A kind of lubricating oil ashless dispersant and preparation method thereof

Abstract

The invention relates to an ashless dispersant for lubricating oil, which has a structure represented by formula (I) or (II). The invention also relates to a method for preparing an ashless dispersant for lubricating oil, which includes the following steps: (1) First, add hydrocarbyl-substituted succinic anhydride and base oil into a reactor, raise the temperature to 70-90°C, stir evenly, and add carboxyl-containing and hydroxyl compounds, react continuously at 130-150°C for 5-8 hours, and then remove water at 140-160°C for 2-4 hours to obtain intermediate product A; (2) Add the intermediate product A into the reactor and raise the temperature to 95-110°C, add polyethylene polyamine compounds and polyether amine compounds at the same time, react at 115-125°C for 2-3 hours, then raise the temperature to 150-160°C to remove water for 5-8 hours, and cool to obtain ash-free Powder B.

Description

Technical field [0001] The invention belongs to the field of lubricating oil additives and relates to an ashless dispersant and a preparation method thereof. Background technique [0002] The emergence of ashless dispersants is inseparable from the development of the modern automobile industry. With the development of the automobile industry in the 1940s and 1950s, the number of automobiles increased dramatically, causing urban traffic jams and serious air pollution. In order to reduce air pollution, positive pressure intake and exhaust (PCV) systems are commonly used, which can easily cause the decomposition products of fuel oil (peroxides, hydroperoxides and free radicals) to leak into the crankcase and cause the lubricating oil to leak. The oxidation will eventually be deposited on the piston surface, causing the lubrication effect to decrease. In the early 1960s, the United States developed various types of non-polymeric succinimide ashless dispersants, which solved the...

AI Technical Summary

Problems solved by technology

Polyether amine compounds alone are used as dispersants, because of their low nitrogen content and base value, their dispersing effect is far inferior to that of polyisobutylene succinimide dispersants, and cannot effectively prevent large particle deposits such as soot. In literature and patents, polyetheramine compounds are usually mixed with polyisobutylene succinimide dispersants, boronized ashless dispersants, etc., but simple mixing and compounding does not achieve the function of ashless dispersants structurally requirements

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