Lubricant composition
AssigneeNok Klueber Co., Ltd.
InventorsTetsuhiro Miyamoto, Akihiko Shimura, Toshio Nitta, Jiro Yurimoto
Life of this patent
Estimating the term…
Abstract
A lubricant composition which is suitable as a fluorine oil, fluorine grease, and which is excellent in stabilizability, as well as a lubricant composition which is suitable as a fluorine oil, fluorine grease, and which has excellent rust prevention properties while keeping a heat resistance.
Claims14
A method for improving heat resistance of a lubricating oil including at least a perfluoropolyether oil represented by the following General Formula (A), comprising the steps of:
- preventing decomposition of the perfluoropolyether oil at high temperatures by adding a fluorine-containing diamide compound represented by the following Formula (I) in the range of 0.5 to 5 wt % based on the lubricating oil, dissolving it in the perfluoropolyether oil and making a solution:
- RfO(CF2CF2O)j(CF2O)kRf General Formula (A);
- wherein,
- Rf represents a perfluoro lower alkyl group having 1 to 5 carbon atoms,
- j+k=3 to 200, and j:k=10:90 to 90:10, and each repeating unit is randomly bonded;
- wherein,
- Y represents an oxygen atom (O), sulfur atom (S), CO group, SO group, or SO2 group;
- k is an integer of 1 to 5;
- m is an integer of 1 to 2;
- and
- n is an integer of 11 to 40;
- and wherein substituting positions of two substitutional groups possessed by each phenyl group may be any one of an ortho-position, meta-position, and para-position.
A method of reducing the rust generation rate of a first component having a sliding surface that engages with a sliding surface of a second component where the sliding surface of the first component and the sliding surface of the second component move relative to each other comprising:
- providing a rust-preventing property to a lubricant composition including a perfluoropolyether oil by adding a fluorine-containing diamide compound represented by the following Formula (I) in the range of 0.5 to 5 wt % based on the lubricant composition, dissolving it in the perfluoropolyether oil represented by the following general formula (A) or (B) and making a solution and making a lubricant composition and applying the lubricant composition to the sliding surface of the first component and the sliding surface of the second component:
- RfO(CF2CF2O)j(CF2O)kRf General Formula (A);
- wherein,
- Rf represents a perfluoro lower alkyl group having 1 to 5 carbon atoms,
- j+k=3 to 200, and j:k =10:90 to 90:10, and each repeating unit is randomly bonded;
- F[CF2CF2CF2O]mRf General Formula (B);
- wherein,
- Rf represents a perfluoro lower alkyl group having 1 to 5 carbon atoms,
- m=2 to 100;
- wherein,
- Y represents an oxygen atom (O), sulfur atom (S), CO group, SO group, or SO2 group;
- k is an integer of 1 to 5;
- m is an integer of 1 to 2;
- and
- n is an integer of 11 to 40;
- and wherein substituting positions of two substitutional groups possessed by each phenyl group may be any one of an ortho-position, meta-position, and para-position.
Dependencies are inferred from the claim text.