Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method for preparing a total heat exchange membrane by growing zifs nanoparticles in situ and the prepared membrane

A technology of total heat exchange membrane and nanoparticles, which is applied in the field of preparing total heat exchange membranes and the prepared membranes by growing ZIFs nanoparticles in situ, achieving good moisture permeability and gas barrier performance, easy synthesis method and preparation conditions, and easy solution The effect of reunion

Active Publication Date: 2022-05-17
ZHEJIANG UNIV OF TECH
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the moisture permeability and gas barrier performance of the total heat exchange membrane is the focus of its research, but both of them involve the permeation of gas, and they are contradictory.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing a total heat exchange membrane by growing zifs nanoparticles in situ and the prepared membrane
  • A method for preparing a total heat exchange membrane by growing zifs nanoparticles in situ and the prepared membrane
  • A method for preparing a total heat exchange membrane by growing zifs nanoparticles in situ and the prepared membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] To prepare a total heat exchange membrane material containing ZIF-8 nanoparticles, the specific steps are as follows:

[0030] Dissolve 6g of polyvinyl alcohol (PVA, type 1799) in 94g of deionized water to prepare a 6wt% PVA aqueous solution, stir and dissolve in a water bath at a constant temperature of 80°C to obtain a basic casting solution;

[0031] Take 1.32g of 2-methylimidazole and dissolve it in a 50g PVA aqueous solution, and name it A solution;

[0032] Take 0.95g of zinc nitrate hexahydrate and dissolve it in another PVA aqueous solution, and name it B solution;

[0033] Add solution B to solution A drop by drop, at 20°C, stir for 5 minutes and react for 5 hours to prepare a casting solution; place the casting solution ultrasonically for defoaming, and use polysulfone ultrafiltration membrane as the bottom in a glass plate frame The film was cast to form a film, the film forming temperature was 30°C, and the film forming time was 24h.

Embodiment 2

[0035] The method of embodiment 2a-2d is identical with embodiment 1, and difference is that polyvinyl alcohol (PVA, 1799 type) consumption is respectively 4.01g (embodiment 2a), 5.02g (embodiment 2b), 7.00g (embodiment 2b) 2c), 8.01g (embodiment 2d), the concentration of crosslinking agent polyvinyl alcohol is adjusted. It was found that as the concentration of polyvinyl alcohol increased to remain constant, the water vapor transmission rate of the total heat exchange membrane gradually decreased, but the gas barrier property of the membrane gradually increased.

Embodiment 3

[0037] To prepare a total heat exchange membrane material containing ZIF-7 nanoparticles, the specific steps are as follows:

[0038] Dissolve 9g of polyvinyl alcohol (PVA, type 1799) in 141g of deionized water to prepare a 6wt% PVA aqueous solution, stir and dissolve in a water bath at a constant temperature of 80°C to obtain a basic casting solution;

[0039] Take 0.375g of benzimidazole and dissolve it in 75g of PVA aqueous solution, and name it as solution A;

[0040] Zinc nitrate hexahydrate 1.425g was dissolved in another 75g PVA aqueous solution, and named as solution B;

[0041] Add solution B to solution A drop by drop, at 20°C, stir for 5 minutes and react for 5 hours to prepare a casting solution; place the casting solution ultrasonically for defoaming, and use polysulfone ultrafiltration membrane as the bottom in a glass plate frame The film was cast to form a film, the film forming temperature was 30°C, and the film forming time was 24h.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for preparing a total heat exchange membrane by in-situ growth of ZIFs nanoparticles and the prepared membrane, using deionized water as a solvent, adding polyvinyl alcohol as a cross-linking agent to prepare a basic casting liquid, and mixing it Divide into two equally; take the imidazole ligand and zinc nitrate hexahydrate and dissolve them in the above two solutions respectively and name them A and B; mix polyvinyl alcohol with the imidazole ligand, zinc nitrate hexahydrate, and deionized water Forming a casting solution; reacting the A solution and the B solution in the casting solution by a solvent method, growing ZIFs nanoparticles in situ, and preparing a casting solution containing ZIFs nanoparticles; passing the obtained casting solution through ultrasonic , After standing for defoaming, cast it on the support layer pressed by the plate frame to dry. The present invention can effectively reduce the agglomeration phenomenon of nano particles through in-situ growth, and uniformly disperse them in the functional layer. The prepared film has high gas barrier and moisture permeability performance and total heat exchange performance, and has excellent stability at the same time.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a method for preparing a total heat exchange membrane by growing ZIFs nano particles in situ and the prepared membrane. Background technique [0002] The total heat exchange membrane, that is, the air energy recovery membrane, as the medium of the total heat exchanger, can effectively recover sensible heat and latent heat. We all know that the latent heat of vaporization of water vapor in the air is very high, so the proportion of energy in humid air is relatively large. Therefore, the latent heat contribution rate of the total heat exchange of indoor and outdoor air is far greater than the sensible heat contribution rate, which seriously affects the energy efficiency ratio of the system. Therefore, in order to improve the energy recovery efficiency of the total heat exchanger, increasing the water vapor transmission rate of the total heat exchange membrane is impo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D69/02B01D69/10
CPCB01D67/0079B01D69/02B01D69/10B01D2325/22Y02C20/40
Inventor 薛立新李士洋苌现张秀敏
Owner ZHEJIANG UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com