Synthesis And Application Of Ashless Dispersants Of Boronated Polyisobutylene Succinimides

With the development of science and technology, lubricant requirements for all kinds of machinery and equipments are getting higher and higher, which means oil can no longer meet the requirements of the machinery, so it is necessary to add some compounds with a variety of performance. These types of compound to be added may not exist in large quantity in the lubricant, but can improve its quality, and we call such substances "industrial MSG".The ashless dispersant is one of the main additives for lubricating oil.The main work of this article is focus on the ashless dispersant boron modified, and then after the boron-modified dispersant lubricant modulation and mechanical properties test.Therefore, improvements on existing ashless dispersants and development process, taking into account the the boron element having a non-toxic, anti-corrosion, anti-wear, and fire-retardant characteristics, so the introduction of such elements to the dispersant. After introduced the boron element into the ashless dispersants under the premise does not change its dispersion performance, abrasion resistance and thermal stability are improved obviously.The subject in the boron-modified ashless dispersant made the following main points:1.Direct boride process is usually used in the conventional borated process, but it use solid acid agent. Thus, the product is unstable, easily precipitate solid boron. This paper also use directly diboride technology, but as solvent. After a long time trial, the diboride products synthesized from the mixed solvent diboride is stable, transparent and have no solid boron precipitation, which successfully overcomes the insufficiencies of direct boride.2.After that, this paper uses liquid-glycerol boric acid ester and tri-n-butyl borate as boron source to synthesis boron-containing cross-polyisobutylene succinimide ashless dispersant, and then characterize it by infrared spectroscopy, thermal gravimetric analysis, NMR and ICP-AES. The characterization results show that:the ashless dispersant with boric acid esters as boron source for the synthesis has good dispersion properties and thermal stability, as well as good anti-wear properties. These results show that this additive has the combined effect of anti-wear additives and detergent dispersant, and its thermal stability is far superior to the boron source diboride ashless dispersant synthesized of boric acid. If applied successfully, it can greatly reduce the kinds and amounts of additives in lubricating oil, improving the quality of the lubricating oil.3. After we uccessfully conducted on polyisobutylene succinimide modification of diboride, the prepared boron-modified ashless dispersant to prepare a lubricating oil and then test the mechanical properties, the boron content of the borated product obtained up to4%. Wherein pure dispersion and the thermal oxidation performance is superior to similar domestic products, the effect is better than unboronated product, in line with the expectations.