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Agglomeration washing method of fluorinated ethylene propylene

A technology of polyperfluoroethylene propylene and washing method, which is applied in the field of polymers and can solve the problems of long cycle and the like

Inactive Publication Date: 2007-07-25
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the acid radical particles and metal ions remaining in the polymerization process will affect the appearance of the product, the material after demulsification and precipitation should be further washed to remove the residual acid radical ions and metal ions for further processing, but at present The cycle of demulsification washing is too long, and manufacturers need to increase equipment to improve their production capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: polyperfluoroethylene propylene coagulation washing method, the steps are as follows:

[0022] (1) Add 350ml of deionized water at a temperature of 1 to 10°C to 140ml of polyperfluoroethylene propylene emulsion, and then start stirring. The demulsification time is 8 minutes.

[0023] (2) Then pour out the water, add 300ml of ion-free water at about 65°C to the powder for washing, and pass the test after repeated washing for 4 times. The conductivity of the water after washing was measured to be 2.4μs / cm. In order to confirm the result, the conductivity changed to 1.9μs / cm after the fifth washing, indicating that the result is accurate.

Embodiment 2

[0024] Embodiment 2: polyperfluoroethylene propylene coagulation washing method, the steps are as follows:

[0025] (1) to 1m 3 Add 200L polyperfluoroethylene propylene emulsion to the coagulation bucket, then add 450L deionized water (1-10°C), start stirring at a stirring speed of 1000r / min for coagulation, and observe the changes of materials during the coagulation process.

[0026] (2) Add the condensed powder to 400L deionized water at about 65°C for washing, record the conductivity of the water after washing from the third time, and measure the conductivity of the water after washing to 2.8μs / cm after the fourth washing .

[0027] Conclusion: The coagulation time in step (1) with cold water is 30 minutes, which is 1 / 3 shorter than the coagulation time in normal temperature water. In step (2), it is qualified after washing for the fourth time, but it is unqualified after six times of washing in normal temperature water.

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PUM

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Abstract

This invention discloses a method for condensing and washing perfluoroethylene-perfluoropropylene copolymer prepared by emulsion polymerization. The method comprises: (1) adding 1-10 deg.C deionized water to perfluoroethylene-perfluoropropylene copolymer emulsion, stirring, demulsifying, and washing the precipitate with 40-80 deg.C deionized water for 2-6 times (1-5 min for each time). The method can largely increase the equipment productivity, lower the consumption of pure water, save the raw materials, and shorten the treatment period.

Description

technical field [0001] The invention relates to a polyperfluoroethylene propylene coagulation washing method and belongs to the technical field of macromolecules. Background technique [0002] Polyfluoroethylene propylene is a copolymer of tetrafluoroethylene and hexafluoropropylene, which has excellent properties similar to polytetrafluoroethylene, and has the characteristics of thermoplastic molding, and has good adhesion to glass and metal, so it is widely used Applications. It is the most important modified variety of PTFE, and its main use is as a high temperature resistant wire and cable insulation material. [0003] Polyfluoroethylene propylene was first successfully developed by SAUER of DuPont Company in the United States in 1946. It reacted at 25-65Mpa and 55-64°C for nearly 10 hours to prepare a processable FEP film. On this basis, through the efforts of scientists from various countries, it can now be prepared by bulk polymerization, solution polymerization, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F6/16C08F214/18
Inventor 刘中平苗忠杰于昊范慧鹏
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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