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Method for preparing polyperfluorinated ethylene propylene resin

A technology of polyperfluoroethylene propylene and tetrafluoroethylene, which is applied in the field of chemical industry, can solve problems such as the change in the proportion of mixed monomers and the uneven distribution of polymerization product components, and achieve the effect of reducing the feeding time

Active Publication Date: 2012-05-09
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

[0008] Adding only one monomer tetrafluoroethylene (TFE) during the polymerization process will lead to changes in the proportion of mixed monomers in the reactor, resulting in uneven distribution of the components of the polymerization product

Method used

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  • Method for preparing polyperfluorinated ethylene propylene resin
  • Method for preparing polyperfluorinated ethylene propylene resin

Examples

Experimental program
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Effect test

Embodiment 1

[0053] The batch radical emulsion preparation of the present invention is carried out in a 50L autoclave to prepare polyperfluoroethylene propylene resin. Add 30L of deionized water into the reaction kettle, heat up and boil, and keep the temperature constant for 80min. Then the air in the vapor space of the reactor was first replaced with nitrogen to an oxygen content of 20 ppm. Add 60g of 5wt% ammonium perfluorooctanoate aqueous solution into the reactor through a metering pump, and raise the temperature of the reactor to 85°C. 4.5Kg of initial mixed monomers (0.9Kg tetrafluoroethylene; 3.6Kg hexafluoropropylene) were added within 5min.

[0054] Start stirring, fully mix the mixed monomers in the reactor, then add 30g of 5wt% potassium persulfate solution to start the reaction. During the reaction, additional mixed monomers (tetrafluoroethylene:hexafluoropropylene=15:1 (molar ratio)) were used to maintain the pressure of the reactor at 3.5 MPa, and the reaction temperature...

Embodiment 2

[0056] The batch radical emulsion preparation of the present invention is carried out in a 50L autoclave to prepare polyperfluoroethylene propylene resin. Add 40L of deionized water into the reaction kettle, heat up and boil, and keep the temperature constant for 80min. Then the air in the vapor space of the reactor was first replaced with nitrogen to an oxygen content of 30 ppm. Add 11.4KG 7wt% potassium perfluorooctanoate aqueous solution into the reaction kettle through a metering pump, and raise the temperature of the reaction kettle to 110°C. 20Kg of initial mixed monomers (2.34Kg tetrafluoroethylene; 17.66Kg hexafluoropropylene) were added within 15min.

[0057] Turn on the stirring, fully mix the mixed monomers in the reactor, then add 1.2Kg of peroxysuccinic acid to start the reaction. During the reaction, additional mixed monomers (tetrafluoroethylene:hexafluoropropylene=19:5 (molar ratio)) were used to maintain the pressure of the reactor at 5.5 MPa, and the reacti...

Embodiment 3

[0059] The batch radical emulsion preparation of the present invention is carried out in a 50L autoclave to prepare polyperfluoroethylene propylene resin. Add 30L of deionized water into the reaction kettle, heat up and boil, and keep the temperature constant for 80min. Then the air in the vapor space of the reactor was first replaced with nitrogen to an oxygen content of 20 ppm. Add 60g of 5wt% ammonium perfluorooctanoate aqueous solution into the reactor through a metering pump, and raise the temperature of the reactor to 85°C. Add 6Kg of initial mixed monomers (3Kg tetrafluoroethylene; 3Kg hexafluoropropylene) within 5min.

[0060] Start stirring, fully mix the mixed monomers in the reactor, then add 30g of 5wt% potassium persulfate solution to start the reaction. During the reaction, additional mixed monomers (tetrafluoroethylene:hexafluoropropylene=3:1 (molar ratio)) were used to maintain the pressure of the reactor at 3.5 MPa, and the reaction temperature was 85°C. Af...

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Abstract

The invention relates to a method for preparing a polyperfluorinated ethylene propylene resin, comprising the following steps of: (1) adding deionized water to a reaction kettle and preserving 30-50% of space; (2) charging nitrogen and boiling the deionized water; (3) adding an emulsifier to the reaction kettle, stirring uniformly, adding an initially mixed monomer of tetrafluoroethylene and hexafluoropropylene and thereafter adding an initiator to react; (4) compensating the mixed monomer of the tetrafluoroethylene and the hexafluoropropylene additionally during the reaction and maintaining the reaction kettle at constant pressure; and (5) obtaining the polyperfluorinated ethylene propylene resin after the reaction. The method for preparing the polyperfluorinated ethylene propylene has fast reaction and low cost; the high temperature molten extrudate of the polyperfluorinated ethylene propylene resin in the product has good colour, excellent thermal stress resistance and good processability.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a preparation method of polyperfluoroethylene propylene resin. Background technique [0002] Polyfluoroethylene propylene, also known as fluoroplastic 46 (F46, FEP), is a copolymer of tetrafluoroethylene and hexafluoropropylene. [0003] [0004] Polyfluoroethylene propylene resin has all the excellent properties of polytetrafluoroethylene resin. It can be used in a wide temperature range (-200 ° C ~ 200 ° C). It can be processed and formed by ordinary thermoplastic technology. It is suitable for transfer molding into pumps, valves, and chemical equipment. Lining; molded into sheets, valve diaphragms, sealing parts; extruded pipes, films, wires, cables, etc. It is an indispensable new engineering material for national defense, chemical industry, electrical, textile and other departments. [0005] Polyfluorinated ethylene propylene was first promoted by DuPont of the United S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/26C08F214/28C08F2/24
Inventor 兰军张建新李斌余金龙赵少春高家勇王先荣白鲸
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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