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High-strength and hydrophilic polysulfone hollow fiber ultrafiltration membrane

An ultrafiltration membrane, high-strength technology, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of complex spinning process, low strength of hollow fiber membrane, low hydrophilicity, etc.

Inactive Publication Date: 2010-06-09
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 the 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 with a stirrer and a thermometer, swell at 40°C for 2 hours, then raise the temperature to 70°C and continue stirring for 20 hours to prepare a uniform and stable polymer mixed solution, and then carry out Filtration, defoaming, and the prepared spinning stock solution was left to stand for at least 24 hours before use.

[0055] The spinning conditions are shown in Table 2. The spinneret is a three-hole spinneret. The extrusion speed of spinning solution is 17g·min -1 , the flow rate of core fluid is 5g·min -1 ; After a 5cm dry spinning process, the nascent hollow fiber undergoes phase inversion 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] The operating condition of table 2 embodiment one

[0057...

Embodiment 1

[0059] The cross-sectional structure of embodiment 1 gained three-hole membrane sees attached Figure 4 .

[0060] The main performance parameters of the membrane are: the pure water flux of the membrane is 94L m at 0.1MPa -2 h -1 , the rejection rate of polyethylene glycol with a molecular weight of 20kD is over 90%, the contact angle is 64°, and the breaking force and bursting strength are respectively 7.85N and 0.50MPa.

Embodiment 2

[0070] The casting solution formula is: PES 14%, PVP 8%, FeCl 3 3%, lithium chloride (LiCl) 4%, PEG6002%, soil temperature 20 2%, and the rest is N, N-dimethylacetamide (DMAC). A three-hole spinneret was used, and the spinning conditions and membrane performance parameters are shown in Table 4.

[0071] Spinning conditions and membrane performance parameters of the second embodiment of table 4

[0072]

[0073] Compared with Example 1, the feature of Example 2 is that under the condition of very 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, adding FeCl 3 , through FeCl 3 The complexation reaction with PVP modifies the polyethersulfone membrane to improve the hydrophilic performance of the membrane. Surfactant TWen 20 can increase FeCl 3 solubility.

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

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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, and polysulfone (PS) and polyethersulfone (PES) membranes are widely used in industry. Since the hydrophilicity of polysulfone materials is not very good, there are many researches on the hydrophilic modification of polysulfone materials. [0003] Some researchers have carried out hydrophilic modification by surface modification. For example, the Chinese patent (ZL03129934.2) provides modified fibers by coating modified substances such as aldehydes, acids, or isocyanates on the membrane, and then heating the coated substances and hollow fiber membranes. membrane. Ch...

Claims

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Application Information

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Patent Type & Authority Applications(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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