Extreme pressure and anti-wear properties of organic bismuth compounds

With the development of modern science and technology and oil application technology, the performance requirements of oil products are getting higher and higher. For modern lubricating oil products, in addition to excellent extreme pressure and anti-wear properties, In addition to antioxidant and stability properties, it also requires good environmental adaptability and green environmental protection properties.

For many years, sulfur and phosphorus additives have occupied a dominant position in extreme pressure and anti-wear additives for lubricating greases due to their excellent lubricating properties. However, with the improvement of people’s environmental awareness and the increasingly stringent environmental regulations, the use of sulfur and phosphorus additives has been subject to increasingly strict restrictions due to major environmental pollution problems. In order to reduce corrosion caused by sulfur components and the emission of acidic components and the impact of phosphorus-containing substances on exhaust purification devices. The search for new additives that can replace or reduce the content of sulfur and phosphorus components has become a hot topic in current research.

Bismuth is a non-toxic heavy metal. Its use can greatly reduce the content of sulfur components in additives. The combination of bismuth compounds and organic sulfur can be used when the sulfur content is low. Obtain high strength extreme pressure bearing performance.

In addition, bismuth compounds can also be used in certain high extreme pressure situations. The sulfur-bismuth compound agent replaces the sulfur-lead compound agent to reduce the impact of lead on the human body. Hazardous, and has better performance than sulfur lead additives. Sulfur-bismuth additives have developed rapidly internationally in recent years and have attracted people’s attention due to their excellent extreme pressure lubrication properties.

There are relatively few domestic studies. For this reason, we have conducted research on bismuth naphthenate additives that have been used in foreign products and have shown good performance. , its synthesis process method, single-agent lubrication performance and synergistic performance with vulcanized isobutylene, ZDDP and other additives were discussed.