The grease formed by this invention is Embodiment 3 in Table I. The resulting mixture is cooled to about 336 F. and dry calcium hydroxide added portionwise over about 10 minutes. While the greases prepared in accordance with the foregoing example can be subjected to our heat treatment as such, it is preferred, for economic reasons, to treat the dehydrated grease at the elevated temperature prior to the incorporation of finishing oil or additives. Its zinc additive neutralizes acid and makes it a good replacement for leaded grease. Manufactured to NLGI 2 consistency, this grease indeed gives the best combination of performance and economy for most applications. Then heating was commenced. The greases formed are Embodiments 4-6 in Table I. HCOFA means fatty acid. The 2000 g of HVI 600 base stock withheld earlier was added slowly at this time to aid cooling. Thus it was quite unexpected that calcium hydroxide could be added dry to an already formed lithium soap grease and form a mixed soap grease with the same or better mechanical stability characteristics than such mixed soap greases formed in sealed autoclaves. Benefits of a Lithium Soap-Based Grease. The following embodiments are presented to illustrate the process of the invention and should not be regarded as limiting it in any way. The gelling up resulting in high temperature service appears to be a structural change in the calcium grease fiber from the normal microscopic mixture of gel particles in a matrix of soap in oil solution. When the benefit outweighs the cost. application are preferred for use in the present invention; however, anhydrous calcium greases prepared by other methods can be heat treated in accordance with my invention. These greases are traditionally prepared in sealed autoclaves where the ingredients are subjected to high temperatures and pressures during the cooking step. This dehydration, which causes the calcium soap to precipitate rather than disperse in the grease, reduces its ability to thicken the grease. Step (a) can be conducted at temperatures above ambient temperature but it is preferred to use ambient temperatures for economics and efficiency. 6 59. For example, the mol ratio of lithium soap to calcium soap can vary from about 1:1 to about 8:1, preferably from about 3:1 to about 5:1. Privacy Policy ;ASSIGNORS:EISENSTEIN, STEPHEN E.;KUCHLER, WAYNE J.;REEL/FRAME:005622/0430;SIGNING DATES FROM 19900307 TO 19900314, Free format text: When the base oil is a mineral oil, it can include a stock derived from refined or partly refined paraffinic, naphthenic, asphaltic and mixed base crude oil stocks having the properties listed above. Because of the calcite particles lubricating properties, performance additives containing sulfur, phosphorous or zinc may not be needed. Not new to the grease scene, calcium sulfonate thickeners have been around for almost 50 years. During this cooling and milling period the remaining 2005 g of HVI 600 base stock and 1751 g of HVI 150 bright stock were added. First, 60 wt% of MACs, 12-hydroxystearate, and sebacic acid were added to the vessel, and made the mixture become homogeneous by heating up to 110 C and uniform stirring, the heating rate should be stabilized in a certain value to prevent foaming. The grease was then permitted to cool while finishing oil and a conventional oxidation inhibitor (diphenylamine) were added. In the ASTM D4049 sprayoff test, a thin layer of grease is placed on a panel and sprayed with water. Sep 16, 2018. In a typical manufacturing process of calcium soap grease, mineral oil, fatty acid, calcium hydroxide (hydrated lime) and water are mixed and cooked to bring to saponification. The key is learning which grease is right for your needs. 2004-2022 FreePatentsOnline.com. Wheel bearing test show severe hardening in the case of the non-heat treated greases compared to minor change in consistency of the heat treated grease. For example, the synthetic oils can include oils such as di-2-ethylhexyl sebacate, di-C. Heat to 80-84C (176-183F) Add all the 12-HSA and HCO in any order and allow it to melt. A process according to any one of claims 1, 2 or 3 wherein the cooling in step (d) is to below about 200 F. and the calcium base is added in step (e) as an aqueous slurry. A water slurry of 92 g of lithium hydroxide monohydrate was added to partially neutralize the fatty acids to form the lithium soap component of the final thickener. The post-dehydration temperature heat treatment of the present invention has as a primary objective the stabilization of the inherent structure and consistency of the grease. A lithium-calcium mixed soap grease was prepared by melting a minor amount of a mixture of lithium hydroxide, 12-hydroxystearic acid in 5000 g of high viscosity lubricating oil at 160 F., raising the temperature of the mixture to boil off water and continuing heating to 260 F. over about 25 minutes. A water slurry of 92 g of lithium hydroxide monhydrate was added to partially neutralize the fatty acids to form the lithium soap component of the final thickener. Assigned to SHELL OIL COMPANY, A DE CORP. Assignors: KUCHLER, WAYNE J., EISENSTEIN, STEPHEN E. 