Method for producing a fluoroelastomer

一种制造方法、弹性体的技术，应用在含氟弹性体的制造领域，能够解决问题未明确等问题，达到提高特性的效果

Active Publication Date: 2009-02-04
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In Cited Document 3, potassium salt or sodium salt of perfluorohexanoic acid is described as an emulsifier used in the emulsion polymerization of hexafluoropropylene and vinylidene fluoride, but it is not used in the examples. Its problems are not clear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] 3273ml of pure water was added to a polymerization tank made of SUS with an inner volume of 6L, and 16.4g (solid content, 2500ppm relative to water) of 50%C was added. 5 f 11 COONH 4 The aqueous solution, after vacuum nitrogen replacement, is pressed into the mixed monomer composed of vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene with a monomer composition of 44 / 16 / 40 mol% at 80°C to make the pressure 1.52MPa. While stirring at 280 rpm, 0.14 ml of isopentane and a solution obtained by dissolving 0.51 g of ammonium persulfate in 4 ml of pure water were added to initiate polymerization.

[0059] When the pressure dropped to 1.42MPa, 58 / 20 / 22mol% mixed monomers of vinylidene fluoride, tetrafluoroethylene and hexafluoropropylene were added to raise the pressure to 1.52MPa. This process was repeated, and when the weight of the added monomer was 1210 g, the supply of the monomer was stopped, the gaseous monomer in the polymerization tank was discharged, c...

Embodiment 2

[0062] Add 3273ml of pure water to a polymerization tank made of SUS with an inner volume of 6L, and add 13.1g (solid content, 2000ppm relative to water) of 50%C 5 f 11 COONH 4Aqueous solution, after vacuum nitrogen replacement, pressurized 70 / 30 mol% mixed gas of vinylidene fluoride and hexafluoropropylene at 80°C to make the pressure 1.52MPa, under stirring at 280rpm, add 0.1ml of isopentane and A solution obtained by dissolving 0.86 g of ammonium persulfate in 4 ml of pure water was used to initiate polymerization.

[0063] When the pressure dropped to 1.42MPa, a mixed gas of 78 / 22 mol% vinylidene fluoride and hexafluoropropylene was added to increase the pressure to 1.52MPa. Repeat this process, when the additional mixed monomer is 572g, the temperature is lowered to 60°C, and when the pressure is 1.03MPa, 28.7g of diisopropyl peroxydicarbonate is dissolved in HCF at 40% by weight. 2 CF 2 CH 2 The solution obtained in OH. When the pressure drops to 0.92MPa, add the m...

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Abstract

The present invention provides a method for producing a fluoroelastomer using an emulsifier which is inexpensive and hardly remains in product polymers. The present invention is related to a method for producing a fluoroelastomer, wherein vinylidene fluoride and at least one fluoroolefin monomer other than vinylidene fluoride are copolymerized in the manner of an emulsion polymerization in the presence of an emulsifier represented by C5F11COOM, wherein M represents H, NH4 or an alkali metal.

Description

technical field [0001] The present invention relates to a method for producing fluoroelastomers. Background technique [0002] In the emulsion polymerization of fluoroelastomers, perfluoro fatty acids and their derivatives are widely used as emulsifiers, and ammonium perfluorooctanoate (C 7 f 15 COONH 4 ). Ammonium perfluorooctanoate has excellent emulsion polymerizability, but it is expensive and tends to remain in the resulting polymer during coagulation, making the vulcanization of the rubber composition for vulcanization slow and time-consuming, or the characteristics of the obtained vulcanized compound deteriorated, Therefore, it is necessary to perform a sufficient washing process before drying. [0003] In Patent Document 1, it is described that the use of C 6 f 13 CH 2 CH 2 SO 3 M was used as an alternative emulsifier for ammonium perfluorooctanoate, but it was found that the polymer changed, which was thought to be caused by the chain transfer reaction of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F2/26
CPCC08F214/22C08F2/26
Inventor 岸根充北市雅纪守田滋田中芳树太田大助
Owner DAIKIN IND LTD
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