The following are the three fire protection principles of membrane structure, I hope to bring you some help!

1. Catalyst
Catalyst is a substance that can decompose phosphoric acid under certain conditions, and the decomposed acid dehydrates the polyol, so that it forms a carbonization layer with a non-flammable three-dimensional spatial structure. Generally, the water solubility of melamine phosphate is smaller than that of polyphosphate, and it has both catalytic and foaming effects, and melamine phosphate is mainly used as a catalyst.

2. Carbon-forming agent
The carbonizer is the material basis for the coating to form a non-flammable three-dimensional space structure foam carbonization layer at high temperature, and plays a skeleton role for the foam carbonization layer. The carbonogenic agent should match the catalyst in terms of decomposition temperature, and when polyphosphate amines are used as catalysts, high-carbon polyhydroxy compounds with high thermal stability are used as carbon agents. However, its disadvantages are large odor during construction, easy aging of coating, starch and so on. The use of starch as a carbon agent, the water resistance of the coating is not easy to solve, and pentaerythritol is rarely used in China due to its price, and pentaerythritol is widely used as a carbon-forming agent for fireproof coatings in China.

3. Foaming agent
Intumescent fire-retardant coatings can only produce an expansion layer under a high-temperature flame under the action of a blowing agent. The blowing agent decomposes when exposed to fire and releases non-combustible gases such as ammonia, water, carbon dioxide, hydrogen halide, etc., so that the coating foams and expands when it reaches the softening point, forming a sponge-like structure.