viscosity improver polymers lubricant polymer additives vi improvers

Description

Viscosity improver polymers, also known as viscosity index improvers (VI improvers), are additives used in lubricants to control the viscosity-temperature relationship. They are typically high molecular weight polymers that help maintain the lubricant’s viscosity over a wide temperature range.

At low temperatures, viscosity modifier polymers reduce the lubricant’s tendency to thicken, ensuring proper lubrication and flow. They help maintain fluidity and prevent the lubricant from becoming too thick and difficult to pump or flow at low temperatures.

At high temperatures, viscosity modifiers prevent the lubricant from over-thinning, maintain its critical film thickness and provide adequate protection of metal surfaces. They help maintain lubrication properties and prevent the lubricant from losing viscosity under high shear conditions.

The purpose of viscosity modifier polymers is to thicken the lubricant at high temperatures and reduce its viscosity at low temperatures. This temperature-dependent thickening and thinning behavior helps the lubricant maintain a consistent viscosity over a range of operating temperatures.

In addition to controlling the viscosity-temperature relationship, viscosity modifier polymers can help reduce wear, improve fuel efficiency, increase load-carrying capacity, and enhance the overall performance of the lubricant. They are commonly used in engine oils, gear oils, hydraulic oils and other lubricants to meet the demanding requirements of modern machinery and equipment.