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Among the many fire protection measures for steel structures, applying fire retardant coatings is the most economical and effective method
At present, the water-based intumescent fireproof coatings on the market mainly use acrylic emulsion as film-forming material, and use ammonium polyphosphate (APP, carbon-forming catalyst), pentaerythritol (PER, carbon-forming agent), melamine (MEL, foaming agent) as a barrier In the combustion system, when heated, the film-forming material melts and becomes soft, the carbon-forming agent is dehydrated into carbon under the action of the catalyst, and the carbonized material and the molten film-forming material are formed under the action of the gas generated by the thermal decomposition of the foaming agent.
Studies have shown that titanium dioxide is one of the few pigments that can react with ammonium polyphosphate at high temperature to improve the fire resistance of coatings
(2) Comparing the four inorganic fillers and their mixed fillers with a mass ratio of 1:1, the mixed filler with a mass ratio of kaolin and aluminum hydroxide of 1:1 has a good synergistic flame retardant effect;
(3) When the mixed filler content of 1:1 mass ratio of kaolin and aluminum hydroxide is 5%, the strength of the carbon layer and the state of the carbon layer can be significantly improved, the expansion ratio of the coating is 31 times, and the fire resistance is the best