Intumescent coatings with improved properties for high-rise construction

¹ Peter the Great St. Petersburg Polytechnic University, Higher School of Technospheric Safety, Fire Safety Department, 29 Polytechnicheskaya st., St.Petersburg, 195251, Russia
² Petersburg Nuclear Physics Institute, Neutron Research Department, Condensed state research division, Laboratory of neutron physico-chemical researches, PNPI, 1, Orlova roscha mcr., Gatchina, Leningrad region, 188300, Russia
³ Peter the Great St. Petersburg Polytechnic University, Higher School of Technospheric Safety, 29 Polytechnicheskaya st., St.Petersburg, 195251, Russia

^* Corresponding author: ustinov.andrey1994@gmail.com

Abstract

The paper overviews the way of creating intumescent fire-protective compositions with improved properties by adding nano-and micro-sized supplements into them. Intumescent paints are inert at low temperatures, and at higher temperatures they expand and degrade to provide a charred layer of low conductivity materials. The modified intumescent paints are able to form a more stable charred layer than the classical paints. The stability of a charred layer is crucial if the fire safety in high-rise construction must be secured, because a weak charred layer will not provide a required fire endurance for steel bearing structures and they will break down in case of fire. The fire-protective properties of modified intumescent paints were estimated using an electrical furnace. Also the way of thermal decomposition of the paints was studied with thermogravimetric analysis. Results show that modified intumescent paints form a charred layer with improved fire-protective properties; it can serve as a thermal barrier for a longer period of time. Thermogravimetric analysis confirms this fact showing that the temperatures of full thermal decay in case of modified paints are higher than those of non-modified paints.