Interior fire-resistant coating for expanded steel structural frames

Expanding fire-resistant coating for steel structures refers to a type of coating with a thickness of 3mm or less, offering good decorative effects. It can expand and foam at high temperatures and is a fire-resistant coating with a limit of fire resistance generally not exceeding 2.5 hours. This type of fire-resistant coating for steel structures is typically a solvent-based system, characterized by its superior bonding strength, good weather and water resistance, good leveling properties, and decorative qualities. When exposed to fire, it slowly expands and foams to form a dense and hard fire insulation layer. This fire-resistant layer has strong impact resistance, delays the temperature rise of the steel, and effectively protects the steel components.

Thickened fire-resistant steel structure coatings can be applied by spraying, brushing, or rolling, typically used on building steel structures with fire resistance requirements of 2.5h or less. New types of ultra-thin fire-resistant steel structure coatings, with fire resistance of 2.5h or more, have emerged. They are primarily composed of a base adhesive made from a special structure of poly(methyl methacrylate) or epoxy resin, blended with amino resin, chlorinated paraffin, etc. They are supplemented with fire-retardant systems such as high-polymer ammonium polyphosphate, pentaerythritol, melamine, and added with inorganic fire-resistant materials like titanium dioxide and wollastonite. These are compounded with 200# solvent oil. This type of fire-resistant coating is commonly used for fire protection on various light steel structures and grid frameworks.

Due to the ultra-thin coating of this type of fire-retardant paint, the amount required is significantly less than that for thicker and thinner steel structural fire-retardant paints, thereby reducing the total project cost while providing effective fire protection for the steel structure, with excellent fire-retardant performance.