Preparation method of super-hydrophobic polytetrafluoroethylene film

A polytetrafluoroethylene membrane and polytetrafluoroethylene technology are applied in the field of preparation of hydrophobic membrane materials, which can solve the problem of only focusing on the removal of fiber-forming templates, and achieve the effects of uniform fiber shape, improved strength and toughness, and intact surface.

Active Publication Date: 2018-02-13
成都百途医药科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These reports all involve the step of high temperature sintering to remove the fiber-forming support, but these sintering processes only focus on the removal of the fiber-forming template

Method used

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  • Preparation method of super-hydrophobic polytetrafluoroethylene film

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Effect test

Embodiment 1

[0029]The polytetrafluoroethylene emulsion with a solid content of 60% is added dropwise to an aqueous gelatin solution with a mass fraction of 15%, 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 170 μm, which can be cut ...

Embodiment 2

[0031] The polytetrafluoroethylene emulsion with a solid content of 60% is added dropwise to an aqueous gelatin solution with a mass fraction of 8%, 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. / 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 185um, which can be cut to obtain a flat porous membrane. The membrane has a hydrophobic contact angle of 156°, a porosity of 83%, an...

Embodiment 3

[0033] The polytetrafluoroethylene emulsion with a solid content of 60% is added dropwise to a gelatin aqueous solution with a mass fraction of 6%, 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. / 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 190um, which can be cut to obtain a flat porous membrane. The membrane has a hydrophobic contact angle of 161°, a porosity of 85%, an ...

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Abstract

The invention provides a preparation method of a polytetrafluoroethylene film. The preparation method of the polytetrafluoroethylene film comprises the steps of preparing a spinning solution, making afiber and sintering. The preparation method is characterized in that a fiber forming carrier and a solvent are prepared into a solution, the solution is added into a polytetrafluoroethylene emulsion,the fiber forming carrier is gelatin, and the solvent is water; sectional continuous sintering is adopted through programmed temperature control, the heat is preserved at the temperature of 90-120 DEG C for 30-120 minutes under the flowing atmosphere, the temperature is raised from 90-120 DEG C to 260-300 DEG C at the speed of 3-10 DEG C per minute, and the heat is preserved at the temperature of260-300 DEG C for 30-120 minutes; the temperature is raised from 260-300 DEG C to 370-390 DEG C at the speed of 2-8 DEG C per minute, and the heat is preserved at the temperature of 370-390 DEG C for5-120 minutes; and the thickness of the polytetrafluoroethylene film is 170-212 [mu]m. The preparation method excellently solves the problem that a fiber collapses easily in the sintering of a polytetrafluoroethylene precursor film, a beaded superfine fiber network film is obtained, the state of the fibers is changed from disordered stacking to mutual adhesion, the fiber morphology is uniform, the surface is complete, the strength and the tenacity are also greatly improved, and the film can bear certain vacuum pressure.

Description

[0001] The application of the present invention is a divisional application with the application number 201410163074.7, the application date of April 22, 2014, and the title of the invention "a method for preparing a superhydrophobic polytetrafluoroethylene membrane". technical field [0002] The invention relates to a preparation method of a separation membrane material used in the separation field, in particular to a preparation method of a hydrophobic membrane material. technical background [0003] Hydrophobicity is an important property of polytetrafluoroethylene (PTFE) materials, and it is the main performance of PTFE porous membranes applied to membrane materials. Although polytetrafluoroethylene material has low surface energy, the water contact angle of smooth polytetrafluoroethylene plane is between 98° and 112°, and the hydrophobic performance is not good. [0004] At present, the biaxial stretching method is mostly used in the preparation of polytetrafluoroethyle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/02B01D67/00
CPCB01D67/0004B01D69/02B01D71/36B01D2325/02B01D2325/38
Inventor 姚永毅钟丕叶雷
Owner 成都百途医药科技有限公司
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