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Novel hydrophobic modification system p-carboxyl MWCNT/PVDF blend membrane surface modification method

A hydrophobic modification and surface modification technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve the problem that the hydrophobicity and permeation flux of super-hydrophobic membrane materials cannot be increased at the same time, and achieve short time and high pore size. The effect of uniform structure distribution, reducing energy consumption and time

Inactive Publication Date: 2017-07-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrophobicity and permeation flux of superhydrophobic membrane materials sometimes cannot be increased at the same time, and the effective control of the preparation technology needs to be further improved, so there are still some problems that need to be solved

Method used

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  • Novel hydrophobic modification system p-carboxyl MWCNT/PVDF blend membrane surface modification method
  • Novel hydrophobic modification system p-carboxyl MWCNT/PVDF blend membrane surface modification method

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Embodiment 1

[0032] A method for modifying the surface of a carboxylated MWCNT / PVDF blend membrane by a new hydrophobic modification system, the method steps are as follows,

[0033] (1) Preparation of MWCNT / PVDF blend membrane:

[0034] 0.05g MWCNTs-COOH (0.49%, 2%), 30ml DMF, ultrasonic 40min to fully disperse MWCNTs-COOH, add 5g PVDF powder and stir vigorously in a constant temperature water bath at 70°C for 4h to make a casting solution;

[0035] (2) Alkali pretreatment:

[0036] Wet the MWCNT / PVDF blend membranes with different carboxylation contents with ethanol, and then soak them in NaOH solution (pH=10) for alkali treatment for 0, 5, 10, 15 min;

[0037] (3) Silanization modification:

[0038] 98% OTS and 90% (w / w) ethanol / water were formulated into silane coupling agent solutions with a concentration of 2%, 5%, and 7%, respectively, and the blended membrane after alkali treatment was immersed and placed on a vibrating shaker Medium reaction for 4 hours;

[0039] (4) Post-proc...

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Abstract

The invention relates to a novel hydrophobic modification system p-carboxyl MWCNT / PVDF blend membrane surface plasma modification method. The method comprises the following steps: 1) MWCNT / PVDF blend membrane preparation: 0.05 g of MWCNTs-COOH (0.49%,2%) and 30 ml of DMF are subjected to ultrasonic wave for 40 min to fully disperse the MWCNTs-COOH, 5g of PVDF powder is added in a constant temperature water-bath at the temperature of 70 DEG C for violent stirring for 4 h, a casting solution is prepared; 2) alkaline pretreatment: the MWCNT / PVDF blend membranes with different carboxylation contents are wet by ethanol, and then are immersed in a NaOH solution (pH=10) for alkaline treatment for 0, 5, 10, 15 min; 3) silanization modification: 98% of OTS and 90% (w / w) of ethanol / water are prepared to the silane coupling agent solutions with concentration of 2%, 5% and 7%, the blend membrane processed by alkaline treatment is immersed, the material is placed in an oscillation shaking table for a reaction for 4 h; and 4) post-treatment phase: the reacted blend membrane is taken out, and placed into a vacuum baking oven, heat treatment is carried out for 2 hours at the temperature of 50-80 DEG C, and washing by 30% of ethanol / water is carried out for three times. The method has the advantages of simple operation, short experiment period and low cost.

Description

technical field [0001] The invention relates to a method for modifying the surface of a carboxylated MWCNT / PVDF blend film with a new hydrophobic modification system, belonging to the technical field of functional materials. Background technique [0002] Polyvinylidene fluoride (PVDF) material has good thermal stability, mechanical properties and chemical resistance, and can be dissolved in organic polar solvents. It has become a widely used membrane material in the field of ultrafiltration and microfiltration. However, the hydrophobicity of polyvinylidene fluoride membrane is strong, and it is very easy to be fouled by membrane, which leads to the decrease of water flux. Carbon nanotubes have also been popular as polymer nanofillers due to their high aspect ratio and surface area, excellent electrical, mechanical, and thermal properties, and their processability. However, the dispersibility of MWCNT is not good, and it is easy to agglomerate in the solvent, so the blending...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
CPCB01D71/34B01D67/0006B01D69/02B01D2325/38
Inventor 李广芬张艳霞李志鹏史乐蒋策
Owner TIANJIN POLYTECHNIC UNIV
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