Process for fluorinating end groups of perfluoropolyether acids

A technology of perfluoropolyether acid and perfluoropolyether, which is applied in the field of fluorine chemical synthesis, can solve the problems of low fluorination conversion rate and low utilization rate of fluorinating agent gas, and achieve less by-products, safe and stable reaction, and fluorine The effect of chemical reaction is sufficient
CN106397761BActive Publication Date: 2021-06-18TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
Publication Date
2021-06-18

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Abstract

The invention belongs to the field of fluorine chemical synthesis, and specifically relates to a method for fluorinating the end groups of perfluoropolyether acids, which uses perfluoropolyether acids and fluorinating agents as raw materials, and uses fluorine gas passivated fillers as fillers in the gas Synthesized in a liquid contact reaction tube, the filler is one or a mixture of carbon steel, stainless steel 304, and stainless steel 316. Perfluoropolyether acid or its solution is poured down on the top of the gas-liquid contact reaction tube from top to bottom, and the fluorinating agent gas is fully contacted with perfluoropolyether through the filling gap in the gas-liquid contact reaction tube from bottom to top. , to maximize the gas-liquid contact, thereby maximizing the utilization rate of the fluorinating agent, and realizing the full and complete fluorination reaction of perfluoropolyether. In addition, the method continuously fluorinates the perfluoropolyether, which solves the problem of one-pot-one-pot fluorination in the prior art, thereby simplifying the operation procedure. The method has few by-products of fluorinated perfluoropolyether, simple operation, continuous production, safe and stable reaction, and is suitable for large-scale industrial production applications.
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Description

technical field

[0001] The invention belongs to the field of fluorine chemical synthesis, and in particular relates to a method for fluorinating end groups of perfluoropolyether acids. Background technique

[0002] Perfluoropolyether and its grease are due to their excellent extreme high temperature resistance, wide operating temperature range, excellent oxidation resistance and chemical corrosion resistance, wide material compatibility, excellent electrical insulation properties, and excellent film-forming properties. , excellent load-carrying and lubricating properties, it is widely used in cutting-edge scientific fields such as military industry, aerospace and nuclear industry.

[0003] No matter the preparation of perfluoropolyether acid by anionic polymerization of hexafluoropropylene oxide represented by DuPont, or the preparation of perfluoropolyether acid by photooxidation method represented by Solvay, the end groups of the generated perfluoropolyether acid are all d...

Claims

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