Method of preparing greases
AssigneeChevron U.S.A. Inc.
InventorsDAVID S. LEE, RHETT W. JONES
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Abstract
Provided is a method for preparing a grease composition, which comprises mixing an amine in a lubricating bas oil and an isocyanate in a lubricating base oil under high pressure and high flow rate impingement. In one embodiment, the mixing and reaction occurs in a reaction injection molding device. The resulting grease composition is an extremely low noise grease, being virtually clear of any urea thickener particles.
Claims23
A method for preparing a grease, comprising preparing a first mixture comprised of a lubricating base oil and at least one amine, and a second mixture comprised of a lubricating base oil and at least one isocyanate, and mixing the two mixtures together under high pressure and high flow rate impingement conditions to thereby have the at least one amine and at least one isocyanate react and have the reaction product dispersed throughout the lubricating base oil, with the reaction and dispersion occurring nearly simultaneously.
A grease product comprised of a lubricating base oil and at least 20 weight % of a thickener, and the grease having no particles seen at 200× magnification.
A grease product comprised of a lubricating base oil and from about 10-15 wt % thickener, and the grease having no particles seen at 200× magnification.
A grease product comprised of a lubricating base oil and a thickener which shows a change in penetration value from P(60) to P(100,000) of 60 penetration points or less.
Dependencies are inferred from the claim text.