The correct choice of fireproof coating for steel structure

The main problem in the selection of steel structure fire protection coatings is that the one-sided pursuit of thinning and thinning of coatings in steel structure fire protection projects, and the one-sided publicity and promotion of ultra-thin coatings are extremely unfavorable to the practicality, reliability and safety of buildings. As the ultra-thin steel structure fireproof coating mainly depends on the physical and chemical reaction of the organic ingredients in the formulation, any factor that affects the carbonization and expansion performance of the coating will affect its subsequent fireproof performance. Provide more than 2.0 hours of fire protection for components.

The correct choice of fireproof coating for steel structure

1. Expanded fireproof coating is not suitable for outdoor use

Intumescent fire retardant coatings were initially applied to wooden structures. Due to poor outdoor tolerance, easy aging, peeling, reliability problems of expansion in humid and corrosive environment, high-temperature flame barbecue foaming process, etc., the resin decomposes and produces dense smoke and toxic gases. Therefore, in the absence of special measures, it is not appropriate to use intumescent fire retardant coatings in tunnels, outdoors and buildings where people often live. Nuclear energy, electric power, petrochemical and other projects should be based on thick fire-resistant coatings.

2. Thin coating steel structure fireproof coating

Seriously consider the use of thin-layer steel structure fire-retardant coatings, strictly control the selection of ultra-thin-layer steel structure fire-retardant coatings, and strictly control all-steel structure buildings, especially large buildings and civil building components. Steel columns, steel beams, and steel floors should be preferred , Steel evacuation stairs, etc. It is really difficult to use fireproof materials such as steel mesh concrete. You can choose thick steel structure fire-retardant coatings, carefully choose thin steel structure fire-retardant coatings, and strictly control the choice of ultra-thin steel structure fire-retardant coatings. For high-rise building steel structure and multi-layer steel structure factory buildings, it is not suitable to use thin-coated and ultra-thin steel structure fire-retardant coatings.

3. Choose fire retardant coatings according to the requirements of building components and fire resistance

The concealed steel structure in the building does not have high requirements for the appearance of the paint, so try to use thick steel structure fireproof paint. For bare steel grating, steel roof truss, roof load-bearing structure, when the specification requires that the fire resistance does not exceed 1.5h, thin coating or ultra-thin steel structure fireproof coating can be selected. When the fire resistance exceeds 2.0h, thicker paint should be used. Guangxi Steel Structure Engineering