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Ashless Dispersant Development Trend
Jun 06, 2017

Classification and Development Trend of Non - ash Dispersant

Summary: Order a copy of this thesis No ash dispersant is the main additive of lubricating oil and fuel oil. There are many kinds of additives, mainly polyisobutylene butanediimide, polyisobutylene succinic acid, polyisobutylene succinic acid Vinegar, heptamine, ash-free phosphate, high molecular weight ashless dispersant and boron modified ashless dispersant. In this paper, the above-mentioned several ashless dispersants and their major manufacturers at home and abroad are also pointed out. With the increasing demands of engine work and environmental regulations, high viscosity index dispersants become the research trend. In addition, Good dispersion at the same time, also need a good antioxidant, anti-wear and rubber compatibility. Key words ashless dispersant lubricants fuel oil additives ashless dispersant development and the development of modern automobile industry are closely related. 40 a 50 years, due to the increase in foreign cars, especially the rapid increase in US cars, making the increase in environmental pollution and urban traffic congestion. In order to reduce air pollution, the use of positive pressure into the exhaust (PCv) system, which makes acidic substances into the tank, so the performance of the internal combustion engine oil put forward higher requirements. Traffic congestion makes cars traveling in cities often at low speed and shut down, and in this case the temperature of the car crankcase oil is reduced so that fuel hydrocarbons and moisture (moisture) are not easily discharged from the lubricating oil , So that the film, sludge sedimentation trend increased. And a large number of water vapor generated by condensation is generated to produce a large number of emulsified sludge, resulting in blocking the pipeline and filter, seriously affecting the normal use of crankcase oil. Because of the above reasons, from the 60's, lubricants and fuel oil are used ashless dispersant, to solve the sludge problem, thus ensuring the normal operation of the car. 1 ashless dispersant type ashless dispersant many types, mainly polyisobutylene butanediimide, polyisobutylene succinic acid cool, amine, ash-free phosphoric acid vinegar, in recent years has also developed a high molecular weight ashless dispersant, boron No ash dispersant and other varieties. 2.1 polyisobutylene butanediimide-type ash-free dispersant polyisobutylene butanediol imine is a widely used and the largest amount of a dispersant, the world's major additive companies have regular products. Basic can be divided into three categories, namely, monobutyl isobutylene dodecthalimide, bis-isobutylene butanediimide, polyisobutylene butanediimide.

Polyisobutylene butanediimide is a polyisobutylene with molecular weight of about 1000 and maleic anhydride to produce polyisobutylene maleic anhydride (PIBSA), and then with different anhydride ratio of polyene polyamine reaction of single, double and Polyisobutylene butanediimide. The low-temperature dispersion properties of monobutyl isobutylene butanediimide are particularly good for gasoline engine oil; double and polyisobutylene butanediol imines have good thermal stability and are more used in supercharged diesel oil. China from the late 60s began trial production of polyisobutylene butanediimide imide, the current annual production capacity of l million t, has been widely used in internal combustion engine oil. It can be said that the development of the domestic dispersant soon, in 1982 began production, when the output of 60t, accounting for about 1% of the total amount of additives; and until 1989, the dispersant dose of about 20% of the total amount of additives, Species has undergone a fundamental change.