Synthesis method of perfluoropolyether lubricant base oil

Abstract

Belonging to the field of perfluoropolyether lubricant synthesis, the invention discloses a synthesis method of perfluoropolyether lubricant base oil. The method is realized by the steps of: (1) synthesis of perfluoropolyether acyl fluoride; and (2) decarbonylation end capping for synthesis of perfluoropolyether oil. The method can endow the perfluoropolyether with a conversion rate up to 95% or above and a high average relative molecular mass, after end capping, perfluoropolyether oil with high stability, oxidation resistance and other properties can be obtained. According to the method, no diluent is added in the perfluoropolyether synthesis process, the process is relatively simple, and the cost is low. At the same time, precious transition metal halide salt or dangerous antimony pentafluoride are not used as the decarbonylation catalyst in the end capping reaction, instead a conventional nitrate is employed, and is low in cost, easy to recover, and suitable for industrial production. At the same time, compared with the conventional production process carried out at a temperature ranging from -30DEG to -60DEG C, the method is carried out at a temperature ranging from 0 to -30DEG C, under the circumstance of equal output, the production cost is significantly reduced.

Description

technical field [0001] The invention relates to a method for synthesizing perfluoropolyether lubricating oil base oil, and belongs to the field of perfluoropolyether lubricating oil synthesis. Background technique [0002] Perfluoropolyether is an important organic fluorine chemical product. Due to its excellent properties such as low surface energy, high thermodynamic stability, non-combustibility, high chemical inertness, and low friction coefficient, perfluoropolyether and its related products are widely used. Lubrication used in the fields of aerospace, electronics, machinery and nuclear industry has a great demand in the world. However, due to the complex synthesis process and harsh conditions of perfluoropolyether, the production process needs to be further improved to reduce production costs, increase yield, and synthesize perfluoropolyether products with different degrees of polymerization. [0003] Perfluoropolyether refers to a liquid polymer obtained by polymeriz...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a synthesis method of perfluoropolyether lubricating base oil, which solves the current method of synthesizing perfluoropolyether oil, which has diluents that are difficult to recycle and uses precious transition metals Halogen salts are used as decarbonylation catalysts with high cost, very low reaction temperature, high energy consumption, and high cost.