Исследование эксплуатационных характеристик наномодифицированных огнезащитных вспучива-ющихся композиций в условиях углеводородного пожара на объектах транспортировки нефтепродуктов

Abstract

One way to provide the required fire resistance of steel structures for oil and gas facilities is the use of intumescent compositions. With the flare burning of vapors of petroleum products, the deformation and collapse of structures subjected to high temperature (up to 1200 °C) and erosion. As objects of study the carbon nanomaterials containing MWCNT with parameters d = 30 nm, l = 2…5 mm were selected. The basis for the modified material was intumescent paint for steel structures “Thermal barrier”, produced by TU 2313-001-30642285-2011. Modification of a flame retardant was conducted using the Deposit of MWCNT in solvent (o-xylene), with further stirring the filler at a concentration of 0.10…1.25 % by vol. Individual components of the intumescent compositions were subjected to electrophysical influence with the parameters of variable frequency-modulated potential (VFMP) 56 V, 50 Hz. Study of fire resistance performance of nanomodified intumescent compositions was conducted in a laboratory setting, simulating the conditions of hydrocarbon combustion. For almost all samples of modified intumescent compositions containing MWCNT, there is a slower (10…55 %) increase in the temperature of the object of protection within the time of observation, in comparison with non-modified coating intumescent compositions. For samples with intumescent compositions with the primer GF-021 without MWCNT, the rate of temperature increase of metal in general, inversely proportional to the concentration of MWCNT in flame-retardant composition as no electrical influence, and when exposed to VFMP. For samples with intumescent compositions with the primer GF-021 with MWCNT at a concentration of 1.0 % by vol., the growth rate of metal temperature has a clear dependence on the concentration of MWCNT in flame-retardant composition. Depositing in the basic fire retardant composition of MWCNT as a whole leads to a decrease in the coefficient of swelling, which certainly negatively affects the overall effectiveness of modified intumescent compositions. However, for a number of samples of the intumescent compositions without MWCNT in primer the rise of the coefficient of swelling for the concentrations of MWCNT in flame-retardant composition 0.50 to 0.75 % by vol. It is also established that the deposition of MWCNT in the primer GF-021 as a rule, reduces the adhesion strength of the intumescent compositions for 10…20 % at the concentration of MWCNT in flame-retardant composition from 0 to 0.5 %. With a further increase in the concentration of MWCNT in flame-retardant composition to 1.25 % adhesive strength of the intumescent compositions with MWCNT deposited in the primer GF-021, slightly higher in comparison with the intumescent compositions with non-modified primer and the original sample. For samples intumescent compositions obtained with VFMP, there is a significant (40 %) increase in adhesion strength for coatings with unmodified primer GF-021. Upon further study of modified intumescent flame retardant compositions, we plan to conduct a comprehensive thermal analysis of songs to determine the nature of a fire retardant effect of sample coverings from the nature of their modification. Thus, optimization of the formulation and application technology of modified fire-resistant intumescent compositions allows applying them successfully to protect the metal installations on the transportation of petroleum products, characterized by a high risk of hydrocarbon fire.