The tanker says three types of oil. What is the three kind of oil?
III base oils are prepared by full hydrogenation process. Compared with II base oils, the base oils are high viscosity index hydrogenated base oils, also called unconventional base oils (UCBO). Class III base oils are far superior in performance to class I base oils and class II base oils, especially with a high viscosity index and very low volatility. Certain III oils are comparable in performance to poly alpha olefins (PAO), but they are much cheaper than synthetic oils.
Class II base oils are prepared by combined process (solvent process and hydrogenation process). The process is mainly based on chemical processes, without material restriction, which can change the original hydrocarbon structure. The II base oil less impurities (aromatics content is less than 10%), high saturated hydrocarbon content, thermal stability and oxidation resistance, low temperature and soot dispersion properties are better than that of I base oil.
I base oil is usually from the traditional "old three" production processes, from the production process, the production process of I base oil with the basic physical process, without changing the structure of the base oil hydrocarbons, production quality depends on the content and properties of the ideal components of raw materials. As a result, this type of base oil is limited in performance.
Class IV base oils refer to poly (alpha olefin) (PAO) synthetic oils. The commonly used methods of production are paraffin decomposition and ethylene polymerization. Depending on the degree of polymerization, PAO can be divided into oligomerization degree, medium polymerization degree and high polymerization degree, which can be used to modulate different oil products. This kind of base oil and mineral oil, no S, P and metal, because no wax, so very low pour point, usually at 40 DEG C, the viscosity index more than 140. But the boundary of PAO is poor in lubricity. In addition, because of its small polarity, poor ability to dissolve polar additives and shrinkage of rubber seals, these problems can be overcome by adding a certain amount of esters.Other synthetic oils (synthetic hydrocarbons, esters, silicone oils, etc.), vegetable oils, and recycled base oils, in addition to class I to IV base oils, are collectively referred to as class V base oils.
