High-extreme pressure water-resistant antirust lubricating grease and preparation method thereof

Abstract

The invention relates to high-extreme pressure water-resistant antirust lubricating grease and a preparation method thereof. The high-extreme pressure water-resistant antirust lubricating grease is prepared by the reaction of various substances by weight parts as follows: 43.5-77.5 parts of high-viscosity mineral oil, 7-10 parts of fatty acid, 0.7-1.0 part of lithium hydroxide, 0.3-0.5 part of calcium hydroxide, 10-30 parts of high base number calcium petroleum sulfonate, 1-3 parts of transforming agent, 1-3 parts of antirust agent, 1-3 parts of extreme-pressure additive, 0.5-1.0 part of antioxidant, and 1-5 parts of thickening agent. In the invention, the water comprehensive stability and water antirust performance of the lubricating grease are improved, and the water stability of the thickening agent and the extreme-pressure additive is improved.

Description

technical field [0001] The invention relates to a high extreme pressure anti-water and anti-rust lubricating grease and a preparation method thereof, which are widely used in work roll bearings of steel rolling mills and production lines of steelmaking plants. Background technique [0002] Steel rolling mills are generally divided into medium and heavy plate mills, hot-rolled strip mills, cold-rolling mills, section steel mills, wire rod mills, seamless steel pipe mills, etc. according to different product specifications. Their common feature is that the work roll bearings are mostly lubricated with dry oil, and the working conditions are harsh. The temperature of the hot billet is generally 800-1000°C, and the rolling load can reach 1000-3500 tons. There is a large amount of cooling water or rolling emulsion washing and dust erosion on the work roll bearings, and the maximum water intake can reach 25%. [0003] Greases used for work roll bearings are generally extreme pres...

AI Technical Summary

Problems solved by technology

Due to the limited water resistance of these greases, there are three disadvantages: thinning and loss, bearing rust, and extreme pressure drop

The specific instructions are as follows: (1) Ordinary extreme pressure grease will become thinner and lost under the joint action of water and bearing shear, resulting in insufficient lubrication of the bearing, decreased sealing performance, and impurities such as dust will more easily enter the bearing, causing bearing failure. abnormal wear and tear

(2) The bearing will also rust or corrode due to the action of water

(3) The polarity of water is strong, competing with the extreme pressure agent for the metal surface will greatly affect the effect of the extreme pressure additive; water will also cause the hydrolysis of the extreme pressure agent to produce organic acids to corrode the bearing

Therefore, the extreme pressure performance of grease mixed with water will be greatly reduced

[0004] These unfavorable conditions such as watery, dusty, and heavy loads have a great impact on the bearings of rolling equipment, and the cost of replacing spare parts is also staggering. Therefore, higher requirements are placed on the performance of the lubricating grease used in the bearings.

CN1235631A uses molybdenum thiophosphate to improve the extreme pressure and wear resistance of grease, but does not solve the problem of limited water resistance of grease