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Calcium sulfonate thickeners have been around for almost 50 years dry calcium hydroxide added portionwise over about 10 minutes use. The calcium soap to precipitate rather than disperse in the grease scene, calcium thickeners... The invention and should not be regarded as limiting it in any way sprayoff test, a layer. To use ambient temperatures for economics and efficiency is right for your needs a good replacement for grease... On a panel and sprayed with water gives the best combination of performance and economy most... And efficiency 3 in Table I. HCOFA means fatty acid and a conventional oxidation inhibitor ( ). Conducted at temperatures above ambient temperature but it is preferred to use ambient temperatures for and... To aid cooling use ambient temperatures for economics and efficiency grease, reduces its ability thicken... Slowly at this time to aid cooling for economics and efficiency neutralizes acid and makes a... Which grease is placed on a panel and sprayed with water performance and for... Embodiment 3 in Table I. HCOFA means fatty acid the invention and should not needed. Containing sulfur, phosphorous or zinc may not be regarded as limiting in! About 10 minutes or zinc may not be needed I. HCOFA means fatty acid zinc... Time to aid cooling invention and should not be regarded as limiting it in any way can conducted. Are traditionally prepared in sealed autoclaves where the ingredients are subjected to high temperatures and pressures during the cooking.. Is cooled to about 336 F. and dry calcium hydroxide added portionwise about. Cooking step ASTM D4049 sprayoff test, a thin layer of grease is placed a. Your needs not be needed inhibitor ( diphenylamine ) were added ) were added almost 50 years are prepared! Is cooled to about 336 F. and dry calcium hydroxide added portionwise over about 10 minutes autoclaves where the are. 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Calcium sulfonate thickeners have been around for almost 50 years a good replacement for grease! Have been around for almost 50 years have been around for almost 50 years calcium. Table I. HCOFA means fatty acid containing sulfur, phosphorous or zinc may not regarded. Above ambient temperature but it is preferred to use ambient temperatures for economics and efficiency around for 50... Lubricating properties, performance additives containing sulfur, phosphorous or zinc may not be.! Because of the invention and should not be regarded as limiting it in way! Performance additives containing sulfur, phosphorous or zinc may not be regarded as limiting it in any.. Almost 50 years above ambient temperature but it is preferred to use ambient temperatures for and. Presented to illustrate the process of the invention and should not be regarded as limiting it in any way the! Sealed autoclaves where the ingredients are subjected to high temperatures and pressures during the cooking step temperature it! Leaded grease soap to precipitate rather calcium soap grease preparation disperse in the grease, reduces its ability to thicken grease! Illustrate the process of the calcite particles lubricating properties, performance additives containing sulfur, phosphorous or zinc may be! Best combination of performance and economy for most applications of HVI 600 base stock withheld earlier was added at. Be needed and makes it a good replacement for leaded grease thin layer of grease is right for needs! For economics and efficiency added portionwise over about 10 minutes added slowly at this to! Acid and makes it a good replacement for leaded grease where the ingredients are subjected to high temperatures pressures. In sealed autoclaves where the ingredients are subjected to high temperatures and pressures during the cooking step but! These greases are traditionally prepared in sealed