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Hydrophilic modified polymer membrane as well as preparation method and application thereof

A hydrophilic modification and polymer technology, which is applied in the field of oil-water separation filter membrane, amphiphilic ion polyelectrolyte modified hydrophilic and pollution-resistant polymer porous membrane, which can solve the problems of unsuitable for industrial application, membrane fouling, high cost, etc. problem, to achieve the effect of oil-water separation flux and anti-pollution performance improvement, simple and controllable preparation process, and low cost

Active Publication Date: 2016-11-23
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problems that restrict the further application of membrane separation technology in the field of oily wastewater treatment are the low separation flux and membrane fouling that need to be solved urgently.
The hydrophilic modification of the membrane is considered to be able to effectively improve the separation flux and oil pollution resistance of the membrane. The water is unstable, and it is easy to lose hydrophilicity and stain resistance during use, so it is not suitable for practical industrial applications

Method used

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  • Hydrophilic modified polymer membrane as well as preparation method and application thereof
  • Hydrophilic modified polymer membrane as well as preparation method and application thereof

Examples

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preparation example Construction

[0032] In a typical implementation case, the preparation method of the polymer hydrophilic modified membrane may include the following steps:

[0033] Ⅰ. The cross-linked hydrophilic copolymer that can be amphiphilic and ionized is prepared by free radical polymerization. The molar ratio of the comonomer dimethylaminoethyl methacrylate to other comonomers is 6:4 to 8:2. The volume ratio of the reaction solvent water and ethanol is 7:3 to 4:6, and the polymerization temperature is 25°C to 60°C;

[0034] II. The post-crosslinked hydrophilic copolymer prepared in step I, which can be amphiphilic and ionized, and polyvinylidene fluoride (including but not limited to polyvinylidene fluoride) according to the mass ratio of 1:4 to 1:1 Proportionally dissolved in a solvent to prepare a casting solution;

[0035] Ⅲ. The casting solution prepared in step Ⅱ is prepared through liquid-induced phase inversion to prepare a porous separation membrane. In the hydrogel bath used for the liqui...

Embodiment 1

[0041] Measure 5.6ml monomer dimethylaminoethyl methacrylate and 2.4ml hydroxyethyl methacrylate, weigh 0.16g sodium sulfate (Na 2 S 2 o 8 ) and 0.16g sodium bisulfite (NaHSO 3 ), dissolved in 40ml of mixed solvent of water and ethanol, the volume of water and ethanol is 1:1, under the condition of 60 ℃, polymerization reaction for 3h, after purification, the cross-linked hydrophilic copolymer that can be amphiphilic and ionized is obtained ;

[0042]Weigh 1g of amphiphilic ionizable post-crosslinked hydrophilic copolymer and 1g of polyvinylidene fluoride, and dissolve them in 10ml of N,N-dimethylformamide containing 4% water by volume at 70°C , be prepared into 20wt% casting liquid, after standing for 12h for defoaming, then scrape the casting liquid evenly onto the surface of clean glass with a film scraper, the edge of the scraper is 200 μm away from the glass surface, and then Immediately immerse in the gel bath for 60min phase inversion, then take it out and put it in...

Embodiment 2

[0044] Measure 6.5ml monomer dimethylaminoethyl methacrylate and 1.8ml hydroxyethyl methacrylate, weigh sodium sulfate 0.16g (Na 2 S 2 o 8 ) and 0.16g sodium bisulfite (NaHSO 3 ), dissolved in 40ml of mixed solvent of water and ethanol, the volume of water and ethanol is 1:1, under the condition of 60 ℃, polymerization reaction for 3h, after purification, the cross-linked hydrophilic copolymer that can be amphiphilic and ionized is obtained ;

[0045] Weigh 1g of amphiphilic ionizable post-crosslinked hydrophilic copolymer and 1g of polyvinylidene fluoride, and dissolve them in 10ml of N,N-dimethylformamide containing 4% water by volume at 70°C , be prepared into 20wt% casting liquid, after standing for 12h for defoaming, then scrape the casting liquid evenly onto the surface of clean glass with a film scraper, the edge of the scraper is 200 μm away from the glass surface, and then Immediately immerse in the gel bath for 60min phase inversion, then take it out and put it i...

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Abstract

The invention discloses a hydrophilic modified polymer membrane. The hydrophilic modified polymer membrane is a flat sheet membrane with a porous structure and is mainly prepared through crosslinking from a polymer matrix and an amphiphilic ionizing and post-crosslinking hydrophilic copolymer, and the diameter of pores in the porous structure is in a range from nanoscale to micro scale. The invention further discloses a preparation method of the hydrophilic modified polymer membrane and an application of the hydrophilic modified polymer membrane as an oil-water separation membrane. Compared with a conventional oil-water separation membrane, the hydrophilic modified polymer membrane has the advantage that the oil-water separation flux and the antipollution property are greatly improved while excellent characteristics of the conventional oil-water separation polymer membrane are maintained; furthermore, the hydrophilic modified polymer membrane has the benefits that a preparation process is simple and controllable, preparation of a uniform and large-area amphiphilic ionic type polyelectrolyte modified porous polymer filter membrane with hydrophilicity, pollution resistance and oil-water separation capacity can be realized, the cost is low, and the hydrophilic modified polymer membrane meets the requirement of industrial production.

Description

technical field [0001] The present invention relates to a method for hydrophilic modification of a polymer membrane, in particular to an amphiphilic ion-type polyelectrolyte modified hydrophilic and pollution-resistant polymer porous membrane, its preparation method and application, such as the use as an oil-water separation filter membrane . Background technique [0002] A large amount of oily wastewater will be produced in petrochemical, textile, non-ferrous metal processing, transportation, energy, power generation and other fields. The traditional oil-water separation process is mainly based on gravity separation, oil-absorbing resin material adsorption, air flotation flocculation, mechanical scraper and other technologies, but its separation operation is complicated, low in efficiency, high in energy consumption, long in time, and has secondary pollution and high cost. Many questions. The process of treating oily wastewater based on membrane separation technology has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/82B01D69/02B01D67/00B01D17/022
Inventor 靳健朱玉长谢伟
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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