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Surface modification method for polymer separation membrane

A surface modification and separation membrane technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., to achieve the effect of simple modification equipment, good stability and durability, and low cost

Active Publication Date: 2013-04-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, using the oxidative self-polymerization products of dopa compounds to form a super-adhesive layer on the surface of the film, and further complexing PVP or PVP-I through non-covalent bond interaction (multi-point hydrogen bond), the preparation of recyclable The method of using the anticoagulant antibacterial polymer separation membrane has not been reported yet

Method used

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  • Surface modification method for polymer separation membrane
  • Surface modification method for polymer separation membrane
  • Surface modification method for polymer separation membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Dissolving dopamine in deionized water, dripping a sodium hydroxide solution with a concentration of 1 mol / liter, adjusting the pH value of the solution to 7.5, and obtaining a dopamine solution with a concentration of 1 gram / liter; Dissolve in deionized water to obtain a polyvinylpyrrolidone solution with a concentration of 0.5 to 5 g / L; cut out the washed and dried PE flat microfiltration membrane 5×5cm 2 , take it out after soaking in ethanol for 1 hour, immediately soak in dopamine solution to react, and form a self-polymerized dopamine composite layer on the membrane surface and membrane pore wall. permanent PE flat microfiltration membrane; soak the dopamine composite modified PE flat microfiltration membrane in polyvinylpyrrolidone solution, through the polyvinylpyrrolidone polyvinylpyrrolidone between the catechol group on the membrane surface and the polyvinylpyrrolidone lactam group Through hydrogen bonding, the polyvinylpyrrolidone is firmly complexed to the ...

Embodiment 2

[0041] Dissolving dopa in deionized water, dripping a sodium hydroxide solution with a concentration of 1 mol / liter, adjusting the pH value of the solution to 10, and obtaining a dopa solution with a concentration of 0.2 to 5 g / liter; Dissolve polyvinylpyrrolidone in deionized water to obtain a polyvinylpyrrolidone solution with a concentration of 2 g / L; cut 20 PVDF hollow fiber ultrafiltration membranes with a length of 10 cm, wash and dry them, and soak them in ethanol for 1 hour Take it out, soak it in the dopa solution immediately to react, and form a self-polymerized dopa composite layer on the surface of the membrane and the membrane hole wall. The PVDF hollow fiber ultrafiltration membrane; the dopa composite modified PVDF hollow fiber ultrafiltration membrane is soaked in polyvinylpyrrolidone solution, through the catechol group on the surface of the membrane and the lactam group in polyvinylpyrrolidone The polyvinylpyrrolidone is firmly complexed to the PVDF membrane ...

Embodiment 3

[0046] Dissolving dopamine in deionized water, dripping a sodium hydroxide solution with a concentration of 1 mol / liter, adjusting the pH value of the solution to 8.5, and obtaining a dopamine solution with a concentration of 2 grams / liter; Dissolve in deionized water to obtain a polyvinylpyrrolidone solution with a concentration of 2 g / L; dissolve elemental iodine in ethanol to obtain an iodine solution with a concentration of 10 to 100 g / L; cut the washed and dried PSF tablet Filter membrane 5×5cm 2 , take it out after soaking in ethanol for 1 hour, immediately soak in dopamine solution to react, and form a self-polymerized dopamine composite layer on the membrane surface and membrane pore wall. PSF flat-panel nanofiltration membrane; the dopamine-modified PSF flat-panel nanofiltration membrane is soaked in polyvinylpyrrolidone solution, through the polyvinylpyrrolidone polyvinylpyrrolidone between the catechol group and the polyvinylpyrrolidone polyvinylpyrrolidone. Polyvi...

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Abstract

The invention discloses a surface modification method for a polymer separation membrane. Under the water solution condition, a dopa compound is easily oxidized by dissolved oxygen in water to generate auto-agglutination-composite reaction in order to generate a firmly attached dopa compound composite layer on the surface of the polymer separation membrane; the dopa compound composite layer contains rich catechol radicals which can form the multi-point hydrogen bonding effect with lactam radicals in polyvinylpyrrolidone, and the polyvinylpyrrolidone is firmly complexed on the surface of the separation membrane; and the polymer separation membrane immobilized with povidone-iodine on the surface can be prepared through the complexation between the polyvinylpyrrolidone and iodine. The method has simple technique, and is suitable for the polymer separation membranes with different materials and shapes; and the modified polymer separation membrane has excellent hydrophily, blood compatibility, contamination resistance and bacterial resistance, so that the important significance is given to improve the comprehensive performance of the polymer separation membrane.

Description

technical field [0001] The invention relates to the technical field of surface modification of polymer separation membranes, in particular to a method for surface modification of polymer separation membranes. Background technique [0002] Membrane technology is a separation technology that has gradually emerged since the 1980s. It has been widely used in water treatment, chemical separation, food, environment, energy, biomedicine and other fields. Membrane technology has the advantages of cost-effectiveness, environmental protection, etc. It is one of the common supporting new technologies to solve major problems in the fields of environment, water resources, and energy that human beings are currently facing. Membrane materials are the core of membrane technology, and the properties of membrane materials play a decisive role in the physical and chemical stability and separation performance of membranes. Among them, organic polymer membrane materials have good film-forming p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D71/38B01D67/00
Inventor 朱利平蒋金泓徐又一
Owner ZHEJIANG UNIV
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