Device used for treating unstable terminal group of fluorine-containing polymer and a process for treating same

A polymer and stable technology, applied in the field of fluorine chemistry, can solve the problems of large equipment investment, high production cost, unstable demand, etc., and achieve the effect of increasing reaction rate, improving processing capacity, and eliminating unstable end groups

Active Publication Date: 2017-05-10
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the variety of fluorine chemical products on the market and the unstable demand, this single raw material fixed production process and equipment lead to large investment in equipment and high production costs.

Method used

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  • Device used for treating unstable terminal group of fluorine-containing polymer and a process for treating same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A device for treating unstable end groups of fluorine-containing polymers, including a fluorine-making electrolytic cell, a hydrogen fluoride refrigeration remover, a fluorine gas collection tank, a diaphragm compressor, a fluorine-nitrogen mixed gas high-pressure storage tank, and a high-pressure reaction tank; the gas outlet of the high-pressure reaction tank is also connected with another gas outlet pipeline of the fluorine gas collection tank; the gas outlet of the high-pressure reaction tank is also connected with an alkali washing tower for mixing the unreacted fluorine and nitrogen After the tank is washed, it is emptied; there is a vacuum buffer tank and a vacuum pump connected to the vacuum buffer tank between the high-pressure reaction tank and the alkali washing tower.

[0031] Wherein, a sampling port is provided on the top and bottom of the fluorine gas collection tank, which is used for gas chromatography to sample and analyze the fluorine-nitrogen mixture ...

Embodiment 2

[0034] The fluorination treatment of embodiment 2 polyfluoroethylene propylene (FEP)

[0035] A kind of fluorinated processing method of polyperfluoroethylene propylene (FEP), comprises the steps:

[0036] (1) Refining and collection of fluorine gas;

[0037] Evacuate the fluorine gas collection tank (fluorine-nitrogen mixed gas tank) and the fluorine-nitrogen mixed gas high-pressure tank for backup, start the fluorine-making electrolytic cell and gradually increase the current of the electrolytic cell, and after the anode chamber and its pipeline of the electrolytic cell are replaced with fluorine gas, the fluorine The gas is switched to the fluorine gas collection tank for collection until the pressure of the fluorine gas collection tank is equal to the atmospheric pressure, the fluorine gas is switched to vent the scrubber, the fluorine gas inlet valve of the fluorine gas collection tank is closed, and the fluorine electrolytic cell is stopped.

[0038] (2) Preparation and...

Embodiment 3

[0044] The fluorination treatment method of embodiment 3 polytetrafluoroethylene (PTFE)

[0045] A kind of fluorination treatment method of polytetrafluoroethylene (PTFE), comprises the steps:

[0046] (1) Refining and collection of fluorine gas;

[0047] Evacuate the fluorine gas collection tank (fluorine-nitrogen mixed gas tank) and the fluorine-nitrogen mixed gas high-pressure tank for backup, start the fluorine-making electrolytic cell and gradually increase the current of the electrolytic cell, and after the anode chamber and its pipeline of the electrolytic cell are replaced with fluorine gas, the fluorine The gas is switched to the fluorine gas collection tank for collection until the pressure of the fluorine gas collection tank is equal to the atmospheric pressure, the fluorine gas is switched to vent the scrubber, the fluorine gas inlet valve of the fluorine gas collection tank is closed, and the fluorine electrolytic cell is stopped.

[0048] (2) Preparation and pre...

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PUM

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Abstract

The invention relates to a device used for treating an unstable terminal group of a fluorine-containing polymer. The device comprises a fluorine-preparing electrolyzer, a hydrogen fluoride freezing remover, a fluorine gas collecting tank, a diaphragm compressor, a fluorine and nitrogen mixed gas high-pressure storage tank and a high-pressure reaction tank, wherein the gas outlet of the high-pressure reaction tank is connected with one gas outlet pipeline of the fluorine gas collecting tank. A process for treating the unstable terminal group of the fluorine-containing polymer concretely comprises the following steps: (1) refinement and collection of fluorine gas; (2) preparation and pressurization of fluorine and nitrogen mixed gas; and (3) fluorination of the unstable terminal group of the fluorine-containing polymer. The device and process for fluorination provided by the invention can realize fluorination directing at different fluorine-containing polymers (like polytetrafluoroethylene PTFE, fluorinated ethylene propylene FEP and a tetrafluoroethylene and heptafluoropropyl trifluorovinyl ether copolymer PFA), has extremely extensive applicability and good fluorination effects, and is applicable to great popularization in the fluorine chemical industry.

Description

technical field [0001] The invention relates to a device and a treatment process for treating unstable end groups of fluorine-containing polymers, and belongs to the technical field of fluorine chemistry. Background technique [0002] During the homopolymerization and copolymerization of fluoropolymers, due to the use of inorganic peroxides (such as potassium persulfate K 2 S 2 o 8 , ammonium persulfate (NH 4 ) 2 S 2 o 8 ) The initiator can produce a large number of carboxylic acid end groups in the chain initiation and termination stage, or the vinyl bond in the fluoropolymer molecular chain itself is oxidized into carboxylate, resulting in the fluoropolymer molecular chain with carboxylate Unstable terminal groups such as acid radicals. The peroxide initiator leads to the generation of fluoroacyl-COF, which is unstable in water and decomposes to generate -COOH and hydrofluoric acid. At fluoropolymer processing temperatures, -COOH decomposes to CO 2 And -CF=CF-, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/26C08F214/26C08F8/22
Inventor 庹洪张廷建
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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