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Method for modifying irradiation of polyethylene hollow fiber microporous membrane

A technology of polyethylene and microporous membranes, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult industrialization, difficult continuous production, and low surface energy

Inactive Publication Date: 2012-08-29
四川久润环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main chain of polyethylene is linear long-chain methylene, with symmetrical structure, low surface energy, and difficult surface treatment. Researchers at home and abroad use plasma treatment or ozone activation to modify fibers. These methods require high equipment and are difficult. Realizing continuous production, industrialization is more difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: A bundle of pretreated polyethylene hollow fiber microporous membranes was soaked in 20wt% acrylic acid monomer solution for 2 hours, then taken out and sealed with polyethylene plastic film, filled with nitrogen for protection, and then placed in an electron accelerator Irradiation was carried out at a temperature of 50 kGY. After the irradiation, the polyethylene hollow fiber microporous membrane was taken out and washed with deionized water until the membrane was neutral. The contact angle of the prepared hydrophilic microporous membrane was 52°.

Embodiment 2

[0020] Example 2: A bundle of pretreated polyethylene hollow fiber microporous membranes was soaked in 15 wt% methacrylamide monomer solution for 2 hours, then taken out and sealed with polyethylene plastic film, filled with nitrogen for protection, and then Carry out irradiation under electron accelerator, irradiation dose is 40kGY, after irradiation finishes, take out polyethylene hollow fiber microporous membrane, wash with deionized water until membrane neutrality, the contact angle of prepared hydrophilic microporous membrane is 61°.

Embodiment 3

[0021] Embodiment 3: A bundle of pretreated polyethylene hollow fiber microporous membranes was soaked in 10wt% hydroxymethylethyl methacrylate monomer solution for 2 hours, then taken out and sealed with polyethylene plastic film, filled with nitrogen Protected, and then irradiated under the electron accelerator, the irradiation dose is 45kGY, after the irradiation is over, take out the polyethylene hollow fiber microporous membrane, wash it with deionized water until the membrane is neutral, and the prepared hydrophilic microporous The film contact angle was 47°.

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Abstract

The invention provides a method for modifying irradiation of a polyethylene hollow fiber microporous membrane. The method is characterized in that after the polyethylene hollow fiber microporous membrane is fully soaked in active monomer solution, membrane fibers which are processed by the active monomer solution are irradiated, a free radical is generated on the surface of the membrane, and a cross-linking and grafting reaction is generated, so that the polyethylene microporous membrane with high hydrophilcity is obtained. The surface water contact angle of the polyethylene hollow fiber microporous membrane after being irradiated is reduced, the hydrophilcity is obviously improved, and the prepared hollow fiber microporous membrane has stable performance.

Description

technical field [0001] The invention relates to a method for modifying the high hydrophilicity of a microporous filter membrane used in the field of liquid separation, and more specifically refers to a method for irradiation modification of a polyethylene hollow fiber microporous membrane. Background technique [0002] Polyethylene (PE) hollow fiber microporous membrane has high porosity, high mechanical strength, excellent chemical solvent resistance, bacterial erosion resistance and good biocompatibility, and the raw materials are cheap and easy to obtain, and the production process Simple, it is an ideal microporous membrane, which has stable performance and is not easy to degrade in long-term use in sewage treatment. However, because PE is a non-polar material with low surface energy, inertness and hydrophobicity, it has disadvantages such as poor water absorption, easy electrostatic charge, and poor pollution resistance when used as a sewage treatment material. In order...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D69/08B01D67/00
Inventor 田满红杨俊永黄卫东刘岩罗明仁李大海
Owner 四川久润环保科技有限公司
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