It is worth noting that the direct danger of using over-temperature lubricating oil is to accelerate oxidation degradation and produce acidic substances. If local high temperature occurs at the lubrication point, the oxidation degradation of the grease will occur and gradually spread. Local high temperature may cause incorrect bearing installation, or excessive or insufficient grease, or incorrect oil selection, vibration, or overload.
The oxidized color of the grease becomes darker, and acidic substances cause the thickener to decompose, causing the base oil to fall off from the thickener. Grease is actually a thickened lubricant. The thickener absorbs basic oil like a sponge to prevent excessive loss. Therefore, lubrication mainly depends on oil lubrication. If the base oil is reduced, there is grease on the surface, but there is almost no lubricating power, and changes in Greek consistency such as solidification, dilution or flow during the oxidation process can be observed. General lubricating greases are usually prepared with lithium-based thickeners and mineral oil to meet the lubrication requirements of most general working conditions. When there is a high temperature (above 60 degrees Celsius), the grease accelerates oxidation. When it is close to 90 degrees Celsius, the Greek oxidation seriously limits the performance of Greece. In this case, better grease should be used, generally synthetic oil and lithium complex , Polyurea, complex calcium sulfonate and other advanced thickeners. The performance of this kind of grease at normal temperature and high temperature is better than ordinary grease.
The temperature characteristics of lubricating grease are also different within the range of grease use. As mentioned above, grease is mainly lubricated by base oil. If the base oil has better viscosity temperature characteristics (high viscosity index), the viscosity will be relatively stable during temperature changes. There are currently 5 classifications of base oils according to the API. Users must understand the base oil composition of the grease when purchasing.
The main components of grease are base oil and thickener, but the degree to which the base oil and thickener are affected by temperature is different. Generally speaking, the base oil is relatively more affected by temperature changes, but for the consistency of the thickener, the consistency changes more slowly until it reaches a viscosity. Therefore, when buying grease, you must understand the performance of the base oil.
Baoxing Lubricant's high-temperature lubricating grease series products have excellent product performance. Welcome to inquire.
