Research And Development On Fire Retardant Coating And Hollow Silica Spheres

There are two parts in this paper.At the first part we prepared the ultra-thin fire retardant coating for steel. The use of steel framework as a method of building construction is commonplace. Steel framed buildings offer many advantages over traditional methods of construction but suffer one major disadvantage, namely that in the event of fire in the building the temperature of unprotected steel quickly increases to a point where the steel 'softens', loses its rigidity and compromised the integrity of the structure. It will make the people's lives and fortune in dangerous, so whether the steel has been protected is very important in reality. The first part of this paper focused on research and development of ultra-thin fire retardant coating. In comparison with different resins, we picked out the acrylic resin with good properties, then made sure the raw materials and appropriate ingredients ratio of P-C-N fire retardant system. We compared the fire-proof character of different additives, such as pigment, expandable graphite (EG) and organobentonites. Finally, we concluded the best formulation of composite fire retardant coating which has passed the test holding by the National Fire-proof Test Centre.In the second part we fabricated the hollow silica spheres derived from the miniemulsion technique. Recently, miniemulsion techniques have been found to offer a particularly attractive way of obtaining nanoparticles. If the reactant may be dispersed in the dispersed phase, but is insoluble in the continuous phase, then each miniemulsion droplet may be regarded as a small nanoreactor capable of generating nanoparticles with different morphologies. Moreover, the miniemulsion techniques have many other advantages, such as using the least amount of surfactant, producing the monodisperse particles. The second part of this paper focused on fabrication of hollow silica spheres derived from the miniemulsion technique. The miniemulsion droplets of teraethoxysilane (TEOS) and octane were prepared with cetyltrimethylammonium bromide (CTAB) as a surfactant and the hexadecane as a co-stabilizer and used as templates. As the TEOS diffused out from the droplets, it was hydrolyzed and condensed to form a silica shell at the oil/water interface. We found that the average hollow silica spheres size increased with a decrease in the concentration of CTAB, and the average size of hollow silica spheres decreased a little with the increase in the amount of TEOS. The hollow silica spheres were very stable and the hollow structure did not collapse even after calcination at 800℃for 2h. We discovered that the average pore diameter of hollow silica spheres did not change, but the specific surface area of hollow silica spheres increased after the calcination process. This simple procedure can also be extended for the preparation of other inorganic hollow spheres.