HIGH-TEMPERATURE HIGH-LINEAR-PRESSURE MICRO-EUTECTIC METHOD FOR ENHANCING STRENGTH OF PTFE-BASED FILM

摘要

Disclosed is a high-temperature high-linear-pressure micro-eutectic method for enhancing the strength of a PTFE-based film, relating to the technical field of polymer composite materials. The method comprises: pushing a PTFE-based nano-functional composite film forward at a speed of 6-8 m/min in a high-temperature high-linear-pressure micro-eutectic cavity with a length of 1.5 m at 380°C, controlling the linear pressure of the surface of the PTFE film to be 50-80 N/m, and under the coiling traction of a film coiling roller outside the cavity, enabling the molecular chains of the film to shrink and generate a eutectic, wherein multiple micro-eutectic molecular structures are arranged in parallel with each other. The film has a density of 2.1 kg/m3, and has nanoscale macromolecular aggregates and an ultra-micro-structure morphology with nanoscale and micronscale size concave and convex geometries of an average surface size of 10-20 um, a height of 5-10 um, and a spacing of 10-20 um. The bonding and peeling strength is improved, and the method can be used for preventing the icing up of various types of fan blades.