Fluoropolyester type detergent, preparation method and prepared lubricating oil composition

Abstract

The invention belongs to the technical field of synthesis of lubricating oil detergents, in particular relates to a fluoro-polyester type detergent and further discloses a preparation method of the fluoro-polyester type detergent and a lubricating oil composition prepared from the fluoro-polyester type detergent. According to the fluoro-polyester type detergent provided by the invention, a main organic raw material adopts a fluoro-compound, and the high-temperature-resisting performance and carbon-deposition-resisting performance of a final product are ensured; meanwhile, polyester has relatively great molecular weight, more carboxyl groups and a strong dispersion capability, and a detergent product with high alkali value (380 to 420mgKOH / g), a low pour point, good high-temperature-resisting performance and more stable performance can be obtained; fluoro-polycarboxylic polyester salt with relatively great molecular weight can form an adsorption film on a metal surface of an engine better so that good high-temperature cleaning performance is provided and the comprehensive application performance is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lubricating oil detergent synthesis, specifically relates to a fluorinated polyester type detergent, and further discloses a preparation method thereof and a lubricating oil composition prepared by the same. Background technique [0002] Lubricating oil is a liquid or semi-solid lubricant used in various types of automobiles and mechanical equipment to reduce friction and protect machinery and processed parts. It mainly plays the roles of lubrication, cooling, rust prevention, cleaning, sealing and buffering. However, during the use of engine lubricating oil, due to factors such as harsh operating conditions, high-temperature oxidation, and the inhalation of nitrogen oxides and sulfur dioxide acid gases from the outside, the lubricating oil is prone to oxidative degradation and a certain amount of acid corrosion. Substances, such as sulfuric acid, nitric acid, acid sludge, etc., will reduce the lubricatin...

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Problems solved by technology

On the one hand, these mineral base oils are products of petroleum refining, which not only have poor degradability but also contain certain waxes, and are not suitable for high-end lubricating oils that have high requirements for environmental protection and pour point; on the other hand , these straight-chain organic acid raw materials selected have small molecules and relatively single carboxyl groups, resulting in poor dispersion performance. The base value of the prepared detergent product is mostly around 300mgKOH / g, which cannot be obtained stably. Detergent products with required high alkali value (380-420mgKOH / g); moreover, because the organic acid raw material adopted is a linear structure, it will cause poor dispersibility to alkaline components such as colloidal calcium carbonate and magnesium carbonate Stable, so that colloidal carbonate is easy to precipitate under high temperature conditions, reducing its cleaning and dispersing ability; and because the organic acid salt molecules formed are too small, a stable adsorption film cannot be formed on the metal surface, which also leads to the cleaning of the engine Insufficient protection ability; especially the organic acid and diluent oil in the raw materials are compounds with ordinary carbon chains, which have poor high temperature resistance, are easy to degrade under high temperature, and are more likely to generate carbon deposits, which affect their performance

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