2.5 hours indoor Gypsum Base steel structure Fire retardant coating Manufacturer's commitment
2.5 hour indoor gypsum based steel structure fire protection coating Executive standard GB14907-2018, indoor gypsum based steel structure fireproof coating Composed of special expanded vermiculite, gypsum, inorganic cementation materials, fire retardant additives, high temperature resistant reinforcement materials auxiliary And so on. The coating has good fire and heat insulation properties, and its fire resistance and physical, chemical and mechanical properties reach GB14907-2018.
Construction method:
1、 Check the surface to be coated: before construction, the surface of the steel member needs to be derusted and painted according to the standard anticorrosive paint 。 The coating surface shall be clean and free of oil stain, dust and dew to ensure that the substrate surface is clean and dry.
2、 Construction equipment: air compressor ( The air pressure is four Atmospheric pressure ) , spray gun ( The muzzle diameter is 6-8mm) And low-speed mixer and hand coating tools.
3、 Bag opening: check whether the name and model of the coating are consistent with the design specifications. Check whether the product has exceeded the storage period. If it has exceeded the storage period, it can still be used after passing the inspection. In case of caking, all caking shall be taken out and shall not be mixed into the paint for use, so as not to affect the product quality.
4、 Construction environment: the ambient temperature at the construction site shall be 5-38℃, Wind force exceeds five Spraying is not suitable.
5、 Fire resistance and coating thickness: determine the coating thickness according to the fire resistance requirements proposed by the design institute and the fire department.
6、 Sticking nails and hanging nets: when the coating thickness is required ten When it is more than mm, galvanized wire mesh shall be reinforced on the surface of the base material, and the wire mesh shall be fixed with insulation nails; Coating thickness ten The section of components below mm is less than 20cm This step can be ignored.
In order to better combine the insulation nail with the base material, it is recommended to use the interface agent and cement 1:1 The binder is prepared in the proportion of to be used to bond the insulation nails. The bonding distance of insulation nail is 200~300mm Is appropriate.
7、 Bottom interface processing : In order to better combine the fireproof coating with the primer for steel structure anti-corrosion, interface treatment must be done. The interface coating shall be based on the interface agent: powder: water ＝ four ： ten ： ten The weight proportion of the preparation. The low-speed mixer shall be used for mixing, and the water and interface agent shall be mixed first, and the mixing time is two ～ three Minutes or so; Add thick coating and mix five ～ ten After minutes, the coating will expand and disperse, and continue to add water and stir until the viscosity suitable for spraying is reached. The primer is sprayed with a portable spray gun, and the spraying thickness is one ～ 1.5mm 。 The mixture mixed at one time should be three It shall be used up within hours, and the stacking construction can be carried out after the interface layer is dry.
Main performance indicators（ GB14907-2018）
drying time (surface dry)/h: ≤ 24
Bond strength /MPa：≥0.04
compressive strength /MPa：≥0.3
Water resistance /H: 24h The coating shall be free of delamination, foaming and falling off, and the heat insulation efficiency attenuation shall be ≤ 35%
Cold and hot cycle resistance: After 15 tests, the coating shall be free of cracking, peeling and blistering, and the heat insulation efficiency degradation shall be ≤ 35%
Fire resistance 1.5h 2.0h 2.5h 3.0h 4.0h
