Method for preparing polyperfluorinated ethylene propylene from perfluorodiacyl peroxide initiator

A technology of perfluoroacyl peroxide and polyperfluoroethylene propylene is applied in the field of fluorine chemical industry to achieve the effect of reducing equipment investment, reducing production cost, good stability and weather resistance

Inactive Publication Date: 2012-09-19
江苏梅兰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the defects in the background technology, the present invention provides a method for preparing polyperfluoroethylene propylene with an organic peroxide initiator for perfluoroacyl peroxides, which does not require term

Method used

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  • Method for preparing polyperfluorinated ethylene propylene from perfluorodiacyl peroxide initiator
  • Method for preparing polyperfluorinated ethylene propylene from perfluorodiacyl peroxide initiator

Examples

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Example Embodiment

[0019] Example 1

[0020] After replacing the 2L reactor with nitrogen and evacuating, add 800 g of deionized water to the reactor, and then pass 400 g of excess perfluoropropylene monomer into the reactor; increase the temperature of the reactor to make the temperature in the reactor reach 10°C , Directly add 0.1g perfluorobutyryl peroxide into the reaction kettle; then pass in tetrafluoroethylene monomer to make the pressure in the kettle reach 1.40MPa, and then start stirring for the reaction; during the reaction process, continuously feed the reaction kettle The tetrafluoroethylene monomer is introduced into the reactor, and the pressure in the reactor is maintained at 1.30MPa by adjusting the size of the feed valve switch of the reactor; after 7 hours of reaction, the reaction is terminated, the material is discharged, and the prepared copolymer is heated in a thermostat to Remove residual initiator.

Example Embodiment

[0021] Example 2

[0022] After replacing the 2L reactor with nitrogen and evacuating, add 800 g of deionized water to the reactor, and then pass 400 g of excess perfluoropropylene monomer into the reactor; increase the temperature of the reactor to make the temperature in the reactor reach 25°C , Directly add 0.3g of perfluoro(3,6-dioxaoctanoyl) peroxide to the reaction kettle; then pass in tetrafluoroethylene monomer to make the pressure in the kettle reach 1.10MPa, and then start stirring for the reaction; During the reaction process, tetrafluoroethylene monomer was continuously fed into the reactor, and the pressure in the reactor was maintained at 1.10MPa by adjusting the size of the feed valve switch of the reactor; after 5 hours of reaction, the reaction was completed, the material was discharged, and the preparation The copolymer is heated in a thermostat to remove residual initiator.

Example Embodiment

[0023] Example 3

[0024] After replacing the 2L reactor with nitrogen and evacuating, add 800g of deionized water to the reactor, and then pass 400g of excess perfluoropropylene monomer into the reactor; increase the temperature of the reactor to bring the temperature in the reactor to 40℃ , Directly add 0.5g of perfluoro(2-methyl-3-oxahexanoyl) peroxide into the reaction kettle; then pass in tetrafluoroethylene monomer to make the pressure in the kettle reach 0.80MPa, then start stirring to react During the reaction process, tetrafluoroethylene monomer is continuously fed into the reactor, and the pressure in the reactor is maintained at 0.80MPa by adjusting the size of the feed valve switch of the reactor; after 3 hours of reaction, the reaction is terminated and the material is discharged. The prepared copolymer is heated in a thermostat to remove residual initiator.

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Abstract

The invention provides a method for preparing polyperfluorinated ethylene propylene from a perfluorodiacyl peroxide initiator, belonging to the technical field of fluorine chemical industry. The method is characterized by comprising the following steps: displacing with nitrogen gas to vacuumize a reaction kettle; adding de-ionized water, then introducing excessive perfluorinated propylene monomers, and raising the temperature to 0-60 DEG C; then directly adding a perfluorodiacyl peroxide initiator, and introducing tetrafluoroethylene monomers; after the inside of the kettle reaches 0.5-1.5 MPa, stirring, and continuously introducing tetrafluoroethylene monomers into the reaction kettle; after the reaction pressure is maintained for 2-8 hours, discharging to obtain a polyperfluorinated ethylene propylene copolymer; and finally heating in a constant-temperature cabinet to remove the residual perfluorodiacyl peroxide. The terminal group of the prepared polyperfluorinated ethylene propylene is stable perfluorodiacyl, thereby having no need for the processing stage of end group stabilization later, simplifying the process flow, reducing the equipment investment, lowering the production cost and improving the production efficiency. Besides, the whole polymerization system is a solvent-free system, thereby having no problems of solvent recovery, pollution of solvent to the environment and the like.

Description

technical field [0001] The invention belongs to the technical field of fluorine chemical industry, and relates to a preparation method of polyperfluoroethylene propylene, in particular to a method for preparing polyfluoroethylene propylene with a perfluoroacyl peroxide initiator. The polymerization system of the method is a solvent-free system. It meets the requirements of environmental protection, and there are no problems such as solvent recovery and solvent pollution to the environment. Background technique [0002] Polyfluoroethylene propylene copolymer (FEP for short) is a copolymer of tetrafluoroethylene and perfluoropropylene. Like polytetrafluoroethylene, it is also a fully fluorinated structure. The difference is that part of the fluorine in the polytetrafluoroethylene main chain Atoms are replaced by trifluoromethyl. FEP has excellent heat resistance, low friction, non-stickiness, lubricity, chemical corrosion resistance, thermal stability, electrical insulation a...

Claims

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Application Information

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IPC IPC(8): C08F214/18C08F214/26C08F4/34
Inventor 徐荣归钱厚琴殷铭刘红阳
Owner 江苏梅兰化工有限公司
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