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A kind of preparation method of polytetrafluoroethylene superhydrophobic film

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 effect of fiber shape and surface integrity, strength and toughness

Active Publication Date: 2019-05-14
四川百途环保材料科技有限公司 +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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  • A kind of preparation method of polytetrafluoroethylene superhydrophobic film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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, the heating rate is 7°C / min from room temperature to 140°C, the temperature is kept at 140°C for 80min, and from 140°C Raise the temperature to 373°C with a heating rate of 8°C / min. After reaching the sintering temperature, that is, the temperature of the sintering section is 373°C and hold for 100 minutes.

[0029] Cooling: Under a flowing atmosphere of nitrogen, cool down from 373°C to 180°C at a rate of 8°C / min, keep at 180°C for 80 minutes, and then cool naturally.

[0030] After cooling, tak...

Embodiment 2

[0032] 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. Wound onto a cylindrical support mold with a diameter of 5 cm, wound 5 layers, and sent to a tube furnace for ventilation. The temperature of the sintering process was controlled by a program. ℃ to 390 ℃, the heating rate is 6 ℃ / min, after reaching the sintering temperature, that is, the temperature of the sintering section is 392 ℃, and the temperature is kept for 10 minutes.

[0033] Cooling: Under the flowing atmosphere of air, cool down from 390°C to 200°C at a rate of 15°C / min, keep at 200°C for 30 minutes, and then cool naturally.

[0034] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thickness of 220um...

Embodiment 3

[0036] 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. Raise the temperature to 376°C, and the heating rate is 3°C / min. After reaching the sintering temperature, the temperature of the sintering section is 376°C, and hold for 80 minutes.

[0037] Cooling: Under a flowing nitrogen atmosphere, cool down from 376°C to 190°C at a rate of 5°C / min, keep at 190°C for 40 minutes, and then cool naturally.

[0038] After cooling, take it out and pull out the cylindrical support mold to obtain a cylindrical polytetrafluoroethylene membrane with a thickness of 195...

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Abstract

The invention provides a preparation method of a polytetrafluoroethylene film. The preparation method comprises the steps of preparing a spinning solution, preparing fibers and sintering and is characterized by adding polytetrafluoroethylene emulsion after preparing a solution with a fiber forming carrier and a solvent, wherein the fiber forming carrier is gelatin, and the solvent is water; adopting multistep continuous sintering through program temperature control, and in flowing atmospheres, increasing the temperature from a room temperature to 120-200 DEG C at a rate of 3-10 DEG C / min and insulating at 120-200 DEG C for 30-120 minutes; increasing the temperature from 120-200 DEG C to 360-400 DEG C at a rate of 2-8 DEG C / min and insulating at 360-400 DEG C for 5-120 minutes; carrying out cooling treatment after sintering: in the flowing atmospheres, reducing the temperature from 360-400 DEG C to 150-200 DEG C at a rate of 3-15 DEG C / min, insulating at 150-200 DEG C for 30-120 minutes and then carrying out natural cooling. The preparation method has the beneficial effects that the polytetrafluoroethylene film with bead-like superfine fibers is prepared and a hydrophobic surface with a multistage coarse structure is formed together; the surface water contact angle is not less than 150 degrees and the porosity is higher than 80%; the problem that fibers are easy to collapse during sintering of a polytetrafluoroethylene precursor film is solved; the fibers have intact morphologies and surfaces and greatly improved strength and tenacity 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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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D69/02B01D67/00
Inventor 姚永毅钟丕叶雷
Owner 四川百途环保材料科技有限公司
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