Firstly, friction modifier is an additive to reduce the friction coefficient of lubricating oil under boundary lubrication conditions. Its main function is to form a lubrication protective film on the metal surface, avoid direct contact between metal bumps, reduce the friction coefficient under mixed lubrication and boundary lubrication, and reduce friction resistance and wear. To save fuel.

Secondly, the friction modifier must have the ability to improve various properties, such as reducing friction to improve fuel efficiency, improving the durability of mechanical friction to maintain the performance of improving fuel economy in a longer oil change cycle, and finally reducing wear to make a contribution to the use of lower SAPS.

What are the configurations of friction modifiers, such as solubility in base oils, solubility in antiwear additives, solubility in inorganic FMs, and solubility in composite packages?

The main difference between different friction modifiers is that molybdenum-based organometallic compounds are very active in boundary lubrication, but organic friction modifiers are more active in mixed lubrication. In fact, the effect of organic friction modifier is greater than that of using low viscosity oil to compensate for the growth of mixed lubrication state. To some extent, molybdenum-based metal compounds exhibit the same effect as organic friction modifiers, but the latter exhibit very small friction coefficients in mixed lubrication, especially under the harshest conditions of low speed and high load. Organic friction modifiers mainly act as absorption layers, which occur at relatively low temperatures. Molybdenum compounds act in the form of molybdenum disulfide polymers, which can only occur at high temperature. In addition, although molybdenum-based metal compounds can improve fuel economy, it is not expected that the addition of molybdenum-based metal compounds to base oils or full-formula engine oils will increase TEOST deposit levels. In addition, although molybdenum-based metal compound friction modifier is widely used in Japan and can improve fuel economy by 0.3%, the program VIB engine test limits its use, so it is more important to select effective organic friction modifier to improve fuel economy.

Let's make these summaries for the time being. If there are any shortcomings, I hope you can correct them and give me your advice. Thank you.