Preparation method of PTFE-based membrane for preventing and removing ices covering wind turbine blades and use thereof

A method of making a polytetrafluoroethylene (PTFE)-based membrane for preventing and removing ice covering wind turbine blades, comprising the following steps:

• infiltrating PTFE resin powder with vinyl silicone oil, wherein a mass ratio of the vinyl silicone oil to the PTFE resin is (2-3):100,
• blending the PTFE resin powder and the vinyl silicone oil at room temperature to prepare a blended resin powder,
• pre-compressing the blended resin powder in a pre-compressing material barrel at a temperature of 60-90° C. under a pressure of 5-8 MPa and fusion polymerizing the PTFE resin and vinyl silicone oil monomers to prepare a monomer polymerized blank rod material,
• hot pushing the monomer polymerized blank rod material in a hot pushing material barrel at a temperature of 60-90° C. under a pressure of 5-8 MPa to prepare a membrane rod material,
• subjecting the prepared membrane rod material to micro-scale polymerization hot calendering in a hot calendering machine, wherein a gap distance between upper and lower oil-heated pressure calendering rollers of the hot calendering machine is set as a thickness of a membrane to be prepared, and temperatures of the calendering rollers are 60-90° C., and
• extruding the membrane rod material through the gap between the calendering rollers at a rate of 20-30 m/min under a rotation of the calendering rollers while uniformly extending the membrane rod material toward two sides of the hot calendering machine under an action of temperature and hot calendering stretching, wherein the membrane is split to generate a structure resembling a fabric after laminar exfoliation of the membrane to prepare a homogeneous PTFE-based membrane with a set thickness,
• wherein a contact angle between water beads and a surface of the membrane is 115.89°-125.46°, a surface morphology of the membrane is exhibited as a micro concave-convex structure with an average size of 10-20 micrometers, a height of 8-10 micrometers and a spacing of 20-30 micrometers, which is uniformly distributed in longitudinal and latitudinal directions.