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Fluorine elastomer containing high fluorine content and preparation process thereof

A fluoroelastomer, content technology, used in the chemical field, can solve problems such as poor oil resistance and solvent resistance

Active Publication Date: 2008-07-30
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

The fluorine content of this type of fluoroelastomer is generally about 67%, and its oil resistance and solvent resistance are poor

Method used

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  • Fluorine elastomer containing high fluorine content and preparation process thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Add water medium and sodium perfluorooctanoate to the reactor, so that there is enough vapor space to accept gaseous mixed monomers in the reactor, the concentration of sodium perfluorooctanoate in the water medium is to add 0.001 parts by weight of sodium perfluorooctanoate in every 100 parts by weight of water medium, In the vapor space of the reactor, add 30% 1,1-difluoroethylene, 40% perfluoropropylene and 30% tetrafluoroethylene mixed monomer in molar percentage, mix to form emulsion, every 100 parts by weight of water Add 50 parts by weight of mixed monomers to the medium. Add potassium persulfate and sodium tetraborate, and polymerize at 20°C, 5MPa, and pH4 for 2 hours. The amount of potassium persulfate is 0.001 parts by weight of potassium persulfate per 100 parts by weight of water medium. Add it to the reactor in the form of a 7% aqueous solution. During the polymerization process, add carbon tetrachloride to the reactor at one time, add 0.1 parts by weight ...

Embodiment 2

[0031] Add water medium and perfluorooctanoic acid ammonium in the reactor, make the steam space that is enough to accept gaseous mixed monomer in the reactor, the concentration of perfluorooctanoic acid ammonium in the aqueous medium is to add 3 parts by weight of perfluorooctanoic acid ammonium in every 100 parts by weight of aqueous medium, In the vapor space of the reactor, add 60% 1,1-difluoroethylene, 20% perfluoropropylene and 20% tetrafluoroethylene mixed monomers in molar percentage, mix to form emulsion, every 100 parts by weight of water Add 150 parts by weight of mixed monomers to the medium. Add diisopropyl peroxydicarbonate and dipotassium hydrogen phosphate, and polymerize at 100° C. under 0.7 MPapH5 for 20 hours. The amount of diisopropyl peroxydicarbonate is 5 weight parts per 100 parts by weight of water medium Parts of diisopropyl peroxydicarbonate, diisopropyl peroxydicarbonate is added to the reactor in the form of a 0.1% aqueous solution by weight percent...

Embodiment 3

[0033] Add water medium and perfluorooctanoic acid ammonium in the reactor, make enough to leave the steam space that accepts gaseous mixed monomer in the reactor, the concentration of perfluorooctanoic acid ammonium in the aqueous medium is to add 0.05 weight part of perfluorooctanoic acid ammonium in every 100 weight parts of water medium, In the vapor space of the reactor, add 40% 1,1-difluoroethylene, 30% perfluoropropylene and 30% tetrafluoroethylene mixed monomers in molar percentage, mix to form emulsion, every 100 parts by weight of water Add 100 parts by weight of mixed monomers to the medium. Add diisopropyl peroxydicarbonate and dipotassium hydrogen phosphate, and polymerize for 11 hours under 3MPa pH6 at 60°C. The amount of diisopropyl peroxydicarbonate is 0.05 wt. Parts of diisopropyl peroxydicarbonate, diisopropyl peroxydicarbonate is added to the reactor in the form of a 3% aqueous solution by weight percentage. During the polymerization process, add diethyl ma...

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PUM

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Abstract

The present invention is fluoric elastomer with fluorine content higher than 70 %. The fluoric elastomer consists of the following copolymerized units: 1, 1-difluoro ethylene 30-60 wt%, perfluoro propylene 20-40 wt% and tetrafluoro ethylene 20-40 wt%. The present invention also relates to the preparation process of the fluoric elastomer with high fluorine content, and the preparation process is one emulsion polymerization process with water as medium, low molecular weight esters as chain transferring agent, persulfate as initiator, perfluoro caprylate as dispersant and borax as pH regulator.

Description

technical field [0001] The invention relates to the field of chemistry, in particular to a fluoroelastomer with high fluorine content and a preparation method thereof. Background technique [0002] With its excellent heat resistance, liquid resistance and oil resistance, as well as good physical and mechanical properties, electrical insulation and radiation resistance, fluororubber can work for a long time at 250°C and short-term work at 300°C. [0003] Viton can be widely used in aviation and aerospace, automobiles and off-road vehicles, oil exploration and petrochemical industry, industrial pollution control, hydraulic and pneumatic devices, etc. Especially in recent years, with the expansion of the application of fluororubber, the requirements for fluororubber are increasing day by day, and the existing fluororubber grades are increasingly unable to meet the market, which also stimulates the application market of special fluororubber. In the case of increasingly tense en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/20C08F2/16C08F2/24C08F2/38C08F214/28C08F214/26
Inventor 周晓斌张全张海波朱健全
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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