METHOD FOR PRODUCING PTFE-BASED MEMBRANE TO PREVENT FORMATION AND REMOVE ICE FROM WIND GENERATOR BLADES AND ITS APPLICATION Russian patent published in 2022 - IPC B29D7/01 B29C63/02 C08J5/18 C08L27/18 C08L83/04 C09K3/18 

FIELD: polymer composites.

SUBSTANCE: present invention relates to the technical field of polymer composites, to a method for producing a membrane based on polytetrafluoroethylene (PTFE) to prevent the formation and removal of icing from the blades of a wind turbine. This method includes the steps: obtaining a core material of the membrane and obtaining a membrane by hot calendering. The rod material is obtained by impregnating PTFE resin with vinyl silicone oil at a weight ratio of (2-3):100 and stirring at room temperature to obtain a powder. The mixed resin powder is pre-pressed in a material pre-compression barrel at a temperature of 60-90°C under a pressure of 5-8 MPa to obtain a blank core material. The core material of the workpiece is subjected to hot pushing in a barrel for hot pushing of the material at a temperature of 60-90°C under a pressure of 5-8 MPa to obtain a core material of the membrane. The membrane is prepared in the following steps: the obtained membrane rod material is subjected to microscale polymerization with hot calendering in a hot calendering plant. The gap distance between the two upper and lower pressurized oil calender rolls of the hot calendering machine is set as the thickness of the resulting membrane. The temperature of the calendering rolls is 60-90°C. The core material of the membrane is extruded from the nip between the calendering rolls at a speed of 20-30 m/min in the clockwise rotation direction of the calendering rolls, evenly stretching the two sides forward under the effect of temperature and stretching by hot calendering. The membrane is separated to obtain a tissue-like structure after lamellar peeling to obtain a homogeneous membrane. The contact angle between water drops and the membrane surface is 115.89°-125.46°. The morphology of the membrane surface has the form of a micron concave-convex structure with an average size of 10-20 mcm, a height of 8-10 mcm and a step of 20-30 mcm, which can be evenly distributed in the longitudinal and transverse directions.

EFFECT: development of a method for obtaining a PTFE-based membrane to prevent the formation and removal of ice from the blades of a wind turbine.

1 cl, 3 dwg, 2 ex