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Surface hydrophilization modification method of polyvinylidene fluoride hollow fiber membrane

A polyvinylidene fluoride and fiber membrane technology, applied in the field of materials, can solve problems such as poor compatibility, loss of raw materials, and cumbersome processes, and achieve the effects of improved anti-pollution, easy process control, and broad prospects

Active Publication Date: 2018-05-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Blending hydrophilic polymers as an additive has problems such as poor compatibility between the additive and the membrane matrix, which leads to the loss of raw materials, while the graft modification has the disadvantages of cumbersome process and high cost.

Method used

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  • Surface hydrophilization modification method of polyvinylidene fluoride hollow fiber membrane
  • Surface hydrophilization modification method of polyvinylidene fluoride hollow fiber membrane
  • Surface hydrophilization modification method of polyvinylidene fluoride hollow fiber membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Clean the PVDF hollow fiber ultrafiltration membrane: soak the PVDF hollow fiber ultrafiltration membrane in absolute ethanol for 24 hours, then rinse repeatedly with deionized water;

[0036] (2) Prepare lye: add solid potassium hydroxide to a mixture of ethanol and deionized water at a mass ratio of 1:1 and stir evenly to make lye. The mass fraction of potassium hydroxide in the solution is 5 wt.%.

[0037] (3) The hollow fiber ultrafiltration membrane cleaned in step (1) is completely immersed in the alkali solution prepared in step (2), and placed in an environment of 60° C. for 5 minutes.

[0038] (4) Take out the hollow fiber ultrafiltration membrane after alkali treatment in step (3) and repeatedly wash it with deionized water under ultrasonic vibration until it is no longer alkaline, and place the alkali treatment hollow fiber ultrafiltration membrane after cleaning in ethanol Infiltrate and set aside.

[0039] (5) Solution preparation for modification: the...

Embodiment 2

[0044] (1) Clean the PVDF hollow fiber ultrafiltration membrane: soak the PVDF hollow fiber ultrafiltration membrane in absolute ethanol for 24 hours, then rinse repeatedly with deionized water;

[0045] (2) Prepare lye: add potassium hydroxide solid to ethanol and deionized water in a mixture of ethanol and deionized water with a mass ratio of 1:1 and stir evenly to make lye, with a mass fraction of potassium hydroxide of 10wt.%.

[0046] (3) The hollow fiber ultrafiltration membrane cleaned in step (1) is completely immersed in the alkali solution prepared in step (2), and placed in an environment of 60°C for 10 minutes.

[0047] (4) Take out the hollow fiber ultrafiltration membrane after alkali treatment in step (3) and repeatedly wash it with deionized water under ultrasonic vibration until it is no longer alkaline, and place the alkali treatment hollow fiber ultrafiltration membrane after cleaning in ethanol Infiltrate and set aside.

[0048] (5) Solution preparation fo...

Embodiment 3

[0053] (1) Clean the PVDF hollow fiber ultrafiltration membrane: soak the PVDF hollow fiber ultrafiltration membrane in absolute ethanol for 24 hours, then rinse repeatedly with deionized water;

[0054] (2) Prepare lye: add potassium hydroxide solid to ethanol and deionized water in a mixture of ethanol and deionized water with a mass ratio of 1:1 and stir evenly to prepare lye, with a mass fraction of potassium hydroxide of 20wt.%.

[0055] (3) The hollow fiber ultrafiltration membrane cleaned in step (1) is completely immersed in the lye prepared in step (2), and placed in an environment of 60° C. for 120 minutes.

[0056] (4) Take out the hollow fiber ultrafiltration membrane after alkali treatment in step (3) and repeatedly wash it with deionized water under ultrasonic vibration until it is no longer alkaline, and place the alkali treatment hollow fiber ultrafiltration membrane after cleaning in ethanol Infiltrate and set aside.

[0057] (5) Solution preparation for modi...

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Abstract

The invention discloses a surface hydrophilization modification method of a polyvinylidene fluoride hollow fiber membrane, belongs to the field of materials, and discloses a method for performing hydrophilic modification on the surface of the polyvinylidene fluoride hollow fiber membrane by using an efficient click chemistry method. A hydrophilic group is introduced into the surface of the membrane to improve the anti-fouling performance of the surface of the membrane. The method is mild in condition and simple, and the process is easy to control. The method comprises the following specific steps: firstly, treating the membrane with strong alkali to generate an elimination reaction to remove a C-F bond, thus forming C=C double bonds; and then anchoring the hydrophilic group of a sulfhydrylcompound to the surface of the membrane by using the S-H bond and C=C double bonds in the sulfhydryl compound in an ultraviolet environment and under the action of a photoinitiator. The polyvinylidene fluoride membrane is low in surface energy and cannot form a hydrogen bond with water molecules; after the hydrophilic group is introduced into the surface of the membrane, the hydrophilicity and the pollution tolerance of the membrane are substantially improved.

Description

technical field [0001] The invention belongs to the field of materials, and more particularly relates to a method for preparing a hydrophilic modified polyvinylidene fluoride ultrafiltration hollow fiber membrane. Background technique [0002] Polyvinylidene fluoride (PVDF) is currently one of the most concerned membrane materials. PVDF is a semi-crystalline linear polymer with a molecular chain of -(CH 2 -CF 2 ) n -Alternating structure, due to the short length of the C-F bond and high bond energy, it has many characteristics such as excellent mechanical properties, heat resistance, chemical corrosion resistance, impact resistance, not easy to degrade, and easy to form a film. However, since the surface energy of polyvinylidene fluoride membrane is extremely low (25mN / m), and there are no hydrophilic groups on the surface such as hydroxyl (-OH), carboxyl (-COOH) or amino (-NH 2 ), and cannot produce hydrogen bonds with water molecules, so it has strong hydrophobicity. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02
CPCB01D67/009B01D67/0093B01D69/02B01D2325/36
Inventor 史翎金宇涛
Owner BEIJING UNIV OF CHEM TECH
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