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PTFE hollow fiber film used for bubbleless aeration oxygenation, and preparation method thereof

A non-foam aeration, PTFE technology, applied in water aeration, chemical instruments and methods, membrane technology, etc., can solve the problems of single use, low porosity, high cost, easy operation, high porosity, resistance small effect

Inactive Publication Date: 2017-05-10
SINOMA SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defects of single use mode, high cost, large pore size, low porosity, and low strength when PTFE hollow fiber membranes are used for sewage treatment in the prior art, the present invention provides a PTFE membrane for bubble-free aeration and oxygenation. Hollow fiber membrane and its preparation method

Method used

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  • PTFE hollow fiber film used for bubbleless aeration oxygenation, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method for bubble-free aeration and oxygenation PTFE hollow fiber membrane, comprising the steps of:

[0025] 1) Take polytetrafluoroethylene powder (Chenguang 216G) with a mass ratio of 82% and 18% paraffin oil in a "V"-shaped mixer and mix evenly, then age at 45°C for 18 hours;

[0026] 2) Put the mixture into a blanking machine, punch it under a pressure of 1000KG, take it out after holding the pressure for 5 minutes, put it into a pusher, and push it under a pressure of 1000KG to form a nascent PTFE hollow fiber membrane;

[0027] 3) Deoiling the obtained nascent PTFE hollow fiber membrane in a deoiler at 120° C. for 5 minutes in sequence;

[0028] 4) After deoiling, the PTFE hollow fiber membrane is stretched 5 times in the axial direction at 260°C in the stretching machine, and the stretching rate is 20m / min;

[0029] 5) After the stretching is completed, enter the sintering furnace at 380°C for sintering at a vehicle speed of 20m / min, and prepare a...

Embodiment 2

[0031] A preparation method for bubble-free aeration and oxygenation PTFE hollow fiber membrane, comprising the steps of:

[0032] 1) Take polytetrafluoroethylene powder (Chenguang 216G) with a mass ratio of 75%, and 25% white oil, put them in a "V"-shaped mixer, mix them evenly, and age them at 45°C for 18 hours;

[0033] 2) Put the mixture into a blanking machine, punch it under a pressure of 1000KG, take it out after holding the pressure for 15 minutes, put it into a pusher, and push it under a pressure of 1400KG to form a nascent PTFE hollow fiber membrane;

[0034] 3) The nascent PTFE hollow fiber membranes are deoiled at 180°C for 0.2min in the deoiler in turn;

[0035] 4) After deoiling, the PTFE hollow fiber membrane is stretched 8 times in the axial direction at 320°C in a stretching machine, and the stretching rate is 1m / min;

[0036] 5) After the stretching is completed, enter the sintering furnace at 400°C for sintering at a vehicle speed of 1m / min, and prepare a ...

Embodiment 3

[0038] A preparation method for bubble-free aeration and oxygenation PTFE hollow fiber membrane, comprising the steps of:

[0039] 1) Take polytetrafluoroethylene powder (Daikin F104) with a mass ratio of 75% and 25% kerosene in a "V"-shaped mixer and mix evenly, then age at 45°C for 18 hours;

[0040] 2) Put the mixture into the blanking machine, punch it under a pressure of 1400KG, take it out after keeping the pressure for 5 minutes, put it into a pushing machine, and push it under a pressure of 1400KG to form a nascent PTFE hollow fiber membrane;

[0041] 3) The nascent PTFE hollow fiber membranes are deoiled in a deoiler at 120°C for 3 minutes in sequence;

[0042] 4) After deoiling, the PTFE hollow fiber membrane is stretched 5 times in the axial direction at 420°C in the stretching machine, and the stretching rate is 30m / min;

[0043] 5) After the stretching is completed, enter the sintering furnace at 420°C for sintering at a speed of 40m / min, and prepare a PTFE hollo...

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Abstract

The invention discloses a PTFE hollow fiber film used for bubbleless aeration oxygenation, and a preparation method thereof. According to the PTFE hollow fiber film used for bubbleless aeration oxygenation, a hollow tubular structure is adopted, micropores with an average pore diameter ranging from 1000 to 8000nm are uniformly distributed on the surface layer and the interior; and the porosity of the micropores ranges from 70 to 90%. The PTFE hollow fiber film is low in pore diameter, high in porosity and strength, and excellent in physical and chemical properties, is especially suitable for bubbleless aeration oxygenation; aeration resistance is low; operation is stable and reliable; adaptability is high; the PTFE hollow fiber film is suitable for aeration of a plurality of waste water; oxygen utilization rate is high; generated micron order bubbles are small and uniform; service life is long; no film pollution is caused; film washing is not needed in long term of application; the preparation method is simple; no environment pollution is caused; operation is convenient; and the preparation method is suitable for industrialized production.

Description

technical field [0001] The invention relates to a PTFE hollow fiber membrane used for bubble-free aeration and oxygen enhancement and a preparation method thereof, belonging to the field of PTFE water treatment membranes. Background technique [0002] Polytetrafluoroethylene (PTFE) is a special engineering plastic with excellent comprehensive properties, and has the reputation of "King of Plastics". PTFE material has excellent acid and alkali resistance, chemical corrosion resistance and excellent non-stickiness. It is suitable for the treatment of various sewage and wastewater in the field of water treatment. [0003] At present, the PTFE hollow fiber membranes that have been commercialized at home and abroad are mainly monopolized by Gore of the United States (US Patent Publication No.: US3953566A) and Japan’s Sumitomo Corporation (US Patent Publication No.: US4049589A). The PTFE hollow fiber membranes prepared by these two companies Using the wrapping preparation process...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D69/08B01D69/02B01D67/00C02F7/00
CPCB01D67/0025B01D69/02B01D69/08B01D71/36C02F7/00Y02W10/10
Inventor 黎鹏范凌云余佳彬郭晓蓓方岩张振费传军
Owner SINOMA SCI & TECH
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