First, the working principle of fire retardant coatings
1, the flame retardant coating itself has fire resistance or incombustibility, so that the protected substrate does not directly contact with the air, delaying the ignition of the object and reducing the combustion speed.
2. In addition to its flammability or nonflammability, the fireproof coating has low thermal conductivity, which will delay the transfer of flame temperature to the protected substrate.
3. Flame-retardant coating is to dilute the combustible gas decomposed by heat to make it difficult to burn or slow down the combustion speed by using the inert gas which is not flammable by heat decomposition.
4. Nitrogen-containing flame retardant coatings thermally decompose NO, NH3 and other groups. Combine with organic free radicals, interrupt the chain reaction and lower the temperature.
Second, how to choose fire retardant coatings
1, check the fire resistance of fire retardant coatings.
It is required to check the fire resistance of the coating when purchasing. Intumescent fire retardant coatings will bubble and expand a lot when burning in strong fire, and the surface will gather and bulge, and there will be no burning loss in a few minutes, while fake and shoddy fire retardant coatings will basically not bubble, and a large amount of slag will be scattered, and the wood substrate will be burned quickly.
2. Understand the combustion performance of fire retardant coatings.
According to the national standards, the combustion performance of fire retardant coatings can be divided into first-class and second-class besides meeting the fire resistance requirements. Under the specified experimental conditions, the fire resistance time of the first-class fire retardant coating is not less than 20 minutes, and the heat resistance time of the second-class fire retardant coating is not less than 10 minutes. Users should pay attention to the distinction when choosing, to prevent enterprises from shoddy and failing to achieve fire fighting effect.
Don't be greedy and cheap when buying products.
At present, domestic enterprises produce fire-retardant coatings with secondary fire-retardant performance, and the cost price is more than 8000 yuan/ton. If the sales price is lower than this, the quality is worrying. So you can't be greedy and cheap when buying, otherwise you will buy products with unqualified quality and environmental protection.
To sum up, the above is the working principle and purchasing skills of fire retardant coatings shared by Bian Xiao today. I hope the above content is useful to you.