FEP release film is Fluorinated Ethylene Propylene Copolymer (Perfluoroethylene Propylene Copolymer, Perfluoroethylene Propylene), commonly known as F-46, which is copolymerized by tetrafluoroethylene and Hexafluoropropylene. The content of Hexafluoropropylene is about 15%, and it is a modified material of polytetrafluoroethylene. FEP resin, like polytetrafluoroethylene propylene, has a completely fluorinated structure, except that some of the fluorine atoms in the main chain of polytetrafluoroethylene are replaced by trifluoromethyl (- CF3). F-46Although both resin and polytetrafluoroethylene are composed of carbon and fluorine elements, and the carbon chain is completely surrounded by fluorine atomsFEP has branches and side chains on the main chain of its macromolecules. This structural difference has no significant impact on the upper limit of the temperature range of the material under long-term stress. The upper limit temperature of FEP is 200 ℃, while the maximum service temperature of PTFE is 260 ℃. However, this structural difference makes F-46 resin has a fairly certain melting point, mostly between 250-270 ℃, lower than polytetrafluoroethylene, and can be formed and processed using thermoplastic processing methods, which polytetrafluoroethylene does not have.

FEP has excellent chemical stability, corrosion resistance, sealing, high lubrication and non adhesion, electrical insulation and good anti-aging endurance, and can work for a long time at a temperature of+200 ℃ to -85 ℃. FEP resin not only has similar characteristics to polytetrafluoroethylene propylene, but also has good processing properties as thermoplastic. Therefore, it compensates for the difficulties in processing polytetrafluoroethylene propylene, making it a substitute material for polytetrafluoroethylene. It is used for making inner walls of pipes and chemical equipment, surface layers of drums, and various wires and cables, such as aircraft hook wires, booster cables, alarm cables, flat cables, and oil well logging cables. FEP release film is mainly used in fields such as communication cables, wires, semiconductors, chemical anti-corrosion, automobiles, industrial coatings, etc.

Technical implementation elements:

The preparation method of FEP release film includes an extruder, cooling roller, guide roller, corona mechanism, edge cutting machine, and winding device, as well as the following steps

Step 1, set theAfter thoroughly mixing FEP resin and color masterbatch, place them in a container and mix thoroughly to obtain the mixed material.

Step 2, add the mixed material obtained in Step 1 to the extruder through a weight loss feeding hopper, and the processing temperature is toAt 290-340 ℃, molten FEP resin was obtained.

Step 3, melt theFEP resin is extruded into a T-shaped flat mold to form a sheet like melt.

Step four,The FEP melt is cooled to form a thin film through a cooling roller at a temperature of 95-125 ℃.

Step 5, the film passes through the temperature againThe cooling roller at 30-50 ℃ obtains the final finalized film.

Step 6: After shaping, the surface of the film is treated by a corona mechanism to improve its surface performance.

Step 7: The edge cutting machine performs edge cutting, and then rolls the film through the winding device.

The preparation method of FEP release film is convenient for processing,which has high mechanical strength, light resistance, and weather resistance, and can be used as packaging film for drugs, medical devices, electronic components, military items, aerospace, and other fields.