| 摘要 |
A continuous coagulation process of PTFE or modified PTFE fine powders, comprising:a1) dilution in a lift of a PTFE latex up to a concentration from 5 to 25% w/w of PTFE, and optional filtration of the obtained diluted latex,b1) latex pressurization in the lift by an inert gas, preferably air, until a relative pressure, related to the atmospheric pressure, in the range 3-40 kg/cm<2 >(0.3-4 MPa),c1) addition of an acid electrolyte solution,d1) latex flowing from the mixer through a capillary tube under turbulent flow conditions,e1) granulation (coagulation) of the gel obtained in step d1) by mechanical stirring with a specific power from 1.5 to 10 kW/m<3>, maintaining the stirring until fine powder flotation,f1) separation of the underlying water from the fine powder.
|
