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Water gel modified anti-protein pollution ultrafiltration membrane and preparation method thereof

A technology for modifying and membrane surface, which is applied in ultrafiltration, water/sewage treatment, chemical instruments and methods, etc. It can solve the problems of inability to guarantee the stability of the gel layer, affect the resistance to proteins, and complicated operation, and achieve easy cleaning, The effect of good biocompatibility and simple operation

Active Publication Date: 2018-08-14
TIANJIN POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the stability of the gel layer cannot be guaranteed during long-term filtration, and the gel is easy to fall off from the membrane surface, which seriously affects the effect of anti-protein contamination.
However, due to the limitation of the gel formation mechanism, it is difficult to graft the gel onto the membrane surface, or to form a gel to load the water-soluble polymer onto the membrane surface, and it is necessary to add a cross-linking agent, which makes the operation complicated and the cost increases

Method used

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  • Water gel modified anti-protein pollution ultrafiltration membrane and preparation method thereof
  • Water gel modified anti-protein pollution ultrafiltration membrane and preparation method thereof
  • Water gel modified anti-protein pollution ultrafiltration membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Synthesis of N-acryloyl glycinamide:

[0035] 1) Add glycinamide hydrochloride (6.30g, 0.05706mol), 6mL deionized water, 33.6mL cold potassium carbonate (2mol / L) and 18mL cold ether into a three-necked glass flask (volume 100mL, ice-water mixing bath )middle;

[0036] 2) Add a mixed solution of diethyl ether (24mL) and acryloyl chloride (5.70g) dropwise to the above mixture using a constant pressure separatory funnel, and finish adding dropwise for 1 hour, and continue stirring at room temperature for 4 hours;

[0037] 3) Add 6mol / L HCl dropwise to the above reacted mixture to adjust the pH to 2;

[0038] 4) The above mixture was washed three times with 150 mL of ether, and then the residual ether was removed by rotary evaporation;

[0039] 5) Adjust the pH of the mixture solution to neutral with 2mol / L NaOH, and freeze-dry to obtain the crude product;

[0040] 6) The crude product (N-acryloylglycylamide and potassium chloride, etc.) was washed three times with 1...

Embodiment 2

[0048] (1) Synthesis of N-acryloylglycinamide: same as Example 1.

[0049] (2) Preparation of anti-protein contamination separation membrane:

[0050] 1) The pore size is 0.22μm, the upper surface area is 18cm 2 The PVDF commercial original membrane is cleaned in methanol solution;

[0051] 2) Soak the cleaned PVDF membrane in methanol solution containing benzophenone (0.7mol / L), take it out after 1h and let it dry naturally;

[0052] 3) Weigh 0.4g of N-acryloyl glycinamide, 0.1g of ferrous ammonium sulfate, 11mL of methanol and 39mL of distilled water to make a mixed solution, then transfer it into a quartz tube, pass nitrogen gas for 0.5h, and immerse the dried PVDF membrane in , sealed and preserved;

[0053] 4) Place the sealed quartz tube in an optical density of 6J / cm 2 Irradiate under UV lamp for 35min. The membrane was then removed and washed with methanol and aqueous solution.

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Abstract

The invention relates to a water gel modified anti-protein pollution ultrafiltration membrane and a preparation method thereof. Vinyl materials (CH2=CH(CONH2)n, wherein n is greater than 1 but smaller5) containing multiamides groups at the lateral chain are used as monomers; ferrous ammonium sulphate are used as polymerization inhibitors; water and methanol are used as solvents; through ultraviolet radiation grafting, a gel layer with hydrophilicity is obtained on the surface of the PVDF ultrafiltration membrane. The initial contact angle of the modified membrane surface is reduced to 55 degrees from the initial 120 degrees, and can reach 0 degree in 10 to 12s; the water flux restoration rate can reach 90 to 99 percent. The surface of the prepared separation membrane has excellent anti-protein pollution capability; the biocompatibility is relatively good. Compared with a conventional method of coating water gel onto the surface of the membrane, the method has the advantages that the gel layer grafted onto the surface of the membrane has more excellent stability; the preparation method is simple; the addition of chemical crosslinking agents is not needed; the performance is stable;the cleaning is easy.

Description

technical field [0001] The invention belongs to the field of polymer separation membranes, and relates to a hydrogel-modified anti-protein pollution ultrafiltration membrane and a preparation method thereof. Background technique [0002] Compared with traditional separation methods, membrane separation technology has the advantages of high efficiency, low energy consumption, and no phase change. Among them, polyvinylidene fluoride (PVDF) membrane has good mechanical properties, chemical corrosion resistance, and good thermal stability, so it has great attraction in the membrane industry and has a wide range of applications in liquid separation. However, due to the presence of fluorine atoms on the surface of the PVDF membrane, the surface exhibits a large hydrophobicity, which makes it very easy to adsorb proteins. When PVDF membranes are applied to the separation of biological products, proteins are easily adsorbed on the membrane surface, resulting in attenuation of membr...

Claims

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Application Information

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IPC IPC(8): B01D61/14B01D69/12B01D67/00B01D71/78C02F1/44
CPCB01D61/145B01D69/125B01D71/78B01D2325/12B01D2325/30C02F1/444
Inventor 付维贵裴腾飞毛云云李国霞孙宝山陈莉
Owner TIANJIN POLYTECHNIC UNIV
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