Polyurethane/polyvinyl chloride/nano silicon dioxide-carbon nano tube water vapor heat exchange membrane
A nano-silica, polyvinyl chloride technology, applied in membrane, membrane technology, semi-permeable membrane separation and other directions, can solve problems such as poor hydrophilicity
Inactive Publication Date: 2021-03-30
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
Polyvinyl chloride (PVC) is a polymer material with high thermal conductivity and low price, but its hydrophilicity is poor, while polyurethane has strong hydrophilicity and good flexibility. Hybrid energy combines the advantages of both, improves the comprehensive performance of traditional polyurethane materials, obtains a microporous membrane with strong hydrophilicity, high air permeability and good cold and heat exchange performance, and broadens its industrial production and application fields
Method used
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[0022] Preparation of nano-silica-carbon nanotube material: first, carbon nanotubes are added to mixed acid, and refluxed at 100° C. for 12 hours to obtain acidified carbon nanotubes. Then 1g of treated carbon nanotubes were evenly dispersed in a mixed solution of 330ml of ethanol, 49ml of ammonia water and 36ml of deionized water, and 21ml of tetraethyl orthosilicate was quickly added under mechanical stirring, and reacted at room temperature for 3 hours. Repeated washing with deionized water, centrifugation, filtration, and drying at 100° C. for 24 hours to obtain nano-silica-carbon nanotubes.
[0023] Add N,N-dimethylformamide / absolute ethanol to 8 / 2 (80) parts; polyurethane / polyvinyl chloride to 9 / 1 (20) parts; nano-silica-carbon nanotubes to 0.2-0.8 parts In a three-necked flask, stir and mix evenly at 60°C at high speed, and vacuum defoam. Scrape a casting solution with a uniform thickness on a dry and clean glass plate and immediately immerse it in deionized water. Aft...
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The invention relates to a polyurethane / polyvinyl chloride / nano silicon dioxide carbon nanotube water vapor heat exchange membrane, which is prepared by mixing the following components in parts by weight: 10-25 parts of polyurethane (PU) / polyvinyl chloride (PVC) with a ratio of 9 / 1; 75-90 parts of of N,N-dimethylformamide / absolute ethyl alcohol with a ratio of 8 / 2; and 0.2-0.8 part of nano silicondioxide-carbon nano tube. The preparation method of the membrane comprises the following steps of: adding polyurethane, polyvinyl chloride, N,N-dimethylformamide, absolute ethyl alcohol and nano silicon dioxide carbon nanotubes into a three-neck bottle, and continuously conducting stirring until the materials are completely dissolved to obtain a membrane casting solution; after vacuum defoaming,scraping a casting solution with uniform thickness on a dry and clean glass plate, and immediately immersing the glass plate into deionized water; and after the membrane casting solution is subjectedto split-phase membrane forming, cleaning a solvent on the surface of the prepared membrane with clear water, immersing the membrane in a glycerol solution for a period of time and then taking out themembrane for natural airing. The blend membrane has excellent combination characteristics, namely relatively high porosity and moisture absorption rate, and good air permeability and cold and heat exchange performance. The preparation process disclosed by the invention is relatively simple in production process and easy to produce and implement.
Description
technical field [0001] The invention relates to the field of polyurethane membrane production, and relates to the improvement of the permeability of the polyurethane membrane, in particular to a polyurethane / polyvinyl chloride / nano silicon dioxide-carbon nanotube water vapor heat exchange membrane. Background technique [0002] With the increasing energy crisis and people's pursuit of sustainable development of circular economy, how to recover industrial waste heat reasonably is an important part of energy conservation and emission reduction. Polyurethane (PU) is a general term for polymer materials containing repeating urethane (-NHCOO-) segments. It is divided into polyether polyurethane and polyester polyurethane. Among them, polyester polyurethane has excellent mechanical and heat transfer properties. , light fastness and good film-forming performance, good biocompatibility, it has gained more and more attention in the fields of membrane separation, waterproof and moistu...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B01D67/00B01D69/02B01D71/02B01D71/30B01D71/58
CPCB01D67/0079B01D69/02B01D71/021B01D71/027B01D71/30B01D71/58B01D2325/22
Inventor 沈惠玲杨博
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY