Effect of Oxygen and Oxidation Initiators (Hydroperoxide) on Antiwear and Antifriction Properties of Polysiloxanes

摘要

The effect of oxidizability of gaseous phase oxidation initiators (hydroperoxide of isopropylbenzene) and easily oxidizing hydrocarbon (4,4'-diisopropyldiphenylmethane) on the lubricity of polysiloxanes of various nature under heavy boundary friction conditions was investigated. Oxidizers produce a weak effect on the lubricity of polysiloxanes in comparison with what has been observed for petroleum oils, but the trend and direction of this effect in all instances is identical-oxidizers and easily oxidizing hydrocarbons delay the development of steel sticking, make it degenerated and promote its breaking away. The effect of oxidizers and easily oxidizing hydrocarbons on lubricity of polysiloxanes increases with a reduction in thermooxidizing stability of the latter. Antifriction properties of polysiloxanes are more sensitive in comparison with antiwear properties with respect to the gaseous phase and composition of lubricants. (Author)