Preparation method of high shear stability lithium grease

Abstract

The invention discloses a preparation method of high shear stability lithium grease, comprising the following steps: saponifying, heating to dehydrate, refining at high temperature, quenching sharply to mix, standing, mixing into grease, shearing, homogenizing, re-shearing and deaerating. The preparation method of high shear stability lithium grease adds the steps of standing and recutting and overcomes the defect of uneven growth of soap fibers in the traditional lithium grease production technology, and the length of the soap fibers has a proper proportion, therefore, a three-dimensional cavity formed by the soap fibers can absorb a large amount of base oil, and an orienting arrayed crystal fiber structure is formed. When the good colloid stability of the lithium grease is ensured, the lithium grease has prominent high shear stability, the penetration change rate of 100 thousand time extended work is less than 8 percent, a bearing grease exchanging period can be extended above 2000 hours / time from 500 hours / time generally, and the service life of mechanical equipment can be prolonged by 4-5 times.

Description

technical field [0001] The invention relates to a preparation method of lubricating grease, in particular to a preparation method of lithium-based lubricating grease with high shear stability. Background technique [0002] The shear stability of lubricating grease refers to the ability of lubricating grease to resist the change of consistency under the action of certain mechanical shear force. The shear stability is related to the fiber structure strength of lubricating grease and the adsorption force between fibers. An important indicator of mechanical stability and service life. [0003] At present, the working conditions of using pressure saponification kettle to produce lithium-based lubricating grease tend to be mature, and most of them use saponification, heating and dehydration, high-temperature refining, rapid cooling and mixing, blending into fat, grinding and homogenization, degassing and other processes, all of which use 12-hydroxy Lithium stearate soap or lithiu...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a preparation method of high-shear stability lithium-based lubricating grease, which overcomes the defect of non-uniform soap fiber growth in the traditional lithium-based lubricating grease production process, makes the length of soap fiber have an appropriate ratio, and satisfies the requirement of soap fiber The formed three-dimensional cavities can not only absorb a large amount of base oil, but also form a directional arrangement of crystal fiber structure, so that the product has outstanding high shear stability on the basis of ensuring good colloidal stability, and the change of the cone penetration can be extended for 100,000 times rate less than 8%