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Polymer microporous modification by corona induced grafting technology

A technology of inducing grafting and grafting polymerization, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reducing membrane separation performance and mechanical strength, destroying the structure of membrane body, and difficult to continuous application. , to achieve the effect of broadening the scope of application, less damage, and reduced protein adsorption

Inactive Publication Date: 2006-08-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used polymer microporous membranes are mainly microporous membranes made of polyethylene, (PE), polypropylene (PP) or polyvinylidene fluoride (PVDF). These polymer materials are characterized by their strong Hydrophobicity, there are two key problems when it is used in the treatment of water media: one is that the hydrophobicity of the membrane makes water need a higher pressure to pass through the membrane, and the power consumption is high; the other is that the hydrophobicity of the membrane is easy to cause organic matter and Colloids (such as proteins) adsorb on the surface of the membrane and in the pores of the membrane to form membrane fouling, resulting in a decrease in the flux of the membrane
The surface graft modification method can make the polymer microporous membrane have durable hydrophilicity and antifouling properties, but the equipment for ozonation and low-temperature plasma treatment is complicated, the operation cost is high, and the safety is not good. It is difficult to achieve continuous application under negative pressure; while UV and high-energy particle irradiation treatment methods may cut off polymer molecular chains, destroy the bulk structure of the membrane, and reduce the separation performance and mechanical strength of the membrane.

Method used

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  • Polymer microporous modification by corona induced grafting technology
  • Polymer microporous modification by corona induced grafting technology
  • Polymer microporous modification by corona induced grafting technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056]20 lengths of 10cm polyethylene (PE) hollow fiber microporous membranes (average aperture 0.85 micron, developed by Hangzhou Zhejiang University Kaihua Membrane Technology Co., Ltd.) were weighed and fixed on the corona stand of the corona treater for processing. The conditions are: dry air filling rate 5L / min; treatment temperature 26°C (room temperature); corona power 0.5kW. The treated PE hollow fiber membrane was immersed in an aqueous solution of acrylic acid (AA), and grafted at 30°C. During the reaction, N 2 Deoxygenation. When the set reaction time is reached, the PE hollow fiber is taken out, and the membrane is repeatedly ultrasonically soaked and cleaned with 20°C pure water and ethanol for 24 hours to remove unreacted monomers and homopolymers, and then weighed after vacuum drying at 60°C for 24 hours. weight and representation.

[0057] The scanning electron microscope (SEM) photos of the outer surface morphology of PE hollow fiber microporous membranes be...

Embodiment 2

[0060] Cut, wash and dry polypropylene (PP) flat microporous membrane (average pore size 0.22 micron, produced by Membrana, Germany) 4 × 8cm 2 , corona treatment after weighing, the treatment conditions are: dry air filling rate 30L / min; treatment temperature 10 ℃ (room temperature); discharge voltage 2.0kW. The film after corona treatment was immersed in the ethanol solution of propylene acetate, and the grafting reaction was carried out at 70 ° C. During the reaction, nitrogen saturated with water vapor was continuously passed into the reaction solution. 2 . When the set reaction time is reached, the PP flat film is soaked in 2.0wt% sodium hydroxide aqueous solution at 40°C for 3 hours, 1.5wt% hydrochloric acid aqueous solution at 30°C for 2 hours, and then soaked in water at 60°C for 48 hours. Then carry out with water, after vacuum drying at 10°C, carry out weighing and characterization.

[0061] The performance characterization data of the PP flat microporous membrane ...

Embodiment 3

[0064] 20 PP hollow fiber microporous membranes with a length of 10 cm (average pore size 0.15 micron, produced by Hangzhou Zheda Kaihua Membrane Technology Co., Ltd.) were cut and weighed after cleaning and drying. The corona treatment conditions were the same as in Example 1. The treated PP hollow fiber membrane was immersed in N-vinylpyrrolidone (NVP) aqueous solution, and grafted at 75 ° C. During the reaction, N 2 Deoxygenation. When the set reaction time is reached, the PP hollow fiber is taken out, and the membrane is repeatedly ultrasonically cleaned with pure water and ethanol to remove unreacted monomers and homopolymers, and then weighed and characterized after vacuum drying at 50°C for 24 hours .

[0065] The performance characterization data of the PP hollow fiber membrane and the original membrane reference substance after grafting NVP on the surface are shown in Table 3, and the SEM images of the outer surface morphology of the membrane before and after graftin...

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Abstract

A corona induced grafting method for modifying the millipore polymer membrane to improve its hydrophilicity, anti-pollution performance and biocompatibility includes such steps as corona treating of hydrophibic millipore polymer membrane for 15-120 S to generate the active centers on its surface for inducing polymerization, and immersing it in the hydrophilic olefinic monomer solution at 30-70 deg.C for 0.5-24 hr to form a hydrophilic layer on its surface.

Description

technical field [0001] The invention relates to a method for modifying a polymer separation membrane, and specifically provides a method for modifying a polymer microporous membrane by corona-induced grafting. Background technique [0002] Membrane separation technology is a new type of high-efficiency separation technology. Compared with traditional separation technologies, it has outstanding advantages such as high separation efficiency, low energy consumption (no phase change), and environmental friendliness. It is almost suitable for petrochemical / chemical, food / Separation, purification and resource recovery of liquid and gas media in various fields such as beverage, pharmaceutical / medical, dye, natural substance extraction and concentration, water purification and wastewater treatment. Due to the close relationship between membrane separation technology and energy saving, environmental protection, resource development and full utilization, the role of membrane technolo...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D67/00
Inventor 朱宝库朱利平徐又一
Owner ZHEJIANG UNIV
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