The difference between lithium-based grease and high-temperature grease

General-purpose high-temperature lithium-based grease is divided into 1#, 2#, and 3# according to the consistency grade. It has good water resistance, mechanical stability, corrosion resistance and oxidation stability, and is suitable for the lubrication of rolling and sliding bearings and other friction parts of various mechanical equipment within the working temperature range of -20 to 120°C.

The characteristics of general high temperature lithium grease are as follows:

(1) Lithium-based grease, especially grease thickened with lithium 12-hydroxystearate, has only two phase transition temperatures. The first phase transition temperature (i.e. from pseudo-gel state to gel state) is generally between Above 170°C, the second phase transition temperature (i.e. from gel state to sol state) is generally above 200°C. Therefore, when appropriate mineral oil is selected, it can be used at 120°C for a long time or 150°C for a short period of time.

(2) Lithium-based grease, especially grease thickened with lithium 12-hydroxystearate, has good mechanical properties. Stability.

(3) The adsorption heat of 12-hydroxylithium stearate and lithium stearate to alkanes was determined by gas chromatography. It was found that the binding strength of 12-hydroxylithium stearate and lithium stearate to the liquid phase on the surface of soap fibers. , and the bonding strength to the liquid phase in the crystal lattice is relatively large. Therefore, lithium-based grease has good colloidal stability.

The difference between No. 1, No. 2 and No. 3 high-temperature lithium-based grease:

1. The difference between soft and hard: Butter No. 1, 2 and 3 are just its NKGI number, that is, the penetration. No. 2 is 265-295, the most commonly used, and No. 3 is 220-250, which is harder. , usually used in applications requiring resistance to water or solid impurity contamination to reduce equipment wear.

2. Difference in process: 3# is harder and can be applied by hand. 2# is a little softer and harder. It can be added by machine or applied by hand. There is no difference in performance.

3. Differences in use: According to NLGI classification, cone penetration (penetration), grease ranges from #000 to #6. The larger the number, the harder the grease. #2 is common lubrication, #3 is used for lubrication of bearings with heavy loads or vertical motors.

4. Difference in temperature resistance: The physical and chemical properties of No. 3 lithium-based grease and No. 2 lithium-based grease are similar. The main difference is based on the dropping point temperature (which can also be understood as high temperature resistance). The one with a higher number has a higher temperature resistance.

Precautions:

1. Lithium-based grease should not be packed in large containers to avoid oil precipitation. If there is a small amount of oil precipitation, it can be stirred or ground evenly at room temperature before use.

2. Do not mix it with other lipids.

3. Avoid contact between new grease or used grease products and skin. If in contact, clean thoroughly with water and soap.

4. Do not inhale product vapor and do not let the product stain clothes. Waste grease should be properly disposed of to protect the environment.

All in all, this depends on the speed and environment of the bearing. If the speed is fast, you must choose one with better adhesion. If it works under high temperature conditions, you must use high-temperature bearing grease, which is resistant to oxidation and does not form coke and carbon deposits. ; Low temperature requires the use of low-temperature bearing grease. Those that produce food or occasionally come into contact with food must use grease with NSF food grade certification. The specific selection should be based on needs. There is no best grease, only suitable grease.