Name | Fire retardant coating for steel structure |
Synonyms | Steel structure fireproof coating Fire retardant coating for steel structure |
fire retardant coating for steel structure is actually a layer of fire retardant material painted on steel structure. In order to make the steel structure meet the fire prevention requirements, it is necessary to use thermal insulation and refractory materials to block the direct burning of the steel structure, reduce the speed of heat transfer, delay the time of temperature rise and strength weakening of the steel structure, etc. There are two principles of fire protection of fire protection coating for steel structure,
1, thick steel structure fire retardant coating, the main component is inorganic thermal insulation material, presents a granular surface, the density is small, the coating does not expand when heated, because it has good thermal insulation, so it is also called thermal insulation fire retardant coating. The fire prevention mechanism is to use the inherent good thermal insulation of the coating to prevent the transfer of fire heat to the steel, and form a dense glaze at high temperature, which can effectively isolate oxygen and reflect heat, delay the heating of the steel structure, and play a role in fire protection.
2, thin and ultra-thin steel structure fire retardant coatings, mainly composed of base material, dehydrating agent, carbonizer and foaming agent. The fire prevention mechanism is that when the temperature rises to a certain level, the dehydrating agent promotes the dehydration and carbonization of the polyhydroxy compound. Under the action of a large amount of gas released by the foaming agent, the coating expands, and the expansion multiple
there is no grade of fire retardant coating. The grade you mentioned may be the fire resistance (fire protection) grade of the building, generally including: first-level fire resistance (fire protection), second-level fire resistance (fire protection), third-level fire resistance (fire protection), and fourth-level fire resistance (fire protection). 1. secondary fire prevention is the majority.
1. indoor steel structure fireproof coating can be divided into: 1. indoor thin steel structure fireproof coating, 2. indoor ultra-thin steel structure fireproof coating, 3. indoor thick steel structure fireproof coating.
2. outdoor steel structure fire retardant coating can be divided into: 1. outdoor thin steel structure fire retardant coating, 2. outdoor ultra-thin steel structure fire retardant coating, 3. outdoor thick steel structure fire retardant coating.
1. Fireproof coatings should be rain-proof and moisture-proof during transportation and storage.
2. Fire retardant coating shall not be used when curing or caking occurs. The coating that has just been constructed shall be protected from rain.
3. if the coating thickens during use (not hardened for too long time), a small amount of water can be added and stirred evenly before reuse.
4. after spraying the coating, plastic cloth or other articles should be used to cover it, so as not to crack the coating due to strong wind and sunshine.
5. the parts that do not need to be sprayed should be covered before spraying. once pollution is caused, it should be cleaned immediately.
6. After the spraying tool is stopped, it should be cleaned immediately for reuse.
7. construction temperature: during the construction period and within 24 days after the construction, it is advisable to keep the temperature of the surrounding environment and steel components above 5 ℃. If this temperature condition cannot be met, other special measures should be taken to prevent the coating from freezing. When the wind speed is greater than 5 m/s, or when there is condensation on the surface of the component, it is not suitable for operation.
8. Fire retardant coatings have low initial strength and are easy to be damaged. Therefore, spraying should be carried out after the construction of the relevant steel structure