Polymer film with improved antifouling property and preparation method thereof

A polymer membrane, antifouling technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of improving hydrophilic and hydrophobic properties

Active Publication Date: 2015-03-04
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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  • Polymer film with improved antifouling property and preparation method thereof
  • Polymer film with improved antifouling property and preparation method thereof
  • Polymer film with improved antifouling property and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] Preparation of PVDF Flat Membrane with Antifouling Function

[0070] 1. Preparation of modified nanoparticles

[0071]Disperse 1 g of hydrophilic silica nanoparticles into 100 g of water with a pH value of 6, add 0.05 g of epoxy silane coupling agent KH560, and react at 95 °C for 8 hours; then add 0.08 g of lysine Amino acid, continue to react at 95 ℃ for 2 hours. After the reaction, centrifuge to collect the modified nanoparticles for use.

[0072] see figure 1 In the infrared spectrum shown, the silica nanoparticles are surface-modified with lysine, and the IR spectrum is at 1518 cm -1 and 1410 cm -1 New peaks appeared at , which were attributed to the N-H vibration of amino groups and the symmetrical stretching vibration of carboxylic acid groups, indicating that lysine had been successfully grafted on the surface of silica nanoparticles, and the surface zwitterionization of nanoparticles had been realized.

[0073] 2. Preparation of polymer films

[0074] Ul...

Embodiment 2

[0084] Preparation of PVDF hollow fiber membrane with antifouling function

[0085] 1. Preparation of modified nanoparticles

[0086] Disperse 1 g of hydrophilic silica nanoparticles into 100 g of water with a pH value of 5, add 0.2 g of KH560, and react at 95 °C for 10 hours; then add 0.3 g of lysine, and continue to React for 3 h. After the reaction, centrifuge to collect the modified nanoparticles for use.

[0087] 2. Preparation of polymer films

[0088] 0.05 g of modified silica nanoparticles and 0.5 g of PVP were ultrasonically dispersed into 60 g of NMP at a power of 100-1000 W using an ultrasonic machine, and then 10 g of PVDF was added to obtain a casting solution; the casting solution was processed after 8 hours After the vacuum defoaming treatment, put it into the spinning kettle, and extrude from the spinneret composed of two concentric tubes under the metering pump at a speed of 10 r / min and a spinning pressure of 0.5 MPa; without drying In the spinning proc...

Embodiment 3

[0096] Preparation of PES Flat Film with Antifouling Function

[0097] 1. Preparation of modified nanoparticles

[0098] Ultrasonic dispersion of 1 g of titanium dioxide nanoparticles into 100 g of water with a pH value of 6, added 0.5 g of epoxy silane coupling agent KH560, and reacted at 95 °C for 12 hours; then added 1 g of lysine, and continued at 95 °C for 6 hours. After the reaction, centrifuge to collect the modified nanoparticles for use.

[0099] 2. Preparation of polymer films

[0100] Ultrasonic disperse 1 g of modified titanium dioxide nanoparticles into 50 g of DMF, then add 10 g of PES and 0.5 g of PEG, and use a high-speed mechanical stirrer to stir and dissolve at a rate of 10000 r / min for 40 min to obtain a casting solution; After 6 hours of vacuum defoaming treatment on the casting solution, the casting solution was directly scraped into a flat film with a film thickness of 200 μm, which was immersed in a water bath at 30 °C to solidify and form.

[010...

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Abstract

The invention discloses a polymer film with antifouling property. Silicon dioxide nanoparticles or titanium dioxide nanoparticles with amphoteric ionized surfaces are evenly dispersed in the polymer film, wherein the surfaces of the nanoparticles are coated with carboxyl anion-ammonium cation zwitter-ion pairs; the content of the silicon dioxide nanoparticles or the titanium dioxide nanoparticles in the polymer film is 0.3-10wt%; the surface contact angle of the polymer film is reduced to below 50%; the secondary water flux recovery rate in an antifouling separation test reaches over 95%; and the antifouling property is obviously improved.

Description

technical field [0001] The present invention relates to a polymer film with improved antifouling properties and a preparation method thereof, more specifically, to a polymer film uniformly dispersed with surface amphoteric ionized silica nanoparticles or titanium dioxide nanoparticles and its preparation method. technical background [0002] In water treatment, separation membranes for nanofiltration or ultrafiltration are often plagued by interface fouling problems. 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 polymer 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 the separati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/06B01D69/08B01D71/34B01D71/68B01D71/42B01D67/00C02F1/44
Inventor 何春菊赵新振刘大朋朱静王海晔
Owner DONGHUA UNIV
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