Energy Efficient, Temporary Shear Thinning Siloxane Lubricants and Method of Using

摘要

A method of using energy-efficient lubricant compositions to reduce wear between two surfaces exposed to a high shear condition is provided. The lubricant compositions comprise polysiloxane base oils having alkyl, aryl, or a combination of alkyl and aryl functionality. The polysiloxane base oils may be defined according to the formula:;;wherein R, and R′ are independently selected, such that R is an alkyl group having between 1-3 carbon atoms; R′ is an alkyl or aryl group having between 6 to 20 carbon atoms; and m and n are integers, such that 25<(m+n)<500 and the ratio of m/(m+n) is greater than 0.05 and less than 1.00.

主权项

1. The use of at least one polysiloxane base oil, free of non-silicone base oil, as an energy-efficient lubricant to reduce the film friction that occurs between two mechanical surfaces when the surfaces are moved relative to one another by utilizing temporary shear thinning at a high shear condition defined by a shear rate that is between 1,000 sec−1 and 100,000,000 sec−1; the polysiloxane base oil corresponding to the structural formulaand exhibiting a coefficient of friction that is less than 0.07 at a temperature of at least 303 K with a EHL film thickness of 10 nm or more;
wherein R and R′ are independently selected, such that R is an alkyl group having between 1-3 carbon atoms; R′ is an alkyl or aryl group having between 6-20 carbon atoms; m is an integer, and n is an integer or 0 with 25<(m+n)<500 and 0.05