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Hydrophilic modified method of amphipathic molecule for semi-crystalline polyolefin porous membrane surface

An amphiphilic molecule and molecule-half technology, which is applied in the field of hydrophilic modification of the surface of semi-crystalline polyolefin porous membrane, can solve the problems of unsatisfactory reproducibility of results and sensitivity of polyethylene glycol molecular weight, etc. Uniform hydrophilic modification, improving the effect of surface hydrophilic modification, and improving the effect of enrichment

Inactive Publication Date: 2009-12-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of polyethylene glycol with poor compatibility with PET as the surface modifier, the hydrophilic polyethylene glycol is easily absorbed together with the swelling agent during the rapid deswelling process with PET non-solvent water. Extracted out, the surface modification effect is very sensitive to the molecular weight of polyethylene glycol, and the reproducibility of the results is not ideal

Method used

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  • Hydrophilic modified method of amphipathic molecule for semi-crystalline polyolefin porous membrane surface
  • Hydrophilic modified method of amphipathic molecule for semi-crystalline polyolefin porous membrane surface

Examples

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Effect test

Embodiment 1

[0024] 1) Clean the high-density polyethylene hollow fiber membrane with acetone for 24 hours, and dry it for later use;

[0025] 2) Immerse the high-density polyethylene hollow fiber membrane in tetralin at a temperature of 70° C. and swell the surface for 5 hours;

[0026] 3) Take out the high-density polyethylene hollow fiber membrane swollen on the surface, and immerse it in stearyl alcohol polyethylene glycol ether (the degree of polymerization of the polyethylene glycol part is 4, AEO- 4) Surface embedding modification in aqueous solution for 1 hour;

[0027] 4) Deswelling the surface of the high-density polyethylene hollow fiber membrane by vacuum drying, and then cleaning the amphiphilic molecules physically adsorbed on the surface of the membrane with water. The properties of the surface-modified HDPE hollow fiber membranes are shown in Table 1.

Embodiment 2

[0029] 1) Clean the high-density polyethylene hollow fiber membrane with acetone for 24 hours, and dry it for later use;

[0030] 2) Immerse the high-density polyethylene hollow fiber membrane in tetralin at a temperature of 60° C. and swell the surface for 10 hours;

[0031] 3) Take out the high-density polyethylene hollow fiber membrane swollen on the surface, and immerse it in stearyl alcohol polyethylene glycol ether (the degree of polymerization of the polyethylene glycol part is 8, AEO- 8) Surface embedding modification in aqueous solution for 2 hours;

[0032] 4) Deswelling the surface of the high-density polyethylene hollow fiber membrane by vacuum drying, and then cleaning the amphiphilic molecules physically adsorbed on the surface of the membrane with water. The properties of the surface-modified HDPE hollow fiber membranes are shown in Table 1.

Embodiment 3

[0034] 1) Clean the high-density polyethylene hollow fiber membrane with acetone for 24 hours, and dry it for later use;

[0035]2) Immerse the high-density polyethylene hollow fiber membrane in xylene at a temperature of 70° C. and swell the surface for 5 hours;

[0036] 3) Take out the high-density polyethylene hollow fiber membrane swollen on the surface, and immerse it in stearyl alcohol polyethylene glycol ether (the degree of polymerization of the polyethylene glycol part is 4, AEO- 4) Surface embedding modification in aqueous solution for 1 hour;

[0037] 4) Deswelling the surface of the high-density polyethylene hollow fiber membrane by vacuum drying, and then cleaning the amphiphilic molecules physically adsorbed on the surface of the membrane with water. The properties of the surface-modified HDPE hollow fiber membranes are shown in Table 1.

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Abstract

The invention discloses a hydrophilic modified method of an amphipathic molecule for a semi-crystalline polyolefin porous membrane surface; the method realizes directional insertion and embedding of the amphipathic molecule on a swelling surface, improves the arrayed order of the amphipathic molecules on the embedding and modified surface and enrichment degree of hydrophilic chain sections on the modified surface, and further improves the reliability of surface embedding and modified process and the surface hydrophilic modified effect. The hydrophilic modified method of the amphipathic molecule for the semi-crystalline polyolefin porous membrane surface takes the amphipathic molecule with a block structure as an amphipathic modified agent, two-step surface embedding modified process is adopted for carrying out hydrophilic modification to the semi-crystalline polyolefin porous membrane surface, namely, the semi-crystalline polyolefin porous membrane is firstly arranged in organic solvent for carrying out surface swelling, and then the polyolefin porous membrane with swelling surface is soaked in water solution of amphipathic molecule to carry out surface embedding hydrophilic modification, finally, a vacuum extracting method is adopted to carry out surface swelling restoration.

Description

technical field [0001] The invention relates to a method for hydrophilically modifying the surface of a semicrystalline polyolefin porous membrane, more specifically to a method for hydrophilically modifying the surface of a semicrystalline polyolefin porous membrane with amphiphilic molecules. Background technique [0002] Membrane separation technology has the advantages of low energy consumption, simple process, high separation efficiency, and no environmental pollution. It is an important high-tech solution to contemporary energy, resource, and environmental problems. Its application has been developed to chemical, food, pharmaceutical, biochemical, environmental protection, etc. field. Semi-crystalline polyolefin plastics, such as polypropylene (PP) and high-density polyethylene (HDPE), have been used as membrane materials to prepare high-porosity porous membranes due to their excellent performance, low price and ease of processing. application. However, due to the hy...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D71/82
Inventor 黄健王晓琳谭小春陈怡
Owner NANJING UNIV OF TECH
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