INCREASING THE FIRE RESISTANCE OF METAL BUILDING STRUCTURES WITH COATINGS BASED ON FILLED POLYALUMOSILOXANE

Abstract

Metal building structures, which are used in capital construction and reconstruction of existing civil and industrial facilities, are characterized by insufficient fire resistance, this is the main indicator of the durability of structures during a fire. The limit of fire resistance indicates the time during which the structure maintains its integrity and load-bearing capacity. Such parameters as loss of bearing capacity, integrity, flame duration and others are taken into account. A promising way to increase the fire resistance limit of metal structures is to apply flame retardants (FZR) on their surface, which swell under the influence of high fire temperatures to form a heat-insulating layer.

Flame retardants containing mineral binders and additives, as well as organic-based flame retardants (epoxy polymers) have become the most widely used. One of the promising directions for the development of new VZRs is the use of filled polyaluminosiloxanes (PAS) in their formulations. The above determined the relevance of conducting research aimed at revealing the specifics of the impact of the ratios of the components of polyaluminosiloxanes on increasing the fire resistance limit of metal building structures. The development of weather-resistant fire retardants with increased adhesive strength of their coatings and acceptable corrosion-resistant characteristics is an urgent task, the solution of which will contribute to increasing the fire resistance of metal building structures and will have a positive effect on the main indicators of fire statistics.

The starting compositions for protective substances were developed from the conditions of production at high temperatures of the maximum content of temperature-resistant aluminum and zirconium silicates. Introduction to the composition of the coating 1-3 wt. % TiO2 contributes to the synthesis of the above phases and lowers the temperature of their formation by 50-60 degrees. The calculation of the fire resistance limit of a metal column made of I-beam No. 24, protected by a developed fire retardant substance, was performed and it was established that the fire resistance limit of a centrally compressed protected column is 3 times higher than that of an unprotected one.