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In-situ compatibilization organic-inorganic hybrid membrane and preparation method

An in-situ compatibilizing, hybrid membrane technology, applied in the field of membrane separation, can solve the problems of difficult practical production, complex nanoparticle surface modification process, and increase the cost of membrane preparation, so as to reduce loss, improve mechanical properties and pressure resistance. Real performance and easy control of reaction conditions

Inactive Publication Date: 2017-05-24
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The modification process of nanoparticles will significantly increase the cost of film preparation, and the general surface modification process of nanoparticles is relatively complicated and difficult to be used in actual production

Method used

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  • In-situ compatibilization organic-inorganic hybrid membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Polylactic acid-silica flat plate hybrid film

[0040] Polylactic acid was added to N,N-dimethylacetamide, dissolved at 60°C to obtain a polymer solution, and the surface aminated silica nanoparticles (particle size of 30 nm) were added to N,N-dimethylacetamide. In the amide, disperse uniformly under ultrasonic to obtain inorganic particle dispersion, mix the polymer solution and inorganic particle dispersion, react at 80 °C for 5 minutes, cool to 50 °C, and then add polyethylene glycol (molecular weight 400) as an additive, Fully stirring to obtain the casting liquid.

[0041] In the above composition, the mass fraction of polylactic acid is 15%, the mass fraction of silica is 0.5%, the mass fraction of N,N-dimethylacetamide is 69.5%, and the mass fraction of polyethylene glycol is 15%.

[0042] The casting liquid was scraped on a stainless steel plate, and a 30° C. N,N-dimethylacetamide aqueous solution (concentration of 15%) was used as a coagulation bath...

Embodiment 2

[0044] Example 2: Polylactic acid-silica hollow fiber hybrid membrane

[0045] Polylactic acid was added to dimethyl sulfoxide, then polyethylene glycol (molecular weight 400) was added as an additive, and the polymer solution was obtained by dissolving at 60 °C, and the surface aminated silica nanoparticles (particle size: 30nm) Add into dimethyl sulfoxide, disperse uniformly under ultrasonic to obtain inorganic particle dispersion, mix the polymer solution and inorganic particle dispersion, react at 60°C for 60 minutes, and cool to 30°C to obtain a casting solution.

[0046] In the above composition, the mass fraction of polylactic acid is 15%, the mass fraction of silica is 0.5%, the mass fraction of dimethyl sulfoxide is 69.5%, and the mass fraction of polyethylene glycol is 15%.

[0047] Take N,N-dimethylacetamide aqueous solution (concentration: 15%) at 40°C as the core liquid, N,N-dimethylacetamide aqueous solution (concentration: 5%) at 30°C as the outer coagulation ba...

Embodiment 3

[0049] Example 3: PET-Silica Flat Plate Hybrid Film

[0050] PET was added to N-methylpyrrolidone, dissolved at 90 °C, cooled to 60 °C to obtain a polymer solution, and surface aminated silica nanoparticles (particle size of 10 nm) were added to the polymer solution and ultrasonicated. Disperse uniformly, the temperature rises to 80 ℃ and reacts for 30 minutes, cools to 60 ℃, then adds polyvinylpyrrolidone (K30) as an additive, and fully stirs to obtain a casting liquid.

[0051] In the above composition, the mass fraction of PET is 16%, the mass fraction of silica is 0.01%, the mass fraction of N-methylpyrrolidone is 73.99%, and the mass fraction of polyvinylpyrrolidone is 10%.

[0052] The casting liquid was scraped on a glass plate, and water at 60°C was used as a coagulation bath to obtain a PET-silica flat plate hybrid film.

[0053] The surface contact angle of the modified membrane is 40 degrees, and the water flux at 0.1 MPa is 330 L / h / m 2 .

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Abstract

The invention relates to the field of membrane separation and aims at providing an in-situ compatibilization organic-inorganic hybrid membrane and a preparation method. The hybrid membrane contains inorganic nanoparticles; and the inorganic nanoparticles are connected with a membrane matrix polymer through an N-C covalent bond and uniformly dispersed in the membrane. With amino on the surface, the inorganic nanoparticles react with the membrane matrix polymer under the condition of heating, and the fixation of a polymer chain on nanoparticle surfaces is realized in situ. The method has the characteristics of simplicity in operation, high efficiency and good modifying effect, can improve the filtering efficiency of the membrane and enable the membrane to have special properties such as hydrophilicity, specific adsorbability and catalytic property, and is applicable to the fields such as drinking water treatment, sewage treatment, oil-water separation, seawater desalination, hemodialysis and catalytic separation.

Description

technical field [0001] The invention relates to the field of membrane separation, in particular to a preparation method of an organic-inorganic hybrid membrane. Background technique [0002] Membrane separation technology is a new and efficient separation technology, which has the advantages of small footprint, low energy consumption and high separation efficiency. It is more and more widely used in many fields such as chemical industry, medicine, agriculture and water treatment. [0003] Usually inorganic membranes have the advantages of high strength, good rigidity, high temperature resistance and good chemical stability, but they are brittle, difficult to form, and high cost. The polymer separation membrane has the advantages of good toughness, simple preparation and low cost, but its chemical stability, heat resistance and resistance to organic solvents are poor, and it is prone to compaction under high pressure operation, resulting in a decrease in separation efficiency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/48B01D71/64B01D71/68B01D69/06B01D69/08B01D67/00
CPCB01D71/48B01D67/0002B01D67/0079B01D69/06B01D69/08B01D71/64B01D71/68B01D2325/24
Inventor 王灵辉毛铭欣吴天麟王建华刘望才
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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