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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

Active Publication Date: 2021-06-18
TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of batch synthesis in the prior art, low utilization rate of fluorinating agent gas, and low fluorination conversion rate, and provide a method for fluorinating perfluoropolyether

Method used

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  • Process for fluorinating end groups of perfluoropolyether acids
  • Process for fluorinating end groups of perfluoropolyether acids

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Embodiment 1

[0021] Fill the gas-liquid contact reaction tube with an inner diameter of 15 cm and a height of 200 cm with fillers passivated by fluorine gas with a particle size of 3 mm. The fillers in this example are carbon steel, and the temperature is controlled at 60 ° C to carry out the reaction of fluorinated perfluoropolyether acids , taking fluorine nitrogen gas with a fluorine gas content of 20% as the fluorinating agent. Hexafluorobenzene is used as a solvent, and a perfluoropolyether acid solution with a mass concentration of 50% and a weight average molecular weight of 8000 g / mol is used as a reaction solution. The fluorination experiment was carried out by controlling the mole of fluorine gas in fluorine nitrogen to be 20:1 of perfluoropolyether. Blow the fluorinating agent into the air inlet at the reaction bottom of the catalytic tube at a speed of 2L / min, and the product perfluoropolyether content collected in the product collection bottle at the lower end of the reaction ...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/323C08G65/326C08G65/328
CPCC08G65/3236C08G65/326C08G65/328
Inventor 肖鑫贺光瑞赵兴华耿谦张志君
Owner TIANJIN CHANGLU CHEM NEW MATERIAL CO LTD
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