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Process for preparing composite lithium base grease

A technology of base grease and lithium complex

Active Publication Date: 2009-07-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Without the recrystallization process, it is impossible to change the crystallization form of the lithium complex grease thickener by means of cooling, so it is unnecessary to carry out high-temperature refining at 190-230°C
[0006] In addition, the initial oxidation and decomposition temperature of lithium complex grease with mineral oil as the base oil is generally between 180°C and 190°C. Therefore, if the refining temperature is 190°C to 230°C, the base oil will be oxidized and the base oil will be destroyed. Oxygen free radicals are generated prematurely due to the original stability, which leads to the obvious deterioration of the oxidation stability of the grease, and also consumes a lot of energy during the heating process

Method used

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  • Process for preparing composite lithium base grease

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Experimental program
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Effect test

example 1-4 and comparative example 1-2

[0021] Prepare lithium complex grease according to the raw materials and reaction conditions shown in Table 1: add the base oil into the saponification kettle, then add 12-hydroxystearic acid and dibasic acid into the saponification kettle, heat and stir, and gradually make the temperature reach the saponification temperature Slowly add the dissolved lithium hydroxide aqueous solution into the saponification kettle, fully stir for saponification and dehydration; after rising to the highest refining temperature, refine at a constant temperature for a period of time, then add the remaining base oil to quench the lubricating grease in the kettle, and the temperature drops When it reaches about 100°C, after grinding, a high dropping point lithium complex grease is made. The performance of lithium complex grease is shown in Table 2.

[0022] Table 1:

[0023]

[0024] Raw material molecular weight:

[0025] Lauryl hydroxystearic acid, g / mol 300.48

[0026] Adipic acid, g / mol ...

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Abstract

The invention provides a method for preparing complex lithium grease, comprising: part of base oil is mixed with C12-C24 monobasic organic acid and at least one C4-C18 binary organic acid; the mixture is heated up to 80-120 DEG C and then added with lithium hydroxide aqueous solution for saponification reaction, and then moisture is removed; the temperature is risen to 130-180 DEG C for refining at the constant temperature, the rest base oil is added into the mixture to reduce the temperature, and the mixture is ground. The invention adopts lower refining temperature to prepare the complex lithium grease with high dropping point, so as to not only save the power resource, but also have the equivalent performances compared with the grease prepared by the prior art. Meanwhile, the method reduces the oxidation of lubricating oil when in the preparation process and improves the oxidation stability of the grease.

Description

technical field [0001] The invention belongs to a preparation method of lubricating grease. Background technique [0002] With the requirements of miniaturization, light weight, precision, low noise, and long life of mechanical equipment, the rotating parts of the machine are not only smaller in size and faster in rotation speed, but also the very concentrated parts make the ambient temperature very high , Such harsh working conditions put forward strict requirements on the grease used. Therefore, the requirements of heat resistance and long life cannot be met for general lithium-based greases. The lithium complex grease has many excellent properties, such as: thermal stability, oxidation stability, colloidal stability, mechanical stability, etc., and is also widely used in many industries. [0003] At present, people usually use high temperature refining process to prepare high dropping point lithium complex grease. For example: in the USP5391309 patent, a pressure kettl...

Claims

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Application Information

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IPC IPC(8): C10M117/00C10M177/00C10M101/00
Inventor 姚立丹杨海宁
Owner CHINA PETROLEUM & CHEM CORP
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