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Preparation method of polytetrafluoroethylene hollow fibrous membrane for membrane absorption

A polytetrafluoroethylene and fiber membrane technology, which is applied in the field of hollow fiber membrane preparation, can solve problems such as complex processes, and achieve the effects of high mass transfer coefficient, increased porosity, and high ammonia nitrogen removal rate

Inactive Publication Date: 2013-05-15
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires additional preparation of PTFE flat film or additional purchase, and at the same time requires the addition of special cutting equipment and wrapping equipment, the process is relatively complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mixing: Select polytetrafluoroethylene dispersed resin powder with a molecular weight of 10 million, mix polytetrafluoroethylene dispersed resin powder, liquid paraffin, and ethanol in a mass ratio of 1:0.2:0.01, and stand at 20°C for 100 hours, and then stand at 40°C for 20 hours to fully mix the polytetrafluoroethylene dispersed resin powder with liquid paraffin and ethanol to form a polytetrafluoroethylene material;

[0022] (2) Compacting: Press the polytetrafluoroethylene material on a compacting machine to form a cylindrical blank at room temperature;

[0023] (3) Extrusion: Extrude the cylindrical blank through a pusher at 40°C to form a polytetrafluoroethylene hollow tube at an extrusion speed of 300 cm / min;

[0024] (4) Longitudinal stretching: the polytetrafluoroethylene hollow tube is longitudinally stretched in an oven to form a polytetrafluoroethylene hollow fiber membrane, the stretching ratio is 0.5 times, and the oven temperature is 320°C;

[0025] ...

Embodiment 2

[0028] (1) Mixing: Select polytetrafluoroethylene dispersion resin powder with a molecular weight of 2 million, mix polytetrafluoroethylene dispersion resin powder, petroleum ether, and isopropanol in a mass ratio of 1:0.4:0.3, and statically place at 40°C Set aside for 60 hours, then stand at 80°C for 10 hours, fully mix the polytetrafluoroethylene dispersion resin powder with petroleum ether and isopropanol to form polytetrafluoroethylene materials;

[0029] (2) Compacting: Press the polytetrafluoroethylene material on a compacting machine to form a cylindrical blank at room temperature;

[0030] (3) Extrusion: Extrude the cylindrical blank through a pusher at 60°C to form a polytetrafluoroethylene hollow tube at a speed of 100 cm / min;

[0031] (4) Longitudinal stretching: the polytetrafluoroethylene hollow tube is longitudinally stretched in an oven to form a polytetrafluoroethylene hollow fiber membrane, the stretching ratio is 5 times, and the oven temperature is 250°C; ...

Embodiment 3

[0035] (1) Mixing: Select polytetrafluoroethylene dispersed resin powder with a molecular weight of 8 million, mix polytetrafluoroethylene dispersed resin powder, kerosene, and amyl alcohol in a mass ratio of 1:0.3:0.1, and stand at 30°C for 80 hours, and then stand at 60°C for 15 hours to fully mix the polytetrafluoroethylene dispersed resin powder with kerosene and amyl alcohol to form polytetrafluoroethylene materials;

[0036] (2) Compacting: Press the polytetrafluoroethylene material on a compacting machine to form a cylindrical blank at room temperature;

[0037] (3) Extrusion: Extrude the cylindrical blank through a pusher at 50°C to form a polytetrafluoroethylene hollow tube at an extrusion speed of 200 cm / min;

[0038] (4) Longitudinal stretching: the polytetrafluoroethylene hollow tube is longitudinally stretched in an oven to form a polytetrafluoroethylene hollow fiber membrane, the stretching ratio is 2 times, and the oven temperature is 300°C;

[0039] (5) Heat s...

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Abstract

The invention discloses a preparation method of a polytetrafluoroethylene hollow fibrous membrane for membrane absorption. The method comprises the following steps of: mixing polytetrafluoroethylene dispersed resin powder with an extrusion aid and an alcohol organic reagent; and performing compaction, extrusion, longitudinal stretching and heat setting to obtain the polytetrafluoroethylene hollow fibrous membrane for membrane absorption. According to the invention, the porosity of the prepared polytetrafluoroethylene hollow fibrous membrane can reach 60-95%, the average pore size is 0.2-1.0 micron, and the wall thickness is 0.2-1.0mm; and the polytetrafluoroethylene hollow fibrous membrane is mainly applied to a membrane absorption process and can be used for treating pollutants such as ammonia nitrogen, phenols and the like in wastewater.

Description

technical field [0001] The invention relates to a preparation method of a hollow fiber membrane, in particular to a preparation method of a polytetrafluoroethylene hollow fiber membrane for membrane absorption. Background technique [0002] With the rapid development of my country's economy, the ensuing environmental pollution problems are becoming more and more serious, especially water pollution. The "National Environmental Protection "Twelfth Five-Year" Plan" pointed out that "improving the quality of water environment" is one of the outstanding environmental problems that need to be solved. Our country has made the control of water pollution a top priority. [0003] Membrane absorption technology is a new type of membrane separation technology that combines traditional chemical absorption method and membrane separation technology. Different from the traditional membrane separation technology, the microporous membrane material only plays the role of isolating gas and ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D67/00B01D69/08C02F1/44
Inventor 唐红艳郭玉海朱海霖张华鹏
Owner ZHEJIANG SCI-TECH UNIV
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