Preparation method of complex lithium grease

Abstract

The invention relates to a preparation method of complex lithium grease. The preparation method comprises the following steps: adding one third of total base oil or synthetic oil, 12 hydroxy stearic acid, binary acid, lithium hydroxide and water to an autoclave, sealing, stirring, heating and pressurizing the materials to carry out saponification; after saponification is completed, relieving the pressure, adding boric acid and stirring the materials; adding one third of total base oil or synthetic oil and stirring and heating the materials to carry out constant temperature refining; adding the remaining base oil or synthetic oil, reducing the temperature, adjusting the consistency, adding an antioxidant and antirust agents and obtaining the finished product after cyclic shearing or mechanical grinding. The preparation method has the beneficial effects that the problems that the dropping point of the complex lithium grease is low and additives are needed for achieving antifriction and antiwear properties in traditional preparation processes are solved; under the condition of not adding antifriction antiwear agents, the dropping point and antifriction and antiwear properties of the complex lithium grease are increased by changing the addition process of the boric acid, so that the complex lithium grease can meet the lubricating requirement under the severe conditions that the operating temperature is higher than 260 DEG C and the PB value is more than 980N.

Description

technical field [0001] The invention relates to a preparation method of a composite lithium-based lubricating grease, in particular to a preparation method of a composite lithium-based lubricating grease which improves the dropping point and anti-friction and anti-wear properties without adding a friction-reducing and anti-wear agent. Background technique [0002] With the development of modern industrial technology, steel, automobile, textile and other industries have put forward higher requirements for the high and low temperature performance, anti-friction and anti-wear performance of lubricating grease. At present, lithium-based lubricating grease can no longer meet high temperature, high speed and heavy load. In the harsh working conditions, ordinary lithium complex greases have certain advantages over lithium-based greases in the process of use, but due to the low dropping point and poor anti-friction and anti-wear properties, it is difficult to meet the use requirement...

AI Technical Summary

Problems solved by technology

[0002] With the development of modern industrial technology, steel, automobile, textile and other industries have put forward higher requirements for the high and low temperature performance, anti-friction and anti-wear performance of lubricating grease. At present, lithium-based lubricating grease can no longer meet high temperature, high speed and heavy load. In the harsh working conditions, ordinary lithium complex greases have certain advantages over lithium-based greases in the process of use, but due to the low dropping point and poor anti-friction and anti-wear properties, it is difficult to meet the use requirements. In order to meet the requirements of harsh working conditions, it is necessary to add a variety of anti-wear extreme pressure additives to the complex lithium-based grease

[0003] At present, lithium-composite greases are developing rapidly in my country, basically replacing lithium-based greases. There are many reports on lithium-composite greases at home and abroad, and patents about lithium-composite greases are constantly emerging, such as the U.S. Patent Application Publication US3681242, US3711407, US3929651; Chinese Patent Application Publication CN1052890A, CN1052891A, the composition of these lithium complex greases is basically the same, with 12 hydroxystearic acid and dibasic acid (azelaic acid, sebacic acid) to form two components, Salicylic acid and boric acid are also added to form three components. The preparation method is to add the materials together and react with lithium hydroxide to form a compound. The dropping point of the compound lithium-based grease prepared in this way is not high, only reaching 260-280 ° C. Left and right, the anti-friction and anti-wear properties are not outstanding, and the PB value does not exceed 980N. However, modern industrial equipment has put forward higher requirements for the use temperature and anti-friction and anti-wear properties. 12 hydroxystearic acid, sebacic acid , boric acid and other materials are added at the same time in the traditional preparation process, in order to meet the requirements of use, it is necessary to add anti-friction and anti-wear agents

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