Regularities of combustion of aerosol-forming fire-suppressing compounds of through passage pressing

摘要

Now all over the world systems of aerosol fire-fighting are used. In this systems as a source of fire-suppressing substance aerosol-forming fire-suppressing compounds (AFC) are used. Particles formed at combustion of AFC break off the chain reactions proceeding in a flame of various organic materials at their combustion on air. Well-known AFC are differed on composition, fire-suppressing ability (FSA), combustion temperature, burning rate and other characteristics. In the majority of cases charges of AFC make by a blind die moulding. In Mendeleyev University besides blind die moulding compounds the compounds which are processed into finished articles with use of rolling and through passage pressing develop. Among such compounds the most perspective are compositions based on plasticized phe-nolformaldehyde resin (PFR). Influence of changing the contents of AFC components with various values of an oxidizer-to-fuel ratio (from 0.8 up to 1.1) on their key properties -burning rate at atmospheric pressure and FSA are investigated. Compounds are stably burning at atmospheric pressure that is important for maintenance of safe operation of fire-suppressing generators. Burning rate varies from 2 up to 6 mm/s, and FSA -from 9 up to 13 g/m~3. All investigated compounds practically do not contain toxic and fire-explosive substances in combustion products. Structurally-mechanical and the processing behaviour of these compositions optimised by addition into their composition of the modificator (PTFE), which allows to process them into finished articles by a through passage pressing method.