Agglomeration washing method of fluorinated ethylene propylene

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...