Non-intumescent fire retardant

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Non-intumescent fire retardant mechanism Coatings Non-intumescent fire retardant coating fire play a major role in two ways: ① coating itself is flame-retardant or nonflammable; ② flame or high temperature decomposition in non-flammable gases (such as water vapor, ammonia, carbon dioxide etc.) in order to dilute the concentration of oxygen in the air, and the formation of a dense structure nonflammable "enamel layer" to achieve the purpose of isolation from the air. This process is an endothermic reaction, it can consume a large amount of heat, help to reduce the temperature of the system.

Fire retardant paint in the low density refractory inorganic material deposition or hollow microspheres formed low thermal conductivity of insulating fire-retardant coating, play a good fire insulation effect. 2.2 intumescent fire retardant coating mechanism Intumescent fire retardant coating film after, at room temperature, no different from ordinary film. However, in a flame or heat, coating severe charring foam, forming a thick film than the original several times or even hundreds of times the carbon layer of flame retardant foam.

It can be isolated from outside sources of ignition direct heating of the substrate, play a flame retardant. When coating charring expansion, increasing the coating thickness several times or even a hundred times, and the thermal conductivity of the coating is on the decline, and finally transferred to the substrate by thermal expansion of the carbon layer is only a few one-tenth of the original coating of even almost one percent, the substrate can be better protected. From a macro point of view, the formation of carbonaceous layer acts contribution to fire four aspects: ① cut off direct flame heating of the substrate; ② physical change soften the coating, melt, swelling, etc., and polymers, fillers, additives chemical action of decomposition, evaporation and carbonization will absorb a lot of heat; ③ cut off contact with the substrate and air; ④ the decomposition of non-combustible gas can dilute the concentration of oxygen in the air. In the fire-resistant coating, the fire performance of intumescent fire retardant coating is usually superior to the non-intumescent fire retardant properties.

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