A polymer membrane with hierarchical porous structure and its preparation method and application

A technology of polymer membrane and pore structure, applied in chemical instruments and methods, general water supply conservation, water/sludge/sewage treatment, etc. High visible light transmittance, low cost, stable product shape and structure

Active Publication Date: 2022-06-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the evaporator with interface heating, it concentrates a large amount of heat energy at the interface, and this heating layer with a higher temperature will generate a large amount of heat radiation, resulting in energy loss; at the same time, because it will directly contact the air, Heat convection occurs with the air, resulting in heat loss
Although interface evaporation can reduce the heat loss caused by the separation of the heating surface and the evaporation surface, it also aggravates the loss caused by heat conduction and heat radiation

Method used

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  • A polymer membrane with hierarchical porous structure and its preparation method and application
  • A polymer membrane with hierarchical porous structure and its preparation method and application
  • A polymer membrane with hierarchical porous structure and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A polyvinyl alcohol hydrogel film with a hierarchical porous structure, the preparation of which is carried out according to the following steps:

[0038] Get 4g of polyvinyl alcohol powder and 1g of polyethylene glycol and add it to the mixed solution of 50ml of deionized water and glycerol (the mass ratio of water and glycerol in the mixed solution is 1:1), and then placed in React at 98 °C for 1 h; then add 5 mg of silver nitrate crystals into an aqueous solution and add it to the above solution, and place it at 70 °C to react for 12 h; then pour the solution into a mold to form a film and place it at -20 °C for gelation Treatment; the gelled products were successively placed in sodium tetraborate solution, ethanol solution, and aqueous solution for cross-linking and selective etching, and finally a polyvinyl alcohol hydrogel film (sample 1) was obtained, which showed micro and nano grades of hierarchical porous structures. The prepared micropores have an average si...

Embodiment 2

[0045] A polyvinyl alcohol hydrogel film with a hierarchical porous structure, the preparation of which is carried out according to the following steps:

[0046] Take 4g of polyvinyl alcohol powder and 1g of polyethylene oxide and add it to 50ml of mixed solution of deionized water and glycerol, the mass ratio of the mixed solution is 1:1; put it at 98 ℃ to react for 1h; put 1mg of Silver nitrate crystals were prepared as an aqueous solution and added to the above solution, and then placed at 70 °C for 12 h; then the solution was poured into a mold to form a film and placed at -20 °C for gelation treatment; the gelled products were successively Placed in sodium tetraborate solution, ethanol solution, and aqueous solution for cross-linking, selective etching, and water absorption treatment, and finally a polyvinyl alcohol hydrogel film (sample 2) was obtained, which presented a micro- and nano-scale hierarchical porous structure. The prepared micropores have an average size of ...

Embodiment 3

[0049] A polyvinyl alcohol hydrogel film with a hierarchical porous structure, the preparation of which is carried out according to the following steps:

[0050] Take 4g of polyvinyl alcohol powder and 1g of polyethylene glycol and add it to 50ml of mixed solution of deionized water and propylene glycol, the mass ratio of the mixed solution is 1:1, put it at 98 ℃ to react for 1h; add 1mg of nitric acid The silver crystal was added into the above solution as an aqueous solution, and was placed at 70 °C for 12 h; then the solution was poured into a mold to form a film and placed at -20 °C for gelation treatment; the gelled products were placed in succession In sodium tetraborate solution, ethanol solution, and aqueous solution, cross-linking, selective etching, and water absorption treatment are performed to finally obtain a polyvinyl alcohol hydrogel film (sample 3), which exhibits a micro- and nano-scale hierarchical porous structure. The prepared micropores have an average si...

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Abstract

The invention belongs to the technical field of polymer composite materials, and in particular relates to a polymer film with hierarchical porous structure and its preparation method and application. The film can be used as a surface heat management film of a solar evaporator. The invention provides a polymer membrane, the polymer membrane has a micropore structure and a nanopore structure, the micropores are distributed throughout the polymer membrane, and the walls of the micropores contain nanopores. The polymer film obtained in the present invention has a hierarchical porous structure, and the film can be used as a polymer-based thermal management film. When used in a solar evaporator, it can limit the energy on the surface of the solar evaporator, and reduce heat through thermal radiation and heat convection. Loss.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a polymer film with a hierarchical porous structure, a preparation method and application thereof, and the film can be used as a surface heat management film of a solar evaporator. Background technique [0002] In recent years, the shortage of water resources has become more and more obvious. By 2030, people's demand for fresh water will reach 6.9 trillion cubic meters per year. Although 70% of the earth's surface is covered by water, only 2.5% is freshwater, and 87% of this freshwater is located in polar ice caps and alpine glaciers, making it difficult for humans to use it. Solar energy is a clean and renewable energy source. Using solar energy to heat water to generate steam, desalinate seawater or treat sewage, clean water resources can be obtained. [0003] The technology of solar energy conversion to heat energy is a technology that directly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/26C08L29/04C08L33/26C08K3/08C02F1/14C02F1/04C02F103/08
CPCC08J9/26C08J9/0071C02F1/14C02F1/043C08J2329/04C08J2333/26C08K2201/011C08K2003/0806C08J2201/046C02F2103/08Y02A20/212
Inventor 杨伟孟森查湘军包睿莹柯凯刘正英杨鸣波
Owner SICHUAN UNIV
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