The Research On The Waterbased Halogen-free Super-thin Fire Retardant Coating For Steel Structure

Steel with high strength, light weight, good scalability advantages, such as the construction industry at home and abroad has been widely applied. Although the steel does not have flammability, but the thermal conductivity, poor fire resistance, without fire protection refractory limit only 0.25 hours, well short of our architectural design requirements of fire safety regulations. Therefore, to improve the fire resistance of steel, we must implement effective fire protection.Steel fire protection measures in a variety of forms, direct spraying fire retardant coating is a kind of ideal, reliable, economical and practical methods. Ultra-thin coating steel structure fire of the 20th century, the 1990s rise of a new type of fire-resistant coating. Meanwhile excellent cosmetic and fire performance. The most of super-thin fire retardant coating is solvent-based in the current market, with the paint industry to the energy-saving, low pollution, high-performance, professional development and fire-proof coating also to the "5-E" direction. This super-thin pair of waterbased fire retardant coating of the steel Structure for study.Super-thin fire retardant coating of the steel structure usually include the base material, flame retardants, fillers and additives, and other components.This paper compares the different resin carbonized layer formed by the quality acrylic resin was chosen for the base fire retardant coating materials, determine the best overall performance when fill suit amount.In this paper, uniform design was used to the amount of fire retardant pilot test design, for different fire-retardant coating thickness and the time relationship was fitted; Discussed the different amount of fire retardant expansion carbon foam layer thickness and magnification; Different pairs of fire retardant coating thickness with the amount of fire retardant to build three model and by optimizing the thickness of coating is different under the optimum amount of fire retardant. resultant of the coating is, Acrylic Resin 28.3% - 31.5%, 13.2% ammonium polyphosphate ~ 14.6%. Pentaerythritol 4.8% ~ 13.2%, melamine 3.2% ~ 3.6%. expandable graphite 3.2% ~ 3.6%, alumina 9.7% ~ 10.8%, 24.2% water ~ 27%, Additives 3.7% ~ 4.2%Finally, with the existing fire Waterborne Coatings for comparative testing, flame retardant, high viscosity and higher bond strength. relatively short drying time, the production of construction convenient, no fire danger, Construction relatively short time, save production costs, paints a wide range of uses, in practical engineering applications to facilitate more economical.