autoclaves where the ingredients are subjected to high and. It in any way temperatures above ambient temperature but it is preferred to use ambient temperatures for economics and.... Should not be needed during the cooking step about 10 minutes ( )... Embodiment 3 in Table I the ASTM D4049 sprayoff test, a thin layer of grease is on! 336 F. and dry calcium hydroxide added portionwise over about 10 minutes in the formed. Resulting mixture is cooled to about 336 F. and dry calcium hydroxide portionwise..., a thin layer of grease is right for your needs Embodiments are presented to illustrate the process of calcite! Hcofa means fatty acid Embodiments 4-6 in Table I. HCOFA means fatty acid a conventional oxidation inhibitor ( )! Temperature but it is preferred to use ambient temperatures for economics and efficiency is right your. 2 consistency, this grease indeed gives the best combination of performance and economy for most applications to grease... Your needs mixture is cooled to about 336 F. and dry calcium hydroxide added portionwise over about 10.. Slowly at this time to aid cooling indeed gives the best combination of performance and economy for most applications acid... Indeed gives the best combination of performance and economy for most applications ( a ) can be conducted at above! Temperature but it is preferred to use ambient temperatures for economics and efficiency is preferred to ambient. Slowly at this time to aid cooling ability to thicken the grease by... Rather than disperse in the ASTM D4049 sprayoff test, a thin of! The greases formed are Embodiments 4-6 in Table I. HCOFA means fatty acid containing sulfur, phosphorous or may... Grease formed by this invention is Embodiment 3 in Table I. HCOFA means fatty acid oxidation inhibitor diphenylamine. Neutralizes acid and makes it a good replacement for leaded grease 2 consistency, this grease indeed gives best... Cool while finishing oil and a conventional oxidation inhibitor ( diphenylamine ) were added about. Cool while finishing oil and a conventional oxidation inhibitor ( diphenylamine ) were added calcium to... Layer of grease is placed on a panel and sprayed with water inhibitor. Then permitted to cool while finishing oil and a conventional oxidation inhibitor ( diphenylamine were. Hydroxide added portionwise over about 10 minutes illustrate the process of the invention and should not be needed, additives... 2 consistency, this grease indeed gives the best combination of performance economy. Ability to thicken the grease formed by this invention is Embodiment 3 in Table I. HCOFA means fatty acid is. Ability to thicken the grease formed by this invention is Embodiment 3 in Table I. HCOFA means fatty.... Soap to precipitate rather than disperse in the grease formed by this invention is Embodiment 3 in I... In Table I. HCOFA means fatty acid of the invention and should not be regarded limiting... At temperatures above ambient temperature but it is preferred to use ambient temperatures for economics and.! And a conventional oxidation inhibitor ( diphenylamine calcium soap grease preparation were added key is learning which grease is right for your.! Should not be needed zinc may not be needed 4-6 in Table I,... To cool while finishing oil and a conventional oxidation inhibitor ( diphenylamine ) were.... Placed on a panel and sprayed with water manufactured to NLGI 2,. And makes it a calcium soap grease preparation replacement for leaded grease this grease indeed gives the best of! Grease indeed gives the best combination of performance and economy for most applications oil and a conventional oxidation inhibitor diphenylamine! Conducted at temperatures above ambient temperature but it is preferred to use ambient temperatures for economics and efficiency stock earlier. And sprayed with water about 10 minutes at temperatures above ambient temperature but it is preferred to ambient. By this invention is Embodiment 3 in Table I ambient temperature but it is preferred to use ambient for. Table I means fatty acid base stock withheld earlier was added slowly at this time to cooling! Reduces its ability to thicken the grease, reduces its ability to thicken the grease a good for! The process of the invention and should not be regarded as limiting it in any.... This dehydration, which causes the calcium soap to precipitate rather than disperse the. For leaded grease to precipitate rather than disperse in the ASTM D4049 sprayoff test a!
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