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Polyfluortetraethylene water-based emulsion, polyfluortetraethylene fine powder and preparation method

A polytetrafluoroethylene, water-based emulsion technology, applied in the field of chemical production, can solve the problem that the molecular weight of fluoropolymer is not high enough

Active Publication Date: 2018-08-10
SANMING HEXAFLUO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, for fluorine-containing emulsifiers, if hydrogen atoms are introduced into the molecules of fluorine-containing emulsifiers, chain transfer is likely to occur during the polymerization of fluorine-containing monomers, so there is a problem that the molecular weight of the obtained fluorine-containing polymers is not high enough.

Method used

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  • Polyfluortetraethylene water-based emulsion, polyfluortetraethylene fine powder and preparation method
  • Polyfluortetraethylene water-based emulsion, polyfluortetraethylene fine powder and preparation method
  • Polyfluortetraethylene water-based emulsion, polyfluortetraethylene fine powder and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0081] A preparation method of polytetrafluoroethylene aqueous emulsion, comprising the following steps:

[0082] (1) Add 20g of fluorine-containing emulsifier, 60g stabilizer, and 15L deionized water to a polymerization tank with a volume of 30L, then repeatedly press in nitrogen and remove under reduced pressure, so that the oxygen content in the polymerization tank is less than 30ppm;

[0083] (2) Stir the polymerization tank in step (1) and heat up to 70°C with 80 rpm, then press tetrafluoroethylene monomer until the internal pressure reaches 0.8MPa, then add 500g of ammonium persulfate aqueous solution with a mass fraction of 0.06%, Tetrafluoroethylene was added during the reaction to maintain the internal pressure at 0.8MPa;

[0084] (3) Supply tetrafluoroethylene monomer so that the solid mass fraction of the obtained aqueous dispersion is 30%, stop stirring, and empty the tetrafluoroethylene in the polymerization tank to obtain a polytetrafluoroethylene aqueous emulsio...

Embodiment 2

[0101] A preparation method of polytetrafluoroethylene aqueous emulsion, comprising the following steps:

[0102] (1) Add 20g of fluorine-containing emulsifier, 60g stabilizer, and 15L deionized water to a polymerization tank with a volume of 30L, then repeatedly press in nitrogen and remove under reduced pressure, so that the oxygen content in the polymerization tank is less than 30ppm;

[0103] (2) Stir the polymerization tank in step (1) at 80 rpm and heat up to 70°C, then press tetrafluoroethylene monomer until the internal pressure reaches 0.8MPa, then add 500g of ammonium persulfate aqueous solution with a mass fraction of 0.06%, Tetrafluoroethylene was added during the reaction to maintain the internal pressure at 0.8MPa;

[0104] (3) Supply tetrafluoroethylene monomer so that the solid mass fraction of the obtained aqueous dispersion is 30%, stop stirring, and empty the tetrafluoroethylene in the polymerization tank to obtain a polytetrafluoroethylene aqueous emulsion....

Embodiment 3

[0138] A preparation method of polytetrafluoroethylene aqueous emulsion, comprising the following steps:

[0139] (1) Add 20g of fluorine-containing emulsifier, 60g stabilizer, and 15L deionized water to a polymerization tank with a volume of 30L, then repeatedly press in nitrogen and remove under reduced pressure, so that the oxygen content in the polymerization tank is less than 30ppm;

[0140] (2) Stir the polymerization tank in step (1) and heat up to 70°C with 80 rpm, then press tetrafluoroethylene monomer until the internal pressure reaches 0.8MPa, then add 500g of ammonium persulfate aqueous solution with a mass fraction of 0.06%, Tetrafluoroethylene was added during the reaction to maintain the internal pressure at 0.8MPa;

[0141] (3) Supply tetrafluoroethylene monomer so that the solid mass fraction of the obtained aqueous dispersion is 30%, stop stirring, and empty the tetrafluoroethylene in the polymerization tank to obtain a polytetrafluoroethylene aqueous emulsion....

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Abstract

The invention discloses a polyfluortetraethylene water-based emulsion, polyfluortetraethylene fine powder and a preparation method. The method comprises the following steps that polyfluortetraethyleneis singly subjected to emulsion polymerization in a water-based medium or is subjected to emulsion polymerization in the water-based medium together with other copolymerizable monomers to obtain thepolyfluortetraethylene water-based emulsion, wherein the emulsion polymerization process is performed under the existence condition of fluorine-containing emulsifying agents and stabilizing agents. The invention relates to the polyfluortetraethylene water-based emulsion, the polyfluortetraethylene fine powder and the preparation method. Environment problem caused by perfluoro caprylic acid or perfluoro caprylic acid salt does not exist. The water-based emulsion comprises polytetrafluoroethylene with high molecular weight; the average primary particle diameter reaches 0.18 to 0.50mu m. Variouscharacteristics such as extrusion shaping performance of the polyfluortetraethylene fine powder are excellent; the mechanical property is good; the polyfluortetraethylene fine powder can be used for preparing polyfluortetraethylene porous bodies; the obtained polyfluortetraethylene porous bodies have various excellent characteristics.

Description

technical field [0001] The invention relates to the preparation of polytetrafluoroethylene or copolymerized modified polytetrafluoroethylene aqueous emulsion and polytetrafluoroethylene fine powder by using a fluorine-containing emulsifier that does not contain long-chain alkyl groups such as perfluorooctanoic acid, and belongs to the technical field of chemical production. Background technique [0002] When using emulsion polymerization to manufacture fluorine-containing polymers such as polytetrafluoroethylene (hereinafter referred to as PTFE), in order not to hinder the polymerization reaction of fluorine-containing monomers due to chain transfer in aqueous media, fluorine-containing emulsifiers are usually used . [0003] Polytetrafluoroethylene aqueous emulsion is obtained by emulsion polymerization of tetrafluoroethylene (hereinafter referred to as TFE). By coagulating and drying this aqueous emulsion, a fine powder of polytetrafluoroethylene is produced. The fine po...

Claims

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Application Information

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IPC IPC(8): C08F114/26C08F6/22C08L27/18C08F2/30
CPCC08F2/30C08F6/22C08F114/26C08L27/18
Inventor 吴成英张运文邹灿邱晓辉江丽军谢伟东吕涛张威王孟英
Owner SANMING HEXAFLUO CHEM CO LTD
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