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Continuous condensation method of perfluorinated ethylene propylene emulsion

A technology of agglomeration method and continuous method, applied in the field of continuous agglomeration of polyperfluoroethylene propylene emulsion, can solve the problems of complex process, low equipment utilization rate, unfavorable washing, continuous drying and granulation process, etc.

Inactive Publication Date: 2015-01-21
SHANGHAI 3F NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1) The treatment method is intermittent, and the equipment utilization rate is low, which is not conducive to the continuous operation of subsequent washing, drying and granulation processes;
[0011] 2) The emulsion needs to be diluted with deionized water before coagulation, which increases the production cost and complicates the process

Method used

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  • Continuous condensation method of perfluorinated ethylene propylene emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Preparation of polyperfluoroethylene propylene resin emulsion

[0044] Add 1600L deionized water and 1800g perfluorooctanoic acid ammonium dispersant in the 2000L autoclave, fill nitrogen gas to test the pressure without leaking, after evacuating and analyzing the oxygen content is qualified, add quantitative initial monomer (mass ratio, Wt( TFE): Wt(HFP) = about 20:80) and heat up, when the temperature reaches 100°C and the pressure reaches 3.2MPa; use a metering pump to inject 90 grams of initiator potassium persulfate into the polymerization kettle to start the reaction, use a membrane The formula pump will add additional monomer (mass ratio, Wt(TFE):Wt(HFP) = about 95:5) into the polymerization tank to keep the reaction pressure constant; when the amount of added monomer reaches the specified value, stop the reaction. The solid content of the obtained polymeric emulsion was 30 wt%, the specific gravity of the emulsion was 1.18 at 20°C, and the melt viscosity at 3...

Embodiment 2

[0048] 1. Preparation of polyperfluoroethylene propylene resin emulsion

[0049] Add 1600L deionized water and 1800g perfluorooctanoic acid ammonium dispersant in the 2000L autoclave, fill nitrogen gas to test the pressure without leaking, after evacuating and analyzing the oxygen content is qualified, add quantitative initial monomer (mass ratio, Wt( TFE): Wt(HFP) = about 30:70) and heat up, when the temperature reaches 100°C and the pressure reaches 3.2MPa; use a metering pump to inject 90 grams of initiator potassium persulfate into the polymerization kettle to start the reaction, use a membrane The formula pump will add additional monomer (mass ratio, Wt(TFE):Wt(HFP) = about 80:20) into the polymerization tank to keep the reaction pressure constant; when the amount of added monomer reaches the specified value, stop the reaction. The solid content of the obtained polymeric emulsion was 30 wt%, the specific gravity of the emulsion was 1.18 at 20°C, and the melt viscosity at ...

Embodiment 3

[0053] 1. Preparation of polyperfluoroethylene propylene resin emulsion

[0054] Add 1600L deionized water and 1800g perfluorooctanoic acid ammonium dispersant in the 2000L autoclave, fill nitrogen gas to test the pressure without leaking, after evacuating and analyzing the oxygen content is qualified, add quantitative initial monomer (mass ratio, Wt( TFE): Wt(HFP) = about 25:75) and heat up, when the temperature reaches 100°C and the pressure reaches 3.2MPa; use a metering pump to inject 90 grams of initiator potassium persulfate into the polymerization kettle to start the reaction. The formula pump will add additional monomer (mass ratio, Wt(TFE):Wt(HFP) = about 85:25) into the polymerization tank to keep the reaction pressure constant; when the amount of added monomer reaches the specified value, stop the reaction. The solid content of the obtained polymeric emulsion was 30 wt%, the specific gravity of the emulsion was 1.18 at 20°C, and the melt viscosity at 372°C was 100 k...

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Abstract

The invention discloses a continuous condensation method of perfluorinated ethylene propylene emulsion. According to the continuous condensation method of the perfluorinated ethylene propylene emulsion, a pipeline type emulsifying machine with the following parameters is used: the effective volume ratio alpha (effective volume in a container / volume in the container) is less than or equal to 0.6 and greater than or equal to 0.2; the dynamic coefficient K is equal to Pv / mu / n<2>, wherein Pv is the power used by each unit volume and the unit is W / m<3>, mu is the viscosity of the emulsion and the unit is Pa.s, n is the rotation speed, and the unit is rps, and K is greater than or equal to 10000; continuous condensation is carried out on the perfluorinated ethylene propylene emulsion prepared by the emulsion polymerization method. The continuous condensation method provided by the invention is simple in process, dispenses with diluting the emulsion before the condensation, so that the dosage of the ionized water is saved and the production cost can be effectively reduced; moreover, the residual powder rate is low, and the condensation effect is good.

Description

technical field [0001] The invention relates to the field of coagulation of polymer emulsions, in particular to a continuous coagulation method of polyperfluoroethylene propylene emulsions. Background technique [0002] Polyfluoroethylene propylene (FEP) is a copolymer of tetrafluoroethylene (TFE) and hexafluoropropylene (HFP), which not only basically retains the excellent high temperature resistance, corrosion resistance, electrical properties and physical and mechanical properties of polytetrafluoroethylene. It also has the characteristics of thermoplastic molding, so it has good processing performance and a wide range of uses. [0003] The existing industrial polymerization methods of FEP mainly include emulsion polymerization and solution polymerization. Emulsion polymerization is widely used due to the advantages of simple operation, fast reaction speed, high equipment utilization rate and low production cost. [0004] The polyperfluoroethylene propylene resin prepar...

Claims

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Application Information

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IPC IPC(8): C08F6/22C08F214/28
Inventor 张畏锋李军巍史永德张叶斌吴君毅
Owner SHANGHAI 3F NEW MATERIAL
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