Anti-pollution ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane and anti-pollution technology, applied in the field of anti-pollution ultrafiltration membrane and its preparation, can solve the problems of high irreversible pollution index, rapid water flux decay, poor anti-pollution performance, etc. The effect of reducing the decay rate and increasing the pollution resistance

Pending Publication Date: 2021-10-22
XINJIANG DELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main materials for producing ultrafiltration membranes on the market are polysulfone (PS), polyethersulfone (PES), polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), etc., but the ultrafiltration membranes in the prior art Poor anti-pollution performance, fast decay of water flux, relatively high irreversible pollution index

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The specific preparation process of the anti-fouling ultrafiltration membrane is as follows:

[0032] Step 1: Incorporate macrocyclic amphiphilic β-CD molecules into 25kg of membrane material polyvinylidene fluoride (PVDF), mix thoroughly by ultrasonication for 30 minutes, then dry the CD / PVDF mixed material under vacuum for 24 hours, and β-CD The mass percentages added are respectively 0%, 1%, and 5% (wt) of the PVDF membrane raw material, and the specific experimental results are shown in Table 1 below;

[0033] Step 2: After mixing 50kg of solvent DMAC with the PVDF raw material in the above step, react at 60°C for 6-8h, let it stand for defoaming, and use the phase inversion method to obtain an anti-pollution film.

[0034] Table 1 Membrane performance comparison

[0035] Membrane type 0％ 5％ 1％ Water flux (L / m 2 h)

[0036] Through comparative experiments, the anti-fouling performance and separation performance of the membrane were investigated. ...

Embodiment 2

[0038] The specific preparation process of the anti-fouling ultrafiltration membrane is as follows:

[0039] Step 1: Sonicate 15kg of film raw material polyvinylidene fluoride (PVDF) for 30 minutes, and dry it under vacuum for 24 hours;

[0040] Step 2: Mix PR and 70kg of solvent DMAC, and carry out ultrasonic dispersion in a conical flask at room temperature for 1 hour to form a uniform and stable solution. After mixing with the PVDF raw material in the above step, react at 60°C for 6-8 hours. Stand for defoaming, and use the phase inversion method to obtain the anti-fouling film, wherein the mass percentage of PR added is 0%, 1%, 2%, 3% (wt) of the solvent DMAC, and the specific results are shown in Table 2 below.

[0041] Table 2 Membrane performance comparison

[0042] Membrane type 0％ 1％ 2％ 3％ Water flux (L / m 2 h)

362.5 467.6 623.7 558.2 Retention rate (%) 51.3 62.4 60 75 Strength (Mpa) 2.75 3.05 2.85 3.35

[0043] From th...

Embodiment 3

[0046] The specific operation steps are the same as in Example 2, except that the ultrasonic time in step 1 is 80 min.

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PUM

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Abstract

The invention provides an anti-pollution ultrafiltration membrane and a preparation method thereof. The anti-pollution ultrafiltration membrane is mainly prepared from, by mass, 15-25 parts of PVDF membrane raw materials, 50-70 parts of DMAC solvent and a modifier, and the modifier comprises one or two of cyclodextrin and polyrotaxane; wherein the addition mass of the cyclodextrin is 1-5wt% of the PVDF membrane raw material, and the addition mass of the polyrotaxane is 1-6wt% of the DMAC solvent. According to the anti-pollution ultrafiltration membrane disclosed by the invention, one or two of cyclodextrin (CD) and derivative polyrotaxane (PR) thereof are introduced into the membrane raw materials, so that the flux and the anti-pollution performance of the membrane are improved, the flux recovery rate of the membrane is improved, the flux attenuation rate is reduced, the irreversible pollution index is obviously reduced, and the anti-pollution performance of the ultrafiltration membrane is further obviously improved.

Description

technical field [0001] The invention relates to the field of preparation of anti-pollution ultrafiltration membranes, in particular to an anti-pollution ultrafiltration membrane and a preparation method thereof. Background technique [0002] At present, the whole world is facing serious water problems. A large amount of sewage is discharged into the environment, which has a very serious impact on water bodies and has caused great harm to daily life. Water pollution and shortage of water resources have become important factors affecting people's production and life, and water problems need to be resolved urgently. Then finding a safe and efficient solution has become a very important issue in today's development. [0003] As a green water treatment technology, membrane separation technology can not only protect the environment from pollution, but also recycle useful resources in water. The effluent treated by membrane separation can be used for circulating cooling water, pa...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D61/14
CPCB01D71/34B01D61/145B01D69/02B01D67/0002B01D2325/36
Inventor 廖香红曾凡付许白羽钱铖
Owner XINJIANG DELAND
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