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Engine Oil Additive High Temperature Lubricity
Oct 20, 2017

engine oil additive High temperature lubricity

Thickener, also known as viscosity index improver, is an oil-soluble polymer compounds, at room temperature is generally rubber or solid state. For ease of use, usually with 150SN or 100SN neutral oil diluted to 5% to 10% of the concentrate. In the lower viscosity of the base oil to add 1% to 10% of the tackifier, not only can increase the viscosity of oil to improve the viscosity of the oil performance, so that the oil has good high temperature lubrication and low temperature fluidity, and Can reduce the consumption of fuel and lubricants, to achieve universal oil. Texaco and Exxon are still working on the development of dispersion-type OCP and styrene-butadiene copolymers in addition to past dispersed polymethacrylates, Improve the storage stability of distributed OCP, low temperature performance, shear stability, dispersion and so on. RohmTech offers a methacrylate-based engine oil viscosity index improver that facilitates the protection of fluororubber seals. In 1993, Lubrizol company has introduced a both for the engine oil, but also for the transmission system oil and hydraulic oil viscosity index improver products. Shell Chemical uses its experience in the polymer to produce viscosity index improvers. In addition, in order to meet the needs of energy conservation, Japan Sanyo Chemical Company developed a high viscosity index (115 ~ 150) base oil viscosity index improver, can give very low temperature viscosity to meet the drive system and hydraulic oil Low temperature viscosity requirements. Foreign multi-functional viscosity index improver developed rapidly, patent reports a lot, for example, through random copolymerization, graft copolymerization, grafting and other methods to introduce dispersed, antioxidant, anti-wear groups, become a decentralized, anti- Oxygen and corrosion resistance of the multi-effect additives. At present, the most commonly used viscosity index improvers abroad are hydrogenated - styrene - diene polymers (such as hydrogenated - styrene - butadiene polymer HSB, hydrogenated - styrene - isoprene polymer HIS, Hydrogenated isoprene HI), polymethacrylate (PMA), polyisobutylene (PIB), ethylene propylene copolymer (OPC or EPC), and the like. The main types of viscosity index improvers in the country are polyvinyl n-butyl ether, polymethacrylate, polyisobutylene, ethylene propylene copolymer, polyacrylate and the like.

The solidification of the pour point depressant oil is often caused by the crystallization of the wax. In order to obtain a low pour point lubricating oil, two methods are usually used: one is the deep dewaxing, but these reduce the yield of the base oil, Processing costs, it may be some of the performance of oil deterioration; the second is to use pour point depressant to reduce the oil solidification temperature. A pour point depressant is a chemically synthesized polymer or condensate which typically contains a polar group (or aromatic nucleus) and an alkyl chain similar to the paraffinic hydrocarbon structure in its molecule. The pour point depressant can not prevent the paraffin from crystallizing at low temperature, that is, the cloud point of the oil is unchanged, it is through the wax crystal surface adsorption or wax eutectic to change the wax crystal shape and size, to prevent the formation of three-dimensional wax Structure, so that it still keeps the oil flowing at low temperatures. However, the pour point depressant only in a small amount of wax in order to play the role of oil from the oil does not contain wax or wax too much no pouring effect.

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