METHOD FOR INCREASING STRENGTH OF MEMBRANE BASED ON POLYTETRAFLUOROETHYLENE (PTFE) BY HIGH-TEMPERATURE MICROEUTECTICS UNDER HIGH LINE PRESSURE Russian patent published in 2022 - IPC B29C71/00 B29K27/18 B29L7/00 B32B33/00 

FIELD: polytetrafluoroethylene membrane strength increasing methods.

SUBSTANCE: present invention relates to a method for increasing the strength of a polytetrafluoroethylene (PTFE) membrane by means of a high temperature, high line pressure microeutectic. This method includes the steps of pushing the membrane forward into the cavity at a temperature of 70-420°C, the linear pressure of the surface of the PTFE membrane is controlled at 50-80 N/m and under the action of winding pull. Next, shrinkage of the molecular chains of the membrane and the creation of eutectic phases are provided. Multiple microeutectic molecular structures are arranged in parallel. The micropores between the molecular chains of the membrane become nanopores and have an ultramicron size. The color of the membrane after microeutectic changes from opaque milky white to transparent with high and uniform transparency. The membrane from a functional nanocomposite based on PTFE has macromolecular nanoaggregates and nano- and micron concave-convex geometric ultramicron structural morphologies with an average surface size of 10-20 µm, a height of 5-10 µm and a step of 10-20 µm.

EFFECT: development of a method for increasing the strength of a membrane based on polytetrafluoroethylene, providing increased abrasion resistance, fracture resistance and impact resistance.

5 cl, 1 ex