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Post-treatment method of ethylene/tetrafluoroethylene copolymer slurry

A technology of tetrafluoroethylene and copolymers, which is applied in the field of post-processing of ethylene-tetrafluoroethylene copolymers, and can solve problems such as consumption, time-consuming, and excessive energy

Active Publication Date: 2016-08-17
SHANGHAI 3F NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (ii) In the solution method, the solid content of the ethylene-tetrafluoroethylene copolymer in the slurry is low, generally less than 10%, and it is directly mixed with water, heated, and the solvent is removed, which consumes more energy and is time-consuming;

Method used

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  • Post-treatment method of ethylene/tetrafluoroethylene copolymer slurry
  • Post-treatment method of ethylene/tetrafluoroethylene copolymer slurry
  • Post-treatment method of ethylene/tetrafluoroethylene copolymer slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Add 300kg of trichlorotrifluoroethane, 200g of perfluorobutylethylene and 200ml of cyclohexane into a 500L stainless steel autoclave that has undergone oxygen removal treatment, raise the temperature to 40°C while stirring, and add tetrafluoroethylene / ethylene=75 / 25 (mol%) mixed gas to a pressure of 0.8MPa, add 100ml concentration of 0.25mol / L (C 3 f 7 OC 2 f 4 CO 2 ) 2 trichlorotrifluoroethane solution to start polymerization. During the polymerization, the mixed gas of tetrafluoroethylene / ethylene (mol%)=55 / 45 was added continuously, and 200g of perfluorobutylethylene and 50ml of the above-mentioned initiator solution were added every 30min. After 3 hours, the polymerization reaction was terminated and the reactor was immediately emptied so that the pressure was 0 MPa. The solid content of the slurry was 9 wt%.

[0062] Then, with the help of gravity, the ethylene-tetrafluoroethylene copolymer slurry in the autoclave is transported to a 500L filter-washing-dry...

Embodiment 2

[0066] Add 300kg of trichlorotrifluoroethane, 200g of perfluorobutylethylene and 100ml of cyclohexane into a 500L stainless steel autoclave that has undergone oxygen removal treatment, raise the temperature to 40°C while stirring, and add tetrafluoroethylene / ethylene=75 / 25 (mol%) mixed gas to a pressure of 0.8MPa, add 100ml concentration of 0.25mol / L (C 3 f 7 OC 2 f 4 CO 2 ) 2 trichlorotrifluoroethane solution to start polymerization. During the polymerization, the mixed gas of tetrafluoroethylene / ethylene (mol%)=55 / 45 was added continuously, and 200g of perfluorobutylethylene and 50ml of the above-mentioned initiator solution were added every 30min. After 3 hours, the polymerization reaction was terminated and the reactor was immediately emptied so that the pressure was 0 MPa. The solid content of the slurry was 9 wt%.

[0067] Then, with the help of gravity, the ethylene-tetrafluoroethylene copolymer slurry in the autoclave is transported to a 500L filter-washing-dry...

Embodiment 3

[0070] Add 300kg of trichlorotrifluoroethane, 250g of perfluorohexylethylene and 200ml of cyclohexane into a 500L stainless steel autoclave that has undergone oxygen removal treatment, raise the temperature to 40°C while stirring, and add tetrafluoroethylene / ethylene=75 / 25 (mol%) mixed gas to a pressure of 0.8MPa, add 100ml of concentration of 0.25mol / L (C 3 f 7 OC 2 f 4 CO2 ) 2 trichlorotrifluoroethane solution to start polymerization. During the polymerization, the mixed gas of tetrafluoroethylene / ethylene (mol%)=55 / 45 was continuously added, and 200g of perfluorohexylethylene and 50ml of the above-mentioned initiator solution were added every 30min. After 3 hours, the polymerization reaction was terminated and the reactor was immediately emptied so that the pressure was 0 MPa. The solid content of the slurry was 9 wt%.

[0071] Then, with the help of gravity, the ethylene-tetrafluoroethylene copolymer slurry in the autoclave is transported to a 500L filter-washing-dr...

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Abstract

Disclosed is a post-treatment method for ethylene / tetrafluoroethylene copolymer slurry, which includes the following steps: (i) providing ethylene-tetrafluoroethylene copolymer slurry; (ii) filtering with 0.2-2 liters / kg filter cake Add water to the filter cake, stir at 10-110°C at a speed of 10-300rpm for 1-120 minutes; (iii) form ethylene-tetrafluoroethylene copolymer particles after drying.

Description

technical field [0001] The invention relates to an improved post-treatment method of ethylene-tetrafluoroethylene copolymer. The ethylene-tetrafluoroethylene copolymer treated by the method of the invention has the advantages of good particle roundness, uniform particle size distribution and high fluidity . Background technique [0002] Ethylene-tetrafluoroethylene copolymer (ETFE) is a fusible fluoropolymer that can be produced by suspension, emulsion or solution-precipitation polymerization. It has excellent electrical properties, chemical resistance and aging resistance, and Due to the introduction of ethylene, ethylene-tetrafluoroethylene copolymer has excellent radiation resistance and its density is very low. Furthermore, due to the modification of the third monomer, its mechanical properties (wear resistance, crack resistance and impact strength, etc.) have been greatly improved, and it is often used in some special fields, such as aerospace wire and cable and Films...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/26C08F210/02C08F6/00
Inventor 杜丽君沈骥昉吴君毅
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD