High temperature zinc complex grease

An open kettle process for preparing a zinc complex composition, the process consisting of the steps of:

• a) adding saponifiable materials with a suitable base oil and heating to form a mixture;
• b) adding zinc oxide to the mixture of step (a) and heating gradually to 100-110° C. while controlling frothing and stirring for one hour;
• c) adding complexing acids and remaining amount of zinc oxide to the mixture of step (b);
• raising temperature to 135-140° C. and maintaining at this temperature for one hour with continuous stirring;
• d) heating to elevated temperatures of around 170-175° C. with continuous stirring;
• e) dehydrating a resultant mass of step (d) with the help of vacuum;
• f) addition of remaining base oils as cut back;
• g) cooling and homogenizing/milling to obtain final product:
• and
• h) adding water;
• and
• wherein the complexing agent is selected from dicarboxylic acid, polycarboxylic acid, mono carboxylic acids, boric acid, phthalic acid, and acetic acid.

A closed kettle process for preparing a zinc complex composition, the process consisting the steps of:

• a. adding saponifiable materials, complexing acids and zinc oxide with a suitable base oil to a kettle/reactor in a single step;
• b. closing the kettle/reactor securely;
• c. heating gradually to 110-115° C. and maintaining at this temperature for one hour under continuous stirring;
• d. further raising temperature to 170-175° C. in one hour period and maintaining this temperature under stirring for one hour;
• e. de-pressurizing with caution to avoid any soap leakage followed by dehydrating a resultant mass from step (d) under vacuum with continuous stirring for half an hour;
• f. adding remaining base oils as cut back
• g. cooling and homogenizing/milling to obtain a smooth product;
• and
• h. adding water;
• wherein the complexing agent is selected from dicarboxylic acid, polycarboxylic acid, mono carboxylic acids, boric acid, phthalic acid, and acetic acid.