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Method for preparing organic-inorganic hybrid total heat exchange membrane through sol-gel method

A technology of total heat exchange membrane and sol-gel method, which is applied in the field of preparing organic-inorganic hybrid total heat exchange membrane, and can solve the problem of inability to effectively isolate harmful gases and bacteria, secondary pollution of indoor air, ineffective ventilation, etc. problems, to achieve the effect of facilitating large-scale development and production, increasing interaction, and promoting dispersion

Active Publication Date: 2016-06-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the popularity of total heat exchangers, the shortcomings of this membrane are gradually exposed.
First of all, it is a fully permeable membrane, which cannot effectively isolate harmful gases and germs, which will cause these pollutants to flow back to the fresh air, thus preventing effective ventilation
Secondly, the paper film is prone to mildew during the process of moisture permeability
This will not only affect the service life, but also cause secondary pollution to the indoor air
In addition, the paper film is not flame retardant, which will cause safety hazards

Method used

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  • Method for preparing organic-inorganic hybrid total heat exchange membrane through sol-gel method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 5 g of cellulose acetate (degree of esterification 280-300, acetyl content 42.5%-44.8%) in 95 g of acetic acid, dissolve at 55°C for 3 h, let stand for defoaming, and obtain a uniform and transparent cellulose acetate solution.

[0019] Add 1g of aluminum isopropoxide to the cellulose acetate solution, add 2 drops of hydrochloric acid, and stir at 95°C for 2 hours to fully hydrolyze and polycondense the precursor to form nano-sized particles, and then reflux in a constant temperature water bath for 8 hours to make the nano-particles The particles are uniformly dispersed in the cellulose acetate forming solution.

[0020] The prepared organic-inorganic hybrid casting solution was subjected to vacuum defoaming, and flow-casted on a glass plate, with a wet film thickness of 150 μm. Then put the film into a vacuum oven at 60°C and dry for 3 hours. Finally, peel off the film and leave it at room temperature for 24 hours to test its performance.

[0021] The water ...

Embodiment 2

[0023] Dissolve 4g of cellulose acetate (degree of esterification 240-260, acetyl content 39.5-41.5) in 96g of acetone-methanol mixed solution, the volume ratio of the solvent is 1:1, stir at 70°C for 4 hours, let it stand for defoaming , to obtain a transparent and stable casting solution.

[0024] Add 2g of butyl titanate to the cellulose acetate solution, add 3 drops of hydrochloric acid, and stir at 60°C for 3 hours to fully hydrolyze and polycondense the precursor to form nano-sized particles, and then reflux in a constant temperature water bath for 10 hours to make the nano-particles The particles are uniformly dispersed in the cellulose acetate forming solution.

[0025] The prepared organic-inorganic hybrid casting solution was subjected to vacuum defoaming, and flow-casted on a glass plate, with a wet film thickness of 200 μm. Then put the film into a vacuum oven at 50°C and dry it for 4 hours. Finally, peel off the film and leave it at room temperature for 24 hours...

Embodiment 3

[0028] Dissolve 7g of cellulose acetate (degree of esterification 230-240, acetyl content 38.0-39.5) in 93g of acetone solution, stir at 75°C for 2 hours, let stand for defoaming, and obtain a transparent and stable casting solution.

[0029] Add 4g tetraethyl orthosilicate to the prepared cellulose acetate solution, add 2 drops of 2mol / L sodium hydroxide solution, stir at 50°C for 3h, fully hydrolyze and polycondense the precursor to form nano-sized particles, and then keep the temperature The water bath was refluxed for 12 hours, so that the nanoparticles were uniformly dispersed in the solution for forming cellulose acetate.

[0030] The prepared organic-inorganic hybrid casting solution was subjected to vacuum defoaming, and flow-casted on a glass plate, with a wet film thickness of 300 μm. Then put the film into a vacuum oven at 60°C and dry for 3 hours. Finally, peel off the film and leave it at room temperature for 24 hours to test its performance.

[0031] The novel ...

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Abstract

The invention discloses a method for preparing an organic-inorganic hybrid total heat exchange membrane through a sol-gel method. The method includes the steps that an inorganic matter precursor and an organic high polymer are evenly mixed in a co-solvent, solation and gelation are conducted, and the organic-inorganic hybrid membrane is prepared. In a polymer system, nanoscale particles are obtained after hydrolytic polycondensation and evenly scattered in the polymer solution system. The preparation process is low in synthesis temperature, preparation cost is low, the pore diameter distribution is even, the agglomeration behavior of inorganic nano-particles can be effectively restrained, dispersity of the inorganic nano-particles in a polymer matrix is promoted, interaction between an organic phase and an inorganic phase is improved, the stability of the inorganic nano-particles in the polymer matrix is improved, and multiple properties such as moisture penetrability, gas blocking, pollution resistance and bacterium resistance of the separation membrane can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a method for preparing an organic-inorganic hybrid total heat exchange membrane by a sol-gel method. technical background [0002] Today, air conditioners have entered thousands of households and become a necessity in our lives. However, due to the airtightness of the space caused by the use of air conditioners, many people suffer from "air conditioner disease", and more and more people pay attention to indoor air quality. On the other hand, according to survey statistics, industry, construction, and transportation are the three main parts of energy consumption. The energy directly consumed by buildings in the process of construction and use is close to 1 / 3 of the total energy consumption of society, and the energy consumption of heating and air conditioning Accounted for about 65%. In order to solve these problems, more and more people are committed to ...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D69/02B01D67/00
CPCB01D67/0079B01D69/02B01D71/16B01D2325/36B01D2325/48
Inventor 王艺伟韩秋周青波杨晴薛丽青盛建芳薛立新
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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