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Hydrophilic anti-pollution polyether sulfone hollow fiber ultrafiltration membrane and preparation process thereof

A preparation process, polyether sulfone technology, applied in the field of hollow fiber ultrafiltration membrane of polymer materials, can solve the problems of high operating pressure, ultrafiltration membrane pollution, high cleaning frequency, etc., achieve high water flux, good dispersion performance, anti highly polluting effect

Inactive Publication Date: 2014-03-26
JIANGSU MAYMUSE ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Therefore, the purpose of the present invention is to provide a high water flux and strong anti-pollution ultrafiltration membrane in order to overcome the problems of existing ultrafiltration membranes, which are easily polluted by organic matter such as colloid, oil, protein, etc., difficult to clean, high in cleaning frequency, and high in operating pressure. filter membrane; meanwhile, another object of the present invention is to provide the preparation technology of this polyethersulfone hollow fiber ultrafiltration membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of nano-scale titanium dioxide modified by silicon-alumina binary composite coating:

[0016] TiO 2 A dispersant sodium silicate is added to the 25% slurry, and the pH of the solution is adjusted to 8.5 for pre-dispersion. At 85 °C, the stoichiometry of sodium silicate is controlled at SiO 2 / TiO 2 =2%, adjust the pH of the solution to 7 with sodium silicate, and age to complete the silicon-coated film. On the basis of the silicon-coated film, maintain the temperature at 65°C, pH=8.5, add aluminum sulfate and dilute sodium hydroxide, control the stoichiometry of aluminum sulfate at Al2O3 / TiO=3%, adjust the pH of the slurry to 7.0 with aluminum sulfate Aged, washed to no SO 4 2- , filtered, and dried at 200°C to obtain silica-aluminum binary coated titanium dioxide.

[0017] (2) Preparation of spinning solution

[0018] Add 28% polyethersulfone, 14% polyethylene glycol, and 58% N,N-dimethylacetamide into the spinning kettle in a certain order, and ...

Embodiment 2

[0024] The content of the silicon-aluminum binary composite coating modified nano-scale titanium dioxide is reduced from 1.5% to 1.00% of the total amount of the casting solution, and the rest are the same as in Example 1. The prepared fiber membrane was characterized, and its main performance parameters were: the outer diameter of the polyethersulfone hollow fiber ultrafiltration membrane was 0.30 mm, the inner diameter was 0.10 mm, and the pore diameter was 0.008 μm. The rejection rate of polyethylene glycol with a molecular weight of 10,000 Daltons is 79%, the contact angle is 55°, and the pure water flux at 25°C and 0.1MPa is 398L / m 2 h, the tensile strength is 0.45MPa, the bacteriostatic rate to Staphylococcus aureus is 86.80%, and the bacteriostatic rate to Escherichia coli is 85.00%.

Embodiment 3

[0026] The dry spinning course of 10cm is raised to 15cm, all the other are with embodiment 1. The prepared fiber membrane was characterized, and its main performance parameters were: the outer diameter of the polyethersulfone hollow fiber ultrafiltration membrane was 0.3 mm, the inner diameter was 0.1 mm, and the pore diameter was 0.005 μm. The rejection rate of polyethylene glycol with a molecular weight of 10,000 Daltons is 83%, the contact angle is 45°, and the pure water flux at 25°C and 0.1MPa is 430L / m 2 h, the tensile strength is 0.52MPa, the bacteriostatic rate to Staphylococcus aureus is 87.80%, and the bacteriostatic rate to Escherichia coli is 86.00%.

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Abstract

The invention relates to a hydrophilic anti-pollution polyether sulfone hollow fiber ultrafiltration membrane and a preparation process thereof. The membrane is prepared from a polyether sulfone membrane casting liquid by using a nonsolvent phase separation method in a spinning mode, wherein the polyether sulfone membrane casting liquid comprises the following components by weight: a, an initial membrane casting liquid which comprises 10-30% of polyether sulfone resin, 40-60% of polar solvent and 5-20% of additive; b, aluminum silicon binary composite wrapping modified nanoscale titanium dioxide which accounts for 0.05-2% of the initial membrane casting liquid. The nano titanium dioxide which is subjected to surface modification is good in dispersity in the membrane casting liquid, agglomeration is not easy to happen, the prepared ultrafiltration membrane is high in water flux and high in pollution prevention performance, the operation pressure and the chemical washing frequency of the ultrafiltration membrane in an application condition are greatly reduced, and the membrane has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of polymer hollow fiber ultrafiltration membranes, and provides a hydrophilic and anti-pollution polyethersulfone hollow fiber ultrafiltration membrane and a preparation process thereof. Background technique [0002] Polyethersulfone is a polymer material with excellent comprehensive properties. It has good chemical stability, acid and alkali resistance, heat resistance and aging resistance. It is used in ultrafiltration, microfiltration, reverse osmosis, gas separation, alcohol It has been widely used in water separation, olefin / alkane separation, immobilized carrier, hemodialysis and so on. However, due to the strong hydrophobicity of the surface of the polyethersulfone membrane material, it is easy to generate adsorption and deposition on the surface of the membrane, which will block the membrane pores, cause membrane pollution, reduce the performance of the membrane, and shorten the service life. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/08B01D69/02B01D67/00
Inventor 沈敏张亦含刘芬芬赵晓画
Owner JIANGSU MAYMUSE ENVIRONMENTAL TECH CO LTD
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