A kind of preparation method of polytetrafluoroethylene film
A technology of polytetrafluoroethylene membrane and polytetrafluoroethylene, which is applied in the field of preparation of hydrophobic membrane materials, can solve the problems of only focusing on the removal of fiber-forming templates, and achieve the effect of uniform fiber shape, improved strength and toughness, and intact surface
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Embodiment 1
[0027] The polytetrafluoroethylene emulsion with a solid content of 60% is added dropwise to an aqueous solution of polyvinyl alcohol with a mass fraction of 12%, and stirred evenly to form a spinning solution. Then the polytetrafluoroethylene precursor film was fabricated by electrospinning method. Winding on a cylindrical support mold with a diameter of 5cm, winding 5 layers, and sending it to a tube furnace with nitrogen gas, the temperature of the sintering process is controlled by a program, and the temperature is raised from room temperature to 110°C at 10°C / min, kept at 110°C for 90min, and at 7°C The heating rate is raised from 110°C to 290°C / min, the temperature is kept at 290°C for 100 minutes, the temperature is raised from 290°C to 380°C, the heating rate is 6°C / min, and the temperature is kept for 60 minutes. After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thickness of 156 μm, whi...
Embodiment 2
[0029]The polytetrafluoroethylene emulsion with a solid content of 60% was added dropwise to an aqueous solution of polyacrylic acid with a mass fraction of 9%, and stirred evenly to prepare a spinning solution. Then the polytetrafluoroethylene precursor film was fabricated by electrospinning method. Winding on a cylindrical support mold with a diameter of 5cm, winding 5 layers, and sending it to a tube furnace with nitrogen gas. The temperature of the sintering process is controlled by a program. / min The heating rate is raised from 90°C to 260°C, the temperature is kept at 260°C for 120 minutes, the temperature is raised from 260°C to 375°C, the heating rate is 8°C / min, and the temperature is kept for 115 minutes. After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thickness of 165um, which can be cut to obtain a flat porous membrane. The membrane has a hydrophobic contact angle of 159°, a poro...
Embodiment 3
[0031] The polytetrafluoroethylene emulsion with a solid content of 60% was added dropwise to a sodium alginate aqueous solution with a mass fraction of 5%, and stirred evenly to prepare a spinning solution. Then the polytetrafluoroethylene precursor film was fabricated by electrospinning method. Winding on a cylindrical support mold with a diameter of 5cm, winding 5 layers, and sending it to a tube furnace with nitrogen gas. The temperature of the sintering process is controlled by a program. / min The heating rate is raised from 100°C to 275°C, the temperature is kept at 275°C for 110 minutes, the temperature is raised from 275°C to 380°C, the heating rate is 3°C / min, and the temperature is kept for 90 minutes. After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thickness of 171um, which can be cut to obtain a flat porous membrane. The membrane has a hydrophobic contact angle of 163°, a porosity...
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