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Preparation method of amphoteric polyether sulphone separation membrane

A polyethersulfone ultrafiltration membrane and polyethersulfone technology are used in the preparation of polymer separation membranes and the preparation of amphoteric polyethersulfone separation membranes. Difficult to control and other problems, to achieve the effects of easy control of the preparation process, improved hydrophilicity, and mild preparation conditions

Inactive Publication Date: 2013-08-28
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most modification methods are complicated to operate, the conditions are harsh, and the modification effect is difficult to control.
Conventional low-temperature plasma modification mainly has the disadvantage that the reaction result is difficult to control, but low-temperature plasma modification forms an ultra-thin, dense, firm, vacuum-free, and highly cross-linked modified layer on the surface of the polymer, which can significantly change the surface of the separation membrane. performance without affecting the thermal stability and mechanical properties of the material itself, and can realize reactions that cannot be realized by traditional chemical reactions. This aspect is an ideal polymer separation membrane modification technology

Method used

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  • Preparation method of amphoteric polyether sulphone separation membrane
  • Preparation method of amphoteric polyether sulphone separation membrane
  • Preparation method of amphoteric polyether sulphone separation membrane

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preparation example Construction

[0036] The preparation method of the amphoteric polyethersulfone separation membrane of the present invention is specifically implemented according to the following steps:

[0037] Step 1, take the polyethersulfone flat ultrafiltration membrane, remove the additives contained in the polyethersulfone flat ultrafiltration membrane, and obtain a clean polyethersulfone flat ultrafiltration membrane:

[0038] Step 1.1, take polyethersulfone flat ultrafiltration membrane, the polyethersulfone flat ultrafiltration membrane is a commercial product of Shenzhen Jiaquan Membrane Filtration Co., Ltd., with an average pore size of 0.2 μm;

[0039] Step 1.2, wash the polyethersulfone flat ultrafiltration membrane in step 1.1 with distilled water, wherein the amount of distilled water and polyethersulfone flat ultrafiltration membrane is: 50L / m 2 ~80L / m 2 , that is, 50L to 80L of distilled water should be added to each square meter of polyethersulfone flat ultrafiltration membrane;

[0040...

Embodiment 1

[0075] Take the polyethersulfone flat ultrafiltration membrane, wash the polyethersulfone flat ultrafiltration membrane with distilled water, add 50L of distilled water per square meter of polyethersulfone flat ultrafiltration membrane, and place the cleaned polyethersulfone flat ultrafiltration membrane in a vacuum In a drying oven, dry at room temperature for 11 hours to obtain a polyethersulfone flat ultrafiltration membrane, and weigh the quality of the polyethersulfone flat ultrafiltration membrane;

[0076] First place the cleaned polyethersulfone flat ultrafiltration membrane in the discharge reaction tube of the controllable low-temperature plasma discharge device, 20cm away from the discharge center, and then adjust the discharge parameters of the controllable low-temperature plasma discharge device. The discharge parameters are: The working gas is ammonia, the discharge power is 60W, and the gas flow rate is 20cm 3 / min, after adjusting the discharge parameters, star...

Embodiment 2

[0083] Take the polyethersulfone flat ultrafiltration membrane, clean the polyethersulfone flat ultrafiltration membrane with distilled water, add 55L of distilled water per square meter of polyethersulfone flat ultrafiltration membrane, and place the cleaned polyethersulfone flat ultrafiltration membrane in a vacuum In a drying oven, dry at room temperature for 12 hours to obtain a polyethersulfone flat ultrafiltration membrane, and weigh the quality of the polyethersulfone flat ultrafiltration membrane;

[0084] First place the cleaned polyethersulfone flat ultrafiltration membrane in the discharge reaction tube of the controllable low-temperature plasma discharge device, 40cm away from the discharge center, and then adjust the discharge parameters of the controllable low-temperature plasma discharge device. The discharge parameters are: The working gas is ammonia, the discharge power is 60W, and the gas flow rate is 20cm 3 / min, after adjusting the discharge parameters, sta...

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Abstract

The invention discloses a preparation method of an amphoteric polyether sulphone separation membrane. The preparation method specifically comprises the following steps of: 1, taking a polyether sulphone flat ultrafiltration membrane, and removing an additive contained in the polyether sulphone flat ultrafiltration membrane to obtain a clean polyether sulphone flat ultrafiltration membrane; 2, performing plasma modification on the polyether sulphone ultrafiltration membrane obtained in the step 1 by using a controllable low-temperature plasma discharge device to obtain a modified polyether sulphone ultrafiltration membrane; and 3, taking an acrylic monomer, and grafting the modified polyether sulphone ultrafiltration membrane with the acrylic monomer to obtain the amphoteric polyether sulphone separation membrane. The polyether sulphone separation membrane prepared by the preparation method is an amphoteric membrane of which the surface contains amine groups and carboxyl, and the surface hydrophilicity is enhanced, so that the pollution resistance of the membrane is improved; and while the retention rate is increased, the pure water flux is greatly improved, so that the filtration efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of separation membrane preparation methods, and relates to a preparation method of a polymer separation membrane, in particular to a preparation method of an amphoteric polyethersulfone separation membrane. Background technique [0002] Membrane separation technology is a molecular-level high-tech separation technology developed in recent years. It is widely used in medicine, sewage treatment, ultra-pure water and other industries. Especially in today's energy shortage, resource shortage, and ecological environment deterioration, membrane technology has been recognized. It is an extremely important new technology in the 21st century. [0003] The core of membrane separation technology is the separation membrane with separation function. From the perspective of material types, separation membranes can be divided into two categories: inorganic membranes and organic polymer membranes. The former is characteriz...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/78B01D71/82
Inventor 李茹
Owner XI'AN POLYTECHNIC UNIVERSITY
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