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Polymer membrane with hierarchical porous structure and preparation method and application thereof

A polymer membrane, pore structure technology, applied in chemical instruments and methods, general water supply conservation, water/sludge/sewage treatment, etc., can solve the problems of heat loss, energy loss, aggravated heat conduction and heat radiation loss, etc. Low cost, stable product shape and structure, and high visible light transmittance

Active Publication Date: 2021-09-21
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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  • Polymer membrane with hierarchical porous structure and preparation method and application thereof
  • Polymer membrane with hierarchical porous structure and preparation method and application thereof
  • Polymer membrane with hierarchical porous structure and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0038] Get 4g of polyvinyl alcohol powder and 1g of polyethylene glycol and add it to a 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 place React at 98°C for 1 hour; add 5 mg of silver nitrate crystals into an aqueous solution and add to the above solution, place at 70°C for 12 hours; then pour the solution into a mold to form a film and place it at -20°C for gelation Treatment; the products after gelation were respectively placed in sodium tetraborate solution, ethanol solution, and aqueous solution for cross-linking and selective etching, and finally obtained a polyvinyl alcohol hydrogel film (sample 1), which showed micron and nanometer Level of hierarchical porous structure. The average size of the prepared micropores is 25 μm, and the ave...

Embodiment 2

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

[0046] Take 4g of polyvinyl alcohol powder and 1g of polyethylene oxide and add it to a mixed solution of 50ml of deionized water and glycerol, the mass ratio of the mixed solution is 1:1; place it at 98°C for 1 hour; put 1mg of Silver nitrate crystals were prepared as an aqueous solution and added to the above solution, and placed at 70°C for 12 hours of reaction; 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 Place in sodium tetraborate solution, ethanol solution, and aqueous solution for cross-linking, selective etching, and water absorption treatment, and finally obtain a polyvinyl alcohol hydrogel film (sample 2), which presents a micro- and nano-scale hierarchical porous structure. The average size of the prepared micropores is 5 μm, ...

Embodiment 3

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

[0050] Take 4g of polyvinyl alcohol powder and 1g of polyethylene glycol and add it to a mixed solution of 50ml of deionized water and propylene glycol, the mass ratio of the mixed solution is 1:1, and place it at 98°C for 1 hour; add 1mg of nitric acid The silver crystals are prepared as an aqueous solution and added to the above solution, and placed at 70°C for 12 hours of reaction; then the solution is poured into a mold to form a film and placed at -20°C for gelation treatment; the gelled products are placed successively Cross-linking, selective etching, and water absorption were carried out in sodium tetraborate solution, ethanol solution, and aqueous solution, and finally a polyvinyl alcohol hydrogel film (sample 3) was obtained, which exhibited a hierarchical porous structure of micron and nanometer levels. The average siz...

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Abstract

The invention belongs to the technical field of polymer composite materials, and particularly relates to a polymer film with a hierarchical porous structure and a preparation method and application thereof, and the polymer 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 micron pore structure and a nano pore structure, micron pores are distributed all over the whole polymer membrane, and the pore wall of each micron pore contains nano pores. The obtained polymer film has a hierarchical porous structure, can be used as a polymer-based heat management film, and can perform energy limitation on the surface of a solar evaporator and reduce the loss of heat in the form of heat radiation and heat convection when being used for the solar evaporator.

Description

technical field [0001] 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. Background technique [0002] In recent years, the problem of lack of water resources has become more and more significant. 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% of the water is fresh water, and 87% of this fresh water is located in the polar ice caps and alpine glaciers, which are difficult for humans to use. Solar energy is a clean and renewable energy source. Using solar energy to heat water to generate water vapor, desalinate seawater or treat sewage can obtain clean water resources. [0003] The technology of converting solar energy into heat is a technology ...

Claims

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Application Information

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Patent Type & Authority Applications(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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