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A kind of coagulation washing method of perfluorinated ethylene propylene resin

A technology of perfluoroethylene propylene and polyfluoroethylene propylene, which is applied in the field of polymers, can solve the problems of incomplete coagulation and precipitation of polyfluoroethylene propylene resin, waste of polyfluoroethylene propylene resin, unfavorable industrial production, etc., and achieves easy Washing removal, simple steps, environmentally friendly effect

Active Publication Date: 2019-11-22
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] Patent CN101003585A discloses the coagulation washing method of polyperfluoroethylene propylene emulsion. The coagulation method is to add low-temperature water to the polyfluoroethylene propylene emulsion, and then adopt mechanical coagulation. The coagulation washing method cannot remove the polyfluoroethylene propylene in the emulsion. The resin is completely coagulated and precipitated, and there is about 5% polyperfluoroethylene propylene resin in the condensed emulsion, which not only causes waste of polyfluoroethylene propylene resin, but also is not conducive to environmental friendliness, and the method uses frozen water, High energy consumption, not conducive to industrial production

Method used

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  • A kind of coagulation washing method of perfluorinated ethylene propylene resin
  • A kind of coagulation washing method of perfluorinated ethylene propylene resin

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Embodiment 1

[0032] This embodiment relates to a preparation method of polyperfluoroethylene propylene resin, comprising the following steps:

[0033] 1) Add ion-free water at room temperature to the polyfluoroethylene propylene emulsion, adjust the specific gravity of the emulsion to 1.08, start stirring, and physically break the emulsion at 1200 rpm for 25 minutes;

[0034] 2) Add coagulant ammonium bicarbonate with a resin solid content of 2% to the above emulsion, and continue to stir at the same speed until the polyperfluoroethylene propylene emulsion is completely demulsified;

[0035] 3) Wash it several times with normal temperature deionized water with a volume ratio of 1 / 2 to 2 / 3 to the polyperfluoroethylene propylene precipitated from demulsification, until the conductivity of the washing water is lower than 3 us / cm after detection, That's it.

Embodiment 2

[0037] This embodiment relates to a preparation method of polyperfluoroethylene propylene resin, comprising the following steps:

[0038] 1) Add ion-free water at room temperature to the polyfluoroethylene propylene emulsion, adjust the specific gravity of the emulsion to 1.06, start stirring, and physically demulsify the emulsion at 1600 rpm for 23 minutes;

[0039] 2) Add coagulant ammonium bicarbonate with a resin solid content of 1.8% to the above emulsion, and continue to stir at the same speed until the polyperfluoroethylene propylene emulsion is completely demulsified;

[0040] 3) Wash it several times with normal temperature deionized water with a volume ratio of 1 / 2 to 2 / 3 to the polyperfluoroethylene propylene precipitated from demulsification, until the conductivity of the washing water is lower than 3 us / cm after detection, That's it.

Embodiment 3

[0042] This embodiment relates to a preparation method of polyperfluoroethylene propylene resin, comprising the following steps:

[0043] 1) Add ion-free water at room temperature to the polyfluoroethylene propylene emulsion, adjust the specific gravity of the emulsion to 1.09, start stirring, and physically break the emulsion at 1400 rpm for 25 minutes;

[0044] 2) Add coagulant ammonium bicarbonate with a resin solid content of 1.5% to the above emulsion, and continue to stir at the same speed until the polyperfluoroethylene propylene emulsion is completely demulsified;

[0045] 3) Wash it several times with normal temperature deionized water with a volume ratio of 1 / 2 to 2 / 3 to the polyperfluoroethylene propylene precipitated from demulsification, until the conductivity of the washing water is lower than 3 us / cm after detection, That's it.

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Abstract

The invention relates to a condensation and washing method of perfluoroethylene propylene resin. The condensation and washing method comprises the following steps: 1) adding room-temperature de-ionized water into perfluoroethylene propylene emulsion and adjusting the emulsion ratio to be 1.03 to 1.20; starting to stir and carrying out physical emulsion breaking on the emulsion for 15 to 60 min under the condition of 500 to 2000 r / min; 2) adding a condensation agent ammonium bicarbonate with the resin solid content of 1 to 5 percent into the emulsion and continually stirring until the perfluoroethylene propylene emulsion is completely broken; 3) repeatedly washing perfluoroethylene propylene, which is separated through the emulsion breaking, by utilizing the room-temperature de-ionized water until the detection is qualified. The method provided by the invention is used for carrying out the emulsion breaking and can be used for completely separating out the resin in the perfluoroethylenepropylene emulsion; compared with other methods, the subsequent dosage of washing water is not increased. The method provided by the invention is simple in steps and environmentally friendly, and industrialized large-scale production is facilitated.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a coagulation and washing method of perfluoroethylene propylene resin. Background technique [0002] Polyfluorinated ethylene propylene resin (FEP) is a thermoplastic resin with good processability, excellent high and low temperature resistance and excellent chemical stability. Its most outstanding property is electrical insulation (for example, it has the same dielectric constant as PTFE, 2.1). The superior electrical insulation performance and easy processing performance, low flame spread and low smoke generation make this copolymer mainly used as insulating material in integrated circuit boards and wires and cables. The copolymer can be processed into various forms of products by common thermoplastic processing methods, such as extrusion molding, molding, and spraying processing, so that it is widely used in the electrical and electronic industry, chemical industry, machiner...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F6/22C08F214/26C08F214/28
CPCC08F6/22C08F214/26C08F214/28
Inventor 余金龙汪仲权张廷健曾波王先荣龚蓉李慧
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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