High-temperature extreme-pressure bentonite grease lubricant

Abstract

The invention relates to a high-temperature extreme-pressure bentonite grease lubricant. The grease lubricant comprises the following components, by weight 80-95% of base oil, 5-15% of a thickener, 5-20% of an extreme pressure additive and 10-30% of an active dispersant, wherein the base oil is one of a mineral oil and a synthetic oil or a mixture of the two oils, and the extreme pressure additive is a solid lubricant. A preparation method of the grease lubricant comprises the following steps: fully stirring the base oil and the extreme pressure additive to uniformly mix them, adding the thickener, continuously fully stirring to uniformly mix, adding the active dispersant, stir-mixing for a certain amount of time, and grinding to uniformly disperse to obtain the grease lubricant. The grease lubricant of the invention has good high temperature performances, a good colloid stability, and a good mechanical stability, and is especially suitable for mechanical lubrication parts working under high-temperature heavy-load high-pollution conditions.

Description

technical field [0001] The invention relates to the technical field of lubricating grease, in particular to an extreme pressure bentonite lubricating grease. Background technique [0002] Grease is a grease-like semi-solid with a certain viscosity, which is mainly prepared from mineral oil (or synthetic lubricating oil) and a thickener. It can be divided into soap-based grease and non-soap based grease according to the thickener. There are two types of base grease. Bentonite grease belongs to non-soap base grease. It is made of organic bentonite thickened medium-viscosity or high-viscosity mineral oil after surfactant treatment. It is widely used in mining, metallurgy, casting and steel rolling, etc. Heavy-duty machinery and equipment in the industry, as well as heavy-duty vehicles, paper machinery, cement production equipment, high-temperature tunnel kiln cars, aircraft wheel bearings, railway diesel locomotives and other equipment lubrication parts. [0003] Bentonite gre...

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Problems solved by technology

[0006] 3) The structural particles of bentonite grease are more resistant to shearing than soap fibers. However, since bentonite has been treated with surfactants, the mechanical stability of bentonite grease varies with the performance of different surfactants. Used in rolling bearings, bentonite grease tends to become thinner and flow out

[0007] 4) The corrosion resistance of bentonite grease to the metal surface is not good, and an effective antirust agent must be added to improve

[0008] 5) Bentonite grease is firmly combined with the base oil. On the one hand, it shows excellent colloidal stability. On the other hand, it shows that the base oil is difficult to enter the friction surface, so the wear resistance and scratch resistance are not ideal. , affecting its use in high-speed rolling bearings

However, existing bentonite lubricating grease still has some deficiencies in the actual use process, such as the dropping point is not high enough, the stability is poor, especially the extreme pressure and anti-wear performance, that is, to prevent or reduce the wear of the metal surface under moderate load conditions, Prevent sintering, seizure, and scratching of the metal surface under high-load conditions, but these properties of the existing bentonite grease are still difficult to meet the requirements for use

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