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A kind of PVDF membrane with antifouling performance and preparation method thereof

A technology of antifouling performance and membrane solvent, which is applied in the direction of chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problem that zwitterionic polymers cannot be dissolved, and achieve the characteristics of inhibiting easy agglomeration, obvious antifouling performance, The effect of improving dispersion

Active Publication Date: 2016-08-31
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, zwitterionic polymers cannot be dissolved in organic solvents, and it is difficult to be fully applied in the processing of polymer films.

Method used

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  • A kind of PVDF membrane with antifouling performance and preparation method thereof
  • A kind of PVDF membrane with antifouling performance and preparation method thereof
  • A kind of PVDF membrane with antifouling performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of PVDF Flat Membrane with Antifouling Function

[0054] 1. Preparation of modified titania nanoparticles

[0055] 1) Disperse 1 g of titanium dioxide nanoparticles into 20 ml of Tris-HCl buffer solution with a pH of 8.5; add 0.1 g of dopamine, react at 30 °C for 2 h, filter after the reaction, separate the nanoparticles, and dry them in vacuum until use;

[0056] 2) Disperse 1 g of nanoparticles obtained in step 1) into 30 ml of tetrahydrofuran, add 1 ml of triethylamine; then add 10 ml of tetrahydrofuran solution containing 3 ml of bromopropionyl bromide dropwise into the nanoparticle dispersion , react at 0 °C for 1 h; centrifuge, wash the nanoparticles with 100 ml 50 wt% ethanol aqueous solution, and dry them in vacuum for later use;

[0057] 3) Disperse the nanoparticles obtained in step 2) into a flask containing 20 ml of tetrahydrofuran, and add CuBr, EBiB, PMDETA and DMAEMA at a molar ratio of 1:1:1:100, wherein the amount of CuBr is 0.1 mmol; Us...

Embodiment 2

[0070] Preparation of PVDF Flat Membrane with Antifouling Function

[0071] 1. Preparation of Modified Silica Nanoparticles

[0072] 1) Disperse 1 g of silica nanoparticles into 15 ml of Tris-HCl buffer solution with a pH of 8.5; add 0.5 g of dopamine, react at 40 °C for 10 h, filter after the reaction, separate the nanoparticles, and vacuum dry and ready to use;

[0073] 2) Disperse 1 g of nanoparticles obtained in step 1) into 30 ml of tetrahydrofuran, add 1 ml of triethylamine; then add 10 ml of tetrahydrofuran solution containing 3 ml of bromopropionyl bromide dropwise into the nanoparticle dispersion , react at 0 °C for 5 h; centrifuge, wash the nanoparticles with 200 ml 50 wt% ethanol aqueous solution, and dry them in vacuum for later use;

[0074] 3) Disperse the nanoparticles obtained in step 2) into a flask containing 20 ml of tetrahydrofuran, and add CuBr, EBiB, PMDETA and DMAEMA at a molar ratio of 1:1:1:300, wherein the amount of CuBr is 0.1 mmol; Use nitrogen ...

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Abstract

The invention discloses a PVDF membrane with an antifouling property. Surface amphiprotic ionized silicon dioxide nano particles or titanium dioxide nano particles are uniformly dispersed in the interior of the PVDF membrane with the antifouling property, wherein the surfaces of the nano particles are coated with a glycine betaine type amphiprotic ionic polymer, the content of the silicon dioxide nano particles or titanium dioxide nano particles in the PVDF membrane is 0.8-20wt%, the surface contact angle of the PVDF membrane is below 50 degrees, and the secondary water flux recovery rate in a BSA resisting contaminant test is up to more than 95%.

Description

technical field [0001] The invention relates to a PVDF membrane with antifouling performance and a preparation method thereof, more specifically, to a PVDF membrane uniformly dispersed with surface amphoteric ionized silicon dioxide nanoparticles or titanium dioxide nanoparticles and a preparation method thereof. technical background [0002] In water treatment, PVDF separation membranes used for nanofiltration or ultrafiltration are often plagued by the problem of interface fouling. Pollution mainly includes inorganic pollution, organic pollution and biological pollution, especially organic pollution. Organic pollutants include various proteins. With the help of hydrophobic interaction, hydrophobic proteins are easily attached to the surface and pores of PVDF membrane materials, causing irreversible pollution. [0003] Membrane fouling has become a bottleneck problem restricting the development of the membrane industry. Membrane fouling has caused a significant decrease in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/06B01D67/00B01D69/02
Inventor 赵新振马鹏程刘大朋王海晔何春菊
Owner DONGHUA UNIV
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