Scientific Journal Problems of Emergency Situations - A. Skripinets, N. Saienko, O. Hryhorenkо, K. Afanasenko, O. Makarenko. Use of fire- and vibration-protective mastics in railway transport. Р. 272-284.

A difficult combustible epoxyurethane mastic with increased vibration-damping properties and the necessary physical and mechanical properties has been developed for lining internal metal surfaces of railway rolling stock. Epoxyurethane network polymers were used as a polymer matrix. To reduce flammability, the fire-retardant additive ammonium polyphosphate was used, and a filler with a hydrophobized surface was used to impart thixotropic properties Aerosil. Dynamic mechanical spectroscopy using a dynamic relaxometer was used as a method for studying viscoelastic properties. The study of viscoelastic properties was carried out in the ultra-low frequency range of 0.7–1.0 Hz, which minimizes the effect of external mechanical influences on changes in the structure of the polymer matrix in the temperature range from –100 to +100 °C. It has been determined that compositions based on oligester cyclo-cab modified with an epoxy diane oligomer are characterized by the best damping capacity (tgδ=0.97). It has been established that the developed mastic composition containing a fire retardant and thixotropic additive has the highest damping capacity (tgδ=0.45–0.47) in the highly elastic region; this composition can be used as a vibration-absorbing material, operable at temperatures from –60 °C up to +60 °C. It has been established that the developed mastic belongs to the group of difficult combustible materials, with slow flame propagation, moderate smoke generating ability and are moderately hazardous in terms of toxicity. The achieved level of characteristics of the difficult combustible vibration damping mastic testifies about the prospects of its further use for facing the internal metal surfaces of bodies of railway rolling stock in order to ensure their fire safety and acoustic comfort.

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