Name any four additives in blended oil and give two examples of each.

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written 4.6 years ago by

teamques10 ★ 70k

Additives in blended oil:

Vegetable / animal / mineral oils, alone are not found suitable to meet requirements of machines. Hence, it is essential to prepare blended oils to suit the working conditions of machines.
Blending agents are used to improve properties such as viscosity index, oxidation stability, oiliness, pour point, flash point etc.
Other additives such as corrosion/abrasion inhibitors, antifoaming agents, emulsifiers etc. are also mixed in appropriate proportion in blends.
In addition to this, certain additives are added so that extreme pressure conditions of machineries can also get suitable lubricants.

The Following Table shows the substances/compounds commonly used to improve the properties of the lubricants i.e. of blend, [including EPT additives]

Property to be improved	Additives Substances/Compounds	Improvement
Oxidation stability	Aromatic amine, phenols, organic sulphides/ phosphides etc.	They retard oxidation of oil, hut they themselves get oxidized preferentially, e.g. in internal combustion engines where lubricants tend to get oxidised.
Corrosion / Abrasion stability.	Organic compounds of phosphorous or antimony.	They form a layer between the sliding surfaces thereby not allowing contact between the surfaces.
Viscosity index improvers.	High molecular weight organic compounds e.g. haxanol.	Viscosity stabilises
Viscosity improvers.	Polystyrene, Polyesters etc.	They act as thickeners.
Oiliness carriers	Vegetable oils, fatty acids / amines.
Rust inhibitors	Fatty acids, Aminophosphates.	Rusting is controlled.
Antiwear additives	Substances liketricresylphosphate, Zn-dialkyl di thiophosphate.	Wear of machines is controlled.

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