Lubricating grease of polyurea/high base number calcium sulfonate composite
AssigneeLANXESS Corporation
InventorLianhui Zhang
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Abstract
The invention discloses a lubricating grease with thixotropy and a preparation method thereof. The lubricating grease comprises a polyurea/high base number calcium sulfonate composite thickener, colloidally dispersed calcium carbonate solid particles in the form of calcite, a calcium borate or calcium borate composite, and a calcium soap of fatty acid having 12 to 24 carbon atoms. The above components are uniformly dispersed in an oil phase medium. The content of high base number calcium sulfonate in the lubricating grease is less than 22 wt %.
Claims13
A high performance, thixotropic polyurea/overbased calcium sulfonate complex hybrid grease comprising:
- 70 to 85 wt % oleaginous medium in which there is homogeneously dispersed:
- at least 8 but less than 20 wt % overbased calcium sulfonate complex thickener comprising fine particles of calcium carbonate in calcite form;
- 0.5 to 6.5 wt % polyurea thickener;
- 0.05 to 3 wt % calcium borate or calcium borate complex;
- 0.5 to 3.5 wt % calcium soap of C12-24 aliphatic fatty acids;
- and
- 0 to 3 wt % lime or calcium hydroxide,
- wherein all percentages are weight % based on the total weight of the grease.
Dependencies are inferred from the claim text.