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A kind of ethylene-tetrafluoroethylene copolymer and preparation method thereof

A tetrafluoroethylene and copolymer technology, applied in the field of polymer synthesis, can solve the problems of not improving material processing and using thermal stability, and achieve the effects of facilitating mass production, reducing branching reactions, and improving thermal stability

Active Publication Date: 2020-11-03
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

[0005] Patent CN105294915A reports the ethylene-tetrafluoroethylene copolymer prepared by using perfluoroalkyl vinyl ether and perfluoro C2-12 alkylethylene. Although the transparency of ETFE is improved, the processing and thermal stability of the material are not improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The present embodiment relates to the preparation method of ethylene-polytetrafluoroethylene copolymer, comprises the steps:

[0046] 1) Add 5kg of deionized water and 25kg of tert-butanol in a 50L reactor. The reactor should be replaced. When the oxygen content is ≤30ppm, add 35g of perfluorooctanoate and heat the contents of the reactor to 50°C. Raise the reactor pressure to 3.5MPa with the initial mixed monomer ethylene and tetrafluoroethylene ratio: 70:30 (molar ratio). Add 15g potassium persulfate, 7g sodium metabisulfite and 25g diethyl malonate to start reaction;

[0047] 2) After the polymerization reaction is carried out, the absolute pressure in the reactor is maintained between 3.5±0.02MPa by adding additional mixed monomers, and the ratio of added mixed monomers ethylene and tetrafluoroethylene is: 55:45 (molar ratio) , the solid content of the emulsion reaches about 25% (mass percentage), and the polymerization reaction is terminated;

[0048] 3) Recover...

Embodiment 2

[0053] The present embodiment relates to the preparation method of ethylene-polytetrafluoroethylene copolymer, comprises the steps:

[0054] 1) Add 12kg of deionized water and 30kg of tert-butanol in a 50L reactor. The reactor should be replaced. When the oxygen content is ≤30ppm, add 30g of ammonium perfluorooctanoate and heat the contents of the reactor to 48°C. Raise the reactor pressure to 3.2MPa with the initial mixed monomer ethylene and tetrafluoroethylene ratio of 57:43 (molar ratio). Add 16g potassium permanganate, 9g sodium metabisulfite and 24g diethyl malonate to start reaction;

[0055] 2) After the polymerization reaction is carried out, the absolute pressure in the reactor is maintained between 3.2±0.02MPa by adding additional mixed monomers, and the ratio of added mixed monomers ethylene and tetrafluoroethylene is: 46:54 (molar ratio) , the solid content of the emulsion reaches about 26% (mass percentage), and the polymerization reaction is terminated;

[00...

Embodiment 3

[0059] The present embodiment relates to the preparation method of ethylene-polytetrafluoroethylene copolymer, comprises the steps:

[0060] 1) Carry out the emulsion polymerization of the present invention in a 50L reactor. Add 8kg of deionized water and 27kg of tert-butanol into the reactor. The reactor should be replaced. When the oxygen content is ≤30ppm, add 33g of perfluorooctanoate and heat the contents of the reactor to 50°C. Raise the reactor pressure to 3.8MPa with the initial mixed monomer ethylene and tetrafluoroethylene ratio: 72:28 (molar ratio). Add permanganate 20g, potassium bisulfite g10 and 12g diethyl malonate to start reaction;

[0061] 2) After the polymerization reaction is carried out, the absolute pressure in the reactor is maintained between 3.8±0.02MPa by adding additional mixed monomers, and the ratio of added mixed monomers ethylene and tetrafluoroethylene is: 47:53 (molar ratio) , the solid content of the emulsion reaches about 28% (mass percen...

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Abstract

The invention relates to a preparation method of an ethylene-tetrafluoroethene copolymer. The main improvement of the invention is that a polymerization reaction is carried out under the action of a redox mixing initiator by using a mixes solution of water and an organic solvent as a reaction medium in a process of preparation of the ethylene-tetrafluoroethene copolymer by an emulsion polymerization method using ethylene and tetrafluoroethene as raw materials, wherein the polymerization temperature is 40-55 DEG C, and sintering the obtained polymer at 320-350 DEG C after the polymerization iscompleted. The ETFE resin prepared by the method of the invention has good thermal stability during processing and application and has a melting point of 240-275 DEG C, tensile strength of amount 40-52 MPa and elongation at break of 300%. Moreover, the method of the invention is environmentally friendly, benefits for the industrialization and can realize mass production.

Description

technical field [0001] The invention relates to the technical field of polymer synthesis, in particular to an ethylene-tetrafluoroethylene copolymer and a preparation method thereof. Background technique [0002] Ethylene-tetrafluoroethylene copolymer (ETFE) is also called fluoroplastic-40 (ETFE or F-40 for short). ETFE is the strongest fluoroplastic. It maintains the good heat resistance, chemical resistance and electrical insulation of PTFE. At the same time, its radiation resistance and mechanical properties have been greatly improved, and its tensile strength can reach 50MPa, which is almost twice that of polytetrafluoroethylene. More importantly, its processing performance has been greatly improved, especially its strong adhesion to metal surfaces, so that the tight lining process between fluoroplastics and steel is being realized, that is, the production of fluoroplastic ETFE rotary linings that is often said in the industry craft. The relative density of ETFE is rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F214/26C08F2/22C08F4/40
CPCC08F2/22C08F4/40C08F210/02C08F214/265
Inventor 余金龙汪仲权张廷健曾波
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD