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Thickeners&Viscosity Index Improvers
Viscosity index improver (as VIIs) or viscosity modifier is a polymer additive used in lubricants. Its function is to reduce the impact of temperature changes on viscosity. CheMost china manufacturers custom.
What are the viscosity index improvers?
Viscosity index improvers additives that help keep lubricants working well over a wider range of temperatures.
Think about it this way: oil gets thinner when it's hot and thicker when it's cold. That's just how it is. But that can be a problem for engines and other machinery. If the oil gets too thin at high temperatures, it won't properly protect the moving parts, and that can lead to wear and tear.
That's where viscosity index improvers come in. They're special ingredients added to the oil to help it maintain a more consistent thickness, or viscosity, even as the temperature changes. The goal is to keep the oil thick enough to provide good lubrication at high temperatures, but not so thick that it causes drag and reduces fuel efficiency at low temperatures.
People started messing around with additives way back in the 1930s. They found that adding certain long-chain molecules could help keep oil from thinning out too much when things got hot. These additives were first put in gear and hydraulic oils.
Over time, scientists made a bunch of different types of these additives. The major ones are polyisobutylene (PIB), polymethacrylate (PMA), olefin copolymers (OCP), and hydrogenated styrene diene copolymers (HSD). You'll still find these guys doing the heavy lifting in modern lubricating oils. Each works a little differently, but the basic idea is the same: to help the oil maintain its viscosity, preventing components from grinding each other to dust.
Viscosity index improvers are polymer ingredients that keep lubricants at the right thickness, even when temperatures change a lot. They're basically long molecules that get bigger or smaller depending on the temperature, which helps control how the lubricant works.
They're also known by these names:
* OCP viscosity index improver (Olefin Copolymer)
* PMA viscosity index improver (Polymethacrylate)
* HSD viscosity index improver (Hydrogenated Styrene-Diene)
* PIB viscosity index improver (Polyisobutylene)
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