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Preparation method and application of hydrogel/PVDF (Polyvinylidene Fluoride) composite oil-water separation membrane

An oil-water separation membrane, hydrogel technology, applied in water/sludge/sewage treatment, osmotic/dialysis water/sewage treatment, semi-permeable membrane separation, etc. The effect of arbitrary production, good separation ability, and cheap and easy-to-obtain raw materials

Active Publication Date: 2022-03-18
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art, the present invention solves the problem that the service life of the current oil-water separation membrane is not long, and utilizes hyperbranched polymers and sodium lignosulfonate as excellent Hydrophilic gel pre-polymerization fluid is formed due to its water solubility, and graft cross-linking polymerization is applied on the treated PVDF membrane surface to form a hydrogel / PVDF composite membrane, and the preparation method of the present invention is simple

Method used

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preparation example Construction

[0020] A kind of preparation of aminated sodium lignosulfonate, comprising:

[0021] c1, dissolve 20g of sodium sulfonate in 150mL of water, add 30g of diethylenetriamine, and stir until dissolved;

[0022] c2 using 0.1M sodium hydroxide solution and 0.1M hydrogen chloride solution to adjust the pH of the solution to 10-15;

[0023] c3, transfer the pH-adjusted solution to the reaction flask, and add 20 g of formaldehyde solution dropwise, and complete the dropwise addition within 30 minutes;

[0024] c4, heating the solution obtained in c3 to 50° C. for 4 hours, and then pouring the reacted solution into isopropanol or n-butanol to precipitate a precipitate;

[0025] c5, suck out the supernatant of c4, and suction filter the remaining solution to obtain a solid precipitate, then wash the solid precipitate with isopropanol or n-butanol, and vacuum dry at 40°C after suction filtration to obtain a solid powder, which is aminated lignin Sulfonate. The molecular weight of the p...

Embodiment 1

[0032] A hydrogel / PVDF composite oil-water separation membrane, comprising the steps of:

[0033] Step 1, the pretreatment of PVDF film, comprises the following steps:

[0034] a1, soaking the PVDF membrane in ethanol and deionized water successively for cleaning; the PVDF membrane adopts a commercially available PVDF membrane with a pore size of 0.22 μm;

[0035] a2, at room temperature, immerse the PVDF membrane in 3.0mol / L sodium hydroxide for 8 hours to remove HF from the PVDF membrane to generate double bonds and hydroxyl groups, and then wash with deionized water until neutral;

[0036] a3. Soak the membrane after alkali treatment into 50mL of 5% glycidyl methacrylate solution, and bubble with nitrogen for 15min, then add 1.0g sodium bisulfite and 1.0g ammonium persulfate, and stir at 60°C for reaction 6h;

[0037] a4, the diaphragm is taken out after the reaction, and the surface of the diaphragm is rinsed with deionized water to wash off the unreacted glycidyl methac...

Embodiment 2

[0043] A hydrogel / PVDF composite oil-water separation membrane, comprising the steps of:

[0044] Step 1, the pretreatment of PVDF film, comprises the following steps:

[0045] a1, soaking the PVDF membrane in ethanol and deionized water successively for cleaning; the PVDF membrane adopts a commercially available PVDF membrane with a pore size of 0.22 μm;

[0046] a2, at room temperature, immerse the PVDF membrane in 3.0mol / L sodium hydroxide for 8 hours to remove HF from the PVDF membrane to generate double bonds and hydroxyl groups, and then wash with deionized water until neutral;

[0047] a3. Soak the membrane after alkali treatment into 50mL of 5% glycidyl methacrylate solution, and bubble with nitrogen for 15min, then add 1.0g sodium bisulfite and 1.0g ammonium persulfate, and stir at 60°C for reaction 6h;

[0048] a4, the diaphragm is taken out after the reaction, and the surface of the diaphragm is rinsed with deionized water to wash off the unreacted glycidyl methac...

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Abstract

The invention belongs to the technical field of oil-water separation, and particularly relates to a preparation method of a hydrogel / PVDF (Polyvinylidene Fluoride) composite oil-water separation membrane, which comprises the following steps: step 1, carrying out alkalization treatment on a PVDF membrane, and grafting glycidyl methacrylate; the preparation method comprises the following steps: step 1, uniformly mixing and stirring aminated sodium lignin sulfonate, hyperbranched polyamide and a cross-linking agent polyethylene glycol diglycidyl ether in deionized water to obtain a gel pre-polymerization solution, and step 2, uniformly smearing the hydrogel pre-polymerization solution on the surface of a treated PVDF membrane, and drying the PVDF membrane in an oven at 70 DEG C for 5-10 minutes for cross-linking to form the hydrogel / PVDF composite membrane. The problem that an existing oil-water separation membrane is short in service life is solved, hydrophilic gel pre-polymerization liquid is formed by means of excellent water solubility of the hyperbranched polymer and sodium lignin sulfonate, and the hydrogel / PVDF composite membrane is formed by coating, grafting, cross-linking and polymerizing the surface of the treated PVDF membrane.

Description

technical field [0001] The invention belongs to the technical field of oil-water separation, and in particular relates to a preparation method and application of a hydrogel / PVDF composite oil-water separation membrane. Background technique [0002] With the development of society, the discharge of industrial waste water and the leakage of offshore crude oil produce a large amount of oil-water mixture, which has brought great challenges to human health and the environment. Therefore, the ability to effectively separate oil-water mixtures is of great significance for sustainable development. Traditional oil removal methods include centrifugal method, electric field method, coagulation method, flocculation method, biological treatment method, etc., but these methods have disadvantages such as low separation efficiency, complicated operation, and high cost. In recent years, using the hydrophilic and oleophobic properties of functionalized materials to achieve high-efficiency se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D69/12B01D71/34B01D71/56B01D71/78B01D67/00C02F1/44C08J7/16C08J7/056C09D171/02C09D177/00C09D197/00C08L27/16C02F101/32
CPCB01D71/34B01D69/125B01D71/78B01D71/56B01D69/02C02F1/44C08J7/16C08J7/056B01D2325/36C02F2101/32C08J2327/16C08J2497/00C08J2477/00C08J2471/02
Inventor 田妮妮李瑞超倪华钢戴志锋
Owner ZHEJIANG SCI-TECH UNIV
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