Blended low-thermal-conductivity film containing nanoscale low-thermal-conductivity material and high polymer as well as preparation method and application of blended low-thermal-conductivity film

A high-polymer film, low thermal conductivity technology, applied in chemical instruments and methods, film, film technology and other directions, can solve the problems of increasing the complexity of film components and equipment, high cost of aerogel materials, limited improvement, etc. The effect of increasing flux and heat utilization, improving structural performance, and reducing heat loss

Active Publication Date: 2021-07-13
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although membrane distillation can effectively utilize cheap heat sources, its thermal efficiency is far lower than other thermal concentration processes. Therefore, improving the thermal efficiency of membrane distillation has long-term significance for reducing energy consumption of membrane distillation and promoting the industrialization of membrane distillation.
Patent CN200410037319 discloses a method for improving the membrane distillation process while increasing mem

Method used

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  • Blended low-thermal-conductivity film containing nanoscale low-thermal-conductivity material and high polymer as well as preparation method and application of blended low-thermal-conductivity film
  • Blended low-thermal-conductivity film containing nanoscale low-thermal-conductivity material and high polymer as well as preparation method and application of blended low-thermal-conductivity film
  • Blended low-thermal-conductivity film containing nanoscale low-thermal-conductivity material and high polymer as well as preparation method and application of blended low-thermal-conductivity film

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Example 1

[0034] (1) The mass fraction of polyvinylidene ethylene is 12 wt.%, The mass fraction of the nano-aluminum aluminum has a mass fraction of 2 wt.%, Solvent DMAC82WT.%, Additive LiCl 3 wt.%, Acetone 1 wt.%;

[0035] (2) Add a mixed raw material weighing step (1) to the reactor, electrically stirring at a constant temperature water bath at 60 ° C for about 12 h, forms uniform and stable cast film fluid, standing at room temperature for 12 h, resulting in all phase casting Membrane;

[0036] (3) The resulting cast film solution obtained by the wiper is scrape the liquid film of 150 μm on the nonwoven fabric, first immersed in the gel bath ethanol solution for 5 minutes, and after the phase separation is taken out, it is flushed with deionized water;

[0037](4) The film obtained by step (3) is transferred to the deionized water soaking 24 h, allowing the solvent to be completely extracted, i.e., the polyvinylidene fluoride / nano-aluminum aluminum aluminum is blende...

Example Embodiment

[0039] Example 2

[0040] (1) The mass fraction of polyvinylidene ethylene is 12 wt.%, The mass fraction of the nano-aluminum aluminum is 4 wt.%, Solvent DMAC80 wt.%, Additive LiCl 3 wt.%, Acetone 1 wt.%;

[0041] (2) Add a mixed raw material weighing step (1) to the reactor, electrically stirring at a constant temperature water bath at 60 ° C for about 12 h, forms uniform and stable cast film fluid, standing at room temperature for 12 h, resulting in all phase casting Membrane;

[0042] (3) The resulting cast film solution obtained by the wiper is scrape the liquid film of 150 μm on the nonwoven fabric, first immersed in the gel bath ethanol solution for 5 minutes, and after the phase separation is taken out, it is flushed with deionized water;

[0043] (4) The film obtained by step (3) is transferred to the deionized water soaking 24 h, allowing the solvent to be completely extracted, i.e., the polyvinylidene fluoride / nano-aluminum aluminum aluminum is blended with the present...

Example Embodiment

[0045] Example 3

[0046] (1) The mass fraction of polyvinylidene ethylene is 12 wt.%, The mass fraction of the nano-polyphenylene powder particles is 2 wt.%, Solvent DMAC 82 wt.%, Additive LiCl 3 wt.%, Acetone 1 wt.%;

[0047] (2) Add a mixed raw material weighing step (1) to the reactor, electrically stirring at a constant temperature water bath at 60 ° C for about 12 h, forms uniform and stable cast film fluid, standing at room temperature for 12 h, resulting in all phase casting Membrane;

[0048] (3) The resulting cast film solution obtained by the wiper is scrape the liquid film of 150 μm on the nonwoven fabric, first immersed in the gel bath ethanol solution for 5 minutes, and after the phase separation is taken out, it is flushed with deionized water;

[0049] (4) The film obtained by step (3) is transferred to the deionized water soaking 24 h, so that the solvent is completely extracted, i.e., the polyvinylidene fluoride / polyphenylene powder particles of the present inv...

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Abstract

The invention discloses a blended low-thermal-conductivity film containing a nanoscale low-thermal-conductivity material and a high polymer as well as a preparation method and application of the blended low-thermal-conductivity film, wherein the blended low-thermal-conductivity film takes a hydrophobic or hydrophobically modified high polymer material as a main body, and the nanoscale low-thermal-conductivity material is added; based on the mass percentage, the nano-scale low-thermal-conductivity material accounts for 0-10% of the blended low-thermal-conductivity film and is not 0, the pore size distribution of the blended low-thermal-conductivity film is narrow and uniform, the pore size is 0.3 [mu]m-0.5 [mu]m, and the porosity is 30%-80%. By adding the nanoscale low-thermal-conductivity material into the film for film distillation and utilizing the unique performance of the nanoscale low-thermal-conductivity material, the flux and the heat utilization rate of the film distillation and related film processes are greatly improved. The prepared film has the advantages of uniform pore size distribution, excellent air permeability, stable operation and low thermal conductivity, is especially suitable for the film distillation process, increases the temperature difference and vapor pressure difference of the two sides of the film, improves the mass transfer efficiency, reduces the MD heat loss, improves the thermal efficiency of the film distillation process, and optimizes the mass transfer efficiency.

Description

technical field [0001] The invention belongs to the technical field of polymer material science and membrane separation, and relates to material separation, concentration, purification and other technologies, in particular to a blended low thermal conductivity film containing nano-scale low thermal conductivity materials and high polymers and its preparation method and application. Background technique [0002] Due to the increasing demand for fresh water around the world, membrane distillation (Membrane Distillation, referred to as MD) has attracted widespread attention of researchers. MD theoretically has a retention rate of up to 100%. It is an efficient membrane separation technology that can effectively utilize cheap energy such as solar energy, geothermal energy, industrial waste heat, and seawater waste heat. The operating pressure is much lower than membrane separation such as nanofiltration and reverse osmosis. process, the separation mechanism allows only volatile ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D69/02B01D67/00B01D71/10B01D71/26B01D71/52B01D71/56B01D71/68B01D61/36C02F1/44C02F1/04
CPCB01D71/34B01D69/02B01D67/0079B01D71/10B01D71/26B01D71/68B01D71/56B01D71/52B01D61/364C02F1/447C02F1/04B01D2325/22Y02W10/37
Inventor 唐娜陈乃麟项军田桂英程鹏高张蕾王松博杜威张建平
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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