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Preparation method for tubular membrane of PI(polyimide) non-woven supporting tube

A technology of non-woven fabrics and support tubes, applied in the field of tubular membrane preparation, can solve the problems of roll-type membranes and hollow fiber membranes, such as application limitations, flux decline, and easy clogging, and achieve large flux, narrow pore size distribution, good filter effect

Inactive Publication Date: 2018-11-23
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practical applications, they have very high requirements for the pretreatment of the feed liquid, otherwise it will cause easy clogging, a sharp drop in flux, and serious irreversible repairs, resulting in scrapping
For high solid content and high concentration liquid treatment, the application of roll membrane and hollow fiber membrane is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) High molecular polymer polyvinylidene fluoride, porogen polyvinylpyrrolidone and alcohol small molecule additives are mixed according to the mass ratio of 10:5:1, stirred at 110°C for 24h, and left standing at 60°C for 10h to obtain Casting solution. Within this ratio range, a flux of 500L / m can be prepared 2 / h, tubular membrane products with a molecular weight cut-off of 20,000;

[0024] (2) Cut the PI non-woven fabric into small strips with the same width of 8-30mm, send it to the central rod at an angle of 30° with the feeding device, and perform spiral winding on the central rod at a speed of 5m / min. The winding side is welded with an ultrasonic welding head, and the welding temperature is controlled at 405°C to make the PI nonwoven roll into a tubular shape. The tubes made at this welding temperature can ensure uniform welding, and there will be no weak or over-welded places, which can avoid the bursting of the membrane tube during high-pressure operation. ...

Embodiment 2

[0028] (1) High molecular polymer (can be polysulfone, polyethersulfone, polyvinylidene fluoride, polyamide, polyolefin, etc.), porogen (can be polyethylene glycol, polyvinylpyrrolidone or polyvinyl alcohol, etc.) Mix with small molecule additives (alcohols, inorganic salts or polar small molecules) according to the mass ratio of 20:10:8, stir at 110°C for 24h, and stand at 60°C for defoaming for 12h to obtain a casting solution. Within this ratio range, a flux of 1200L / m can be prepared 2 / h, tubular membrane products with a molecular weight cut-off of 50,000;

[0029] (2) Cut the PI non-woven fabric into small strips with the same width of 15mm, send it to the central rod at an angle of 45° with a feeding device, and perform spiral winding on the central rod at a speed of 10m / min, while winding Use an ultrasonic welding head to weld, control the welding temperature to 410 ° C, and make the PI nonwoven roll into a tube. The tubes made at this welding temperature can ensure ...

Embodiment 3

[0033] (1) High molecular polymer (can be polysulfone, polyethersulfone, polyvinylidene fluoride, polyamide, polyolefin, etc.), porogen (can be polyethylene glycol, polyvinylpyrrolidone or polyvinyl alcohol, etc.) Mix with small molecular additives (alcohols, inorganic salts or polar small molecules) according to the mass ratio of 40:25:15, stir at 110°C for 24h, and stand at 60°C for defoaming for 24h to obtain a casting solution. Within this ratio range, a flux of 2800L / m can be prepared 2 / h, serialized tubular membrane products with a molecular weight cut-off ranging from 150,000;

[0034] (2) Cut the PI non-woven fabric into small strips with the same width of 25mm, send it to the central rod at an angle of 60° with a feeding device, and perform spiral winding on the central rod at a speed of 15m / min, while winding Use an ultrasonic welding head to weld, control the welding temperature to 410 ° C, and make the PI nonwoven roll into a tube. The tubes made at this welding...

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Abstract

The invention relates to the field of separation membrane preparation, in particular to a preparation method for a tubular membrane of a PI(polyimide) non-woven supporting tube. The method comprises the steps of preparing a membrane casting solution, winding the PI(polyimide) non-woven tube, carrying out scrape coating on the membrane casting solution and carrying out post-treatment on the tube coated with the membrane. The prepared tubular membrane has good high-temperature resistance, low-temperature resistance, chemical corrosion resistance and tensile resistance and can be applied to the fields of water treatment and material separation; due to the heat resistance and the organic solvent resistance of PI(polyimide), the tubular membrane of the PI(polyimide) non-woven supporting tube has great significance in separation of high-temperature and organic liquid; and for some special high-temperature and low-temperature feed liquid, the organic solvent separation effect is good, and thegood performance can be kept for the long-term use.

Description

technical field [0001] The invention belongs to the field of separation membrane manufacturing, and in particular relates to a method for preparing a tubular membrane of a PI nonwoven fabric support tube. technical background [0002] At present, due to its complex assembly and high energy consumption, flat membranes have been gradually eliminated in the field of water treatment. Rolled membranes and hollow fiber membranes are mainly used for seawater desalination, brackish water desalination, pure water, and ultrapure water preparation. In practical applications, they have very high requirements for the pretreatment of the feed liquid, otherwise it will cause easy clogging, a sharp drop in flux, and serious irreversible repairs, resulting in scrapping. For high solid content and high concentration liquid treatment, the application of roll membrane and hollow fiber membrane is limited. [0003] The advantages of the tubular membrane are: (1) the service life of the tubular ...

Claims

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Application Information

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IPC IPC(8): B01D69/04B01D69/10B01D71/64B01D67/00C02F1/44
Inventor 程博闻刘恩华康卫民庄旭品鞠敬鸽厉宗洁
Owner TIANJIN POLYTECHNIC UNIV
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