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Lithium base grease and preparation method thereof

A lithium-based grease, lithium soap technology, applied in the field of grease, can solve the problems of difficult mixing with other greases, poor equipment lubrication, low temperature flow performance, etc. Colloidal stability properties, the effect of good colloidal stability

Active Publication Date: 2015-07-08
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the actual application process, lithium-based grease has the disadvantage of poor colloidal stability, and it is not easy to mix with other greases, and it is easy to separate oil during storage and use, which not only leads to shortened service life of equipment due to poor lubrication, It also leads to the deterioration of the environment in which the equipment is used. Therefore, the existing lithium-based grease can no longer meet the increasingly stringent requirements of modern industry.
[0004] At present, the problem of large oil separation in lithium-based lubricating grease is generally solved by adopting the method of improving the raw material formula. The prior art discloses the method of using a certain proportion of lithium-mixed soap instead of single-lithium soap, and switching to a more viscous one. Methods for preparing lithium-based lubricating grease from base oil. Although these methods can slightly improve the colloidal stability of lithium-based lubricating grease, they often cause a significant decline in its low-temperature fluidity and affect its use effect

Method used

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  • Lithium base grease and preparation method thereof
  • Lithium base grease and preparation method thereof
  • Lithium base grease and preparation method thereof

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preparation example Construction

[0054] The present invention also provides a preparation method of lithium-based grease, comprising:

[0055]A) mixing fatty acid or hydroxy fatty acid with layered bishydroxy complex metal oxide and the first mass part of base oil to obtain a mixture;

[0056] B) Add LiOH aqueous solution to the obtained mixture, react and remove water, and refine at high temperature to obtain a lithium-based grease intermediate;

[0057] C) adding a second mass part of base oil, an antioxidant and a corrosion inhibitor to the obtained lithium-based grease intermediate, and grinding to obtain lithium-based grease;

[0058] First, the fatty acid or hydroxy fatty acid is fully mixed with the layered double hydroxy composite metal oxide and the first mass part of base oil to obtain a mixture; the fatty acid is selected from any one or several of C2~C30 fatty acids, and more It is preferably stearic acid; the hydroxy fatty acid is selected from any one or several of C2-C30 hydroxy fatty acids, m...

Embodiment 1

[0080] 5.13g Mg(NO 3 ) 2 ·6H 2 O and 3.75g Al(NO 3 ) 3 ·9H 2 O was mixed with 60mL deionized water in the first constant pressure dropping funnel, and 1.92g NaOH and 2.12g NaOH were mixed at the same time 2 CO 3 Mix with 15mL deionized water in the second constant pressure dropping funnel, install the two constant pressure dropping funnels in a 100mL three-necked flask, and control the dropping speed of the first constant pressure dropping funnel and the second constant pressure dropping funnel The ratio is 4:1, the dropwise addition is completed in 1 hour, and at the same time, the stirring device is turned on, and the reflux crystallization is performed at 100°C for 3 hours. After the reaction is completed, the reaction system is naturally cooled to room temperature (25°C), and the crude magnesium-aluminum binary hydrotalcite is obtained by filtration; then Wash the obtained solid with deionized water, collect the solid by centrifugation, repeat 3 times, and finally dr...

Embodiment 2

[0082] 2.57g Mg(NO 3 ) 2 ·6H 2 O, 2.97g Zn(NO 3 ) 2 ·6H 2 O and 3.75g Al(NO 3 ) 3 ·9H 2 O was mixed with 60mL deionized water in the first constant pressure dropping funnel, and 1.92g NaOH and 2.12gNa 2 CO 3 Mix with 15mL deionized water in the second constant pressure dropping funnel, install the two constant pressure dropping funnels in a 100mL three-necked flask, and control the dropping speed of the first constant pressure dropping funnel and the second constant pressure dropping funnel The ratio is 4:1, the dropwise addition is completed in 1 hour, and the stirring device is turned on at the same time, and the crystallization is carried out at 100°C for 3 hours. After the reaction is completed, the reaction system is naturally cooled to room temperature (25°C), and the crude zinc-magnesium-aluminum ternary hydrotalcite is obtained by filtration; Then the obtained solid was washed with deionized water, centrifuged to collect the solid, and repeated three times, an...

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Abstract

The invention provides lithium base grease. The lithium base grease comprises the following components in parts by mass: 75-95 parts of base oil, 5-20 parts of lithium soap, 2-15 parts of laminated dihydroxy composite metal oxide, 0.1-2.0 parts of antioxidant, and 0.1-2.0 parts of corrosion inhibitor. The laminated dihydroxy composite metal oxide is introduced in the lithium base grease, and organic modified treatment is performed on the lithium base grease by adopting the lithium soap, so that the lithium soap, the laminated dihydroxy composite metal oxide and the base oil achieve highly scattered states; and therefore, the colloid stability of the lithium base grease is obviously improved under the precondition that the low-temperature flow property of the grease is not influenced, and the application of the lithium base grease under a low-temperature environment is expanded.

Description

technical field [0001] The invention relates to the technical field of lubricating grease, in particular to a lithium-based lubricating grease and a preparation method thereof. Background technique [0002] Lithium-based grease is a lubricating material made of fatty acid lithium soap, thickened medium-viscosity mineral lubricating oil or synthetic lubricating oil. In order to improve its performance, additives such as antioxidants can also be added. The dropping point of lithium-based grease is generally around 200°C. It is suitable for the lubrication of rolling bearings, sliding bearings and other friction parts of various mechanical equipment with an operating temperature of -20°C to 120°C. It has good water resistance and mechanical stability. , rust resistance and oxidation stability, etc., are multi-purpose long-life grease. [0003] However, in the actual application process, lithium-based grease has the disadvantage of poor colloidal stability, and it is not easy t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M125/10C10M169/00C10N50/10
Inventor 龙胜前卢现菊曹毅
Owner CHINA PETROLEUM & CHEM CORP
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