An intumescent coating for steel structures

Abstract

The invention discloses an intumescent coating for steel structures. The intumescent coating in the invention includes epoxy resin, borosilicate resin, carbonizing agent, foaming agent, curing agent, dehydration catalyst, organically modified flame retardant, Modified silicon carbide whiskers. Among them, the organic modified flame retardant is phosphorus nitrogen compound modified LDHs. In the present invention, during the heating process, the crystallization water in the LDHs in the organically modified flame retardant in the coating and the hydroxyl group on the laminate will absorb a large amount of heat during thermal decomposition (below 200 ° C), and simultaneously release The large amount of water vapor, therefore, lowers the temperature of the intumescent coating and simultaneously lowers the concentration of flammable gases and oxidizers. As the combustion proceeds, part of the organic modified flame retardant moves to the outside of the foamed carbon layer with the formation of the foamed carbon layer of the foaming agent. The organic modified flame retardant is formed at high temperature by magnesium oxide and aluminum oxide The composed metal oxide layer can insulate heat transfer to the carbon foam layer, thereby realizing the protection of the internal steel structure.

Description

technical field [0001] The invention relates to the field of coatings, in particular to an expansion coating for steel structures. Background technique [0002] With the continuous improvement and development of construction technology, various types of buildings have emerged as the times require. As the dominant structural material in buildings, steel is widely used in high-rise, long-span and complex structures due to its high strength, good ductility, light weight, good plasticity and toughness, especially in the Skyscrapers stadiums, opera houses, etc. around the world. However, with the gradual deepening of people's research on steel, the disadvantages of steel structures under fire conditions are becoming more and more obvious. At high temperatures, the yield strength, tensile strength, and elastic modulus of the steel structure decrease, and the strength and stiffness deteriorate rapidly. Especially at 450°C to 650°C, the steel column will bend, resulting in large d...

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Problems solved by technology

[0004] However, in the actual process, as the combustion temperature increases, the coke layer formed will lose its cohesion at high temperature, which will cause the coke layer to crack and lose the protection of the steel structure.

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