conditions, so can be used throughout the country. Finished fire protection coatings can be divided into expansion fire protection coatings and non-expansion fire protection coatings. Let's introduce the flame retardant concept of finish-type fireproof coatings.
1, non-expansion fire protection coating flame retardant agent
non-expansion fire protection coating mainly through two ways to play the role of fire prevention:
1, is the coating itself flammable or non-combustible;
2, decomposition under the action of flame or high temperature to release non-combustible gases (such as water vapor, ammonia, hydrogen chloride, carbon dioxide, etc.) to dilute the concentration of oxygen in the air, and the formation of a dense structure of non-combustible "glazed layer", to achieve the purpose of isolating the air. This process is a heat-absorbing reaction that consumes a lot of heat and helps to lower the temperature of the system. Low density high-temperature inorgeable or hollow micro-ball material in the fire protection coating forms a low thermal conductivity thermal flame retardant coating, play a good fire insulation effect.
second, expansion-type fire-resistant coating flame retardant
expansion-type fire-resistant coating into a film, at room temperature and ordinary paint film is no different. But in flame or high temperature, the coating foams violently, forming a hard-to-burn foam carbonization layer that is dozens or even hundreds of times thicker than the original coating film. It can isolate the direct heating of the substrate by external fire sources and act as flame retardant. When the coating carbon expansion, the thickness of the coating increased dozens or even hundreds of times, while the thermal conductivity of the coating is decreasing, and finally through the expansion of carbon layer to the substrate heat is only one-tenth or even one-hundredth of the original coating, so that the substrate can be better protected. From a macro perspective, the formation of carbon layer on the role of fire prevention has four aspects of contribution:
1, the direct heating of the substrate
by the barrier flame
2, the softening of the coating, melting, expansion and other physical changes and polymers, fillers, additives decomposition, evaporation and carbonization and other chemical effects will absorb a large amount of heat
; In fireproof coatings, the fire resistance of expanded fire protection coatings is superior to that of non-expansion fire protection.
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