The thick steel structure fire retardant coating is made of special expanded vermiculite, inorganic cementation materials, fire retardant additives, high temperature resistant materials and composite chemical additives. The coating has excellent fire and heat insulation performance, and can be used as the fire protection layer of various building steel structures, tunnels, reinforced concrete beams, columns, walls and floors. Its fire resistance and physical and mechanical properties meet the requirements of GB14908-2002 Product details: serial number. goods. Technical indicators. Measurement results. 1. The state in the container. No caking, uniform and thick fluid. Uniform viscous fluid without agglomeration. 2. Drying time (dry), h. ≤24。  16.3. Initial dry crack resistance. Generally, there should be no cracks, 1-3 cracks are allowed, and the width should be ≤ 1mm. No cracks. 4. Bonding strength, Mpa. ≥0.04。  0.2。  5. Compressive strength, Mpa. ≥0.3。  0.6。  6. Dry density, (kg/m3). ≤500。  461. 7. Water resistance, h. ≥ 24h, the coating shall be free of delamination, blistering and peeling. eligible. 8. Resistance to cold and hot cycles (times). ≥ 15 times of coating shall be free from cracking, peeling and blistering. eligible. 9. Fire resistance. Coating thickness, mm. 25±2。  25. Fire resistance, h. ≥2。  3.1. Base course treatment: completely remove dust, oil stain and rust on steel before construction. Then, two coats of anticorrosive paint shall be applied to the steel parts, and the next process can be carried out only after no paint is applied. 2. Fire retardant coating construction: fire retardant coating construction can be divided into metal mesh and non metal mesh. (1) Fix the metal mesh with metal mesh: after the antirust paint is dry, cut the metal mesh according to the shape of the steel, fix it on the steel with steel bars, and then press the pre welded steel bars of the metal mesh with steel bars. The mesh shall be flat and kept about 1cm away from the steel surface. (2) Metal free engagement ratio: powder: water=1:1.1-1.2 (3) Spray (or apply) fire-retardant coating 1. Mix the fire-retardant coating in proportion, put the powder and water into the mixer, and stir for 5-10 minutes to form a uniform and thick fluid. 2 Spraying: special extrusion pump spraying system is required for construction. During spraying, the spray gun shall be perpendicular to the steel surface, with a distance of 0.4-0.6m, and the spraying pressure shall be kept at 0.4-0.6Mpa. 3 Coating: Similar to the traditional mortar coating method, it requires uniform thickness, compaction and flatness to avoid honeycomb, air conditioning and other defects. Construction requirements: the first layer is 5-6mm thick, and the next layer is 7-10mm thick until the design thickness is reached. Note: After the first layer is dry, the next layer can be applied. When no metal mesh is added, the thickness of the bottom layer shall not be less than 1cm.
(1) The mixed materials shall be used up within 30 minutes, and the construction temperature shall be above 5 ℃.
(2) Avoid strong vibration and violent impact within two weeks after construction to ensure coating quality.
(3) When the steel section is too large, metal mesh must be added even if the rubber base is used. matters needing attention
1. The bagged coating must be moisture-proof and rainproof. It should be stored in a dry and ventilated place for no more than 6 months. If the bagged coating is sticky or frozen, it should not be used.
2. The storage temperature is 4-40 ℃, and it cannot be stored outdoors or exposed to the sun. It is suggested that it can be used in various high-rise buildings, all steel buildings, petrochemical, electric power, metallurgy and other indoor and outdoor steel structure fire protection projects.