Self-supporting high-molecular polymer membrane as well as preparation method and application thereof

A high molecular polymer and polymer membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve difficult large-scale preparation, output power density needs to be further improved, porous material preparation method and process complex problems, to achieve the effect of simple and easy method and process, high energy conversion efficiency and low cost

Active Publication Date: 2021-10-26
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the work reported so far, the preparation methods and processes of porous materials are complicated, it is difficult to achieve large-scale preparation, and the highest output power density needs to be further improved

Method used

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  • Self-supporting high-molecular polymer membrane as well as preparation method and application thereof
  • Self-supporting high-molecular polymer membrane as well as preparation method and application thereof

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preparation example Construction

[0026] The present invention also includes the preparation method of any one of the above-mentioned high-efficiency salinity difference power generation polymer membranes, comprising the following steps:

[0027] 1) Add Kevlar fibrils and potassium hydroxide into a container containing dimethyl sulfoxide in parts by weight, and stir for 7 days at a rotating speed of 200-500r / min;

[0028] 2) placing the aramid nanofiber dispersion formed by stirring, and the high molecular polymer in a container filled with dimethyl sulfoxide solvent, and stirring at a speed of 200-500r / min for 3-5h;

[0029] 3) The dispersion liquid stirred in 2) is vacuum-filtered for 2-72 hours, and finally dried at 40-80° C. for 2-5 hours and peeled off to obtain a high-molecular polymer membrane for salt difference power generation.

[0030] The present invention also provides the application of any one of the above polymer membranes in salinity difference power generation.

Embodiment 1

[0033] The preparation method of ANFs-SL and the application of salinity difference power generation comprise the following steps:

[0034] 1) Put 11 mg of Kevlar 29 fibrils and 9 mg of potassium hydroxide into a beaker filled with 20 mL of dimethyl sulfoxide solvent, and stir at a speed of 250 r / min for 7 days to form an aramid nanofiber dispersion.

[0035]2) Put the aramid nanofiber dispersion prepared in 1) and 80 mg SL in a beaker, stir at a stirring speed of 350 r / min for 4 hours to obtain a uniform mixed liquid.

[0036] 3) The mixed solution obtained in step 2) is subjected to vacuum suction filtration, at room temperature, suction filtration for 6 hours, and dried at 40° C. for 2 hours to peel off to obtain an ANFs-SL film with a film thickness of about 32 μm; the ANFs- The SL film material is a two-dimensional layered structure, and the percentage content of SL is 79.6wt%.

[0037] 4) Salt difference power generation performance test: ANFs-SL membrane is used to sep...

Embodiment 2

[0039] The preparation method of ANFs-PSS and the application of salinity difference power generation comprise the following steps:

[0040] 1) Put 45 mg of Kevlar 49 fibrils and 9 mg of potassium hydroxide into a beaker filled with 100 mL of dimethyl sulfoxide solvent, and stir at a speed of 300 r / min for 7 days to form an aramid nanofiber dispersion.

[0041] 2) Put the aramid nanofiber dispersion prepared in 1) and 50 mg of PSS in a beaker, stir at a stirring speed of 300 r / min for 2 hours to obtain a uniform mixed liquid.

[0042] 3) The mixed solution obtained in step 2) is subjected to vacuum suction filtration, at room temperature, suction filtration for 12 hours, and dried at 60° C. for 4 hours to peel off to obtain an ANFs-PSS film with a film thickness of about 11 μm; the ANFs- The PSS film material is a two-dimensional layered structure, wherein the percentage content of PSS is 50.2wt%.

[0043] 4) Salt difference power generation performance test: ANFs-PSS membran...

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Abstract

The invention discloses a self-supporting high-molecular polymer membrane as well as a preparation method and application thereof. The polymer membrane is prepared by taking aramid nano-fibers as a connector, blending and doping a high-molecular polymer with the aramid nano-fibers, and performing suction filtration, and based on the total mass of the membrane, the mass percentage of the high-molecular polymer in the polymer membrane is 45.6 wt%-92.3 wt%. The method comprises the following steps of putting Kevlar fibril and potassium hydroxide into a container filled with a dimethyl sulfoxide solvent, and stirring to form an aramid nano-fiber dispersion liquid, adding the aramid nano-fiber dispersion liquid and a high-molecular polymer into a container, and stirring, and carrying out vacuum filtration treatment on the uniformly stirred dispersion liquid, and finally drying and stripping to obtain the salinity gradient power generation high-molecular polymer membrane. The required high-molecular polymer membrane is obtained by adopting a vacuum filtration method, the method and the process are simple and easy to implement, the cost is low, and large-scale preparation can be realized; and the prepared high-molecular polymer membrane is high in energy conversion efficiency and has certain commercial application value.

Description

technical field [0001] The invention belongs to the field of salinity difference power generation, and in particular relates to a self-supporting high molecular polymer film and its preparation method and application; it is used for high-efficiency salt difference power generation. Background technique [0002] At present, the development and utilization of blue ocean energy / economy has become a key link in the implementation of sustainable development strategies for countries around the world. In addition to the well-known blue energy such as offshore wind energy and tidal energy, due to the significant difference in salinity between seawater and freshwater at river estuaries, there are salinity energy such as osmotic pressure, dilution / absorption heat, and salinity potential difference at the interface between the two. , is another typical marine green and clean new energy with huge connotations. The data shows that due to the significant difference in salinity between se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/10B01D71/72
CPCB01D71/72B01D71/10B01D67/0002Y02E10/30
Inventor 朱英李世英
Owner BEIHANG UNIV
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