Lubricating grease composition
OwnerRachel Kling, Alexander Grechin +2inventors
InventorsRachel Kling, Alexander Grechin, Bernard Fisic, Karl-Heinz Hensel
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Abstract
The present invention relates to lubricating grease compositions comprising (a) at least one high-viscosity fluorinated oil having a viscosity of 500 to 1500 mm2/s, (b) boron nitride and (c) a binder selected from bentonite, alkali metal phosphates, aluminum phosphates, alkali metal silicates, alkaline earth metal silicates, aluminum silicates, alkaline earth metal carbonates, calcium borate, silicon dioxide, titanium dioxide, aluminum oxide and mixtures thereof. The lubricating grease compositions find use especially in the high-temperature sector, for example for the lubrication of oven pullout rails.
Claims20
A lubricating grease composition comprising
- (a) at least one fluorinated oil having a viscosity of 500 to 1500 mm2/s at 40° C.;
- (b) boron nitride and
- (c) at least one binder selected from bentonite, alkali metal phosphates, aluminum phosphates, alkali metal silicates, alkaline earth metal silicates, aluminum silicates, alkaline earth metal carbonates, calcium borate, silicon dioxide, titanium dioxide, aluminum oxide and mixtures thereof.
The lubricating grease composition as claimed in any of the preceding claims, wherein the fluorinated oil is selected from perfluorinated polyalkyl ether oils, perfluorinated silicone oils and mixtures thereof, and is especially selected from perfluorinated polyalkyl ether oils and mixtures thereof.
The lubricating grease composition as claimed in any of the preceding claims, wherein the binder is selected from bentonite, fumed silica (SiO2), talc (magnesium silicate hydrate), calcium carbonate, calcium borate, pyrogenic titanium dioxide, aluminum oxide and mixtures thereof.
The lubricating grease composition as claimed in any of the preceding claims, wherein the binder is organically modified bentonite or a mixture of organically modified bentonite with at least one further binder selected from alkali metal phosphates, aluminum phosphates, alkali metal silicates, alkaline earth metal silicates, aluminum silicates, alkaline earth metal carbonates, silicon dioxide, titanium dioxide, aluminum oxide and mixtures thereof.
The lubricating grease composition as claimed in any of the preceding claims, wherein the boron nitride is hexagonal boron nitride, especially hexagonal α-boron nitride.
The lubricating grease composition as claimed in any of the preceding claims, comprising essentially no PTFE.
The lubricating grease composition as claimed in any of the preceding claims, comprising essentially no ionic liquid.
The lubricating grease composition as claimed in any of the preceding claims, comprising essentially no graphite.
The lubricating grease composition as claimed in any of the preceding claims, additionally comprising at least one nonfluorinated oil.
The lubricating grease composition as claimed in any of the preceding claims, additionally comprising 0.01% to 1% by weight of water, based on the total weight of the composition.
The lubricating grease composition as claimed in any of the preceding claims, additionally comprising at least one additive.
Dependencies are inferred from the claim text.