Siloxane Traction Fluids with Ring-Shaped Branch Structures and Method of Using
Traction fluids and a method of using such tractions fluids to increase the interface friction between two surfaces moved relative to one another is provided. The traction fluid may comprise a polysiloxane base oil corresponding to the structural formula: wherein R and R′ are independently selected, such that R is an alkyl group having between 1-3 carbon atoms; R′ is a cycloalkyl dicycloalkyl, or aryl group having between 5-20 carbon atoms; m is an integer; and n is an integer or 0 with 5<(m+n)<100 and 0.50<m/(m+n)<1.00.
1 . A traction fluid capable of increasing the interface friction between two mechanical surfaces when the surfaces are moved relative to one another, the traction fluid comprising:
a polysiloxane base oil corresponding to the structural formula:
wherein R and R′ are independently selected, such that R is an alkyl group having between 1-3 carbon atoms; R′ is a cycloalkyl or dicycloalkyl group having between 5-20 carbon atoms; m is an integer; and n is an integer or 0 with
5<( m+n )<100 and 0.50< m /( m+n )<1.00.
2 . The traction fluid according to claim 1 , wherein R is a methyl group and R′ is a cyclohexyl or cyclopentyl group.
3 . The traction fluid according to claim 1 , wherein the traction fluid further comprises at least one functional additive selected as one from the group of extreme pressure additives, anti-wear additives, antioxidants, and corrosion inhibitors.
4 . The traction fluid according to claim 1 , wherein the traction fluid further comprises one or more compatible base oils having a degree of polymerization between 15 and 500; the compatible base oil selected as polydimethylsiloxane or poly(phenylmethyl dimethyl)siloxane with between 5 and 30 wt. % phenylmethyl D unit content.
5 . The use of at least one polysiloxane base oil as a low wear, traction fluid capable of increasing the interface friction between two mechanical surfaces when the surfaces are moved relative to one another, the polysiloxane base oil corresponding to the structural formula:
wherein R and R′ are independently selected, such that R is an alkyl group having between 1-3 carbon atoms; R′ is a cycloalkyl or aryl group having between 5-20 carbon atoms; m is an integer; and n is an integer or 0 with 5<(m+n)<100 and 0.50<m/(m+n)<1.00.
6 . The use of the low wear, traction fluid according to claim 5 , wherein R is a methyl group and R′ is an aryl or a cycloalkyl group with 7<(m+n)<100.
7 . The use of the low wear, traction fluid according to claim 5 , wherein R is a methyl group and R′ is a diaryl or a dicycloalkyl group.
8 . The use of the low wear, traction fluid according to claim 5 , wherein R is a methyl group and R′ is a cyclohexyl or cyclopentyl group.
9 . The use of the low wear, traction fluid according to claim 5 , wherein the polysiloxane base oil corresponds to structural formula:
10 . The use of the low wear, traction fluid according to claim 5 , wherein the polysiloxane base oil further comprises at least one functional additive selected as one from the group of extreme pressure additives, anti-wear additives, antioxidants, and corrosion inhibitors.
11 . The use of the low wear, traction fluid according to claim 5 , wherein the polysiloxane base oil further comprises one or more compatible base oils having a degree of polymerization between 15 and 500; the compatible base oil selected as polydimethylsiloxane or poly(phenylmethyl dimethyl)siloxane with between 5 and 30 wt. % phenylmethyl D unit content.
12 . The use of the low wear, traction fluid according to claim 5 , wherein the two mechanical surfaces that move relative to one another are part of a traction drive.
13 . The use of the low wear, traction fluid according to claim 5 , wherein the traction fluid is a grease, a gear oil, or a transmission fluid.
14 . A method of increasing the interface friction between two mechanical surfaces when the surfaces are moved relative to one another, the method comprising the steps of:
providing a machine element having a first surface and a second surface; the first and second surfaces being in contact with one another in the machine element;
providing a traction fluid between the first surface and second surface, the traction fluid comprising:
at least one polysiloxane base oil corresponding to the structural formula:
wherein R and R′ are independently selected, such that R is an alkyl group having between 1-3 carbon atoms; R′ is a cycloalkyl or aryl group having between 5-20 carbon atoms; m is an integer; and n is an integer or 0 with 5<(m+n)<100 and 0.50<m/(m+n)<1.00; and
allowing the first surface to roll or slide past the second surface such that the traction fluid increases the interface friction between the first and second surfaces.
15 . The method according to claim 14 , wherein R is a methyl group and R′ is an aryl or a cycloalkyl group with 7<(m+n)<100.
16 . The method according to claim 14 , wherein R is a methyl group and R′ is a diaryl or a dicycloalkyl group.
17 . The method according to claim 14 , wherein R is a methyl group and R′ is a cyclohexyl or cyclopentyl group.
18 . The method according to claim 14 , wherein the polysiloxane base oil corresponds to the structural formula:
19 . The method according to claim 14 , wherein the traction fluid further comprises at least one functional additive selected as one from the group of extreme pressure additives, anti-wear additives, antioxidants, and corrosion inhibitors.
20 . The method according to claim 14 , wherein the traction fluid further comprises one or more compatible base oils having a degree of polymerization between 15 and 500; the compatible base oil selected as polydimethylsiloxane or poly(phenylmethyl dimethyl)siloxane with between 5 and 30 wt. % phenylmethyl D unit content.
21 . The method according to claim 14 , wherein the two mechanical surfaces that move relative to one another are part of a traction drive.