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A kind of preparation method of superhydrophilic modified antifouling PVDF separation membrane

A separation membrane, anti-pollution technology, used in semi-permeable membrane separation, chemical instruments and methods, osmotic/dialysis water/sewage treatment, etc., can solve problems such as strong hydrophobicity, achieve durable anti-pollution performance, easy industrial implementation, Easy to operate effect

Active Publication Date: 2021-06-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the strong hydrophobicity of existing PVDF membranes and provide a method for preparing superhydrophilic modified anti-pollution PVDF separation membranes

Method used

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  • A kind of preparation method of superhydrophilic modified antifouling PVDF separation membrane
  • A kind of preparation method of superhydrophilic modified antifouling PVDF separation membrane
  • A kind of preparation method of superhydrophilic modified antifouling PVDF separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Soak the PVDF separation membrane in clean water for 24 hours to remove impurities on the surface of the PVDF separation membrane (denoted as P0). Place the pretreated isolate membrane in a polytetrafluoroethylene closed box (single-sided reaction box), configure 1M 1,4-butanediamine and dissolve it in a sodium carbonate buffer solution (adjust pH=11.0), 200rpm , and reacted at 25°C for 12 hours until a light yellow ammonium salt compound layer appeared on the membrane. After that, it was washed alternately with water and ethanol for 24 hours, and dried in vacuum at 40°C to obtain a PVDF separation membrane modified by the first step (denoted as P-NH 2 ). The resulting membrane P-NH 2Soak it face up in 150mL of absolute ethanol, add 3mL of epichlorohydrin dropwise, protect the device with nitrogen, slowly add 40mg of benzyltriethylammonium chloride, react at 100rpm, 65°C for 5h, and then 5 mL of 0.06M sodium hydroxide solution was added dropwise, and the reaction was...

Embodiment 2

[0030] Soak the PVDF separation membrane in clean water for 24 hours to remove impurities on the surface of the PVDF separation membrane (denoted as P0). Place the pretreated isolate membrane in a polytetrafluoroethylene closed box (single-sided reaction box), configure 1M 1,4-pentanediamine and dissolve it in a sodium carbonate buffer solution (adjust pH=11.0), place In a shaker, react at 200 rpm and 25° C. for 12 hours until a light yellow ammonium salt compound layer appears on the membrane. After that, it was washed alternately with water and ethanol for 24 hours, and dried in vacuum at 40°C to obtain a PVDF separation membrane modified by the first step (denoted as P-NH 2 ). The resulting membrane P-NH 2 Soak it face up in 150mL of absolute ethanol, add 3mL of epichlorohydrin dropwise, protect the device with nitrogen, slowly add 40mg of benzyltriethylammonium chloride, react at 100rpm, 65°C for 5h, and then 5 mL of 0.06M sodium hydroxide solution was added dropwise, a...

Embodiment 3

[0032] Contact angle test: Use a contact angle tester to test the contact angle of water on the PVDF membrane surface.

[0033] After testing, the P0 contact angle of the film obtained in Example 1 was 85-95°, and after modification, the contact angles of the P-HPEI and P-HPEI-GLY films decreased significantly to 30-40° compared with the film P0, and decreased within 15s. to 0°, which proves that the modified membrane has good hydrophilicity.

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Abstract

The invention relates to a preparation method of a super-hydrophilic modified anti-pollution PVDF separation membrane. The surface of PVDF is treated with an alkaline solution to generate double bonds, and the double bonds are formed on the surface of the PVDF membrane through amino-ene addition reaction and amino-epoxy ring-opening reaction. The hyperbranched polyethyleneimine is cross-linked by chemical bonds; the hyperbranched polyethyleneimine on the surface of the membrane undergoes amino-epoxy ring-opening reaction with a glycidol solution to prepare a PVDF membrane with anti-fouling properties. The modified PVDF membrane has a large number of active groups such as amino and hydroxyl groups, which greatly improves the hydrophilicity of the membrane surface. The invention solves the strong hydrophobicity of the PVDF separation membrane itself, prevents pollutants from being easily adsorbed and deposited on the surface of the membrane or in the pores of the membrane during the application process, improves the anti-pollution ability of the membrane, and prolongs the service life of the membrane. The invention adopts a chemical method for modification, has mild conditions, is easy to operate, does not need expensive instruments, is easy to popularize, and the obtained product is firm, has good anti-pollution performance, and has potential wide application value in the field of water treatment.

Description

technical field [0001] The invention relates to a preparation method of a superhydrophilic modified anti-pollution PVDF separation membrane, belonging to the field of water treatment science and technology. Background technique [0002] Membrane separation technology is widely used in the field of membrane wastewater treatment due to its advantages of precise separation, efficient purification, and environmental protection. Polyvinylidene fluoride (PVDF) is a membrane material with excellent performance, which has the characteristics of high strength, high temperature resistance, and chemical corrosion resistance. However, in the application process of PVDF membrane separation technology, the low surface energy and strong hydrophobicity of PVDF membrane lead to low flux and easy pollution, which seriously limits its application in the field of membrane wastewater treatment. Therefore, it has become a hot spot in the field of membrane preparation to carry out hydrophilic mod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/02C02F1/44
CPCB01D67/0006B01D69/02B01D71/34B01D2323/30B01D2325/36C02F1/44
Inventor 王志伟文越张星冉陈颖青王巧英吴志超
Owner TONGJI UNIV
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