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Method for preparing ethylene-tetrafluoroethylene copolymers

A technology of tetrafluoroethylene and copolymers, which is applied in the field of fluorine-containing polymer materials, can solve the problems of difficult recovery of synthetic solvents, long reaction time, and low product output, and achieve excellent physical and chemical properties, improve physical properties, and high output. Effect

Active Publication Date: 2012-07-04
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] In the field of ETFE synthesis, in patents such as JP2004-191260 and JP2003-286166, ethylene (E) / tetrafluoroethylene (TEF) is mainly used for synthesis in a 1 / 1 molar ratio solution polymerization method, and the recovery of the synthesis solvent is difficult and the reaction time is long. Product yield is low

Method used

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  • Method for preparing ethylene-tetrafluoroethylene copolymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a 10L stainless steel vertical reaction kettle, add 6000g of perfluorocyclohexane, blow nitrogen and exhaust oxygen three times, evacuate to oxygen content of 13ppm, add CF 3 O(CF(OCF 3 ) CF 2 O) 6 (CF 2 OO)COONH 4 10g, sodium dihydrogen phosphate 8g, pentane 3ml, start stirring, speed 200rpm, heat up to 40°C, add ethylene, tetrafluoroethylene, perfluoropropylene (35 / 50 / 15mol%) to 4.0MPa, add perfluorodihexyl 5g of peroxide, continuous addition of mixed monomers of ethylene and tetrafluoroethylene (48 / 52mol%) to keep the pressure of the reactor at 4.0MPa, and unreacted monomers were recovered after 4 hours of reaction to obtain 1.1Kg of ETFE polymer. Product performance indicators are shown in Table 2.

[0034] Table 2 Product Performance Index

[0035] Test items

Embodiment 2

[0037] In a 10L stainless steel vertical reaction kettle, add 6000g of perfluorocyclohexane, blow nitrogen and exhaust oxygen three times, evacuate to oxygen content of 19ppm, add CF 3 O(CF(OCF 3 ) CF 2 O) 6 (CF 2 OO)COONH 4 10g, sodium dihydrogen phosphate 8g, pentane 3ml, start stirring, speed 200rpm, heat up to 40°C, add ethylene, tetrafluoroethylene, perfluoromethyl vinyl ether mixed monomer (40 / 50 / 10mol%) to 4.0 MPa, add perfluorodihexyl peroxide 5g, continuously add ethylene, tetrafluoroethylene (48 / 52mol%) mixed monomer to keep the reactor pressure 4.0MPa, reclaim the unreacted monomer after reacting for 6h, get ETFE polymer 1.2 Kg. The performance indicators of polymers are shown in Table 3.

[0038] Table 3 Product Performance Index

[0039] Test items

Embodiment 3

[0041] In a 10L stainless steel vertical reaction kettle, add 6000g of perfluorocyclohexane, blow nitrogen and exhaust oxygen three times, evacuate to oxygen content of 19ppm, add CF 3 O(CF(OCF 3 ) CF 2 O) 6 (CF 2 OO)COONH 4 10g, sodium dihydrogen phosphate 8g, pentane 3ml, start stirring, speed 200rpm, heat up to 40°C, add ethylene, tetrafluoroethylene, perfluoropropylene, perfluoromethyl vinyl ether mixed monomer (40 / 50 / 8 / 2mol%) to 4.0MPa, add 5g of perfluorodihexyl peroxide, continuously add ethylene, tetrafluoroethylene (48 / 52mol%) mixed monomer to keep the pressure of the reactor at 4.0MPa, and recover the unreacted monomer after reacting for 8h , to obtain 1.1Kg of ETFE polymer. The performance indicators of polymers are shown in Table 4.

[0042] Table 4 Product performance indicators

[0043] Test items

[0044] Through Examples 1 to 3, by adding different modified monomers, the performance index requirements of the product can be met, but after the ...

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Abstract

The invention relates to a method for preparing an ethylene-tetrafluoroethylene copolymer, wherein a solution precipitation polymerization method is adopted; polymeric monomers adopt tetrafluoroethylene, fluorinated modified monomers and ethylene; the molar percentage of tetrafluoroethylene, the fluorinated modified monomers and ethylene is (30mol%-70mol%):(5 mol%-20mol%):(20 mol%-50mol%); the fluorinated modified monomers are perfluoropropylene and / or perfluoroalkyl vinyl ethers; and the monomers that are added during the polymerization process are the mixture of tetrafluoroethylene and ethylene. The product obtained by adopting the method achieves excellent processability and optical properties, and can be used as membrane materials.

Description

technical field [0001] The invention relates to the field of fluorine-containing polymer materials, in particular to a preparation method of ethylene-tetrafluoroethylene copolymer. Background technique [0002] Ethylene-tetrafluoroethylene copolymer (ETFE) is the strongest fluoroplastic. While maintaining the good heat resistance, chemical resistance and electrical insulation properties of tetrafluoroethylene (PTFE), its radiation resistance and The mechanical properties have been greatly improved, the tensile strength can reach 50MPa, and its processing performance has also been greatly improved, especially its adhesion to the metal surface has been greatly improved, so that the tight lining process of fluoroplastics and steel can be truly realized, such as fluorine Plastic RTFE rotary lining production process. [0003] The density of ETFE is lower than that of PTFE and FEP, but its toughness, hardness, tensile strength and weaving resistance are better than PTFE and FEP....

Claims

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Application Information

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IPC IPC(8): C08F214/26C08F210/02C08F214/18C08F216/14C08F2/38C08L27/18
Inventor 赵少春李斌高家勇张建新刘华国李健
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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