• Follow us
Home > News > Content
Ashless Dispersant Classification And Development Trend Of Ashless Dispersant
Jul 04, 2017

ashless dispersant Classification and Development Trend of Ashless Dispersant

Summary: Order a copy of this thesis The ashless 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 modern automotive industry is closely related to the development. 40,50 years, due to the increase in foreign cars, especially the sharp increase in the US car, making 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 internal combustion engine oil put forward higher requirements. Traffic congestion makes cars in the city often at low speed and shut down open, in which 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 paint film, sludge sedimentation trend increased. And the resulting large number of water vapor is condensed 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, ganglia, no ash phosphate, etc., in recent years has also developed a high molecular weight ashless dispersant, boron Non-ash dispersant and other varieties. 2.1 polyisobutylene butanediimide-type ash-free dispersant polyisobutylene butanediol imine is a widely used and the most used a dispersant, the world's major additive companies have regular products. Can be divided into three categories, namely, monobutyl isobutylene dodecthalimide, bis-isobutylene butanediimide, polyisobutylene butanediimide.

Isobutylene dodecthalimide is a molecular weight of about 1000 polyisobutylene and maleic anhydride reaction of polyisobutylene maleic anhydride (PIBSA), and then with different anhydride ratio of polyene polyamine reaction of single, double and more Polyisobutylene butanediimide. The low-temperature dispersibility of monobutyl isobutylene butanediimide is 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 1960s began trial production of polyisobutylene butanediimide imide dispersant, in the early 80s in Lanzhou Refining and Chemical Plant for industrial production, the current annual production capacity of l million t, has been widely used in internal combustion engine oil. In the mid-1980s Jinzhou Petrochemical Company refinery from the United States Lubrizol company introduced a set of annual production capacity of 10,000 tons of polyisobutylene butanediamine disperse production technology and devices, is now officially produced. 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. 2.2 polyisobutylene succinic acid polyisobutylene succinate is about 1000 molecular weight of polyisobutylene and maleic anhydride reaction of polyisobutylene succinic anhydride, and then with the polyol reaction, it is the 1970s developed a new ash-free Powder. Such as pentaerythritol obtained by the reaction of ash-free dispersant can be used in gasoline engine oil and diesel engine oil, most of the same with the use of dipal Phthalimide. At present, only Lubrizol abroad have this product (LZ936), China's product code for the LAM56, produced by the Lanzhou Refining and Chemical Plant.