Base oil is an essential part of fluids used for the production of lubricants. Physical and chemical characterizations of base oil define the final application where lubricants are meant to perform. In ideal condition, a high viscosity index that is required to preserve viscosity against temperature variation and low sulfur content which is needed to avoid poisonous gaseous development and to perform high fluidity at low-temperature are the major specifications expected from lubricants. The below figure illustrates the effects of various base oil specifications on finished lubricants.
Mineral base oils are extracted from the crude oil during refining process or catalytic reactions.
Synthetic Base oils (Group IV & V & VI) are extracted from chemical processes, mainly polymerization of petrochemical raw materials. The major products are: ♦ Polyaiphaolephin (PAO) ♦ Diesters ♦ Polyol esters ♦ Phospate esters ♦ Polyalkylene glycols (PAG) ♦ Alkylated Aromatics ♦ Silicons
Natural Base oils are tri-glyceride based structure (Oleochemichals) that are driven from vegetables or animal based fat such as castor oil, palm oil, cotton seed oil and each will serve certain application in industries. Due to high lubricity and natural anti-wear characteristic of these products they can either be used alone or in combination with other mineral oils. Their chemical structures...