Calcium carbonate based sulfonate grease compositions and method of manufacture

摘要

An overbased calcium sulfonate grease composition comprising a reduced amount of overbased calcium sulfonate, added calcium carbonate, base oil, one or more converting agents, and one or more complexing acids if a complex grease is desired. The calcium sulfonate grease composition improves thickener yield and expected high temperature utility as demonstrated by dropping point. The calcium carbonate may be used to react with complexing acids when making a complex grease, such that the addition of calcium oxide or calcium hydroxide is not required. A method of making the composition comprising the steps of mixing the overbased calcium sulfonate and base oil, adding the calcium carbonate, adding one or more converting agents, and adding one or more complexing acids. All or a portion of one or more of the complexing acids may be added with or prior to the one or more converting agents.

主权项

1. A calcium sulfonate complex grease composition comprising the following ingredients:
around 10% to 36% overbased oil-soluble calcium sulfonate containing 28% to 36% dispersed calcium carbonate and 0% to 8% residual calcium oxide or calcium hydroxide; 2% to 20% crystalline calcium carbonate added in addition to the amount of dispersed calcium carbonate contained in the overbased oil-soluble calcium sulfonate; wherein the calcium sulfonate complex grease has a worked 60 stroke penetration between 220 and 295 and a dropping point of 575 F or higher; wherein the amount of dispersed calcium carbonate and residual calcium oxide or calcium hydroxide are by weight of the overbased oil-soluble calcium sulfonate and all other amounts are by weight of the final complex grease; and wherein no calcium oxide or calcium hydroxide is added in addition to the amount of residual calcium oxide or calcium hydroxide contained in the overbased oil-soluble calcium sulfonate.