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Fluorocopolymer

A fluorine copolymer and copolymerization reaction technology, applied in the field of fluorine copolymer, to achieve the effects of excellent cross-linking properties, excellent heat resistance and excellent low temperature characteristics

Inactive Publication Date: 2006-03-01
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, perfluoroelastomers excellent in low-temperature characteristics and also excellent in heat resistance, chemical resistance, etc. have not been developed yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A stainless steel autoclave having an internal volume of 2100 cc equipped with an anchor stirrer was degassed, then 1500 g of ion-exchanged water, 17 g of ammonium perfluorooctanoate and 304 g of PPVE were added thereto, and the gas phase was replaced with nitrogen. The internal temperature was raised to 60° C. and stirred with an anchor stirrer at a speed of 300 rpm. When the internal temperature reached 60° C., the pre-prepared TFE / PMVE=20 / 80 (molar ratio) gas mixture was injected until the internal pressure of the autoclave became 1.0 MPaG. 5 mL of a 2.5% by mass aqueous ammonium persulfate solution was added to initiate the polymerization reaction.

[0050] Because the internal pressure in the autoclave decreases with the progress of the polymerization reaction, when the pressure is reduced to 0.99Mpa, inject the mixed gas after injecting TFE / PMVE=70 / 30 (mol ratio), and the internal pressure in the autoclave is raised to 1.01MPaG. The polymerization reaction was c...

Embodiment 2

[0053] In addition to using C 4 f 9 OCF 2 CF 2 OCF 2 COONH 4 Fluorocopolymer 2 was prepared in the same manner as described in Example 1, except that ammonium perfluorooctanoate was used as the fluorinated emulsifier. The composition of the fluorocopolymer 2 is TFE-based repeating unit / PMVE-based repeating unit / PPVE-based repeating unit / BrVE-based repeating unit (molar ratio 53.4 / 23.8 / 21.4 / 1.4). The glass transition temperature of the fluorocopolymer 2 was -6.0°C, the fluorine content was 72.3% by mass, and the Mooney viscosity was 71. The physical properties of the crosslinked rubber sheet made from fluorocopolymer 2 are shown in Table 1. The heat resistance was evaluated and the results are listed in Table 1.

Embodiment 3

[0055] The same autoclave used in Example 1 was degassed, and then 1300 g of ion-exchanged water, 17 g of ammonium perfluorooctanoate, 304 g of PPVE and 4.1 g of 1,4-diiodooctafluorobutane were added thereto. The internal temperature was raised to 60° C. and stirred with an anchor stirrer at a speed of 300 rpm. When the internal temperature reached 60° C., the pre-prepared TFE / PMVE=10 / 90 (molar ratio) mixed gas was injected until the internal pressure of the autoclave became 1.0 MPaG. 5 mL of a 2.5% by mass aqueous ammonium persulfate solution was added to initiate the polymerization reaction.

[0056] Because the internal pressure in the autoclave decreases with the progress of the polymerization reaction, when the pressure was reduced to 0.99Mpa, inject the mixed gas after injecting TFE / PMVE=50 / 50 (mol ratio), and the internal pressure in the autoclave is raised to 1.01MPaG. The polymerization reaction was continued while this operation was repeated, maintaining the intern...

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Abstract

A fluorocopolymer which comprises repeating units (a) based on tetrafluoroethylene, repeating units (b) based on perfluoro(methyl vinyl ether) and repeating units (c) based on perfluoro(propyl vinyl ether) in a molar ratio of (a) / (b) / (c) of 40 to 70 / 3 to 57 / 3 to 57. The fluorocoplymer is a perfluoroelastomer which is excellent in low temperature characteristics, heat resistance and chemical resistance.

Description

technical field [0001] The present invention relates to a fluorine copolymer. technical background [0002] Vinylidene fluoride / hexafluoropropylene copolymers, tetrafluoroethylene / propylene copolymers, tetrafluoroethylene / perfluoro(alkyl vinyl ether) copolymers, and the like are known as fluorine-containing rubbers. [0003] Among them, tetrafluoroethylene / perfluoro(alkyl vinyl ether) copolymers are called perfluoroelastomers, and are known to have very excellent heat resistance and chemical resistance. [0004] JP-B-53-4115 discloses a perfluoroelastomer comprising tetrafluoroethylene (hereinafter referred to as TFE) / perfluoro(methyl vinyl ether) (hereinafter referred to as PMVE) / trifluorobromoethylene copolymer, PMVE was used as perfluoro(alkyl vinyl ether) (hereinafter referred to as PAVE). The low-temperature properties of this copolymer are insufficient. [0005] Also, Japanese Patent No. 3531974 discloses a tetrafluoroethylene / PMVE / perfluoro(polyether vinyl ether) c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/18C08L27/12
CPCC08F214/18
Inventor 舟木宙神谷浩樹
Owner ASAHI GLASS CO LTD
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