The difference between molybdenum disulfide grease and lithium-based grease

Molybdenum disulfide grease and lithium-based grease show significant differences in composition, performance, and application. Here is a detailed comparative analysis:

1. Composition

Molybdenum disulfide grease: This kind of grease is added with molybdenum disulfide (MoS2) micro powder on the basis of ordinary grease. Molybdenum disulfide is a black solid lubricant with excellent extreme pressure and anti-wear properties. Therefore, molybdenum disulfide grease usually appears black.

Lithium-based grease: Lithium-based grease is made by using lithium soap (usually fatty acid lithium soap) as a thickener, mineral oil or synthetic oil as the base oil, and adding various additives (such as antioxidants, rust inhibitors) Made of grease. The color of lithium grease is usually gray to dark gray, depending on the type and content of additives.

2. Performance characteristics

Molybdenum disulfide grease:

Extreme pressure and anti-wear properties: Due to the addition of molybdenum disulfide, this grease has excellent extreme pressure and anti-wear properties and is suitable for the lubrication of heavy-duty equipment.

High temperature performance: Molybdenum disulfide grease may begin to oxidize in high temperature environments (such as above 200°C), thus affecting the lubrication performance. Therefore, it is not suitable as an additive for high-temperature greases.

Wetting: In humid environments, the performance of molybdenum disulfide greases may be affected.

Lithium grease:

High temperature resistance: Lithium-based grease has good high temperature resistance and can maintain stable lubrication effect at higher temperatures. For example, the service temperature range of ordinary lithium-based grease is usually -20°C to 120°C.

Water resistance: Lithium-based grease has good water resistance and can maintain good lubrication performance in humid environments.

Mechanical stability: Lithium-based grease has good mechanical stability and oxidative stability, which can ensure a long grease change cycle.

3. Application scenarios

Molybdenum disulfide grease: suitable for lubrication of mechanical equipment under severe working conditions such as heavy load and impact load, such as mining machinery, metallurgical equipment, transportation tools, etc. In addition, certain environments that require high-temperature operation can also produce special molybdenum disulfide grease with higher temperature resistance by adding specific additives.

Lithium-based grease: widely used in the lubrication of various mechanical equipment, especially under high temperature and heavy load conditions. Common applications include automobiles, ships, motorcycles, and aerospace.

4. Precautions for use

Mixed use: Different types of grease should not be mixed. In particular, mixing molybdenum disulfide grease with other greases may cause damage to the colloidal structure and affect performance. If the grease needs to be replaced, the old grease should be thoroughly cleaned before adding new grease.

Packaging specifications: Common grease packaging specifications include 1 kg in a can, 10 kg/small barrel, 20 kg/medium barrel and 180 kg/large barrel. Users can choose the appropriate packaging according to their needs.

5. Select suggestions

Selection based on working conditions: For equipment with heavy loads and impact loads, it is recommended to choose lithium molybdenum disulfide-based grease to obtain better extreme pressure and anti-wear performance.

Consider temperature and environment: In high temperature or humid environments, it is recommended to choose a lithium-based grease that is resistant to high temperatures and water.

Pay attention to brand and quality: Choose grease from well-known brands (such as Swedish Bissenu, Kluber, HOTOLUBE, Flowserve, Great Wall, etc.) to ensure quality and performance.Through the above comparative analysis, users can choose the most suitable grease according to actual needs to improve the lubrication effect and service life of the equipment.