Method for hydrophilic modification of ultrahigh molecular weight polyethylene microporous membrane surface

A technology of ultra-high molecular weight and microporous membranes, which is applied in the field of preparation of ozone-grafted ultra-high molecular weight polyethylene microporous membranes

Inactive Publication Date: 2005-07-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrophilic modification of UHMWPE microporous membranes using ozone-activated grafting technology has not been reported yet

Method used

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  • Method for hydrophilic modification of ultrahigh molecular weight polyethylene microporous membrane surface
  • Method for hydrophilic modification of ultrahigh molecular weight polyethylene microporous membrane surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]Example 1: Treat the pretreated UHMWPE microporous membrane with a size of 5 × 10cm at a voltage of 180V, a discharge current of 0.8A and an oxygen flow rate of 1.0L / min for 15min with an ozone concentration of 40mg / L, and then place it in a polymerization tube In, add 10.0% purified vinyl acetate (VAc) ethanol solution, and add 1.0×10 -6 mol / L ferrous chloride catalyst aqueous solution, seal the polymerization tube, place it in a constant temperature oscillator, react at 20°C for 10h, take it out, clean the membrane, and put it in 0.5mol / L NaOH methanol solution at 25°C After saponification and hydrolysis for 10 hours, wash the membrane to neutrality, and the prepared hydrophilic microporous membrane has a water flux of 246L / m at 0.5MPa 2 h.

Embodiment 2

[0039] Example 2: Treat the pre-treated UHMWPE microporous membrane with a size of 5 × 5cm at a voltage of 220V, a discharge current of 0.2A and an oxygen flow rate of 0.2L / min for 90min with an ozone concentration of 10mg / L, and then place it in a polymerization tube In, add 20% purified vinyl acetate (VAc) in acetone solution, and add 5.0×10 -3 mol / L ferrous ammonium sulfate catalyst aqueous solution, seal the polymerization tube, place it in a constant temperature oscillator, react at 40°C for 5h, take it out, clean the membrane, and put it in 1.0mol / L KOH ethanol solution at 10°C After saponification and hydrolysis for 8 hours, wash the membrane to neutrality, and the prepared hydrophilic microporous membrane has a water flux of 156L / m under 0.5MPa 2 h.

Embodiment 3

[0040] Example 3: Treat the pretreated UHMWPE microporous membrane with a size of 5×10cm at a voltage of 200V, a discharge current of 0.4A and an oxygen flow rate of 0.4L / min for 30min with an ozone concentration of 30mg / L, and then place it in a polymerization tube In, add 3% ethyl acetate solution of purified vinyl acetate (VAc), and add 2.6×10 -4 mol / L ferrous ammonium sulfate catalyst aqueous solution, seal the polymerization tube, place it in a constant temperature oscillator, react at 40°C for 3 hours, take it out, clean the membrane, put it in 0.8mol / L NaOH isopropanol solution, After saponification and hydrolysis at 50°C for 2 hours, the membrane was washed to neutrality. The prepared hydrophilic microporous membrane had a water flux of 201L / m at 0.5MPa 2 h.

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Abstract

The hydrophilic modification method of surface of ultrahigh molecular weight polyethylene microporous filtering membrane belongs to the field of ozone grafted ultrahigh molecular weight polyethylene microporous filtering membrane preparation technology. It is characterized by that it utilizes ozone to initiate graft reaction on the surface of microporous filtering membrane, it selects vinyl-acetic ester (VAc) as graft monomer, after graft reaction makes saponification hydrolysis to form polyvinyl alcohol (PVA) hydrophilic group. The obtained microporous filtering membrane has good hydrophilic property and moisture absorbability.

Description

technical field [0001] The invention relates to a method for preparing a hydrophilic microporous filter membrane used in the fields of sewage treatment and blood purification, more specifically a method for preparing an ozone-grafted ultra-high molecular weight polyethylene microporous filter membrane. Background technique [0002] Ultra-high molecular weight polyethylene (UHMWPE) microporous membrane has high porosity, high mechanical strength, excellent chemical solvent corrosion resistance, bacterial erosion resistance and good biocompatibility, and long-term use performance in sewage treatment Stable, not easy to degrade and other excellent properties. However, since UHMWPE is a non-polar material with low surface energy and is inert and hydrophobic, it has disadvantages such as poor water absorption, easy electrostatic charge, and poor anti-pollution performance when used as a sewage treatment material. Therefore, it must be modified by hydrophilicity. [0003] Graft c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/28B01D71/78
Inventor 陈翠仙郭红霞王平李继定
Owner TSINGHUA UNIV
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