Preparation method and applications of hyperbranched zwitterion modified polyvinylidene fluoride oil-water emulsion separation membrane

A polyvinylidene fluoride oil and polyvinylidene fluoride membrane technology is applied in the field of preparation of a new type of hyperbranched zwitterion-modified polyvinylidene fluoride oil-water emulsion separation membrane, and can solve the problems of shortening the service life of the membrane, attenuation of membrane flux, and impact on The development and application of separation membrane materials have achieved the effect of controllable structure, simple equipment, stable and continuous anti-pollution performance

Active Publication Date: 2018-11-30
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the separation membrane material used in the separation process is mainly a polymer membrane. During the treatment of emulsified oil, oil or other impurities are easy to adhere to the surface of the separation membrane,

Method used

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  • Preparation method and applications of hyperbranched zwitterion modified polyvinylidene fluoride oil-water emulsion separation membrane
  • Preparation method and applications of hyperbranched zwitterion modified polyvinylidene fluoride oil-water emulsion separation membrane
  • Preparation method and applications of hyperbranched zwitterion modified polyvinylidene fluoride oil-water emulsion separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Dissolve dimethylaminoethyl methacrylate, trithiocarbonate and azobisisobutyronitrile in toluene, stir magnetically at 70°C for 24 hours, and obtain uniform, yellow Clear solution. After the reaction was completed, the yellow transparent solution was rotary evaporated at 40° C. to remove part of the toluene. The solution after rotary evaporation was added dropwise to ice n-hexane / ethyl acetate mixed solution to obtain a yellow precipitate; the precipitate was soaked in n-hexane solution for 30 min. The obtained yellow precipitate was vacuum-dried to obtain hyperbranched polydimethylaminoethyl methacrylate;

[0035] (2) A certain amount of hyperbranched polydimethylaminoethyl methacrylate in step (2) is dissolved in methanol, stirred evenly at room temperature, after it dissolves completely, add excess 1,3-propanesulfonic acid Lactone, under the protection of an inert gas, heated and reacted at 60°C for 48 hours to obtain a hyperbranched zwitterionic polymer;

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Embodiment 2

[0042] (1) The preparation method of thiol-terminated hyperbranched zwitterionic polymer is the same as in Example 1;

[0043] (2) The preparation method of dopamine-modified polyvinylidene fluoride film is the same as in Example 1;

[0044] (3) Soak the above-mentioned dopamine-modified polyvinylidene fluoride membrane in a Tris-HCl buffer solution with pH=8.5 for vacuum deoxygenation; add 0.025 g of thiol-terminated hyperbranched zwitterionic polymer, wait for it to dissolve, and add 35 μl of triethylamine ;

[0045] (4) The above reaction was placed in a constant temperature oscillator for 4 hours, and the reaction was continued for 8 hours in the atmosphere. After the reaction is finished, rinse with distilled water and dry to obtain a polyvinylidene fluoride oil-water emulsion separation membrane with good hydrophilicity and underwater super-oleophobicity.

Embodiment 3

[0047] (1) The preparation method of thiol-terminated hyperbranched zwitterionic polymer is the same as in Example 1;

[0048] (2) The preparation method of dopamine-modified polyvinylidene fluoride film is the same as in Example 1;

[0049] (3) Soak the above-mentioned dopamine-modified polyvinylidene fluoride membrane in a Tris-HCl buffer solution with pH=8.5 for vacuum deoxygenation; add 0.1 g of thiol-terminated hyperbranched zwitterionic polymer, wait for it to dissolve, and add 35 μl of triethylamine ;

[0050] (4) Put the above reaction in a constant temperature oscillator to react for 4 hours, and continue to react for 8 hours in the air; after the reaction is completed, rinse with distilled water and dry to obtain a super-hydrophilic polyvinylidene fluoride oil-water emulsion separation membrane.

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Abstract

The invention provides a preparation method of a polyvinylidene fluoride oil-water emulsion separation membrane with characteristics of good surface hydrophilicity and underwater super oleophobicity.According to the method, hyperbranched polydimethylaminoethyl methacrylate with controlled molecular weight is prepared by using dimethylaminoethyl methacrylate containing a tertiary amine group as amonomer through a reversible addition-fragmentation chain transfer polymerization method; the hyperbranched polydimethylaminoethyl methacrylate with controlled molecular weight and 1,3-propane sultoneare subjected to a quaternization reaction to prepare a hyperbranched zwitterionic polymer; a thiol-functionalized hyperbranched zwitterionic polymer is obtained through an aminolysis reaction; and the hyperbranched zwitterionic polymer is introduced onto the surface of a polyvinylidene fluoride membrane by using a surface biomimetic chemical modification method so as to effectively improve the hydrophilicity of the polyvinylidene fluoride membrane, such that the separation membrane has efficient and stable oil-water emulsion separation ability. According to the present invention, the polyvinylidene fluoride membrane is subjected to surface modification, the used modifier has the controlled structure, and the prepared oil-water emulsion separation membrane has excellent anti-pollution performance, and has important practical application value in oil-water separation.

Description

Technical field: [0001] The invention belongs to the field of polymer material science, and in particular relates to a preparation method and application of a novel hyperbranched zwitterion-modified polyvinylidene fluoride oil-water emulsion separation membrane. Background technique: [0002] Water resources are one of the most important resources on the earth, an important resource for maintaining basic human life activities, and the material basis for the survival of all living things. The main sources of water pollution include: industrial pollution, domestic pollution and agricultural pollution. The massive discharge of oily wastewater in daily life and industrial production, as well as frequent crude oil spills pose a huge threat to water resources. Among them, a large amount of oily wastewater produced in industrial production is the main form of water pollution. In order to effectively curb the harm caused by oily wastewater pollution to the environment, oily wastewa...

Claims

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Application Information

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IPC IPC(8): B01D71/62B01D71/34B01D67/00C02F1/40C02F1/44
CPCB01D67/0002B01D71/34B01D71/62B01D2325/36C02F1/40C02F1/44
Inventor 赵军强李冬阳林晶晶王齐齐冯霞赵义平陈莉
Owner TIANJIN POLYTECHNIC UNIV
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