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High-strength and hydrophilic polysulfone hollow fiber ultrafiltration membrane

A technology of ultrafiltration membrane and polysulfone, which is applied in the field of polysulfone ultrafiltration membrane and its manufacturing, and can solve the problems of complex spinning process, low strength of hollow fiber membrane and low hydrophilicity

Inactive Publication Date: 2012-03-21
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of improving the strength of the membrane is mainly to add reinforcing fibers, and the spinning process is relatively complicated.
[0009] In order to overcome the disadvantages of low strength and low hydrophilicity of polysulfone hollow fiber membranes, the current market urgently needs to develop a hollow fiber membrane with good hydrophilicity and high strength, and from an economic point of view, it is expected that the preparation process is relatively simple, Easy to operate and reduce costs

Method used

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  • High-strength and hydrophilic polysulfone hollow fiber ultrafiltration membrane
  • High-strength and hydrophilic polysulfone hollow fiber ultrafiltration membrane
  • High-strength and hydrophilic polysulfone hollow fiber ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The formula of casting solution is: PES 18%, PVP 8%, PEG600 2%, acetone 1%, and the rest is N,N-dimethylacetamide (DMAC). Add various raw materials into a three-necked flask equipped with a stirrer and a thermometer, swell at 40°C for 2 hours, then increase the temperature to 70°C and continue stirring for 20 hours to prepare a homogeneous and stable polymer mixed solution. Filter and defoam, and the prepared spinning dope shall be allowed to stand for at least 24 hours before use.

[0055] Spinning conditions are shown in Table 2. The spinneret is a three-hole spinneret. The extrusion speed of the spinning solution is 17g·min -1 , The core fluid flow rate is 5g·min -1 ; The nascent hollow fiber undergoes a 5cm dry spinning process and undergoes phase transformation in a coagulation bath at 45°C to form a hollow fiber membrane; then it is collected by the godet wheel at a speed of 2.7r·min -1 .

[0056] Table 2 Operating conditions of Example 1

[0057]

[0058] The core li...

Embodiment 1

[0059] The cross-sectional structure of the three-porous membrane obtained in Example 1 is attached Figure 4 .

[0060] The main performance parameters of the membrane are: the membrane has a pure water flux of 94L·m at 0.1MPa -2 ·H -1 , The rejection rate for polyethylene glycol with a molecular weight of 20kD reaches more than 90%, the contact angle is 64°, and the breaking strength and burst strength reach 7.85N and 0.50MPa respectively.

Embodiment 2

[0070] The casting liquid formula is: PES 14%, PVP 8%, FeCl 3 3%, lithium chloride (LiCl) 4%, PEG6002%, soil temperature 202%, the rest is N,N-dimethylacetamide (DMAC). Using a three-hole spinneret, spinning conditions and membrane performance parameters are shown in Table 4.

[0071] Table 4 Spinning conditions and membrane performance parameters of Example 2

[0072]

[0073] Compared with the first embodiment, the second embodiment is characterized in that under the condition of low polyethersulfone content, the method of adding lithium chloride is used to change the viscosity of the casting solution and improve the spinnability of the casting solution; at the same time, FeCl is added 3 , Through FeCl 3 The complex reaction with PVP modifies the polyethersulfone membrane to improve the hydrophilic properties of the membrane. Surface active agent soil temperature 20 can increase FeCl 3 The solubility.

[0074] It can be seen from Table 4 that the membrane has a pure water flux of...

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Abstract

The invention discloses a high-strength and hydrophilic polysulfone hollow fibre ultrafiltration membrane, belonging to the technical field of membranes. The invention is characterized in that: complex reaction between a soluble polymer and inorganic ions is utilized to improve the hydrophilicity of the membrane by adding a water-soluble polymer of metallic compound complex into a polysulfone material; the strength of the membrane is improved by preparing a hollow fibre membrane with spinning equipment, especially adopting a porous spinning jet to prepare a porous hollow fibre membrane which has a plurality of mutual-supporting porous channels; and the spinnability of the casting solution is improved by adding an auxiliary additive to produce a series of hollow fibre ultrafiltration membranes with different molecular weight cut-off (MWCO)s, satisfying various demands and having wide application scope. The preparing technology of the invention is simple to carry out industrialization production, thereby having good application prospect. The preparing technology of the invention is simple to carry out industrialization production, thereby having good application prospect.

Description

Technical field [0001] The invention relates to a polysulfone ultrafiltration membrane and a manufacturing method thereof, in particular to a high-strength, hydrophilic polysulfone ultrafiltration membrane and a manufacturing method thereof. The invention belongs to the field of membrane technology, Background technique [0002] Polysulfone (PS) and polyethersulfone (PES) are commonly used membrane materials. Polysulfone (PS) and polyethersulfone (PES) membranes are widely used in industrial applications. Since polysulfone materials are not very hydrophilic, many studies have been conducted on hydrophilic modification of polysulfone materials. [0003] Some researchers have carried out hydrophilic modification through surface modification. For example, the Chinese patent (ZL03129934.2) is to coat modified substances such as aldehyde, acid, or isocyanate on the membrane, and then heat the coated substance to further react with the hollow fiber membrane to provide modified fiber m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/08B01D67/00
Inventor 张浩勤白雪张允飞孙龙祥张翔张亚涛刘金盾
Owner ZHENGZHOU UNIV
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