Lithium-based greases, especially those thickened with […]
Lithium-based greases, especially those thickened with 12-base lithium stearate, have only two intersection temperatures, and the first intersection temperature (ie, from pseudo-gel state to gel state) is generally above 170 ℃. The second phase transition temperature (i.e., from the gel state to the sol state) is generally above 200 ℃. Therefore, when a suitable mineral oil is selected, it can be used at 120 ℃ for a long time or 150 ℃ for a short period of time.
Lithium-based greases, especially those thickened with 12-base lithium stearate, can be seen by electron microscopy. The soap fibers form double-stranded, entangled twisted ribbons, thus having good mechanical stability. . Determination of the heat of adsorption of alkane by 12-yl lithium stearate and lithium stearate by gas chromatography, and the binding strength of lithium 12-carboxylate and lithium stearate to the surface of soap fiber The liquid phase bonding strength in the crystal lattice is large, and therefore, the lithium-based grease has good colloidal stability. The alkali metal has a small degree of enthalpy to water, and therefore, the lithium-based grease has good water resistance and can be used for wet and mechanical parts in contact with water.