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Low-temperature lubricating grease composition and preparation method thereof

A technology of low-temperature lubrication and composition, which is applied in the field of lubricating grease, can solve the problems of increased wear, increased movement resistance between friction parts in lubrication parts, poor flow performance, etc., and achieves energy saving, stable product quality, and reduced production costs. Effect

Inactive Publication Date: 2015-02-25
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the viscosity of lubricating grease increases with the decrease of temperature, which leads to its worse fluidity. The friction surface lubricated by mining machinery forms semi-dry friction or even dry friction, which increases the movement resistance between the friction parts of the lubricated part and makes it wear exacerbated

Method used

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  • Low-temperature lubricating grease composition and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Base oil (PAO): 84%;

[0032] Stearic acid: 3.73%

[0033] Lithium hydroxide monohydrate: 0.27%

[0034] Bentonite: 4.0%

[0035] Extreme pressure agent: 2.0%;

[0036] Rust inhibitor: 2.0%;

[0037] Antiwear agent: 2.0%;

[0038] Antioxidant: 2.0%

[0039] Add 3.73% stearic acid to 42% base oil (PAO and trimellitate at a ratio of 1:1, the base oils used below are prepared according to this ratio), mix and heat to 85°C, after the stearic acid dissolves, Add 0.27% lithium hydroxide monohydrate lye (water is 5 times that of lithium hydroxide monohydrate), control the temperature at 90°C, and saponify for 0.5 hours; after the reaction, raise the temperature and drain water, raise the temperature to 130°C, and add 21% base oil Continue to heat up to the highest temperature of 200°C, then add the remaining base oil, stir for five minutes, take it out and cool it down to about 130°C, add 4.0% organic bentonite, and stir quickly at constant temperature for 1 hour. After...

Embodiment 2

[0041] Base oil (150DN): 80%;

[0042] Stearic acid: 6.72%

[0043] Lithium hydroxide monohydrate: 0.78%

[0044] Bentonite: 2.5%

[0045] Extreme pressure agent: 2.0%;

[0046] Rust inhibitor: 4.0%;

[0047] Antiwear agent: 2.0%;

[0048] Antioxidant: 2.0%

[0049]Add 6.72% stearic acid to 40% base oil (150DN), mix and heat to 95°C, after the stearic acid dissolves, add 0.78% lithium hydroxide monohydrate lye (water is 5 times that of lithium hydroxide monohydrate ), the temperature was controlled at 92°C, and the saponification reaction was carried out for 1 hour; after the reaction was completed, the temperature was raised to drain water, the temperature was raised to 130°C, and 20% heating oil was added; the temperature was continued to rise to the highest temperature of 210°C, and then the remaining base oil was added, stirred for five minutes, and the temperature was taken out to cool down To 130°C, add 2.5% organic bentonite, and stir rapidly at constant temperatu...

Embodiment 3

[0051] Base oil (trimellitate): 76%;

[0052] Stearic acid: 7.87%

[0053] Bentonite: 3.0%

[0054] Lithium hydroxide monohydrate: 1.13%

[0055] Extreme pressure agent: 3.0%;

[0056] Rust inhibitor: 4.0%;

[0057] Antiwear agent: 3.0%;

[0058] Antioxidant: 2.0%

[0059] Add 7.87% stearic acid to 38% base oil (trimellitate), mix and heat to 92°C, after the stearic acid dissolves, add 1.13% monohydrate lithium hydroxide lye (water is monohydrate hydroxide Lithium 5 times), the temperature is controlled at 93 ° C, saponification reaction for 1 hour; after the reaction is completed, the temperature is raised to drain, the temperature is raised to 130 ° C, and 19% heating oil is added; the temperature is continued to the highest temperature of 200 ° C, and then the remaining base oil is added and stirred for five minutes, take it out and cool down to 120°C, add 3.0% organic bentonite, and stir rapidly at constant temperature for 1 hour. After constant temperature, add ext...

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Abstract

The invention provides a low-temperature lubricating grease composition and a preparation method thereof. The composition is prepared from base oil, a thickening agent and an additive. The lubricating grease is prepared from a novel thickening agent system and base oil with excellent low-temperature property, so that the lubricating grease has excellent low-temperature fluidity, corrosion and rust resistance and extreme-pressure abrasion resistance; since organic bentonite has a relatively good low-temperature rheological property and does not have phase transformation in the process of forming grease, the denseness of the lubricating grease is not remarkably influenced in temperature changes, the lubricating grease cannot be hardened at a low-temperature environment at -40 DEG C, and the pumping continuity can be ensured. The lubricating grease can be used for breaking through the lubricating management concept of different grease using in winter and summer, which is generally used by large-sized engineering machinery in 'Three-North' regions, so that innovation of universal application of the grease in winter and summer can be realized, and maintenance cost and labor intensity of clients can be reduced.

Description

technical field [0001] The invention belongs to the technical field of lubricating grease, in particular to a composition and a preparation method of low-temperature lubricating grease in the mining machinery industry. Background technique [0002] Since the open-pit coal mines in the northern region are in a cold climate zone, the annual minimum temperature can reach -45°C; large-scale construction machinery such as dump trucks and electric shovels have been operating in the open field for a long time, with harsh working conditions, continuous wind and snow, and low-temperature weather; most construction machinery The friction pair is lubricated by a centralized lubrication system. The longest centralized lubrication pipeline can reach more than 20 meters. The diameter of the centralized lubrication pipeline is small, and many lubrication pipelines and lubrication points are exposed to the air, which puts more stringent requirements on the low temperature performance of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/02C10N50/10C10N30/06C10N30/08C10N30/12
Inventor 申明主张广辽刘志颖高艳青
Owner CHINA PETROLEUM & CHEM CORP
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