Abstract

The present application relates to polyurea/calcium sulfonate complex grease composition for use in constant velocity joints. 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, a calcium soap of fatty acid having 12 to 24 carbon atoms, an organic molybdenum compound, and an antioxidant. 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%.

IPC Classes  ?

• C10M 169/02 - Mixtures of base-materials and thickeners
• C10M 115/10 - Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing sulfur
• C10M 119/24 - Lubricating compositions characterised by the thickener being a macromolecular compound containing nitrogen
• C10M 117/04 - Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen containing hydroxy groups
• C10M 123/04 - Lubricating compositions characterised by the thickener being a mixture of two or more compounds covered by more than one of the main groups , each of these compounds being essential at least one of them being a macromolecular compound
• C10M 125/26 - Compounds containing silicon or boron, e.g. silica, sand
• C10M 125/10 - Metal oxides, hydroxides, carbonates or bicarbonates

Abstract

The present invention relates to an improved process for producing red iron oxide pigments by the Penniman process with nitrate (also called nitrate process or direct red process) and to apparatus for implementing this process, and also to the use of the plant for producing red iron oxide pigments by the Penniman process with nitrate.

IPC Classes  ?

• C09C 1/24 - Oxides of iron
• C01G 49/06 - Ferric oxide [Fe2O3]