What are the additives added to lubricants?
The major functional additive types are dispersants, detergents, oxidation inhibitors, antiwear agents, extreme-pressure additives, and viscosity index improvers.
What are Lubricant Additives list three lubricant additives?
Conventional Lubricant Additives
- Anti-oxidants. Oxidation is the general attack of the weakest components of the base oil by oxygen in the air.
- Rust and Corrosion Inhibitors.
- Viscosity Index Improvers.
- Anti-wear (AW) Agents.
- Extreme Pressure (EP) Additives.
- Detergents.
- Dispersants.
- Anti-foaming Agents.
What are examples of additives oil?
Examples include:
- Zinc dialkyl dithiophosphate (ZDDP)
- Chlorinated paraffins.
- Sulfurized lard oils.
- Phosphate esters.
- Overbased calcium sulfonates.
What is a hydrodynamic lubrication?
Hydrodynamic lubrication occurs when non-parallel rigid bearing surfaces lubricated by a film-fluid slide over each other, forming a converging wedge of fluid and forming a lifting pressure (Williams, 1994).
What is lubricating agent?
The term lubricant or lubricating agent is often encountered to describe certain additives incorporated into plastics materials. Such materials, known commonly as external lubricants, have a low compatibility with the polymer and in addition often possess polar groups to enhance their affinity to metals.
Which are the two most common additives used in general purpose oils?
These primarily include enhancing the existing desirable properties, suppressing the existing undesirable properties, and imparting new properties. The most common additives are oxidation and rust inhibitors, extreme pressure, antiwear, and friction-reducing agents.
What is thick film lubrication?
Hydrodynamic Lubrication or Thick Film Lubrication Hydrodynamic lubrication is said to exist when the moving surfaces are separated by the pressure of a continuous unbroken film or layer of lubrication. In this type of lubrication, the load is taken completely by the oil film.
What drugs are lubricating agents?
Magnesium stearate is a widely used lubricant….13.1. 5.8 Lubricants.
| Water-insoluble lubricants | Usual concentration (%) |
|---|---|
| Stearates (magnesium stearate, calcium stearate, sodium stearate) | 0.25–1 |
| Talc | 5 |
| SLS | 1–3 |
Which one of the following is used as a lubricant?
The correct answer is Graphite. Graphite is used as a lubricant because of its slippery nature.
What is an additive in an engine lubricant?
ATC defines engine lubricant additives as: A chemical substance or prepared mixture, added to base oil, in concentrations typically ranging from 0.05 to 30 wt%, to impart or enhance the chemical and physical properties for usage in a combustion engine.
How are VI improvers used in lubricant additives?
In addition, VI improvers are used to achieve high-VI hydraulic and gear oils for improved start-up and lubrication at low temperatures. To visualize how a VI-improver additive functions, think of the VI improver as an octopus or coil spring that stays coiled up in a ball at low temperatures and has very little effect on the oil viscosity.
Why do we need anti wear lubricant additives?
Not only to avoid high maintenance costs, but also to guarantee a high degree of reliability, powerful wear protection of the moving machine parts is required. The portfolio of our Additin ® Anti Wear (AW) wear protection additives is as broad as the requirements of the various industries.
Why are polar additives used in boundary lubricant?
These additives are typically used to protect machine parts from wear and loss of metal during boundary lubrication conditions. They are polar additives that attach to frictional metal surfaces. They react chemically with the metal surfaces when metal-to-metal contact occurs in conditions of mixed and boundary lubrication.