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A kind of processing method of ptfe hollow fiber membrane

A processing method, PTFE technology, applied in the direction of chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high temperature resistance that cannot meet the use requirements of membrane filaments, secondary damage to membrane filaments, limited organic materials, etc., to achieve Guaranteed flexibility and chemical stability, less destructive effect, and small heating zone

Active Publication Date: 2022-07-29
NINGBO JINGYUAN MEMBRANE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, because the method of document 103949165A adopts the heating method of high-temperature blast, the supporting sleeve used in this method must be able to withstand high temperature. Since the high-temperature-resistant inorganic cannot meet the requirements for the long-term aeration and disturbance of the membrane filament, it is necessary to choose an organic material as the support sleeve, which makes the choice of organic materials in the preparation of hollow fiber cotton limited and expensive
Secondly, the method of document 103949165A adopts the method of multi-section independent high-temperature blast heating to ensure the bonding strength of the product. Between multiple independent heating sections, multiple ceramic guide wheels are needed to transmit the film filaments, and those directly in contact with the guide wheels It is an important factor for product defects (physical contact in the high temperature range is likely to cause irreversible damage to the membrane filaments above the glass transition temperature)
Furthermore, the method of document 103949165A must strengthen the blowing intensity in order to transfer the heat of the heating tube chamber to the membrane filament heating chamber and reduce the axial and tangential temperature gradients to ensure temperature uniformity. However, the high blowing intensity It is also easy to cause secondary damage to the membrane filament

Method used

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  • A kind of processing method of ptfe hollow fiber membrane
  • A kind of processing method of ptfe hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] In the present embodiment, the processing method of the PTFE hollow fiber membrane comprises the following steps:

[0049] (1) Pretreatment: Use ethanol and isopropanol to soak the PTFE original film, and then perform blast heating treatment on the soaked PTFE original film. The temperature of the blast heating treatment is 50°C, and the heating time is 6h. The viscosity of the PTFE membrane after the blast heating treatment is tested. If the viscosity index is qualified, it will go to the next process. If the viscosity index is unqualified, the soaking treatment will be performed again.

[0050] (2) The PTFE original film that has passed the viscosity test after pretreatment is cut into strips and wrapped around a polyester hollow braided fiber tube to form a long fiber film filament with a diameter of 2.1 mm.

[0051] (3) in the circulating blast chamber, insert the carbon powder rod into the isopropanol solvent, so that the carbon powder is dispersed in the isopropan...

Embodiment 2

[0056] In the present embodiment, the processing method of the PTFE hollow fiber membrane comprises the following steps:

[0057] (1) Pretreatment: Use ethanol and isopropanol to soak the PTFE original film, and then perform blast heating treatment on the soaked PTFE original film. The temperature of the blast heating treatment is 50°C, and the heating time is 6h. The viscosity of the PTFE membrane after the blast heating treatment is tested. If the viscosity index is qualified, it will go to the next process. If the viscosity index is unqualified, the soaking treatment will be performed again.

[0058] (2) The PTFE original membrane that has passed the viscosity test after pretreatment is wrapped into strips and wrapped around the polyester hollow braided fiber tube to form long fiber membrane filaments with a diameter of 2.1 mm.

[0059] (3) The conductive material silver is attached to the surface of the film wire by ion sputtering in a vacuum environment. The process param...

Embodiment 3

[0062] In the present embodiment, the processing method of the PTFE hollow fiber membrane comprises the following steps:

[0063] (1) Pretreatment: Use ethanol and isopropanol to soak the PTFE original film, and then perform blast heating treatment on the soaked PTFE original film. The temperature of the blast heating treatment is 50°C, and the heating time is 6h. The viscosity of the PTFE membrane after the blast heating treatment is tested. If the viscosity index is qualified, it will go to the next process. If the viscosity index is unqualified, the soaking treatment will be performed again.

[0064] (2) The PTFE original film that has passed the viscosity test after pretreatment is cut into strips and wrapped around a polyester hollow braided fiber tube to form a long fiber film filament with a diameter of 2.1 mm.

[0065] (3) Directly pass the membrane wire through a graphite hollow tube heated by a high-frequency induction coil at a speed of 300mm / s. The induction heatin...

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Abstract

The invention relates to a processing method of a PTFE hollow fiber membrane, belonging to the technical field of hollow fiber membrane processing. The processing method of the PTFE hollow fiber membrane of the present invention includes the following steps: pretreating the PTFE original membrane; wrapping the pretreated PTFE original membrane on a braided tube to form a wound long fiber membrane filament; The wire is subjected to high-frequency induction heating treatment; the heated membrane wire is subjected to post-treatment to obtain the finished product. Compared with the traditional blast heating method, the preparation method of the present invention can significantly reduce the energy consumption, and can adopt cheap materials that are not resistant to high temperature as the supporting material, thereby reducing the cost significantly.

Description

technical field [0001] The invention belongs to the technical field of hollow fiber membrane processing, and particularly relates to a processing method of a PTFE hollow fiber membrane. Background technique [0002] At present, the common hollow fiber membranes are mainly prepared by wet method and thermal method. The materials include PS, PES, PVDF, PVC, PP, etc., but the hollow fiber membranes of these materials have low porosity, low flux and insufficient strength. , The service life is not long, and it cannot be used in extreme environments such as strong acid, strong alkali and strong oxidation. Polytetrafluoroethylene (PTFE) has a symmetrical chemical structure, stable crystal form, and extremely high porosity. When used in hollow fiber membranes, it can overcome various defects of the above materials, and has long life, strong anti-pollution performance, and high flux. High recoverability. [0003] The patent application document of Publication No. 103949165A (the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D69/08B01D69/10B01D67/00
CPCB01D71/36B01D69/08B01D69/10B01D67/0002
Inventor 吴低潮王鑫臻黄江益
Owner NINGBO JINGYUAN MEMBRANE TECH
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