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Production method of super-hydrophobic polytetrafluoroethylene membrane

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

Active Publication Date: 2015-10-28
成都百途医药科技有限公司
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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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  • Production method of super-hydrophobic polytetrafluoroethylene membrane

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Effect test

Embodiment 1

[0028] The polytetrafluoroethylene emulsion with a solid content of 60% is added dropwise to a polyacrylic acid aqueous solution with a mass fraction of 15%, 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, 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 / min The heating rate is raised from 110°C to 290°C, kept at 290°C for 100 minutes, raised from 290°C to 380°C, the heating rate is 6°C / min, and kept at 60 minutes. After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thickness of 165 μm, which can be cut to obtain a flat porous membrane. The membra...

Embodiment 2

[0030] The polytetrafluoroethylene emulsion with a solid content of 60% was added dropwise to an aqueous polyacrylic acid solution with a mass fraction of 8%, 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 160um, which can be cut to obtain a flat porous membrane. The membrane has a hydrophobic contact angle of 156°, a porosi...

Embodiment 3

[0032] The polytetrafluoroethylene emulsion with a solid content of 60% was added dropwise to a polyacrylic acid aqueous solution with a mass fraction of 6%, 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 166um, which can be cut to obtain a flat porous membrane. The membrane has a hydrophobic contact angle of 163°, a porosit...

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Abstract

The invention provides a production method of a super-hydrophobic polytetrafluoroethylene membrane. The method comprises the steps of preparing a spinning solution, producing fibers, and sintering, wherein a fiber forming carrier and a solvent are adopted to prepare a solution, a polytetrafluoroethylene emulsion is added, the fiber forming carrier is polyacrylic acid, and the solvent is water; and the sintering step adopts temperature programmed control sectional continuous sintering, and is characterized by carrying out heat insulation in flowing atmosphere at 90-120DEG C for 30-120min, heating to 260-300DEG C from 90-120DEG C at a rate of 3-10DEG C / min, carrying out heat insulation at 260-300DEG C for 30-120min, heating to 370-390DEG C from 260-300DEG C at a rate of 2-8DEG C / min, and carrying out heat insulation at 370-390DEG C for 5-120min. The method well solves the problem of easy collapsing of fibers in the sintering process of a polytetrafluoroethylene precursor membrane, and allows the beaded ultrafine fiber netted membrane, disordered stacking between fibers becomes mutual adhesion, and the fibers have the characteristics of uniform form, complete surface, and greatly improved strength and toughness, and can bear a certain vacuum pressure.

Description

technical field [0001] 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 [0002] 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. [0003] At present, the biaxial stretching method is mostly used in the preparation of polytetrafluoroethylene porous membranes. When this method wants to obtain a film with a higher porosity, the film needs to be stretched at a large scale, the surface structure cannot be controlled, and the film thickness is only less than a dozen microns. Supporting materials are needed in...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D67/00
CPCB01D61/364B01D67/0002B01D69/02B01D71/36B01D2325/38
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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