Indoor thick steel structure Fire retardant coating How much is a bag? How much is a bag
Indoor thick steel structure fire protection coating One bag of quotation, one bag of thick steel structure fireproof coating produced by our company weighs 25kg, one bag of fireproof coating is sold in batches, and indoor thick steel structure fireproof coating It is made of light fire-resistant, thermal insulation materials and modified inorganic * * * temperature adhesive It is applied to the surface of indoor and outdoor steel structures to form a fire-resistant and thermal insulation protective layer. In case of fire, it can prevent the rigid strength of the bearing column from dropping due to the temperature of * * * *. It plays the role of fire protection and thermal insulation. It has the advantages of fire resistance * * * and long fire resistance time. Due to low density, small volume consumption; It has strong cohesive force and good construction workability; The acid and alkali resistance is good, and the steel structure is usually protected from the erosion and weathering of environmental factors, and is not prone to pulverization. Thick section steel
Fire and heat insulation principle of structural fire retardant coating:
The fire and heat insulation principle of thick steel structure fire retardant coating applied on steel members is that the coating basically does not change in volume when the fire retardant coating is exposed to fire, but the thermal conductivity of the coating is very low, which delays the speed of heat transfer to the protected base material. The coating of the fire retardant coating itself is incombustible, acts as a barrier to steel members and prevents thermal radiation, and avoids the direct attack of flame and temperature on steel members . In addition, some components in the coating react with each other when encountering fire to generate incombustible gas, which is an endothermic reaction and also consumes a lot of heat, which is conducive to reducing the system temperature, so the fire prevention effect is significant, and it can provide fire and heat insulation protection for steel . In addition, this kind of fireproof coating for steel structure will not change in volume when exposed to fire to form a glazed protective layer, which can isolate oxygen, so that oxygen can not be contacted by the combustible substrate that cannot be protected, thus avoiding or reducing combustion reaction . However, the thermal conductivity of the glaze protective layer generated by such coatings is often high, and the thermal insulation effect is poor . In order to achieve a certain effect of fire and heat insulation, thick coating fire retardant coatings can meet certain requirements of fire and heat insulation performance only when the coating is thick.
GB14907-2002 standard requirements
stay container Status in After mixing, the fireproof coating is in a uniform and thick fluid state , No caking.
Drying time (surface drying) ≤ 12h 4h
Initial drying crack resistance Allow 1-3 Strip crack , Its width should not be greater than zero point five millimeter
Bond strength MPa ≥ zero point one five
compressive strength MPa ≥ zero point zero five
Freeze thaw cycle resistance , Times ≥ fifteen The coating shall be free from cracking, peeling and blistering
Fire resistance Coating thickness 23mm Fire resistance is greater than 3.0h
Heat exposure resistance ≥ 720h The coating shall be free of delamination, peeling, hollowing and cracking
Indoor thick fireproof coating construction technology
1. Mechanical spraying, brush coating, roller coating and other construction methods can be used for fire retardant coating of thick steel structure in NH room.
2. The surface of steel structural members shall be derusted and treated for rust prevention and corrosion prevention.
3. Before construction, the dust, grease, moisture, etc. on the surface of steel structure components shall be cleaned up. It is strictly prohibited to paint on wet surfaces.
4. Before use, the product must be fully mixed evenly. It can be diluted by adding appropriate amount of water according to the construction conditions. Excessive amount will affect its performance.
5. During construction, the thickness of each coat is about 2-7mm. The next coat shall be applied after the coat is dry. The thickness of each coat is about 5-10. There shall be no holidays in each coat. The interval between each coat is 8-24 hours. The thickness of the coat meets the design requirements.
6. The construction environment temperature should be between 5~35 ℃, the relative humidity should not be more than 80%, and the air should be well ventilated. When the wind speed is greater than 5m/s, rainy days or component surface is dewed, construction is not suitable.
7. After construction, the coating shall be protected from rain, immersion and long-term moisture, and can meet its performance requirements after curing.
