Method for preparing lithium lubricating grease

A lithium-based grease, the technology of lubricating grease, applied in the direction of lubricating composition, petroleum industry, etc., can solve the problems of waste, dehydration time and energy consumption increase, and achieve the effect of reducing energy consumption and widening development space

Active Publication Date: 2012-11-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents all need to use a large amount of water to achieve saturation or fully dissolve lithium hydroxide monohydrate crystals, and the water will be evaporated in the subsequent dehydration process, which will inevitably greatly increase the dehydration time and energy consumption, resulting in waste

Method used

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  • Method for preparing lithium lubricating grease
  • Method for preparing lithium lubricating grease
  • Method for preparing lithium lubricating grease

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 250g reduced third-line base oil (100℃ viscosity 8.555mm 2 / s) Add 60g of 12-hydroxystearic acid to the fat making kettle, heat up and stir evenly; add 4.4g of lithium hydroxide monohydrate crystals at 60℃, mix well, add lithium hydroxide solution at 85℃ (dissolve in 20g of water) 4.4g lithium hydroxide), proceed with the reaction; continue heating and dehydration, after the water has evaporated, continue heating to 210°C, add 190g of reduced third-line quenching oil, start cooling, and cool to 120°C, add 2.5g of 2,6 di-tert-butyl Based on p-cresol antioxidant, mix well and grind three times to obtain the finished lubricating grease. The physical and chemical performance data are shown in Table 2.

Embodiment 2

[0020] 200g PAO base oil (100℃ viscosity 6.128mm 2 / s) Add to the fat making kettle, then add 45g of 12 hydroxystearic acid and 15g of sebacic acid, heat up and stir evenly; add 5g of lithium hydroxide monohydrate crystals at 70°C, mix well, and add hydrogen dropwise at 93°C Lithium solution (8g lithium hydroxide dissolved in 43g water), proceed with the reaction; continue heating and dehydration, after the water evaporates, continue heating to 210°C, add 240g of PAO quench oil, start cooling, and add 2.5g of diphenylamine to 120°C Antioxidant and 0.5g of T706 rust inhibitor were mixed evenly and ground three times to obtain the finished lubricating grease. The physical and chemical performance data are shown in Table 2.

Embodiment 3

[0022] 800g 500SN base oil (100℃ viscosity 10.566mm 2 / s) Add to the fat making kettle, then add 135g of 12 hydroxystearic acid and 45g of sebacic acid, heat up and stir evenly; add 15g of lithium hydroxide monohydrate crystals at 70°C, mix well, and add hydrogen dropwise at 90°C Lithium solution (25g lithium hydroxide dissolved in 125g water), proceed to the reaction; continue to heat up the dehydration, after the water has evaporated, continue to heat up to 210°C, add 520g of 150BS (100°C viscosity 31.584mm) 2 / s) Quickly cool the oil, start to cool down, add 30g of diisooctyldiphenylamine antioxidant and 7.5g of T706 rust inhibitor, mix well, grind three times to obtain the finished grease, see the physical and chemical performance data Table 2.

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Abstract

The invention provides a method for preparing lithium lubricating grease. The method comprises the following steps of: 1) adding one third to one second of the weight of the entire base oil into a grease kettle, adding a calculated amount of monobasic acid or monobasic acid and at least one kind of dibasic acid or polybasic acid, raising the temperature, and stirring to ensure that the acid and the base oil are fully mixed; 2) raising the temperature to 40 to 80 DEG C, adding one third to one second of a calculated amount of lithium hydroxide monohydrate crystals under stirring, and fully mixing; 3) raising the temperature to 82 to 120 DEG C, and adding an aqueous solution of residual lithium hydroxide monohydrate for saponification reaction; and 4) after full saponification reaction, raising the temperature and dehydrating, continuing to raise the temperature to 200 to 220 DEG C, adding the residual base oil serving as quenching oil, reducing the temperature and cooling, adding necessary additives, homogenizing, grinding, and degassing to obtain finished lubricating grease. The method for preparing the lithium lubricating grease has the advantages of energy conservation, emission reduction and energy consumption reduction, can be used for lithium or complex lithium lubricating grease, and is particularly suitable for a process for preparing the lithium or complex lithium lubricating grease in an atmospheric kettle.

Description

Technical field [0001] The invention relates to a preparation method of lithium-based grease. Background technique [0002] Since its introduction, lithium-based (including complex lithium-based) grease has been widely used in countries all over the world for its excellent performance, and its output is the first of all types of grease. It has good water resistance, heat resistance, mechanical stability and oxidation stability, a long service life, and a wide range. It is an ideal multi-purpose, long-life grease. [0003] Lithium-based grease preparation methods can be divided into atmospheric pressure method, pressure method and contactor method according to the grease-making equipment used. The atmospheric pressure method is a simple and easy-to-implement process because it does not require high equipment and is widely used in various grease factories . The common preparation method is to heat up part of the base oil and 12-hydroxystearic acid or stearic acid or their mixture (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/06C10M177/00C10N50/10
Inventor 刘大军潘卓孙洪伟段庆华王平
Owner CHINA PETROLEUM & CHEM CORP
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