IONIC LIQUIDS WITH SILOXANE FRAGMENT IN CATION AS HEAT CARRIERS

摘要

FIELD: chemistry.;SUBSTANCE: invention relates to liquid heat carriers. Disclosed are ionic liquids with siloxane fragment in cation of general formula I, where R=Y=CH₃, X=(-Si(CH₃)₂)₂O, n=1 or 3, or X=(-Si(C₂H₅)₂)₂O, n=1; either R=CH₃, Y=H, n=1, X=-Si(CH₃)₂OSi(CH₃)(C₆H₅)OSi(CH₃)₂-; either R=C₆H₅(CH₃)₂SiOSi(CH₃)₂-, Y=H, X=CH₂, n=1, as heat carriers. Novel dicationic ionic liquids with one or two siloxane fragments in a cation of general formula I have significantly lower evaporation capacity (volatility) (less than 0.07 mg/h with area of 1 cm² in conditions of dynamic vacuum) and low pressure of saturated vapour (10^-4 mm Hg) in region of high temperatures (230 °C) in comparison to other existing heat carriers (including ionic liquids studied at present moment), which ensures their explosion safety and considerably lower volatility in dynamic vacuum and open space, as well as physical and chemical and thermophysical properties (viscosity, density, volatility, heat capacity and heat conductivity), enabling their use as heat carriers, as well as components of lubricating and sealing fluids.;EFFECT: low evaporating capacity and low pressure of saturated vapour.;1 cl, 2 tbl, 5 ex;