A kind of preparation method of hydrophobic and oleophobic ptfe film, the ptfe film that makes and application
A hydrophobic, oil-repellent, water-repellent and oil-repellent technology, applied in the direction of separation methods, chemical instruments and methods, membrane technology, etc., can solve problems such as damage, bag sticking, and reduced air flow, and achieve good hydrophobic and oil-repellent properties and good air permeability , Obvious effect of microporous structure
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Embodiment 1
[0042] Preparation method of hydrophobic and oleophobic PTFE membrane
[0043] (1) Preparation of waterproof and oil-repellent agent: under the protection of nitrogen, add perfluorobutylethylene and triethoxysilane into the xylene solution at a molar ratio of 1:1.1, and reflux at 80°C for 22 hours under the catalyst of 0.5‰Pt , filter, vacuum degree 0.07Mpa, and distill off the solvent under reduced pressure at a temperature of 110°C to obtain perfluorobutyltriethoxysilane; the principle is hydrosilylation reaction, and addition of silicon compounds containing Si-H to unsaturated organic compounds occurs reaction to form organosilicon compounds, figure 1 Prepare the reaction formula for this example.
[0044](2) Mixing: After mixing and stirring polytetrafluoroethylene resin powder, aviation kerosene, and polyisocyanate for 5 hours, add a water-repellent and oil-repellent agent and continue mixing and stirring for 10 hours, and ultrasonically treat at 30 Hz for 2 hours, and t...
Embodiment 2
[0054] Preparation method of hydrophobic and oleophobic PTFE membrane
[0055] Preparation of water and oil repellent: under the protection of nitrogen, add perfluorohexylethylene and triethoxysilane to the xylene solution at a molar ratio of 1:1.05, reflux at 80°C for 24 hours under the catalyst of 1‰Pt, filter, vacuum The temperature is 0.075Mpa, and the solvent is distilled off under reduced pressure at a temperature of 120°C to obtain perfluorohexyltriethoxysilane; the principle is a hydrosilylation reaction, and an addition reaction occurs between a silicon compound containing Si-H and an unsaturated organic compound to form organic silicon compound, figure 2 Prepare the reaction formula for this example.
[0056] (2) Mixing: After mixing and stirring polytetrafluoroethylene resin powder, aviation kerosene, and polyvinyl butyral for 8 hours, add a water-repellent and oil-repellent agent and continue mixing and stirring for 12 hours, and ultrasonically treat at 50 Hz for...
Embodiment 3
[0066] Preparation method of hydrophobic and oleophobic PTFE membrane
[0067] (1) Preparation of waterproof and oil repellent: under the protection of nitrogen, add perfluorooctylethylene and triethoxysilane to the xylene solution at a molar ratio of 1:1.15, and reflux at 90°C for 20h under the catalyst of 1‰Pt , filter, vacuum degree 0.08Mpa, and distill off the solvent under reduced pressure at a temperature of 130°C to obtain perfluorodecyltriethoxysilane; the principle is hydrosilylation reaction, and addition of silicon compounds containing Si-H to unsaturated organic compounds occurs reaction to form organosilicon compounds, image 3 Prepare the reaction formula for this example.
[0068] (2) Mixing: After mixing and stirring polytetrafluoroethylene resin powder, aviation kerosene, and cross-linking agent for 3 hours, add a water-repellent and oil-repellent agent, continue mixing and stirring for 12 hours, and perform ultrasonic treatment for 3 hours at an ultrasonic f...
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