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

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...

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.

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