Polyurea lubricating greases containing carbonates, and their use
AssigneeFuchs Petrolub SE
InventorsHans Jürgen ERKEL, Olaf BINKLE, Torsten GOERZ
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Abstract
The invention relates to polyurea lubricating grease compositions containing polyurea thickeners and at least one organic carbonate, to lubrication points or components containing the polyurea lubricating grease composition, to a seal comprising sealing material from fluorinated elastomers and to the use of the lubricating greases.
Claims15
A polyurea grease composition comprising:
- a) at least one base oil;
- b) at least one polyurea thickener;
- and
- c) at least one organic carbonate, wherein the organic carbonate comprises 4 to 8 carbon atoms,
- wherein the composition comprises:
- a) 55 to 95% by weight of the base oil;
- b) 1 to 20% by weight of the polyurea thickener;
- and
- c) 0.1 to 10% by weight of the organic carbonate.
The polyurea grease composition according to at least any one of the preceding claims, characterized in that the composition furthermore comprises:
- g) 0 to 20% by weight, in particular 1 to 15%, of further organic thickeners, in particular soap or complex soap thickeners on the basis of calcium soaps, lithium soaps, or aluminum soaps, in particular lithium soaps.
The polyurea grease composition according to at least any one of the preceding claims, wherein the composition contains no bentonites, no aluminosilicates, no aluminum oxides, no silicic acids, and no amorphous silicon dioxide, and in particular no inorganic thickeners.
The polyurea grease composition according to at least any one of the preceding claims, wherein the organic carbonate is a cyclic carbonate, in particular propylene carbonate.
The polyurea grease composition according to at least any one of the preceding claims, characterized in that the composition comprises a cone penetration value for the worked penetration of 220 to 430 mm/10 at 25° C., preferably 265 to 385 mm/10 at 25° C., determined according to ISO 2137.
The polyurea grease composition according to at least any one of the preceding claims, wherein the base oil comprises a kinematic viscosity of 20 to 2500 mm2/s, preferably of 40 to 500 mm2/s, in each case at 40° C.
A lubrication point comprising the polyurea grease composition according to at least any one of the preceding claims, and a seal comprising a sealing material, wherein the sealing material consists of an elastic fluoropolymer.
Dependencies are inferred from the claim text.