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Preparation method of superhydrophilic anti-pollution PVDF (polyvinylidene fluoride) separation membrane

A separation membrane and anti-pollution technology, applied in semi-permeable membrane separation, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc., can solve problems such as strong hydrophobicity, and achieve easy operation, easy industrial implementation, and good control effect

Active Publication Date: 2018-08-17
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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  • Preparation method of superhydrophilic anti-pollution PVDF (polyvinylidene fluoride) separation membrane
  • Preparation method of superhydrophilic anti-pollution PVDF (polyvinylidene fluoride) separation membrane
  • Preparation method of superhydrophilic anti-pollution PVDF (polyvinylidene fluoride) separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Soak the PVDF separation membrane in clean water for 24 h to remove the 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 1 M 1,4-butanediamine and dissolve it in sodium carbonate buffer solution (adjust pH=11.0), 200 rpm, 25 o Under the condition of C, react for 12 h until a light yellow ammonium salt compound layer appears on the membrane. After washing with water and ethanol alternately for 24 h, at 40 o Under vacuum drying under C conditions, the PVDF separation membrane obtained after the first step modification (denoted as P-NH 2 ). The resulting membrane P-NH 2 Soak it face up in 150 mL of absolute ethanol, add 3 mL of epichlorohydrin dropwise to protect the device with nitrogen, slowly add 40 mg of benzyltriethylammonium chloride, at 100 rpm, 65 o C for 5 h, then add 5 mL of 0.06 M sodium hydroxide solution dropwise, ...

Embodiment 2

[0031] Soak the PVDF separation membrane in clean water for 24 h to remove the 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 1 M 1,4-pentanediamine and dissolve it in sodium carbonate buffer solution (adjust pH=11.0), placed in a shaker, 200 rpm, 25 o Under the condition of C, react for 12 h until a light yellow ammonium salt compound layer appears on the membrane. After washing with water and ethanol alternately for 24 h, at 40 o Under vacuum drying under C conditions, the PVDF separation membrane obtained after the first step modification (denoted as P-NH 2 ). The resulting membrane P-NH 2 Soak in 150 mL of absolute ethanol with the front side up, add 3 mL of epichlorohydrin dropwise to protect the device with nitrogen, slowly add 40 mg of benzyltriethylammonium chloride, at 100rpm, 65 o C for 5 h, then add 5 mL of 0.06 M sodi...

Embodiment 3

[0033] Contact angle test: Use a contact angle tester to test the contact angle of water on the PVDF membrane surface.

[0034] After testing, the P0 contact angle of the film obtained in Example 1 is 85-95 o , after modification, the contact angle ratio of P-HPEI and P-HPEI-GLY decreased significantly to 30-40 o , and drop to 0 within 15 s o , which proves that the modified membrane has good hydrophilicity.

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Abstract

The invention relates to a preparation method of a superhydrophilic anti-pollution PVDF (polyvinylidene fluoride) separation membrane. An alkaline solution is used to treat PVDF surface to generate double bonds; hyperbranched polyethyleneimine is crosslinked on the PVDF membrane surface via chemical bonds by means of amino-vinyl additive reaction and amino-epoxy ring-opening reaction; the hyperbranched polyethyleneimine on the membrane surface are subjected to amino-epoxy ring-opening reaction with glycidol to obtain the anti-pollution PVDF membrane. The modified PVDF membrane has massive amino groups, hydroxyl radicals and other active groups, so that the membrane surface hydrophilicity is greatly improved. The problem with high hydrophobicity of the PVDF membrane itself is solved; it isavoided that pollutants easily adsorb or deposit on membrane surface or in membrane pores during application; anti-pollution capacity of the membrane is improved; the service life of the membrane is extended. Modifying is carried out herein by chemical processes, the conditions are mild, operating is simple, expensive instruments are not required, and the preparation method is easy to popularize,the product is firm, has good anti-pollution performance and has potential great application value in the water treatment field.

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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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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